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target: Prevent TRANSPORT_FREE_CMD_INTR processing in core_tmr_drain_cmd_list
[deliverable/linux.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 *
27 ******************************************************************************/
28
c66ac9db
NB		 29#include <linux/net.h>
30#include <linux/delay.h>
31#include <linux/string.h>
32#include <linux/timer.h>
33#include <linux/slab.h>
34#include <linux/blkdev.h>
35#include <linux/spinlock.h>
c66ac9db
NB		 36#include <linux/kthread.h>
37#include <linux/in.h>
38#include <linux/cdrom.h>
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
c66ac9db 623 if (t_state) {
a1d8b49a 624 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 625 cmd->t_state = t_state;
a1d8b49a
AG		 626 atomic_set(&cmd->t_transport_active, 1);
627 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 628 }
629
630 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
79a7fef2
RD		 631
632 /* If the cmd is already on the list, remove it before we add it */
633 if (!list_empty(&cmd->se_queue_node))
634 list_del(&cmd->se_queue_node);
635 else
636 atomic_inc(&qobj->queue_cnt);
637
07bde79a
NB		 638 if (cmd->se_cmd_flags & SCF_EMULATE_QUEUE_FULL) {
639 cmd->se_cmd_flags &= ~SCF_EMULATE_QUEUE_FULL;
640 list_add(&cmd->se_queue_node, &qobj->qobj_list);
641 } else
642 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
79a7fef2 643 atomic_set(&cmd->t_transport_queue_active, 1);
c66ac9db
NB		 644 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
645
c66ac9db 646 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 647}
648
5951146d
AG		 649static struct se_cmd *
650transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 651{
5951146d 652 struct se_cmd *cmd;
c66ac9db
NB		 653 unsigned long flags;
654
655 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
656 if (list_empty(&qobj->qobj_list)) {
657 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
658 return NULL;
659 }
5951146d 660 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 661
79a7fef2 662 atomic_set(&cmd->t_transport_queue_active, 0);
c66ac9db 663
79a7fef2 664 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 665 atomic_dec(&qobj->queue_cnt);
666 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
667
5951146d 668 return cmd;
c66ac9db
NB		 669}
670
671static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
672 struct se_queue_obj *qobj)
673{
c66ac9db
NB		 674 unsigned long flags;
675
676 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
6708bb27 677 if (!atomic_read(&cmd->t_transport_queue_active)) {
c66ac9db
NB		 678 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
679 return;
680 }
79a7fef2
RD		 681 atomic_set(&cmd->t_transport_queue_active, 0);
682 atomic_dec(&qobj->queue_cnt);
683 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 684 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
685
a1d8b49a 686 if (atomic_read(&cmd->t_transport_queue_active)) {
6708bb27 687 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
e3d6f909 688 cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 689 atomic_read(&cmd->t_transport_queue_active));
c66ac9db
NB		 690 }
691}
692
693/*
694 * Completion function used by TCM subsystem plugins (such as FILEIO)
695 * for queueing up response from struct se_subsystem_api->do_task()
696 */
697void transport_complete_sync_cache(struct se_cmd *cmd, int good)
698{
a1d8b49a 699 struct se_task *task = list_entry(cmd->t_task_list.next,
c66ac9db
NB		 700 struct se_task, t_list);
701
702 if (good) {
703 cmd->scsi_status = SAM_STAT_GOOD;
704 task->task_scsi_status = GOOD;
705 } else {
706 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
707 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
e3d6f909 708 task->task_se_cmd->transport_error_status =
c66ac9db
NB		 709 PYX_TRANSPORT_ILLEGAL_REQUEST;
710 }
711
712 transport_complete_task(task, good);
713}
714EXPORT_SYMBOL(transport_complete_sync_cache);
715
716/* transport_complete_task():
717 *
718 * Called from interrupt and non interrupt context depending
719 * on the transport plugin.
720 */
721void transport_complete_task(struct se_task *task, int success)
722{
e3d6f909 723 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db
NB		 724 struct se_device *dev = task->se_dev;
725 int t_state;
726 unsigned long flags;
727#if 0
6708bb27 728 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
a1d8b49a 729 cmd->t_task_cdb[0], dev);
c66ac9db 730#endif
e3d6f909 731 if (dev)
c66ac9db 732 atomic_inc(&dev->depth_left);
c66ac9db 733
a1d8b49a 734 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 735 atomic_set(&task->task_active, 0);
736
737 /*
738 * See if any sense data exists, if so set the TASK_SENSE flag.
739 * Also check for any other post completion work that needs to be
740 * done by the plugins.
741 */
742 if (dev && dev->transport->transport_complete) {
743 if (dev->transport->transport_complete(task) != 0) {
744 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
745 task->task_sense = 1;
746 success = 1;
747 }
748 }
749
750 /*
751 * See if we are waiting for outstanding struct se_task
752 * to complete for an exception condition
753 */
754 if (atomic_read(&task->task_stop)) {
755 /*
a1d8b49a 756 * Decrement cmd->t_se_count if this task had
c66ac9db
NB		 757 * previously thrown its timeout exception handler.
758 */
759 if (atomic_read(&task->task_timeout)) {
a1d8b49a 760 atomic_dec(&cmd->t_se_count);
c66ac9db
NB		 761 atomic_set(&task->task_timeout, 0);
762 }
a1d8b49a 763 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 764
765 complete(&task->task_stop_comp);
766 return;
767 }
768 /*
769 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
770 * left counter to determine when the struct se_cmd is ready to be queued to
771 * the processing thread.
772 */
773 if (atomic_read(&task->task_timeout)) {
6708bb27
AG		 774 if (!atomic_dec_and_test(
775 &cmd->t_task_cdbs_timeout_left)) {
a1d8b49a 776 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 777 flags);
778 return;
779 }
780 t_state = TRANSPORT_COMPLETE_TIMEOUT;
a1d8b49a 781 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 782
783 transport_add_cmd_to_queue(cmd, t_state);
784 return;
785 }
a1d8b49a 786 atomic_dec(&cmd->t_task_cdbs_timeout_left);
c66ac9db
NB		 787
788 /*
789 * Decrement the outstanding t_task_cdbs_left count. The last
790 * struct se_task from struct se_cmd will complete itself into the
791 * device queue depending upon int success.
792 */
6708bb27 793 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
c66ac9db 794 if (!success)
a1d8b49a 795 cmd->t_tasks_failed = 1;
c66ac9db 796
a1d8b49a 797 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 798 return;
799 }
800
a1d8b49a 801 if (!success || cmd->t_tasks_failed) {
c66ac9db
NB		 802 t_state = TRANSPORT_COMPLETE_FAILURE;
803 if (!task->task_error_status) {
804 task->task_error_status =
805 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
806 cmd->transport_error_status =
807 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
808 }
809 } else {
a1d8b49a 810 atomic_set(&cmd->t_transport_complete, 1);
c66ac9db
NB		 811 t_state = TRANSPORT_COMPLETE_OK;
812 }
a1d8b49a 813 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 814
815 transport_add_cmd_to_queue(cmd, t_state);
816}
817EXPORT_SYMBOL(transport_complete_task);
818
819/*
820 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
821 * struct se_task list are ready to be added to the active execution list
822 * struct se_device
823
824 * Called with se_dev_t->execute_task_lock called.
825 */
826static inline int transport_add_task_check_sam_attr(
827 struct se_task *task,
828 struct se_task *task_prev,
829 struct se_device *dev)
830{
831 /*
832 * No SAM Task attribute emulation enabled, add to tail of
833 * execution queue
834 */
835 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
836 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
837 return 0;
838 }
839 /*
840 * HEAD_OF_QUEUE attribute for received CDB, which means
841 * the first task that is associated with a struct se_cmd goes to
842 * head of the struct se_device->execute_task_list, and task_prev
843 * after that for each subsequent task
844 */
e66ecd50 845 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 846 list_add(&task->t_execute_list,
847 (task_prev != NULL) ?
848 &task_prev->t_execute_list :
849 &dev->execute_task_list);
850
6708bb27 851 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
c66ac9db 852 " in execution queue\n",
6708bb27 853 task->task_se_cmd->t_task_cdb[0]);
c66ac9db
NB		 854 return 1;
855 }
856 /*
857 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
858 * transitioned from Dermant -> Active state, and are added to the end
859 * of the struct se_device->execute_task_list
860 */
861 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
862 return 0;
863}
864
865/* __transport_add_task_to_execute_queue():
866 *
867 * Called with se_dev_t->execute_task_lock called.
868 */
869static void __transport_add_task_to_execute_queue(
870 struct se_task *task,
871 struct se_task *task_prev,
872 struct se_device *dev)
873{
874 int head_of_queue;
875
876 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
877 atomic_inc(&dev->execute_tasks);
878
879 if (atomic_read(&task->task_state_active))
880 return;
881 /*
882 * Determine if this task needs to go to HEAD_OF_QUEUE for the
883 * state list as well. Running with SAM Task Attribute emulation
884 * will always return head_of_queue == 0 here
885 */
886 if (head_of_queue)
887 list_add(&task->t_state_list, (task_prev) ?
888 &task_prev->t_state_list :
889 &dev->state_task_list);
890 else
891 list_add_tail(&task->t_state_list, &dev->state_task_list);
892
893 atomic_set(&task->task_state_active, 1);
894
6708bb27 895 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
e3d6f909 896 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
c66ac9db
NB		 897 task, dev);
898}
899
900static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
901{
902 struct se_device *dev;
903 struct se_task *task;
904 unsigned long flags;
905
a1d8b49a
AG		 906 spin_lock_irqsave(&cmd->t_state_lock, flags);
907 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 908 dev = task->se_dev;
909
910 if (atomic_read(&task->task_state_active))
911 continue;
912
913 spin_lock(&dev->execute_task_lock);
914 list_add_tail(&task->t_state_list, &dev->state_task_list);
915 atomic_set(&task->task_state_active, 1);
916
6708bb27
AG		 917 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
918 task->task_se_cmd->se_tfo->get_task_tag(
c66ac9db
NB		 919 task->task_se_cmd), task, dev);
920
921 spin_unlock(&dev->execute_task_lock);
922 }
a1d8b49a 923 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 924}
925
926static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
927{
5951146d 928 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 929 struct se_task *task, *task_prev = NULL;
930 unsigned long flags;
931
932 spin_lock_irqsave(&dev->execute_task_lock, flags);
a1d8b49a 933 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 934 if (atomic_read(&task->task_execute_queue))
935 continue;
936 /*
937 * __transport_add_task_to_execute_queue() handles the
938 * SAM Task Attribute emulation if enabled
939 */
940 __transport_add_task_to_execute_queue(task, task_prev, dev);
941 atomic_set(&task->task_execute_queue, 1);
942 task_prev = task;
943 }
944 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 945}
946
947/* transport_remove_task_from_execute_queue():
948 *
949 *
950 */
52208ae3 951void transport_remove_task_from_execute_queue(
c66ac9db
NB		 952 struct se_task *task,
953 struct se_device *dev)
954{
955 unsigned long flags;
956
af57c3ac
NB		 957 if (atomic_read(&task->task_execute_queue) == 0) {
958 dump_stack();
959 return;
960 }
961
c66ac9db
NB		 962 spin_lock_irqsave(&dev->execute_task_lock, flags);
963 list_del(&task->t_execute_list);
af57c3ac 964 atomic_set(&task->task_execute_queue, 0);
c66ac9db
NB		 965 atomic_dec(&dev->execute_tasks);
966 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
967}
968
07bde79a
NB		 969/*
970 * Handle QUEUE_FULL / -EAGAIN status
971 */
972
973static void target_qf_do_work(struct work_struct *work)
974{
975 struct se_device *dev = container_of(work, struct se_device,
976 qf_work_queue);
bcac364a 977 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 978 struct se_cmd *cmd, *cmd_tmp;
979
980 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 981 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
982 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 983
bcac364a 984 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 985 list_del(&cmd->se_qf_node);
986 atomic_dec(&dev->dev_qf_count);
987 smp_mb__after_atomic_dec();
07bde79a 988
6708bb27 989 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a
NB		 990 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
991 (cmd->t_state == TRANSPORT_COMPLETE_OK) ? "COMPLETE_OK" :
992 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
993 : "UNKNOWN");
994 /*
995 * The SCF_EMULATE_QUEUE_FULL flag will be cleared once se_cmd
996 * has been added to head of queue
997 */
998 transport_add_cmd_to_queue(cmd, cmd->t_state);
07bde79a 999 }
07bde79a
NB		 1000}
1001
c66ac9db
NB		 1002unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
1003{
1004 switch (cmd->data_direction) {
1005 case DMA_NONE:
1006 return "NONE";
1007 case DMA_FROM_DEVICE:
1008 return "READ";
1009 case DMA_TO_DEVICE:
1010 return "WRITE";
1011 case DMA_BIDIRECTIONAL:
1012 return "BIDI";
1013 default:
1014 break;
1015 }
1016
1017 return "UNKNOWN";
1018}
1019
1020void transport_dump_dev_state(
1021 struct se_device *dev,
1022 char *b,
1023 int *bl)
1024{
1025 *bl += sprintf(b + *bl, "Status: ");
1026 switch (dev->dev_status) {
1027 case TRANSPORT_DEVICE_ACTIVATED:
1028 *bl += sprintf(b + *bl, "ACTIVATED");
1029 break;
1030 case TRANSPORT_DEVICE_DEACTIVATED:
1031 *bl += sprintf(b + *bl, "DEACTIVATED");
1032 break;
1033 case TRANSPORT_DEVICE_SHUTDOWN:
1034 *bl += sprintf(b + *bl, "SHUTDOWN");
1035 break;
1036 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
1037 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
1038 *bl += sprintf(b + *bl, "OFFLINE");
1039 break;
1040 default:
1041 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
1042 break;
1043 }
1044
1045 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
1046 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
1047 dev->queue_depth);
1048 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
e3d6f909 1049 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db
NB		 1050 *bl += sprintf(b + *bl, " ");
1051}
1052
1053/* transport_release_all_cmds():
1054 *
1055 *
1056 */
1057static void transport_release_all_cmds(struct se_device *dev)
1058{
5951146d 1059 struct se_cmd *cmd, *tcmd;
c66ac9db
NB		 1060 int bug_out = 0, t_state;
1061 unsigned long flags;
1062
e3d6f909 1063 spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
5951146d
AG		 1064 list_for_each_entry_safe(cmd, tcmd, &dev->dev_queue_obj.qobj_list,
1065 se_queue_node) {
1066 t_state = cmd->t_state;
79a7fef2 1067 list_del_init(&cmd->se_queue_node);
e3d6f909 1068 spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock,
c66ac9db
NB		 1069 flags);
1070
6708bb27 1071 pr_err("Releasing ITT: 0x%08x, i_state: %u,"
c66ac9db 1072 " t_state: %u directly\n",
e3d6f909
AG		 1073 cmd->se_tfo->get_task_tag(cmd),
1074 cmd->se_tfo->get_cmd_state(cmd), t_state);
c66ac9db
NB		 1075
1076 transport_release_fe_cmd(cmd);
1077 bug_out = 1;
1078
e3d6f909 1079 spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
c66ac9db 1080 }
e3d6f909 1081 spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock, flags);
c66ac9db
NB		 1082#if 0
1083 if (bug_out)
1084 BUG();
1085#endif
1086}
1087
1088void transport_dump_vpd_proto_id(
1089 struct t10_vpd *vpd,
1090 unsigned char *p_buf,
1091 int p_buf_len)
1092{
1093 unsigned char buf[VPD_TMP_BUF_SIZE];
1094 int len;
1095
1096 memset(buf, 0, VPD_TMP_BUF_SIZE);
1097 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1098
1099 switch (vpd->protocol_identifier) {
1100 case 0x00:
1101 sprintf(buf+len, "Fibre Channel\n");
1102 break;
1103 case 0x10:
1104 sprintf(buf+len, "Parallel SCSI\n");
1105 break;
1106 case 0x20:
1107 sprintf(buf+len, "SSA\n");
1108 break;
1109 case 0x30:
1110 sprintf(buf+len, "IEEE 1394\n");
1111 break;
1112 case 0x40:
1113 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1114 " Protocol\n");
1115 break;
1116 case 0x50:
1117 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1118 break;
1119 case 0x60:
1120 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1121 break;
1122 case 0x70:
1123 sprintf(buf+len, "Automation/Drive Interface Transport"
1124 " Protocol\n");
1125 break;
1126 case 0x80:
1127 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1128 break;
1129 default:
1130 sprintf(buf+len, "Unknown 0x%02x\n",
1131 vpd->protocol_identifier);
1132 break;
1133 }
1134
1135 if (p_buf)
1136 strncpy(p_buf, buf, p_buf_len);
1137 else
6708bb27 1138 pr_debug("%s", buf);
c66ac9db
NB		 1139}
1140
1141void
1142transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1143{
1144 /*
1145 * Check if the Protocol Identifier Valid (PIV) bit is set..
1146 *
1147 * from spc3r23.pdf section 7.5.1
1148 */
1149 if (page_83[1] & 0x80) {
1150 vpd->protocol_identifier = (page_83[0] & 0xf0);
1151 vpd->protocol_identifier_set = 1;
1152 transport_dump_vpd_proto_id(vpd, NULL, 0);
1153 }
1154}
1155EXPORT_SYMBOL(transport_set_vpd_proto_id);
1156
1157int transport_dump_vpd_assoc(
1158 struct t10_vpd *vpd,
1159 unsigned char *p_buf,
1160 int p_buf_len)
1161{
1162 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1163 int ret = 0;
1164 int len;
c66ac9db
NB		 1165
1166 memset(buf, 0, VPD_TMP_BUF_SIZE);
1167 len = sprintf(buf, "T10 VPD Identifier Association: ");
1168
1169 switch (vpd->association) {
1170 case 0x00:
1171 sprintf(buf+len, "addressed logical unit\n");
1172 break;
1173 case 0x10:
1174 sprintf(buf+len, "target port\n");
1175 break;
1176 case 0x20:
1177 sprintf(buf+len, "SCSI target device\n");
1178 break;
1179 default:
1180 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 1181 ret = -EINVAL;
c66ac9db
NB		 1182 break;
1183 }
1184
1185 if (p_buf)
1186 strncpy(p_buf, buf, p_buf_len);
1187 else
6708bb27 1188 pr_debug("%s", buf);
c66ac9db
NB		 1189
1190 return ret;
1191}
1192
1193int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1194{
1195 /*
1196 * The VPD identification association..
1197 *
1198 * from spc3r23.pdf Section 7.6.3.1 Table 297
1199 */
1200 vpd->association = (page_83[1] & 0x30);
1201 return transport_dump_vpd_assoc(vpd, NULL, 0);
1202}
1203EXPORT_SYMBOL(transport_set_vpd_assoc);
1204
1205int transport_dump_vpd_ident_type(
1206 struct t10_vpd *vpd,
1207 unsigned char *p_buf,
1208 int p_buf_len)
1209{
1210 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1211 int ret = 0;
1212 int len;
c66ac9db
NB		 1213
1214 memset(buf, 0, VPD_TMP_BUF_SIZE);
1215 len = sprintf(buf, "T10 VPD Identifier Type: ");
1216
1217 switch (vpd->device_identifier_type) {
1218 case 0x00:
1219 sprintf(buf+len, "Vendor specific\n");
1220 break;
1221 case 0x01:
1222 sprintf(buf+len, "T10 Vendor ID based\n");
1223 break;
1224 case 0x02:
1225 sprintf(buf+len, "EUI-64 based\n");
1226 break;
1227 case 0x03:
1228 sprintf(buf+len, "NAA\n");
1229 break;
1230 case 0x04:
1231 sprintf(buf+len, "Relative target port identifier\n");
1232 break;
1233 case 0x08:
1234 sprintf(buf+len, "SCSI name string\n");
1235 break;
1236 default:
1237 sprintf(buf+len, "Unsupported: 0x%02x\n",
1238 vpd->device_identifier_type);
e3d6f909 1239 ret = -EINVAL;
c66ac9db
NB		 1240 break;
1241 }
1242
e3d6f909
AG		 1243 if (p_buf) {
1244 if (p_buf_len < strlen(buf)+1)
1245 return -EINVAL;
c66ac9db 1246 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1247 } else {
6708bb27 1248 pr_debug("%s", buf);
e3d6f909 1249 }
c66ac9db
NB		 1250
1251 return ret;
1252}
1253
1254int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1255{
1256 /*
1257 * The VPD identifier type..
