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target: Improve system responsivity during I/O
[deliverable/linux.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 *
27 ******************************************************************************/
28
c66ac9db
NB		 29#include <linux/net.h>
30#include <linux/delay.h>
31#include <linux/string.h>
32#include <linux/timer.h>
33#include <linux/slab.h>
34#include <linux/blkdev.h>
35#include <linux/spinlock.h>
c66ac9db
NB		 36#include <linux/kthread.h>
37#include <linux/in.h>
38#include <linux/cdrom.h>
827509e3 39#include <linux/module.h>
c66ac9db
NB		 40#include <asm/unaligned.h>
41#include <net/sock.h>
42#include <net/tcp.h>
43#include <scsi/scsi.h>
44#include <scsi/scsi_cmnd.h>
e66ecd50 45#include <scsi/scsi_tcq.h>
c66ac9db
NB		 46
47#include <target/target_core_base.h>
48#include <target/target_core_device.h>
49#include <target/target_core_tmr.h>
50#include <target/target_core_tpg.h>
51#include <target/target_core_transport.h>
52#include <target/target_core_fabric_ops.h>
53#include <target/target_core_configfs.h>
54
55#include "target_core_alua.h"
5bda90c8 56#include "target_core_cdb.h"
c66ac9db
NB		 57#include "target_core_hba.h"
58#include "target_core_pr.h"
c66ac9db
NB		 59#include "target_core_ua.h"
60
e3d6f909 61static int sub_api_initialized;
c66ac9db 62
35e0e757 63static struct workqueue_struct *target_completion_wq;
c66ac9db
NB		 64static struct kmem_cache *se_cmd_cache;
65static struct kmem_cache *se_sess_cache;
66struct kmem_cache *se_tmr_req_cache;
67struct kmem_cache *se_ua_cache;
c66ac9db
NB		 68struct kmem_cache *t10_pr_reg_cache;
69struct kmem_cache *t10_alua_lu_gp_cache;
70struct kmem_cache *t10_alua_lu_gp_mem_cache;
71struct kmem_cache *t10_alua_tg_pt_gp_cache;
72struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
73
c66ac9db 74static int transport_generic_write_pending(struct se_cmd *);
5951146d 75static int transport_processing_thread(void *param);
c66ac9db
NB		 76static int __transport_execute_tasks(struct se_device *dev);
77static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 78static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 79 struct se_device *dev);
c66ac9db 80static void transport_free_dev_tasks(struct se_cmd *cmd);
05d1c7c0 81static int transport_generic_get_mem(struct se_cmd *cmd);
39c05f32 82static void transport_put_cmd(struct se_cmd *cmd);
3df8d40b 83static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
c66ac9db 84static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
03e98c9e 85static void transport_generic_request_failure(struct se_cmd *);
35e0e757 86static void target_complete_ok_work(struct work_struct *work);
c66ac9db 87
e3d6f909 88int init_se_kmem_caches(void)
c66ac9db 89{
c66ac9db
NB		 90 se_cmd_cache = kmem_cache_create("se_cmd_cache",
91 sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
6708bb27
AG		 92 if (!se_cmd_cache) {
93 pr_err("kmem_cache_create for struct se_cmd failed\n");
c66ac9db
NB		 94 goto out;
95 }
96 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
97 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
98 0, NULL);
6708bb27
AG		 99 if (!se_tmr_req_cache) {
100 pr_err("kmem_cache_create() for struct se_tmr_req"
c66ac9db 101 " failed\n");
35e0e757 102 goto out_free_cmd_cache;
c66ac9db
NB		 103 }
104 se_sess_cache = kmem_cache_create("se_sess_cache",
105 sizeof(struct se_session), __alignof__(struct se_session),
106 0, NULL);
6708bb27
AG		 107 if (!se_sess_cache) {
108 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 109 " failed\n");
35e0e757 110 goto out_free_tmr_req_cache;
c66ac9db
NB		 111 }
112 se_ua_cache = kmem_cache_create("se_ua_cache",
113 sizeof(struct se_ua), __alignof__(struct se_ua),
114 0, NULL);
6708bb27
AG		 115 if (!se_ua_cache) {
116 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 117 goto out_free_sess_cache;
c66ac9db 118 }
c66ac9db
NB		 119 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
120 sizeof(struct t10_pr_registration),
121 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 122 if (!t10_pr_reg_cache) {
123 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 124 " failed\n");
35e0e757 125 goto out_free_ua_cache;
c66ac9db
NB		 126 }
127 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
128 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
129 0, NULL);
6708bb27
AG		 130 if (!t10_alua_lu_gp_cache) {
131 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 132 " failed\n");
35e0e757 133 goto out_free_pr_reg_cache;
c66ac9db
NB		 134 }
135 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
136 sizeof(struct t10_alua_lu_gp_member),
137 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 138 if (!t10_alua_lu_gp_mem_cache) {
139 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 140 "cache failed\n");
35e0e757 141 goto out_free_lu_gp_cache;
c66ac9db
NB		 142 }
143 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
144 sizeof(struct t10_alua_tg_pt_gp),
145 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 146 if (!t10_alua_tg_pt_gp_cache) {
147 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 148 "cache failed\n");
35e0e757 149 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 150 }
151 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
152 "t10_alua_tg_pt_gp_mem_cache",
153 sizeof(struct t10_alua_tg_pt_gp_member),
154 __alignof__(struct t10_alua_tg_pt_gp_member),
155 0, NULL);
6708bb27
AG		 156 if (!t10_alua_tg_pt_gp_mem_cache) {
157 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 158 "mem_t failed\n");
35e0e757 159 goto out_free_tg_pt_gp_cache;
c66ac9db
NB		 160 }
161
35e0e757
CH		 162 target_completion_wq = alloc_workqueue("target_completion",
163 WQ_MEM_RECLAIM, 0);
164 if (!target_completion_wq)
165 goto out_free_tg_pt_gp_mem_cache;
166
c66ac9db 167 return 0;
35e0e757
CH		 168
169out_free_tg_pt_gp_mem_cache:
170 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
171out_free_tg_pt_gp_cache:
172 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
173out_free_lu_gp_mem_cache:
174 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
175out_free_lu_gp_cache:
176 kmem_cache_destroy(t10_alua_lu_gp_cache);
177out_free_pr_reg_cache:
178 kmem_cache_destroy(t10_pr_reg_cache);
179out_free_ua_cache:
180 kmem_cache_destroy(se_ua_cache);
181out_free_sess_cache:
182 kmem_cache_destroy(se_sess_cache);
183out_free_tmr_req_cache:
184 kmem_cache_destroy(se_tmr_req_cache);
185out_free_cmd_cache:
186 kmem_cache_destroy(se_cmd_cache);
c66ac9db 187out:
e3d6f909 188 return -ENOMEM;
c66ac9db
NB		 189}
190
e3d6f909 191void release_se_kmem_caches(void)
c66ac9db 192{
35e0e757 193 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 194 kmem_cache_destroy(se_cmd_cache);
195 kmem_cache_destroy(se_tmr_req_cache);
196 kmem_cache_destroy(se_sess_cache);
197 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 198 kmem_cache_destroy(t10_pr_reg_cache);
199 kmem_cache_destroy(t10_alua_lu_gp_cache);
200 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
201 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
202 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 203}
204
e3d6f909
AG		 205/* This code ensures unique mib indexes are handed out. */
206static DEFINE_SPINLOCK(scsi_mib_index_lock);
207static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 208
209/*
210 * Allocate a new row index for the entry type specified
211 */
212u32 scsi_get_new_index(scsi_index_t type)
213{
214 u32 new_index;
215
e3d6f909 216 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 217
e3d6f909
AG		 218 spin_lock(&scsi_mib_index_lock);
219 new_index = ++scsi_mib_index[type];
220 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 221
222 return new_index;
223}
224
c66ac9db
NB		 225void transport_init_queue_obj(struct se_queue_obj *qobj)
226{
227 atomic_set(&qobj->queue_cnt, 0);
228 INIT_LIST_HEAD(&qobj->qobj_list);
229 init_waitqueue_head(&qobj->thread_wq);
230 spin_lock_init(&qobj->cmd_queue_lock);
231}
232EXPORT_SYMBOL(transport_init_queue_obj);
233
dbc5623e 234void transport_subsystem_check_init(void)
c66ac9db
NB		 235{
236 int ret;
237
dbc5623e
NB		 238 if (sub_api_initialized)
239 return;
240
c66ac9db
NB		 241 ret = request_module("target_core_iblock");
242 if (ret != 0)
6708bb27 243 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 244
245 ret = request_module("target_core_file");
246 if (ret != 0)
6708bb27 247 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 248
249 ret = request_module("target_core_pscsi");
250 if (ret != 0)
6708bb27 251 pr_err("Unable to load target_core_pscsi\n");
c66ac9db
NB		 252
253 ret = request_module("target_core_stgt");
254 if (ret != 0)
6708bb27 255 pr_err("Unable to load target_core_stgt\n");
c66ac9db 256
e3d6f909 257 sub_api_initialized = 1;
dbc5623e 258 return;
c66ac9db
NB		 259}
260
261struct se_session *transport_init_session(void)
262{
263 struct se_session *se_sess;
264
265 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 266 if (!se_sess) {
267 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 268 " se_sess_cache\n");
269 return ERR_PTR(-ENOMEM);
270 }
271 INIT_LIST_HEAD(&se_sess->sess_list);
272 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d
NB		 273 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
274 INIT_LIST_HEAD(&se_sess->sess_wait_list);
275 spin_lock_init(&se_sess->sess_cmd_lock);
c66ac9db
NB		 276
277 return se_sess;
278}
279EXPORT_SYMBOL(transport_init_session);
280
281/*
282 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
283 */
284void __transport_register_session(
285 struct se_portal_group *se_tpg,
286 struct se_node_acl *se_nacl,
287 struct se_session *se_sess,
288 void *fabric_sess_ptr)
289{
290 unsigned char buf[PR_REG_ISID_LEN];
291
292 se_sess->se_tpg = se_tpg;
293 se_sess->fabric_sess_ptr = fabric_sess_ptr;
294 /*
295 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
296 *
297 * Only set for struct se_session's that will actually be moving I/O.
298 * eg: *NOT* discovery sessions.
299 */
300 if (se_nacl) {
301 /*
302 * If the fabric module supports an ISID based TransportID,
303 * save this value in binary from the fabric I_T Nexus now.
304 */
e3d6f909 305 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 306 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 307 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 308 &buf[0], PR_REG_ISID_LEN);
309 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
310 }
311 spin_lock_irq(&se_nacl->nacl_sess_lock);
312 /*
313 * The se_nacl->nacl_sess pointer will be set to the
314 * last active I_T Nexus for each struct se_node_acl.
315 */
316 se_nacl->nacl_sess = se_sess;
317
318 list_add_tail(&se_sess->sess_acl_list,
319 &se_nacl->acl_sess_list);
320 spin_unlock_irq(&se_nacl->nacl_sess_lock);
321 }
322 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
323
6708bb27 324 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 325 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 326}
327EXPORT_SYMBOL(__transport_register_session);
328
329void transport_register_session(
330 struct se_portal_group *se_tpg,
331 struct se_node_acl *se_nacl,
332 struct se_session *se_sess,
333 void *fabric_sess_ptr)
334{
335 spin_lock_bh(&se_tpg->session_lock);
336 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
337 spin_unlock_bh(&se_tpg->session_lock);
338}
339EXPORT_SYMBOL(transport_register_session);
340
341void transport_deregister_session_configfs(struct se_session *se_sess)
342{
343 struct se_node_acl *se_nacl;
23388864 344 unsigned long flags;
c66ac9db
NB		 345 /*
346 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
347 */
348 se_nacl = se_sess->se_node_acl;
6708bb27 349 if (se_nacl) {
23388864 350 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 351 list_del(&se_sess->sess_acl_list);
352 /*
353 * If the session list is empty, then clear the pointer.
354 * Otherwise, set the struct se_session pointer from the tail
355 * element of the per struct se_node_acl active session list.
356 */
357 if (list_empty(&se_nacl->acl_sess_list))
358 se_nacl->nacl_sess = NULL;
359 else {
360 se_nacl->nacl_sess = container_of(
361 se_nacl->acl_sess_list.prev,
362 struct se_session, sess_acl_list);
363 }
23388864 364 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 365 }
366}
367EXPORT_SYMBOL(transport_deregister_session_configfs);
368
369void transport_free_session(struct se_session *se_sess)
370{
371 kmem_cache_free(se_sess_cache, se_sess);
372}
373EXPORT_SYMBOL(transport_free_session);
374
375void transport_deregister_session(struct se_session *se_sess)
376{
377 struct se_portal_group *se_tpg = se_sess->se_tpg;
378 struct se_node_acl *se_nacl;
e63a8e19 379 unsigned long flags;
c66ac9db 380
6708bb27 381 if (!se_tpg) {
c66ac9db
NB		 382 transport_free_session(se_sess);
383 return;
384 }
c66ac9db 385
e63a8e19 386 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 387 list_del(&se_sess->sess_list);
388 se_sess->se_tpg = NULL;
389 se_sess->fabric_sess_ptr = NULL;
e63a8e19 390 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 391
392 /*
393 * Determine if we need to do extra work for this initiator node's
394 * struct se_node_acl if it had been previously dynamically generated.
395 */
396 se_nacl = se_sess->se_node_acl;
6708bb27 397 if (se_nacl) {
e63a8e19 398 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 399 if (se_nacl->dynamic_node_acl) {
6708bb27
AG		 400 if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
401 se_tpg)) {
c66ac9db
NB		 402 list_del(&se_nacl->acl_list);
403 se_tpg->num_node_acls--;
e63a8e19 404 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 405
406 core_tpg_wait_for_nacl_pr_ref(se_nacl);
c66ac9db 407 core_free_device_list_for_node(se_nacl, se_tpg);
e3d6f909 408 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
c66ac9db 409 se_nacl);
e63a8e19 410 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 411 }
412 }
e63a8e19 413 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 414 }
415
416 transport_free_session(se_sess);
417
6708bb27 418 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 419 se_tpg->se_tpg_tfo->get_fabric_name());
c66ac9db
NB		 420}
421EXPORT_SYMBOL(transport_deregister_session);
422
423/*
a1d8b49a 424 * Called with cmd->t_state_lock held.
c66ac9db
NB		 425 */
426static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
427{
42bf829e 428 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 429 struct se_task *task;
430 unsigned long flags;
431
42bf829e
CH		 432 if (!dev)
433 return;
c66ac9db 434
42bf829e 435 list_for_each_entry(task, &cmd->t_task_list, t_list) {
6c76bf95 436 if (task->task_flags & TF_ACTIVE)
c66ac9db
NB		 437 continue;
438
6708bb27 439 if (!atomic_read(&task->task_state_active))
c66ac9db
NB		 440 continue;
441
442 spin_lock_irqsave(&dev->execute_task_lock, flags);
443 list_del(&task->t_state_list);
6708bb27
AG		 444 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
445 cmd->se_tfo->get_task_tag(cmd), dev, task);
c66ac9db
NB		 446 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
447
448 atomic_set(&task->task_state_active, 0);
a1d8b49a 449 atomic_dec(&cmd->t_task_cdbs_ex_left);
c66ac9db
NB		 450 }
451}
452
453/* transport_cmd_check_stop():
454 *
455 * 'transport_off = 1' determines if t_transport_active should be cleared.
456 * 'transport_off = 2' determines if task_dev_state should be removed.
457 *
458 * A non-zero u8 t_state sets cmd->t_state.
459 * Returns 1 when command is stopped, else 0.
460 */
461static int transport_cmd_check_stop(
462 struct se_cmd *cmd,
463 int transport_off,
464 u8 t_state)
465{
466 unsigned long flags;
467
a1d8b49a 468 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 469 /*
470 * Determine if IOCTL context caller in requesting the stopping of this
471 * command for LUN shutdown purposes.
472 */
a1d8b49a 473 if (atomic_read(&cmd->transport_lun_stop)) {
6708bb27 474 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
c66ac9db 475 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 476 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 477
a1d8b49a 478 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 479 if (transport_off == 2)
480 transport_all_task_dev_remove_state(cmd);
a1d8b49a 481 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 482
a1d8b49a 483 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 484 return 1;
485 }
486 /*
487 * Determine if frontend context caller is requesting the stopping of
e3d6f909 488 * this command for frontend exceptions.
c66ac9db 489 */
a1d8b49a 490 if (atomic_read(&cmd->t_transport_stop)) {
6708bb27 491 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
c66ac9db 492 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 493 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 494
c66ac9db
NB		 495 if (transport_off == 2)
496 transport_all_task_dev_remove_state(cmd);
497
498 /*
499 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
500 * to FE.
501 */
502 if (transport_off == 2)
503 cmd->se_lun = NULL;
a1d8b49a 504 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 505
a1d8b49a 506 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 507 return 1;
508 }
509 if (transport_off) {
a1d8b49a 510 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 511 if (transport_off == 2) {
512 transport_all_task_dev_remove_state(cmd);
513 /*
514 * Clear struct se_cmd->se_lun before the transport_off == 2
515 * handoff to fabric module.
516 */
517 cmd->se_lun = NULL;
518 /*
519 * Some fabric modules like tcm_loop can release
25985edc 520 * their internally allocated I/O reference now and
c66ac9db 521 * struct se_cmd now.
