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target: remove the unused t_task_pt_sgl and t_task_pt_sgl_num se_cmd fields
[linux-2.6-block.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_sess_cache;
65struct kmem_cache *se_tmr_req_cache;
66struct kmem_cache *se_ua_cache;
c66ac9db
NB		 67struct kmem_cache *t10_pr_reg_cache;
68struct kmem_cache *t10_alua_lu_gp_cache;
69struct kmem_cache *t10_alua_lu_gp_mem_cache;
70struct kmem_cache *t10_alua_tg_pt_gp_cache;
71struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
72
c66ac9db 73static int transport_generic_write_pending(struct se_cmd *);
5951146d 74static int transport_processing_thread(void *param);
c66ac9db
NB		 75static int __transport_execute_tasks(struct se_device *dev);
76static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 77static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 78 struct se_device *dev);
c66ac9db 79static void transport_free_dev_tasks(struct se_cmd *cmd);
05d1c7c0 80static int transport_generic_get_mem(struct se_cmd *cmd);
39c05f32 81static void transport_put_cmd(struct se_cmd *cmd);
3df8d40b 82static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
c66ac9db 83static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
03e98c9e 84static void transport_generic_request_failure(struct se_cmd *);
35e0e757 85static void target_complete_ok_work(struct work_struct *work);
c66ac9db 86
e3d6f909 87int init_se_kmem_caches(void)
c66ac9db 88{
c66ac9db
NB		 89 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
90 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
91 0, NULL);
6708bb27
AG		 92 if (!se_tmr_req_cache) {
93 pr_err("kmem_cache_create() for struct se_tmr_req"
c66ac9db 94 " failed\n");
97c34f3b 95 goto out;
c66ac9db
NB		 96 }
97 se_sess_cache = kmem_cache_create("se_sess_cache",
98 sizeof(struct se_session), __alignof__(struct se_session),
99 0, NULL);
6708bb27
AG		 100 if (!se_sess_cache) {
101 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 102 " failed\n");
35e0e757 103 goto out_free_tmr_req_cache;
c66ac9db
NB		 104 }
105 se_ua_cache = kmem_cache_create("se_ua_cache",
106 sizeof(struct se_ua), __alignof__(struct se_ua),
107 0, NULL);
6708bb27
AG		 108 if (!se_ua_cache) {
109 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 110 goto out_free_sess_cache;
c66ac9db 111 }
c66ac9db
NB		 112 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
113 sizeof(struct t10_pr_registration),
114 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 115 if (!t10_pr_reg_cache) {
116 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 117 " failed\n");
35e0e757 118 goto out_free_ua_cache;
c66ac9db
NB		 119 }
120 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
121 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
122 0, NULL);
6708bb27
AG		 123 if (!t10_alua_lu_gp_cache) {
124 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 125 " failed\n");
35e0e757 126 goto out_free_pr_reg_cache;
c66ac9db
NB		 127 }
128 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
129 sizeof(struct t10_alua_lu_gp_member),
130 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 131 if (!t10_alua_lu_gp_mem_cache) {
132 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 133 "cache failed\n");
35e0e757 134 goto out_free_lu_gp_cache;
c66ac9db
NB		 135 }
136 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
137 sizeof(struct t10_alua_tg_pt_gp),
138 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 139 if (!t10_alua_tg_pt_gp_cache) {
140 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 141 "cache failed\n");
35e0e757 142 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 143 }
144 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
145 "t10_alua_tg_pt_gp_mem_cache",
146 sizeof(struct t10_alua_tg_pt_gp_member),
147 __alignof__(struct t10_alua_tg_pt_gp_member),
148 0, NULL);
6708bb27
AG		 149 if (!t10_alua_tg_pt_gp_mem_cache) {
150 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 151 "mem_t failed\n");
35e0e757 152 goto out_free_tg_pt_gp_cache;
c66ac9db
NB		 153 }
154
35e0e757
CH		 155 target_completion_wq = alloc_workqueue("target_completion",
156 WQ_MEM_RECLAIM, 0);
157 if (!target_completion_wq)
158 goto out_free_tg_pt_gp_mem_cache;
159
c66ac9db 160 return 0;
35e0e757
CH		 161
162out_free_tg_pt_gp_mem_cache:
163 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
164out_free_tg_pt_gp_cache:
165 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
166out_free_lu_gp_mem_cache:
167 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
168out_free_lu_gp_cache:
169 kmem_cache_destroy(t10_alua_lu_gp_cache);
170out_free_pr_reg_cache:
171 kmem_cache_destroy(t10_pr_reg_cache);
172out_free_ua_cache:
173 kmem_cache_destroy(se_ua_cache);
174out_free_sess_cache:
175 kmem_cache_destroy(se_sess_cache);
176out_free_tmr_req_cache:
177 kmem_cache_destroy(se_tmr_req_cache);
c66ac9db 178out:
e3d6f909 179 return -ENOMEM;
c66ac9db
NB		 180}
181
e3d6f909 182void release_se_kmem_caches(void)
c66ac9db 183{
35e0e757 184 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 185 kmem_cache_destroy(se_tmr_req_cache);
186 kmem_cache_destroy(se_sess_cache);
187 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 188 kmem_cache_destroy(t10_pr_reg_cache);
189 kmem_cache_destroy(t10_alua_lu_gp_cache);
190 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
191 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
192 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 193}
194
e3d6f909
AG		 195/* This code ensures unique mib indexes are handed out. */
196static DEFINE_SPINLOCK(scsi_mib_index_lock);
197static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 198
199/*
200 * Allocate a new row index for the entry type specified
201 */
202u32 scsi_get_new_index(scsi_index_t type)
203{
204 u32 new_index;
205
e3d6f909 206 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 207
e3d6f909
AG		 208 spin_lock(&scsi_mib_index_lock);
209 new_index = ++scsi_mib_index[type];
210 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 211
212 return new_index;
213}
214
c66ac9db
NB		 215void transport_init_queue_obj(struct se_queue_obj *qobj)
216{
217 atomic_set(&qobj->queue_cnt, 0);
218 INIT_LIST_HEAD(&qobj->qobj_list);
219 init_waitqueue_head(&qobj->thread_wq);
220 spin_lock_init(&qobj->cmd_queue_lock);
221}
222EXPORT_SYMBOL(transport_init_queue_obj);
223
dbc5623e 224void transport_subsystem_check_init(void)
c66ac9db
NB		 225{
226 int ret;
227
dbc5623e
NB		 228 if (sub_api_initialized)
229 return;
230
c66ac9db
NB		 231 ret = request_module("target_core_iblock");
232 if (ret != 0)
6708bb27 233 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 234
235 ret = request_module("target_core_file");
236 if (ret != 0)
6708bb27 237 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 238
239 ret = request_module("target_core_pscsi");
240 if (ret != 0)
6708bb27 241 pr_err("Unable to load target_core_pscsi\n");
c66ac9db
NB		 242
243 ret = request_module("target_core_stgt");
244 if (ret != 0)
6708bb27 245 pr_err("Unable to load target_core_stgt\n");
c66ac9db 246
e3d6f909 247 sub_api_initialized = 1;
dbc5623e 248 return;
c66ac9db
NB		 249}
250
251struct se_session *transport_init_session(void)
252{
253 struct se_session *se_sess;
254
255 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 256 if (!se_sess) {
257 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 258 " se_sess_cache\n");
259 return ERR_PTR(-ENOMEM);
260 }
261 INIT_LIST_HEAD(&se_sess->sess_list);
262 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d
NB		 263 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
264 INIT_LIST_HEAD(&se_sess->sess_wait_list);
265 spin_lock_init(&se_sess->sess_cmd_lock);
c66ac9db
NB		 266
267 return se_sess;
268}
269EXPORT_SYMBOL(transport_init_session);
270
271/*
272 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
273 */
274void __transport_register_session(
275 struct se_portal_group *se_tpg,
276 struct se_node_acl *se_nacl,
277 struct se_session *se_sess,
278 void *fabric_sess_ptr)
279{
280 unsigned char buf[PR_REG_ISID_LEN];
281
282 se_sess->se_tpg = se_tpg;
283 se_sess->fabric_sess_ptr = fabric_sess_ptr;
284 /*
285 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
286 *
287 * Only set for struct se_session's that will actually be moving I/O.
288 * eg: *NOT* discovery sessions.
289 */
290 if (se_nacl) {
291 /*
292 * If the fabric module supports an ISID based TransportID,
293 * save this value in binary from the fabric I_T Nexus now.
294 */
e3d6f909 295 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 296 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 297 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 298 &buf[0], PR_REG_ISID_LEN);
299 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
300 }
301 spin_lock_irq(&se_nacl->nacl_sess_lock);
302 /*
303 * The se_nacl->nacl_sess pointer will be set to the
304 * last active I_T Nexus for each struct se_node_acl.
305 */
306 se_nacl->nacl_sess = se_sess;
307
308 list_add_tail(&se_sess->sess_acl_list,
309 &se_nacl->acl_sess_list);
310 spin_unlock_irq(&se_nacl->nacl_sess_lock);
311 }
312 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
313
6708bb27 314 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 315 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 316}
317EXPORT_SYMBOL(__transport_register_session);
318
319void transport_register_session(
320 struct se_portal_group *se_tpg,
321 struct se_node_acl *se_nacl,
322 struct se_session *se_sess,
323 void *fabric_sess_ptr)
324{
325 spin_lock_bh(&se_tpg->session_lock);
326 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
327 spin_unlock_bh(&se_tpg->session_lock);
328}
329EXPORT_SYMBOL(transport_register_session);
330
331void transport_deregister_session_configfs(struct se_session *se_sess)
332{
333 struct se_node_acl *se_nacl;
23388864 334 unsigned long flags;
c66ac9db
NB		 335 /*
336 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
337 */
338 se_nacl = se_sess->se_node_acl;
6708bb27 339 if (se_nacl) {
23388864 340 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 341 list_del(&se_sess->sess_acl_list);
342 /*
343 * If the session list is empty, then clear the pointer.
344 * Otherwise, set the struct se_session pointer from the tail
345 * element of the per struct se_node_acl active session list.
346 */
347 if (list_empty(&se_nacl->acl_sess_list))
348 se_nacl->nacl_sess = NULL;
349 else {
350 se_nacl->nacl_sess = container_of(
351 se_nacl->acl_sess_list.prev,
352 struct se_session, sess_acl_list);
353 }
23388864 354 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 355 }
356}
357EXPORT_SYMBOL(transport_deregister_session_configfs);
358
359void transport_free_session(struct se_session *se_sess)
360{
361 kmem_cache_free(se_sess_cache, se_sess);
362}
363EXPORT_SYMBOL(transport_free_session);
364
365void transport_deregister_session(struct se_session *se_sess)
366{
367 struct se_portal_group *se_tpg = se_sess->se_tpg;
368 struct se_node_acl *se_nacl;
e63a8e19 369 unsigned long flags;
c66ac9db 370
6708bb27 371 if (!se_tpg) {
c66ac9db
NB		 372 transport_free_session(se_sess);
373 return;
374 }
c66ac9db 375
e63a8e19 376 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 377 list_del(&se_sess->sess_list);
378 se_sess->se_tpg = NULL;
379 se_sess->fabric_sess_ptr = NULL;
e63a8e19 380 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 381
382 /*
383 * Determine if we need to do extra work for this initiator node's
384 * struct se_node_acl if it had been previously dynamically generated.
385 */
386 se_nacl = se_sess->se_node_acl;
6708bb27 387 if (se_nacl) {
e63a8e19 388 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 389 if (se_nacl->dynamic_node_acl) {
6708bb27
AG		 390 if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
391 se_tpg)) {
c66ac9db
NB		 392 list_del(&se_nacl->acl_list);
393 se_tpg->num_node_acls--;
e63a8e19 394 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 395
396 core_tpg_wait_for_nacl_pr_ref(se_nacl);
c66ac9db 397 core_free_device_list_for_node(se_nacl, se_tpg);
e3d6f909 398 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
c66ac9db 399 se_nacl);
e63a8e19 400 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 401 }
402 }
e63a8e19 403 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 404 }
405
406 transport_free_session(se_sess);
407
6708bb27 408 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 409 se_tpg->se_tpg_tfo->get_fabric_name());
c66ac9db
NB		 410}
411EXPORT_SYMBOL(transport_deregister_session);
412
413/*
a1d8b49a 414 * Called with cmd->t_state_lock held.
c66ac9db
NB		 415 */
416static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
417{
42bf829e 418 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 419 struct se_task *task;
420 unsigned long flags;
421
42bf829e
CH		 422 if (!dev)
423 return;
c66ac9db 424
42bf829e 425 list_for_each_entry(task, &cmd->t_task_list, t_list) {
6c76bf95 426 if (task->task_flags & TF_ACTIVE)
c66ac9db
NB		 427 continue;
428
6708bb27 429 if (!atomic_read(&task->task_state_active))
c66ac9db
NB		 430 continue;
431
432 spin_lock_irqsave(&dev->execute_task_lock, flags);
433 list_del(&task->t_state_list);
6708bb27
AG		 434 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
435 cmd->se_tfo->get_task_tag(cmd), dev, task);
c66ac9db
NB		 436 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
437
438 atomic_set(&task->task_state_active, 0);
a1d8b49a 439 atomic_dec(&cmd->t_task_cdbs_ex_left);
c66ac9db
NB		 440 }
441}
442
443/* transport_cmd_check_stop():
444 *
445 * 'transport_off = 1' determines if t_transport_active should be cleared.
446 * 'transport_off = 2' determines if task_dev_state should be removed.
447 *
448 * A non-zero u8 t_state sets cmd->t_state.
449 * Returns 1 when command is stopped, else 0.
450 */
451static int transport_cmd_check_stop(
452 struct se_cmd *cmd,
453 int transport_off,
454 u8 t_state)
455{
456 unsigned long flags;
457
a1d8b49a 458 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 459 /*
460 * Determine if IOCTL context caller in requesting the stopping of this
461 * command for LUN shutdown purposes.
462 */
a1d8b49a 463 if (atomic_read(&cmd->transport_lun_stop)) {
6708bb27 464 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
c66ac9db 465 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 466 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 467
a1d8b49a 468 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 469 if (transport_off == 2)
470 transport_all_task_dev_remove_state(cmd);
a1d8b49a 471 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 472
a1d8b49a 473 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 474 return 1;
475 }
476 /*
477 * Determine if frontend context caller is requesting the stopping of
e3d6f909 478 * this command for frontend exceptions.
c66ac9db 479 */
a1d8b49a 480 if (atomic_read(&cmd->t_transport_stop)) {
6708bb27 481 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
c66ac9db 482 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 483 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 484
c66ac9db
NB		 485 if (transport_off == 2)
486 transport_all_task_dev_remove_state(cmd);
487
488 /*
489 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
490 * to FE.
491 */
492 if (transport_off == 2)
493 cmd->se_lun = NULL;
a1d8b49a 494 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 495
a1d8b49a 496 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 497 return 1;
498 }
499 if (transport_off) {
a1d8b49a 500 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 501 if (transport_off == 2) {
502 transport_all_task_dev_remove_state(cmd);
503 /*
504 * Clear struct se_cmd->se_lun before the transport_off == 2
505 * handoff to fabric module.
506 */
507 cmd->se_lun = NULL;
508 /*
509 * Some fabric modules like tcm_loop can release
25985edc 510 * their internally allocated I/O reference now and
c66ac9db 511 * struct se_cmd now.
88dd9e26
NB		 512 *
513 * Fabric modules are expected to return '1' here if the
514 * se_cmd being passed is released at this point,
515 * or zero if not being released.
c66ac9db 516 */
e3d6f909 517 if (cmd->se_tfo->check_stop_free != NULL) {
c66ac9db 518 spin_unlock_irqrestore(
a1d8b49a 519 &cmd->t_state_lock, flags);
c66ac9db 520
88dd9e26 521 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 522 }
523 }
a1d8b49a 524 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 525
526 return 0;
527 } else if (t_state)
528 cmd->t_state = t_state;
a1d8b49a 529 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 530
531 return 0;
532}
533
534static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
535{
536 return transport_cmd_check_stop(cmd, 2, 0);
537}
538
539static void transport_lun_remove_cmd(struct se_cmd *cmd)
540{
e3d6f909 541 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 542 unsigned long flags;
543
544 if (!lun)
545 return;
546
a1d8b49a 547 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 548 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 549 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 550 goto check_lun;
551 }
a1d8b49a 552 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 553 transport_all_task_dev_remove_state(cmd);
a1d8b49a 554 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 555
c66ac9db
NB		 556
557check_lun:
558 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
a1d8b49a 559 if (atomic_read(&cmd->transport_lun_active)) {
5951146d 560 list_del(&cmd->se_lun_node);
a1d8b49a 561 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db 562#if 0
6708bb27 563 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
e3d6f909 564 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
c66ac9db
NB		 565#endif
566 }
567 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
568}
569
570void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
571{
8dc52b54
NB		 572 if (!cmd->se_tmr_req)
573 transport_lun_remove_cmd(cmd);
c66ac9db
NB		 574
575 if (transport_cmd_check_stop_to_fabric(cmd))
576 return;
77039d1e 577 if (remove) {
3df8d40b 578 transport_remove_cmd_from_queue(cmd);
e6a2573f 579 transport_put_cmd(cmd);
77039d1e 580 }
c66ac9db
NB		 581}
582
f7a5cc0b
CH		 583static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
584 bool at_head)
c66ac9db
NB		 585{
586 struct se_device *dev = cmd->se_dev;
e3d6f909 587 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 588 unsigned long flags;
589
c66ac9db 590 if (t_state) {
a1d8b49a 591 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 592 cmd->t_state = t_state;
a1d8b49a
AG		 593 atomic_set(&cmd->t_transport_active, 1);
594 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 595 }
596
597 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
79a7fef2
RD		 598
599 /* If the cmd is already on the list, remove it before we add it */
600 if (!list_empty(&cmd->se_queue_node))
601 list_del(&cmd->se_queue_node);
602 else
603 atomic_inc(&qobj->queue_cnt);
604
f7a5cc0b 605 if (at_head)
07bde79a 606 list_add(&cmd->se_queue_node, &qobj->qobj_list);
f7a5cc0b 607 else
07bde79a 608 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
79a7fef2 609 atomic_set(&cmd->t_transport_queue_active, 1);
c66ac9db
NB		 610 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
611
c66ac9db 612 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 613}
614
5951146d
AG		 615static struct se_cmd *
616transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 617{
5951146d 618 struct se_cmd *cmd;
c66ac9db
NB		 619 unsigned long flags;
620
621 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
622 if (list_empty(&qobj->qobj_list)) {
623 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
624 return NULL;
625 }
5951146d 626 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 627
79a7fef2 628 atomic_set(&cmd->t_transport_queue_active, 0);
c66ac9db 629
79a7fef2 630 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 631 atomic_dec(&qobj->queue_cnt);
632 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
633
5951146d 634 return cmd;
c66ac9db
NB		 635}
636
3df8d40b 637static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
c66ac9db 638{
3df8d40b 639 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
c66ac9db
NB		 640 unsigned long flags;
641
642 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
6708bb27 643 if (!atomic_read(&cmd->t_transport_queue_active)) {
c66ac9db
NB		 644 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
645 return;
646 }
79a7fef2
RD		 647 atomic_set(&cmd->t_transport_queue_active, 0);
648 atomic_dec(&qobj->queue_cnt);
649 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 650 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
651
a1d8b49a 652 if (atomic_read(&cmd->t_transport_queue_active)) {
6708bb27 653 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
e3d6f909 654 cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 655 atomic_read(&cmd->t_transport_queue_active));
c66ac9db
NB		 656 }
657}
658
659/*
660 * Completion function used by TCM subsystem plugins (such as FILEIO)
661 * for queueing up response from struct se_subsystem_api->do_task()
662 */
663void transport_complete_sync_cache(struct se_cmd *cmd, int good)
664{
a1d8b49a 665 struct se_task *task = list_entry(cmd->t_task_list.next,
c66ac9db
NB		 666 struct se_task, t_list);
667
668 if (good) {
669 cmd->scsi_status = SAM_STAT_GOOD;
670 task->task_scsi_status = GOOD;
671 } else {
672 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
03e98c9e
NB		 673 task->task_se_cmd->scsi_sense_reason =
674 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
675
c66ac9db
NB		 676 }
677
678 transport_complete_task(task, good);
679}
680EXPORT_SYMBOL(transport_complete_sync_cache);
681
35e0e757
CH		 682static void target_complete_failure_work(struct work_struct *work)
683{
684 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
685
03e98c9e 686 transport_generic_request_failure(cmd);
35e0e757
CH		 687}
688
c66ac9db
NB		 689/* transport_complete_task():
690 *
691 * Called from interrupt and non interrupt context depending
692 * on the transport plugin.