1258 *
1259 * from spc3r23.pdf Section 7.6.3.1 Table 298
1260 */
1261 vpd->device_identifier_type = (page_83[1] & 0x0f);
1262 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1263}
1264EXPORT_SYMBOL(transport_set_vpd_ident_type);
1265
1266int transport_dump_vpd_ident(
1267 struct t10_vpd *vpd,
1268 unsigned char *p_buf,
1269 int p_buf_len)
1270{
1271 unsigned char buf[VPD_TMP_BUF_SIZE];
1272 int ret = 0;
1273
1274 memset(buf, 0, VPD_TMP_BUF_SIZE);
1275
1276 switch (vpd->device_identifier_code_set) {
1277 case 0x01: /* Binary */
1278 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1279 &vpd->device_identifier[0]);
1280 break;
1281 case 0x02: /* ASCII */
1282 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1283 &vpd->device_identifier[0]);
1284 break;
1285 case 0x03: /* UTF-8 */
1286 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1287 &vpd->device_identifier[0]);
1288 break;
1289 default:
1290 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1291 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1292 ret = -EINVAL;
c66ac9db
NB		 1293 break;
1294 }
1295
1296 if (p_buf)
1297 strncpy(p_buf, buf, p_buf_len);
1298 else
6708bb27 1299 pr_debug("%s", buf);
c66ac9db
NB		 1300
1301 return ret;
1302}
1303
1304int
1305transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1306{
1307 static const char hex_str[] = "0123456789abcdef";
1308 int j = 0, i = 4; /* offset to start of the identifer */
1309
1310 /*
1311 * The VPD Code Set (encoding)
1312 *
1313 * from spc3r23.pdf Section 7.6.3.1 Table 296
1314 */
1315 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1316 switch (vpd->device_identifier_code_set) {
1317 case 0x01: /* Binary */
1318 vpd->device_identifier[j++] =
1319 hex_str[vpd->device_identifier_type];
1320 while (i < (4 + page_83[3])) {
1321 vpd->device_identifier[j++] =
1322 hex_str[(page_83[i] & 0xf0) >> 4];
1323 vpd->device_identifier[j++] =
1324 hex_str[page_83[i] & 0x0f];
1325 i++;
1326 }
1327 break;
1328 case 0x02: /* ASCII */
1329 case 0x03: /* UTF-8 */
1330 while (i < (4 + page_83[3]))
1331 vpd->device_identifier[j++] = page_83[i++];
1332 break;
1333 default:
1334 break;
1335 }
1336
1337 return transport_dump_vpd_ident(vpd, NULL, 0);
1338}
1339EXPORT_SYMBOL(transport_set_vpd_ident);
1340
1341static void core_setup_task_attr_emulation(struct se_device *dev)
1342{
1343 /*
1344 * If this device is from Target_Core_Mod/pSCSI, disable the
1345 * SAM Task Attribute emulation.
1346 *
1347 * This is currently not available in upsream Linux/SCSI Target
1348 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1349 */
e3d6f909 1350 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1351 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1352 return;
1353 }
1354
1355 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1356 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1357 " device\n", dev->transport->name,
1358 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1359}
1360
1361static void scsi_dump_inquiry(struct se_device *dev)
1362{
e3d6f909 1363 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
c66ac9db
NB		 1364 int i, device_type;
1365 /*
1366 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1367 */
6708bb27 1368 pr_debug(" Vendor: ");
c66ac9db
NB		 1369 for (i = 0; i < 8; i++)
1370 if (wwn->vendor[i] >= 0x20)
6708bb27 1371 pr_debug("%c", wwn->vendor[i]);
c66ac9db 1372 else
6708bb27 1373 pr_debug(" ");
c66ac9db 1374
6708bb27 1375 pr_debug(" Model: ");
c66ac9db
NB		 1376 for (i = 0; i < 16; i++)
1377 if (wwn->model[i] >= 0x20)
6708bb27 1378 pr_debug("%c", wwn->model[i]);
c66ac9db 1379 else
6708bb27 1380 pr_debug(" ");
c66ac9db 1381
6708bb27 1382 pr_debug(" Revision: ");
c66ac9db
NB		 1383 for (i = 0; i < 4; i++)
1384 if (wwn->revision[i] >= 0x20)
6708bb27 1385 pr_debug("%c", wwn->revision[i]);
c66ac9db 1386 else
6708bb27 1387 pr_debug(" ");
c66ac9db 1388
6708bb27 1389 pr_debug("\n");
c66ac9db 1390
e3d6f909 1391 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1392 pr_debug(" Type: %s ", scsi_device_type(device_type));
1393 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1394 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1395}
1396
1397struct se_device *transport_add_device_to_core_hba(
1398 struct se_hba *hba,
1399 struct se_subsystem_api *transport,
1400 struct se_subsystem_dev *se_dev,
1401 u32 device_flags,
1402 void *transport_dev,
1403 struct se_dev_limits *dev_limits,
1404 const char *inquiry_prod,
1405 const char *inquiry_rev)
1406{
12a18bdc 1407 int force_pt;
c66ac9db
NB		 1408 struct se_device *dev;
1409
1410 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1411 if (!dev) {
1412 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1413 return NULL;
1414 }
c66ac9db 1415
e3d6f909 1416 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1417 dev->dev_flags = device_flags;
1418 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1419 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1420 dev->se_hba = hba;
1421 dev->se_sub_dev = se_dev;
1422 dev->transport = transport;
1423 atomic_set(&dev->active_cmds, 0);
1424 INIT_LIST_HEAD(&dev->dev_list);
1425 INIT_LIST_HEAD(&dev->dev_sep_list);
1426 INIT_LIST_HEAD(&dev->dev_tmr_list);
1427 INIT_LIST_HEAD(&dev->execute_task_list);
1428 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1429 INIT_LIST_HEAD(&dev->ordered_cmd_list);
1430 INIT_LIST_HEAD(&dev->state_task_list);
07bde79a 1431 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1432 spin_lock_init(&dev->execute_task_lock);
1433 spin_lock_init(&dev->delayed_cmd_lock);
1434 spin_lock_init(&dev->ordered_cmd_lock);
1435 spin_lock_init(&dev->state_task_lock);
1436 spin_lock_init(&dev->dev_alua_lock);
1437 spin_lock_init(&dev->dev_reservation_lock);
1438 spin_lock_init(&dev->dev_status_lock);
1439 spin_lock_init(&dev->dev_status_thr_lock);
1440 spin_lock_init(&dev->se_port_lock);
1441 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1442 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1443
1444 dev->queue_depth = dev_limits->queue_depth;
1445 atomic_set(&dev->depth_left, dev->queue_depth);
1446 atomic_set(&dev->dev_ordered_id, 0);
1447
1448 se_dev_set_default_attribs(dev, dev_limits);
1449
1450 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1451 dev->creation_time = get_jiffies_64();
1452 spin_lock_init(&dev->stats_lock);
1453
1454 spin_lock(&hba->device_lock);
1455 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1456 hba->dev_count++;
1457 spin_unlock(&hba->device_lock);
1458 /*
1459 * Setup the SAM Task Attribute emulation for struct se_device
1460 */
1461 core_setup_task_attr_emulation(dev);
1462 /*
1463 * Force PR and ALUA passthrough emulation with internal object use.
1464 */
1465 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1466 /*
1467 * Setup the Reservations infrastructure for struct se_device
1468 */
1469 core_setup_reservations(dev, force_pt);
1470 /*
1471 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1472 */
1473 if (core_setup_alua(dev, force_pt) < 0)
1474 goto out;
1475
1476 /*
1477 * Startup the struct se_device processing thread
1478 */
1479 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1480 "LIO_%s", dev->transport->name);
c66ac9db 1481 if (IS_ERR(dev->process_thread)) {
6708bb27 1482 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1483 dev->transport->name);
c66ac9db
NB		 1484 goto out;
1485 }
07bde79a
NB		 1486 /*
1487 * Setup work_queue for QUEUE_FULL
1488 */
1489 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1490 /*
1491 * Preload the initial INQUIRY const values if we are doing
1492 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1493 * passthrough because this is being provided by the backend LLD.
1494 * This is required so that transport_get_inquiry() copies these
1495 * originals once back into DEV_T10_WWN(dev) for the virtual device
1496 * setup.
1497 */
e3d6f909 1498 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1499 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1500 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1501 " INQUIRY consts\n");
1502 goto out;
1503 }
1504
e3d6f909
AG		 1505 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1506 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1507 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1508 }
1509 scsi_dump_inquiry(dev);
1510
12a18bdc 1511 return dev;
c66ac9db 1512out:
c66ac9db
NB		 1513 kthread_stop(dev->process_thread);
1514
1515 spin_lock(&hba->device_lock);
1516 list_del(&dev->dev_list);
1517 hba->dev_count--;
1518 spin_unlock(&hba->device_lock);
1519
1520 se_release_vpd_for_dev(dev);
1521
c66ac9db
NB		 1522 kfree(dev);
1523
1524 return NULL;
1525}
1526EXPORT_SYMBOL(transport_add_device_to_core_hba);
1527
1528/* transport_generic_prepare_cdb():
1529 *
1530 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1531 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1532 * The point of this is since we are mapping iSCSI LUNs to
1533 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1534 * devices and HBAs for a loop.
1535 */
1536static inline void transport_generic_prepare_cdb(
1537 unsigned char *cdb)
1538{
1539 switch (cdb[0]) {
1540 case READ_10: /* SBC - RDProtect */
1541 case READ_12: /* SBC - RDProtect */
1542 case READ_16: /* SBC - RDProtect */
1543 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1544 case VERIFY: /* SBC - VRProtect */
1545 case VERIFY_16: /* SBC - VRProtect */
1546 case WRITE_VERIFY: /* SBC - VRProtect */
1547 case WRITE_VERIFY_12: /* SBC - VRProtect */
1548 break;
1549 default:
1550 cdb[1] &= 0x1f; /* clear logical unit number */
1551 break;
1552 }
1553}
1554
1555static struct se_task *
1556transport_generic_get_task(struct se_cmd *cmd,
1557 enum dma_data_direction data_direction)
1558{
1559 struct se_task *task;
5951146d 1560 struct se_device *dev = cmd->se_dev;
c66ac9db 1561
6708bb27 1562 task = dev->transport->alloc_task(cmd->t_task_cdb);
c66ac9db 1563 if (!task) {
6708bb27 1564 pr_err("Unable to allocate struct se_task\n");
c66ac9db
NB		 1565 return NULL;
1566 }
1567
1568 INIT_LIST_HEAD(&task->t_list);
1569 INIT_LIST_HEAD(&task->t_execute_list);
1570 INIT_LIST_HEAD(&task->t_state_list);
1571 init_completion(&task->task_stop_comp);
c66ac9db
NB		 1572 task->task_se_cmd = cmd;
1573 task->se_dev = dev;
1574 task->task_data_direction = data_direction;
1575
c66ac9db
NB		 1576 return task;
1577}
1578
1579static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1580
c66ac9db
NB		 1581/*
1582 * Used by fabric modules containing a local struct se_cmd within their
1583 * fabric dependent per I/O descriptor.
1584 */
1585void transport_init_se_cmd(
1586 struct se_cmd *cmd,
1587 struct target_core_fabric_ops *tfo,
1588 struct se_session *se_sess,
1589 u32 data_length,
1590 int data_direction,
1591 int task_attr,
1592 unsigned char *sense_buffer)
1593{
5951146d
AG		 1594 INIT_LIST_HEAD(&cmd->se_lun_node);
1595 INIT_LIST_HEAD(&cmd->se_delayed_node);
1596 INIT_LIST_HEAD(&cmd->se_ordered_node);
07bde79a 1597 INIT_LIST_HEAD(&cmd->se_qf_node);
79a7fef2 1598 INIT_LIST_HEAD(&cmd->se_queue_node);
c66ac9db 1599
a1d8b49a
AG		 1600 INIT_LIST_HEAD(&cmd->t_task_list);
1601 init_completion(&cmd->transport_lun_fe_stop_comp);
1602 init_completion(&cmd->transport_lun_stop_comp);
1603 init_completion(&cmd->t_transport_stop_comp);
1604 spin_lock_init(&cmd->t_state_lock);
1605 atomic_set(&cmd->transport_dev_active, 1);
c66ac9db
NB		 1606
1607 cmd->se_tfo = tfo;
1608 cmd->se_sess = se_sess;
1609 cmd->data_length = data_length;
1610 cmd->data_direction = data_direction;
1611 cmd->sam_task_attr = task_attr;
1612 cmd->sense_buffer = sense_buffer;
1613}
1614EXPORT_SYMBOL(transport_init_se_cmd);
1615
1616static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1617{
1618 /*
1619 * Check if SAM Task Attribute emulation is enabled for this
1620 * struct se_device storage object
1621 */
5951146d 1622 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1623 return 0;
1624
e66ecd50 1625 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1626 pr_debug("SAM Task Attribute ACA"
c66ac9db 1627 " emulation is not supported\n");
e3d6f909 1628 return -EINVAL;
c66ac9db
NB		 1629 }
1630 /*
1631 * Used to determine when ORDERED commands should go from
1632 * Dormant to Active status.
1633 */
5951146d 1634 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1635 smp_mb__after_atomic_inc();
6708bb27 1636 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1637 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1638 cmd->se_dev->transport->name);
c66ac9db
NB		 1639 return 0;
1640}
1641
1642void transport_free_se_cmd(
1643 struct se_cmd *se_cmd)
1644{
1645 if (se_cmd->se_tmr_req)
1646 core_tmr_release_req(se_cmd->se_tmr_req);
1647 /*
1648 * Check and free any extended CDB buffer that was allocated
1649 */
a1d8b49a
AG		 1650 if (se_cmd->t_task_cdb != se_cmd->__t_task_cdb)
1651 kfree(se_cmd->t_task_cdb);
c66ac9db
NB		 1652}
1653EXPORT_SYMBOL(transport_free_se_cmd);
1654
1655static void transport_generic_wait_for_tasks(struct se_cmd *, int, int);
1656
1657/* transport_generic_allocate_tasks():
1658 *
1659 * Called from fabric RX Thread.
1660 */
1661int transport_generic_allocate_tasks(
1662 struct se_cmd *cmd,
1663 unsigned char *cdb)
1664{
1665 int ret;
1666
1667 transport_generic_prepare_cdb(cdb);
1668
1669 /*
1670 * This is needed for early exceptions.
1671 */
1672 cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
1673
c66ac9db
NB		 1674 /*
1675 * Ensure that the received CDB is less than the max (252 + 8) bytes
1676 * for VARIABLE_LENGTH_CMD
1677 */
1678 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1679 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1680 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1681 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
e3d6f909 1682 return -EINVAL;
c66ac9db
NB		 1683 }
1684 /*
1685 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1686 * allocate the additional extended CDB buffer now.. Otherwise
1687 * setup the pointer from __t_task_cdb to t_task_cdb.
1688 */
a1d8b49a
AG		 1689 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1690 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1691 GFP_KERNEL);
6708bb27
AG		 1692 if (!cmd->t_task_cdb) {
1693 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1694 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1695 scsi_command_size(cdb),
a1d8b49a 1696 (unsigned long)sizeof(cmd->__t_task_cdb));
e3d6f909 1697 return -ENOMEM;
c66ac9db
NB		 1698 }
1699 } else
a1d8b49a 1700 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1701 /*
a1d8b49a 1702 * Copy the original CDB into cmd->
c66ac9db 1703 */
a1d8b49a 1704 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1705 /*
1706 * Setup the received CDB based on SCSI defined opcodes and
1707 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1708 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1709 * pointer is expected to be setup before we reach this point.
1710 */
1711 ret = transport_generic_cmd_sequencer(cmd, cdb);
1712 if (ret < 0)
1713 return ret;
1714 /*
1715 * Check for SAM Task Attribute Emulation
1716 */
1717 if (transport_check_alloc_task_attr(cmd) < 0) {
1718 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1719 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1720 return -EINVAL;
c66ac9db
NB		 1721 }
1722 spin_lock(&cmd->se_lun->lun_sep_lock);
1723 if (cmd->se_lun->lun_sep)
1724 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1725 spin_unlock(&cmd->se_lun->lun_sep_lock);
1726 return 0;
1727}
1728EXPORT_SYMBOL(transport_generic_allocate_tasks);
1729
1730/*
1731 * Used by fabric module frontends not defining a TFO->new_cmd_map()
1732 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD statis
1733 */
1734int transport_generic_handle_cdb(
1735 struct se_cmd *cmd)
1736{
e3d6f909 1737 if (!cmd->se_lun) {
c66ac9db 1738 dump_stack();
6708bb27 1739 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1740 return -EINVAL;
c66ac9db 1741 }
695434e1 1742
c66ac9db
NB		 1743 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD);
1744 return 0;
1745}
1746EXPORT_SYMBOL(transport_generic_handle_cdb);
1747
dd8ae59d
NB		 1748static void transport_generic_request_failure(struct se_cmd *,
1749 struct se_device *, int, int);
695434e1
NB		 1750/*
1751 * Used by fabric module frontends to queue tasks directly.
1752 * Many only be used from process context only
1753 */
1754int transport_handle_cdb_direct(
1755 struct se_cmd *cmd)
1756{
dd8ae59d
NB		 1757 int ret;
1758
695434e1
NB		 1759 if (!cmd->se_lun) {
1760 dump_stack();
6708bb27 1761 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1762 return -EINVAL;
1763 }
1764 if (in_interrupt()) {
1765 dump_stack();
6708bb27 1766 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1767 " from interrupt context\n");
1768 return -EINVAL;
1769 }
dd8ae59d
NB		 1770 /*
1771 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1772 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1773 * in existing usage to ensure that outstanding descriptors are handled
1774 * correctly during shutdown via transport_generic_wait_for_tasks()
1775 *
1776 * Also, we don't take cmd->t_state_lock here as we only expect
1777 * this to be called for initial descriptor submission.
1778 */
1779 cmd->t_state = TRANSPORT_NEW_CMD;
1780 atomic_set(&cmd->t_transport_active, 1);
1781 /*
1782 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1783 * so follow TRANSPORT_NEW_CMD processing thread context usage
1784 * and call transport_generic_request_failure() if necessary..
1785 */
1786 ret = transport_generic_new_cmd(cmd);
1787 if (ret == -EAGAIN)
1788 return 0;
1789 else if (ret < 0) {
1790 cmd->transport_error_status = ret;
1791 transport_generic_request_failure(cmd, NULL, 0,
1792 (cmd->data_direction != DMA_TO_DEVICE));
1793 }
1794 return 0;
695434e1
NB		 1795}
1796EXPORT_SYMBOL(transport_handle_cdb_direct);
1797
c66ac9db
NB		 1798/*
1799 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1800 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1801 * complete setup in TCM process context w/ TFO->new_cmd_map().