88dd9e26
NB		 522 *
523 * Fabric modules are expected to return '1' here if the
524 * se_cmd being passed is released at this point,
525 * or zero if not being released.
c66ac9db 526 */
e3d6f909 527 if (cmd->se_tfo->check_stop_free != NULL) {
c66ac9db 528 spin_unlock_irqrestore(
a1d8b49a 529 &cmd->t_state_lock, flags);
c66ac9db 530
88dd9e26 531 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 532 }
533 }
a1d8b49a 534 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 535
536 return 0;
537 } else if (t_state)
538 cmd->t_state = t_state;
a1d8b49a 539 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 540
541 return 0;
542}
543
544static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
545{
546 return transport_cmd_check_stop(cmd, 2, 0);
547}
548
549static void transport_lun_remove_cmd(struct se_cmd *cmd)
550{
e3d6f909 551 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 552 unsigned long flags;
553
554 if (!lun)
555 return;
556
a1d8b49a 557 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 558 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 559 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 560 goto check_lun;
561 }
a1d8b49a 562 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 563 transport_all_task_dev_remove_state(cmd);
a1d8b49a 564 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 565
c66ac9db
NB		 566
567check_lun:
568 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
a1d8b49a 569 if (atomic_read(&cmd->transport_lun_active)) {
5951146d 570 list_del(&cmd->se_lun_node);
a1d8b49a 571 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db 572#if 0
6708bb27 573 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
e3d6f909 574 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
c66ac9db
NB		 575#endif
576 }
577 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
578}
579
580void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
581{
8dc52b54
NB		 582 if (!cmd->se_tmr_req)
583 transport_lun_remove_cmd(cmd);
c66ac9db
NB		 584
585 if (transport_cmd_check_stop_to_fabric(cmd))
586 return;
77039d1e 587 if (remove) {
3df8d40b 588 transport_remove_cmd_from_queue(cmd);
e6a2573f 589 transport_put_cmd(cmd);
77039d1e 590 }
c66ac9db
NB		 591}
592
f7a5cc0b
CH		 593static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
594 bool at_head)
c66ac9db
NB		 595{
596 struct se_device *dev = cmd->se_dev;
e3d6f909 597 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 598 unsigned long flags;
599
c66ac9db 600 if (t_state) {
a1d8b49a 601 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 602 cmd->t_state = t_state;
a1d8b49a
AG		 603 atomic_set(&cmd->t_transport_active, 1);
604 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 605 }
606
607 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
79a7fef2
RD		 608
609 /* If the cmd is already on the list, remove it before we add it */
610 if (!list_empty(&cmd->se_queue_node))
611 list_del(&cmd->se_queue_node);
612 else
613 atomic_inc(&qobj->queue_cnt);
614
f7a5cc0b 615 if (at_head)
07bde79a 616 list_add(&cmd->se_queue_node, &qobj->qobj_list);
f7a5cc0b 617 else
07bde79a 618 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
79a7fef2 619 atomic_set(&cmd->t_transport_queue_active, 1);
c66ac9db
NB		 620 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
621
c66ac9db 622 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 623}
624
5951146d
AG		 625static struct se_cmd *
626transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 627{
5951146d 628 struct se_cmd *cmd;
c66ac9db
NB		 629 unsigned long flags;
630
631 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
632 if (list_empty(&qobj->qobj_list)) {
633 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
634 return NULL;
635 }
5951146d 636 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 637
79a7fef2 638 atomic_set(&cmd->t_transport_queue_active, 0);
c66ac9db 639
79a7fef2 640 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 641 atomic_dec(&qobj->queue_cnt);
642 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
643
5951146d 644 return cmd;
c66ac9db
NB		 645}
646
3df8d40b 647static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
c66ac9db 648{
3df8d40b 649 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
c66ac9db
NB		 650 unsigned long flags;
651
652 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
6708bb27 653 if (!atomic_read(&cmd->t_transport_queue_active)) {
c66ac9db
NB		 654 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
655 return;
656 }
79a7fef2
RD		 657 atomic_set(&cmd->t_transport_queue_active, 0);
658 atomic_dec(&qobj->queue_cnt);
659 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 660 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
661
a1d8b49a 662 if (atomic_read(&cmd->t_transport_queue_active)) {
6708bb27 663 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
e3d6f909 664 cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 665 atomic_read(&cmd->t_transport_queue_active));
c66ac9db
NB		 666 }
667}
668
669/*
670 * Completion function used by TCM subsystem plugins (such as FILEIO)
671 * for queueing up response from struct se_subsystem_api->do_task()
672 */
673void transport_complete_sync_cache(struct se_cmd *cmd, int good)
674{
a1d8b49a 675 struct se_task *task = list_entry(cmd->t_task_list.next,
c66ac9db
NB		 676 struct se_task, t_list);
677
678 if (good) {
679 cmd->scsi_status = SAM_STAT_GOOD;
680 task->task_scsi_status = GOOD;
681 } else {
682 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
03e98c9e
NB		 683 task->task_se_cmd->scsi_sense_reason =
684 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
685
c66ac9db
NB		 686 }
687
688 transport_complete_task(task, good);
689}
690EXPORT_SYMBOL(transport_complete_sync_cache);
691
35e0e757
CH		 692static void target_complete_failure_work(struct work_struct *work)
693{
694 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
695
03e98c9e 696 transport_generic_request_failure(cmd);
35e0e757
CH		 697}
698
c66ac9db
NB		 699/* transport_complete_task():
700 *
701 * Called from interrupt and non interrupt context depending
702 * on the transport plugin.
703 */
704void transport_complete_task(struct se_task *task, int success)
705{
e3d6f909 706 struct se_cmd *cmd = task->task_se_cmd;
42bf829e 707 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 708 unsigned long flags;
709#if 0
6708bb27 710 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
a1d8b49a 711 cmd->t_task_cdb[0], dev);
c66ac9db 712#endif
e3d6f909 713 if (dev)
c66ac9db 714 atomic_inc(&dev->depth_left);
c66ac9db 715
a1d8b49a 716 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 717 task->task_flags &= ~TF_ACTIVE;
c66ac9db
NB		 718
719 /*
720 * See if any sense data exists, if so set the TASK_SENSE flag.
721 * Also check for any other post completion work that needs to be
722 * done by the plugins.
723 */
724 if (dev && dev->transport->transport_complete) {
725 if (dev->transport->transport_complete(task) != 0) {
726 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
727 task->task_sense = 1;
728 success = 1;
729 }
730 }
731
732 /*
733 * See if we are waiting for outstanding struct se_task
734 * to complete for an exception condition
735 */
6c76bf95 736 if (task->task_flags & TF_REQUEST_STOP) {
a1d8b49a 737 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 738 complete(&task->task_stop_comp);
739 return;
740 }
2235007c
CH		 741
742 if (!success)
743 cmd->t_tasks_failed = 1;
744
c66ac9db
NB		 745 /*
746 * Decrement the outstanding t_task_cdbs_left count. The last
747 * struct se_task from struct se_cmd will complete itself into the
748 * device queue depending upon int success.
749 */
6708bb27 750 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
a1d8b49a 751 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 752 return;
753 }
754
2235007c 755 if (cmd->t_tasks_failed) {
c66ac9db
NB		 756 if (!task->task_error_status) {
757 task->task_error_status =
03e98c9e
NB		 758 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
759 cmd->scsi_sense_reason =
760 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 761 }
03e98c9e 762
35e0e757 763 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 764 } else {
a1d8b49a 765 atomic_set(&cmd->t_transport_complete, 1);
35e0e757 766 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 767 }
35e0e757 768
35e0e757
CH		 769 cmd->t_state = TRANSPORT_COMPLETE;
770 atomic_set(&cmd->t_transport_active, 1);
a1d8b49a 771 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 772
35e0e757 773 queue_work(target_completion_wq, &cmd->work);
c66ac9db
NB		 774}
775EXPORT_SYMBOL(transport_complete_task);
776
777/*
778 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
779 * struct se_task list are ready to be added to the active execution list
780 * struct se_device
781
782 * Called with se_dev_t->execute_task_lock called.
783 */
784static inline int transport_add_task_check_sam_attr(
785 struct se_task *task,
786 struct se_task *task_prev,
787 struct se_device *dev)
788{
789 /*
790 * No SAM Task attribute emulation enabled, add to tail of
791 * execution queue
792 */
793 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
794 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
795 return 0;
796 }
797 /*
798 * HEAD_OF_QUEUE attribute for received CDB, which means
799 * the first task that is associated with a struct se_cmd goes to
800 * head of the struct se_device->execute_task_list, and task_prev
801 * after that for each subsequent task
802 */
e66ecd50 803 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 804 list_add(&task->t_execute_list,
805 (task_prev != NULL) ?
806 &task_prev->t_execute_list :
807 &dev->execute_task_list);
808
6708bb27 809 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
c66ac9db 810 " in execution queue\n",
6708bb27 811 task->task_se_cmd->t_task_cdb[0]);
c66ac9db
NB		 812 return 1;
813 }
814 /*
815 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
816 * transitioned from Dermant -> Active state, and are added to the end
817 * of the struct se_device->execute_task_list
818 */
819 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
820 return 0;
821}
822
823/* __transport_add_task_to_execute_queue():
824 *
825 * Called with se_dev_t->execute_task_lock called.
826 */
827static void __transport_add_task_to_execute_queue(
828 struct se_task *task,
829 struct se_task *task_prev,
830 struct se_device *dev)
831{
832 int head_of_queue;
833
834 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
835 atomic_inc(&dev->execute_tasks);
836
837 if (atomic_read(&task->task_state_active))
838 return;
839 /*
840 * Determine if this task needs to go to HEAD_OF_QUEUE for the
841 * state list as well. Running with SAM Task Attribute emulation
842 * will always return head_of_queue == 0 here
843 */
844 if (head_of_queue)
845 list_add(&task->t_state_list, (task_prev) ?
846 &task_prev->t_state_list :
847 &dev->state_task_list);
848 else
849 list_add_tail(&task->t_state_list, &dev->state_task_list);
850
851 atomic_set(&task->task_state_active, 1);
852
6708bb27 853 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
e3d6f909 854 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
c66ac9db
NB		 855 task, dev);
856}
857
858static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
859{
42bf829e 860 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 861 struct se_task *task;
862 unsigned long flags;
863
a1d8b49a
AG		 864 spin_lock_irqsave(&cmd->t_state_lock, flags);
865 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 866 if (atomic_read(&task->task_state_active))
867 continue;
868
869 spin_lock(&dev->execute_task_lock);
870 list_add_tail(&task->t_state_list, &dev->state_task_list);
871 atomic_set(&task->task_state_active, 1);
872
6708bb27
AG		 873 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
874 task->task_se_cmd->se_tfo->get_task_tag(
c66ac9db
NB		 875 task->task_se_cmd), task, dev);
876
877 spin_unlock(&dev->execute_task_lock);
878 }
a1d8b49a 879 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 880}
881
882static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
883{
5951146d 884 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 885 struct se_task *task, *task_prev = NULL;
886 unsigned long flags;
887
888 spin_lock_irqsave(&dev->execute_task_lock, flags);
a1d8b49a 889 list_for_each_entry(task, &cmd->t_task_list, t_list) {
04629b7b 890 if (!list_empty(&task->t_execute_list))
c66ac9db
NB		 891 continue;
892 /*
893 * __transport_add_task_to_execute_queue() handles the
894 * SAM Task Attribute emulation if enabled
895 */
896 __transport_add_task_to_execute_queue(task, task_prev, dev);
c66ac9db
NB		 897 task_prev = task;
898 }
899 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 900}
901
04629b7b
CH		 902void __transport_remove_task_from_execute_queue(struct se_task *task,
903 struct se_device *dev)
904{
905 list_del_init(&task->t_execute_list);
906 atomic_dec(&dev->execute_tasks);
907}
908
52208ae3 909void transport_remove_task_from_execute_queue(
c66ac9db
NB		 910 struct se_task *task,
911 struct se_device *dev)
912{
913 unsigned long flags;
914
04629b7b 915 if (WARN_ON(list_empty(&task->t_execute_list)))
af57c3ac 916 return;
af57c3ac 917
c66ac9db 918 spin_lock_irqsave(&dev->execute_task_lock, flags);
04629b7b 919 __transport_remove_task_from_execute_queue(task, dev);
c66ac9db
NB		 920 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
921}
922
07bde79a 923/*
f147abb4 924 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a
NB		 925 */
926
927static void target_qf_do_work(struct work_struct *work)
928{
929 struct se_device *dev = container_of(work, struct se_device,
930 qf_work_queue);
bcac364a 931 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 932 struct se_cmd *cmd, *cmd_tmp;
933
934 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 935 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
936 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 937
bcac364a 938 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 939 list_del(&cmd->se_qf_node);
940 atomic_dec(&dev->dev_qf_count);
941 smp_mb__after_atomic_dec();
07bde79a 942
6708bb27 943 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 944 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 945 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 946 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
947 : "UNKNOWN");
f7a5cc0b
CH		 948
949 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
07bde79a 950 }
07bde79a
NB		 951}
952
c66ac9db
NB		 953unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
954{
955 switch (cmd->data_direction) {
956 case DMA_NONE:
957 return "NONE";
958 case DMA_FROM_DEVICE:
959 return "READ";
960 case DMA_TO_DEVICE:
961 return "WRITE";
962 case DMA_BIDIRECTIONAL:
963 return "BIDI";
964 default:
965 break;
966 }
967
968 return "UNKNOWN";
969}
970
971void transport_dump_dev_state(
972 struct se_device *dev,
973 char *b,
974 int *bl)
975{
976 *bl += sprintf(b + *bl, "Status: ");
977 switch (dev->dev_status) {
978 case TRANSPORT_DEVICE_ACTIVATED:
979 *bl += sprintf(b + *bl, "ACTIVATED");
980 break;
981 case TRANSPORT_DEVICE_DEACTIVATED:
982 *bl += sprintf(b + *bl, "DEACTIVATED");
983 break;
984 case TRANSPORT_DEVICE_SHUTDOWN:
985 *bl += sprintf(b + *bl, "SHUTDOWN");
986 break;
987 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
988 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
989 *bl += sprintf(b + *bl, "OFFLINE");
990 break;
991 default:
992 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
993 break;
994 }
995
996 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
997 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
998 dev->queue_depth);
999 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
e3d6f909 1000 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db
NB		 1001 *bl += sprintf(b + *bl, " ");
1002}
1003
c66ac9db
NB		 1004void transport_dump_vpd_proto_id(
1005 struct t10_vpd *vpd,
1006 unsigned char *p_buf,
1007 int p_buf_len)
1008{
1009 unsigned char buf[VPD_TMP_BUF_SIZE];
1010 int len;
1011
1012 memset(buf, 0, VPD_TMP_BUF_SIZE);
1013 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1014
1015 switch (vpd->protocol_identifier) {
1016 case 0x00:
1017 sprintf(buf+len, "Fibre Channel\n");
1018 break;
1019 case 0x10:
1020 sprintf(buf+len, "Parallel SCSI\n");
1021 break;
1022 case 0x20:
1023 sprintf(buf+len, "SSA\n");
1024 break;
1025 case 0x30:
1026 sprintf(buf+len, "IEEE 1394\n");
1027 break;
1028 case 0x40:
1029 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1030 " Protocol\n");
1031 break;
1032 case 0x50:
1033 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1034 break;
1035 case 0x60:
1036 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1037 break;
1038 case 0x70:
1039 sprintf(buf+len, "Automation/Drive Interface Transport"
1040 " Protocol\n");
1041 break;
1042 case 0x80:
1043 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1044 break;
1045 default:
1046 sprintf(buf+len, "Unknown 0x%02x\n",
1047 vpd->protocol_identifier);
1048 break;
1049 }
1050
1051 if (p_buf)
1052 strncpy(p_buf, buf, p_buf_len);
1053 else
6708bb27 1054 pr_debug("%s", buf);
c66ac9db
NB		 1055}
1056
1057void
1058transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1059{
1060 /*
1061 * Check if the Protocol Identifier Valid (PIV) bit is set..
1062 *
1063 * from spc3r23.pdf section 7.5.1
1064 */
1065 if (page_83[1] & 0x80) {
1066 vpd->protocol_identifier = (page_83[0] & 0xf0);
1067 vpd->protocol_identifier_set = 1;
1068 transport_dump_vpd_proto_id(vpd, NULL, 0);
1069 }
1070}
1071EXPORT_SYMBOL(transport_set_vpd_proto_id);
1072
1073int transport_dump_vpd_assoc(
1074 struct t10_vpd *vpd,
1075 unsigned char *p_buf,
1076 int p_buf_len)
1077{
1078 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1079 int ret = 0;
1080 int len;
c66ac9db
NB		 1081
1082 memset(buf, 0, VPD_TMP_BUF_SIZE);
1083 len = sprintf(buf, "T10 VPD Identifier Association: ");
1084
1085 switch (vpd->association) {
1086 case 0x00:
1087 sprintf(buf+len, "addressed logical unit\n");
1088 break;
1089 case 0x10:
1090 sprintf(buf+len, "target port\n");
1091 break;
1092 case 0x20:
1093 sprintf(buf+len, "SCSI target device\n");
1094 break;
1095 default:
1096 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 1097 ret = -EINVAL;
c66ac9db
NB		 1098 break;
1099 }
1100
1101 if (p_buf)
1102 strncpy(p_buf, buf, p_buf_len);
1103 else
6708bb27 1104 pr_debug("%s", buf);
c66ac9db
NB		 1105
1106 return ret;
1107}
1108
1109int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1110{
1111 /*
1112 * The VPD identification association..
1113 *
1114 * from spc3r23.pdf Section 7.6.3.1 Table 297
1115 */
1116 vpd->association = (page_83[1] & 0x30);
1117 return transport_dump_vpd_assoc(vpd, NULL, 0);
1118}
1119EXPORT_SYMBOL(transport_set_vpd_assoc);
1120
1121int transport_dump_vpd_ident_type(
1122 struct t10_vpd *vpd,
1123 unsigned char *p_buf,
1124 int p_buf_len)
1125{
1126 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1127 int ret = 0;
1128 int len;
c66ac9db
NB		 1129
1130 memset(buf, 0, VPD_TMP_BUF_SIZE);
1131 len = sprintf(buf, "T10 VPD Identifier Type: ");
1132
1133 switch (vpd->device_identifier_type) {
1134 case 0x00:
1135 sprintf(buf+len, "Vendor specific\n");
1136 break;
1137 case 0x01:
1138 sprintf(buf+len, "T10 Vendor ID based\n");
1139 break;
1140 case 0x02:
1141 sprintf(buf+len, "EUI-64 based\n");
1142 break;
1143 case 0x03:
1144 sprintf(buf+len, "NAA\n");
1145 break;
1146 case 0x04:
1147 sprintf(buf+len, "Relative target port identifier\n");
1148 break;
1149 case 0x08:
1150 sprintf(buf+len, "SCSI name string\n");
1151 break;
1152 default:
1153 sprintf(buf+len, "Unsupported: 0x%02x\n",
1154 vpd->device_identifier_type);
e3d6f909 1155 ret = -EINVAL;
c66ac9db
NB		 1156 break;
1157 }
1158
e3d6f909
AG		 1159 if (p_buf) {
1160 if (p_buf_len < strlen(buf)+1)
1161 return -EINVAL;
c66ac9db 1162 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1163 } else {
6708bb27 1164 pr_debug("%s", buf);
e3d6f909 1165 }
c66ac9db
NB		 1166
1167 return ret;
1168}
1169
1170int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1171{
1172 /*
1173 * The VPD identifier type..
