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target: don't opencode transport_release_cmd in transport_release_fe_cmd
[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{
c66ac9db
NB		 596 transport_lun_remove_cmd(cmd);
597
598 if (transport_cmd_check_stop_to_fabric(cmd))
599 return;
77039d1e
NB		 600 if (remove) {
601 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
35462975 602 transport_generic_remove(cmd, 0);
77039d1e 603 }
c66ac9db
NB		 604}
605
606void transport_cmd_finish_abort_tmr(struct se_cmd *cmd)
607{
5951146d 608 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 609
610 if (transport_cmd_check_stop_to_fabric(cmd))
611 return;
612
35462975 613 transport_generic_remove(cmd, 0);
c66ac9db
NB		 614}
615
5951146d 616static void transport_add_cmd_to_queue(
c66ac9db
NB		 617 struct se_cmd *cmd,
618 int t_state)
619{
620 struct se_device *dev = cmd->se_dev;
e3d6f909 621 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 622 unsigned long flags;
623
c66ac9db 624 if (t_state) {
a1d8b49a 625 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 626 cmd->t_state = t_state;
a1d8b49a
AG		 627 atomic_set(&cmd->t_transport_active, 1);
628 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 629 }
630
631 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
79a7fef2
RD		 632
633 /* If the cmd is already on the list, remove it before we add it */
634 if (!list_empty(&cmd->se_queue_node))
635 list_del(&cmd->se_queue_node);
636 else
637 atomic_inc(&qobj->queue_cnt);
638
07bde79a
NB		 639 if (cmd->se_cmd_flags & SCF_EMULATE_QUEUE_FULL) {
640 cmd->se_cmd_flags &= ~SCF_EMULATE_QUEUE_FULL;
641 list_add(&cmd->se_queue_node, &qobj->qobj_list);
642 } else
643 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
79a7fef2 644 atomic_set(&cmd->t_transport_queue_active, 1);
c66ac9db
NB		 645 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
646
c66ac9db 647 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 648}
649
5951146d
AG		 650static struct se_cmd *
651transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 652{
5951146d 653 struct se_cmd *cmd;
c66ac9db
NB		 654 unsigned long flags;
655
656 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
657 if (list_empty(&qobj->qobj_list)) {
658 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
659 return NULL;
660 }
5951146d 661 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 662
79a7fef2 663 atomic_set(&cmd->t_transport_queue_active, 0);
c66ac9db 664
79a7fef2 665 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 666 atomic_dec(&qobj->queue_cnt);
667 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
668
5951146d 669 return cmd;
c66ac9db
NB		 670}
671
672static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
673 struct se_queue_obj *qobj)
674{
c66ac9db
NB		 675 unsigned long flags;
676
677 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
6708bb27 678 if (!atomic_read(&cmd->t_transport_queue_active)) {
c66ac9db
NB		 679 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
680 return;
681 }
79a7fef2
RD		 682 atomic_set(&cmd->t_transport_queue_active, 0);
683 atomic_dec(&qobj->queue_cnt);
684 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 685 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
686
a1d8b49a 687 if (atomic_read(&cmd->t_transport_queue_active)) {
6708bb27 688 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
e3d6f909 689 cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 690 atomic_read(&cmd->t_transport_queue_active));
c66ac9db
NB		 691 }
692}
693
694/*
695 * Completion function used by TCM subsystem plugins (such as FILEIO)
696 * for queueing up response from struct se_subsystem_api->do_task()
697 */
698void transport_complete_sync_cache(struct se_cmd *cmd, int good)
699{
a1d8b49a 700 struct se_task *task = list_entry(cmd->t_task_list.next,
c66ac9db
NB		 701 struct se_task, t_list);
702
703 if (good) {
704 cmd->scsi_status = SAM_STAT_GOOD;
705 task->task_scsi_status = GOOD;
706 } else {
707 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
708 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
e3d6f909 709 task->task_se_cmd->transport_error_status =
c66ac9db
NB		 710 PYX_TRANSPORT_ILLEGAL_REQUEST;
711 }
712
713 transport_complete_task(task, good);
714}
715EXPORT_SYMBOL(transport_complete_sync_cache);
716
717/* transport_complete_task():
718 *
719 * Called from interrupt and non interrupt context depending
720 * on the transport plugin.
721 */
722void transport_complete_task(struct se_task *task, int success)
723{
e3d6f909 724 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db
NB		 725 struct se_device *dev = task->se_dev;
726 int t_state;
727 unsigned long flags;
728#if 0
6708bb27 729 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
a1d8b49a 730 cmd->t_task_cdb[0], dev);
c66ac9db 731#endif
e3d6f909 732 if (dev)
c66ac9db 733 atomic_inc(&dev->depth_left);
c66ac9db 734
a1d8b49a 735 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 736 atomic_set(&task->task_active, 0);
737
738 /*
739 * See if any sense data exists, if so set the TASK_SENSE flag.
740 * Also check for any other post completion work that needs to be
741 * done by the plugins.
742 */
743 if (dev && dev->transport->transport_complete) {
744 if (dev->transport->transport_complete(task) != 0) {
745 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
746 task->task_sense = 1;
747 success = 1;
748 }
749 }
750
751 /*
752 * See if we are waiting for outstanding struct se_task
753 * to complete for an exception condition
754 */
755 if (atomic_read(&task->task_stop)) {
756 /*
a1d8b49a 757 * Decrement cmd->t_se_count if this task had
c66ac9db
NB		 758 * previously thrown its timeout exception handler.
759 */
760 if (atomic_read(&task->task_timeout)) {
a1d8b49a 761 atomic_dec(&cmd->t_se_count);
c66ac9db
NB		 762 atomic_set(&task->task_timeout, 0);
763 }
a1d8b49a 764 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 765
766 complete(&task->task_stop_comp);
767 return;
768 }
769 /*
770 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
771 * left counter to determine when the struct se_cmd is ready to be queued to
772 * the processing thread.
773 */
774 if (atomic_read(&task->task_timeout)) {
6708bb27
AG		 775 if (!atomic_dec_and_test(
776 &cmd->t_task_cdbs_timeout_left)) {
a1d8b49a 777 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 778 flags);
779 return;
780 }
781 t_state = TRANSPORT_COMPLETE_TIMEOUT;
a1d8b49a 782 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 783
784 transport_add_cmd_to_queue(cmd, t_state);
785 return;
786 }
a1d8b49a 787 atomic_dec(&cmd->t_task_cdbs_timeout_left);
c66ac9db
NB		 788
789 /*
790 * Decrement the outstanding t_task_cdbs_left count. The last
791 * struct se_task from struct se_cmd will complete itself into the
792 * device queue depending upon int success.
793 */
6708bb27 794 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
c66ac9db 795 if (!success)
a1d8b49a 796 cmd->t_tasks_failed = 1;
c66ac9db 797
a1d8b49a 798 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 799 return;
800 }
801
a1d8b49a 802 if (!success || cmd->t_tasks_failed) {
c66ac9db
NB		 803 t_state = TRANSPORT_COMPLETE_FAILURE;
804 if (!task->task_error_status) {
805 task->task_error_status =
806 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
807 cmd->transport_error_status =
808 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
809 }
810 } else {
a1d8b49a 811 atomic_set(&cmd->t_transport_complete, 1);
c66ac9db
NB		 812 t_state = TRANSPORT_COMPLETE_OK;
813 }
a1d8b49a 814 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 815
816 transport_add_cmd_to_queue(cmd, t_state);
817}
818EXPORT_SYMBOL(transport_complete_task);
819
820/*
821 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
822 * struct se_task list are ready to be added to the active execution list
823 * struct se_device
824
825 * Called with se_dev_t->execute_task_lock called.
826 */
827static inline int transport_add_task_check_sam_attr(
828 struct se_task *task,
829 struct se_task *task_prev,
830 struct se_device *dev)
831{
832 /*
833 * No SAM Task attribute emulation enabled, add to tail of
834 * execution queue
835 */
836 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
837 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
838 return 0;
839 }
840 /*
841 * HEAD_OF_QUEUE attribute for received CDB, which means
842 * the first task that is associated with a struct se_cmd goes to
843 * head of the struct se_device->execute_task_list, and task_prev
844 * after that for each subsequent task
845 */
e66ecd50 846 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 847 list_add(&task->t_execute_list,
848 (task_prev != NULL) ?
849 &task_prev->t_execute_list :
850 &dev->execute_task_list);
851
6708bb27 852 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
c66ac9db 853 " in execution queue\n",
6708bb27 854 task->task_se_cmd->t_task_cdb[0]);
c66ac9db
NB		 855 return 1;
856 }
857 /*
858 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
859 * transitioned from Dermant -> Active state, and are added to the end
860 * of the struct se_device->execute_task_list
861 */
862 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
863 return 0;
864}
865
866/* __transport_add_task_to_execute_queue():
867 *
868 * Called with se_dev_t->execute_task_lock called.
869 */
870static void __transport_add_task_to_execute_queue(
871 struct se_task *task,
872 struct se_task *task_prev,
873 struct se_device *dev)
874{
875 int head_of_queue;
876
877 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
878 atomic_inc(&dev->execute_tasks);
879
880 if (atomic_read(&task->task_state_active))
881 return;
882 /*
883 * Determine if this task needs to go to HEAD_OF_QUEUE for the
884 * state list as well. Running with SAM Task Attribute emulation
885 * will always return head_of_queue == 0 here
886 */
887 if (head_of_queue)
888 list_add(&task->t_state_list, (task_prev) ?
889 &task_prev->t_state_list :
890 &dev->state_task_list);
891 else
892 list_add_tail(&task->t_state_list, &dev->state_task_list);
893
894 atomic_set(&task->task_state_active, 1);
895
6708bb27 896 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
e3d6f909 897 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
c66ac9db
NB		 898 task, dev);
899}
900
901static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
902{
903 struct se_device *dev;
904 struct se_task *task;
905 unsigned long flags;
906
a1d8b49a
AG		 907 spin_lock_irqsave(&cmd->t_state_lock, flags);
908 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 909 dev = task->se_dev;
910
911 if (atomic_read(&task->task_state_active))
912 continue;
913
914 spin_lock(&dev->execute_task_lock);
915 list_add_tail(&task->t_state_list, &dev->state_task_list);
916 atomic_set(&task->task_state_active, 1);
917
6708bb27
AG		 918 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
919 task->task_se_cmd->se_tfo->get_task_tag(
c66ac9db
NB		 920 task->task_se_cmd), task, dev);
921
922 spin_unlock(&dev->execute_task_lock);
923 }
a1d8b49a 924 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 925}
926
927static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
928{
5951146d 929 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 930 struct se_task *task, *task_prev = NULL;
931 unsigned long flags;
932
933 spin_lock_irqsave(&dev->execute_task_lock, flags);
a1d8b49a 934 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 935 if (atomic_read(&task->task_execute_queue))
936 continue;
937 /*
938 * __transport_add_task_to_execute_queue() handles the
939 * SAM Task Attribute emulation if enabled
940 */
941 __transport_add_task_to_execute_queue(task, task_prev, dev);
942 atomic_set(&task->task_execute_queue, 1);
943 task_prev = task;
944 }
945 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 946}
947
948/* transport_remove_task_from_execute_queue():
949 *
950 *
951 */
52208ae3 952void transport_remove_task_from_execute_queue(
c66ac9db
NB		 953 struct se_task *task,
954 struct se_device *dev)
955{
956 unsigned long flags;
957
af57c3ac
NB		 958 if (atomic_read(&task->task_execute_queue) == 0) {
959 dump_stack();
960 return;
961 }
962
c66ac9db
NB		 963 spin_lock_irqsave(&dev->execute_task_lock, flags);
964 list_del(&task->t_execute_list);
af57c3ac 965 atomic_set(&task->task_execute_queue, 0);
c66ac9db
NB		 966 atomic_dec(&dev->execute_tasks);
967 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
968}
969
07bde79a
NB		 970/*
971 * Handle QUEUE_FULL / -EAGAIN status
972 */
973
974static void target_qf_do_work(struct work_struct *work)
975{
976 struct se_device *dev = container_of(work, struct se_device,
977 qf_work_queue);
bcac364a 978 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 979 struct se_cmd *cmd, *cmd_tmp;
980
981 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 982 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
983 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 984
bcac364a 985 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 986 list_del(&cmd->se_qf_node);
987 atomic_dec(&dev->dev_qf_count);
988 smp_mb__after_atomic_dec();
07bde79a 989
6708bb27 990 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a
NB		 991 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
992 (cmd->t_state == TRANSPORT_COMPLETE_OK) ? "COMPLETE_OK" :
993 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
994 : "UNKNOWN");
995 /*
996 * The SCF_EMULATE_QUEUE_FULL flag will be cleared once se_cmd
997 * has been added to head of queue
998 */
999 transport_add_cmd_to_queue(cmd, cmd->t_state);
07bde79a 1000 }
07bde79a
NB		 1001}
1002
c66ac9db
NB		 1003unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
1004{
1005 switch (cmd->data_direction) {
1006 case DMA_NONE:
1007 return "NONE";
1008 case DMA_FROM_DEVICE:
1009 return "READ";
1010 case DMA_TO_DEVICE:
1011 return "WRITE";
1012 case DMA_BIDIRECTIONAL:
1013 return "BIDI";
1014 default:
1015 break;
1016 }
1017
1018 return "UNKNOWN";
1019}
1020
1021void transport_dump_dev_state(
1022 struct se_device *dev,
1023 char *b,
1024 int *bl)
1025{
1026 *bl += sprintf(b + *bl, "Status: ");
1027 switch (dev->dev_status) {
1028 case TRANSPORT_DEVICE_ACTIVATED:
1029 *bl += sprintf(b + *bl, "ACTIVATED");
1030 break;
1031 case TRANSPORT_DEVICE_DEACTIVATED:
1032 *bl += sprintf(b + *bl, "DEACTIVATED");
1033 break;
1034 case TRANSPORT_DEVICE_SHUTDOWN:
1035 *bl += sprintf(b + *bl, "SHUTDOWN");
1036 break;
1037 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
1038 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
1039 *bl += sprintf(b + *bl, "OFFLINE");
1040 break;
1041 default:
1042 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
1043 break;
1044 }
1045
1046 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
1047 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
1048 dev->queue_depth);
1049 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
e3d6f909 1050 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db
NB		 1051 *bl += sprintf(b + *bl, " ");
1052}
1053
1054/* transport_release_all_cmds():
1055 *
1056 *
1057 */
1058static void transport_release_all_cmds(struct se_device *dev)
1059{
5951146d 1060 struct se_cmd *cmd, *tcmd;
c66ac9db
NB		 1061 int bug_out = 0, t_state;
1062 unsigned long flags;
1063
e3d6f909 1064 spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
5951146d
AG		 1065 list_for_each_entry_safe(cmd, tcmd, &dev->dev_queue_obj.qobj_list,
1066 se_queue_node) {
1067 t_state = cmd->t_state;
79a7fef2 1068 list_del_init(&cmd->se_queue_node);
e3d6f909 1069 spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock,
c66ac9db
NB		 1070 flags);
1071
6708bb27 1072 pr_err("Releasing ITT: 0x%08x, i_state: %u,"
c66ac9db 1073 " t_state: %u directly\n",
e3d6f909
AG		 1074 cmd->se_tfo->get_task_tag(cmd),
1075 cmd->se_tfo->get_cmd_state(cmd), t_state);
c66ac9db
NB		 1076
1077 transport_release_fe_cmd(cmd);
1078 bug_out = 1;
1079
e3d6f909 1080 spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
c66ac9db 1081 }
e3d6f909 1082 spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock, flags);
c66ac9db
NB		 1083#if 0
1084 if (bug_out)
1085 BUG();
1086#endif
1087}
1088
1089void transport_dump_vpd_proto_id(
1090 struct t10_vpd *vpd,
1091 unsigned char *p_buf,
1092 int p_buf_len)
1093{
1094 unsigned char buf[VPD_TMP_BUF_SIZE];
1095 int len;
1096
1097 memset(buf, 0, VPD_TMP_BUF_SIZE);
1098 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1099
1100 switch (vpd->protocol_identifier) {
1101 case 0x00:
1102 sprintf(buf+len, "Fibre Channel\n");
1103 break;
1104 case 0x10:
1105 sprintf(buf+len, "Parallel SCSI\n");
1106 break;
1107 case 0x20:
1108 sprintf(buf+len, "SSA\n");
1109 break;
1110 case 0x30:
1111 sprintf(buf+len, "IEEE 1394\n");
1112 break;
1113 case 0x40:
1114 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1115 " Protocol\n");
1116 break;
1117 case 0x50:
1118 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1119 break;
1120 case 0x60:
1121 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1122 break;
1123 case 0x70:
1124 sprintf(buf+len, "Automation/Drive Interface Transport"
1125 " Protocol\n");
1126 break;
1127 case 0x80:
1128 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1129 break;
1130 default:
1131 sprintf(buf+len, "Unknown 0x%02x\n",
1132 vpd->protocol_identifier);
1133 break;
1134 }
1135
1136 if (p_buf)
1137 strncpy(p_buf, buf, p_buf_len);
1138 else
6708bb27 1139 pr_debug("%s", buf);
c66ac9db
NB		 1140}
1141
1142void
1143transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1144{
1145 /*
1146 * Check if the Protocol Identifier Valid (PIV) bit is set..
1147 *
1148 * from spc3r23.pdf section 7.5.1
1149 */
1150 if (page_83[1] & 0x80) {
1151 vpd->protocol_identifier = (page_83[0] & 0xf0);
1152 vpd->protocol_identifier_set = 1;
1153 transport_dump_vpd_proto_id(vpd, NULL, 0);
1154 }
1155}
1156EXPORT_SYMBOL(transport_set_vpd_proto_id);
1157
1158int transport_dump_vpd_assoc(
1159 struct t10_vpd *vpd,
1160 unsigned char *p_buf,
1161 int p_buf_len)
1162{
1163 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1164 int ret = 0;
1165 int len;
c66ac9db
NB		 1166
1167 memset(buf, 0, VPD_TMP_BUF_SIZE);
1168 len = sprintf(buf, "T10 VPD Identifier Association: ");
1169
1170 switch (vpd->association) {
1171 case 0x00:
1172 sprintf(buf+len, "addressed logical unit\n");
1173 break;
1174 case 0x10:
1175 sprintf(buf+len, "target port\n");
1176 break;
1177 case 0x20:
1178 sprintf(buf+len, "SCSI target device\n");
1179 break;
1180 default:
1181 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 1182 ret = -EINVAL;
c66ac9db
NB		 1183 break;
1184 }
1185
1186 if (p_buf)
1187 strncpy(p_buf, buf, p_buf_len);
1188 else
6708bb27 1189 pr_debug("%s", buf);
c66ac9db
NB		 1190
1191 return ret;
1192}
1193
1194int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1195{
1196 /*
1197 * The VPD identification association..