1802 */
1803int transport_generic_handle_cdb_map(
1804 struct se_cmd *cmd)
1805{
e3d6f909 1806 if (!cmd->se_lun) {
c66ac9db 1807 dump_stack();
6708bb27 1808 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1809 return -EINVAL;
c66ac9db
NB		 1810 }
1811
1812 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP);
1813 return 0;
1814}
1815EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1816
1817/* transport_generic_handle_data():
1818 *
1819 *
1820 */
1821int transport_generic_handle_data(
1822 struct se_cmd *cmd)
1823{
1824 /*
1825 * For the software fabric case, then we assume the nexus is being
1826 * failed/shutdown when signals are pending from the kthread context
1827 * caller, so we return a failure. For the HW target mode case running
1828 * in interrupt code, the signal_pending() check is skipped.
1829 */
1830 if (!in_interrupt() && signal_pending(current))
e3d6f909 1831 return -EPERM;
c66ac9db
NB		 1832 /*
1833 * If the received CDB has aleady been ABORTED by the generic
1834 * target engine, we now call transport_check_aborted_status()
1835 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1836 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1837 * sequences at this point.
1838 */
1839 if (transport_check_aborted_status(cmd, 1) != 0)
1840 return 0;
1841
1842 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE);
1843 return 0;
1844}
1845EXPORT_SYMBOL(transport_generic_handle_data);
1846
1847/* transport_generic_handle_tmr():
1848 *
1849 *
1850 */
1851int transport_generic_handle_tmr(
1852 struct se_cmd *cmd)
1853{
1854 /*
1855 * This is needed for early exceptions.
1856 */
1857 cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
c66ac9db
NB		 1858
1859 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR);
1860 return 0;
1861}
1862EXPORT_SYMBOL(transport_generic_handle_tmr);
1863
f4366772
NB		 1864void transport_generic_free_cmd_intr(
1865 struct se_cmd *cmd)
1866{
1867 transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR);
1868}
1869EXPORT_SYMBOL(transport_generic_free_cmd_intr);
1870
c66ac9db
NB		 1871static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1872{
1873 struct se_task *task, *task_tmp;
1874 unsigned long flags;
1875 int ret = 0;
1876
6708bb27 1877 pr_debug("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 1878 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 1879
1880 /*
1881 * No tasks remain in the execution queue
1882 */
a1d8b49a 1883 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1884 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 1885 &cmd->t_task_list, t_list) {
6708bb27 1886 pr_debug("task_no[%d] - Processing task %p\n",
c66ac9db
NB		 1887 task->task_no, task);
1888 /*
1889 * If the struct se_task has not been sent and is not active,
1890 * remove the struct se_task from the execution queue.
1891 */
1892 if (!atomic_read(&task->task_sent) &&
1893 !atomic_read(&task->task_active)) {
a1d8b49a 1894 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1895 flags);
1896 transport_remove_task_from_execute_queue(task,
1897 task->se_dev);
1898
6708bb27 1899 pr_debug("task_no[%d] - Removed from execute queue\n",
c66ac9db 1900 task->task_no);
a1d8b49a 1901 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 1902 continue;
1903 }
1904
1905 /*
1906 * If the struct se_task is active, sleep until it is returned
1907 * from the plugin.
1908 */
1909 if (atomic_read(&task->task_active)) {
1910 atomic_set(&task->task_stop, 1);
a1d8b49a 1911 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1912 flags);
1913
6708bb27 1914 pr_debug("task_no[%d] - Waiting to complete\n",
c66ac9db
NB		 1915 task->task_no);
1916 wait_for_completion(&task->task_stop_comp);
6708bb27 1917 pr_debug("task_no[%d] - Stopped successfully\n",
c66ac9db
NB		 1918 task->task_no);
1919
a1d8b49a
AG		 1920 spin_lock_irqsave(&cmd->t_state_lock, flags);
1921 atomic_dec(&cmd->t_task_cdbs_left);
c66ac9db
NB		 1922
1923 atomic_set(&task->task_active, 0);
1924 atomic_set(&task->task_stop, 0);
1925 } else {
6708bb27 1926 pr_debug("task_no[%d] - Did nothing\n", task->task_no);
c66ac9db
NB		 1927 ret++;
1928 }
1929
1930 __transport_stop_task_timer(task, &flags);
1931 }
a1d8b49a 1932 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1933
1934 return ret;
1935}
1936
c66ac9db
NB		 1937/*
1938 * Handle SAM-esque emulation for generic transport request failures.
1939 */
1940static void transport_generic_request_failure(
1941 struct se_cmd *cmd,
1942 struct se_device *dev,
1943 int complete,
1944 int sc)
1945{
07bde79a
NB		 1946 int ret = 0;
1947
6708bb27 1948 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1949 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1950 cmd->t_task_cdb[0]);
6708bb27 1951 pr_debug("-----[ i_state: %d t_state/def_t_state:"
c66ac9db 1952 " %d/%d transport_error_status: %d\n",
e3d6f909 1953 cmd->se_tfo->get_cmd_state(cmd),
c66ac9db
NB		 1954 cmd->t_state, cmd->deferred_t_state,
1955 cmd->transport_error_status);
6708bb27 1956 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
c66ac9db
NB		 1957 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1958 " t_transport_active: %d t_transport_stop: %d"
6708bb27 1959 " t_transport_sent: %d\n", cmd->t_task_list_num,
a1d8b49a
AG		 1960 atomic_read(&cmd->t_task_cdbs_left),
1961 atomic_read(&cmd->t_task_cdbs_sent),
1962 atomic_read(&cmd->t_task_cdbs_ex_left),
1963 atomic_read(&cmd->t_transport_active),
1964 atomic_read(&cmd->t_transport_stop),
1965 atomic_read(&cmd->t_transport_sent));
c66ac9db
NB		 1966
1967 transport_stop_all_task_timers(cmd);
1968
1969 if (dev)
e3d6f909 1970 atomic_inc(&dev->depth_left);
c66ac9db
NB		 1971 /*
1972 * For SAM Task Attribute emulation for failed struct se_cmd
1973 */
1974 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1975 transport_complete_task_attr(cmd);
1976
1977 if (complete) {
1978 transport_direct_request_timeout(cmd);
1979 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
1980 }
1981
1982 switch (cmd->transport_error_status) {
1983 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
1984 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1985 break;
1986 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
1987 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
1988 break;
1989 case PYX_TRANSPORT_INVALID_CDB_FIELD:
1990 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1991 break;
1992 case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
1993 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1994 break;
1995 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
1996 if (!sc)
1997 transport_new_cmd_failure(cmd);
1998 /*
1999 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
2000 * we force this session to fall back to session
2001 * recovery.
2002 */
e3d6f909
AG		 2003 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
2004 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
c66ac9db
NB		 2005
2006 goto check_stop;
2007 case PYX_TRANSPORT_LU_COMM_FAILURE:
2008 case PYX_TRANSPORT_ILLEGAL_REQUEST:
2009 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2010 break;
2011 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
2012 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
2013 break;
2014 case PYX_TRANSPORT_WRITE_PROTECTED:
2015 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
2016 break;
2017 case PYX_TRANSPORT_RESERVATION_CONFLICT:
2018 /*
2019 * No SENSE Data payload for this case, set SCSI Status
2020 * and queue the response to $FABRIC_MOD.
2021 *
2022 * Uses linux/include/scsi/scsi.h SAM status codes defs
2023 */
2024 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2025 /*
2026 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2027 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2028 * CONFLICT STATUS.
2029 *
2030 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2031 */
e3d6f909
AG		 2032 if (cmd->se_sess &&
2033 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2034 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 2035 cmd->orig_fe_lun, 0x2C,
2036 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2037
07bde79a
NB		 2038 ret = cmd->se_tfo->queue_status(cmd);
2039 if (ret == -EAGAIN)
2040 goto queue_full;
c66ac9db
NB		 2041 goto check_stop;
2042 case PYX_TRANSPORT_USE_SENSE_REASON:
2043 /*
2044 * struct se_cmd->scsi_sense_reason already set
2045 */
2046 break;
2047 default:
6708bb27 2048 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
a1d8b49a 2049 cmd->t_task_cdb[0],
c66ac9db
NB		 2050 cmd->transport_error_status);
2051 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
2052 break;
2053 }
16ab8e60
NB		 2054 /*
2055 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
2056 * make the call to transport_send_check_condition_and_sense()
2057 * directly. Otherwise expect the fabric to make the call to
2058 * transport_send_check_condition_and_sense() after handling
2059 * possible unsoliticied write data payloads.
2060 */
2061 if (!sc && !cmd->se_tfo->new_cmd_map)
c66ac9db 2062 transport_new_cmd_failure(cmd);
07bde79a
NB		 2063 else {
2064 ret = transport_send_check_condition_and_sense(cmd,
2065 cmd->scsi_sense_reason, 0);
2066 if (ret == -EAGAIN)
2067 goto queue_full;
2068 }
2069
c66ac9db
NB		 2070check_stop:
2071 transport_lun_remove_cmd(cmd);
6708bb27 2072 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 2073 ;
07bde79a
NB		 2074 return;
2075
2076queue_full:
2077 cmd->t_state = TRANSPORT_COMPLETE_OK;
2078 transport_handle_queue_full(cmd, cmd->se_dev, transport_complete_qf);
c66ac9db
NB		 2079}
2080
2081static void transport_direct_request_timeout(struct se_cmd *cmd)
2082{
2083 unsigned long flags;
2084
a1d8b49a 2085 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 2086 if (!atomic_read(&cmd->t_transport_timeout)) {
a1d8b49a 2087 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2088 return;
2089 }
a1d8b49a
AG		 2090 if (atomic_read(&cmd->t_task_cdbs_timeout_left)) {
2091 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2092 return;
2093 }
2094
a1d8b49a
AG		 2095 atomic_sub(atomic_read(&cmd->t_transport_timeout),
2096 &cmd->t_se_count);
2097 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2098}
2099
2100static void transport_generic_request_timeout(struct se_cmd *cmd)
2101{
2102 unsigned long flags;
2103
2104 /*
a1d8b49a 2105 * Reset cmd->t_se_count to allow transport_generic_remove()
c66ac9db
NB		 2106 * to allow last call to free memory resources.
2107 */
a1d8b49a
AG		 2108 spin_lock_irqsave(&cmd->t_state_lock, flags);
2109 if (atomic_read(&cmd->t_transport_timeout) > 1) {
2110 int tmp = (atomic_read(&cmd->t_transport_timeout) - 1);
c66ac9db 2111
a1d8b49a 2112 atomic_sub(tmp, &cmd->t_se_count);
c66ac9db 2113 }
a1d8b49a 2114 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2115
35462975 2116 transport_generic_remove(cmd, 0);
c66ac9db
NB		 2117}
2118
c66ac9db
NB		 2119static inline u32 transport_lba_21(unsigned char *cdb)
2120{
2121 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2122}
2123
2124static inline u32 transport_lba_32(unsigned char *cdb)
2125{
2126 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2127}
2128
2129static inline unsigned long long transport_lba_64(unsigned char *cdb)
2130{
2131 unsigned int __v1, __v2;
2132
2133 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2134 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2135
2136 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2137}
2138
2139/*
2140 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2141 */
2142static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2143{
2144 unsigned int __v1, __v2;
2145
2146 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2147 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2148
2149 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2150}
2151
2152static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2153{
2154 unsigned long flags;
2155
a1d8b49a 2156 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 2157 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 2158 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2159}
2160
2161/*
2162 * Called from interrupt context.
2163 */
2164static void transport_task_timeout_handler(unsigned long data)
2165{
2166 struct se_task *task = (struct se_task *)data;
e3d6f909 2167 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db
NB		 2168 unsigned long flags;
2169
6708bb27 2170 pr_debug("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
c66ac9db 2171
a1d8b49a 2172 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2173 if (task->task_flags & TF_STOP) {
a1d8b49a 2174 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2175 return;
2176 }
2177 task->task_flags &= ~TF_RUNNING;
2178
2179 /*
2180 * Determine if transport_complete_task() has already been called.
2181 */
6708bb27
AG		 2182 if (!atomic_read(&task->task_active)) {
2183 pr_debug("transport task: %p cmd: %p timeout task_active"
c66ac9db 2184 " == 0\n", task, cmd);
a1d8b49a 2185 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2186 return;
2187 }
2188
a1d8b49a
AG		 2189 atomic_inc(&cmd->t_se_count);
2190 atomic_inc(&cmd->t_transport_timeout);
2191 cmd->t_tasks_failed = 1;
c66ac9db
NB		 2192
2193 atomic_set(&task->task_timeout, 1);
2194 task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
2195 task->task_scsi_status = 1;
2196
2197 if (atomic_read(&task->task_stop)) {
6708bb27 2198 pr_debug("transport task: %p cmd: %p timeout task_stop"
c66ac9db 2199 " == 1\n", task, cmd);
a1d8b49a 2200 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2201 complete(&task->task_stop_comp);
2202 return;
2203 }
2204
6708bb27
AG		 2205 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
2206 pr_debug("transport task: %p cmd: %p timeout non zero"
c66ac9db 2207 " t_task_cdbs_left\n", task, cmd);
a1d8b49a 2208 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2209 return;
2210 }
6708bb27 2211 pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
c66ac9db
NB		 2212 task, cmd);
2213
2214 cmd->t_state = TRANSPORT_COMPLETE_FAILURE;
a1d8b49a 2215 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2216
2217 transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE);
2218}
2219
2220/*
a1d8b49a 2221 * Called with cmd->t_state_lock held.
c66ac9db
NB		 2222 */
2223static void transport_start_task_timer(struct se_task *task)
2224{
2225 struct se_device *dev = task->se_dev;
2226 int timeout;
2227
2228 if (task->task_flags & TF_RUNNING)
2229 return;
2230 /*
2231 * If the task_timeout is disabled, exit now.
2232 */
e3d6f909 2233 timeout = dev->se_sub_dev->se_dev_attrib.task_timeout;
6708bb27 2234 if (!timeout)
c66ac9db
NB		 2235 return;
2236
2237 init_timer(&task->task_timer);
2238 task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
2239 task->task_timer.data = (unsigned long) task;
2240 task->task_timer.function = transport_task_timeout_handler;
2241
2242 task->task_flags |= TF_RUNNING;
2243 add_timer(&task->task_timer);
2244#if 0
6708bb27 2245 pr_debug("Starting task timer for cmd: %p task: %p seconds:"
c66ac9db
NB		 2246 " %d\n", task->task_se_cmd, task, timeout);
2247#endif
2248}
2249
2250/*
a1d8b49a 2251 * Called with spin_lock_irq(&cmd->t_state_lock) held.
c66ac9db
NB		 2252 */
2253void __transport_stop_task_timer(struct se_task *task, unsigned long *flags)
2254{
e3d6f909 2255 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db 2256
6708bb27 2257 if (!task->task_flags & TF_RUNNING)
c66ac9db
NB		 2258 return;
2259
2260 task->task_flags |= TF_STOP;
a1d8b49a 2261 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
c66ac9db
NB		 2262
2263 del_timer_sync(&task->task_timer);
2264
a1d8b49a 2265 spin_lock_irqsave(&cmd->t_state_lock, *flags);
c66ac9db
NB		 2266 task->task_flags &= ~TF_RUNNING;
2267 task->task_flags &= ~TF_STOP;
2268}
2269
2270static void transport_stop_all_task_timers(struct se_cmd *cmd)
2271{
2272 struct se_task *task = NULL, *task_tmp;
2273 unsigned long flags;
2274
a1d8b49a 2275 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2276 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2277 &cmd->t_task_list, t_list)
c66ac9db 2278 __transport_stop_task_timer(task, &flags);
a1d8b49a 2279 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2280}
2281
2282static inline int transport_tcq_window_closed(struct se_device *dev)
2283{
2284 if (dev->dev_tcq_window_closed++ <
2285 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
2286 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
2287 } else
2288 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
2289
e3d6f909 2290 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 2291 return 0;
2292}
2293
2294/*
2295 * Called from Fabric Module context from transport_execute_tasks()
2296 *
2297 * The return of this function determins if the tasks from struct se_cmd
2298 * get added to the execution queue in transport_execute_tasks(),
2299 * or are added to the delayed or ordered lists here.
2300 */
2301static inline int transport_execute_task_attr(struct se_cmd *cmd)
2302{
5951146d 2303 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 2304 return 1;
2305 /*
25985edc 2306 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 2307 * to allow the passed struct se_cmd list of tasks to the front of the list.
2308 */
e66ecd50 2309 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
5951146d 2310 atomic_inc(&cmd->se_dev->dev_hoq_count);
c66ac9db 2311 smp_mb__after_atomic_inc();
6708bb27 2312 pr_debug("Added HEAD_OF_QUEUE for CDB:"
c66ac9db 2313 " 0x%02x, se_ordered_id: %u\n",
6708bb27 2314 cmd->t_task_cdb[0],
c66ac9db
NB		 2315 cmd->se_ordered_id);
2316 return 1;
e66ecd50 2317 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d
AG		 2318 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2319 list_add_tail(&cmd->se_ordered_node,
2320 &cmd->se_dev->ordered_cmd_list);
2321 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
c66ac9db 2322
5951146d 2323 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 2324 smp_mb__after_atomic_inc();
2325
6708bb27 2326 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 2327 " list, se_ordered_id: %u\n",
a1d8b49a 2328 cmd->t_task_cdb[0],
c66ac9db
NB		 2329 cmd->se_ordered_id);
2330 /*
2331 * Add ORDERED command to tail of execution queue if
2332 * no other older commands exist that need to be
2333 * completed first.
2334 */
6708bb27 2335 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 2336 return 1;
2337 } else {
2338 /*
2339 * For SIMPLE and UNTAGGED Task Attribute commands
2340 */
5951146d 2341 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 2342 smp_mb__after_atomic_inc();
2343 }
2344 /*
2345 * Otherwise if one or more outstanding ORDERED task attribute exist,
2346 * add the dormant task(s) built for the passed struct se_cmd to the
2347 * execution queue and become in Active state for this struct se_device.
2348 */
5951146d 2349 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 2350 /*
2351 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 2352 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 2353 */
5951146d 2354 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2355 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 2356 list_add_tail(&cmd->se_delayed_node,
2357 &cmd->se_dev->delayed_cmd_list);
2358 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2359
6708bb27 2360 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 2361 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 2362 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 2363 cmd->se_ordered_id);
2364 /*
2365 * Return zero to let transport_execute_tasks() know
2366 * not to add the delayed tasks to the execution list.
2367 */
2368 return 0;
2369 }
2370 /*
2371 * Otherwise, no ORDERED task attributes exist..
2372 */
2373 return 1;
2374}
2375
2376/*
2377 * Called from fabric module context in transport_generic_new_cmd() and
2378 * transport_generic_process_write()
2379 */
2380static int transport_execute_tasks(struct se_cmd *cmd)
2381{
2382 int add_tasks;
2383
db1620a2
CH		 2384 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2385 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
2386 transport_generic_request_failure(cmd, NULL, 0, 1);
2387 return 0;
c66ac9db 2388 }
db1620a2 2389
c66ac9db
NB		 2390 /*
2391 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2392 * has occurred that prevents execution.
c66ac9db 2393 */
6708bb27 2394 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 2395 /*
2396 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2397 * attribute for the tasks of the received struct se_cmd CDB
2398 */
2399 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2400 if (!add_tasks)
c66ac9db
NB		 2401 goto execute_tasks;
2402 /*
2403 * This calls transport_add_tasks_from_cmd() to handle
2404 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2405 * (if enabled) in __transport_add_task_to_execute_queue() and
2406 * transport_add_task_check_sam_attr().