1174 *
1175 * from spc3r23.pdf Section 7.6.3.1 Table 298
1176 */
1177 vpd->device_identifier_type = (page_83[1] & 0x0f);
1178 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1179}
1180EXPORT_SYMBOL(transport_set_vpd_ident_type);
1181
1182int transport_dump_vpd_ident(
1183 struct t10_vpd *vpd,
1184 unsigned char *p_buf,
1185 int p_buf_len)
1186{
1187 unsigned char buf[VPD_TMP_BUF_SIZE];
1188 int ret = 0;
1189
1190 memset(buf, 0, VPD_TMP_BUF_SIZE);
1191
1192 switch (vpd->device_identifier_code_set) {
1193 case 0x01: /* Binary */
1194 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1195 &vpd->device_identifier[0]);
1196 break;
1197 case 0x02: /* ASCII */
1198 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1199 &vpd->device_identifier[0]);
1200 break;
1201 case 0x03: /* UTF-8 */
1202 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1203 &vpd->device_identifier[0]);
1204 break;
1205 default:
1206 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1207 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1208 ret = -EINVAL;
c66ac9db
NB		 1209 break;
1210 }
1211
1212 if (p_buf)
1213 strncpy(p_buf, buf, p_buf_len);
1214 else
6708bb27 1215 pr_debug("%s", buf);
c66ac9db
NB		 1216
1217 return ret;
1218}
1219
1220int
1221transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1222{
1223 static const char hex_str[] = "0123456789abcdef";
1224 int j = 0, i = 4; /* offset to start of the identifer */
1225
1226 /*
1227 * The VPD Code Set (encoding)
1228 *
1229 * from spc3r23.pdf Section 7.6.3.1 Table 296
1230 */
1231 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1232 switch (vpd->device_identifier_code_set) {
1233 case 0x01: /* Binary */
1234 vpd->device_identifier[j++] =
1235 hex_str[vpd->device_identifier_type];
1236 while (i < (4 + page_83[3])) {
1237 vpd->device_identifier[j++] =
1238 hex_str[(page_83[i] & 0xf0) >> 4];
1239 vpd->device_identifier[j++] =
1240 hex_str[page_83[i] & 0x0f];
1241 i++;
1242 }
1243 break;
1244 case 0x02: /* ASCII */
1245 case 0x03: /* UTF-8 */
1246 while (i < (4 + page_83[3]))
1247 vpd->device_identifier[j++] = page_83[i++];
1248 break;
1249 default:
1250 break;
1251 }
1252
1253 return transport_dump_vpd_ident(vpd, NULL, 0);
1254}
1255EXPORT_SYMBOL(transport_set_vpd_ident);
1256
1257static void core_setup_task_attr_emulation(struct se_device *dev)
1258{
1259 /*
1260 * If this device is from Target_Core_Mod/pSCSI, disable the
1261 * SAM Task Attribute emulation.
1262 *
1263 * This is currently not available in upsream Linux/SCSI Target
1264 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1265 */
e3d6f909 1266 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1267 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1268 return;
1269 }
1270
1271 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1272 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1273 " device\n", dev->transport->name,
1274 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1275}
1276
1277static void scsi_dump_inquiry(struct se_device *dev)
1278{
e3d6f909 1279 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
c66ac9db
NB		 1280 int i, device_type;
1281 /*
1282 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1283 */
6708bb27 1284 pr_debug(" Vendor: ");
c66ac9db
NB		 1285 for (i = 0; i < 8; i++)
1286 if (wwn->vendor[i] >= 0x20)
6708bb27 1287 pr_debug("%c", wwn->vendor[i]);
c66ac9db 1288 else
6708bb27 1289 pr_debug(" ");
c66ac9db 1290
6708bb27 1291 pr_debug(" Model: ");
c66ac9db
NB		 1292 for (i = 0; i < 16; i++)
1293 if (wwn->model[i] >= 0x20)
6708bb27 1294 pr_debug("%c", wwn->model[i]);
c66ac9db 1295 else
6708bb27 1296 pr_debug(" ");
c66ac9db 1297
6708bb27 1298 pr_debug(" Revision: ");
c66ac9db
NB		 1299 for (i = 0; i < 4; i++)
1300 if (wwn->revision[i] >= 0x20)
6708bb27 1301 pr_debug("%c", wwn->revision[i]);
c66ac9db 1302 else
6708bb27 1303 pr_debug(" ");
c66ac9db 1304
6708bb27 1305 pr_debug("\n");
c66ac9db 1306
e3d6f909 1307 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1308 pr_debug(" Type: %s ", scsi_device_type(device_type));
1309 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1310 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1311}
1312
1313struct se_device *transport_add_device_to_core_hba(
1314 struct se_hba *hba,
1315 struct se_subsystem_api *transport,
1316 struct se_subsystem_dev *se_dev,
1317 u32 device_flags,
1318 void *transport_dev,
1319 struct se_dev_limits *dev_limits,
1320 const char *inquiry_prod,
1321 const char *inquiry_rev)
1322{
12a18bdc 1323 int force_pt;
c66ac9db
NB		 1324 struct se_device *dev;
1325
1326 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1327 if (!dev) {
1328 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1329 return NULL;
1330 }
c66ac9db 1331
e3d6f909 1332 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1333 dev->dev_flags = device_flags;
1334 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1335 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1336 dev->se_hba = hba;
1337 dev->se_sub_dev = se_dev;
1338 dev->transport = transport;
1339 atomic_set(&dev->active_cmds, 0);
1340 INIT_LIST_HEAD(&dev->dev_list);
1341 INIT_LIST_HEAD(&dev->dev_sep_list);
1342 INIT_LIST_HEAD(&dev->dev_tmr_list);
1343 INIT_LIST_HEAD(&dev->execute_task_list);
1344 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1345 INIT_LIST_HEAD(&dev->ordered_cmd_list);
1346 INIT_LIST_HEAD(&dev->state_task_list);
07bde79a 1347 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1348 spin_lock_init(&dev->execute_task_lock);
1349 spin_lock_init(&dev->delayed_cmd_lock);
1350 spin_lock_init(&dev->ordered_cmd_lock);
1351 spin_lock_init(&dev->state_task_lock);
1352 spin_lock_init(&dev->dev_alua_lock);
1353 spin_lock_init(&dev->dev_reservation_lock);
1354 spin_lock_init(&dev->dev_status_lock);
1355 spin_lock_init(&dev->dev_status_thr_lock);
1356 spin_lock_init(&dev->se_port_lock);
1357 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1358 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1359
1360 dev->queue_depth = dev_limits->queue_depth;
1361 atomic_set(&dev->depth_left, dev->queue_depth);
1362 atomic_set(&dev->dev_ordered_id, 0);
1363
1364 se_dev_set_default_attribs(dev, dev_limits);
1365
1366 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1367 dev->creation_time = get_jiffies_64();
1368 spin_lock_init(&dev->stats_lock);
1369
1370 spin_lock(&hba->device_lock);
1371 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1372 hba->dev_count++;
1373 spin_unlock(&hba->device_lock);
1374 /*
1375 * Setup the SAM Task Attribute emulation for struct se_device
1376 */
1377 core_setup_task_attr_emulation(dev);
1378 /*
1379 * Force PR and ALUA passthrough emulation with internal object use.
1380 */
1381 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1382 /*
1383 * Setup the Reservations infrastructure for struct se_device
1384 */
1385 core_setup_reservations(dev, force_pt);
1386 /*
1387 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1388 */
1389 if (core_setup_alua(dev, force_pt) < 0)
1390 goto out;
1391
1392 /*
1393 * Startup the struct se_device processing thread
1394 */
1395 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1396 "LIO_%s", dev->transport->name);
c66ac9db 1397 if (IS_ERR(dev->process_thread)) {
6708bb27 1398 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1399 dev->transport->name);
c66ac9db
NB		 1400 goto out;
1401 }
07bde79a
NB		 1402 /*
1403 * Setup work_queue for QUEUE_FULL
1404 */
1405 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1406 /*
1407 * Preload the initial INQUIRY const values if we are doing
1408 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1409 * passthrough because this is being provided by the backend LLD.
1410 * This is required so that transport_get_inquiry() copies these
1411 * originals once back into DEV_T10_WWN(dev) for the virtual device
1412 * setup.
1413 */
e3d6f909 1414 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1415 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1416 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1417 " INQUIRY consts\n");
1418 goto out;
1419 }
1420
e3d6f909
AG		 1421 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1422 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1423 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1424 }
1425 scsi_dump_inquiry(dev);
1426
12a18bdc 1427 return dev;
c66ac9db 1428out:
c66ac9db
NB		 1429 kthread_stop(dev->process_thread);
1430
1431 spin_lock(&hba->device_lock);
1432 list_del(&dev->dev_list);
1433 hba->dev_count--;
1434 spin_unlock(&hba->device_lock);
1435
1436 se_release_vpd_for_dev(dev);
1437
c66ac9db
NB		 1438 kfree(dev);
1439
1440 return NULL;
1441}
1442EXPORT_SYMBOL(transport_add_device_to_core_hba);
1443
1444/* transport_generic_prepare_cdb():
1445 *
1446 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1447 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1448 * The point of this is since we are mapping iSCSI LUNs to
1449 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1450 * devices and HBAs for a loop.
1451 */
1452static inline void transport_generic_prepare_cdb(
1453 unsigned char *cdb)
1454{
1455 switch (cdb[0]) {
1456 case READ_10: /* SBC - RDProtect */
1457 case READ_12: /* SBC - RDProtect */
1458 case READ_16: /* SBC - RDProtect */
1459 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1460 case VERIFY: /* SBC - VRProtect */
1461 case VERIFY_16: /* SBC - VRProtect */
1462 case WRITE_VERIFY: /* SBC - VRProtect */
1463 case WRITE_VERIFY_12: /* SBC - VRProtect */
1464 break;
1465 default:
1466 cdb[1] &= 0x1f; /* clear logical unit number */
1467 break;
1468 }
1469}
1470
1471static struct se_task *
1472transport_generic_get_task(struct se_cmd *cmd,
1473 enum dma_data_direction data_direction)
1474{
1475 struct se_task *task;
5951146d 1476 struct se_device *dev = cmd->se_dev;
c66ac9db 1477
6708bb27 1478 task = dev->transport->alloc_task(cmd->t_task_cdb);
c66ac9db 1479 if (!task) {
6708bb27 1480 pr_err("Unable to allocate struct se_task\n");
c66ac9db
NB		 1481 return NULL;
1482 }
1483
1484 INIT_LIST_HEAD(&task->t_list);
1485 INIT_LIST_HEAD(&task->t_execute_list);
1486 INIT_LIST_HEAD(&task->t_state_list);
1487 init_completion(&task->task_stop_comp);
c66ac9db 1488 task->task_se_cmd = cmd;
c66ac9db
NB		 1489 task->task_data_direction = data_direction;
1490
c66ac9db
NB		 1491 return task;
1492}
1493
1494static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1495
c66ac9db
NB		 1496/*
1497 * Used by fabric modules containing a local struct se_cmd within their
1498 * fabric dependent per I/O descriptor.
1499 */
1500void transport_init_se_cmd(
1501 struct se_cmd *cmd,
1502 struct target_core_fabric_ops *tfo,
1503 struct se_session *se_sess,
1504 u32 data_length,
1505 int data_direction,
1506 int task_attr,
1507 unsigned char *sense_buffer)
1508{
5951146d
AG		 1509 INIT_LIST_HEAD(&cmd->se_lun_node);
1510 INIT_LIST_HEAD(&cmd->se_delayed_node);
1511 INIT_LIST_HEAD(&cmd->se_ordered_node);
07bde79a 1512 INIT_LIST_HEAD(&cmd->se_qf_node);
79a7fef2 1513 INIT_LIST_HEAD(&cmd->se_queue_node);
a17f091d 1514 INIT_LIST_HEAD(&cmd->se_cmd_list);
a1d8b49a
AG		 1515 INIT_LIST_HEAD(&cmd->t_task_list);
1516 init_completion(&cmd->transport_lun_fe_stop_comp);
1517 init_completion(&cmd->transport_lun_stop_comp);
1518 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1519 init_completion(&cmd->cmd_wait_comp);
a1d8b49a
AG		 1520 spin_lock_init(&cmd->t_state_lock);
1521 atomic_set(&cmd->transport_dev_active, 1);
c66ac9db
NB		 1522
1523 cmd->se_tfo = tfo;
1524 cmd->se_sess = se_sess;
1525 cmd->data_length = data_length;
1526 cmd->data_direction = data_direction;
1527 cmd->sam_task_attr = task_attr;
1528 cmd->sense_buffer = sense_buffer;
1529}
1530EXPORT_SYMBOL(transport_init_se_cmd);
1531
1532static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1533{
1534 /*
1535 * Check if SAM Task Attribute emulation is enabled for this
1536 * struct se_device storage object
1537 */
5951146d 1538 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1539 return 0;
1540
e66ecd50 1541 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1542 pr_debug("SAM Task Attribute ACA"
c66ac9db 1543 " emulation is not supported\n");
e3d6f909 1544 return -EINVAL;
c66ac9db
NB		 1545 }
1546 /*
1547 * Used to determine when ORDERED commands should go from
1548 * Dormant to Active status.
1549 */
5951146d 1550 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1551 smp_mb__after_atomic_inc();
6708bb27 1552 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1553 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1554 cmd->se_dev->transport->name);
c66ac9db
NB		 1555 return 0;
1556}
1557
c66ac9db
NB		 1558/* transport_generic_allocate_tasks():
1559 *
1560 * Called from fabric RX Thread.
1561 */
1562int transport_generic_allocate_tasks(
1563 struct se_cmd *cmd,
1564 unsigned char *cdb)
1565{
1566 int ret;
1567
1568 transport_generic_prepare_cdb(cdb);
c66ac9db
NB		 1569 /*
1570 * Ensure that the received CDB is less than the max (252 + 8) bytes
1571 * for VARIABLE_LENGTH_CMD
1572 */
1573 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1574 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1575 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1576 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
03e98c9e
NB		 1577 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1578 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
e3d6f909 1579 return -EINVAL;
c66ac9db
NB		 1580 }
1581 /*
1582 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1583 * allocate the additional extended CDB buffer now.. Otherwise
1584 * setup the pointer from __t_task_cdb to t_task_cdb.
1585 */
a1d8b49a
AG		 1586 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1587 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1588 GFP_KERNEL);
6708bb27
AG		 1589 if (!cmd->t_task_cdb) {
1590 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1591 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1592 scsi_command_size(cdb),
a1d8b49a 1593 (unsigned long)sizeof(cmd->__t_task_cdb));
03e98c9e
NB		 1594 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1595 cmd->scsi_sense_reason =
1596 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
e3d6f909 1597 return -ENOMEM;
c66ac9db
NB		 1598 }
1599 } else
a1d8b49a 1600 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1601 /*
a1d8b49a 1602 * Copy the original CDB into cmd->
c66ac9db 1603 */
a1d8b49a 1604 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1605 /*
1606 * Setup the received CDB based on SCSI defined opcodes and
1607 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1608 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1609 * pointer is expected to be setup before we reach this point.
1610 */
1611 ret = transport_generic_cmd_sequencer(cmd, cdb);
1612 if (ret < 0)
1613 return ret;
1614 /*
1615 * Check for SAM Task Attribute Emulation
1616 */
1617 if (transport_check_alloc_task_attr(cmd) < 0) {
1618 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1619 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1620 return -EINVAL;
c66ac9db
NB		 1621 }
1622 spin_lock(&cmd->se_lun->lun_sep_lock);
1623 if (cmd->se_lun->lun_sep)
1624 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1625 spin_unlock(&cmd->se_lun->lun_sep_lock);
1626 return 0;
1627}
1628EXPORT_SYMBOL(transport_generic_allocate_tasks);
1629
695434e1
NB		 1630/*
1631 * Used by fabric module frontends to queue tasks directly.
1632 * Many only be used from process context only
1633 */
1634int transport_handle_cdb_direct(
1635 struct se_cmd *cmd)
1636{
dd8ae59d
NB		 1637 int ret;
1638
695434e1
NB		 1639 if (!cmd->se_lun) {
1640 dump_stack();
6708bb27 1641 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1642 return -EINVAL;
1643 }
1644 if (in_interrupt()) {
1645 dump_stack();
6708bb27 1646 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1647 " from interrupt context\n");
1648 return -EINVAL;
1649 }
dd8ae59d
NB		 1650 /*
1651 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1652 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1653 * in existing usage to ensure that outstanding descriptors are handled
d14921d6 1654 * correctly during shutdown via transport_wait_for_tasks()
dd8ae59d
NB		 1655 *
1656 * Also, we don't take cmd->t_state_lock here as we only expect
1657 * this to be called for initial descriptor submission.
1658 */
1659 cmd->t_state = TRANSPORT_NEW_CMD;
1660 atomic_set(&cmd->t_transport_active, 1);
1661 /*
1662 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1663 * so follow TRANSPORT_NEW_CMD processing thread context usage
1664 * and call transport_generic_request_failure() if necessary..
1665 */
1666 ret = transport_generic_new_cmd(cmd);
03e98c9e
NB		 1667 if (ret < 0)
1668 transport_generic_request_failure(cmd);
1669
dd8ae59d 1670 return 0;
695434e1
NB		 1671}
1672EXPORT_SYMBOL(transport_handle_cdb_direct);
1673
c66ac9db
NB		 1674/*
1675 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1676 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1677 * complete setup in TCM process context w/ TFO->new_cmd_map().
1678 */
1679int transport_generic_handle_cdb_map(
1680 struct se_cmd *cmd)
1681{
e3d6f909 1682 if (!cmd->se_lun) {
c66ac9db 1683 dump_stack();
6708bb27 1684 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1685 return -EINVAL;
c66ac9db
NB		 1686 }
1687
f7a5cc0b 1688 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
c66ac9db
NB		 1689 return 0;
1690}
1691EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1692
1693/* transport_generic_handle_data():
1694 *
1695 *
1696 */
1697int transport_generic_handle_data(
1698 struct se_cmd *cmd)
1699{
1700 /*
1701 * For the software fabric case, then we assume the nexus is being
1702 * failed/shutdown when signals are pending from the kthread context
1703 * caller, so we return a failure. For the HW target mode case running
1704 * in interrupt code, the signal_pending() check is skipped.
1705 */
1706 if (!in_interrupt() && signal_pending(current))
e3d6f909 1707 return -EPERM;
c66ac9db
NB		 1708 /*
1709 * If the received CDB has aleady been ABORTED by the generic
1710 * target engine, we now call transport_check_aborted_status()
1711 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1712 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1713 * sequences at this point.
1714 */
1715 if (transport_check_aborted_status(cmd, 1) != 0)
1716 return 0;
1717
f7a5cc0b 1718 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
c66ac9db
NB		 1719 return 0;
1720}
1721EXPORT_SYMBOL(transport_generic_handle_data);
1722
1723/* transport_generic_handle_tmr():
1724 *
1725 *
1726 */
1727int transport_generic_handle_tmr(
1728 struct se_cmd *cmd)
1729{
f7a5cc0b 1730 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
c66ac9db
NB		 1731 return 0;
1732}
1733EXPORT_SYMBOL(transport_generic_handle_tmr);
1734
cdbb70bb
CH		 1735/*
1736 * If the task is active, request it to be stopped and sleep until it
1737 * has completed.
