drivers/target/target_core_transport.c

   1 /*******************************************************************************
   2  * Filename:  target_core_transport.c
   3  *
   4  * This file contains the Generic Target Engine Core.
   5  *
   6  * (c) Copyright 2002-2013 Datera, Inc.
   7  *
   8  * Nicholas A. Bellinger <nab@kernel.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  *
  24  ******************************************************************************/
  25
  26 #include <linux/net.h>
  27 #include <linux/delay.h>
  28 #include <linux/string.h>
  29 #include <linux/timer.h>
  30 #include <linux/slab.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/kthread.h>
  33 #include <linux/in.h>
  34 #include <linux/cdrom.h>
  35 #include <linux/module.h>
  36 #include <linux/ratelimit.h>
  37 #include <asm/unaligned.h>
  38 #include <net/sock.h>
  39 #include <net/tcp.h>
  40 #include <scsi/scsi.h>
  41 #include <scsi/scsi_cmnd.h>
  42 #include <scsi/scsi_tcq.h>
  43
  44 #include <target/target_core_base.h>
  45 #include <target/target_core_backend.h>
  46 #include <target/target_core_fabric.h>
  47 #include <target/target_core_configfs.h>
  48
  49 #include "target_core_internal.h"
  50 #include "target_core_alua.h"
  51 #include "target_core_pr.h"
  52 #include "target_core_ua.h"
  53
  54 #define CREATE_TRACE_POINTS
  55 #include <trace/events/target.h>
  56
  57 static struct workqueue_struct *target_completion_wq;
  58 static struct kmem_cache *se_sess_cache;
  59 struct kmem_cache *se_ua_cache;
  60 struct kmem_cache *t10_pr_reg_cache;
  61 struct kmem_cache *t10_alua_lu_gp_cache;
  62 struct kmem_cache *t10_alua_lu_gp_mem_cache;
  63 struct kmem_cache *t10_alua_tg_pt_gp_cache;
  64 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
  65 struct kmem_cache *t10_alua_lba_map_cache;
  66 struct kmem_cache *t10_alua_lba_map_mem_cache;
  67
  68 static void transport_complete_task_attr(struct se_cmd *cmd);
  69 static void transport_handle_queue_full(struct se_cmd *cmd,
  70                 struct se_device *dev);
  71 static int transport_put_cmd(struct se_cmd *cmd);
  72 static void target_complete_ok_work(struct work_struct *work);
  73
  74 int init_se_kmem_caches(void)
  75 {
  76         se_sess_cache = kmem_cache_create("se_sess_cache",
  77                         sizeof(struct se_session), __alignof__(struct se_session),
  78                         0, NULL);
  79         if (!se_sess_cache) {
  80                 pr_err("kmem_cache_create() for struct se_session"
  81                                 " failed\n");
  82                 goto out;
  83         }
  84         se_ua_cache = kmem_cache_create("se_ua_cache",
  85                         sizeof(struct se_ua), __alignof__(struct se_ua),
  86                         0, NULL);
  87         if (!se_ua_cache) {
  88                 pr_err("kmem_cache_create() for struct se_ua failed\n");
  89                 goto out_free_sess_cache;
  90         }
  91         t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
  92                         sizeof(struct t10_pr_registration),
  93                         __alignof__(struct t10_pr_registration), 0, NULL);
  94         if (!t10_pr_reg_cache) {
  95                 pr_err("kmem_cache_create() for struct t10_pr_registration"
  96                                 " failed\n");
  97                 goto out_free_ua_cache;
  98         }
  99         t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
 100                         sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
 101                         0, NULL);
 102         if (!t10_alua_lu_gp_cache) {
 103                 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
 104                                 " failed\n");
 105                 goto out_free_pr_reg_cache;
 106         }
 107         t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
 108                         sizeof(struct t10_alua_lu_gp_member),
 109                         __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
 110         if (!t10_alua_lu_gp_mem_cache) {
 111                 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
 112                                 "cache failed\n");
 113                 goto out_free_lu_gp_cache;
 114         }
 115         t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
 116                         sizeof(struct t10_alua_tg_pt_gp),
 117                         __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
 118         if (!t10_alua_tg_pt_gp_cache) {
 119                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 120                                 "cache failed\n");
 121                 goto out_free_lu_gp_mem_cache;
 122         }
 123         t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
 124                         "t10_alua_tg_pt_gp_mem_cache",
 125                         sizeof(struct t10_alua_tg_pt_gp_member),
 126                         __alignof__(struct t10_alua_tg_pt_gp_member),
 127                         0, NULL);
 128         if (!t10_alua_tg_pt_gp_mem_cache) {
 129                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 130                                 "mem_t failed\n");
 131                 goto out_free_tg_pt_gp_cache;
 132         }
 133         t10_alua_lba_map_cache = kmem_cache_create(
 134                         "t10_alua_lba_map_cache",
 135                         sizeof(struct t10_alua_lba_map),
 136                         __alignof__(struct t10_alua_lba_map), 0, NULL);
 137         if (!t10_alua_lba_map_cache) {
 138                 pr_err("kmem_cache_create() for t10_alua_lba_map_"
 139                                 "cache failed\n");
 140                 goto out_free_tg_pt_gp_mem_cache;
 141         }
 142         t10_alua_lba_map_mem_cache = kmem_cache_create(
 143                         "t10_alua_lba_map_mem_cache",
 144                         sizeof(struct t10_alua_lba_map_member),
 145                         __alignof__(struct t10_alua_lba_map_member), 0, NULL);
 146         if (!t10_alua_lba_map_mem_cache) {
 147                 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
 148                                 "cache failed\n");
 149                 goto out_free_lba_map_cache;
 150         }
 151
 152         target_completion_wq = alloc_workqueue("target_completion",
 153                                                WQ_MEM_RECLAIM, 0);
 154         if (!target_completion_wq)
 155                 goto out_free_lba_map_mem_cache;
 156
 157         return 0;
 158
 159 out_free_lba_map_mem_cache:
 160         kmem_cache_destroy(t10_alua_lba_map_mem_cache);
 161 out_free_lba_map_cache:
 162         kmem_cache_destroy(t10_alua_lba_map_cache);
 163 out_free_tg_pt_gp_mem_cache:
 164         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 165 out_free_tg_pt_gp_cache:
 166         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 167 out_free_lu_gp_mem_cache:
 168         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 169 out_free_lu_gp_cache:
 170         kmem_cache_destroy(t10_alua_lu_gp_cache);
 171 out_free_pr_reg_cache:
 172         kmem_cache_destroy(t10_pr_reg_cache);
 173 out_free_ua_cache:
 174         kmem_cache_destroy(se_ua_cache);
 175 out_free_sess_cache:
 176         kmem_cache_destroy(se_sess_cache);
 177 out:
 178         return -ENOMEM;
 179 }
 180
 181 void release_se_kmem_caches(void)
 182 {
 183         destroy_workqueue(target_completion_wq);
 184         kmem_cache_destroy(se_sess_cache);
 185         kmem_cache_destroy(se_ua_cache);
 186         kmem_cache_destroy(t10_pr_reg_cache);
 187         kmem_cache_destroy(t10_alua_lu_gp_cache);
 188         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 189         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 190         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 191         kmem_cache_destroy(t10_alua_lba_map_cache);
 192         kmem_cache_destroy(t10_alua_lba_map_mem_cache);
 193 }
 194
 195 /* This code ensures unique mib indexes are handed out. */
 196 static DEFINE_SPINLOCK(scsi_mib_index_lock);
 197 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
 198
 199 /*
 200  * Allocate a new row index for the entry type specified
 201  */
 202 u32 scsi_get_new_index(scsi_index_t type)
 203 {
 204         u32 new_index;
 205
 206         BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
 207
 208         spin_lock(&scsi_mib_index_lock);
 209         new_index = ++scsi_mib_index[type];
 210         spin_unlock(&scsi_mib_index_lock);
 211
 212         return new_index;
 213 }
 214
 215 void transport_subsystem_check_init(void)
 216 {
 217         int ret;
 218         static int sub_api_initialized;
 219
 220         if (sub_api_initialized)
 221                 return;
 222
 223         ret = request_module("target_core_iblock");
 224         if (ret != 0)
 225                 pr_err("Unable to load target_core_iblock\n");
 226
 227         ret = request_module("target_core_file");
 228         if (ret != 0)
 229                 pr_err("Unable to load target_core_file\n");
 230
 231         ret = request_module("target_core_pscsi");
 232         if (ret != 0)
 233                 pr_err("Unable to load target_core_pscsi\n");
 234
 235         ret = request_module("target_core_user");
 236         if (ret != 0)
 237                 pr_err("Unable to load target_core_user\n");
 238
 239         sub_api_initialized = 1;
 240 }
 241
 242 struct se_session *transport_init_session(enum target_prot_op sup_prot_ops)
 243 {
 244         struct se_session *se_sess;
 245
 246         se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
 247         if (!se_sess) {
 248                 pr_err("Unable to allocate struct se_session from"
 249                                 " se_sess_cache\n");
 250                 return ERR_PTR(-ENOMEM);
 251         }
 252         INIT_LIST_HEAD(&se_sess->sess_list);
 253         INIT_LIST_HEAD(&se_sess->sess_acl_list);
 254         INIT_LIST_HEAD(&se_sess->sess_cmd_list);
 255         INIT_LIST_HEAD(&se_sess->sess_wait_list);
 256         spin_lock_init(&se_sess->sess_cmd_lock);
 257         kref_init(&se_sess->sess_kref);
 258         se_sess->sup_prot_ops = sup_prot_ops;
 259
 260         return se_sess;
 261 }
 262 EXPORT_SYMBOL(transport_init_session);
 263
 264 int transport_alloc_session_tags(struct se_session *se_sess,
 265                                  unsigned int tag_num, unsigned int tag_size)
 266 {
 267         int rc;
 268
 269         se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
 270                                         GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
 271         if (!se_sess->sess_cmd_map) {
 272                 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
 273                 if (!se_sess->sess_cmd_map) {
 274                         pr_err("Unable to allocate se_sess->sess_cmd_map\n");
 275                         return -ENOMEM;
 276                 }
 277         }
 278
 279         rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
 280         if (rc < 0) {
 281                 pr_err("Unable to init se_sess->sess_tag_pool,"
 282                         " tag_num: %u\n", tag_num);
 283                 if (is_vmalloc_addr(se_sess->sess_cmd_map))
 284                         vfree(se_sess->sess_cmd_map);
 285                 else
 286                         kfree(se_sess->sess_cmd_map);
 287                 se_sess->sess_cmd_map = NULL;
 288                 return -ENOMEM;
 289         }
 290
 291         return 0;
 292 }
 293 EXPORT_SYMBOL(transport_alloc_session_tags);
 294
 295 struct se_session *transport_init_session_tags(unsigned int tag_num,
 296                                                unsigned int tag_size,
 297                                                enum target_prot_op sup_prot_ops)
 298 {
 299         struct se_session *se_sess;
 300         int rc;
 301
 302         se_sess = transport_init_session(sup_prot_ops);
 303         if (IS_ERR(se_sess))
 304                 return se_sess;
 305
 306         rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
 307         if (rc < 0) {
 308                 transport_free_session(se_sess);
 309                 return ERR_PTR(-ENOMEM);
 310         }
 311
 312         return se_sess;
 313 }
 314 EXPORT_SYMBOL(transport_init_session_tags);
 315
 316 /*
 317  * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
 318  */
 319 void __transport_register_session(
 320         struct se_portal_group *se_tpg,
 321         struct se_node_acl *se_nacl,
 322         struct se_session *se_sess,
 323         void *fabric_sess_ptr)
 324 {
 325         unsigned char buf[PR_REG_ISID_LEN];
 326
 327         se_sess->se_tpg = se_tpg;
 328         se_sess->fabric_sess_ptr = fabric_sess_ptr;
 329         /*
 330          * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
 331          *
 332          * Only set for struct se_session's that will actually be moving I/O.
 333          * eg: *NOT* discovery sessions.
 334          */
 335         if (se_nacl) {
 336                 /*
 337                  * If the fabric module supports an ISID based TransportID,
 338                  * save this value in binary from the fabric I_T Nexus now.
