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target: factor some duplicate code for stopping a task
[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
NB		 60
61static struct kmem_cache *se_cmd_cache;
62static struct kmem_cache *se_sess_cache;
63struct kmem_cache *se_tmr_req_cache;
64struct kmem_cache *se_ua_cache;
c66ac9db
NB		 65struct kmem_cache *t10_pr_reg_cache;
66struct kmem_cache *t10_alua_lu_gp_cache;
67struct kmem_cache *t10_alua_lu_gp_mem_cache;
68struct kmem_cache *t10_alua_tg_pt_gp_cache;
69struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
70
c66ac9db 71static int transport_generic_write_pending(struct se_cmd *);
5951146d 72static int transport_processing_thread(void *param);
c66ac9db
NB		 73static int __transport_execute_tasks(struct se_device *dev);
74static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 75static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 76 struct se_device *dev);
c66ac9db
NB		 77static void transport_direct_request_timeout(struct se_cmd *cmd);
78static void transport_free_dev_tasks(struct se_cmd *cmd);
a1d8b49a 79static u32 transport_allocate_tasks(struct se_cmd *cmd,
ec98f782 80 unsigned long long starting_lba,
c66ac9db 81 enum dma_data_direction data_direction,
ec98f782 82 struct scatterlist *sgl, unsigned int nents);
05d1c7c0 83static int transport_generic_get_mem(struct se_cmd *cmd);
39c05f32 84static void transport_put_cmd(struct se_cmd *cmd);
3df8d40b 85static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
c66ac9db
NB		 86static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
87static void transport_stop_all_task_timers(struct se_cmd *cmd);
88
e3d6f909 89int init_se_kmem_caches(void)
c66ac9db 90{
c66ac9db
NB		 91 se_cmd_cache = kmem_cache_create("se_cmd_cache",
92 sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
6708bb27
AG		 93 if (!se_cmd_cache) {
94 pr_err("kmem_cache_create for struct se_cmd failed\n");
c66ac9db
NB		 95 goto out;
96 }
97 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
98 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
99 0, NULL);
6708bb27
AG		 100 if (!se_tmr_req_cache) {
101 pr_err("kmem_cache_create() for struct se_tmr_req"
c66ac9db
NB		 102 " failed\n");
103 goto out;
104 }
105 se_sess_cache = kmem_cache_create("se_sess_cache",
106 sizeof(struct se_session), __alignof__(struct se_session),
107 0, NULL);
6708bb27
AG		 108 if (!se_sess_cache) {
109 pr_err("kmem_cache_create() for struct se_session"
c66ac9db
NB		 110 " failed\n");
111 goto out;
112 }
113 se_ua_cache = kmem_cache_create("se_ua_cache",
114 sizeof(struct se_ua), __alignof__(struct se_ua),
115 0, NULL);
6708bb27
AG		 116 if (!se_ua_cache) {
117 pr_err("kmem_cache_create() for struct se_ua failed\n");
c66ac9db
NB		 118 goto out;
119 }
c66ac9db
NB		 120 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
121 sizeof(struct t10_pr_registration),
122 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 123 if (!t10_pr_reg_cache) {
124 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db
NB		 125 " failed\n");
126 goto out;
127 }
128 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
129 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
130 0, NULL);
6708bb27
AG		 131 if (!t10_alua_lu_gp_cache) {
132 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db
NB		 133 " failed\n");
134 goto out;
135 }
136 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
137 sizeof(struct t10_alua_lu_gp_member),
138 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 139 if (!t10_alua_lu_gp_mem_cache) {
140 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db
NB		 141 "cache failed\n");
142 goto out;
143 }
144 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
145 sizeof(struct t10_alua_tg_pt_gp),
146 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 147 if (!t10_alua_tg_pt_gp_cache) {
148 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db
NB		 149 "cache failed\n");
150 goto out;
151 }
152 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
153 "t10_alua_tg_pt_gp_mem_cache",
154 sizeof(struct t10_alua_tg_pt_gp_member),
155 __alignof__(struct t10_alua_tg_pt_gp_member),
156 0, NULL);
6708bb27
AG		 157 if (!t10_alua_tg_pt_gp_mem_cache) {
158 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db