693 */
694void transport_complete_task(struct se_task *task, int success)
695{
e3d6f909 696 struct se_cmd *cmd = task->task_se_cmd;
42bf829e 697 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 698 unsigned long flags;
699#if 0
6708bb27 700 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
a1d8b49a 701 cmd->t_task_cdb[0], dev);
c66ac9db 702#endif
e3d6f909 703 if (dev)
c66ac9db 704 atomic_inc(&dev->depth_left);
c66ac9db 705
a1d8b49a 706 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 707 task->task_flags &= ~TF_ACTIVE;
c66ac9db
NB		 708
709 /*
710 * See if any sense data exists, if so set the TASK_SENSE flag.
711 * Also check for any other post completion work that needs to be
712 * done by the plugins.
713 */
714 if (dev && dev->transport->transport_complete) {
715 if (dev->transport->transport_complete(task) != 0) {
716 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
717 task->task_sense = 1;
718 success = 1;
719 }
720 }
721
722 /*
723 * See if we are waiting for outstanding struct se_task
724 * to complete for an exception condition
725 */
6c76bf95 726 if (task->task_flags & TF_REQUEST_STOP) {
a1d8b49a 727 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 728 complete(&task->task_stop_comp);
729 return;
730 }
2235007c
CH		 731
732 if (!success)
733 cmd->t_tasks_failed = 1;
734
c66ac9db
NB		 735 /*
736 * Decrement the outstanding t_task_cdbs_left count. The last
737 * struct se_task from struct se_cmd will complete itself into the
738 * device queue depending upon int success.
739 */
6708bb27 740 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
a1d8b49a 741 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 742 return;
743 }
744
2235007c 745 if (cmd->t_tasks_failed) {
c66ac9db
NB		 746 if (!task->task_error_status) {
747 task->task_error_status =
03e98c9e
NB		 748 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
749 cmd->scsi_sense_reason =
750 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 751 }
03e98c9e 752
35e0e757 753 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 754 } else {
a1d8b49a 755 atomic_set(&cmd->t_transport_complete, 1);
35e0e757 756 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 757 }
35e0e757 758
35e0e757
CH		 759 cmd->t_state = TRANSPORT_COMPLETE;
760 atomic_set(&cmd->t_transport_active, 1);
a1d8b49a 761 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 762
35e0e757 763 queue_work(target_completion_wq, &cmd->work);
c66ac9db
NB		 764}
765EXPORT_SYMBOL(transport_complete_task);
766
767/*
768 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
769 * struct se_task list are ready to be added to the active execution list
770 * struct se_device
771
772 * Called with se_dev_t->execute_task_lock called.
773 */
774static inline int transport_add_task_check_sam_attr(
775 struct se_task *task,
776 struct se_task *task_prev,
777 struct se_device *dev)
778{
779 /*
780 * No SAM Task attribute emulation enabled, add to tail of
781 * execution queue
782 */
783 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
784 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
785 return 0;
786 }
787 /*
788 * HEAD_OF_QUEUE attribute for received CDB, which means
789 * the first task that is associated with a struct se_cmd goes to
790 * head of the struct se_device->execute_task_list, and task_prev
791 * after that for each subsequent task
792 */
e66ecd50 793 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 794 list_add(&task->t_execute_list,
795 (task_prev != NULL) ?
796 &task_prev->t_execute_list :
797 &dev->execute_task_list);
798
6708bb27 799 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
c66ac9db 800 " in execution queue\n",
6708bb27 801 task->task_se_cmd->t_task_cdb[0]);
c66ac9db
NB		 802 return 1;
803 }
804 /*
805 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
806 * transitioned from Dermant -> Active state, and are added to the end
807 * of the struct se_device->execute_task_list
808 */
809 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
810 return 0;
811}
812
813/* __transport_add_task_to_execute_queue():
814 *
815 * Called with se_dev_t->execute_task_lock called.
816 */
817static void __transport_add_task_to_execute_queue(
818 struct se_task *task,
819 struct se_task *task_prev,
820 struct se_device *dev)
821{
822 int head_of_queue;
823
824 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
825 atomic_inc(&dev->execute_tasks);
826
827 if (atomic_read(&task->task_state_active))
828 return;
829 /*
830 * Determine if this task needs to go to HEAD_OF_QUEUE for the
831 * state list as well. Running with SAM Task Attribute emulation
832 * will always return head_of_queue == 0 here
833 */
834 if (head_of_queue)
835 list_add(&task->t_state_list, (task_prev) ?
836 &task_prev->t_state_list :
837 &dev->state_task_list);
838 else
839 list_add_tail(&task->t_state_list, &dev->state_task_list);
840
841 atomic_set(&task->task_state_active, 1);
842
6708bb27 843 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
e3d6f909 844 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
c66ac9db
NB		 845 task, dev);
846}
847
848static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
849{
42bf829e 850 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 851 struct se_task *task;
852 unsigned long flags;
853
a1d8b49a
AG		 854 spin_lock_irqsave(&cmd->t_state_lock, flags);
855 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 856 if (atomic_read(&task->task_state_active))
857 continue;
858
859 spin_lock(&dev->execute_task_lock);
860 list_add_tail(&task->t_state_list, &dev->state_task_list);
861 atomic_set(&task->task_state_active, 1);
862
6708bb27
AG		 863 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
864 task->task_se_cmd->se_tfo->get_task_tag(
c66ac9db
NB		 865 task->task_se_cmd), task, dev);
866
867 spin_unlock(&dev->execute_task_lock);
868 }
a1d8b49a 869 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 870}
871
872static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
873{
5951146d 874 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 875 struct se_task *task, *task_prev = NULL;
876 unsigned long flags;
877
878 spin_lock_irqsave(&dev->execute_task_lock, flags);
a1d8b49a 879 list_for_each_entry(task, &cmd->t_task_list, t_list) {
04629b7b 880 if (!list_empty(&task->t_execute_list))
c66ac9db
NB		 881 continue;
882 /*
883 * __transport_add_task_to_execute_queue() handles the
884 * SAM Task Attribute emulation if enabled
885 */
886 __transport_add_task_to_execute_queue(task, task_prev, dev);
c66ac9db
NB		 887 task_prev = task;
888 }
889 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 890}
891
04629b7b
CH		 892void __transport_remove_task_from_execute_queue(struct se_task *task,
893 struct se_device *dev)
894{
895 list_del_init(&task->t_execute_list);
896 atomic_dec(&dev->execute_tasks);
897}
898
52208ae3 899void transport_remove_task_from_execute_queue(
c66ac9db
NB		 900 struct se_task *task,
901 struct se_device *dev)
902{
903 unsigned long flags;
904
04629b7b 905 if (WARN_ON(list_empty(&task->t_execute_list)))
af57c3ac 906 return;
af57c3ac 907
c66ac9db 908 spin_lock_irqsave(&dev->execute_task_lock, flags);
04629b7b 909 __transport_remove_task_from_execute_queue(task, dev);
c66ac9db
NB		 910 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
911}
912
07bde79a 913/*
f147abb4 914 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a
NB		 915 */
916
917static void target_qf_do_work(struct work_struct *work)
918{
919 struct se_device *dev = container_of(work, struct se_device,
920 qf_work_queue);
bcac364a 921 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 922 struct se_cmd *cmd, *cmd_tmp;
923
924 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 925 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
926 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 927
bcac364a 928 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 929 list_del(&cmd->se_qf_node);
930 atomic_dec(&dev->dev_qf_count);
931 smp_mb__after_atomic_dec();
07bde79a 932
6708bb27 933 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 934 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 935 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 936 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
937 : "UNKNOWN");
f7a5cc0b
CH		 938
939 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
07bde79a 940 }
07bde79a
NB		 941}
942
c66ac9db
NB		 943unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
944{
945 switch (cmd->data_direction) {
946 case DMA_NONE:
947 return "NONE";
948 case DMA_FROM_DEVICE:
949 return "READ";
950 case DMA_TO_DEVICE:
951 return "WRITE";
952 case DMA_BIDIRECTIONAL:
953 return "BIDI";
954 default:
955 break;
956 }
957
958 return "UNKNOWN";
959}
960
961void transport_dump_dev_state(
962 struct se_device *dev,
963 char *b,
964 int *bl)
965{
966 *bl += sprintf(b + *bl, "Status: ");
967 switch (dev->dev_status) {
968 case TRANSPORT_DEVICE_ACTIVATED:
969 *bl += sprintf(b + *bl, "ACTIVATED");
970 break;
971 case TRANSPORT_DEVICE_DEACTIVATED:
972 *bl += sprintf(b + *bl, "DEACTIVATED");
973 break;
974 case TRANSPORT_DEVICE_SHUTDOWN:
975 *bl += sprintf(b + *bl, "SHUTDOWN");
976 break;
977 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
978 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
979 *bl += sprintf(b + *bl, "OFFLINE");
980 break;
981 default:
982 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
983 break;
984 }
985
986 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
987 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
988 dev->queue_depth);
989 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
e3d6f909 990 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db
NB		 991 *bl += sprintf(b + *bl, " ");
992}
993
c66ac9db
NB		 994void transport_dump_vpd_proto_id(
995 struct t10_vpd *vpd,
996 unsigned char *p_buf,
997 int p_buf_len)
998{
999 unsigned char buf[VPD_TMP_BUF_SIZE];
1000 int len;
1001
1002 memset(buf, 0, VPD_TMP_BUF_SIZE);
1003 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1004
1005 switch (vpd->protocol_identifier) {
1006 case 0x00:
1007 sprintf(buf+len, "Fibre Channel\n");
1008 break;
1009 case 0x10:
1010 sprintf(buf+len, "Parallel SCSI\n");
1011 break;
1012 case 0x20:
1013 sprintf(buf+len, "SSA\n");
1014 break;
1015 case 0x30:
1016 sprintf(buf+len, "IEEE 1394\n");
1017 break;
1018 case 0x40:
1019 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1020 " Protocol\n");
1021 break;
1022 case 0x50:
1023 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1024 break;
1025 case 0x60:
1026 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1027 break;
1028 case 0x70:
1029 sprintf(buf+len, "Automation/Drive Interface Transport"
1030 " Protocol\n");
1031 break;
1032 case 0x80:
1033 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1034 break;
1035 default:
1036 sprintf(buf+len, "Unknown 0x%02x\n",
1037 vpd->protocol_identifier);
1038 break;
1039 }
1040
1041 if (p_buf)
1042 strncpy(p_buf, buf, p_buf_len);
1043 else
6708bb27 1044 pr_debug("%s", buf);
c66ac9db
NB		 1045}
1046
1047void
1048transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1049{
1050 /*
1051 * Check if the Protocol Identifier Valid (PIV) bit is set..
1052 *
1053 * from spc3r23.pdf section 7.5.1
1054 */
1055 if (page_83[1] & 0x80) {
1056 vpd->protocol_identifier = (page_83[0] & 0xf0);
1057 vpd->protocol_identifier_set = 1;
1058 transport_dump_vpd_proto_id(vpd, NULL, 0);
1059 }
1060}
1061EXPORT_SYMBOL(transport_set_vpd_proto_id);
1062
1063int transport_dump_vpd_assoc(
1064 struct t10_vpd *vpd,
1065 unsigned char *p_buf,
1066 int p_buf_len)
1067{
1068 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1069 int ret = 0;
1070 int len;
c66ac9db
NB		 1071
1072 memset(buf, 0, VPD_TMP_BUF_SIZE);
1073 len = sprintf(buf, "T10 VPD Identifier Association: ");
1074
1075 switch (vpd->association) {
1076 case 0x00:
1077 sprintf(buf+len, "addressed logical unit\n");
1078 break;
1079 case 0x10:
1080 sprintf(buf+len, "target port\n");
1081 break;
1082 case 0x20:
1083 sprintf(buf+len, "SCSI target device\n");
1084 break;
1085 default:
1086 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 1087 ret = -EINVAL;
c66ac9db
NB		 1088 break;
1089 }
1090
1091 if (p_buf)
1092 strncpy(p_buf, buf, p_buf_len);
1093 else
6708bb27 1094 pr_debug("%s", buf);
c66ac9db
NB		 1095
1096 return ret;
1097}
1098
1099int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1100{
1101 /*
1102 * The VPD identification association..
1103 *
1104 * from spc3r23.pdf Section 7.6.3.1 Table 297
1105 */
1106 vpd->association = (page_83[1] & 0x30);
1107 return transport_dump_vpd_assoc(vpd, NULL, 0);
1108}
1109EXPORT_SYMBOL(transport_set_vpd_assoc);
1110
1111int transport_dump_vpd_ident_type(
1112 struct t10_vpd *vpd,
1113 unsigned char *p_buf,
1114 int p_buf_len)
1115{
1116 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1117 int ret = 0;
1118 int len;
c66ac9db
NB		 1119
1120 memset(buf, 0, VPD_TMP_BUF_SIZE);
1121 len = sprintf(buf, "T10 VPD Identifier Type: ");
1122
1123 switch (vpd->device_identifier_type) {
1124 case 0x00:
1125 sprintf(buf+len, "Vendor specific\n");
1126 break;
1127 case 0x01:
1128 sprintf(buf+len, "T10 Vendor ID based\n");
1129 break;
1130 case 0x02:
1131 sprintf(buf+len, "EUI-64 based\n");
1132 break;
1133 case 0x03:
1134 sprintf(buf+len, "NAA\n");
1135 break;
1136 case 0x04:
1137 sprintf(buf+len, "Relative target port identifier\n");
1138 break;
1139 case 0x08:
1140 sprintf(buf+len, "SCSI name string\n");
1141 break;
1142 default:
1143 sprintf(buf+len, "Unsupported: 0x%02x\n",
1144 vpd->device_identifier_type);
e3d6f909 1145 ret = -EINVAL;
c66ac9db
NB		 1146 break;
1147 }
1148
e3d6f909
AG		 1149 if (p_buf) {
1150 if (p_buf_len < strlen(buf)+1)
1151 return -EINVAL;
c66ac9db 1152 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1153 } else {
6708bb27 1154 pr_debug("%s", buf);
e3d6f909 1155 }
c66ac9db
NB		 1156
1157 return ret;
1158}
1159
1160int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1161{
1162 /*
1163 * The VPD identifier type..
1164 *
1165 * from spc3r23.pdf Section 7.6.3.1 Table 298
1166 */
1167 vpd->device_identifier_type = (page_83[1] & 0x0f);
1168 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1169}
1170EXPORT_SYMBOL(transport_set_vpd_ident_type);
1171
1172int transport_dump_vpd_ident(
1173 struct t10_vpd *vpd,
1174 unsigned char *p_buf,
1175 int p_buf_len)
1176{
1177 unsigned char buf[VPD_TMP_BUF_SIZE];
1178 int ret = 0;
1179
1180 memset(buf, 0, VPD_TMP_BUF_SIZE);
1181
1182 switch (vpd->device_identifier_code_set) {
1183 case 0x01: /* Binary */
1184 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1185 &vpd->device_identifier[0]);
1186 break;
1187 case 0x02: /* ASCII */
1188 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1189 &vpd->device_identifier[0]);
1190 break;
1191 case 0x03: /* UTF-8 */
1192 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1193 &vpd->device_identifier[0]);
1194 break;
1195 default:
1196 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1197 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1198 ret = -EINVAL;
c66ac9db
NB		 1199 break;
1200 }
1201
1202 if (p_buf)
1203 strncpy(p_buf, buf, p_buf_len);
1204 else
6708bb27 1205 pr_debug("%s", buf);
c66ac9db
NB		 1206
1207 return ret;
1208}
1209
1210int
1211transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1212{
1213 static const char hex_str[] = "0123456789abcdef";
1214 int j = 0, i = 4; /* offset to start of the identifer */
1215
1216 /*
1217 * The VPD Code Set (encoding)
1218 *
1219 * from spc3r23.pdf Section 7.6.3.1 Table 296
1220 */
1221 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1222 switch (vpd->device_identifier_code_set) {
1223 case 0x01: /* Binary */
1224 vpd->device_identifier[j++] =
1225 hex_str[vpd->device_identifier_type];
1226 while (i < (4 + page_83[3])) {
1227 vpd->device_identifier[j++] =
1228 hex_str[(page_83[i] & 0xf0) >> 4];
1229 vpd->device_identifier[j++] =
1230 hex_str[page_83[i] & 0x0f];
1231 i++;
1232 }
1233 break;
1234 case 0x02: /* ASCII */
1235 case 0x03: /* UTF-8 */
1236 while (i < (4 + page_83[3]))
1237 vpd->device_identifier[j++] = page_83[i++];
1238 break;
1239 default:
1240 break;
1241 }
1242
1243 return transport_dump_vpd_ident(vpd, NULL, 0);
1244}
1245EXPORT_SYMBOL(transport_set_vpd_ident);
1246
1247static void core_setup_task_attr_emulation(struct se_device *dev)
1248{
1249 /*
1250 * If this device is from Target_Core_Mod/pSCSI, disable the
1251 * SAM Task Attribute emulation.