1198 *
1199 * from spc3r23.pdf Section 7.6.3.1 Table 297
1200 */
1201 vpd->association = (page_83[1] & 0x30);
1202 return transport_dump_vpd_assoc(vpd, NULL, 0);
1203}
1204EXPORT_SYMBOL(transport_set_vpd_assoc);
1205
1206int transport_dump_vpd_ident_type(
1207 struct t10_vpd *vpd,
1208 unsigned char *p_buf,
1209 int p_buf_len)
1210{
1211 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1212 int ret = 0;
1213 int len;
c66ac9db
NB		 1214
1215 memset(buf, 0, VPD_TMP_BUF_SIZE);
1216 len = sprintf(buf, "T10 VPD Identifier Type: ");
1217
1218 switch (vpd->device_identifier_type) {
1219 case 0x00:
1220 sprintf(buf+len, "Vendor specific\n");
1221 break;
1222 case 0x01:
1223 sprintf(buf+len, "T10 Vendor ID based\n");
1224 break;
1225 case 0x02:
1226 sprintf(buf+len, "EUI-64 based\n");
1227 break;
1228 case 0x03:
1229 sprintf(buf+len, "NAA\n");
1230 break;
1231 case 0x04:
1232 sprintf(buf+len, "Relative target port identifier\n");
1233 break;
1234 case 0x08:
1235 sprintf(buf+len, "SCSI name string\n");
1236 break;
1237 default:
1238 sprintf(buf+len, "Unsupported: 0x%02x\n",
1239 vpd->device_identifier_type);
e3d6f909 1240 ret = -EINVAL;
c66ac9db
NB		 1241 break;
1242 }
1243
e3d6f909
AG		 1244 if (p_buf) {
1245 if (p_buf_len < strlen(buf)+1)
1246 return -EINVAL;
c66ac9db 1247 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1248 } else {
6708bb27 1249 pr_debug("%s", buf);
e3d6f909 1250 }
c66ac9db
NB		 1251
1252 return ret;
1253}
1254
1255int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1256{
1257 /*
1258 * The VPD identifier type..
1259 *
1260 * from spc3r23.pdf Section 7.6.3.1 Table 298
1261 */
1262 vpd->device_identifier_type = (page_83[1] & 0x0f);
1263 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1264}
1265EXPORT_SYMBOL(transport_set_vpd_ident_type);
1266
1267int transport_dump_vpd_ident(
1268 struct t10_vpd *vpd,
1269 unsigned char *p_buf,
1270 int p_buf_len)
1271{
1272 unsigned char buf[VPD_TMP_BUF_SIZE];
1273 int ret = 0;
1274
1275 memset(buf, 0, VPD_TMP_BUF_SIZE);
1276
1277 switch (vpd->device_identifier_code_set) {
1278 case 0x01: /* Binary */
1279 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1280 &vpd->device_identifier[0]);
1281 break;
1282 case 0x02: /* ASCII */
1283 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1284 &vpd->device_identifier[0]);
1285 break;
1286 case 0x03: /* UTF-8 */
1287 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1288 &vpd->device_identifier[0]);
1289 break;
1290 default:
1291 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1292 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1293 ret = -EINVAL;
c66ac9db
NB		 1294 break;
1295 }
1296
1297 if (p_buf)
1298 strncpy(p_buf, buf, p_buf_len);
1299 else
6708bb27 1300 pr_debug("%s", buf);
c66ac9db
NB		 1301
1302 return ret;
1303}
1304
1305int
1306transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1307{
1308 static const char hex_str[] = "0123456789abcdef";
1309 int j = 0, i = 4; /* offset to start of the identifer */
1310
1311 /*
1312 * The VPD Code Set (encoding)
1313 *
1314 * from spc3r23.pdf Section 7.6.3.1 Table 296
1315 */
1316 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1317 switch (vpd->device_identifier_code_set) {
1318 case 0x01: /* Binary */
1319 vpd->device_identifier[j++] =
1320 hex_str[vpd->device_identifier_type];
1321 while (i < (4 + page_83[3])) {
1322 vpd->device_identifier[j++] =
1323 hex_str[(page_83[i] & 0xf0) >> 4];
1324 vpd->device_identifier[j++] =
1325 hex_str[page_83[i] & 0x0f];
1326 i++;
1327 }
1328 break;
1329 case 0x02: /* ASCII */
1330 case 0x03: /* UTF-8 */
1331 while (i < (4 + page_83[3]))
1332 vpd->device_identifier[j++] = page_83[i++];
1333 break;
1334 default:
1335 break;
1336 }
1337
1338 return transport_dump_vpd_ident(vpd, NULL, 0);
1339}
1340EXPORT_SYMBOL(transport_set_vpd_ident);
1341
1342static void core_setup_task_attr_emulation(struct se_device *dev)
1343{
1344 /*
1345 * If this device is from Target_Core_Mod/pSCSI, disable the
1346 * SAM Task Attribute emulation.
1347 *
1348 * This is currently not available in upsream Linux/SCSI Target
1349 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1350 */
e3d6f909 1351 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1352 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1353 return;
1354 }
1355
1356 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1357 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1358 " device\n", dev->transport->name,
1359 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1360}
1361
1362static void scsi_dump_inquiry(struct se_device *dev)
1363{
e3d6f909 1364 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
c66ac9db
NB		 1365 int i, device_type;
1366 /*
1367 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1368 */
6708bb27 1369 pr_debug(" Vendor: ");
c66ac9db
NB		 1370 for (i = 0; i < 8; i++)
1371 if (wwn->vendor[i] >= 0x20)
6708bb27 1372 pr_debug("%c", wwn->vendor[i]);
c66ac9db 1373 else
6708bb27 1374 pr_debug(" ");
c66ac9db 1375
6708bb27 1376 pr_debug(" Model: ");
c66ac9db
NB		 1377 for (i = 0; i < 16; i++)
1378 if (wwn->model[i] >= 0x20)
6708bb27 1379 pr_debug("%c", wwn->model[i]);
c66ac9db 1380 else
6708bb27 1381 pr_debug(" ");
c66ac9db 1382
6708bb27 1383 pr_debug(" Revision: ");
c66ac9db
NB		 1384 for (i = 0; i < 4; i++)
1385 if (wwn->revision[i] >= 0x20)
6708bb27 1386 pr_debug("%c", wwn->revision[i]);
c66ac9db 1387 else
6708bb27 1388 pr_debug(" ");
c66ac9db 1389
6708bb27 1390 pr_debug("\n");
c66ac9db 1391
e3d6f909 1392 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1393 pr_debug(" Type: %s ", scsi_device_type(device_type));
1394 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1395 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1396}
1397
1398struct se_device *transport_add_device_to_core_hba(
1399 struct se_hba *hba,
1400 struct se_subsystem_api *transport,
1401 struct se_subsystem_dev *se_dev,
1402 u32 device_flags,
1403 void *transport_dev,
1404 struct se_dev_limits *dev_limits,
1405 const char *inquiry_prod,
1406 const char *inquiry_rev)
1407{
12a18bdc 1408 int force_pt;
c66ac9db
NB		 1409 struct se_device *dev;
1410
1411 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1412 if (!dev) {
1413 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1414 return NULL;
1415 }
c66ac9db 1416
e3d6f909 1417 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1418 dev->dev_flags = device_flags;
1419 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1420 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1421 dev->se_hba = hba;
1422 dev->se_sub_dev = se_dev;
1423 dev->transport = transport;
1424 atomic_set(&dev->active_cmds, 0);
1425 INIT_LIST_HEAD(&dev->dev_list);
1426 INIT_LIST_HEAD(&dev->dev_sep_list);
1427 INIT_LIST_HEAD(&dev->dev_tmr_list);
1428 INIT_LIST_HEAD(&dev->execute_task_list);
1429 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1430 INIT_LIST_HEAD(&dev->ordered_cmd_list);
1431 INIT_LIST_HEAD(&dev->state_task_list);
07bde79a 1432 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1433 spin_lock_init(&dev->execute_task_lock);
1434 spin_lock_init(&dev->delayed_cmd_lock);
1435 spin_lock_init(&dev->ordered_cmd_lock);
1436 spin_lock_init(&dev->state_task_lock);
1437 spin_lock_init(&dev->dev_alua_lock);
1438 spin_lock_init(&dev->dev_reservation_lock);
1439 spin_lock_init(&dev->dev_status_lock);
1440 spin_lock_init(&dev->dev_status_thr_lock);
1441 spin_lock_init(&dev->se_port_lock);
1442 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1443 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1444
1445 dev->queue_depth = dev_limits->queue_depth;
1446 atomic_set(&dev->depth_left, dev->queue_depth);
1447 atomic_set(&dev->dev_ordered_id, 0);
1448
1449 se_dev_set_default_attribs(dev, dev_limits);
1450
1451 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1452 dev->creation_time = get_jiffies_64();
1453 spin_lock_init(&dev->stats_lock);
1454
1455 spin_lock(&hba->device_lock);
1456 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1457 hba->dev_count++;
1458 spin_unlock(&hba->device_lock);
1459 /*
1460 * Setup the SAM Task Attribute emulation for struct se_device
1461 */
1462 core_setup_task_attr_emulation(dev);
1463 /*
1464 * Force PR and ALUA passthrough emulation with internal object use.
1465 */
1466 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1467 /*
1468 * Setup the Reservations infrastructure for struct se_device
1469 */
1470 core_setup_reservations(dev, force_pt);
1471 /*
1472 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1473 */
1474 if (core_setup_alua(dev, force_pt) < 0)
1475 goto out;
1476
1477 /*
1478 * Startup the struct se_device processing thread
1479 */
1480 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1481 "LIO_%s", dev->transport->name);
c66ac9db 1482 if (IS_ERR(dev->process_thread)) {
6708bb27 1483 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1484 dev->transport->name);
c66ac9db
NB		 1485 goto out;
1486 }
07bde79a
NB		 1487 /*
1488 * Setup work_queue for QUEUE_FULL
1489 */
1490 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1491 /*
1492 * Preload the initial INQUIRY const values if we are doing
1493 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1494 * passthrough because this is being provided by the backend LLD.
1495 * This is required so that transport_get_inquiry() copies these
1496 * originals once back into DEV_T10_WWN(dev) for the virtual device
1497 * setup.
1498 */
e3d6f909 1499 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1500 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1501 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1502 " INQUIRY consts\n");
1503 goto out;
1504 }
1505
e3d6f909
AG		 1506 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1507 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1508 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1509 }
1510 scsi_dump_inquiry(dev);
1511
12a18bdc 1512 return dev;
c66ac9db 1513out:
c66ac9db
NB		 1514 kthread_stop(dev->process_thread);
1515
1516 spin_lock(&hba->device_lock);
1517 list_del(&dev->dev_list);
1518 hba->dev_count--;
1519 spin_unlock(&hba->device_lock);
1520
1521 se_release_vpd_for_dev(dev);
1522
c66ac9db
NB		 1523 kfree(dev);
1524
1525 return NULL;
1526}
1527EXPORT_SYMBOL(transport_add_device_to_core_hba);
1528
1529/* transport_generic_prepare_cdb():
1530 *
1531 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1532 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1533 * The point of this is since we are mapping iSCSI LUNs to
1534 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1535 * devices and HBAs for a loop.
1536 */
1537static inline void transport_generic_prepare_cdb(
1538 unsigned char *cdb)
1539{
1540 switch (cdb[0]) {
1541 case READ_10: /* SBC - RDProtect */
1542 case READ_12: /* SBC - RDProtect */
1543 case READ_16: /* SBC - RDProtect */
1544 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1545 case VERIFY: /* SBC - VRProtect */
1546 case VERIFY_16: /* SBC - VRProtect */
1547 case WRITE_VERIFY: /* SBC - VRProtect */
1548 case WRITE_VERIFY_12: /* SBC - VRProtect */
1549 break;
1550 default:
1551 cdb[1] &= 0x1f; /* clear logical unit number */
1552 break;
1553 }
1554}
1555
1556static struct se_task *
1557transport_generic_get_task(struct se_cmd *cmd,
1558 enum dma_data_direction data_direction)
1559{
1560 struct se_task *task;
5951146d 1561 struct se_device *dev = cmd->se_dev;
c66ac9db 1562
6708bb27 1563 task = dev->transport->alloc_task(cmd->t_task_cdb);
c66ac9db 1564 if (!task) {
6708bb27 1565 pr_err("Unable to allocate struct se_task\n");
c66ac9db
NB		 1566 return NULL;
1567 }
1568
1569 INIT_LIST_HEAD(&task->t_list);
1570 INIT_LIST_HEAD(&task->t_execute_list);
1571 INIT_LIST_HEAD(&task->t_state_list);
1572 init_completion(&task->task_stop_comp);
c66ac9db
NB		 1573 task->task_se_cmd = cmd;
1574 task->se_dev = dev;
1575 task->task_data_direction = data_direction;
1576
c66ac9db
NB		 1577 return task;
1578}
1579
1580static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1581
c66ac9db
NB		 1582/*
1583 * Used by fabric modules containing a local struct se_cmd within their
1584 * fabric dependent per I/O descriptor.
1585 */
1586void transport_init_se_cmd(
1587 struct se_cmd *cmd,
1588 struct target_core_fabric_ops *tfo,
1589 struct se_session *se_sess,
1590 u32 data_length,
1591 int data_direction,
1592 int task_attr,
1593 unsigned char *sense_buffer)
1594{
5951146d
AG		 1595 INIT_LIST_HEAD(&cmd->se_lun_node);
1596 INIT_LIST_HEAD(&cmd->se_delayed_node);
1597 INIT_LIST_HEAD(&cmd->se_ordered_node);
07bde79a 1598 INIT_LIST_HEAD(&cmd->se_qf_node);
79a7fef2 1599 INIT_LIST_HEAD(&cmd->se_queue_node);
c66ac9db 1600
a1d8b49a
AG		 1601 INIT_LIST_HEAD(&cmd->t_task_list);
1602 init_completion(&cmd->transport_lun_fe_stop_comp);
1603 init_completion(&cmd->transport_lun_stop_comp);
1604 init_completion(&cmd->t_transport_stop_comp);
1605 spin_lock_init(&cmd->t_state_lock);
1606 atomic_set(&cmd->transport_dev_active, 1);
c66ac9db
NB		 1607
1608 cmd->se_tfo = tfo;
1609 cmd->se_sess = se_sess;
1610 cmd->data_length = data_length;
1611 cmd->data_direction = data_direction;
1612 cmd->sam_task_attr = task_attr;
1613 cmd->sense_buffer = sense_buffer;
1614}
1615EXPORT_SYMBOL(transport_init_se_cmd);
1616
1617static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1618{
1619 /*
1620 * Check if SAM Task Attribute emulation is enabled for this
1621 * struct se_device storage object
1622 */
5951146d 1623 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1624 return 0;
1625
e66ecd50 1626 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1627 pr_debug("SAM Task Attribute ACA"
c66ac9db 1628 " emulation is not supported\n");
e3d6f909 1629 return -EINVAL;
c66ac9db
NB		 1630 }
1631 /*
1632 * Used to determine when ORDERED commands should go from
1633 * Dormant to Active status.
1634 */
5951146d 1635 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1636 smp_mb__after_atomic_inc();
6708bb27 1637 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1638 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1639 cmd->se_dev->transport->name);
c66ac9db
NB		 1640 return 0;
1641}
1642
1643void transport_free_se_cmd(
1644 struct se_cmd *se_cmd)
1645{
1646 if (se_cmd->se_tmr_req)
1647 core_tmr_release_req(se_cmd->se_tmr_req);
1648 /*
1649 * Check and free any extended CDB buffer that was allocated
1650 */
a1d8b49a
AG		 1651 if (se_cmd->t_task_cdb != se_cmd->__t_task_cdb)
1652 kfree(se_cmd->t_task_cdb);
c66ac9db
NB		 1653}
1654EXPORT_SYMBOL(transport_free_se_cmd);
1655
1656static void transport_generic_wait_for_tasks(struct se_cmd *, int, int);
1657
1658/* transport_generic_allocate_tasks():
1659 *
1660 * Called from fabric RX Thread.
1661 */
1662int transport_generic_allocate_tasks(
1663 struct se_cmd *cmd,
1664 unsigned char *cdb)
1665{
1666 int ret;
1667
1668 transport_generic_prepare_cdb(cdb);
1669
1670 /*
1671 * This is needed for early exceptions.
1672 */
1673 cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
1674
c66ac9db
NB		 1675 /*
1676 * Ensure that the received CDB is less than the max (252 + 8) bytes
1677 * for VARIABLE_LENGTH_CMD
1678 */
1679 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1680 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1681 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1682 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
e3d6f909 1683 return -EINVAL;
c66ac9db
NB		 1684 }
1685 /*
1686 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1687 * allocate the additional extended CDB buffer now.. Otherwise
1688 * setup the pointer from __t_task_cdb to t_task_cdb.
1689 */
a1d8b49a
AG		 1690 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1691 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1692 GFP_KERNEL);
6708bb27
AG		 1693 if (!cmd->t_task_cdb) {
1694 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1695 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1696 scsi_command_size(cdb),
a1d8b49a 1697 (unsigned long)sizeof(cmd->__t_task_cdb));
e3d6f909 1698 return -ENOMEM;
c66ac9db
NB		 1699 }
1700 } else
a1d8b49a 1701 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1702 /*
a1d8b49a 1703 * Copy the original CDB into cmd->
c66ac9db 1704 */
a1d8b49a 1705 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1706 /*
1707 * Setup the received CDB based on SCSI defined opcodes and
1708 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1709 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1710 * pointer is expected to be setup before we reach this point.
1711 */
1712 ret = transport_generic_cmd_sequencer(cmd, cdb);
1713 if (ret < 0)
1714 return ret;
1715 /*
1716 * Check for SAM Task Attribute Emulation
1717 */
1718 if (transport_check_alloc_task_attr(cmd) < 0) {
1719 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1720 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1721 return -EINVAL;
c66ac9db
NB		 1722 }
1723 spin_lock(&cmd->se_lun->lun_sep_lock);
1724 if (cmd->se_lun->lun_sep)
1725 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1726 spin_unlock(&cmd->se_lun->lun_sep_lock);
1727 return 0;
1728}
1729EXPORT_SYMBOL(transport_generic_allocate_tasks);
1730
dd8ae59d
NB		 1731static void transport_generic_request_failure(struct se_cmd *,
1732 struct se_device *, int, int);
695434e1
NB		 1733/*
1734 * Used by fabric module frontends to queue tasks directly.
1735 * Many only be used from process context only
1736 */
1737int transport_handle_cdb_direct(
1738 struct se_cmd *cmd)
1739{
dd8ae59d
NB		 1740 int ret;
1741
695434e1
NB		 1742 if (!cmd->se_lun) {
1743 dump_stack();
6708bb27 1744 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1745 return -EINVAL;
1746 }
1747 if (in_interrupt()) {
1748 dump_stack();
6708bb27 1749 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1750 " from interrupt context\n");
1751 return -EINVAL;
1752 }
dd8ae59d
NB		 1753 /*
1754 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1755 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1756 * in existing usage to ensure that outstanding descriptors are handled
1757 * correctly during shutdown via transport_generic_wait_for_tasks()
1758 *
1759 * Also, we don't take cmd->t_state_lock here as we only expect
1760 * this to be called for initial descriptor submission.
1761 */
1762 cmd->t_state = TRANSPORT_NEW_CMD;
1763 atomic_set(&cmd->t_transport_active, 1);
1764 /*
1765 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1766 * so follow TRANSPORT_NEW_CMD processing thread context usage
1767 * and call transport_generic_request_failure() if necessary..
1768 */
1769 ret = transport_generic_new_cmd(cmd);
1770 if (ret == -EAGAIN)
1771 return 0;
1772 else if (ret < 0) {
1773 cmd->transport_error_status = ret;
1774 transport_generic_request_failure(cmd, NULL, 0,
1775 (cmd->data_direction != DMA_TO_DEVICE));
1776 }
1777 return 0;
695434e1
NB		 1778}
1779EXPORT_SYMBOL(transport_handle_cdb_direct);
1780
c66ac9db
NB		 1781/*
1782 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1783 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1784 * complete setup in TCM process context w/ TFO->new_cmd_map().
