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target: use a workqueue for I/O completions
[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"
c66ac9db
NB		 57#include "target_core_ua.h"
58
e3d6f909 59static int sub_api_initialized;
c66ac9db 60
35e0e757 61static struct workqueue_struct *target_completion_wq;
c66ac9db
NB		 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
c66ac9db 72static int transport_generic_write_pending(struct se_cmd *);
5951146d 73static int transport_processing_thread(void *param);
c66ac9db
NB		 74static int __transport_execute_tasks(struct se_device *dev);
75static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 76static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 77 struct se_device *dev);
c66ac9db
NB		 78static void transport_direct_request_timeout(struct se_cmd *cmd);
79static void transport_free_dev_tasks(struct se_cmd *cmd);
a1d8b49a 80static u32 transport_allocate_tasks(struct se_cmd *cmd,
ec98f782 81 unsigned long long starting_lba,
c66ac9db 82 enum dma_data_direction data_direction,
ec98f782 83 struct scatterlist *sgl, unsigned int nents);
05d1c7c0 84static int transport_generic_get_mem(struct se_cmd *cmd);
39c05f32 85static void transport_put_cmd(struct se_cmd *cmd);
3df8d40b 86static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
c66ac9db 87static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
35e0e757
CH		 88static void transport_generic_request_failure(struct se_cmd *, int, int);
89static void target_complete_ok_work(struct work_struct *work);
c66ac9db 90
e3d6f909 91int init_se_kmem_caches(void)
c66ac9db 92{
c66ac9db
NB		 93 se_cmd_cache = kmem_cache_create("se_cmd_cache",
94 sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
6708bb27
AG		 95 if (!se_cmd_cache) {
96 pr_err("kmem_cache_create for struct se_cmd failed\n");
c66ac9db
NB		 97 goto out;
98 }
99 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
100 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
101 0, NULL);
6708bb27
AG		 102 if (!se_tmr_req_cache) {
103 pr_err("kmem_cache_create() for struct se_tmr_req"
c66ac9db 104 " failed\n");
35e0e757 105 goto out_free_cmd_cache;
c66ac9db
NB		 106 }
107 se_sess_cache = kmem_cache_create("se_sess_cache",
108 sizeof(struct se_session), __alignof__(struct se_session),
109 0, NULL);
6708bb27
AG		 110 if (!se_sess_cache) {
111 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 112 " failed\n");
35e0e757 113 goto out_free_tmr_req_cache;
c66ac9db
NB		 114 }
115 se_ua_cache = kmem_cache_create("se_ua_cache",
116 sizeof(struct se_ua), __alignof__(struct se_ua),
117 0, NULL);
6708bb27
AG		 118 if (!se_ua_cache) {
119 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 120 goto out_free_sess_cache;
c66ac9db 121 }
c66ac9db
NB		 122 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
123 sizeof(struct t10_pr_registration),
124 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 125 if (!t10_pr_reg_cache) {
126 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 127 " failed\n");
35e0e757 128 goto out_free_ua_cache;
c66ac9db
NB		 129 }
130 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
131 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
132 0, NULL);
6708bb27
AG		 133 if (!t10_alua_lu_gp_cache) {
134 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 135 " failed\n");
35e0e757 136 goto out_free_pr_reg_cache;
c66ac9db
NB		 137 }
138 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
139 sizeof(struct t10_alua_lu_gp_member),
140 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 141 if (!t10_alua_lu_gp_mem_cache) {
142 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 143 "cache failed\n");
35e0e757 144 goto out_free_lu_gp_cache;
c66ac9db
NB		 145 }
146 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
147 sizeof(struct t10_alua_tg_pt_gp),
148 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 149 if (!t10_alua_tg_pt_gp_cache) {
150 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 151 "cache failed\n");
35e0e757 152 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 153 }
154 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
155 "t10_alua_tg_pt_gp_mem_cache",
156 sizeof(struct t10_alua_tg_pt_gp_member),
157 __alignof__(struct t10_alua_tg_pt_gp_member),
158 0, NULL);
6708bb27
AG		 159 if (!t10_alua_tg_pt_gp_mem_cache) {
160 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 161 "mem_t failed\n");
35e0e757 162 goto out_free_tg_pt_gp_cache;
c66ac9db
NB		 163 }
164
35e0e757
CH		 165 target_completion_wq = alloc_workqueue("target_completion",
166 WQ_MEM_RECLAIM, 0);
167 if (!target_completion_wq)
168 goto out_free_tg_pt_gp_mem_cache;
169
c66ac9db 170 return 0;
35e0e757
CH		 171
172out_free_tg_pt_gp_mem_cache:
173 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
174out_free_tg_pt_gp_cache:
175 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
176out_free_lu_gp_mem_cache:
177 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
178out_free_lu_gp_cache:
179 kmem_cache_destroy(t10_alua_lu_gp_cache);
180out_free_pr_reg_cache:
181 kmem_cache_destroy(t10_pr_reg_cache);
182out_free_ua_cache:
183 kmem_cache_destroy(se_ua_cache);
184out_free_sess_cache:
185 kmem_cache_destroy(se_sess_cache);
186out_free_tmr_req_cache:
187 kmem_cache_destroy(se_tmr_req_cache);
188out_free_cmd_cache:
189 kmem_cache_destroy(se_cmd_cache);
c66ac9db 190out:
e3d6f909 191 return -ENOMEM;
c66ac9db
NB		 192}
193
e3d6f909 194void release_se_kmem_caches(void)
c66ac9db 195{
35e0e757 196 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 197 kmem_cache_destroy(se_cmd_cache);
198 kmem_cache_destroy(se_tmr_req_cache);
199 kmem_cache_destroy(se_sess_cache);
200 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 201 kmem_cache_destroy(t10_pr_reg_cache);
202 kmem_cache_destroy(t10_alua_lu_gp_cache);
203 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
204 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
205 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 206}
207
e3d6f909
AG		 208/* This code ensures unique mib indexes are handed out. */
209static DEFINE_SPINLOCK(scsi_mib_index_lock);
210static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 211
212/*
213 * Allocate a new row index for the entry type specified
214 */
215u32 scsi_get_new_index(scsi_index_t type)
216{
217 u32 new_index;
218
e3d6f909 219 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 220
e3d6f909
AG		 221 spin_lock(&scsi_mib_index_lock);
222 new_index = ++scsi_mib_index[type];
223 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 224
225 return new_index;
226}
227
c66ac9db
NB		 228void transport_init_queue_obj(struct se_queue_obj *qobj)
229{
230 atomic_set(&qobj->queue_cnt, 0);
231 INIT_LIST_HEAD(&qobj->qobj_list);
232 init_waitqueue_head(&qobj->thread_wq);
233 spin_lock_init(&qobj->cmd_queue_lock);
234}
235EXPORT_SYMBOL(transport_init_queue_obj);
236
237static int transport_subsystem_reqmods(void)
238{
239 int ret;
240
241 ret = request_module("target_core_iblock");
242 if (ret != 0)
6708bb27 243 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 244
245 ret = request_module("target_core_file");
246 if (ret != 0)
6708bb27 247 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 248
249 ret = request_module("target_core_pscsi");
250 if (ret != 0)
6708bb27 251 pr_err("Unable to load target_core_pscsi\n");
c66ac9db
NB		 252
253 ret = request_module("target_core_stgt");
254 if (ret != 0)
6708bb27 255 pr_err("Unable to load target_core_stgt\n");
c66ac9db
NB		 256
257 return 0;
258}
259
260int transport_subsystem_check_init(void)
261{
e3d6f909
AG		 262 int ret;
263
264 if (sub_api_initialized)
c66ac9db
NB		 265 return 0;
266 /*
267 * Request the loading of known TCM subsystem plugins..
268 */
e3d6f909
AG		 269 ret = transport_subsystem_reqmods();
270 if (ret < 0)
271 return ret;
c66ac9db 272
e3d6f909 273 sub_api_initialized = 1;
c66ac9db
NB		 274 return 0;
275}
276
277struct se_session *transport_init_session(void)
278{
279 struct se_session *se_sess;
280
281 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 282 if (!se_sess) {
283 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 284 " se_sess_cache\n");
285 return ERR_PTR(-ENOMEM);
286 }
287 INIT_LIST_HEAD(&se_sess->sess_list);
288 INIT_LIST_HEAD(&se_sess->sess_acl_list);
c66ac9db
NB		 289
290 return se_sess;
291}
292EXPORT_SYMBOL(transport_init_session);
293
294/*
295 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
296 */
297void __transport_register_session(
298 struct se_portal_group *se_tpg,
299 struct se_node_acl *se_nacl,
300 struct se_session *se_sess,
301 void *fabric_sess_ptr)
302{
303 unsigned char buf[PR_REG_ISID_LEN];
304
305 se_sess->se_tpg = se_tpg;
306 se_sess->fabric_sess_ptr = fabric_sess_ptr;
307 /*
308 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
309 *
310 * Only set for struct se_session's that will actually be moving I/O.
311 * eg: *NOT* discovery sessions.
312 */
313 if (se_nacl) {
314 /*
315 * If the fabric module supports an ISID based TransportID,
316 * save this value in binary from the fabric I_T Nexus now.
317 */
e3d6f909 318 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 319 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 320 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 321 &buf[0], PR_REG_ISID_LEN);
322 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
323 }
324 spin_lock_irq(&se_nacl->nacl_sess_lock);
325 /*
326 * The se_nacl->nacl_sess pointer will be set to the
327 * last active I_T Nexus for each struct se_node_acl.
328 */
329 se_nacl->nacl_sess = se_sess;
330
331 list_add_tail(&se_sess->sess_acl_list,
332 &se_nacl->acl_sess_list);
333 spin_unlock_irq(&se_nacl->nacl_sess_lock);
334 }
335 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
336
6708bb27 337 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 338 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 339}
340EXPORT_SYMBOL(__transport_register_session);
341
342void transport_register_session(
343 struct se_portal_group *se_tpg,
344 struct se_node_acl *se_nacl,
345 struct se_session *se_sess,
346 void *fabric_sess_ptr)
347{
348 spin_lock_bh(&se_tpg->session_lock);
349 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
350 spin_unlock_bh(&se_tpg->session_lock);
351}
352EXPORT_SYMBOL(transport_register_session);
353
354void transport_deregister_session_configfs(struct se_session *se_sess)
355{
356 struct se_node_acl *se_nacl;
23388864 357 unsigned long flags;
c66ac9db
NB		 358 /*
359 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
360 */
361 se_nacl = se_sess->se_node_acl;
6708bb27 362 if (se_nacl) {
23388864 363 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 364 list_del(&se_sess->sess_acl_list);
365 /*
366 * If the session list is empty, then clear the pointer.
367 * Otherwise, set the struct se_session pointer from the tail
368 * element of the per struct se_node_acl active session list.
369 */
370 if (list_empty(&se_nacl->acl_sess_list))
371 se_nacl->nacl_sess = NULL;
372 else {
373 se_nacl->nacl_sess = container_of(
374 se_nacl->acl_sess_list.prev,
375 struct se_session, sess_acl_list);
376 }
23388864 377 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 378 }
379}
380EXPORT_SYMBOL(transport_deregister_session_configfs);
381
382void transport_free_session(struct se_session *se_sess)
383{
384 kmem_cache_free(se_sess_cache, se_sess);
385}
386EXPORT_SYMBOL(transport_free_session);
387
388void transport_deregister_session(struct se_session *se_sess)
389{
390 struct se_portal_group *se_tpg = se_sess->se_tpg;
391 struct se_node_acl *se_nacl;
e63a8e19 392 unsigned long flags;
c66ac9db 393
6708bb27 394 if (!se_tpg) {
c66ac9db
NB		 395 transport_free_session(se_sess);
396 return;
397 }
c66ac9db 398
e63a8e19 399 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 400 list_del(&se_sess->sess_list);
401 se_sess->se_tpg = NULL;
402 se_sess->fabric_sess_ptr = NULL;
e63a8e19 403 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 404
405 /*
406 * Determine if we need to do extra work for this initiator node's
407 * struct se_node_acl if it had been previously dynamically generated.
408 */
409 se_nacl = se_sess->se_node_acl;
6708bb27 410 if (se_nacl) {
e63a8e19 411 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 412 if (se_nacl->dynamic_node_acl) {
6708bb27
AG		 413 if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
414 se_tpg)) {
c66ac9db
NB		 415 list_del(&se_nacl->acl_list);
416 se_tpg->num_node_acls--;
e63a8e19 417 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 418
419 core_tpg_wait_for_nacl_pr_ref(se_nacl);
c66ac9db 420 core_free_device_list_for_node(se_nacl, se_tpg);
e3d6f909 421 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
c66ac9db 422 se_nacl);
e63a8e19 423 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 424 }
425 }
e63a8e19 426 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 427 }
428
429 transport_free_session(se_sess);
430
6708bb27 431 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 432 se_tpg->se_tpg_tfo->get_fabric_name());
c66ac9db
NB		 433}
434EXPORT_SYMBOL(transport_deregister_session);
435
436/*
a1d8b49a 437 * Called with cmd->t_state_lock held.
c66ac9db
NB		 438 */
439static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
440{
42bf829e 441 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 442 struct se_task *task;
443 unsigned long flags;
444
42bf829e
CH		 445 if (!dev)
446 return;
c66ac9db 447
42bf829e 448 list_for_each_entry(task, &cmd->t_task_list, t_list) {
6c76bf95 449 if (task->task_flags & TF_ACTIVE)
c66ac9db
NB		 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 490
a1d8b49a 491 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 492 if (transport_off == 2)
493 transport_all_task_dev_remove_state(cmd);
a1d8b49a 494 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 495
a1d8b49a 496 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 497 return 1;
498 }
499 /*
500 * Determine if frontend context caller is requesting the stopping of
e3d6f909 501 * this command for frontend exceptions.
c66ac9db 502 */
a1d8b49a 503 if (atomic_read(&cmd->t_transport_stop)) {
6708bb27 504 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
c66ac9db 505 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 506 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 507
c66ac9db
NB		 508 if (transport_off == 2)
509 transport_all_task_dev_remove_state(cmd);
510
511 /*
512 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
513 * to FE.
514 */
515 if (transport_off == 2)
516 cmd->se_lun = NULL;
a1d8b49a 517 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 518
a1d8b49a 519 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 520 return 1;
521 }
522 if (transport_off) {
a1d8b49a 523 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 524 if (transport_off == 2) {
525 transport_all_task_dev_remove_state(cmd);
526 /*
527 * Clear struct se_cmd->se_lun before the transport_off == 2
528 * handoff to fabric module.
529 */
530 cmd->se_lun = NULL;
531 /*
532 * Some fabric modules like tcm_loop can release
25985edc 533 * their internally allocated I/O reference now and
c66ac9db
NB		 534 * struct se_cmd now.
535 */
e3d6f909 536 if (cmd->se_tfo->check_stop_free != NULL) {
c66ac9db 537 spin_unlock_irqrestore(
a1d8b49a 538 &cmd->t_state_lock, flags);
c66ac9db 539
e3d6f909 540 cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 541 return 1;
542 }
543 }
a1d8b49a 544 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 545
546 return 0;
547 } else if (t_state)
548 cmd->t_state = t_state;
a1d8b49a 549 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 550
551 return 0;
552}
553
554static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
555{
556 return transport_cmd_check_stop(cmd, 2, 0);
557}
558
559static void transport_lun_remove_cmd(struct se_cmd *cmd)
560{
e3d6f909 561 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 562 unsigned long flags;
563
564 if (!lun)
565 return;
566
a1d8b49a 567 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 568 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 569 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 570 goto check_lun;
571 }
a1d8b49a 572 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 573 transport_all_task_dev_remove_state(cmd);
a1d8b49a 574 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 575
c66ac9db
NB		 576
577check_lun:
578 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
a1d8b49a 579 if (atomic_read(&cmd->transport_lun_active)) {
5951146d 580 list_del(&cmd->se_lun_node);
a1d8b49a 581 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db 582#if 0
6708bb27 583 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
e3d6f909 584 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
c66ac9db
NB		 585#endif
586 }
587 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
588}
589
590void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
591{
8dc52b54
NB		 592 if (!cmd->se_tmr_req)
593 transport_lun_remove_cmd(cmd);
c66ac9db
NB		 594
595 if (transport_cmd_check_stop_to_fabric(cmd))
596 return;
77039d1e 597 if (remove) {
3df8d40b 598 transport_remove_cmd_from_queue(cmd);
e6a2573f 599 transport_put_cmd(cmd);
77039d1e 600 }
c66ac9db
NB		 601}
602
f7a5cc0b
CH		 603static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
604 bool at_head)
c66ac9db
NB		 605{
606 struct se_device *dev = cmd->se_dev;
e3d6f909 607 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 608 unsigned long flags;
609
c66ac9db 610 if (t_state) {
a1d8b49a 611 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 612 cmd->t_state = t_state;
a1d8b49a
AG		 613 atomic_set(&cmd->t_transport_active, 1);
614 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 615 }
616
617 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
79a7fef2
RD		 618
619 /* If the cmd is already on the list, remove it before we add it */
620 if (!list_empty(&cmd->se_queue_node))
621 list_del(&cmd->se_queue_node);
622 else
623 atomic_inc(&qobj->queue_cnt);
624
f7a5cc0b 625 if (at_head)
07bde79a 626 list_add(&cmd->se_queue_node, &qobj->qobj_list);
f7a5cc0b 627 else
07bde79a 628 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
79a7fef2 629 atomic_set(&cmd->t_transport_queue_active, 1);
c66ac9db
NB		 630 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
631
c66ac9db 632 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 633}
634
5951146d
AG		 635static struct se_cmd *
636transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 637{
5951146d 638 struct se_cmd *cmd;
c66ac9db
NB		 639 unsigned long flags;
640
641 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
642 if (list_empty(&qobj->qobj_list)) {
643 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
644 return NULL;
645 }
5951146d 646 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 647
79a7fef2 648 atomic_set(&cmd->t_transport_queue_active, 0);
c66ac9db 649
79a7fef2 650 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 651 atomic_dec(&qobj->queue_cnt);
652 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
653
5951146d 654 return cmd;
c66ac9db
NB		 655}
656
3df8d40b 657static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
c66ac9db 658{
3df8d40b 659 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
c66ac9db
NB		 660 unsigned long flags;
661
662 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
6708bb27 663 if (!atomic_read(&cmd->t_transport_queue_active)) {
c66ac9db
NB		 664 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
665 return;
666 }
79a7fef2
RD		 667 atomic_set(&cmd->t_transport_queue_active, 0);
668 atomic_dec(&qobj->queue_cnt);
669 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 670 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
671
a1d8b49a 672 if (atomic_read(&cmd->t_transport_queue_active)) {
6708bb27 673 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
e3d6f909 674 cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 675 atomic_read(&cmd->t_transport_queue_active));
c66ac9db
NB		 676 }
677}
678
679/*
680 * Completion function used by TCM subsystem plugins (such as FILEIO)
681 * for queueing up response from struct se_subsystem_api->do_task()
682 */
683void transport_complete_sync_cache(struct se_cmd *cmd, int good)
684{
a1d8b49a 685 struct se_task *task = list_entry(cmd->t_task_list.next,
c66ac9db
NB		 686 struct se_task, t_list);
687
688 if (good) {
689 cmd->scsi_status = SAM_STAT_GOOD;
690 task->task_scsi_status = GOOD;
691 } else {
692 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
693 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
e3d6f909 694 task->task_se_cmd->transport_error_status =
c66ac9db
NB		 695 PYX_TRANSPORT_ILLEGAL_REQUEST;
696 }
697
698 transport_complete_task(task, good);
699}
700EXPORT_SYMBOL(transport_complete_sync_cache);
701
35e0e757
CH		 702static void target_complete_timeout_work(struct work_struct *work)
703{
704 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
705 unsigned long flags;
706
707 /*
708 * Reset cmd->t_se_count to allow transport_put_cmd()
709 * to allow last call to free memory resources.