NB		 159 "mem_t failed\n");
160 goto out;
161 }
162
c66ac9db
NB		 163 return 0;
164out:
165 if (se_cmd_cache)
166 kmem_cache_destroy(se_cmd_cache);
167 if (se_tmr_req_cache)
168 kmem_cache_destroy(se_tmr_req_cache);
169 if (se_sess_cache)
170 kmem_cache_destroy(se_sess_cache);
171 if (se_ua_cache)
172 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 173 if (t10_pr_reg_cache)
174 kmem_cache_destroy(t10_pr_reg_cache);
175 if (t10_alua_lu_gp_cache)
176 kmem_cache_destroy(t10_alua_lu_gp_cache);
177 if (t10_alua_lu_gp_mem_cache)
178 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
179 if (t10_alua_tg_pt_gp_cache)
180 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
181 if (t10_alua_tg_pt_gp_mem_cache)
182 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
e3d6f909 183 return -ENOMEM;
c66ac9db
NB		 184}
185
e3d6f909 186void release_se_kmem_caches(void)
c66ac9db 187{
c66ac9db
NB		 188 kmem_cache_destroy(se_cmd_cache);
189 kmem_cache_destroy(se_tmr_req_cache);
190 kmem_cache_destroy(se_sess_cache);
191 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 192 kmem_cache_destroy(t10_pr_reg_cache);
193 kmem_cache_destroy(t10_alua_lu_gp_cache);
194 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
195 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
196 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 197}
198
e3d6f909
AG		 199/* This code ensures unique mib indexes are handed out. */
200static DEFINE_SPINLOCK(scsi_mib_index_lock);
201static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 202
203/*
204 * Allocate a new row index for the entry type specified
205 */
206u32 scsi_get_new_index(scsi_index_t type)
207{
208 u32 new_index;
209
e3d6f909 210 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 211
e3d6f909
AG		 212 spin_lock(&scsi_mib_index_lock);
213 new_index = ++scsi_mib_index[type];
214 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 215
216 return new_index;
217}
218
c66ac9db
NB		 219void transport_init_queue_obj(struct se_queue_obj *qobj)
220{
221 atomic_set(&qobj->queue_cnt, 0);
222 INIT_LIST_HEAD(&qobj->qobj_list);
223 init_waitqueue_head(&qobj->thread_wq);
224 spin_lock_init(&qobj->cmd_queue_lock);
225}
226EXPORT_SYMBOL(transport_init_queue_obj);
227
228static int transport_subsystem_reqmods(void)
229{
230 int ret;
231
232 ret = request_module("target_core_iblock");
233 if (ret != 0)
6708bb27 234 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 235
236 ret = request_module("target_core_file");
237 if (ret != 0)
6708bb27 238 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 239
240 ret = request_module("target_core_pscsi");
241 if (ret != 0)
6708bb27 242 pr_err("Unable to load target_core_pscsi\n");
c66ac9db
NB		 243
244 ret = request_module("target_core_stgt");
245 if (ret != 0)
6708bb27 246 pr_err("Unable to load target_core_stgt\n");
c66ac9db
NB		 247
248 return 0;
249}
250
251int transport_subsystem_check_init(void)
252{
e3d6f909
AG		 253 int ret;
254
255 if (sub_api_initialized)
c66ac9db
NB		 256 return 0;
257 /*
258 * Request the loading of known TCM subsystem plugins..
259 */
e3d6f909
AG		 260 ret = transport_subsystem_reqmods();
261 if (ret < 0)
262 return ret;
c66ac9db 263
e3d6f909 264 sub_api_initialized = 1;
c66ac9db
NB		 265 return 0;
266}
267
268struct se_session *transport_init_session(void)
269{
270 struct se_session *se_sess;
271
272 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 273 if (!se_sess) {
274 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 275 " se_sess_cache\n");
276 return ERR_PTR(-ENOMEM);
277 }
278 INIT_LIST_HEAD(&se_sess->sess_list);
279 INIT_LIST_HEAD(&se_sess->sess_acl_list);
c66ac9db
NB		 280
281 return se_sess;
282}
283EXPORT_SYMBOL(transport_init_session);
284
285/*
286 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
287 */
288void __transport_register_session(
289 struct se_portal_group *se_tpg,
290 struct se_node_acl *se_nacl,
291 struct se_session *se_sess,
292 void *fabric_sess_ptr)
293{
294 unsigned char buf[PR_REG_ISID_LEN];
295
296 se_sess->se_tpg = se_tpg;
297 se_sess->fabric_sess_ptr = fabric_sess_ptr;
298 /*
299 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
300 *
301 * Only set for struct se_session's that will actually be moving I/O.