1738 */
1739bool target_stop_task(struct se_task *task, unsigned long *flags)
1740{
1741 struct se_cmd *cmd = task->task_se_cmd;
1742 bool was_active = false;
1743
1744 if (task->task_flags & TF_ACTIVE) {
1745 task->task_flags |= TF_REQUEST_STOP;
1746 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1747
1748 pr_debug("Task %p waiting to complete\n", task);
1749 wait_for_completion(&task->task_stop_comp);
1750 pr_debug("Task %p stopped successfully\n", task);
1751
1752 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1753 atomic_dec(&cmd->t_task_cdbs_left);
1754 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1755 was_active = true;
1756 }
1757
cdbb70bb
CH		 1758 return was_active;
1759}
1760
c66ac9db
NB		 1761static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1762{
1763 struct se_task *task, *task_tmp;
1764 unsigned long flags;
1765 int ret = 0;
1766
6708bb27 1767 pr_debug("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 1768 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 1769
1770 /*
1771 * No tasks remain in the execution queue
1772 */
a1d8b49a 1773 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1774 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 1775 &cmd->t_task_list, t_list) {
04629b7b 1776 pr_debug("Processing task %p\n", task);
c66ac9db
NB		 1777 /*
1778 * If the struct se_task has not been sent and is not active,
1779 * remove the struct se_task from the execution queue.
1780 */
6c76bf95 1781 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
a1d8b49a 1782 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1783 flags);
1784 transport_remove_task_from_execute_queue(task,
42bf829e 1785 cmd->se_dev);
c66ac9db 1786
04629b7b 1787 pr_debug("Task %p removed from execute queue\n", task);
a1d8b49a 1788 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 1789 continue;
1790 }
1791
cdbb70bb 1792 if (!target_stop_task(task, &flags)) {
04629b7b 1793 pr_debug("Task %p - did nothing\n", task);
c66ac9db
NB		 1794 ret++;
1795 }
c66ac9db 1796 }
a1d8b49a 1797 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1798
1799 return ret;
1800}
1801
c66ac9db
NB		 1802/*
1803 * Handle SAM-esque emulation for generic transport request failures.
1804 */
03e98c9e 1805static void transport_generic_request_failure(struct se_cmd *cmd)
c66ac9db 1806{
07bde79a
NB		 1807 int ret = 0;
1808
6708bb27 1809 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1810 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1811 cmd->t_task_cdb[0]);
03e98c9e 1812 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
e3d6f909 1813 cmd->se_tfo->get_cmd_state(cmd),
03e98c9e 1814 cmd->t_state, cmd->scsi_sense_reason);
6708bb27 1815 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
c66ac9db
NB		 1816 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1817 " t_transport_active: %d t_transport_stop: %d"
6708bb27 1818 " t_transport_sent: %d\n", cmd->t_task_list_num,
a1d8b49a
AG		 1819 atomic_read(&cmd->t_task_cdbs_left),
1820 atomic_read(&cmd->t_task_cdbs_sent),
1821 atomic_read(&cmd->t_task_cdbs_ex_left),
1822 atomic_read(&cmd->t_transport_active),
1823 atomic_read(&cmd->t_transport_stop),
1824 atomic_read(&cmd->t_transport_sent));
c66ac9db 1825
c66ac9db
NB		 1826 /*
1827 * For SAM Task Attribute emulation for failed struct se_cmd
1828 */
1829 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1830 transport_complete_task_attr(cmd);
1831
03e98c9e
NB		 1832 switch (cmd->scsi_sense_reason) {
1833 case TCM_NON_EXISTENT_LUN:
1834 case TCM_UNSUPPORTED_SCSI_OPCODE:
1835 case TCM_INVALID_CDB_FIELD:
1836 case TCM_INVALID_PARAMETER_LIST:
1837 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1838 case TCM_UNKNOWN_MODE_PAGE:
1839 case TCM_WRITE_PROTECTED:
1840 case TCM_CHECK_CONDITION_ABORT_CMD:
1841 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1842 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1843 break;
03e98c9e 1844 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1845 /*
1846 * No SENSE Data payload for this case, set SCSI Status
1847 * and queue the response to $FABRIC_MOD.
1848 *
1849 * Uses linux/include/scsi/scsi.h SAM status codes defs
1850 */
1851 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1852 /*
1853 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1854 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1855 * CONFLICT STATUS.
1856 *
1857 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1858 */
e3d6f909
AG		 1859 if (cmd->se_sess &&
1860 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1861 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1862 cmd->orig_fe_lun, 0x2C,
1863 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1864
07bde79a 1865 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1866 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1867 goto queue_full;
c66ac9db 1868 goto check_stop;
c66ac9db 1869 default:
6708bb27 1870 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
03e98c9e 1871 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
c66ac9db
NB		 1872 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1873 break;
1874 }
16ab8e60
NB		 1875 /*
1876 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1877 * make the call to transport_send_check_condition_and_sense()
1878 * directly. Otherwise expect the fabric to make the call to
1879 * transport_send_check_condition_and_sense() after handling
1880 * possible unsoliticied write data payloads.
1881 */
03e98c9e
NB		 1882 ret = transport_send_check_condition_and_sense(cmd,
1883 cmd->scsi_sense_reason, 0);
1884 if (ret == -EAGAIN || ret == -ENOMEM)
1885 goto queue_full;
07bde79a 1886
c66ac9db
NB		 1887check_stop:
1888 transport_lun_remove_cmd(cmd);
6708bb27 1889 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1890 ;
07bde79a
NB		 1891 return;
1892
1893queue_full:
e057f533
CH		 1894 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1895 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1896}
1897
c66ac9db
NB		 1898static inline u32 transport_lba_21(unsigned char *cdb)
1899{
1900 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1901}
1902
1903static inline u32 transport_lba_32(unsigned char *cdb)
1904{
1905 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1906}
1907
1908static inline unsigned long long transport_lba_64(unsigned char *cdb)
1909{
1910 unsigned int __v1, __v2;
1911
1912 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1913 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1914
1915 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1916}
1917
1918/*
1919 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1920 */
1921static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1922{
1923 unsigned int __v1, __v2;
1924
1925 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1926 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1927
1928 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1929}
1930
1931static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1932{
1933 unsigned long flags;
1934
a1d8b49a 1935 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 1936 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 1937 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 1938}
1939
c66ac9db
NB		 1940static inline int transport_tcq_window_closed(struct se_device *dev)
1941{
1942 if (dev->dev_tcq_window_closed++ <
1943 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
1944 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
1945 } else
1946 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
1947
e3d6f909 1948 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 1949 return 0;
1950}
1951
1952/*
1953 * Called from Fabric Module context from transport_execute_tasks()
1954 *
1955 * The return of this function determins if the tasks from struct se_cmd
1956 * get added to the execution queue in transport_execute_tasks(),
1957 * or are added to the delayed or ordered lists here.
1958 */
1959static inline int transport_execute_task_attr(struct se_cmd *cmd)
1960{
5951146d 1961 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1962 return 1;
1963 /*
25985edc 1964 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1965 * to allow the passed struct se_cmd list of tasks to the front of the list.
1966 */
e66ecd50 1967 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
5951146d 1968 atomic_inc(&cmd->se_dev->dev_hoq_count);
c66ac9db 1969 smp_mb__after_atomic_inc();
6708bb27 1970 pr_debug("Added HEAD_OF_QUEUE for CDB:"
c66ac9db 1971 " 0x%02x, se_ordered_id: %u\n",
6708bb27 1972 cmd->t_task_cdb[0],
c66ac9db
NB		 1973 cmd->se_ordered_id);
1974 return 1;
e66ecd50 1975 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d
AG		 1976 spin_lock(&cmd->se_dev->ordered_cmd_lock);
1977 list_add_tail(&cmd->se_ordered_node,
1978 &cmd->se_dev->ordered_cmd_list);
1979 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
c66ac9db 1980
5951146d 1981 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 1982 smp_mb__after_atomic_inc();
1983
6708bb27 1984 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 1985 " list, se_ordered_id: %u\n",
a1d8b49a 1986 cmd->t_task_cdb[0],
c66ac9db
NB		 1987 cmd->se_ordered_id);
1988 /*
1989 * Add ORDERED command to tail of execution queue if
1990 * no other older commands exist that need to be
1991 * completed first.
1992 */
6708bb27 1993 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 1994 return 1;
1995 } else {
1996 /*
1997 * For SIMPLE and UNTAGGED Task Attribute commands
1998 */
5951146d 1999 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 2000 smp_mb__after_atomic_inc();
2001 }
2002 /*
2003 * Otherwise if one or more outstanding ORDERED task attribute exist,
2004 * add the dormant task(s) built for the passed struct se_cmd to the
2005 * execution queue and become in Active state for this struct se_device.
2006 */
5951146d 2007 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 2008 /*
2009 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 2010 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 2011 */
5951146d 2012 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2013 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 2014 list_add_tail(&cmd->se_delayed_node,
2015 &cmd->se_dev->delayed_cmd_list);
2016 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2017
6708bb27 2018 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 2019 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 2020 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 2021 cmd->se_ordered_id);
2022 /*
2023 * Return zero to let transport_execute_tasks() know
2024 * not to add the delayed tasks to the execution list.
2025 */
2026 return 0;
2027 }
2028 /*
2029 * Otherwise, no ORDERED task attributes exist..
2030 */
2031 return 1;
2032}
2033
2034/*
2035 * Called from fabric module context in transport_generic_new_cmd() and
2036 * transport_generic_process_write()
2037 */
2038static int transport_execute_tasks(struct se_cmd *cmd)
2039{
2040 int add_tasks;
2041
db1620a2 2042 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
03e98c9e
NB		 2043 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2044 transport_generic_request_failure(cmd);
db1620a2 2045 return 0;
c66ac9db 2046 }
db1620a2 2047
c66ac9db
NB		 2048 /*
2049 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2050 * has occurred that prevents execution.
c66ac9db 2051 */
6708bb27 2052 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 2053 /*
2054 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2055 * attribute for the tasks of the received struct se_cmd CDB
2056 */
2057 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2058 if (!add_tasks)
c66ac9db
NB		 2059 goto execute_tasks;
2060 /*
2061 * This calls transport_add_tasks_from_cmd() to handle
2062 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2063 * (if enabled) in __transport_add_task_to_execute_queue() and
2064 * transport_add_task_check_sam_attr().
2065 */
2066 transport_add_tasks_from_cmd(cmd);
2067 }
2068 /*
2069 * Kick the execution queue for the cmd associated struct se_device
2070 * storage object.
2071 */
2072execute_tasks:
5951146d 2073 __transport_execute_tasks(cmd->se_dev);
c66ac9db
NB		 2074 return 0;
2075}
2076
2077/*
2078 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2079 * from struct se_device->execute_task_list and
2080 *
2081 * Called from transport_processing_thread()
2082 */
2083static int __transport_execute_tasks(struct se_device *dev)
2084{
2085 int error;
2086 struct se_cmd *cmd = NULL;
e3d6f909 2087 struct se_task *task = NULL;
c66ac9db
NB		 2088 unsigned long flags;
2089
2090 /*
2091 * Check if there is enough room in the device and HBA queue to send
a1d8b49a 2092 * struct se_tasks to the selected transport.
c66ac9db
NB		 2093 */
2094check_depth:
e3d6f909 2095 if (!atomic_read(&dev->depth_left))
c66ac9db 2096 return transport_tcq_window_closed(dev);
c66ac9db 2097
e3d6f909 2098 dev->dev_tcq_window_closed = 0;
c66ac9db 2099
e3d6f909
AG		 2100 spin_lock_irq(&dev->execute_task_lock);
2101 if (list_empty(&dev->execute_task_list)) {
2102 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2103 return 0;
2104 }
e3d6f909
AG		 2105 task = list_first_entry(&dev->execute_task_list,
2106 struct se_task, t_execute_list);
04629b7b 2107 __transport_remove_task_from_execute_queue(task, dev);
e3d6f909 2108 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2109
2110 atomic_dec(&dev->depth_left);
c66ac9db 2111
e3d6f909 2112 cmd = task->task_se_cmd;
c66ac9db 2113
a1d8b49a 2114 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 2115 task->task_flags |= (TF_ACTIVE | TF_SENT);
a1d8b49a 2116 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2117
a1d8b49a
AG		 2118 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2119 cmd->t_task_list_num)
415a090a 2120 atomic_set(&cmd->t_transport_sent, 1);
c66ac9db 2121
a1d8b49a 2122 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2123
5bda90c8
CH		 2124 if (cmd->execute_task)
2125 error = cmd->execute_task(task);
2126 else
2127 error = dev->transport->do_task(task);
d29a5b6a 2128 if (error != 0) {
d29a5b6a
CH		 2129 spin_lock_irqsave(&cmd->t_state_lock, flags);
2130 task->task_flags &= ~TF_ACTIVE;
2131 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2132 atomic_set(&cmd->t_transport_sent, 0);
2133 transport_stop_tasks_for_cmd(cmd);
2134 atomic_inc(&dev->depth_left);
03e98c9e 2135 transport_generic_request_failure(cmd);
c66ac9db
NB		 2136 }
2137
2138 goto check_depth;
2139
2140 return 0;
2141}
2142
c66ac9db
NB		 2143static inline u32 transport_get_sectors_6(
2144 unsigned char *cdb,
2145 struct se_cmd *cmd,
2146 int *ret)
2147{
5951146d 2148 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2149
2150 /*
2151 * Assume TYPE_DISK for non struct se_device objects.
2152 * Use 8-bit sector value.
2153 */
2154 if (!dev)
2155 goto type_disk;
2156
2157 /*
2158 * Use 24-bit allocation length for TYPE_TAPE.
2159 */
e3d6f909 2160 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2161 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2162
2163 /*
2164 * Everything else assume TYPE_DISK Sector CDB location.
2165 * Use 8-bit sector value.
2166 */
2167type_disk:
2168 return (u32)cdb[4];
2169}
2170
2171static inline u32 transport_get_sectors_10(
2172 unsigned char *cdb,
2173 struct se_cmd *cmd,
2174 int *ret)
2175{
5951146d 2176 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2177
2178 /*
2179 * Assume TYPE_DISK for non struct se_device objects.
2180 * Use 16-bit sector value.
2181 */
2182 if (!dev)
2183 goto type_disk;
2184
2185 /*
2186 * XXX_10 is not defined in SSC, throw an exception
2187 */
e3d6f909
AG		 2188 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2189 *ret = -EINVAL;
c66ac9db
NB		 2190 return 0;
2191 }
2192
2193 /*
2194 * Everything else assume TYPE_DISK Sector CDB location.
2195 * Use 16-bit sector value.
2196 */
2197type_disk:
2198 return (u32)(cdb[7] << 8) + cdb[8];
2199}
2200
2201static inline u32 transport_get_sectors_12(
2202 unsigned char *cdb,
2203 struct se_cmd *cmd,
2204 int *ret)
2205{
5951146d 2206 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2207
2208 /*
2209 * Assume TYPE_DISK for non struct se_device objects.
2210 * Use 32-bit sector value.
2211 */
2212 if (!dev)
2213 goto type_disk;
2214
2215 /*
2216 * XXX_12 is not defined in SSC, throw an exception
2217 */
e3d6f909
AG		 2218 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2219 *ret = -EINVAL;
c66ac9db
NB		 2220 return 0;
2221 }
2222
2223 /*
2224 * Everything else assume TYPE_DISK Sector CDB location.
2225 * Use 32-bit sector value.
2226 */
2227type_disk:
2228 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2229}
2230
2231static inline u32 transport_get_sectors_16(
2232 unsigned char *cdb,
2233 struct se_cmd *cmd,
2234 int *ret)
2235{
5951146d 2236 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2237
2238 /*
2239 * Assume TYPE_DISK for non struct se_device objects.
2240 * Use 32-bit sector value.
2241 */
2242 if (!dev)
2243 goto type_disk;
2244
2245 /*
2246 * Use 24-bit allocation length for TYPE_TAPE.
2247 */
e3d6f909 2248 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2249 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2250
2251type_disk:
2252 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2253 (cdb[12] << 8) + cdb[13];
2254}
2255
2256/*
2257 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2258 */
2259static inline u32 transport_get_sectors_32(
2260 unsigned char *cdb,
2261 struct se_cmd *cmd,
2262 int *ret)
2263{
2264 /*
2265 * Assume TYPE_DISK for non struct se_device objects.
2266 * Use 32-bit sector value.
2267 */
2268 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2269 (cdb[30] << 8) + cdb[31];
2270
2271}
2272
2273static inline u32 transport_get_size(
2274 u32 sectors,
2275 unsigned char *cdb,
2276 struct se_cmd *cmd)
2277{
5951146d 2278 struct se_device *dev = cmd->se_dev;
c66ac9db 2279
e3d6f909 2280 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2281 if (cdb[1] & 1) { /* sectors */
e3d6f909 2282 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2283 } else /* bytes */
2284 return sectors;
2285 }
2286#if 0
6708bb27 2287 pr_debug("Returning block_size: %u, sectors: %u == %u for"
e3d6f909
AG		 2288 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2289 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2290 dev->transport->name);
c66ac9db 2291#endif
e3d6f909 2292 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2293}
2294
c66ac9db
NB		 2295static void transport_xor_callback(struct se_cmd *cmd)
2296{
2297 unsigned char *buf, *addr;
ec98f782 2298 struct scatterlist *sg;
c66ac9db
NB		 2299 unsigned int offset;
2300 int i;
ec98f782 2301 int count;
c66ac9db
NB		 2302 /*
2303 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2304 *
2305 * 1) read the specified logical block(s);
2306 * 2) transfer logical blocks from the data-out buffer;
2307 * 3) XOR the logical blocks transferred from the data-out buffer with
2308 * the logical blocks read, storing the resulting XOR data in a buffer;
2309 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2310 * blocks transferred from the data-out buffer; and
2311 * 5) transfer the resulting XOR data to the data-in buffer.