710 */
711 spin_lock_irqsave(&cmd->t_state_lock, flags);
712 if (atomic_read(&cmd->t_transport_timeout) > 1) {
713 int tmp = (atomic_read(&cmd->t_transport_timeout) - 1);
714
715 atomic_sub(tmp, &cmd->t_se_count);
716 }
717 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
718
719 transport_put_cmd(cmd);
720}
721
722static void target_complete_failure_work(struct work_struct *work)
723{
724 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
725
726 transport_generic_request_failure(cmd, 1, 1);
727}
728
c66ac9db
NB		 729/* transport_complete_task():
730 *
731 * Called from interrupt and non interrupt context depending
732 * on the transport plugin.
733 */
734void transport_complete_task(struct se_task *task, int success)
735{
e3d6f909 736 struct se_cmd *cmd = task->task_se_cmd;
42bf829e 737 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 738 unsigned long flags;
739#if 0
6708bb27 740 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
a1d8b49a 741 cmd->t_task_cdb[0], dev);
c66ac9db 742#endif
e3d6f909 743 if (dev)
c66ac9db 744 atomic_inc(&dev->depth_left);
c66ac9db 745
cc5d0f0f
CH		 746 del_timer(&task->task_timer);
747
a1d8b49a 748 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 749 task->task_flags &= ~TF_ACTIVE;
c66ac9db
NB		 750
751 /*
752 * See if any sense data exists, if so set the TASK_SENSE flag.
753 * Also check for any other post completion work that needs to be
754 * done by the plugins.
755 */
756 if (dev && dev->transport->transport_complete) {
757 if (dev->transport->transport_complete(task) != 0) {
758 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
759 task->task_sense = 1;
760 success = 1;
761 }
762 }
763
764 /*
765 * See if we are waiting for outstanding struct se_task
766 * to complete for an exception condition
767 */
6c76bf95 768 if (task->task_flags & TF_REQUEST_STOP) {
c66ac9db 769 /*
a1d8b49a 770 * Decrement cmd->t_se_count if this task had
c66ac9db
NB		 771 * previously thrown its timeout exception handler.
772 */
6c76bf95 773 if (task->task_flags & TF_TIMEOUT) {
a1d8b49a 774 atomic_dec(&cmd->t_se_count);
6c76bf95 775 task->task_flags &= ~TF_TIMEOUT;
c66ac9db 776 }
a1d8b49a 777 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 778
779 complete(&task->task_stop_comp);
780 return;
781 }
782 /*
783 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
784 * left counter to determine when the struct se_cmd is ready to be queued to
785 * the processing thread.
786 */
6c76bf95 787 if (task->task_flags & TF_TIMEOUT) {
35e0e757
CH		 788 if (!atomic_dec_and_test(&cmd->t_task_cdbs_timeout_left)) {
789 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 790 return;
791 }
35e0e757
CH		 792 INIT_WORK(&cmd->work, target_complete_timeout_work);
793 goto out_queue;
c66ac9db 794 }
a1d8b49a 795 atomic_dec(&cmd->t_task_cdbs_timeout_left);
c66ac9db
NB		 796
797 /*
798 * Decrement the outstanding t_task_cdbs_left count. The last
799 * struct se_task from struct se_cmd will complete itself into the
800 * device queue depending upon int success.
801 */
6708bb27 802 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
a1d8b49a 803 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 804 return;
805 }
806
a1d8b49a 807 if (!success || cmd->t_tasks_failed) {
c66ac9db
NB		 808 if (!task->task_error_status) {
809 task->task_error_status =
810 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
811 cmd->transport_error_status =
812 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
813 }
35e0e757 814 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 815 } else {
a1d8b49a 816 atomic_set(&cmd->t_transport_complete, 1);
35e0e757 817 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 818 }
35e0e757
CH		 819
820out_queue:
821 cmd->t_state = TRANSPORT_COMPLETE;
822 atomic_set(&cmd->t_transport_active, 1);
a1d8b49a 823 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 824
35e0e757 825 queue_work(target_completion_wq, &cmd->work);
c66ac9db
NB		 826}
827EXPORT_SYMBOL(transport_complete_task);
828
829/*
830 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
831 * struct se_task list are ready to be added to the active execution list
832 * struct se_device
833
834 * Called with se_dev_t->execute_task_lock called.
835 */
836static inline int transport_add_task_check_sam_attr(
837 struct se_task *task,
838 struct se_task *task_prev,
839 struct se_device *dev)
840{
841 /*
842 * No SAM Task attribute emulation enabled, add to tail of
843 * execution queue
844 */
845 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
846 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
847 return 0;
848 }
849 /*
850 * HEAD_OF_QUEUE attribute for received CDB, which means
851 * the first task that is associated with a struct se_cmd goes to
852 * head of the struct se_device->execute_task_list, and task_prev
853 * after that for each subsequent task
854 */
e66ecd50 855 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 856 list_add(&task->t_execute_list,
857 (task_prev != NULL) ?
858 &task_prev->t_execute_list :
859 &dev->execute_task_list);
860
6708bb27 861 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
c66ac9db 862 " in execution queue\n",
6708bb27 863 task->task_se_cmd->t_task_cdb[0]);
c66ac9db
NB		 864 return 1;
865 }
866 /*
867 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
868 * transitioned from Dermant -> Active state, and are added to the end
869 * of the struct se_device->execute_task_list
870 */
871 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
872 return 0;
873}
874
875/* __transport_add_task_to_execute_queue():
876 *
877 * Called with se_dev_t->execute_task_lock called.
878 */
879static void __transport_add_task_to_execute_queue(
880 struct se_task *task,
881 struct se_task *task_prev,
882 struct se_device *dev)
883{
884 int head_of_queue;
885
886 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
887 atomic_inc(&dev->execute_tasks);
888
889 if (atomic_read(&task->task_state_active))
890 return;
891 /*
892 * Determine if this task needs to go to HEAD_OF_QUEUE for the
893 * state list as well. Running with SAM Task Attribute emulation
894 * will always return head_of_queue == 0 here
895 */
896 if (head_of_queue)
897 list_add(&task->t_state_list, (task_prev) ?
898 &task_prev->t_state_list :
899 &dev->state_task_list);
900 else
901 list_add_tail(&task->t_state_list, &dev->state_task_list);
902
903 atomic_set(&task->task_state_active, 1);
904
6708bb27 905 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
e3d6f909 906 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
c66ac9db
NB		 907 task, dev);
908}
909
910static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
911{
42bf829e 912 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 913 struct se_task *task;
914 unsigned long flags;
915
a1d8b49a
AG		 916 spin_lock_irqsave(&cmd->t_state_lock, flags);
917 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 918 if (atomic_read(&task->task_state_active))
919 continue;
920
921 spin_lock(&dev->execute_task_lock);
922 list_add_tail(&task->t_state_list, &dev->state_task_list);
923 atomic_set(&task->task_state_active, 1);
924
6708bb27
AG		 925 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
926 task->task_se_cmd->se_tfo->get_task_tag(
c66ac9db
NB		 927 task->task_se_cmd), task, dev);
928
929 spin_unlock(&dev->execute_task_lock);
930 }
a1d8b49a 931 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 932}
933
934static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
935{
5951146d 936 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 937 struct se_task *task, *task_prev = NULL;
938 unsigned long flags;
939
940 spin_lock_irqsave(&dev->execute_task_lock, flags);
a1d8b49a 941 list_for_each_entry(task, &cmd->t_task_list, t_list) {
04629b7b 942 if (!list_empty(&task->t_execute_list))
c66ac9db
NB		 943 continue;
944 /*
945 * __transport_add_task_to_execute_queue() handles the
946 * SAM Task Attribute emulation if enabled
947 */
948 __transport_add_task_to_execute_queue(task, task_prev, dev);
c66ac9db
NB		 949 task_prev = task;
950 }
951 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 952}
953
04629b7b
CH		 954void __transport_remove_task_from_execute_queue(struct se_task *task,
955 struct se_device *dev)
956{
957 list_del_init(&task->t_execute_list);
958 atomic_dec(&dev->execute_tasks);
959}
960
52208ae3 961void transport_remove_task_from_execute_queue(
c66ac9db
NB		 962 struct se_task *task,
963 struct se_device *dev)
964{
965 unsigned long flags;
966
04629b7b 967 if (WARN_ON(list_empty(&task->t_execute_list)))
af57c3ac 968 return;
af57c3ac 969
c66ac9db 970 spin_lock_irqsave(&dev->execute_task_lock, flags);
04629b7b 971 __transport_remove_task_from_execute_queue(task, dev);
c66ac9db
NB		 972 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
973}
974
07bde79a
NB		 975/*
976 * Handle QUEUE_FULL / -EAGAIN status
977 */
978
979static void target_qf_do_work(struct work_struct *work)
980{
981 struct se_device *dev = container_of(work, struct se_device,
982 qf_work_queue);
bcac364a 983 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 984 struct se_cmd *cmd, *cmd_tmp;
985
986 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 987 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
988 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 989
bcac364a 990 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 991 list_del(&cmd->se_qf_node);
992 atomic_dec(&dev->dev_qf_count);
993 smp_mb__after_atomic_dec();
07bde79a 994
6708bb27 995 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 996 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 997 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 998 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
999 : "UNKNOWN");
f7a5cc0b
CH		 1000
1001 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
07bde79a 1002 }
07bde79a
NB		 1003}
1004
c66ac9db
NB		 1005unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
1006{
1007 switch (cmd->data_direction) {
1008 case DMA_NONE:
1009 return "NONE";
1010 case DMA_FROM_DEVICE:
1011 return "READ";
1012 case DMA_TO_DEVICE:
1013 return "WRITE";
1014 case DMA_BIDIRECTIONAL:
1015 return "BIDI";
1016 default:
1017 break;
1018 }
1019
1020 return "UNKNOWN";
1021}
1022
1023void transport_dump_dev_state(
1024 struct se_device *dev,
1025 char *b,
1026 int *bl)
1027{
1028 *bl += sprintf(b + *bl, "Status: ");
1029 switch (dev->dev_status) {
1030 case TRANSPORT_DEVICE_ACTIVATED:
1031 *bl += sprintf(b + *bl, "ACTIVATED");
1032 break;
1033 case TRANSPORT_DEVICE_DEACTIVATED:
1034 *bl += sprintf(b + *bl, "DEACTIVATED");
1035 break;
1036 case TRANSPORT_DEVICE_SHUTDOWN:
1037 *bl += sprintf(b + *bl, "SHUTDOWN");
1038 break;
1039 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
1040 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
1041 *bl += sprintf(b + *bl, "OFFLINE");
1042 break;
1043 default:
1044 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
1045 break;
1046 }
1047
1048 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
1049 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
1050 dev->queue_depth);
1051 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
e3d6f909 1052 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db
NB		 1053 *bl += sprintf(b + *bl, " ");
1054}
1055
c66ac9db
NB		 1056void transport_dump_vpd_proto_id(
1057 struct t10_vpd *vpd,
1058 unsigned char *p_buf,
1059 int p_buf_len)
1060{
1061 unsigned char buf[VPD_TMP_BUF_SIZE];
1062 int len;
1063
1064 memset(buf, 0, VPD_TMP_BUF_SIZE);
1065 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1066
1067 switch (vpd->protocol_identifier) {
1068 case 0x00:
1069 sprintf(buf+len, "Fibre Channel\n");
1070 break;
1071 case 0x10:
1072 sprintf(buf+len, "Parallel SCSI\n");
1073 break;
1074 case 0x20:
1075 sprintf(buf+len, "SSA\n");
1076 break;
1077 case 0x30:
1078 sprintf(buf+len, "IEEE 1394\n");
1079 break;
1080 case 0x40:
1081 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1082 " Protocol\n");
1083 break;
1084 case 0x50:
1085 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1086 break;
1087 case 0x60:
1088 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1089 break;
1090 case 0x70:
1091 sprintf(buf+len, "Automation/Drive Interface Transport"
1092 " Protocol\n");
1093 break;
1094 case 0x80:
1095 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1096 break;
1097 default:
1098 sprintf(buf+len, "Unknown 0x%02x\n",
1099 vpd->protocol_identifier);
1100 break;
1101 }
1102
1103 if (p_buf)
1104 strncpy(p_buf, buf, p_buf_len);
1105 else
6708bb27 1106 pr_debug("%s", buf);
c66ac9db
NB		 1107}
1108
1109void
1110transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1111{
1112 /*
1113 * Check if the Protocol Identifier Valid (PIV) bit is set..
1114 *
1115 * from spc3r23.pdf section 7.5.1
1116 */
1117 if (page_83[1] & 0x80) {
1118 vpd->protocol_identifier = (page_83[0] & 0xf0);
1119 vpd->protocol_identifier_set = 1;
1120 transport_dump_vpd_proto_id(vpd, NULL, 0);
1121 }
1122}
1123EXPORT_SYMBOL(transport_set_vpd_proto_id);
1124
1125int transport_dump_vpd_assoc(
1126 struct t10_vpd *vpd,
1127 unsigned char *p_buf,
1128 int p_buf_len)
1129{
1130 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1131 int ret = 0;
1132 int len;
c66ac9db
NB		 1133
1134 memset(buf, 0, VPD_TMP_BUF_SIZE);
1135 len = sprintf(buf, "T10 VPD Identifier Association: ");
1136
1137 switch (vpd->association) {
1138 case 0x00:
1139 sprintf(buf+len, "addressed logical unit\n");
1140 break;
1141 case 0x10:
1142 sprintf(buf+len, "target port\n");
1143 break;
1144 case 0x20:
1145 sprintf(buf+len, "SCSI target device\n");
1146 break;
1147 default:
1148 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 1149 ret = -EINVAL;
c66ac9db
NB		 1150 break;
1151 }
1152
1153 if (p_buf)
1154 strncpy(p_buf, buf, p_buf_len);
1155 else
6708bb27 1156 pr_debug("%s", buf);
c66ac9db
NB		 1157
1158 return ret;
1159}
1160
1161int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1162{
1163 /*
1164 * The VPD identification association..
1165 *
1166 * from spc3r23.pdf Section 7.6.3.1 Table 297
1167 */
1168 vpd->association = (page_83[1] & 0x30);
1169 return transport_dump_vpd_assoc(vpd, NULL, 0);
1170}
1171EXPORT_SYMBOL(transport_set_vpd_assoc);
1172
1173int transport_dump_vpd_ident_type(
1174 struct t10_vpd *vpd,
1175 unsigned char *p_buf,
1176 int p_buf_len)
1177{
1178 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1179 int ret = 0;
1180 int len;
c66ac9db
NB		 1181
1182 memset(buf, 0, VPD_TMP_BUF_SIZE);
1183 len = sprintf(buf, "T10 VPD Identifier Type: ");
1184
1185 switch (vpd->device_identifier_type) {
1186 case 0x00:
1187 sprintf(buf+len, "Vendor specific\n");
1188 break;
1189 case 0x01:
1190 sprintf(buf+len, "T10 Vendor ID based\n");
1191 break;
1192 case 0x02:
1193 sprintf(buf+len, "EUI-64 based\n");
1194 break;
1195 case 0x03:
1196 sprintf(buf+len, "NAA\n");
1197 break;
1198 case 0x04:
1199 sprintf(buf+len, "Relative target port identifier\n");
1200 break;
1201 case 0x08:
1202 sprintf(buf+len, "SCSI name string\n");
1203 break;
1204 default:
1205 sprintf(buf+len, "Unsupported: 0x%02x\n",
1206 vpd->device_identifier_type);
e3d6f909 1207 ret = -EINVAL;
c66ac9db
NB		 1208 break;
1209 }
1210
e3d6f909
AG		 1211 if (p_buf) {
1212 if (p_buf_len < strlen(buf)+1)
1213 return -EINVAL;
c66ac9db 1214 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1215 } else {
6708bb27 1216 pr_debug("%s", buf);
e3d6f909 1217 }
c66ac9db
NB		 1218
1219 return ret;
1220}
1221
1222int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1223{
1224 /*
1225 * The VPD identifier type..
1226 *
1227 * from spc3r23.pdf Section 7.6.3.1 Table 298
1228 */
1229 vpd->device_identifier_type = (page_83[1] & 0x0f);
1230 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1231}
1232EXPORT_SYMBOL(transport_set_vpd_ident_type);
1233
1234int transport_dump_vpd_ident(
1235 struct t10_vpd *vpd,
1236 unsigned char *p_buf,
1237 int p_buf_len)
1238{
1239 unsigned char buf[VPD_TMP_BUF_SIZE];
1240 int ret = 0;
1241
1242 memset(buf, 0, VPD_TMP_BUF_SIZE);
1243
1244 switch (vpd->device_identifier_code_set) {
1245 case 0x01: /* Binary */
1246 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1247 &vpd->device_identifier[0]);
1248 break;
1249 case 0x02: /* ASCII */
1250 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1251 &vpd->device_identifier[0]);
1252 break;
1253 case 0x03: /* UTF-8 */
1254 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1255 &vpd->device_identifier[0]);
1256 break;
1257 default:
1258 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1259 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1260 ret = -EINVAL;
c66ac9db
NB		 1261 break;
1262 }
1263
1264 if (p_buf)
1265 strncpy(p_buf, buf, p_buf_len);
1266 else
6708bb27 1267 pr_debug("%s", buf);
c66ac9db
NB		 1268
1269 return ret;
1270}
1271
1272int
1273transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1274{
1275 static const char hex_str[] = "0123456789abcdef";
1276 int j = 0, i = 4; /* offset to start of the identifer */
1277
1278 /*
1279 * The VPD Code Set (encoding)
1280 *
1281 * from spc3r23.pdf Section 7.6.3.1 Table 296
1282 */
1283 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1284 switch (vpd->device_identifier_code_set) {
1285 case 0x01: /* Binary */
1286 vpd->device_identifier[j++] =
1287 hex_str[vpd->device_identifier_type];
1288 while (i < (4 + page_83[3])) {
1289 vpd->device_identifier[j++] =
1290 hex_str[(page_83[i] & 0xf0) >> 4];
1291 vpd->device_identifier[j++] =
1292 hex_str[page_83[i] & 0x0f];
1293 i++;
1294 }
1295 break;
1296 case 0x02: /* ASCII */
1297 case 0x03: /* UTF-8 */
1298 while (i < (4 + page_83[3]))
1299 vpd->device_identifier[j++] = page_83[i++];
1300 break;
1301 default:
1302 break;
1303 }
1304
1305 return transport_dump_vpd_ident(vpd, NULL, 0);
1306}
1307EXPORT_SYMBOL(transport_set_vpd_ident);
1308
1309static void core_setup_task_attr_emulation(struct se_device *dev)
1310{
1311 /*
1312 * If this device is from Target_Core_Mod/pSCSI, disable the
1313 * SAM Task Attribute emulation.