 339                  */
 340                 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
 341                         memset(&buf[0], 0, PR_REG_ISID_LEN);
 342                         se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
 343                                         &buf[0], PR_REG_ISID_LEN);
 344                         se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
 345                 }
 346                 kref_get(&se_nacl->acl_kref);
 347
 348                 spin_lock_irq(&se_nacl->nacl_sess_lock);
 349                 /*
 350                  * The se_nacl->nacl_sess pointer will be set to the
 351                  * last active I_T Nexus for each struct se_node_acl.
 352                  */
 353                 se_nacl->nacl_sess = se_sess;
 354
 355                 list_add_tail(&se_sess->sess_acl_list,
 356                               &se_nacl->acl_sess_list);
 357                 spin_unlock_irq(&se_nacl->nacl_sess_lock);
 358         }
 359         list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
 360
 361         pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
 362                 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
 363 }
 364 EXPORT_SYMBOL(__transport_register_session);
 365
 366 void transport_register_session(
 367         struct se_portal_group *se_tpg,
 368         struct se_node_acl *se_nacl,
 369         struct se_session *se_sess,
 370         void *fabric_sess_ptr)
 371 {
 372         unsigned long flags;
 373
 374         spin_lock_irqsave(&se_tpg->session_lock, flags);
 375         __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
 376         spin_unlock_irqrestore(&se_tpg->session_lock, flags);
 377 }
 378 EXPORT_SYMBOL(transport_register_session);
 379
 380 static void target_release_session(struct kref *kref)
 381 {
 382         struct se_session *se_sess = container_of(kref,
 383                         struct se_session, sess_kref);
 384         struct se_portal_group *se_tpg = se_sess->se_tpg;
 385
 386         se_tpg->se_tpg_tfo->close_session(se_sess);
 387 }
 388
 389 void target_get_session(struct se_session *se_sess)
 390 {
 391         kref_get(&se_sess->sess_kref);
 392 }
 393 EXPORT_SYMBOL(target_get_session);
 394
 395 void target_put_session(struct se_session *se_sess)
 396 {
 397         struct se_portal_group *tpg = se_sess->se_tpg;
 398
 399         if (tpg->se_tpg_tfo->put_session != NULL) {
 400                 tpg->se_tpg_tfo->put_session(se_sess);
 401                 return;
 402         }
 403         kref_put(&se_sess->sess_kref, target_release_session);
 404 }
 405 EXPORT_SYMBOL(target_put_session);
 406
 407 static void target_complete_nacl(struct kref *kref)
 408 {
 409         struct se_node_acl *nacl = container_of(kref,
 410                                 struct se_node_acl, acl_kref);
 411
 412         complete(&nacl->acl_free_comp);
 413 }
 414
 415 void target_put_nacl(struct se_node_acl *nacl)
 416 {
 417         kref_put(&nacl->acl_kref, target_complete_nacl);
 418 }
 419
 420 void transport_deregister_session_configfs(struct se_session *se_sess)
 421 {
 422         struct se_node_acl *se_nacl;
 423         unsigned long flags;
 424         /*
 425          * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
 426          */
 427         se_nacl = se_sess->se_node_acl;
 428         if (se_nacl) {
 429                 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
 430                 if (se_nacl->acl_stop == 0)
 431                         list_del(&se_sess->sess_acl_list);
 432                 /*
 433                  * If the session list is empty, then clear the pointer.
 434                  * Otherwise, set the struct se_session pointer from the tail
 435                  * element of the per struct se_node_acl active session list.
 436                  */
 437                 if (list_empty(&se_nacl->acl_sess_list))
 438                         se_nacl->nacl_sess = NULL;
 439                 else {
 440                         se_nacl->nacl_sess = container_of(
 441                                         se_nacl->acl_sess_list.prev,
 442                                         struct se_session, sess_acl_list);
 443                 }
 444                 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
 445         }
 446 }
 447 EXPORT_SYMBOL(transport_deregister_session_configfs);
 448
 449 void transport_free_session(struct se_session *se_sess)
 450 {
 451         if (se_sess->sess_cmd_map) {
 452                 percpu_ida_destroy(&se_sess->sess_tag_pool);
 453                 if (is_vmalloc_addr(se_sess->sess_cmd_map))
 454                         vfree(se_sess->sess_cmd_map);
 455                 else
 456                         kfree(se_sess->sess_cmd_map);
 457         }
 458         kmem_cache_free(se_sess_cache, se_sess);
 459 }
 460 EXPORT_SYMBOL(transport_free_session);
 461
 462 void transport_deregister_session(struct se_session *se_sess)
 463 {
 464         struct se_portal_group *se_tpg = se_sess->se_tpg;
 465         struct target_core_fabric_ops *se_tfo;
 466         struct se_node_acl *se_nacl;
 467         unsigned long flags;
 468         bool comp_nacl = true;
 469
 470         if (!se_tpg) {
 471                 transport_free_session(se_sess);
 472                 return;
 473         }
 474         se_tfo = se_tpg->se_tpg_tfo;
 475
 476         spin_lock_irqsave(&se_tpg->session_lock, flags);
 477         list_del(&se_sess->sess_list);
 478         se_sess->se_tpg = NULL;
 479         se_sess->fabric_sess_ptr = NULL;
 480         spin_unlock_irqrestore(&se_tpg->session_lock, flags);
 481
 482         /*
 483          * Determine if we need to do extra work for this initiator node's
 484          * struct se_node_acl if it had been previously dynamically generated.
 485          */
 486         se_nacl = se_sess->se_node_acl;
 487
 488         spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 489         if (se_nacl && se_nacl->dynamic_node_acl) {
 490                 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
 491                         list_del(&se_nacl->acl_list);
 492                         se_tpg->num_node_acls--;
 493                         spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 494                         core_tpg_wait_for_nacl_pr_ref(se_nacl);
 495                         core_free_device_list_for_node(se_nacl, se_tpg);
 496                         se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
 497
 498                         comp_nacl = false;
 499                         spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 500                 }
 501         }
 502         spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 503
 504         pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
 505                 se_tpg->se_tpg_tfo->get_fabric_name());
 506         /*
 507          * If last kref is dropping now for an explicit NodeACL, awake sleeping
 508          * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
 509          * removal context.
 510          */
 511         if (se_nacl && comp_nacl)
 512                 target_put_nacl(se_nacl);
 513
 514         transport_free_session(se_sess);
 515 }
 516 EXPORT_SYMBOL(transport_deregister_session);
 517
 518 /*
 519  * Called with cmd->t_state_lock held.
 520  */
 521 static void target_remove_from_state_list(struct se_cmd *cmd)
 522 {
 523         struct se_device *dev = cmd->se_dev;
 524         unsigned long flags;
 525
 526         if (!dev)
 527                 return;
 528
 529         if (cmd->transport_state & CMD_T_BUSY)
 530                 return;
 531
 532         spin_lock_irqsave(&dev->execute_task_lock, flags);
 533         if (cmd->state_active) {
 534                 list_del(&cmd->state_list);
 535                 cmd->state_active = false;
 536         }
 537         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 538 }
 539
 540 static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
 541                                     bool write_pending)
 542 {
 543         unsigned long flags;
 544
 545         spin_lock_irqsave(&cmd->t_state_lock, flags);
 546         if (write_pending)
 547                 cmd->t_state = TRANSPORT_WRITE_PENDING;
 548
 549         if (remove_from_lists) {
 550                 target_remove_from_state_list(cmd);
 551
 552                 /*
 553                  * Clear struct se_cmd->se_lun before the handoff to FE.
 554                  */
 555                 cmd->se_lun = NULL;
 556         }
 557
 558         /*
 559          * Determine if frontend context caller is requesting the stopping of
 560          * this command for frontend exceptions.
 561          */
 562         if (cmd->transport_state & CMD_T_STOP) {
 563                 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
 564                         __func__, __LINE__,
 565                         cmd->se_tfo->get_task_tag(cmd));
 566
 567                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 568
 569                 complete_all(&cmd->t_transport_stop_comp);
 570                 return 1;
 571         }
 572
 573         cmd->transport_state &= ~CMD_T_ACTIVE;
 574         if (remove_from_lists) {
 575                 /*
 576                  * Some fabric modules like tcm_loop can release
 577                  * their internally allocated I/O reference now and
 578                  * struct se_cmd now.
 579                  *
 580                  * Fabric modules are expected to return '1' here if the
 581                  * se_cmd being passed is released at this point,
 582                  * or zero if not being released.
 583                  */
 584                 if (cmd->se_tfo->check_stop_free != NULL) {
 585                         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 586                         return cmd->se_tfo->check_stop_free(cmd);
 587                 }
 588         }
 589
 590         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 591         return 0;
 592 }
 593
 594 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
 595 {
 596         return transport_cmd_check_stop(cmd, true, false);
 597 }
 598
 599 static void transport_lun_remove_cmd(struct se_cmd *cmd)
 600 {
 601         struct se_lun *lun = cmd->se_lun;
 602
 603         if (!lun)
 604                 return;
 605
 606         if (cmpxchg(&cmd->lun_ref_active, true, false))
 607                 percpu_ref_put(&lun->lun_ref);
 608 }
 609
 610 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
 611 {
 612         if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
 613                 transport_lun_remove_cmd(cmd);
 614         /*
 615          * Allow the fabric driver to unmap any resources before
 616          * releasing the descriptor via TFO->release_cmd()
 617          */
 618         if (remove)
 619                 cmd->se_tfo->aborted_task(cmd);
 620
 621         if (transport_cmd_check_stop_to_fabric(cmd))
 622                 return;
 623         if (remove)
 624                 transport_put_cmd(cmd);
 625 }
 626
 627 static void target_complete_failure_work(struct work_struct *work)
 628 {
 629         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
 630
 631         transport_generic_request_failure(cmd,
 632                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
 633 }
 634
 635 /*
 636  * Used when asking transport to copy Sense Data from the underlying
 637  * Linux/SCSI struct scsi_cmnd
 638  */
 639 static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
 640 {
 641         struct se_device *dev = cmd->se_dev;
 642
 643         WARN_ON(!cmd->se_lun);
 644
 645         if (!dev)
 646                 return NULL;
 647
 648         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
 649                 return NULL;
 650
 651         cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
 652
 653         pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
 654                 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
 655         return cmd->sense_buffer;
 656 }
 657
 658 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
 659 {
 660         struct se_device *dev = cmd->se_dev;
 661         int success = scsi_status == GOOD;
 662         unsigned long flags;
 663
 664         cmd->scsi_status = scsi_status;
 665
 666
 667         spin_lock_irqsave(&cmd->t_state_lock, flags);
 668         cmd->transport_state &= ~CMD_T_BUSY;
 669
 670         if (dev && dev->transport->transport_complete) {
 671                 dev->transport->transport_complete(cmd,
 672                                 cmd->t_data_sg,
 673                                 transport_get_sense_buffer(cmd));
 674                 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
 675                         success = 1;
 676         }
 677
 678         /*
 679          * See if we are waiting to complete for an exception condition.
 680          */
 681         if (cmd->transport_state & CMD_T_REQUEST_STOP) {
 682                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 683                 complete(&cmd->task_stop_comp);
 684                 return;
 685         }
 686
 687         /*
 688          * Check for case where an explicit ABORT_TASK has been received
 689          * and transport_wait_for_tasks() will be waiting for completion..