2312 */
2313 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2314 if (!buf) {
2315 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2316 return;
2317 }
2318 /*
ec98f782 2319 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2320 * into the locally allocated *buf
2321 */
ec98f782
AG		 2322 sg_copy_to_buffer(cmd->t_data_sg,
2323 cmd->t_data_nents,
2324 buf,
2325 cmd->data_length);
2326
c66ac9db
NB		 2327 /*
2328 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2329 * cmd->t_mem_bidi_list
c66ac9db
NB		 2330 */
2331
2332 offset = 0;
ec98f782
AG		 2333 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2334 addr = kmap_atomic(sg_page(sg), KM_USER0);
2335 if (!addr)
c66ac9db
NB		 2336 goto out;
2337
ec98f782
AG		 2338 for (i = 0; i < sg->length; i++)
2339 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2340
ec98f782 2341 offset += sg->length;
c66ac9db
NB		 2342 kunmap_atomic(addr, KM_USER0);
2343 }
ec98f782 2344
c66ac9db
NB		 2345out:
2346 kfree(buf);
2347}
2348
2349/*
2350 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2351 */
2352static int transport_get_sense_data(struct se_cmd *cmd)
2353{
2354 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
42bf829e 2355 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2356 struct se_task *task = NULL, *task_tmp;
2357 unsigned long flags;
2358 u32 offset = 0;
2359
e3d6f909
AG		 2360 WARN_ON(!cmd->se_lun);
2361
42bf829e
CH		 2362 if (!dev)
2363 return 0;
2364
a1d8b49a 2365 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2366 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2367 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2368 return 0;
2369 }
2370
2371 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2372 &cmd->t_task_list, t_list) {
c66ac9db
NB		 2373 if (!task->task_sense)
2374 continue;
2375
e3d6f909 2376 if (!dev->transport->get_sense_buffer) {
6708bb27 2377 pr_err("dev->transport->get_sense_buffer"
c66ac9db
NB		 2378 " is NULL\n");
2379 continue;
2380 }
2381
e3d6f909 2382 sense_buffer = dev->transport->get_sense_buffer(task);
6708bb27 2383 if (!sense_buffer) {
04629b7b 2384 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
c66ac9db 2385 " sense buffer for task with sense\n",
04629b7b 2386 cmd->se_tfo->get_task_tag(cmd), task);
c66ac9db
NB		 2387 continue;
2388 }
a1d8b49a 2389 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2390
e3d6f909 2391 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2392 TRANSPORT_SENSE_BUFFER);
2393
5951146d 2394 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2395 TRANSPORT_SENSE_BUFFER);
2396 cmd->scsi_status = task->task_scsi_status;
2397 /* Automatically padded */
2398 cmd->scsi_sense_length =
2399 (TRANSPORT_SENSE_BUFFER + offset);
2400
6708bb27 2401 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
c66ac9db 2402 " and sense\n",
e3d6f909 2403 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2404 cmd->scsi_status);
2405 return 0;
2406 }
a1d8b49a 2407 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2408
2409 return -1;
2410}
2411
ec98f782
AG		 2412static inline long long transport_dev_end_lba(struct se_device *dev)
2413{
2414 return dev->transport->get_blocks(dev) + 1;
2415}
2416
2417static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2418{
2419 struct se_device *dev = cmd->se_dev;
2420 u32 sectors;
2421
2422 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2423 return 0;
2424
2425 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2426
6708bb27
AG		 2427 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2428 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2429 " transport_dev_end_lba(): %llu\n",
2430 cmd->t_task_lba, sectors,
2431 transport_dev_end_lba(dev));
7abbe7f3 2432 return -EINVAL;
ec98f782
AG		 2433 }
2434
7abbe7f3 2435 return 0;
ec98f782
AG		 2436}
2437
706d5860
NB		 2438static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2439{
2440 /*
2441 * Determine if the received WRITE_SAME is used to for direct
2442 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2443 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2444 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2445 */
2446 int passthrough = (dev->transport->transport_type ==
2447 TRANSPORT_PLUGIN_PHBA_PDEV);
2448
2449 if (!passthrough) {
2450 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2451 pr_err("WRITE_SAME PBDATA and LBDATA"
2452 " bits not supported for Block Discard"
2453 " Emulation\n");
2454 return -ENOSYS;
2455 }
2456 /*
2457 * Currently for the emulated case we only accept
2458 * tpws with the UNMAP=1 bit set.
2459 */
2460 if (!(flags[0] & 0x08)) {
2461 pr_err("WRITE_SAME w/o UNMAP bit not"
2462 " supported for Block Discard Emulation\n");
2463 return -ENOSYS;
2464 }
2465 }
2466
2467 return 0;
2468}
2469
c66ac9db
NB		 2470/* transport_generic_cmd_sequencer():
2471 *
2472 * Generic Command Sequencer that should work for most DAS transport
2473 * drivers.
2474 *
2475 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2476 * RX Thread.
2477 *
2478 * FIXME: Need to support other SCSI OPCODES where as well.
2479 */
2480static int transport_generic_cmd_sequencer(
2481 struct se_cmd *cmd,
2482 unsigned char *cdb)
2483{
5951146d 2484 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2485 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2486 int ret = 0, sector_ret = 0, passthrough;
2487 u32 sectors = 0, size = 0, pr_reg_type = 0;
2488 u16 service_action;
2489 u8 alua_ascq = 0;
2490 /*
2491 * Check for an existing UNIT ATTENTION condition
2492 */
2493 if (core_scsi3_ua_check(cmd, cdb) < 0) {
c66ac9db
NB		 2494 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2495 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2496 return -EINVAL;
c66ac9db
NB		 2497 }
2498 /*
2499 * Check status of Asymmetric Logical Unit Assignment port
2500 */
e3d6f909 2501 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db 2502 if (ret != 0) {
c66ac9db 2503 /*
25985edc 2504 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2505 * The ALUA additional sense code qualifier (ASCQ) is determined
2506 * by the ALUA primary or secondary access state..
2507 */
2508 if (ret > 0) {
2509#if 0
6708bb27 2510 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2511 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2512 cmd->se_tfo->get_fabric_name(), alua_ascq);
c66ac9db
NB		 2513#endif
2514 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2515 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2516 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2517 return -EINVAL;
c66ac9db
NB		 2518 }
2519 goto out_invalid_cdb_field;
2520 }
2521 /*
2522 * Check status for SPC-3 Persistent Reservations
2523 */
e3d6f909
AG		 2524 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2525 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
03e98c9e
NB		 2526 cmd, cdb, pr_reg_type) != 0) {
2527 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2528 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2529 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2530 return -EBUSY;
2531 }
c66ac9db
NB		 2532 /*
2533 * This means the CDB is allowed for the SCSI Initiator port
2534 * when said port is *NOT* holding the legacy SPC-2 or
2535 * SPC-3 Persistent Reservation.
2536 */
2537 }
2538
5bda90c8
CH		 2539 /*
2540 * If we operate in passthrough mode we skip most CDB emulation and
2541 * instead hand the commands down to the physical SCSI device.
2542 */
2543 passthrough =
2544 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2545
c66ac9db
NB		 2546 switch (cdb[0]) {
2547 case READ_6:
2548 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2549 if (sector_ret)
2550 goto out_unsupported_cdb;
2551 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2552 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2553 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2554 break;
2555 case READ_10:
2556 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2557 if (sector_ret)
2558 goto out_unsupported_cdb;
2559 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2560 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2561 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2562 break;
2563 case READ_12:
2564 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2565 if (sector_ret)
2566 goto out_unsupported_cdb;
2567 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2568 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2569 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2570 break;
2571 case READ_16:
2572 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2573 if (sector_ret)
2574 goto out_unsupported_cdb;
2575 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2576 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2577 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2578 break;
2579 case WRITE_6:
2580 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2581 if (sector_ret)
2582 goto out_unsupported_cdb;
2583 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2584 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2585 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2586 break;
2587 case WRITE_10:
2588 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2589 if (sector_ret)
2590 goto out_unsupported_cdb;
2591 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a
AG		 2592 cmd->t_task_lba = transport_lba_32(cdb);
2593 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2594 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2595 break;
2596 case WRITE_12:
2597 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2598 if (sector_ret)
2599 goto out_unsupported_cdb;
2600 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a
AG		 2601 cmd->t_task_lba = transport_lba_32(cdb);
2602 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2603 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2604 break;
2605 case WRITE_16:
2606 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2607 if (sector_ret)
2608 goto out_unsupported_cdb;
2609 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a
AG		 2610 cmd->t_task_lba = transport_lba_64(cdb);
2611 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2612 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2613 break;
2614 case XDWRITEREAD_10:
2615 if ((cmd->data_direction != DMA_TO_DEVICE) ||
a1d8b49a 2616 !(cmd->t_tasks_bidi))
c66ac9db
NB		 2617 goto out_invalid_cdb_field;
2618 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2619 if (sector_ret)
2620 goto out_unsupported_cdb;
2621 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2622 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 2623 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
7c1c6af3 2624
5bda90c8
CH		 2625 /*
2626 * Do now allow BIDI commands for passthrough mode.
2627 */
2628 if (passthrough)
7c1c6af3 2629 goto out_unsupported_cdb;
5bda90c8 2630
c66ac9db 2631 /*
35e0e757 2632 * Setup BIDI XOR callback to be run after I/O completion.
c66ac9db
NB		 2633 */
2634 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 2635 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2636 break;
2637 case VARIABLE_LENGTH_CMD:
2638 service_action = get_unaligned_be16(&cdb[8]);
c66ac9db
NB		 2639 switch (service_action) {
2640 case XDWRITEREAD_32:
2641 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2642 if (sector_ret)
2643 goto out_unsupported_cdb;
2644 size = transport_get_size(sectors, cdb, cmd);
2645 /*
2646 * Use WRITE_32 and READ_32 opcodes for the emulated
2647 * XDWRITE_READ_32 logic.
2648 */
a1d8b49a 2649 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 2650 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2651
5bda90c8
CH		 2652 /*
2653 * Do now allow BIDI commands for passthrough mode.
2654 */
c66ac9db 2655 if (passthrough)
7c1c6af3 2656 goto out_unsupported_cdb;
5bda90c8 2657
c66ac9db 2658 /*
35e0e757
CH		 2659 * Setup BIDI XOR callback to be run during after I/O
2660 * completion.
c66ac9db
NB		 2661 */
2662 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 2663 cmd->t_tasks_fua = (cdb[10] & 0x8);
c66ac9db
NB		 2664 break;
2665 case WRITE_SAME_32:
2666 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2667 if (sector_ret)
2668 goto out_unsupported_cdb;
dd3a5ad8 2669
6708bb27 2670 if (sectors)
12850626 2671 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2672 else {
2673 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2674 " supported\n");
2675 goto out_invalid_cdb_field;
2676 }
dd3a5ad8 2677
a1d8b49a 2678 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 2679 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2680
706d5860 2681 if (target_check_write_same_discard(&cdb[10], dev) < 0)
c66ac9db 2682 goto out_invalid_cdb_field;
5bda90c8
CH		 2683 if (!passthrough)
2684 cmd->execute_task = target_emulate_write_same;
c66ac9db
NB		 2685 break;
2686 default:
6708bb27 2687 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 2688 " 0x%04x not supported\n", service_action);
2689 goto out_unsupported_cdb;
2690 }
2691 break;
e434f1f1 2692 case MAINTENANCE_IN:
e3d6f909 2693 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2694 /* MAINTENANCE_IN from SCC-2 */
2695 /*
2696 * Check for emulated MI_REPORT_TARGET_PGS.
2697 */
e76a35d6
CH		 2698 if (cdb[1] == MI_REPORT_TARGET_PGS &&
2699 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2700 cmd->execute_task =
2701 target_emulate_report_target_port_groups;
c66ac9db
NB		 2702 }
2703 size = (cdb[6] << 24) | (cdb[7] << 16) |
2704 (cdb[8] << 8) | cdb[9];
2705 } else {
2706 /* GPCMD_SEND_KEY from multi media commands */
2707 size = (cdb[8] << 8) + cdb[9];
2708 }
05d1c7c0 2709 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2710 break;
2711 case MODE_SELECT:
2712 size = cdb[4];
2713 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2714 break;
2715 case MODE_SELECT_10:
2716 size = (cdb[7] << 8) + cdb[8];
2717 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2718 break;
2719 case MODE_SENSE:
2720 size = cdb[4];
05d1c7c0 2721 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2722 if (!passthrough)
2723 cmd->execute_task = target_emulate_modesense;
c66ac9db
NB		 2724 break;
2725 case MODE_SENSE_10:
5bda90c8
CH		 2726 size = (cdb[7] << 8) + cdb[8];
2727 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2728 if (!passthrough)
2729 cmd->execute_task = target_emulate_modesense;
2730 break;
c66ac9db
NB		 2731 case GPCMD_READ_BUFFER_CAPACITY:
2732 case GPCMD_SEND_OPC:
2733 case LOG_SELECT:
2734 case LOG_SENSE:
2735 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2736 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2737 break;
2738 case READ_BLOCK_LIMITS:
2739 size = READ_BLOCK_LEN;
05d1c7c0 2740 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2741 break;
2742 case GPCMD_GET_CONFIGURATION:
2743 case GPCMD_READ_FORMAT_CAPACITIES:
2744 case GPCMD_READ_DISC_INFO:
2745 case GPCMD_READ_TRACK_RZONE_INFO:
2746 size = (cdb[7] << 8) + cdb[8];
2747 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2748 break;
2749 case PERSISTENT_RESERVE_IN:
617c0e06 2750 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
e76a35d6 2751 cmd->execute_task = target_scsi3_emulate_pr_in;
617c0e06
CH		 2752 size = (cdb[7] << 8) + cdb[8];
2753 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2754 break;
c66ac9db 2755 case PERSISTENT_RESERVE_OUT:
617c0e06 2756 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
e76a35d6 2757 cmd->execute_task = target_scsi3_emulate_pr_out;
c66ac9db 2758 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2759 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2760 break;
2761 case GPCMD_MECHANISM_STATUS:
2762 case GPCMD_READ_DVD_STRUCTURE:
2763 size = (cdb[8] << 8) + cdb[9];
2764 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2765 break;
2766 case READ_POSITION:
2767 size = READ_POSITION_LEN;
05d1c7c0 2768 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 2769 break;
e434f1f1 2770 case MAINTENANCE_OUT:
e3d6f909 2771 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2772 /* MAINTENANCE_OUT from SCC-2
2773 *
2774 * Check for emulated MO_SET_TARGET_PGS.
2775 */
e76a35d6
CH		 2776 if (cdb[1] == MO_SET_TARGET_PGS &&
2777 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2778 cmd->execute_task =
2779 target_emulate_set_target_port_groups;
c66ac9db
NB		 2780 }
2781
2782 size = (cdb[6] << 24) | (cdb[7] << 16) |
2783 (cdb[8] << 8) | cdb[9];
2784 } else {
2785 /* GPCMD_REPORT_KEY from multi media commands */
2786 size = (cdb[8] << 8) + cdb[9];
2787 }
05d1c7c0 2788 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2789 break;
2790 case INQUIRY:
2791 size = (cdb[3] << 8) + cdb[4];
2792 /*
2793 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2794 * See spc4r17 section 5.3
2795 */
5951146d 2796 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 2797 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 2798 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2799 if (!passthrough)
2800 cmd->execute_task = target_emulate_inquiry;
c66ac9db
NB		 2801 break;
2802 case READ_BUFFER:
2803 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2804 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2805 break;
2806 case READ_CAPACITY:
2807 size = READ_CAP_LEN;
05d1c7c0 2808 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2809 if (!passthrough)
2810 cmd->execute_task = target_emulate_readcapacity;
c66ac9db
NB		 2811 break;
2812 case READ_MEDIA_SERIAL_NUMBER:
2813 case SECURITY_PROTOCOL_IN:
2814 case SECURITY_PROTOCOL_OUT:
2815 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 2816 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2817 break;
2818 case SERVICE_ACTION_IN:
5bda90c8
CH		 2819 switch (cmd->t_task_cdb[1] & 0x1f) {
2820 case SAI_READ_CAPACITY_16:
2821 if (!passthrough)
2822 cmd->execute_task =
2823 target_emulate_readcapacity_16;
2824 break;
2825 default:
2826 if (passthrough)
2827 break;
2828
2829 pr_err("Unsupported SA: 0x%02x\n",
2830 cmd->t_task_cdb[1] & 0x1f);
2831 goto out_unsupported_cdb;
2832 }
2833 /*FALLTHROUGH*/
c66ac9db
NB		 2834 case ACCESS_CONTROL_IN:
2835 case ACCESS_CONTROL_OUT:
2836 case EXTENDED_COPY:
2837 case READ_ATTRIBUTE:
2838 case RECEIVE_COPY_RESULTS:
2839 case WRITE_ATTRIBUTE:
2840 size = (cdb[10] << 24) | (cdb[11] << 16) |
2841 (cdb[12] << 8) | cdb[13];
05d1c7c0 2842 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2843 break;
2844 case RECEIVE_DIAGNOSTIC:
2845 case SEND_DIAGNOSTIC:
2846 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 2847 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2848 break;
2849/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2850#if 0
2851 case GPCMD_READ_CD:
2852 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2853 size = (2336 * sectors);
05d1c7c0 2854 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2855 break;
2856#endif
2857 case READ_TOC:
2858 size = cdb[8];
05d1c7c0 2859 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2860 break;
2861 case REQUEST_SENSE:
2862 size = cdb[4];
05d1c7c0 2863 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2864 if (!passthrough)
2865 cmd->execute_task = target_emulate_request_sense;
c66ac9db
NB		 2866 break;
2867 case READ_ELEMENT_STATUS:
2868 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 2869 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2870 break;
2871 case WRITE_BUFFER:
2872 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2873 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2874 break;
2875 case RESERVE:
2876 case RESERVE_10:
2877 /*
2878 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2879 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2880 */
2881 if (cdb[0] == RESERVE_10)
2882 size = (cdb[7] << 8) | cdb[8];
2883 else
2884 size = cmd->data_length;
2885
2886 /*
2887 * Setup the legacy emulated handler for SPC-2 and
2888 * >= SPC-3 compatible reservation handling (CRH=1)
2889 * Otherwise, we assume the underlying SCSI logic is
2890 * is running in SPC_PASSTHROUGH, and wants reservations
2891 * emulation disabled.