2407 */
2408 transport_add_tasks_from_cmd(cmd);
2409 }
2410 /*
2411 * Kick the execution queue for the cmd associated struct se_device
2412 * storage object.
2413 */
2414execute_tasks:
5951146d 2415 __transport_execute_tasks(cmd->se_dev);
c66ac9db
NB		 2416 return 0;
2417}
2418
2419/*
2420 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2421 * from struct se_device->execute_task_list and
2422 *
2423 * Called from transport_processing_thread()
2424 */
2425static int __transport_execute_tasks(struct se_device *dev)
2426{
2427 int error;
2428 struct se_cmd *cmd = NULL;
e3d6f909 2429 struct se_task *task = NULL;
c66ac9db
NB		 2430 unsigned long flags;
2431
2432 /*
2433 * Check if there is enough room in the device and HBA queue to send
a1d8b49a 2434 * struct se_tasks to the selected transport.
c66ac9db
NB		 2435 */
2436check_depth:
e3d6f909 2437 if (!atomic_read(&dev->depth_left))
c66ac9db 2438 return transport_tcq_window_closed(dev);
c66ac9db 2439
e3d6f909 2440 dev->dev_tcq_window_closed = 0;
c66ac9db 2441
e3d6f909
AG		 2442 spin_lock_irq(&dev->execute_task_lock);
2443 if (list_empty(&dev->execute_task_list)) {
2444 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2445 return 0;
2446 }
e3d6f909
AG		 2447 task = list_first_entry(&dev->execute_task_list,
2448 struct se_task, t_execute_list);
2449 list_del(&task->t_execute_list);
2450 atomic_set(&task->task_execute_queue, 0);
2451 atomic_dec(&dev->execute_tasks);
2452 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2453
2454 atomic_dec(&dev->depth_left);
c66ac9db 2455
e3d6f909 2456 cmd = task->task_se_cmd;
c66ac9db 2457
a1d8b49a 2458 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 2459 atomic_set(&task->task_active, 1);
2460 atomic_set(&task->task_sent, 1);
a1d8b49a 2461 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2462
a1d8b49a
AG		 2463 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2464 cmd->t_task_list_num)
c66ac9db
NB		 2465 atomic_set(&cmd->transport_sent, 1);
2466
2467 transport_start_task_timer(task);
a1d8b49a 2468 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2469 /*
2470 * The struct se_cmd->transport_emulate_cdb() function pointer is used
e3d6f909 2471 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
c66ac9db
NB		 2472 * struct se_subsystem_api->do_task() caller below.
2473 */
2474 if (cmd->transport_emulate_cdb) {
2475 error = cmd->transport_emulate_cdb(cmd);
2476 if (error != 0) {
2477 cmd->transport_error_status = error;
2478 atomic_set(&task->task_active, 0);
2479 atomic_set(&cmd->transport_sent, 0);
2480 transport_stop_tasks_for_cmd(cmd);
2481 transport_generic_request_failure(cmd, dev, 0, 1);
2482 goto check_depth;
2483 }
2484 /*
2485 * Handle the successful completion for transport_emulate_cdb()
2486 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2487 * Otherwise the caller is expected to complete the task with
2488 * proper status.
2489 */
2490 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2491 cmd->scsi_status = SAM_STAT_GOOD;
2492 task->task_scsi_status = GOOD;
2493 transport_complete_task(task, 1);
2494 }
2495 } else {
2496 /*
2497 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2498 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2499 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2500 * LUN emulation code.
2501 *
2502 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2503 * call ->do_task() directly and let the underlying TCM subsystem plugin
2504 * code handle the CDB emulation.
2505 */
e3d6f909
AG		 2506 if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2507 (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
c66ac9db
NB		 2508 error = transport_emulate_control_cdb(task);
2509 else
e3d6f909 2510 error = dev->transport->do_task(task);
c66ac9db
NB		 2511
2512 if (error != 0) {
2513 cmd->transport_error_status = error;
2514 atomic_set(&task->task_active, 0);
2515 atomic_set(&cmd->transport_sent, 0);
2516 transport_stop_tasks_for_cmd(cmd);
2517 transport_generic_request_failure(cmd, dev, 0, 1);
2518 }
2519 }
2520
2521 goto check_depth;
2522
2523 return 0;
2524}
2525
2526void transport_new_cmd_failure(struct se_cmd *se_cmd)
2527{
2528 unsigned long flags;
2529 /*
2530 * Any unsolicited data will get dumped for failed command inside of
2531 * the fabric plugin
2532 */
a1d8b49a 2533 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2534 se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2535 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
a1d8b49a 2536 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2537}
2538
2539static void transport_nop_wait_for_tasks(struct se_cmd *, int, int);
2540
2541static inline u32 transport_get_sectors_6(
2542 unsigned char *cdb,
2543 struct se_cmd *cmd,
2544 int *ret)
2545{
5951146d 2546 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2547
2548 /*
2549 * Assume TYPE_DISK for non struct se_device objects.
2550 * Use 8-bit sector value.
2551 */
2552 if (!dev)
2553 goto type_disk;
2554
2555 /*
2556 * Use 24-bit allocation length for TYPE_TAPE.
2557 */
e3d6f909 2558 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2559 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2560
2561 /*
2562 * Everything else assume TYPE_DISK Sector CDB location.
2563 * Use 8-bit sector value.
2564 */
2565type_disk:
2566 return (u32)cdb[4];
2567}
2568
2569static inline u32 transport_get_sectors_10(
2570 unsigned char *cdb,
2571 struct se_cmd *cmd,
2572 int *ret)
2573{
5951146d 2574 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2575
2576 /*
2577 * Assume TYPE_DISK for non struct se_device objects.
2578 * Use 16-bit sector value.
2579 */
2580 if (!dev)
2581 goto type_disk;
2582
2583 /*
2584 * XXX_10 is not defined in SSC, throw an exception
2585 */
e3d6f909
AG		 2586 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2587 *ret = -EINVAL;
c66ac9db
NB		 2588 return 0;
2589 }
2590
2591 /*
2592 * Everything else assume TYPE_DISK Sector CDB location.
2593 * Use 16-bit sector value.
2594 */
2595type_disk:
2596 return (u32)(cdb[7] << 8) + cdb[8];
2597}
2598
2599static inline u32 transport_get_sectors_12(
2600 unsigned char *cdb,
2601 struct se_cmd *cmd,
2602 int *ret)
2603{
5951146d 2604 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2605
2606 /*
2607 * Assume TYPE_DISK for non struct se_device objects.
2608 * Use 32-bit sector value.
2609 */
2610 if (!dev)
2611 goto type_disk;
2612
2613 /*
2614 * XXX_12 is not defined in SSC, throw an exception
2615 */
e3d6f909
AG		 2616 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2617 *ret = -EINVAL;
c66ac9db
NB		 2618 return 0;
2619 }
2620
2621 /*
2622 * Everything else assume TYPE_DISK Sector CDB location.
2623 * Use 32-bit sector value.
2624 */
2625type_disk:
2626 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2627}
2628
2629static inline u32 transport_get_sectors_16(
2630 unsigned char *cdb,
2631 struct se_cmd *cmd,
2632 int *ret)
2633{
5951146d 2634 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2635
2636 /*
2637 * Assume TYPE_DISK for non struct se_device objects.
2638 * Use 32-bit sector value.
2639 */
2640 if (!dev)
2641 goto type_disk;
2642
2643 /*
2644 * Use 24-bit allocation length for TYPE_TAPE.
2645 */
e3d6f909 2646 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2647 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2648
2649type_disk:
2650 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2651 (cdb[12] << 8) + cdb[13];
2652}
2653
2654/*
2655 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2656 */
2657static inline u32 transport_get_sectors_32(
2658 unsigned char *cdb,
2659 struct se_cmd *cmd,
2660 int *ret)
2661{
2662 /*
2663 * Assume TYPE_DISK for non struct se_device objects.
2664 * Use 32-bit sector value.
2665 */
2666 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2667 (cdb[30] << 8) + cdb[31];
2668
2669}
2670
2671static inline u32 transport_get_size(
2672 u32 sectors,
2673 unsigned char *cdb,
2674 struct se_cmd *cmd)
2675{
5951146d 2676 struct se_device *dev = cmd->se_dev;
c66ac9db 2677
e3d6f909 2678 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2679 if (cdb[1] & 1) { /* sectors */
e3d6f909 2680 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2681 } else /* bytes */
2682 return sectors;
2683 }
2684#if 0
6708bb27 2685 pr_debug("Returning block_size: %u, sectors: %u == %u for"
e3d6f909
AG		 2686 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2687 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2688 dev->transport->name);
c66ac9db 2689#endif
e3d6f909 2690 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2691}
2692
c66ac9db
NB		 2693static void transport_xor_callback(struct se_cmd *cmd)
2694{
2695 unsigned char *buf, *addr;
ec98f782 2696 struct scatterlist *sg;
c66ac9db
NB		 2697 unsigned int offset;
2698 int i;
ec98f782 2699 int count;
c66ac9db
NB		 2700 /*
2701 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2702 *
2703 * 1) read the specified logical block(s);
2704 * 2) transfer logical blocks from the data-out buffer;
2705 * 3) XOR the logical blocks transferred from the data-out buffer with
2706 * the logical blocks read, storing the resulting XOR data in a buffer;
2707 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2708 * blocks transferred from the data-out buffer; and
2709 * 5) transfer the resulting XOR data to the data-in buffer.
2710 */
2711 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2712 if (!buf) {
2713 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2714 return;
2715 }
2716 /*
ec98f782 2717 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2718 * into the locally allocated *buf
2719 */
ec98f782
AG		 2720 sg_copy_to_buffer(cmd->t_data_sg,
2721 cmd->t_data_nents,
2722 buf,
2723 cmd->data_length);
2724
c66ac9db
NB		 2725 /*
2726 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2727 * cmd->t_mem_bidi_list
c66ac9db
NB		 2728 */
2729
2730 offset = 0;
ec98f782
AG		 2731 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2732 addr = kmap_atomic(sg_page(sg), KM_USER0);
2733 if (!addr)
c66ac9db
NB		 2734 goto out;
2735
ec98f782
AG		 2736 for (i = 0; i < sg->length; i++)
2737 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2738
ec98f782 2739 offset += sg->length;
c66ac9db
NB		 2740 kunmap_atomic(addr, KM_USER0);
2741 }
ec98f782 2742
c66ac9db
NB		 2743out:
2744 kfree(buf);
2745}
2746
2747/*
2748 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2749 */
2750static int transport_get_sense_data(struct se_cmd *cmd)
2751{
2752 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2753 struct se_device *dev;
2754 struct se_task *task = NULL, *task_tmp;
2755 unsigned long flags;
2756 u32 offset = 0;
2757
e3d6f909
AG		 2758 WARN_ON(!cmd->se_lun);
2759
a1d8b49a 2760 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2761 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2762 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2763 return 0;
2764 }
2765
2766 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2767 &cmd->t_task_list, t_list) {
c66ac9db
NB		 2768
2769 if (!task->task_sense)
2770 continue;
2771
2772 dev = task->se_dev;
6708bb27 2773 if (!dev)
c66ac9db
NB		 2774 continue;
2775
e3d6f909 2776 if (!dev->transport->get_sense_buffer) {
6708bb27 2777 pr_err("dev->transport->get_sense_buffer"
c66ac9db
NB		 2778 " is NULL\n");
2779 continue;
2780 }
2781
e3d6f909 2782 sense_buffer = dev->transport->get_sense_buffer(task);
6708bb27
AG		 2783 if (!sense_buffer) {
2784 pr_err("ITT[0x%08x]_TASK[%d]: Unable to locate"
c66ac9db 2785 " sense buffer for task with sense\n",
e3d6f909 2786 cmd->se_tfo->get_task_tag(cmd), task->task_no);
c66ac9db
NB		 2787 continue;
2788 }
a1d8b49a 2789 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2790
e3d6f909 2791 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2792 TRANSPORT_SENSE_BUFFER);
2793
5951146d 2794 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2795 TRANSPORT_SENSE_BUFFER);
2796 cmd->scsi_status = task->task_scsi_status;
2797 /* Automatically padded */
2798 cmd->scsi_sense_length =
2799 (TRANSPORT_SENSE_BUFFER + offset);
2800
6708bb27 2801 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
c66ac9db 2802 " and sense\n",
e3d6f909 2803 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2804 cmd->scsi_status);
2805 return 0;
2806 }
a1d8b49a 2807 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2808
2809 return -1;
2810}
2811
c66ac9db
NB		 2812static int
2813transport_handle_reservation_conflict(struct se_cmd *cmd)
2814{
2815 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
2816 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2817 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2818 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2819 /*
2820 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2821 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2822 * CONFLICT STATUS.
2823 *
2824 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2825 */
e3d6f909
AG		 2826 if (cmd->se_sess &&
2827 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2828 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 2829 cmd->orig_fe_lun, 0x2C,
2830 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
5951146d 2831 return -EINVAL;
c66ac9db
NB		 2832}
2833
ec98f782
AG		 2834static inline long long transport_dev_end_lba(struct se_device *dev)
2835{
2836 return dev->transport->get_blocks(dev) + 1;
2837}
2838
2839static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2840{
2841 struct se_device *dev = cmd->se_dev;
2842 u32 sectors;
2843
2844 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2845 return 0;
2846
2847 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2848
6708bb27
AG		 2849 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2850 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2851 " transport_dev_end_lba(): %llu\n",
2852 cmd->t_task_lba, sectors,
2853 transport_dev_end_lba(dev));
7abbe7f3 2854 return -EINVAL;
ec98f782
AG		 2855 }
2856
7abbe7f3 2857 return 0;
ec98f782
AG		 2858}
2859
706d5860
NB		 2860static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2861{
2862 /*
2863 * Determine if the received WRITE_SAME is used to for direct
2864 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2865 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2866 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2867 */
2868 int passthrough = (dev->transport->transport_type ==
2869 TRANSPORT_PLUGIN_PHBA_PDEV);
2870
2871 if (!passthrough) {
2872 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2873 pr_err("WRITE_SAME PBDATA and LBDATA"
2874 " bits not supported for Block Discard"
2875 " Emulation\n");
2876 return -ENOSYS;
2877 }
2878 /*
2879 * Currently for the emulated case we only accept
2880 * tpws with the UNMAP=1 bit set.
2881 */
2882 if (!(flags[0] & 0x08)) {
2883 pr_err("WRITE_SAME w/o UNMAP bit not"
2884 " supported for Block Discard Emulation\n");
2885 return -ENOSYS;
2886 }
2887 }
2888
2889 return 0;
2890}
2891
c66ac9db
NB		 2892/* transport_generic_cmd_sequencer():
2893 *
2894 * Generic Command Sequencer that should work for most DAS transport
2895 * drivers.
2896 *
2897 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2898 * RX Thread.
2899 *
2900 * FIXME: Need to support other SCSI OPCODES where as well.
2901 */
2902static int transport_generic_cmd_sequencer(
2903 struct se_cmd *cmd,
2904 unsigned char *cdb)
2905{
5951146d 2906 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2907 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2908 int ret = 0, sector_ret = 0, passthrough;
2909 u32 sectors = 0, size = 0, pr_reg_type = 0;
2910 u16 service_action;
2911 u8 alua_ascq = 0;
2912 /*
2913 * Check for an existing UNIT ATTENTION condition
2914 */
2915 if (core_scsi3_ua_check(cmd, cdb) < 0) {
2916 cmd->transport_wait_for_tasks =
2917 &transport_nop_wait_for_tasks;
2918 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2919 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2920 return -EINVAL;
c66ac9db
NB		 2921 }
2922 /*
2923 * Check status of Asymmetric Logical Unit Assignment port
2924 */
e3d6f909 2925 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db
NB		 2926 if (ret != 0) {
2927 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
2928 /*
25985edc 2929 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2930 * The ALUA additional sense code qualifier (ASCQ) is determined
2931 * by the ALUA primary or secondary access state..
2932 */
2933 if (ret > 0) {
2934#if 0
6708bb27 2935 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2936 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2937 cmd->se_tfo->get_fabric_name(), alua_ascq);
c66ac9db
NB		 2938#endif
2939 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2940 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2941 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2942 return -EINVAL;
c66ac9db
NB		 2943 }
2944 goto out_invalid_cdb_field;
2945 }
2946 /*
2947 * Check status for SPC-3 Persistent Reservations
2948 */
e3d6f909
AG		 2949 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2950 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
c66ac9db
NB		 2951 cmd, cdb, pr_reg_type) != 0)
2952 return transport_handle_reservation_conflict(cmd);
2953 /*
2954 * This means the CDB is allowed for the SCSI Initiator port
2955 * when said port is *NOT* holding the legacy SPC-2 or
2956 * SPC-3 Persistent Reservation.
2957 */
2958 }
2959
2960 switch (cdb[0]) {
2961 case READ_6:
2962 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2963 if (sector_ret)
2964 goto out_unsupported_cdb;
2965 size = transport_get_size(sectors, cdb, cmd);
2966 cmd->transport_split_cdb = &split_cdb_XX_6;
a1d8b49a 2967 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2968 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2969 break;
2970 case READ_10:
2971 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2972 if (sector_ret)
2973 goto out_unsupported_cdb;
2974 size = transport_get_size(sectors, cdb, cmd);
2975 cmd->transport_split_cdb = &split_cdb_XX_10;
a1d8b49a 2976 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2977 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2978 break;
2979 case READ_12:
2980 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2981 if (sector_ret)
2982 goto out_unsupported_cdb;
2983 size = transport_get_size(sectors, cdb, cmd);
2984 cmd->transport_split_cdb = &split_cdb_XX_12;
a1d8b49a 2985 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2986 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2987 break;
2988 case READ_16:
2989 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2990 if (sector_ret)
2991 goto out_unsupported_cdb;
2992 size = transport_get_size(sectors, cdb, cmd);
2993 cmd->transport_split_cdb = &split_cdb_XX_16;
a1d8b49a 2994 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2995 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2996 break;
2997 case WRITE_6:
2998 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2999 if (sector_ret)
3000 goto out_unsupported_cdb;
3001 size = transport_get_size(sectors, cdb, cmd);
3002 cmd->transport_split_cdb = &split_cdb_XX_6;
a1d8b49a 3003 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 3004 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3005 break;
3006 case WRITE_10:
3007 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3008 if (sector_ret)
3009 goto out_unsupported_cdb;
3010 size = transport_get_size(sectors, cdb, cmd);
3011 cmd->transport_split_cdb = &split_cdb_XX_10;
a1d8b49a
AG		 3012 cmd->t_task_lba = transport_lba_32(cdb);
3013 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 3014 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3015 break;
3016 case WRITE_12:
3017 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
3018 if (sector_ret)
3019 goto out_unsupported_cdb;
3020 size = transport_get_size(sectors, cdb, cmd);
3021 cmd->transport_split_cdb = &split_cdb_XX_12;
a1d8b49a
AG		 3022 cmd->t_task_lba = transport_lba_32(cdb);
3023 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 3024 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3025 break;
3026 case WRITE_16:
3027 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3028 if (sector_ret)
3029 goto out_unsupported_cdb;
3030 size = transport_get_size(sectors, cdb, cmd);
3031 cmd->transport_split_cdb = &split_cdb_XX_16;
a1d8b49a
AG		 3032 cmd->t_task_lba = transport_lba_64(cdb);
3033 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 3034 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3035 break;
3036 case XDWRITEREAD_10:
3037 if ((cmd->data_direction != DMA_TO_DEVICE) ||
a1d8b49a 3038 !(cmd->t_tasks_bidi))
c66ac9db
NB		 3039 goto out_invalid_cdb_field;
3040 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3041 if (sector_ret)
3042 goto out_unsupported_cdb;
3043 size = transport_get_size(sectors, cdb, cmd);
3044 cmd->transport_split_cdb = &split_cdb_XX_10;
a1d8b49a 3045 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 3046 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
e3d6f909 3047 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 3048 TRANSPORT_PLUGIN_PHBA_PDEV);
3049 /*
3050 * Skip the remaining assignments for TCM/PSCSI passthrough
3051 */
3052 if (passthrough)
3053 break;
3054 /*
3055 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
3056 */
3057 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 3058 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 3059 break;
3060 case VARIABLE_LENGTH_CMD:
3061 service_action = get_unaligned_be16(&cdb[8]);
3062 /*
3063 * Determine if this is TCM/PSCSI device and we should disable
3064 * internal emulation for this CDB.
