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target: Remove unneeded version.h includes
[linux-2.6-block.git] / drivers / target / target_core_transport.c
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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>
39#include <asm/unaligned.h>
40#include <net/sock.h>
41#include <net/tcp.h>
42#include <scsi/scsi.h>
43#include <scsi/scsi_cmnd.h>
e66ecd50 44#include <scsi/scsi_tcq.h>
c66ac9db
NB		 45
46#include <target/target_core_base.h>
47#include <target/target_core_device.h>
48#include <target/target_core_tmr.h>
49#include <target/target_core_tpg.h>
50#include <target/target_core_transport.h>
51#include <target/target_core_fabric_ops.h>
52#include <target/target_core_configfs.h>
53
54#include "target_core_alua.h"
55#include "target_core_hba.h"
56#include "target_core_pr.h"
57#include "target_core_scdb.h"
58#include "target_core_ua.h"
59
e3d6f909 60static int sub_api_initialized;
c66ac9db
NB		 61
62static struct kmem_cache *se_cmd_cache;
63static struct kmem_cache *se_sess_cache;
64struct kmem_cache *se_tmr_req_cache;
65struct kmem_cache *se_ua_cache;
c66ac9db
NB		 66struct kmem_cache *t10_pr_reg_cache;
67struct kmem_cache *t10_alua_lu_gp_cache;
68struct kmem_cache *t10_alua_lu_gp_mem_cache;
69struct kmem_cache *t10_alua_tg_pt_gp_cache;
70struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
71
72/* Used for transport_dev_get_map_*() */
73typedef int (*map_func_t)(struct se_task *, u32);
74
75static int transport_generic_write_pending(struct se_cmd *);
5951146d 76static int transport_processing_thread(void *param);
c66ac9db
NB		 77static int __transport_execute_tasks(struct se_device *dev);
78static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a
NB		 79static int transport_complete_qf(struct se_cmd *cmd);
80static void transport_handle_queue_full(struct se_cmd *cmd,
81 struct se_device *dev, int (*qf_callback)(struct se_cmd *));
c66ac9db
NB		 82static void transport_direct_request_timeout(struct se_cmd *cmd);
83static void transport_free_dev_tasks(struct se_cmd *cmd);
a1d8b49a 84static u32 transport_allocate_tasks(struct se_cmd *cmd,
ec98f782 85 unsigned long long starting_lba,
c66ac9db 86 enum dma_data_direction data_direction,
ec98f782 87 struct scatterlist *sgl, unsigned int nents);
05d1c7c0 88static int transport_generic_get_mem(struct se_cmd *cmd);
c66ac9db 89static int transport_generic_remove(struct se_cmd *cmd,
35462975 90 int session_reinstatement);
c66ac9db
NB		 91static void transport_release_fe_cmd(struct se_cmd *cmd);
92static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
93 struct se_queue_obj *qobj);
94static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
95static void transport_stop_all_task_timers(struct se_cmd *cmd);
96
e3d6f909 97int init_se_kmem_caches(void)
c66ac9db 98{
c66ac9db
NB		 99 se_cmd_cache = kmem_cache_create("se_cmd_cache",
100 sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
6708bb27
AG		 101 if (!se_cmd_cache) {
102 pr_err("kmem_cache_create for struct se_cmd failed\n");
c66ac9db
NB		 103 goto out;
104 }
105 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
106 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
107 0, NULL);
6708bb27
AG		 108 if (!se_tmr_req_cache) {
109 pr_err("kmem_cache_create() for struct se_tmr_req"
c66ac9db
NB		 110 " failed\n");
111 goto out;
112 }
113 se_sess_cache = kmem_cache_create("se_sess_cache",
114 sizeof(struct se_session), __alignof__(struct se_session),
115 0, NULL);
6708bb27
AG		 116 if (!se_sess_cache) {
117 pr_err("kmem_cache_create() for struct se_session"
c66ac9db
NB		 118 " failed\n");
119 goto out;
120 }
121 se_ua_cache = kmem_cache_create("se_ua_cache",
122 sizeof(struct se_ua), __alignof__(struct se_ua),
123 0, NULL);
6708bb27
AG		 124 if (!se_ua_cache) {
125 pr_err("kmem_cache_create() for struct se_ua failed\n");
c66ac9db
NB		 126 goto out;
127 }
c66ac9db
NB		 128 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
129 sizeof(struct t10_pr_registration),
130 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 131 if (!t10_pr_reg_cache) {
132 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db
NB		 133 " failed\n");
134 goto out;
135 }
136 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
137 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
138 0, NULL);
6708bb27
AG		 139 if (!t10_alua_lu_gp_cache) {
140 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db
NB		 141 " failed\n");
142 goto out;
143 }
144 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
145 sizeof(struct t10_alua_lu_gp_member),
146 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 147 if (!t10_alua_lu_gp_mem_cache) {
148 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db
NB		 149 "cache failed\n");
150 goto out;
151 }
152 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
153 sizeof(struct t10_alua_tg_pt_gp),
154 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 155 if (!t10_alua_tg_pt_gp_cache) {
156 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db
NB		 157 "cache failed\n");
158 goto out;
159 }
160 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
161 "t10_alua_tg_pt_gp_mem_cache",
162 sizeof(struct t10_alua_tg_pt_gp_member),
163 __alignof__(struct t10_alua_tg_pt_gp_member),
164 0, NULL);
6708bb27
AG		 165 if (!t10_alua_tg_pt_gp_mem_cache) {
166 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db
NB		 167 "mem_t failed\n");
168 goto out;
169 }
170
c66ac9db
NB		 171 return 0;
172out:
173 if (se_cmd_cache)
174 kmem_cache_destroy(se_cmd_cache);
175 if (se_tmr_req_cache)
176 kmem_cache_destroy(se_tmr_req_cache);
177 if (se_sess_cache)
178 kmem_cache_destroy(se_sess_cache);
179 if (se_ua_cache)
180 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 181 if (t10_pr_reg_cache)
182 kmem_cache_destroy(t10_pr_reg_cache);
183 if (t10_alua_lu_gp_cache)
184 kmem_cache_destroy(t10_alua_lu_gp_cache);
185 if (t10_alua_lu_gp_mem_cache)
186 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
187 if (t10_alua_tg_pt_gp_cache)
188 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
189 if (t10_alua_tg_pt_gp_mem_cache)
190 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
e3d6f909 191 return -ENOMEM;
c66ac9db
NB		 192}
193
e3d6f909 194void release_se_kmem_caches(void)
c66ac9db 195{
c66ac9db
NB		 196 kmem_cache_destroy(se_cmd_cache);
197 kmem_cache_destroy(se_tmr_req_cache);
198 kmem_cache_destroy(se_sess_cache);
199 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 200 kmem_cache_destroy(t10_pr_reg_cache);
201 kmem_cache_destroy(t10_alua_lu_gp_cache);
202 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
203 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
204 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 205}
206
e3d6f909
AG		 207/* This code ensures unique mib indexes are handed out. */
208static DEFINE_SPINLOCK(scsi_mib_index_lock);
209static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 210
211/*
212 * Allocate a new row index for the entry type specified
213 */
214u32 scsi_get_new_index(scsi_index_t type)
215{
216 u32 new_index;
217
e3d6f909 218 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 219
e3d6f909
AG		 220 spin_lock(&scsi_mib_index_lock);
221 new_index = ++scsi_mib_index[type];
222 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 223
224 return new_index;
225}
226
c66ac9db
NB		 227void transport_init_queue_obj(struct se_queue_obj *qobj)
228{
229 atomic_set(&qobj->queue_cnt, 0);
230 INIT_LIST_HEAD(&qobj->qobj_list);
231 init_waitqueue_head(&qobj->thread_wq);
232 spin_lock_init(&qobj->cmd_queue_lock);
233}
234EXPORT_SYMBOL(transport_init_queue_obj);
235
236static int transport_subsystem_reqmods(void)
237{
238 int ret;
239
240 ret = request_module("target_core_iblock");
241 if (ret != 0)
6708bb27 242 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 243
244 ret = request_module("target_core_file");
245 if (ret != 0)
6708bb27 246 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 247
248 ret = request_module("target_core_pscsi");
249 if (ret != 0)
6708bb27 250 pr_err("Unable to load target_core_pscsi\n");
c66ac9db
NB		 251
252 ret = request_module("target_core_stgt");
253 if (ret != 0)
6708bb27 254 pr_err("Unable to load target_core_stgt\n");
c66ac9db
NB		 255
256 return 0;
257}
258
259int transport_subsystem_check_init(void)
260{
e3d6f909
AG		 261 int ret;
262
263 if (sub_api_initialized)
c66ac9db
NB		 264 return 0;
265 /*
266 * Request the loading of known TCM subsystem plugins..
267 */
e3d6f909
AG		 268 ret = transport_subsystem_reqmods();
269 if (ret < 0)
270 return ret;
c66ac9db 271
e3d6f909 272 sub_api_initialized = 1;
c66ac9db
NB		 273 return 0;
274}
275
276struct se_session *transport_init_session(void)
277{
278 struct se_session *se_sess;
279
280 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 281 if (!se_sess) {
282 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 283 " se_sess_cache\n");
284 return ERR_PTR(-ENOMEM);
285 }
286 INIT_LIST_HEAD(&se_sess->sess_list);
287 INIT_LIST_HEAD(&se_sess->sess_acl_list);
c66ac9db
NB		 288
289 return se_sess;
290}
291EXPORT_SYMBOL(transport_init_session);
292
293/*
294 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
295 */
296void __transport_register_session(
297 struct se_portal_group *se_tpg,
298 struct se_node_acl *se_nacl,
299 struct se_session *se_sess,
300 void *fabric_sess_ptr)
301{
302 unsigned char buf[PR_REG_ISID_LEN];
303
304 se_sess->se_tpg = se_tpg;
305 se_sess->fabric_sess_ptr = fabric_sess_ptr;
306 /*
307 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
308 *
309 * Only set for struct se_session's that will actually be moving I/O.
310 * eg: *NOT* discovery sessions.
311 */
312 if (se_nacl) {
313 /*
314 * If the fabric module supports an ISID based TransportID,
315 * save this value in binary from the fabric I_T Nexus now.
316 */
e3d6f909 317 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 318 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 319 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 320 &buf[0], PR_REG_ISID_LEN);
321 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
322 }
323 spin_lock_irq(&se_nacl->nacl_sess_lock);
324 /*
325 * The se_nacl->nacl_sess pointer will be set to the
326 * last active I_T Nexus for each struct se_node_acl.
327 */
328 se_nacl->nacl_sess = se_sess;
329
330 list_add_tail(&se_sess->sess_acl_list,
331 &se_nacl->acl_sess_list);
332 spin_unlock_irq(&se_nacl->nacl_sess_lock);
333 }
334 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
335
6708bb27 336 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 337 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 338}
339EXPORT_SYMBOL(__transport_register_session);
340
341void transport_register_session(
342 struct se_portal_group *se_tpg,
343 struct se_node_acl *se_nacl,
344 struct se_session *se_sess,
345 void *fabric_sess_ptr)
346{
347 spin_lock_bh(&se_tpg->session_lock);
348 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
349 spin_unlock_bh(&se_tpg->session_lock);
350}
351EXPORT_SYMBOL(transport_register_session);
352
353void transport_deregister_session_configfs(struct se_session *se_sess)
354{
355 struct se_node_acl *se_nacl;
23388864 356 unsigned long flags;
c66ac9db
NB		 357 /*
358 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
359 */
360 se_nacl = se_sess->se_node_acl;
6708bb27 361 if (se_nacl) {
23388864 362 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 363 list_del(&se_sess->sess_acl_list);
364 /*
365 * If the session list is empty, then clear the pointer.
366 * Otherwise, set the struct se_session pointer from the tail
367 * element of the per struct se_node_acl active session list.
368 */
369 if (list_empty(&se_nacl->acl_sess_list))
370 se_nacl->nacl_sess = NULL;
371 else {
372 se_nacl->nacl_sess = container_of(
373 se_nacl->acl_sess_list.prev,
374 struct se_session, sess_acl_list);
375 }
23388864 376 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 377 }
378}
379EXPORT_SYMBOL(transport_deregister_session_configfs);
380
381void transport_free_session(struct se_session *se_sess)
382{
383 kmem_cache_free(se_sess_cache, se_sess);
384}
385EXPORT_SYMBOL(transport_free_session);
386
387void transport_deregister_session(struct se_session *se_sess)
388{
389 struct se_portal_group *se_tpg = se_sess->se_tpg;
390 struct se_node_acl *se_nacl;
e63a8e19 391 unsigned long flags;
c66ac9db 392
6708bb27 393 if (!se_tpg) {
c66ac9db
NB		 394 transport_free_session(se_sess);
395 return;
396 }
c66ac9db 397
e63a8e19 398 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 399 list_del(&se_sess->sess_list);
400 se_sess->se_tpg = NULL;
401 se_sess->fabric_sess_ptr = NULL;
e63a8e19 402 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 403
404 /*
405 * Determine if we need to do extra work for this initiator node's
406 * struct se_node_acl if it had been previously dynamically generated.
407 */
408 se_nacl = se_sess->se_node_acl;
6708bb27 409 if (se_nacl) {
e63a8e19 410 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 411 if (se_nacl->dynamic_node_acl) {
6708bb27
AG		 412 if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
413 se_tpg)) {
c66ac9db
NB		 414 list_del(&se_nacl->acl_list);
415 se_tpg->num_node_acls--;
e63a8e19 416 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 417
418 core_tpg_wait_for_nacl_pr_ref(se_nacl);
c66ac9db 419 core_free_device_list_for_node(se_nacl, se_tpg);
e3d6f909 420 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
c66ac9db 421 se_nacl);
e63a8e19 422 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 423 }
424 }
e63a8e19 425 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 426 }
427
428 transport_free_session(se_sess);
429
6708bb27 430 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 431 se_tpg->se_tpg_tfo->get_fabric_name());
c66ac9db
NB		 432}
433EXPORT_SYMBOL(transport_deregister_session);
434
435/*
a1d8b49a 436 * Called with cmd->t_state_lock held.
c66ac9db
NB		 437 */
438static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
439{
440 struct se_device *dev;
441 struct se_task *task;
442 unsigned long flags;
443
a1d8b49a 444 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db 445 dev = task->se_dev;
6708bb27 446 if (!dev)
c66ac9db
NB		 447 continue;
448
449 if (atomic_read(&task->task_active))
450 continue;
451
6708bb27 452 if (!atomic_read(&task->task_state_active))
c66ac9db
NB		 453 continue;
454
455 spin_lock_irqsave(&dev->execute_task_lock, flags);
456 list_del(&task->t_state_list);
6708bb27
AG		 457 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
458 cmd->se_tfo->get_task_tag(cmd), dev, task);
c66ac9db
NB		 459 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
460
461 atomic_set(&task->task_state_active, 0);
a1d8b49a 462 atomic_dec(&cmd->t_task_cdbs_ex_left);
c66ac9db
NB		 463 }
464}
465
466/* transport_cmd_check_stop():
467 *
468 * 'transport_off = 1' determines if t_transport_active should be cleared.
469 * 'transport_off = 2' determines if task_dev_state should be removed.
470 *
471 * A non-zero u8 t_state sets cmd->t_state.
472 * Returns 1 when command is stopped, else 0.
473 */
474static int transport_cmd_check_stop(
475 struct se_cmd *cmd,
476 int transport_off,
477 u8 t_state)
478{
479 unsigned long flags;
480
a1d8b49a 481 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 482 /*
483 * Determine if IOCTL context caller in requesting the stopping of this
484 * command for LUN shutdown purposes.
485 */
a1d8b49a 486 if (atomic_read(&cmd->transport_lun_stop)) {
6708bb27 487 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
c66ac9db 488 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 489 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 490
491 cmd->deferred_t_state = cmd->t_state;
492 cmd->t_state = TRANSPORT_DEFERRED_CMD;
a1d8b49a 493 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 494 if (transport_off == 2)
495 transport_all_task_dev_remove_state(cmd);
a1d8b49a 496 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 497
a1d8b49a 498 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 499 return 1;
500 }
501 /*
502 * Determine if frontend context caller is requesting the stopping of
e3d6f909 503 * this command for frontend exceptions.
c66ac9db 504 */
a1d8b49a 505 if (atomic_read(&cmd->t_transport_stop)) {
6708bb27 506 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
c66ac9db 507 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 508 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 509
510 cmd->deferred_t_state = cmd->t_state;
511 cmd->t_state = TRANSPORT_DEFERRED_CMD;
512 if (transport_off == 2)
513 transport_all_task_dev_remove_state(cmd);
514
515 /*
516 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
517 * to FE.
518 */
519 if (transport_off == 2)
520 cmd->se_lun = NULL;
a1d8b49a 521 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 522
a1d8b49a 523 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 524 return 1;
525 }
526 if (transport_off) {
a1d8b49a 527 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 528 if (transport_off == 2) {
529 transport_all_task_dev_remove_state(cmd);
530 /*
531 * Clear struct se_cmd->se_lun before the transport_off == 2
532 * handoff to fabric module.
533 */
534 cmd->se_lun = NULL;
535 /*
536 * Some fabric modules like tcm_loop can release
25985edc 537 * their internally allocated I/O reference now and
c66ac9db
NB		 538 * struct se_cmd now.
539 */
e3d6f909 540 if (cmd->se_tfo->check_stop_free != NULL) {
c66ac9db 541 spin_unlock_irqrestore(
a1d8b49a 542 &cmd->t_state_lock, flags);
c66ac9db 543
e3d6f909 544 cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 545 return 1;
546 }
547 }
a1d8b49a 548 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 549
550 return 0;
551 } else if (t_state)
552 cmd->t_state = t_state;
a1d8b49a 553 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 554
555 return 0;
556}
557
558static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
559{
560 return transport_cmd_check_stop(cmd, 2, 0);
561}
562
563static void transport_lun_remove_cmd(struct se_cmd *cmd)
564{
e3d6f909 565 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 566 unsigned long flags;
567
568 if (!lun)
569 return;
570
a1d8b49a 571 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 572 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 573 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 574 goto check_lun;
575 }
a1d8b49a 576 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 577 transport_all_task_dev_remove_state(cmd);
a1d8b49a 578 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 579
c66ac9db
NB		 580
581check_lun:
582 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
a1d8b49a 583 if (atomic_read(&cmd->transport_lun_active)) {
5951146d 584 list_del(&cmd->se_lun_node);
a1d8b49a 585 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db 586#if 0
6708bb27 587 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
e3d6f909 588 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
c66ac9db
NB		 589#endif
590 }
591 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
592}
593
594void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
595{
5951146d 596 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 597 transport_lun_remove_cmd(cmd);
598
599 if (transport_cmd_check_stop_to_fabric(cmd))
600 return;
601 if (remove)
35462975 602 transport_generic_remove(cmd, 0);
c66ac9db
NB		 603}
604
605void transport_cmd_finish_abort_tmr(struct se_cmd *cmd)
606{
5951146d 607 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 608
609 if (transport_cmd_check_stop_to_fabric(cmd))
610 return;
611
35462975 612 transport_generic_remove(cmd, 0);
c66ac9db
NB		 613}
614
5951146d 615static void transport_add_cmd_to_queue(
c66ac9db
NB		 616 struct se_cmd *cmd,
617 int t_state)
618{
619 struct se_device *dev = cmd->se_dev;
e3d6f909 620 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 621 unsigned long flags;
622
5951146d 623 INIT_LIST_HEAD(&cmd->se_queue_node);
c66ac9db
NB		 624
625 if (t_state) {
a1d8b49a 626 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 627 cmd->t_state = t_state;
a1d8b49a
AG		 628 atomic_set(&cmd->t_transport_active, 1);
629 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 630 }
631
632 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
07bde79a
NB		 633 if (cmd->se_cmd_flags & SCF_EMULATE_QUEUE_FULL) {
634 cmd->se_cmd_flags &= ~SCF_EMULATE_QUEUE_FULL;
635 list_add(&cmd->se_queue_node, &qobj->qobj_list);
636 } else
637 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
a1d8b49a 638 atomic_inc(&cmd->t_transport_queue_active);
c66ac9db
NB		 639 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
640
641 atomic_inc(&qobj->queue_cnt);
642 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 643}
644
5951146d
AG		 645static struct se_cmd *
646transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 647{
5951146d 648 struct se_cmd *cmd;
c66ac9db
NB		 649 unsigned long flags;
650
651 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
652 if (list_empty(&qobj->qobj_list)) {
653 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
654 return NULL;
655 }
5951146d 656 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 657
a1d8b49a 658 atomic_dec(&cmd->t_transport_queue_active);
c66ac9db 659
5951146d 660 list_del(&cmd->se_queue_node);
c66ac9db
NB		 661 atomic_dec(&qobj->queue_cnt);
662 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
663
5951146d 664 return cmd;
c66ac9db
NB		 665}
666
667static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
668 struct se_queue_obj *qobj)
669{
5951146d 670 struct se_cmd *t;
c66ac9db
NB		 671 unsigned long flags;
672
673 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
6708bb27 674 if (!atomic_read(&cmd->t_transport_queue_active)) {
c66ac9db
NB		 675 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
676 return;
677 }
678
5951146d
AG		 679 list_for_each_entry(t, &qobj->qobj_list, se_queue_node)
680 if (t == cmd) {
a1d8b49a 681 atomic_dec(&cmd->t_transport_queue_active);
5951146d
AG		 682 atomic_dec(&qobj->queue_cnt);
683 list_del(&cmd->se_queue_node);
684 break;
685 }
c66ac9db
NB		 686 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
687
a1d8b49a 688 if (atomic_read(&cmd->t_transport_queue_active)) {
6708bb27 689 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
e3d6f909 690 cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 691 atomic_read(&cmd->t_transport_queue_active));
c66ac9db
NB		 692 }
693}
694
695/*
696 * Completion function used by TCM subsystem plugins (such as FILEIO)
697 * for queueing up response from struct se_subsystem_api->do_task()
698 */
699void transport_complete_sync_cache(struct se_cmd *cmd, int good)
700{
a1d8b49a 701 struct se_task *task = list_entry(cmd->t_task_list.next,
c66ac9db
NB		 702 struct se_task, t_list);
703
704 if (good) {
705 cmd->scsi_status = SAM_STAT_GOOD;
706 task->task_scsi_status = GOOD;
707 } else {
708 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
709 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
e3d6f909 710 task->task_se_cmd->transport_error_status =
c66ac9db
NB		 711 PYX_TRANSPORT_ILLEGAL_REQUEST;
712 }
713
714 transport_complete_task(task, good);
715}
716EXPORT_SYMBOL(transport_complete_sync_cache);
717
718/* transport_complete_task():
719 *
720 * Called from interrupt and non interrupt context depending
721 * on the transport plugin.