 690          */
 691         if (cmd->transport_state & CMD_T_ABORTED &&
 692             cmd->transport_state & CMD_T_STOP) {
 693                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 694                 complete_all(&cmd->t_transport_stop_comp);
 695                 return;
 696         } else if (!success) {
 697                 INIT_WORK(&cmd->work, target_complete_failure_work);
 698         } else {
 699                 INIT_WORK(&cmd->work, target_complete_ok_work);
 700         }
 701
 702         cmd->t_state = TRANSPORT_COMPLETE;
 703         cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
 704         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 705
 706         queue_work(target_completion_wq, &cmd->work);
 707 }
 708 EXPORT_SYMBOL(target_complete_cmd);
 709
 710 void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
 711 {
 712         if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
 713                 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
 714                         cmd->residual_count += cmd->data_length - length;
 715                 } else {
 716                         cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
 717                         cmd->residual_count = cmd->data_length - length;
 718                 }
 719
 720                 cmd->data_length = length;
 721         }
 722
 723         target_complete_cmd(cmd, scsi_status);
 724 }
 725 EXPORT_SYMBOL(target_complete_cmd_with_length);
 726
 727 static void target_add_to_state_list(struct se_cmd *cmd)
 728 {
 729         struct se_device *dev = cmd->se_dev;
 730         unsigned long flags;
 731
 732         spin_lock_irqsave(&dev->execute_task_lock, flags);
 733         if (!cmd->state_active) {
 734                 list_add_tail(&cmd->state_list, &dev->state_list);
 735                 cmd->state_active = true;
 736         }
 737         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 738 }
 739
 740 /*
 741  * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
 742  */
 743 static void transport_write_pending_qf(struct se_cmd *cmd);
 744 static void transport_complete_qf(struct se_cmd *cmd);
 745
 746 void target_qf_do_work(struct work_struct *work)
 747 {
 748         struct se_device *dev = container_of(work, struct se_device,
 749                                         qf_work_queue);
 750         LIST_HEAD(qf_cmd_list);
 751         struct se_cmd *cmd, *cmd_tmp;
 752
 753         spin_lock_irq(&dev->qf_cmd_lock);
 754         list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
 755         spin_unlock_irq(&dev->qf_cmd_lock);
 756
 757         list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
 758                 list_del(&cmd->se_qf_node);
 759                 atomic_dec_mb(&dev->dev_qf_count);
 760
 761                 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
 762                         " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
 763                         (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
 764                         (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
 765                         : "UNKNOWN");
 766
 767                 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
 768                         transport_write_pending_qf(cmd);
 769                 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
 770                         transport_complete_qf(cmd);
 771         }
 772 }
 773
 774 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
 775 {
 776         switch (cmd->data_direction) {
 777         case DMA_NONE:
 778                 return "NONE";
 779         case DMA_FROM_DEVICE:
 780                 return "READ";
 781         case DMA_TO_DEVICE:
 782                 return "WRITE";
 783         case DMA_BIDIRECTIONAL:
 784                 return "BIDI";
 785         default:
 786                 break;
 787         }
 788
 789         return "UNKNOWN";
 790 }
 791
 792 void transport_dump_dev_state(
 793         struct se_device *dev,
 794         char *b,
 795         int *bl)
 796 {
 797         *bl += sprintf(b + *bl, "Status: ");
 798         if (dev->export_count)
 799                 *bl += sprintf(b + *bl, "ACTIVATED");
 800         else
 801                 *bl += sprintf(b + *bl, "DEACTIVATED");
 802
 803         *bl += sprintf(b + *bl, "  Max Queue Depth: %d", dev->queue_depth);
 804         *bl += sprintf(b + *bl, "  SectorSize: %u  HwMaxSectors: %u\n",
 805                 dev->dev_attrib.block_size,
 806                 dev->dev_attrib.hw_max_sectors);
 807         *bl += sprintf(b + *bl, "        ");
 808 }
 809
 810 void transport_dump_vpd_proto_id(
 811         struct t10_vpd *vpd,
 812         unsigned char *p_buf,
 813         int p_buf_len)
 814 {
 815         unsigned char buf[VPD_TMP_BUF_SIZE];
 816         int len;
 817
 818         memset(buf, 0, VPD_TMP_BUF_SIZE);
 819         len = sprintf(buf, "T10 VPD Protocol Identifier: ");
 820
 821         switch (vpd->protocol_identifier) {
 822         case 0x00:
 823                 sprintf(buf+len, "Fibre Channel\n");
 824                 break;
 825         case 0x10:
 826                 sprintf(buf+len, "Parallel SCSI\n");
 827                 break;
 828         case 0x20:
 829                 sprintf(buf+len, "SSA\n");
 830                 break;
 831         case 0x30:
 832                 sprintf(buf+len, "IEEE 1394\n");
 833                 break;
 834         case 0x40:
 835                 sprintf(buf+len, "SCSI Remote Direct Memory Access"
 836                                 " Protocol\n");
 837                 break;
 838         case 0x50:
 839                 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
 840                 break;
 841         case 0x60:
 842                 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
 843                 break;
 844         case 0x70:
 845                 sprintf(buf+len, "Automation/Drive Interface Transport"
 846                                 " Protocol\n");
 847                 break;
 848         case 0x80:
 849                 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
 850                 break;
 851         default:
 852                 sprintf(buf+len, "Unknown 0x%02x\n",
 853                                 vpd->protocol_identifier);
 854                 break;
 855         }
 856
 857         if (p_buf)
 858                 strncpy(p_buf, buf, p_buf_len);
 859         else
 860                 pr_debug("%s", buf);
 861 }
 862
 863 void
 864 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
 865 {
 866         /*
 867          * Check if the Protocol Identifier Valid (PIV) bit is set..
 868          *
 869          * from spc3r23.pdf section 7.5.1
 870          */
 871          if (page_83[1] & 0x80) {
 872                 vpd->protocol_identifier = (page_83[0] & 0xf0);
 873                 vpd->protocol_identifier_set = 1;
 874                 transport_dump_vpd_proto_id(vpd, NULL, 0);
 875         }
 876 }
 877 EXPORT_SYMBOL(transport_set_vpd_proto_id);
 878
 879 int transport_dump_vpd_assoc(
 880         struct t10_vpd *vpd,
 881         unsigned char *p_buf,
 882         int p_buf_len)
 883 {
 884         unsigned char buf[VPD_TMP_BUF_SIZE];
 885         int ret = 0;
 886         int len;
 887
 888         memset(buf, 0, VPD_TMP_BUF_SIZE);
 889         len = sprintf(buf, "T10 VPD Identifier Association: ");
 890
 891         switch (vpd->association) {
 892         case 0x00:
 893                 sprintf(buf+len, "addressed logical unit\n");
 894                 break;
 895         case 0x10:
 896                 sprintf(buf+len, "target port\n");
 897                 break;
 898         case 0x20:
 899                 sprintf(buf+len, "SCSI target device\n");
 900                 break;
 901         default:
 902                 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
 903                 ret = -EINVAL;
 904                 break;
 905         }
 906
 907         if (p_buf)
 908                 strncpy(p_buf, buf, p_buf_len);
 909         else
 910                 pr_debug("%s", buf);
 911
 912         return ret;
 913 }
 914
 915 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
 916 {
 917         /*
 918          * The VPD identification association..
 919          *
 920          * from spc3r23.pdf Section 7.6.3.1 Table 297
 921          */
 922         vpd->association = (page_83[1] & 0x30);
 923         return transport_dump_vpd_assoc(vpd, NULL, 0);
 924 }
 925 EXPORT_SYMBOL(transport_set_vpd_assoc);
 926
 927 int transport_dump_vpd_ident_type(
 928         struct t10_vpd *vpd,
 929         unsigned char *p_buf,
 930         int p_buf_len)
 931 {
 932         unsigned char buf[VPD_TMP_BUF_SIZE];
 933         int ret = 0;
 934         int len;
 935
 936         memset(buf, 0, VPD_TMP_BUF_SIZE);
 937         len = sprintf(buf, "T10 VPD Identifier Type: ");
 938
 939         switch (vpd->device_identifier_type) {
 940         case 0x00:
 941                 sprintf(buf+len, "Vendor specific\n");
 942                 break;
 943         case 0x01:
 944                 sprintf(buf+len, "T10 Vendor ID based\n");
 945                 break;
 946         case 0x02:
 947                 sprintf(buf+len, "EUI-64 based\n");
 948                 break;
 949         case 0x03:
 950                 sprintf(buf+len, "NAA\n");
 951                 break;
 952         case 0x04:
 953                 sprintf(buf+len, "Relative target port identifier\n");
 954                 break;
 955         case 0x08:
 956                 sprintf(buf+len, "SCSI name string\n");
 957                 break;
 958         default:
 959                 sprintf(buf+len, "Unsupported: 0x%02x\n",
 960                                 vpd->device_identifier_type);
 961                 ret = -EINVAL;
 962                 break;
 963         }
 964
 965         if (p_buf) {
 966                 if (p_buf_len < strlen(buf)+1)
 967                         return -EINVAL;
 968                 strncpy(p_buf, buf, p_buf_len);
 969         } else {
 970                 pr_debug("%s", buf);
 971         }
 972
 973         return ret;
 974 }
 975
 976 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
 977 {
 978         /*
 979          * The VPD identifier type..
 980          *
 981          * from spc3r23.pdf Section 7.6.3.1 Table 298
 982          */
 983         vpd->device_identifier_type = (page_83[1] & 0x0f);
 984         return transport_dump_vpd_ident_type(vpd, NULL, 0);
 985 }
 986 EXPORT_SYMBOL(transport_set_vpd_ident_type);
 987
 988 int transport_dump_vpd_ident(
 989         struct t10_vpd *vpd,
 990         unsigned char *p_buf,
 991         int p_buf_len)
 992 {
 993         unsigned char buf[VPD_TMP_BUF_SIZE];
 994         int ret = 0;
 995
 996         memset(buf, 0, VPD_TMP_BUF_SIZE);
 997
 998         switch (vpd->device_identifier_code_set) {
 999         case 0x01: /* Binary */
1000                 snprintf(buf, sizeof(buf),
1001                         "T10 VPD Binary Device Identifier: %s\n",
1002                         &vpd->device_identifier[0]);
1003                 break;
1004         case 0x02: /* ASCII */
1005                 snprintf(buf, sizeof(buf),
1006                         "T10 VPD ASCII Device Identifier: %s\n",
1007                         &vpd->device_identifier[0]);
1008                 break;
1009         case 0x03: /* UTF-8 */
1010                 snprintf(buf, sizeof(buf),
1011                         "T10 VPD UTF-8 Device Identifier: %s\n",
1012                         &vpd->device_identifier[0]);
1013                 break;
1014         default:
1015                 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1016                         " 0x%02x", vpd->device_identifier_code_set);
1017                 ret = -EINVAL;
1018                 break;
1019         }
1020
1021         if (p_buf)
1022                 strncpy(p_buf, buf, p_buf_len);
1023         else
1024                 pr_debug("%s", buf);
1025
1026         return ret;
1027 }
1028
1029 int
1030 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1031 {
1032         static const char hex_str[] = "0123456789abcdef";
1033         int j = 0, i = 4; /* offset to start of the identifier */
1034
1035         /*
1036          * The VPD Code Set (encoding)
1037          *
1038          * from spc3r23.pdf Section 7.6.3.1 Table 296
1039          */
1040         vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1041         switch (vpd->device_identifier_code_set) {
1042         case 0x01: /* Binary */
1043                 vpd->device_identifier[j++] =
1044                                 hex_str[vpd->device_identifier_type];
1045                 while (i < (4 + page_83[3])) {
1046                         vpd->device_identifier[j++] =
1047                                 hex_str[(page_83[i] & 0xf0) >> 4];
1048                         vpd->device_identifier[j++] =
1049                                 hex_str[page_83[i] & 0x0f];
1050                         i++;
1051                 }
1052                 break;
1053         case 0x02: /* ASCII */
1054         case 0x03: /* UTF-8 */
1055                 while (i < (4 + page_83[3]))
1056                         vpd->device_identifier[j++] = page_83[i++];
1057                 break;
1058         default:
1059                 break;
1060         }
1061
1062         return transport_dump_vpd_ident(vpd, NULL, 0);
1063 }
1064 EXPORT_SYMBOL(transport_set_vpd_ident);
1065
1066 sense_reason_t
1067 target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
1068 {
1069         struct se_device *dev = cmd->se_dev;
1070
1071         if (cmd->unknown_data_length) {
1072                 cmd->data_length = size;
1073         } else if (size != cmd->data_length) {
1074                 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1075                         " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1076                         " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1077                                 cmd->data_length, size, cmd->t_task_cdb[0]);
1078
1079                 if (cmd->data_direction == DMA_TO_DEVICE) {
1080                         pr_err("Rejecting underflow/overflow"
1081                                         " WRITE data\n");
1082                         return TCM_INVALID_CDB_FIELD;
1083                 }
1084                 /*
1085                  * Reject READ_* or WRITE_* with overflow/underflow for
1086                  * type SCF_SCSI_DATA_CDB.