1252 *
1253 * This is currently not available in upsream Linux/SCSI Target
1254 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1255 */
e3d6f909 1256 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1257 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1258 return;
1259 }
1260
1261 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1262 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1263 " device\n", dev->transport->name,
1264 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1265}
1266
1267static void scsi_dump_inquiry(struct se_device *dev)
1268{
e3d6f909 1269 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
c66ac9db
NB		 1270 int i, device_type;
1271 /*
1272 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1273 */
6708bb27 1274 pr_debug(" Vendor: ");
c66ac9db
NB		 1275 for (i = 0; i < 8; i++)
1276 if (wwn->vendor[i] >= 0x20)
6708bb27 1277 pr_debug("%c", wwn->vendor[i]);
c66ac9db 1278 else
6708bb27 1279 pr_debug(" ");
c66ac9db 1280
6708bb27 1281 pr_debug(" Model: ");
c66ac9db
NB		 1282 for (i = 0; i < 16; i++)
1283 if (wwn->model[i] >= 0x20)
6708bb27 1284 pr_debug("%c", wwn->model[i]);
c66ac9db 1285 else
6708bb27 1286 pr_debug(" ");
c66ac9db 1287
6708bb27 1288 pr_debug(" Revision: ");
c66ac9db
NB		 1289 for (i = 0; i < 4; i++)
1290 if (wwn->revision[i] >= 0x20)
6708bb27 1291 pr_debug("%c", wwn->revision[i]);
c66ac9db 1292 else
6708bb27 1293 pr_debug(" ");
c66ac9db 1294
6708bb27 1295 pr_debug("\n");
c66ac9db 1296
e3d6f909 1297 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1298 pr_debug(" Type: %s ", scsi_device_type(device_type));
1299 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1300 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1301}
1302
1303struct se_device *transport_add_device_to_core_hba(
1304 struct se_hba *hba,
1305 struct se_subsystem_api *transport,
1306 struct se_subsystem_dev *se_dev,
1307 u32 device_flags,
1308 void *transport_dev,
1309 struct se_dev_limits *dev_limits,
1310 const char *inquiry_prod,
1311 const char *inquiry_rev)
1312{
12a18bdc 1313 int force_pt;
c66ac9db
NB		 1314 struct se_device *dev;
1315
1316 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1317 if (!dev) {
1318 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1319 return NULL;
1320 }
c66ac9db 1321
e3d6f909 1322 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1323 dev->dev_flags = device_flags;
1324 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1325 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1326 dev->se_hba = hba;
1327 dev->se_sub_dev = se_dev;
1328 dev->transport = transport;
1329 atomic_set(&dev->active_cmds, 0);
1330 INIT_LIST_HEAD(&dev->dev_list);
1331 INIT_LIST_HEAD(&dev->dev_sep_list);
1332 INIT_LIST_HEAD(&dev->dev_tmr_list);
1333 INIT_LIST_HEAD(&dev->execute_task_list);
1334 INIT_LIST_HEAD(&dev->delayed_cmd_list);
c66ac9db 1335 INIT_LIST_HEAD(&dev->state_task_list);
07bde79a 1336 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1337 spin_lock_init(&dev->execute_task_lock);
1338 spin_lock_init(&dev->delayed_cmd_lock);
c66ac9db
NB		 1339 spin_lock_init(&dev->state_task_lock);
1340 spin_lock_init(&dev->dev_alua_lock);
1341 spin_lock_init(&dev->dev_reservation_lock);
1342 spin_lock_init(&dev->dev_status_lock);
1343 spin_lock_init(&dev->dev_status_thr_lock);
1344 spin_lock_init(&dev->se_port_lock);
1345 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1346 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1347
1348 dev->queue_depth = dev_limits->queue_depth;
1349 atomic_set(&dev->depth_left, dev->queue_depth);
1350 atomic_set(&dev->dev_ordered_id, 0);
1351
1352 se_dev_set_default_attribs(dev, dev_limits);
1353
1354 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1355 dev->creation_time = get_jiffies_64();
1356 spin_lock_init(&dev->stats_lock);
1357
1358 spin_lock(&hba->device_lock);
1359 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1360 hba->dev_count++;
1361 spin_unlock(&hba->device_lock);
1362 /*
1363 * Setup the SAM Task Attribute emulation for struct se_device
1364 */
1365 core_setup_task_attr_emulation(dev);
1366 /*
1367 * Force PR and ALUA passthrough emulation with internal object use.
1368 */
1369 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1370 /*
1371 * Setup the Reservations infrastructure for struct se_device
1372 */
1373 core_setup_reservations(dev, force_pt);
1374 /*
1375 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1376 */
1377 if (core_setup_alua(dev, force_pt) < 0)
1378 goto out;
1379
1380 /*
1381 * Startup the struct se_device processing thread
1382 */
1383 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1384 "LIO_%s", dev->transport->name);
c66ac9db 1385 if (IS_ERR(dev->process_thread)) {
6708bb27 1386 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1387 dev->transport->name);
c66ac9db
NB		 1388 goto out;
1389 }
07bde79a
NB		 1390 /*
1391 * Setup work_queue for QUEUE_FULL
1392 */
1393 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1394 /*
1395 * Preload the initial INQUIRY const values if we are doing
1396 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1397 * passthrough because this is being provided by the backend LLD.
1398 * This is required so that transport_get_inquiry() copies these
1399 * originals once back into DEV_T10_WWN(dev) for the virtual device
1400 * setup.
1401 */
e3d6f909 1402 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1403 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1404 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1405 " INQUIRY consts\n");
1406 goto out;
1407 }
1408
e3d6f909
AG		 1409 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1410 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1411 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1412 }
1413 scsi_dump_inquiry(dev);
1414
12a18bdc 1415 return dev;
c66ac9db 1416out:
c66ac9db
NB		 1417 kthread_stop(dev->process_thread);
1418
1419 spin_lock(&hba->device_lock);
1420 list_del(&dev->dev_list);
1421 hba->dev_count--;
1422 spin_unlock(&hba->device_lock);
1423
1424 se_release_vpd_for_dev(dev);
1425
c66ac9db
NB		 1426 kfree(dev);
1427
1428 return NULL;
1429}
1430EXPORT_SYMBOL(transport_add_device_to_core_hba);
1431
1432/* transport_generic_prepare_cdb():
1433 *
1434 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1435 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1436 * The point of this is since we are mapping iSCSI LUNs to
1437 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1438 * devices and HBAs for a loop.
1439 */
1440static inline void transport_generic_prepare_cdb(
1441 unsigned char *cdb)
1442{
1443 switch (cdb[0]) {
1444 case READ_10: /* SBC - RDProtect */
1445 case READ_12: /* SBC - RDProtect */
1446 case READ_16: /* SBC - RDProtect */
1447 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1448 case VERIFY: /* SBC - VRProtect */
1449 case VERIFY_16: /* SBC - VRProtect */
1450 case WRITE_VERIFY: /* SBC - VRProtect */
1451 case WRITE_VERIFY_12: /* SBC - VRProtect */
1452 break;
1453 default:
1454 cdb[1] &= 0x1f; /* clear logical unit number */
1455 break;
1456 }
1457}
1458
1459static struct se_task *
1460transport_generic_get_task(struct se_cmd *cmd,
1461 enum dma_data_direction data_direction)
1462{
1463 struct se_task *task;
5951146d 1464 struct se_device *dev = cmd->se_dev;
c66ac9db 1465
6708bb27 1466 task = dev->transport->alloc_task(cmd->t_task_cdb);
c66ac9db 1467 if (!task) {
6708bb27 1468 pr_err("Unable to allocate struct se_task\n");
c66ac9db
NB		 1469 return NULL;
1470 }
1471
1472 INIT_LIST_HEAD(&task->t_list);
1473 INIT_LIST_HEAD(&task->t_execute_list);
1474 INIT_LIST_HEAD(&task->t_state_list);
1475 init_completion(&task->task_stop_comp);
c66ac9db 1476 task->task_se_cmd = cmd;
c66ac9db
NB		 1477 task->task_data_direction = data_direction;
1478
c66ac9db
NB		 1479 return task;
1480}
1481
1482static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1483
c66ac9db
NB		 1484/*
1485 * Used by fabric modules containing a local struct se_cmd within their
1486 * fabric dependent per I/O descriptor.
1487 */
1488void transport_init_se_cmd(
1489 struct se_cmd *cmd,
1490 struct target_core_fabric_ops *tfo,
1491 struct se_session *se_sess,
1492 u32 data_length,
1493 int data_direction,
1494 int task_attr,
1495 unsigned char *sense_buffer)
1496{
5951146d
AG		 1497 INIT_LIST_HEAD(&cmd->se_lun_node);
1498 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1499 INIT_LIST_HEAD(&cmd->se_qf_node);
79a7fef2 1500 INIT_LIST_HEAD(&cmd->se_queue_node);
a17f091d 1501 INIT_LIST_HEAD(&cmd->se_cmd_list);
a1d8b49a
AG		 1502 INIT_LIST_HEAD(&cmd->t_task_list);
1503 init_completion(&cmd->transport_lun_fe_stop_comp);
1504 init_completion(&cmd->transport_lun_stop_comp);
1505 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1506 init_completion(&cmd->cmd_wait_comp);
a1d8b49a
AG		 1507 spin_lock_init(&cmd->t_state_lock);
1508 atomic_set(&cmd->transport_dev_active, 1);
c66ac9db
NB		 1509
1510 cmd->se_tfo = tfo;
1511 cmd->se_sess = se_sess;
1512 cmd->data_length = data_length;
1513 cmd->data_direction = data_direction;
1514 cmd->sam_task_attr = task_attr;
1515 cmd->sense_buffer = sense_buffer;
1516}
1517EXPORT_SYMBOL(transport_init_se_cmd);
1518
1519static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1520{
1521 /*
1522 * Check if SAM Task Attribute emulation is enabled for this
1523 * struct se_device storage object
1524 */
5951146d 1525 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1526 return 0;
1527
e66ecd50 1528 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1529 pr_debug("SAM Task Attribute ACA"
c66ac9db 1530 " emulation is not supported\n");
e3d6f909 1531 return -EINVAL;
c66ac9db
NB		 1532 }
1533 /*
1534 * Used to determine when ORDERED commands should go from
1535 * Dormant to Active status.
1536 */
5951146d 1537 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1538 smp_mb__after_atomic_inc();
6708bb27 1539 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1540 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1541 cmd->se_dev->transport->name);
c66ac9db
NB		 1542 return 0;
1543}
1544
c66ac9db
NB		 1545/* transport_generic_allocate_tasks():
1546 *
1547 * Called from fabric RX Thread.
1548 */
1549int transport_generic_allocate_tasks(
1550 struct se_cmd *cmd,
1551 unsigned char *cdb)
1552{
1553 int ret;
1554
1555 transport_generic_prepare_cdb(cdb);
c66ac9db
NB		 1556 /*
1557 * Ensure that the received CDB is less than the max (252 + 8) bytes
1558 * for VARIABLE_LENGTH_CMD
1559 */
1560 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1561 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1562 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1563 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
03e98c9e
NB		 1564 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1565 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
e3d6f909 1566 return -EINVAL;
c66ac9db
NB		 1567 }
1568 /*
1569 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1570 * allocate the additional extended CDB buffer now.. Otherwise
1571 * setup the pointer from __t_task_cdb to t_task_cdb.
1572 */
a1d8b49a
AG		 1573 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1574 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1575 GFP_KERNEL);
6708bb27
AG		 1576 if (!cmd->t_task_cdb) {
1577 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1578 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1579 scsi_command_size(cdb),
a1d8b49a 1580 (unsigned long)sizeof(cmd->__t_task_cdb));
03e98c9e
NB		 1581 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1582 cmd->scsi_sense_reason =
1583 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
e3d6f909 1584 return -ENOMEM;
c66ac9db
NB		 1585 }
1586 } else
a1d8b49a 1587 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1588 /*
a1d8b49a 1589 * Copy the original CDB into cmd->
c66ac9db 1590 */
a1d8b49a 1591 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1592 /*
1593 * Setup the received CDB based on SCSI defined opcodes and
1594 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1595 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1596 * pointer is expected to be setup before we reach this point.
1597 */
1598 ret = transport_generic_cmd_sequencer(cmd, cdb);
1599 if (ret < 0)
1600 return ret;
1601 /*
1602 * Check for SAM Task Attribute Emulation
1603 */
1604 if (transport_check_alloc_task_attr(cmd) < 0) {
1605 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1606 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1607 return -EINVAL;
c66ac9db
NB		 1608 }
1609 spin_lock(&cmd->se_lun->lun_sep_lock);
1610 if (cmd->se_lun->lun_sep)
1611 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1612 spin_unlock(&cmd->se_lun->lun_sep_lock);
1613 return 0;
1614}
1615EXPORT_SYMBOL(transport_generic_allocate_tasks);
1616
695434e1
NB		 1617/*
1618 * Used by fabric module frontends to queue tasks directly.
1619 * Many only be used from process context only
1620 */
1621int transport_handle_cdb_direct(
1622 struct se_cmd *cmd)
1623{
dd8ae59d
NB		 1624 int ret;
1625
695434e1
NB		 1626 if (!cmd->se_lun) {
1627 dump_stack();
6708bb27 1628 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1629 return -EINVAL;
1630 }
1631 if (in_interrupt()) {
1632 dump_stack();
6708bb27 1633 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1634 " from interrupt context\n");
1635 return -EINVAL;
1636 }
dd8ae59d
NB		 1637 /*
1638 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1639 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1640 * in existing usage to ensure that outstanding descriptors are handled
d14921d6 1641 * correctly during shutdown via transport_wait_for_tasks()
dd8ae59d
NB		 1642 *
1643 * Also, we don't take cmd->t_state_lock here as we only expect
1644 * this to be called for initial descriptor submission.
1645 */
1646 cmd->t_state = TRANSPORT_NEW_CMD;
1647 atomic_set(&cmd->t_transport_active, 1);
1648 /*
1649 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1650 * so follow TRANSPORT_NEW_CMD processing thread context usage
1651 * and call transport_generic_request_failure() if necessary..
1652 */
1653 ret = transport_generic_new_cmd(cmd);
03e98c9e
NB		 1654 if (ret < 0)
1655 transport_generic_request_failure(cmd);
1656
dd8ae59d 1657 return 0;
695434e1
NB		 1658}
1659EXPORT_SYMBOL(transport_handle_cdb_direct);
1660
c66ac9db
NB		 1661/*
1662 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1663 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1664 * complete setup in TCM process context w/ TFO->new_cmd_map().
1665 */
1666int transport_generic_handle_cdb_map(
1667 struct se_cmd *cmd)
1668{
e3d6f909 1669 if (!cmd->se_lun) {
c66ac9db 1670 dump_stack();
6708bb27 1671 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1672 return -EINVAL;
c66ac9db
NB		 1673 }
1674
f7a5cc0b 1675 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
c66ac9db
NB		 1676 return 0;
1677}
1678EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1679
1680/* transport_generic_handle_data():
1681 *
1682 *
1683 */
1684int transport_generic_handle_data(
1685 struct se_cmd *cmd)
1686{
1687 /*
1688 * For the software fabric case, then we assume the nexus is being
1689 * failed/shutdown when signals are pending from the kthread context
1690 * caller, so we return a failure. For the HW target mode case running
1691 * in interrupt code, the signal_pending() check is skipped.
1692 */
1693 if (!in_interrupt() && signal_pending(current))
e3d6f909 1694 return -EPERM;
c66ac9db
NB		 1695 /*
1696 * If the received CDB has aleady been ABORTED by the generic
1697 * target engine, we now call transport_check_aborted_status()
1698 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1699 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1700 * sequences at this point.
1701 */
1702 if (transport_check_aborted_status(cmd, 1) != 0)
1703 return 0;
1704
f7a5cc0b 1705 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
c66ac9db
NB		 1706 return 0;
1707}
1708EXPORT_SYMBOL(transport_generic_handle_data);
1709
1710/* transport_generic_handle_tmr():
1711 *
1712 *
1713 */
1714int transport_generic_handle_tmr(
1715 struct se_cmd *cmd)
1716{
f7a5cc0b 1717 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
c66ac9db
NB		 1718 return 0;
1719}
1720EXPORT_SYMBOL(transport_generic_handle_tmr);
1721
cdbb70bb
CH		 1722/*
1723 * If the task is active, request it to be stopped and sleep until it
1724 * has completed.
1725 */
1726bool target_stop_task(struct se_task *task, unsigned long *flags)
1727{
1728 struct se_cmd *cmd = task->task_se_cmd;
1729 bool was_active = false;
1730
1731 if (task->task_flags & TF_ACTIVE) {
1732 task->task_flags |= TF_REQUEST_STOP;
1733 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1734
1735 pr_debug("Task %p waiting to complete\n", task);
1736 wait_for_completion(&task->task_stop_comp);
1737 pr_debug("Task %p stopped successfully\n", task);
1738
1739 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1740 atomic_dec(&cmd->t_task_cdbs_left);
1741 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1742 was_active = true;
1743 }
1744
cdbb70bb
CH		 1745 return was_active;
1746}
1747
c66ac9db
NB		 1748static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1749{
1750 struct se_task *task, *task_tmp;
1751 unsigned long flags;
1752 int ret = 0;
1753
6708bb27 1754 pr_debug("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 1755 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 1756
1757 /*
1758 * No tasks remain in the execution queue
1759 */
a1d8b49a 1760 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1761 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 1762 &cmd->t_task_list, t_list) {
04629b7b 1763 pr_debug("Processing task %p\n", task);
c66ac9db
NB		 1764 /*
1765 * If the struct se_task has not been sent and is not active,
1766 * remove the struct se_task from the execution queue.
1767 */
6c76bf95 1768 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
a1d8b49a 1769 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1770 flags);
1771 transport_remove_task_from_execute_queue(task,
42bf829e 1772 cmd->se_dev);
c66ac9db 1773
04629b7b 1774 pr_debug("Task %p removed from execute queue\n", task);
a1d8b49a 1775 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 1776 continue;
1777 }
1778
cdbb70bb 1779 if (!target_stop_task(task, &flags)) {
04629b7b 1780 pr_debug("Task %p - did nothing\n", task);
c66ac9db
NB		 1781 ret++;
1782 }
c66ac9db 1783 }
a1d8b49a 1784 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1785
1786 return ret;
1787}
1788
c66ac9db
NB		 1789/*
1790 * Handle SAM-esque emulation for generic transport request failures.