302 * eg: *NOT* discovery sessions.
303 */
304 if (se_nacl) {
305 /*
306 * If the fabric module supports an ISID based TransportID,
307 * save this value in binary from the fabric I_T Nexus now.
308 */
e3d6f909 309 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 310 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 311 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 312 &buf[0], PR_REG_ISID_LEN);
313 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
314 }
315 spin_lock_irq(&se_nacl->nacl_sess_lock);
316 /*
317 * The se_nacl->nacl_sess pointer will be set to the
318 * last active I_T Nexus for each struct se_node_acl.
319 */
320 se_nacl->nacl_sess = se_sess;
321
322 list_add_tail(&se_sess->sess_acl_list,
323 &se_nacl->acl_sess_list);
324 spin_unlock_irq(&se_nacl->nacl_sess_lock);
325 }
326 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
327
6708bb27 328 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 329 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 330}
331EXPORT_SYMBOL(__transport_register_session);
332
333void transport_register_session(
334 struct se_portal_group *se_tpg,
335 struct se_node_acl *se_nacl,
336 struct se_session *se_sess,
337 void *fabric_sess_ptr)
338{
339 spin_lock_bh(&se_tpg->session_lock);
340 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
341 spin_unlock_bh(&se_tpg->session_lock);
342}
343EXPORT_SYMBOL(transport_register_session);
344
345void transport_deregister_session_configfs(struct se_session *se_sess)
346{
347 struct se_node_acl *se_nacl;
23388864 348 unsigned long flags;
c66ac9db
NB		 349 /*
350 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
351 */
352 se_nacl = se_sess->se_node_acl;
6708bb27 353 if (se_nacl) {
23388864 354 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 355 list_del(&se_sess->sess_acl_list);
356 /*
357 * If the session list is empty, then clear the pointer.
358 * Otherwise, set the struct se_session pointer from the tail
359 * element of the per struct se_node_acl active session list.
360 */
361 if (list_empty(&se_nacl->acl_sess_list))
362 se_nacl->nacl_sess = NULL;
363 else {
364 se_nacl->nacl_sess = container_of(
365 se_nacl->acl_sess_list.prev,
366 struct se_session, sess_acl_list);
367 }
23388864 368 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 369 }
370}
371EXPORT_SYMBOL(transport_deregister_session_configfs);
372
373void transport_free_session(struct se_session *se_sess)
374{
375 kmem_cache_free(se_sess_cache, se_sess);
376}
377EXPORT_SYMBOL(transport_free_session);
378
379void transport_deregister_session(struct se_session *se_sess)
380{
381 struct se_portal_group *se_tpg = se_sess->se_tpg;
382 struct se_node_acl *se_nacl;
e63a8e19 383 unsigned long flags;
c66ac9db 384
6708bb27 385 if (!se_tpg) {
c66ac9db
NB		 386 transport_free_session(se_sess);
387 return;
388 }
c66ac9db 389
e63a8e19 390 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 391 list_del(&se_sess->sess_list);
392 se_sess->se_tpg = NULL;
393 se_sess->fabric_sess_ptr = NULL;
e63a8e19 394 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 395
396 /*
397 * Determine if we need to do extra work for this initiator node's
398 * struct se_node_acl if it had been previously dynamically generated.