1785 */
1786int transport_generic_handle_cdb_map(
1787 struct se_cmd *cmd)
1788{
e3d6f909 1789 if (!cmd->se_lun) {
c66ac9db 1790 dump_stack();
6708bb27 1791 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1792 return -EINVAL;
c66ac9db
NB		 1793 }
1794
1795 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP);
1796 return 0;
1797}
1798EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1799
1800/* transport_generic_handle_data():
1801 *
1802 *
1803 */
1804int transport_generic_handle_data(
1805 struct se_cmd *cmd)
1806{
1807 /*
1808 * For the software fabric case, then we assume the nexus is being
1809 * failed/shutdown when signals are pending from the kthread context
1810 * caller, so we return a failure. For the HW target mode case running
1811 * in interrupt code, the signal_pending() check is skipped.
1812 */
1813 if (!in_interrupt() && signal_pending(current))
e3d6f909 1814 return -EPERM;
c66ac9db
NB		 1815 /*
1816 * If the received CDB has aleady been ABORTED by the generic
1817 * target engine, we now call transport_check_aborted_status()
1818 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1819 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1820 * sequences at this point.
1821 */
1822 if (transport_check_aborted_status(cmd, 1) != 0)
1823 return 0;
1824
1825 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE);
1826 return 0;
1827}
1828EXPORT_SYMBOL(transport_generic_handle_data);
1829
1830/* transport_generic_handle_tmr():
1831 *
1832 *
1833 */
1834int transport_generic_handle_tmr(
1835 struct se_cmd *cmd)
1836{
1837 /*
1838 * This is needed for early exceptions.
1839 */
1840 cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
c66ac9db
NB		 1841
1842 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR);
1843 return 0;
1844}
1845EXPORT_SYMBOL(transport_generic_handle_tmr);
1846
f4366772
NB		 1847void transport_generic_free_cmd_intr(
1848 struct se_cmd *cmd)
1849{
1850 transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR);
1851}
1852EXPORT_SYMBOL(transport_generic_free_cmd_intr);
1853
c66ac9db
NB		 1854static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1855{
1856 struct se_task *task, *task_tmp;
1857 unsigned long flags;
1858 int ret = 0;
1859
6708bb27 1860 pr_debug("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 1861 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 1862
1863 /*
1864 * No tasks remain in the execution queue
1865 */
a1d8b49a 1866 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1867 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 1868 &cmd->t_task_list, t_list) {
6708bb27 1869 pr_debug("task_no[%d] - Processing task %p\n",
c66ac9db
NB		 1870 task->task_no, task);
1871 /*
1872 * If the struct se_task has not been sent and is not active,
1873 * remove the struct se_task from the execution queue.
1874 */
1875 if (!atomic_read(&task->task_sent) &&
1876 !atomic_read(&task->task_active)) {
a1d8b49a 1877 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1878 flags);
1879 transport_remove_task_from_execute_queue(task,
1880 task->se_dev);
1881
6708bb27 1882 pr_debug("task_no[%d] - Removed from execute queue\n",
c66ac9db 1883 task->task_no);
a1d8b49a 1884 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 1885 continue;
1886 }
1887
1888 /*
1889 * If the struct se_task is active, sleep until it is returned
1890 * from the plugin.
1891 */
1892 if (atomic_read(&task->task_active)) {
1893 atomic_set(&task->task_stop, 1);
a1d8b49a 1894 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1895 flags);
1896
6708bb27 1897 pr_debug("task_no[%d] - Waiting to complete\n",
c66ac9db
NB		 1898 task->task_no);
1899 wait_for_completion(&task->task_stop_comp);
6708bb27 1900 pr_debug("task_no[%d] - Stopped successfully\n",
c66ac9db
NB		 1901 task->task_no);
1902
a1d8b49a
AG		 1903 spin_lock_irqsave(&cmd->t_state_lock, flags);
1904 atomic_dec(&cmd->t_task_cdbs_left);
c66ac9db
NB		 1905
1906 atomic_set(&task->task_active, 0);
1907 atomic_set(&task->task_stop, 0);
1908 } else {
6708bb27 1909 pr_debug("task_no[%d] - Did nothing\n", task->task_no);
c66ac9db
NB		 1910 ret++;
1911 }
1912
1913 __transport_stop_task_timer(task, &flags);
1914 }
a1d8b49a 1915 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1916
1917 return ret;
1918}
1919
c66ac9db
NB		 1920/*
1921 * Handle SAM-esque emulation for generic transport request failures.
1922 */
1923static void transport_generic_request_failure(
1924 struct se_cmd *cmd,
1925 struct se_device *dev,
1926 int complete,
1927 int sc)
1928{
07bde79a
NB		 1929 int ret = 0;
1930
6708bb27 1931 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1932 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1933 cmd->t_task_cdb[0]);
6708bb27 1934 pr_debug("-----[ i_state: %d t_state/def_t_state:"
c66ac9db 1935 " %d/%d transport_error_status: %d\n",
e3d6f909 1936 cmd->se_tfo->get_cmd_state(cmd),
c66ac9db
NB		 1937 cmd->t_state, cmd->deferred_t_state,
1938 cmd->transport_error_status);
6708bb27 1939 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
c66ac9db
NB		 1940 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1941 " t_transport_active: %d t_transport_stop: %d"
6708bb27 1942 " t_transport_sent: %d\n", cmd->t_task_list_num,
a1d8b49a
AG		 1943 atomic_read(&cmd->t_task_cdbs_left),
1944 atomic_read(&cmd->t_task_cdbs_sent),
1945 atomic_read(&cmd->t_task_cdbs_ex_left),
1946 atomic_read(&cmd->t_transport_active),
1947 atomic_read(&cmd->t_transport_stop),
1948 atomic_read(&cmd->t_transport_sent));
c66ac9db
NB		 1949
1950 transport_stop_all_task_timers(cmd);
1951
1952 if (dev)
e3d6f909 1953 atomic_inc(&dev->depth_left);
c66ac9db
NB		 1954 /*
1955 * For SAM Task Attribute emulation for failed struct se_cmd
1956 */
1957 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1958 transport_complete_task_attr(cmd);
1959
1960 if (complete) {
1961 transport_direct_request_timeout(cmd);
1962 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
1963 }
1964
1965 switch (cmd->transport_error_status) {
1966 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
1967 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1968 break;
1969 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
1970 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
1971 break;
1972 case PYX_TRANSPORT_INVALID_CDB_FIELD:
1973 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1974 break;
1975 case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
1976 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1977 break;
1978 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
1979 if (!sc)
1980 transport_new_cmd_failure(cmd);
1981 /*
1982 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1983 * we force this session to fall back to session
1984 * recovery.
1985 */
e3d6f909
AG		 1986 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
1987 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
c66ac9db
NB		 1988
1989 goto check_stop;
1990 case PYX_TRANSPORT_LU_COMM_FAILURE:
1991 case PYX_TRANSPORT_ILLEGAL_REQUEST:
1992 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1993 break;
1994 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
1995 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
1996 break;
1997 case PYX_TRANSPORT_WRITE_PROTECTED:
1998 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
1999 break;
2000 case PYX_TRANSPORT_RESERVATION_CONFLICT:
2001 /*
2002 * No SENSE Data payload for this case, set SCSI Status
2003 * and queue the response to $FABRIC_MOD.
2004 *
2005 * Uses linux/include/scsi/scsi.h SAM status codes defs
2006 */
2007 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2008 /*
2009 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2010 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2011 * CONFLICT STATUS.
2012 *
2013 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2014 */
e3d6f909
AG		 2015 if (cmd->se_sess &&
2016 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2017 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 2018 cmd->orig_fe_lun, 0x2C,
2019 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2020
07bde79a
NB		 2021 ret = cmd->se_tfo->queue_status(cmd);
2022 if (ret == -EAGAIN)
2023 goto queue_full;
c66ac9db
NB		 2024 goto check_stop;
2025 case PYX_TRANSPORT_USE_SENSE_REASON:
2026 /*
2027 * struct se_cmd->scsi_sense_reason already set
2028 */
2029 break;
2030 default:
6708bb27 2031 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
a1d8b49a 2032 cmd->t_task_cdb[0],
c66ac9db
NB		 2033 cmd->transport_error_status);
2034 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
2035 break;
2036 }
16ab8e60
NB		 2037 /*
2038 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
2039 * make the call to transport_send_check_condition_and_sense()
2040 * directly. Otherwise expect the fabric to make the call to
2041 * transport_send_check_condition_and_sense() after handling
2042 * possible unsoliticied write data payloads.
2043 */
2044 if (!sc && !cmd->se_tfo->new_cmd_map)
c66ac9db 2045 transport_new_cmd_failure(cmd);
07bde79a
NB		 2046 else {
2047 ret = transport_send_check_condition_and_sense(cmd,
2048 cmd->scsi_sense_reason, 0);
2049 if (ret == -EAGAIN)
2050 goto queue_full;
2051 }
2052
c66ac9db
NB		 2053check_stop:
2054 transport_lun_remove_cmd(cmd);
6708bb27 2055 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 2056 ;
07bde79a
NB		 2057 return;
2058
2059queue_full:
2060 cmd->t_state = TRANSPORT_COMPLETE_OK;
2061 transport_handle_queue_full(cmd, cmd->se_dev, transport_complete_qf);
c66ac9db
NB		 2062}
2063
2064static void transport_direct_request_timeout(struct se_cmd *cmd)
2065{
2066 unsigned long flags;
2067
a1d8b49a 2068 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 2069 if (!atomic_read(&cmd->t_transport_timeout)) {
a1d8b49a 2070 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2071 return;
2072 }
a1d8b49a
AG		 2073 if (atomic_read(&cmd->t_task_cdbs_timeout_left)) {
2074 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2075 return;
2076 }
2077
a1d8b49a
AG		 2078 atomic_sub(atomic_read(&cmd->t_transport_timeout),
2079 &cmd->t_se_count);
2080 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2081}
2082
2083static void transport_generic_request_timeout(struct se_cmd *cmd)
2084{
2085 unsigned long flags;
2086
2087 /*
a1d8b49a 2088 * Reset cmd->t_se_count to allow transport_generic_remove()
c66ac9db
NB		 2089 * to allow last call to free memory resources.
2090 */
a1d8b49a
AG		 2091 spin_lock_irqsave(&cmd->t_state_lock, flags);
2092 if (atomic_read(&cmd->t_transport_timeout) > 1) {
2093 int tmp = (atomic_read(&cmd->t_transport_timeout) - 1);
c66ac9db 2094
a1d8b49a 2095 atomic_sub(tmp, &cmd->t_se_count);
c66ac9db 2096 }
a1d8b49a 2097 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2098
35462975 2099 transport_generic_remove(cmd, 0);
c66ac9db
NB		 2100}
2101
c66ac9db
NB		 2102static inline u32 transport_lba_21(unsigned char *cdb)
2103{
2104 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2105}
2106
2107static inline u32 transport_lba_32(unsigned char *cdb)
2108{
2109 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2110}
2111
2112static inline unsigned long long transport_lba_64(unsigned char *cdb)
2113{
2114 unsigned int __v1, __v2;
2115
2116 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2117 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2118
2119 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2120}
2121
2122/*
2123 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2124 */
2125static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2126{
2127 unsigned int __v1, __v2;
2128
2129 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2130 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2131
2132 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2133}
2134
2135static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2136{
2137 unsigned long flags;
2138
a1d8b49a 2139 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 2140 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 2141 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2142}
2143
2144/*
2145 * Called from interrupt context.
2146 */
2147static void transport_task_timeout_handler(unsigned long data)
2148{
2149 struct se_task *task = (struct se_task *)data;
e3d6f909 2150 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db
NB		 2151 unsigned long flags;
2152
6708bb27 2153 pr_debug("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
c66ac9db 2154
a1d8b49a 2155 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2156 if (task->task_flags & TF_STOP) {
a1d8b49a 2157 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2158 return;
2159 }
2160 task->task_flags &= ~TF_RUNNING;
2161
2162 /*
2163 * Determine if transport_complete_task() has already been called.
2164 */
6708bb27
AG		 2165 if (!atomic_read(&task->task_active)) {
2166 pr_debug("transport task: %p cmd: %p timeout task_active"
c66ac9db 2167 " == 0\n", task, cmd);
a1d8b49a 2168 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2169 return;
2170 }
2171
a1d8b49a
AG		 2172 atomic_inc(&cmd->t_se_count);
2173 atomic_inc(&cmd->t_transport_timeout);
2174 cmd->t_tasks_failed = 1;
c66ac9db
NB		 2175
2176 atomic_set(&task->task_timeout, 1);
2177 task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
2178 task->task_scsi_status = 1;
2179
2180 if (atomic_read(&task->task_stop)) {
6708bb27 2181 pr_debug("transport task: %p cmd: %p timeout task_stop"
c66ac9db 2182 " == 1\n", task, cmd);
a1d8b49a 2183 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2184 complete(&task->task_stop_comp);
2185 return;
2186 }
2187
6708bb27
AG		 2188 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
2189 pr_debug("transport task: %p cmd: %p timeout non zero"
c66ac9db 2190 " t_task_cdbs_left\n", task, cmd);
a1d8b49a 2191 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2192 return;
2193 }
6708bb27 2194 pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
c66ac9db
NB		 2195 task, cmd);
2196
2197 cmd->t_state = TRANSPORT_COMPLETE_FAILURE;
a1d8b49a 2198 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2199
2200 transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE);
2201}
2202
2203/*
a1d8b49a 2204 * Called with cmd->t_state_lock held.
c66ac9db
NB		 2205 */
2206static void transport_start_task_timer(struct se_task *task)
2207{
2208 struct se_device *dev = task->se_dev;
2209 int timeout;
2210
2211 if (task->task_flags & TF_RUNNING)
2212 return;
2213 /*
2214 * If the task_timeout is disabled, exit now.
2215 */
e3d6f909 2216 timeout = dev->se_sub_dev->se_dev_attrib.task_timeout;
6708bb27 2217 if (!timeout)
c66ac9db
NB		 2218 return;
2219
2220 init_timer(&task->task_timer);
2221 task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
2222 task->task_timer.data = (unsigned long) task;
2223 task->task_timer.function = transport_task_timeout_handler;
2224
2225 task->task_flags |= TF_RUNNING;
2226 add_timer(&task->task_timer);
2227#if 0
6708bb27 2228 pr_debug("Starting task timer for cmd: %p task: %p seconds:"
c66ac9db
NB		 2229 " %d\n", task->task_se_cmd, task, timeout);
2230#endif
2231}
2232
2233/*
a1d8b49a 2234 * Called with spin_lock_irq(&cmd->t_state_lock) held.
c66ac9db
NB		 2235 */
2236void __transport_stop_task_timer(struct se_task *task, unsigned long *flags)
2237{
e3d6f909 2238 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db 2239
6708bb27 2240 if (!task->task_flags & TF_RUNNING)
c66ac9db
NB		 2241 return;
2242
2243 task->task_flags |= TF_STOP;
a1d8b49a 2244 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
c66ac9db
NB		 2245
2246 del_timer_sync(&task->task_timer);
2247
a1d8b49a 2248 spin_lock_irqsave(&cmd->t_state_lock, *flags);
c66ac9db
NB		 2249 task->task_flags &= ~TF_RUNNING;
2250 task->task_flags &= ~TF_STOP;
2251}
2252
2253static void transport_stop_all_task_timers(struct se_cmd *cmd)
2254{
2255 struct se_task *task = NULL, *task_tmp;
2256 unsigned long flags;
2257
a1d8b49a 2258 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2259 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2260 &cmd->t_task_list, t_list)
c66ac9db 2261 __transport_stop_task_timer(task, &flags);
a1d8b49a 2262 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2263}
2264
2265static inline int transport_tcq_window_closed(struct se_device *dev)
2266{
2267 if (dev->dev_tcq_window_closed++ <
2268 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
2269 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
2270 } else
2271 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
2272
e3d6f909 2273 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 2274 return 0;
2275}
2276
2277/*
2278 * Called from Fabric Module context from transport_execute_tasks()
2279 *
2280 * The return of this function determins if the tasks from struct se_cmd
2281 * get added to the execution queue in transport_execute_tasks(),
2282 * or are added to the delayed or ordered lists here.
2283 */
2284static inline int transport_execute_task_attr(struct se_cmd *cmd)
2285{
5951146d 2286 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 2287 return 1;
2288 /*
25985edc 2289 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 2290 * to allow the passed struct se_cmd list of tasks to the front of the list.
2291 */
e66ecd50 2292 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
5951146d 2293 atomic_inc(&cmd->se_dev->dev_hoq_count);
c66ac9db 2294 smp_mb__after_atomic_inc();
6708bb27 2295 pr_debug("Added HEAD_OF_QUEUE for CDB:"
c66ac9db 2296 " 0x%02x, se_ordered_id: %u\n",
6708bb27 2297 cmd->t_task_cdb[0],
c66ac9db
NB		 2298 cmd->se_ordered_id);
2299 return 1;
e66ecd50 2300 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d
AG		 2301 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2302 list_add_tail(&cmd->se_ordered_node,
2303 &cmd->se_dev->ordered_cmd_list);
2304 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
c66ac9db 2305
5951146d 2306 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 2307 smp_mb__after_atomic_inc();
2308
6708bb27 2309 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 2310 " list, se_ordered_id: %u\n",
a1d8b49a 2311 cmd->t_task_cdb[0],
c66ac9db
NB		 2312 cmd->se_ordered_id);
2313 /*
2314 * Add ORDERED command to tail of execution queue if
2315 * no other older commands exist that need to be
2316 * completed first.
2317 */
6708bb27 2318 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 2319 return 1;
2320 } else {
2321 /*
2322 * For SIMPLE and UNTAGGED Task Attribute commands
2323 */
5951146d 2324 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 2325 smp_mb__after_atomic_inc();
2326 }
2327 /*
2328 * Otherwise if one or more outstanding ORDERED task attribute exist,
2329 * add the dormant task(s) built for the passed struct se_cmd to the
2330 * execution queue and become in Active state for this struct se_device.
2331 */
5951146d 2332 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 2333 /*
2334 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 2335 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 2336 */
5951146d 2337 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2338 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 2339 list_add_tail(&cmd->se_delayed_node,
2340 &cmd->se_dev->delayed_cmd_list);
2341 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2342
6708bb27 2343 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 2344 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 2345 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 2346 cmd->se_ordered_id);
2347 /*
2348 * Return zero to let transport_execute_tasks() know
2349 * not to add the delayed tasks to the execution list.
2350 */
2351 return 0;
2352 }
2353 /*
2354 * Otherwise, no ORDERED task attributes exist..
2355 */
2356 return 1;
2357}
2358
2359/*
2360 * Called from fabric module context in transport_generic_new_cmd() and
2361 * transport_generic_process_write()
2362 */
2363static int transport_execute_tasks(struct se_cmd *cmd)
2364{
2365 int add_tasks;
2366
db1620a2
CH		 2367 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2368 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
2369 transport_generic_request_failure(cmd, NULL, 0, 1);
2370 return 0;
c66ac9db 2371 }
db1620a2 2372
c66ac9db
NB		 2373 /*
2374 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2375 * has occurred that prevents execution.
c66ac9db 2376 */
6708bb27 2377 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 2378 /*
2379 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2380 * attribute for the tasks of the received struct se_cmd CDB
2381 */
2382 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2383 if (!add_tasks)
c66ac9db
NB		 2384 goto execute_tasks;
2385 /*
2386 * This calls transport_add_tasks_from_cmd() to handle
2387 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2388 * (if enabled) in __transport_add_task_to_execute_queue() and
2389 * transport_add_task_check_sam_attr().