1087                  */
1088                 if (dev->dev_attrib.block_size != 512)  {
1089                         pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1090                                 " CDB on non 512-byte sector setup subsystem"
1091                                 " plugin: %s\n", dev->transport->name);
1092                         /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1093                         return TCM_INVALID_CDB_FIELD;
1094                 }
1095                 /*
1096                  * For the overflow case keep the existing fabric provided
1097                  * ->data_length.  Otherwise for the underflow case, reset
1098                  * ->data_length to the smaller SCSI expected data transfer
1099                  * length.
1100                  */
1101                 if (size > cmd->data_length) {
1102                         cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1103                         cmd->residual_count = (size - cmd->data_length);
1104                 } else {
1105                         cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1106                         cmd->residual_count = (cmd->data_length - size);
1107                         cmd->data_length = size;
1108                 }
1109         }
1110
1111         return 0;
1112
1113 }
1114
1115 /*
1116  * Used by fabric modules containing a local struct se_cmd within their
1117  * fabric dependent per I/O descriptor.
1118  */
1119 void transport_init_se_cmd(
1120         struct se_cmd *cmd,
1121         struct target_core_fabric_ops *tfo,
1122         struct se_session *se_sess,
1123         u32 data_length,
1124         int data_direction,
1125         int task_attr,
1126         unsigned char *sense_buffer)
1127 {
1128         INIT_LIST_HEAD(&cmd->se_delayed_node);
1129         INIT_LIST_HEAD(&cmd->se_qf_node);
1130         INIT_LIST_HEAD(&cmd->se_cmd_list);
1131         INIT_LIST_HEAD(&cmd->state_list);
1132         init_completion(&cmd->t_transport_stop_comp);
1133         init_completion(&cmd->cmd_wait_comp);
1134         init_completion(&cmd->task_stop_comp);
1135         spin_lock_init(&cmd->t_state_lock);
1136         kref_init(&cmd->cmd_kref);
1137         cmd->transport_state = CMD_T_DEV_ACTIVE;
1138
1139         cmd->se_tfo = tfo;
1140         cmd->se_sess = se_sess;
1141         cmd->data_length = data_length;
1142         cmd->data_direction = data_direction;
1143         cmd->sam_task_attr = task_attr;
1144         cmd->sense_buffer = sense_buffer;
1145
1146         cmd->state_active = false;
1147 }
1148 EXPORT_SYMBOL(transport_init_se_cmd);
1149
1150 static sense_reason_t
1151 transport_check_alloc_task_attr(struct se_cmd *cmd)
1152 {
1153         struct se_device *dev = cmd->se_dev;
1154
1155         /*
1156          * Check if SAM Task Attribute emulation is enabled for this
1157          * struct se_device storage object
1158          */
1159         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1160                 return 0;
1161
1162         if (cmd->sam_task_attr == MSG_ACA_TAG) {
1163                 pr_debug("SAM Task Attribute ACA"
1164                         " emulation is not supported\n");
1165                 return TCM_INVALID_CDB_FIELD;
1166         }
1167         /*
1168          * Used to determine when ORDERED commands should go from
1169          * Dormant to Active status.
1170          */
1171         cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
1172         pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1173                         cmd->se_ordered_id, cmd->sam_task_attr,
1174                         dev->transport->name);
1175         return 0;
1176 }
1177
1178 sense_reason_t
1179 target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
1180 {
1181         struct se_device *dev = cmd->se_dev;
1182         sense_reason_t ret;
1183
1184         /*
1185          * Ensure that the received CDB is less than the max (252 + 8) bytes
1186          * for VARIABLE_LENGTH_CMD
1187          */
1188         if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1189                 pr_err("Received SCSI CDB with command_size: %d that"
1190                         " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1191                         scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1192                 return TCM_INVALID_CDB_FIELD;
1193         }
1194         /*
1195          * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1196          * allocate the additional extended CDB buffer now..  Otherwise
1197          * setup the pointer from __t_task_cdb to t_task_cdb.
1198          */
1199         if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1200                 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1201                                                 GFP_KERNEL);
1202                 if (!cmd->t_task_cdb) {
1203                         pr_err("Unable to allocate cmd->t_task_cdb"
1204                                 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1205                                 scsi_command_size(cdb),
1206                                 (unsigned long)sizeof(cmd->__t_task_cdb));
1207                         return TCM_OUT_OF_RESOURCES;
1208                 }
1209         } else
1210                 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1211         /*
1212          * Copy the original CDB into cmd->
1213          */
1214         memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1215
1216         trace_target_sequencer_start(cmd);
1217
1218         /*
1219          * Check for an existing UNIT ATTENTION condition
1220          */
1221         ret = target_scsi3_ua_check(cmd);
1222         if (ret)
1223                 return ret;
1224
1225         ret = target_alua_state_check(cmd);
1226         if (ret)
1227                 return ret;
1228
1229         ret = target_check_reservation(cmd);
1230         if (ret) {
1231                 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1232                 return ret;
1233         }
1234
1235         ret = dev->transport->parse_cdb(cmd);
1236         if (ret)
1237                 return ret;
1238
1239         ret = transport_check_alloc_task_attr(cmd);
1240         if (ret)
1241                 return ret;
1242
1243         cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1244
1245         spin_lock(&cmd->se_lun->lun_sep_lock);
1246         if (cmd->se_lun->lun_sep)
1247                 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1248         spin_unlock(&cmd->se_lun->lun_sep_lock);
1249         return 0;
1250 }
1251 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1252
1253 /*
1254  * Used by fabric module frontends to queue tasks directly.
1255  * Many only be used from process context only
1256  */
1257 int transport_handle_cdb_direct(
1258         struct se_cmd *cmd)
1259 {
1260         sense_reason_t ret;
1261
1262         if (!cmd->se_lun) {
1263                 dump_stack();
1264                 pr_err("cmd->se_lun is NULL\n");
1265                 return -EINVAL;
1266         }
1267         if (in_interrupt()) {
1268                 dump_stack();
1269                 pr_err("transport_generic_handle_cdb cannot be called"
1270                                 " from interrupt context\n");
1271                 return -EINVAL;
1272         }
1273         /*
1274          * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1275          * outstanding descriptors are handled correctly during shutdown via
1276          * transport_wait_for_tasks()
1277          *
1278          * Also, we don't take cmd->t_state_lock here as we only expect
1279          * this to be called for initial descriptor submission.
1280          */
1281         cmd->t_state = TRANSPORT_NEW_CMD;
1282         cmd->transport_state |= CMD_T_ACTIVE;
1283
1284         /*
1285          * transport_generic_new_cmd() is already handling QUEUE_FULL,
1286          * so follow TRANSPORT_NEW_CMD processing thread context usage
1287          * and call transport_generic_request_failure() if necessary..
1288          */
1289         ret = transport_generic_new_cmd(cmd);
1290         if (ret)
1291                 transport_generic_request_failure(cmd, ret);
1292         return 0;
1293 }
1294 EXPORT_SYMBOL(transport_handle_cdb_direct);
1295
1296 sense_reason_t
1297 transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1298                 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1299 {
1300         if (!sgl || !sgl_count)
1301                 return 0;
1302
1303         /*
1304          * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1305          * scatterlists already have been set to follow what the fabric
1306          * passes for the original expected data transfer length.
1307          */
1308         if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1309                 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1310                         " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1311                 return TCM_INVALID_CDB_FIELD;
1312         }
1313
1314         cmd->t_data_sg = sgl;
1315         cmd->t_data_nents = sgl_count;
1316
1317         if (sgl_bidi && sgl_bidi_count) {
1318                 cmd->t_bidi_data_sg = sgl_bidi;
1319                 cmd->t_bidi_data_nents = sgl_bidi_count;
1320         }
1321         cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1322         return 0;
1323 }
1324
1325 /*
1326  * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1327  *                       se_cmd + use pre-allocated SGL memory.
1328  *
1329  * @se_cmd: command descriptor to submit
1330  * @se_sess: associated se_sess for endpoint
1331  * @cdb: pointer to SCSI CDB
1332  * @sense: pointer to SCSI sense buffer
1333  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1334  * @data_length: fabric expected data transfer length
1335  * @task_addr: SAM task attribute
1336  * @data_dir: DMA data direction
1337  * @flags: flags for command submission from target_sc_flags_tables
1338  * @sgl: struct scatterlist memory for unidirectional mapping
1339  * @sgl_count: scatterlist count for unidirectional mapping
1340  * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1341  * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
1342  * @sgl_prot: struct scatterlist memory protection information
1343  * @sgl_prot_count: scatterlist count for protection information
1344  *
1345  * Returns non zero to signal active I/O shutdown failure.  All other
1346  * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1347  * but still return zero here.
1348  *
1349  * This may only be called from process context, and also currently
1350  * assumes internal allocation of fabric payload buffer by target-core.
1351  */
1352 int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
1353                 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1354                 u32 data_length, int task_attr, int data_dir, int flags,
1355                 struct scatterlist *sgl, u32 sgl_count,
1356                 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1357                 struct scatterlist *sgl_prot, u32 sgl_prot_count)
1358 {
1359         struct se_portal_group *se_tpg;
1360         sense_reason_t rc;
1361         int ret;
1362
1363         se_tpg = se_sess->se_tpg;
1364         BUG_ON(!se_tpg);
1365         BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1366         BUG_ON(in_interrupt());
1367         /*
1368          * Initialize se_cmd for target operation.  From this point
1369          * exceptions are handled by sending exception status via
1370          * target_core_fabric_ops->queue_status() callback
1371          */
1372         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1373                                 data_length, data_dir, task_attr, sense);
1374         if (flags & TARGET_SCF_UNKNOWN_SIZE)
1375                 se_cmd->unknown_data_length = 1;
1376         /*
1377          * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1378          * se_sess->sess_cmd_list.  A second kref_get here is necessary
1379          * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1380          * kref_put() to happen during fabric packet acknowledgement.
1381          */
1382         ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1383         if (ret)
1384                 return ret;
1385         /*
1386          * Signal bidirectional data payloads to target-core
1387          */
1388         if (flags & TARGET_SCF_BIDI_OP)
1389                 se_cmd->se_cmd_flags |= SCF_BIDI;
1390         /*
1391          * Locate se_lun pointer and attach it to struct se_cmd
1392          */
1393         rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1394         if (rc) {
1395                 transport_send_check_condition_and_sense(se_cmd, rc, 0);
1396                 target_put_sess_cmd(se_sess, se_cmd);
1397                 return 0;
1398         }
1399
1400         rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1401         if (rc != 0) {
1402                 transport_generic_request_failure(se_cmd, rc);
1403                 return 0;
1404         }
1405
1406         /*
1407          * Save pointers for SGLs containing protection information,
1408          * if present.
1409          */
1410         if (sgl_prot_count) {
1411                 se_cmd->t_prot_sg = sgl_prot;
1412                 se_cmd->t_prot_nents = sgl_prot_count;
1413         }
1414
1415         /*
1416          * When a non zero sgl_count has been passed perform SGL passthrough
1417          * mapping for pre-allocated fabric memory instead of having target
1418          * core perform an internal SGL allocation..
1419          */
1420         if (sgl_count != 0) {
1421                 BUG_ON(!sgl);
1422
1423                 /*
1424                  * A work-around for tcm_loop as some userspace code via
1425                  * scsi-generic do not memset their associated read buffers,
1426                  * so go ahead and do that here for type non-data CDBs.  Also
1427                  * note that this is currently guaranteed to be a single SGL
1428                  * for this case by target core in target_setup_cmd_from_cdb()
1429                  * -> transport_generic_cmd_sequencer().
1430                  */
1431                 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1432                      se_cmd->data_direction == DMA_FROM_DEVICE) {
1433                         unsigned char *buf = NULL;
1434
1435                         if (sgl)
1436                                 buf = kmap(sg_page(sgl)) + sgl->offset;
1437
1438                         if (buf) {
1439                                 memset(buf, 0, sgl->length);
1440                                 kunmap(sg_page(sgl));
1441                         }
1442                 }
1443
1444                 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1445                                 sgl_bidi, sgl_bidi_count);
1446                 if (rc != 0) {
1447                         transport_generic_request_failure(se_cmd, rc);
1448                         return 0;
1449                 }
1450         }
1451
1452         /*
1453          * Check if we need to delay processing because of ALUA
1454          * Active/NonOptimized primary access state..