1314 *
1315 * This is currently not available in upsream Linux/SCSI Target
1316 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1317 */
e3d6f909 1318 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1319 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1320 return;
1321 }
1322
1323 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1324 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1325 " device\n", dev->transport->name,
1326 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1327}
1328
1329static void scsi_dump_inquiry(struct se_device *dev)
1330{
e3d6f909 1331 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
c66ac9db
NB		 1332 int i, device_type;
1333 /*
1334 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1335 */
6708bb27 1336 pr_debug(" Vendor: ");
c66ac9db
NB		 1337 for (i = 0; i < 8; i++)
1338 if (wwn->vendor[i] >= 0x20)
6708bb27 1339 pr_debug("%c", wwn->vendor[i]);
c66ac9db 1340 else
6708bb27 1341 pr_debug(" ");
c66ac9db 1342
6708bb27 1343 pr_debug(" Model: ");
c66ac9db
NB		 1344 for (i = 0; i < 16; i++)
1345 if (wwn->model[i] >= 0x20)
6708bb27 1346 pr_debug("%c", wwn->model[i]);
c66ac9db 1347 else
6708bb27 1348 pr_debug(" ");
c66ac9db 1349
6708bb27 1350 pr_debug(" Revision: ");
c66ac9db
NB		 1351 for (i = 0; i < 4; i++)
1352 if (wwn->revision[i] >= 0x20)
6708bb27 1353 pr_debug("%c", wwn->revision[i]);
c66ac9db 1354 else
6708bb27 1355 pr_debug(" ");
c66ac9db 1356
6708bb27 1357 pr_debug("\n");
c66ac9db 1358
e3d6f909 1359 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1360 pr_debug(" Type: %s ", scsi_device_type(device_type));
1361 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1362 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1363}
1364
1365struct se_device *transport_add_device_to_core_hba(
1366 struct se_hba *hba,
1367 struct se_subsystem_api *transport,
1368 struct se_subsystem_dev *se_dev,
1369 u32 device_flags,
1370 void *transport_dev,
1371 struct se_dev_limits *dev_limits,
1372 const char *inquiry_prod,
1373 const char *inquiry_rev)
1374{
12a18bdc 1375 int force_pt;
c66ac9db
NB		 1376 struct se_device *dev;
1377
1378 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1379 if (!dev) {
1380 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1381 return NULL;
1382 }
c66ac9db 1383
e3d6f909 1384 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1385 dev->dev_flags = device_flags;
1386 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1387 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1388 dev->se_hba = hba;
1389 dev->se_sub_dev = se_dev;
1390 dev->transport = transport;
1391 atomic_set(&dev->active_cmds, 0);
1392 INIT_LIST_HEAD(&dev->dev_list);
1393 INIT_LIST_HEAD(&dev->dev_sep_list);
1394 INIT_LIST_HEAD(&dev->dev_tmr_list);
1395 INIT_LIST_HEAD(&dev->execute_task_list);
1396 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1397 INIT_LIST_HEAD(&dev->ordered_cmd_list);
1398 INIT_LIST_HEAD(&dev->state_task_list);
07bde79a 1399 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1400 spin_lock_init(&dev->execute_task_lock);
1401 spin_lock_init(&dev->delayed_cmd_lock);
1402 spin_lock_init(&dev->ordered_cmd_lock);
1403 spin_lock_init(&dev->state_task_lock);
1404 spin_lock_init(&dev->dev_alua_lock);
1405 spin_lock_init(&dev->dev_reservation_lock);
1406 spin_lock_init(&dev->dev_status_lock);
1407 spin_lock_init(&dev->dev_status_thr_lock);
1408 spin_lock_init(&dev->se_port_lock);
1409 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1410 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1411
1412 dev->queue_depth = dev_limits->queue_depth;
1413 atomic_set(&dev->depth_left, dev->queue_depth);
1414 atomic_set(&dev->dev_ordered_id, 0);
1415
1416 se_dev_set_default_attribs(dev, dev_limits);
1417
1418 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1419 dev->creation_time = get_jiffies_64();
1420 spin_lock_init(&dev->stats_lock);
1421
1422 spin_lock(&hba->device_lock);
1423 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1424 hba->dev_count++;
1425 spin_unlock(&hba->device_lock);
1426 /*
1427 * Setup the SAM Task Attribute emulation for struct se_device
1428 */
1429 core_setup_task_attr_emulation(dev);
1430 /*
1431 * Force PR and ALUA passthrough emulation with internal object use.
1432 */
1433 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1434 /*
1435 * Setup the Reservations infrastructure for struct se_device
1436 */
1437 core_setup_reservations(dev, force_pt);
1438 /*
1439 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1440 */
1441 if (core_setup_alua(dev, force_pt) < 0)
1442 goto out;
1443
1444 /*
1445 * Startup the struct se_device processing thread
1446 */
1447 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1448 "LIO_%s", dev->transport->name);
c66ac9db 1449 if (IS_ERR(dev->process_thread)) {
6708bb27 1450 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1451 dev->transport->name);
c66ac9db
NB		 1452 goto out;
1453 }
07bde79a
NB		 1454 /*
1455 * Setup work_queue for QUEUE_FULL
1456 */
1457 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1458 /*
1459 * Preload the initial INQUIRY const values if we are doing
1460 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1461 * passthrough because this is being provided by the backend LLD.
1462 * This is required so that transport_get_inquiry() copies these
1463 * originals once back into DEV_T10_WWN(dev) for the virtual device
1464 * setup.
1465 */
e3d6f909 1466 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1467 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1468 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1469 " INQUIRY consts\n");
1470 goto out;
1471 }
1472
e3d6f909
AG		 1473 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1474 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1475 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1476 }
1477 scsi_dump_inquiry(dev);
1478
12a18bdc 1479 return dev;
c66ac9db 1480out:
c66ac9db
NB		 1481 kthread_stop(dev->process_thread);
1482
1483 spin_lock(&hba->device_lock);
1484 list_del(&dev->dev_list);
1485 hba->dev_count--;
1486 spin_unlock(&hba->device_lock);
1487
1488 se_release_vpd_for_dev(dev);
1489
c66ac9db
NB		 1490 kfree(dev);
1491
1492 return NULL;
1493}
1494EXPORT_SYMBOL(transport_add_device_to_core_hba);
1495
1496/* transport_generic_prepare_cdb():
1497 *
1498 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1499 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1500 * The point of this is since we are mapping iSCSI LUNs to
1501 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1502 * devices and HBAs for a loop.
1503 */
1504static inline void transport_generic_prepare_cdb(
1505 unsigned char *cdb)
1506{
1507 switch (cdb[0]) {
1508 case READ_10: /* SBC - RDProtect */
1509 case READ_12: /* SBC - RDProtect */
1510 case READ_16: /* SBC - RDProtect */
1511 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1512 case VERIFY: /* SBC - VRProtect */
1513 case VERIFY_16: /* SBC - VRProtect */
1514 case WRITE_VERIFY: /* SBC - VRProtect */
1515 case WRITE_VERIFY_12: /* SBC - VRProtect */
1516 break;
1517 default:
1518 cdb[1] &= 0x1f; /* clear logical unit number */
1519 break;
1520 }
1521}
1522
1523static struct se_task *
1524transport_generic_get_task(struct se_cmd *cmd,
1525 enum dma_data_direction data_direction)
1526{
1527 struct se_task *task;
5951146d 1528 struct se_device *dev = cmd->se_dev;
c66ac9db 1529
6708bb27 1530 task = dev->transport->alloc_task(cmd->t_task_cdb);
c66ac9db 1531 if (!task) {
6708bb27 1532 pr_err("Unable to allocate struct se_task\n");
c66ac9db
NB		 1533 return NULL;
1534 }
1535
1536 INIT_LIST_HEAD(&task->t_list);
1537 INIT_LIST_HEAD(&task->t_execute_list);
1538 INIT_LIST_HEAD(&task->t_state_list);
cc5d0f0f 1539 init_timer(&task->task_timer);
c66ac9db 1540 init_completion(&task->task_stop_comp);
c66ac9db 1541 task->task_se_cmd = cmd;
c66ac9db
NB		 1542 task->task_data_direction = data_direction;
1543
c66ac9db
NB		 1544 return task;
1545}
1546
1547static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1548
c66ac9db
NB		 1549/*
1550 * Used by fabric modules containing a local struct se_cmd within their
1551 * fabric dependent per I/O descriptor.
1552 */
1553void transport_init_se_cmd(
1554 struct se_cmd *cmd,
1555 struct target_core_fabric_ops *tfo,
1556 struct se_session *se_sess,
1557 u32 data_length,
1558 int data_direction,
1559 int task_attr,
1560 unsigned char *sense_buffer)
1561{
5951146d
AG		 1562 INIT_LIST_HEAD(&cmd->se_lun_node);
1563 INIT_LIST_HEAD(&cmd->se_delayed_node);
1564 INIT_LIST_HEAD(&cmd->se_ordered_node);
07bde79a 1565 INIT_LIST_HEAD(&cmd->se_qf_node);
79a7fef2 1566 INIT_LIST_HEAD(&cmd->se_queue_node);
c66ac9db 1567
a1d8b49a
AG		 1568 INIT_LIST_HEAD(&cmd->t_task_list);
1569 init_completion(&cmd->transport_lun_fe_stop_comp);
1570 init_completion(&cmd->transport_lun_stop_comp);
1571 init_completion(&cmd->t_transport_stop_comp);
1572 spin_lock_init(&cmd->t_state_lock);
1573 atomic_set(&cmd->transport_dev_active, 1);
c66ac9db
NB		 1574
1575 cmd->se_tfo = tfo;
1576 cmd->se_sess = se_sess;
1577 cmd->data_length = data_length;
1578 cmd->data_direction = data_direction;
1579 cmd->sam_task_attr = task_attr;
1580 cmd->sense_buffer = sense_buffer;
1581}
1582EXPORT_SYMBOL(transport_init_se_cmd);
1583
1584static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1585{
1586 /*
1587 * Check if SAM Task Attribute emulation is enabled for this
1588 * struct se_device storage object
1589 */
5951146d 1590 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1591 return 0;
1592
e66ecd50 1593 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1594 pr_debug("SAM Task Attribute ACA"
c66ac9db 1595 " emulation is not supported\n");
e3d6f909 1596 return -EINVAL;
c66ac9db
NB		 1597 }
1598 /*
1599 * Used to determine when ORDERED commands should go from
1600 * Dormant to Active status.
1601 */
5951146d 1602 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1603 smp_mb__after_atomic_inc();
6708bb27 1604 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1605 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1606 cmd->se_dev->transport->name);
c66ac9db
NB		 1607 return 0;
1608}
1609
c66ac9db
NB		 1610/* transport_generic_allocate_tasks():
1611 *
1612 * Called from fabric RX Thread.
1613 */
1614int transport_generic_allocate_tasks(
1615 struct se_cmd *cmd,
1616 unsigned char *cdb)
1617{
1618 int ret;
1619
1620 transport_generic_prepare_cdb(cdb);
c66ac9db
NB		 1621 /*
1622 * Ensure that the received CDB is less than the max (252 + 8) bytes
1623 * for VARIABLE_LENGTH_CMD
1624 */
1625 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1626 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1627 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1628 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
e3d6f909 1629 return -EINVAL;
c66ac9db
NB		 1630 }
1631 /*
1632 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1633 * allocate the additional extended CDB buffer now.. Otherwise
1634 * setup the pointer from __t_task_cdb to t_task_cdb.
1635 */
a1d8b49a
AG		 1636 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1637 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1638 GFP_KERNEL);
6708bb27
AG		 1639 if (!cmd->t_task_cdb) {
1640 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1641 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1642 scsi_command_size(cdb),
a1d8b49a 1643 (unsigned long)sizeof(cmd->__t_task_cdb));
e3d6f909 1644 return -ENOMEM;
c66ac9db
NB		 1645 }
1646 } else
a1d8b49a 1647 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1648 /*
a1d8b49a 1649 * Copy the original CDB into cmd->
c66ac9db 1650 */
a1d8b49a 1651 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1652 /*
1653 * Setup the received CDB based on SCSI defined opcodes and
1654 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1655 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1656 * pointer is expected to be setup before we reach this point.
1657 */
1658 ret = transport_generic_cmd_sequencer(cmd, cdb);
1659 if (ret < 0)
1660 return ret;
1661 /*
1662 * Check for SAM Task Attribute Emulation
1663 */
1664 if (transport_check_alloc_task_attr(cmd) < 0) {
1665 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1666 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1667 return -EINVAL;
c66ac9db
NB		 1668 }
1669 spin_lock(&cmd->se_lun->lun_sep_lock);
1670 if (cmd->se_lun->lun_sep)
1671 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1672 spin_unlock(&cmd->se_lun->lun_sep_lock);
1673 return 0;
1674}
1675EXPORT_SYMBOL(transport_generic_allocate_tasks);
1676
695434e1
NB		 1677/*
1678 * Used by fabric module frontends to queue tasks directly.
1679 * Many only be used from process context only
1680 */
1681int transport_handle_cdb_direct(
1682 struct se_cmd *cmd)
1683{
dd8ae59d
NB		 1684 int ret;
1685
695434e1
NB		 1686 if (!cmd->se_lun) {
1687 dump_stack();
6708bb27 1688 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1689 return -EINVAL;
1690 }
1691 if (in_interrupt()) {
1692 dump_stack();
6708bb27 1693 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1694 " from interrupt context\n");
1695 return -EINVAL;
1696 }
dd8ae59d
NB		 1697 /*
1698 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1699 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1700 * in existing usage to ensure that outstanding descriptors are handled
d14921d6 1701 * correctly during shutdown via transport_wait_for_tasks()
dd8ae59d
NB		 1702 *
1703 * Also, we don't take cmd->t_state_lock here as we only expect
1704 * this to be called for initial descriptor submission.
1705 */
1706 cmd->t_state = TRANSPORT_NEW_CMD;
1707 atomic_set(&cmd->t_transport_active, 1);
1708 /*
1709 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1710 * so follow TRANSPORT_NEW_CMD processing thread context usage
1711 * and call transport_generic_request_failure() if necessary..
1712 */
1713 ret = transport_generic_new_cmd(cmd);
1714 if (ret == -EAGAIN)
1715 return 0;
1716 else if (ret < 0) {
1717 cmd->transport_error_status = ret;
4499dda8 1718 transport_generic_request_failure(cmd, 0,
dd8ae59d
NB		 1719 (cmd->data_direction != DMA_TO_DEVICE));
1720 }
1721 return 0;
695434e1
NB		 1722}
1723EXPORT_SYMBOL(transport_handle_cdb_direct);
1724
c66ac9db
NB		 1725/*
1726 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1727 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1728 * complete setup in TCM process context w/ TFO->new_cmd_map().
1729 */
1730int transport_generic_handle_cdb_map(
1731 struct se_cmd *cmd)
1732{
e3d6f909 1733 if (!cmd->se_lun) {
c66ac9db 1734 dump_stack();
6708bb27 1735 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1736 return -EINVAL;
c66ac9db
NB		 1737 }
1738
f7a5cc0b 1739 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
c66ac9db
NB		 1740 return 0;
1741}
1742EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1743
1744/* transport_generic_handle_data():
1745 *
1746 *
1747 */
1748int transport_generic_handle_data(
1749 struct se_cmd *cmd)
1750{
1751 /*
1752 * For the software fabric case, then we assume the nexus is being
1753 * failed/shutdown when signals are pending from the kthread context
1754 * caller, so we return a failure. For the HW target mode case running
1755 * in interrupt code, the signal_pending() check is skipped.
1756 */
1757 if (!in_interrupt() && signal_pending(current))
e3d6f909 1758 return -EPERM;
c66ac9db
NB		 1759 /*
1760 * If the received CDB has aleady been ABORTED by the generic
1761 * target engine, we now call transport_check_aborted_status()
1762 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1763 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1764 * sequences at this point.
1765 */
1766 if (transport_check_aborted_status(cmd, 1) != 0)
1767 return 0;
1768
f7a5cc0b 1769 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
c66ac9db
NB		 1770 return 0;
1771}
1772EXPORT_SYMBOL(transport_generic_handle_data);
1773
1774/* transport_generic_handle_tmr():
1775 *
1776 *
1777 */
1778int transport_generic_handle_tmr(
1779 struct se_cmd *cmd)
1780{
f7a5cc0b 1781 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
c66ac9db
NB		 1782 return 0;
1783}
1784EXPORT_SYMBOL(transport_generic_handle_tmr);
1785
f4366772
NB		 1786void transport_generic_free_cmd_intr(
1787 struct se_cmd *cmd)
1788{
f7a5cc0b 1789 transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR, false);
f4366772
NB		 1790}
1791EXPORT_SYMBOL(transport_generic_free_cmd_intr);
1792
cdbb70bb
CH		 1793/*
1794 * If the task is active, request it to be stopped and sleep until it
1795 * has completed.
1796 */
1797bool target_stop_task(struct se_task *task, unsigned long *flags)
1798{
1799 struct se_cmd *cmd = task->task_se_cmd;
1800 bool was_active = false;
1801
1802 if (task->task_flags & TF_ACTIVE) {
1803 task->task_flags |= TF_REQUEST_STOP;
1804 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1805
1806 pr_debug("Task %p waiting to complete\n", task);
cc5d0f0f 1807 del_timer_sync(&task->task_timer);
cdbb70bb
CH		 1808 wait_for_completion(&task->task_stop_comp);
1809 pr_debug("Task %p stopped successfully\n", task);
1810
1811 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1812 atomic_dec(&cmd->t_task_cdbs_left);
1813 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1814 was_active = true;
1815 }
1816
cdbb70bb
CH		 1817 return was_active;
1818}
1819
c66ac9db
NB		 1820static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1821{
1822 struct se_task *task, *task_tmp;
1823 unsigned long flags;
1824 int ret = 0;
1825
6708bb27 1826 pr_debug("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 1827 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 1828
1829 /*
1830 * No tasks remain in the execution queue
1831 */
a1d8b49a 1832 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1833 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 1834 &cmd->t_task_list, t_list) {
04629b7b 1835 pr_debug("Processing task %p\n", task);
c66ac9db
NB		 1836 /*
1837 * If the struct se_task has not been sent and is not active,
1838 * remove the struct se_task from the execution queue.
1839 */
6c76bf95 1840 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
a1d8b49a 1841 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1842 flags);
1843 transport_remove_task_from_execute_queue(task,
42bf829e 1844 cmd->se_dev);
c66ac9db 1845
04629b7b 1846 pr_debug("Task %p removed from execute queue\n", task);
a1d8b49a 1847 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 1848 continue;
1849 }
1850
cdbb70bb 1851 if (!target_stop_task(task, &flags)) {
04629b7b 1852 pr_debug("Task %p - did nothing\n", task);
c66ac9db
NB		 1853 ret++;
1854 }
c66ac9db 1855 }
a1d8b49a 1856 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1857
1858 return ret;
1859}
1860
c66ac9db
NB		 1861/*
1862 * Handle SAM-esque emulation for generic transport request failures.