2390 */
2391 transport_add_tasks_from_cmd(cmd);
2392 }
2393 /*
2394 * Kick the execution queue for the cmd associated struct se_device
2395 * storage object.
2396 */
2397execute_tasks:
5951146d 2398 __transport_execute_tasks(cmd->se_dev);
c66ac9db
NB		 2399 return 0;
2400}
2401
2402/*
2403 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2404 * from struct se_device->execute_task_list and
2405 *
2406 * Called from transport_processing_thread()
2407 */
2408static int __transport_execute_tasks(struct se_device *dev)
2409{
2410 int error;
2411 struct se_cmd *cmd = NULL;
e3d6f909 2412 struct se_task *task = NULL;
c66ac9db
NB		 2413 unsigned long flags;
2414
2415 /*
2416 * Check if there is enough room in the device and HBA queue to send
a1d8b49a 2417 * struct se_tasks to the selected transport.
c66ac9db
NB		 2418 */
2419check_depth:
e3d6f909 2420 if (!atomic_read(&dev->depth_left))
c66ac9db 2421 return transport_tcq_window_closed(dev);
c66ac9db 2422
e3d6f909 2423 dev->dev_tcq_window_closed = 0;
c66ac9db 2424
e3d6f909
AG		 2425 spin_lock_irq(&dev->execute_task_lock);
2426 if (list_empty(&dev->execute_task_list)) {
2427 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2428 return 0;
2429 }
e3d6f909
AG		 2430 task = list_first_entry(&dev->execute_task_list,
2431 struct se_task, t_execute_list);
2432 list_del(&task->t_execute_list);
2433 atomic_set(&task->task_execute_queue, 0);
2434 atomic_dec(&dev->execute_tasks);
2435 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2436
2437 atomic_dec(&dev->depth_left);
c66ac9db 2438
e3d6f909 2439 cmd = task->task_se_cmd;
c66ac9db 2440
a1d8b49a 2441 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 2442 atomic_set(&task->task_active, 1);
2443 atomic_set(&task->task_sent, 1);
a1d8b49a 2444 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2445
a1d8b49a
AG		 2446 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2447 cmd->t_task_list_num)
c66ac9db
NB		 2448 atomic_set(&cmd->transport_sent, 1);
2449
2450 transport_start_task_timer(task);
a1d8b49a 2451 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2452 /*
2453 * The struct se_cmd->transport_emulate_cdb() function pointer is used
e3d6f909 2454 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
c66ac9db
NB		 2455 * struct se_subsystem_api->do_task() caller below.
2456 */
2457 if (cmd->transport_emulate_cdb) {
2458 error = cmd->transport_emulate_cdb(cmd);
2459 if (error != 0) {
2460 cmd->transport_error_status = error;
2461 atomic_set(&task->task_active, 0);
2462 atomic_set(&cmd->transport_sent, 0);
2463 transport_stop_tasks_for_cmd(cmd);
2464 transport_generic_request_failure(cmd, dev, 0, 1);
2465 goto check_depth;
2466 }
2467 /*
2468 * Handle the successful completion for transport_emulate_cdb()
2469 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2470 * Otherwise the caller is expected to complete the task with
2471 * proper status.
2472 */
2473 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2474 cmd->scsi_status = SAM_STAT_GOOD;
2475 task->task_scsi_status = GOOD;
2476 transport_complete_task(task, 1);
2477 }
2478 } else {
2479 /*
2480 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2481 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2482 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2483 * LUN emulation code.
2484 *
2485 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2486 * call ->do_task() directly and let the underlying TCM subsystem plugin
2487 * code handle the CDB emulation.
2488 */
e3d6f909
AG		 2489 if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2490 (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
c66ac9db
NB		 2491 error = transport_emulate_control_cdb(task);
2492 else
e3d6f909 2493 error = dev->transport->do_task(task);
c66ac9db
NB		 2494
2495 if (error != 0) {
2496 cmd->transport_error_status = error;
2497 atomic_set(&task->task_active, 0);
2498 atomic_set(&cmd->transport_sent, 0);
2499 transport_stop_tasks_for_cmd(cmd);
2500 transport_generic_request_failure(cmd, dev, 0, 1);
2501 }
2502 }
2503
2504 goto check_depth;
2505
2506 return 0;
2507}
2508
2509void transport_new_cmd_failure(struct se_cmd *se_cmd)
2510{
2511 unsigned long flags;
2512 /*
2513 * Any unsolicited data will get dumped for failed command inside of
2514 * the fabric plugin
2515 */
a1d8b49a 2516 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2517 se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2518 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
a1d8b49a 2519 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2520}
2521
2522static void transport_nop_wait_for_tasks(struct se_cmd *, int, int);
2523
2524static inline u32 transport_get_sectors_6(
2525 unsigned char *cdb,
2526 struct se_cmd *cmd,
2527 int *ret)
2528{
5951146d 2529 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2530
2531 /*
2532 * Assume TYPE_DISK for non struct se_device objects.
2533 * Use 8-bit sector value.
2534 */
2535 if (!dev)
2536 goto type_disk;
2537
2538 /*
2539 * Use 24-bit allocation length for TYPE_TAPE.
2540 */
e3d6f909 2541 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2542 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2543
2544 /*
2545 * Everything else assume TYPE_DISK Sector CDB location.
2546 * Use 8-bit sector value.
2547 */
2548type_disk:
2549 return (u32)cdb[4];
2550}
2551
2552static inline u32 transport_get_sectors_10(
2553 unsigned char *cdb,
2554 struct se_cmd *cmd,
2555 int *ret)
2556{
5951146d 2557 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2558
2559 /*
2560 * Assume TYPE_DISK for non struct se_device objects.
2561 * Use 16-bit sector value.
2562 */
2563 if (!dev)
2564 goto type_disk;
2565
2566 /*
2567 * XXX_10 is not defined in SSC, throw an exception
2568 */
e3d6f909
AG		 2569 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2570 *ret = -EINVAL;
c66ac9db
NB		 2571 return 0;
2572 }
2573
2574 /*
2575 * Everything else assume TYPE_DISK Sector CDB location.
2576 * Use 16-bit sector value.
2577 */
2578type_disk:
2579 return (u32)(cdb[7] << 8) + cdb[8];
2580}
2581
2582static inline u32 transport_get_sectors_12(
2583 unsigned char *cdb,
2584 struct se_cmd *cmd,
2585 int *ret)
2586{
5951146d 2587 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2588
2589 /*
2590 * Assume TYPE_DISK for non struct se_device objects.
2591 * Use 32-bit sector value.
2592 */
2593 if (!dev)
2594 goto type_disk;
2595
2596 /*
2597 * XXX_12 is not defined in SSC, throw an exception
2598 */
e3d6f909
AG		 2599 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2600 *ret = -EINVAL;
c66ac9db
NB		 2601 return 0;
2602 }
2603
2604 /*
2605 * Everything else assume TYPE_DISK Sector CDB location.
2606 * Use 32-bit sector value.
2607 */
2608type_disk:
2609 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2610}
2611
2612static inline u32 transport_get_sectors_16(
2613 unsigned char *cdb,
2614 struct se_cmd *cmd,
2615 int *ret)
2616{
5951146d 2617 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2618
2619 /*
2620 * Assume TYPE_DISK for non struct se_device objects.
2621 * Use 32-bit sector value.
2622 */
2623 if (!dev)
2624 goto type_disk;
2625
2626 /*
2627 * Use 24-bit allocation length for TYPE_TAPE.
2628 */
e3d6f909 2629 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2630 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2631
2632type_disk:
2633 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2634 (cdb[12] << 8) + cdb[13];
2635}
2636
2637/*
2638 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2639 */
2640static inline u32 transport_get_sectors_32(
2641 unsigned char *cdb,
2642 struct se_cmd *cmd,
2643 int *ret)
2644{
2645 /*
2646 * Assume TYPE_DISK for non struct se_device objects.
2647 * Use 32-bit sector value.
2648 */
2649 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2650 (cdb[30] << 8) + cdb[31];
2651
2652}
2653
2654static inline u32 transport_get_size(
2655 u32 sectors,
2656 unsigned char *cdb,
2657 struct se_cmd *cmd)
2658{
5951146d 2659 struct se_device *dev = cmd->se_dev;
c66ac9db 2660
e3d6f909 2661 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2662 if (cdb[1] & 1) { /* sectors */
e3d6f909 2663 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2664 } else /* bytes */
2665 return sectors;
2666 }
2667#if 0
6708bb27 2668 pr_debug("Returning block_size: %u, sectors: %u == %u for"
e3d6f909
AG		 2669 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2670 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2671 dev->transport->name);
c66ac9db 2672#endif
e3d6f909 2673 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2674}
2675
c66ac9db
NB		 2676static void transport_xor_callback(struct se_cmd *cmd)
2677{
2678 unsigned char *buf, *addr;
ec98f782 2679 struct scatterlist *sg;
c66ac9db
NB		 2680 unsigned int offset;
2681 int i;
ec98f782 2682 int count;
c66ac9db
NB		 2683 /*
2684 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2685 *
2686 * 1) read the specified logical block(s);
2687 * 2) transfer logical blocks from the data-out buffer;
2688 * 3) XOR the logical blocks transferred from the data-out buffer with
2689 * the logical blocks read, storing the resulting XOR data in a buffer;
2690 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2691 * blocks transferred from the data-out buffer; and
2692 * 5) transfer the resulting XOR data to the data-in buffer.
2693 */
2694 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2695 if (!buf) {
2696 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2697 return;
2698 }
2699 /*
ec98f782 2700 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2701 * into the locally allocated *buf
2702 */
ec98f782
AG		 2703 sg_copy_to_buffer(cmd->t_data_sg,
2704 cmd->t_data_nents,
2705 buf,
2706 cmd->data_length);
2707
c66ac9db
NB		 2708 /*
2709 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2710 * cmd->t_mem_bidi_list
c66ac9db
NB		 2711 */
2712
2713 offset = 0;
ec98f782
AG		 2714 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2715 addr = kmap_atomic(sg_page(sg), KM_USER0);
2716 if (!addr)
c66ac9db
NB		 2717 goto out;
2718
ec98f782
AG		 2719 for (i = 0; i < sg->length; i++)
2720 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2721
ec98f782 2722 offset += sg->length;
c66ac9db
NB		 2723 kunmap_atomic(addr, KM_USER0);
2724 }
ec98f782 2725
c66ac9db
NB		 2726out:
2727 kfree(buf);
2728}
2729
2730/*
2731 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2732 */
2733static int transport_get_sense_data(struct se_cmd *cmd)
2734{
2735 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2736 struct se_device *dev;
2737 struct se_task *task = NULL, *task_tmp;
2738 unsigned long flags;
2739 u32 offset = 0;
2740
e3d6f909
AG		 2741 WARN_ON(!cmd->se_lun);
2742
a1d8b49a 2743 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2744 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2745 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2746 return 0;
2747 }
2748
2749 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2750 &cmd->t_task_list, t_list) {
c66ac9db
NB		 2751
2752 if (!task->task_sense)
2753 continue;
2754
2755 dev = task->se_dev;
6708bb27 2756 if (!dev)
c66ac9db
NB		 2757 continue;
2758
e3d6f909 2759 if (!dev->transport->get_sense_buffer) {
6708bb27 2760 pr_err("dev->transport->get_sense_buffer"
c66ac9db
NB		 2761 " is NULL\n");
2762 continue;
2763 }
2764
e3d6f909 2765 sense_buffer = dev->transport->get_sense_buffer(task);
6708bb27
AG		 2766 if (!sense_buffer) {
2767 pr_err("ITT[0x%08x]_TASK[%d]: Unable to locate"
c66ac9db 2768 " sense buffer for task with sense\n",
e3d6f909 2769 cmd->se_tfo->get_task_tag(cmd), task->task_no);
c66ac9db
NB		 2770 continue;
2771 }
a1d8b49a 2772 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2773
e3d6f909 2774 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2775 TRANSPORT_SENSE_BUFFER);
2776
5951146d 2777 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2778 TRANSPORT_SENSE_BUFFER);
2779 cmd->scsi_status = task->task_scsi_status;
2780 /* Automatically padded */
2781 cmd->scsi_sense_length =
2782 (TRANSPORT_SENSE_BUFFER + offset);
2783
6708bb27 2784 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
c66ac9db 2785 " and sense\n",
e3d6f909 2786 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2787 cmd->scsi_status);
2788 return 0;
2789 }
a1d8b49a 2790 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2791
2792 return -1;
2793}
2794
c66ac9db
NB		 2795static int
2796transport_handle_reservation_conflict(struct se_cmd *cmd)
2797{
2798 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
2799 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2800 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2801 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2802 /*
2803 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2804 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2805 * CONFLICT STATUS.
2806 *
2807 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2808 */
e3d6f909
AG		 2809 if (cmd->se_sess &&
2810 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2811 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 2812 cmd->orig_fe_lun, 0x2C,
2813 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
5951146d 2814 return -EINVAL;
c66ac9db
NB		 2815}
2816
ec98f782
AG		 2817static inline long long transport_dev_end_lba(struct se_device *dev)
2818{
2819 return dev->transport->get_blocks(dev) + 1;
2820}
2821
2822static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2823{
2824 struct se_device *dev = cmd->se_dev;
2825 u32 sectors;
2826
2827 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2828 return 0;
2829
2830 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2831
6708bb27
AG		 2832 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2833 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2834 " transport_dev_end_lba(): %llu\n",
2835 cmd->t_task_lba, sectors,
2836 transport_dev_end_lba(dev));
7abbe7f3 2837 return -EINVAL;
ec98f782
AG		 2838 }
2839
7abbe7f3 2840 return 0;
ec98f782
AG		 2841}
2842
706d5860
NB		 2843static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2844{
2845 /*
2846 * Determine if the received WRITE_SAME is used to for direct
2847 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2848 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2849 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2850 */
2851 int passthrough = (dev->transport->transport_type ==
2852 TRANSPORT_PLUGIN_PHBA_PDEV);
2853
2854 if (!passthrough) {
2855 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2856 pr_err("WRITE_SAME PBDATA and LBDATA"
2857 " bits not supported for Block Discard"
2858 " Emulation\n");
2859 return -ENOSYS;
2860 }
2861 /*
2862 * Currently for the emulated case we only accept
2863 * tpws with the UNMAP=1 bit set.
2864 */
2865 if (!(flags[0] & 0x08)) {
2866 pr_err("WRITE_SAME w/o UNMAP bit not"
2867 " supported for Block Discard Emulation\n");
2868 return -ENOSYS;
2869 }
2870 }
2871
2872 return 0;
2873}
2874
c66ac9db
NB		 2875/* transport_generic_cmd_sequencer():
2876 *
2877 * Generic Command Sequencer that should work for most DAS transport
2878 * drivers.
2879 *
2880 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2881 * RX Thread.
2882 *
2883 * FIXME: Need to support other SCSI OPCODES where as well.
2884 */
2885static int transport_generic_cmd_sequencer(
2886 struct se_cmd *cmd,
2887 unsigned char *cdb)
2888{
5951146d 2889 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2890 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2891 int ret = 0, sector_ret = 0, passthrough;
2892 u32 sectors = 0, size = 0, pr_reg_type = 0;
2893 u16 service_action;
2894 u8 alua_ascq = 0;
2895 /*
2896 * Check for an existing UNIT ATTENTION condition
2897 */
2898 if (core_scsi3_ua_check(cmd, cdb) < 0) {
2899 cmd->transport_wait_for_tasks =
2900 &transport_nop_wait_for_tasks;
2901 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2902 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2903 return -EINVAL;
c66ac9db
NB		 2904 }
2905 /*
2906 * Check status of Asymmetric Logical Unit Assignment port
2907 */
e3d6f909 2908 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db
NB		 2909 if (ret != 0) {
2910 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
2911 /*
25985edc 2912 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2913 * The ALUA additional sense code qualifier (ASCQ) is determined
2914 * by the ALUA primary or secondary access state..
2915 */
2916 if (ret > 0) {
2917#if 0
6708bb27 2918 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2919 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2920 cmd->se_tfo->get_fabric_name(), alua_ascq);
c66ac9db
NB		 2921#endif
2922 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2923 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2924 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2925 return -EINVAL;
c66ac9db
NB		 2926 }
2927 goto out_invalid_cdb_field;
2928 }
2929 /*
2930 * Check status for SPC-3 Persistent Reservations
2931 */
e3d6f909
AG		 2932 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2933 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
c66ac9db
NB		 2934 cmd, cdb, pr_reg_type) != 0)
2935 return transport_handle_reservation_conflict(cmd);
2936 /*
2937 * This means the CDB is allowed for the SCSI Initiator port
2938 * when said port is *NOT* holding the legacy SPC-2 or
2939 * SPC-3 Persistent Reservation.
2940 */
2941 }
2942
2943 switch (cdb[0]) {
2944 case READ_6:
2945 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2946 if (sector_ret)
2947 goto out_unsupported_cdb;
2948 size = transport_get_size(sectors, cdb, cmd);
2949 cmd->transport_split_cdb = &split_cdb_XX_6;
a1d8b49a 2950 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2951 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2952 break;
2953 case READ_10:
2954 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2955 if (sector_ret)
2956 goto out_unsupported_cdb;
2957 size = transport_get_size(sectors, cdb, cmd);
2958 cmd->transport_split_cdb = &split_cdb_XX_10;
a1d8b49a 2959 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2960 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2961 break;
2962 case READ_12:
2963 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2964 if (sector_ret)
2965 goto out_unsupported_cdb;
2966 size = transport_get_size(sectors, cdb, cmd);
2967 cmd->transport_split_cdb = &split_cdb_XX_12;
a1d8b49a 2968 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2969 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2970 break;
2971 case READ_16:
2972 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2973 if (sector_ret)
2974 goto out_unsupported_cdb;
2975 size = transport_get_size(sectors, cdb, cmd);
2976 cmd->transport_split_cdb = &split_cdb_XX_16;
a1d8b49a 2977 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2978 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2979 break;
2980 case WRITE_6:
2981 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2982 if (sector_ret)
2983 goto out_unsupported_cdb;
2984 size = transport_get_size(sectors, cdb, cmd);
2985 cmd->transport_split_cdb = &split_cdb_XX_6;
a1d8b49a 2986 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2987 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2988 break;
2989 case WRITE_10:
2990 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2991 if (sector_ret)
2992 goto out_unsupported_cdb;
2993 size = transport_get_size(sectors, cdb, cmd);
2994 cmd->transport_split_cdb = &split_cdb_XX_10;
a1d8b49a
AG		 2995 cmd->t_task_lba = transport_lba_32(cdb);
2996 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2997 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2998 break;
2999 case WRITE_12:
3000 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
3001 if (sector_ret)
3002 goto out_unsupported_cdb;
3003 size = transport_get_size(sectors, cdb, cmd);
3004 cmd->transport_split_cdb = &split_cdb_XX_12;
a1d8b49a
AG		 3005 cmd->t_task_lba = transport_lba_32(cdb);
3006 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 3007 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3008 break;
3009 case WRITE_16:
3010 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3011 if (sector_ret)
3012 goto out_unsupported_cdb;
3013 size = transport_get_size(sectors, cdb, cmd);
3014 cmd->transport_split_cdb = &split_cdb_XX_16;
a1d8b49a
AG		 3015 cmd->t_task_lba = transport_lba_64(cdb);
3016 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 3017 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3018 break;
3019 case XDWRITEREAD_10:
3020 if ((cmd->data_direction != DMA_TO_DEVICE) ||
a1d8b49a 3021 !(cmd->t_tasks_bidi))
c66ac9db
NB		 3022 goto out_invalid_cdb_field;
3023 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3024 if (sector_ret)
3025 goto out_unsupported_cdb;
3026 size = transport_get_size(sectors, cdb, cmd);
3027 cmd->transport_split_cdb = &split_cdb_XX_10;
a1d8b49a 3028 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 3029 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
e3d6f909 3030 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 3031 TRANSPORT_PLUGIN_PHBA_PDEV);
3032 /*
3033 * Skip the remaining assignments for TCM/PSCSI passthrough
3034 */
3035 if (passthrough)
3036 break;
3037 /*
3038 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
3039 */
3040 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 3041 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 3042 break;
3043 case VARIABLE_LENGTH_CMD:
3044 service_action = get_unaligned_be16(&cdb[8]);
3045 /*
3046 * Determine if this is TCM/PSCSI device and we should disable
3047 * internal emulation for this CDB.