3065 */
e3d6f909 3066 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 3067 TRANSPORT_PLUGIN_PHBA_PDEV);
3068
3069 switch (service_action) {
3070 case XDWRITEREAD_32:
3071 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
3072 if (sector_ret)
3073 goto out_unsupported_cdb;
3074 size = transport_get_size(sectors, cdb, cmd);
3075 /*
3076 * Use WRITE_32 and READ_32 opcodes for the emulated
3077 * XDWRITE_READ_32 logic.
3078 */
3079 cmd->transport_split_cdb = &split_cdb_XX_32;
a1d8b49a 3080 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 3081 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3082
3083 /*
3084 * Skip the remaining assignments for TCM/PSCSI passthrough
3085 */
3086 if (passthrough)
3087 break;
3088
3089 /*
3090 * Setup BIDI XOR callback to be run during
3091 * transport_generic_complete_ok()
3092 */
3093 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 3094 cmd->t_tasks_fua = (cdb[10] & 0x8);
c66ac9db
NB		 3095 break;
3096 case WRITE_SAME_32:
3097 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
3098 if (sector_ret)
3099 goto out_unsupported_cdb;
dd3a5ad8 3100
6708bb27 3101 if (sectors)
12850626 3102 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 3103 else {
3104 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
3105 " supported\n");
3106 goto out_invalid_cdb_field;
3107 }
dd3a5ad8 3108
a1d8b49a 3109 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 3110 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3111
706d5860 3112 if (target_check_write_same_discard(&cdb[10], dev) < 0)
c66ac9db 3113 goto out_invalid_cdb_field;
706d5860 3114
c66ac9db
NB		 3115 break;
3116 default:
6708bb27 3117 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 3118 " 0x%04x not supported\n", service_action);
3119 goto out_unsupported_cdb;
3120 }
3121 break;
e434f1f1 3122 case MAINTENANCE_IN:
e3d6f909 3123 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 3124 /* MAINTENANCE_IN from SCC-2 */
3125 /*
3126 * Check for emulated MI_REPORT_TARGET_PGS.
3127 */
3128 if (cdb[1] == MI_REPORT_TARGET_PGS) {
3129 cmd->transport_emulate_cdb =
e3d6f909 3130 (su_dev->t10_alua.alua_type ==
c66ac9db 3131 SPC3_ALUA_EMULATED) ?
e3d6f909 3132 core_emulate_report_target_port_groups :
c66ac9db
NB		 3133 NULL;
3134 }
3135 size = (cdb[6] << 24) | (cdb[7] << 16) |
3136 (cdb[8] << 8) | cdb[9];
3137 } else {
3138 /* GPCMD_SEND_KEY from multi media commands */
3139 size = (cdb[8] << 8) + cdb[9];
3140 }
05d1c7c0 3141 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3142 break;
3143 case MODE_SELECT:
3144 size = cdb[4];
3145 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3146 break;
3147 case MODE_SELECT_10:
3148 size = (cdb[7] << 8) + cdb[8];
3149 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3150 break;
3151 case MODE_SENSE:
3152 size = cdb[4];
05d1c7c0 3153 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3154 break;
3155 case MODE_SENSE_10:
3156 case GPCMD_READ_BUFFER_CAPACITY:
3157 case GPCMD_SEND_OPC:
3158 case LOG_SELECT:
3159 case LOG_SENSE:
3160 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 3161 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3162 break;
3163 case READ_BLOCK_LIMITS:
3164 size = READ_BLOCK_LEN;
05d1c7c0 3165 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3166 break;
3167 case GPCMD_GET_CONFIGURATION:
3168 case GPCMD_READ_FORMAT_CAPACITIES:
3169 case GPCMD_READ_DISC_INFO:
3170 case GPCMD_READ_TRACK_RZONE_INFO:
3171 size = (cdb[7] << 8) + cdb[8];
3172 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3173 break;
3174 case PERSISTENT_RESERVE_IN:
3175 case PERSISTENT_RESERVE_OUT:
3176 cmd->transport_emulate_cdb =
e3d6f909 3177 (su_dev->t10_pr.res_type ==
c66ac9db 3178 SPC3_PERSISTENT_RESERVATIONS) ?
e3d6f909 3179 core_scsi3_emulate_pr : NULL;
c66ac9db 3180 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 3181 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3182 break;
3183 case GPCMD_MECHANISM_STATUS:
3184 case GPCMD_READ_DVD_STRUCTURE:
3185 size = (cdb[8] << 8) + cdb[9];
3186 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3187 break;
3188 case READ_POSITION:
3189 size = READ_POSITION_LEN;
05d1c7c0 3190 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 3191 break;
e434f1f1 3192 case MAINTENANCE_OUT:
e3d6f909 3193 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 3194 /* MAINTENANCE_OUT from SCC-2
3195 *
3196 * Check for emulated MO_SET_TARGET_PGS.
3197 */
3198 if (cdb[1] == MO_SET_TARGET_PGS) {
3199 cmd->transport_emulate_cdb =
e3d6f909 3200 (su_dev->t10_alua.alua_type ==
c66ac9db 3201 SPC3_ALUA_EMULATED) ?
e3d6f909 3202 core_emulate_set_target_port_groups :
c66ac9db
NB		 3203 NULL;
3204 }
3205
3206 size = (cdb[6] << 24) | (cdb[7] << 16) |
3207 (cdb[8] << 8) | cdb[9];
3208 } else {
3209 /* GPCMD_REPORT_KEY from multi media commands */
3210 size = (cdb[8] << 8) + cdb[9];
3211 }
05d1c7c0 3212 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3213 break;
3214 case INQUIRY:
3215 size = (cdb[3] << 8) + cdb[4];
3216 /*
3217 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3218 * See spc4r17 section 5.3
3219 */
5951146d 3220 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3221 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3222 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3223 break;
3224 case READ_BUFFER:
3225 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 3226 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3227 break;
3228 case READ_CAPACITY:
3229 size = READ_CAP_LEN;
05d1c7c0 3230 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3231 break;
3232 case READ_MEDIA_SERIAL_NUMBER:
3233 case SECURITY_PROTOCOL_IN:
3234 case SECURITY_PROTOCOL_OUT:
3235 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 3236 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3237 break;
3238 case SERVICE_ACTION_IN:
3239 case ACCESS_CONTROL_IN:
3240 case ACCESS_CONTROL_OUT:
3241 case EXTENDED_COPY:
3242 case READ_ATTRIBUTE:
3243 case RECEIVE_COPY_RESULTS:
3244 case WRITE_ATTRIBUTE:
3245 size = (cdb[10] << 24) | (cdb[11] << 16) |
3246 (cdb[12] << 8) | cdb[13];
05d1c7c0 3247 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3248 break;
3249 case RECEIVE_DIAGNOSTIC:
3250 case SEND_DIAGNOSTIC:
3251 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 3252 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3253 break;
3254/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3255#if 0
3256 case GPCMD_READ_CD:
3257 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3258 size = (2336 * sectors);
05d1c7c0 3259 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3260 break;
3261#endif
3262 case READ_TOC:
3263 size = cdb[8];
05d1c7c0 3264 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3265 break;
3266 case REQUEST_SENSE:
3267 size = cdb[4];
05d1c7c0 3268 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3269 break;
3270 case READ_ELEMENT_STATUS:
3271 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 3272 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3273 break;
3274 case WRITE_BUFFER:
3275 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 3276 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3277 break;
3278 case RESERVE:
3279 case RESERVE_10:
3280 /*
3281 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3282 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3283 */
3284 if (cdb[0] == RESERVE_10)
3285 size = (cdb[7] << 8) | cdb[8];
3286 else
3287 size = cmd->data_length;
3288
3289 /*
3290 * Setup the legacy emulated handler for SPC-2 and
3291 * >= SPC-3 compatible reservation handling (CRH=1)
3292 * Otherwise, we assume the underlying SCSI logic is
3293 * is running in SPC_PASSTHROUGH, and wants reservations
3294 * emulation disabled.
3295 */
3296 cmd->transport_emulate_cdb =
e3d6f909 3297 (su_dev->t10_pr.res_type !=
c66ac9db 3298 SPC_PASSTHROUGH) ?
e3d6f909 3299 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 3300 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3301 break;
3302 case RELEASE:
3303 case RELEASE_10:
3304 /*
3305 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3306 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3307 */
3308 if (cdb[0] == RELEASE_10)
3309 size = (cdb[7] << 8) | cdb[8];
3310 else
3311 size = cmd->data_length;
3312
3313 cmd->transport_emulate_cdb =
e3d6f909 3314 (su_dev->t10_pr.res_type !=
c66ac9db 3315 SPC_PASSTHROUGH) ?
e3d6f909 3316 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 3317 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3318 break;
3319 case SYNCHRONIZE_CACHE:
3320 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3321 /*
3322 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3323 */
3324 if (cdb[0] == SYNCHRONIZE_CACHE) {
3325 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 3326 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 3327 } else {
3328 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 3329 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 3330 }
3331 if (sector_ret)
3332 goto out_unsupported_cdb;
3333
3334 size = transport_get_size(sectors, cdb, cmd);
3335 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3336
3337 /*
3338 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3339 */
e3d6f909 3340 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 3341 break;
3342 /*
3343 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3344 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3345 */
3346 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3347 /*
3348 * Check to ensure that LBA + Range does not exceed past end of
7abbe7f3 3349 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
c66ac9db 3350 */
7abbe7f3
NB		 3351 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
3352 if (transport_cmd_get_valid_sectors(cmd) < 0)
3353 goto out_invalid_cdb_field;
3354 }
c66ac9db
NB		 3355 break;
3356 case UNMAP:
3357 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 3358 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3359 break;
3360 case WRITE_SAME_16:
3361 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3362 if (sector_ret)
3363 goto out_unsupported_cdb;
dd3a5ad8 3364
6708bb27 3365 if (sectors)
12850626 3366 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 3367 else {
3368 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3369 goto out_invalid_cdb_field;
3370 }
dd3a5ad8 3371
5db0753b 3372 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
706d5860
NB		 3373 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3374
3375 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3376 goto out_invalid_cdb_field;
3377 break;
3378 case WRITE_SAME:
3379 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3380 if (sector_ret)
3381 goto out_unsupported_cdb;
3382
3383 if (sectors)
12850626 3384 size = transport_get_size(1, cdb, cmd);
706d5860
NB		 3385 else {
3386 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3387 goto out_invalid_cdb_field;
c66ac9db 3388 }
706d5860
NB		 3389
3390 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
c66ac9db 3391 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
706d5860
NB		 3392 /*
3393 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3394 * of byte 1 bit 3 UNMAP instead of original reserved field
3395 */
3396 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3397 goto out_invalid_cdb_field;
c66ac9db
NB		 3398 break;
3399 case ALLOW_MEDIUM_REMOVAL:
3400 case GPCMD_CLOSE_TRACK:
3401 case ERASE:
3402 case INITIALIZE_ELEMENT_STATUS:
3403 case GPCMD_LOAD_UNLOAD:
3404 case REZERO_UNIT:
3405 case SEEK_10:
3406 case GPCMD_SET_SPEED:
3407 case SPACE:
3408 case START_STOP:
3409 case TEST_UNIT_READY:
3410 case VERIFY:
3411 case WRITE_FILEMARKS:
3412 case MOVE_MEDIUM:
3413 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3414 break;
3415 case REPORT_LUNS:
3416 cmd->transport_emulate_cdb =
e3d6f909 3417 transport_core_report_lun_response;
c66ac9db
NB		 3418 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3419 /*
3420 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3421 * See spc4r17 section 5.3
3422 */
5951146d 3423 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3424 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3425 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3426 break;
3427 default:
6708bb27 3428 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 3429 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3430 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3431 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
3432 goto out_unsupported_cdb;
3433 }
3434
3435 if (size != cmd->data_length) {
6708bb27 3436 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 3437 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3438 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3439 cmd->data_length, size, cdb[0]);
3440
3441 cmd->cmd_spdtl = size;
3442
3443 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 3444 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 3445 " WRITE data\n");
3446 goto out_invalid_cdb_field;
3447 }
3448 /*
3449 * Reject READ_* or WRITE_* with overflow/underflow for
3450 * type SCF_SCSI_DATA_SG_IO_CDB.
3451 */
6708bb27
AG		 3452 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3453 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 3454 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3455 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3456 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3457 goto out_invalid_cdb_field;
3458 }
3459
3460 if (size > cmd->data_length) {
3461 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3462 cmd->residual_count = (size - cmd->data_length);
3463 } else {
3464 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3465 cmd->residual_count = (cmd->data_length - size);
3466 }
3467 cmd->data_length = size;
3468 }
3469
d0229ae3
AG		 3470 /* Let's limit control cdbs to a page, for simplicity's sake. */
3471 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3472 size > PAGE_SIZE)
3473 goto out_invalid_cdb_field;
3474
c66ac9db
NB		 3475 transport_set_supported_SAM_opcode(cmd);
3476 return ret;
3477
3478out_unsupported_cdb:
3479 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3480 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3481 return -EINVAL;
c66ac9db
NB		 3482out_invalid_cdb_field:
3483 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3484 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3485 return -EINVAL;
c66ac9db
NB		 3486}
3487
c66ac9db
NB		 3488/*
3489 * Called from transport_generic_complete_ok() and
3490 * transport_generic_request_failure() to determine which dormant/delayed
3491 * and ordered cmds need to have their tasks added to the execution queue.
3492 */
3493static void transport_complete_task_attr(struct se_cmd *cmd)
3494{
5951146d 3495 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3496 struct se_cmd *cmd_p, *cmd_tmp;
3497 int new_active_tasks = 0;
3498
e66ecd50 3499 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3500 atomic_dec(&dev->simple_cmds);
3501 smp_mb__after_atomic_dec();
3502 dev->dev_cur_ordered_id++;
6708bb27 3503 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3504 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3505 cmd->se_ordered_id);
e66ecd50 3506 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 3507 atomic_dec(&dev->dev_hoq_count);
3508 smp_mb__after_atomic_dec();
3509 dev->dev_cur_ordered_id++;
6708bb27 3510 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3511 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3512 cmd->se_ordered_id);
e66ecd50 3513 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db 3514 spin_lock(&dev->ordered_cmd_lock);
5951146d 3515 list_del(&cmd->se_ordered_node);
c66ac9db
NB		 3516 atomic_dec(&dev->dev_ordered_sync);
3517 smp_mb__after_atomic_dec();
3518 spin_unlock(&dev->ordered_cmd_lock);
3519
3520 dev->dev_cur_ordered_id++;
6708bb27 3521 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3522 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3523 }
3524 /*
3525 * Process all commands up to the last received
3526 * ORDERED task attribute which requires another blocking
3527 * boundary
3528 */
3529 spin_lock(&dev->delayed_cmd_lock);
3530 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3531 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3532
5951146d 3533 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3534 spin_unlock(&dev->delayed_cmd_lock);
3535
6708bb27 3536 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3537 " cmd_p: 0x%02x Task Attr: 0x%02x"
3538 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3539 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3540 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3541
3542 transport_add_tasks_from_cmd(cmd_p);
3543 new_active_tasks++;
3544
3545 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3546 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3547 break;
3548 }
3549 spin_unlock(&dev->delayed_cmd_lock);
3550 /*
3551 * If new tasks have become active, wake up the transport thread
3552 * to do the processing of the Active tasks.
3553 */
3554 if (new_active_tasks != 0)
e3d6f909 3555 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3556}
3557
07bde79a
NB		 3558static int transport_complete_qf(struct se_cmd *cmd)
3559{
3560 int ret = 0;
3561
3562 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
3563 return cmd->se_tfo->queue_status(cmd);
3564
3565 switch (cmd->data_direction) {
3566 case DMA_FROM_DEVICE:
3567 ret = cmd->se_tfo->queue_data_in(cmd);
3568 break;
3569 case DMA_TO_DEVICE:
ec98f782 3570 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3571 ret = cmd->se_tfo->queue_data_in(cmd);
3572 if (ret < 0)
3573 return ret;
3574 }
3575 /* Fall through for DMA_TO_DEVICE */
3576 case DMA_NONE:
3577 ret = cmd->se_tfo->queue_status(cmd);
3578 break;
3579 default:
3580 break;
3581 }
3582
3583 return ret;
3584}
3585
3586static void transport_handle_queue_full(
3587 struct se_cmd *cmd,
3588 struct se_device *dev,
3589 int (*qf_callback)(struct se_cmd *))
3590{
3591 spin_lock_irq(&dev->qf_cmd_lock);
3592 cmd->se_cmd_flags |= SCF_EMULATE_QUEUE_FULL;
3593 cmd->transport_qf_callback = qf_callback;
3594 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3595 atomic_inc(&dev->dev_qf_count);
3596 smp_mb__after_atomic_inc();
3597 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3598
3599 schedule_work(&cmd->se_dev->qf_work_queue);
3600}
3601
c66ac9db
NB		 3602static void transport_generic_complete_ok(struct se_cmd *cmd)
3603{
07bde79a 3604 int reason = 0, ret;
c66ac9db
NB		 3605 /*
3606 * Check if we need to move delayed/dormant tasks from cmds on the
3607 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3608 * Attribute.
3609 */
5951146d 3610 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3611 transport_complete_task_attr(cmd);
07bde79a
NB		 3612 /*
3613 * Check to schedule QUEUE_FULL work, or execute an existing
3614 * cmd->transport_qf_callback()
3615 */
3616 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3617 schedule_work(&cmd->se_dev->qf_work_queue);
3618
3619 if (cmd->transport_qf_callback) {
3620 ret = cmd->transport_qf_callback(cmd);
3621 if (ret < 0)
3622 goto queue_full;
3623
3624 cmd->transport_qf_callback = NULL;
3625 goto done;
3626 }
c66ac9db
NB		 3627 /*
3628 * Check if we need to retrieve a sense buffer from
3629 * the struct se_cmd in question.
3630 */
3631 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3632 if (transport_get_sense_data(cmd) < 0)
3633 reason = TCM_NON_EXISTENT_LUN;
3634
3635 /*
3636 * Only set when an struct se_task->task_scsi_status returned
3637 * a non GOOD status.