1863 */
1864static void transport_generic_request_failure(
1865 struct se_cmd *cmd,
c66ac9db
NB		 1866 int complete,
1867 int sc)
1868{
07bde79a
NB		 1869 int ret = 0;
1870
6708bb27 1871 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1872 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1873 cmd->t_task_cdb[0]);
f2da9dbd 1874 pr_debug("-----[ i_state: %d t_state: %d transport_error_status: %d\n",
e3d6f909 1875 cmd->se_tfo->get_cmd_state(cmd),
f2da9dbd 1876 cmd->t_state,
c66ac9db 1877 cmd->transport_error_status);
6708bb27 1878 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
c66ac9db
NB		 1879 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1880 " t_transport_active: %d t_transport_stop: %d"
6708bb27 1881 " t_transport_sent: %d\n", cmd->t_task_list_num,
a1d8b49a
AG		 1882 atomic_read(&cmd->t_task_cdbs_left),
1883 atomic_read(&cmd->t_task_cdbs_sent),
1884 atomic_read(&cmd->t_task_cdbs_ex_left),
1885 atomic_read(&cmd->t_transport_active),
1886 atomic_read(&cmd->t_transport_stop),
1887 atomic_read(&cmd->t_transport_sent));
c66ac9db 1888
c66ac9db
NB		 1889 /*
1890 * For SAM Task Attribute emulation for failed struct se_cmd
1891 */
1892 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1893 transport_complete_task_attr(cmd);
1894
1895 if (complete) {
1896 transport_direct_request_timeout(cmd);
1897 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
1898 }
1899
1900 switch (cmd->transport_error_status) {
1901 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
1902 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1903 break;
1904 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
1905 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
1906 break;
1907 case PYX_TRANSPORT_INVALID_CDB_FIELD:
1908 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1909 break;
1910 case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
1911 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1912 break;
1913 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
1914 if (!sc)
1915 transport_new_cmd_failure(cmd);
1916 /*
1917 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1918 * we force this session to fall back to session
1919 * recovery.
1920 */
e3d6f909
AG		 1921 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
1922 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
c66ac9db
NB		 1923
1924 goto check_stop;
1925 case PYX_TRANSPORT_LU_COMM_FAILURE:
1926 case PYX_TRANSPORT_ILLEGAL_REQUEST:
1927 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1928 break;
1929 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
1930 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
1931 break;
1932 case PYX_TRANSPORT_WRITE_PROTECTED:
1933 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
1934 break;
1935 case PYX_TRANSPORT_RESERVATION_CONFLICT:
1936 /*
1937 * No SENSE Data payload for this case, set SCSI Status
1938 * and queue the response to $FABRIC_MOD.
1939 *
1940 * Uses linux/include/scsi/scsi.h SAM status codes defs
1941 */
1942 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1943 /*
1944 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1945 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1946 * CONFLICT STATUS.
1947 *
1948 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1949 */
e3d6f909
AG		 1950 if (cmd->se_sess &&
1951 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1952 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1953 cmd->orig_fe_lun, 0x2C,
1954 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1955
07bde79a
NB		 1956 ret = cmd->se_tfo->queue_status(cmd);
1957 if (ret == -EAGAIN)
1958 goto queue_full;
c66ac9db
NB		 1959 goto check_stop;
1960 case PYX_TRANSPORT_USE_SENSE_REASON:
1961 /*
1962 * struct se_cmd->scsi_sense_reason already set
1963 */
1964 break;
1965 default:
6708bb27 1966 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
a1d8b49a 1967 cmd->t_task_cdb[0],
c66ac9db
NB		 1968 cmd->transport_error_status);
1969 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1970 break;
1971 }
16ab8e60
NB		 1972 /*
1973 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1974 * make the call to transport_send_check_condition_and_sense()
1975 * directly. Otherwise expect the fabric to make the call to
1976 * transport_send_check_condition_and_sense() after handling
1977 * possible unsoliticied write data payloads.
1978 */
1979 if (!sc && !cmd->se_tfo->new_cmd_map)
c66ac9db 1980 transport_new_cmd_failure(cmd);
07bde79a
NB		 1981 else {
1982 ret = transport_send_check_condition_and_sense(cmd,
1983 cmd->scsi_sense_reason, 0);
1984 if (ret == -EAGAIN)
1985 goto queue_full;
1986 }
1987
c66ac9db
NB		 1988check_stop:
1989 transport_lun_remove_cmd(cmd);
6708bb27 1990 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1991 ;
07bde79a
NB		 1992 return;
1993
1994queue_full:
e057f533
CH		 1995 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1996 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1997}
1998
1999static void transport_direct_request_timeout(struct se_cmd *cmd)
2000{
2001 unsigned long flags;
2002
a1d8b49a 2003 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 2004 if (!atomic_read(&cmd->t_transport_timeout)) {
a1d8b49a 2005 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2006 return;
2007 }
a1d8b49a
AG		 2008 if (atomic_read(&cmd->t_task_cdbs_timeout_left)) {
2009 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2010 return;
2011 }
2012
a1d8b49a
AG		 2013 atomic_sub(atomic_read(&cmd->t_transport_timeout),
2014 &cmd->t_se_count);
2015 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2016}
2017
c66ac9db
NB		 2018static inline u32 transport_lba_21(unsigned char *cdb)
2019{
2020 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2021}
2022
2023static inline u32 transport_lba_32(unsigned char *cdb)
2024{
2025 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2026}
2027
2028static inline unsigned long long transport_lba_64(unsigned char *cdb)
2029{
2030 unsigned int __v1, __v2;
2031
2032 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2033 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2034
2035 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2036}
2037
2038/*
2039 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2040 */
2041static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2042{
2043 unsigned int __v1, __v2;
2044
2045 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2046 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2047
2048 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2049}
2050
2051static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2052{
2053 unsigned long flags;
2054
a1d8b49a 2055 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 2056 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 2057 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2058}
2059
2060/*
2061 * Called from interrupt context.
2062 */
2063static void transport_task_timeout_handler(unsigned long data)
2064{
2065 struct se_task *task = (struct se_task *)data;
e3d6f909 2066 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db
NB		 2067 unsigned long flags;
2068
6708bb27 2069 pr_debug("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
c66ac9db 2070
a1d8b49a 2071 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 2072
2073 /*
2074 * Determine if transport_complete_task() has already been called.
2075 */
6c76bf95
CH		 2076 if (!(task->task_flags & TF_ACTIVE)) {
2077 pr_debug("transport task: %p cmd: %p timeout !TF_ACTIVE\n",
2078 task, cmd);
a1d8b49a 2079 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2080 return;
2081 }
2082
a1d8b49a
AG		 2083 atomic_inc(&cmd->t_se_count);
2084 atomic_inc(&cmd->t_transport_timeout);
2085 cmd->t_tasks_failed = 1;
c66ac9db 2086
6c76bf95 2087 task->task_flags |= TF_TIMEOUT;
c66ac9db
NB		 2088 task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
2089 task->task_scsi_status = 1;
2090
6c76bf95
CH		 2091 if (task->task_flags & TF_REQUEST_STOP) {
2092 pr_debug("transport task: %p cmd: %p timeout TF_REQUEST_STOP"
c66ac9db 2093 " == 1\n", task, cmd);
a1d8b49a 2094 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2095 complete(&task->task_stop_comp);
2096 return;
2097 }
2098
6708bb27
AG		 2099 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
2100 pr_debug("transport task: %p cmd: %p timeout non zero"
c66ac9db 2101 " t_task_cdbs_left\n", task, cmd);
a1d8b49a 2102 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2103 return;
2104 }
6708bb27 2105 pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
c66ac9db
NB		 2106 task, cmd);
2107
35e0e757
CH		 2108 INIT_WORK(&cmd->work, target_complete_failure_work);
2109 cmd->t_state = TRANSPORT_COMPLETE;
2110 atomic_set(&cmd->t_transport_active, 1);
a1d8b49a 2111 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2112
35e0e757 2113 queue_work(target_completion_wq, &cmd->work);
c66ac9db
NB		 2114}
2115
c66ac9db
NB		 2116static void transport_start_task_timer(struct se_task *task)
2117{
42bf829e 2118 struct se_device *dev = task->task_se_cmd->se_dev;
c66ac9db
NB		 2119 int timeout;
2120
c66ac9db
NB		 2121 /*
2122 * If the task_timeout is disabled, exit now.
2123 */
e3d6f909 2124 timeout = dev->se_sub_dev->se_dev_attrib.task_timeout;
6708bb27 2125 if (!timeout)
c66ac9db
NB		 2126 return;
2127
c66ac9db
NB		 2128 task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
2129 task->task_timer.data = (unsigned long) task;
2130 task->task_timer.function = transport_task_timeout_handler;
c66ac9db 2131 add_timer(&task->task_timer);
c66ac9db
NB		 2132}
2133
2134static inline int transport_tcq_window_closed(struct se_device *dev)
2135{
2136 if (dev->dev_tcq_window_closed++ <
2137 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
2138 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
2139 } else
2140 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
2141
e3d6f909 2142 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 2143 return 0;
2144}
2145
2146/*
2147 * Called from Fabric Module context from transport_execute_tasks()
2148 *
2149 * The return of this function determins if the tasks from struct se_cmd
2150 * get added to the execution queue in transport_execute_tasks(),
2151 * or are added to the delayed or ordered lists here.
2152 */
2153static inline int transport_execute_task_attr(struct se_cmd *cmd)
2154{
5951146d 2155 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 2156 return 1;
2157 /*
25985edc 2158 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 2159 * to allow the passed struct se_cmd list of tasks to the front of the list.
2160 */
e66ecd50 2161 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
5951146d 2162 atomic_inc(&cmd->se_dev->dev_hoq_count);
c66ac9db 2163 smp_mb__after_atomic_inc();
6708bb27 2164 pr_debug("Added HEAD_OF_QUEUE for CDB:"
c66ac9db 2165 " 0x%02x, se_ordered_id: %u\n",
6708bb27 2166 cmd->t_task_cdb[0],
c66ac9db
NB		 2167 cmd->se_ordered_id);
2168 return 1;
e66ecd50 2169 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d
AG		 2170 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2171 list_add_tail(&cmd->se_ordered_node,
2172 &cmd->se_dev->ordered_cmd_list);
2173 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
c66ac9db 2174
5951146d 2175 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 2176 smp_mb__after_atomic_inc();
2177
6708bb27 2178 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 2179 " list, se_ordered_id: %u\n",
a1d8b49a 2180 cmd->t_task_cdb[0],
c66ac9db
NB		 2181 cmd->se_ordered_id);
2182 /*
2183 * Add ORDERED command to tail of execution queue if
2184 * no other older commands exist that need to be
2185 * completed first.
2186 */
6708bb27 2187 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 2188 return 1;
2189 } else {
2190 /*
2191 * For SIMPLE and UNTAGGED Task Attribute commands
2192 */
5951146d 2193 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 2194 smp_mb__after_atomic_inc();
2195 }
2196 /*
2197 * Otherwise if one or more outstanding ORDERED task attribute exist,
2198 * add the dormant task(s) built for the passed struct se_cmd to the
2199 * execution queue and become in Active state for this struct se_device.
2200 */
5951146d 2201 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 2202 /*
2203 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 2204 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 2205 */
5951146d 2206 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2207 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 2208 list_add_tail(&cmd->se_delayed_node,
2209 &cmd->se_dev->delayed_cmd_list);
2210 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2211
6708bb27 2212 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 2213 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 2214 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 2215 cmd->se_ordered_id);
2216 /*
2217 * Return zero to let transport_execute_tasks() know
2218 * not to add the delayed tasks to the execution list.
2219 */
2220 return 0;
2221 }
2222 /*
2223 * Otherwise, no ORDERED task attributes exist..
2224 */
2225 return 1;
2226}
2227
2228/*
2229 * Called from fabric module context in transport_generic_new_cmd() and
2230 * transport_generic_process_write()
2231 */
2232static int transport_execute_tasks(struct se_cmd *cmd)
2233{
2234 int add_tasks;
2235
db1620a2
CH		 2236 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2237 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
4499dda8 2238 transport_generic_request_failure(cmd, 0, 1);
db1620a2 2239 return 0;
c66ac9db 2240 }
db1620a2 2241
c66ac9db
NB		 2242 /*
2243 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2244 * has occurred that prevents execution.
c66ac9db 2245 */
6708bb27 2246 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 2247 /*
2248 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2249 * attribute for the tasks of the received struct se_cmd CDB
2250 */
2251 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2252 if (!add_tasks)
c66ac9db
NB		 2253 goto execute_tasks;
2254 /*
2255 * This calls transport_add_tasks_from_cmd() to handle
2256 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2257 * (if enabled) in __transport_add_task_to_execute_queue() and
2258 * transport_add_task_check_sam_attr().
2259 */
2260 transport_add_tasks_from_cmd(cmd);
2261 }
2262 /*
2263 * Kick the execution queue for the cmd associated struct se_device
2264 * storage object.
2265 */
2266execute_tasks:
5951146d 2267 __transport_execute_tasks(cmd->se_dev);
c66ac9db
NB		 2268 return 0;
2269}
2270
2271/*
2272 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2273 * from struct se_device->execute_task_list and
2274 *
2275 * Called from transport_processing_thread()
2276 */
2277static int __transport_execute_tasks(struct se_device *dev)
2278{
2279 int error;
2280 struct se_cmd *cmd = NULL;
e3d6f909 2281 struct se_task *task = NULL;
c66ac9db
NB		 2282 unsigned long flags;
2283
2284 /*
2285 * Check if there is enough room in the device and HBA queue to send
a1d8b49a 2286 * struct se_tasks to the selected transport.
c66ac9db
NB		 2287 */
2288check_depth:
e3d6f909 2289 if (!atomic_read(&dev->depth_left))
c66ac9db 2290 return transport_tcq_window_closed(dev);
c66ac9db 2291
e3d6f909 2292 dev->dev_tcq_window_closed = 0;
c66ac9db 2293
e3d6f909
AG		 2294 spin_lock_irq(&dev->execute_task_lock);
2295 if (list_empty(&dev->execute_task_list)) {
2296 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2297 return 0;
2298 }
e3d6f909
AG		 2299 task = list_first_entry(&dev->execute_task_list,
2300 struct se_task, t_execute_list);
04629b7b 2301 __transport_remove_task_from_execute_queue(task, dev);
e3d6f909 2302 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2303
2304 atomic_dec(&dev->depth_left);
c66ac9db 2305
e3d6f909 2306 cmd = task->task_se_cmd;
c66ac9db 2307
a1d8b49a 2308 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 2309 task->task_flags |= (TF_ACTIVE | TF_SENT);
a1d8b49a 2310 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2311
a1d8b49a
AG		 2312 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2313 cmd->t_task_list_num)
c66ac9db
NB		 2314 atomic_set(&cmd->transport_sent, 1);
2315
2316 transport_start_task_timer(task);
a1d8b49a 2317 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2318 /*
2319 * The struct se_cmd->transport_emulate_cdb() function pointer is used
e3d6f909 2320 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
c66ac9db
NB		 2321 * struct se_subsystem_api->do_task() caller below.
2322 */
2323 if (cmd->transport_emulate_cdb) {
2324 error = cmd->transport_emulate_cdb(cmd);
2325 if (error != 0) {
2326 cmd->transport_error_status = error;
6c76bf95
CH		 2327 spin_lock_irqsave(&cmd->t_state_lock, flags);
2328 task->task_flags &= ~TF_ACTIVE;
2329 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cc5d0f0f 2330 del_timer_sync(&task->task_timer);
c66ac9db
NB		 2331 atomic_set(&cmd->transport_sent, 0);
2332 transport_stop_tasks_for_cmd(cmd);
4499dda8
CH		 2333 atomic_inc(&dev->depth_left);
2334 transport_generic_request_failure(cmd, 0, 1);
c66ac9db
NB		 2335 goto check_depth;
2336 }
2337 /*
2338 * Handle the successful completion for transport_emulate_cdb()
2339 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2340 * Otherwise the caller is expected to complete the task with
2341 * proper status.
2342 */
2343 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2344 cmd->scsi_status = SAM_STAT_GOOD;
2345 task->task_scsi_status = GOOD;
2346 transport_complete_task(task, 1);
2347 }
2348 } else {
2349 /*
2350 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2351 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2352 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2353 * LUN emulation code.
2354 *
2355 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2356 * call ->do_task() directly and let the underlying TCM subsystem plugin
2357 * code handle the CDB emulation.
2358 */
e3d6f909
AG		 2359 if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2360 (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
c66ac9db
NB		 2361 error = transport_emulate_control_cdb(task);
2362 else
e3d6f909 2363 error = dev->transport->do_task(task);
c66ac9db
NB		 2364
2365 if (error != 0) {
2366 cmd->transport_error_status = error;
6c76bf95
CH		 2367 spin_lock_irqsave(&cmd->t_state_lock, flags);
2368 task->task_flags &= ~TF_ACTIVE;
2369 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cc5d0f0f 2370 del_timer_sync(&task->task_timer);
c66ac9db
NB		 2371 atomic_set(&cmd->transport_sent, 0);
2372 transport_stop_tasks_for_cmd(cmd);
4499dda8
CH		 2373 atomic_inc(&dev->depth_left);
2374 transport_generic_request_failure(cmd, 0, 1);
c66ac9db
NB		 2375 }
2376 }
2377
2378 goto check_depth;
2379
2380 return 0;
2381}
2382
2383void transport_new_cmd_failure(struct se_cmd *se_cmd)
2384{
2385 unsigned long flags;
2386 /*
2387 * Any unsolicited data will get dumped for failed command inside of
2388 * the fabric plugin
2389 */
a1d8b49a 2390 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2391 se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2392 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
a1d8b49a 2393 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2394}
2395
c66ac9db
NB		 2396static inline u32 transport_get_sectors_6(
2397 unsigned char *cdb,
2398 struct se_cmd *cmd,
2399 int *ret)
2400{
5951146d 2401 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2402
2403 /*
2404 * Assume TYPE_DISK for non struct se_device objects.
2405 * Use 8-bit sector value.
2406 */
2407 if (!dev)
2408 goto type_disk;
2409
2410 /*
2411 * Use 24-bit allocation length for TYPE_TAPE.
2412 */
e3d6f909 2413 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2414 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2415
2416 /*
2417 * Everything else assume TYPE_DISK Sector CDB location.
2418 * Use 8-bit sector value.
2419 */
2420type_disk:
2421 return (u32)cdb[4];
2422}
2423
2424static inline u32 transport_get_sectors_10(
2425 unsigned char *cdb,
2426 struct se_cmd *cmd,
2427 int *ret)
2428{
5951146d 2429 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2430
2431 /*
2432 * Assume TYPE_DISK for non struct se_device objects.
2433 * Use 16-bit sector value.
2434 */
2435 if (!dev)
2436 goto type_disk;
2437
2438 /*
2439 * XXX_10 is not defined in SSC, throw an exception
2440 */
e3d6f909
AG		 2441 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2442 *ret = -EINVAL;
c66ac9db
NB		 2443 return 0;
2444 }
2445
2446 /*
2447 * Everything else assume TYPE_DISK Sector CDB location.
2448 * Use 16-bit sector value.
2449 */
2450type_disk:
2451 return (u32)(cdb[7] << 8) + cdb[8];
2452}
2453
2454static inline u32 transport_get_sectors_12(
2455 unsigned char *cdb,
2456 struct se_cmd *cmd,
2457 int *ret)
2458{
5951146d 2459 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2460
2461 /*
2462 * Assume TYPE_DISK for non struct se_device objects.