1455          */
1456         core_alua_check_nonop_delay(se_cmd);
1457
1458         transport_handle_cdb_direct(se_cmd);
1459         return 0;
1460 }
1461 EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1462
1463 /*
1464  * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1465  *
1466  * @se_cmd: command descriptor to submit
1467  * @se_sess: associated se_sess for endpoint
1468  * @cdb: pointer to SCSI CDB
1469  * @sense: pointer to SCSI sense buffer
1470  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1471  * @data_length: fabric expected data transfer length
1472  * @task_addr: SAM task attribute
1473  * @data_dir: DMA data direction
1474  * @flags: flags for command submission from target_sc_flags_tables
1475  *
1476  * Returns non zero to signal active I/O shutdown failure.  All other
1477  * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1478  * but still return zero here.
1479  *
1480  * This may only be called from process context, and also currently
1481  * assumes internal allocation of fabric payload buffer by target-core.
1482  *
1483  * It also assumes interal target core SGL memory allocation.
1484  */
1485 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1486                 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1487                 u32 data_length, int task_attr, int data_dir, int flags)
1488 {
1489         return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1490                         unpacked_lun, data_length, task_attr, data_dir,
1491                         flags, NULL, 0, NULL, 0, NULL, 0);
1492 }
1493 EXPORT_SYMBOL(target_submit_cmd);
1494
1495 static void target_complete_tmr_failure(struct work_struct *work)
1496 {
1497         struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1498
1499         se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1500         se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1501
1502         transport_cmd_check_stop_to_fabric(se_cmd);
1503 }
1504
1505 /**
1506  * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1507  *                     for TMR CDBs
1508  *
1509  * @se_cmd: command descriptor to submit
1510  * @se_sess: associated se_sess for endpoint
1511  * @sense: pointer to SCSI sense buffer
1512  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1513  * @fabric_context: fabric context for TMR req
1514  * @tm_type: Type of TM request
1515  * @gfp: gfp type for caller
1516  * @tag: referenced task tag for TMR_ABORT_TASK
1517  * @flags: submit cmd flags
1518  *
1519  * Callable from all contexts.
1520  **/
1521
1522 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1523                 unsigned char *sense, u32 unpacked_lun,
1524                 void *fabric_tmr_ptr, unsigned char tm_type,
1525                 gfp_t gfp, unsigned int tag, int flags)
1526 {
1527         struct se_portal_group *se_tpg;
1528         int ret;
1529
1530         se_tpg = se_sess->se_tpg;
1531         BUG_ON(!se_tpg);
1532
1533         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1534                               0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1535         /*
1536          * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1537          * allocation failure.
1538          */
1539         ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1540         if (ret < 0)
1541                 return -ENOMEM;
1542
1543         if (tm_type == TMR_ABORT_TASK)
1544                 se_cmd->se_tmr_req->ref_task_tag = tag;
1545
1546         /* See target_submit_cmd for commentary */
1547         ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1548         if (ret) {
1549                 core_tmr_release_req(se_cmd->se_tmr_req);
1550                 return ret;
1551         }
1552
1553         ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1554         if (ret) {
1555                 /*
1556                  * For callback during failure handling, push this work off
1557                  * to process context with TMR_LUN_DOES_NOT_EXIST status.
1558                  */
1559                 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1560                 schedule_work(&se_cmd->work);
1561                 return 0;
1562         }
1563         transport_generic_handle_tmr(se_cmd);
1564         return 0;
1565 }
1566 EXPORT_SYMBOL(target_submit_tmr);
1567
1568 /*
1569  * If the cmd is active, request it to be stopped and sleep until it
1570  * has completed.
1571  */
1572 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1573 {
1574         bool was_active = false;
1575
1576         if (cmd->transport_state & CMD_T_BUSY) {
1577                 cmd->transport_state |= CMD_T_REQUEST_STOP;
1578                 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1579
1580                 pr_debug("cmd %p waiting to complete\n", cmd);
1581                 wait_for_completion(&cmd->task_stop_comp);
1582                 pr_debug("cmd %p stopped successfully\n", cmd);
1583
1584                 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1585                 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1586                 cmd->transport_state &= ~CMD_T_BUSY;
1587                 was_active = true;
1588         }
1589
1590         return was_active;
1591 }
1592
1593 /*
1594  * Handle SAM-esque emulation for generic transport request failures.
1595  */
1596 void transport_generic_request_failure(struct se_cmd *cmd,
1597                 sense_reason_t sense_reason)
1598 {
1599         int ret = 0;
1600
1601         pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1602                 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1603                 cmd->t_task_cdb[0]);
1604         pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
1605                 cmd->se_tfo->get_cmd_state(cmd),
1606                 cmd->t_state, sense_reason);
1607         pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1608                 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1609                 (cmd->transport_state & CMD_T_STOP) != 0,
1610                 (cmd->transport_state & CMD_T_SENT) != 0);
1611
1612         /*
1613          * For SAM Task Attribute emulation for failed struct se_cmd
1614          */
1615         transport_complete_task_attr(cmd);
1616         /*
1617          * Handle special case for COMPARE_AND_WRITE failure, where the
1618          * callback is expected to drop the per device ->caw_mutex.
1619          */
1620         if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1621              cmd->transport_complete_callback)
1622                 cmd->transport_complete_callback(cmd);
1623
1624         switch (sense_reason) {
1625         case TCM_NON_EXISTENT_LUN:
1626         case TCM_UNSUPPORTED_SCSI_OPCODE:
1627         case TCM_INVALID_CDB_FIELD:
1628         case TCM_INVALID_PARAMETER_LIST:
1629         case TCM_PARAMETER_LIST_LENGTH_ERROR:
1630         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1631         case TCM_UNKNOWN_MODE_PAGE:
1632         case TCM_WRITE_PROTECTED:
1633         case TCM_ADDRESS_OUT_OF_RANGE:
1634         case TCM_CHECK_CONDITION_ABORT_CMD:
1635         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1636         case TCM_CHECK_CONDITION_NOT_READY:
1637         case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1638         case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1639         case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
1640                 break;
1641         case TCM_OUT_OF_RESOURCES:
1642                 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1643                 break;
1644         case TCM_RESERVATION_CONFLICT:
1645                 /*
1646                  * No SENSE Data payload for this case, set SCSI Status
1647                  * and queue the response to $FABRIC_MOD.
1648                  *
1649                  * Uses linux/include/scsi/scsi.h SAM status codes defs
1650                  */
1651                 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1652                 /*
1653                  * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1654                  * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1655                  * CONFLICT STATUS.
1656                  *
1657                  * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1658                  */
1659                 if (cmd->se_sess &&
1660                     cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
1661                         core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1662                                 cmd->orig_fe_lun, 0x2C,
1663                                 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1664
1665                 trace_target_cmd_complete(cmd);
1666                 ret = cmd->se_tfo-> queue_status(cmd);
1667                 if (ret == -EAGAIN || ret == -ENOMEM)
1668                         goto queue_full;
1669                 goto check_stop;
1670         default:
1671                 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1672                         cmd->t_task_cdb[0], sense_reason);
1673                 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1674                 break;
1675         }
1676
1677         ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
1678         if (ret == -EAGAIN || ret == -ENOMEM)
1679                 goto queue_full;
1680
1681 check_stop:
1682         transport_lun_remove_cmd(cmd);
1683         if (!transport_cmd_check_stop_to_fabric(cmd))
1684                 ;
1685         return;
1686
1687 queue_full:
1688         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1689         transport_handle_queue_full(cmd, cmd->se_dev);
1690 }
1691 EXPORT_SYMBOL(transport_generic_request_failure);
1692
1693 void __target_execute_cmd(struct se_cmd *cmd)
1694 {
1695         sense_reason_t ret;
1696
1697         if (cmd->execute_cmd) {
1698                 ret = cmd->execute_cmd(cmd);
1699                 if (ret) {
1700                         spin_lock_irq(&cmd->t_state_lock);
1701                         cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1702                         spin_unlock_irq(&cmd->t_state_lock);
1703
1704                         transport_generic_request_failure(cmd, ret);
1705                 }
1706         }
1707 }
1708
1709 static bool target_handle_task_attr(struct se_cmd *cmd)
1710 {
1711         struct se_device *dev = cmd->se_dev;
1712
1713         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1714                 return false;
1715
1716         /*
1717          * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1718          * to allow the passed struct se_cmd list of tasks to the front of the list.
1719          */
1720         switch (cmd->sam_task_attr) {
1721         case MSG_HEAD_TAG:
1722                 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1723                          "se_ordered_id: %u\n",
1724                          cmd->t_task_cdb[0], cmd->se_ordered_id);
1725                 return false;
1726         case MSG_ORDERED_TAG:
1727                 atomic_inc_mb(&dev->dev_ordered_sync);
1728
1729                 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1730                          " se_ordered_id: %u\n",
1731                          cmd->t_task_cdb[0], cmd->se_ordered_id);
1732
1733                 /*
1734                  * Execute an ORDERED command if no other older commands
1735                  * exist that need to be completed first.
1736                  */
1737                 if (!atomic_read(&dev->simple_cmds))
1738                         return false;
1739                 break;
1740         default:
1741                 /*
1742                  * For SIMPLE and UNTAGGED Task Attribute commands
1743                  */
1744                 atomic_inc_mb(&dev->simple_cmds);
1745                 break;
1746         }
1747
1748         if (atomic_read(&dev->dev_ordered_sync) == 0)
1749                 return false;
1750
1751         spin_lock(&dev->delayed_cmd_lock);
1752         list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1753         spin_unlock(&dev->delayed_cmd_lock);
1754
1755         pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1756                 " delayed CMD list, se_ordered_id: %u\n",
1757                 cmd->t_task_cdb[0], cmd->sam_task_attr,
1758                 cmd->se_ordered_id);
1759         return true;
1760 }
1761
1762 void target_execute_cmd(struct se_cmd *cmd)
1763 {
1764         /*
1765          * If the received CDB has aleady been aborted stop processing it here.
1766          */
1767         if (transport_check_aborted_status(cmd, 1))
1768                 return;
1769
1770         /*
1771          * Determine if frontend context caller is requesting the stopping of
1772          * this command for frontend exceptions.
1773          */
1774         spin_lock_irq(&cmd->t_state_lock);
1775         if (cmd->transport_state & CMD_T_STOP) {
1776                 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1777                         __func__, __LINE__,
1778                         cmd->se_tfo->get_task_tag(cmd));
1779
1780                 spin_unlock_irq(&cmd->t_state_lock);
1781                 complete_all(&cmd->t_transport_stop_comp);
1782                 return;
1783         }
1784
1785         cmd->t_state = TRANSPORT_PROCESSING;
1786         cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
1787         spin_unlock_irq(&cmd->t_state_lock);
1788         /*
1789          * Perform WRITE_INSERT of PI using software emulation when backend
1790          * device has PI enabled, if the transport has not already generated
1791          * PI using hardware WRITE_INSERT offload.
1792          */
1793         if (cmd->prot_op == TARGET_PROT_DOUT_INSERT) {
1794                 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1795                         sbc_dif_generate(cmd);
1796         }
1797
1798         if (target_handle_task_attr(cmd)) {
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                 return;
1803         }
1804
1805         __target_execute_cmd(cmd);
1806 }
1807 EXPORT_SYMBOL(target_execute_cmd);
1808
1809 /*
1810  * Process all commands up to the last received ORDERED task attribute which
1811  * requires another blocking boundary
1812  */
1813 static void target_restart_delayed_cmds(struct se_device *dev)
1814 {
1815         for (;;) {
1816                 struct se_cmd *cmd;
1817
1818                 spin_lock(&dev->delayed_cmd_lock);
1819                 if (list_empty(&dev->delayed_cmd_list)) {
1820                         spin_unlock(&dev->delayed_cmd_lock);
1821                         break;
1822                 }
1823
1824                 cmd = list_entry(dev->delayed_cmd_list.next,
1825                                  struct se_cmd, se_delayed_node);
1826                 list_del(&cmd->se_delayed_node);
1827                 spin_unlock(&dev->delayed_cmd_lock);
1828
1829                 __target_execute_cmd(cmd);
1830
1831                 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1832                         break;
1833         }
1834 }
1835
1836 /*
1837  * Called from I/O completion to determine which dormant/delayed
1838  * and ordered cmds need to have their tasks added to the execution queue.