3638 */
3639 if (cmd->scsi_status) {
07bde79a 3640 ret = transport_send_check_condition_and_sense(
c66ac9db 3641 cmd, reason, 1);
07bde79a
NB		 3642 if (ret == -EAGAIN)
3643 goto queue_full;
3644
c66ac9db
NB		 3645 transport_lun_remove_cmd(cmd);
3646 transport_cmd_check_stop_to_fabric(cmd);
3647 return;
3648 }
3649 }
3650 /*
25985edc 3651 * Check for a callback, used by amongst other things
c66ac9db
NB		 3652 * XDWRITE_READ_10 emulation.
3653 */
3654 if (cmd->transport_complete_callback)
3655 cmd->transport_complete_callback(cmd);
3656
3657 switch (cmd->data_direction) {
3658 case DMA_FROM_DEVICE:
3659 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3660 if (cmd->se_lun->lun_sep) {
3661 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3662 cmd->data_length;
3663 }
3664 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3665
07bde79a
NB		 3666 ret = cmd->se_tfo->queue_data_in(cmd);
3667 if (ret == -EAGAIN)
3668 goto queue_full;
c66ac9db
NB		 3669 break;
3670 case DMA_TO_DEVICE:
3671 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3672 if (cmd->se_lun->lun_sep) {
3673 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3674 cmd->data_length;
3675 }
3676 spin_unlock(&cmd->se_lun->lun_sep_lock);
3677 /*
3678 * Check if we need to send READ payload for BIDI-COMMAND
3679 */
ec98f782 3680 if (cmd->t_bidi_data_sg) {
c66ac9db 3681 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3682 if (cmd->se_lun->lun_sep) {
3683 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3684 cmd->data_length;
3685 }
3686 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a
NB		 3687 ret = cmd->se_tfo->queue_data_in(cmd);
3688 if (ret == -EAGAIN)
3689 goto queue_full;
c66ac9db
NB		 3690 break;
3691 }
3692 /* Fall through for DMA_TO_DEVICE */
3693 case DMA_NONE:
07bde79a
NB		 3694 ret = cmd->se_tfo->queue_status(cmd);
3695 if (ret == -EAGAIN)
3696 goto queue_full;
c66ac9db
NB		 3697 break;
3698 default:
3699 break;
3700 }
3701
07bde79a 3702done:
c66ac9db
NB		 3703 transport_lun_remove_cmd(cmd);
3704 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3705 return;
3706
3707queue_full:
6708bb27 3708 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a
NB		 3709 " data_direction: %d\n", cmd, cmd->data_direction);
3710 transport_handle_queue_full(cmd, cmd->se_dev, transport_complete_qf);
c66ac9db
NB		 3711}
3712
3713static void transport_free_dev_tasks(struct se_cmd *cmd)
3714{
3715 struct se_task *task, *task_tmp;
3716 unsigned long flags;
3717
a1d8b49a 3718 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3719 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3720 &cmd->t_task_list, t_list) {
c66ac9db
NB		 3721 if (atomic_read(&task->task_active))
3722 continue;
3723
3724 kfree(task->task_sg_bidi);
3725 kfree(task->task_sg);
3726
3727 list_del(&task->t_list);
3728
a1d8b49a 3729 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3730 if (task->se_dev)
e3d6f909 3731 task->se_dev->transport->free_task(task);
c66ac9db 3732 else
6708bb27 3733 pr_err("task[%u] - task->se_dev is NULL\n",
c66ac9db 3734 task->task_no);
a1d8b49a 3735 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3736 }
a1d8b49a 3737 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3738}
3739
6708bb27 3740static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3741{
ec98f782 3742 struct scatterlist *sg;
ec98f782 3743 int count;
c66ac9db 3744
6708bb27
AG		 3745 for_each_sg(sgl, sg, nents, count)
3746 __free_page(sg_page(sg));
c66ac9db 3747
6708bb27
AG		 3748 kfree(sgl);
3749}
c66ac9db 3750
6708bb27
AG		 3751static inline void transport_free_pages(struct se_cmd *cmd)
3752{
3753 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3754 return;
3755
3756 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3757 cmd->t_data_sg = NULL;
3758 cmd->t_data_nents = 0;
c66ac9db 3759
6708bb27 3760 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3761 cmd->t_bidi_data_sg = NULL;
3762 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3763}
3764
3765static inline void transport_release_tasks(struct se_cmd *cmd)
3766{
3767 transport_free_dev_tasks(cmd);
3768}
3769
3770static inline int transport_dec_and_check(struct se_cmd *cmd)
3771{
3772 unsigned long flags;
3773
a1d8b49a
AG		 3774 spin_lock_irqsave(&cmd->t_state_lock, flags);
3775 if (atomic_read(&cmd->t_fe_count)) {
6708bb27 3776 if (!atomic_dec_and_test(&cmd->t_fe_count)) {
a1d8b49a 3777 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 3778 flags);
3779 return 1;
3780 }
3781 }
3782
a1d8b49a 3783 if (atomic_read(&cmd->t_se_count)) {
6708bb27 3784 if (!atomic_dec_and_test(&cmd->t_se_count)) {
a1d8b49a 3785 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 3786 flags);
3787 return 1;
3788 }
3789 }
a1d8b49a 3790 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3791
3792 return 0;
3793}
3794
3795static void transport_release_fe_cmd(struct se_cmd *cmd)
3796{
3797 unsigned long flags;
3798
3799 if (transport_dec_and_check(cmd))
3800 return;
3801
a1d8b49a 3802 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 3803 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 3804 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3805 goto free_pages;
3806 }
a1d8b49a 3807 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 3808 transport_all_task_dev_remove_state(cmd);
a1d8b49a 3809 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3810
3811 transport_release_tasks(cmd);
3812free_pages:
3813 transport_free_pages(cmd);
3814 transport_free_se_cmd(cmd);
35462975 3815 cmd->se_tfo->release_cmd(cmd);
c66ac9db
NB		 3816}
3817
35462975
CH		 3818static int
3819transport_generic_remove(struct se_cmd *cmd, int session_reinstatement)
c66ac9db
NB		 3820{
3821 unsigned long flags;
3822
c66ac9db
NB		 3823 if (transport_dec_and_check(cmd)) {
3824 if (session_reinstatement) {
a1d8b49a 3825 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3826 transport_all_task_dev_remove_state(cmd);
a1d8b49a 3827 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 3828 flags);
3829 }
3830 return 1;
3831 }
3832
a1d8b49a 3833 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 3834 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 3835 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3836 goto free_pages;
3837 }
a1d8b49a 3838 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 3839 transport_all_task_dev_remove_state(cmd);
a1d8b49a 3840 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3841
3842 transport_release_tasks(cmd);
5951146d 3843
c66ac9db
NB		 3844free_pages:
3845 transport_free_pages(cmd);
35462975 3846 transport_release_cmd(cmd);
c66ac9db
NB		 3847 return 0;
3848}
3849
3850/*
ec98f782
AG		 3851 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3852 * allocating in the core.
c66ac9db
NB		 3853 * @cmd: Associated se_cmd descriptor
3854 * @mem: SGL style memory for TCM WRITE / READ
3855 * @sg_mem_num: Number of SGL elements
3856 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3857 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3858 *
3859 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3860 * of parameters.
3861 */
3862int transport_generic_map_mem_to_cmd(
3863 struct se_cmd *cmd,
5951146d
AG		 3864 struct scatterlist *sgl,
3865 u32 sgl_count,
3866 struct scatterlist *sgl_bidi,
3867 u32 sgl_bidi_count)
c66ac9db 3868{
5951146d 3869 if (!sgl || !sgl_count)
c66ac9db 3870 return 0;
c66ac9db 3871
c66ac9db
NB		 3872 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3873 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
c66ac9db 3874
ec98f782
AG		 3875 cmd->t_data_sg = sgl;
3876 cmd->t_data_nents = sgl_count;
c66ac9db 3877
ec98f782
AG		 3878 if (sgl_bidi && sgl_bidi_count) {
3879 cmd->t_bidi_data_sg = sgl_bidi;
3880 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3881 }
3882 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3883 }
3884
3885 return 0;
3886}
3887EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3888
c66ac9db
NB		 3889static int transport_new_cmd_obj(struct se_cmd *cmd)
3890{
5951146d 3891 struct se_device *dev = cmd->se_dev;
01cde4d5 3892 int set_counts = 1, rc, task_cdbs;
c66ac9db 3893
ec98f782
AG		 3894 /*
3895 * Setup any BIDI READ tasks and memory from
3896 * cmd->t_mem_bidi_list so the READ struct se_tasks
3897 * are queued first for the non pSCSI passthrough case.
3898 */
3899 if (cmd->t_bidi_data_sg &&
3900 (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) {
3901 rc = transport_allocate_tasks(cmd,
3902 cmd->t_task_lba,
3903 DMA_FROM_DEVICE,
3904 cmd->t_bidi_data_sg,
3905 cmd->t_bidi_data_nents);
6708bb27 3906 if (rc <= 0) {
c66ac9db
NB		 3907 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3908 cmd->scsi_sense_reason =
ec98f782 3909 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
01cde4d5 3910 return -EINVAL;
c66ac9db 3911 }
ec98f782
AG		 3912 atomic_inc(&cmd->t_fe_count);
3913 atomic_inc(&cmd->t_se_count);
3914 set_counts = 0;
3915 }
3916 /*
3917 * Setup the tasks and memory from cmd->t_mem_list
3918 * Note for BIDI transfers this will contain the WRITE payload
3919 */
3920 task_cdbs = transport_allocate_tasks(cmd,
3921 cmd->t_task_lba,
3922 cmd->data_direction,
3923 cmd->t_data_sg,
3924 cmd->t_data_nents);
6708bb27 3925 if (task_cdbs <= 0) {
ec98f782
AG		 3926 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3927 cmd->scsi_sense_reason =
3928 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
01cde4d5 3929 return -EINVAL;
ec98f782 3930 }
c66ac9db 3931
ec98f782
AG		 3932 if (set_counts) {
3933 atomic_inc(&cmd->t_fe_count);
3934 atomic_inc(&cmd->t_se_count);
c66ac9db
NB		 3935 }
3936
ec98f782
AG		 3937 cmd->t_task_list_num = task_cdbs;
3938
a1d8b49a
AG		 3939 atomic_set(&cmd->t_task_cdbs_left, task_cdbs);
3940 atomic_set(&cmd->t_task_cdbs_ex_left, task_cdbs);
3941 atomic_set(&cmd->t_task_cdbs_timeout_left, task_cdbs);
c66ac9db
NB		 3942 return 0;
3943}
3944
05d1c7c0
AG		 3945void *transport_kmap_first_data_page(struct se_cmd *cmd)
3946{
ec98f782 3947 struct scatterlist *sg = cmd->t_data_sg;
05d1c7c0 3948
ec98f782 3949 BUG_ON(!sg);
05d1c7c0 3950 /*
ec98f782
AG		 3951 * We need to take into account a possible offset here for fabrics like
3952 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3953 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3954 */
ec98f782 3955 return kmap(sg_page(sg)) + sg->offset;
05d1c7c0
AG		 3956}
3957EXPORT_SYMBOL(transport_kmap_first_data_page);
3958
3959void transport_kunmap_first_data_page(struct se_cmd *cmd)
3960{
ec98f782 3961 kunmap(sg_page(cmd->t_data_sg));
05d1c7c0
AG		 3962}
3963EXPORT_SYMBOL(transport_kunmap_first_data_page);
3964
c66ac9db 3965static int
05d1c7c0 3966transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3967{
ec98f782
AG		 3968 u32 length = cmd->data_length;
3969 unsigned int nents;
3970 struct page *page;
3971 int i = 0;
c66ac9db 3972
ec98f782
AG		 3973 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3974 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3975 if (!cmd->t_data_sg)
3976 return -ENOMEM;
c66ac9db 3977
ec98f782
AG		 3978 cmd->t_data_nents = nents;
3979 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3980
ec98f782
AG		 3981 while (length) {
3982 u32 page_len = min_t(u32, length, PAGE_SIZE);
3983 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3984 if (!page)
3985 goto out;
c66ac9db 3986
ec98f782
AG		 3987 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3988 length -= page_len;
3989 i++;
c66ac9db 3990 }
c66ac9db 3991 return 0;
c66ac9db 3992
ec98f782
AG		 3993out:
3994 while (i >= 0) {
3995 __free_page(sg_page(&cmd->t_data_sg[i]));
3996 i--;
c66ac9db 3997 }
ec98f782
AG		 3998 kfree(cmd->t_data_sg);
3999 cmd->t_data_sg = NULL;
4000 return -ENOMEM;
c66ac9db
NB		 4001}
4002
a1d8b49a
AG		 4003/* Reduce sectors if they are too long for the device */
4004static inline sector_t transport_limit_task_sectors(
c66ac9db
NB		 4005 struct se_device *dev,
4006 unsigned long long lba,
a1d8b49a 4007 sector_t sectors)
c66ac9db 4008{
a1d8b49a 4009 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db 4010
a1d8b49a
AG		 4011 if (dev->transport->get_device_type(dev) == TYPE_DISK)
4012 if ((lba + sectors) > transport_dev_end_lba(dev))
4013 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
c66ac9db 4014
a1d8b49a 4015 return sectors;
c66ac9db
NB		 4016}
4017
c66ac9db
NB		 4018
4019/*
4020 * This function can be used by HW target mode drivers to create a linked
4021 * scatterlist from all contiguously allocated struct se_task->task_sg[].
4022 * This is intended to be called during the completion path by TCM Core
4023 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
4024 */
4025void transport_do_task_sg_chain(struct se_cmd *cmd)
4026{
ec98f782
AG		 4027 struct scatterlist *sg_first = NULL;
4028 struct scatterlist *sg_prev = NULL;
4029 int sg_prev_nents = 0;
4030 struct scatterlist *sg;
c66ac9db 4031 struct se_task *task;
ec98f782 4032 u32 chained_nents = 0;
c66ac9db
NB		 4033 int i;
4034
ec98f782
AG		 4035 BUG_ON(!cmd->se_tfo->task_sg_chaining);
4036
c66ac9db
NB		 4037 /*
4038 * Walk the struct se_task list and setup scatterlist chains
a1d8b49a 4039 * for each contiguously allocated struct se_task->task_sg[].
c66ac9db 4040 */
a1d8b49a 4041 list_for_each_entry(task, &cmd->t_task_list, t_list) {
ec98f782 4042 if (!task->task_sg)
c66ac9db
NB		 4043 continue;
4044
ec98f782
AG		 4045 if (!sg_first) {
4046 sg_first = task->task_sg;
6708bb27 4047 chained_nents = task->task_sg_nents;
97868c89 4048 } else {
ec98f782 4049 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
6708bb27 4050 chained_nents += task->task_sg_nents;
97868c89 4051 }
c3c74c7a
NB		 4052 /*
4053 * For the padded tasks, use the extra SGL vector allocated
4054 * in transport_allocate_data_tasks() for the sg_prev_nents
4055 * offset into sg_chain() above.. The last task of a
4056 * multi-task list, or a single task will not have
4057 * task->task_sg_padded set..
4058 */
4059 if (task->task_padded_sg)
4060 sg_prev_nents = (task->task_sg_nents + 1);
4061 else
4062 sg_prev_nents = task->task_sg_nents;
ec98f782
AG		 4063
4064 sg_prev = task->task_sg;
c66ac9db
NB		 4065 }
4066 /*
4067 * Setup the starting pointer and total t_tasks_sg_linked_no including
4068 * padding SGs for linking and to mark the end.
4069 */
a1d8b49a 4070 cmd->t_tasks_sg_chained = sg_first;
ec98f782 4071 cmd->t_tasks_sg_chained_no = chained_nents;
c66ac9db 4072
6708bb27 4073 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
a1d8b49a
AG		 4074 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
4075 cmd->t_tasks_sg_chained_no);
c66ac9db 4076
a1d8b49a
AG		 4077 for_each_sg(cmd->t_tasks_sg_chained, sg,
4078 cmd->t_tasks_sg_chained_no, i) {
c66ac9db 4079
6708bb27 4080 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
5951146d 4081 i, sg, sg_page(sg), sg->length, sg->offset);
c66ac9db 4082 if (sg_is_chain(sg))
6708bb27 4083 pr_debug("SG: %p sg_is_chain=1\n", sg);
c66ac9db 4084 if (sg_is_last(sg))
6708bb27 4085 pr_debug("SG: %p sg_is_last=1\n", sg);
c66ac9db 4086 }
c66ac9db
NB		 4087}
4088EXPORT_SYMBOL(transport_do_task_sg_chain);
4089
a1d8b49a
AG		 4090/*
4091 * Break up cmd into chunks transport can handle
4092 */
ec98f782 4093static int transport_allocate_data_tasks(
c66ac9db
NB		 4094 struct se_cmd *cmd,
4095 unsigned long long lba,
c66ac9db 4096 enum dma_data_direction data_direction,
ec98f782
AG		 4097 struct scatterlist *sgl,
4098 unsigned int sgl_nents)
c66ac9db
NB		 4099{
4100 unsigned char *cdb = NULL;
4101 struct se_task *task;
5951146d 4102 struct se_device *dev = cmd->se_dev;
ec98f782 4103 unsigned long flags;
1d20bb61 4104 int task_count, i, ret;
277c5f27 4105 sector_t sectors, dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
ec98f782
AG		 4106 u32 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
4107 struct scatterlist *sg;
4108 struct scatterlist *cmd_sg;
a1d8b49a 4109
ec98f782
AG		 4110 WARN_ON(cmd->data_length % sector_size);
4111 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
277c5f27
NB		 4112 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
4113
ec98f782
AG		 4114 cmd_sg = sgl;
4115 for (i = 0; i < task_count; i++) {
c3c74c7a 4116 unsigned int task_size, task_sg_nents_padded;
ec98f782 4117 int count;
a1d8b49a 4118
c66ac9db 4119 task = transport_generic_get_task(cmd, data_direction);
a1d8b49a 4120 if (!task)
ec98f782 4121 return -ENOMEM;
c66ac9db 4122
c66ac9db 4123 task->task_lba = lba;
ec98f782
AG		 4124 task->task_sectors = min(sectors, dev_max_sectors);
4125 task->task_size = task->task_sectors * sector_size;
c66ac9db 4126
e3d6f909 4127 cdb = dev->transport->get_cdb(task);
a1d8b49a
AG		 4128 BUG_ON(!cdb);
4129
4130 memcpy(cdb, cmd->t_task_cdb,
4131 scsi_command_size(cmd->t_task_cdb));
4132
4133 /* Update new cdb with updated lba/sectors */
3a867205 4134 cmd->transport_split_cdb(task->task_lba, task->task_sectors, cdb);
525a48a2
NB		 4135 /*
4136 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
4137 * in order to calculate the number per task SGL entries
4138 */
4139 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
c66ac9db 4140 /*
ec98f782
AG		 4141 * Check if the fabric module driver is requesting that all
4142 * struct se_task->task_sg[] be chained together.. If so,
4143 * then allocate an extra padding SG entry for linking and
c3c74c7a
NB		 4144 * marking the end of the chained SGL for every task except
4145 * the last one for (task_count > 1) operation, or skipping
4146 * the extra padding for the (task_count == 1) case.
c66ac9db 4147 */
c3c74c7a
NB		 4148 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
4149 task_sg_nents_padded = (task->task_sg_nents + 1);
ec98f782 4150 task->task_padded_sg = 1;
c3c74c7a
NB		 4151 } else
4152 task_sg_nents_padded = task->task_sg_nents;
c66ac9db 4153
1d20bb61 4154 task->task_sg = kmalloc(sizeof(struct scatterlist) *
c3c74c7a 4155 task_sg_nents_padded, GFP_KERNEL);
ec98f782
AG		 4156 if (!task->task_sg) {
4157 cmd->se_dev->transport->free_task(task);
4158 return -ENOMEM;
4159 }
4160
c3c74c7a 4161 sg_init_table(task->task_sg, task_sg_nents_padded);
c66ac9db 4162
ec98f782
AG		 4163 task_size = task->task_size;
4164
4165 /* Build new sgl, only up to task_size */
6708bb27 4166 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
ec98f782
AG		 4167 if (cmd_sg->length > task_size)
4168 break;
4169
4170 *sg = *cmd_sg;
4171 task_size -= cmd_sg->length;
4172 cmd_sg = sg_next(cmd_sg);
c66ac9db 4173 }
c66ac9db 4174
ec98f782
AG		 4175 lba += task->task_sectors;
4176 sectors -= task->task_sectors;
c66ac9db 4177
ec98f782
AG		 4178 spin_lock_irqsave(&cmd->t_state_lock, flags);
4179 list_add_tail(&task->t_list, &cmd->t_task_list);
4180 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4181 }
1d20bb61
NB		 4182 /*
4183 * Now perform the memory map of task->task_sg[] into backend
4184 * subsystem memory..