399 */
400 se_nacl = se_sess->se_node_acl;
6708bb27 401 if (se_nacl) {
e63a8e19 402 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 403 if (se_nacl->dynamic_node_acl) {
6708bb27
AG		 404 if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
405 se_tpg)) {
c66ac9db
NB		 406 list_del(&se_nacl->acl_list);
407 se_tpg->num_node_acls--;
e63a8e19 408 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 409
410 core_tpg_wait_for_nacl_pr_ref(se_nacl);
c66ac9db 411 core_free_device_list_for_node(se_nacl, se_tpg);
e3d6f909 412 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
c66ac9db 413 se_nacl);
e63a8e19 414 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 415 }
416 }
e63a8e19 417 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 418 }
419
420 transport_free_session(se_sess);
421
6708bb27 422 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 423 se_tpg->se_tpg_tfo->get_fabric_name());
c66ac9db
NB		 424}
425EXPORT_SYMBOL(transport_deregister_session);
426
427/*
a1d8b49a 428 * Called with cmd->t_state_lock held.
c66ac9db
NB		 429 */
430static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
431{
42bf829e 432 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 433 struct se_task *task;
434 unsigned long flags;
435
42bf829e
CH		 436 if (!dev)
437 return;
c66ac9db 438
42bf829e 439 list_for_each_entry(task, &cmd->t_task_list, t_list) {
6c76bf95 440 if (task->task_flags & TF_ACTIVE)
c66ac9db
NB		 441 continue;
442
6708bb27 443 if (!atomic_read(&task->task_state_active))
c66ac9db
NB		 444 continue;
445
446 spin_lock_irqsave(&dev->execute_task_lock, flags);
447 list_del(&task->t_state_list);
6708bb27
AG		 448 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
449 cmd->se_tfo->get_task_tag(cmd), dev, task);
c66ac9db
NB		 450 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
451
452 atomic_set(&task->task_state_active, 0);
a1d8b49a 453 atomic_dec(&cmd->t_task_cdbs_ex_left);
c66ac9db
NB		 454 }
455}
456
457/* transport_cmd_check_stop():
458 *
459 * 'transport_off = 1' determines if t_transport_active should be cleared.
460 * 'transport_off = 2' determines if task_dev_state should be removed.
461 *
462 * A non-zero u8 t_state sets cmd->t_state.
463 * Returns 1 when command is stopped, else 0.
464 */
465static int transport_cmd_check_stop(
466 struct se_cmd *cmd,
467 int transport_off,
468 u8 t_state)
469{
470 unsigned long flags;
471
a1d8b49a 472 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 473 /*
474 * Determine if IOCTL context caller in requesting the stopping of this
475 * command for LUN shutdown purposes.
476 */
a1d8b49a 477 if (atomic_read(&cmd->transport_lun_stop)) {
6708bb27 478 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
c66ac9db 479 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 480 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 481
482 cmd->deferred_t_state = cmd->t_state;
483 cmd->t_state = TRANSPORT_DEFERRED_CMD;
a1d8b49a 484 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 485 if (transport_off == 2)
486 transport_all_task_dev_remove_state(cmd);
a1d8b49a 487 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 488
a1d8b49a 489 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 490 return 1;
491 }
492 /*
493 * Determine if frontend context caller is requesting the stopping of
e3d6f909 494 * this command for frontend exceptions.
c66ac9db 495 */
a1d8b49a 496 if (atomic_read(&cmd->t_transport_stop)) {
6708bb27 497 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
c66ac9db 498 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 499 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 500
501 cmd->deferred_t_state = cmd->t_state;
502 cmd->t_state = TRANSPORT_DEFERRED_CMD;
503 if (transport_off == 2)
504 transport_all_task_dev_remove_state(cmd);
505
506 /*
507 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
508 * to FE.
509 */
510 if (transport_off == 2)
511 cmd->se_lun = NULL;
a1d8b49a 512 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 513
a1d8b49a 514 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 515 return 1;
516 }
517 if (transport_off) {
a1d8b49a 518 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 519 if (transport_off == 2) {
520 transport_all_task_dev_remove_state(cmd);
521 /*
522 * Clear struct se_cmd->se_lun before the transport_off == 2
523 * handoff to fabric module.
524 */
525 cmd->se_lun = NULL;
526 /*
527 * Some fabric modules like tcm_loop can release
25985edc 528 * their internally allocated I/O reference now and
c66ac9db
NB		 529 * struct se_cmd now.