1839  */
1840 static void transport_complete_task_attr(struct se_cmd *cmd)
1841 {
1842         struct se_device *dev = cmd->se_dev;
1843
1844         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1845                 return;
1846
1847         if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
1848                 atomic_dec_mb(&dev->simple_cmds);
1849                 dev->dev_cur_ordered_id++;
1850                 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1851                         " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1852                         cmd->se_ordered_id);
1853         } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1854                 dev->dev_cur_ordered_id++;
1855                 pr_debug("Incremented dev_cur_ordered_id: %u for"
1856                         " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1857                         cmd->se_ordered_id);
1858         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
1859                 atomic_dec_mb(&dev->dev_ordered_sync);
1860
1861                 dev->dev_cur_ordered_id++;
1862                 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1863                         " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1864         }
1865
1866         target_restart_delayed_cmds(dev);
1867 }
1868
1869 static void transport_complete_qf(struct se_cmd *cmd)
1870 {
1871         int ret = 0;
1872
1873         transport_complete_task_attr(cmd);
1874
1875         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1876                 trace_target_cmd_complete(cmd);
1877                 ret = cmd->se_tfo->queue_status(cmd);
1878                 goto out;
1879         }
1880
1881         switch (cmd->data_direction) {
1882         case DMA_FROM_DEVICE:
1883                 trace_target_cmd_complete(cmd);
1884                 ret = cmd->se_tfo->queue_data_in(cmd);
1885                 break;
1886         case DMA_TO_DEVICE:
1887                 if (cmd->se_cmd_flags & SCF_BIDI) {
1888                         ret = cmd->se_tfo->queue_data_in(cmd);
1889                         if (ret < 0)
1890                                 break;
1891                 }
1892                 /* Fall through for DMA_TO_DEVICE */
1893         case DMA_NONE:
1894                 trace_target_cmd_complete(cmd);
1895                 ret = cmd->se_tfo->queue_status(cmd);
1896                 break;
1897         default:
1898                 break;
1899         }
1900
1901 out:
1902         if (ret < 0) {
1903                 transport_handle_queue_full(cmd, cmd->se_dev);
1904                 return;
1905         }
1906         transport_lun_remove_cmd(cmd);
1907         transport_cmd_check_stop_to_fabric(cmd);
1908 }
1909
1910 static void transport_handle_queue_full(
1911         struct se_cmd *cmd,
1912         struct se_device *dev)
1913 {
1914         spin_lock_irq(&dev->qf_cmd_lock);
1915         list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1916         atomic_inc_mb(&dev->dev_qf_count);
1917         spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1918
1919         schedule_work(&cmd->se_dev->qf_work_queue);
1920 }
1921
1922 static bool target_check_read_strip(struct se_cmd *cmd)
1923 {
1924         sense_reason_t rc;
1925
1926         if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
1927                 rc = sbc_dif_read_strip(cmd);
1928                 if (rc) {
1929                         cmd->pi_err = rc;
1930                         return true;
1931                 }
1932         }
1933
1934         return false;
1935 }
1936
1937 static void target_complete_ok_work(struct work_struct *work)
1938 {
1939         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
1940         int ret;
1941
1942         /*
1943          * Check if we need to move delayed/dormant tasks from cmds on the
1944          * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1945          * Attribute.
1946          */
1947         transport_complete_task_attr(cmd);
1948
1949         /*
1950          * Check to schedule QUEUE_FULL work, or execute an existing
1951          * cmd->transport_qf_callback()
1952          */
1953         if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1954                 schedule_work(&cmd->se_dev->qf_work_queue);
1955
1956         /*
1957          * Check if we need to send a sense buffer from
1958          * the struct se_cmd in question.
1959          */
1960         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1961                 WARN_ON(!cmd->scsi_status);
1962                 ret = transport_send_check_condition_and_sense(
1963                                         cmd, 0, 1);
1964                 if (ret == -EAGAIN || ret == -ENOMEM)
1965                         goto queue_full;
1966
1967                 transport_lun_remove_cmd(cmd);
1968                 transport_cmd_check_stop_to_fabric(cmd);
1969                 return;
1970         }
1971         /*
1972          * Check for a callback, used by amongst other things
1973          * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
1974          */
1975         if (cmd->transport_complete_callback) {
1976                 sense_reason_t rc;
1977
1978                 rc = cmd->transport_complete_callback(cmd);
1979                 if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
1980                         return;
1981                 } else if (rc) {
1982                         ret = transport_send_check_condition_and_sense(cmd,
1983                                                 rc, 0);
1984                         if (ret == -EAGAIN || ret == -ENOMEM)
1985                                 goto queue_full;
1986
1987                         transport_lun_remove_cmd(cmd);
1988                         transport_cmd_check_stop_to_fabric(cmd);
1989                         return;
1990                 }
1991         }
1992
1993         switch (cmd->data_direction) {
1994         case DMA_FROM_DEVICE:
1995                 spin_lock(&cmd->se_lun->lun_sep_lock);
1996                 if (cmd->se_lun->lun_sep) {
1997                         cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
1998                                         cmd->data_length;
1999                 }
2000                 spin_unlock(&cmd->se_lun->lun_sep_lock);
2001                 /*
2002                  * Perform READ_STRIP of PI using software emulation when
2003                  * backend had PI enabled, if the transport will not be
2004                  * performing hardware READ_STRIP offload.
2005                  */
2006                 if (cmd->prot_op == TARGET_PROT_DIN_STRIP &&
2007                     target_check_read_strip(cmd)) {
2008                         ret = transport_send_check_condition_and_sense(cmd,
2009                                                 cmd->pi_err, 0);
2010                         if (ret == -EAGAIN || ret == -ENOMEM)
2011                                 goto queue_full;
2012
2013                         transport_lun_remove_cmd(cmd);
2014                         transport_cmd_check_stop_to_fabric(cmd);
2015                         return;
2016                 }
2017
2018                 trace_target_cmd_complete(cmd);
2019                 ret = cmd->se_tfo->queue_data_in(cmd);
2020                 if (ret == -EAGAIN || ret == -ENOMEM)
2021                         goto queue_full;
2022                 break;
2023         case DMA_TO_DEVICE:
2024                 spin_lock(&cmd->se_lun->lun_sep_lock);
2025                 if (cmd->se_lun->lun_sep) {
2026                         cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
2027                                 cmd->data_length;
2028                 }
2029                 spin_unlock(&cmd->se_lun->lun_sep_lock);
2030                 /*
2031                  * Check if we need to send READ payload for BIDI-COMMAND
2032                  */
2033                 if (cmd->se_cmd_flags & SCF_BIDI) {
2034                         spin_lock(&cmd->se_lun->lun_sep_lock);
2035                         if (cmd->se_lun->lun_sep) {
2036                                 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2037                                         cmd->data_length;
2038                         }
2039                         spin_unlock(&cmd->se_lun->lun_sep_lock);
2040                         ret = cmd->se_tfo->queue_data_in(cmd);
2041                         if (ret == -EAGAIN || ret == -ENOMEM)
2042                                 goto queue_full;
2043                         break;
2044                 }
2045                 /* Fall through for DMA_TO_DEVICE */
2046         case DMA_NONE:
2047                 trace_target_cmd_complete(cmd);
2048                 ret = cmd->se_tfo->queue_status(cmd);
2049                 if (ret == -EAGAIN || ret == -ENOMEM)
2050                         goto queue_full;
2051                 break;
2052         default:
2053                 break;
2054         }
2055
2056         transport_lun_remove_cmd(cmd);
2057         transport_cmd_check_stop_to_fabric(cmd);
2058         return;
2059
2060 queue_full:
2061         pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2062                 " data_direction: %d\n", cmd, cmd->data_direction);
2063         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2064         transport_handle_queue_full(cmd, cmd->se_dev);
2065 }
2066
2067 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
2068 {
2069         struct scatterlist *sg;
2070         int count;
2071
2072         for_each_sg(sgl, sg, nents, count)
2073                 __free_page(sg_page(sg));
2074
2075         kfree(sgl);
2076 }
2077
2078 static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2079 {
2080         /*
2081          * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2082          * emulation, and free + reset pointers if necessary..
2083          */
2084         if (!cmd->t_data_sg_orig)
2085                 return;
2086
2087         kfree(cmd->t_data_sg);
2088         cmd->t_data_sg = cmd->t_data_sg_orig;
2089         cmd->t_data_sg_orig = NULL;
2090         cmd->t_data_nents = cmd->t_data_nents_orig;
2091         cmd->t_data_nents_orig = 0;
2092 }
2093
2094 static inline void transport_free_pages(struct se_cmd *cmd)
2095 {
2096         if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
2097                 transport_reset_sgl_orig(cmd);
2098                 return;
2099         }
2100         transport_reset_sgl_orig(cmd);
2101
2102         transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2103         cmd->t_data_sg = NULL;
2104         cmd->t_data_nents = 0;
2105
2106         transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2107         cmd->t_bidi_data_sg = NULL;
2108         cmd->t_bidi_data_nents = 0;
2109
2110         transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
2111         cmd->t_prot_sg = NULL;
2112         cmd->t_prot_nents = 0;
2113 }
2114
2115 /**
2116  * transport_release_cmd - free a command
2117  * @cmd:       command to free
2118  *
2119  * This routine unconditionally frees a command, and reference counting
2120  * or list removal must be done in the caller.
2121  */
2122 static int transport_release_cmd(struct se_cmd *cmd)
2123 {
2124         BUG_ON(!cmd->se_tfo);
2125
2126         if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2127                 core_tmr_release_req(cmd->se_tmr_req);
2128         if (cmd->t_task_cdb != cmd->__t_task_cdb)
2129                 kfree(cmd->t_task_cdb);
2130         /*
2131          * If this cmd has been setup with target_get_sess_cmd(), drop
2132          * the kref and call ->release_cmd() in kref callback.
2133          */
2134         return target_put_sess_cmd(cmd->se_sess, cmd);
2135 }
2136
2137 /**
2138  * transport_put_cmd - release a reference to a command
2139  * @cmd:       command to release
2140  *
2141  * This routine releases our reference to the command and frees it if possible.
2142  */
2143 static int transport_put_cmd(struct se_cmd *cmd)
2144 {
2145         transport_free_pages(cmd);
2146         return transport_release_cmd(cmd);
2147 }
2148
2149 void *transport_kmap_data_sg(struct se_cmd *cmd)
2150 {
2151         struct scatterlist *sg = cmd->t_data_sg;
2152         struct page **pages;
2153         int i;
2154
2155         /*
2156          * We need to take into account a possible offset here for fabrics like
2157          * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2158          * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2159          */
2160         if (!cmd->t_data_nents)
2161                 return NULL;
2162
2163         BUG_ON(!sg);
2164         if (cmd->t_data_nents == 1)
2165                 return kmap(sg_page(sg)) + sg->offset;
2166
2167         /* >1 page. use vmap */
2168         pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2169         if (!pages)
2170                 return NULL;
2171
2172         /* convert sg[] to pages[] */
2173         for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2174                 pages[i] = sg_page(sg);
2175         }
2176
2177         cmd->t_data_vmap = vmap(pages, cmd->t_data_nents,  VM_MAP, PAGE_KERNEL);
2178         kfree(pages);
2179         if (!cmd->t_data_vmap)
2180                 return NULL;
2181
2182         return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2183 }
2184 EXPORT_SYMBOL(transport_kmap_data_sg);
2185
2186 void transport_kunmap_data_sg(struct se_cmd *cmd)
2187 {
2188         if (!cmd->t_data_nents) {
2189                 return;
2190         } else if (cmd->t_data_nents == 1) {
2191                 kunmap(sg_page(cmd->t_data_sg));
2192                 return;
2193         }
2194
2195         vunmap(cmd->t_data_vmap);
2196         cmd->t_data_vmap = NULL;
2197 }
2198 EXPORT_SYMBOL(transport_kunmap_data_sg);
2199
2200 int
2201 target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2202                  bool zero_page)
2203 {
2204         struct scatterlist *sg;
2205         struct page *page;
2206         gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2207         unsigned int nent;
2208         int i = 0;
2209
2210         nent = DIV_ROUND_UP(length, PAGE_SIZE);
2211         sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2212         if (!sg)
2213                 return -ENOMEM;
2214
2215         sg_init_table(sg, nent);
2216
2217         while (length) {
2218                 u32 page_len = min_t(u32, length, PAGE_SIZE);
2219                 page = alloc_page(GFP_KERNEL | zero_flag);
2220                 if (!page)
2221                         goto out;
2222
2223                 sg_set_page(&sg[i], page, page_len, 0);
2224                 length -= page_len;
2225                 i++;
2226         }
2227         *sgl = sg;
2228         *nents = nent;
2229         return 0;
2230
2231 out:
2232         while (i > 0) {
2233                 i--;
2234                 __free_page(sg_page(&sg[i]));
2235         }
2236         kfree(sg);
2237         return -ENOMEM;
2238 }
2239
2240 /*
2241  * Allocate any required resources to execute the command.  For writes we
2242  * might not have the payload yet, so notify the fabric via a call to
2243  * ->write_pending instead. Otherwise place it on the execution queue.