722 */
723void transport_complete_task(struct se_task *task, int success)
724{
e3d6f909 725 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db
NB		 726 struct se_device *dev = task->se_dev;
727 int t_state;
728 unsigned long flags;
729#if 0
6708bb27 730 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
a1d8b49a 731 cmd->t_task_cdb[0], dev);
c66ac9db 732#endif
e3d6f909 733 if (dev)
c66ac9db 734 atomic_inc(&dev->depth_left);
c66ac9db 735
a1d8b49a 736 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 737 atomic_set(&task->task_active, 0);
738
739 /*
740 * See if any sense data exists, if so set the TASK_SENSE flag.
741 * Also check for any other post completion work that needs to be
742 * done by the plugins.
743 */
744 if (dev && dev->transport->transport_complete) {
745 if (dev->transport->transport_complete(task) != 0) {
746 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
747 task->task_sense = 1;
748 success = 1;
749 }
750 }
751
752 /*
753 * See if we are waiting for outstanding struct se_task
754 * to complete for an exception condition
755 */
756 if (atomic_read(&task->task_stop)) {
757 /*
a1d8b49a 758 * Decrement cmd->t_se_count if this task had
c66ac9db
NB		 759 * previously thrown its timeout exception handler.
760 */
761 if (atomic_read(&task->task_timeout)) {
a1d8b49a 762 atomic_dec(&cmd->t_se_count);
c66ac9db
NB		 763 atomic_set(&task->task_timeout, 0);
764 }
a1d8b49a 765 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 766
767 complete(&task->task_stop_comp);
768 return;
769 }
770 /*
771 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
772 * left counter to determine when the struct se_cmd is ready to be queued to
773 * the processing thread.
774 */
775 if (atomic_read(&task->task_timeout)) {
6708bb27
AG		 776 if (!atomic_dec_and_test(
777 &cmd->t_task_cdbs_timeout_left)) {
a1d8b49a 778 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 779 flags);
780 return;
781 }
782 t_state = TRANSPORT_COMPLETE_TIMEOUT;
a1d8b49a 783 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 784
785 transport_add_cmd_to_queue(cmd, t_state);
786 return;
787 }
a1d8b49a 788 atomic_dec(&cmd->t_task_cdbs_timeout_left);
c66ac9db
NB		 789
790 /*
791 * Decrement the outstanding t_task_cdbs_left count. The last
792 * struct se_task from struct se_cmd will complete itself into the
793 * device queue depending upon int success.
794 */
6708bb27 795 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
c66ac9db 796 if (!success)
a1d8b49a 797 cmd->t_tasks_failed = 1;
c66ac9db 798
a1d8b49a 799 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 800 return;
801 }
802
a1d8b49a 803 if (!success || cmd->t_tasks_failed) {
c66ac9db
NB		 804 t_state = TRANSPORT_COMPLETE_FAILURE;
805 if (!task->task_error_status) {
806 task->task_error_status =
807 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
808 cmd->transport_error_status =
809 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
810 }
811 } else {
a1d8b49a 812 atomic_set(&cmd->t_transport_complete, 1);
c66ac9db
NB		 813 t_state = TRANSPORT_COMPLETE_OK;
814 }
a1d8b49a 815 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 816
817 transport_add_cmd_to_queue(cmd, t_state);
818}
819EXPORT_SYMBOL(transport_complete_task);
820
821/*
822 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
823 * struct se_task list are ready to be added to the active execution list
824 * struct se_device
825
826 * Called with se_dev_t->execute_task_lock called.
827 */
828static inline int transport_add_task_check_sam_attr(
829 struct se_task *task,
830 struct se_task *task_prev,
831 struct se_device *dev)
832{
833 /*
834 * No SAM Task attribute emulation enabled, add to tail of
835 * execution queue
836 */
837 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
838 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
839 return 0;
840 }
841 /*
842 * HEAD_OF_QUEUE attribute for received CDB, which means
843 * the first task that is associated with a struct se_cmd goes to
844 * head of the struct se_device->execute_task_list, and task_prev
845 * after that for each subsequent task
846 */
e66ecd50 847 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 848 list_add(&task->t_execute_list,
849 (task_prev != NULL) ?
850 &task_prev->t_execute_list :
851 &dev->execute_task_list);
852
6708bb27 853 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
c66ac9db 854 " in execution queue\n",
6708bb27 855 task->task_se_cmd->t_task_cdb[0]);
c66ac9db
NB		 856 return 1;
857 }
858 /*
859 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
860 * transitioned from Dermant -> Active state, and are added to the end
861 * of the struct se_device->execute_task_list
862 */
863 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
864 return 0;
865}
866
867/* __transport_add_task_to_execute_queue():
868 *
869 * Called with se_dev_t->execute_task_lock called.
870 */
871static void __transport_add_task_to_execute_queue(
872 struct se_task *task,
873 struct se_task *task_prev,
874 struct se_device *dev)
875{
876 int head_of_queue;
877
878 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
879 atomic_inc(&dev->execute_tasks);
880
881 if (atomic_read(&task->task_state_active))
882 return;
883 /*
884 * Determine if this task needs to go to HEAD_OF_QUEUE for the
885 * state list as well. Running with SAM Task Attribute emulation
886 * will always return head_of_queue == 0 here
887 */
888 if (head_of_queue)
889 list_add(&task->t_state_list, (task_prev) ?
890 &task_prev->t_state_list :
891 &dev->state_task_list);
892 else
893 list_add_tail(&task->t_state_list, &dev->state_task_list);
894
895 atomic_set(&task->task_state_active, 1);
896
6708bb27 897 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
e3d6f909 898 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
c66ac9db
NB		 899 task, dev);
900}
901
902static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
903{
904 struct se_device *dev;
905 struct se_task *task;
906 unsigned long flags;
907
a1d8b49a
AG		 908 spin_lock_irqsave(&cmd->t_state_lock, flags);
909 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 910 dev = task->se_dev;
911
912 if (atomic_read(&task->task_state_active))
913 continue;
914
915 spin_lock(&dev->execute_task_lock);
916 list_add_tail(&task->t_state_list, &dev->state_task_list);
917 atomic_set(&task->task_state_active, 1);
918
6708bb27
AG		 919 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
920 task->task_se_cmd->se_tfo->get_task_tag(
c66ac9db
NB		 921 task->task_se_cmd), task, dev);
922
923 spin_unlock(&dev->execute_task_lock);
924 }
a1d8b49a 925 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 926}
927
928static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
929{
5951146d 930 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 931 struct se_task *task, *task_prev = NULL;
932 unsigned long flags;
933
934 spin_lock_irqsave(&dev->execute_task_lock, flags);
a1d8b49a 935 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 936 if (atomic_read(&task->task_execute_queue))
937 continue;
938 /*
939 * __transport_add_task_to_execute_queue() handles the
940 * SAM Task Attribute emulation if enabled
941 */
942 __transport_add_task_to_execute_queue(task, task_prev, dev);
943 atomic_set(&task->task_execute_queue, 1);
944 task_prev = task;
945 }
946 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 947}
948
949/* transport_remove_task_from_execute_queue():
950 *
951 *
952 */
52208ae3 953void transport_remove_task_from_execute_queue(
c66ac9db
NB		 954 struct se_task *task,
955 struct se_device *dev)
956{
957 unsigned long flags;
958
af57c3ac
NB		 959 if (atomic_read(&task->task_execute_queue) == 0) {
960 dump_stack();
961 return;
962 }
963
c66ac9db
NB		 964 spin_lock_irqsave(&dev->execute_task_lock, flags);
965 list_del(&task->t_execute_list);
af57c3ac 966 atomic_set(&task->task_execute_queue, 0);
c66ac9db
NB		 967 atomic_dec(&dev->execute_tasks);
968 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
969}
970
07bde79a
NB		 971/*
972 * Handle QUEUE_FULL / -EAGAIN status
973 */
974
975static void target_qf_do_work(struct work_struct *work)
976{
977 struct se_device *dev = container_of(work, struct se_device,
978 qf_work_queue);
bcac364a 979 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 980 struct se_cmd *cmd, *cmd_tmp;
981
982 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 983 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
984 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 985
bcac364a 986 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 987 list_del(&cmd->se_qf_node);
988 atomic_dec(&dev->dev_qf_count);
989 smp_mb__after_atomic_dec();
07bde79a 990
6708bb27 991 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a
NB		 992 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
993 (cmd->t_state == TRANSPORT_COMPLETE_OK) ? "COMPLETE_OK" :
994 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
995 : "UNKNOWN");
996 /*
997 * The SCF_EMULATE_QUEUE_FULL flag will be cleared once se_cmd
998 * has been added to head of queue
999 */
1000 transport_add_cmd_to_queue(cmd, cmd->t_state);
07bde79a 1001 }
07bde79a
NB		 1002}
1003
c66ac9db
NB		 1004unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
1005{
1006 switch (cmd->data_direction) {
1007 case DMA_NONE:
1008 return "NONE";
1009 case DMA_FROM_DEVICE:
1010 return "READ";
1011 case DMA_TO_DEVICE:
1012 return "WRITE";
1013 case DMA_BIDIRECTIONAL:
1014 return "BIDI";
1015 default:
1016 break;
1017 }
1018
1019 return "UNKNOWN";
1020}
1021
1022void transport_dump_dev_state(
1023 struct se_device *dev,
1024 char *b,
1025 int *bl)
1026{
1027 *bl += sprintf(b + *bl, "Status: ");
1028 switch (dev->dev_status) {
1029 case TRANSPORT_DEVICE_ACTIVATED:
1030 *bl += sprintf(b + *bl, "ACTIVATED");
1031 break;
1032 case TRANSPORT_DEVICE_DEACTIVATED:
1033 *bl += sprintf(b + *bl, "DEACTIVATED");
1034 break;
1035 case TRANSPORT_DEVICE_SHUTDOWN:
1036 *bl += sprintf(b + *bl, "SHUTDOWN");
1037 break;
1038 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
1039 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
1040 *bl += sprintf(b + *bl, "OFFLINE");
1041 break;
1042 default:
1043 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
1044 break;
1045 }
1046
1047 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
1048 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
1049 dev->queue_depth);
1050 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
e3d6f909 1051 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db
NB		 1052 *bl += sprintf(b + *bl, " ");
1053}
1054
1055/* transport_release_all_cmds():
1056 *
1057 *
1058 */
1059static void transport_release_all_cmds(struct se_device *dev)
1060{
5951146d 1061 struct se_cmd *cmd, *tcmd;
c66ac9db
NB		 1062 int bug_out = 0, t_state;
1063 unsigned long flags;
1064
e3d6f909 1065 spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
5951146d
AG		 1066 list_for_each_entry_safe(cmd, tcmd, &dev->dev_queue_obj.qobj_list,
1067 se_queue_node) {
1068 t_state = cmd->t_state;
1069 list_del(&cmd->se_queue_node);
e3d6f909 1070 spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock,
c66ac9db
NB		 1071 flags);
1072
6708bb27 1073 pr_err("Releasing ITT: 0x%08x, i_state: %u,"
c66ac9db 1074 " t_state: %u directly\n",
e3d6f909
AG		 1075 cmd->se_tfo->get_task_tag(cmd),
1076 cmd->se_tfo->get_cmd_state(cmd), t_state);
c66ac9db
NB		 1077
1078 transport_release_fe_cmd(cmd);
1079 bug_out = 1;
1080
e3d6f909 1081 spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
c66ac9db 1082 }
e3d6f909 1083 spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock, flags);
c66ac9db
NB		 1084#if 0
1085 if (bug_out)
1086 BUG();
1087#endif
1088}
1089
1090void transport_dump_vpd_proto_id(
1091 struct t10_vpd *vpd,
1092 unsigned char *p_buf,
1093 int p_buf_len)
1094{
1095 unsigned char buf[VPD_TMP_BUF_SIZE];
1096 int len;
1097
1098 memset(buf, 0, VPD_TMP_BUF_SIZE);
1099 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1100
1101 switch (vpd->protocol_identifier) {
1102 case 0x00:
1103 sprintf(buf+len, "Fibre Channel\n");
1104 break;
1105 case 0x10:
1106 sprintf(buf+len, "Parallel SCSI\n");
1107 break;
1108 case 0x20:
1109 sprintf(buf+len, "SSA\n");
1110 break;
1111 case 0x30:
1112 sprintf(buf+len, "IEEE 1394\n");
1113 break;
1114 case 0x40:
1115 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1116 " Protocol\n");
1117 break;
1118 case 0x50:
1119 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1120 break;
1121 case 0x60:
1122 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1123 break;
1124 case 0x70:
1125 sprintf(buf+len, "Automation/Drive Interface Transport"
1126 " Protocol\n");
1127 break;
1128 case 0x80:
1129 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1130 break;
1131 default:
1132 sprintf(buf+len, "Unknown 0x%02x\n",
1133 vpd->protocol_identifier);
1134 break;
1135 }
1136
1137 if (p_buf)
1138 strncpy(p_buf, buf, p_buf_len);
1139 else
6708bb27 1140 pr_debug("%s", buf);
c66ac9db
NB		 1141}
1142
1143void
1144transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1145{
1146 /*
1147 * Check if the Protocol Identifier Valid (PIV) bit is set..
1148 *
1149 * from spc3r23.pdf section 7.5.1
1150 */
1151 if (page_83[1] & 0x80) {
1152 vpd->protocol_identifier = (page_83[0] & 0xf0);
1153 vpd->protocol_identifier_set = 1;
1154 transport_dump_vpd_proto_id(vpd, NULL, 0);
1155 }
1156}
1157EXPORT_SYMBOL(transport_set_vpd_proto_id);
1158
1159int transport_dump_vpd_assoc(
1160 struct t10_vpd *vpd,
1161 unsigned char *p_buf,
1162 int p_buf_len)
1163{
1164 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1165 int ret = 0;
1166 int len;
c66ac9db
NB		 1167
1168 memset(buf, 0, VPD_TMP_BUF_SIZE);
1169 len = sprintf(buf, "T10 VPD Identifier Association: ");
1170
1171 switch (vpd->association) {
1172 case 0x00:
1173 sprintf(buf+len, "addressed logical unit\n");
1174 break;
1175 case 0x10:
1176 sprintf(buf+len, "target port\n");
1177 break;
1178 case 0x20:
1179 sprintf(buf+len, "SCSI target device\n");
1180 break;
1181 default:
1182 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 1183 ret = -EINVAL;
c66ac9db
NB		 1184 break;
1185 }
1186
1187 if (p_buf)
1188 strncpy(p_buf, buf, p_buf_len);
1189 else
6708bb27 1190 pr_debug("%s", buf);
c66ac9db
NB		 1191
1192 return ret;
1193}
1194
1195int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1196{
1197 /*
1198 * The VPD identification association..
1199 *
1200 * from spc3r23.pdf Section 7.6.3.1 Table 297
1201 */
1202 vpd->association = (page_83[1] & 0x30);
1203 return transport_dump_vpd_assoc(vpd, NULL, 0);
1204}
1205EXPORT_SYMBOL(transport_set_vpd_assoc);
1206
1207int transport_dump_vpd_ident_type(
1208 struct t10_vpd *vpd,
1209 unsigned char *p_buf,
1210 int p_buf_len)
1211{
1212 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1213 int ret = 0;
1214 int len;
c66ac9db
NB		 1215
1216 memset(buf, 0, VPD_TMP_BUF_SIZE);
1217 len = sprintf(buf, "T10 VPD Identifier Type: ");
1218
1219 switch (vpd->device_identifier_type) {
1220 case 0x00:
1221 sprintf(buf+len, "Vendor specific\n");
1222 break;
1223 case 0x01:
1224 sprintf(buf+len, "T10 Vendor ID based\n");
1225 break;
1226 case 0x02:
1227 sprintf(buf+len, "EUI-64 based\n");
1228 break;
1229 case 0x03:
1230 sprintf(buf+len, "NAA\n");
1231 break;
1232 case 0x04:
1233 sprintf(buf+len, "Relative target port identifier\n");
1234 break;
1235 case 0x08:
1236 sprintf(buf+len, "SCSI name string\n");
1237 break;
1238 default:
1239 sprintf(buf+len, "Unsupported: 0x%02x\n",
1240 vpd->device_identifier_type);
e3d6f909 1241 ret = -EINVAL;
c66ac9db
NB		 1242 break;
1243 }
1244
e3d6f909
AG		 1245 if (p_buf) {
1246 if (p_buf_len < strlen(buf)+1)
1247 return -EINVAL;
c66ac9db 1248 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1249 } else {
6708bb27 1250 pr_debug("%s", buf);
e3d6f909 1251 }
c66ac9db
NB		 1252
1253 return ret;
1254}
1255
1256int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1257{
1258 /*
1259 * The VPD identifier type..
1260 *
1261 * from spc3r23.pdf Section 7.6.3.1 Table 298
1262 */
1263 vpd->device_identifier_type = (page_83[1] & 0x0f);
1264 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1265}
1266EXPORT_SYMBOL(transport_set_vpd_ident_type);
1267
1268int transport_dump_vpd_ident(
1269 struct t10_vpd *vpd,
1270 unsigned char *p_buf,
1271 int p_buf_len)
1272{
1273 unsigned char buf[VPD_TMP_BUF_SIZE];
1274 int ret = 0;
1275
1276 memset(buf, 0, VPD_TMP_BUF_SIZE);
1277
1278 switch (vpd->device_identifier_code_set) {
1279 case 0x01: /* Binary */
1280 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1281 &vpd->device_identifier[0]);
1282 break;
1283 case 0x02: /* ASCII */
1284 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1285 &vpd->device_identifier[0]);
1286 break;
1287 case 0x03: /* UTF-8 */
1288 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1289 &vpd->device_identifier[0]);
1290 break;
1291 default:
1292 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1293 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1294 ret = -EINVAL;
c66ac9db
NB		 1295 break;
1296 }
1297
1298 if (p_buf)
1299 strncpy(p_buf, buf, p_buf_len);
1300 else
6708bb27 1301 pr_debug("%s", buf);
c66ac9db
NB		 1302
1303 return ret;
1304}
1305
1306int
1307transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1308{
1309 static const char hex_str[] = "0123456789abcdef";
1310 int j = 0, i = 4; /* offset to start of the identifer */
1311
1312 /*
1313 * The VPD Code Set (encoding)
1314 *
1315 * from spc3r23.pdf Section 7.6.3.1 Table 296
1316 */
1317 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1318 switch (vpd->device_identifier_code_set) {
1319 case 0x01: /* Binary */
1320 vpd->device_identifier[j++] =
1321 hex_str[vpd->device_identifier_type];
1322 while (i < (4 + page_83[3])) {
1323 vpd->device_identifier[j++] =
1324 hex_str[(page_83[i] & 0xf0) >> 4];
1325 vpd->device_identifier[j++] =
1326 hex_str[page_83[i] & 0x0f];
1327 i++;
1328 }
1329 break;
1330 case 0x02: /* ASCII */
1331 case 0x03: /* UTF-8 */
1332 while (i < (4 + page_83[3]))
1333 vpd->device_identifier[j++] = page_83[i++];
1334 break;
1335 default:
1336 break;
1337 }
1338
1339 return transport_dump_vpd_ident(vpd, NULL, 0);
1340}
1341EXPORT_SYMBOL(transport_set_vpd_ident);
1342
1343static void core_setup_task_attr_emulation(struct se_device *dev)
1344{
1345 /*
1346 * If this device is from Target_Core_Mod/pSCSI, disable the
1347 * SAM Task Attribute emulation.