3048 */
e3d6f909 3049 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 3050 TRANSPORT_PLUGIN_PHBA_PDEV);
3051
3052 switch (service_action) {
3053 case XDWRITEREAD_32:
3054 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
3055 if (sector_ret)
3056 goto out_unsupported_cdb;
3057 size = transport_get_size(sectors, cdb, cmd);
3058 /*
3059 * Use WRITE_32 and READ_32 opcodes for the emulated
3060 * XDWRITE_READ_32 logic.
3061 */
3062 cmd->transport_split_cdb = &split_cdb_XX_32;
a1d8b49a 3063 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 3064 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3065
3066 /*
3067 * Skip the remaining assignments for TCM/PSCSI passthrough
3068 */
3069 if (passthrough)
3070 break;
3071
3072 /*
3073 * Setup BIDI XOR callback to be run during
3074 * transport_generic_complete_ok()
3075 */
3076 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 3077 cmd->t_tasks_fua = (cdb[10] & 0x8);
c66ac9db
NB		 3078 break;
3079 case WRITE_SAME_32:
3080 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
3081 if (sector_ret)
3082 goto out_unsupported_cdb;
dd3a5ad8 3083
6708bb27 3084 if (sectors)
12850626 3085 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 3086 else {
3087 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
3088 " supported\n");
3089 goto out_invalid_cdb_field;
3090 }
dd3a5ad8 3091
a1d8b49a 3092 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 3093 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3094
706d5860 3095 if (target_check_write_same_discard(&cdb[10], dev) < 0)
c66ac9db 3096 goto out_invalid_cdb_field;
706d5860 3097
c66ac9db
NB		 3098 break;
3099 default:
6708bb27 3100 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 3101 " 0x%04x not supported\n", service_action);
3102 goto out_unsupported_cdb;
3103 }
3104 break;
e434f1f1 3105 case MAINTENANCE_IN:
e3d6f909 3106 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 3107 /* MAINTENANCE_IN from SCC-2 */
3108 /*
3109 * Check for emulated MI_REPORT_TARGET_PGS.
3110 */
3111 if (cdb[1] == MI_REPORT_TARGET_PGS) {
3112 cmd->transport_emulate_cdb =
e3d6f909 3113 (su_dev->t10_alua.alua_type ==
c66ac9db 3114 SPC3_ALUA_EMULATED) ?
e3d6f909 3115 core_emulate_report_target_port_groups :
c66ac9db
NB		 3116 NULL;
3117 }
3118 size = (cdb[6] << 24) | (cdb[7] << 16) |
3119 (cdb[8] << 8) | cdb[9];
3120 } else {
3121 /* GPCMD_SEND_KEY from multi media commands */
3122 size = (cdb[8] << 8) + cdb[9];
3123 }
05d1c7c0 3124 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3125 break;
3126 case MODE_SELECT:
3127 size = cdb[4];
3128 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3129 break;
3130 case MODE_SELECT_10:
3131 size = (cdb[7] << 8) + cdb[8];
3132 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3133 break;
3134 case MODE_SENSE:
3135 size = cdb[4];
05d1c7c0 3136 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3137 break;
3138 case MODE_SENSE_10:
3139 case GPCMD_READ_BUFFER_CAPACITY:
3140 case GPCMD_SEND_OPC:
3141 case LOG_SELECT:
3142 case LOG_SENSE:
3143 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 3144 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3145 break;
3146 case READ_BLOCK_LIMITS:
3147 size = READ_BLOCK_LEN;
05d1c7c0 3148 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3149 break;
3150 case GPCMD_GET_CONFIGURATION:
3151 case GPCMD_READ_FORMAT_CAPACITIES:
3152 case GPCMD_READ_DISC_INFO:
3153 case GPCMD_READ_TRACK_RZONE_INFO:
3154 size = (cdb[7] << 8) + cdb[8];
3155 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3156 break;
3157 case PERSISTENT_RESERVE_IN:
3158 case PERSISTENT_RESERVE_OUT:
3159 cmd->transport_emulate_cdb =
e3d6f909 3160 (su_dev->t10_pr.res_type ==
c66ac9db 3161 SPC3_PERSISTENT_RESERVATIONS) ?
e3d6f909 3162 core_scsi3_emulate_pr : NULL;
c66ac9db 3163 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 3164 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3165 break;
3166 case GPCMD_MECHANISM_STATUS:
3167 case GPCMD_READ_DVD_STRUCTURE:
3168 size = (cdb[8] << 8) + cdb[9];
3169 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3170 break;
3171 case READ_POSITION:
3172 size = READ_POSITION_LEN;
05d1c7c0 3173 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 3174 break;
e434f1f1 3175 case MAINTENANCE_OUT:
e3d6f909 3176 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 3177 /* MAINTENANCE_OUT from SCC-2
3178 *
3179 * Check for emulated MO_SET_TARGET_PGS.
3180 */
3181 if (cdb[1] == MO_SET_TARGET_PGS) {
3182 cmd->transport_emulate_cdb =
e3d6f909 3183 (su_dev->t10_alua.alua_type ==
c66ac9db 3184 SPC3_ALUA_EMULATED) ?
e3d6f909 3185 core_emulate_set_target_port_groups :
c66ac9db
NB		 3186 NULL;
3187 }
3188
3189 size = (cdb[6] << 24) | (cdb[7] << 16) |
3190 (cdb[8] << 8) | cdb[9];
3191 } else {
3192 /* GPCMD_REPORT_KEY from multi media commands */
3193 size = (cdb[8] << 8) + cdb[9];
3194 }
05d1c7c0 3195 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3196 break;
3197 case INQUIRY:
3198 size = (cdb[3] << 8) + cdb[4];
3199 /*
3200 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3201 * See spc4r17 section 5.3
3202 */
5951146d 3203 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3204 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3205 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3206 break;
3207 case READ_BUFFER:
3208 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 3209 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3210 break;
3211 case READ_CAPACITY:
3212 size = READ_CAP_LEN;
05d1c7c0 3213 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3214 break;
3215 case READ_MEDIA_SERIAL_NUMBER:
3216 case SECURITY_PROTOCOL_IN:
3217 case SECURITY_PROTOCOL_OUT:
3218 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 3219 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3220 break;
3221 case SERVICE_ACTION_IN:
3222 case ACCESS_CONTROL_IN:
3223 case ACCESS_CONTROL_OUT:
3224 case EXTENDED_COPY:
3225 case READ_ATTRIBUTE:
3226 case RECEIVE_COPY_RESULTS:
3227 case WRITE_ATTRIBUTE:
3228 size = (cdb[10] << 24) | (cdb[11] << 16) |
3229 (cdb[12] << 8) | cdb[13];
05d1c7c0 3230 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3231 break;
3232 case RECEIVE_DIAGNOSTIC:
3233 case SEND_DIAGNOSTIC:
3234 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 3235 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3236 break;
3237/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3238#if 0
3239 case GPCMD_READ_CD:
3240 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3241 size = (2336 * sectors);
05d1c7c0 3242 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3243 break;
3244#endif
3245 case READ_TOC:
3246 size = cdb[8];
05d1c7c0 3247 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3248 break;
3249 case REQUEST_SENSE:
3250 size = cdb[4];
05d1c7c0 3251 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3252 break;
3253 case READ_ELEMENT_STATUS:
3254 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 3255 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3256 break;
3257 case WRITE_BUFFER:
3258 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 3259 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3260 break;
3261 case RESERVE:
3262 case RESERVE_10:
3263 /*
3264 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3265 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3266 */
3267 if (cdb[0] == RESERVE_10)
3268 size = (cdb[7] << 8) | cdb[8];
3269 else
3270 size = cmd->data_length;
3271
3272 /*
3273 * Setup the legacy emulated handler for SPC-2 and
3274 * >= SPC-3 compatible reservation handling (CRH=1)
3275 * Otherwise, we assume the underlying SCSI logic is
3276 * is running in SPC_PASSTHROUGH, and wants reservations
3277 * emulation disabled.
3278 */
3279 cmd->transport_emulate_cdb =
e3d6f909 3280 (su_dev->t10_pr.res_type !=
c66ac9db 3281 SPC_PASSTHROUGH) ?
e3d6f909 3282 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 3283 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3284 break;
3285 case RELEASE:
3286 case RELEASE_10:
3287 /*
3288 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3289 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3290 */
3291 if (cdb[0] == RELEASE_10)
3292 size = (cdb[7] << 8) | cdb[8];
3293 else
3294 size = cmd->data_length;
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 SYNCHRONIZE_CACHE:
3303 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3304 /*
3305 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3306 */
3307 if (cdb[0] == SYNCHRONIZE_CACHE) {
3308 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 3309 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 3310 } else {
3311 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 3312 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 3313 }
3314 if (sector_ret)
3315 goto out_unsupported_cdb;
3316
3317 size = transport_get_size(sectors, cdb, cmd);
3318 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3319
3320 /*
3321 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3322 */
e3d6f909 3323 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 3324 break;
3325 /*
3326 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3327 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3328 */
3329 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3330 /*
3331 * Check to ensure that LBA + Range does not exceed past end of
7abbe7f3 3332 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
c66ac9db 3333 */
7abbe7f3
NB		 3334 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
3335 if (transport_cmd_get_valid_sectors(cmd) < 0)
3336 goto out_invalid_cdb_field;
3337 }
c66ac9db
NB		 3338 break;
3339 case UNMAP:
3340 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 3341 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3342 break;
3343 case WRITE_SAME_16:
3344 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3345 if (sector_ret)
3346 goto out_unsupported_cdb;
dd3a5ad8 3347
6708bb27 3348 if (sectors)
12850626 3349 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 3350 else {
3351 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3352 goto out_invalid_cdb_field;
3353 }
dd3a5ad8 3354
5db0753b 3355 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
706d5860
NB		 3356 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3357
3358 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3359 goto out_invalid_cdb_field;
3360 break;
3361 case WRITE_SAME:
3362 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3363 if (sector_ret)
3364 goto out_unsupported_cdb;
3365
3366 if (sectors)
12850626 3367 size = transport_get_size(1, cdb, cmd);
706d5860
NB		 3368 else {
3369 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3370 goto out_invalid_cdb_field;
c66ac9db 3371 }
706d5860
NB		 3372
3373 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
c66ac9db 3374 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
706d5860
NB		 3375 /*
3376 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3377 * of byte 1 bit 3 UNMAP instead of original reserved field
3378 */
3379 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3380 goto out_invalid_cdb_field;
c66ac9db
NB		 3381 break;
3382 case ALLOW_MEDIUM_REMOVAL:
3383 case GPCMD_CLOSE_TRACK:
3384 case ERASE:
3385 case INITIALIZE_ELEMENT_STATUS:
3386 case GPCMD_LOAD_UNLOAD:
3387 case REZERO_UNIT:
3388 case SEEK_10:
3389 case GPCMD_SET_SPEED:
3390 case SPACE:
3391 case START_STOP:
3392 case TEST_UNIT_READY:
3393 case VERIFY:
3394 case WRITE_FILEMARKS:
3395 case MOVE_MEDIUM:
3396 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3397 break;
3398 case REPORT_LUNS:
3399 cmd->transport_emulate_cdb =
e3d6f909 3400 transport_core_report_lun_response;
c66ac9db
NB		 3401 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3402 /*
3403 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3404 * See spc4r17 section 5.3
3405 */
5951146d 3406 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3407 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3408 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3409 break;
3410 default:
6708bb27 3411 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 3412 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3413 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3414 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
3415 goto out_unsupported_cdb;
3416 }
3417
3418 if (size != cmd->data_length) {
6708bb27 3419 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 3420 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3421 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3422 cmd->data_length, size, cdb[0]);
3423
3424 cmd->cmd_spdtl = size;
3425
3426 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 3427 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 3428 " WRITE data\n");
3429 goto out_invalid_cdb_field;
3430 }
3431 /*
3432 * Reject READ_* or WRITE_* with overflow/underflow for
3433 * type SCF_SCSI_DATA_SG_IO_CDB.
3434 */
6708bb27
AG		 3435 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3436 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 3437 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3438 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3439 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3440 goto out_invalid_cdb_field;
3441 }
3442
3443 if (size > cmd->data_length) {
3444 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3445 cmd->residual_count = (size - cmd->data_length);
3446 } else {
3447 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3448 cmd->residual_count = (cmd->data_length - size);
3449 }
3450 cmd->data_length = size;
3451 }
3452
d0229ae3
AG		 3453 /* Let's limit control cdbs to a page, for simplicity's sake. */
3454 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3455 size > PAGE_SIZE)
3456 goto out_invalid_cdb_field;
3457
c66ac9db
NB		 3458 transport_set_supported_SAM_opcode(cmd);
3459 return ret;
3460
3461out_unsupported_cdb:
3462 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3463 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3464 return -EINVAL;
c66ac9db
NB		 3465out_invalid_cdb_field:
3466 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3467 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3468 return -EINVAL;
c66ac9db
NB		 3469}
3470
c66ac9db
NB		 3471/*
3472 * Called from transport_generic_complete_ok() and
3473 * transport_generic_request_failure() to determine which dormant/delayed
3474 * and ordered cmds need to have their tasks added to the execution queue.
3475 */
3476static void transport_complete_task_attr(struct se_cmd *cmd)
3477{
5951146d 3478 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3479 struct se_cmd *cmd_p, *cmd_tmp;
3480 int new_active_tasks = 0;
3481
e66ecd50 3482 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3483 atomic_dec(&dev->simple_cmds);
3484 smp_mb__after_atomic_dec();
3485 dev->dev_cur_ordered_id++;
6708bb27 3486 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3487 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3488 cmd->se_ordered_id);
e66ecd50 3489 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 3490 atomic_dec(&dev->dev_hoq_count);
3491 smp_mb__after_atomic_dec();
3492 dev->dev_cur_ordered_id++;
6708bb27 3493 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3494 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3495 cmd->se_ordered_id);
e66ecd50 3496 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db 3497 spin_lock(&dev->ordered_cmd_lock);
5951146d 3498 list_del(&cmd->se_ordered_node);
c66ac9db
NB		 3499 atomic_dec(&dev->dev_ordered_sync);
3500 smp_mb__after_atomic_dec();
3501 spin_unlock(&dev->ordered_cmd_lock);
3502
3503 dev->dev_cur_ordered_id++;
6708bb27 3504 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3505 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3506 }
3507 /*
3508 * Process all commands up to the last received
3509 * ORDERED task attribute which requires another blocking
3510 * boundary
3511 */
3512 spin_lock(&dev->delayed_cmd_lock);
3513 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3514 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3515
5951146d 3516 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3517 spin_unlock(&dev->delayed_cmd_lock);
3518
6708bb27 3519 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3520 " cmd_p: 0x%02x Task Attr: 0x%02x"
3521 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3522 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3523 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3524
3525 transport_add_tasks_from_cmd(cmd_p);
3526 new_active_tasks++;
3527
3528 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3529 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3530 break;
3531 }
3532 spin_unlock(&dev->delayed_cmd_lock);
3533 /*
3534 * If new tasks have become active, wake up the transport thread
3535 * to do the processing of the Active tasks.
3536 */
3537 if (new_active_tasks != 0)
e3d6f909 3538 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3539}
3540
07bde79a
NB		 3541static int transport_complete_qf(struct se_cmd *cmd)
3542{
3543 int ret = 0;
3544
3545 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
3546 return cmd->se_tfo->queue_status(cmd);
3547
3548 switch (cmd->data_direction) {
3549 case DMA_FROM_DEVICE:
3550 ret = cmd->se_tfo->queue_data_in(cmd);
3551 break;
3552 case DMA_TO_DEVICE:
ec98f782 3553 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3554 ret = cmd->se_tfo->queue_data_in(cmd);
3555 if (ret < 0)
3556 return ret;
3557 }
3558 /* Fall through for DMA_TO_DEVICE */
3559 case DMA_NONE:
3560 ret = cmd->se_tfo->queue_status(cmd);
3561 break;
3562 default:
3563 break;
3564 }
3565
3566 return ret;
3567}
3568
3569static void transport_handle_queue_full(
3570 struct se_cmd *cmd,
3571 struct se_device *dev,
3572 int (*qf_callback)(struct se_cmd *))
3573{
3574 spin_lock_irq(&dev->qf_cmd_lock);
3575 cmd->se_cmd_flags |= SCF_EMULATE_QUEUE_FULL;
3576 cmd->transport_qf_callback = qf_callback;
3577 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3578 atomic_inc(&dev->dev_qf_count);
3579 smp_mb__after_atomic_inc();
3580 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3581
3582 schedule_work(&cmd->se_dev->qf_work_queue);
3583}
3584
c66ac9db
NB		 3585static void transport_generic_complete_ok(struct se_cmd *cmd)
3586{
07bde79a 3587 int reason = 0, ret;
c66ac9db
NB		 3588 /*
3589 * Check if we need to move delayed/dormant tasks from cmds on the
3590 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3591 * Attribute.
3592 */
5951146d 3593 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3594 transport_complete_task_attr(cmd);
07bde79a
NB		 3595 /*
3596 * Check to schedule QUEUE_FULL work, or execute an existing
3597 * cmd->transport_qf_callback()
3598 */
3599 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3600 schedule_work(&cmd->se_dev->qf_work_queue);
3601
3602 if (cmd->transport_qf_callback) {
3603 ret = cmd->transport_qf_callback(cmd);
3604 if (ret < 0)
3605 goto queue_full;
3606
3607 cmd->transport_qf_callback = NULL;
3608 goto done;
3609 }
c66ac9db
NB		 3610 /*
3611 * Check if we need to retrieve a sense buffer from
3612 * the struct se_cmd in question.
3613 */
3614 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3615 if (transport_get_sense_data(cmd) < 0)
3616 reason = TCM_NON_EXISTENT_LUN;
3617
3618 /*
3619 * Only set when an struct se_task->task_scsi_status returned
3620 * a non GOOD status.