1791 */
03e98c9e 1792static void transport_generic_request_failure(struct se_cmd *cmd)
c66ac9db 1793{
07bde79a
NB		 1794 int ret = 0;
1795
6708bb27 1796 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1797 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1798 cmd->t_task_cdb[0]);
03e98c9e 1799 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
e3d6f909 1800 cmd->se_tfo->get_cmd_state(cmd),
03e98c9e 1801 cmd->t_state, cmd->scsi_sense_reason);
6708bb27 1802 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
c66ac9db
NB		 1803 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1804 " t_transport_active: %d t_transport_stop: %d"
6708bb27 1805 " t_transport_sent: %d\n", cmd->t_task_list_num,
a1d8b49a
AG		 1806 atomic_read(&cmd->t_task_cdbs_left),
1807 atomic_read(&cmd->t_task_cdbs_sent),
1808 atomic_read(&cmd->t_task_cdbs_ex_left),
1809 atomic_read(&cmd->t_transport_active),
1810 atomic_read(&cmd->t_transport_stop),
1811 atomic_read(&cmd->t_transport_sent));
c66ac9db 1812
c66ac9db
NB		 1813 /*
1814 * For SAM Task Attribute emulation for failed struct se_cmd
1815 */
1816 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1817 transport_complete_task_attr(cmd);
1818
03e98c9e
NB		 1819 switch (cmd->scsi_sense_reason) {
1820 case TCM_NON_EXISTENT_LUN:
1821 case TCM_UNSUPPORTED_SCSI_OPCODE:
1822 case TCM_INVALID_CDB_FIELD:
1823 case TCM_INVALID_PARAMETER_LIST:
1824 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1825 case TCM_UNKNOWN_MODE_PAGE:
1826 case TCM_WRITE_PROTECTED:
1827 case TCM_CHECK_CONDITION_ABORT_CMD:
1828 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1829 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1830 break;
03e98c9e 1831 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1832 /*
1833 * No SENSE Data payload for this case, set SCSI Status
1834 * and queue the response to $FABRIC_MOD.
1835 *
1836 * Uses linux/include/scsi/scsi.h SAM status codes defs
1837 */
1838 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1839 /*
1840 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1841 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1842 * CONFLICT STATUS.
1843 *
1844 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1845 */
e3d6f909
AG		 1846 if (cmd->se_sess &&
1847 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1848 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1849 cmd->orig_fe_lun, 0x2C,
1850 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1851
07bde79a 1852 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1853 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1854 goto queue_full;
c66ac9db 1855 goto check_stop;
c66ac9db 1856 default:
6708bb27 1857 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
03e98c9e 1858 cmd->t_task_cdb[0], cmd->scsi_sense_reason);
c66ac9db
NB		 1859 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1860 break;
1861 }
16ab8e60
NB		 1862 /*
1863 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1864 * make the call to transport_send_check_condition_and_sense()
1865 * directly. Otherwise expect the fabric to make the call to
1866 * transport_send_check_condition_and_sense() after handling
1867 * possible unsoliticied write data payloads.
1868 */
03e98c9e
NB		 1869 ret = transport_send_check_condition_and_sense(cmd,
1870 cmd->scsi_sense_reason, 0);
1871 if (ret == -EAGAIN || ret == -ENOMEM)
1872 goto queue_full;
07bde79a 1873
c66ac9db
NB		 1874check_stop:
1875 transport_lun_remove_cmd(cmd);
6708bb27 1876 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1877 ;
07bde79a
NB		 1878 return;
1879
1880queue_full:
e057f533
CH		 1881 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1882 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1883}
1884
c66ac9db
NB		 1885static inline u32 transport_lba_21(unsigned char *cdb)
1886{
1887 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1888}
1889
1890static inline u32 transport_lba_32(unsigned char *cdb)
1891{
1892 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1893}
1894
1895static inline unsigned long long transport_lba_64(unsigned char *cdb)
1896{
1897 unsigned int __v1, __v2;
1898
1899 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1900 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1901
1902 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1903}
1904
1905/*
1906 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1907 */
1908static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1909{
1910 unsigned int __v1, __v2;
1911
1912 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1913 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1914
1915 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1916}
1917
1918static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1919{
1920 unsigned long flags;
1921
a1d8b49a 1922 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 1923 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 1924 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 1925}
1926
c66ac9db
NB		 1927static inline int transport_tcq_window_closed(struct se_device *dev)
1928{
1929 if (dev->dev_tcq_window_closed++ <
1930 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
1931 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
1932 } else
1933 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
1934
e3d6f909 1935 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 1936 return 0;
1937}
1938
1939/*
1940 * Called from Fabric Module context from transport_execute_tasks()
1941 *
1942 * The return of this function determins if the tasks from struct se_cmd
1943 * get added to the execution queue in transport_execute_tasks(),
1944 * or are added to the delayed or ordered lists here.
1945 */
1946static inline int transport_execute_task_attr(struct se_cmd *cmd)
1947{
5951146d 1948 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1949 return 1;
1950 /*
25985edc 1951 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1952 * to allow the passed struct se_cmd list of tasks to the front of the list.
1953 */
e66ecd50 1954 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
5951146d 1955 atomic_inc(&cmd->se_dev->dev_hoq_count);
c66ac9db 1956 smp_mb__after_atomic_inc();
6708bb27 1957 pr_debug("Added HEAD_OF_QUEUE for CDB:"
c66ac9db 1958 " 0x%02x, se_ordered_id: %u\n",
6708bb27 1959 cmd->t_task_cdb[0],
c66ac9db
NB		 1960 cmd->se_ordered_id);
1961 return 1;
e66ecd50 1962 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d 1963 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 1964 smp_mb__after_atomic_inc();
1965
6708bb27 1966 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 1967 " list, se_ordered_id: %u\n",
a1d8b49a 1968 cmd->t_task_cdb[0],
c66ac9db
NB		 1969 cmd->se_ordered_id);
1970 /*
1971 * Add ORDERED command to tail of execution queue if
1972 * no other older commands exist that need to be
1973 * completed first.
1974 */
6708bb27 1975 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 1976 return 1;
1977 } else {
1978 /*
1979 * For SIMPLE and UNTAGGED Task Attribute commands
1980 */
5951146d 1981 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 1982 smp_mb__after_atomic_inc();
1983 }
1984 /*
1985 * Otherwise if one or more outstanding ORDERED task attribute exist,
1986 * add the dormant task(s) built for the passed struct se_cmd to the
1987 * execution queue and become in Active state for this struct se_device.
1988 */
5951146d 1989 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 1990 /*
1991 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 1992 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 1993 */
5951146d 1994 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 1995 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 1996 list_add_tail(&cmd->se_delayed_node,
1997 &cmd->se_dev->delayed_cmd_list);
1998 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 1999
6708bb27 2000 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 2001 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 2002 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 2003 cmd->se_ordered_id);
2004 /*
2005 * Return zero to let transport_execute_tasks() know
2006 * not to add the delayed tasks to the execution list.
2007 */
2008 return 0;
2009 }
2010 /*
2011 * Otherwise, no ORDERED task attributes exist..
2012 */
2013 return 1;
2014}
2015
2016/*
2017 * Called from fabric module context in transport_generic_new_cmd() and
2018 * transport_generic_process_write()
2019 */
2020static int transport_execute_tasks(struct se_cmd *cmd)
2021{
2022 int add_tasks;
2023
58a2801a 2024 if (se_dev_check_online(cmd->se_dev) != 0) {
03e98c9e
NB		 2025 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2026 transport_generic_request_failure(cmd);
db1620a2 2027 return 0;
c66ac9db 2028 }
db1620a2 2029
c66ac9db
NB		 2030 /*
2031 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2032 * has occurred that prevents execution.
c66ac9db 2033 */
6708bb27 2034 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 2035 /*
2036 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2037 * attribute for the tasks of the received struct se_cmd CDB
2038 */
2039 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2040 if (!add_tasks)
c66ac9db
NB		 2041 goto execute_tasks;
2042 /*
2043 * This calls transport_add_tasks_from_cmd() to handle
2044 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2045 * (if enabled) in __transport_add_task_to_execute_queue() and
2046 * transport_add_task_check_sam_attr().
2047 */
2048 transport_add_tasks_from_cmd(cmd);
2049 }
2050 /*
2051 * Kick the execution queue for the cmd associated struct se_device
2052 * storage object.
2053 */
2054execute_tasks:
5951146d 2055 __transport_execute_tasks(cmd->se_dev);
c66ac9db
NB		 2056 return 0;
2057}
2058
2059/*
2060 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2061 * from struct se_device->execute_task_list and
2062 *
2063 * Called from transport_processing_thread()
2064 */
2065static int __transport_execute_tasks(struct se_device *dev)
2066{
2067 int error;
2068 struct se_cmd *cmd = NULL;
e3d6f909 2069 struct se_task *task = NULL;
c66ac9db
NB		 2070 unsigned long flags;
2071
2072 /*
2073 * Check if there is enough room in the device and HBA queue to send
a1d8b49a 2074 * struct se_tasks to the selected transport.
c66ac9db
NB		 2075 */
2076check_depth:
e3d6f909 2077 if (!atomic_read(&dev->depth_left))
c66ac9db 2078 return transport_tcq_window_closed(dev);
c66ac9db 2079
e3d6f909 2080 dev->dev_tcq_window_closed = 0;
c66ac9db 2081
e3d6f909
AG		 2082 spin_lock_irq(&dev->execute_task_lock);
2083 if (list_empty(&dev->execute_task_list)) {
2084 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2085 return 0;
2086 }
e3d6f909
AG		 2087 task = list_first_entry(&dev->execute_task_list,
2088 struct se_task, t_execute_list);
04629b7b 2089 __transport_remove_task_from_execute_queue(task, dev);
e3d6f909 2090 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2091
2092 atomic_dec(&dev->depth_left);
c66ac9db 2093
e3d6f909 2094 cmd = task->task_se_cmd;
c66ac9db 2095
a1d8b49a 2096 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 2097 task->task_flags |= (TF_ACTIVE | TF_SENT);
a1d8b49a 2098 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2099
a1d8b49a
AG		 2100 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2101 cmd->t_task_list_num)
415a090a 2102 atomic_set(&cmd->t_transport_sent, 1);
c66ac9db 2103
a1d8b49a 2104 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2105
5bda90c8
CH		 2106 if (cmd->execute_task)
2107 error = cmd->execute_task(task);
2108 else
2109 error = dev->transport->do_task(task);
d29a5b6a 2110 if (error != 0) {
d29a5b6a
CH		 2111 spin_lock_irqsave(&cmd->t_state_lock, flags);
2112 task->task_flags &= ~TF_ACTIVE;
2113 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2114 atomic_set(&cmd->t_transport_sent, 0);
2115 transport_stop_tasks_for_cmd(cmd);
2116 atomic_inc(&dev->depth_left);
03e98c9e 2117 transport_generic_request_failure(cmd);
c66ac9db
NB		 2118 }
2119
2120 goto check_depth;
2121
2122 return 0;
2123}
2124
c66ac9db
NB		 2125static inline u32 transport_get_sectors_6(
2126 unsigned char *cdb,
2127 struct se_cmd *cmd,
2128 int *ret)
2129{
5951146d 2130 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2131
2132 /*
2133 * Assume TYPE_DISK for non struct se_device objects.
2134 * Use 8-bit sector value.
2135 */
2136 if (!dev)
2137 goto type_disk;
2138
2139 /*
2140 * Use 24-bit allocation length for TYPE_TAPE.
2141 */
e3d6f909 2142 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2143 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2144
2145 /*
2146 * Everything else assume TYPE_DISK Sector CDB location.
2147 * Use 8-bit sector value.
2148 */
2149type_disk:
2150 return (u32)cdb[4];
2151}
2152
2153static inline u32 transport_get_sectors_10(
2154 unsigned char *cdb,
2155 struct se_cmd *cmd,
2156 int *ret)
2157{
5951146d 2158 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2159
2160 /*
2161 * Assume TYPE_DISK for non struct se_device objects.
2162 * Use 16-bit sector value.
2163 */
2164 if (!dev)
2165 goto type_disk;
2166
2167 /*
2168 * XXX_10 is not defined in SSC, throw an exception
2169 */
e3d6f909
AG		 2170 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2171 *ret = -EINVAL;
c66ac9db
NB		 2172 return 0;
2173 }
2174
2175 /*
2176 * Everything else assume TYPE_DISK Sector CDB location.
2177 * Use 16-bit sector value.
2178 */
2179type_disk:
2180 return (u32)(cdb[7] << 8) + cdb[8];
2181}
2182
2183static inline u32 transport_get_sectors_12(
2184 unsigned char *cdb,
2185 struct se_cmd *cmd,
2186 int *ret)
2187{
5951146d 2188 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2189
2190 /*
2191 * Assume TYPE_DISK for non struct se_device objects.
2192 * Use 32-bit sector value.
2193 */
2194 if (!dev)
2195 goto type_disk;
2196
2197 /*
2198 * XXX_12 is not defined in SSC, throw an exception
2199 */
e3d6f909
AG		 2200 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2201 *ret = -EINVAL;
c66ac9db
NB		 2202 return 0;
2203 }
2204
2205 /*
2206 * Everything else assume TYPE_DISK Sector CDB location.
2207 * Use 32-bit sector value.
2208 */
2209type_disk:
2210 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2211}
2212
2213static inline u32 transport_get_sectors_16(
2214 unsigned char *cdb,
2215 struct se_cmd *cmd,
2216 int *ret)
2217{
5951146d 2218 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2219
2220 /*
2221 * Assume TYPE_DISK for non struct se_device objects.
2222 * Use 32-bit sector value.
2223 */
2224 if (!dev)
2225 goto type_disk;
2226
2227 /*
2228 * Use 24-bit allocation length for TYPE_TAPE.
2229 */
e3d6f909 2230 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2231 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2232
2233type_disk:
2234 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2235 (cdb[12] << 8) + cdb[13];
2236}
2237
2238/*
2239 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2240 */
2241static inline u32 transport_get_sectors_32(
2242 unsigned char *cdb,
2243 struct se_cmd *cmd,
2244 int *ret)
2245{
2246 /*
2247 * Assume TYPE_DISK for non struct se_device objects.
2248 * Use 32-bit sector value.
2249 */
2250 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2251 (cdb[30] << 8) + cdb[31];
2252
2253}
2254
2255static inline u32 transport_get_size(
2256 u32 sectors,
2257 unsigned char *cdb,
2258 struct se_cmd *cmd)
2259{
5951146d 2260 struct se_device *dev = cmd->se_dev;
c66ac9db 2261
e3d6f909 2262 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2263 if (cdb[1] & 1) { /* sectors */
e3d6f909 2264 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2265 } else /* bytes */
2266 return sectors;
2267 }
2268#if 0
6708bb27 2269 pr_debug("Returning block_size: %u, sectors: %u == %u for"
e3d6f909
AG		 2270 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2271 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2272 dev->transport->name);
c66ac9db 2273#endif
e3d6f909 2274 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2275}
2276
c66ac9db
NB		 2277static void transport_xor_callback(struct se_cmd *cmd)
2278{
2279 unsigned char *buf, *addr;
ec98f782 2280 struct scatterlist *sg;
c66ac9db
NB		 2281 unsigned int offset;
2282 int i;
ec98f782 2283 int count;
c66ac9db
NB		 2284 /*
2285 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2286 *
2287 * 1) read the specified logical block(s);
2288 * 2) transfer logical blocks from the data-out buffer;
2289 * 3) XOR the logical blocks transferred from the data-out buffer with
2290 * the logical blocks read, storing the resulting XOR data in a buffer;
2291 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2292 * blocks transferred from the data-out buffer; and
2293 * 5) transfer the resulting XOR data to the data-in buffer.
2294 */
2295 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2296 if (!buf) {
2297 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2298 return;
2299 }
2300 /*
ec98f782 2301 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2302 * into the locally allocated *buf
2303 */
ec98f782
AG		 2304 sg_copy_to_buffer(cmd->t_data_sg,
2305 cmd->t_data_nents,
2306 buf,
2307 cmd->data_length);
2308
c66ac9db
NB		 2309 /*
2310 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2311 * cmd->t_mem_bidi_list
c66ac9db
NB		 2312 */
2313
2314 offset = 0;
ec98f782
AG		 2315 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2316 addr = kmap_atomic(sg_page(sg), KM_USER0);
2317 if (!addr)
c66ac9db
NB		 2318 goto out;
2319
ec98f782
AG		 2320 for (i = 0; i < sg->length; i++)
2321 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2322
ec98f782 2323 offset += sg->length;
c66ac9db
NB		 2324 kunmap_atomic(addr, KM_USER0);
2325 }
ec98f782 2326
c66ac9db
NB		 2327out:
2328 kfree(buf);
2329}
2330
2331/*
2332 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2333 */
2334static int transport_get_sense_data(struct se_cmd *cmd)
2335{
2336 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
42bf829e 2337 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2338 struct se_task *task = NULL, *task_tmp;
2339 unsigned long flags;
2340 u32 offset = 0;
2341
e3d6f909
AG		 2342 WARN_ON(!cmd->se_lun);
2343
42bf829e
CH		 2344 if (!dev)
2345 return 0;
2346
a1d8b49a 2347 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2348 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2349 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2350 return 0;
2351 }
2352
2353 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2354 &cmd->t_task_list, t_list) {
c66ac9db
NB		 2355 if (!task->task_sense)
2356 continue;
2357
e3d6f909 2358 if (!dev->transport->get_sense_buffer) {
6708bb27 2359 pr_err("dev->transport->get_sense_buffer"
c66ac9db
NB		 2360 " is NULL\n");
2361 continue;
2362 }
2363
e3d6f909 2364 sense_buffer = dev->transport->get_sense_buffer(task);
6708bb27 2365 if (!sense_buffer) {
04629b7b 2366 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
c66ac9db 2367 " sense buffer for task with sense\n",
04629b7b 2368 cmd->se_tfo->get_task_tag(cmd), task);
c66ac9db
NB		 2369 continue;
2370 }
a1d8b49a 2371 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2372
e3d6f909 2373 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2374 TRANSPORT_SENSE_BUFFER);
2375
5951146d 2376 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2377 TRANSPORT_SENSE_BUFFER);
2378 cmd->scsi_status = task->task_scsi_status;
2379 /* Automatically padded */
2380 cmd->scsi_sense_length =
2381 (TRANSPORT_SENSE_BUFFER + offset);
2382
6708bb27 2383 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
c66ac9db 2384 " and sense\n",
e3d6f909 2385 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2386 cmd->scsi_status);
2387 return 0;
2388 }
a1d8b49a 2389 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2390
2391 return -1;
2392}
2393
ec98f782
AG		 2394static inline long long transport_dev_end_lba(struct se_device *dev)
2395{
2396 return dev->transport->get_blocks(dev) + 1;
2397}
2398
2399static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2400{
2401 struct se_device *dev = cmd->se_dev;
2402 u32 sectors;
2403
2404 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2405 return 0;
2406
2407 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2408
6708bb27
AG		 2409 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2410 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2411 " transport_dev_end_lba(): %llu\n",
2412 cmd->t_task_lba, sectors,
2413 transport_dev_end_lba(dev));
7abbe7f3 2414 return -EINVAL;
ec98f782
AG		 2415 }
2416
7abbe7f3 2417 return 0;
ec98f782
AG		 2418}
2419
706d5860
NB		 2420static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2421{
2422 /*
2423 * Determine if the received WRITE_SAME is used to for direct
2424 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2425 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2426 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2427 */
2428 int passthrough = (dev->transport->transport_type ==
2429 TRANSPORT_PLUGIN_PHBA_PDEV);
2430
2431 if (!passthrough) {
2432 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2433 pr_err("WRITE_SAME PBDATA and LBDATA"
2434 " bits not supported for Block Discard"
2435 " Emulation\n");
2436 return -ENOSYS;
2437 }
2438 /*
2439 * Currently for the emulated case we only accept
2440 * tpws with the UNMAP=1 bit set.