2244  */
2245 sense_reason_t
2246 transport_generic_new_cmd(struct se_cmd *cmd)
2247 {
2248         int ret = 0;
2249
2250         /*
2251          * Determine is the TCM fabric module has already allocated physical
2252          * memory, and is directly calling transport_generic_map_mem_to_cmd()
2253          * beforehand.
2254          */
2255         if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2256             cmd->data_length) {
2257                 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
2258
2259                 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2260                     (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2261                         u32 bidi_length;
2262
2263                         if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2264                                 bidi_length = cmd->t_task_nolb *
2265                                               cmd->se_dev->dev_attrib.block_size;
2266                         else
2267                                 bidi_length = cmd->data_length;
2268
2269                         ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2270                                                &cmd->t_bidi_data_nents,
2271                                                bidi_length, zero_flag);
2272                         if (ret < 0)
2273                                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2274                 }
2275
2276                 if (cmd->prot_op != TARGET_PROT_NORMAL) {
2277                         ret = target_alloc_sgl(&cmd->t_prot_sg,
2278                                                &cmd->t_prot_nents,
2279                                                cmd->prot_length, true);
2280                         if (ret < 0)
2281                                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2282                 }
2283
2284                 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2285                                        cmd->data_length, zero_flag);
2286                 if (ret < 0)
2287                         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2288         }
2289         /*
2290          * If this command is not a write we can execute it right here,
2291          * for write buffers we need to notify the fabric driver first
2292          * and let it call back once the write buffers are ready.
2293          */
2294         target_add_to_state_list(cmd);
2295         if (cmd->data_direction != DMA_TO_DEVICE) {
2296                 target_execute_cmd(cmd);
2297                 return 0;
2298         }
2299         transport_cmd_check_stop(cmd, false, true);
2300
2301         ret = cmd->se_tfo->write_pending(cmd);
2302         if (ret == -EAGAIN || ret == -ENOMEM)
2303                 goto queue_full;
2304
2305         /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2306         WARN_ON(ret);
2307
2308         return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2309
2310 queue_full:
2311         pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2312         cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2313         transport_handle_queue_full(cmd, cmd->se_dev);
2314         return 0;
2315 }
2316 EXPORT_SYMBOL(transport_generic_new_cmd);
2317
2318 static void transport_write_pending_qf(struct se_cmd *cmd)
2319 {
2320         int ret;
2321
2322         ret = cmd->se_tfo->write_pending(cmd);
2323         if (ret == -EAGAIN || ret == -ENOMEM) {
2324                 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2325                          cmd);
2326                 transport_handle_queue_full(cmd, cmd->se_dev);
2327         }
2328 }
2329
2330 int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2331 {
2332         unsigned long flags;
2333         int ret = 0;
2334
2335         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2336                 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2337                          transport_wait_for_tasks(cmd);
2338
2339                 ret = transport_release_cmd(cmd);
2340         } else {
2341                 if (wait_for_tasks)
2342                         transport_wait_for_tasks(cmd);
2343                 /*
2344                  * Handle WRITE failure case where transport_generic_new_cmd()
2345                  * has already added se_cmd to state_list, but fabric has
2346                  * failed command before I/O submission.
2347                  */
2348                 if (cmd->state_active) {
2349                         spin_lock_irqsave(&cmd->t_state_lock, flags);
2350                         target_remove_from_state_list(cmd);
2351                         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2352                 }
2353
2354                 if (cmd->se_lun)
2355                         transport_lun_remove_cmd(cmd);
2356
2357                 ret = transport_put_cmd(cmd);
2358         }
2359         return ret;
2360 }
2361 EXPORT_SYMBOL(transport_generic_free_cmd);
2362
2363 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2364  * @se_sess:    session to reference
2365  * @se_cmd:     command descriptor to add
2366  * @ack_kref:   Signal that fabric will perform an ack target_put_sess_cmd()
2367  */
2368 int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2369                                bool ack_kref)
2370 {
2371         unsigned long flags;
2372         int ret = 0;
2373
2374         /*
2375          * Add a second kref if the fabric caller is expecting to handle
2376          * fabric acknowledgement that requires two target_put_sess_cmd()
2377          * invocations before se_cmd descriptor release.
2378          */
2379         if (ack_kref) {
2380                 kref_get(&se_cmd->cmd_kref);
2381                 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2382         }
2383
2384         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2385         if (se_sess->sess_tearing_down) {
2386                 ret = -ESHUTDOWN;
2387                 goto out;
2388         }
2389         list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2390 out:
2391         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2392         return ret;
2393 }
2394 EXPORT_SYMBOL(target_get_sess_cmd);
2395
2396 static void target_release_cmd_kref(struct kref *kref)
2397 {
2398         struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2399         struct se_session *se_sess = se_cmd->se_sess;
2400
2401         if (list_empty(&se_cmd->se_cmd_list)) {
2402                 spin_unlock(&se_sess->sess_cmd_lock);
2403                 se_cmd->se_tfo->release_cmd(se_cmd);
2404                 return;
2405         }
2406         if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2407                 spin_unlock(&se_sess->sess_cmd_lock);
2408                 complete(&se_cmd->cmd_wait_comp);
2409                 return;
2410         }
2411         list_del(&se_cmd->se_cmd_list);
2412         spin_unlock(&se_sess->sess_cmd_lock);
2413
2414         se_cmd->se_tfo->release_cmd(se_cmd);
2415 }
2416
2417 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2418  * @se_sess:    session to reference
2419  * @se_cmd:     command descriptor to drop
2420  */
2421 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2422 {
2423         if (!se_sess) {
2424                 se_cmd->se_tfo->release_cmd(se_cmd);
2425                 return 1;
2426         }
2427         return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2428                         &se_sess->sess_cmd_lock);
2429 }
2430 EXPORT_SYMBOL(target_put_sess_cmd);
2431
2432 /* target_sess_cmd_list_set_waiting - Flag all commands in
2433  *         sess_cmd_list to complete cmd_wait_comp.  Set
2434  *         sess_tearing_down so no more commands are queued.
2435  * @se_sess:    session to flag
2436  */
2437 void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
2438 {
2439         struct se_cmd *se_cmd;
2440         unsigned long flags;
2441
2442         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2443         if (se_sess->sess_tearing_down) {
2444                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2445                 return;
2446         }
2447         se_sess->sess_tearing_down = 1;
2448         list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
2449
2450         list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
2451                 se_cmd->cmd_wait_set = 1;
2452
2453         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2454 }
2455 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
2456
2457 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2458  * @se_sess:    session to wait for active I/O
2459  */
2460 void target_wait_for_sess_cmds(struct se_session *se_sess)
2461 {
2462         struct se_cmd *se_cmd, *tmp_cmd;
2463         unsigned long flags;
2464
2465         list_for_each_entry_safe(se_cmd, tmp_cmd,
2466                                 &se_sess->sess_wait_list, se_cmd_list) {
2467                 list_del(&se_cmd->se_cmd_list);
2468
2469                 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2470                         " %d\n", se_cmd, se_cmd->t_state,
2471                         se_cmd->se_tfo->get_cmd_state(se_cmd));
2472
2473                 wait_for_completion(&se_cmd->cmd_wait_comp);
2474                 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2475                         " fabric state: %d\n", se_cmd, se_cmd->t_state,
2476                         se_cmd->se_tfo->get_cmd_state(se_cmd));
2477
2478                 se_cmd->se_tfo->release_cmd(se_cmd);
2479         }
2480
2481         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2482         WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2483         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2484
2485 }
2486 EXPORT_SYMBOL(target_wait_for_sess_cmds);
2487
2488 static int transport_clear_lun_ref_thread(void *p)
2489 {
2490         struct se_lun *lun = p;
2491
2492         percpu_ref_kill(&lun->lun_ref);
2493
2494         wait_for_completion(&lun->lun_ref_comp);
2495         complete(&lun->lun_shutdown_comp);
2496
2497         return 0;
2498 }
2499
2500 int transport_clear_lun_ref(struct se_lun *lun)
2501 {
2502         struct task_struct *kt;
2503
2504         kt = kthread_run(transport_clear_lun_ref_thread, lun,
2505                         "tcm_cl_%u", lun->unpacked_lun);
2506         if (IS_ERR(kt)) {
2507                 pr_err("Unable to start clear_lun thread\n");
2508                 return PTR_ERR(kt);
2509         }
2510         wait_for_completion(&lun->lun_shutdown_comp);
2511
2512         return 0;
2513 }
2514
2515 /**
2516  * transport_wait_for_tasks - wait for completion to occur
2517  * @cmd:        command to wait
2518  *
2519  * Called from frontend fabric context to wait for storage engine
2520  * to pause and/or release frontend generated struct se_cmd.