1348 *
1349 * This is currently not available in upsream Linux/SCSI Target
1350 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1351 */
e3d6f909 1352 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1353 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1354 return;
1355 }
1356
1357 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1358 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1359 " device\n", dev->transport->name,
1360 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1361}
1362
1363static void scsi_dump_inquiry(struct se_device *dev)
1364{
e3d6f909 1365 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
c66ac9db
NB		 1366 int i, device_type;
1367 /*
1368 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1369 */
6708bb27 1370 pr_debug(" Vendor: ");
c66ac9db
NB		 1371 for (i = 0; i < 8; i++)
1372 if (wwn->vendor[i] >= 0x20)
6708bb27 1373 pr_debug("%c", wwn->vendor[i]);
c66ac9db 1374 else
6708bb27 1375 pr_debug(" ");
c66ac9db 1376
6708bb27 1377 pr_debug(" Model: ");
c66ac9db
NB		 1378 for (i = 0; i < 16; i++)
1379 if (wwn->model[i] >= 0x20)
6708bb27 1380 pr_debug("%c", wwn->model[i]);
c66ac9db 1381 else
6708bb27 1382 pr_debug(" ");
c66ac9db 1383
6708bb27 1384 pr_debug(" Revision: ");
c66ac9db
NB		 1385 for (i = 0; i < 4; i++)
1386 if (wwn->revision[i] >= 0x20)
6708bb27 1387 pr_debug("%c", wwn->revision[i]);
c66ac9db 1388 else
6708bb27 1389 pr_debug(" ");
c66ac9db 1390
6708bb27 1391 pr_debug("\n");
c66ac9db 1392
e3d6f909 1393 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1394 pr_debug(" Type: %s ", scsi_device_type(device_type));
1395 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1396 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1397}
1398
1399struct se_device *transport_add_device_to_core_hba(
1400 struct se_hba *hba,
1401 struct se_subsystem_api *transport,
1402 struct se_subsystem_dev *se_dev,
1403 u32 device_flags,
1404 void *transport_dev,
1405 struct se_dev_limits *dev_limits,
1406 const char *inquiry_prod,
1407 const char *inquiry_rev)
1408{
12a18bdc 1409 int force_pt;
c66ac9db
NB		 1410 struct se_device *dev;
1411
1412 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1413 if (!dev) {
1414 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1415 return NULL;
1416 }
c66ac9db 1417
e3d6f909 1418 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1419 dev->dev_flags = device_flags;
1420 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1421 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1422 dev->se_hba = hba;
1423 dev->se_sub_dev = se_dev;
1424 dev->transport = transport;
1425 atomic_set(&dev->active_cmds, 0);
1426 INIT_LIST_HEAD(&dev->dev_list);
1427 INIT_LIST_HEAD(&dev->dev_sep_list);
1428 INIT_LIST_HEAD(&dev->dev_tmr_list);
1429 INIT_LIST_HEAD(&dev->execute_task_list);
1430 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1431 INIT_LIST_HEAD(&dev->ordered_cmd_list);
1432 INIT_LIST_HEAD(&dev->state_task_list);
07bde79a 1433 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1434 spin_lock_init(&dev->execute_task_lock);
1435 spin_lock_init(&dev->delayed_cmd_lock);
1436 spin_lock_init(&dev->ordered_cmd_lock);
1437 spin_lock_init(&dev->state_task_lock);
1438 spin_lock_init(&dev->dev_alua_lock);
1439 spin_lock_init(&dev->dev_reservation_lock);
1440 spin_lock_init(&dev->dev_status_lock);
1441 spin_lock_init(&dev->dev_status_thr_lock);
1442 spin_lock_init(&dev->se_port_lock);
1443 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1444 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1445
1446 dev->queue_depth = dev_limits->queue_depth;
1447 atomic_set(&dev->depth_left, dev->queue_depth);
1448 atomic_set(&dev->dev_ordered_id, 0);
1449
1450 se_dev_set_default_attribs(dev, dev_limits);
1451
1452 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1453 dev->creation_time = get_jiffies_64();
1454 spin_lock_init(&dev->stats_lock);
1455
1456 spin_lock(&hba->device_lock);
1457 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1458 hba->dev_count++;
1459 spin_unlock(&hba->device_lock);
1460 /*
1461 * Setup the SAM Task Attribute emulation for struct se_device
1462 */
1463 core_setup_task_attr_emulation(dev);
1464 /*
1465 * Force PR and ALUA passthrough emulation with internal object use.
1466 */
1467 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1468 /*
1469 * Setup the Reservations infrastructure for struct se_device
1470 */
1471 core_setup_reservations(dev, force_pt);
1472 /*
1473 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1474 */
1475 if (core_setup_alua(dev, force_pt) < 0)
1476 goto out;
1477
1478 /*
1479 * Startup the struct se_device processing thread
1480 */
1481 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1482 "LIO_%s", dev->transport->name);
c66ac9db 1483 if (IS_ERR(dev->process_thread)) {
6708bb27 1484 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1485 dev->transport->name);
c66ac9db
NB		 1486 goto out;
1487 }
07bde79a
NB		 1488 /*
1489 * Setup work_queue for QUEUE_FULL
1490 */
1491 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1492 /*
1493 * Preload the initial INQUIRY const values if we are doing
1494 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1495 * passthrough because this is being provided by the backend LLD.
1496 * This is required so that transport_get_inquiry() copies these
1497 * originals once back into DEV_T10_WWN(dev) for the virtual device
1498 * setup.
1499 */
e3d6f909 1500 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1501 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1502 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1503 " INQUIRY consts\n");
1504 goto out;
1505 }
1506
e3d6f909
AG		 1507 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1508 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1509 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1510 }
1511 scsi_dump_inquiry(dev);
1512
12a18bdc 1513 return dev;
c66ac9db 1514out:
c66ac9db
NB		 1515 kthread_stop(dev->process_thread);
1516
1517 spin_lock(&hba->device_lock);
1518 list_del(&dev->dev_list);
1519 hba->dev_count--;
1520 spin_unlock(&hba->device_lock);
1521
1522 se_release_vpd_for_dev(dev);
1523
c66ac9db
NB		 1524 kfree(dev);
1525
1526 return NULL;
1527}
1528EXPORT_SYMBOL(transport_add_device_to_core_hba);
1529
1530/* transport_generic_prepare_cdb():
1531 *
1532 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1533 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1534 * The point of this is since we are mapping iSCSI LUNs to
1535 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1536 * devices and HBAs for a loop.
1537 */
1538static inline void transport_generic_prepare_cdb(
1539 unsigned char *cdb)
1540{
1541 switch (cdb[0]) {
1542 case READ_10: /* SBC - RDProtect */
1543 case READ_12: /* SBC - RDProtect */
1544 case READ_16: /* SBC - RDProtect */
1545 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1546 case VERIFY: /* SBC - VRProtect */
1547 case VERIFY_16: /* SBC - VRProtect */
1548 case WRITE_VERIFY: /* SBC - VRProtect */
1549 case WRITE_VERIFY_12: /* SBC - VRProtect */
1550 break;
1551 default:
1552 cdb[1] &= 0x1f; /* clear logical unit number */
1553 break;
1554 }
1555}
1556
1557static struct se_task *
1558transport_generic_get_task(struct se_cmd *cmd,
1559 enum dma_data_direction data_direction)
1560{
1561 struct se_task *task;
5951146d 1562 struct se_device *dev = cmd->se_dev;
c66ac9db 1563
6708bb27 1564 task = dev->transport->alloc_task(cmd->t_task_cdb);
c66ac9db 1565 if (!task) {
6708bb27 1566 pr_err("Unable to allocate struct se_task\n");
c66ac9db
NB		 1567 return NULL;
1568 }
1569
1570 INIT_LIST_HEAD(&task->t_list);
1571 INIT_LIST_HEAD(&task->t_execute_list);
1572 INIT_LIST_HEAD(&task->t_state_list);
1573 init_completion(&task->task_stop_comp);
c66ac9db
NB		 1574 task->task_se_cmd = cmd;
1575 task->se_dev = dev;
1576 task->task_data_direction = data_direction;
1577
c66ac9db
NB		 1578 return task;
1579}
1580
1581static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1582
c66ac9db
NB		 1583/*
1584 * Used by fabric modules containing a local struct se_cmd within their
1585 * fabric dependent per I/O descriptor.
1586 */
1587void transport_init_se_cmd(
1588 struct se_cmd *cmd,
1589 struct target_core_fabric_ops *tfo,
1590 struct se_session *se_sess,
1591 u32 data_length,
1592 int data_direction,
1593 int task_attr,
1594 unsigned char *sense_buffer)
1595{
5951146d
AG		 1596 INIT_LIST_HEAD(&cmd->se_lun_node);
1597 INIT_LIST_HEAD(&cmd->se_delayed_node);
1598 INIT_LIST_HEAD(&cmd->se_ordered_node);
07bde79a 1599 INIT_LIST_HEAD(&cmd->se_qf_node);
c66ac9db 1600
a1d8b49a
AG		 1601 INIT_LIST_HEAD(&cmd->t_task_list);
1602 init_completion(&cmd->transport_lun_fe_stop_comp);
1603 init_completion(&cmd->transport_lun_stop_comp);
1604 init_completion(&cmd->t_transport_stop_comp);
1605 spin_lock_init(&cmd->t_state_lock);
1606 atomic_set(&cmd->transport_dev_active, 1);
c66ac9db
NB		 1607
1608 cmd->se_tfo = tfo;
1609 cmd->se_sess = se_sess;
1610 cmd->data_length = data_length;
1611 cmd->data_direction = data_direction;
1612 cmd->sam_task_attr = task_attr;
1613 cmd->sense_buffer = sense_buffer;
1614}
1615EXPORT_SYMBOL(transport_init_se_cmd);
1616
1617static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1618{
1619 /*
1620 * Check if SAM Task Attribute emulation is enabled for this
1621 * struct se_device storage object
1622 */
5951146d 1623 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1624 return 0;
1625
e66ecd50 1626 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1627 pr_debug("SAM Task Attribute ACA"
c66ac9db 1628 " emulation is not supported\n");
e3d6f909 1629 return -EINVAL;
c66ac9db
NB		 1630 }
1631 /*
1632 * Used to determine when ORDERED commands should go from
1633 * Dormant to Active status.
1634 */
5951146d 1635 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1636 smp_mb__after_atomic_inc();
6708bb27 1637 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1638 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1639 cmd->se_dev->transport->name);
c66ac9db
NB		 1640 return 0;
1641}
1642
1643void transport_free_se_cmd(
1644 struct se_cmd *se_cmd)
1645{
1646 if (se_cmd->se_tmr_req)
1647 core_tmr_release_req(se_cmd->se_tmr_req);
1648 /*
1649 * Check and free any extended CDB buffer that was allocated
1650 */
a1d8b49a
AG		 1651 if (se_cmd->t_task_cdb != se_cmd->__t_task_cdb)
1652 kfree(se_cmd->t_task_cdb);
c66ac9db
NB		 1653}
1654EXPORT_SYMBOL(transport_free_se_cmd);
1655
1656static void transport_generic_wait_for_tasks(struct se_cmd *, int, int);
1657
1658/* transport_generic_allocate_tasks():
1659 *
1660 * Called from fabric RX Thread.
1661 */
1662int transport_generic_allocate_tasks(
1663 struct se_cmd *cmd,
1664 unsigned char *cdb)
1665{
1666 int ret;
1667
1668 transport_generic_prepare_cdb(cdb);
1669
1670 /*
1671 * This is needed for early exceptions.
1672 */
1673 cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
1674
c66ac9db
NB		 1675 /*
1676 * Ensure that the received CDB is less than the max (252 + 8) bytes
1677 * for VARIABLE_LENGTH_CMD
1678 */
1679 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1680 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1681 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1682 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
e3d6f909 1683 return -EINVAL;
c66ac9db
NB		 1684 }
1685 /*
1686 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1687 * allocate the additional extended CDB buffer now.. Otherwise
1688 * setup the pointer from __t_task_cdb to t_task_cdb.
1689 */
a1d8b49a
AG		 1690 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1691 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1692 GFP_KERNEL);
6708bb27
AG		 1693 if (!cmd->t_task_cdb) {
1694 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1695 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1696 scsi_command_size(cdb),
a1d8b49a 1697 (unsigned long)sizeof(cmd->__t_task_cdb));
e3d6f909 1698 return -ENOMEM;
c66ac9db
NB		 1699 }
1700 } else
a1d8b49a 1701 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1702 /*
a1d8b49a 1703 * Copy the original CDB into cmd->
c66ac9db 1704 */
a1d8b49a 1705 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1706 /*
1707 * Setup the received CDB based on SCSI defined opcodes and
1708 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1709 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1710 * pointer is expected to be setup before we reach this point.
1711 */
1712 ret = transport_generic_cmd_sequencer(cmd, cdb);
1713 if (ret < 0)
1714 return ret;
1715 /*
1716 * Check for SAM Task Attribute Emulation
1717 */
1718 if (transport_check_alloc_task_attr(cmd) < 0) {
1719 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1720 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1721 return -EINVAL;
c66ac9db
NB		 1722 }
1723 spin_lock(&cmd->se_lun->lun_sep_lock);
1724 if (cmd->se_lun->lun_sep)
1725 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1726 spin_unlock(&cmd->se_lun->lun_sep_lock);
1727 return 0;
1728}
1729EXPORT_SYMBOL(transport_generic_allocate_tasks);
1730
1731/*
1732 * Used by fabric module frontends not defining a TFO->new_cmd_map()
1733 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD statis
1734 */
1735int transport_generic_handle_cdb(
1736 struct se_cmd *cmd)
1737{
e3d6f909 1738 if (!cmd->se_lun) {
c66ac9db 1739 dump_stack();
6708bb27 1740 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1741 return -EINVAL;
c66ac9db 1742 }
695434e1 1743
c66ac9db
NB		 1744 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD);
1745 return 0;
1746}
1747EXPORT_SYMBOL(transport_generic_handle_cdb);
1748
dd8ae59d
NB		 1749static void transport_generic_request_failure(struct se_cmd *,
1750 struct se_device *, int, int);
695434e1
NB		 1751/*
1752 * Used by fabric module frontends to queue tasks directly.
1753 * Many only be used from process context only
1754 */
1755int transport_handle_cdb_direct(
1756 struct se_cmd *cmd)
1757{
dd8ae59d
NB		 1758 int ret;
1759
695434e1
NB		 1760 if (!cmd->se_lun) {
1761 dump_stack();
6708bb27 1762 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1763 return -EINVAL;
1764 }
1765 if (in_interrupt()) {
1766 dump_stack();
6708bb27 1767 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1768 " from interrupt context\n");
1769 return -EINVAL;
1770 }
dd8ae59d
NB		 1771 /*
1772 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1773 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1774 * in existing usage to ensure that outstanding descriptors are handled
1775 * correctly during shutdown via transport_generic_wait_for_tasks()
1776 *
1777 * Also, we don't take cmd->t_state_lock here as we only expect
1778 * this to be called for initial descriptor submission.
1779 */
1780 cmd->t_state = TRANSPORT_NEW_CMD;
1781 atomic_set(&cmd->t_transport_active, 1);
1782 /*
1783 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1784 * so follow TRANSPORT_NEW_CMD processing thread context usage
1785 * and call transport_generic_request_failure() if necessary..
1786 */
1787 ret = transport_generic_new_cmd(cmd);
1788 if (ret == -EAGAIN)
1789 return 0;
1790 else if (ret < 0) {
1791 cmd->transport_error_status = ret;
1792 transport_generic_request_failure(cmd, NULL, 0,
1793 (cmd->data_direction != DMA_TO_DEVICE));
1794 }
1795 return 0;
695434e1
NB		 1796}
1797EXPORT_SYMBOL(transport_handle_cdb_direct);
1798
c66ac9db
NB		 1799/*
1800 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1801 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1802 * complete setup in TCM process context w/ TFO->new_cmd_map().
1803 */
1804int transport_generic_handle_cdb_map(
1805 struct se_cmd *cmd)
1806{
e3d6f909 1807 if (!cmd->se_lun) {
c66ac9db 1808 dump_stack();
6708bb27 1809 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1810 return -EINVAL;
c66ac9db
NB		 1811 }
1812
1813 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP);
1814 return 0;
1815}
1816EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1817
1818/* transport_generic_handle_data():
1819 *
1820 *
1821 */
1822int transport_generic_handle_data(
1823 struct se_cmd *cmd)
1824{
1825 /*
1826 * For the software fabric case, then we assume the nexus is being
1827 * failed/shutdown when signals are pending from the kthread context
1828 * caller, so we return a failure. For the HW target mode case running
1829 * in interrupt code, the signal_pending() check is skipped.
1830 */
1831 if (!in_interrupt() && signal_pending(current))
e3d6f909 1832 return -EPERM;
c66ac9db
NB		 1833 /*
1834 * If the received CDB has aleady been ABORTED by the generic
1835 * target engine, we now call transport_check_aborted_status()
1836 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1837 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1838 * sequences at this point.
1839 */
1840 if (transport_check_aborted_status(cmd, 1) != 0)
1841 return 0;
1842
1843 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE);
1844 return 0;
1845}
1846EXPORT_SYMBOL(transport_generic_handle_data);
1847
1848/* transport_generic_handle_tmr():
1849 *
1850 *
1851 */
1852int transport_generic_handle_tmr(
1853 struct se_cmd *cmd)
1854{
1855 /*
1856 * This is needed for early exceptions.
1857 */
1858 cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
c66ac9db
NB		 1859
1860 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR);
1861 return 0;
1862}
1863EXPORT_SYMBOL(transport_generic_handle_tmr);
1864
f4366772
NB		 1865void transport_generic_free_cmd_intr(
1866 struct se_cmd *cmd)
1867{
1868 transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR);
1869}
1870EXPORT_SYMBOL(transport_generic_free_cmd_intr);
1871
c66ac9db
NB		 1872static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1873{
1874 struct se_task *task, *task_tmp;
1875 unsigned long flags;
1876 int ret = 0;
1877
6708bb27 1878 pr_debug("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 1879 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 1880
1881 /*
1882 * No tasks remain in the execution queue
1883 */
a1d8b49a 1884 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1885 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 1886 &cmd->t_task_list, t_list) {
6708bb27 1887 pr_debug("task_no[%d] - Processing task %p\n",
c66ac9db
NB		 1888 task->task_no, task);
1889 /*
1890 * If the struct se_task has not been sent and is not active,
1891 * remove the struct se_task from the execution queue.
1892 */
1893 if (!atomic_read(&task->task_sent) &&
1894 !atomic_read(&task->task_active)) {
a1d8b49a 1895 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1896 flags);
1897 transport_remove_task_from_execute_queue(task,
1898 task->se_dev);
1899
6708bb27 1900 pr_debug("task_no[%d] - Removed from execute queue\n",
c66ac9db 1901 task->task_no);
a1d8b49a 1902 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 1903 continue;
1904 }
1905
1906 /*
1907 * If the struct se_task is active, sleep until it is returned
1908 * from the plugin.
1909 */
1910 if (atomic_read(&task->task_active)) {
1911 atomic_set(&task->task_stop, 1);
a1d8b49a 1912 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1913 flags);
1914
6708bb27 1915 pr_debug("task_no[%d] - Waiting to complete\n",
c66ac9db
NB		 1916 task->task_no);
1917 wait_for_completion(&task->task_stop_comp);
6708bb27 1918 pr_debug("task_no[%d] - Stopped successfully\n",
c66ac9db
NB		 1919 task->task_no);
1920
a1d8b49a
AG		 1921 spin_lock_irqsave(&cmd->t_state_lock, flags);
1922 atomic_dec(&cmd->t_task_cdbs_left);
c66ac9db
NB		 1923
1924 atomic_set(&task->task_active, 0);
1925 atomic_set(&task->task_stop, 0);
1926 } else {
6708bb27 1927 pr_debug("task_no[%d] - Did nothing\n", task->task_no);
c66ac9db
NB		 1928 ret++;
1929 }
1930
1931 __transport_stop_task_timer(task, &flags);
1932 }
a1d8b49a 1933 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1934
1935 return ret;
1936}
1937
c66ac9db
NB		 1938/*
1939 * Handle SAM-esque emulation for generic transport request failures.
1940 */
1941static void transport_generic_request_failure(
1942 struct se_cmd *cmd,
1943 struct se_device *dev,
1944 int complete,
1945 int sc)
1946{
07bde79a
NB		 1947 int ret = 0;
1948
6708bb27 1949 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1950 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1951 cmd->t_task_cdb[0]);
6708bb27 1952 pr_debug("-----[ i_state: %d t_state/def_t_state:"
c66ac9db 1953 " %d/%d transport_error_status: %d\n",
e3d6f909 1954 cmd->se_tfo->get_cmd_state(cmd),
c66ac9db
NB		 1955 cmd->t_state, cmd->deferred_t_state,
1956 cmd->transport_error_status);
6708bb27 1957 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
c66ac9db
NB		 1958 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1959 " t_transport_active: %d t_transport_stop: %d"
6708bb27 1960 " t_transport_sent: %d\n", cmd->t_task_list_num,
a1d8b49a
AG		 1961 atomic_read(&cmd->t_task_cdbs_left),
1962 atomic_read(&cmd->t_task_cdbs_sent),
1963 atomic_read(&cmd->t_task_cdbs_ex_left),
1964 atomic_read(&cmd->t_transport_active),
1965 atomic_read(&cmd->t_transport_stop),
1966 atomic_read(&cmd->t_transport_sent));
c66ac9db
NB		 1967
1968 transport_stop_all_task_timers(cmd);
1969
1970 if (dev)
e3d6f909 1971 atomic_inc(&dev->depth_left);
c66ac9db
NB		 1972 /*
1973 * For SAM Task Attribute emulation for failed struct se_cmd
1974 */
1975 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1976 transport_complete_task_attr(cmd);
1977
1978 if (complete) {
1979 transport_direct_request_timeout(cmd);
1980 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
1981 }
1982
1983 switch (cmd->transport_error_status) {
1984 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
1985 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1986 break;
1987 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
1988 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
1989 break;
1990 case PYX_TRANSPORT_INVALID_CDB_FIELD:
1991 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1992 break;
1993 case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
1994 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1995 break;
1996 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
1997 if (!sc)
1998 transport_new_cmd_failure(cmd);
1999 /*
2000 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
2001 * we force this session to fall back to session
2002 * recovery.
2003 */
e3d6f909
AG		 2004 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
2005 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
c66ac9db
NB		 2006
2007 goto check_stop;
2008 case PYX_TRANSPORT_LU_COMM_FAILURE:
2009 case PYX_TRANSPORT_ILLEGAL_REQUEST:
2010 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2011 break;
2012 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
2013 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
2014 break;
2015 case PYX_TRANSPORT_WRITE_PROTECTED:
2016 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
2017 break;
2018 case PYX_TRANSPORT_RESERVATION_CONFLICT:
2019 /*
2020 * No SENSE Data payload for this case, set SCSI Status
2021 * and queue the response to $FABRIC_MOD.
2022 *
2023 * Uses linux/include/scsi/scsi.h SAM status codes defs
2024 */
2025 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2026 /*
2027 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2028 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2029 * CONFLICT STATUS.