2892 */
e76a35d6
CH		 2893 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2894 cmd->execute_task = target_scsi2_reservation_reserve;
c66ac9db
NB		 2895 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2896 break;
2897 case RELEASE:
2898 case RELEASE_10:
2899 /*
2900 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2901 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2902 */
2903 if (cdb[0] == RELEASE_10)
2904 size = (cdb[7] << 8) | cdb[8];
2905 else
2906 size = cmd->data_length;
2907
e76a35d6
CH		 2908 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2909 cmd->execute_task = target_scsi2_reservation_release;
c66ac9db
NB		 2910 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2911 break;
2912 case SYNCHRONIZE_CACHE:
2913 case 0x91: /* SYNCHRONIZE_CACHE_16: */
2914 /*
2915 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2916 */
2917 if (cdb[0] == SYNCHRONIZE_CACHE) {
2918 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 2919 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2920 } else {
2921 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 2922 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2923 }
2924 if (sector_ret)
2925 goto out_unsupported_cdb;
2926
2927 size = transport_get_size(sectors, cdb, cmd);
2928 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2929
5bda90c8 2930 if (passthrough)
c66ac9db 2931 break;
5bda90c8 2932
c66ac9db
NB		 2933 /*
2934 * Check to ensure that LBA + Range does not exceed past end of
7abbe7f3 2935 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
c66ac9db 2936 */
7abbe7f3
NB		 2937 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
2938 if (transport_cmd_get_valid_sectors(cmd) < 0)
2939 goto out_invalid_cdb_field;
2940 }
5bda90c8 2941 cmd->execute_task = target_emulate_synchronize_cache;
c66ac9db
NB		 2942 break;
2943 case UNMAP:
2944 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 2945 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2946 if (!passthrough)
2947 cmd->execute_task = target_emulate_unmap;
c66ac9db
NB		 2948 break;
2949 case WRITE_SAME_16:
2950 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2951 if (sector_ret)
2952 goto out_unsupported_cdb;
dd3a5ad8 2953
6708bb27 2954 if (sectors)
12850626 2955 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2956 else {
2957 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2958 goto out_invalid_cdb_field;
2959 }
dd3a5ad8 2960
5db0753b 2961 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
706d5860
NB		 2962 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2963
2964 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2965 goto out_invalid_cdb_field;
5bda90c8
CH		 2966 if (!passthrough)
2967 cmd->execute_task = target_emulate_write_same;
706d5860
NB		 2968 break;
2969 case WRITE_SAME:
2970 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2971 if (sector_ret)
2972 goto out_unsupported_cdb;
2973
2974 if (sectors)
12850626 2975 size = transport_get_size(1, cdb, cmd);
706d5860
NB		 2976 else {
2977 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2978 goto out_invalid_cdb_field;
c66ac9db 2979 }
706d5860
NB		 2980
2981 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
c66ac9db 2982 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
706d5860
NB		 2983 /*
2984 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
2985 * of byte 1 bit 3 UNMAP instead of original reserved field
2986 */
2987 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2988 goto out_invalid_cdb_field;
5bda90c8
CH		 2989 if (!passthrough)
2990 cmd->execute_task = target_emulate_write_same;
c66ac9db
NB		 2991 break;
2992 case ALLOW_MEDIUM_REMOVAL:
c66ac9db 2993 case ERASE:
c66ac9db
NB		 2994 case REZERO_UNIT:
2995 case SEEK_10:
c66ac9db
NB		 2996 case SPACE:
2997 case START_STOP:
2998 case TEST_UNIT_READY:
2999 case VERIFY:
3000 case WRITE_FILEMARKS:
5bda90c8
CH		 3001 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3002 if (!passthrough)
3003 cmd->execute_task = target_emulate_noop;
3004 break;
3005 case GPCMD_CLOSE_TRACK:
3006 case INITIALIZE_ELEMENT_STATUS:
3007 case GPCMD_LOAD_UNLOAD:
3008 case GPCMD_SET_SPEED:
c66ac9db
NB		 3009 case MOVE_MEDIUM:
3010 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3011 break;
3012 case REPORT_LUNS:
e76a35d6 3013 cmd->execute_task = target_report_luns;
c66ac9db
NB		 3014 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3015 /*
3016 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3017 * See spc4r17 section 5.3
3018 */
5951146d 3019 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3020 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3021 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3022 break;
3023 default:
6708bb27 3024 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 3025 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3026 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3027 goto out_unsupported_cdb;
3028 }
3029
3030 if (size != cmd->data_length) {
6708bb27 3031 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 3032 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3033 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3034 cmd->data_length, size, cdb[0]);
3035
3036 cmd->cmd_spdtl = size;
3037
3038 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 3039 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 3040 " WRITE data\n");
3041 goto out_invalid_cdb_field;
3042 }
3043 /*
3044 * Reject READ_* or WRITE_* with overflow/underflow for
3045 * type SCF_SCSI_DATA_SG_IO_CDB.
3046 */
6708bb27
AG		 3047 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3048 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 3049 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3050 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3051 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3052 goto out_invalid_cdb_field;
3053 }
3054
3055 if (size > cmd->data_length) {
3056 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3057 cmd->residual_count = (size - cmd->data_length);
3058 } else {
3059 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3060 cmd->residual_count = (cmd->data_length - size);
3061 }
3062 cmd->data_length = size;
3063 }
3064
5bda90c8
CH		 3065 /* reject any command that we don't have a handler for */
3066 if (!(passthrough || cmd->execute_task ||
3067 (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
3068 goto out_unsupported_cdb;
3069
d0229ae3
AG		 3070 /* Let's limit control cdbs to a page, for simplicity's sake. */
3071 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3072 size > PAGE_SIZE)
3073 goto out_invalid_cdb_field;
3074
c66ac9db
NB		 3075 transport_set_supported_SAM_opcode(cmd);
3076 return ret;
3077
3078out_unsupported_cdb:
3079 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3080 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3081 return -EINVAL;
c66ac9db
NB		 3082out_invalid_cdb_field:
3083 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3084 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3085 return -EINVAL;
c66ac9db
NB		 3086}
3087
c66ac9db 3088/*
35e0e757 3089 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 3090 * and ordered cmds need to have their tasks added to the execution queue.
3091 */
3092static void transport_complete_task_attr(struct se_cmd *cmd)
3093{
5951146d 3094 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3095 struct se_cmd *cmd_p, *cmd_tmp;
3096 int new_active_tasks = 0;
3097
e66ecd50 3098 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3099 atomic_dec(&dev->simple_cmds);
3100 smp_mb__after_atomic_dec();
3101 dev->dev_cur_ordered_id++;
6708bb27 3102 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3103 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3104 cmd->se_ordered_id);
e66ecd50 3105 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 3106 atomic_dec(&dev->dev_hoq_count);
3107 smp_mb__after_atomic_dec();
3108 dev->dev_cur_ordered_id++;
6708bb27 3109 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3110 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3111 cmd->se_ordered_id);
e66ecd50 3112 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db 3113 spin_lock(&dev->ordered_cmd_lock);
5951146d 3114 list_del(&cmd->se_ordered_node);
c66ac9db
NB		 3115 atomic_dec(&dev->dev_ordered_sync);
3116 smp_mb__after_atomic_dec();
3117 spin_unlock(&dev->ordered_cmd_lock);
3118
3119 dev->dev_cur_ordered_id++;
6708bb27 3120 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3121 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3122 }
3123 /*
3124 * Process all commands up to the last received
3125 * ORDERED task attribute which requires another blocking
3126 * boundary
3127 */
3128 spin_lock(&dev->delayed_cmd_lock);
3129 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3130 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3131
5951146d 3132 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3133 spin_unlock(&dev->delayed_cmd_lock);
3134
6708bb27 3135 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3136 " cmd_p: 0x%02x Task Attr: 0x%02x"
3137 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3138 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3139 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3140
3141 transport_add_tasks_from_cmd(cmd_p);
3142 new_active_tasks++;
3143
3144 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3145 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3146 break;
3147 }
3148 spin_unlock(&dev->delayed_cmd_lock);
3149 /*
3150 * If new tasks have become active, wake up the transport thread
3151 * to do the processing of the Active tasks.
3152 */
3153 if (new_active_tasks != 0)
e3d6f909 3154 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3155}
3156
e057f533 3157static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 3158{
3159 int ret = 0;
3160
e057f533
CH		 3161 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3162 transport_complete_task_attr(cmd);
3163
3164 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3165 ret = cmd->se_tfo->queue_status(cmd);
3166 if (ret)
3167 goto out;
3168 }
07bde79a
NB		 3169
3170 switch (cmd->data_direction) {
3171 case DMA_FROM_DEVICE:
3172 ret = cmd->se_tfo->queue_data_in(cmd);
3173 break;
3174 case DMA_TO_DEVICE:
ec98f782 3175 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3176 ret = cmd->se_tfo->queue_data_in(cmd);
3177 if (ret < 0)
e057f533 3178 break;
07bde79a
NB		 3179 }
3180 /* Fall through for DMA_TO_DEVICE */
3181 case DMA_NONE:
3182 ret = cmd->se_tfo->queue_status(cmd);
3183 break;
3184 default:
3185 break;
3186 }
3187
e057f533
CH		 3188out:
3189 if (ret < 0) {
3190 transport_handle_queue_full(cmd, cmd->se_dev);
3191 return;
3192 }
3193 transport_lun_remove_cmd(cmd);
3194 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3195}
3196
3197static void transport_handle_queue_full(
3198 struct se_cmd *cmd,
e057f533 3199 struct se_device *dev)
07bde79a
NB		 3200{
3201 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 3202 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3203 atomic_inc(&dev->dev_qf_count);
3204 smp_mb__after_atomic_inc();
3205 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3206
3207 schedule_work(&cmd->se_dev->qf_work_queue);
3208}
3209
35e0e757 3210static void target_complete_ok_work(struct work_struct *work)
c66ac9db 3211{
35e0e757 3212 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
07bde79a 3213 int reason = 0, ret;
35e0e757 3214
c66ac9db
NB		 3215 /*
3216 * Check if we need to move delayed/dormant tasks from cmds on the
3217 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3218 * Attribute.
3219 */
5951146d 3220 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3221 transport_complete_task_attr(cmd);
07bde79a
NB		 3222 /*
3223 * Check to schedule QUEUE_FULL work, or execute an existing
3224 * cmd->transport_qf_callback()
3225 */
3226 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3227 schedule_work(&cmd->se_dev->qf_work_queue);
3228
c66ac9db
NB		 3229 /*
3230 * Check if we need to retrieve a sense buffer from
3231 * the struct se_cmd in question.
3232 */
3233 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3234 if (transport_get_sense_data(cmd) < 0)
3235 reason = TCM_NON_EXISTENT_LUN;
3236
3237 /*
3238 * Only set when an struct se_task->task_scsi_status returned
3239 * a non GOOD status.
3240 */
3241 if (cmd->scsi_status) {
07bde79a 3242 ret = transport_send_check_condition_and_sense(
c66ac9db 3243 cmd, reason, 1);
f147abb4 3244 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3245 goto queue_full;
3246
c66ac9db
NB		 3247 transport_lun_remove_cmd(cmd);
3248 transport_cmd_check_stop_to_fabric(cmd);
3249 return;
3250 }
3251 }
3252 /*
25985edc 3253 * Check for a callback, used by amongst other things
c66ac9db
NB		 3254 * XDWRITE_READ_10 emulation.
3255 */
3256 if (cmd->transport_complete_callback)
3257 cmd->transport_complete_callback(cmd);
3258
3259 switch (cmd->data_direction) {
3260 case DMA_FROM_DEVICE:
3261 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3262 if (cmd->se_lun->lun_sep) {
3263 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3264 cmd->data_length;
3265 }
3266 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3267
07bde79a 3268 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3269 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3270 goto queue_full;
c66ac9db
NB		 3271 break;
3272 case DMA_TO_DEVICE:
3273 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3274 if (cmd->se_lun->lun_sep) {
3275 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3276 cmd->data_length;
3277 }
3278 spin_unlock(&cmd->se_lun->lun_sep_lock);
3279 /*
3280 * Check if we need to send READ payload for BIDI-COMMAND
3281 */
ec98f782 3282 if (cmd->t_bidi_data_sg) {
c66ac9db 3283 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3284 if (cmd->se_lun->lun_sep) {
3285 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3286 cmd->data_length;
3287 }
3288 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 3289 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3290 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3291 goto queue_full;
c66ac9db
NB		 3292 break;
3293 }
3294 /* Fall through for DMA_TO_DEVICE */
3295 case DMA_NONE:
07bde79a 3296 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 3297 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3298 goto queue_full;
c66ac9db
NB		 3299 break;
3300 default:
3301 break;
3302 }
3303
3304 transport_lun_remove_cmd(cmd);
3305 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3306 return;
3307
3308queue_full:
6708bb27 3309 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 3310 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 3311 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3312 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 3313}
3314
3315static void transport_free_dev_tasks(struct se_cmd *cmd)
3316{
3317 struct se_task *task, *task_tmp;
3318 unsigned long flags;
0c2cfe5f 3319 LIST_HEAD(dispose_list);
c66ac9db 3320
a1d8b49a 3321 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3322 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3323 &cmd->t_task_list, t_list) {
0c2cfe5f
CH		 3324 if (!(task->task_flags & TF_ACTIVE))
3325 list_move_tail(&task->t_list, &dispose_list);
3326 }
3327 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3328
3329 while (!list_empty(&dispose_list)) {
3330 task = list_first_entry(&dispose_list, struct se_task, t_list);
c66ac9db 3331
af3f00c7
CH		 3332 if (task->task_sg != cmd->t_data_sg &&
3333 task->task_sg != cmd->t_bidi_data_sg)
3334 kfree(task->task_sg);
c66ac9db
NB		 3335
3336 list_del(&task->t_list);
3337
42bf829e 3338 cmd->se_dev->transport->free_task(task);
c66ac9db 3339 }
c66ac9db
NB		 3340}
3341
6708bb27 3342static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3343{
ec98f782 3344 struct scatterlist *sg;
ec98f782 3345 int count;
c66ac9db 3346
6708bb27
AG		 3347 for_each_sg(sgl, sg, nents, count)
3348 __free_page(sg_page(sg));
c66ac9db 3349
6708bb27
AG		 3350 kfree(sgl);
3351}
c66ac9db 3352
6708bb27
AG		 3353static inline void transport_free_pages(struct se_cmd *cmd)
3354{
3355 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3356 return;
3357
3358 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3359 cmd->t_data_sg = NULL;
3360 cmd->t_data_nents = 0;
c66ac9db 3361
6708bb27 3362 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3363 cmd->t_bidi_data_sg = NULL;
3364 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3365}
3366
d3df7825
CH		 3367/**
3368 * transport_put_cmd - release a reference to a command
3369 * @cmd: command to release
3370 *
3371 * This routine releases our reference to the command and frees it if possible.
3372 */
39c05f32 3373static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 3374{
3375 unsigned long flags;
4911e3cc 3376 int free_tasks = 0;
c66ac9db 3377
a1d8b49a 3378 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 3379 if (atomic_read(&cmd->t_fe_count)) {
3380 if (!atomic_dec_and_test(&cmd->t_fe_count))
3381 goto out_busy;
3382 }
3383
3384 if (atomic_read(&cmd->t_se_count)) {
3385 if (!atomic_dec_and_test(&cmd->t_se_count))
3386 goto out_busy;
3387 }
3388
3389 if (atomic_read(&cmd->transport_dev_active)) {
3390 atomic_set(&cmd->transport_dev_active, 0);
3391 transport_all_task_dev_remove_state(cmd);
3392 free_tasks = 1;
c66ac9db 3393 }
a1d8b49a 3394 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3395
4911e3cc
CH		 3396 if (free_tasks != 0)
3397 transport_free_dev_tasks(cmd);
d3df7825 3398
c66ac9db 3399 transport_free_pages(cmd);
31afc39c 3400 transport_release_cmd(cmd);
39c05f32 3401 return;
4911e3cc
CH		 3402out_busy:
3403 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3404}
3405
c66ac9db 3406/*
ec98f782
AG		 3407 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3408 * allocating in the core.
c66ac9db
NB		 3409 * @cmd: Associated se_cmd descriptor
3410 * @mem: SGL style memory for TCM WRITE / READ
3411 * @sg_mem_num: Number of SGL elements
3412 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3413 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3414 *
3415 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3416 * of parameters.
3417 */
3418int transport_generic_map_mem_to_cmd(
3419 struct se_cmd *cmd,
5951146d
AG		 3420 struct scatterlist *sgl,
3421 u32 sgl_count,
3422 struct scatterlist *sgl_bidi,
3423 u32 sgl_bidi_count)
c66ac9db 3424{
5951146d 3425 if (!sgl || !sgl_count)
c66ac9db 3426 return 0;
c66ac9db 3427
c66ac9db
NB		 3428 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3429 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
c66ac9db 3430
ec98f782
AG		 3431 cmd->t_data_sg = sgl;
3432 cmd->t_data_nents = sgl_count;
c66ac9db 3433
ec98f782
AG		 3434 if (sgl_bidi && sgl_bidi_count) {
3435 cmd->t_bidi_data_sg = sgl_bidi;
3436 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3437 }
3438 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3439 }
3440
3441 return 0;
3442}
3443EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3444
05d1c7c0
AG		 3445void *transport_kmap_first_data_page(struct se_cmd *cmd)
3446{
ec98f782 3447 struct scatterlist *sg = cmd->t_data_sg;
05d1c7c0 3448
ec98f782 3449 BUG_ON(!sg);
05d1c7c0 3450 /*
ec98f782
AG		 3451 * We need to take into account a possible offset here for fabrics like
3452 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3453 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3454 */
ec98f782 3455 return kmap(sg_page(sg)) + sg->offset;
05d1c7c0
AG		 3456}
3457EXPORT_SYMBOL(transport_kmap_first_data_page);
3458
3459void transport_kunmap_first_data_page(struct se_cmd *cmd)
3460{
ec98f782 3461 kunmap(sg_page(cmd->t_data_sg));
05d1c7c0
AG		 3462}
3463EXPORT_SYMBOL(transport_kunmap_first_data_page);
3464
c66ac9db 3465static int
05d1c7c0 3466transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3467{
ec98f782
AG		 3468 u32 length = cmd->data_length;
3469 unsigned int nents;
3470 struct page *page;
3471 int i = 0;
c66ac9db 3472
ec98f782
AG		 3473 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3474 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3475 if (!cmd->t_data_sg)
3476 return -ENOMEM;
c66ac9db 3477
ec98f782
AG		 3478 cmd->t_data_nents = nents;
3479 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3480
ec98f782
AG		 3481 while (length) {
3482 u32 page_len = min_t(u32, length, PAGE_SIZE);
3483 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3484 if (!page)
3485 goto out;
c66ac9db 3486
ec98f782
AG		 3487 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3488 length -= page_len;
3489 i++;
c66ac9db 3490 }
c66ac9db 3491 return 0;
c66ac9db 3492
ec98f782
AG		 3493out:
3494 while (i >= 0) {
3495 __free_page(sg_page(&cmd->t_data_sg[i]));
3496 i--;
c66ac9db 3497 }
ec98f782
AG		 3498 kfree(cmd->t_data_sg);
3499 cmd->t_data_sg = NULL;
3500 return -ENOMEM;
c66ac9db
NB		 3501}
3502
a1d8b49a
AG		 3503/* Reduce sectors if they are too long for the device */
3504static inline sector_t transport_limit_task_sectors(
c66ac9db
NB		 3505 struct se_device *dev,
3506 unsigned long long lba,
a1d8b49a 3507 sector_t sectors)
c66ac9db 3508{
a1d8b49a 3509 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db 3510
a1d8b49a
AG		 3511 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3512 if ((lba + sectors) > transport_dev_end_lba(dev))
3513 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
c66ac9db 3514
a1d8b49a 3515 return sectors;
c66ac9db
NB		 3516}
3517
c66ac9db
NB		 3518
3519/*
3520 * This function can be used by HW target mode drivers to create a linked
3521 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3522 * This is intended to be called during the completion path by TCM Core
3523 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3524 */
3525void transport_do_task_sg_chain(struct se_cmd *cmd)
3526{
ec98f782
AG		 3527 struct scatterlist *sg_first = NULL;
3528 struct scatterlist *sg_prev = NULL;
3529 int sg_prev_nents = 0;
3530 struct scatterlist *sg;
c66ac9db 3531 struct se_task *task;
ec98f782 3532 u32 chained_nents = 0;
c66ac9db
NB		 3533 int i;
3534
ec98f782
AG		 3535 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3536
c66ac9db
NB		 3537 /*
3538 * Walk the struct se_task list and setup scatterlist chains
a1d8b49a 3539 * for each contiguously allocated struct se_task->task_sg[].
c66ac9db 3540 */
a1d8b49a 3541 list_for_each_entry(task, &cmd->t_task_list, t_list) {
ec98f782 3542 if (!task->task_sg)
c66ac9db
NB		 3543 continue;
3544
ec98f782
AG		 3545 if (!sg_first) {
3546 sg_first = task->task_sg;
6708bb27 3547 chained_nents = task->task_sg_nents;
97868c89 3548 } else {
ec98f782 3549 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
6708bb27 3550 chained_nents += task->task_sg_nents;
97868c89 3551 }
c3c74c7a
NB		 3552 /*
3553 * For the padded tasks, use the extra SGL vector allocated
3554 * in transport_allocate_data_tasks() for the sg_prev_nents
04629b7b
CH		 3555 * offset into sg_chain() above.