2463 * Use 32-bit sector value.
2464 */
2465 if (!dev)
2466 goto type_disk;
2467
2468 /*
2469 * XXX_12 is not defined in SSC, throw an exception
2470 */
e3d6f909
AG		 2471 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2472 *ret = -EINVAL;
c66ac9db
NB		 2473 return 0;
2474 }
2475
2476 /*
2477 * Everything else assume TYPE_DISK Sector CDB location.
2478 * Use 32-bit sector value.
2479 */
2480type_disk:
2481 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2482}
2483
2484static inline u32 transport_get_sectors_16(
2485 unsigned char *cdb,
2486 struct se_cmd *cmd,
2487 int *ret)
2488{
5951146d 2489 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2490
2491 /*
2492 * Assume TYPE_DISK for non struct se_device objects.
2493 * Use 32-bit sector value.
2494 */
2495 if (!dev)
2496 goto type_disk;
2497
2498 /*
2499 * Use 24-bit allocation length for TYPE_TAPE.
2500 */
e3d6f909 2501 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2502 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2503
2504type_disk:
2505 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2506 (cdb[12] << 8) + cdb[13];
2507}
2508
2509/*
2510 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2511 */
2512static inline u32 transport_get_sectors_32(
2513 unsigned char *cdb,
2514 struct se_cmd *cmd,
2515 int *ret)
2516{
2517 /*
2518 * Assume TYPE_DISK for non struct se_device objects.
2519 * Use 32-bit sector value.
2520 */
2521 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2522 (cdb[30] << 8) + cdb[31];
2523
2524}
2525
2526static inline u32 transport_get_size(
2527 u32 sectors,
2528 unsigned char *cdb,
2529 struct se_cmd *cmd)
2530{
5951146d 2531 struct se_device *dev = cmd->se_dev;
c66ac9db 2532
e3d6f909 2533 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2534 if (cdb[1] & 1) { /* sectors */
e3d6f909 2535 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2536 } else /* bytes */
2537 return sectors;
2538 }
2539#if 0
6708bb27 2540 pr_debug("Returning block_size: %u, sectors: %u == %u for"
e3d6f909
AG		 2541 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2542 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2543 dev->transport->name);
c66ac9db 2544#endif
e3d6f909 2545 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2546}
2547
c66ac9db
NB		 2548static void transport_xor_callback(struct se_cmd *cmd)
2549{
2550 unsigned char *buf, *addr;
ec98f782 2551 struct scatterlist *sg;
c66ac9db
NB		 2552 unsigned int offset;
2553 int i;
ec98f782 2554 int count;
c66ac9db
NB		 2555 /*
2556 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2557 *
2558 * 1) read the specified logical block(s);
2559 * 2) transfer logical blocks from the data-out buffer;
2560 * 3) XOR the logical blocks transferred from the data-out buffer with
2561 * the logical blocks read, storing the resulting XOR data in a buffer;
2562 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2563 * blocks transferred from the data-out buffer; and
2564 * 5) transfer the resulting XOR data to the data-in buffer.
2565 */
2566 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2567 if (!buf) {
2568 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2569 return;
2570 }
2571 /*
ec98f782 2572 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2573 * into the locally allocated *buf
2574 */
ec98f782
AG		 2575 sg_copy_to_buffer(cmd->t_data_sg,
2576 cmd->t_data_nents,
2577 buf,
2578 cmd->data_length);
2579
c66ac9db
NB		 2580 /*
2581 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2582 * cmd->t_mem_bidi_list
c66ac9db
NB		 2583 */
2584
2585 offset = 0;
ec98f782
AG		 2586 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2587 addr = kmap_atomic(sg_page(sg), KM_USER0);
2588 if (!addr)
c66ac9db
NB		 2589 goto out;
2590
ec98f782
AG		 2591 for (i = 0; i < sg->length; i++)
2592 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2593
ec98f782 2594 offset += sg->length;
c66ac9db
NB		 2595 kunmap_atomic(addr, KM_USER0);
2596 }
ec98f782 2597
c66ac9db
NB		 2598out:
2599 kfree(buf);
2600}
2601
2602/*
2603 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2604 */
2605static int transport_get_sense_data(struct se_cmd *cmd)
2606{
2607 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
42bf829e 2608 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2609 struct se_task *task = NULL, *task_tmp;
2610 unsigned long flags;
2611 u32 offset = 0;
2612
e3d6f909
AG		 2613 WARN_ON(!cmd->se_lun);
2614
42bf829e
CH		 2615 if (!dev)
2616 return 0;
2617
a1d8b49a 2618 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2619 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2620 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2621 return 0;
2622 }
2623
2624 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2625 &cmd->t_task_list, t_list) {
c66ac9db
NB		 2626 if (!task->task_sense)
2627 continue;
2628
e3d6f909 2629 if (!dev->transport->get_sense_buffer) {
6708bb27 2630 pr_err("dev->transport->get_sense_buffer"
c66ac9db
NB		 2631 " is NULL\n");
2632 continue;
2633 }
2634
e3d6f909 2635 sense_buffer = dev->transport->get_sense_buffer(task);
6708bb27 2636 if (!sense_buffer) {
04629b7b 2637 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
c66ac9db 2638 " sense buffer for task with sense\n",
04629b7b 2639 cmd->se_tfo->get_task_tag(cmd), task);
c66ac9db
NB		 2640 continue;
2641 }
a1d8b49a 2642 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2643
e3d6f909 2644 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2645 TRANSPORT_SENSE_BUFFER);
2646
5951146d 2647 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2648 TRANSPORT_SENSE_BUFFER);
2649 cmd->scsi_status = task->task_scsi_status;
2650 /* Automatically padded */
2651 cmd->scsi_sense_length =
2652 (TRANSPORT_SENSE_BUFFER + offset);
2653
6708bb27 2654 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
c66ac9db 2655 " and sense\n",
e3d6f909 2656 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2657 cmd->scsi_status);
2658 return 0;
2659 }
a1d8b49a 2660 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2661
2662 return -1;
2663}
2664
c66ac9db
NB		 2665static int
2666transport_handle_reservation_conflict(struct se_cmd *cmd)
2667{
c66ac9db
NB		 2668 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2669 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2670 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2671 /*
2672 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2673 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2674 * CONFLICT STATUS.
2675 *
2676 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2677 */
e3d6f909
AG		 2678 if (cmd->se_sess &&
2679 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2680 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 2681 cmd->orig_fe_lun, 0x2C,
2682 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
5951146d 2683 return -EINVAL;
c66ac9db
NB		 2684}
2685
ec98f782
AG		 2686static inline long long transport_dev_end_lba(struct se_device *dev)
2687{
2688 return dev->transport->get_blocks(dev) + 1;
2689}
2690
2691static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2692{
2693 struct se_device *dev = cmd->se_dev;
2694 u32 sectors;
2695
2696 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2697 return 0;
2698
2699 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2700
6708bb27
AG		 2701 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2702 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2703 " transport_dev_end_lba(): %llu\n",
2704 cmd->t_task_lba, sectors,
2705 transport_dev_end_lba(dev));
7abbe7f3 2706 return -EINVAL;
ec98f782
AG		 2707 }
2708
7abbe7f3 2709 return 0;
ec98f782
AG		 2710}
2711
706d5860
NB		 2712static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2713{
2714 /*
2715 * Determine if the received WRITE_SAME is used to for direct
2716 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2717 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2718 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2719 */
2720 int passthrough = (dev->transport->transport_type ==
2721 TRANSPORT_PLUGIN_PHBA_PDEV);
2722
2723 if (!passthrough) {
2724 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2725 pr_err("WRITE_SAME PBDATA and LBDATA"
2726 " bits not supported for Block Discard"
2727 " Emulation\n");
2728 return -ENOSYS;
2729 }
2730 /*
2731 * Currently for the emulated case we only accept
2732 * tpws with the UNMAP=1 bit set.
2733 */
2734 if (!(flags[0] & 0x08)) {
2735 pr_err("WRITE_SAME w/o UNMAP bit not"
2736 " supported for Block Discard Emulation\n");
2737 return -ENOSYS;
2738 }
2739 }
2740
2741 return 0;
2742}
2743
c66ac9db
NB		 2744/* transport_generic_cmd_sequencer():
2745 *
2746 * Generic Command Sequencer that should work for most DAS transport
2747 * drivers.
2748 *
2749 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2750 * RX Thread.
2751 *
2752 * FIXME: Need to support other SCSI OPCODES where as well.
2753 */
2754static int transport_generic_cmd_sequencer(
2755 struct se_cmd *cmd,
2756 unsigned char *cdb)
2757{
5951146d 2758 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2759 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2760 int ret = 0, sector_ret = 0, passthrough;
2761 u32 sectors = 0, size = 0, pr_reg_type = 0;
2762 u16 service_action;
2763 u8 alua_ascq = 0;
2764 /*
2765 * Check for an existing UNIT ATTENTION condition
2766 */
2767 if (core_scsi3_ua_check(cmd, cdb) < 0) {
c66ac9db
NB		 2768 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2769 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2770 return -EINVAL;
c66ac9db
NB		 2771 }
2772 /*
2773 * Check status of Asymmetric Logical Unit Assignment port
2774 */
e3d6f909 2775 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db 2776 if (ret != 0) {
c66ac9db 2777 /*
25985edc 2778 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2779 * The ALUA additional sense code qualifier (ASCQ) is determined
2780 * by the ALUA primary or secondary access state..
2781 */
2782 if (ret > 0) {
2783#if 0
6708bb27 2784 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2785 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2786 cmd->se_tfo->get_fabric_name(), alua_ascq);
c66ac9db
NB		 2787#endif
2788 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2789 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2790 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2791 return -EINVAL;
c66ac9db
NB		 2792 }
2793 goto out_invalid_cdb_field;
2794 }
2795 /*
2796 * Check status for SPC-3 Persistent Reservations
2797 */
e3d6f909
AG		 2798 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2799 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
c66ac9db
NB		 2800 cmd, cdb, pr_reg_type) != 0)
2801 return transport_handle_reservation_conflict(cmd);
2802 /*
2803 * This means the CDB is allowed for the SCSI Initiator port
2804 * when said port is *NOT* holding the legacy SPC-2 or
2805 * SPC-3 Persistent Reservation.
2806 */
2807 }
2808
2809 switch (cdb[0]) {
2810 case READ_6:
2811 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2812 if (sector_ret)
2813 goto out_unsupported_cdb;
2814 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2815 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2816 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2817 break;
2818 case READ_10:
2819 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2820 if (sector_ret)
2821 goto out_unsupported_cdb;
2822 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2823 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2824 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2825 break;
2826 case READ_12:
2827 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2828 if (sector_ret)
2829 goto out_unsupported_cdb;
2830 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2831 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2832 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2833 break;
2834 case READ_16:
2835 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2836 if (sector_ret)
2837 goto out_unsupported_cdb;
2838 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2839 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2840 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2841 break;
2842 case WRITE_6:
2843 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2844 if (sector_ret)
2845 goto out_unsupported_cdb;
2846 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2847 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2848 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2849 break;
2850 case WRITE_10:
2851 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2852 if (sector_ret)
2853 goto out_unsupported_cdb;
2854 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a
AG		 2855 cmd->t_task_lba = transport_lba_32(cdb);
2856 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2857 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2858 break;
2859 case WRITE_12:
2860 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2861 if (sector_ret)
2862 goto out_unsupported_cdb;
2863 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a
AG		 2864 cmd->t_task_lba = transport_lba_32(cdb);
2865 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2866 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2867 break;
2868 case WRITE_16:
2869 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2870 if (sector_ret)
2871 goto out_unsupported_cdb;
2872 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a
AG		 2873 cmd->t_task_lba = transport_lba_64(cdb);
2874 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2875 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2876 break;
2877 case XDWRITEREAD_10:
2878 if ((cmd->data_direction != DMA_TO_DEVICE) ||
a1d8b49a 2879 !(cmd->t_tasks_bidi))
c66ac9db
NB		 2880 goto out_invalid_cdb_field;
2881 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2882 if (sector_ret)
2883 goto out_unsupported_cdb;
2884 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2885 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 2886 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
e3d6f909 2887 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 2888 TRANSPORT_PLUGIN_PHBA_PDEV);
2889 /*
2890 * Skip the remaining assignments for TCM/PSCSI passthrough
2891 */
2892 if (passthrough)
2893 break;
2894 /*
35e0e757 2895 * Setup BIDI XOR callback to be run after I/O completion.
c66ac9db
NB		 2896 */
2897 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 2898 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2899 break;
2900 case VARIABLE_LENGTH_CMD:
2901 service_action = get_unaligned_be16(&cdb[8]);
2902 /*
2903 * Determine if this is TCM/PSCSI device and we should disable
2904 * internal emulation for this CDB.
2905 */
e3d6f909 2906 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 2907 TRANSPORT_PLUGIN_PHBA_PDEV);
2908
2909 switch (service_action) {
2910 case XDWRITEREAD_32:
2911 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2912 if (sector_ret)
2913 goto out_unsupported_cdb;
2914 size = transport_get_size(sectors, cdb, cmd);
2915 /*
2916 * Use WRITE_32 and READ_32 opcodes for the emulated
2917 * XDWRITE_READ_32 logic.
2918 */
a1d8b49a 2919 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 2920 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2921
2922 /*
2923 * Skip the remaining assignments for TCM/PSCSI passthrough
2924 */
2925 if (passthrough)
2926 break;
2927
2928 /*
35e0e757
CH		 2929 * Setup BIDI XOR callback to be run during after I/O
2930 * completion.
c66ac9db
NB		 2931 */
2932 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 2933 cmd->t_tasks_fua = (cdb[10] & 0x8);
c66ac9db
NB		 2934 break;
2935 case WRITE_SAME_32:
2936 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2937 if (sector_ret)
2938 goto out_unsupported_cdb;
dd3a5ad8 2939
6708bb27 2940 if (sectors)
12850626 2941 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2942 else {
2943 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2944 " supported\n");
2945 goto out_invalid_cdb_field;
2946 }
dd3a5ad8 2947
a1d8b49a 2948 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 2949 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2950
706d5860 2951 if (target_check_write_same_discard(&cdb[10], dev) < 0)
c66ac9db 2952 goto out_invalid_cdb_field;
706d5860 2953
c66ac9db
NB		 2954 break;
2955 default:
6708bb27 2956 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 2957 " 0x%04x not supported\n", service_action);
2958 goto out_unsupported_cdb;
2959 }
2960 break;
e434f1f1 2961 case MAINTENANCE_IN:
e3d6f909 2962 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2963 /* MAINTENANCE_IN from SCC-2 */
2964 /*
2965 * Check for emulated MI_REPORT_TARGET_PGS.
2966 */
2967 if (cdb[1] == MI_REPORT_TARGET_PGS) {
2968 cmd->transport_emulate_cdb =
e3d6f909 2969 (su_dev->t10_alua.alua_type ==
c66ac9db 2970 SPC3_ALUA_EMULATED) ?
e3d6f909 2971 core_emulate_report_target_port_groups :
c66ac9db
NB		 2972 NULL;
2973 }
2974 size = (cdb[6] << 24) | (cdb[7] << 16) |
2975 (cdb[8] << 8) | cdb[9];
2976 } else {
2977 /* GPCMD_SEND_KEY from multi media commands */
2978 size = (cdb[8] << 8) + cdb[9];
2979 }
05d1c7c0 2980 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2981 break;
2982 case MODE_SELECT:
2983 size = cdb[4];
2984 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2985 break;
2986 case MODE_SELECT_10:
2987 size = (cdb[7] << 8) + cdb[8];
2988 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2989 break;
2990 case MODE_SENSE:
2991 size = cdb[4];
05d1c7c0 2992 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2993 break;
2994 case MODE_SENSE_10:
2995 case GPCMD_READ_BUFFER_CAPACITY:
2996 case GPCMD_SEND_OPC:
2997 case LOG_SELECT:
2998 case LOG_SENSE:
2999 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 3000 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3001 break;
3002 case READ_BLOCK_LIMITS:
3003 size = READ_BLOCK_LEN;
05d1c7c0 3004 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3005 break;
3006 case GPCMD_GET_CONFIGURATION:
3007 case GPCMD_READ_FORMAT_CAPACITIES:
3008 case GPCMD_READ_DISC_INFO:
3009 case GPCMD_READ_TRACK_RZONE_INFO:
3010 size = (cdb[7] << 8) + cdb[8];
3011 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3012 break;
3013 case PERSISTENT_RESERVE_IN:
3014 case PERSISTENT_RESERVE_OUT:
3015 cmd->transport_emulate_cdb =
e3d6f909 3016 (su_dev->t10_pr.res_type ==
c66ac9db 3017 SPC3_PERSISTENT_RESERVATIONS) ?
e3d6f909 3018 core_scsi3_emulate_pr : NULL;
c66ac9db 3019 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 3020 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3021 break;
3022 case GPCMD_MECHANISM_STATUS:
3023 case GPCMD_READ_DVD_STRUCTURE:
3024 size = (cdb[8] << 8) + cdb[9];
3025 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3026 break;
3027 case READ_POSITION:
3028 size = READ_POSITION_LEN;
05d1c7c0 3029 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 3030 break;
e434f1f1 3031 case MAINTENANCE_OUT:
e3d6f909 3032 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 3033 /* MAINTENANCE_OUT from SCC-2
3034 *
3035 * Check for emulated MO_SET_TARGET_PGS.
3036 */
3037 if (cdb[1] == MO_SET_TARGET_PGS) {
3038 cmd->transport_emulate_cdb =
e3d6f909 3039 (su_dev->t10_alua.alua_type ==
c66ac9db 3040 SPC3_ALUA_EMULATED) ?
e3d6f909 3041 core_emulate_set_target_port_groups :
c66ac9db
NB		 3042 NULL;
3043 }
3044
3045 size = (cdb[6] << 24) | (cdb[7] << 16) |
3046 (cdb[8] << 8) | cdb[9];
3047 } else {
3048 /* GPCMD_REPORT_KEY from multi media commands */
3049 size = (cdb[8] << 8) + cdb[9];
3050 }
05d1c7c0 3051 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3052 break;
3053 case INQUIRY:
3054 size = (cdb[3] << 8) + cdb[4];
3055 /*
3056 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3057 * See spc4r17 section 5.3
3058 */
5951146d 3059 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3060 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3061 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3062 break;
3063 case READ_BUFFER:
3064 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 3065 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3066 break;
3067 case READ_CAPACITY:
3068 size = READ_CAP_LEN;
05d1c7c0 3069 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3070 break;
3071 case READ_MEDIA_SERIAL_NUMBER:
3072 case SECURITY_PROTOCOL_IN:
3073 case SECURITY_PROTOCOL_OUT:
3074 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 3075 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3076 break;
3077 case SERVICE_ACTION_IN:
3078 case ACCESS_CONTROL_IN:
3079 case ACCESS_CONTROL_OUT:
3080 case EXTENDED_COPY:
3081 case READ_ATTRIBUTE:
3082 case RECEIVE_COPY_RESULTS:
3083 case WRITE_ATTRIBUTE:
3084 size = (cdb[10] << 24) | (cdb[11] << 16) |
3085 (cdb[12] << 8) | cdb[13];
05d1c7c0 3086 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3087 break;
3088 case RECEIVE_DIAGNOSTIC:
3089 case SEND_DIAGNOSTIC:
3090 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 3091 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3092 break;
3093/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3094#if 0
3095 case GPCMD_READ_CD:
3096 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3097 size = (2336 * sectors);
05d1c7c0 3098 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3099 break;
3100#endif
3101 case READ_TOC:
3102 size = cdb[8];
05d1c7c0 3103 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3104 break;
3105 case REQUEST_SENSE:
3106 size = cdb[4];
05d1c7c0 3107 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3108 break;
3109 case READ_ELEMENT_STATUS:
3110 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 3111 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3112 break;
3113 case WRITE_BUFFER:
3114 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 3115 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3116 break;
3117 case RESERVE:
3118 case RESERVE_10:
3119 /*
3120 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3121 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3122 */
3123 if (cdb[0] == RESERVE_10)
3124 size = (cdb[7] << 8) | cdb[8];
3125 else
3126 size = cmd->data_length;
3127
3128 /*
3129 * Setup the legacy emulated handler for SPC-2 and
3130 * >= SPC-3 compatible reservation handling (CRH=1)
3131 * Otherwise, we assume the underlying SCSI logic is
3132 * is running in SPC_PASSTHROUGH, and wants reservations
3133 * emulation disabled.