2030 *
2031 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2032 */
e3d6f909
AG		 2033 if (cmd->se_sess &&
2034 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2035 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 2036 cmd->orig_fe_lun, 0x2C,
2037 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2038
07bde79a
NB		 2039 ret = cmd->se_tfo->queue_status(cmd);
2040 if (ret == -EAGAIN)
2041 goto queue_full;
c66ac9db
NB		 2042 goto check_stop;
2043 case PYX_TRANSPORT_USE_SENSE_REASON:
2044 /*
2045 * struct se_cmd->scsi_sense_reason already set
2046 */
2047 break;
2048 default:
6708bb27 2049 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
a1d8b49a 2050 cmd->t_task_cdb[0],
c66ac9db
NB		 2051 cmd->transport_error_status);
2052 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
2053 break;
2054 }
16ab8e60
NB		 2055 /*
2056 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
2057 * make the call to transport_send_check_condition_and_sense()
2058 * directly. Otherwise expect the fabric to make the call to
2059 * transport_send_check_condition_and_sense() after handling
2060 * possible unsoliticied write data payloads.
2061 */
2062 if (!sc && !cmd->se_tfo->new_cmd_map)
c66ac9db 2063 transport_new_cmd_failure(cmd);
07bde79a
NB		 2064 else {
2065 ret = transport_send_check_condition_and_sense(cmd,
2066 cmd->scsi_sense_reason, 0);
2067 if (ret == -EAGAIN)
2068 goto queue_full;
2069 }
2070
c66ac9db
NB		 2071check_stop:
2072 transport_lun_remove_cmd(cmd);
6708bb27 2073 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 2074 ;
07bde79a
NB		 2075 return;
2076
2077queue_full:
2078 cmd->t_state = TRANSPORT_COMPLETE_OK;
2079 transport_handle_queue_full(cmd, cmd->se_dev, transport_complete_qf);
c66ac9db
NB		 2080}
2081
2082static void transport_direct_request_timeout(struct se_cmd *cmd)
2083{
2084 unsigned long flags;
2085
a1d8b49a 2086 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 2087 if (!atomic_read(&cmd->t_transport_timeout)) {
a1d8b49a 2088 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2089 return;
2090 }
a1d8b49a
AG		 2091 if (atomic_read(&cmd->t_task_cdbs_timeout_left)) {
2092 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2093 return;
2094 }
2095
a1d8b49a
AG		 2096 atomic_sub(atomic_read(&cmd->t_transport_timeout),
2097 &cmd->t_se_count);
2098 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2099}
2100
2101static void transport_generic_request_timeout(struct se_cmd *cmd)
2102{
2103 unsigned long flags;
2104
2105 /*
a1d8b49a 2106 * Reset cmd->t_se_count to allow transport_generic_remove()
c66ac9db
NB		 2107 * to allow last call to free memory resources.
2108 */
a1d8b49a
AG		 2109 spin_lock_irqsave(&cmd->t_state_lock, flags);
2110 if (atomic_read(&cmd->t_transport_timeout) > 1) {
2111 int tmp = (atomic_read(&cmd->t_transport_timeout) - 1);
c66ac9db 2112
a1d8b49a 2113 atomic_sub(tmp, &cmd->t_se_count);
c66ac9db 2114 }
a1d8b49a 2115 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2116
35462975 2117 transport_generic_remove(cmd, 0);
c66ac9db
NB		 2118}
2119
c66ac9db
NB		 2120static inline u32 transport_lba_21(unsigned char *cdb)
2121{
2122 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2123}
2124
2125static inline u32 transport_lba_32(unsigned char *cdb)
2126{
2127 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2128}
2129
2130static inline unsigned long long transport_lba_64(unsigned char *cdb)
2131{
2132 unsigned int __v1, __v2;
2133
2134 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2135 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2136
2137 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2138}
2139
2140/*
2141 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2142 */
2143static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2144{
2145 unsigned int __v1, __v2;
2146
2147 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2148 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2149
2150 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2151}
2152
2153static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2154{
2155 unsigned long flags;
2156
a1d8b49a 2157 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 2158 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 2159 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2160}
2161
2162/*
2163 * Called from interrupt context.
2164 */
2165static void transport_task_timeout_handler(unsigned long data)
2166{
2167 struct se_task *task = (struct se_task *)data;
e3d6f909 2168 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db
NB		 2169 unsigned long flags;
2170
6708bb27 2171 pr_debug("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
c66ac9db 2172
a1d8b49a 2173 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2174 if (task->task_flags & TF_STOP) {
a1d8b49a 2175 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2176 return;
2177 }
2178 task->task_flags &= ~TF_RUNNING;
2179
2180 /*
2181 * Determine if transport_complete_task() has already been called.
2182 */
6708bb27
AG		 2183 if (!atomic_read(&task->task_active)) {
2184 pr_debug("transport task: %p cmd: %p timeout task_active"
c66ac9db 2185 " == 0\n", task, cmd);
a1d8b49a 2186 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2187 return;
2188 }
2189
a1d8b49a
AG		 2190 atomic_inc(&cmd->t_se_count);
2191 atomic_inc(&cmd->t_transport_timeout);
2192 cmd->t_tasks_failed = 1;
c66ac9db
NB		 2193
2194 atomic_set(&task->task_timeout, 1);
2195 task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
2196 task->task_scsi_status = 1;
2197
2198 if (atomic_read(&task->task_stop)) {
6708bb27 2199 pr_debug("transport task: %p cmd: %p timeout task_stop"
c66ac9db 2200 " == 1\n", task, cmd);
a1d8b49a 2201 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2202 complete(&task->task_stop_comp);
2203 return;
2204 }
2205
6708bb27
AG		 2206 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
2207 pr_debug("transport task: %p cmd: %p timeout non zero"
c66ac9db 2208 " t_task_cdbs_left\n", task, cmd);
a1d8b49a 2209 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2210 return;
2211 }
6708bb27 2212 pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
c66ac9db
NB		 2213 task, cmd);
2214
2215 cmd->t_state = TRANSPORT_COMPLETE_FAILURE;
a1d8b49a 2216 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2217
2218 transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE);
2219}
2220
2221/*
a1d8b49a 2222 * Called with cmd->t_state_lock held.
c66ac9db
NB		 2223 */
2224static void transport_start_task_timer(struct se_task *task)
2225{
2226 struct se_device *dev = task->se_dev;
2227 int timeout;
2228
2229 if (task->task_flags & TF_RUNNING)
2230 return;
2231 /*
2232 * If the task_timeout is disabled, exit now.
2233 */
e3d6f909 2234 timeout = dev->se_sub_dev->se_dev_attrib.task_timeout;
6708bb27 2235 if (!timeout)
c66ac9db
NB		 2236 return;
2237
2238 init_timer(&task->task_timer);
2239 task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
2240 task->task_timer.data = (unsigned long) task;
2241 task->task_timer.function = transport_task_timeout_handler;
2242
2243 task->task_flags |= TF_RUNNING;
2244 add_timer(&task->task_timer);
2245#if 0
6708bb27 2246 pr_debug("Starting task timer for cmd: %p task: %p seconds:"
c66ac9db
NB		 2247 " %d\n", task->task_se_cmd, task, timeout);
2248#endif
2249}
2250
2251/*
a1d8b49a 2252 * Called with spin_lock_irq(&cmd->t_state_lock) held.
c66ac9db
NB		 2253 */
2254void __transport_stop_task_timer(struct se_task *task, unsigned long *flags)
2255{
e3d6f909 2256 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db 2257
6708bb27 2258 if (!task->task_flags & TF_RUNNING)
c66ac9db
NB		 2259 return;
2260
2261 task->task_flags |= TF_STOP;
a1d8b49a 2262 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
c66ac9db
NB		 2263
2264 del_timer_sync(&task->task_timer);
2265
a1d8b49a 2266 spin_lock_irqsave(&cmd->t_state_lock, *flags);
c66ac9db
NB		 2267 task->task_flags &= ~TF_RUNNING;
2268 task->task_flags &= ~TF_STOP;
2269}
2270
2271static void transport_stop_all_task_timers(struct se_cmd *cmd)
2272{
2273 struct se_task *task = NULL, *task_tmp;
2274 unsigned long flags;
2275
a1d8b49a 2276 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2277 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2278 &cmd->t_task_list, t_list)
c66ac9db 2279 __transport_stop_task_timer(task, &flags);
a1d8b49a 2280 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2281}
2282
2283static inline int transport_tcq_window_closed(struct se_device *dev)
2284{
2285 if (dev->dev_tcq_window_closed++ <
2286 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
2287 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
2288 } else
2289 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
2290
e3d6f909 2291 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 2292 return 0;
2293}
2294
2295/*
2296 * Called from Fabric Module context from transport_execute_tasks()
2297 *
2298 * The return of this function determins if the tasks from struct se_cmd
2299 * get added to the execution queue in transport_execute_tasks(),
2300 * or are added to the delayed or ordered lists here.
2301 */
2302static inline int transport_execute_task_attr(struct se_cmd *cmd)
2303{
5951146d 2304 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 2305 return 1;
2306 /*
25985edc 2307 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 2308 * to allow the passed struct se_cmd list of tasks to the front of the list.
2309 */
e66ecd50 2310 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
5951146d 2311 atomic_inc(&cmd->se_dev->dev_hoq_count);
c66ac9db 2312 smp_mb__after_atomic_inc();
6708bb27 2313 pr_debug("Added HEAD_OF_QUEUE for CDB:"
c66ac9db 2314 " 0x%02x, se_ordered_id: %u\n",
6708bb27 2315 cmd->t_task_cdb[0],
c66ac9db
NB		 2316 cmd->se_ordered_id);
2317 return 1;
e66ecd50 2318 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d
AG		 2319 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2320 list_add_tail(&cmd->se_ordered_node,
2321 &cmd->se_dev->ordered_cmd_list);
2322 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
c66ac9db 2323
5951146d 2324 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 2325 smp_mb__after_atomic_inc();
2326
6708bb27 2327 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 2328 " list, se_ordered_id: %u\n",
a1d8b49a 2329 cmd->t_task_cdb[0],
c66ac9db
NB		 2330 cmd->se_ordered_id);
2331 /*
2332 * Add ORDERED command to tail of execution queue if
2333 * no other older commands exist that need to be
2334 * completed first.
2335 */
6708bb27 2336 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 2337 return 1;
2338 } else {
2339 /*
2340 * For SIMPLE and UNTAGGED Task Attribute commands
2341 */
5951146d 2342 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 2343 smp_mb__after_atomic_inc();
2344 }
2345 /*
2346 * Otherwise if one or more outstanding ORDERED task attribute exist,
2347 * add the dormant task(s) built for the passed struct se_cmd to the
2348 * execution queue and become in Active state for this struct se_device.
2349 */
5951146d 2350 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 2351 /*
2352 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 2353 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 2354 */
5951146d 2355 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2356 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 2357 list_add_tail(&cmd->se_delayed_node,
2358 &cmd->se_dev->delayed_cmd_list);
2359 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2360
6708bb27 2361 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 2362 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 2363 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 2364 cmd->se_ordered_id);
2365 /*
2366 * Return zero to let transport_execute_tasks() know
2367 * not to add the delayed tasks to the execution list.
2368 */
2369 return 0;
2370 }
2371 /*
2372 * Otherwise, no ORDERED task attributes exist..
2373 */
2374 return 1;
2375}
2376
2377/*
2378 * Called from fabric module context in transport_generic_new_cmd() and
2379 * transport_generic_process_write()
2380 */
2381static int transport_execute_tasks(struct se_cmd *cmd)
2382{
2383 int add_tasks;
2384
db1620a2
CH		 2385 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2386 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
2387 transport_generic_request_failure(cmd, NULL, 0, 1);
2388 return 0;
c66ac9db 2389 }
db1620a2 2390
c66ac9db
NB		 2391 /*
2392 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2393 * has occurred that prevents execution.
c66ac9db 2394 */
6708bb27 2395 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 2396 /*
2397 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2398 * attribute for the tasks of the received struct se_cmd CDB
2399 */
2400 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2401 if (!add_tasks)
c66ac9db
NB		 2402 goto execute_tasks;
2403 /*
2404 * This calls transport_add_tasks_from_cmd() to handle
2405 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2406 * (if enabled) in __transport_add_task_to_execute_queue() and
2407 * transport_add_task_check_sam_attr().
2408 */
2409 transport_add_tasks_from_cmd(cmd);
2410 }
2411 /*
2412 * Kick the execution queue for the cmd associated struct se_device
2413 * storage object.
2414 */
2415execute_tasks:
5951146d 2416 __transport_execute_tasks(cmd->se_dev);
c66ac9db
NB		 2417 return 0;
2418}
2419
2420/*
2421 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2422 * from struct se_device->execute_task_list and
2423 *
2424 * Called from transport_processing_thread()
2425 */
2426static int __transport_execute_tasks(struct se_device *dev)
2427{
2428 int error;
2429 struct se_cmd *cmd = NULL;
e3d6f909 2430 struct se_task *task = NULL;
c66ac9db
NB		 2431 unsigned long flags;
2432
2433 /*
2434 * Check if there is enough room in the device and HBA queue to send
a1d8b49a 2435 * struct se_tasks to the selected transport.
c66ac9db
NB		 2436 */
2437check_depth:
e3d6f909 2438 if (!atomic_read(&dev->depth_left))
c66ac9db 2439 return transport_tcq_window_closed(dev);
c66ac9db 2440
e3d6f909 2441 dev->dev_tcq_window_closed = 0;
c66ac9db 2442
e3d6f909
AG		 2443 spin_lock_irq(&dev->execute_task_lock);
2444 if (list_empty(&dev->execute_task_list)) {
2445 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2446 return 0;
2447 }
e3d6f909
AG		 2448 task = list_first_entry(&dev->execute_task_list,
2449 struct se_task, t_execute_list);
2450 list_del(&task->t_execute_list);
2451 atomic_set(&task->task_execute_queue, 0);
2452 atomic_dec(&dev->execute_tasks);
2453 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2454
2455 atomic_dec(&dev->depth_left);
c66ac9db 2456
e3d6f909 2457 cmd = task->task_se_cmd;
c66ac9db 2458
a1d8b49a 2459 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 2460 atomic_set(&task->task_active, 1);
2461 atomic_set(&task->task_sent, 1);
a1d8b49a 2462 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2463
a1d8b49a
AG		 2464 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2465 cmd->t_task_list_num)
c66ac9db
NB		 2466 atomic_set(&cmd->transport_sent, 1);
2467
2468 transport_start_task_timer(task);
a1d8b49a 2469 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2470 /*
2471 * The struct se_cmd->transport_emulate_cdb() function pointer is used
e3d6f909 2472 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
c66ac9db
NB		 2473 * struct se_subsystem_api->do_task() caller below.
2474 */
2475 if (cmd->transport_emulate_cdb) {
2476 error = cmd->transport_emulate_cdb(cmd);
2477 if (error != 0) {
2478 cmd->transport_error_status = error;
2479 atomic_set(&task->task_active, 0);
2480 atomic_set(&cmd->transport_sent, 0);
2481 transport_stop_tasks_for_cmd(cmd);
2482 transport_generic_request_failure(cmd, dev, 0, 1);
2483 goto check_depth;
2484 }
2485 /*
2486 * Handle the successful completion for transport_emulate_cdb()
2487 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2488 * Otherwise the caller is expected to complete the task with
2489 * proper status.
2490 */
2491 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2492 cmd->scsi_status = SAM_STAT_GOOD;
2493 task->task_scsi_status = GOOD;
2494 transport_complete_task(task, 1);
2495 }
2496 } else {
2497 /*
2498 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2499 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2500 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2501 * LUN emulation code.
2502 *
2503 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2504 * call ->do_task() directly and let the underlying TCM subsystem plugin
2505 * code handle the CDB emulation.
2506 */
e3d6f909
AG		 2507 if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2508 (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
c66ac9db
NB		 2509 error = transport_emulate_control_cdb(task);
2510 else
e3d6f909 2511 error = dev->transport->do_task(task);
c66ac9db
NB		 2512
2513 if (error != 0) {
2514 cmd->transport_error_status = error;
2515 atomic_set(&task->task_active, 0);
2516 atomic_set(&cmd->transport_sent, 0);
2517 transport_stop_tasks_for_cmd(cmd);
2518 transport_generic_request_failure(cmd, dev, 0, 1);
2519 }
2520 }
2521
2522 goto check_depth;
2523
2524 return 0;
2525}
2526
2527void transport_new_cmd_failure(struct se_cmd *se_cmd)
2528{
2529 unsigned long flags;
2530 /*
2531 * Any unsolicited data will get dumped for failed command inside of
2532 * the fabric plugin
2533 */
a1d8b49a 2534 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2535 se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2536 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
a1d8b49a 2537 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2538}
2539
2540static void transport_nop_wait_for_tasks(struct se_cmd *, int, int);
2541
2542static inline u32 transport_get_sectors_6(
2543 unsigned char *cdb,
2544 struct se_cmd *cmd,
2545 int *ret)
2546{
5951146d 2547 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2548
2549 /*
2550 * Assume TYPE_DISK for non struct se_device objects.
2551 * Use 8-bit sector value.
2552 */
2553 if (!dev)
2554 goto type_disk;
2555
2556 /*
2557 * Use 24-bit allocation length for TYPE_TAPE.
2558 */
e3d6f909 2559 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2560 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2561
2562 /*
2563 * Everything else assume TYPE_DISK Sector CDB location.
2564 * Use 8-bit sector value.
2565 */
2566type_disk:
2567 return (u32)cdb[4];
2568}
2569
2570static inline u32 transport_get_sectors_10(
2571 unsigned char *cdb,
2572 struct se_cmd *cmd,
2573 int *ret)
2574{
5951146d 2575 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2576
2577 /*
2578 * Assume TYPE_DISK for non struct se_device objects.
2579 * Use 16-bit sector value.
2580 */
2581 if (!dev)
2582 goto type_disk;
2583
2584 /*
2585 * XXX_10 is not defined in SSC, throw an exception
2586 */
e3d6f909
AG		 2587 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2588 *ret = -EINVAL;
c66ac9db
NB		 2589 return 0;
2590 }
2591
2592 /*
2593 * Everything else assume TYPE_DISK Sector CDB location.
2594 * Use 16-bit sector value.
2595 */
2596type_disk:
2597 return (u32)(cdb[7] << 8) + cdb[8];
2598}
2599
2600static inline u32 transport_get_sectors_12(
2601 unsigned char *cdb,
2602 struct se_cmd *cmd,
2603 int *ret)
2604{
5951146d 2605 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2606
2607 /*
2608 * Assume TYPE_DISK for non struct se_device objects.
2609 * Use 32-bit sector value.
2610 */
2611 if (!dev)
2612 goto type_disk;
2613
2614 /*
2615 * XXX_12 is not defined in SSC, throw an exception
2616 */
e3d6f909
AG		 2617 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2618 *ret = -EINVAL;
c66ac9db
NB		 2619 return 0;
2620 }
2621
2622 /*
2623 * Everything else assume TYPE_DISK Sector CDB location.
2624 * Use 32-bit sector value.
2625 */
2626type_disk:
2627 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2628}
2629
2630static inline u32 transport_get_sectors_16(
2631 unsigned char *cdb,
2632 struct se_cmd *cmd,
2633 int *ret)
2634{
5951146d 2635 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2636
2637 /*
2638 * Assume TYPE_DISK for non struct se_device objects.
2639 * Use 32-bit sector value.
2640 */
2641 if (!dev)
2642 goto type_disk;
2643
2644 /*
2645 * Use 24-bit allocation length for TYPE_TAPE.
2646 */
e3d6f909 2647 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2648 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2649
2650type_disk:
2651 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2652 (cdb[12] << 8) + cdb[13];
2653}
2654
2655/*
2656 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2657 */
2658static inline u32 transport_get_sectors_32(
2659 unsigned char *cdb,
2660 struct se_cmd *cmd,
2661 int *ret)
2662{
2663 /*
2664 * Assume TYPE_DISK for non struct se_device objects.
2665 * Use 32-bit sector value.
2666 */
2667 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2668 (cdb[30] << 8) + cdb[31];
2669
2670}
2671
2672static inline u32 transport_get_size(
2673 u32 sectors,
2674 unsigned char *cdb,
2675 struct se_cmd *cmd)
2676{
5951146d 2677 struct se_device *dev = cmd->se_dev;
c66ac9db 2678
e3d6f909 2679 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2680 if (cdb[1] & 1) { /* sectors */
e3d6f909 2681 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2682 } else /* bytes */
2683 return sectors;
2684 }
2685#if 0
6708bb27 2686 pr_debug("Returning block_size: %u, sectors: %u == %u for"
e3d6f909
AG		 2687 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2688 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2689 dev->transport->name);
c66ac9db 2690#endif
e3d6f909 2691 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2692}
2693
c66ac9db
NB		 2694static void transport_xor_callback(struct se_cmd *cmd)
2695{
2696 unsigned char *buf, *addr;
ec98f782 2697 struct scatterlist *sg;
c66ac9db
NB		 2698 unsigned int offset;
2699 int i;
ec98f782 2700 int count;
c66ac9db
NB		 2701 /*
2702 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2703 *
2704 * 1) read the specified logical block(s);
2705 * 2) transfer logical blocks from the data-out buffer;
2706 * 3) XOR the logical blocks transferred from the data-out buffer with
2707 * the logical blocks read, storing the resulting XOR data in a buffer;
2708 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2709 * blocks transferred from the data-out buffer; and
2710 * 5) transfer the resulting XOR data to the data-in buffer.