3621 */
3622 if (cmd->scsi_status) {
07bde79a 3623 ret = transport_send_check_condition_and_sense(
c66ac9db 3624 cmd, reason, 1);
07bde79a
NB		 3625 if (ret == -EAGAIN)
3626 goto queue_full;
3627
c66ac9db
NB		 3628 transport_lun_remove_cmd(cmd);
3629 transport_cmd_check_stop_to_fabric(cmd);
3630 return;
3631 }
3632 }
3633 /*
25985edc 3634 * Check for a callback, used by amongst other things
c66ac9db
NB		 3635 * XDWRITE_READ_10 emulation.
3636 */
3637 if (cmd->transport_complete_callback)
3638 cmd->transport_complete_callback(cmd);
3639
3640 switch (cmd->data_direction) {
3641 case DMA_FROM_DEVICE:
3642 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3643 if (cmd->se_lun->lun_sep) {
3644 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3645 cmd->data_length;
3646 }
3647 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3648
07bde79a
NB		 3649 ret = cmd->se_tfo->queue_data_in(cmd);
3650 if (ret == -EAGAIN)
3651 goto queue_full;
c66ac9db
NB		 3652 break;
3653 case DMA_TO_DEVICE:
3654 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3655 if (cmd->se_lun->lun_sep) {
3656 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3657 cmd->data_length;
3658 }
3659 spin_unlock(&cmd->se_lun->lun_sep_lock);
3660 /*
3661 * Check if we need to send READ payload for BIDI-COMMAND
3662 */
ec98f782 3663 if (cmd->t_bidi_data_sg) {
c66ac9db 3664 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3665 if (cmd->se_lun->lun_sep) {
3666 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3667 cmd->data_length;
3668 }
3669 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a
NB		 3670 ret = cmd->se_tfo->queue_data_in(cmd);
3671 if (ret == -EAGAIN)
3672 goto queue_full;
c66ac9db
NB		 3673 break;
3674 }
3675 /* Fall through for DMA_TO_DEVICE */
3676 case DMA_NONE:
07bde79a
NB		 3677 ret = cmd->se_tfo->queue_status(cmd);
3678 if (ret == -EAGAIN)
3679 goto queue_full;
c66ac9db
NB		 3680 break;
3681 default:
3682 break;
3683 }
3684
07bde79a 3685done:
c66ac9db
NB		 3686 transport_lun_remove_cmd(cmd);
3687 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3688 return;
3689
3690queue_full:
6708bb27 3691 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a
NB		 3692 " data_direction: %d\n", cmd, cmd->data_direction);
3693 transport_handle_queue_full(cmd, cmd->se_dev, transport_complete_qf);
c66ac9db
NB		 3694}
3695
3696static void transport_free_dev_tasks(struct se_cmd *cmd)
3697{
3698 struct se_task *task, *task_tmp;
3699 unsigned long flags;
3700
a1d8b49a 3701 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3702 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3703 &cmd->t_task_list, t_list) {
c66ac9db
NB		 3704 if (atomic_read(&task->task_active))
3705 continue;
3706
3707 kfree(task->task_sg_bidi);
3708 kfree(task->task_sg);
3709
3710 list_del(&task->t_list);
3711
a1d8b49a 3712 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3713 if (task->se_dev)
e3d6f909 3714 task->se_dev->transport->free_task(task);
c66ac9db 3715 else
6708bb27 3716 pr_err("task[%u] - task->se_dev is NULL\n",
c66ac9db 3717 task->task_no);
a1d8b49a 3718 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3719 }
a1d8b49a 3720 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3721}
3722
6708bb27 3723static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3724{
ec98f782 3725 struct scatterlist *sg;
ec98f782 3726 int count;
c66ac9db 3727
6708bb27
AG		 3728 for_each_sg(sgl, sg, nents, count)
3729 __free_page(sg_page(sg));
c66ac9db 3730
6708bb27
AG		 3731 kfree(sgl);
3732}
c66ac9db 3733
6708bb27
AG		 3734static inline void transport_free_pages(struct se_cmd *cmd)
3735{
3736 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3737 return;
3738
3739 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3740 cmd->t_data_sg = NULL;
3741 cmd->t_data_nents = 0;
c66ac9db 3742
6708bb27 3743 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3744 cmd->t_bidi_data_sg = NULL;
3745 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3746}
3747
3748static inline void transport_release_tasks(struct se_cmd *cmd)
3749{
3750 transport_free_dev_tasks(cmd);
3751}
3752
3753static inline int transport_dec_and_check(struct se_cmd *cmd)
3754{
3755 unsigned long flags;
3756
a1d8b49a
AG		 3757 spin_lock_irqsave(&cmd->t_state_lock, flags);
3758 if (atomic_read(&cmd->t_fe_count)) {
6708bb27 3759 if (!atomic_dec_and_test(&cmd->t_fe_count)) {
a1d8b49a 3760 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 3761 flags);
3762 return 1;
3763 }
3764 }
3765
a1d8b49a 3766 if (atomic_read(&cmd->t_se_count)) {
6708bb27 3767 if (!atomic_dec_and_test(&cmd->t_se_count)) {
a1d8b49a 3768 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 3769 flags);
3770 return 1;
3771 }
3772 }
a1d8b49a 3773 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3774
3775 return 0;
3776}
3777
3778static void transport_release_fe_cmd(struct se_cmd *cmd)
3779{
3780 unsigned long flags;
3781
3782 if (transport_dec_and_check(cmd))
3783 return;
3784
a1d8b49a 3785 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 3786 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 3787 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3788 goto free_pages;
3789 }
a1d8b49a 3790 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 3791 transport_all_task_dev_remove_state(cmd);
a1d8b49a 3792 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3793
3794 transport_release_tasks(cmd);
3795free_pages:
3796 transport_free_pages(cmd);
31afc39c 3797 transport_release_cmd(cmd);
c66ac9db
NB		 3798}
3799
35462975
CH		 3800static int
3801transport_generic_remove(struct se_cmd *cmd, int session_reinstatement)
c66ac9db
NB		 3802{
3803 unsigned long flags;
3804
c66ac9db
NB		 3805 if (transport_dec_and_check(cmd)) {
3806 if (session_reinstatement) {
a1d8b49a 3807 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3808 transport_all_task_dev_remove_state(cmd);
a1d8b49a 3809 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 3810 flags);
3811 }
3812 return 1;
3813 }
3814
a1d8b49a 3815 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 3816 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 3817 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3818 goto free_pages;
3819 }
a1d8b49a 3820 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 3821 transport_all_task_dev_remove_state(cmd);
a1d8b49a 3822 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3823
3824 transport_release_tasks(cmd);
5951146d 3825
c66ac9db
NB		 3826free_pages:
3827 transport_free_pages(cmd);
35462975 3828 transport_release_cmd(cmd);
c66ac9db
NB		 3829 return 0;
3830}
3831
3832/*
ec98f782
AG		 3833 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3834 * allocating in the core.
c66ac9db
NB		 3835 * @cmd: Associated se_cmd descriptor
3836 * @mem: SGL style memory for TCM WRITE / READ
3837 * @sg_mem_num: Number of SGL elements
3838 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3839 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3840 *
3841 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3842 * of parameters.
3843 */
3844int transport_generic_map_mem_to_cmd(
3845 struct se_cmd *cmd,
5951146d
AG		 3846 struct scatterlist *sgl,
3847 u32 sgl_count,
3848 struct scatterlist *sgl_bidi,
3849 u32 sgl_bidi_count)
c66ac9db 3850{
5951146d 3851 if (!sgl || !sgl_count)
c66ac9db 3852 return 0;
c66ac9db 3853
c66ac9db
NB		 3854 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3855 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
c66ac9db 3856
ec98f782
AG		 3857 cmd->t_data_sg = sgl;
3858 cmd->t_data_nents = sgl_count;
c66ac9db 3859
ec98f782
AG		 3860 if (sgl_bidi && sgl_bidi_count) {
3861 cmd->t_bidi_data_sg = sgl_bidi;
3862 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3863 }
3864 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3865 }
3866
3867 return 0;
3868}
3869EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3870
c66ac9db
NB		 3871static int transport_new_cmd_obj(struct se_cmd *cmd)
3872{
5951146d 3873 struct se_device *dev = cmd->se_dev;
01cde4d5 3874 int set_counts = 1, rc, task_cdbs;
c66ac9db 3875
ec98f782
AG		 3876 /*
3877 * Setup any BIDI READ tasks and memory from
3878 * cmd->t_mem_bidi_list so the READ struct se_tasks
3879 * are queued first for the non pSCSI passthrough case.
3880 */
3881 if (cmd->t_bidi_data_sg &&
3882 (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) {
3883 rc = transport_allocate_tasks(cmd,
3884 cmd->t_task_lba,
3885 DMA_FROM_DEVICE,
3886 cmd->t_bidi_data_sg,
3887 cmd->t_bidi_data_nents);
6708bb27 3888 if (rc <= 0) {
c66ac9db
NB		 3889 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3890 cmd->scsi_sense_reason =
ec98f782 3891 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
01cde4d5 3892 return -EINVAL;
c66ac9db 3893 }
ec98f782
AG		 3894 atomic_inc(&cmd->t_fe_count);
3895 atomic_inc(&cmd->t_se_count);
3896 set_counts = 0;
3897 }
3898 /*
3899 * Setup the tasks and memory from cmd->t_mem_list
3900 * Note for BIDI transfers this will contain the WRITE payload
3901 */
3902 task_cdbs = transport_allocate_tasks(cmd,
3903 cmd->t_task_lba,
3904 cmd->data_direction,
3905 cmd->t_data_sg,
3906 cmd->t_data_nents);
6708bb27 3907 if (task_cdbs <= 0) {
ec98f782
AG		 3908 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3909 cmd->scsi_sense_reason =
3910 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
01cde4d5 3911 return -EINVAL;
ec98f782 3912 }
c66ac9db 3913
ec98f782
AG		 3914 if (set_counts) {
3915 atomic_inc(&cmd->t_fe_count);
3916 atomic_inc(&cmd->t_se_count);
c66ac9db
NB		 3917 }
3918
ec98f782
AG		 3919 cmd->t_task_list_num = task_cdbs;
3920
a1d8b49a
AG		 3921 atomic_set(&cmd->t_task_cdbs_left, task_cdbs);
3922 atomic_set(&cmd->t_task_cdbs_ex_left, task_cdbs);
3923 atomic_set(&cmd->t_task_cdbs_timeout_left, task_cdbs);
c66ac9db
NB		 3924 return 0;
3925}
3926
05d1c7c0
AG		 3927void *transport_kmap_first_data_page(struct se_cmd *cmd)
3928{
ec98f782 3929 struct scatterlist *sg = cmd->t_data_sg;
05d1c7c0 3930
ec98f782 3931 BUG_ON(!sg);
05d1c7c0 3932 /*
ec98f782
AG		 3933 * We need to take into account a possible offset here for fabrics like
3934 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3935 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3936 */
ec98f782 3937 return kmap(sg_page(sg)) + sg->offset;
05d1c7c0
AG		 3938}
3939EXPORT_SYMBOL(transport_kmap_first_data_page);
3940
3941void transport_kunmap_first_data_page(struct se_cmd *cmd)
3942{
ec98f782 3943 kunmap(sg_page(cmd->t_data_sg));
05d1c7c0
AG		 3944}
3945EXPORT_SYMBOL(transport_kunmap_first_data_page);
3946
c66ac9db 3947static int
05d1c7c0 3948transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3949{
ec98f782
AG		 3950 u32 length = cmd->data_length;
3951 unsigned int nents;
3952 struct page *page;
3953 int i = 0;
c66ac9db 3954
ec98f782
AG		 3955 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3956 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3957 if (!cmd->t_data_sg)
3958 return -ENOMEM;
c66ac9db 3959
ec98f782
AG		 3960 cmd->t_data_nents = nents;
3961 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3962
ec98f782
AG		 3963 while (length) {
3964 u32 page_len = min_t(u32, length, PAGE_SIZE);
3965 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3966 if (!page)
3967 goto out;
c66ac9db 3968
ec98f782
AG		 3969 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3970 length -= page_len;
3971 i++;
c66ac9db 3972 }
c66ac9db 3973 return 0;
c66ac9db 3974
ec98f782
AG		 3975out:
3976 while (i >= 0) {
3977 __free_page(sg_page(&cmd->t_data_sg[i]));
3978 i--;
c66ac9db 3979 }
ec98f782
AG		 3980 kfree(cmd->t_data_sg);
3981 cmd->t_data_sg = NULL;
3982 return -ENOMEM;
c66ac9db
NB		 3983}
3984
a1d8b49a
AG		 3985/* Reduce sectors if they are too long for the device */
3986static inline sector_t transport_limit_task_sectors(
c66ac9db
NB		 3987 struct se_device *dev,
3988 unsigned long long lba,
a1d8b49a 3989 sector_t sectors)
c66ac9db 3990{
a1d8b49a 3991 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db 3992
a1d8b49a
AG		 3993 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3994 if ((lba + sectors) > transport_dev_end_lba(dev))
3995 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
c66ac9db 3996
a1d8b49a 3997 return sectors;
c66ac9db
NB		 3998}
3999
c66ac9db
NB		 4000
4001/*
4002 * This function can be used by HW target mode drivers to create a linked
4003 * scatterlist from all contiguously allocated struct se_task->task_sg[].
4004 * This is intended to be called during the completion path by TCM Core
4005 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
4006 */
4007void transport_do_task_sg_chain(struct se_cmd *cmd)
4008{
ec98f782
AG		 4009 struct scatterlist *sg_first = NULL;
4010 struct scatterlist *sg_prev = NULL;
4011 int sg_prev_nents = 0;
4012 struct scatterlist *sg;
c66ac9db 4013 struct se_task *task;
ec98f782 4014 u32 chained_nents = 0;
c66ac9db
NB		 4015 int i;
4016
ec98f782
AG		 4017 BUG_ON(!cmd->se_tfo->task_sg_chaining);
4018
c66ac9db
NB		 4019 /*
4020 * Walk the struct se_task list and setup scatterlist chains
a1d8b49a 4021 * for each contiguously allocated struct se_task->task_sg[].
c66ac9db 4022 */
a1d8b49a 4023 list_for_each_entry(task, &cmd->t_task_list, t_list) {
ec98f782 4024 if (!task->task_sg)
c66ac9db
NB		 4025 continue;
4026
ec98f782
AG		 4027 if (!sg_first) {
4028 sg_first = task->task_sg;
6708bb27 4029 chained_nents = task->task_sg_nents;
97868c89 4030 } else {
ec98f782 4031 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
6708bb27 4032 chained_nents += task->task_sg_nents;
97868c89 4033 }
c3c74c7a
NB		 4034 /*
4035 * For the padded tasks, use the extra SGL vector allocated
4036 * in transport_allocate_data_tasks() for the sg_prev_nents
4037 * offset into sg_chain() above.. The last task of a
4038 * multi-task list, or a single task will not have
4039 * task->task_sg_padded set..
4040 */
4041 if (task->task_padded_sg)
4042 sg_prev_nents = (task->task_sg_nents + 1);
4043 else
4044 sg_prev_nents = task->task_sg_nents;
ec98f782
AG		 4045
4046 sg_prev = task->task_sg;
c66ac9db
NB		 4047 }
4048 /*
4049 * Setup the starting pointer and total t_tasks_sg_linked_no including
4050 * padding SGs for linking and to mark the end.
4051 */
a1d8b49a 4052 cmd->t_tasks_sg_chained = sg_first;
ec98f782 4053 cmd->t_tasks_sg_chained_no = chained_nents;
c66ac9db 4054
6708bb27 4055 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
a1d8b49a
AG		 4056 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
4057 cmd->t_tasks_sg_chained_no);
c66ac9db 4058
a1d8b49a
AG		 4059 for_each_sg(cmd->t_tasks_sg_chained, sg,
4060 cmd->t_tasks_sg_chained_no, i) {
c66ac9db 4061
6708bb27 4062 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
5951146d 4063 i, sg, sg_page(sg), sg->length, sg->offset);
c66ac9db 4064 if (sg_is_chain(sg))
6708bb27 4065 pr_debug("SG: %p sg_is_chain=1\n", sg);
c66ac9db 4066 if (sg_is_last(sg))
6708bb27 4067 pr_debug("SG: %p sg_is_last=1\n", sg);
c66ac9db 4068 }
c66ac9db
NB		 4069}
4070EXPORT_SYMBOL(transport_do_task_sg_chain);
4071
a1d8b49a
AG		 4072/*
4073 * Break up cmd into chunks transport can handle
4074 */
ec98f782 4075static int transport_allocate_data_tasks(
c66ac9db
NB		 4076 struct se_cmd *cmd,
4077 unsigned long long lba,
c66ac9db 4078 enum dma_data_direction data_direction,
ec98f782
AG		 4079 struct scatterlist *sgl,
4080 unsigned int sgl_nents)
c66ac9db
NB		 4081{
4082 unsigned char *cdb = NULL;
4083 struct se_task *task;
5951146d 4084 struct se_device *dev = cmd->se_dev;
ec98f782 4085 unsigned long flags;
1d20bb61 4086 int task_count, i, ret;
277c5f27 4087 sector_t sectors, dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
ec98f782
AG		 4088 u32 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
4089 struct scatterlist *sg;
4090 struct scatterlist *cmd_sg;
a1d8b49a 4091
ec98f782
AG		 4092 WARN_ON(cmd->data_length % sector_size);
4093 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
277c5f27
NB		 4094 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
4095
ec98f782
AG		 4096 cmd_sg = sgl;
4097 for (i = 0; i < task_count; i++) {
c3c74c7a 4098 unsigned int task_size, task_sg_nents_padded;
ec98f782 4099 int count;
a1d8b49a 4100
c66ac9db 4101 task = transport_generic_get_task(cmd, data_direction);
a1d8b49a 4102 if (!task)
ec98f782 4103 return -ENOMEM;
c66ac9db 4104
c66ac9db 4105 task->task_lba = lba;
ec98f782
AG		 4106 task->task_sectors = min(sectors, dev_max_sectors);
4107 task->task_size = task->task_sectors * sector_size;
c66ac9db 4108
e3d6f909 4109 cdb = dev->transport->get_cdb(task);
a1d8b49a
AG		 4110 BUG_ON(!cdb);
4111
4112 memcpy(cdb, cmd->t_task_cdb,
4113 scsi_command_size(cmd->t_task_cdb));
4114
4115 /* Update new cdb with updated lba/sectors */
3a867205 4116 cmd->transport_split_cdb(task->task_lba, task->task_sectors, cdb);
525a48a2
NB		 4117 /*
4118 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
4119 * in order to calculate the number per task SGL entries
4120 */
4121 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
c66ac9db 4122 /*
ec98f782
AG		 4123 * Check if the fabric module driver is requesting that all
4124 * struct se_task->task_sg[] be chained together.. If so,
4125 * then allocate an extra padding SG entry for linking and
c3c74c7a
NB		 4126 * marking the end of the chained SGL for every task except
4127 * the last one for (task_count > 1) operation, or skipping
4128 * the extra padding for the (task_count == 1) case.
c66ac9db 4129 */
c3c74c7a
NB		 4130 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
4131 task_sg_nents_padded = (task->task_sg_nents + 1);
ec98f782 4132 task->task_padded_sg = 1;
c3c74c7a
NB		 4133 } else
4134 task_sg_nents_padded = task->task_sg_nents;
c66ac9db 4135
1d20bb61 4136 task->task_sg = kmalloc(sizeof(struct scatterlist) *
c3c74c7a 4137 task_sg_nents_padded, GFP_KERNEL);
ec98f782
AG		 4138 if (!task->task_sg) {
4139 cmd->se_dev->transport->free_task(task);
4140 return -ENOMEM;
4141 }
4142
c3c74c7a 4143 sg_init_table(task->task_sg, task_sg_nents_padded);
c66ac9db 4144
ec98f782
AG		 4145 task_size = task->task_size;
4146
4147 /* Build new sgl, only up to task_size */
6708bb27 4148 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
ec98f782
AG		 4149 if (cmd_sg->length > task_size)
4150 break;
4151
4152 *sg = *cmd_sg;
4153 task_size -= cmd_sg->length;
4154 cmd_sg = sg_next(cmd_sg);
c66ac9db 4155 }
c66ac9db 4156
ec98f782
AG		 4157 lba += task->task_sectors;
4158 sectors -= task->task_sectors;
c66ac9db 4159
ec98f782
AG		 4160 spin_lock_irqsave(&cmd->t_state_lock, flags);
4161 list_add_tail(&task->t_list, &cmd->t_task_list);
4162 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4163 }
1d20bb61
NB		 4164 /*
4165 * Now perform the memory map of task->task_sg[] into backend
4166 * subsystem memory..