3134 */
3135 cmd->transport_emulate_cdb =
e3d6f909 3136 (su_dev->t10_pr.res_type !=
c66ac9db 3137 SPC_PASSTHROUGH) ?
e3d6f909 3138 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 3139 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3140 break;
3141 case RELEASE:
3142 case RELEASE_10:
3143 /*
3144 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3145 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3146 */
3147 if (cdb[0] == RELEASE_10)
3148 size = (cdb[7] << 8) | cdb[8];
3149 else
3150 size = cmd->data_length;
3151
3152 cmd->transport_emulate_cdb =
e3d6f909 3153 (su_dev->t10_pr.res_type !=
c66ac9db 3154 SPC_PASSTHROUGH) ?
e3d6f909 3155 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 3156 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3157 break;
3158 case SYNCHRONIZE_CACHE:
3159 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3160 /*
3161 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3162 */
3163 if (cdb[0] == SYNCHRONIZE_CACHE) {
3164 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 3165 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 3166 } else {
3167 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 3168 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 3169 }
3170 if (sector_ret)
3171 goto out_unsupported_cdb;
3172
3173 size = transport_get_size(sectors, cdb, cmd);
3174 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3175
3176 /*
3177 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3178 */
e3d6f909 3179 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 3180 break;
3181 /*
3182 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3183 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3184 */
3185 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3186 /*
3187 * Check to ensure that LBA + Range does not exceed past end of
7abbe7f3 3188 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
c66ac9db 3189 */
7abbe7f3
NB		 3190 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
3191 if (transport_cmd_get_valid_sectors(cmd) < 0)
3192 goto out_invalid_cdb_field;
3193 }
c66ac9db
NB		 3194 break;
3195 case UNMAP:
3196 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 3197 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3198 break;
3199 case WRITE_SAME_16:
3200 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3201 if (sector_ret)
3202 goto out_unsupported_cdb;
dd3a5ad8 3203
6708bb27 3204 if (sectors)
12850626 3205 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 3206 else {
3207 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3208 goto out_invalid_cdb_field;
3209 }
dd3a5ad8 3210
5db0753b 3211 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
706d5860
NB		 3212 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3213
3214 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3215 goto out_invalid_cdb_field;
3216 break;
3217 case WRITE_SAME:
3218 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3219 if (sector_ret)
3220 goto out_unsupported_cdb;
3221
3222 if (sectors)
12850626 3223 size = transport_get_size(1, cdb, cmd);
706d5860
NB		 3224 else {
3225 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3226 goto out_invalid_cdb_field;
c66ac9db 3227 }
706d5860
NB		 3228
3229 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
c66ac9db 3230 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
706d5860
NB		 3231 /*
3232 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3233 * of byte 1 bit 3 UNMAP instead of original reserved field
3234 */
3235 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3236 goto out_invalid_cdb_field;
c66ac9db
NB		 3237 break;
3238 case ALLOW_MEDIUM_REMOVAL:
3239 case GPCMD_CLOSE_TRACK:
3240 case ERASE:
3241 case INITIALIZE_ELEMENT_STATUS:
3242 case GPCMD_LOAD_UNLOAD:
3243 case REZERO_UNIT:
3244 case SEEK_10:
3245 case GPCMD_SET_SPEED:
3246 case SPACE:
3247 case START_STOP:
3248 case TEST_UNIT_READY:
3249 case VERIFY:
3250 case WRITE_FILEMARKS:
3251 case MOVE_MEDIUM:
3252 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3253 break;
3254 case REPORT_LUNS:
3255 cmd->transport_emulate_cdb =
e3d6f909 3256 transport_core_report_lun_response;
c66ac9db
NB		 3257 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3258 /*
3259 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3260 * See spc4r17 section 5.3
3261 */
5951146d 3262 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3263 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3264 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3265 break;
3266 default:
6708bb27 3267 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 3268 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3269 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3270 goto out_unsupported_cdb;
3271 }
3272
3273 if (size != cmd->data_length) {
6708bb27 3274 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 3275 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3276 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3277 cmd->data_length, size, cdb[0]);
3278
3279 cmd->cmd_spdtl = size;
3280
3281 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 3282 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 3283 " WRITE data\n");
3284 goto out_invalid_cdb_field;
3285 }
3286 /*
3287 * Reject READ_* or WRITE_* with overflow/underflow for
3288 * type SCF_SCSI_DATA_SG_IO_CDB.
3289 */
6708bb27
AG		 3290 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3291 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 3292 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3293 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3294 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3295 goto out_invalid_cdb_field;
3296 }
3297
3298 if (size > cmd->data_length) {
3299 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3300 cmd->residual_count = (size - cmd->data_length);
3301 } else {
3302 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3303 cmd->residual_count = (cmd->data_length - size);
3304 }
3305 cmd->data_length = size;
3306 }
3307
d0229ae3
AG		 3308 /* Let's limit control cdbs to a page, for simplicity's sake. */
3309 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3310 size > PAGE_SIZE)
3311 goto out_invalid_cdb_field;
3312
c66ac9db
NB		 3313 transport_set_supported_SAM_opcode(cmd);
3314 return ret;
3315
3316out_unsupported_cdb:
3317 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3318 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3319 return -EINVAL;
c66ac9db
NB		 3320out_invalid_cdb_field:
3321 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3322 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3323 return -EINVAL;
c66ac9db
NB		 3324}
3325
c66ac9db 3326/*
35e0e757 3327 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 3328 * and ordered cmds need to have their tasks added to the execution queue.
3329 */
3330static void transport_complete_task_attr(struct se_cmd *cmd)
3331{
5951146d 3332 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3333 struct se_cmd *cmd_p, *cmd_tmp;
3334 int new_active_tasks = 0;
3335
e66ecd50 3336 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3337 atomic_dec(&dev->simple_cmds);
3338 smp_mb__after_atomic_dec();
3339 dev->dev_cur_ordered_id++;
6708bb27 3340 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3341 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3342 cmd->se_ordered_id);
e66ecd50 3343 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 3344 atomic_dec(&dev->dev_hoq_count);
3345 smp_mb__after_atomic_dec();
3346 dev->dev_cur_ordered_id++;
6708bb27 3347 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3348 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3349 cmd->se_ordered_id);
e66ecd50 3350 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db 3351 spin_lock(&dev->ordered_cmd_lock);
5951146d 3352 list_del(&cmd->se_ordered_node);
c66ac9db
NB		 3353 atomic_dec(&dev->dev_ordered_sync);
3354 smp_mb__after_atomic_dec();
3355 spin_unlock(&dev->ordered_cmd_lock);
3356
3357 dev->dev_cur_ordered_id++;
6708bb27 3358 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3359 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3360 }
3361 /*
3362 * Process all commands up to the last received
3363 * ORDERED task attribute which requires another blocking
3364 * boundary
3365 */
3366 spin_lock(&dev->delayed_cmd_lock);
3367 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3368 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3369
5951146d 3370 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3371 spin_unlock(&dev->delayed_cmd_lock);
3372
6708bb27 3373 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3374 " cmd_p: 0x%02x Task Attr: 0x%02x"
3375 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3376 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3377 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3378
3379 transport_add_tasks_from_cmd(cmd_p);
3380 new_active_tasks++;
3381
3382 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3383 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3384 break;
3385 }
3386 spin_unlock(&dev->delayed_cmd_lock);
3387 /*
3388 * If new tasks have become active, wake up the transport thread
3389 * to do the processing of the Active tasks.
3390 */
3391 if (new_active_tasks != 0)
e3d6f909 3392 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3393}
3394
e057f533 3395static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 3396{
3397 int ret = 0;
3398
e057f533
CH		 3399 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3400 transport_complete_task_attr(cmd);
3401
3402 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3403 ret = cmd->se_tfo->queue_status(cmd);
3404 if (ret)
3405 goto out;
3406 }
07bde79a
NB		 3407
3408 switch (cmd->data_direction) {
3409 case DMA_FROM_DEVICE:
3410 ret = cmd->se_tfo->queue_data_in(cmd);
3411 break;
3412 case DMA_TO_DEVICE:
ec98f782 3413 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3414 ret = cmd->se_tfo->queue_data_in(cmd);
3415 if (ret < 0)
e057f533 3416 break;
07bde79a
NB		 3417 }
3418 /* Fall through for DMA_TO_DEVICE */
3419 case DMA_NONE:
3420 ret = cmd->se_tfo->queue_status(cmd);
3421 break;
3422 default:
3423 break;
3424 }
3425
e057f533
CH		 3426out:
3427 if (ret < 0) {
3428 transport_handle_queue_full(cmd, cmd->se_dev);
3429 return;
3430 }
3431 transport_lun_remove_cmd(cmd);
3432 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3433}
3434
3435static void transport_handle_queue_full(
3436 struct se_cmd *cmd,
e057f533 3437 struct se_device *dev)
07bde79a
NB		 3438{
3439 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 3440 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3441 atomic_inc(&dev->dev_qf_count);
3442 smp_mb__after_atomic_inc();
3443 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3444
3445 schedule_work(&cmd->se_dev->qf_work_queue);
3446}
3447
35e0e757 3448static void target_complete_ok_work(struct work_struct *work)
c66ac9db 3449{
35e0e757 3450 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
07bde79a 3451 int reason = 0, ret;
35e0e757 3452
c66ac9db
NB		 3453 /*
3454 * Check if we need to move delayed/dormant tasks from cmds on the
3455 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3456 * Attribute.
3457 */
5951146d 3458 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3459 transport_complete_task_attr(cmd);
07bde79a
NB		 3460 /*
3461 * Check to schedule QUEUE_FULL work, or execute an existing
3462 * cmd->transport_qf_callback()
3463 */
3464 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3465 schedule_work(&cmd->se_dev->qf_work_queue);
3466
c66ac9db
NB		 3467 /*
3468 * Check if we need to retrieve a sense buffer from
3469 * the struct se_cmd in question.
3470 */
3471 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3472 if (transport_get_sense_data(cmd) < 0)
3473 reason = TCM_NON_EXISTENT_LUN;
3474
3475 /*
3476 * Only set when an struct se_task->task_scsi_status returned
3477 * a non GOOD status.
3478 */
3479 if (cmd->scsi_status) {
07bde79a 3480 ret = transport_send_check_condition_and_sense(
c66ac9db 3481 cmd, reason, 1);
07bde79a
NB		 3482 if (ret == -EAGAIN)
3483 goto queue_full;
3484
c66ac9db
NB		 3485 transport_lun_remove_cmd(cmd);
3486 transport_cmd_check_stop_to_fabric(cmd);
3487 return;
3488 }
3489 }
3490 /*
25985edc 3491 * Check for a callback, used by amongst other things
c66ac9db
NB		 3492 * XDWRITE_READ_10 emulation.
3493 */
3494 if (cmd->transport_complete_callback)
3495 cmd->transport_complete_callback(cmd);
3496
3497 switch (cmd->data_direction) {
3498 case DMA_FROM_DEVICE:
3499 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3500 if (cmd->se_lun->lun_sep) {
3501 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3502 cmd->data_length;
3503 }
3504 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3505
07bde79a
NB		 3506 ret = cmd->se_tfo->queue_data_in(cmd);
3507 if (ret == -EAGAIN)
3508 goto queue_full;
c66ac9db
NB		 3509 break;
3510 case DMA_TO_DEVICE:
3511 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3512 if (cmd->se_lun->lun_sep) {
3513 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3514 cmd->data_length;
3515 }
3516 spin_unlock(&cmd->se_lun->lun_sep_lock);
3517 /*
3518 * Check if we need to send READ payload for BIDI-COMMAND
3519 */
ec98f782 3520 if (cmd->t_bidi_data_sg) {
c66ac9db 3521 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3522 if (cmd->se_lun->lun_sep) {
3523 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3524 cmd->data_length;
3525 }
3526 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a
NB		 3527 ret = cmd->se_tfo->queue_data_in(cmd);
3528 if (ret == -EAGAIN)
3529 goto queue_full;
c66ac9db
NB		 3530 break;
3531 }
3532 /* Fall through for DMA_TO_DEVICE */
3533 case DMA_NONE:
07bde79a
NB		 3534 ret = cmd->se_tfo->queue_status(cmd);
3535 if (ret == -EAGAIN)
3536 goto queue_full;
c66ac9db
NB		 3537 break;
3538 default:
3539 break;
3540 }
3541
3542 transport_lun_remove_cmd(cmd);
3543 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3544 return;
3545
3546queue_full:
6708bb27 3547 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 3548 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 3549 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3550 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 3551}
3552
3553static void transport_free_dev_tasks(struct se_cmd *cmd)
3554{
3555 struct se_task *task, *task_tmp;
3556 unsigned long flags;
0c2cfe5f 3557 LIST_HEAD(dispose_list);
c66ac9db 3558
a1d8b49a 3559 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3560 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3561 &cmd->t_task_list, t_list) {
0c2cfe5f
CH		 3562 if (!(task->task_flags & TF_ACTIVE))
3563 list_move_tail(&task->t_list, &dispose_list);
3564 }
3565 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3566
3567 while (!list_empty(&dispose_list)) {
3568 task = list_first_entry(&dispose_list, struct se_task, t_list);
c66ac9db 3569
cc5d0f0f
CH		 3570 /*
3571 * We already cancelled all pending timers in
3572 * transport_complete_task, but that was just a pure del_timer,
3573 * so do a full del_timer_sync here to make sure any handler
3574 * that was running at that point has finished execution.
3575 */
3576 del_timer_sync(&task->task_timer);
3577
c66ac9db
NB		 3578 kfree(task->task_sg_bidi);
3579 kfree(task->task_sg);
3580
3581 list_del(&task->t_list);
3582
42bf829e 3583 cmd->se_dev->transport->free_task(task);
c66ac9db 3584 }
c66ac9db
NB		 3585}
3586
6708bb27 3587static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3588{
ec98f782 3589 struct scatterlist *sg;
ec98f782 3590 int count;
c66ac9db 3591
6708bb27
AG		 3592 for_each_sg(sgl, sg, nents, count)
3593 __free_page(sg_page(sg));
c66ac9db 3594
6708bb27
AG		 3595 kfree(sgl);
3596}
c66ac9db 3597
6708bb27
AG		 3598static inline void transport_free_pages(struct se_cmd *cmd)
3599{
3600 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3601 return;
3602
3603 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3604 cmd->t_data_sg = NULL;
3605 cmd->t_data_nents = 0;
c66ac9db 3606
6708bb27 3607 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3608 cmd->t_bidi_data_sg = NULL;
3609 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3610}
3611
d3df7825
CH		 3612/**
3613 * transport_put_cmd - release a reference to a command
3614 * @cmd: command to release
3615 *
3616 * This routine releases our reference to the command and frees it if possible.
3617 */
39c05f32 3618static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 3619{
3620 unsigned long flags;
4911e3cc 3621 int free_tasks = 0;
c66ac9db 3622
a1d8b49a 3623 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 3624 if (atomic_read(&cmd->t_fe_count)) {
3625 if (!atomic_dec_and_test(&cmd->t_fe_count))
3626 goto out_busy;
3627 }
3628
3629 if (atomic_read(&cmd->t_se_count)) {
3630 if (!atomic_dec_and_test(&cmd->t_se_count))
3631 goto out_busy;
3632 }
3633
3634 if (atomic_read(&cmd->transport_dev_active)) {
3635 atomic_set(&cmd->transport_dev_active, 0);
3636 transport_all_task_dev_remove_state(cmd);
3637 free_tasks = 1;
c66ac9db 3638 }
a1d8b49a 3639 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3640
4911e3cc
CH		 3641 if (free_tasks != 0)
3642 transport_free_dev_tasks(cmd);
d3df7825 3643
c66ac9db 3644 transport_free_pages(cmd);
31afc39c 3645 transport_release_cmd(cmd);
39c05f32 3646 return;
4911e3cc
CH		 3647out_busy:
3648 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3649}
3650
c66ac9db 3651/*
ec98f782
AG		 3652 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3653 * allocating in the core.
c66ac9db
NB		 3654 * @cmd: Associated se_cmd descriptor
3655 * @mem: SGL style memory for TCM WRITE / READ
3656 * @sg_mem_num: Number of SGL elements
3657 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3658 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3659 *
3660 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3661 * of parameters.
3662 */
3663int transport_generic_map_mem_to_cmd(
3664 struct se_cmd *cmd,
5951146d
AG		 3665 struct scatterlist *sgl,
3666 u32 sgl_count,
3667 struct scatterlist *sgl_bidi,
3668 u32 sgl_bidi_count)
c66ac9db 3669{
5951146d 3670 if (!sgl || !sgl_count)
c66ac9db 3671 return 0;
c66ac9db 3672
c66ac9db
NB		 3673 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3674 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
c66ac9db 3675
ec98f782
AG		 3676 cmd->t_data_sg = sgl;
3677 cmd->t_data_nents = sgl_count;
c66ac9db 3678
ec98f782
AG		 3679 if (sgl_bidi && sgl_bidi_count) {
3680 cmd->t_bidi_data_sg = sgl_bidi;
3681 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3682 }
3683 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3684 }
3685
3686 return 0;
3687}
3688EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3689
c66ac9db
NB		 3690static int transport_new_cmd_obj(struct se_cmd *cmd)
3691{
5951146d 3692 struct se_device *dev = cmd->se_dev;
01cde4d5 3693 int set_counts = 1, rc, task_cdbs;
c66ac9db 3694
ec98f782
AG		 3695 /*
3696 * Setup any BIDI READ tasks and memory from
3697 * cmd->t_mem_bidi_list so the READ struct se_tasks
3698 * are queued first for the non pSCSI passthrough case.