530 */
e3d6f909 531 if (cmd->se_tfo->check_stop_free != NULL) {
c66ac9db 532 spin_unlock_irqrestore(
a1d8b49a 533 &cmd->t_state_lock, flags);
c66ac9db 534
e3d6f909 535 cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 536 return 1;
537 }
538 }
a1d8b49a 539 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 540
541 return 0;
542 } else if (t_state)
543 cmd->t_state = t_state;
a1d8b49a 544 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 545
546 return 0;
547}
548
549static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
550{
551 return transport_cmd_check_stop(cmd, 2, 0);
552}
553
554static void transport_lun_remove_cmd(struct se_cmd *cmd)
555{
e3d6f909 556 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 557 unsigned long flags;
558
559 if (!lun)
560 return;
561
a1d8b49a 562 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 563 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 564 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 565 goto check_lun;
566 }
a1d8b49a 567 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 568 transport_all_task_dev_remove_state(cmd);
a1d8b49a 569 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 570
c66ac9db
NB		 571
572check_lun:
573 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
a1d8b49a 574 if (atomic_read(&cmd->transport_lun_active)) {
5951146d 575 list_del(&cmd->se_lun_node);
a1d8b49a 576 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db 577#if 0
6708bb27 578 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
e3d6f909 579 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
c66ac9db
NB		 580#endif
581 }
582 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
583}
584
585void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
586{
8dc52b54
NB		 587 if (!cmd->se_tmr_req)
588 transport_lun_remove_cmd(cmd);
c66ac9db
NB		 589
590 if (transport_cmd_check_stop_to_fabric(cmd))
591 return;
77039d1e 592 if (remove) {
3df8d40b 593 transport_remove_cmd_from_queue(cmd);
e6a2573f 594 transport_put_cmd(cmd);
77039d1e 595 }
c66ac9db
NB		 596}
597
f7a5cc0b
CH		 598static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
599 bool at_head)
c66ac9db
NB		 600{
601 struct se_device *dev = cmd->se_dev;
e3d6f909 602 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 603 unsigned long flags;
604
c66ac9db 605 if (t_state) {
a1d8b49a 606 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 607 cmd->t_state = t_state;
a1d8b49a
AG		 608 atomic_set(&cmd->t_transport_active, 1);
609 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 610 }
611
612 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
79a7fef2
RD		 613
614 /* If the cmd is already on the list, remove it before we add it */
615 if (!list_empty(&cmd->se_queue_node))
616 list_del(&cmd->se_queue_node);
617 else
618 atomic_inc(&qobj->queue_cnt);
619
f7a5cc0b 620 if (at_head)
07bde79a 621 list_add(&cmd->se_queue_node, &qobj->qobj_list);
f7a5cc0b 622 else
07bde79a 623 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
79a7fef2 624 atomic_set(&cmd->t_transport_queue_active, 1);
c66ac9db
NB		 625 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
626
c66ac9db 627 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 628}
629
5951146d
AG		 630static struct se_cmd *
631transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 632{
5951146d 633 struct se_cmd *cmd;
c66ac9db
NB		 634 unsigned long flags;
635
636 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
637 if (list_empty(&qobj->qobj_list)) {
638 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
639 return NULL;
640 }
5951146d 641 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 642
79a7fef2 643 atomic_set(&cmd->t_transport_queue_active, 0);
c66ac9db 644
79a7fef2 645 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 646 atomic_dec(&qobj->queue_cnt);
647 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
648
5951146d 649 return cmd;
c66ac9db
NB		 650}
651
3df8d40b 652static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
c66ac9db 653{
3df8d40b 654 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
c66ac9db
NB		 655 unsigned long flags;
656
657 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
6708bb27 658 if (!atomic_read(&cmd->t_transport_queue_active)) {
c66ac9db
NB		 659 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
660 return;
661 }
79a7fef2
RD		 662 atomic_set(&cmd->t_transport_queue_active, 0);
663 atomic_dec(&qobj->queue_cnt);
664 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 665 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
666
a1d8b49a 667 if (atomic_read(&cmd->t_transport_queue_active)) {
6708bb27 668 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
e3d6f909 669 cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 670 atomic_read(&cmd->t_transport_queue_active));
c66ac9db
NB		 671 }
672}
673
674/*
675 * Completion function used by TCM subsystem plugins (such as FILEIO)
676 * for queueing up response from struct se_subsystem_api->do_task()
677 */
678void transport_complete_sync_cache(struct se_cmd *cmd, int good)
679{
a1d8b49a 680 struct se_task *task = list_entry(cmd->t_task_list.next,
c66ac9db
NB		 681 struct se_task, t_list);
682
683 if (good) {
684 cmd->scsi_status = SAM_STAT_GOOD;
685 task->task_scsi_status = GOOD;
686 } else {
687 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
688 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
e3d6f909 689 task->task_se_cmd->transport_error_status =
c66ac9db
NB		 690 PYX_TRANSPORT_ILLEGAL_REQUEST;
691 }
692
693 transport_complete_task(task, good);
694}
695EXPORT_SYMBOL(transport_complete_sync_cache);
696
697/* transport_complete_task():
698 *
699 * Called from interrupt and non interrupt context depending
700 * on the transport plugin.