2711 */
2712 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2713 if (!buf) {
2714 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2715 return;
2716 }
2717 /*
ec98f782 2718 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2719 * into the locally allocated *buf
2720 */
ec98f782
AG		 2721 sg_copy_to_buffer(cmd->t_data_sg,
2722 cmd->t_data_nents,
2723 buf,
2724 cmd->data_length);
2725
c66ac9db
NB		 2726 /*
2727 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2728 * cmd->t_mem_bidi_list
c66ac9db
NB		 2729 */
2730
2731 offset = 0;
ec98f782
AG		 2732 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2733 addr = kmap_atomic(sg_page(sg), KM_USER0);
2734 if (!addr)
c66ac9db
NB		 2735 goto out;
2736
ec98f782
AG		 2737 for (i = 0; i < sg->length; i++)
2738 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2739
ec98f782 2740 offset += sg->length;
c66ac9db
NB		 2741 kunmap_atomic(addr, KM_USER0);
2742 }
ec98f782 2743
c66ac9db
NB		 2744out:
2745 kfree(buf);
2746}
2747
2748/*
2749 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2750 */
2751static int transport_get_sense_data(struct se_cmd *cmd)
2752{
2753 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2754 struct se_device *dev;
2755 struct se_task *task = NULL, *task_tmp;
2756 unsigned long flags;
2757 u32 offset = 0;
2758
e3d6f909
AG		 2759 WARN_ON(!cmd->se_lun);
2760
a1d8b49a 2761 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2762 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2763 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2764 return 0;
2765 }
2766
2767 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2768 &cmd->t_task_list, t_list) {
c66ac9db
NB		 2769
2770 if (!task->task_sense)
2771 continue;
2772
2773 dev = task->se_dev;
6708bb27 2774 if (!dev)
c66ac9db
NB		 2775 continue;
2776
e3d6f909 2777 if (!dev->transport->get_sense_buffer) {
6708bb27 2778 pr_err("dev->transport->get_sense_buffer"
c66ac9db
NB		 2779 " is NULL\n");
2780 continue;
2781 }
2782
e3d6f909 2783 sense_buffer = dev->transport->get_sense_buffer(task);
6708bb27
AG		 2784 if (!sense_buffer) {
2785 pr_err("ITT[0x%08x]_TASK[%d]: Unable to locate"
c66ac9db 2786 " sense buffer for task with sense\n",
e3d6f909 2787 cmd->se_tfo->get_task_tag(cmd), task->task_no);
c66ac9db
NB		 2788 continue;
2789 }
a1d8b49a 2790 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2791
e3d6f909 2792 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2793 TRANSPORT_SENSE_BUFFER);
2794
5951146d 2795 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2796 TRANSPORT_SENSE_BUFFER);
2797 cmd->scsi_status = task->task_scsi_status;
2798 /* Automatically padded */
2799 cmd->scsi_sense_length =
2800 (TRANSPORT_SENSE_BUFFER + offset);
2801
6708bb27 2802 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
c66ac9db 2803 " and sense\n",
e3d6f909 2804 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2805 cmd->scsi_status);
2806 return 0;
2807 }
a1d8b49a 2808 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2809
2810 return -1;
2811}
2812
c66ac9db
NB		 2813static int
2814transport_handle_reservation_conflict(struct se_cmd *cmd)
2815{
2816 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
2817 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2818 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2819 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2820 /*
2821 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2822 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2823 * CONFLICT STATUS.
2824 *
2825 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2826 */
e3d6f909
AG		 2827 if (cmd->se_sess &&
2828 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2829 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 2830 cmd->orig_fe_lun, 0x2C,
2831 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
5951146d 2832 return -EINVAL;
c66ac9db
NB		 2833}
2834
ec98f782
AG		 2835static inline long long transport_dev_end_lba(struct se_device *dev)
2836{
2837 return dev->transport->get_blocks(dev) + 1;
2838}
2839
2840static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2841{
2842 struct se_device *dev = cmd->se_dev;
2843 u32 sectors;
2844
2845 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2846 return 0;
2847
2848 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2849
6708bb27
AG		 2850 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2851 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2852 " transport_dev_end_lba(): %llu\n",
2853 cmd->t_task_lba, sectors,
2854 transport_dev_end_lba(dev));
7abbe7f3 2855 return -EINVAL;
ec98f782
AG		 2856 }
2857
7abbe7f3 2858 return 0;
ec98f782
AG		 2859}
2860
706d5860
NB		 2861static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2862{
2863 /*
2864 * Determine if the received WRITE_SAME is used to for direct
2865 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2866 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2867 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2868 */
2869 int passthrough = (dev->transport->transport_type ==
2870 TRANSPORT_PLUGIN_PHBA_PDEV);
2871
2872 if (!passthrough) {
2873 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2874 pr_err("WRITE_SAME PBDATA and LBDATA"
2875 " bits not supported for Block Discard"
2876 " Emulation\n");
2877 return -ENOSYS;
2878 }
2879 /*
2880 * Currently for the emulated case we only accept
2881 * tpws with the UNMAP=1 bit set.
2882 */
2883 if (!(flags[0] & 0x08)) {
2884 pr_err("WRITE_SAME w/o UNMAP bit not"
2885 " supported for Block Discard Emulation\n");
2886 return -ENOSYS;
2887 }
2888 }
2889
2890 return 0;
2891}
2892
c66ac9db
NB		 2893/* transport_generic_cmd_sequencer():
2894 *
2895 * Generic Command Sequencer that should work for most DAS transport
2896 * drivers.
2897 *
2898 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2899 * RX Thread.
2900 *
2901 * FIXME: Need to support other SCSI OPCODES where as well.
2902 */
2903static int transport_generic_cmd_sequencer(
2904 struct se_cmd *cmd,
2905 unsigned char *cdb)
2906{
5951146d 2907 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2908 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2909 int ret = 0, sector_ret = 0, passthrough;
2910 u32 sectors = 0, size = 0, pr_reg_type = 0;
2911 u16 service_action;
2912 u8 alua_ascq = 0;
2913 /*
2914 * Check for an existing UNIT ATTENTION condition
2915 */
2916 if (core_scsi3_ua_check(cmd, cdb) < 0) {
2917 cmd->transport_wait_for_tasks =
2918 &transport_nop_wait_for_tasks;
2919 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2920 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2921 return -EINVAL;
c66ac9db
NB		 2922 }
2923 /*
2924 * Check status of Asymmetric Logical Unit Assignment port
2925 */
e3d6f909 2926 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db
NB		 2927 if (ret != 0) {
2928 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
2929 /*
25985edc 2930 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2931 * The ALUA additional sense code qualifier (ASCQ) is determined
2932 * by the ALUA primary or secondary access state..
2933 */
2934 if (ret > 0) {
2935#if 0
6708bb27 2936 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2937 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2938 cmd->se_tfo->get_fabric_name(), alua_ascq);
c66ac9db
NB		 2939#endif
2940 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2941 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2942 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2943 return -EINVAL;
c66ac9db
NB		 2944 }
2945 goto out_invalid_cdb_field;
2946 }
2947 /*
2948 * Check status for SPC-3 Persistent Reservations
2949 */
e3d6f909
AG		 2950 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2951 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
c66ac9db
NB		 2952 cmd, cdb, pr_reg_type) != 0)
2953 return transport_handle_reservation_conflict(cmd);
2954 /*
2955 * This means the CDB is allowed for the SCSI Initiator port
2956 * when said port is *NOT* holding the legacy SPC-2 or
2957 * SPC-3 Persistent Reservation.
2958 */
2959 }
2960
2961 switch (cdb[0]) {
2962 case READ_6:
2963 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2964 if (sector_ret)
2965 goto out_unsupported_cdb;
2966 size = transport_get_size(sectors, cdb, cmd);
2967 cmd->transport_split_cdb = &split_cdb_XX_6;
a1d8b49a 2968 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2969 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2970 break;
2971 case READ_10:
2972 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2973 if (sector_ret)
2974 goto out_unsupported_cdb;
2975 size = transport_get_size(sectors, cdb, cmd);
2976 cmd->transport_split_cdb = &split_cdb_XX_10;
a1d8b49a 2977 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2978 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2979 break;
2980 case READ_12:
2981 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2982 if (sector_ret)
2983 goto out_unsupported_cdb;
2984 size = transport_get_size(sectors, cdb, cmd);
2985 cmd->transport_split_cdb = &split_cdb_XX_12;
a1d8b49a 2986 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2987 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2988 break;
2989 case READ_16:
2990 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2991 if (sector_ret)
2992 goto out_unsupported_cdb;
2993 size = transport_get_size(sectors, cdb, cmd);
2994 cmd->transport_split_cdb = &split_cdb_XX_16;
a1d8b49a 2995 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2996 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2997 break;
2998 case WRITE_6:
2999 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
3000 if (sector_ret)
3001 goto out_unsupported_cdb;
3002 size = transport_get_size(sectors, cdb, cmd);
3003 cmd->transport_split_cdb = &split_cdb_XX_6;
a1d8b49a 3004 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 3005 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3006 break;
3007 case WRITE_10:
3008 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3009 if (sector_ret)
3010 goto out_unsupported_cdb;
3011 size = transport_get_size(sectors, cdb, cmd);
3012 cmd->transport_split_cdb = &split_cdb_XX_10;
a1d8b49a
AG		 3013 cmd->t_task_lba = transport_lba_32(cdb);
3014 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 3015 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3016 break;
3017 case WRITE_12:
3018 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
3019 if (sector_ret)
3020 goto out_unsupported_cdb;
3021 size = transport_get_size(sectors, cdb, cmd);
3022 cmd->transport_split_cdb = &split_cdb_XX_12;
a1d8b49a
AG		 3023 cmd->t_task_lba = transport_lba_32(cdb);
3024 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 3025 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3026 break;
3027 case WRITE_16:
3028 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3029 if (sector_ret)
3030 goto out_unsupported_cdb;
3031 size = transport_get_size(sectors, cdb, cmd);
3032 cmd->transport_split_cdb = &split_cdb_XX_16;
a1d8b49a
AG		 3033 cmd->t_task_lba = transport_lba_64(cdb);
3034 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 3035 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3036 break;
3037 case XDWRITEREAD_10:
3038 if ((cmd->data_direction != DMA_TO_DEVICE) ||
a1d8b49a 3039 !(cmd->t_tasks_bidi))
c66ac9db
NB		 3040 goto out_invalid_cdb_field;
3041 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3042 if (sector_ret)
3043 goto out_unsupported_cdb;
3044 size = transport_get_size(sectors, cdb, cmd);
3045 cmd->transport_split_cdb = &split_cdb_XX_10;
a1d8b49a 3046 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 3047 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
e3d6f909 3048 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 3049 TRANSPORT_PLUGIN_PHBA_PDEV);
3050 /*
3051 * Skip the remaining assignments for TCM/PSCSI passthrough
3052 */
3053 if (passthrough)
3054 break;
3055 /*
3056 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
3057 */
3058 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 3059 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 3060 break;
3061 case VARIABLE_LENGTH_CMD:
3062 service_action = get_unaligned_be16(&cdb[8]);
3063 /*
3064 * Determine if this is TCM/PSCSI device and we should disable
3065 * internal emulation for this CDB.
3066 */
e3d6f909 3067 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 3068 TRANSPORT_PLUGIN_PHBA_PDEV);
3069
3070 switch (service_action) {
3071 case XDWRITEREAD_32:
3072 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
3073 if (sector_ret)
3074 goto out_unsupported_cdb;
3075 size = transport_get_size(sectors, cdb, cmd);
3076 /*
3077 * Use WRITE_32 and READ_32 opcodes for the emulated
3078 * XDWRITE_READ_32 logic.
3079 */
3080 cmd->transport_split_cdb = &split_cdb_XX_32;
a1d8b49a 3081 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 3082 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3083
3084 /*
3085 * Skip the remaining assignments for TCM/PSCSI passthrough
3086 */
3087 if (passthrough)
3088 break;
3089
3090 /*
3091 * Setup BIDI XOR callback to be run during
3092 * transport_generic_complete_ok()
3093 */
3094 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 3095 cmd->t_tasks_fua = (cdb[10] & 0x8);
c66ac9db
NB		 3096 break;
3097 case WRITE_SAME_32:
3098 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
3099 if (sector_ret)
3100 goto out_unsupported_cdb;
dd3a5ad8 3101
6708bb27 3102 if (sectors)
12850626 3103 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 3104 else {
3105 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
3106 " supported\n");
3107 goto out_invalid_cdb_field;
3108 }
dd3a5ad8 3109
a1d8b49a 3110 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 3111 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3112
706d5860 3113 if (target_check_write_same_discard(&cdb[10], dev) < 0)
c66ac9db 3114 goto out_invalid_cdb_field;
706d5860 3115
c66ac9db
NB		 3116 break;
3117 default:
6708bb27 3118 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 3119 " 0x%04x not supported\n", service_action);
3120 goto out_unsupported_cdb;
3121 }
3122 break;
e434f1f1 3123 case MAINTENANCE_IN:
e3d6f909 3124 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 3125 /* MAINTENANCE_IN from SCC-2 */
3126 /*
3127 * Check for emulated MI_REPORT_TARGET_PGS.
3128 */
3129 if (cdb[1] == MI_REPORT_TARGET_PGS) {
3130 cmd->transport_emulate_cdb =
e3d6f909 3131 (su_dev->t10_alua.alua_type ==
c66ac9db 3132 SPC3_ALUA_EMULATED) ?
e3d6f909 3133 core_emulate_report_target_port_groups :
c66ac9db
NB		 3134 NULL;
3135 }
3136 size = (cdb[6] << 24) | (cdb[7] << 16) |
3137 (cdb[8] << 8) | cdb[9];
3138 } else {
3139 /* GPCMD_SEND_KEY from multi media commands */
3140 size = (cdb[8] << 8) + cdb[9];
3141 }
05d1c7c0 3142 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3143 break;
3144 case MODE_SELECT:
3145 size = cdb[4];
3146 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3147 break;
3148 case MODE_SELECT_10:
3149 size = (cdb[7] << 8) + cdb[8];
3150 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3151 break;
3152 case MODE_SENSE:
3153 size = cdb[4];
05d1c7c0 3154 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3155 break;
3156 case MODE_SENSE_10:
3157 case GPCMD_READ_BUFFER_CAPACITY:
3158 case GPCMD_SEND_OPC:
3159 case LOG_SELECT:
3160 case LOG_SENSE:
3161 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 3162 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3163 break;
3164 case READ_BLOCK_LIMITS:
3165 size = READ_BLOCK_LEN;
05d1c7c0 3166 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3167 break;
3168 case GPCMD_GET_CONFIGURATION:
3169 case GPCMD_READ_FORMAT_CAPACITIES:
3170 case GPCMD_READ_DISC_INFO:
3171 case GPCMD_READ_TRACK_RZONE_INFO:
3172 size = (cdb[7] << 8) + cdb[8];
3173 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3174 break;
3175 case PERSISTENT_RESERVE_IN:
3176 case PERSISTENT_RESERVE_OUT:
3177 cmd->transport_emulate_cdb =
e3d6f909 3178 (su_dev->t10_pr.res_type ==
c66ac9db 3179 SPC3_PERSISTENT_RESERVATIONS) ?
e3d6f909 3180 core_scsi3_emulate_pr : NULL;
c66ac9db 3181 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 3182 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3183 break;
3184 case GPCMD_MECHANISM_STATUS:
3185 case GPCMD_READ_DVD_STRUCTURE:
3186 size = (cdb[8] << 8) + cdb[9];
3187 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3188 break;
3189 case READ_POSITION:
3190 size = READ_POSITION_LEN;
05d1c7c0 3191 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 3192 break;
e434f1f1 3193 case MAINTENANCE_OUT:
e3d6f909 3194 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 3195 /* MAINTENANCE_OUT from SCC-2
3196 *
3197 * Check for emulated MO_SET_TARGET_PGS.
3198 */
3199 if (cdb[1] == MO_SET_TARGET_PGS) {
3200 cmd->transport_emulate_cdb =
e3d6f909 3201 (su_dev->t10_alua.alua_type ==
c66ac9db 3202 SPC3_ALUA_EMULATED) ?
e3d6f909 3203 core_emulate_set_target_port_groups :
c66ac9db
NB		 3204 NULL;
3205 }
3206
3207 size = (cdb[6] << 24) | (cdb[7] << 16) |
3208 (cdb[8] << 8) | cdb[9];
3209 } else {
3210 /* GPCMD_REPORT_KEY from multi media commands */
3211 size = (cdb[8] << 8) + cdb[9];
3212 }
05d1c7c0 3213 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3214 break;
3215 case INQUIRY:
3216 size = (cdb[3] << 8) + cdb[4];
3217 /*
3218 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3219 * See spc4r17 section 5.3
3220 */
5951146d 3221 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3222 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3223 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3224 break;
3225 case READ_BUFFER:
3226 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 3227 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3228 break;
3229 case READ_CAPACITY:
3230 size = READ_CAP_LEN;
05d1c7c0 3231 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3232 break;
3233 case READ_MEDIA_SERIAL_NUMBER:
3234 case SECURITY_PROTOCOL_IN:
3235 case SECURITY_PROTOCOL_OUT:
3236 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 3237 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3238 break;
3239 case SERVICE_ACTION_IN:
3240 case ACCESS_CONTROL_IN:
3241 case ACCESS_CONTROL_OUT:
3242 case EXTENDED_COPY:
3243 case READ_ATTRIBUTE:
3244 case RECEIVE_COPY_RESULTS:
3245 case WRITE_ATTRIBUTE:
3246 size = (cdb[10] << 24) | (cdb[11] << 16) |
3247 (cdb[12] << 8) | cdb[13];
05d1c7c0 3248 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3249 break;
3250 case RECEIVE_DIAGNOSTIC:
3251 case SEND_DIAGNOSTIC:
3252 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 3253 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3254 break;
3255/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3256#if 0
3257 case GPCMD_READ_CD:
3258 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3259 size = (2336 * sectors);
05d1c7c0 3260 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3261 break;
3262#endif
3263 case READ_TOC:
3264 size = cdb[8];
05d1c7c0 3265 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3266 break;
3267 case REQUEST_SENSE:
3268 size = cdb[4];
05d1c7c0 3269 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3270 break;
3271 case READ_ELEMENT_STATUS:
3272 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 3273 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3274 break;
3275 case WRITE_BUFFER:
3276 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 3277 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3278 break;
3279 case RESERVE:
3280 case RESERVE_10:
3281 /*
3282 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3283 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3284 */
3285 if (cdb[0] == RESERVE_10)
3286 size = (cdb[7] << 8) | cdb[8];
3287 else
3288 size = cmd->data_length;
3289
3290 /*
3291 * Setup the legacy emulated handler for SPC-2 and
3292 * >= SPC-3 compatible reservation handling (CRH=1)
3293 * Otherwise, we assume the underlying SCSI logic is
3294 * is running in SPC_PASSTHROUGH, and wants reservations
3295 * emulation disabled.
3296 */
3297 cmd->transport_emulate_cdb =
e3d6f909 3298 (su_dev->t10_pr.res_type !=
c66ac9db 3299 SPC_PASSTHROUGH) ?
e3d6f909 3300 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 3301 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3302 break;
3303 case RELEASE:
3304 case RELEASE_10:
3305 /*
3306 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3307 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3308 */
3309 if (cdb[0] == RELEASE_10)
3310 size = (cdb[7] << 8) | cdb[8];
3311 else
3312 size = cmd->data_length;
3313
3314 cmd->transport_emulate_cdb =
e3d6f909 3315 (su_dev->t10_pr.res_type !=
c66ac9db 3316 SPC_PASSTHROUGH) ?
e3d6f909 3317 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 3318 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3319 break;
3320 case SYNCHRONIZE_CACHE:
3321 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3322 /*
3323 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3324 */
3325 if (cdb[0] == SYNCHRONIZE_CACHE) {
3326 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 3327 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 3328 } else {
3329 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 3330 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 3331 }
3332 if (sector_ret)
3333 goto out_unsupported_cdb;
3334
3335 size = transport_get_size(sectors, cdb, cmd);
3336 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3337
3338 /*
3339 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3340 */
e3d6f909 3341 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 3342 break;
3343 /*
3344 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3345 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3346 */
3347 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3348 /*
3349 * Check to ensure that LBA + Range does not exceed past end of
7abbe7f3 3350 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
c66ac9db 3351 */
7abbe7f3
NB		 3352 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
3353 if (transport_cmd_get_valid_sectors(cmd) < 0)
3354 goto out_invalid_cdb_field;
3355 }
c66ac9db
NB		 3356 break;
3357 case UNMAP:
3358 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 3359 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3360 break;
3361 case WRITE_SAME_16:
3362 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3363 if (sector_ret)
3364 goto out_unsupported_cdb;
dd3a5ad8 3365
6708bb27 3366 if (sectors)
12850626 3367 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 3368 else {
3369 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3370 goto out_invalid_cdb_field;
3371 }
dd3a5ad8 3372
5db0753b 3373 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
706d5860
NB		 3374 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3375
3376 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3377 goto out_invalid_cdb_field;
3378 break;
3379 case WRITE_SAME:
3380 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3381 if (sector_ret)
3382 goto out_unsupported_cdb;
3383
3384 if (sectors)
12850626 3385 size = transport_get_size(1, cdb, cmd);
706d5860
NB		 3386 else {
3387 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3388 goto out_invalid_cdb_field;
c66ac9db 3389 }
706d5860
NB		 3390
3391 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
c66ac9db 3392 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
706d5860
NB		 3393 /*
3394 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3395 * of byte 1 bit 3 UNMAP instead of original reserved field
3396 */
3397 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3398 goto out_invalid_cdb_field;
c66ac9db
NB		 3399 break;
3400 case ALLOW_MEDIUM_REMOVAL:
3401 case GPCMD_CLOSE_TRACK:
3402 case ERASE:
3403 case INITIALIZE_ELEMENT_STATUS:
3404 case GPCMD_LOAD_UNLOAD:
3405 case REZERO_UNIT:
3406 case SEEK_10:
3407 case GPCMD_SET_SPEED:
3408 case SPACE:
3409 case START_STOP:
3410 case TEST_UNIT_READY:
3411 case VERIFY:
3412 case WRITE_FILEMARKS:
3413 case MOVE_MEDIUM:
3414 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3415 break;
3416 case REPORT_LUNS:
3417 cmd->transport_emulate_cdb =
e3d6f909 3418 transport_core_report_lun_response;
c66ac9db
NB		 3419 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3420 /*
3421 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3422 * See spc4r17 section 5.3
3423 */
5951146d 3424 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3425 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3426 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3427 break;
3428 default:
6708bb27 3429 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 3430 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3431 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3432 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
3433 goto out_unsupported_cdb;
3434 }
3435
3436 if (size != cmd->data_length) {
6708bb27 3437 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 3438 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3439 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3440 cmd->data_length, size, cdb[0]);
3441
3442 cmd->cmd_spdtl = size;
3443
3444 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 3445 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 3446 " WRITE data\n");
3447 goto out_invalid_cdb_field;
3448 }
3449 /*
3450 * Reject READ_* or WRITE_* with overflow/underflow for
3451 * type SCF_SCSI_DATA_SG_IO_CDB.