4185 */
4186 list_for_each_entry(task, &cmd->t_task_list, t_list) {
4187 if (atomic_read(&task->task_sent))
4188 continue;
4189 if (!dev->transport->map_data_SG)
4190 continue;
4191
4192 ret = dev->transport->map_data_SG(task);
4193 if (ret < 0)
4194 return 0;
4195 }
c66ac9db 4196
ec98f782 4197 return task_count;
c66ac9db
NB		 4198}
4199
4200static int
ec98f782 4201transport_allocate_control_task(struct se_cmd *cmd)
c66ac9db 4202{
5951146d 4203 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4204 unsigned char *cdb;
4205 struct se_task *task;
ec98f782 4206 unsigned long flags;
6708bb27 4207 int ret = 0;
c66ac9db
NB		 4208
4209 task = transport_generic_get_task(cmd, cmd->data_direction);
4210 if (!task)
ec98f782 4211 return -ENOMEM;
c66ac9db 4212
e3d6f909 4213 cdb = dev->transport->get_cdb(task);
a1d8b49a
AG		 4214 BUG_ON(!cdb);
4215 memcpy(cdb, cmd->t_task_cdb,
4216 scsi_command_size(cmd->t_task_cdb));
c66ac9db 4217
ec98f782
AG		 4218 task->task_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
4219 GFP_KERNEL);
4220 if (!task->task_sg) {
4221 cmd->se_dev->transport->free_task(task);
4222 return -ENOMEM;
4223 }
4224
4225 memcpy(task->task_sg, cmd->t_data_sg,
4226 sizeof(struct scatterlist) * cmd->t_data_nents);
c66ac9db 4227 task->task_size = cmd->data_length;
6708bb27 4228 task->task_sg_nents = cmd->t_data_nents;
c66ac9db 4229
ec98f782
AG		 4230 spin_lock_irqsave(&cmd->t_state_lock, flags);
4231 list_add_tail(&task->t_list, &cmd->t_task_list);
4232 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4233
4234 if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) {
1d20bb61
NB		 4235 if (dev->transport->map_control_SG)
4236 ret = dev->transport->map_control_SG(task);
c66ac9db
NB		 4237 } else if (cmd->se_cmd_flags & SCF_SCSI_NON_DATA_CDB) {
4238 if (dev->transport->cdb_none)
6708bb27 4239 ret = dev->transport->cdb_none(task);
c66ac9db 4240 } else {
6708bb27 4241 pr_err("target: Unknown control cmd type!\n");
c66ac9db 4242 BUG();
ec98f782 4243 }
6708bb27
AG		 4244
4245 /* Success! Return number of tasks allocated */
4246 if (ret == 0)
4247 return 1;
4248 return ret;
ec98f782
AG		 4249}
4250
4251static u32 transport_allocate_tasks(
4252 struct se_cmd *cmd,
4253 unsigned long long lba,
4254 enum dma_data_direction data_direction,
4255 struct scatterlist *sgl,
4256 unsigned int sgl_nents)
4257{
01cde4d5
NB		 4258 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
4259 if (transport_cmd_get_valid_sectors(cmd) < 0)
4260 return -EINVAL;
4261
ec98f782
AG		 4262 return transport_allocate_data_tasks(cmd, lba, data_direction,
4263 sgl, sgl_nents);
01cde4d5 4264 } else
6708bb27
AG		 4265 return transport_allocate_control_task(cmd);
4266
c66ac9db
NB		 4267}
4268
ec98f782 4269
c66ac9db
NB		 4270/* transport_generic_new_cmd(): Called from transport_processing_thread()
4271 *
4272 * Allocate storage transport resources from a set of values predefined
4273 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4274 * Any non zero return here is treated as an "out of resource' op here.
4275 */
4276 /*
4277 * Generate struct se_task(s) and/or their payloads for this CDB.
4278 */
a1d8b49a 4279int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 4280{
c66ac9db
NB		 4281 int ret = 0;
4282
4283 /*
4284 * Determine is the TCM fabric module has already allocated physical
4285 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 4286 * beforehand.
c66ac9db 4287 */
ec98f782
AG		 4288 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
4289 cmd->data_length) {
05d1c7c0 4290 ret = transport_generic_get_mem(cmd);
c66ac9db
NB		 4291 if (ret < 0)
4292 return ret;
4293 }
1d20bb61
NB		 4294 /*
4295 * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4296 * control or data CDB types, and perform the map to backend subsystem
4297 * code from SGL memory allocated here by transport_generic_get_mem(), or
4298 * via pre-existing SGL memory setup explictly by fabric module code with
4299 * transport_generic_map_mem_to_cmd().
4300 */
c66ac9db
NB		 4301 ret = transport_new_cmd_obj(cmd);
4302 if (ret < 0)
4303 return ret;
c66ac9db 4304 /*
a1d8b49a 4305 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 4306 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4307 * will be added to the struct se_device execution queue after its WRITE
4308 * data has arrived. (ie: It gets handled by the transport processing
4309 * thread a second time)
4310 */
4311 if (cmd->data_direction == DMA_TO_DEVICE) {
4312 transport_add_tasks_to_state_queue(cmd);
4313 return transport_generic_write_pending(cmd);
4314 }
4315 /*
4316 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4317 * to the execution queue.
4318 */
4319 transport_execute_tasks(cmd);
4320 return 0;
4321}
a1d8b49a 4322EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 4323
4324/* transport_generic_process_write():
4325 *
4326 *
4327 */
4328void transport_generic_process_write(struct se_cmd *cmd)
4329{
c66ac9db
NB		 4330 transport_execute_tasks(cmd);
4331}
4332EXPORT_SYMBOL(transport_generic_process_write);
4333
07bde79a
NB		 4334static int transport_write_pending_qf(struct se_cmd *cmd)
4335{
4336 return cmd->se_tfo->write_pending(cmd);
4337}
4338
c66ac9db
NB		 4339/* transport_generic_write_pending():
4340 *
4341 *
4342 */
4343static int transport_generic_write_pending(struct se_cmd *cmd)
4344{
4345 unsigned long flags;
4346 int ret;
4347
a1d8b49a 4348 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4349 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 4350 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a
NB		 4351
4352 if (cmd->transport_qf_callback) {
4353 ret = cmd->transport_qf_callback(cmd);
4354 if (ret == -EAGAIN)
4355 goto queue_full;
4356 else if (ret < 0)
4357 return ret;
4358
4359 cmd->transport_qf_callback = NULL;
4360 return 0;
4361 }
05d1c7c0 4362
c66ac9db
NB		 4363 /*
4364 * Clear the se_cmd for WRITE_PENDING status in order to set
a1d8b49a 4365 * cmd->t_transport_active=0 so that transport_generic_handle_data
c66ac9db 4366 * can be called from HW target mode interrupt code. This is safe
e3d6f909 4367 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 4368 * because the se_cmd->se_lun pointer is not being cleared.
4369 */
4370 transport_cmd_check_stop(cmd, 1, 0);
4371
4372 /*
4373 * Call the fabric write_pending function here to let the
4374 * frontend know that WRITE buffers are ready.
4375 */
e3d6f909 4376 ret = cmd->se_tfo->write_pending(cmd);
07bde79a
NB		 4377 if (ret == -EAGAIN)
4378 goto queue_full;
4379 else if (ret < 0)
c66ac9db
NB		 4380 return ret;
4381
4382 return PYX_TRANSPORT_WRITE_PENDING;
07bde79a
NB		 4383
4384queue_full:
6708bb27 4385 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a
NB		 4386 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
4387 transport_handle_queue_full(cmd, cmd->se_dev,
4388 transport_write_pending_qf);
4389 return ret;
c66ac9db
NB		 4390}
4391
35462975 4392void transport_release_cmd(struct se_cmd *cmd)
c66ac9db 4393{
e3d6f909 4394 BUG_ON(!cmd->se_tfo);
c66ac9db
NB		 4395
4396 transport_free_se_cmd(cmd);
35462975 4397 cmd->se_tfo->release_cmd(cmd);
c66ac9db 4398}
35462975 4399EXPORT_SYMBOL(transport_release_cmd);
c66ac9db
NB		 4400
4401/* transport_generic_free_cmd():
4402 *
4403 * Called from processing frontend to release storage engine resources
4404 */
4405void transport_generic_free_cmd(
4406 struct se_cmd *cmd,
4407 int wait_for_tasks,
c66ac9db
NB		 4408 int session_reinstatement)
4409{
5951146d 4410 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD))
35462975 4411 transport_release_cmd(cmd);
c66ac9db
NB		 4412 else {
4413 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
4414
e3d6f909 4415 if (cmd->se_lun) {
c66ac9db 4416#if 0
6708bb27 4417 pr_debug("cmd: %p ITT: 0x%08x contains"
e3d6f909
AG		 4418 " cmd->se_lun\n", cmd,
4419 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4420#endif
4421 transport_lun_remove_cmd(cmd);
4422 }
4423
4424 if (wait_for_tasks && cmd->transport_wait_for_tasks)
4425 cmd->transport_wait_for_tasks(cmd, 0, 0);
4426
f4366772
NB		 4427 transport_free_dev_tasks(cmd);
4428
35462975 4429 transport_generic_remove(cmd, session_reinstatement);
c66ac9db
NB		 4430 }
4431}
4432EXPORT_SYMBOL(transport_generic_free_cmd);
4433
4434static void transport_nop_wait_for_tasks(
4435 struct se_cmd *cmd,
4436 int remove_cmd,
4437 int session_reinstatement)
4438{
4439 return;
4440}
4441
4442/* transport_lun_wait_for_tasks():
4443 *
4444 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4445 * an struct se_lun to be successfully shutdown.
4446 */
4447static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4448{
4449 unsigned long flags;
4450 int ret;
4451 /*
4452 * If the frontend has already requested this struct se_cmd to
4453 * be stopped, we can safely ignore this struct se_cmd.
4454 */
a1d8b49a
AG		 4455 spin_lock_irqsave(&cmd->t_state_lock, flags);
4456 if (atomic_read(&cmd->t_transport_stop)) {
4457 atomic_set(&cmd->transport_lun_stop, 0);
6708bb27 4458 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
e3d6f909 4459 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4460 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4461 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 4462 return -EPERM;
c66ac9db 4463 }
a1d8b49a
AG		 4464 atomic_set(&cmd->transport_lun_fe_stop, 1);
4465 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4466
5951146d 4467 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 4468
4469 ret = transport_stop_tasks_for_cmd(cmd);
4470
6708bb27
AG		 4471 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4472 " %d\n", cmd, cmd->t_task_list_num, ret);
c66ac9db 4473 if (!ret) {
6708bb27 4474 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 4475 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4476 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 4477 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 4478 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4479 }
5951146d 4480 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 4481
4482 return 0;
4483}
4484
c66ac9db
NB		 4485static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4486{
4487 struct se_cmd *cmd = NULL;
4488 unsigned long lun_flags, cmd_flags;
4489 /*
4490 * Do exception processing and return CHECK_CONDITION status to the
4491 * Initiator Port.
4492 */
4493 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 4494 while (!list_empty(&lun->lun_cmd_list)) {
4495 cmd = list_first_entry(&lun->lun_cmd_list,
4496 struct se_cmd, se_lun_node);
4497 list_del(&cmd->se_lun_node);
4498
a1d8b49a 4499 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db
NB		 4500 /*
4501 * This will notify iscsi_target_transport.c:
4502 * transport_cmd_check_stop() that a LUN shutdown is in
4503 * progress for the iscsi_cmd_t.
4504 */
a1d8b49a 4505 spin_lock(&cmd->t_state_lock);
6708bb27 4506 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 4507 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 4508 cmd->se_lun->unpacked_lun,
4509 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a
AG		 4510 atomic_set(&cmd->transport_lun_stop, 1);
4511 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 4512
4513 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4514
6708bb27
AG		 4515 if (!cmd->se_lun) {
4516 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 4517 cmd->se_tfo->get_task_tag(cmd),
4518 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 4519 BUG();
4520 }
4521 /*
4522 * If the Storage engine still owns the iscsi_cmd_t, determine
4523 * and/or stop its context.
4524 */
6708bb27 4525 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 4526 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4527 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4528
e3d6f909 4529 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 4530 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4531 continue;
4532 }
4533
6708bb27 4534 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 4535 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 4536 cmd->se_lun->unpacked_lun,
4537 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4538
a1d8b49a 4539 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
6708bb27 4540 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 4541 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4542 goto check_cond;
4543 }
a1d8b49a 4544 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 4545 transport_all_task_dev_remove_state(cmd);
a1d8b49a 4546 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4547
4548 transport_free_dev_tasks(cmd);
4549 /*
4550 * The Storage engine stopped this struct se_cmd before it was
4551 * send to the fabric frontend for delivery back to the
4552 * Initiator Node. Return this SCSI CDB back with an
4553 * CHECK_CONDITION status.
4554 */
4555check_cond:
4556 transport_send_check_condition_and_sense(cmd,
4557 TCM_NON_EXISTENT_LUN, 0);
4558 /*
4559 * If the fabric frontend is waiting for this iscsi_cmd_t to
4560 * be released, notify the waiting thread now that LU has
4561 * finished accessing it.
4562 */
a1d8b49a
AG		 4563 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4564 if (atomic_read(&cmd->transport_lun_fe_stop)) {
6708bb27 4565 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 4566 " struct se_cmd: %p ITT: 0x%08x\n",
4567 lun->unpacked_lun,
e3d6f909 4568 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4569
a1d8b49a 4570 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 4571 cmd_flags);
4572 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 4573 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 4574 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4575 continue;
4576 }
6708bb27 4577 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 4578 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4579
a1d8b49a 4580 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4581 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4582 }
4583 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4584}
4585
4586static int transport_clear_lun_thread(void *p)
4587{
4588 struct se_lun *lun = (struct se_lun *)p;
4589
4590 __transport_clear_lun_from_sessions(lun);
4591 complete(&lun->lun_shutdown_comp);
4592
4593 return 0;
4594}
4595
4596int transport_clear_lun_from_sessions(struct se_lun *lun)
4597{
4598 struct task_struct *kt;
4599
5951146d 4600 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 4601 "tcm_cl_%u", lun->unpacked_lun);
4602 if (IS_ERR(kt)) {
6708bb27 4603 pr_err("Unable to start clear_lun thread\n");
e3d6f909 4604 return PTR_ERR(kt);
c66ac9db
NB		 4605 }
4606 wait_for_completion(&lun->lun_shutdown_comp);
4607
4608 return 0;
4609}
4610
4611/* transport_generic_wait_for_tasks():
4612 *
4613 * Called from frontend or passthrough context to wait for storage engine
4614 * to pause and/or release frontend generated struct se_cmd.
4615 */
4616static void transport_generic_wait_for_tasks(
4617 struct se_cmd *cmd,
4618 int remove_cmd,
4619 int session_reinstatement)
4620{
4621 unsigned long flags;
4622
4623 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req))
4624 return;
4625
a1d8b49a 4626 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4627 /*
4628 * If we are already stopped due to an external event (ie: LUN shutdown)
4629 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 4630 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 4631 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4632 * has completed its operation on the struct se_cmd.
4633 */
a1d8b49a 4634 if (atomic_read(&cmd->transport_lun_stop)) {
c66ac9db 4635
6708bb27 4636 pr_debug("wait_for_tasks: Stopping"
e3d6f909 4637 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 4638 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 4639 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4640 /*
4641 * There is a special case for WRITES where a FE exception +
4642 * LUN shutdown means ConfigFS context is still sleeping on
4643 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4644 * We go ahead and up transport_lun_stop_comp just to be sure
4645 * here.
4646 */
a1d8b49a
AG		 4647 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4648 complete(&cmd->transport_lun_stop_comp);
4649 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4650 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4651
4652 transport_all_task_dev_remove_state(cmd);
4653 /*
4654 * At this point, the frontend who was the originator of this
4655 * struct se_cmd, now owns the structure and can be released through
4656 * normal means below.
4657 */
6708bb27 4658 pr_debug("wait_for_tasks: Stopped"
e3d6f909 4659 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 4660 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 4661 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4662
a1d8b49a 4663 atomic_set(&cmd->transport_lun_stop, 0);
c66ac9db 4664 }
a1d8b49a
AG		 4665 if (!atomic_read(&cmd->t_transport_active) ||
4666 atomic_read(&cmd->t_transport_aborted))
c66ac9db
NB		 4667 goto remove;
4668
a1d8b49a 4669 atomic_set(&cmd->t_transport_stop, 1);
c66ac9db 4670
6708bb27 4671 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
c66ac9db 4672 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
e3d6f909
AG		 4673 " = TRUE\n", cmd, cmd->se_tfo->get_task_tag(cmd),
4674 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
c66ac9db
NB		 4675 cmd->deferred_t_state);
4676
a1d8b49a 4677 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4678
5951146d 4679 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 4680
a1d8b49a 4681 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 4682
a1d8b49a
AG		 4683 spin_lock_irqsave(&cmd->t_state_lock, flags);
4684 atomic_set(&cmd->t_transport_active, 0);
4685 atomic_set(&cmd->t_transport_stop, 0);
c66ac9db 4686
6708bb27 4687 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4688 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4689 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4690remove:
a1d8b49a 4691 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4692 if (!remove_cmd)
4693 return;
4694
35462975 4695 transport_generic_free_cmd(cmd, 0, session_reinstatement);
c66ac9db
NB		 4696}
4697
4698static int transport_get_sense_codes(
4699 struct se_cmd *cmd,
4700 u8 *asc,
4701 u8 *ascq)
4702{
4703 *asc = cmd->scsi_asc;
4704 *ascq = cmd->scsi_ascq;
4705
4706 return 0;
4707}
4708
4709static int transport_set_sense_codes(
4710 struct se_cmd *cmd,
4711 u8 asc,
4712 u8 ascq)
4713{
4714 cmd->scsi_asc = asc;
4715 cmd->scsi_ascq = ascq;
4716
4717 return 0;
4718}
4719
4720int transport_send_check_condition_and_sense(
4721 struct se_cmd *cmd,
4722 u8 reason,
4723 int from_transport)
4724{
4725 unsigned char *buffer = cmd->sense_buffer;
4726 unsigned long flags;
4727 int offset;
4728 u8 asc = 0, ascq = 0;
4729
a1d8b49a 4730 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4731 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4732 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4733 return 0;
4734 }
4735 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4736 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4737
4738 if (!reason && from_transport)
4739 goto after_reason;
4740
4741 if (!from_transport)
4742 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4743 /*
4744 * Data Segment and SenseLength of the fabric response PDU.