701 */
702void transport_complete_task(struct se_task *task, int success)
703{
e3d6f909 704 struct se_cmd *cmd = task->task_se_cmd;
42bf829e 705 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 706 int t_state;
707 unsigned long flags;
708#if 0
6708bb27 709 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
a1d8b49a 710 cmd->t_task_cdb[0], dev);
c66ac9db 711#endif
e3d6f909 712 if (dev)
c66ac9db 713 atomic_inc(&dev->depth_left);
c66ac9db 714
a1d8b49a 715 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 716 task->task_flags &= ~TF_ACTIVE;
c66ac9db
NB		 717
718 /*
719 * See if any sense data exists, if so set the TASK_SENSE flag.
720 * Also check for any other post completion work that needs to be
721 * done by the plugins.
722 */
723 if (dev && dev->transport->transport_complete) {
724 if (dev->transport->transport_complete(task) != 0) {
725 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
726 task->task_sense = 1;
727 success = 1;
728 }
729 }
730
731 /*
732 * See if we are waiting for outstanding struct se_task
733 * to complete for an exception condition
734 */
6c76bf95 735 if (task->task_flags & TF_REQUEST_STOP) {
c66ac9db 736 /*
a1d8b49a 737 * Decrement cmd->t_se_count if this task had
c66ac9db
NB		 738 * previously thrown its timeout exception handler.
739 */
6c76bf95 740 if (task->task_flags & TF_TIMEOUT) {
a1d8b49a 741 atomic_dec(&cmd->t_se_count);
6c76bf95 742 task->task_flags &= ~TF_TIMEOUT;
c66ac9db 743 }
a1d8b49a 744 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 745
746 complete(&task->task_stop_comp);
747 return;
748 }
749 /*
750 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
751 * left counter to determine when the struct se_cmd is ready to be queued to
752 * the processing thread.
753 */
6c76bf95 754 if (task->task_flags & TF_TIMEOUT) {
6708bb27
AG		 755 if (!atomic_dec_and_test(
756 &cmd->t_task_cdbs_timeout_left)) {
a1d8b49a 757 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 758 flags);
759 return;
760 }
761 t_state = TRANSPORT_COMPLETE_TIMEOUT;
a1d8b49a 762 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 763
f7a5cc0b 764 transport_add_cmd_to_queue(cmd, t_state, false);
c66ac9db
NB		 765 return;
766 }
a1d8b49a 767 atomic_dec(&cmd->t_task_cdbs_timeout_left);
c66ac9db
NB		 768
769 /*
770 * Decrement the outstanding t_task_cdbs_left count. The last
771 * struct se_task from struct se_cmd will complete itself into the
772 * device queue depending upon int success.
773 */
6708bb27 774 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
c66ac9db 775 if (!success)
a1d8b49a 776 cmd->t_tasks_failed = 1;
c66ac9db 777
a1d8b49a 778 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 779 return;
780 }
781
a1d8b49a 782 if (!success || cmd->t_tasks_failed) {
c66ac9db
NB		 783 t_state = TRANSPORT_COMPLETE_FAILURE;
784 if (!task->task_error_status) {
785 task->task_error_status =
786 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
787 cmd->transport_error_status =
788 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
789 }
790 } else {
a1d8b49a 791 atomic_set(&cmd->t_transport_complete, 1);
c66ac9db
NB		 792 t_state = TRANSPORT_COMPLETE_OK;
793 }
a1d8b49a 794 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 795
f7a5cc0b 796 transport_add_cmd_to_queue(cmd, t_state, false);
c66ac9db
NB		 797}
798EXPORT_SYMBOL(transport_complete_task);
799
800/*
801 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
802 * struct se_task list are ready to be added to the active execution list
803 * struct se_device
804
805 * Called with se_dev_t->execute_task_lock called.