2441 */
2442 if (!(flags[0] & 0x08)) {
2443 pr_err("WRITE_SAME w/o UNMAP bit not"
2444 " supported for Block Discard Emulation\n");
2445 return -ENOSYS;
2446 }
2447 }
2448
2449 return 0;
2450}
2451
c66ac9db
NB		 2452/* transport_generic_cmd_sequencer():
2453 *
2454 * Generic Command Sequencer that should work for most DAS transport
2455 * drivers.
2456 *
2457 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2458 * RX Thread.
2459 *
2460 * FIXME: Need to support other SCSI OPCODES where as well.
2461 */
2462static int transport_generic_cmd_sequencer(
2463 struct se_cmd *cmd,
2464 unsigned char *cdb)
2465{
5951146d 2466 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2467 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2468 int ret = 0, sector_ret = 0, passthrough;
2469 u32 sectors = 0, size = 0, pr_reg_type = 0;
2470 u16 service_action;
2471 u8 alua_ascq = 0;
2472 /*
2473 * Check for an existing UNIT ATTENTION condition
2474 */
2475 if (core_scsi3_ua_check(cmd, cdb) < 0) {
c66ac9db
NB		 2476 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2477 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2478 return -EINVAL;
c66ac9db
NB		 2479 }
2480 /*
2481 * Check status of Asymmetric Logical Unit Assignment port
2482 */
e3d6f909 2483 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db 2484 if (ret != 0) {
c66ac9db 2485 /*
25985edc 2486 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2487 * The ALUA additional sense code qualifier (ASCQ) is determined
2488 * by the ALUA primary or secondary access state..
2489 */
2490 if (ret > 0) {
2491#if 0
6708bb27 2492 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2493 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2494 cmd->se_tfo->get_fabric_name(), alua_ascq);
c66ac9db
NB		 2495#endif
2496 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2497 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2498 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2499 return -EINVAL;
c66ac9db
NB		 2500 }
2501 goto out_invalid_cdb_field;
2502 }
2503 /*
2504 * Check status for SPC-3 Persistent Reservations
2505 */
e3d6f909
AG		 2506 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2507 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
03e98c9e
NB		 2508 cmd, cdb, pr_reg_type) != 0) {
2509 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2510 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2511 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2512 return -EBUSY;
2513 }
c66ac9db
NB		 2514 /*
2515 * This means the CDB is allowed for the SCSI Initiator port
2516 * when said port is *NOT* holding the legacy SPC-2 or
2517 * SPC-3 Persistent Reservation.
2518 */
2519 }
2520
5bda90c8
CH		 2521 /*
2522 * If we operate in passthrough mode we skip most CDB emulation and
2523 * instead hand the commands down to the physical SCSI device.
2524 */
2525 passthrough =
2526 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2527
c66ac9db
NB		 2528 switch (cdb[0]) {
2529 case READ_6:
2530 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2531 if (sector_ret)
2532 goto out_unsupported_cdb;
2533 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2534 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2535 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2536 break;
2537 case READ_10:
2538 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2539 if (sector_ret)
2540 goto out_unsupported_cdb;
2541 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2542 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2543 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2544 break;
2545 case READ_12:
2546 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2547 if (sector_ret)
2548 goto out_unsupported_cdb;
2549 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2550 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2551 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2552 break;
2553 case READ_16:
2554 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2555 if (sector_ret)
2556 goto out_unsupported_cdb;
2557 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2558 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2559 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2560 break;
2561 case WRITE_6:
2562 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2563 if (sector_ret)
2564 goto out_unsupported_cdb;
2565 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2566 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2567 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2568 break;
2569 case WRITE_10:
2570 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2571 if (sector_ret)
2572 goto out_unsupported_cdb;
2573 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2574 cmd->t_task_lba = transport_lba_32(cdb);
2d3a4b51
CH		 2575 if (cdb[1] & 0x8)
2576 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2577 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2578 break;
2579 case WRITE_12:
2580 sectors = transport_get_sectors_12(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_32(cdb);
2d3a4b51
CH		 2585 if (cdb[1] & 0x8)
2586 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2587 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2588 break;
2589 case WRITE_16:
2590 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2591 if (sector_ret)
2592 goto out_unsupported_cdb;
2593 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2594 cmd->t_task_lba = transport_lba_64(cdb);
2d3a4b51
CH		 2595 if (cdb[1] & 0x8)
2596 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2597 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2598 break;
2599 case XDWRITEREAD_10:
2600 if ((cmd->data_direction != DMA_TO_DEVICE) ||
33c3fafc 2601 !(cmd->se_cmd_flags & SCF_BIDI))
c66ac9db
NB		 2602 goto out_invalid_cdb_field;
2603 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2604 if (sector_ret)
2605 goto out_unsupported_cdb;
2606 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2607 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 2608 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
7c1c6af3 2609
5bda90c8
CH		 2610 /*
2611 * Do now allow BIDI commands for passthrough mode.
2612 */
2613 if (passthrough)
7c1c6af3 2614 goto out_unsupported_cdb;
5bda90c8 2615
c66ac9db 2616 /*
35e0e757 2617 * Setup BIDI XOR callback to be run after I/O completion.
c66ac9db
NB		 2618 */
2619 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2620 if (cdb[1] & 0x8)
2621 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2622 break;
2623 case VARIABLE_LENGTH_CMD:
2624 service_action = get_unaligned_be16(&cdb[8]);
c66ac9db
NB		 2625 switch (service_action) {
2626 case XDWRITEREAD_32:
2627 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2628 if (sector_ret)
2629 goto out_unsupported_cdb;
2630 size = transport_get_size(sectors, cdb, cmd);
2631 /*
2632 * Use WRITE_32 and READ_32 opcodes for the emulated
2633 * XDWRITE_READ_32 logic.
2634 */
a1d8b49a 2635 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 2636 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2637
5bda90c8
CH		 2638 /*
2639 * Do now allow BIDI commands for passthrough mode.
2640 */
c66ac9db 2641 if (passthrough)
7c1c6af3 2642 goto out_unsupported_cdb;
5bda90c8 2643
c66ac9db 2644 /*
35e0e757
CH		 2645 * Setup BIDI XOR callback to be run during after I/O
2646 * completion.
c66ac9db
NB		 2647 */
2648 cmd->transport_complete_callback = &transport_xor_callback;
2d3a4b51
CH		 2649 if (cdb[1] & 0x8)
2650 cmd->se_cmd_flags |= SCF_FUA;
c66ac9db
NB		 2651 break;
2652 case WRITE_SAME_32:
2653 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2654 if (sector_ret)
2655 goto out_unsupported_cdb;
dd3a5ad8 2656
6708bb27 2657 if (sectors)
12850626 2658 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2659 else {
2660 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2661 " supported\n");
2662 goto out_invalid_cdb_field;
2663 }
dd3a5ad8 2664
a1d8b49a 2665 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 2666 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2667
706d5860 2668 if (target_check_write_same_discard(&cdb[10], dev) < 0)
c66ac9db 2669 goto out_invalid_cdb_field;
5bda90c8
CH		 2670 if (!passthrough)
2671 cmd->execute_task = target_emulate_write_same;
c66ac9db
NB		 2672 break;
2673 default:
6708bb27 2674 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 2675 " 0x%04x not supported\n", service_action);
2676 goto out_unsupported_cdb;
2677 }
2678 break;
e434f1f1 2679 case MAINTENANCE_IN:
e3d6f909 2680 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2681 /* MAINTENANCE_IN from SCC-2 */
2682 /*
2683 * Check for emulated MI_REPORT_TARGET_PGS.
2684 */
e76a35d6
CH		 2685 if (cdb[1] == MI_REPORT_TARGET_PGS &&
2686 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2687 cmd->execute_task =
2688 target_emulate_report_target_port_groups;
c66ac9db
NB		 2689 }
2690 size = (cdb[6] << 24) | (cdb[7] << 16) |
2691 (cdb[8] << 8) | cdb[9];
2692 } else {
2693 /* GPCMD_SEND_KEY from multi media commands */
2694 size = (cdb[8] << 8) + cdb[9];
2695 }
05d1c7c0 2696 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2697 break;
2698 case MODE_SELECT:
2699 size = cdb[4];
2700 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2701 break;
2702 case MODE_SELECT_10:
2703 size = (cdb[7] << 8) + cdb[8];
2704 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2705 break;
2706 case MODE_SENSE:
2707 size = cdb[4];
05d1c7c0 2708 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2709 if (!passthrough)
2710 cmd->execute_task = target_emulate_modesense;
c66ac9db
NB		 2711 break;
2712 case MODE_SENSE_10:
5bda90c8
CH		 2713 size = (cdb[7] << 8) + cdb[8];
2714 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2715 if (!passthrough)
2716 cmd->execute_task = target_emulate_modesense;
2717 break;
c66ac9db
NB		 2718 case GPCMD_READ_BUFFER_CAPACITY:
2719 case GPCMD_SEND_OPC:
2720 case LOG_SELECT:
2721 case LOG_SENSE:
2722 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2723 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2724 break;
2725 case READ_BLOCK_LIMITS:
2726 size = READ_BLOCK_LEN;
05d1c7c0 2727 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2728 break;
2729 case GPCMD_GET_CONFIGURATION:
2730 case GPCMD_READ_FORMAT_CAPACITIES:
2731 case GPCMD_READ_DISC_INFO:
2732 case GPCMD_READ_TRACK_RZONE_INFO:
2733 size = (cdb[7] << 8) + cdb[8];
2734 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2735 break;
2736 case PERSISTENT_RESERVE_IN:
617c0e06 2737 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
e76a35d6 2738 cmd->execute_task = target_scsi3_emulate_pr_in;
617c0e06
CH		 2739 size = (cdb[7] << 8) + cdb[8];
2740 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2741 break;
c66ac9db 2742 case PERSISTENT_RESERVE_OUT:
617c0e06 2743 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
e76a35d6 2744 cmd->execute_task = target_scsi3_emulate_pr_out;
c66ac9db 2745 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2746 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2747 break;
2748 case GPCMD_MECHANISM_STATUS:
2749 case GPCMD_READ_DVD_STRUCTURE:
2750 size = (cdb[8] << 8) + cdb[9];
2751 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2752 break;
2753 case READ_POSITION:
2754 size = READ_POSITION_LEN;
05d1c7c0 2755 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 2756 break;
e434f1f1 2757 case MAINTENANCE_OUT:
e3d6f909 2758 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2759 /* MAINTENANCE_OUT from SCC-2
2760 *
2761 * Check for emulated MO_SET_TARGET_PGS.
2762 */
e76a35d6
CH		 2763 if (cdb[1] == MO_SET_TARGET_PGS &&
2764 su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2765 cmd->execute_task =
2766 target_emulate_set_target_port_groups;
c66ac9db
NB		 2767 }
2768
2769 size = (cdb[6] << 24) | (cdb[7] << 16) |
2770 (cdb[8] << 8) | cdb[9];
2771 } else {
2772 /* GPCMD_REPORT_KEY from multi media commands */
2773 size = (cdb[8] << 8) + cdb[9];
2774 }
05d1c7c0 2775 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2776 break;
2777 case INQUIRY:
2778 size = (cdb[3] << 8) + cdb[4];
2779 /*
2780 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2781 * See spc4r17 section 5.3
2782 */
5951146d 2783 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 2784 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 2785 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2786 if (!passthrough)
2787 cmd->execute_task = target_emulate_inquiry;
c66ac9db
NB		 2788 break;
2789 case READ_BUFFER:
2790 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2791 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2792 break;
2793 case READ_CAPACITY:
2794 size = READ_CAP_LEN;
05d1c7c0 2795 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2796 if (!passthrough)
2797 cmd->execute_task = target_emulate_readcapacity;
c66ac9db
NB		 2798 break;
2799 case READ_MEDIA_SERIAL_NUMBER:
2800 case SECURITY_PROTOCOL_IN:
2801 case SECURITY_PROTOCOL_OUT:
2802 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 2803 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2804 break;
2805 case SERVICE_ACTION_IN:
5bda90c8
CH		 2806 switch (cmd->t_task_cdb[1] & 0x1f) {
2807 case SAI_READ_CAPACITY_16:
2808 if (!passthrough)
2809 cmd->execute_task =
2810 target_emulate_readcapacity_16;
2811 break;
2812 default:
2813 if (passthrough)
2814 break;
2815
2816 pr_err("Unsupported SA: 0x%02x\n",
2817 cmd->t_task_cdb[1] & 0x1f);
2818 goto out_unsupported_cdb;
2819 }
2820 /*FALLTHROUGH*/
c66ac9db
NB		 2821 case ACCESS_CONTROL_IN:
2822 case ACCESS_CONTROL_OUT:
2823 case EXTENDED_COPY:
2824 case READ_ATTRIBUTE:
2825 case RECEIVE_COPY_RESULTS:
2826 case WRITE_ATTRIBUTE:
2827 size = (cdb[10] << 24) | (cdb[11] << 16) |
2828 (cdb[12] << 8) | cdb[13];
05d1c7c0 2829 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2830 break;
2831 case RECEIVE_DIAGNOSTIC:
2832 case SEND_DIAGNOSTIC:
2833 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 2834 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2835 break;
2836/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2837#if 0
2838 case GPCMD_READ_CD:
2839 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2840 size = (2336 * sectors);
05d1c7c0 2841 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2842 break;
2843#endif
2844 case READ_TOC:
2845 size = cdb[8];
05d1c7c0 2846 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2847 break;
2848 case REQUEST_SENSE:
2849 size = cdb[4];
05d1c7c0 2850 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2851 if (!passthrough)
2852 cmd->execute_task = target_emulate_request_sense;
c66ac9db
NB		 2853 break;
2854 case READ_ELEMENT_STATUS:
2855 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 2856 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2857 break;
2858 case WRITE_BUFFER:
2859 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2860 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2861 break;
2862 case RESERVE:
2863 case RESERVE_10:
2864 /*
2865 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2866 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2867 */
2868 if (cdb[0] == RESERVE_10)
2869 size = (cdb[7] << 8) | cdb[8];
2870 else
2871 size = cmd->data_length;
2872
2873 /*
2874 * Setup the legacy emulated handler for SPC-2 and
2875 * >= SPC-3 compatible reservation handling (CRH=1)
2876 * Otherwise, we assume the underlying SCSI logic is
2877 * is running in SPC_PASSTHROUGH, and wants reservations
2878 * emulation disabled.
2879 */
e76a35d6
CH		 2880 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2881 cmd->execute_task = target_scsi2_reservation_reserve;
c66ac9db
NB		 2882 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2883 break;
2884 case RELEASE:
2885 case RELEASE_10:
2886 /*
2887 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2888 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2889 */
2890 if (cdb[0] == RELEASE_10)
2891 size = (cdb[7] << 8) | cdb[8];
2892 else
2893 size = cmd->data_length;
2894
e76a35d6
CH		 2895 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2896 cmd->execute_task = target_scsi2_reservation_release;
c66ac9db
NB		 2897 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2898 break;
2899 case SYNCHRONIZE_CACHE:
2900 case 0x91: /* SYNCHRONIZE_CACHE_16: */
2901 /*
2902 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2903 */
2904 if (cdb[0] == SYNCHRONIZE_CACHE) {
2905 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 2906 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2907 } else {
2908 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 2909 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2910 }
2911 if (sector_ret)
2912 goto out_unsupported_cdb;
2913
2914 size = transport_get_size(sectors, cdb, cmd);
2915 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2916
5bda90c8 2917 if (passthrough)
c66ac9db 2918 break;
5bda90c8 2919
c66ac9db
NB		 2920 /*
2921 * Check to ensure that LBA + Range does not exceed past end of
7abbe7f3 2922 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
c66ac9db 2923 */
7abbe7f3
NB		 2924 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
2925 if (transport_cmd_get_valid_sectors(cmd) < 0)
2926 goto out_invalid_cdb_field;
2927 }
5bda90c8 2928 cmd->execute_task = target_emulate_synchronize_cache;
c66ac9db
NB		 2929 break;
2930 case UNMAP:
2931 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 2932 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
5bda90c8
CH		 2933 if (!passthrough)
2934 cmd->execute_task = target_emulate_unmap;
c66ac9db
NB		 2935 break;
2936 case WRITE_SAME_16:
2937 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2938 if (sector_ret)
2939 goto out_unsupported_cdb;
dd3a5ad8 2940
6708bb27 2941 if (sectors)
12850626 2942 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2943 else {
2944 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2945 goto out_invalid_cdb_field;
2946 }
dd3a5ad8 2947
5db0753b 2948 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
706d5860
NB		 2949 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2950
2951 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2952 goto out_invalid_cdb_field;
5bda90c8
CH		 2953 if (!passthrough)
2954 cmd->execute_task = target_emulate_write_same;
706d5860
NB		 2955 break;
2956 case WRITE_SAME:
2957 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2958 if (sector_ret)
2959 goto out_unsupported_cdb;
2960
2961 if (sectors)
12850626 2962 size = transport_get_size(1, cdb, cmd);
706d5860
NB		 2963 else {
2964 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2965 goto out_invalid_cdb_field;
c66ac9db 2966 }
706d5860
NB		 2967
2968 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
c66ac9db 2969 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
706d5860
NB		 2970 /*
2971 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
2972 * of byte 1 bit 3 UNMAP instead of original reserved field
2973 */
2974 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2975 goto out_invalid_cdb_field;
5bda90c8
CH		 2976 if (!passthrough)
2977 cmd->execute_task = target_emulate_write_same;
c66ac9db
NB		 2978 break;
2979 case ALLOW_MEDIUM_REMOVAL:
c66ac9db 2980 case ERASE:
c66ac9db
NB		 2981 case REZERO_UNIT:
2982 case SEEK_10:
c66ac9db
NB		 2983 case SPACE:
2984 case START_STOP:
2985 case TEST_UNIT_READY:
2986 case VERIFY:
2987 case WRITE_FILEMARKS:
5bda90c8
CH		 2988 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2989 if (!passthrough)
2990 cmd->execute_task = target_emulate_noop;
2991 break;
2992 case GPCMD_CLOSE_TRACK:
2993 case INITIALIZE_ELEMENT_STATUS:
2994 case GPCMD_LOAD_UNLOAD:
2995 case GPCMD_SET_SPEED:
c66ac9db
NB		 2996 case MOVE_MEDIUM:
2997 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2998 break;
2999 case REPORT_LUNS:
e76a35d6 3000 cmd->execute_task = target_report_luns;
c66ac9db
NB		 3001 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3002 /*
3003 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3004 * See spc4r17 section 5.3
3005 */
5951146d 3006 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3007 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3008 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3009 break;
3010 default:
6708bb27 3011 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 3012 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3013 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3014 goto out_unsupported_cdb;
3015 }
3016
3017 if (size != cmd->data_length) {
6708bb27 3018 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 3019 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3020 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3021 cmd->data_length, size, cdb[0]);
3022
3023 cmd->cmd_spdtl = size;
3024
3025 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 3026 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 3027 " WRITE data\n");
3028 goto out_invalid_cdb_field;
3029 }
3030 /*
3031 * Reject READ_* or WRITE_* with overflow/underflow for
3032 * type SCF_SCSI_DATA_SG_IO_CDB.