4167 */
4168 list_for_each_entry(task, &cmd->t_task_list, t_list) {
4169 if (atomic_read(&task->task_sent))
4170 continue;
4171 if (!dev->transport->map_data_SG)
4172 continue;
4173
4174 ret = dev->transport->map_data_SG(task);
4175 if (ret < 0)
4176 return 0;
4177 }
c66ac9db 4178
ec98f782 4179 return task_count;
c66ac9db
NB		 4180}
4181
4182static int
ec98f782 4183transport_allocate_control_task(struct se_cmd *cmd)
c66ac9db 4184{
5951146d 4185 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4186 unsigned char *cdb;
4187 struct se_task *task;
ec98f782 4188 unsigned long flags;
6708bb27 4189 int ret = 0;
c66ac9db
NB		 4190
4191 task = transport_generic_get_task(cmd, cmd->data_direction);
4192 if (!task)
ec98f782 4193 return -ENOMEM;
c66ac9db 4194
e3d6f909 4195 cdb = dev->transport->get_cdb(task);
a1d8b49a
AG		 4196 BUG_ON(!cdb);
4197 memcpy(cdb, cmd->t_task_cdb,
4198 scsi_command_size(cmd->t_task_cdb));
c66ac9db 4199
ec98f782
AG		 4200 task->task_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
4201 GFP_KERNEL);
4202 if (!task->task_sg) {
4203 cmd->se_dev->transport->free_task(task);
4204 return -ENOMEM;
4205 }
4206
4207 memcpy(task->task_sg, cmd->t_data_sg,
4208 sizeof(struct scatterlist) * cmd->t_data_nents);
c66ac9db 4209 task->task_size = cmd->data_length;
6708bb27 4210 task->task_sg_nents = cmd->t_data_nents;
c66ac9db 4211
ec98f782
AG		 4212 spin_lock_irqsave(&cmd->t_state_lock, flags);
4213 list_add_tail(&task->t_list, &cmd->t_task_list);
4214 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4215
4216 if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) {
1d20bb61
NB		 4217 if (dev->transport->map_control_SG)
4218 ret = dev->transport->map_control_SG(task);
c66ac9db
NB		 4219 } else if (cmd->se_cmd_flags & SCF_SCSI_NON_DATA_CDB) {
4220 if (dev->transport->cdb_none)
6708bb27 4221 ret = dev->transport->cdb_none(task);
c66ac9db 4222 } else {
6708bb27 4223 pr_err("target: Unknown control cmd type!\n");
c66ac9db 4224 BUG();
ec98f782 4225 }
6708bb27
AG		 4226
4227 /* Success! Return number of tasks allocated */
4228 if (ret == 0)
4229 return 1;
4230 return ret;
ec98f782
AG		 4231}
4232
4233static u32 transport_allocate_tasks(
4234 struct se_cmd *cmd,
4235 unsigned long long lba,
4236 enum dma_data_direction data_direction,
4237 struct scatterlist *sgl,
4238 unsigned int sgl_nents)
4239{
01cde4d5
NB		 4240 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
4241 if (transport_cmd_get_valid_sectors(cmd) < 0)
4242 return -EINVAL;
4243
ec98f782
AG		 4244 return transport_allocate_data_tasks(cmd, lba, data_direction,
4245 sgl, sgl_nents);
01cde4d5 4246 } else
6708bb27
AG		 4247 return transport_allocate_control_task(cmd);
4248
c66ac9db
NB		 4249}
4250
ec98f782 4251
c66ac9db
NB		 4252/* transport_generic_new_cmd(): Called from transport_processing_thread()
4253 *
4254 * Allocate storage transport resources from a set of values predefined
4255 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4256 * Any non zero return here is treated as an "out of resource' op here.
4257 */
4258 /*
4259 * Generate struct se_task(s) and/or their payloads for this CDB.
4260 */
a1d8b49a 4261int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 4262{
c66ac9db
NB		 4263 int ret = 0;
4264
4265 /*
4266 * Determine is the TCM fabric module has already allocated physical
4267 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 4268 * beforehand.
c66ac9db 4269 */
ec98f782
AG		 4270 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
4271 cmd->data_length) {
05d1c7c0 4272 ret = transport_generic_get_mem(cmd);
c66ac9db
NB		 4273 if (ret < 0)
4274 return ret;
4275 }
1d20bb61
NB		 4276 /*
4277 * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4278 * control or data CDB types, and perform the map to backend subsystem
4279 * code from SGL memory allocated here by transport_generic_get_mem(), or
4280 * via pre-existing SGL memory setup explictly by fabric module code with
4281 * transport_generic_map_mem_to_cmd().
4282 */
c66ac9db
NB		 4283 ret = transport_new_cmd_obj(cmd);
4284 if (ret < 0)
4285 return ret;
c66ac9db 4286 /*
a1d8b49a 4287 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 4288 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4289 * will be added to the struct se_device execution queue after its WRITE
4290 * data has arrived. (ie: It gets handled by the transport processing
4291 * thread a second time)
4292 */
4293 if (cmd->data_direction == DMA_TO_DEVICE) {
4294 transport_add_tasks_to_state_queue(cmd);
4295 return transport_generic_write_pending(cmd);
4296 }
4297 /*
4298 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4299 * to the execution queue.
4300 */
4301 transport_execute_tasks(cmd);
4302 return 0;
4303}
a1d8b49a 4304EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 4305
4306/* transport_generic_process_write():
4307 *
4308 *
4309 */
4310void transport_generic_process_write(struct se_cmd *cmd)
4311{
c66ac9db
NB		 4312 transport_execute_tasks(cmd);
4313}
4314EXPORT_SYMBOL(transport_generic_process_write);
4315
07bde79a
NB		 4316static int transport_write_pending_qf(struct se_cmd *cmd)
4317{
4318 return cmd->se_tfo->write_pending(cmd);
4319}
4320
c66ac9db
NB		 4321/* transport_generic_write_pending():
4322 *
4323 *
4324 */
4325static int transport_generic_write_pending(struct se_cmd *cmd)
4326{
4327 unsigned long flags;
4328 int ret;
4329
a1d8b49a 4330 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4331 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 4332 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a
NB		 4333
4334 if (cmd->transport_qf_callback) {
4335 ret = cmd->transport_qf_callback(cmd);
4336 if (ret == -EAGAIN)
4337 goto queue_full;
4338 else if (ret < 0)
4339 return ret;
4340
4341 cmd->transport_qf_callback = NULL;
4342 return 0;
4343 }
05d1c7c0 4344
c66ac9db
NB		 4345 /*
4346 * Clear the se_cmd for WRITE_PENDING status in order to set
a1d8b49a 4347 * cmd->t_transport_active=0 so that transport_generic_handle_data
c66ac9db 4348 * can be called from HW target mode interrupt code. This is safe
e3d6f909 4349 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 4350 * because the se_cmd->se_lun pointer is not being cleared.
4351 */
4352 transport_cmd_check_stop(cmd, 1, 0);
4353
4354 /*
4355 * Call the fabric write_pending function here to let the
4356 * frontend know that WRITE buffers are ready.
4357 */
e3d6f909 4358 ret = cmd->se_tfo->write_pending(cmd);
07bde79a
NB		 4359 if (ret == -EAGAIN)
4360 goto queue_full;
4361 else if (ret < 0)
c66ac9db
NB		 4362 return ret;
4363
4364 return PYX_TRANSPORT_WRITE_PENDING;
07bde79a
NB		 4365
4366queue_full:
6708bb27 4367 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a
NB		 4368 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
4369 transport_handle_queue_full(cmd, cmd->se_dev,
4370 transport_write_pending_qf);
4371 return ret;
c66ac9db
NB		 4372}
4373
35462975 4374void transport_release_cmd(struct se_cmd *cmd)
c66ac9db 4375{
e3d6f909 4376 BUG_ON(!cmd->se_tfo);
c66ac9db
NB		 4377
4378 transport_free_se_cmd(cmd);
35462975 4379 cmd->se_tfo->release_cmd(cmd);
c66ac9db 4380}
35462975 4381EXPORT_SYMBOL(transport_release_cmd);
c66ac9db
NB		 4382
4383/* transport_generic_free_cmd():
4384 *
4385 * Called from processing frontend to release storage engine resources
4386 */
4387void transport_generic_free_cmd(
4388 struct se_cmd *cmd,
4389 int wait_for_tasks,
c66ac9db
NB		 4390 int session_reinstatement)
4391{
5951146d 4392 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD))
35462975 4393 transport_release_cmd(cmd);
c66ac9db
NB		 4394 else {
4395 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
4396
e3d6f909 4397 if (cmd->se_lun) {
c66ac9db 4398#if 0
6708bb27 4399 pr_debug("cmd: %p ITT: 0x%08x contains"
e3d6f909
AG		 4400 " cmd->se_lun\n", cmd,
4401 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4402#endif
4403 transport_lun_remove_cmd(cmd);
4404 }
4405
4406 if (wait_for_tasks && cmd->transport_wait_for_tasks)
4407 cmd->transport_wait_for_tasks(cmd, 0, 0);
4408
f4366772
NB		 4409 transport_free_dev_tasks(cmd);
4410
35462975 4411 transport_generic_remove(cmd, session_reinstatement);
c66ac9db
NB		 4412 }
4413}
4414EXPORT_SYMBOL(transport_generic_free_cmd);
4415
4416static void transport_nop_wait_for_tasks(
4417 struct se_cmd *cmd,
4418 int remove_cmd,
4419 int session_reinstatement)
4420{
4421 return;
4422}
4423
4424/* transport_lun_wait_for_tasks():
4425 *
4426 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4427 * an struct se_lun to be successfully shutdown.
4428 */
4429static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4430{
4431 unsigned long flags;
4432 int ret;
4433 /*
4434 * If the frontend has already requested this struct se_cmd to
4435 * be stopped, we can safely ignore this struct se_cmd.
4436 */
a1d8b49a
AG		 4437 spin_lock_irqsave(&cmd->t_state_lock, flags);
4438 if (atomic_read(&cmd->t_transport_stop)) {
4439 atomic_set(&cmd->transport_lun_stop, 0);
6708bb27 4440 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
e3d6f909 4441 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4442 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4443 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 4444 return -EPERM;
c66ac9db 4445 }
a1d8b49a
AG		 4446 atomic_set(&cmd->transport_lun_fe_stop, 1);
4447 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4448
5951146d 4449 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 4450
4451 ret = transport_stop_tasks_for_cmd(cmd);
4452
6708bb27
AG		 4453 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4454 " %d\n", cmd, cmd->t_task_list_num, ret);
c66ac9db 4455 if (!ret) {
6708bb27 4456 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 4457 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4458 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 4459 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 4460 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4461 }
5951146d 4462 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 4463
4464 return 0;
4465}
4466
c66ac9db
NB		 4467static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4468{
4469 struct se_cmd *cmd = NULL;
4470 unsigned long lun_flags, cmd_flags;
4471 /*
4472 * Do exception processing and return CHECK_CONDITION status to the
4473 * Initiator Port.
4474 */
4475 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 4476 while (!list_empty(&lun->lun_cmd_list)) {
4477 cmd = list_first_entry(&lun->lun_cmd_list,
4478 struct se_cmd, se_lun_node);
4479 list_del(&cmd->se_lun_node);
4480
a1d8b49a 4481 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db
NB		 4482 /*
4483 * This will notify iscsi_target_transport.c:
4484 * transport_cmd_check_stop() that a LUN shutdown is in
4485 * progress for the iscsi_cmd_t.
4486 */
a1d8b49a 4487 spin_lock(&cmd->t_state_lock);
6708bb27 4488 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 4489 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 4490 cmd->se_lun->unpacked_lun,
4491 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a
AG		 4492 atomic_set(&cmd->transport_lun_stop, 1);
4493 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 4494
4495 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4496
6708bb27
AG		 4497 if (!cmd->se_lun) {
4498 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 4499 cmd->se_tfo->get_task_tag(cmd),
4500 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 4501 BUG();
4502 }
4503 /*
4504 * If the Storage engine still owns the iscsi_cmd_t, determine
4505 * and/or stop its context.
4506 */
6708bb27 4507 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 4508 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4509 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4510
e3d6f909 4511 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 4512 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4513 continue;
4514 }
4515
6708bb27 4516 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 4517 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 4518 cmd->se_lun->unpacked_lun,
4519 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4520
a1d8b49a 4521 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
6708bb27 4522 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 4523 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4524 goto check_cond;
4525 }
a1d8b49a 4526 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 4527 transport_all_task_dev_remove_state(cmd);
a1d8b49a 4528 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4529
4530 transport_free_dev_tasks(cmd);
4531 /*
4532 * The Storage engine stopped this struct se_cmd before it was
4533 * send to the fabric frontend for delivery back to the
4534 * Initiator Node. Return this SCSI CDB back with an
4535 * CHECK_CONDITION status.
4536 */
4537check_cond:
4538 transport_send_check_condition_and_sense(cmd,
4539 TCM_NON_EXISTENT_LUN, 0);
4540 /*
4541 * If the fabric frontend is waiting for this iscsi_cmd_t to
4542 * be released, notify the waiting thread now that LU has
4543 * finished accessing it.
4544 */
a1d8b49a
AG		 4545 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4546 if (atomic_read(&cmd->transport_lun_fe_stop)) {
6708bb27 4547 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 4548 " struct se_cmd: %p ITT: 0x%08x\n",
4549 lun->unpacked_lun,
e3d6f909 4550 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4551
a1d8b49a 4552 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 4553 cmd_flags);
4554 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 4555 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 4556 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4557 continue;
4558 }
6708bb27 4559 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 4560 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4561
a1d8b49a 4562 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4563 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4564 }
4565 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4566}
4567
4568static int transport_clear_lun_thread(void *p)
4569{
4570 struct se_lun *lun = (struct se_lun *)p;
4571
4572 __transport_clear_lun_from_sessions(lun);
4573 complete(&lun->lun_shutdown_comp);
4574
4575 return 0;
4576}
4577
4578int transport_clear_lun_from_sessions(struct se_lun *lun)
4579{
4580 struct task_struct *kt;
4581
5951146d 4582 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 4583 "tcm_cl_%u", lun->unpacked_lun);
4584 if (IS_ERR(kt)) {
6708bb27 4585 pr_err("Unable to start clear_lun thread\n");
e3d6f909 4586 return PTR_ERR(kt);
c66ac9db
NB		 4587 }
4588 wait_for_completion(&lun->lun_shutdown_comp);
4589
4590 return 0;
4591}
4592
4593/* transport_generic_wait_for_tasks():
4594 *
4595 * Called from frontend or passthrough context to wait for storage engine
4596 * to pause and/or release frontend generated struct se_cmd.
4597 */
4598static void transport_generic_wait_for_tasks(
4599 struct se_cmd *cmd,
4600 int remove_cmd,
4601 int session_reinstatement)
4602{
4603 unsigned long flags;
4604
4605 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req))
4606 return;
4607
a1d8b49a 4608 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4609 /*
4610 * If we are already stopped due to an external event (ie: LUN shutdown)
4611 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 4612 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 4613 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4614 * has completed its operation on the struct se_cmd.
4615 */
a1d8b49a 4616 if (atomic_read(&cmd->transport_lun_stop)) {
c66ac9db 4617
6708bb27 4618 pr_debug("wait_for_tasks: Stopping"
e3d6f909 4619 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 4620 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 4621 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4622 /*
4623 * There is a special case for WRITES where a FE exception +
4624 * LUN shutdown means ConfigFS context is still sleeping on
4625 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4626 * We go ahead and up transport_lun_stop_comp just to be sure
4627 * here.
4628 */
a1d8b49a
AG		 4629 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4630 complete(&cmd->transport_lun_stop_comp);
4631 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4632 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4633
4634 transport_all_task_dev_remove_state(cmd);
4635 /*
4636 * At this point, the frontend who was the originator of this
4637 * struct se_cmd, now owns the structure and can be released through
4638 * normal means below.
4639 */
6708bb27 4640 pr_debug("wait_for_tasks: Stopped"
e3d6f909 4641 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 4642 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 4643 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4644
a1d8b49a 4645 atomic_set(&cmd->transport_lun_stop, 0);
c66ac9db 4646 }
a1d8b49a
AG		 4647 if (!atomic_read(&cmd->t_transport_active) ||
4648 atomic_read(&cmd->t_transport_aborted))
c66ac9db
NB		 4649 goto remove;
4650
a1d8b49a 4651 atomic_set(&cmd->t_transport_stop, 1);
c66ac9db 4652
6708bb27 4653 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
c66ac9db 4654 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
e3d6f909
AG		 4655 " = TRUE\n", cmd, cmd->se_tfo->get_task_tag(cmd),
4656 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
c66ac9db
NB		 4657 cmd->deferred_t_state);
4658
a1d8b49a 4659 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4660
5951146d 4661 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 4662
a1d8b49a 4663 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 4664
a1d8b49a
AG		 4665 spin_lock_irqsave(&cmd->t_state_lock, flags);
4666 atomic_set(&cmd->t_transport_active, 0);
4667 atomic_set(&cmd->t_transport_stop, 0);
c66ac9db 4668
6708bb27 4669 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4670 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4671 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4672remove:
a1d8b49a 4673 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4674 if (!remove_cmd)
4675 return;
4676
35462975 4677 transport_generic_free_cmd(cmd, 0, session_reinstatement);
c66ac9db
NB		 4678}
4679
4680static int transport_get_sense_codes(
4681 struct se_cmd *cmd,
4682 u8 *asc,
4683 u8 *ascq)
4684{
4685 *asc = cmd->scsi_asc;
4686 *ascq = cmd->scsi_ascq;
4687
4688 return 0;
4689}
4690
4691static int transport_set_sense_codes(
4692 struct se_cmd *cmd,
4693 u8 asc,
4694 u8 ascq)
4695{
4696 cmd->scsi_asc = asc;
4697 cmd->scsi_ascq = ascq;
4698
4699 return 0;
4700}
4701
4702int transport_send_check_condition_and_sense(
4703 struct se_cmd *cmd,
4704 u8 reason,
4705 int from_transport)
4706{
4707 unsigned char *buffer = cmd->sense_buffer;
4708 unsigned long flags;
4709 int offset;
4710 u8 asc = 0, ascq = 0;
4711
a1d8b49a 4712 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4713 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4714 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4715 return 0;
4716 }
4717 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4718 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4719
4720 if (!reason && from_transport)
4721 goto after_reason;
4722
4723 if (!from_transport)
4724 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4725 /*
4726 * Data Segment and SenseLength of the fabric response PDU.