3452 */
6708bb27
AG		 3453 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3454 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 3455 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3456 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3457 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3458 goto out_invalid_cdb_field;
3459 }
3460
3461 if (size > cmd->data_length) {
3462 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3463 cmd->residual_count = (size - cmd->data_length);
3464 } else {
3465 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3466 cmd->residual_count = (cmd->data_length - size);
3467 }
3468 cmd->data_length = size;
3469 }
3470
d0229ae3
AG		 3471 /* Let's limit control cdbs to a page, for simplicity's sake. */
3472 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3473 size > PAGE_SIZE)
3474 goto out_invalid_cdb_field;
3475
c66ac9db
NB		 3476 transport_set_supported_SAM_opcode(cmd);
3477 return ret;
3478
3479out_unsupported_cdb:
3480 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3481 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3482 return -EINVAL;
c66ac9db
NB		 3483out_invalid_cdb_field:
3484 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3485 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3486 return -EINVAL;
c66ac9db
NB		 3487}
3488
c66ac9db
NB		 3489/*
3490 * Called from transport_generic_complete_ok() and
3491 * transport_generic_request_failure() to determine which dormant/delayed
3492 * and ordered cmds need to have their tasks added to the execution queue.
3493 */
3494static void transport_complete_task_attr(struct se_cmd *cmd)
3495{
5951146d 3496 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3497 struct se_cmd *cmd_p, *cmd_tmp;
3498 int new_active_tasks = 0;
3499
e66ecd50 3500 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3501 atomic_dec(&dev->simple_cmds);
3502 smp_mb__after_atomic_dec();
3503 dev->dev_cur_ordered_id++;
6708bb27 3504 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3505 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3506 cmd->se_ordered_id);
e66ecd50 3507 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 3508 atomic_dec(&dev->dev_hoq_count);
3509 smp_mb__after_atomic_dec();
3510 dev->dev_cur_ordered_id++;
6708bb27 3511 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3512 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3513 cmd->se_ordered_id);
e66ecd50 3514 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db 3515 spin_lock(&dev->ordered_cmd_lock);
5951146d 3516 list_del(&cmd->se_ordered_node);
c66ac9db
NB		 3517 atomic_dec(&dev->dev_ordered_sync);
3518 smp_mb__after_atomic_dec();
3519 spin_unlock(&dev->ordered_cmd_lock);
3520
3521 dev->dev_cur_ordered_id++;
6708bb27 3522 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3523 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3524 }
3525 /*
3526 * Process all commands up to the last received
3527 * ORDERED task attribute which requires another blocking
3528 * boundary
3529 */
3530 spin_lock(&dev->delayed_cmd_lock);
3531 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3532 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3533
5951146d 3534 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3535 spin_unlock(&dev->delayed_cmd_lock);
3536
6708bb27 3537 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3538 " cmd_p: 0x%02x Task Attr: 0x%02x"
3539 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3540 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3541 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3542
3543 transport_add_tasks_from_cmd(cmd_p);
3544 new_active_tasks++;
3545
3546 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3547 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3548 break;
3549 }
3550 spin_unlock(&dev->delayed_cmd_lock);
3551 /*
3552 * If new tasks have become active, wake up the transport thread
3553 * to do the processing of the Active tasks.
3554 */
3555 if (new_active_tasks != 0)
e3d6f909 3556 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3557}
3558
07bde79a
NB		 3559static int transport_complete_qf(struct se_cmd *cmd)
3560{
3561 int ret = 0;
3562
3563 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
3564 return cmd->se_tfo->queue_status(cmd);
3565
3566 switch (cmd->data_direction) {
3567 case DMA_FROM_DEVICE:
3568 ret = cmd->se_tfo->queue_data_in(cmd);
3569 break;
3570 case DMA_TO_DEVICE:
ec98f782 3571 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3572 ret = cmd->se_tfo->queue_data_in(cmd);
3573 if (ret < 0)
3574 return ret;
3575 }
3576 /* Fall through for DMA_TO_DEVICE */
3577 case DMA_NONE:
3578 ret = cmd->se_tfo->queue_status(cmd);
3579 break;
3580 default:
3581 break;
3582 }
3583
3584 return ret;
3585}
3586
3587static void transport_handle_queue_full(
3588 struct se_cmd *cmd,
3589 struct se_device *dev,
3590 int (*qf_callback)(struct se_cmd *))
3591{
3592 spin_lock_irq(&dev->qf_cmd_lock);
3593 cmd->se_cmd_flags |= SCF_EMULATE_QUEUE_FULL;
3594 cmd->transport_qf_callback = qf_callback;
3595 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3596 atomic_inc(&dev->dev_qf_count);
3597 smp_mb__after_atomic_inc();
3598 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3599
3600 schedule_work(&cmd->se_dev->qf_work_queue);
3601}
3602
c66ac9db
NB		 3603static void transport_generic_complete_ok(struct se_cmd *cmd)
3604{
07bde79a 3605 int reason = 0, ret;
c66ac9db
NB		 3606 /*
3607 * Check if we need to move delayed/dormant tasks from cmds on the
3608 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3609 * Attribute.
3610 */
5951146d 3611 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3612 transport_complete_task_attr(cmd);
07bde79a
NB		 3613 /*
3614 * Check to schedule QUEUE_FULL work, or execute an existing
3615 * cmd->transport_qf_callback()
3616 */
3617 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3618 schedule_work(&cmd->se_dev->qf_work_queue);
3619
3620 if (cmd->transport_qf_callback) {
3621 ret = cmd->transport_qf_callback(cmd);
3622 if (ret < 0)
3623 goto queue_full;
3624
3625 cmd->transport_qf_callback = NULL;
3626 goto done;
3627 }
c66ac9db
NB		 3628 /*
3629 * Check if we need to retrieve a sense buffer from
3630 * the struct se_cmd in question.
3631 */
3632 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3633 if (transport_get_sense_data(cmd) < 0)
3634 reason = TCM_NON_EXISTENT_LUN;
3635
3636 /*
3637 * Only set when an struct se_task->task_scsi_status returned
3638 * a non GOOD status.
3639 */
3640 if (cmd->scsi_status) {
07bde79a 3641 ret = transport_send_check_condition_and_sense(
c66ac9db 3642 cmd, reason, 1);
07bde79a
NB		 3643 if (ret == -EAGAIN)
3644 goto queue_full;
3645
c66ac9db
NB		 3646 transport_lun_remove_cmd(cmd);
3647 transport_cmd_check_stop_to_fabric(cmd);
3648 return;
3649 }
3650 }
3651 /*
25985edc 3652 * Check for a callback, used by amongst other things
c66ac9db
NB		 3653 * XDWRITE_READ_10 emulation.
3654 */
3655 if (cmd->transport_complete_callback)
3656 cmd->transport_complete_callback(cmd);
3657
3658 switch (cmd->data_direction) {
3659 case DMA_FROM_DEVICE:
3660 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3661 if (cmd->se_lun->lun_sep) {
3662 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3663 cmd->data_length;
3664 }
3665 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3666
07bde79a
NB		 3667 ret = cmd->se_tfo->queue_data_in(cmd);
3668 if (ret == -EAGAIN)
3669 goto queue_full;
c66ac9db
NB		 3670 break;
3671 case DMA_TO_DEVICE:
3672 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3673 if (cmd->se_lun->lun_sep) {
3674 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3675 cmd->data_length;
3676 }
3677 spin_unlock(&cmd->se_lun->lun_sep_lock);
3678 /*
3679 * Check if we need to send READ payload for BIDI-COMMAND
3680 */
ec98f782 3681 if (cmd->t_bidi_data_sg) {
c66ac9db 3682 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3683 if (cmd->se_lun->lun_sep) {
3684 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3685 cmd->data_length;
3686 }
3687 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a
NB		 3688 ret = cmd->se_tfo->queue_data_in(cmd);
3689 if (ret == -EAGAIN)
3690 goto queue_full;
c66ac9db
NB		 3691 break;
3692 }
3693 /* Fall through for DMA_TO_DEVICE */
3694 case DMA_NONE:
07bde79a
NB		 3695 ret = cmd->se_tfo->queue_status(cmd);
3696 if (ret == -EAGAIN)
3697 goto queue_full;
c66ac9db
NB		 3698 break;
3699 default:
3700 break;
3701 }
3702
07bde79a 3703done:
c66ac9db
NB		 3704 transport_lun_remove_cmd(cmd);
3705 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3706 return;
3707
3708queue_full:
6708bb27 3709 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a
NB		 3710 " data_direction: %d\n", cmd, cmd->data_direction);
3711 transport_handle_queue_full(cmd, cmd->se_dev, transport_complete_qf);
c66ac9db
NB		 3712}
3713
3714static void transport_free_dev_tasks(struct se_cmd *cmd)
3715{
3716 struct se_task *task, *task_tmp;
3717 unsigned long flags;
3718
a1d8b49a 3719 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3720 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3721 &cmd->t_task_list, t_list) {
c66ac9db
NB		 3722 if (atomic_read(&task->task_active))
3723 continue;
3724
3725 kfree(task->task_sg_bidi);
3726 kfree(task->task_sg);
3727
3728 list_del(&task->t_list);
3729
a1d8b49a 3730 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3731 if (task->se_dev)
e3d6f909 3732 task->se_dev->transport->free_task(task);
c66ac9db 3733 else
6708bb27 3734 pr_err("task[%u] - task->se_dev is NULL\n",
c66ac9db 3735 task->task_no);
a1d8b49a 3736 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3737 }
a1d8b49a 3738 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3739}
3740
6708bb27 3741static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3742{
ec98f782 3743 struct scatterlist *sg;
ec98f782 3744 int count;
c66ac9db 3745
6708bb27
AG		 3746 for_each_sg(sgl, sg, nents, count)
3747 __free_page(sg_page(sg));
c66ac9db 3748
6708bb27
AG		 3749 kfree(sgl);
3750}
c66ac9db 3751
6708bb27
AG		 3752static inline void transport_free_pages(struct se_cmd *cmd)
3753{
3754 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3755 return;
3756
3757 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3758 cmd->t_data_sg = NULL;
3759 cmd->t_data_nents = 0;
c66ac9db 3760
6708bb27 3761 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3762 cmd->t_bidi_data_sg = NULL;
3763 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3764}
3765
3766static inline void transport_release_tasks(struct se_cmd *cmd)
3767{
3768 transport_free_dev_tasks(cmd);
3769}
3770
3771static inline int transport_dec_and_check(struct se_cmd *cmd)
3772{
3773 unsigned long flags;
3774
a1d8b49a
AG		 3775 spin_lock_irqsave(&cmd->t_state_lock, flags);
3776 if (atomic_read(&cmd->t_fe_count)) {
6708bb27 3777 if (!atomic_dec_and_test(&cmd->t_fe_count)) {
a1d8b49a 3778 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 3779 flags);
3780 return 1;
3781 }
3782 }
3783
a1d8b49a 3784 if (atomic_read(&cmd->t_se_count)) {
6708bb27 3785 if (!atomic_dec_and_test(&cmd->t_se_count)) {
a1d8b49a 3786 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 3787 flags);
3788 return 1;
3789 }
3790 }
a1d8b49a 3791 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3792
3793 return 0;
3794}
3795
3796static void transport_release_fe_cmd(struct se_cmd *cmd)
3797{
3798 unsigned long flags;
3799
3800 if (transport_dec_and_check(cmd))
3801 return;
3802
a1d8b49a 3803 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 3804 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 3805 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3806 goto free_pages;
3807 }
a1d8b49a 3808 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 3809 transport_all_task_dev_remove_state(cmd);
a1d8b49a 3810 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3811
3812 transport_release_tasks(cmd);
3813free_pages:
3814 transport_free_pages(cmd);
3815 transport_free_se_cmd(cmd);
35462975 3816 cmd->se_tfo->release_cmd(cmd);
c66ac9db
NB		 3817}
3818
35462975
CH		 3819static int
3820transport_generic_remove(struct se_cmd *cmd, int session_reinstatement)
c66ac9db
NB		 3821{
3822 unsigned long flags;
3823
c66ac9db
NB		 3824 if (transport_dec_and_check(cmd)) {
3825 if (session_reinstatement) {
a1d8b49a 3826 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3827 transport_all_task_dev_remove_state(cmd);
a1d8b49a 3828 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 3829 flags);
3830 }
3831 return 1;
3832 }
3833
a1d8b49a 3834 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 3835 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 3836 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3837 goto free_pages;
3838 }
a1d8b49a 3839 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 3840 transport_all_task_dev_remove_state(cmd);
a1d8b49a 3841 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3842
3843 transport_release_tasks(cmd);
5951146d 3844
c66ac9db
NB		 3845free_pages:
3846 transport_free_pages(cmd);
35462975 3847 transport_release_cmd(cmd);
c66ac9db
NB		 3848 return 0;
3849}
3850
3851/*
ec98f782
AG		 3852 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3853 * allocating in the core.
c66ac9db
NB		 3854 * @cmd: Associated se_cmd descriptor
3855 * @mem: SGL style memory for TCM WRITE / READ
3856 * @sg_mem_num: Number of SGL elements
3857 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3858 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3859 *
3860 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3861 * of parameters.
3862 */
3863int transport_generic_map_mem_to_cmd(
3864 struct se_cmd *cmd,
5951146d
AG		 3865 struct scatterlist *sgl,
3866 u32 sgl_count,
3867 struct scatterlist *sgl_bidi,
3868 u32 sgl_bidi_count)
c66ac9db 3869{
5951146d 3870 if (!sgl || !sgl_count)
c66ac9db 3871 return 0;
c66ac9db 3872
c66ac9db
NB		 3873 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3874 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
c66ac9db 3875
ec98f782
AG		 3876 cmd->t_data_sg = sgl;
3877 cmd->t_data_nents = sgl_count;
c66ac9db 3878
ec98f782
AG		 3879 if (sgl_bidi && sgl_bidi_count) {
3880 cmd->t_bidi_data_sg = sgl_bidi;
3881 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3882 }
3883 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3884 }
3885
3886 return 0;
3887}
3888EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3889
c66ac9db
NB		 3890static int transport_new_cmd_obj(struct se_cmd *cmd)
3891{
5951146d 3892 struct se_device *dev = cmd->se_dev;
01cde4d5 3893 int set_counts = 1, rc, task_cdbs;
c66ac9db 3894
ec98f782
AG		 3895 /*
3896 * Setup any BIDI READ tasks and memory from
3897 * cmd->t_mem_bidi_list so the READ struct se_tasks
3898 * are queued first for the non pSCSI passthrough case.
3899 */
3900 if (cmd->t_bidi_data_sg &&
3901 (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) {
3902 rc = transport_allocate_tasks(cmd,
3903 cmd->t_task_lba,
3904 DMA_FROM_DEVICE,
3905 cmd->t_bidi_data_sg,
3906 cmd->t_bidi_data_nents);
6708bb27 3907 if (rc <= 0) {
c66ac9db
NB		 3908 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3909 cmd->scsi_sense_reason =
ec98f782 3910 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
01cde4d5 3911 return -EINVAL;
c66ac9db 3912 }
ec98f782
AG		 3913 atomic_inc(&cmd->t_fe_count);
3914 atomic_inc(&cmd->t_se_count);
3915 set_counts = 0;
3916 }
3917 /*
3918 * Setup the tasks and memory from cmd->t_mem_list
3919 * Note for BIDI transfers this will contain the WRITE payload
3920 */
3921 task_cdbs = transport_allocate_tasks(cmd,
3922 cmd->t_task_lba,
3923 cmd->data_direction,
3924 cmd->t_data_sg,
3925 cmd->t_data_nents);
6708bb27 3926 if (task_cdbs <= 0) {
ec98f782
AG		 3927 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3928 cmd->scsi_sense_reason =
3929 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
01cde4d5 3930 return -EINVAL;
ec98f782 3931 }
c66ac9db 3932
ec98f782
AG		 3933 if (set_counts) {
3934 atomic_inc(&cmd->t_fe_count);
3935 atomic_inc(&cmd->t_se_count);
c66ac9db
NB		 3936 }
3937
ec98f782
AG		 3938 cmd->t_task_list_num = task_cdbs;
3939
a1d8b49a
AG		 3940 atomic_set(&cmd->t_task_cdbs_left, task_cdbs);
3941 atomic_set(&cmd->t_task_cdbs_ex_left, task_cdbs);
3942 atomic_set(&cmd->t_task_cdbs_timeout_left, task_cdbs);
c66ac9db
NB		 3943 return 0;
3944}
3945
05d1c7c0
AG		 3946void *transport_kmap_first_data_page(struct se_cmd *cmd)
3947{
ec98f782 3948 struct scatterlist *sg = cmd->t_data_sg;
05d1c7c0 3949
ec98f782 3950 BUG_ON(!sg);
05d1c7c0 3951 /*
ec98f782
AG		 3952 * We need to take into account a possible offset here for fabrics like
3953 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3954 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3955 */
ec98f782 3956 return kmap(sg_page(sg)) + sg->offset;
05d1c7c0
AG		 3957}
3958EXPORT_SYMBOL(transport_kmap_first_data_page);
3959
3960void transport_kunmap_first_data_page(struct se_cmd *cmd)
3961{
ec98f782 3962 kunmap(sg_page(cmd->t_data_sg));
05d1c7c0
AG		 3963}
3964EXPORT_SYMBOL(transport_kunmap_first_data_page);
3965
c66ac9db 3966static int
05d1c7c0 3967transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3968{
ec98f782
AG		 3969 u32 length = cmd->data_length;
3970 unsigned int nents;
3971 struct page *page;
3972 int i = 0;
c66ac9db 3973
ec98f782
AG		 3974 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3975 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3976 if (!cmd->t_data_sg)
3977 return -ENOMEM;
c66ac9db 3978
ec98f782
AG		 3979 cmd->t_data_nents = nents;
3980 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3981
ec98f782
AG		 3982 while (length) {
3983 u32 page_len = min_t(u32, length, PAGE_SIZE);
3984 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3985 if (!page)
3986 goto out;
c66ac9db 3987
ec98f782
AG		 3988 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3989 length -= page_len;
3990 i++;
c66ac9db 3991 }
c66ac9db 3992 return 0;
c66ac9db 3993
ec98f782
AG		 3994out:
3995 while (i >= 0) {
3996 __free_page(sg_page(&cmd->t_data_sg[i]));
3997 i--;
c66ac9db 3998 }
ec98f782
AG		 3999 kfree(cmd->t_data_sg);
4000 cmd->t_data_sg = NULL;
4001 return -ENOMEM;
c66ac9db
NB		 4002}
4003
a1d8b49a
AG		 4004/* Reduce sectors if they are too long for the device */
4005static inline sector_t transport_limit_task_sectors(
c66ac9db
NB		 4006 struct se_device *dev,
4007 unsigned long long lba,
a1d8b49a 4008 sector_t sectors)
c66ac9db 4009{
a1d8b49a 4010 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db 4011
a1d8b49a
AG		 4012 if (dev->transport->get_device_type(dev) == TYPE_DISK)
4013 if ((lba + sectors) > transport_dev_end_lba(dev))
4014 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
c66ac9db 4015
a1d8b49a 4016 return sectors;
c66ac9db
NB		 4017}
4018
c66ac9db
NB		 4019
4020/*
4021 * This function can be used by HW target mode drivers to create a linked
4022 * scatterlist from all contiguously allocated struct se_task->task_sg[].
4023 * This is intended to be called during the completion path by TCM Core
4024 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
4025 */
4026void transport_do_task_sg_chain(struct se_cmd *cmd)
4027{
ec98f782
AG		 4028 struct scatterlist *sg_first = NULL;
4029 struct scatterlist *sg_prev = NULL;
4030 int sg_prev_nents = 0;
4031 struct scatterlist *sg;
c66ac9db 4032 struct se_task *task;
ec98f782 4033 u32 chained_nents = 0;
c66ac9db
NB		 4034 int i;
4035
ec98f782
AG		 4036 BUG_ON(!cmd->se_tfo->task_sg_chaining);
4037
c66ac9db
NB		 4038 /*
4039 * Walk the struct se_task list and setup scatterlist chains
a1d8b49a 4040 * for each contiguously allocated struct se_task->task_sg[].
c66ac9db 4041 */
a1d8b49a 4042 list_for_each_entry(task, &cmd->t_task_list, t_list) {
ec98f782 4043 if (!task->task_sg)
c66ac9db
NB		 4044 continue;
4045
ec98f782
AG		 4046 if (!sg_first) {
4047 sg_first = task->task_sg;
6708bb27 4048 chained_nents = task->task_sg_nents;
97868c89 4049 } else {
ec98f782 4050 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
6708bb27 4051 chained_nents += task->task_sg_nents;
97868c89 4052 }
c3c74c7a
NB		 4053 /*
4054 * For the padded tasks, use the extra SGL vector allocated
4055 * in transport_allocate_data_tasks() for the sg_prev_nents
4056 * offset into sg_chain() above.. The last task of a
4057 * multi-task list, or a single task will not have
4058 * task->task_sg_padded set..