3033 */
6708bb27
AG		 3034 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3035 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 3036 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3037 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3038 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3039 goto out_invalid_cdb_field;
3040 }
3041
3042 if (size > cmd->data_length) {
3043 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3044 cmd->residual_count = (size - cmd->data_length);
3045 } else {
3046 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3047 cmd->residual_count = (cmd->data_length - size);
3048 }
3049 cmd->data_length = size;
3050 }
3051
5bda90c8
CH		 3052 /* reject any command that we don't have a handler for */
3053 if (!(passthrough || cmd->execute_task ||
3054 (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
3055 goto out_unsupported_cdb;
3056
d0229ae3
AG		 3057 /* Let's limit control cdbs to a page, for simplicity's sake. */
3058 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3059 size > PAGE_SIZE)
3060 goto out_invalid_cdb_field;
3061
c66ac9db
NB		 3062 transport_set_supported_SAM_opcode(cmd);
3063 return ret;
3064
3065out_unsupported_cdb:
3066 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3067 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3068 return -EINVAL;
c66ac9db
NB		 3069out_invalid_cdb_field:
3070 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3071 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3072 return -EINVAL;
c66ac9db
NB		 3073}
3074
c66ac9db 3075/*
35e0e757 3076 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 3077 * and ordered cmds need to have their tasks added to the execution queue.
3078 */
3079static void transport_complete_task_attr(struct se_cmd *cmd)
3080{
5951146d 3081 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3082 struct se_cmd *cmd_p, *cmd_tmp;
3083 int new_active_tasks = 0;
3084
e66ecd50 3085 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3086 atomic_dec(&dev->simple_cmds);
3087 smp_mb__after_atomic_dec();
3088 dev->dev_cur_ordered_id++;
6708bb27 3089 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3090 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3091 cmd->se_ordered_id);
e66ecd50 3092 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 3093 atomic_dec(&dev->dev_hoq_count);
3094 smp_mb__after_atomic_dec();
3095 dev->dev_cur_ordered_id++;
6708bb27 3096 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3097 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3098 cmd->se_ordered_id);
e66ecd50 3099 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 3100 atomic_dec(&dev->dev_ordered_sync);
3101 smp_mb__after_atomic_dec();
c66ac9db
NB		 3102
3103 dev->dev_cur_ordered_id++;
6708bb27 3104 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3105 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3106 }
3107 /*
3108 * Process all commands up to the last received
3109 * ORDERED task attribute which requires another blocking
3110 * boundary
3111 */
3112 spin_lock(&dev->delayed_cmd_lock);
3113 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3114 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3115
5951146d 3116 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3117 spin_unlock(&dev->delayed_cmd_lock);
3118
6708bb27 3119 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3120 " cmd_p: 0x%02x Task Attr: 0x%02x"
3121 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3122 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3123 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3124
3125 transport_add_tasks_from_cmd(cmd_p);
3126 new_active_tasks++;
3127
3128 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3129 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3130 break;
3131 }
3132 spin_unlock(&dev->delayed_cmd_lock);
3133 /*
3134 * If new tasks have become active, wake up the transport thread
3135 * to do the processing of the Active tasks.
3136 */
3137 if (new_active_tasks != 0)
e3d6f909 3138 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3139}
3140
e057f533 3141static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 3142{
3143 int ret = 0;
3144
e057f533
CH		 3145 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3146 transport_complete_task_attr(cmd);
3147
3148 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3149 ret = cmd->se_tfo->queue_status(cmd);
3150 if (ret)
3151 goto out;
3152 }
07bde79a
NB		 3153
3154 switch (cmd->data_direction) {
3155 case DMA_FROM_DEVICE:
3156 ret = cmd->se_tfo->queue_data_in(cmd);
3157 break;
3158 case DMA_TO_DEVICE:
ec98f782 3159 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3160 ret = cmd->se_tfo->queue_data_in(cmd);
3161 if (ret < 0)
e057f533 3162 break;
07bde79a
NB		 3163 }
3164 /* Fall through for DMA_TO_DEVICE */
3165 case DMA_NONE:
3166 ret = cmd->se_tfo->queue_status(cmd);
3167 break;
3168 default:
3169 break;
3170 }
3171
e057f533
CH		 3172out:
3173 if (ret < 0) {
3174 transport_handle_queue_full(cmd, cmd->se_dev);
3175 return;
3176 }
3177 transport_lun_remove_cmd(cmd);
3178 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3179}
3180
3181static void transport_handle_queue_full(
3182 struct se_cmd *cmd,
e057f533 3183 struct se_device *dev)
07bde79a
NB		 3184{
3185 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 3186 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3187 atomic_inc(&dev->dev_qf_count);
3188 smp_mb__after_atomic_inc();
3189 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3190
3191 schedule_work(&cmd->se_dev->qf_work_queue);
3192}
3193
35e0e757 3194static void target_complete_ok_work(struct work_struct *work)
c66ac9db 3195{
35e0e757 3196 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
07bde79a 3197 int reason = 0, ret;
35e0e757 3198
c66ac9db
NB		 3199 /*
3200 * Check if we need to move delayed/dormant tasks from cmds on the
3201 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3202 * Attribute.
3203 */
5951146d 3204 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3205 transport_complete_task_attr(cmd);
07bde79a
NB		 3206 /*
3207 * Check to schedule QUEUE_FULL work, or execute an existing
3208 * cmd->transport_qf_callback()
3209 */
3210 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3211 schedule_work(&cmd->se_dev->qf_work_queue);
3212
c66ac9db
NB		 3213 /*
3214 * Check if we need to retrieve a sense buffer from
3215 * the struct se_cmd in question.
3216 */
3217 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3218 if (transport_get_sense_data(cmd) < 0)
3219 reason = TCM_NON_EXISTENT_LUN;
3220
3221 /*
3222 * Only set when an struct se_task->task_scsi_status returned
3223 * a non GOOD status.
3224 */
3225 if (cmd->scsi_status) {
07bde79a 3226 ret = transport_send_check_condition_and_sense(
c66ac9db 3227 cmd, reason, 1);
f147abb4 3228 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3229 goto queue_full;
3230
c66ac9db
NB		 3231 transport_lun_remove_cmd(cmd);
3232 transport_cmd_check_stop_to_fabric(cmd);
3233 return;
3234 }
3235 }
3236 /*
25985edc 3237 * Check for a callback, used by amongst other things
c66ac9db
NB		 3238 * XDWRITE_READ_10 emulation.
3239 */
3240 if (cmd->transport_complete_callback)
3241 cmd->transport_complete_callback(cmd);
3242
3243 switch (cmd->data_direction) {
3244 case DMA_FROM_DEVICE:
3245 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3246 if (cmd->se_lun->lun_sep) {
3247 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3248 cmd->data_length;
3249 }
3250 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3251
07bde79a 3252 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3253 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3254 goto queue_full;
c66ac9db
NB		 3255 break;
3256 case DMA_TO_DEVICE:
3257 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3258 if (cmd->se_lun->lun_sep) {
3259 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3260 cmd->data_length;
3261 }
3262 spin_unlock(&cmd->se_lun->lun_sep_lock);
3263 /*
3264 * Check if we need to send READ payload for BIDI-COMMAND
3265 */
ec98f782 3266 if (cmd->t_bidi_data_sg) {
c66ac9db 3267 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3268 if (cmd->se_lun->lun_sep) {
3269 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3270 cmd->data_length;
3271 }
3272 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 3273 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 3274 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3275 goto queue_full;
c66ac9db
NB		 3276 break;
3277 }
3278 /* Fall through for DMA_TO_DEVICE */
3279 case DMA_NONE:
07bde79a 3280 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 3281 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 3282 goto queue_full;
c66ac9db
NB		 3283 break;
3284 default:
3285 break;
3286 }
3287
3288 transport_lun_remove_cmd(cmd);
3289 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3290 return;
3291
3292queue_full:
6708bb27 3293 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 3294 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 3295 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3296 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 3297}
3298
3299static void transport_free_dev_tasks(struct se_cmd *cmd)
3300{
3301 struct se_task *task, *task_tmp;
3302 unsigned long flags;
0c2cfe5f 3303 LIST_HEAD(dispose_list);
c66ac9db 3304
a1d8b49a 3305 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3306 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3307 &cmd->t_task_list, t_list) {
0c2cfe5f
CH		 3308 if (!(task->task_flags & TF_ACTIVE))
3309 list_move_tail(&task->t_list, &dispose_list);
3310 }
3311 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3312
3313 while (!list_empty(&dispose_list)) {
3314 task = list_first_entry(&dispose_list, struct se_task, t_list);
c66ac9db 3315
af3f00c7
CH		 3316 if (task->task_sg != cmd->t_data_sg &&
3317 task->task_sg != cmd->t_bidi_data_sg)
3318 kfree(task->task_sg);
c66ac9db
NB		 3319
3320 list_del(&task->t_list);
3321
42bf829e 3322 cmd->se_dev->transport->free_task(task);
c66ac9db 3323 }
c66ac9db
NB		 3324}
3325
6708bb27 3326static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3327{
ec98f782 3328 struct scatterlist *sg;
ec98f782 3329 int count;
c66ac9db 3330
6708bb27
AG		 3331 for_each_sg(sgl, sg, nents, count)
3332 __free_page(sg_page(sg));
c66ac9db 3333
6708bb27
AG		 3334 kfree(sgl);
3335}
c66ac9db 3336
6708bb27
AG		 3337static inline void transport_free_pages(struct se_cmd *cmd)
3338{
3339 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3340 return;
3341
3342 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3343 cmd->t_data_sg = NULL;
3344 cmd->t_data_nents = 0;
c66ac9db 3345
6708bb27 3346 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3347 cmd->t_bidi_data_sg = NULL;
3348 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3349}
3350
d3df7825
CH		 3351/**
3352 * transport_put_cmd - release a reference to a command
3353 * @cmd: command to release
3354 *
3355 * This routine releases our reference to the command and frees it if possible.
3356 */
39c05f32 3357static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 3358{
3359 unsigned long flags;
4911e3cc 3360 int free_tasks = 0;
c66ac9db 3361
a1d8b49a 3362 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 3363 if (atomic_read(&cmd->t_fe_count)) {
3364 if (!atomic_dec_and_test(&cmd->t_fe_count))
3365 goto out_busy;
3366 }
3367
3368 if (atomic_read(&cmd->t_se_count)) {
3369 if (!atomic_dec_and_test(&cmd->t_se_count))
3370 goto out_busy;
3371 }
3372
3373 if (atomic_read(&cmd->transport_dev_active)) {
3374 atomic_set(&cmd->transport_dev_active, 0);
3375 transport_all_task_dev_remove_state(cmd);
3376 free_tasks = 1;
c66ac9db 3377 }
a1d8b49a 3378 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3379
4911e3cc
CH		 3380 if (free_tasks != 0)
3381 transport_free_dev_tasks(cmd);
d3df7825 3382
c66ac9db 3383 transport_free_pages(cmd);
31afc39c 3384 transport_release_cmd(cmd);
39c05f32 3385 return;
4911e3cc
CH		 3386out_busy:
3387 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3388}
3389
c66ac9db 3390/*
ec98f782
AG		 3391 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3392 * allocating in the core.
c66ac9db
NB		 3393 * @cmd: Associated se_cmd descriptor
3394 * @mem: SGL style memory for TCM WRITE / READ
3395 * @sg_mem_num: Number of SGL elements
3396 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3397 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3398 *
3399 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3400 * of parameters.
3401 */
3402int transport_generic_map_mem_to_cmd(
3403 struct se_cmd *cmd,
5951146d
AG		 3404 struct scatterlist *sgl,
3405 u32 sgl_count,
3406 struct scatterlist *sgl_bidi,
3407 u32 sgl_bidi_count)
c66ac9db 3408{
5951146d 3409 if (!sgl || !sgl_count)
c66ac9db 3410 return 0;
c66ac9db 3411
c66ac9db
NB		 3412 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3413 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
c66ac9db 3414
ec98f782
AG		 3415 cmd->t_data_sg = sgl;
3416 cmd->t_data_nents = sgl_count;
c66ac9db 3417
ec98f782
AG		 3418 if (sgl_bidi && sgl_bidi_count) {
3419 cmd->t_bidi_data_sg = sgl_bidi;
3420 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3421 }
3422 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3423 }
3424
3425 return 0;
3426}
3427EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3428
05d1c7c0
AG		 3429void *transport_kmap_first_data_page(struct se_cmd *cmd)
3430{
ec98f782 3431 struct scatterlist *sg = cmd->t_data_sg;
05d1c7c0 3432
ec98f782 3433 BUG_ON(!sg);
05d1c7c0 3434 /*
ec98f782
AG		 3435 * We need to take into account a possible offset here for fabrics like
3436 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3437 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3438 */
ec98f782 3439 return kmap(sg_page(sg)) + sg->offset;
05d1c7c0
AG		 3440}
3441EXPORT_SYMBOL(transport_kmap_first_data_page);
3442
3443void transport_kunmap_first_data_page(struct se_cmd *cmd)
3444{
ec98f782 3445 kunmap(sg_page(cmd->t_data_sg));
05d1c7c0
AG		 3446}
3447EXPORT_SYMBOL(transport_kunmap_first_data_page);
3448
c66ac9db 3449static int
05d1c7c0 3450transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3451{
ec98f782
AG		 3452 u32 length = cmd->data_length;
3453 unsigned int nents;
3454 struct page *page;
3455 int i = 0;
c66ac9db 3456
ec98f782
AG		 3457 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3458 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3459 if (!cmd->t_data_sg)
3460 return -ENOMEM;
c66ac9db 3461
ec98f782
AG		 3462 cmd->t_data_nents = nents;
3463 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3464
ec98f782
AG		 3465 while (length) {
3466 u32 page_len = min_t(u32, length, PAGE_SIZE);
3467 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3468 if (!page)
3469 goto out;
c66ac9db 3470
ec98f782
AG		 3471 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3472 length -= page_len;
3473 i++;
c66ac9db 3474 }
c66ac9db 3475 return 0;
c66ac9db 3476
ec98f782
AG		 3477out:
3478 while (i >= 0) {
3479 __free_page(sg_page(&cmd->t_data_sg[i]));
3480 i--;
c66ac9db 3481 }
ec98f782
AG		 3482 kfree(cmd->t_data_sg);
3483 cmd->t_data_sg = NULL;
3484 return -ENOMEM;
c66ac9db
NB		 3485}
3486
a1d8b49a
AG		 3487/* Reduce sectors if they are too long for the device */
3488static inline sector_t transport_limit_task_sectors(
c66ac9db
NB		 3489 struct se_device *dev,
3490 unsigned long long lba,
a1d8b49a 3491 sector_t sectors)
c66ac9db 3492{
a1d8b49a 3493 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db 3494
a1d8b49a
AG		 3495 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3496 if ((lba + sectors) > transport_dev_end_lba(dev))
3497 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
c66ac9db 3498
a1d8b49a 3499 return sectors;
c66ac9db
NB		 3500}
3501
c66ac9db
NB		 3502
3503/*
3504 * This function can be used by HW target mode drivers to create a linked
3505 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3506 * This is intended to be called during the completion path by TCM Core
3507 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3508 */
3509void transport_do_task_sg_chain(struct se_cmd *cmd)
3510{
ec98f782
AG		 3511 struct scatterlist *sg_first = NULL;
3512 struct scatterlist *sg_prev = NULL;
3513 int sg_prev_nents = 0;
3514 struct scatterlist *sg;
c66ac9db 3515 struct se_task *task;
ec98f782 3516 u32 chained_nents = 0;
c66ac9db
NB		 3517 int i;
3518
ec98f782
AG		 3519 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3520
c66ac9db
NB		 3521 /*
3522 * Walk the struct se_task list and setup scatterlist chains
a1d8b49a 3523 * for each contiguously allocated struct se_task->task_sg[].
c66ac9db 3524 */
a1d8b49a 3525 list_for_each_entry(task, &cmd->t_task_list, t_list) {
ec98f782 3526 if (!task->task_sg)
c66ac9db
NB		 3527 continue;
3528
ec98f782
AG		 3529 if (!sg_first) {
3530 sg_first = task->task_sg;
6708bb27 3531 chained_nents = task->task_sg_nents;
97868c89 3532 } else {
ec98f782 3533 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
6708bb27 3534 chained_nents += task->task_sg_nents;
97868c89 3535 }
c3c74c7a
NB		 3536 /*
3537 * For the padded tasks, use the extra SGL vector allocated
3538 * in transport_allocate_data_tasks() for the sg_prev_nents
04629b7b
CH		 3539 * offset into sg_chain() above.