806 */
807static inline int transport_add_task_check_sam_attr(
808 struct se_task *task,
809 struct se_task *task_prev,
810 struct se_device *dev)
811{
812 /*
813 * No SAM Task attribute emulation enabled, add to tail of
814 * execution queue
815 */
816 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
817 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
818 return 0;
819 }
820 /*
821 * HEAD_OF_QUEUE attribute for received CDB, which means
822 * the first task that is associated with a struct se_cmd goes to
823 * head of the struct se_device->execute_task_list, and task_prev
824 * after that for each subsequent task
825 */
e66ecd50 826 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 827 list_add(&task->t_execute_list,
828 (task_prev != NULL) ?
829 &task_prev->t_execute_list :
830 &dev->execute_task_list);
831
6708bb27 832 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
c66ac9db 833 " in execution queue\n",
6708bb27 834 task->task_se_cmd->t_task_cdb[0]);
c66ac9db
NB		 835 return 1;
836 }
837 /*
838 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
839 * transitioned from Dermant -> Active state, and are added to the end
840 * of the struct se_device->execute_task_list
841 */
842 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
843 return 0;
844}
845
846/* __transport_add_task_to_execute_queue():
847 *
848 * Called with se_dev_t->execute_task_lock called.
849 */
850static void __transport_add_task_to_execute_queue(
851 struct se_task *task,
852 struct se_task *task_prev,
853 struct se_device *dev)
854{
855 int head_of_queue;
856
857 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
858 atomic_inc(&dev->execute_tasks);
859
860 if (atomic_read(&task->task_state_active))
861 return;
862 /*
863 * Determine if this task needs to go to HEAD_OF_QUEUE for the
864 * state list as well. Running with SAM Task Attribute emulation
865 * will always return head_of_queue == 0 here
866 */
867 if (head_of_queue)
868 list_add(&task->t_state_list, (task_prev) ?
869 &task_prev->t_state_list :
870 &dev->state_task_list);
871 else
872 list_add_tail(&task->t_state_list, &dev->state_task_list);
873
874 atomic_set(&task->task_state_active, 1);
875
6708bb27 876 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
e3d6f909 877 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
c66ac9db
NB		 878 task, dev);
879}
880
881static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
882{
42bf829e 883 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 884 struct se_task *task;
885 unsigned long flags;
886
a1d8b49a
AG		 887 spin_lock_irqsave(&cmd->t_state_lock, flags);
888 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 889 if (atomic_read(&task->task_state_active))
890 continue;
891
892 spin_lock(&dev->execute_task_lock);
893 list_add_tail(&task->t_state_list, &dev->state_task_list);
894 atomic_set(&task->task_state_active, 1);
895
6708bb27
AG		 896 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
897 task->task_se_cmd->se_tfo->get_task_tag(
c66ac9db
NB		 898 task->task_se_cmd), task, dev);
899
900 spin_unlock(&dev->execute_task_lock);
901 }
a1d8b49a 902 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 903}
904
905static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
906{
5951146d 907 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 908 struct se_task *task, *task_prev = NULL;
909 unsigned long flags;
910
911 spin_lock_irqsave(&dev->execute_task_lock, flags);
a1d8b49a 912 list_for_each_entry(task, &cmd->t_task_list, t_list) {
04629b7b 913 if (!list_empty(&task->t_execute_list))
c66ac9db
NB		 914 continue;
915 /*
916 * __transport_add_task_to_execute_queue() handles the
917 * SAM Task Attribute emulation if enabled
918 */
919 __transport_add_task_to_execute_queue(task, task_prev, dev);
c66ac9db
NB		 920 task_prev = task;
921 }
922 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 923}
924
04629b7b
CH		 925void __transport_remove_task_from_execute_queue(struct se_task *task,
926 struct se_device *dev)
927{
928 list_del_init(&task->t_execute_list);
929 atomic_dec(&dev->execute_tasks);
930}
931
52208ae3 932void transport_remove_task_from_execute_queue(