4059 */
4060 if (task->task_padded_sg)
4061 sg_prev_nents = (task->task_sg_nents + 1);
4062 else
4063 sg_prev_nents = task->task_sg_nents;
ec98f782
AG		 4064
4065 sg_prev = task->task_sg;
c66ac9db
NB		 4066 }
4067 /*
4068 * Setup the starting pointer and total t_tasks_sg_linked_no including
4069 * padding SGs for linking and to mark the end.
4070 */
a1d8b49a 4071 cmd->t_tasks_sg_chained = sg_first;
ec98f782 4072 cmd->t_tasks_sg_chained_no = chained_nents;
c66ac9db 4073
6708bb27 4074 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
a1d8b49a
AG		 4075 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
4076 cmd->t_tasks_sg_chained_no);
c66ac9db 4077
a1d8b49a
AG		 4078 for_each_sg(cmd->t_tasks_sg_chained, sg,
4079 cmd->t_tasks_sg_chained_no, i) {
c66ac9db 4080
6708bb27 4081 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
5951146d 4082 i, sg, sg_page(sg), sg->length, sg->offset);
c66ac9db 4083 if (sg_is_chain(sg))
6708bb27 4084 pr_debug("SG: %p sg_is_chain=1\n", sg);
c66ac9db 4085 if (sg_is_last(sg))
6708bb27 4086 pr_debug("SG: %p sg_is_last=1\n", sg);
c66ac9db 4087 }
c66ac9db
NB		 4088}
4089EXPORT_SYMBOL(transport_do_task_sg_chain);
4090
a1d8b49a
AG		 4091/*
4092 * Break up cmd into chunks transport can handle
4093 */
ec98f782 4094static int transport_allocate_data_tasks(
c66ac9db
NB		 4095 struct se_cmd *cmd,
4096 unsigned long long lba,
c66ac9db 4097 enum dma_data_direction data_direction,
ec98f782
AG		 4098 struct scatterlist *sgl,
4099 unsigned int sgl_nents)
c66ac9db
NB		 4100{
4101 unsigned char *cdb = NULL;
4102 struct se_task *task;
5951146d 4103 struct se_device *dev = cmd->se_dev;
ec98f782 4104 unsigned long flags;
1d20bb61 4105 int task_count, i, ret;
277c5f27 4106 sector_t sectors, dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
ec98f782
AG		 4107 u32 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
4108 struct scatterlist *sg;
4109 struct scatterlist *cmd_sg;
a1d8b49a 4110
ec98f782
AG		 4111 WARN_ON(cmd->data_length % sector_size);
4112 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
277c5f27
NB		 4113 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
4114
ec98f782
AG		 4115 cmd_sg = sgl;
4116 for (i = 0; i < task_count; i++) {
c3c74c7a 4117 unsigned int task_size, task_sg_nents_padded;
ec98f782 4118 int count;
a1d8b49a 4119
c66ac9db 4120 task = transport_generic_get_task(cmd, data_direction);
a1d8b49a 4121 if (!task)
ec98f782 4122 return -ENOMEM;
c66ac9db 4123
c66ac9db 4124 task->task_lba = lba;
ec98f782
AG		 4125 task->task_sectors = min(sectors, dev_max_sectors);
4126 task->task_size = task->task_sectors * sector_size;
c66ac9db 4127
e3d6f909 4128 cdb = dev->transport->get_cdb(task);
a1d8b49a
AG		 4129 BUG_ON(!cdb);
4130
4131 memcpy(cdb, cmd->t_task_cdb,
4132 scsi_command_size(cmd->t_task_cdb));
4133
4134 /* Update new cdb with updated lba/sectors */
3a867205 4135 cmd->transport_split_cdb(task->task_lba, task->task_sectors, cdb);
525a48a2
NB		 4136 /*
4137 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
4138 * in order to calculate the number per task SGL entries
4139 */
4140 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
c66ac9db 4141 /*
ec98f782
AG		 4142 * Check if the fabric module driver is requesting that all
4143 * struct se_task->task_sg[] be chained together.. If so,
4144 * then allocate an extra padding SG entry for linking and
c3c74c7a
NB		 4145 * marking the end of the chained SGL for every task except
4146 * the last one for (task_count > 1) operation, or skipping
4147 * the extra padding for the (task_count == 1) case.
c66ac9db 4148 */
c3c74c7a
NB		 4149 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
4150 task_sg_nents_padded = (task->task_sg_nents + 1);
ec98f782 4151 task->task_padded_sg = 1;
c3c74c7a
NB		 4152 } else
4153 task_sg_nents_padded = task->task_sg_nents;
c66ac9db 4154
1d20bb61 4155 task->task_sg = kmalloc(sizeof(struct scatterlist) *
c3c74c7a 4156 task_sg_nents_padded, GFP_KERNEL);
ec98f782
AG		 4157 if (!task->task_sg) {
4158 cmd->se_dev->transport->free_task(task);
4159 return -ENOMEM;
4160 }
4161
c3c74c7a 4162 sg_init_table(task->task_sg, task_sg_nents_padded);
c66ac9db 4163
ec98f782
AG		 4164 task_size = task->task_size;
4165
4166 /* Build new sgl, only up to task_size */
6708bb27 4167 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
ec98f782
AG		 4168 if (cmd_sg->length > task_size)
4169 break;
4170
4171 *sg = *cmd_sg;
4172 task_size -= cmd_sg->length;
4173 cmd_sg = sg_next(cmd_sg);
c66ac9db 4174 }
c66ac9db 4175
ec98f782
AG		 4176 lba += task->task_sectors;
4177 sectors -= task->task_sectors;
c66ac9db 4178
ec98f782
AG		 4179 spin_lock_irqsave(&cmd->t_state_lock, flags);
4180 list_add_tail(&task->t_list, &cmd->t_task_list);
4181 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4182 }
1d20bb61
NB		 4183 /*
4184 * Now perform the memory map of task->task_sg[] into backend
4185 * subsystem memory..
4186 */
4187 list_for_each_entry(task, &cmd->t_task_list, t_list) {
4188 if (atomic_read(&task->task_sent))
4189 continue;
4190 if (!dev->transport->map_data_SG)
4191 continue;
4192
4193 ret = dev->transport->map_data_SG(task);
4194 if (ret < 0)
4195 return 0;
4196 }
c66ac9db 4197
ec98f782 4198 return task_count;
c66ac9db
NB		 4199}
4200
4201static int
ec98f782 4202transport_allocate_control_task(struct se_cmd *cmd)
c66ac9db 4203{
5951146d 4204 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4205 unsigned char *cdb;
4206 struct se_task *task;
ec98f782 4207 unsigned long flags;
6708bb27 4208 int ret = 0;
c66ac9db
NB		 4209
4210 task = transport_generic_get_task(cmd, cmd->data_direction);
4211 if (!task)
ec98f782 4212 return -ENOMEM;
c66ac9db 4213
e3d6f909 4214 cdb = dev->transport->get_cdb(task);
a1d8b49a
AG		 4215 BUG_ON(!cdb);
4216 memcpy(cdb, cmd->t_task_cdb,
4217 scsi_command_size(cmd->t_task_cdb));
c66ac9db 4218
ec98f782
AG		 4219 task->task_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
4220 GFP_KERNEL);
4221 if (!task->task_sg) {
4222 cmd->se_dev->transport->free_task(task);
4223 return -ENOMEM;
4224 }
4225
4226 memcpy(task->task_sg, cmd->t_data_sg,
4227 sizeof(struct scatterlist) * cmd->t_data_nents);
c66ac9db 4228 task->task_size = cmd->data_length;
6708bb27 4229 task->task_sg_nents = cmd->t_data_nents;
c66ac9db 4230
ec98f782
AG		 4231 spin_lock_irqsave(&cmd->t_state_lock, flags);
4232 list_add_tail(&task->t_list, &cmd->t_task_list);
4233 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4234
4235 if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) {
1d20bb61
NB		 4236 if (dev->transport->map_control_SG)
4237 ret = dev->transport->map_control_SG(task);
c66ac9db
NB		 4238 } else if (cmd->se_cmd_flags & SCF_SCSI_NON_DATA_CDB) {
4239 if (dev->transport->cdb_none)
6708bb27 4240 ret = dev->transport->cdb_none(task);
c66ac9db 4241 } else {
6708bb27 4242 pr_err("target: Unknown control cmd type!\n");
c66ac9db 4243 BUG();
ec98f782 4244 }
6708bb27
AG		 4245
4246 /* Success! Return number of tasks allocated */
4247 if (ret == 0)
4248 return 1;
4249 return ret;
ec98f782
AG		 4250}
4251
4252static u32 transport_allocate_tasks(
4253 struct se_cmd *cmd,
4254 unsigned long long lba,
4255 enum dma_data_direction data_direction,
4256 struct scatterlist *sgl,
4257 unsigned int sgl_nents)
4258{
01cde4d5
NB		 4259 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
4260 if (transport_cmd_get_valid_sectors(cmd) < 0)
4261 return -EINVAL;
4262
ec98f782
AG		 4263 return transport_allocate_data_tasks(cmd, lba, data_direction,
4264 sgl, sgl_nents);
01cde4d5 4265 } else
6708bb27
AG		 4266 return transport_allocate_control_task(cmd);
4267
c66ac9db
NB		 4268}
4269
ec98f782 4270
c66ac9db
NB		 4271/* transport_generic_new_cmd(): Called from transport_processing_thread()
4272 *
4273 * Allocate storage transport resources from a set of values predefined
4274 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4275 * Any non zero return here is treated as an "out of resource' op here.
4276 */
4277 /*
4278 * Generate struct se_task(s) and/or their payloads for this CDB.
4279 */
a1d8b49a 4280int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 4281{
c66ac9db
NB		 4282 int ret = 0;
4283
4284 /*
4285 * Determine is the TCM fabric module has already allocated physical
4286 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 4287 * beforehand.
c66ac9db 4288 */
ec98f782
AG		 4289 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
4290 cmd->data_length) {
05d1c7c0 4291 ret = transport_generic_get_mem(cmd);
c66ac9db
NB		 4292 if (ret < 0)
4293 return ret;
4294 }
1d20bb61
NB		 4295 /*
4296 * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4297 * control or data CDB types, and perform the map to backend subsystem
4298 * code from SGL memory allocated here by transport_generic_get_mem(), or
4299 * via pre-existing SGL memory setup explictly by fabric module code with
4300 * transport_generic_map_mem_to_cmd().
4301 */
c66ac9db
NB		 4302 ret = transport_new_cmd_obj(cmd);
4303 if (ret < 0)
4304 return ret;
c66ac9db 4305 /*
a1d8b49a 4306 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 4307 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4308 * will be added to the struct se_device execution queue after its WRITE
4309 * data has arrived. (ie: It gets handled by the transport processing
4310 * thread a second time)
4311 */
4312 if (cmd->data_direction == DMA_TO_DEVICE) {
4313 transport_add_tasks_to_state_queue(cmd);
4314 return transport_generic_write_pending(cmd);
4315 }
4316 /*
4317 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4318 * to the execution queue.
4319 */
4320 transport_execute_tasks(cmd);
4321 return 0;
4322}
a1d8b49a 4323EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 4324
4325/* transport_generic_process_write():
4326 *
4327 *
4328 */
4329void transport_generic_process_write(struct se_cmd *cmd)
4330{
c66ac9db
NB		 4331 transport_execute_tasks(cmd);
4332}
4333EXPORT_SYMBOL(transport_generic_process_write);
4334
07bde79a
NB		 4335static int transport_write_pending_qf(struct se_cmd *cmd)
4336{
4337 return cmd->se_tfo->write_pending(cmd);
4338}
4339
c66ac9db
NB		 4340/* transport_generic_write_pending():
4341 *
4342 *
4343 */
4344static int transport_generic_write_pending(struct se_cmd *cmd)
4345{
4346 unsigned long flags;
4347 int ret;
4348
a1d8b49a 4349 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4350 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 4351 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a
NB		 4352
4353 if (cmd->transport_qf_callback) {
4354 ret = cmd->transport_qf_callback(cmd);
4355 if (ret == -EAGAIN)
4356 goto queue_full;
4357 else if (ret < 0)
4358 return ret;
4359
4360 cmd->transport_qf_callback = NULL;
4361 return 0;
4362 }
05d1c7c0 4363
c66ac9db
NB		 4364 /*
4365 * Clear the se_cmd for WRITE_PENDING status in order to set
a1d8b49a 4366 * cmd->t_transport_active=0 so that transport_generic_handle_data
c66ac9db 4367 * can be called from HW target mode interrupt code. This is safe
e3d6f909 4368 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 4369 * because the se_cmd->se_lun pointer is not being cleared.
4370 */
4371 transport_cmd_check_stop(cmd, 1, 0);
4372
4373 /*
4374 * Call the fabric write_pending function here to let the
4375 * frontend know that WRITE buffers are ready.
4376 */
e3d6f909 4377 ret = cmd->se_tfo->write_pending(cmd);
07bde79a
NB		 4378 if (ret == -EAGAIN)
4379 goto queue_full;
4380 else if (ret < 0)
c66ac9db
NB		 4381 return ret;
4382
4383 return PYX_TRANSPORT_WRITE_PENDING;
07bde79a
NB		 4384
4385queue_full:
6708bb27 4386 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a
NB		 4387 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
4388 transport_handle_queue_full(cmd, cmd->se_dev,
4389 transport_write_pending_qf);
4390 return ret;
c66ac9db
NB		 4391}
4392
35462975 4393void transport_release_cmd(struct se_cmd *cmd)
c66ac9db 4394{
e3d6f909 4395 BUG_ON(!cmd->se_tfo);
c66ac9db
NB		 4396
4397 transport_free_se_cmd(cmd);
35462975 4398 cmd->se_tfo->release_cmd(cmd);
c66ac9db 4399}
35462975 4400EXPORT_SYMBOL(transport_release_cmd);
c66ac9db
NB		 4401
4402/* transport_generic_free_cmd():
4403 *
4404 * Called from processing frontend to release storage engine resources
4405 */
4406void transport_generic_free_cmd(
4407 struct se_cmd *cmd,
4408 int wait_for_tasks,
c66ac9db
NB		 4409 int session_reinstatement)
4410{
5951146d 4411 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD))
35462975 4412 transport_release_cmd(cmd);
c66ac9db
NB		 4413 else {
4414 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
4415
e3d6f909 4416 if (cmd->se_lun) {
c66ac9db 4417#if 0
6708bb27 4418 pr_debug("cmd: %p ITT: 0x%08x contains"
e3d6f909
AG		 4419 " cmd->se_lun\n", cmd,
4420 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4421#endif
4422 transport_lun_remove_cmd(cmd);
4423 }
4424
4425 if (wait_for_tasks && cmd->transport_wait_for_tasks)
4426 cmd->transport_wait_for_tasks(cmd, 0, 0);
4427
f4366772
NB		 4428 transport_free_dev_tasks(cmd);
4429
35462975 4430 transport_generic_remove(cmd, session_reinstatement);
c66ac9db
NB		 4431 }
4432}
4433EXPORT_SYMBOL(transport_generic_free_cmd);
4434
4435static void transport_nop_wait_for_tasks(
4436 struct se_cmd *cmd,
4437 int remove_cmd,
4438 int session_reinstatement)
4439{
4440 return;
4441}
4442
4443/* transport_lun_wait_for_tasks():
4444 *
4445 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4446 * an struct se_lun to be successfully shutdown.
4447 */
4448static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4449{
4450 unsigned long flags;
4451 int ret;
4452 /*
4453 * If the frontend has already requested this struct se_cmd to
4454 * be stopped, we can safely ignore this struct se_cmd.
4455 */
a1d8b49a
AG		 4456 spin_lock_irqsave(&cmd->t_state_lock, flags);
4457 if (atomic_read(&cmd->t_transport_stop)) {
4458 atomic_set(&cmd->transport_lun_stop, 0);
6708bb27 4459 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
e3d6f909 4460 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4461 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4462 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 4463 return -EPERM;
c66ac9db 4464 }
a1d8b49a
AG		 4465 atomic_set(&cmd->transport_lun_fe_stop, 1);
4466 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4467
5951146d 4468 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 4469
4470 ret = transport_stop_tasks_for_cmd(cmd);
4471
6708bb27
AG		 4472 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4473 " %d\n", cmd, cmd->t_task_list_num, ret);
c66ac9db 4474 if (!ret) {
6708bb27 4475 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 4476 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4477 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 4478 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 4479 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4480 }
5951146d 4481 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 4482
4483 return 0;
4484}
4485
c66ac9db
NB		 4486static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4487{
4488 struct se_cmd *cmd = NULL;
4489 unsigned long lun_flags, cmd_flags;
4490 /*
4491 * Do exception processing and return CHECK_CONDITION status to the
4492 * Initiator Port.
4493 */
4494 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 4495 while (!list_empty(&lun->lun_cmd_list)) {
4496 cmd = list_first_entry(&lun->lun_cmd_list,
4497 struct se_cmd, se_lun_node);
4498 list_del(&cmd->se_lun_node);
4499
a1d8b49a 4500 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db
NB		 4501 /*
4502 * This will notify iscsi_target_transport.c:
4503 * transport_cmd_check_stop() that a LUN shutdown is in
4504 * progress for the iscsi_cmd_t.
4505 */
a1d8b49a 4506 spin_lock(&cmd->t_state_lock);
6708bb27 4507 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 4508 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 4509 cmd->se_lun->unpacked_lun,
4510 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a
AG		 4511 atomic_set(&cmd->transport_lun_stop, 1);
4512 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 4513
4514 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4515
6708bb27
AG		 4516 if (!cmd->se_lun) {
4517 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 4518 cmd->se_tfo->get_task_tag(cmd),
4519 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 4520 BUG();
4521 }
4522 /*
4523 * If the Storage engine still owns the iscsi_cmd_t, determine
4524 * and/or stop its context.
4525 */
6708bb27 4526 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 4527 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4528 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4529
e3d6f909 4530 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 4531 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4532 continue;
4533 }
4534
6708bb27 4535 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 4536 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 4537 cmd->se_lun->unpacked_lun,
4538 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4539
a1d8b49a 4540 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
6708bb27 4541 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 4542 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4543 goto check_cond;
4544 }
a1d8b49a 4545 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 4546 transport_all_task_dev_remove_state(cmd);
a1d8b49a 4547 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4548
4549 transport_free_dev_tasks(cmd);
4550 /*
4551 * The Storage engine stopped this struct se_cmd before it was
4552 * send to the fabric frontend for delivery back to the
4553 * Initiator Node. Return this SCSI CDB back with an
4554 * CHECK_CONDITION status.
4555 */
4556check_cond:
4557 transport_send_check_condition_and_sense(cmd,
4558 TCM_NON_EXISTENT_LUN, 0);
4559 /*
4560 * If the fabric frontend is waiting for this iscsi_cmd_t to
4561 * be released, notify the waiting thread now that LU has
4562 * finished accessing it.
4563 */
a1d8b49a
AG		 4564 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4565 if (atomic_read(&cmd->transport_lun_fe_stop)) {
6708bb27 4566 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 4567 " struct se_cmd: %p ITT: 0x%08x\n",
4568 lun->unpacked_lun,
e3d6f909 4569 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4570
a1d8b49a 4571 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 4572 cmd_flags);
4573 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 4574 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 4575 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4576 continue;
4577 }
6708bb27 4578 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 4579 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4580
a1d8b49a 4581 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4582 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4583 }
4584 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4585}
4586
4587static int transport_clear_lun_thread(void *p)
4588{
4589 struct se_lun *lun = (struct se_lun *)p;
4590
4591 __transport_clear_lun_from_sessions(lun);
4592 complete(&lun->lun_shutdown_comp);
4593
4594 return 0;
4595}
4596
4597int transport_clear_lun_from_sessions(struct se_lun *lun)
4598{
4599 struct task_struct *kt;
4600
5951146d 4601 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 4602 "tcm_cl_%u", lun->unpacked_lun);
4603 if (IS_ERR(kt)) {
6708bb27 4604 pr_err("Unable to start clear_lun thread\n");
e3d6f909 4605 return PTR_ERR(kt);
c66ac9db
NB		 4606 }
4607 wait_for_completion(&lun->lun_shutdown_comp);
4608
4609 return 0;
4610}
4611
4612/* transport_generic_wait_for_tasks():
4613 *
4614 * Called from frontend or passthrough context to wait for storage engine
4615 * to pause and/or release frontend generated struct se_cmd.
4616 */
4617static void transport_generic_wait_for_tasks(
4618 struct se_cmd *cmd,
4619 int remove_cmd,
4620 int session_reinstatement)
4621{
4622 unsigned long flags;
4623
4624 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req))
4625 return;
4626
a1d8b49a 4627 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4628 /*
4629 * If we are already stopped due to an external event (ie: LUN shutdown)
4630 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 4631 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 4632 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4633 * has completed its operation on the struct se_cmd.
4634 */
a1d8b49a 4635 if (atomic_read(&cmd->transport_lun_stop)) {
c66ac9db 4636
6708bb27 4637 pr_debug("wait_for_tasks: Stopping"
e3d6f909 4638 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 4639 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 4640 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4641 /*
4642 * There is a special case for WRITES where a FE exception +
4643 * LUN shutdown means ConfigFS context is still sleeping on
4644 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4645 * We go ahead and up transport_lun_stop_comp just to be sure
4646 * here.
4647 */
a1d8b49a
AG		 4648 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4649 complete(&cmd->transport_lun_stop_comp);
4650 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4651 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4652
4653 transport_all_task_dev_remove_state(cmd);
4654 /*
4655 * At this point, the frontend who was the originator of this
4656 * struct se_cmd, now owns the structure and can be released through
4657 * normal means below.