3556 *
3557 * We do not need the padding for the last task (or a single
3558 * task), but in that case we will never use the sg_prev_nents
3559 * value below which would be incorrect.
c3c74c7a 3560 */
04629b7b 3561 sg_prev_nents = (task->task_sg_nents + 1);
ec98f782 3562 sg_prev = task->task_sg;
c66ac9db
NB		 3563 }
3564 /*
3565 * Setup the starting pointer and total t_tasks_sg_linked_no including
3566 * padding SGs for linking and to mark the end.
3567 */
a1d8b49a 3568 cmd->t_tasks_sg_chained = sg_first;
ec98f782 3569 cmd->t_tasks_sg_chained_no = chained_nents;
c66ac9db 3570
6708bb27 3571 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
a1d8b49a
AG		 3572 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3573 cmd->t_tasks_sg_chained_no);
c66ac9db 3574
a1d8b49a
AG		 3575 for_each_sg(cmd->t_tasks_sg_chained, sg,
3576 cmd->t_tasks_sg_chained_no, i) {
c66ac9db 3577
6708bb27 3578 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
5951146d 3579 i, sg, sg_page(sg), sg->length, sg->offset);
c66ac9db 3580 if (sg_is_chain(sg))
6708bb27 3581 pr_debug("SG: %p sg_is_chain=1\n", sg);
c66ac9db 3582 if (sg_is_last(sg))
6708bb27 3583 pr_debug("SG: %p sg_is_last=1\n", sg);
c66ac9db 3584 }
c66ac9db
NB		 3585}
3586EXPORT_SYMBOL(transport_do_task_sg_chain);
3587
a1d8b49a
AG		 3588/*
3589 * Break up cmd into chunks transport can handle
3590 */
38b40067
CH		 3591static int
3592transport_allocate_data_tasks(struct se_cmd *cmd,
c66ac9db 3593 enum dma_data_direction data_direction,
38b40067 3594 struct scatterlist *cmd_sg, unsigned int sgl_nents)
c66ac9db 3595{
5951146d 3596 struct se_device *dev = cmd->se_dev;
a3eedc22 3597 int task_count, i;
38b40067
CH		 3598 unsigned long long lba;
3599 sector_t sectors, dev_max_sectors;
3600 u32 sector_size;
3601
3602 if (transport_cmd_get_valid_sectors(cmd) < 0)
3603 return -EINVAL;
3604
3605 dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3606 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
a1d8b49a 3607
ec98f782 3608 WARN_ON(cmd->data_length % sector_size);
38b40067
CH		 3609
3610 lba = cmd->t_task_lba;
ec98f782 3611 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
277c5f27 3612 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
af3f00c7
CH		 3613
3614 /*
3615 * If we need just a single task reuse the SG list in the command
3616 * and avoid a lot of work.
3617 */
3618 if (task_count == 1) {
3619 struct se_task *task;
3620 unsigned long flags;
3621
3622 task = transport_generic_get_task(cmd, data_direction);
3623 if (!task)
3624 return -ENOMEM;
3625
3626 task->task_sg = cmd_sg;
3627 task->task_sg_nents = sgl_nents;
3628
3629 task->task_lba = lba;
3630 task->task_sectors = sectors;
3631 task->task_size = task->task_sectors * sector_size;
3632
3633 spin_lock_irqsave(&cmd->t_state_lock, flags);
3634 list_add_tail(&task->t_list, &cmd->t_task_list);
3635 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3636
3637 return task_count;
3638 }
3639
ec98f782 3640 for (i = 0; i < task_count; i++) {
38b40067 3641 struct se_task *task;
c3c74c7a 3642 unsigned int task_size, task_sg_nents_padded;
38b40067
CH		 3643 struct scatterlist *sg;
3644 unsigned long flags;
ec98f782 3645 int count;
a1d8b49a 3646
c66ac9db 3647 task = transport_generic_get_task(cmd, data_direction);
a1d8b49a 3648 if (!task)
ec98f782 3649 return -ENOMEM;
c66ac9db 3650
c66ac9db 3651 task->task_lba = lba;
ec98f782
AG		 3652 task->task_sectors = min(sectors, dev_max_sectors);
3653 task->task_size = task->task_sectors * sector_size;
c66ac9db 3654
525a48a2
NB		 3655 /*
3656 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3657 * in order to calculate the number per task SGL entries
3658 */
3659 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
c66ac9db 3660 /*
ec98f782
AG		 3661 * Check if the fabric module driver is requesting that all
3662 * struct se_task->task_sg[] be chained together.. If so,
3663 * then allocate an extra padding SG entry for linking and
c3c74c7a
NB		 3664 * marking the end of the chained SGL for every task except
3665 * the last one for (task_count > 1) operation, or skipping
3666 * the extra padding for the (task_count == 1) case.
c66ac9db 3667 */
c3c74c7a
NB		 3668 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3669 task_sg_nents_padded = (task->task_sg_nents + 1);
c3c74c7a
NB		 3670 } else
3671 task_sg_nents_padded = task->task_sg_nents;
c66ac9db 3672
1d20bb61 3673 task->task_sg = kmalloc(sizeof(struct scatterlist) *
c3c74c7a 3674 task_sg_nents_padded, GFP_KERNEL);
ec98f782
AG		 3675 if (!task->task_sg) {
3676 cmd->se_dev->transport->free_task(task);
3677 return -ENOMEM;
3678 }
3679
c3c74c7a 3680 sg_init_table(task->task_sg, task_sg_nents_padded);
c66ac9db 3681
ec98f782
AG		 3682 task_size = task->task_size;
3683
3684 /* Build new sgl, only up to task_size */
6708bb27 3685 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
ec98f782
AG		 3686 if (cmd_sg->length > task_size)
3687 break;
3688
3689 *sg = *cmd_sg;
3690 task_size -= cmd_sg->length;
3691 cmd_sg = sg_next(cmd_sg);
c66ac9db 3692 }
c66ac9db 3693
ec98f782
AG		 3694 lba += task->task_sectors;
3695 sectors -= task->task_sectors;
c66ac9db 3696
ec98f782
AG		 3697 spin_lock_irqsave(&cmd->t_state_lock, flags);
3698 list_add_tail(&task->t_list, &cmd->t_task_list);
3699 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3700 }
3701
ec98f782 3702 return task_count;
c66ac9db
NB		 3703}
3704
3705static int
ec98f782 3706transport_allocate_control_task(struct se_cmd *cmd)
c66ac9db 3707{
c66ac9db 3708 struct se_task *task;
ec98f782 3709 unsigned long flags;
c66ac9db
NB		 3710
3711 task = transport_generic_get_task(cmd, cmd->data_direction);
3712 if (!task)
ec98f782 3713 return -ENOMEM;
c66ac9db 3714
af3f00c7 3715 task->task_sg = cmd->t_data_sg;
c66ac9db 3716 task->task_size = cmd->data_length;
6708bb27 3717 task->task_sg_nents = cmd->t_data_nents;
c66ac9db 3718
ec98f782
AG		 3719 spin_lock_irqsave(&cmd->t_state_lock, flags);
3720 list_add_tail(&task->t_list, &cmd->t_task_list);
3721 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3722
6708bb27 3723 /* Success! Return number of tasks allocated */
a3eedc22 3724 return 1;
ec98f782
AG		 3725}
3726
da0f7619
CH		 3727/*
3728 * Allocate any required ressources to execute the command, and either place
3729 * it on the execution queue if possible. For writes we might not have the
3730 * payload yet, thus notify the fabric via a call to ->write_pending instead.
c66ac9db 3731 */
a1d8b49a 3732int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 3733{
da0f7619 3734 struct se_device *dev = cmd->se_dev;
9ac54987 3735 int task_cdbs, task_cdbs_bidi = 0;
da0f7619 3736 int set_counts = 1;
c66ac9db
NB		 3737 int ret = 0;
3738
3739 /*
3740 * Determine is the TCM fabric module has already allocated physical
3741 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 3742 * beforehand.
c66ac9db 3743 */
ec98f782
AG		 3744 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3745 cmd->data_length) {
05d1c7c0 3746 ret = transport_generic_get_mem(cmd);
c66ac9db 3747 if (ret < 0)
03e98c9e 3748 goto out_fail;
c66ac9db 3749 }
da0f7619 3750
1d20bb61 3751 /*
38b40067 3752 * For BIDI command set up the read tasks first.
1d20bb61 3753 */
da0f7619 3754 if (cmd->t_bidi_data_sg &&
38b40067
CH		 3755 dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
3756 BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB));
3757
9ac54987
NB		 3758 task_cdbs_bidi = transport_allocate_data_tasks(cmd,
3759 DMA_FROM_DEVICE, cmd->t_bidi_data_sg,
3760 cmd->t_bidi_data_nents);
3761 if (task_cdbs_bidi <= 0)
da0f7619
CH		 3762 goto out_fail;
3763
3764 atomic_inc(&cmd->t_fe_count);
3765 atomic_inc(&cmd->t_se_count);
3766 set_counts = 0;
3767 }
38b40067
CH		 3768
3769 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3770 task_cdbs = transport_allocate_data_tasks(cmd,
3771 cmd->data_direction, cmd->t_data_sg,
3772 cmd->t_data_nents);
3773 } else {
3774 task_cdbs = transport_allocate_control_task(cmd);
3775 }
3776
da0f7619
CH		 3777 if (task_cdbs <= 0)
3778 goto out_fail;
3779
3780 if (set_counts) {
3781 atomic_inc(&cmd->t_fe_count);
3782 atomic_inc(&cmd->t_se_count);
3783 }
3784
9ac54987
NB		 3785 cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi);
3786 atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num);
3787 atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num);
da0f7619 3788
c66ac9db 3789 /*
a1d8b49a 3790 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 3791 * This WRITE struct se_cmd (and all of its associated struct se_task's)
3792 * will be added to the struct se_device execution queue after its WRITE
3793 * data has arrived. (ie: It gets handled by the transport processing
3794 * thread a second time)
3795 */
3796 if (cmd->data_direction == DMA_TO_DEVICE) {
3797 transport_add_tasks_to_state_queue(cmd);
3798 return transport_generic_write_pending(cmd);
3799 }
3800 /*
3801 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
3802 * to the execution queue.
3803 */
3804 transport_execute_tasks(cmd);
3805 return 0;
da0f7619
CH		 3806
3807out_fail:
3808 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3809 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3810 return -EINVAL;
c66ac9db 3811}
a1d8b49a 3812EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 3813
3814/* transport_generic_process_write():
3815 *
3816 *
3817 */
3818void transport_generic_process_write(struct se_cmd *cmd)
3819{
c66ac9db
NB		 3820 transport_execute_tasks(cmd);
3821}
3822EXPORT_SYMBOL(transport_generic_process_write);
3823
e057f533 3824static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 3825{
f147abb4
NB		 3826 int ret;
3827
3828 ret = cmd->se_tfo->write_pending(cmd);
3829 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 3830 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3831 cmd);
3832 transport_handle_queue_full(cmd, cmd->se_dev);
3833 }
07bde79a
NB		 3834}
3835
c66ac9db
NB		 3836static int transport_generic_write_pending(struct se_cmd *cmd)
3837{
3838 unsigned long flags;
3839 int ret;
3840
a1d8b49a 3841 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3842 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 3843 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a 3844
c66ac9db
NB		 3845 /*
3846 * Clear the se_cmd for WRITE_PENDING status in order to set
a1d8b49a 3847 * cmd->t_transport_active=0 so that transport_generic_handle_data
c66ac9db 3848 * can be called from HW target mode interrupt code. This is safe
e3d6f909 3849 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 3850 * because the se_cmd->se_lun pointer is not being cleared.
3851 */
3852 transport_cmd_check_stop(cmd, 1, 0);
3853
3854 /*
3855 * Call the fabric write_pending function here to let the
3856 * frontend know that WRITE buffers are ready.
3857 */
e3d6f909 3858 ret = cmd->se_tfo->write_pending(cmd);
f147abb4 3859 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3860 goto queue_full;
3861 else if (ret < 0)
c66ac9db
NB		 3862 return ret;
3863
03e98c9e 3864 return 1;
07bde79a
NB		 3865
3866queue_full:
6708bb27 3867 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a 3868 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
e057f533 3869 transport_handle_queue_full(cmd, cmd->se_dev);
f147abb4 3870 return 0;
c66ac9db
NB		 3871}
3872
2dbc43d2
CH		 3873/**
3874 * transport_release_cmd - free a command
3875 * @cmd: command to free
3876 *
3877 * This routine unconditionally frees a command, and reference counting
3878 * or list removal must be done in the caller.
3879 */
35462975 3880void transport_release_cmd(struct se_cmd *cmd)
c66ac9db 3881{
e3d6f909 3882 BUG_ON(!cmd->se_tfo);
c66ac9db 3883
2dbc43d2
CH		 3884 if (cmd->se_tmr_req)
3885 core_tmr_release_req(cmd->se_tmr_req);
3886 if (cmd->t_task_cdb != cmd->__t_task_cdb)
3887 kfree(cmd->t_task_cdb);
a17f091d
NB		 3888 /*
3889 * Check if target_wait_for_sess_cmds() is expecting to
3890 * release se_cmd directly here..
3891 */
3892 if (cmd->check_release != 0 && cmd->se_tfo->check_release_cmd)
3893 if (cmd->se_tfo->check_release_cmd(cmd) != 0)
3894 return;
3895
35462975 3896 cmd->se_tfo->release_cmd(cmd);
c66ac9db 3897}
35462975 3898EXPORT_SYMBOL(transport_release_cmd);
c66ac9db 3899
39c05f32 3900void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 3901{
d14921d6
NB		 3902 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
3903 if (wait_for_tasks && cmd->se_tmr_req)
3904 transport_wait_for_tasks(cmd);
3905
35462975 3906 transport_release_cmd(cmd);
d14921d6
NB		 3907 } else {
3908 if (wait_for_tasks)
3909 transport_wait_for_tasks(cmd);
3910
c66ac9db
NB		 3911 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3912
82f1c8a4 3913 if (cmd->se_lun)
c66ac9db 3914 transport_lun_remove_cmd(cmd);
c66ac9db 3915
f4366772
NB		 3916 transport_free_dev_tasks(cmd);
3917
39c05f32 3918 transport_put_cmd(cmd);
c66ac9db
NB		 3919 }
3920}
3921EXPORT_SYMBOL(transport_generic_free_cmd);
3922
a17f091d
NB		 3923/* target_get_sess_cmd - Add command to active ->sess_cmd_list
3924 * @se_sess: session to reference
3925 * @se_cmd: command descriptor to add
3926 */
3927void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
3928{
3929 unsigned long flags;
3930
3931 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3932 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
3933 se_cmd->check_release = 1;
3934 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3935}
3936EXPORT_SYMBOL(target_get_sess_cmd);
3937
3938/* target_put_sess_cmd - Check for active I/O shutdown or list delete
3939 * @se_sess: session to reference
3940 * @se_cmd: command descriptor to drop
3941 */
3942int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
3943{
3944 unsigned long flags;
3945
3946 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3947 if (list_empty(&se_cmd->se_cmd_list)) {
3948 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3949 WARN_ON(1);
3950 return 0;
3951 }
3952
3953 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
3954 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3955 complete(&se_cmd->cmd_wait_comp);
3956 return 1;
3957 }
3958 list_del(&se_cmd->se_cmd_list);
3959 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3960
3961 return 0;
3962}
3963EXPORT_SYMBOL(target_put_sess_cmd);
3964
3965/* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
3966 * @se_sess: session to split
3967 */
3968void target_splice_sess_cmd_list(struct se_session *se_sess)
3969{
3970 struct se_cmd *se_cmd;
3971 unsigned long flags;
3972
3973 WARN_ON(!list_empty(&se_sess->sess_wait_list));
3974 INIT_LIST_HEAD(&se_sess->sess_wait_list);
3975
3976 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3977 se_sess->sess_tearing_down = 1;
3978
3979 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
3980
3981 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
3982 se_cmd->cmd_wait_set = 1;
3983
3984 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3985}
3986EXPORT_SYMBOL(target_splice_sess_cmd_list);
3987
3988/* target_wait_for_sess_cmds - Wait for outstanding descriptors
3989 * @se_sess: session to wait for active I/O
3990 * @wait_for_tasks: Make extra transport_wait_for_tasks call
3991 */
3992void target_wait_for_sess_cmds(
3993 struct se_session *se_sess,
3994 int wait_for_tasks)
3995{
3996 struct se_cmd *se_cmd, *tmp_cmd;
3997 bool rc = false;
3998
3999 list_for_each_entry_safe(se_cmd, tmp_cmd,
4000 &se_sess->sess_wait_list, se_cmd_list) {
4001 list_del(&se_cmd->se_cmd_list);
4002
4003 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
4004 " %d\n", se_cmd, se_cmd->t_state,
4005 se_cmd->se_tfo->get_cmd_state(se_cmd));
4006
4007 if (wait_for_tasks) {
4008 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
4009 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4010 se_cmd->se_tfo->get_cmd_state(se_cmd));
4011
4012 rc = transport_wait_for_tasks(se_cmd);
4013
4014 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
4015 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4016 se_cmd->se_tfo->get_cmd_state(se_cmd));
4017 }
4018
4019 if (!rc) {
4020 wait_for_completion(&se_cmd->cmd_wait_comp);
4021 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
4022 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4023 se_cmd->se_tfo->get_cmd_state(se_cmd));
4024 }
4025
4026 se_cmd->se_tfo->release_cmd(se_cmd);
4027 }
4028}
4029EXPORT_SYMBOL(target_wait_for_sess_cmds);
4030
c66ac9db
NB		 4031/* transport_lun_wait_for_tasks():
4032 *
4033 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4034 * an struct se_lun to be successfully shutdown.
4035 */
4036static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4037{
4038 unsigned long flags;
4039 int ret;
4040 /*
4041 * If the frontend has already requested this struct se_cmd to
4042 * be stopped, we can safely ignore this struct se_cmd.