3540 *
3541 * We do not need the padding for the last task (or a single
3542 * task), but in that case we will never use the sg_prev_nents
3543 * value below which would be incorrect.
c3c74c7a 3544 */
04629b7b 3545 sg_prev_nents = (task->task_sg_nents + 1);
ec98f782 3546 sg_prev = task->task_sg;
c66ac9db
NB		 3547 }
3548 /*
3549 * Setup the starting pointer and total t_tasks_sg_linked_no including
3550 * padding SGs for linking and to mark the end.
3551 */
a1d8b49a 3552 cmd->t_tasks_sg_chained = sg_first;
ec98f782 3553 cmd->t_tasks_sg_chained_no = chained_nents;
c66ac9db 3554
6708bb27 3555 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
a1d8b49a
AG		 3556 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3557 cmd->t_tasks_sg_chained_no);
c66ac9db 3558
a1d8b49a
AG		 3559 for_each_sg(cmd->t_tasks_sg_chained, sg,
3560 cmd->t_tasks_sg_chained_no, i) {
c66ac9db 3561
6708bb27 3562 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
5951146d 3563 i, sg, sg_page(sg), sg->length, sg->offset);
c66ac9db 3564 if (sg_is_chain(sg))
6708bb27 3565 pr_debug("SG: %p sg_is_chain=1\n", sg);
c66ac9db 3566 if (sg_is_last(sg))
6708bb27 3567 pr_debug("SG: %p sg_is_last=1\n", sg);
c66ac9db 3568 }
c66ac9db
NB		 3569}
3570EXPORT_SYMBOL(transport_do_task_sg_chain);
3571
a1d8b49a
AG		 3572/*
3573 * Break up cmd into chunks transport can handle
3574 */
38b40067
CH		 3575static int
3576transport_allocate_data_tasks(struct se_cmd *cmd,
c66ac9db 3577 enum dma_data_direction data_direction,
38b40067 3578 struct scatterlist *cmd_sg, unsigned int sgl_nents)
c66ac9db 3579{
5951146d 3580 struct se_device *dev = cmd->se_dev;
a3eedc22 3581 int task_count, i;
38b40067
CH		 3582 unsigned long long lba;
3583 sector_t sectors, dev_max_sectors;
3584 u32 sector_size;
3585
3586 if (transport_cmd_get_valid_sectors(cmd) < 0)
3587 return -EINVAL;
3588
3589 dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3590 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
a1d8b49a 3591
ec98f782 3592 WARN_ON(cmd->data_length % sector_size);
38b40067
CH		 3593
3594 lba = cmd->t_task_lba;
ec98f782 3595 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
277c5f27 3596 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
af3f00c7
CH		 3597
3598 /*
3599 * If we need just a single task reuse the SG list in the command
3600 * and avoid a lot of work.
3601 */
3602 if (task_count == 1) {
3603 struct se_task *task;
3604 unsigned long flags;
3605
3606 task = transport_generic_get_task(cmd, data_direction);
3607 if (!task)
3608 return -ENOMEM;
3609
3610 task->task_sg = cmd_sg;
3611 task->task_sg_nents = sgl_nents;
3612
3613 task->task_lba = lba;
3614 task->task_sectors = sectors;
3615 task->task_size = task->task_sectors * sector_size;
3616
3617 spin_lock_irqsave(&cmd->t_state_lock, flags);
3618 list_add_tail(&task->t_list, &cmd->t_task_list);
3619 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3620
3621 return task_count;
3622 }
3623
ec98f782 3624 for (i = 0; i < task_count; i++) {
38b40067 3625 struct se_task *task;
c3c74c7a 3626 unsigned int task_size, task_sg_nents_padded;
38b40067
CH		 3627 struct scatterlist *sg;
3628 unsigned long flags;
ec98f782 3629 int count;
a1d8b49a 3630
c66ac9db 3631 task = transport_generic_get_task(cmd, data_direction);
a1d8b49a 3632 if (!task)
ec98f782 3633 return -ENOMEM;
c66ac9db 3634
c66ac9db 3635 task->task_lba = lba;
ec98f782
AG		 3636 task->task_sectors = min(sectors, dev_max_sectors);
3637 task->task_size = task->task_sectors * sector_size;
c66ac9db 3638
525a48a2
NB		 3639 /*
3640 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3641 * in order to calculate the number per task SGL entries
3642 */
3643 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
c66ac9db 3644 /*
ec98f782
AG		 3645 * Check if the fabric module driver is requesting that all
3646 * struct se_task->task_sg[] be chained together.. If so,
3647 * then allocate an extra padding SG entry for linking and
c3c74c7a
NB		 3648 * marking the end of the chained SGL for every task except
3649 * the last one for (task_count > 1) operation, or skipping
3650 * the extra padding for the (task_count == 1) case.
c66ac9db 3651 */
c3c74c7a
NB		 3652 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3653 task_sg_nents_padded = (task->task_sg_nents + 1);
c3c74c7a
NB		 3654 } else
3655 task_sg_nents_padded = task->task_sg_nents;
c66ac9db 3656
1d20bb61 3657 task->task_sg = kmalloc(sizeof(struct scatterlist) *
c3c74c7a 3658 task_sg_nents_padded, GFP_KERNEL);
ec98f782
AG		 3659 if (!task->task_sg) {
3660 cmd->se_dev->transport->free_task(task);
3661 return -ENOMEM;
3662 }
3663
c3c74c7a 3664 sg_init_table(task->task_sg, task_sg_nents_padded);
c66ac9db 3665
ec98f782
AG		 3666 task_size = task->task_size;
3667
3668 /* Build new sgl, only up to task_size */
6708bb27 3669 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
ec98f782
AG		 3670 if (cmd_sg->length > task_size)
3671 break;
3672
3673 *sg = *cmd_sg;
3674 task_size -= cmd_sg->length;
3675 cmd_sg = sg_next(cmd_sg);
c66ac9db 3676 }
c66ac9db 3677
ec98f782
AG		 3678 lba += task->task_sectors;
3679 sectors -= task->task_sectors;
c66ac9db 3680
ec98f782
AG		 3681 spin_lock_irqsave(&cmd->t_state_lock, flags);
3682 list_add_tail(&task->t_list, &cmd->t_task_list);
3683 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3684 }
3685
ec98f782 3686 return task_count;
c66ac9db
NB		 3687}
3688
3689static int
ec98f782 3690transport_allocate_control_task(struct se_cmd *cmd)
c66ac9db 3691{
c66ac9db 3692 struct se_task *task;
ec98f782 3693 unsigned long flags;
c66ac9db
NB		 3694
3695 task = transport_generic_get_task(cmd, cmd->data_direction);
3696 if (!task)
ec98f782 3697 return -ENOMEM;
c66ac9db 3698
af3f00c7 3699 task->task_sg = cmd->t_data_sg;
c66ac9db 3700 task->task_size = cmd->data_length;
6708bb27 3701 task->task_sg_nents = cmd->t_data_nents;
c66ac9db 3702
ec98f782
AG		 3703 spin_lock_irqsave(&cmd->t_state_lock, flags);
3704 list_add_tail(&task->t_list, &cmd->t_task_list);
3705 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3706
6708bb27 3707 /* Success! Return number of tasks allocated */
a3eedc22 3708 return 1;
ec98f782
AG		 3709}
3710
da0f7619
CH		 3711/*
3712 * Allocate any required ressources to execute the command, and either place
3713 * it on the execution queue if possible. For writes we might not have the
3714 * payload yet, thus notify the fabric via a call to ->write_pending instead.
c66ac9db 3715 */
a1d8b49a 3716int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 3717{
da0f7619 3718 struct se_device *dev = cmd->se_dev;
9ac54987 3719 int task_cdbs, task_cdbs_bidi = 0;
da0f7619 3720 int set_counts = 1;
c66ac9db
NB		 3721 int ret = 0;
3722
3723 /*
3724 * Determine is the TCM fabric module has already allocated physical
3725 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 3726 * beforehand.
c66ac9db 3727 */
ec98f782
AG		 3728 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3729 cmd->data_length) {
05d1c7c0 3730 ret = transport_generic_get_mem(cmd);
c66ac9db 3731 if (ret < 0)
03e98c9e 3732 goto out_fail;
c66ac9db 3733 }
da0f7619 3734
1d20bb61 3735 /*
38b40067 3736 * For BIDI command set up the read tasks first.
1d20bb61 3737 */
da0f7619 3738 if (cmd->t_bidi_data_sg &&
38b40067
CH		 3739 dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
3740 BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB));
3741
9ac54987
NB		 3742 task_cdbs_bidi = transport_allocate_data_tasks(cmd,
3743 DMA_FROM_DEVICE, cmd->t_bidi_data_sg,
3744 cmd->t_bidi_data_nents);
3745 if (task_cdbs_bidi <= 0)
da0f7619
CH		 3746 goto out_fail;
3747
3748 atomic_inc(&cmd->t_fe_count);
3749 atomic_inc(&cmd->t_se_count);
3750 set_counts = 0;
3751 }
38b40067
CH		 3752
3753 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3754 task_cdbs = transport_allocate_data_tasks(cmd,
3755 cmd->data_direction, cmd->t_data_sg,
3756 cmd->t_data_nents);
3757 } else {
3758 task_cdbs = transport_allocate_control_task(cmd);
3759 }
3760
da0f7619
CH		 3761 if (task_cdbs <= 0)
3762 goto out_fail;
3763
3764 if (set_counts) {
3765 atomic_inc(&cmd->t_fe_count);
3766 atomic_inc(&cmd->t_se_count);
3767 }
3768
9ac54987
NB		 3769 cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi);
3770 atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num);
3771 atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num);
da0f7619 3772
c66ac9db 3773 /*
a1d8b49a 3774 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 3775 * This WRITE struct se_cmd (and all of its associated struct se_task's)
3776 * will be added to the struct se_device execution queue after its WRITE
3777 * data has arrived. (ie: It gets handled by the transport processing
3778 * thread a second time)
3779 */
3780 if (cmd->data_direction == DMA_TO_DEVICE) {
3781 transport_add_tasks_to_state_queue(cmd);
3782 return transport_generic_write_pending(cmd);
3783 }
3784 /*
3785 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
3786 * to the execution queue.
3787 */
3788 transport_execute_tasks(cmd);
3789 return 0;
da0f7619
CH		 3790
3791out_fail:
3792 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3793 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3794 return -EINVAL;
c66ac9db 3795}
a1d8b49a 3796EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 3797
3798/* transport_generic_process_write():
3799 *
3800 *
3801 */
3802void transport_generic_process_write(struct se_cmd *cmd)
3803{
c66ac9db
NB		 3804 transport_execute_tasks(cmd);
3805}
3806EXPORT_SYMBOL(transport_generic_process_write);
3807
e057f533 3808static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 3809{
f147abb4
NB		 3810 int ret;
3811
3812 ret = cmd->se_tfo->write_pending(cmd);
3813 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 3814 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3815 cmd);
3816 transport_handle_queue_full(cmd, cmd->se_dev);
3817 }
07bde79a
NB		 3818}
3819
c66ac9db
NB		 3820static int transport_generic_write_pending(struct se_cmd *cmd)
3821{
3822 unsigned long flags;
3823 int ret;
3824
a1d8b49a 3825 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3826 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 3827 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a 3828
c66ac9db
NB		 3829 /*
3830 * Clear the se_cmd for WRITE_PENDING status in order to set
a1d8b49a 3831 * cmd->t_transport_active=0 so that transport_generic_handle_data
c66ac9db 3832 * can be called from HW target mode interrupt code. This is safe
e3d6f909 3833 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 3834 * because the se_cmd->se_lun pointer is not being cleared.
3835 */
3836 transport_cmd_check_stop(cmd, 1, 0);
3837
3838 /*
3839 * Call the fabric write_pending function here to let the
3840 * frontend know that WRITE buffers are ready.
3841 */
e3d6f909 3842 ret = cmd->se_tfo->write_pending(cmd);
f147abb4 3843 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a
NB		 3844 goto queue_full;
3845 else if (ret < 0)
c66ac9db
NB		 3846 return ret;
3847
03e98c9e 3848 return 1;
07bde79a
NB		 3849
3850queue_full:
6708bb27 3851 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a 3852 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
e057f533 3853 transport_handle_queue_full(cmd, cmd->se_dev);
f147abb4 3854 return 0;
c66ac9db
NB		 3855}
3856
2dbc43d2
CH		 3857/**
3858 * transport_release_cmd - free a command
3859 * @cmd: command to free
3860 *
3861 * This routine unconditionally frees a command, and reference counting
3862 * or list removal must be done in the caller.
3863 */
35462975 3864void transport_release_cmd(struct se_cmd *cmd)
c66ac9db 3865{
e3d6f909 3866 BUG_ON(!cmd->se_tfo);
c66ac9db 3867
2dbc43d2
CH		 3868 if (cmd->se_tmr_req)
3869 core_tmr_release_req(cmd->se_tmr_req);
3870 if (cmd->t_task_cdb != cmd->__t_task_cdb)
3871 kfree(cmd->t_task_cdb);
a17f091d
NB		 3872 /*
3873 * Check if target_wait_for_sess_cmds() is expecting to
3874 * release se_cmd directly here..
3875 */
3876 if (cmd->check_release != 0 && cmd->se_tfo->check_release_cmd)
3877 if (cmd->se_tfo->check_release_cmd(cmd) != 0)
3878 return;
3879
35462975 3880 cmd->se_tfo->release_cmd(cmd);
c66ac9db 3881}
35462975 3882EXPORT_SYMBOL(transport_release_cmd);
c66ac9db 3883
39c05f32 3884void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 3885{
d14921d6
NB		 3886 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
3887 if (wait_for_tasks && cmd->se_tmr_req)
3888 transport_wait_for_tasks(cmd);
3889
35462975 3890 transport_release_cmd(cmd);
d14921d6
NB		 3891 } else {
3892 if (wait_for_tasks)
3893 transport_wait_for_tasks(cmd);
3894
c66ac9db
NB		 3895 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3896
82f1c8a4 3897 if (cmd->se_lun)
c66ac9db 3898 transport_lun_remove_cmd(cmd);
c66ac9db 3899
f4366772
NB		 3900 transport_free_dev_tasks(cmd);
3901
39c05f32 3902 transport_put_cmd(cmd);
c66ac9db
NB		 3903 }
3904}
3905EXPORT_SYMBOL(transport_generic_free_cmd);
3906
a17f091d
NB		 3907/* target_get_sess_cmd - Add command to active ->sess_cmd_list
3908 * @se_sess: session to reference
3909 * @se_cmd: command descriptor to add
3910 */
3911void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
3912{
3913 unsigned long flags;
3914
3915 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3916 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
3917 se_cmd->check_release = 1;
3918 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3919}
3920EXPORT_SYMBOL(target_get_sess_cmd);
3921
3922/* target_put_sess_cmd - Check for active I/O shutdown or list delete
3923 * @se_sess: session to reference
3924 * @se_cmd: command descriptor to drop
3925 */
3926int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
3927{
3928 unsigned long flags;
3929
3930 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3931 if (list_empty(&se_cmd->se_cmd_list)) {
3932 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3933 WARN_ON(1);
3934 return 0;
3935 }
3936
3937 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
3938 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3939 complete(&se_cmd->cmd_wait_comp);
3940 return 1;
3941 }
3942 list_del(&se_cmd->se_cmd_list);
3943 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3944
3945 return 0;
3946}
3947EXPORT_SYMBOL(target_put_sess_cmd);
3948
3949/* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
3950 * @se_sess: session to split
3951 */
3952void target_splice_sess_cmd_list(struct se_session *se_sess)
3953{
3954 struct se_cmd *se_cmd;
3955 unsigned long flags;
3956
3957 WARN_ON(!list_empty(&se_sess->sess_wait_list));
3958 INIT_LIST_HEAD(&se_sess->sess_wait_list);
3959
3960 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3961 se_sess->sess_tearing_down = 1;
3962
3963 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
3964
3965 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
3966 se_cmd->cmd_wait_set = 1;
3967
3968 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3969}
3970EXPORT_SYMBOL(target_splice_sess_cmd_list);
3971
3972/* target_wait_for_sess_cmds - Wait for outstanding descriptors
3973 * @se_sess: session to wait for active I/O
3974 * @wait_for_tasks: Make extra transport_wait_for_tasks call
3975 */
3976void target_wait_for_sess_cmds(
3977 struct se_session *se_sess,
3978 int wait_for_tasks)
3979{
3980 struct se_cmd *se_cmd, *tmp_cmd;
3981 bool rc = false;
3982
3983 list_for_each_entry_safe(se_cmd, tmp_cmd,
3984 &se_sess->sess_wait_list, se_cmd_list) {
3985 list_del(&se_cmd->se_cmd_list);
3986
3987 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
3988 " %d\n", se_cmd, se_cmd->t_state,
3989 se_cmd->se_tfo->get_cmd_state(se_cmd));
3990
3991 if (wait_for_tasks) {
3992 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
3993 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3994 se_cmd->se_tfo->get_cmd_state(se_cmd));
3995
3996 rc = transport_wait_for_tasks(se_cmd);
3997
3998 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
3999 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4000 se_cmd->se_tfo->get_cmd_state(se_cmd));
4001 }
4002
4003 if (!rc) {
4004 wait_for_completion(&se_cmd->cmd_wait_comp);
4005 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
4006 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4007 se_cmd->se_tfo->get_cmd_state(se_cmd));
4008 }
4009
4010 se_cmd->se_tfo->release_cmd(se_cmd);
4011 }
4012}
4013EXPORT_SYMBOL(target_wait_for_sess_cmds);
4014
c66ac9db
NB		 4015/* transport_lun_wait_for_tasks():
4016 *
4017 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4018 * an struct se_lun to be successfully shutdown.
4019 */
4020static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4021{
4022 unsigned long flags;
4023 int ret;
4024 /*
4025 * If the frontend has already requested this struct se_cmd to
4026 * be stopped, we can safely ignore this struct se_cmd.