4745 *
4746 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4747 * from include/scsi/scsi_cmnd.h
4748 */
e3d6f909 4749 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4750 TRANSPORT_SENSE_BUFFER);
4751 /*
4752 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4753 * SENSE KEY values from include/scsi/scsi.h
4754 */
4755 switch (reason) {
4756 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4757 /* CURRENT ERROR */
4758 buffer[offset] = 0x70;
4759 /* ILLEGAL REQUEST */
4760 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4761 /* LOGICAL UNIT NOT SUPPORTED */
4762 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4763 break;
c66ac9db
NB		 4764 case TCM_UNSUPPORTED_SCSI_OPCODE:
4765 case TCM_SECTOR_COUNT_TOO_MANY:
4766 /* CURRENT ERROR */
4767 buffer[offset] = 0x70;
4768 /* ILLEGAL REQUEST */
4769 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4770 /* INVALID COMMAND OPERATION CODE */
4771 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4772 break;
4773 case TCM_UNKNOWN_MODE_PAGE:
4774 /* CURRENT ERROR */
4775 buffer[offset] = 0x70;
4776 /* ILLEGAL REQUEST */
4777 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4778 /* INVALID FIELD IN CDB */
4779 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4780 break;
4781 case TCM_CHECK_CONDITION_ABORT_CMD:
4782 /* CURRENT ERROR */
4783 buffer[offset] = 0x70;
4784 /* ABORTED COMMAND */
4785 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4786 /* BUS DEVICE RESET FUNCTION OCCURRED */
4787 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4788 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4789 break;
4790 case TCM_INCORRECT_AMOUNT_OF_DATA:
4791 /* CURRENT ERROR */
4792 buffer[offset] = 0x70;
4793 /* ABORTED COMMAND */
4794 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4795 /* WRITE ERROR */
4796 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4797 /* NOT ENOUGH UNSOLICITED DATA */
4798 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4799 break;
4800 case TCM_INVALID_CDB_FIELD:
4801 /* CURRENT ERROR */
4802 buffer[offset] = 0x70;
4803 /* ABORTED COMMAND */
4804 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4805 /* INVALID FIELD IN CDB */
4806 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4807 break;
4808 case TCM_INVALID_PARAMETER_LIST:
4809 /* CURRENT ERROR */
4810 buffer[offset] = 0x70;
4811 /* ABORTED COMMAND */
4812 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4813 /* INVALID FIELD IN PARAMETER LIST */
4814 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4815 break;
4816 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4817 /* CURRENT ERROR */
4818 buffer[offset] = 0x70;
4819 /* ABORTED COMMAND */
4820 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4821 /* WRITE ERROR */
4822 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4823 /* UNEXPECTED_UNSOLICITED_DATA */
4824 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4825 break;
4826 case TCM_SERVICE_CRC_ERROR:
4827 /* CURRENT ERROR */
4828 buffer[offset] = 0x70;
4829 /* ABORTED COMMAND */
4830 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4831 /* PROTOCOL SERVICE CRC ERROR */
4832 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4833 /* N/A */
4834 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4835 break;
4836 case TCM_SNACK_REJECTED:
4837 /* CURRENT ERROR */
4838 buffer[offset] = 0x70;
4839 /* ABORTED COMMAND */
4840 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4841 /* READ ERROR */
4842 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4843 /* FAILED RETRANSMISSION REQUEST */
4844 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4845 break;
4846 case TCM_WRITE_PROTECTED:
4847 /* CURRENT ERROR */
4848 buffer[offset] = 0x70;
4849 /* DATA PROTECT */
4850 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4851 /* WRITE PROTECTED */
4852 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4853 break;
4854 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4855 /* CURRENT ERROR */
4856 buffer[offset] = 0x70;
4857 /* UNIT ATTENTION */
4858 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4859 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4860 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4861 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4862 break;
4863 case TCM_CHECK_CONDITION_NOT_READY:
4864 /* CURRENT ERROR */
4865 buffer[offset] = 0x70;
4866 /* Not Ready */
4867 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4868 transport_get_sense_codes(cmd, &asc, &ascq);
4869 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4870 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4871 break;
4872 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4873 default:
4874 /* CURRENT ERROR */
4875 buffer[offset] = 0x70;
4876 /* ILLEGAL REQUEST */
4877 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4878 /* LOGICAL UNIT COMMUNICATION FAILURE */
4879 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4880 break;
4881 }
4882 /*
4883 * This code uses linux/include/scsi/scsi.h SAM status codes!
4884 */
4885 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4886 /*
4887 * Automatically padded, this value is encoded in the fabric's
4888 * data_length response PDU containing the SCSI defined sense data.
4889 */
4890 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4891
4892after_reason:
07bde79a 4893 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4894}
4895EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4896
4897int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4898{
4899 int ret = 0;
4900
a1d8b49a 4901 if (atomic_read(&cmd->t_transport_aborted) != 0) {
6708bb27 4902 if (!send_status ||
c66ac9db
NB		 4903 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4904 return 1;
4905#if 0
6708bb27 4906 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4907 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4908 cmd->t_task_cdb[0],
e3d6f909 4909 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4910#endif
4911 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4912 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4913 ret = 1;
4914 }
4915 return ret;
4916}
4917EXPORT_SYMBOL(transport_check_aborted_status);
4918
4919void transport_send_task_abort(struct se_cmd *cmd)
4920{
4921 /*
4922 * If there are still expected incoming fabric WRITEs, we wait
4923 * until until they have completed before sending a TASK_ABORTED
4924 * response. This response with TASK_ABORTED status will be
4925 * queued back to fabric module by transport_check_aborted_status().
4926 */
4927 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4928 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
a1d8b49a 4929 atomic_inc(&cmd->t_transport_aborted);
c66ac9db
NB		 4930 smp_mb__after_atomic_inc();
4931 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4932 transport_new_cmd_failure(cmd);
4933 return;
4934 }
4935 }
4936 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4937#if 0
6708bb27 4938 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4939 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4940 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4941#endif
e3d6f909 4942 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4943}
4944
4945/* transport_generic_do_tmr():
4946 *
4947 *
4948 */
4949int transport_generic_do_tmr(struct se_cmd *cmd)
4950{
5951146d 4951 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4952 struct se_tmr_req *tmr = cmd->se_tmr_req;
4953 int ret;
4954
4955 switch (tmr->function) {
5c6cd613 4956 case TMR_ABORT_TASK:
c66ac9db
NB		 4957 tmr->response = TMR_FUNCTION_REJECTED;
4958 break;
5c6cd613
NB		 4959 case TMR_ABORT_TASK_SET:
4960 case TMR_CLEAR_ACA:
4961 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4962 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4963 break;
5c6cd613 4964 case TMR_LUN_RESET:
c66ac9db
NB		 4965 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4966 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4967 TMR_FUNCTION_REJECTED;
4968 break;
5c6cd613 4969 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4970 tmr->response = TMR_FUNCTION_REJECTED;
4971 break;
5c6cd613 4972 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4973 tmr->response = TMR_FUNCTION_REJECTED;
4974 break;
c66ac9db 4975 default:
6708bb27 4976 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4977 tmr->function);
4978 tmr->response = TMR_FUNCTION_REJECTED;
4979 break;
4980 }
4981
4982 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4983 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db
NB		 4984
4985 transport_cmd_check_stop(cmd, 2, 0);
4986 return 0;
4987}
4988
4989/*
4990 * Called with spin_lock_irq(&dev->execute_task_lock); held
4991 *
4992 */
4993static struct se_task *
4994transport_get_task_from_state_list(struct se_device *dev)
4995{
4996 struct se_task *task;
4997
4998 if (list_empty(&dev->state_task_list))
4999 return NULL;
5000
5001 list_for_each_entry(task, &dev->state_task_list, t_state_list)
5002 break;
5003
5004 list_del(&task->t_state_list);
5005 atomic_set(&task->task_state_active, 0);
5006
5007 return task;
5008}
5009
5010static void transport_processing_shutdown(struct se_device *dev)
5011{
5012 struct se_cmd *cmd;
c66ac9db 5013 struct se_task *task;
c66ac9db
NB		 5014 unsigned long flags;
5015 /*
5016 * Empty the struct se_device's struct se_task state list.
5017 */
5018 spin_lock_irqsave(&dev->execute_task_lock, flags);
5019 while ((task = transport_get_task_from_state_list(dev))) {
e3d6f909 5020 if (!task->task_se_cmd) {
6708bb27 5021 pr_err("task->task_se_cmd is NULL!\n");
c66ac9db
NB		 5022 continue;
5023 }
e3d6f909 5024 cmd = task->task_se_cmd;
c66ac9db 5025
c66ac9db
NB		 5026 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
5027
a1d8b49a 5028 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 5029
6708bb27
AG		 5030 pr_debug("PT: cmd: %p task: %p ITT: 0x%08x,"
5031 " i_state: %d, t_state/def_t_state:"
c66ac9db 5032 " %d/%d cdb: 0x%02x\n", cmd, task,
6708bb27
AG		 5033 cmd->se_tfo->get_task_tag(cmd),
5034 cmd->se_tfo->get_cmd_state(cmd),
c66ac9db 5035 cmd->t_state, cmd->deferred_t_state,
a1d8b49a 5036 cmd->t_task_cdb[0]);
6708bb27 5037 pr_debug("PT: ITT[0x%08x] - t_tasks: %d t_task_cdbs_left:"
c66ac9db
NB		 5038 " %d t_task_cdbs_sent: %d -- t_transport_active: %d"
5039 " t_transport_stop: %d t_transport_sent: %d\n",
e3d6f909 5040 cmd->se_tfo->get_task_tag(cmd),
6708bb27 5041 cmd->t_task_list_num,
a1d8b49a
AG		 5042 atomic_read(&cmd->t_task_cdbs_left),
5043 atomic_read(&cmd->t_task_cdbs_sent),
5044 atomic_read(&cmd->t_transport_active),
5045 atomic_read(&cmd->t_transport_stop),
5046 atomic_read(&cmd->t_transport_sent));
c66ac9db
NB		 5047
5048 if (atomic_read(&task->task_active)) {
5049 atomic_set(&task->task_stop, 1);
5050 spin_unlock_irqrestore(
a1d8b49a 5051 &cmd->t_state_lock, flags);
c66ac9db 5052
6708bb27 5053 pr_debug("Waiting for task: %p to shutdown for dev:"
c66ac9db
NB		 5054 " %p\n", task, dev);
5055 wait_for_completion(&task->task_stop_comp);
6708bb27 5056 pr_debug("Completed task: %p shutdown for dev: %p\n",
c66ac9db
NB		 5057 task, dev);
5058
a1d8b49a
AG		 5059 spin_lock_irqsave(&cmd->t_state_lock, flags);
5060 atomic_dec(&cmd->t_task_cdbs_left);
c66ac9db
NB		 5061
5062 atomic_set(&task->task_active, 0);
5063 atomic_set(&task->task_stop, 0);
52208ae3
NB		 5064 } else {
5065 if (atomic_read(&task->task_execute_queue) != 0)
5066 transport_remove_task_from_execute_queue(task, dev);
c66ac9db
NB		 5067 }
5068 __transport_stop_task_timer(task, &flags);
5069
6708bb27 5070 if (!atomic_dec_and_test(&cmd->t_task_cdbs_ex_left)) {
c66ac9db 5071 spin_unlock_irqrestore(
a1d8b49a 5072 &cmd->t_state_lock, flags);
c66ac9db 5073
6708bb27 5074 pr_debug("Skipping task: %p, dev: %p for"
c66ac9db 5075 " t_task_cdbs_ex_left: %d\n", task, dev,
a1d8b49a 5076 atomic_read(&cmd->t_task_cdbs_ex_left));
c66ac9db
NB		 5077
5078 spin_lock_irqsave(&dev->execute_task_lock, flags);
5079 continue;
5080 }
5081
a1d8b49a 5082 if (atomic_read(&cmd->t_transport_active)) {
6708bb27 5083 pr_debug("got t_transport_active = 1 for task: %p, dev:"
c66ac9db
NB		 5084 " %p\n", task, dev);
5085
a1d8b49a 5086 if (atomic_read(&cmd->t_fe_count)) {
c66ac9db 5087 spin_unlock_irqrestore(
a1d8b49a 5088 &cmd->t_state_lock, flags);
c66ac9db
NB		 5089 transport_send_check_condition_and_sense(
5090 cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE,
5091 0);
5092 transport_remove_cmd_from_queue(cmd,
5951146d 5093 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5094
5095 transport_lun_remove_cmd(cmd);
5096 transport_cmd_check_stop(cmd, 1, 0);
5097 } else {
5098 spin_unlock_irqrestore(
a1d8b49a 5099 &cmd->t_state_lock, flags);
c66ac9db
NB		 5100
5101 transport_remove_cmd_from_queue(cmd,
5951146d 5102 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5103
5104 transport_lun_remove_cmd(cmd);
5105
5106 if (transport_cmd_check_stop(cmd, 1, 0))
35462975 5107 transport_generic_remove(cmd, 0);
c66ac9db
NB		 5108 }
5109
5110 spin_lock_irqsave(&dev->execute_task_lock, flags);
5111 continue;
5112 }
6708bb27 5113 pr_debug("Got t_transport_active = 0 for task: %p, dev: %p\n",
c66ac9db
NB		 5114 task, dev);
5115
a1d8b49a 5116 if (atomic_read(&cmd->t_fe_count)) {
c66ac9db 5117 spin_unlock_irqrestore(
a1d8b49a 5118 &cmd->t_state_lock, flags);
c66ac9db
NB		 5119 transport_send_check_condition_and_sense(cmd,
5120 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
5121 transport_remove_cmd_from_queue(cmd,
5951146d 5122 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5123
5124 transport_lun_remove_cmd(cmd);
5125 transport_cmd_check_stop(cmd, 1, 0);
5126 } else {
5127 spin_unlock_irqrestore(
a1d8b49a 5128 &cmd->t_state_lock, flags);
c66ac9db
NB		 5129
5130 transport_remove_cmd_from_queue(cmd,
5951146d 5131 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5132 transport_lun_remove_cmd(cmd);
5133
5134 if (transport_cmd_check_stop(cmd, 1, 0))
35462975 5135 transport_generic_remove(cmd, 0);
c66ac9db
NB		 5136 }
5137
5138 spin_lock_irqsave(&dev->execute_task_lock, flags);
5139 }
5140 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
5141 /*
5142 * Empty the struct se_device's struct se_cmd list.
5143 */
5951146d 5144 while ((cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj))) {
c66ac9db 5145
6708bb27 5146 pr_debug("From Device Queue: cmd: %p t_state: %d\n",
5951146d 5147 cmd, cmd->t_state);
c66ac9db 5148
a1d8b49a 5149 if (atomic_read(&cmd->t_fe_count)) {
c66ac9db
NB		 5150 transport_send_check_condition_and_sense(cmd,
5151 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
5152
5153 transport_lun_remove_cmd(cmd);
5154 transport_cmd_check_stop(cmd, 1, 0);
5155 } else {
5156 transport_lun_remove_cmd(cmd);
5157 if (transport_cmd_check_stop(cmd, 1, 0))
35462975 5158 transport_generic_remove(cmd, 0);
c66ac9db 5159 }
c66ac9db 5160 }
c66ac9db
NB		 5161}
5162
5163/* transport_processing_thread():
5164 *
5165 *
5166 */
5167static int transport_processing_thread(void *param)
5168{
5951146d 5169 int ret;
c66ac9db
NB		 5170 struct se_cmd *cmd;
5171 struct se_device *dev = (struct se_device *) param;
c66ac9db
NB		 5172
5173 set_user_nice(current, -20);
5174
5175 while (!kthread_should_stop()) {
e3d6f909
AG		 5176 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
5177 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 5178 kthread_should_stop());
5179 if (ret < 0)
5180 goto out;
5181
5182 spin_lock_irq(&dev->dev_status_lock);
5183 if (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) {
5184 spin_unlock_irq(&dev->dev_status_lock);
5185 transport_processing_shutdown(dev);
5186 continue;
5187 }
5188 spin_unlock_irq(&dev->dev_status_lock);
5189
5190get_cmd:
5191 __transport_execute_tasks(dev);
5192
5951146d
AG		 5193 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
5194 if (!cmd)
c66ac9db
NB		 5195 continue;
5196
5951146d 5197 switch (cmd->t_state) {
c66ac9db 5198 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 5199 if (!cmd->se_tfo->new_cmd_map) {
5200 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 5201 " NULL for TRANSPORT_NEW_CMD_MAP\n");
5202 BUG();
5203 }
e3d6f909 5204 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db
NB		 5205 if (ret < 0) {
5206 cmd->transport_error_status = ret;
5207 transport_generic_request_failure(cmd, NULL,
5208 0, (cmd->data_direction !=
5209 DMA_TO_DEVICE));
5210 break;
5211 }
5212 /* Fall through */
5213 case TRANSPORT_NEW_CMD:
5214 ret = transport_generic_new_cmd(cmd);
07bde79a
NB		 5215 if (ret == -EAGAIN)
5216 break;
5217 else if (ret < 0) {
c66ac9db
NB		 5218 cmd->transport_error_status = ret;
5219 transport_generic_request_failure(cmd, NULL,
5220 0, (cmd->data_direction !=
5221 DMA_TO_DEVICE));
5222 }
5223 break;
5224 case TRANSPORT_PROCESS_WRITE:
5225 transport_generic_process_write(cmd);
5226 break;
5227 case TRANSPORT_COMPLETE_OK:
5228 transport_stop_all_task_timers(cmd);
5229 transport_generic_complete_ok(cmd);
5230 break;
5231 case TRANSPORT_REMOVE:
35462975 5232 transport_generic_remove(cmd, 0);
c66ac9db 5233 break;
f4366772 5234 case TRANSPORT_FREE_CMD_INTR:
35462975 5235 transport_generic_free_cmd(cmd, 0, 0);
f4366772 5236 break;
c66ac9db
NB		 5237 case TRANSPORT_PROCESS_TMR:
5238 transport_generic_do_tmr(cmd);
5239 break;
5240 case TRANSPORT_COMPLETE_FAILURE:
5241 transport_generic_request_failure(cmd, NULL, 1, 1);
5242 break;
5243 case TRANSPORT_COMPLETE_TIMEOUT:
5244 transport_stop_all_task_timers(cmd);
5245 transport_generic_request_timeout(cmd);
5246 break;
07bde79a
NB		 5247 case TRANSPORT_COMPLETE_QF_WP:
5248 transport_generic_write_pending(cmd);
5249 break;
c66ac9db 5250 default:
6708bb27 5251 pr_err("Unknown t_state: %d deferred_t_state:"
c66ac9db 5252 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
5951146d 5253 " %u\n", cmd->t_state, cmd->deferred_t_state,
e3d6f909
AG		 5254 cmd->se_tfo->get_task_tag(cmd),
5255 cmd->se_tfo->get_cmd_state(cmd),
5256 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 5257 BUG();
5258 }
5259
5260 goto get_cmd;
5261 }
5262
5263out:
5264 transport_release_all_cmds(dev);
5265 dev->process_thread = NULL;
5266 return 0;
5267}
Linux kernel - Deliverables
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