4727 *
4728 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4729 * from include/scsi/scsi_cmnd.h
4730 */
e3d6f909 4731 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4732 TRANSPORT_SENSE_BUFFER);
4733 /*
4734 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4735 * SENSE KEY values from include/scsi/scsi.h
4736 */
4737 switch (reason) {
4738 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4739 /* CURRENT ERROR */
4740 buffer[offset] = 0x70;
4741 /* ILLEGAL REQUEST */
4742 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4743 /* LOGICAL UNIT NOT SUPPORTED */
4744 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4745 break;
c66ac9db
NB		 4746 case TCM_UNSUPPORTED_SCSI_OPCODE:
4747 case TCM_SECTOR_COUNT_TOO_MANY:
4748 /* CURRENT ERROR */
4749 buffer[offset] = 0x70;
4750 /* ILLEGAL REQUEST */
4751 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4752 /* INVALID COMMAND OPERATION CODE */
4753 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4754 break;
4755 case TCM_UNKNOWN_MODE_PAGE:
4756 /* CURRENT ERROR */
4757 buffer[offset] = 0x70;
4758 /* ILLEGAL REQUEST */
4759 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4760 /* INVALID FIELD IN CDB */
4761 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4762 break;
4763 case TCM_CHECK_CONDITION_ABORT_CMD:
4764 /* CURRENT ERROR */
4765 buffer[offset] = 0x70;
4766 /* ABORTED COMMAND */
4767 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4768 /* BUS DEVICE RESET FUNCTION OCCURRED */
4769 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4770 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4771 break;
4772 case TCM_INCORRECT_AMOUNT_OF_DATA:
4773 /* CURRENT ERROR */
4774 buffer[offset] = 0x70;
4775 /* ABORTED COMMAND */
4776 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4777 /* WRITE ERROR */
4778 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4779 /* NOT ENOUGH UNSOLICITED DATA */
4780 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4781 break;
4782 case TCM_INVALID_CDB_FIELD:
4783 /* CURRENT ERROR */
4784 buffer[offset] = 0x70;
4785 /* ABORTED COMMAND */
4786 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4787 /* INVALID FIELD IN CDB */
4788 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4789 break;
4790 case TCM_INVALID_PARAMETER_LIST:
4791 /* CURRENT ERROR */
4792 buffer[offset] = 0x70;
4793 /* ABORTED COMMAND */
4794 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4795 /* INVALID FIELD IN PARAMETER LIST */
4796 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4797 break;
4798 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4799 /* CURRENT ERROR */
4800 buffer[offset] = 0x70;
4801 /* ABORTED COMMAND */
4802 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4803 /* WRITE ERROR */
4804 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4805 /* UNEXPECTED_UNSOLICITED_DATA */
4806 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4807 break;
4808 case TCM_SERVICE_CRC_ERROR:
4809 /* CURRENT ERROR */
4810 buffer[offset] = 0x70;
4811 /* ABORTED COMMAND */
4812 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4813 /* PROTOCOL SERVICE CRC ERROR */
4814 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4815 /* N/A */
4816 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4817 break;
4818 case TCM_SNACK_REJECTED:
4819 /* CURRENT ERROR */
4820 buffer[offset] = 0x70;
4821 /* ABORTED COMMAND */
4822 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4823 /* READ ERROR */
4824 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4825 /* FAILED RETRANSMISSION REQUEST */
4826 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4827 break;
4828 case TCM_WRITE_PROTECTED:
4829 /* CURRENT ERROR */
4830 buffer[offset] = 0x70;
4831 /* DATA PROTECT */
4832 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4833 /* WRITE PROTECTED */
4834 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4835 break;
4836 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4837 /* CURRENT ERROR */
4838 buffer[offset] = 0x70;
4839 /* UNIT ATTENTION */
4840 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4841 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4842 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4843 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4844 break;
4845 case TCM_CHECK_CONDITION_NOT_READY:
4846 /* CURRENT ERROR */
4847 buffer[offset] = 0x70;
4848 /* Not Ready */
4849 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4850 transport_get_sense_codes(cmd, &asc, &ascq);
4851 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4852 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4853 break;
4854 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4855 default:
4856 /* CURRENT ERROR */
4857 buffer[offset] = 0x70;
4858 /* ILLEGAL REQUEST */
4859 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4860 /* LOGICAL UNIT COMMUNICATION FAILURE */
4861 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4862 break;
4863 }
4864 /*
4865 * This code uses linux/include/scsi/scsi.h SAM status codes!
4866 */
4867 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4868 /*
4869 * Automatically padded, this value is encoded in the fabric's
4870 * data_length response PDU containing the SCSI defined sense data.
4871 */
4872 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4873
4874after_reason:
07bde79a 4875 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4876}
4877EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4878
4879int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4880{
4881 int ret = 0;
4882
a1d8b49a 4883 if (atomic_read(&cmd->t_transport_aborted) != 0) {
6708bb27 4884 if (!send_status ||
c66ac9db
NB		 4885 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4886 return 1;
4887#if 0
6708bb27 4888 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4889 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4890 cmd->t_task_cdb[0],
e3d6f909 4891 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4892#endif
4893 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4894 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4895 ret = 1;
4896 }
4897 return ret;
4898}
4899EXPORT_SYMBOL(transport_check_aborted_status);
4900
4901void transport_send_task_abort(struct se_cmd *cmd)
4902{
c252f003
NB		 4903 unsigned long flags;
4904
4905 spin_lock_irqsave(&cmd->t_state_lock, flags);
4906 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4907 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4908 return;
4909 }
4910 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4911
c66ac9db
NB		 4912 /*
4913 * If there are still expected incoming fabric WRITEs, we wait
4914 * until until they have completed before sending a TASK_ABORTED
4915 * response. This response with TASK_ABORTED status will be
4916 * queued back to fabric module by transport_check_aborted_status().
4917 */
4918 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4919 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
a1d8b49a 4920 atomic_inc(&cmd->t_transport_aborted);
c66ac9db
NB		 4921 smp_mb__after_atomic_inc();
4922 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4923 transport_new_cmd_failure(cmd);
4924 return;
4925 }
4926 }
4927 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4928#if 0
6708bb27 4929 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4930 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4931 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4932#endif
e3d6f909 4933 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4934}
4935
4936/* transport_generic_do_tmr():
4937 *
4938 *
4939 */
4940int transport_generic_do_tmr(struct se_cmd *cmd)
4941{
5951146d 4942 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4943 struct se_tmr_req *tmr = cmd->se_tmr_req;
4944 int ret;
4945
4946 switch (tmr->function) {
5c6cd613 4947 case TMR_ABORT_TASK:
c66ac9db
NB		 4948 tmr->response = TMR_FUNCTION_REJECTED;
4949 break;
5c6cd613
NB		 4950 case TMR_ABORT_TASK_SET:
4951 case TMR_CLEAR_ACA:
4952 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4953 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4954 break;
5c6cd613 4955 case TMR_LUN_RESET:
c66ac9db
NB		 4956 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4957 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4958 TMR_FUNCTION_REJECTED;
4959 break;
5c6cd613 4960 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4961 tmr->response = TMR_FUNCTION_REJECTED;
4962 break;
5c6cd613 4963 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4964 tmr->response = TMR_FUNCTION_REJECTED;
4965 break;
c66ac9db 4966 default:
6708bb27 4967 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4968 tmr->function);
4969 tmr->response = TMR_FUNCTION_REJECTED;
4970 break;
4971 }
4972
4973 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4974 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db
NB		 4975
4976 transport_cmd_check_stop(cmd, 2, 0);
4977 return 0;
4978}
4979
4980/*
4981 * Called with spin_lock_irq(&dev->execute_task_lock); held
4982 *
4983 */
4984static struct se_task *
4985transport_get_task_from_state_list(struct se_device *dev)
4986{
4987 struct se_task *task;
4988
4989 if (list_empty(&dev->state_task_list))
4990 return NULL;
4991
4992 list_for_each_entry(task, &dev->state_task_list, t_state_list)
4993 break;
4994
4995 list_del(&task->t_state_list);
4996 atomic_set(&task->task_state_active, 0);
4997
4998 return task;
4999}
5000
5001static void transport_processing_shutdown(struct se_device *dev)
5002{
5003 struct se_cmd *cmd;
c66ac9db 5004 struct se_task *task;
c66ac9db
NB		 5005 unsigned long flags;
5006 /*
5007 * Empty the struct se_device's struct se_task state list.
5008 */
5009 spin_lock_irqsave(&dev->execute_task_lock, flags);
5010 while ((task = transport_get_task_from_state_list(dev))) {
e3d6f909 5011 if (!task->task_se_cmd) {
6708bb27 5012 pr_err("task->task_se_cmd is NULL!\n");
c66ac9db
NB		 5013 continue;
5014 }
e3d6f909 5015 cmd = task->task_se_cmd;
c66ac9db 5016
c66ac9db
NB		 5017 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
5018
a1d8b49a 5019 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 5020
6708bb27
AG		 5021 pr_debug("PT: cmd: %p task: %p ITT: 0x%08x,"
5022 " i_state: %d, t_state/def_t_state:"
c66ac9db 5023 " %d/%d cdb: 0x%02x\n", cmd, task,
6708bb27
AG		 5024 cmd->se_tfo->get_task_tag(cmd),
5025 cmd->se_tfo->get_cmd_state(cmd),
c66ac9db 5026 cmd->t_state, cmd->deferred_t_state,
a1d8b49a 5027 cmd->t_task_cdb[0]);
6708bb27 5028 pr_debug("PT: ITT[0x%08x] - t_tasks: %d t_task_cdbs_left:"
c66ac9db
NB		 5029 " %d t_task_cdbs_sent: %d -- t_transport_active: %d"
5030 " t_transport_stop: %d t_transport_sent: %d\n",
e3d6f909 5031 cmd->se_tfo->get_task_tag(cmd),
6708bb27 5032 cmd->t_task_list_num,
a1d8b49a
AG		 5033 atomic_read(&cmd->t_task_cdbs_left),
5034 atomic_read(&cmd->t_task_cdbs_sent),
5035 atomic_read(&cmd->t_transport_active),
5036 atomic_read(&cmd->t_transport_stop),
5037 atomic_read(&cmd->t_transport_sent));
c66ac9db
NB		 5038
5039 if (atomic_read(&task->task_active)) {
5040 atomic_set(&task->task_stop, 1);
5041 spin_unlock_irqrestore(
a1d8b49a 5042 &cmd->t_state_lock, flags);
c66ac9db 5043
6708bb27 5044 pr_debug("Waiting for task: %p to shutdown for dev:"
c66ac9db
NB		 5045 " %p\n", task, dev);
5046 wait_for_completion(&task->task_stop_comp);
6708bb27 5047 pr_debug("Completed task: %p shutdown for dev: %p\n",
c66ac9db
NB		 5048 task, dev);
5049
a1d8b49a
AG		 5050 spin_lock_irqsave(&cmd->t_state_lock, flags);
5051 atomic_dec(&cmd->t_task_cdbs_left);
c66ac9db
NB		 5052
5053 atomic_set(&task->task_active, 0);
5054 atomic_set(&task->task_stop, 0);
52208ae3
NB		 5055 } else {
5056 if (atomic_read(&task->task_execute_queue) != 0)
5057 transport_remove_task_from_execute_queue(task, dev);
c66ac9db
NB		 5058 }
5059 __transport_stop_task_timer(task, &flags);
5060
6708bb27 5061 if (!atomic_dec_and_test(&cmd->t_task_cdbs_ex_left)) {
c66ac9db 5062 spin_unlock_irqrestore(
a1d8b49a 5063 &cmd->t_state_lock, flags);
c66ac9db 5064
6708bb27 5065 pr_debug("Skipping task: %p, dev: %p for"
c66ac9db 5066 " t_task_cdbs_ex_left: %d\n", task, dev,
a1d8b49a 5067 atomic_read(&cmd->t_task_cdbs_ex_left));
c66ac9db
NB		 5068
5069 spin_lock_irqsave(&dev->execute_task_lock, flags);
5070 continue;
5071 }
5072
a1d8b49a 5073 if (atomic_read(&cmd->t_transport_active)) {
6708bb27 5074 pr_debug("got t_transport_active = 1 for task: %p, dev:"
c66ac9db
NB		 5075 " %p\n", task, dev);
5076
a1d8b49a 5077 if (atomic_read(&cmd->t_fe_count)) {
c66ac9db 5078 spin_unlock_irqrestore(
a1d8b49a 5079 &cmd->t_state_lock, flags);
c66ac9db
NB		 5080 transport_send_check_condition_and_sense(
5081 cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE,
5082 0);
5083 transport_remove_cmd_from_queue(cmd,
5951146d 5084 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5085
5086 transport_lun_remove_cmd(cmd);
5087 transport_cmd_check_stop(cmd, 1, 0);
5088 } else {
5089 spin_unlock_irqrestore(
a1d8b49a 5090 &cmd->t_state_lock, flags);
c66ac9db
NB		 5091
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
5097 if (transport_cmd_check_stop(cmd, 1, 0))
35462975 5098 transport_generic_remove(cmd, 0);
c66ac9db
NB		 5099 }
5100
5101 spin_lock_irqsave(&dev->execute_task_lock, flags);
5102 continue;
5103 }
6708bb27 5104 pr_debug("Got t_transport_active = 0 for task: %p, dev: %p\n",
c66ac9db
NB		 5105 task, dev);
5106
a1d8b49a 5107 if (atomic_read(&cmd->t_fe_count)) {
c66ac9db 5108 spin_unlock_irqrestore(
a1d8b49a 5109 &cmd->t_state_lock, flags);
c66ac9db
NB		 5110 transport_send_check_condition_and_sense(cmd,
5111 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
5112 transport_remove_cmd_from_queue(cmd,
5951146d 5113 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5114
5115 transport_lun_remove_cmd(cmd);
5116 transport_cmd_check_stop(cmd, 1, 0);
5117 } else {
5118 spin_unlock_irqrestore(
a1d8b49a 5119 &cmd->t_state_lock, flags);
c66ac9db
NB		 5120
5121 transport_remove_cmd_from_queue(cmd,
5951146d 5122 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5123 transport_lun_remove_cmd(cmd);
5124
5125 if (transport_cmd_check_stop(cmd, 1, 0))
35462975 5126 transport_generic_remove(cmd, 0);
c66ac9db
NB		 5127 }
5128
5129 spin_lock_irqsave(&dev->execute_task_lock, flags);
5130 }
5131 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
5132 /*
5133 * Empty the struct se_device's struct se_cmd list.
5134 */
5951146d 5135 while ((cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj))) {
c66ac9db 5136
6708bb27 5137 pr_debug("From Device Queue: cmd: %p t_state: %d\n",
5951146d 5138 cmd, cmd->t_state);
c66ac9db 5139
a1d8b49a 5140 if (atomic_read(&cmd->t_fe_count)) {
c66ac9db
NB		 5141 transport_send_check_condition_and_sense(cmd,
5142 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
5143
5144 transport_lun_remove_cmd(cmd);
5145 transport_cmd_check_stop(cmd, 1, 0);
5146 } else {
5147 transport_lun_remove_cmd(cmd);
5148 if (transport_cmd_check_stop(cmd, 1, 0))
35462975 5149 transport_generic_remove(cmd, 0);
c66ac9db 5150 }
c66ac9db 5151 }
c66ac9db
NB		 5152}
5153
5154/* transport_processing_thread():
5155 *
5156 *
5157 */
5158static int transport_processing_thread(void *param)
5159{
5951146d 5160 int ret;
c66ac9db
NB		 5161 struct se_cmd *cmd;
5162 struct se_device *dev = (struct se_device *) param;
c66ac9db
NB		 5163
5164 set_user_nice(current, -20);
5165
5166 while (!kthread_should_stop()) {
e3d6f909
AG		 5167 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
5168 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 5169 kthread_should_stop());
5170 if (ret < 0)
5171 goto out;
5172
5173 spin_lock_irq(&dev->dev_status_lock);
5174 if (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) {
5175 spin_unlock_irq(&dev->dev_status_lock);
5176 transport_processing_shutdown(dev);
5177 continue;
5178 }
5179 spin_unlock_irq(&dev->dev_status_lock);
5180
5181get_cmd:
5182 __transport_execute_tasks(dev);
5183
5951146d
AG		 5184 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
5185 if (!cmd)
c66ac9db
NB		 5186 continue;
5187
5951146d 5188 switch (cmd->t_state) {
680b73c5
CH		 5189 case TRANSPORT_NEW_CMD:
5190 BUG();
5191 break;
c66ac9db 5192 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 5193 if (!cmd->se_tfo->new_cmd_map) {
5194 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 5195 " NULL for TRANSPORT_NEW_CMD_MAP\n");
5196 BUG();
5197 }
e3d6f909 5198 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db
NB		 5199 if (ret < 0) {
5200 cmd->transport_error_status = ret;
5201 transport_generic_request_failure(cmd, NULL,
5202 0, (cmd->data_direction !=
5203 DMA_TO_DEVICE));
5204 break;
5205 }
c66ac9db 5206 ret = transport_generic_new_cmd(cmd);
07bde79a
NB		 5207 if (ret == -EAGAIN)
5208 break;
5209 else if (ret < 0) {
c66ac9db
NB		 5210 cmd->transport_error_status = ret;
5211 transport_generic_request_failure(cmd, NULL,
5212 0, (cmd->data_direction !=
5213 DMA_TO_DEVICE));
5214 }
5215 break;
5216 case TRANSPORT_PROCESS_WRITE:
5217 transport_generic_process_write(cmd);
5218 break;
5219 case TRANSPORT_COMPLETE_OK:
5220 transport_stop_all_task_timers(cmd);
5221 transport_generic_complete_ok(cmd);
5222 break;
5223 case TRANSPORT_REMOVE:
35462975 5224 transport_generic_remove(cmd, 0);
c66ac9db 5225 break;
f4366772 5226 case TRANSPORT_FREE_CMD_INTR:
35462975 5227 transport_generic_free_cmd(cmd, 0, 0);
f4366772 5228 break;
c66ac9db
NB		 5229 case TRANSPORT_PROCESS_TMR:
5230 transport_generic_do_tmr(cmd);
5231 break;
5232 case TRANSPORT_COMPLETE_FAILURE:
5233 transport_generic_request_failure(cmd, NULL, 1, 1);
5234 break;
5235 case TRANSPORT_COMPLETE_TIMEOUT:
5236 transport_stop_all_task_timers(cmd);
5237 transport_generic_request_timeout(cmd);
5238 break;
07bde79a
NB		 5239 case TRANSPORT_COMPLETE_QF_WP:
5240 transport_generic_write_pending(cmd);
5241 break;
c66ac9db 5242 default:
6708bb27 5243 pr_err("Unknown t_state: %d deferred_t_state:"
c66ac9db 5244 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
5951146d 5245 " %u\n", cmd->t_state, cmd->deferred_t_state,
e3d6f909
AG		 5246 cmd->se_tfo->get_task_tag(cmd),
5247 cmd->se_tfo->get_cmd_state(cmd),
5248 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 5249 BUG();
5250 }
5251
5252 goto get_cmd;
5253 }
5254
5255out:
5256 transport_release_all_cmds(dev);
5257 dev->process_thread = NULL;
5258 return 0;
5259}
Linux kernel - Deliverables
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