4027 */
a1d8b49a
AG		 4028 spin_lock_irqsave(&cmd->t_state_lock, flags);
4029 if (atomic_read(&cmd->t_transport_stop)) {
4030 atomic_set(&cmd->transport_lun_stop, 0);
6708bb27 4031 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
e3d6f909 4032 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4033 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4034 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 4035 return -EPERM;
c66ac9db 4036 }
a1d8b49a
AG		 4037 atomic_set(&cmd->transport_lun_fe_stop, 1);
4038 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4039
5951146d 4040 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 4041
4042 ret = transport_stop_tasks_for_cmd(cmd);
4043
6708bb27
AG		 4044 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4045 " %d\n", cmd, cmd->t_task_list_num, ret);
c66ac9db 4046 if (!ret) {
6708bb27 4047 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 4048 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4049 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 4050 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 4051 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4052 }
3df8d40b 4053 transport_remove_cmd_from_queue(cmd);
c66ac9db
NB		 4054
4055 return 0;
4056}
4057
c66ac9db
NB		 4058static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4059{
4060 struct se_cmd *cmd = NULL;
4061 unsigned long lun_flags, cmd_flags;
4062 /*
4063 * Do exception processing and return CHECK_CONDITION status to the
4064 * Initiator Port.
4065 */
4066 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 4067 while (!list_empty(&lun->lun_cmd_list)) {
4068 cmd = list_first_entry(&lun->lun_cmd_list,
4069 struct se_cmd, se_lun_node);
4070 list_del(&cmd->se_lun_node);
4071
a1d8b49a 4072 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db
NB		 4073 /*
4074 * This will notify iscsi_target_transport.c:
4075 * transport_cmd_check_stop() that a LUN shutdown is in
4076 * progress for the iscsi_cmd_t.
4077 */
a1d8b49a 4078 spin_lock(&cmd->t_state_lock);
6708bb27 4079 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 4080 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 4081 cmd->se_lun->unpacked_lun,
4082 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a
AG		 4083 atomic_set(&cmd->transport_lun_stop, 1);
4084 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 4085
4086 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4087
6708bb27
AG		 4088 if (!cmd->se_lun) {
4089 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 4090 cmd->se_tfo->get_task_tag(cmd),
4091 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 4092 BUG();
4093 }
4094 /*
4095 * If the Storage engine still owns the iscsi_cmd_t, determine
4096 * and/or stop its context.
4097 */
6708bb27 4098 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 4099 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4100 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4101
e3d6f909 4102 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 4103 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4104 continue;
4105 }
4106
6708bb27 4107 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 4108 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 4109 cmd->se_lun->unpacked_lun,
4110 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4111
a1d8b49a 4112 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
6708bb27 4113 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 4114 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4115 goto check_cond;
4116 }
a1d8b49a 4117 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 4118 transport_all_task_dev_remove_state(cmd);
a1d8b49a 4119 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4120
4121 transport_free_dev_tasks(cmd);
4122 /*
4123 * The Storage engine stopped this struct se_cmd before it was
4124 * send to the fabric frontend for delivery back to the
4125 * Initiator Node. Return this SCSI CDB back with an
4126 * CHECK_CONDITION status.
4127 */
4128check_cond:
4129 transport_send_check_condition_and_sense(cmd,
4130 TCM_NON_EXISTENT_LUN, 0);
4131 /*
4132 * If the fabric frontend is waiting for this iscsi_cmd_t to
4133 * be released, notify the waiting thread now that LU has
4134 * finished accessing it.
4135 */
a1d8b49a
AG		 4136 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4137 if (atomic_read(&cmd->transport_lun_fe_stop)) {
6708bb27 4138 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 4139 " struct se_cmd: %p ITT: 0x%08x\n",
4140 lun->unpacked_lun,
e3d6f909 4141 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4142
a1d8b49a 4143 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 4144 cmd_flags);
4145 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 4146 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 4147 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4148 continue;
4149 }
6708bb27 4150 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 4151 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4152
a1d8b49a 4153 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4154 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4155 }
4156 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4157}
4158
4159static int transport_clear_lun_thread(void *p)
4160{
4161 struct se_lun *lun = (struct se_lun *)p;
4162
4163 __transport_clear_lun_from_sessions(lun);
4164 complete(&lun->lun_shutdown_comp);
4165
4166 return 0;
4167}
4168
4169int transport_clear_lun_from_sessions(struct se_lun *lun)
4170{
4171 struct task_struct *kt;
4172
5951146d 4173 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 4174 "tcm_cl_%u", lun->unpacked_lun);
4175 if (IS_ERR(kt)) {
6708bb27 4176 pr_err("Unable to start clear_lun thread\n");
e3d6f909 4177 return PTR_ERR(kt);
c66ac9db
NB		 4178 }
4179 wait_for_completion(&lun->lun_shutdown_comp);
4180
4181 return 0;
4182}
4183
d14921d6
NB		 4184/**
4185 * transport_wait_for_tasks - wait for completion to occur
4186 * @cmd: command to wait
c66ac9db 4187 *
d14921d6
NB		 4188 * Called from frontend fabric context to wait for storage engine
4189 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 4190 */
a17f091d 4191bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 4192{
4193 unsigned long flags;
4194
a1d8b49a 4195 spin_lock_irqsave(&cmd->t_state_lock, flags);
d14921d6
NB		 4196 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4197 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4198 return false;
d14921d6
NB		 4199 }
4200 /*
4201 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4202 * has been set in transport_set_supported_SAM_opcode().
4203 */
4204 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4205 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4206 return false;
d14921d6 4207 }
c66ac9db
NB		 4208 /*
4209 * If we are already stopped due to an external event (ie: LUN shutdown)
4210 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 4211 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 4212 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4213 * has completed its operation on the struct se_cmd.
4214 */
a1d8b49a 4215 if (atomic_read(&cmd->transport_lun_stop)) {
c66ac9db 4216
6708bb27 4217 pr_debug("wait_for_tasks: Stopping"
e3d6f909 4218 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 4219 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 4220 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4221 /*
4222 * There is a special case for WRITES where a FE exception +
4223 * LUN shutdown means ConfigFS context is still sleeping on
4224 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4225 * We go ahead and up transport_lun_stop_comp just to be sure
4226 * here.
4227 */
a1d8b49a
AG		 4228 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4229 complete(&cmd->transport_lun_stop_comp);
4230 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4231 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4232
4233 transport_all_task_dev_remove_state(cmd);
4234 /*
4235 * At this point, the frontend who was the originator of this
4236 * struct se_cmd, now owns the structure and can be released through
4237 * normal means below.
4238 */
6708bb27 4239 pr_debug("wait_for_tasks: Stopped"
e3d6f909 4240 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 4241 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 4242 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4243
a1d8b49a 4244 atomic_set(&cmd->transport_lun_stop, 0);
c66ac9db 4245 }
a1d8b49a 4246 if (!atomic_read(&cmd->t_transport_active) ||
d14921d6
NB		 4247 atomic_read(&cmd->t_transport_aborted)) {
4248 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 4249 return false;
d14921d6 4250 }
c66ac9db 4251
a1d8b49a 4252 atomic_set(&cmd->t_transport_stop, 1);
c66ac9db 4253
6708bb27 4254 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
f2da9dbd
CH		 4255 " i_state: %d, t_state: %d, t_transport_stop = TRUE\n",
4256 cmd, cmd->se_tfo->get_task_tag(cmd),
4257 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 4258
a1d8b49a 4259 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4260
5951146d 4261 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 4262
a1d8b49a 4263 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 4264
a1d8b49a
AG		 4265 spin_lock_irqsave(&cmd->t_state_lock, flags);
4266 atomic_set(&cmd->t_transport_active, 0);
4267 atomic_set(&cmd->t_transport_stop, 0);
c66ac9db 4268
6708bb27 4269 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4270 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4271 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4272
d14921d6 4273 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 4274
4275 return true;
c66ac9db 4276}
d14921d6 4277EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 4278
4279static int transport_get_sense_codes(
4280 struct se_cmd *cmd,
4281 u8 *asc,
4282 u8 *ascq)
4283{
4284 *asc = cmd->scsi_asc;
4285 *ascq = cmd->scsi_ascq;
4286
4287 return 0;
4288}
4289
4290static int transport_set_sense_codes(
4291 struct se_cmd *cmd,
4292 u8 asc,
4293 u8 ascq)
4294{
4295 cmd->scsi_asc = asc;
4296 cmd->scsi_ascq = ascq;
4297
4298 return 0;
4299}
4300
4301int transport_send_check_condition_and_sense(
4302 struct se_cmd *cmd,
4303 u8 reason,
4304 int from_transport)
4305{
4306 unsigned char *buffer = cmd->sense_buffer;
4307 unsigned long flags;
4308 int offset;
4309 u8 asc = 0, ascq = 0;
4310
a1d8b49a 4311 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4312 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4313 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4314 return 0;
4315 }
4316 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4317 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4318
4319 if (!reason && from_transport)
4320 goto after_reason;
4321
4322 if (!from_transport)
4323 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4324 /*
4325 * Data Segment and SenseLength of the fabric response PDU.
4326 *
4327 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4328 * from include/scsi/scsi_cmnd.h
4329 */
e3d6f909 4330 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4331 TRANSPORT_SENSE_BUFFER);
4332 /*
4333 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4334 * SENSE KEY values from include/scsi/scsi.h
4335 */
4336 switch (reason) {
4337 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4338 /* CURRENT ERROR */
4339 buffer[offset] = 0x70;
4340 /* ILLEGAL REQUEST */
4341 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4342 /* LOGICAL UNIT NOT SUPPORTED */
4343 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4344 break;
c66ac9db
NB		 4345 case TCM_UNSUPPORTED_SCSI_OPCODE:
4346 case TCM_SECTOR_COUNT_TOO_MANY:
4347 /* CURRENT ERROR */
4348 buffer[offset] = 0x70;
4349 /* ILLEGAL REQUEST */
4350 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4351 /* INVALID COMMAND OPERATION CODE */
4352 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4353 break;
4354 case TCM_UNKNOWN_MODE_PAGE:
4355 /* CURRENT ERROR */
4356 buffer[offset] = 0x70;
4357 /* ILLEGAL REQUEST */
4358 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4359 /* INVALID FIELD IN CDB */
4360 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4361 break;
4362 case TCM_CHECK_CONDITION_ABORT_CMD:
4363 /* CURRENT ERROR */
4364 buffer[offset] = 0x70;
4365 /* ABORTED COMMAND */
4366 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4367 /* BUS DEVICE RESET FUNCTION OCCURRED */
4368 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4369 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4370 break;
4371 case TCM_INCORRECT_AMOUNT_OF_DATA:
4372 /* CURRENT ERROR */
4373 buffer[offset] = 0x70;
4374 /* ABORTED COMMAND */
4375 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4376 /* WRITE ERROR */
4377 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4378 /* NOT ENOUGH UNSOLICITED DATA */
4379 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4380 break;
4381 case TCM_INVALID_CDB_FIELD:
4382 /* CURRENT ERROR */
4383 buffer[offset] = 0x70;
4384 /* ABORTED COMMAND */
4385 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4386 /* INVALID FIELD IN CDB */
4387 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4388 break;
4389 case TCM_INVALID_PARAMETER_LIST:
4390 /* CURRENT ERROR */
4391 buffer[offset] = 0x70;
4392 /* ABORTED COMMAND */
4393 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4394 /* INVALID FIELD IN PARAMETER LIST */
4395 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4396 break;
4397 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4398 /* CURRENT ERROR */
4399 buffer[offset] = 0x70;
4400 /* ABORTED COMMAND */
4401 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4402 /* WRITE ERROR */
4403 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4404 /* UNEXPECTED_UNSOLICITED_DATA */
4405 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4406 break;
4407 case TCM_SERVICE_CRC_ERROR:
4408 /* CURRENT ERROR */
4409 buffer[offset] = 0x70;
4410 /* ABORTED COMMAND */
4411 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4412 /* PROTOCOL SERVICE CRC ERROR */
4413 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4414 /* N/A */
4415 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4416 break;
4417 case TCM_SNACK_REJECTED:
4418 /* CURRENT ERROR */
4419 buffer[offset] = 0x70;
4420 /* ABORTED COMMAND */
4421 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4422 /* READ ERROR */
4423 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4424 /* FAILED RETRANSMISSION REQUEST */
4425 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4426 break;
4427 case TCM_WRITE_PROTECTED:
4428 /* CURRENT ERROR */
4429 buffer[offset] = 0x70;
4430 /* DATA PROTECT */
4431 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4432 /* WRITE PROTECTED */
4433 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4434 break;
4435 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4436 /* CURRENT ERROR */
4437 buffer[offset] = 0x70;
4438 /* UNIT ATTENTION */
4439 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4440 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4441 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4442 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4443 break;
4444 case TCM_CHECK_CONDITION_NOT_READY:
4445 /* CURRENT ERROR */
4446 buffer[offset] = 0x70;
4447 /* Not Ready */
4448 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4449 transport_get_sense_codes(cmd, &asc, &ascq);
4450 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4451 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4452 break;
4453 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4454 default:
4455 /* CURRENT ERROR */
4456 buffer[offset] = 0x70;
4457 /* ILLEGAL REQUEST */
4458 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4459 /* LOGICAL UNIT COMMUNICATION FAILURE */
4460 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4461 break;
4462 }
4463 /*
4464 * This code uses linux/include/scsi/scsi.h SAM status codes!
4465 */
4466 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4467 /*
4468 * Automatically padded, this value is encoded in the fabric's
4469 * data_length response PDU containing the SCSI defined sense data.
4470 */
4471 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4472
4473after_reason:
07bde79a 4474 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4475}
4476EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4477
4478int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4479{
4480 int ret = 0;
4481
a1d8b49a 4482 if (atomic_read(&cmd->t_transport_aborted) != 0) {
6708bb27 4483 if (!send_status ||
c66ac9db
NB		 4484 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4485 return 1;
4486#if 0
6708bb27 4487 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4488 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4489 cmd->t_task_cdb[0],
e3d6f909 4490 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4491#endif
4492 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4493 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4494 ret = 1;
4495 }
4496 return ret;
4497}
4498EXPORT_SYMBOL(transport_check_aborted_status);
4499
4500void transport_send_task_abort(struct se_cmd *cmd)
4501{
c252f003
NB		 4502 unsigned long flags;
4503
4504 spin_lock_irqsave(&cmd->t_state_lock, flags);
4505 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4506 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4507 return;
4508 }
4509 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4510
c66ac9db
NB		 4511 /*
4512 * If there are still expected incoming fabric WRITEs, we wait
4513 * until until they have completed before sending a TASK_ABORTED
4514 * response. This response with TASK_ABORTED status will be
4515 * queued back to fabric module by transport_check_aborted_status().
4516 */
4517 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4518 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
a1d8b49a 4519 atomic_inc(&cmd->t_transport_aborted);
c66ac9db 4520 smp_mb__after_atomic_inc();
c66ac9db
NB		 4521 }
4522 }
4523 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4524#if 0
6708bb27 4525 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4526 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4527 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4528#endif
e3d6f909 4529 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4530}
4531
4532/* transport_generic_do_tmr():
4533 *
4534 *
4535 */
4536int transport_generic_do_tmr(struct se_cmd *cmd)
4537{
5951146d 4538 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4539 struct se_tmr_req *tmr = cmd->se_tmr_req;
4540 int ret;
4541
4542 switch (tmr->function) {
5c6cd613 4543 case TMR_ABORT_TASK:
c66ac9db
NB		 4544 tmr->response = TMR_FUNCTION_REJECTED;
4545 break;
5c6cd613
NB		 4546 case TMR_ABORT_TASK_SET:
4547 case TMR_CLEAR_ACA:
4548 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4549 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4550 break;
5c6cd613 4551 case TMR_LUN_RESET:
c66ac9db
NB		 4552 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4553 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4554 TMR_FUNCTION_REJECTED;
4555 break;
5c6cd613 4556 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4557 tmr->response = TMR_FUNCTION_REJECTED;
4558 break;
5c6cd613 4559 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4560 tmr->response = TMR_FUNCTION_REJECTED;
4561 break;
c66ac9db 4562 default:
6708bb27 4563 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4564 tmr->function);
4565 tmr->response = TMR_FUNCTION_REJECTED;
4566 break;
4567 }
4568
4569 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4570 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 4571
b7b8bef7 4572 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 4573 return 0;
4574}
4575
c66ac9db
NB		 4576/* transport_processing_thread():
4577 *
4578 *
4579 */
4580static int transport_processing_thread(void *param)
4581{
5951146d 4582 int ret;
c66ac9db
NB		 4583 struct se_cmd *cmd;
4584 struct se_device *dev = (struct se_device *) param;
c66ac9db 4585
c66ac9db 4586 while (!kthread_should_stop()) {
e3d6f909
AG		 4587 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4588 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 4589 kthread_should_stop());
4590 if (ret < 0)
4591 goto out;
4592
c66ac9db
NB		 4593get_cmd:
4594 __transport_execute_tasks(dev);
4595
5951146d
AG		 4596 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4597 if (!cmd)
c66ac9db
NB		 4598 continue;
4599
5951146d 4600 switch (cmd->t_state) {
680b73c5
CH		 4601 case TRANSPORT_NEW_CMD:
4602 BUG();
4603 break;
c66ac9db 4604 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 4605 if (!cmd->se_tfo->new_cmd_map) {
4606 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 4607 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4608 BUG();
4609 }
e3d6f909 4610 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db 4611 if (ret < 0) {
03e98c9e 4612 transport_generic_request_failure(cmd);
c66ac9db
NB		 4613 break;
4614 }
c66ac9db 4615 ret = transport_generic_new_cmd(cmd);
f147abb4 4616 if (ret < 0) {
03e98c9e
NB		 4617 transport_generic_request_failure(cmd);
4618 break;
c66ac9db
NB		 4619 }
4620 break;
4621 case TRANSPORT_PROCESS_WRITE:
4622 transport_generic_process_write(cmd);
4623 break;
c66ac9db
NB		 4624 case TRANSPORT_PROCESS_TMR:
4625 transport_generic_do_tmr(cmd);
4626 break;
07bde79a 4627 case TRANSPORT_COMPLETE_QF_WP:
e057f533
CH		 4628 transport_write_pending_qf(cmd);
4629 break;
4630 case TRANSPORT_COMPLETE_QF_OK:
4631 transport_complete_qf(cmd);
07bde79a 4632 break;
c66ac9db 4633 default:
f2da9dbd
CH		 4634 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4635 "i_state: %d on SE LUN: %u\n",
4636 cmd->t_state,
e3d6f909
AG		 4637 cmd->se_tfo->get_task_tag(cmd),
4638 cmd->se_tfo->get_cmd_state(cmd),
4639 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 4640 BUG();
4641 }
4642
4643 goto get_cmd;
4644 }
4645
4646out:
ce8762f6
NB		 4647 WARN_ON(!list_empty(&dev->state_task_list));
4648 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
c66ac9db
NB		 4649 dev->process_thread = NULL;
4650 return 0;
4651}
Linux 6.x block layer and io_uring tree(s)