4043 */
a1d8b49a
AG		 4044 spin_lock_irqsave(&cmd->t_state_lock, flags);
4045 if (atomic_read(&cmd->t_transport_stop)) {
4046 atomic_set(&cmd->transport_lun_stop, 0);
6708bb27 4047 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
e3d6f909 4048 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4049 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4050 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 4051 return -EPERM;
c66ac9db 4052 }
a1d8b49a
AG		 4053 atomic_set(&cmd->transport_lun_fe_stop, 1);
4054 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4055
5951146d 4056 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 4057
4058 ret = transport_stop_tasks_for_cmd(cmd);
4059
6708bb27
AG		 4060 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4061 " %d\n", cmd, cmd->t_task_list_num, ret);
c66ac9db 4062 if (!ret) {
6708bb27 4063 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 4064 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4065 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 4066 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 4067 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4068 }
3df8d40b 4069 transport_remove_cmd_from_queue(cmd);
c66ac9db
NB		 4070
4071 return 0;
4072}
4073
c66ac9db
NB		 4074static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4075{
4076 struct se_cmd *cmd = NULL;
4077 unsigned long lun_flags, cmd_flags;
4078 /*
4079 * Do exception processing and return CHECK_CONDITION status to the
4080 * Initiator Port.
4081 */
4082 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 4083 while (!list_empty(&lun->lun_cmd_list)) {
4084 cmd = list_first_entry(&lun->lun_cmd_list,
4085 struct se_cmd, se_lun_node);
4086 list_del(&cmd->se_lun_node);
4087
a1d8b49a 4088 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db
NB		 4089 /*
4090 * This will notify iscsi_target_transport.c:
4091 * transport_cmd_check_stop() that a LUN shutdown is in
4092 * progress for the iscsi_cmd_t.
4093 */
a1d8b49a 4094 spin_lock(&cmd->t_state_lock);
6708bb27 4095 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 4096 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 4097 cmd->se_lun->unpacked_lun,
4098 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a
AG		 4099 atomic_set(&cmd->transport_lun_stop, 1);
4100 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 4101
4102 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4103
6708bb27
AG		 4104 if (!cmd->se_lun) {
4105 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 4106 cmd->se_tfo->get_task_tag(cmd),
4107 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 4108 BUG();
4109 }
4110 /*
4111 * If the Storage engine still owns the iscsi_cmd_t, determine
4112 * and/or stop its context.
4113 */
6708bb27 4114 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 4115 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4116 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4117
e3d6f909 4118 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 4119 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4120 continue;
4121 }
4122
6708bb27 4123 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 4124 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 4125 cmd->se_lun->unpacked_lun,
4126 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4127
a1d8b49a 4128 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
6708bb27 4129 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 4130 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4131 goto check_cond;
4132 }
a1d8b49a 4133 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 4134 transport_all_task_dev_remove_state(cmd);
a1d8b49a 4135 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4136
4137 transport_free_dev_tasks(cmd);
4138 /*
4139 * The Storage engine stopped this struct se_cmd before it was
4140 * send to the fabric frontend for delivery back to the
4141 * Initiator Node. Return this SCSI CDB back with an
4142 * CHECK_CONDITION status.
4143 */
4144check_cond:
4145 transport_send_check_condition_and_sense(cmd,
4146 TCM_NON_EXISTENT_LUN, 0);
4147 /*
4148 * If the fabric frontend is waiting for this iscsi_cmd_t to
4149 * be released, notify the waiting thread now that LU has
4150 * finished accessing it.
4151 */
a1d8b49a
AG		 4152 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4153 if (atomic_read(&cmd->transport_lun_fe_stop)) {
6708bb27 4154 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 4155 " struct se_cmd: %p ITT: 0x%08x\n",
4156 lun->unpacked_lun,
e3d6f909 4157 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4158
a1d8b49a 4159 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 4160 cmd_flags);
4161 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 4162 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 4163 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4164 continue;
4165 }
6708bb27 4166 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 4167 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4168
a1d8b49a 4169 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4170 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4171 }
4172 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4173}
4174
4175static int transport_clear_lun_thread(void *p)
4176{
4177 struct se_lun *lun = (struct se_lun *)p;
4178
4179 __transport_clear_lun_from_sessions(lun);
4180 complete(&lun->lun_shutdown_comp);
4181
4182 return 0;
4183}
4184
4185int transport_clear_lun_from_sessions(struct se_lun *lun)
4186{
4187 struct task_struct *kt;
4188
5951146d 4189 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 4190 "tcm_cl_%u", lun->unpacked_lun);
4191 if (IS_ERR(kt)) {
6708bb27 4192 pr_err("Unable to start clear_lun thread\n");
e3d6f909 4193 return PTR_ERR(kt);
c66ac9db
NB		 4194 }
4195 wait_for_completion(&lun->lun_shutdown_comp);
4196
4197 return 0;
4198}
4199
d14921d6
NB		 4200/**
4201 * transport_wait_for_tasks - wait for completion to occur
4202 * @cmd: command to wait
c66ac9db 4203 *
d14921d6
NB		 4204 * Called from frontend fabric context to wait for storage engine
4205 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 4206 */
a17f091d 4207bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 4208{
4209 unsigned long flags;
4210
a1d8b49a 4211 spin_lock_irqsave(&cmd->t_state_lock, flags);
d14921d6
NB		 4212 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4213 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4214 return false;
d14921d6
NB		 4215 }
4216 /*
4217 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4218 * has been set in transport_set_supported_SAM_opcode().
4219 */
4220 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4221 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4222 return false;
d14921d6 4223 }
c66ac9db
NB		 4224 /*
4225 * If we are already stopped due to an external event (ie: LUN shutdown)
4226 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 4227 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 4228 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4229 * has completed its operation on the struct se_cmd.
4230 */
a1d8b49a 4231 if (atomic_read(&cmd->transport_lun_stop)) {
c66ac9db 4232
6708bb27 4233 pr_debug("wait_for_tasks: Stopping"
e3d6f909 4234 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 4235 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 4236 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4237 /*
4238 * There is a special case for WRITES where a FE exception +
4239 * LUN shutdown means ConfigFS context is still sleeping on
4240 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4241 * We go ahead and up transport_lun_stop_comp just to be sure
4242 * here.
4243 */
a1d8b49a
AG		 4244 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4245 complete(&cmd->transport_lun_stop_comp);
4246 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4247 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4248
4249 transport_all_task_dev_remove_state(cmd);
4250 /*
4251 * At this point, the frontend who was the originator of this
4252 * struct se_cmd, now owns the structure and can be released through
4253 * normal means below.
4254 */
6708bb27 4255 pr_debug("wait_for_tasks: Stopped"
e3d6f909 4256 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 4257 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 4258 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4259
a1d8b49a 4260 atomic_set(&cmd->transport_lun_stop, 0);
c66ac9db 4261 }
a1d8b49a 4262 if (!atomic_read(&cmd->t_transport_active) ||
d14921d6
NB		 4263 atomic_read(&cmd->t_transport_aborted)) {
4264 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4265 return false;
d14921d6 4266 }
c66ac9db 4267
a1d8b49a 4268 atomic_set(&cmd->t_transport_stop, 1);
c66ac9db 4269
6708bb27 4270 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
f2da9dbd
CH		 4271 " i_state: %d, t_state: %d, t_transport_stop = TRUE\n",
4272 cmd, cmd->se_tfo->get_task_tag(cmd),
4273 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 4274
a1d8b49a 4275 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4276
5951146d 4277 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 4278
a1d8b49a 4279 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 4280
a1d8b49a
AG		 4281 spin_lock_irqsave(&cmd->t_state_lock, flags);
4282 atomic_set(&cmd->t_transport_active, 0);
4283 atomic_set(&cmd->t_transport_stop, 0);
c66ac9db 4284
6708bb27 4285 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4286 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4287 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4288
d14921d6 4289 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 4290
4291 return true;
c66ac9db 4292}
d14921d6 4293EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 4294
4295static int transport_get_sense_codes(
4296 struct se_cmd *cmd,
4297 u8 *asc,
4298 u8 *ascq)
4299{
4300 *asc = cmd->scsi_asc;
4301 *ascq = cmd->scsi_ascq;
4302
4303 return 0;
4304}
4305
4306static int transport_set_sense_codes(
4307 struct se_cmd *cmd,
4308 u8 asc,
4309 u8 ascq)
4310{
4311 cmd->scsi_asc = asc;
4312 cmd->scsi_ascq = ascq;
4313
4314 return 0;
4315}
4316
4317int transport_send_check_condition_and_sense(
4318 struct se_cmd *cmd,
4319 u8 reason,
4320 int from_transport)
4321{
4322 unsigned char *buffer = cmd->sense_buffer;
4323 unsigned long flags;
4324 int offset;
4325 u8 asc = 0, ascq = 0;
4326
a1d8b49a 4327 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4328 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4329 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4330 return 0;
4331 }
4332 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4333 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4334
4335 if (!reason && from_transport)
4336 goto after_reason;
4337
4338 if (!from_transport)
4339 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4340 /*
4341 * Data Segment and SenseLength of the fabric response PDU.
4342 *
4343 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4344 * from include/scsi/scsi_cmnd.h
4345 */
e3d6f909 4346 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4347 TRANSPORT_SENSE_BUFFER);
4348 /*
4349 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4350 * SENSE KEY values from include/scsi/scsi.h
4351 */
4352 switch (reason) {
4353 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4354 /* CURRENT ERROR */
4355 buffer[offset] = 0x70;
4356 /* ILLEGAL REQUEST */
4357 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4358 /* LOGICAL UNIT NOT SUPPORTED */
4359 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4360 break;
c66ac9db
NB		 4361 case TCM_UNSUPPORTED_SCSI_OPCODE:
4362 case TCM_SECTOR_COUNT_TOO_MANY:
4363 /* CURRENT ERROR */
4364 buffer[offset] = 0x70;
4365 /* ILLEGAL REQUEST */
4366 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4367 /* INVALID COMMAND OPERATION CODE */
4368 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4369 break;
4370 case TCM_UNKNOWN_MODE_PAGE:
4371 /* CURRENT ERROR */
4372 buffer[offset] = 0x70;
4373 /* ILLEGAL REQUEST */
4374 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4375 /* INVALID FIELD IN CDB */
4376 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4377 break;
4378 case TCM_CHECK_CONDITION_ABORT_CMD:
4379 /* CURRENT ERROR */
4380 buffer[offset] = 0x70;
4381 /* ABORTED COMMAND */
4382 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4383 /* BUS DEVICE RESET FUNCTION OCCURRED */
4384 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4385 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4386 break;
4387 case TCM_INCORRECT_AMOUNT_OF_DATA:
4388 /* CURRENT ERROR */
4389 buffer[offset] = 0x70;
4390 /* ABORTED COMMAND */
4391 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4392 /* WRITE ERROR */
4393 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4394 /* NOT ENOUGH UNSOLICITED DATA */
4395 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4396 break;
4397 case TCM_INVALID_CDB_FIELD:
4398 /* CURRENT ERROR */
4399 buffer[offset] = 0x70;
4400 /* ABORTED COMMAND */
4401 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4402 /* INVALID FIELD IN CDB */
4403 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4404 break;
4405 case TCM_INVALID_PARAMETER_LIST:
4406 /* CURRENT ERROR */
4407 buffer[offset] = 0x70;
4408 /* ABORTED COMMAND */
4409 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4410 /* INVALID FIELD IN PARAMETER LIST */
4411 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4412 break;
4413 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4414 /* CURRENT ERROR */
4415 buffer[offset] = 0x70;
4416 /* ABORTED COMMAND */
4417 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4418 /* WRITE ERROR */
4419 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4420 /* UNEXPECTED_UNSOLICITED_DATA */
4421 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4422 break;
4423 case TCM_SERVICE_CRC_ERROR:
4424 /* CURRENT ERROR */
4425 buffer[offset] = 0x70;
4426 /* ABORTED COMMAND */
4427 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4428 /* PROTOCOL SERVICE CRC ERROR */
4429 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4430 /* N/A */
4431 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4432 break;
4433 case TCM_SNACK_REJECTED:
4434 /* CURRENT ERROR */
4435 buffer[offset] = 0x70;
4436 /* ABORTED COMMAND */
4437 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4438 /* READ ERROR */
4439 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4440 /* FAILED RETRANSMISSION REQUEST */
4441 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4442 break;
4443 case TCM_WRITE_PROTECTED:
4444 /* CURRENT ERROR */
4445 buffer[offset] = 0x70;
4446 /* DATA PROTECT */
4447 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4448 /* WRITE PROTECTED */
4449 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4450 break;
4451 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4452 /* CURRENT ERROR */
4453 buffer[offset] = 0x70;
4454 /* UNIT ATTENTION */
4455 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4456 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4457 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4458 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4459 break;
4460 case TCM_CHECK_CONDITION_NOT_READY:
4461 /* CURRENT ERROR */
4462 buffer[offset] = 0x70;
4463 /* Not Ready */
4464 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4465 transport_get_sense_codes(cmd, &asc, &ascq);
4466 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4467 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4468 break;
4469 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4470 default:
4471 /* CURRENT ERROR */
4472 buffer[offset] = 0x70;
4473 /* ILLEGAL REQUEST */
4474 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4475 /* LOGICAL UNIT COMMUNICATION FAILURE */
4476 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4477 break;
4478 }
4479 /*
4480 * This code uses linux/include/scsi/scsi.h SAM status codes!
4481 */
4482 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4483 /*
4484 * Automatically padded, this value is encoded in the fabric's
4485 * data_length response PDU containing the SCSI defined sense data.
4486 */
4487 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4488
4489after_reason:
07bde79a 4490 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4491}
4492EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4493
4494int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4495{
4496 int ret = 0;
4497
a1d8b49a 4498 if (atomic_read(&cmd->t_transport_aborted) != 0) {
6708bb27 4499 if (!send_status ||
c66ac9db
NB		 4500 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4501 return 1;
4502#if 0
6708bb27 4503 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4504 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4505 cmd->t_task_cdb[0],
e3d6f909 4506 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4507#endif
4508 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4509 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4510 ret = 1;
4511 }
4512 return ret;
4513}
4514EXPORT_SYMBOL(transport_check_aborted_status);
4515
4516void transport_send_task_abort(struct se_cmd *cmd)
4517{
c252f003
NB		 4518 unsigned long flags;
4519
4520 spin_lock_irqsave(&cmd->t_state_lock, flags);
4521 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4522 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4523 return;
4524 }
4525 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4526
c66ac9db
NB		 4527 /*
4528 * If there are still expected incoming fabric WRITEs, we wait
4529 * until until they have completed before sending a TASK_ABORTED
4530 * response. This response with TASK_ABORTED status will be
4531 * queued back to fabric module by transport_check_aborted_status().
4532 */
4533 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4534 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
a1d8b49a 4535 atomic_inc(&cmd->t_transport_aborted);
c66ac9db 4536 smp_mb__after_atomic_inc();
c66ac9db
NB		 4537 }
4538 }
4539 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4540#if 0
6708bb27 4541 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4542 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4543 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4544#endif
e3d6f909 4545 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4546}
4547
4548/* transport_generic_do_tmr():
4549 *
4550 *
4551 */
4552int transport_generic_do_tmr(struct se_cmd *cmd)
4553{
5951146d 4554 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4555 struct se_tmr_req *tmr = cmd->se_tmr_req;
4556 int ret;
4557
4558 switch (tmr->function) {
5c6cd613 4559 case TMR_ABORT_TASK:
c66ac9db
NB		 4560 tmr->response = TMR_FUNCTION_REJECTED;
4561 break;
5c6cd613
NB		 4562 case TMR_ABORT_TASK_SET:
4563 case TMR_CLEAR_ACA:
4564 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4565 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4566 break;
5c6cd613 4567 case TMR_LUN_RESET:
c66ac9db
NB		 4568 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4569 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4570 TMR_FUNCTION_REJECTED;
4571 break;
5c6cd613 4572 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4573 tmr->response = TMR_FUNCTION_REJECTED;
4574 break;
5c6cd613 4575 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4576 tmr->response = TMR_FUNCTION_REJECTED;
4577 break;
c66ac9db 4578 default:
6708bb27 4579 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4580 tmr->function);
4581 tmr->response = TMR_FUNCTION_REJECTED;
4582 break;
4583 }
4584
4585 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4586 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 4587
b7b8bef7 4588 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 4589 return 0;
4590}
4591
c66ac9db
NB		 4592/* transport_processing_thread():
4593 *
4594 *
4595 */
4596static int transport_processing_thread(void *param)
4597{
5951146d 4598 int ret;
c66ac9db
NB		 4599 struct se_cmd *cmd;
4600 struct se_device *dev = (struct se_device *) param;
c66ac9db 4601
c66ac9db 4602 while (!kthread_should_stop()) {
e3d6f909
AG		 4603 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4604 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 4605 kthread_should_stop());
4606 if (ret < 0)
4607 goto out;
4608
c66ac9db
NB		 4609get_cmd:
4610 __transport_execute_tasks(dev);
4611
5951146d
AG		 4612 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4613 if (!cmd)
c66ac9db
NB		 4614 continue;
4615
5951146d 4616 switch (cmd->t_state) {
680b73c5
CH		 4617 case TRANSPORT_NEW_CMD:
4618 BUG();
4619 break;
c66ac9db 4620 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 4621 if (!cmd->se_tfo->new_cmd_map) {
4622 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 4623 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4624 BUG();
4625 }
e3d6f909 4626 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db 4627 if (ret < 0) {
03e98c9e 4628 transport_generic_request_failure(cmd);
c66ac9db
NB		 4629 break;
4630 }
c66ac9db 4631 ret = transport_generic_new_cmd(cmd);
f147abb4 4632 if (ret < 0) {
03e98c9e
NB		 4633 transport_generic_request_failure(cmd);
4634 break;
c66ac9db
NB		 4635 }
4636 break;
4637 case TRANSPORT_PROCESS_WRITE:
4638 transport_generic_process_write(cmd);
4639 break;
c66ac9db
NB		 4640 case TRANSPORT_PROCESS_TMR:
4641 transport_generic_do_tmr(cmd);
4642 break;
07bde79a 4643 case TRANSPORT_COMPLETE_QF_WP:
e057f533
CH		 4644 transport_write_pending_qf(cmd);
4645 break;
4646 case TRANSPORT_COMPLETE_QF_OK:
4647 transport_complete_qf(cmd);
07bde79a 4648 break;
c66ac9db 4649 default:
f2da9dbd
CH		 4650 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4651 "i_state: %d on SE LUN: %u\n",
4652 cmd->t_state,
e3d6f909
AG		 4653 cmd->se_tfo->get_task_tag(cmd),
4654 cmd->se_tfo->get_cmd_state(cmd),
4655 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 4656 BUG();
4657 }
4658
4659 goto get_cmd;
4660 }
4661
4662out:
ce8762f6
NB		 4663 WARN_ON(!list_empty(&dev->state_task_list));
4664 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
c66ac9db
NB		 4665 dev->process_thread = NULL;
4666 return 0;
4667}
Linux kernel - Deliverables
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