4658 */
6708bb27 4659 pr_debug("wait_for_tasks: Stopped"
e3d6f909 4660 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 4661 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 4662 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4663
a1d8b49a 4664 atomic_set(&cmd->transport_lun_stop, 0);
c66ac9db 4665 }
a1d8b49a
AG		 4666 if (!atomic_read(&cmd->t_transport_active) ||
4667 atomic_read(&cmd->t_transport_aborted))
c66ac9db
NB		 4668 goto remove;
4669
a1d8b49a 4670 atomic_set(&cmd->t_transport_stop, 1);
c66ac9db 4671
6708bb27 4672 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
c66ac9db 4673 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
e3d6f909
AG		 4674 " = TRUE\n", cmd, cmd->se_tfo->get_task_tag(cmd),
4675 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
c66ac9db
NB		 4676 cmd->deferred_t_state);
4677
a1d8b49a 4678 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4679
5951146d 4680 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 4681
a1d8b49a 4682 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 4683
a1d8b49a
AG		 4684 spin_lock_irqsave(&cmd->t_state_lock, flags);
4685 atomic_set(&cmd->t_transport_active, 0);
4686 atomic_set(&cmd->t_transport_stop, 0);
c66ac9db 4687
6708bb27 4688 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4689 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4690 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4691remove:
a1d8b49a 4692 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4693 if (!remove_cmd)
4694 return;
4695
35462975 4696 transport_generic_free_cmd(cmd, 0, session_reinstatement);
c66ac9db
NB		 4697}
4698
4699static int transport_get_sense_codes(
4700 struct se_cmd *cmd,
4701 u8 *asc,
4702 u8 *ascq)
4703{
4704 *asc = cmd->scsi_asc;
4705 *ascq = cmd->scsi_ascq;
4706
4707 return 0;
4708}
4709
4710static int transport_set_sense_codes(
4711 struct se_cmd *cmd,
4712 u8 asc,
4713 u8 ascq)
4714{
4715 cmd->scsi_asc = asc;
4716 cmd->scsi_ascq = ascq;
4717
4718 return 0;
4719}
4720
4721int transport_send_check_condition_and_sense(
4722 struct se_cmd *cmd,
4723 u8 reason,
4724 int from_transport)
4725{
4726 unsigned char *buffer = cmd->sense_buffer;
4727 unsigned long flags;
4728 int offset;
4729 u8 asc = 0, ascq = 0;
4730
a1d8b49a 4731 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4732 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4733 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4734 return 0;
4735 }
4736 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4737 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4738
4739 if (!reason && from_transport)
4740 goto after_reason;
4741
4742 if (!from_transport)
4743 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4744 /*
4745 * Data Segment and SenseLength of the fabric response PDU.
4746 *
4747 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4748 * from include/scsi/scsi_cmnd.h
4749 */
e3d6f909 4750 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4751 TRANSPORT_SENSE_BUFFER);
4752 /*
4753 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4754 * SENSE KEY values from include/scsi/scsi.h
4755 */
4756 switch (reason) {
4757 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4758 /* CURRENT ERROR */
4759 buffer[offset] = 0x70;
4760 /* ILLEGAL REQUEST */
4761 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4762 /* LOGICAL UNIT NOT SUPPORTED */
4763 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4764 break;
c66ac9db
NB		 4765 case TCM_UNSUPPORTED_SCSI_OPCODE:
4766 case TCM_SECTOR_COUNT_TOO_MANY:
4767 /* CURRENT ERROR */
4768 buffer[offset] = 0x70;
4769 /* ILLEGAL REQUEST */
4770 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4771 /* INVALID COMMAND OPERATION CODE */
4772 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4773 break;
4774 case TCM_UNKNOWN_MODE_PAGE:
4775 /* CURRENT ERROR */
4776 buffer[offset] = 0x70;
4777 /* ILLEGAL REQUEST */
4778 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4779 /* INVALID FIELD IN CDB */
4780 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4781 break;
4782 case TCM_CHECK_CONDITION_ABORT_CMD:
4783 /* CURRENT ERROR */
4784 buffer[offset] = 0x70;
4785 /* ABORTED COMMAND */
4786 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4787 /* BUS DEVICE RESET FUNCTION OCCURRED */
4788 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4789 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4790 break;
4791 case TCM_INCORRECT_AMOUNT_OF_DATA:
4792 /* CURRENT ERROR */
4793 buffer[offset] = 0x70;
4794 /* ABORTED COMMAND */
4795 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4796 /* WRITE ERROR */
4797 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4798 /* NOT ENOUGH UNSOLICITED DATA */
4799 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4800 break;
4801 case TCM_INVALID_CDB_FIELD:
4802 /* CURRENT ERROR */
4803 buffer[offset] = 0x70;
4804 /* ABORTED COMMAND */
4805 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4806 /* INVALID FIELD IN CDB */
4807 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4808 break;
4809 case TCM_INVALID_PARAMETER_LIST:
4810 /* CURRENT ERROR */
4811 buffer[offset] = 0x70;
4812 /* ABORTED COMMAND */
4813 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4814 /* INVALID FIELD IN PARAMETER LIST */
4815 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4816 break;
4817 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4818 /* CURRENT ERROR */
4819 buffer[offset] = 0x70;
4820 /* ABORTED COMMAND */
4821 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4822 /* WRITE ERROR */
4823 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4824 /* UNEXPECTED_UNSOLICITED_DATA */
4825 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4826 break;
4827 case TCM_SERVICE_CRC_ERROR:
4828 /* CURRENT ERROR */
4829 buffer[offset] = 0x70;
4830 /* ABORTED COMMAND */
4831 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4832 /* PROTOCOL SERVICE CRC ERROR */
4833 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4834 /* N/A */
4835 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4836 break;
4837 case TCM_SNACK_REJECTED:
4838 /* CURRENT ERROR */
4839 buffer[offset] = 0x70;
4840 /* ABORTED COMMAND */
4841 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4842 /* READ ERROR */
4843 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4844 /* FAILED RETRANSMISSION REQUEST */
4845 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4846 break;
4847 case TCM_WRITE_PROTECTED:
4848 /* CURRENT ERROR */
4849 buffer[offset] = 0x70;
4850 /* DATA PROTECT */
4851 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4852 /* WRITE PROTECTED */
4853 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4854 break;
4855 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4856 /* CURRENT ERROR */
4857 buffer[offset] = 0x70;
4858 /* UNIT ATTENTION */
4859 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4860 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4861 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4862 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4863 break;
4864 case TCM_CHECK_CONDITION_NOT_READY:
4865 /* CURRENT ERROR */
4866 buffer[offset] = 0x70;
4867 /* Not Ready */
4868 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4869 transport_get_sense_codes(cmd, &asc, &ascq);
4870 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4871 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4872 break;
4873 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4874 default:
4875 /* CURRENT ERROR */
4876 buffer[offset] = 0x70;
4877 /* ILLEGAL REQUEST */
4878 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4879 /* LOGICAL UNIT COMMUNICATION FAILURE */
4880 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4881 break;
4882 }
4883 /*
4884 * This code uses linux/include/scsi/scsi.h SAM status codes!
4885 */
4886 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4887 /*
4888 * Automatically padded, this value is encoded in the fabric's
4889 * data_length response PDU containing the SCSI defined sense data.
4890 */
4891 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4892
4893after_reason:
07bde79a 4894 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4895}
4896EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4897
4898int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4899{
4900 int ret = 0;
4901
a1d8b49a 4902 if (atomic_read(&cmd->t_transport_aborted) != 0) {
6708bb27 4903 if (!send_status ||
c66ac9db
NB		 4904 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4905 return 1;
4906#if 0
6708bb27 4907 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4908 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4909 cmd->t_task_cdb[0],
e3d6f909 4910 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4911#endif
4912 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4913 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4914 ret = 1;
4915 }
4916 return ret;
4917}
4918EXPORT_SYMBOL(transport_check_aborted_status);
4919
4920void transport_send_task_abort(struct se_cmd *cmd)
4921{
4922 /*
4923 * If there are still expected incoming fabric WRITEs, we wait
4924 * until until they have completed before sending a TASK_ABORTED
4925 * response. This response with TASK_ABORTED status will be
4926 * queued back to fabric module by transport_check_aborted_status().
4927 */
4928 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4929 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
a1d8b49a 4930 atomic_inc(&cmd->t_transport_aborted);
c66ac9db
NB		 4931 smp_mb__after_atomic_inc();
4932 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4933 transport_new_cmd_failure(cmd);
4934 return;
4935 }
4936 }
4937 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4938#if 0
6708bb27 4939 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4940 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4941 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4942#endif
e3d6f909 4943 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4944}
4945
4946/* transport_generic_do_tmr():
4947 *
4948 *
4949 */
4950int transport_generic_do_tmr(struct se_cmd *cmd)
4951{
5951146d 4952 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4953 struct se_tmr_req *tmr = cmd->se_tmr_req;
4954 int ret;
4955
4956 switch (tmr->function) {
5c6cd613 4957 case TMR_ABORT_TASK:
c66ac9db
NB		 4958 tmr->response = TMR_FUNCTION_REJECTED;
4959 break;
5c6cd613
NB		 4960 case TMR_ABORT_TASK_SET:
4961 case TMR_CLEAR_ACA:
4962 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4963 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4964 break;
5c6cd613 4965 case TMR_LUN_RESET:
c66ac9db
NB		 4966 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4967 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4968 TMR_FUNCTION_REJECTED;
4969 break;
5c6cd613 4970 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4971 tmr->response = TMR_FUNCTION_REJECTED;
4972 break;
5c6cd613 4973 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4974 tmr->response = TMR_FUNCTION_REJECTED;
4975 break;
c66ac9db 4976 default:
6708bb27 4977 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4978 tmr->function);
4979 tmr->response = TMR_FUNCTION_REJECTED;
4980 break;
4981 }
4982
4983 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4984 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db
NB		 4985
4986 transport_cmd_check_stop(cmd, 2, 0);
4987 return 0;
4988}
4989
4990/*
4991 * Called with spin_lock_irq(&dev->execute_task_lock); held
4992 *
4993 */
4994static struct se_task *
4995transport_get_task_from_state_list(struct se_device *dev)
4996{
4997 struct se_task *task;
4998
4999 if (list_empty(&dev->state_task_list))
5000 return NULL;
5001
5002 list_for_each_entry(task, &dev->state_task_list, t_state_list)
5003 break;
5004
5005 list_del(&task->t_state_list);
5006 atomic_set(&task->task_state_active, 0);
5007
5008 return task;
5009}
5010
5011static void transport_processing_shutdown(struct se_device *dev)
5012{
5013 struct se_cmd *cmd;
c66ac9db 5014 struct se_task *task;
c66ac9db
NB		 5015 unsigned long flags;
5016 /*
5017 * Empty the struct se_device's struct se_task state list.
5018 */
5019 spin_lock_irqsave(&dev->execute_task_lock, flags);
5020 while ((task = transport_get_task_from_state_list(dev))) {
e3d6f909 5021 if (!task->task_se_cmd) {
6708bb27 5022 pr_err("task->task_se_cmd is NULL!\n");
c66ac9db
NB		 5023 continue;
5024 }
e3d6f909 5025 cmd = task->task_se_cmd;
c66ac9db 5026
c66ac9db
NB		 5027 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
5028
a1d8b49a 5029 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 5030
6708bb27
AG		 5031 pr_debug("PT: cmd: %p task: %p ITT: 0x%08x,"
5032 " i_state: %d, t_state/def_t_state:"
c66ac9db 5033 " %d/%d cdb: 0x%02x\n", cmd, task,
6708bb27
AG		 5034 cmd->se_tfo->get_task_tag(cmd),
5035 cmd->se_tfo->get_cmd_state(cmd),
c66ac9db 5036 cmd->t_state, cmd->deferred_t_state,
a1d8b49a 5037 cmd->t_task_cdb[0]);
6708bb27 5038 pr_debug("PT: ITT[0x%08x] - t_tasks: %d t_task_cdbs_left:"
c66ac9db
NB		 5039 " %d t_task_cdbs_sent: %d -- t_transport_active: %d"
5040 " t_transport_stop: %d t_transport_sent: %d\n",
e3d6f909 5041 cmd->se_tfo->get_task_tag(cmd),
6708bb27 5042 cmd->t_task_list_num,
a1d8b49a
AG		 5043 atomic_read(&cmd->t_task_cdbs_left),
5044 atomic_read(&cmd->t_task_cdbs_sent),
5045 atomic_read(&cmd->t_transport_active),
5046 atomic_read(&cmd->t_transport_stop),
5047 atomic_read(&cmd->t_transport_sent));
c66ac9db
NB		 5048
5049 if (atomic_read(&task->task_active)) {
5050 atomic_set(&task->task_stop, 1);
5051 spin_unlock_irqrestore(
a1d8b49a 5052 &cmd->t_state_lock, flags);
c66ac9db 5053
6708bb27 5054 pr_debug("Waiting for task: %p to shutdown for dev:"
c66ac9db
NB		 5055 " %p\n", task, dev);
5056 wait_for_completion(&task->task_stop_comp);
6708bb27 5057 pr_debug("Completed task: %p shutdown for dev: %p\n",
c66ac9db
NB		 5058 task, dev);
5059
a1d8b49a
AG		 5060 spin_lock_irqsave(&cmd->t_state_lock, flags);
5061 atomic_dec(&cmd->t_task_cdbs_left);
c66ac9db
NB		 5062
5063 atomic_set(&task->task_active, 0);
5064 atomic_set(&task->task_stop, 0);
52208ae3
NB		 5065 } else {
5066 if (atomic_read(&task->task_execute_queue) != 0)
5067 transport_remove_task_from_execute_queue(task, dev);
c66ac9db
NB		 5068 }
5069 __transport_stop_task_timer(task, &flags);
5070
6708bb27 5071 if (!atomic_dec_and_test(&cmd->t_task_cdbs_ex_left)) {
c66ac9db 5072 spin_unlock_irqrestore(
a1d8b49a 5073 &cmd->t_state_lock, flags);
c66ac9db 5074
6708bb27 5075 pr_debug("Skipping task: %p, dev: %p for"
c66ac9db 5076 " t_task_cdbs_ex_left: %d\n", task, dev,
a1d8b49a 5077 atomic_read(&cmd->t_task_cdbs_ex_left));
c66ac9db
NB		 5078
5079 spin_lock_irqsave(&dev->execute_task_lock, flags);
5080 continue;
5081 }
5082
a1d8b49a 5083 if (atomic_read(&cmd->t_transport_active)) {
6708bb27 5084 pr_debug("got t_transport_active = 1 for task: %p, dev:"
c66ac9db
NB		 5085 " %p\n", task, dev);
5086
a1d8b49a 5087 if (atomic_read(&cmd->t_fe_count)) {
c66ac9db 5088 spin_unlock_irqrestore(
a1d8b49a 5089 &cmd->t_state_lock, flags);
c66ac9db
NB		 5090 transport_send_check_condition_and_sense(
5091 cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE,
5092 0);
5093 transport_remove_cmd_from_queue(cmd,
5951146d 5094 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5095
5096 transport_lun_remove_cmd(cmd);
5097 transport_cmd_check_stop(cmd, 1, 0);
5098 } else {
5099 spin_unlock_irqrestore(
a1d8b49a 5100 &cmd->t_state_lock, flags);
c66ac9db
NB		 5101
5102 transport_remove_cmd_from_queue(cmd,
5951146d 5103 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5104
5105 transport_lun_remove_cmd(cmd);
5106
5107 if (transport_cmd_check_stop(cmd, 1, 0))
35462975 5108 transport_generic_remove(cmd, 0);
c66ac9db
NB		 5109 }
5110
5111 spin_lock_irqsave(&dev->execute_task_lock, flags);
5112 continue;
5113 }
6708bb27 5114 pr_debug("Got t_transport_active = 0 for task: %p, dev: %p\n",
c66ac9db
NB		 5115 task, dev);
5116
a1d8b49a 5117 if (atomic_read(&cmd->t_fe_count)) {
c66ac9db 5118 spin_unlock_irqrestore(
a1d8b49a 5119 &cmd->t_state_lock, flags);
c66ac9db
NB		 5120 transport_send_check_condition_and_sense(cmd,
5121 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
5122 transport_remove_cmd_from_queue(cmd,
5951146d 5123 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5124
5125 transport_lun_remove_cmd(cmd);
5126 transport_cmd_check_stop(cmd, 1, 0);
5127 } else {
5128 spin_unlock_irqrestore(
a1d8b49a 5129 &cmd->t_state_lock, flags);
c66ac9db
NB		 5130
5131 transport_remove_cmd_from_queue(cmd,
5951146d 5132 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5133 transport_lun_remove_cmd(cmd);
5134
5135 if (transport_cmd_check_stop(cmd, 1, 0))
35462975 5136 transport_generic_remove(cmd, 0);
c66ac9db
NB		 5137 }
5138
5139 spin_lock_irqsave(&dev->execute_task_lock, flags);
5140 }
5141 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
5142 /*
5143 * Empty the struct se_device's struct se_cmd list.
5144 */
5951146d 5145 while ((cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj))) {
c66ac9db 5146
6708bb27 5147 pr_debug("From Device Queue: cmd: %p t_state: %d\n",
5951146d 5148 cmd, cmd->t_state);
c66ac9db 5149
a1d8b49a 5150 if (atomic_read(&cmd->t_fe_count)) {
c66ac9db
NB		 5151 transport_send_check_condition_and_sense(cmd,
5152 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
5153
5154 transport_lun_remove_cmd(cmd);
5155 transport_cmd_check_stop(cmd, 1, 0);
5156 } else {
5157 transport_lun_remove_cmd(cmd);
5158 if (transport_cmd_check_stop(cmd, 1, 0))
35462975 5159 transport_generic_remove(cmd, 0);
c66ac9db 5160 }
c66ac9db 5161 }
c66ac9db
NB		 5162}
5163
5164/* transport_processing_thread():
5165 *
5166 *
5167 */
5168static int transport_processing_thread(void *param)
5169{
5951146d 5170 int ret;
c66ac9db
NB		 5171 struct se_cmd *cmd;
5172 struct se_device *dev = (struct se_device *) param;
c66ac9db
NB		 5173
5174 set_user_nice(current, -20);
5175
5176 while (!kthread_should_stop()) {
e3d6f909
AG		 5177 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
5178 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 5179 kthread_should_stop());
5180 if (ret < 0)
5181 goto out;
5182
5183 spin_lock_irq(&dev->dev_status_lock);
5184 if (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) {
5185 spin_unlock_irq(&dev->dev_status_lock);
5186 transport_processing_shutdown(dev);
5187 continue;
5188 }
5189 spin_unlock_irq(&dev->dev_status_lock);
5190
5191get_cmd:
5192 __transport_execute_tasks(dev);
5193
5951146d
AG		 5194 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
5195 if (!cmd)
c66ac9db
NB		 5196 continue;
5197
5951146d 5198 switch (cmd->t_state) {
c66ac9db 5199 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 5200 if (!cmd->se_tfo->new_cmd_map) {
5201 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 5202 " NULL for TRANSPORT_NEW_CMD_MAP\n");
5203 BUG();
5204 }
e3d6f909 5205 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db
NB		 5206 if (ret < 0) {
5207 cmd->transport_error_status = ret;
5208 transport_generic_request_failure(cmd, NULL,
5209 0, (cmd->data_direction !=
5210 DMA_TO_DEVICE));
5211 break;
5212 }
5213 /* Fall through */
5214 case TRANSPORT_NEW_CMD:
5215 ret = transport_generic_new_cmd(cmd);
07bde79a
NB		 5216 if (ret == -EAGAIN)
5217 break;
5218 else if (ret < 0) {
c66ac9db
NB		 5219 cmd->transport_error_status = ret;
5220 transport_generic_request_failure(cmd, NULL,
5221 0, (cmd->data_direction !=
5222 DMA_TO_DEVICE));
5223 }
5224 break;
5225 case TRANSPORT_PROCESS_WRITE:
5226 transport_generic_process_write(cmd);
5227 break;
5228 case TRANSPORT_COMPLETE_OK:
5229 transport_stop_all_task_timers(cmd);
5230 transport_generic_complete_ok(cmd);
5231 break;
5232 case TRANSPORT_REMOVE:
35462975 5233 transport_generic_remove(cmd, 0);
c66ac9db 5234 break;
f4366772 5235 case TRANSPORT_FREE_CMD_INTR:
35462975 5236 transport_generic_free_cmd(cmd, 0, 0);
f4366772 5237 break;
c66ac9db
NB		 5238 case TRANSPORT_PROCESS_TMR:
5239 transport_generic_do_tmr(cmd);
5240 break;
5241 case TRANSPORT_COMPLETE_FAILURE:
5242 transport_generic_request_failure(cmd, NULL, 1, 1);
5243 break;
5244 case TRANSPORT_COMPLETE_TIMEOUT:
5245 transport_stop_all_task_timers(cmd);
5246 transport_generic_request_timeout(cmd);
5247 break;
07bde79a
NB		 5248 case TRANSPORT_COMPLETE_QF_WP:
5249 transport_generic_write_pending(cmd);
5250 break;
c66ac9db 5251 default:
6708bb27 5252 pr_err("Unknown t_state: %d deferred_t_state:"
c66ac9db 5253 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
5951146d 5254 " %u\n", cmd->t_state, cmd->deferred_t_state,
e3d6f909
AG		 5255 cmd->se_tfo->get_task_tag(cmd),
5256 cmd->se_tfo->get_cmd_state(cmd),
5257 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 5258 BUG();
5259 }
5260
5261 goto get_cmd;
5262 }
5263
5264out:
5265 transport_release_all_cmds(dev);
5266 dev->process_thread = NULL;
5267 return 0;
5268}
Linux 6.x block layer and io_uring tree(s)