3699 */
3700 if (cmd->t_bidi_data_sg &&
3701 (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) {
3702 rc = transport_allocate_tasks(cmd,
3703 cmd->t_task_lba,
3704 DMA_FROM_DEVICE,
3705 cmd->t_bidi_data_sg,
3706 cmd->t_bidi_data_nents);
6708bb27 3707 if (rc <= 0) {
c66ac9db
NB		 3708 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3709 cmd->scsi_sense_reason =
ec98f782 3710 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
01cde4d5 3711 return -EINVAL;
c66ac9db 3712 }
ec98f782
AG		 3713 atomic_inc(&cmd->t_fe_count);
3714 atomic_inc(&cmd->t_se_count);
3715 set_counts = 0;
3716 }
3717 /*
3718 * Setup the tasks and memory from cmd->t_mem_list
3719 * Note for BIDI transfers this will contain the WRITE payload
3720 */
3721 task_cdbs = transport_allocate_tasks(cmd,
3722 cmd->t_task_lba,
3723 cmd->data_direction,
3724 cmd->t_data_sg,
3725 cmd->t_data_nents);
6708bb27 3726 if (task_cdbs <= 0) {
ec98f782
AG		 3727 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3728 cmd->scsi_sense_reason =
3729 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
01cde4d5 3730 return -EINVAL;
ec98f782 3731 }
c66ac9db 3732
ec98f782
AG		 3733 if (set_counts) {
3734 atomic_inc(&cmd->t_fe_count);
3735 atomic_inc(&cmd->t_se_count);
c66ac9db
NB		 3736 }
3737
ec98f782
AG		 3738 cmd->t_task_list_num = task_cdbs;
3739
a1d8b49a
AG		 3740 atomic_set(&cmd->t_task_cdbs_left, task_cdbs);
3741 atomic_set(&cmd->t_task_cdbs_ex_left, task_cdbs);
3742 atomic_set(&cmd->t_task_cdbs_timeout_left, task_cdbs);
c66ac9db
NB		 3743 return 0;
3744}
3745
05d1c7c0
AG		 3746void *transport_kmap_first_data_page(struct se_cmd *cmd)
3747{
ec98f782 3748 struct scatterlist *sg = cmd->t_data_sg;
05d1c7c0 3749
ec98f782 3750 BUG_ON(!sg);
05d1c7c0 3751 /*
ec98f782
AG		 3752 * We need to take into account a possible offset here for fabrics like
3753 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3754 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3755 */
ec98f782 3756 return kmap(sg_page(sg)) + sg->offset;
05d1c7c0
AG		 3757}
3758EXPORT_SYMBOL(transport_kmap_first_data_page);
3759
3760void transport_kunmap_first_data_page(struct se_cmd *cmd)
3761{
ec98f782 3762 kunmap(sg_page(cmd->t_data_sg));
05d1c7c0
AG		 3763}
3764EXPORT_SYMBOL(transport_kunmap_first_data_page);
3765
c66ac9db 3766static int
05d1c7c0 3767transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3768{
ec98f782
AG		 3769 u32 length = cmd->data_length;
3770 unsigned int nents;
3771 struct page *page;
3772 int i = 0;
c66ac9db 3773
ec98f782
AG		 3774 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3775 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3776 if (!cmd->t_data_sg)
3777 return -ENOMEM;
c66ac9db 3778
ec98f782
AG		 3779 cmd->t_data_nents = nents;
3780 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3781
ec98f782
AG		 3782 while (length) {
3783 u32 page_len = min_t(u32, length, PAGE_SIZE);
3784 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3785 if (!page)
3786 goto out;
c66ac9db 3787
ec98f782
AG		 3788 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3789 length -= page_len;
3790 i++;
c66ac9db 3791 }
c66ac9db 3792 return 0;
c66ac9db 3793
ec98f782
AG		 3794out:
3795 while (i >= 0) {
3796 __free_page(sg_page(&cmd->t_data_sg[i]));
3797 i--;
c66ac9db 3798 }
ec98f782
AG		 3799 kfree(cmd->t_data_sg);
3800 cmd->t_data_sg = NULL;
3801 return -ENOMEM;
c66ac9db
NB		 3802}
3803
a1d8b49a
AG		 3804/* Reduce sectors if they are too long for the device */
3805static inline sector_t transport_limit_task_sectors(
c66ac9db
NB		 3806 struct se_device *dev,
3807 unsigned long long lba,
a1d8b49a 3808 sector_t sectors)
c66ac9db 3809{
a1d8b49a 3810 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db 3811
a1d8b49a
AG		 3812 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3813 if ((lba + sectors) > transport_dev_end_lba(dev))
3814 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
c66ac9db 3815
a1d8b49a 3816 return sectors;
c66ac9db
NB		 3817}
3818
c66ac9db
NB		 3819
3820/*
3821 * This function can be used by HW target mode drivers to create a linked
3822 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3823 * This is intended to be called during the completion path by TCM Core
3824 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3825 */
3826void transport_do_task_sg_chain(struct se_cmd *cmd)
3827{
ec98f782
AG		 3828 struct scatterlist *sg_first = NULL;
3829 struct scatterlist *sg_prev = NULL;
3830 int sg_prev_nents = 0;
3831 struct scatterlist *sg;
c66ac9db 3832 struct se_task *task;
ec98f782 3833 u32 chained_nents = 0;
c66ac9db
NB		 3834 int i;
3835
ec98f782
AG		 3836 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3837
c66ac9db
NB		 3838 /*
3839 * Walk the struct se_task list and setup scatterlist chains
a1d8b49a 3840 * for each contiguously allocated struct se_task->task_sg[].
c66ac9db 3841 */
a1d8b49a 3842 list_for_each_entry(task, &cmd->t_task_list, t_list) {
ec98f782 3843 if (!task->task_sg)
c66ac9db
NB		 3844 continue;
3845
ec98f782
AG		 3846 if (!sg_first) {
3847 sg_first = task->task_sg;
6708bb27 3848 chained_nents = task->task_sg_nents;
97868c89 3849 } else {
ec98f782 3850 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
6708bb27 3851 chained_nents += task->task_sg_nents;
97868c89 3852 }
c3c74c7a
NB		 3853 /*
3854 * For the padded tasks, use the extra SGL vector allocated
3855 * in transport_allocate_data_tasks() for the sg_prev_nents
04629b7b
CH		 3856 * offset into sg_chain() above.
3857 *
3858 * We do not need the padding for the last task (or a single
3859 * task), but in that case we will never use the sg_prev_nents
3860 * value below which would be incorrect.
c3c74c7a 3861 */
04629b7b 3862 sg_prev_nents = (task->task_sg_nents + 1);
ec98f782 3863 sg_prev = task->task_sg;
c66ac9db
NB		 3864 }
3865 /*
3866 * Setup the starting pointer and total t_tasks_sg_linked_no including
3867 * padding SGs for linking and to mark the end.
3868 */
a1d8b49a 3869 cmd->t_tasks_sg_chained = sg_first;
ec98f782 3870 cmd->t_tasks_sg_chained_no = chained_nents;
c66ac9db 3871
6708bb27 3872 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
a1d8b49a
AG		 3873 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3874 cmd->t_tasks_sg_chained_no);
c66ac9db 3875
a1d8b49a
AG		 3876 for_each_sg(cmd->t_tasks_sg_chained, sg,
3877 cmd->t_tasks_sg_chained_no, i) {
c66ac9db 3878
6708bb27 3879 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
5951146d 3880 i, sg, sg_page(sg), sg->length, sg->offset);
c66ac9db 3881 if (sg_is_chain(sg))
6708bb27 3882 pr_debug("SG: %p sg_is_chain=1\n", sg);
c66ac9db 3883 if (sg_is_last(sg))
6708bb27 3884 pr_debug("SG: %p sg_is_last=1\n", sg);
c66ac9db 3885 }
c66ac9db
NB		 3886}
3887EXPORT_SYMBOL(transport_do_task_sg_chain);
3888
a1d8b49a
AG		 3889/*
3890 * Break up cmd into chunks transport can handle
3891 */
ec98f782 3892static int transport_allocate_data_tasks(
c66ac9db
NB		 3893 struct se_cmd *cmd,
3894 unsigned long long lba,
c66ac9db 3895 enum dma_data_direction data_direction,
ec98f782
AG		 3896 struct scatterlist *sgl,
3897 unsigned int sgl_nents)
c66ac9db 3898{
c66ac9db 3899 struct se_task *task;
5951146d 3900 struct se_device *dev = cmd->se_dev;
ec98f782 3901 unsigned long flags;
a3eedc22 3902 int task_count, i;
277c5f27 3903 sector_t sectors, dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
ec98f782
AG		 3904 u32 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
3905 struct scatterlist *sg;
3906 struct scatterlist *cmd_sg;
a1d8b49a 3907
ec98f782
AG		 3908 WARN_ON(cmd->data_length % sector_size);
3909 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
277c5f27
NB		 3910 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
3911
ec98f782
AG		 3912 cmd_sg = sgl;
3913 for (i = 0; i < task_count; i++) {
c3c74c7a 3914 unsigned int task_size, task_sg_nents_padded;
ec98f782 3915 int count;
a1d8b49a 3916
c66ac9db 3917 task = transport_generic_get_task(cmd, data_direction);
a1d8b49a 3918 if (!task)
ec98f782 3919 return -ENOMEM;
c66ac9db 3920
c66ac9db 3921 task->task_lba = lba;
ec98f782
AG		 3922 task->task_sectors = min(sectors, dev_max_sectors);
3923 task->task_size = task->task_sectors * sector_size;
c66ac9db 3924
525a48a2
NB		 3925 /*
3926 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3927 * in order to calculate the number per task SGL entries
3928 */
3929 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
c66ac9db 3930 /*
ec98f782
AG		 3931 * Check if the fabric module driver is requesting that all
3932 * struct se_task->task_sg[] be chained together.. If so,
3933 * then allocate an extra padding SG entry for linking and
c3c74c7a
NB		 3934 * marking the end of the chained SGL for every task except
3935 * the last one for (task_count > 1) operation, or skipping
3936 * the extra padding for the (task_count == 1) case.
c66ac9db 3937 */
c3c74c7a
NB		 3938 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3939 task_sg_nents_padded = (task->task_sg_nents + 1);
c3c74c7a
NB		 3940 } else
3941 task_sg_nents_padded = task->task_sg_nents;
c66ac9db 3942
1d20bb61 3943 task->task_sg = kmalloc(sizeof(struct scatterlist) *
c3c74c7a 3944 task_sg_nents_padded, GFP_KERNEL);
ec98f782
AG		 3945 if (!task->task_sg) {
3946 cmd->se_dev->transport->free_task(task);
3947 return -ENOMEM;
3948 }
3949
c3c74c7a 3950 sg_init_table(task->task_sg, task_sg_nents_padded);
c66ac9db 3951
ec98f782
AG		 3952 task_size = task->task_size;
3953
3954 /* Build new sgl, only up to task_size */
6708bb27 3955 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
ec98f782
AG		 3956 if (cmd_sg->length > task_size)
3957 break;
3958
3959 *sg = *cmd_sg;
3960 task_size -= cmd_sg->length;
3961 cmd_sg = sg_next(cmd_sg);
c66ac9db 3962 }
c66ac9db 3963
ec98f782
AG		 3964 lba += task->task_sectors;
3965 sectors -= task->task_sectors;
c66ac9db 3966
ec98f782
AG		 3967 spin_lock_irqsave(&cmd->t_state_lock, flags);
3968 list_add_tail(&task->t_list, &cmd->t_task_list);
3969 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3970 }
3971
ec98f782 3972 return task_count;
c66ac9db
NB		 3973}
3974
3975static int
ec98f782 3976transport_allocate_control_task(struct se_cmd *cmd)
c66ac9db 3977{
c66ac9db 3978 struct se_task *task;
ec98f782 3979 unsigned long flags;
c66ac9db
NB		 3980
3981 task = transport_generic_get_task(cmd, cmd->data_direction);
3982 if (!task)
ec98f782 3983 return -ENOMEM;
c66ac9db 3984
ec98f782
AG		 3985 task->task_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
3986 GFP_KERNEL);
3987 if (!task->task_sg) {
3988 cmd->se_dev->transport->free_task(task);
3989 return -ENOMEM;
3990 }
3991
3992 memcpy(task->task_sg, cmd->t_data_sg,
3993 sizeof(struct scatterlist) * cmd->t_data_nents);
c66ac9db 3994 task->task_size = cmd->data_length;
6708bb27 3995 task->task_sg_nents = cmd->t_data_nents;
c66ac9db 3996
ec98f782
AG		 3997 spin_lock_irqsave(&cmd->t_state_lock, flags);
3998 list_add_tail(&task->t_list, &cmd->t_task_list);
3999 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4000
6708bb27 4001 /* Success! Return number of tasks allocated */
a3eedc22 4002 return 1;
ec98f782
AG		 4003}
4004
4005static u32 transport_allocate_tasks(
4006 struct se_cmd *cmd,
4007 unsigned long long lba,
4008 enum dma_data_direction data_direction,
4009 struct scatterlist *sgl,
4010 unsigned int sgl_nents)
4011{
01cde4d5
NB		 4012 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
4013 if (transport_cmd_get_valid_sectors(cmd) < 0)
4014 return -EINVAL;
4015
ec98f782
AG		 4016 return transport_allocate_data_tasks(cmd, lba, data_direction,
4017 sgl, sgl_nents);
01cde4d5 4018 } else
6708bb27
AG		 4019 return transport_allocate_control_task(cmd);
4020
c66ac9db
NB		 4021}
4022
ec98f782 4023
c66ac9db
NB		 4024/* transport_generic_new_cmd(): Called from transport_processing_thread()
4025 *
4026 * Allocate storage transport resources from a set of values predefined
4027 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4028 * Any non zero return here is treated as an "out of resource' op here.
4029 */
4030 /*
4031 * Generate struct se_task(s) and/or their payloads for this CDB.
4032 */
a1d8b49a 4033int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 4034{
c66ac9db
NB		 4035 int ret = 0;
4036
4037 /*
4038 * Determine is the TCM fabric module has already allocated physical
4039 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 4040 * beforehand.
c66ac9db 4041 */
ec98f782
AG		 4042 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
4043 cmd->data_length) {
05d1c7c0 4044 ret = transport_generic_get_mem(cmd);
c66ac9db
NB		 4045 if (ret < 0)
4046 return ret;
4047 }
1d20bb61
NB		 4048 /*
4049 * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4050 * control or data CDB types, and perform the map to backend subsystem
4051 * code from SGL memory allocated here by transport_generic_get_mem(), or
4052 * via pre-existing SGL memory setup explictly by fabric module code with
4053 * transport_generic_map_mem_to_cmd().
4054 */
c66ac9db
NB		 4055 ret = transport_new_cmd_obj(cmd);
4056 if (ret < 0)
4057 return ret;
c66ac9db 4058 /*
a1d8b49a 4059 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 4060 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4061 * will be added to the struct se_device execution queue after its WRITE
4062 * data has arrived. (ie: It gets handled by the transport processing
4063 * thread a second time)
4064 */
4065 if (cmd->data_direction == DMA_TO_DEVICE) {
4066 transport_add_tasks_to_state_queue(cmd);
4067 return transport_generic_write_pending(cmd);
4068 }
4069 /*
4070 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4071 * to the execution queue.
4072 */
4073 transport_execute_tasks(cmd);
4074 return 0;
4075}
a1d8b49a 4076EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 4077
4078/* transport_generic_process_write():
4079 *
4080 *
4081 */
4082void transport_generic_process_write(struct se_cmd *cmd)
4083{
c66ac9db
NB		 4084 transport_execute_tasks(cmd);
4085}
4086EXPORT_SYMBOL(transport_generic_process_write);
4087
e057f533 4088static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 4089{
e057f533
CH		 4090 if (cmd->se_tfo->write_pending(cmd) == -EAGAIN) {
4091 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
4092 cmd);
4093 transport_handle_queue_full(cmd, cmd->se_dev);
4094 }
07bde79a
NB		 4095}
4096
c66ac9db
NB		 4097static int transport_generic_write_pending(struct se_cmd *cmd)
4098{
4099 unsigned long flags;
4100 int ret;
4101
a1d8b49a 4102 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4103 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 4104 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a 4105
c66ac9db
NB		 4106 /*
4107 * Clear the se_cmd for WRITE_PENDING status in order to set
a1d8b49a 4108 * cmd->t_transport_active=0 so that transport_generic_handle_data
c66ac9db 4109 * can be called from HW target mode interrupt code. This is safe
e3d6f909 4110 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 4111 * because the se_cmd->se_lun pointer is not being cleared.
4112 */
4113 transport_cmd_check_stop(cmd, 1, 0);
4114
4115 /*
4116 * Call the fabric write_pending function here to let the
4117 * frontend know that WRITE buffers are ready.
4118 */
e3d6f909 4119 ret = cmd->se_tfo->write_pending(cmd);
07bde79a
NB		 4120 if (ret == -EAGAIN)
4121 goto queue_full;
4122 else if (ret < 0)
c66ac9db
NB		 4123 return ret;
4124
4125 return PYX_TRANSPORT_WRITE_PENDING;
07bde79a
NB		 4126
4127queue_full:
6708bb27 4128 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a 4129 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
e057f533 4130 transport_handle_queue_full(cmd, cmd->se_dev);
07bde79a 4131 return ret;
c66ac9db
NB		 4132}
4133
2dbc43d2
CH		 4134/**
4135 * transport_release_cmd - free a command
4136 * @cmd: command to free
4137 *
4138 * This routine unconditionally frees a command, and reference counting
4139 * or list removal must be done in the caller.
4140 */
35462975 4141void transport_release_cmd(struct se_cmd *cmd)
c66ac9db 4142{
e3d6f909 4143 BUG_ON(!cmd->se_tfo);
c66ac9db 4144
2dbc43d2
CH		 4145 if (cmd->se_tmr_req)
4146 core_tmr_release_req(cmd->se_tmr_req);
4147 if (cmd->t_task_cdb != cmd->__t_task_cdb)
4148 kfree(cmd->t_task_cdb);
35462975 4149 cmd->se_tfo->release_cmd(cmd);
c66ac9db 4150}
35462975 4151EXPORT_SYMBOL(transport_release_cmd);
c66ac9db 4152
39c05f32 4153void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 4154{
d14921d6
NB		 4155 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
4156 if (wait_for_tasks && cmd->se_tmr_req)
4157 transport_wait_for_tasks(cmd);
4158
35462975 4159 transport_release_cmd(cmd);
d14921d6
NB		 4160 } else {
4161 if (wait_for_tasks)
4162 transport_wait_for_tasks(cmd);
4163
c66ac9db
NB		 4164 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
4165
82f1c8a4 4166 if (cmd->se_lun)
c66ac9db 4167 transport_lun_remove_cmd(cmd);
c66ac9db 4168
f4366772
NB		 4169 transport_free_dev_tasks(cmd);
4170
39c05f32 4171 transport_put_cmd(cmd);
c66ac9db
NB		 4172 }
4173}
4174EXPORT_SYMBOL(transport_generic_free_cmd);
4175
c66ac9db
NB		 4176/* transport_lun_wait_for_tasks():
4177 *
4178 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4179 * an struct se_lun to be successfully shutdown.
4180 */
4181static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4182{
4183 unsigned long flags;
4184 int ret;
4185 /*
4186 * If the frontend has already requested this struct se_cmd to
4187 * be stopped, we can safely ignore this struct se_cmd.