2521  */
2522 bool transport_wait_for_tasks(struct se_cmd *cmd)
2523 {
2524         unsigned long flags;
2525
2526         spin_lock_irqsave(&cmd->t_state_lock, flags);
2527         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2528             !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2529                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2530                 return false;
2531         }
2532
2533         if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2534             !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2535                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2536                 return false;
2537         }
2538
2539         if (!(cmd->transport_state & CMD_T_ACTIVE)) {
2540                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2541                 return false;
2542         }
2543
2544         cmd->transport_state |= CMD_T_STOP;
2545
2546         pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2547                 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2548                 cmd, cmd->se_tfo->get_task_tag(cmd),
2549                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2550
2551         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2552
2553         wait_for_completion(&cmd->t_transport_stop_comp);
2554
2555         spin_lock_irqsave(&cmd->t_state_lock, flags);
2556         cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2557
2558         pr_debug("wait_for_tasks: Stopped wait_for_completion("
2559                 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2560                 cmd->se_tfo->get_task_tag(cmd));
2561
2562         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2563
2564         return true;
2565 }
2566 EXPORT_SYMBOL(transport_wait_for_tasks);
2567
2568 static int transport_get_sense_codes(
2569         struct se_cmd *cmd,
2570         u8 *asc,
2571         u8 *ascq)
2572 {
2573         *asc = cmd->scsi_asc;
2574         *ascq = cmd->scsi_ascq;
2575
2576         return 0;
2577 }
2578
2579 static
2580 void transport_err_sector_info(unsigned char *buffer, sector_t bad_sector)
2581 {
2582         /* Place failed LBA in sense data information descriptor 0. */
2583         buffer[SPC_ADD_SENSE_LEN_OFFSET] = 0xc;
2584         buffer[SPC_DESC_TYPE_OFFSET] = 0; /* Information */
2585         buffer[SPC_ADDITIONAL_DESC_LEN_OFFSET] = 0xa;
2586         buffer[SPC_VALIDITY_OFFSET] = 0x80;
2587
2588         /* Descriptor Information: failing sector */
2589         put_unaligned_be64(bad_sector, &buffer[12]);
2590 }
2591
2592 int
2593 transport_send_check_condition_and_sense(struct se_cmd *cmd,
2594                 sense_reason_t reason, int from_transport)
2595 {
2596         unsigned char *buffer = cmd->sense_buffer;
2597         unsigned long flags;
2598         u8 asc = 0, ascq = 0;
2599
2600         spin_lock_irqsave(&cmd->t_state_lock, flags);
2601         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2602                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2603                 return 0;
2604         }
2605         cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
2606         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2607
2608         if (!reason && from_transport)
2609                 goto after_reason;
2610
2611         if (!from_transport)
2612                 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2613
2614         /*
2615          * Actual SENSE DATA, see SPC-3 7.23.2  SPC_SENSE_KEY_OFFSET uses
2616          * SENSE KEY values from include/scsi/scsi.h
2617          */
2618         switch (reason) {
2619         case TCM_NO_SENSE:
2620                 /* CURRENT ERROR */
2621                 buffer[0] = 0x70;
2622                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2623                 /* Not Ready */
2624                 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2625                 /* NO ADDITIONAL SENSE INFORMATION */
2626                 buffer[SPC_ASC_KEY_OFFSET] = 0;
2627                 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2628                 break;
2629         case TCM_NON_EXISTENT_LUN:
2630                 /* CURRENT ERROR */
2631                 buffer[0] = 0x70;
2632                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2633                 /* ILLEGAL REQUEST */
2634                 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2635                 /* LOGICAL UNIT NOT SUPPORTED */
2636                 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
2637                 break;
2638         case TCM_UNSUPPORTED_SCSI_OPCODE:
2639         case TCM_SECTOR_COUNT_TOO_MANY:
2640                 /* CURRENT ERROR */
2641                 buffer[0] = 0x70;
2642                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2643                 /* ILLEGAL REQUEST */
2644                 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2645                 /* INVALID COMMAND OPERATION CODE */
2646                 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
2647                 break;
2648         case TCM_UNKNOWN_MODE_PAGE:
2649                 /* CURRENT ERROR */
2650                 buffer[0] = 0x70;
2651                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2652                 /* ILLEGAL REQUEST */
2653                 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2654                 /* INVALID FIELD IN CDB */
2655                 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2656                 break;
2657         case TCM_CHECK_CONDITION_ABORT_CMD:
2658                 /* CURRENT ERROR */
2659                 buffer[0] = 0x70;
2660                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2661                 /* ABORTED COMMAND */
2662                 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2663                 /* BUS DEVICE RESET FUNCTION OCCURRED */
2664                 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2665                 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
2666                 break;
2667         case TCM_INCORRECT_AMOUNT_OF_DATA:
2668                 /* CURRENT ERROR */
2669                 buffer[0] = 0x70;
2670                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2671                 /* ABORTED COMMAND */
2672                 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2673                 /* WRITE ERROR */
2674                 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2675                 /* NOT ENOUGH UNSOLICITED DATA */
2676                 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
2677                 break;
2678         case TCM_INVALID_CDB_FIELD:
2679                 /* CURRENT ERROR */
2680                 buffer[0] = 0x70;
2681                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2682                 /* ILLEGAL REQUEST */
2683                 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2684                 /* INVALID FIELD IN CDB */
2685                 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2686                 break;
2687         case TCM_INVALID_PARAMETER_LIST:
2688                 /* CURRENT ERROR */
2689                 buffer[0] = 0x70;
2690                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2691                 /* ILLEGAL REQUEST */
2692                 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2693                 /* INVALID FIELD IN PARAMETER LIST */
2694                 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
2695                 break;
2696         case TCM_PARAMETER_LIST_LENGTH_ERROR:
2697                 /* CURRENT ERROR */
2698                 buffer[0] = 0x70;
2699                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2700                 /* ILLEGAL REQUEST */
2701                 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2702                 /* PARAMETER LIST LENGTH ERROR */
2703                 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2704                 break;
2705         case TCM_UNEXPECTED_UNSOLICITED_DATA:
2706                 /* CURRENT ERROR */
2707                 buffer[0] = 0x70;
2708                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2709                 /* ABORTED COMMAND */
2710                 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2711                 /* WRITE ERROR */
2712                 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2713                 /* UNEXPECTED_UNSOLICITED_DATA */
2714                 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
2715                 break;
2716         case TCM_SERVICE_CRC_ERROR:
2717                 /* CURRENT ERROR */
2718                 buffer[0] = 0x70;
2719                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2720                 /* ABORTED COMMAND */
2721                 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2722                 /* PROTOCOL SERVICE CRC ERROR */
2723                 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
2724                 /* N/A */
2725                 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
2726                 break;
2727         case TCM_SNACK_REJECTED:
2728                 /* CURRENT ERROR */
2729                 buffer[0] = 0x70;
2730                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2731                 /* ABORTED COMMAND */
2732                 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2733                 /* READ ERROR */
2734                 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
2735                 /* FAILED RETRANSMISSION REQUEST */
2736                 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
2737                 break;
2738         case TCM_WRITE_PROTECTED:
2739                 /* CURRENT ERROR */
2740                 buffer[0] = 0x70;
2741                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2742                 /* DATA PROTECT */
2743                 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
2744                 /* WRITE PROTECTED */
2745                 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
2746                 break;
2747         case TCM_ADDRESS_OUT_OF_RANGE:
2748                 /* CURRENT ERROR */
2749                 buffer[0] = 0x70;
2750                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2751                 /* ILLEGAL REQUEST */
2752                 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2753                 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2754                 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
2755                 break;
2756         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2757                 /* CURRENT ERROR */
2758                 buffer[0] = 0x70;
2759                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2760                 /* UNIT ATTENTION */
2761                 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
2762                 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2763                 buffer[SPC_ASC_KEY_OFFSET] = asc;
2764                 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
2765                 break;
2766         case TCM_CHECK_CONDITION_NOT_READY:
2767                 /* CURRENT ERROR */
2768                 buffer[0] = 0x70;
2769                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2770                 /* Not Ready */
2771                 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2772                 transport_get_sense_codes(cmd, &asc, &ascq);
2773                 buffer[SPC_ASC_KEY_OFFSET] = asc;
2774                 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
2775                 break;
2776         case TCM_MISCOMPARE_VERIFY:
2777                 /* CURRENT ERROR */
2778                 buffer[0] = 0x70;
2779                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2780                 buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE;
2781                 /* MISCOMPARE DURING VERIFY OPERATION */
2782                 buffer[SPC_ASC_KEY_OFFSET] = 0x1d;
2783                 buffer[SPC_ASCQ_KEY_OFFSET] = 0x00;
2784                 break;
2785         case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
2786                 /* CURRENT ERROR */
2787                 buffer[0] = 0x70;
2788                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2789                 /* ILLEGAL REQUEST */
2790                 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2791                 /* LOGICAL BLOCK GUARD CHECK FAILED */
2792                 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2793                 buffer[SPC_ASCQ_KEY_OFFSET] = 0x01;
2794                 transport_err_sector_info(buffer, cmd->bad_sector);
2795                 break;
2796         case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
2797                 /* CURRENT ERROR */
2798                 buffer[0] = 0x70;
2799                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2800                 /* ILLEGAL REQUEST */
2801                 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2802                 /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2803                 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2804                 buffer[SPC_ASCQ_KEY_OFFSET] = 0x02;
2805                 transport_err_sector_info(buffer, cmd->bad_sector);
2806                 break;
2807         case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
2808                 /* CURRENT ERROR */
2809                 buffer[0] = 0x70;
2810                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2811                 /* ILLEGAL REQUEST */
2812                 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2813                 /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2814                 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2815                 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
2816                 transport_err_sector_info(buffer, cmd->bad_sector);
2817                 break;
2818         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2819         default:
2820                 /* CURRENT ERROR */
2821                 buffer[0] = 0x70;
2822                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2823                 /*
2824                  * Returning ILLEGAL REQUEST would cause immediate IO errors on
2825                  * Solaris initiators.  Returning NOT READY instead means the
2826                  * operations will be retried a finite number of times and we
2827                  * can survive intermittent errors.
2828                  */
2829                 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2830                 /* LOGICAL UNIT COMMUNICATION FAILURE */
2831                 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
2832                 break;
2833         }
2834         /*
2835          * This code uses linux/include/scsi/scsi.h SAM status codes!
2836          */
2837         cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2838         /*
2839          * Automatically padded, this value is encoded in the fabric's
2840          * data_length response PDU containing the SCSI defined sense data.
2841          */
2842         cmd->scsi_sense_length  = TRANSPORT_SENSE_BUFFER;
2843
2844 after_reason:
2845         trace_target_cmd_complete(cmd);
2846         return cmd->se_tfo->queue_status(cmd);
2847 }
2848 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2849
2850 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2851 {
2852         if (!(cmd->transport_state & CMD_T_ABORTED))
2853                 return 0;
2854
2855         /*
2856          * If cmd has been aborted but either no status is to be sent or it has
2857          * already been sent, just return
2858          */
2859         if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS))
2860                 return 1;
2861
2862         pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2863                  cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
2864
2865         cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
2866         cmd->scsi_status = SAM_STAT_TASK_ABORTED;
2867         trace_target_cmd_complete(cmd);
2868         cmd->se_tfo->queue_status(cmd);
2869
2870         return 1;
2871 }
2872 EXPORT_SYMBOL(transport_check_aborted_status);
2873
2874 void transport_send_task_abort(struct se_cmd *cmd)
2875 {
2876         unsigned long flags;
2877
2878         spin_lock_irqsave(&cmd->t_state_lock, flags);
2879         if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
2880                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2881                 return;
2882         }
2883         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2884
2885         /*
2886          * If there are still expected incoming fabric WRITEs, we wait
2887          * until until they have completed before sending a TASK_ABORTED
2888          * response.  This response with TASK_ABORTED status will be
2889          * queued back to fabric module by transport_check_aborted_status().
2890          */
2891         if (cmd->data_direction == DMA_TO_DEVICE) {
2892                 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
2893                         cmd->transport_state |= CMD_T_ABORTED;
2894                         cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
2895                         return;
2896                 }
2897         }
2898         cmd->scsi_status = SAM_STAT_TASK_ABORTED;
2899
2900         transport_lun_remove_cmd(cmd);
2901
2902         pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
2903                 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
2904                 cmd->se_tfo->get_task_tag(cmd));
2905
2906         trace_target_cmd_complete(cmd);
2907         cmd->se_tfo->queue_status(cmd);
2908 }
2909
2910 static void target_tmr_work(struct work_struct *work)
2911 {
2912         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
2913         struct se_device *dev = cmd->se_dev;
2914         struct se_tmr_req *tmr = cmd->se_tmr_req;
2915         int ret;
2916
2917         switch (tmr->function) {
2918         case TMR_ABORT_TASK:
2919                 core_tmr_abort_task(dev, tmr, cmd->se_sess);
2920                 break;
2921         case TMR_ABORT_TASK_SET:
2922         case TMR_CLEAR_ACA:
2923         case TMR_CLEAR_TASK_SET:
2924                 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2925                 break;
2926         case TMR_LUN_RESET:
2927                 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2928                 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2929                                          TMR_FUNCTION_REJECTED;
2930                 break;
2931         case TMR_TARGET_WARM_RESET:
2932                 tmr->response = TMR_FUNCTION_REJECTED;
2933                 break;
2934         case TMR_TARGET_COLD_RESET:
2935                 tmr->response = TMR_FUNCTION_REJECTED;
2936                 break;
2937         default:
2938                 pr_err("Uknown TMR function: 0x%02x.\n",
2939                                 tmr->function);
2940                 tmr->response = TMR_FUNCTION_REJECTED;
2941                 break;
2942         }
2943
2944         cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
2945         cmd->se_tfo->queue_tm_rsp(cmd);
2946
2947         transport_cmd_check_stop_to_fabric(cmd);
2948 }
2949
2950 int transport_generic_handle_tmr(
2951         struct se_cmd *cmd)
2952 {
2953         unsigned long flags;
2954
2955         spin_lock_irqsave(&cmd->t_state_lock, flags);
2956         cmd->transport_state |= CMD_T_ACTIVE;
2957         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2958
2959         INIT_WORK(&cmd->work, target_tmr_work);
2960         queue_work(cmd->se_dev->tmr_wq, &cmd->work);
2961         return 0;
2962 }
2963 EXPORT_SYMBOL(transport_generic_handle_tmr);