4188 */
a1d8b49a
AG		 4189 spin_lock_irqsave(&cmd->t_state_lock, flags);
4190 if (atomic_read(&cmd->t_transport_stop)) {
4191 atomic_set(&cmd->transport_lun_stop, 0);
6708bb27 4192 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
e3d6f909 4193 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4194 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4195 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 4196 return -EPERM;
c66ac9db 4197 }
a1d8b49a
AG		 4198 atomic_set(&cmd->transport_lun_fe_stop, 1);
4199 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4200
5951146d 4201 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 4202
4203 ret = transport_stop_tasks_for_cmd(cmd);
4204
6708bb27
AG		 4205 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4206 " %d\n", cmd, cmd->t_task_list_num, ret);
c66ac9db 4207 if (!ret) {
6708bb27 4208 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 4209 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4210 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 4211 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 4212 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4213 }
3df8d40b 4214 transport_remove_cmd_from_queue(cmd);
c66ac9db
NB		 4215
4216 return 0;
4217}
4218
c66ac9db
NB		 4219static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4220{
4221 struct se_cmd *cmd = NULL;
4222 unsigned long lun_flags, cmd_flags;
4223 /*
4224 * Do exception processing and return CHECK_CONDITION status to the
4225 * Initiator Port.
4226 */
4227 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 4228 while (!list_empty(&lun->lun_cmd_list)) {
4229 cmd = list_first_entry(&lun->lun_cmd_list,
4230 struct se_cmd, se_lun_node);
4231 list_del(&cmd->se_lun_node);
4232
a1d8b49a 4233 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db
NB		 4234 /*
4235 * This will notify iscsi_target_transport.c:
4236 * transport_cmd_check_stop() that a LUN shutdown is in
4237 * progress for the iscsi_cmd_t.
4238 */
a1d8b49a 4239 spin_lock(&cmd->t_state_lock);
6708bb27 4240 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 4241 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 4242 cmd->se_lun->unpacked_lun,
4243 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a
AG		 4244 atomic_set(&cmd->transport_lun_stop, 1);
4245 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 4246
4247 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4248
6708bb27
AG		 4249 if (!cmd->se_lun) {
4250 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 4251 cmd->se_tfo->get_task_tag(cmd),
4252 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 4253 BUG();
4254 }
4255 /*
4256 * If the Storage engine still owns the iscsi_cmd_t, determine
4257 * and/or stop its context.
4258 */
6708bb27 4259 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 4260 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4261 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4262
e3d6f909 4263 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 4264 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4265 continue;
4266 }
4267
6708bb27 4268 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 4269 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 4270 cmd->se_lun->unpacked_lun,
4271 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4272
a1d8b49a 4273 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
6708bb27 4274 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 4275 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4276 goto check_cond;
4277 }
a1d8b49a 4278 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 4279 transport_all_task_dev_remove_state(cmd);
a1d8b49a 4280 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4281
4282 transport_free_dev_tasks(cmd);
4283 /*
4284 * The Storage engine stopped this struct se_cmd before it was
4285 * send to the fabric frontend for delivery back to the
4286 * Initiator Node. Return this SCSI CDB back with an
4287 * CHECK_CONDITION status.
4288 */
4289check_cond:
4290 transport_send_check_condition_and_sense(cmd,
4291 TCM_NON_EXISTENT_LUN, 0);
4292 /*
4293 * If the fabric frontend is waiting for this iscsi_cmd_t to
4294 * be released, notify the waiting thread now that LU has
4295 * finished accessing it.
4296 */
a1d8b49a
AG		 4297 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4298 if (atomic_read(&cmd->transport_lun_fe_stop)) {
6708bb27 4299 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 4300 " struct se_cmd: %p ITT: 0x%08x\n",
4301 lun->unpacked_lun,
e3d6f909 4302 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4303
a1d8b49a 4304 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 4305 cmd_flags);
4306 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 4307 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 4308 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4309 continue;
4310 }
6708bb27 4311 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 4312 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4313
a1d8b49a 4314 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4315 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4316 }
4317 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4318}
4319
4320static int transport_clear_lun_thread(void *p)
4321{
4322 struct se_lun *lun = (struct se_lun *)p;
4323
4324 __transport_clear_lun_from_sessions(lun);
4325 complete(&lun->lun_shutdown_comp);
4326
4327 return 0;
4328}
4329
4330int transport_clear_lun_from_sessions(struct se_lun *lun)
4331{
4332 struct task_struct *kt;
4333
5951146d 4334 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 4335 "tcm_cl_%u", lun->unpacked_lun);
4336 if (IS_ERR(kt)) {
6708bb27 4337 pr_err("Unable to start clear_lun thread\n");
e3d6f909 4338 return PTR_ERR(kt);
c66ac9db
NB		 4339 }
4340 wait_for_completion(&lun->lun_shutdown_comp);
4341
4342 return 0;
4343}
4344
d14921d6
NB		 4345/**
4346 * transport_wait_for_tasks - wait for completion to occur
4347 * @cmd: command to wait
c66ac9db 4348 *
d14921d6
NB		 4349 * Called from frontend fabric context to wait for storage engine
4350 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 4351 */
d14921d6 4352void transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 4353{
4354 unsigned long flags;
4355
a1d8b49a 4356 spin_lock_irqsave(&cmd->t_state_lock, flags);
d14921d6
NB		 4357 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4358 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4359 return;
4360 }
4361 /*
4362 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4363 * has been set in transport_set_supported_SAM_opcode().
4364 */
4365 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4366 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4367 return;
4368 }
c66ac9db
NB		 4369 /*
4370 * If we are already stopped due to an external event (ie: LUN shutdown)
4371 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 4372 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 4373 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4374 * has completed its operation on the struct se_cmd.
4375 */
a1d8b49a 4376 if (atomic_read(&cmd->transport_lun_stop)) {
c66ac9db 4377
6708bb27 4378 pr_debug("wait_for_tasks: Stopping"
e3d6f909 4379 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 4380 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 4381 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4382 /*
4383 * There is a special case for WRITES where a FE exception +
4384 * LUN shutdown means ConfigFS context is still sleeping on
4385 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4386 * We go ahead and up transport_lun_stop_comp just to be sure
4387 * here.
4388 */
a1d8b49a
AG		 4389 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4390 complete(&cmd->transport_lun_stop_comp);
4391 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4392 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4393
4394 transport_all_task_dev_remove_state(cmd);
4395 /*
4396 * At this point, the frontend who was the originator of this
4397 * struct se_cmd, now owns the structure and can be released through
4398 * normal means below.
4399 */
6708bb27 4400 pr_debug("wait_for_tasks: Stopped"
e3d6f909 4401 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 4402 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 4403 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4404
a1d8b49a 4405 atomic_set(&cmd->transport_lun_stop, 0);
c66ac9db 4406 }
a1d8b49a 4407 if (!atomic_read(&cmd->t_transport_active) ||
d14921d6
NB		 4408 atomic_read(&cmd->t_transport_aborted)) {
4409 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4410 return;
4411 }
c66ac9db 4412
a1d8b49a 4413 atomic_set(&cmd->t_transport_stop, 1);
c66ac9db 4414
6708bb27 4415 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
f2da9dbd
CH		 4416 " i_state: %d, t_state: %d, t_transport_stop = TRUE\n",
4417 cmd, cmd->se_tfo->get_task_tag(cmd),
4418 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 4419
a1d8b49a 4420 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4421
5951146d 4422 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 4423
a1d8b49a 4424 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 4425
a1d8b49a
AG		 4426 spin_lock_irqsave(&cmd->t_state_lock, flags);
4427 atomic_set(&cmd->t_transport_active, 0);
4428 atomic_set(&cmd->t_transport_stop, 0);
c66ac9db 4429
6708bb27 4430 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4431 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4432 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4433
d14921d6 4434 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4435}
d14921d6 4436EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 4437
4438static int transport_get_sense_codes(
4439 struct se_cmd *cmd,
4440 u8 *asc,
4441 u8 *ascq)
4442{
4443 *asc = cmd->scsi_asc;
4444 *ascq = cmd->scsi_ascq;
4445
4446 return 0;
4447}
4448
4449static int transport_set_sense_codes(
4450 struct se_cmd *cmd,
4451 u8 asc,
4452 u8 ascq)
4453{
4454 cmd->scsi_asc = asc;
4455 cmd->scsi_ascq = ascq;
4456
4457 return 0;
4458}
4459
4460int transport_send_check_condition_and_sense(
4461 struct se_cmd *cmd,
4462 u8 reason,
4463 int from_transport)
4464{
4465 unsigned char *buffer = cmd->sense_buffer;
4466 unsigned long flags;
4467 int offset;
4468 u8 asc = 0, ascq = 0;
4469
a1d8b49a 4470 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4471 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4472 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4473 return 0;
4474 }
4475 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4476 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4477
4478 if (!reason && from_transport)
4479 goto after_reason;
4480
4481 if (!from_transport)
4482 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4483 /*
4484 * Data Segment and SenseLength of the fabric response PDU.
4485 *
4486 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4487 * from include/scsi/scsi_cmnd.h
4488 */
e3d6f909 4489 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4490 TRANSPORT_SENSE_BUFFER);
4491 /*
4492 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4493 * SENSE KEY values from include/scsi/scsi.h
4494 */
4495 switch (reason) {
4496 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4497 /* CURRENT ERROR */
4498 buffer[offset] = 0x70;
4499 /* ILLEGAL REQUEST */
4500 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4501 /* LOGICAL UNIT NOT SUPPORTED */
4502 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4503 break;
c66ac9db
NB		 4504 case TCM_UNSUPPORTED_SCSI_OPCODE:
4505 case TCM_SECTOR_COUNT_TOO_MANY:
4506 /* CURRENT ERROR */
4507 buffer[offset] = 0x70;
4508 /* ILLEGAL REQUEST */
4509 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4510 /* INVALID COMMAND OPERATION CODE */
4511 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4512 break;
4513 case TCM_UNKNOWN_MODE_PAGE:
4514 /* CURRENT ERROR */
4515 buffer[offset] = 0x70;
4516 /* ILLEGAL REQUEST */
4517 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4518 /* INVALID FIELD IN CDB */
4519 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4520 break;
4521 case TCM_CHECK_CONDITION_ABORT_CMD:
4522 /* CURRENT ERROR */
4523 buffer[offset] = 0x70;
4524 /* ABORTED COMMAND */
4525 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4526 /* BUS DEVICE RESET FUNCTION OCCURRED */
4527 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4528 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4529 break;
4530 case TCM_INCORRECT_AMOUNT_OF_DATA:
4531 /* CURRENT ERROR */
4532 buffer[offset] = 0x70;
4533 /* ABORTED COMMAND */
4534 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4535 /* WRITE ERROR */
4536 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4537 /* NOT ENOUGH UNSOLICITED DATA */
4538 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4539 break;
4540 case TCM_INVALID_CDB_FIELD:
4541 /* CURRENT ERROR */
4542 buffer[offset] = 0x70;
4543 /* ABORTED COMMAND */
4544 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4545 /* INVALID FIELD IN CDB */
4546 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4547 break;
4548 case TCM_INVALID_PARAMETER_LIST:
4549 /* CURRENT ERROR */
4550 buffer[offset] = 0x70;
4551 /* ABORTED COMMAND */
4552 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4553 /* INVALID FIELD IN PARAMETER LIST */
4554 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4555 break;
4556 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4557 /* CURRENT ERROR */
4558 buffer[offset] = 0x70;
4559 /* ABORTED COMMAND */
4560 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4561 /* WRITE ERROR */
4562 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4563 /* UNEXPECTED_UNSOLICITED_DATA */
4564 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4565 break;
4566 case TCM_SERVICE_CRC_ERROR:
4567 /* CURRENT ERROR */
4568 buffer[offset] = 0x70;
4569 /* ABORTED COMMAND */
4570 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4571 /* PROTOCOL SERVICE CRC ERROR */
4572 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4573 /* N/A */
4574 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4575 break;
4576 case TCM_SNACK_REJECTED:
4577 /* CURRENT ERROR */
4578 buffer[offset] = 0x70;
4579 /* ABORTED COMMAND */
4580 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4581 /* READ ERROR */
4582 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4583 /* FAILED RETRANSMISSION REQUEST */
4584 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4585 break;
4586 case TCM_WRITE_PROTECTED:
4587 /* CURRENT ERROR */
4588 buffer[offset] = 0x70;
4589 /* DATA PROTECT */
4590 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4591 /* WRITE PROTECTED */
4592 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4593 break;
4594 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4595 /* CURRENT ERROR */
4596 buffer[offset] = 0x70;
4597 /* UNIT ATTENTION */
4598 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4599 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4600 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4601 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4602 break;
4603 case TCM_CHECK_CONDITION_NOT_READY:
4604 /* CURRENT ERROR */
4605 buffer[offset] = 0x70;
4606 /* Not Ready */
4607 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4608 transport_get_sense_codes(cmd, &asc, &ascq);
4609 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4610 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4611 break;
4612 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4613 default:
4614 /* CURRENT ERROR */
4615 buffer[offset] = 0x70;
4616 /* ILLEGAL REQUEST */
4617 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4618 /* LOGICAL UNIT COMMUNICATION FAILURE */
4619 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4620 break;
4621 }
4622 /*
4623 * This code uses linux/include/scsi/scsi.h SAM status codes!
4624 */
4625 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4626 /*
4627 * Automatically padded, this value is encoded in the fabric's
4628 * data_length response PDU containing the SCSI defined sense data.
4629 */
4630 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4631
4632after_reason:
07bde79a 4633 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4634}
4635EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4636
4637int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4638{
4639 int ret = 0;
4640
a1d8b49a 4641 if (atomic_read(&cmd->t_transport_aborted) != 0) {
6708bb27 4642 if (!send_status ||
c66ac9db
NB		 4643 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4644 return 1;
4645#if 0
6708bb27 4646 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4647 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4648 cmd->t_task_cdb[0],
e3d6f909 4649 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4650#endif
4651 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4652 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4653 ret = 1;
4654 }
4655 return ret;
4656}
4657EXPORT_SYMBOL(transport_check_aborted_status);
4658
4659void transport_send_task_abort(struct se_cmd *cmd)
4660{
c252f003
NB		 4661 unsigned long flags;
4662
4663 spin_lock_irqsave(&cmd->t_state_lock, flags);
4664 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4665 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4666 return;
4667 }
4668 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4669
c66ac9db
NB		 4670 /*
4671 * If there are still expected incoming fabric WRITEs, we wait
4672 * until until they have completed before sending a TASK_ABORTED
4673 * response. This response with TASK_ABORTED status will be
4674 * queued back to fabric module by transport_check_aborted_status().
4675 */
4676 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4677 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
a1d8b49a 4678 atomic_inc(&cmd->t_transport_aborted);
c66ac9db
NB		 4679 smp_mb__after_atomic_inc();
4680 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4681 transport_new_cmd_failure(cmd);
4682 return;
4683 }
4684 }
4685 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4686#if 0
6708bb27 4687 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4688 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4689 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4690#endif
e3d6f909 4691 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4692}
4693
4694/* transport_generic_do_tmr():
4695 *
4696 *
4697 */
4698int transport_generic_do_tmr(struct se_cmd *cmd)
4699{
5951146d 4700 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4701 struct se_tmr_req *tmr = cmd->se_tmr_req;
4702 int ret;
4703
4704 switch (tmr->function) {
5c6cd613 4705 case TMR_ABORT_TASK:
c66ac9db
NB		 4706 tmr->response = TMR_FUNCTION_REJECTED;
4707 break;
5c6cd613
NB		 4708 case TMR_ABORT_TASK_SET:
4709 case TMR_CLEAR_ACA:
4710 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4711 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4712 break;
5c6cd613 4713 case TMR_LUN_RESET:
c66ac9db
NB		 4714 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4715 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4716 TMR_FUNCTION_REJECTED;
4717 break;
5c6cd613 4718 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4719 tmr->response = TMR_FUNCTION_REJECTED;
4720 break;
5c6cd613 4721 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4722 tmr->response = TMR_FUNCTION_REJECTED;
4723 break;
c66ac9db 4724 default:
6708bb27 4725 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4726 tmr->function);
4727 tmr->response = TMR_FUNCTION_REJECTED;
4728 break;
4729 }
4730
4731 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4732 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 4733
b7b8bef7 4734 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 4735 return 0;
4736}
4737
c66ac9db
NB		 4738/* transport_processing_thread():
4739 *
4740 *
4741 */
4742static int transport_processing_thread(void *param)
4743{
5951146d 4744 int ret;
c66ac9db
NB		 4745 struct se_cmd *cmd;
4746 struct se_device *dev = (struct se_device *) param;
c66ac9db
NB		 4747
4748 set_user_nice(current, -20);
4749
4750 while (!kthread_should_stop()) {
e3d6f909
AG		 4751 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4752 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 4753 kthread_should_stop());
4754 if (ret < 0)
4755 goto out;
4756
c66ac9db
NB		 4757get_cmd:
4758 __transport_execute_tasks(dev);
4759
5951146d
AG		 4760 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4761 if (!cmd)
c66ac9db
NB		 4762 continue;
4763
5951146d 4764 switch (cmd->t_state) {
680b73c5
CH		 4765 case TRANSPORT_NEW_CMD:
4766 BUG();
4767 break;
c66ac9db 4768 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 4769 if (!cmd->se_tfo->new_cmd_map) {
4770 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 4771 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4772 BUG();
4773 }
e3d6f909 4774 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db
NB		 4775 if (ret < 0) {
4776 cmd->transport_error_status = ret;
4499dda8 4777 transport_generic_request_failure(cmd,
c66ac9db
NB		 4778 0, (cmd->data_direction !=
4779 DMA_TO_DEVICE));
4780 break;
4781 }
c66ac9db 4782 ret = transport_generic_new_cmd(cmd);
07bde79a
NB		 4783 if (ret == -EAGAIN)
4784 break;
4785 else if (ret < 0) {
c66ac9db 4786 cmd->transport_error_status = ret;
4499dda8 4787 transport_generic_request_failure(cmd,
c66ac9db
NB		 4788 0, (cmd->data_direction !=
4789 DMA_TO_DEVICE));
4790 }
4791 break;
4792 case TRANSPORT_PROCESS_WRITE:
4793 transport_generic_process_write(cmd);
4794 break;
f4366772 4795 case TRANSPORT_FREE_CMD_INTR:
82f1c8a4 4796 transport_generic_free_cmd(cmd, 0);
f4366772 4797 break;
c66ac9db
NB		 4798 case TRANSPORT_PROCESS_TMR:
4799 transport_generic_do_tmr(cmd);
4800 break;
07bde79a 4801 case TRANSPORT_COMPLETE_QF_WP:
e057f533
CH		 4802 transport_write_pending_qf(cmd);
4803 break;
4804 case TRANSPORT_COMPLETE_QF_OK:
4805 transport_complete_qf(cmd);
07bde79a 4806 break;
c66ac9db 4807 default:
f2da9dbd
CH		 4808 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4809 "i_state: %d on SE LUN: %u\n",
4810 cmd->t_state,
e3d6f909
AG		 4811 cmd->se_tfo->get_task_tag(cmd),
4812 cmd->se_tfo->get_cmd_state(cmd),
4813 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 4814 BUG();
4815 }
4816
4817 goto get_cmd;
4818 }
4819
4820out:
ce8762f6
NB		 4821 WARN_ON(!list_empty(&dev->state_task_list));
4822 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
c66ac9db
NB		 4823 dev->process_thread = NULL;
4824 return 0;
4825}
Linux kernel - Deliverables
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