c66ac9db
NB		 933 struct se_task *task,
934 struct se_device *dev)
935{
936 unsigned long flags;
937
04629b7b 938 if (WARN_ON(list_empty(&task->t_execute_list)))
af57c3ac 939 return;
af57c3ac 940
c66ac9db 941 spin_lock_irqsave(&dev->execute_task_lock, flags);
04629b7b 942 __transport_remove_task_from_execute_queue(task, dev);
c66ac9db
NB		 943 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
944}
945
07bde79a
NB		 946/*
947 * Handle QUEUE_FULL / -EAGAIN status
948 */
949
950static void target_qf_do_work(struct work_struct *work)
951{
952 struct se_device *dev = container_of(work, struct se_device,
953 qf_work_queue);
bcac364a 954 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 955 struct se_cmd *cmd, *cmd_tmp;
956
957 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 958 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
959 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 960
bcac364a 961 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 962 list_del(&cmd->se_qf_node);
963 atomic_dec(&dev->dev_qf_count);
964 smp_mb__after_atomic_dec();
07bde79a 965
6708bb27 966 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 967 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 968 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 969 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
970 : "UNKNOWN");
f7a5cc0b
CH		 971
972 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
07bde79a 973 }
07bde79a
NB		 974}
975
c66ac9db
NB		 976unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
977{
978 switch (cmd->data_direction) {
979 case DMA_NONE:
980 return "NONE";
981 case DMA_FROM_DEVICE:
982 return "READ";
983 case DMA_TO_DEVICE:
984 return "WRITE";
985 case DMA_BIDIRECTIONAL:
986 return "BIDI";
987 default:
988 break;
989 }
990
991 return "UNKNOWN";
992}
993
994void transport_dump_dev_state(
995 struct se_device *dev,
996 char *b,
997 int *bl)
998{
999 *bl += sprintf(b + *bl, "Status: ");
1000 switch (dev->dev_status) {
1001 case TRANSPORT_DEVICE_ACTIVATED:
1002 *bl += sprintf(b + *bl, "ACTIVATED");
1003 break;
1004 case TRANSPORT_DEVICE_DEACTIVATED:
1005 *bl += sprintf(b + *bl, "DEACTIVATED");
1006 break;
1007 case TRANSPORT_DEVICE_SHUTDOWN:
1008 *bl += sprintf(b + *bl, "SHUTDOWN");
1009 break;
1010 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
1011 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
1012 *bl += sprintf(b + *bl, "OFFLINE");
1013 break;
1014 default:
1015 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
1016 break;
1017 }
1018
1019 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
1020 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
1021 dev->queue_depth);
1022 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
e3d6f909 1023 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db
NB		 1024 *bl += sprintf(b + *bl, " ");
1025}
1026
c66ac9db
NB		 1027void transport_dump_vpd_proto_id(
1028 struct t10_vpd *vpd,
1029 unsigned char *p_buf,
1030 int p_buf_len)
1031{
1032 unsigned char buf[VPD_TMP_BUF_SIZE];
1033 int len;
1034
1035 memset(buf, 0, VPD_TMP_BUF_SIZE);
1036 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1037
1038 switch (vpd->protocol_identifier) {
1039 case 0x00:
1040 sprintf(buf+len, "Fibre Channel\n");
1041 break;
1042 case 0x10:
1043 sprintf(buf+len, "Parallel SCSI\n");
1044 break;
1045 case 0x20:
1046 sprintf(buf+len, "SSA\n");
1047 break;
1048 case 0x30:
1049 sprintf(buf+len, "IEEE 1394\n");
1050 break;
1051 case 0x40:
1052 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1053 " Protocol\n");
1054 break;
1055 case 0x50:
1056 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1057 break;
1058 case 0x60:
1059 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1060 break;
1061 case 0x70:
1062 sprintf(buf+len, "Automation/Drive Interface Transport"
1063 " Protocol\n");
1064 break;
1065 case 0x80:
1066 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1067 break;
1068 default:
1069 sprintf(buf+len, "Unknown 0x%02x\n",
1070 vpd->protocol_identifier);
1071 break;
1072 }
1073
1074 if (p_buf)
1075 strncpy(p_buf, buf, p_buf_len);
1076 else
6708bb27 1077 pr_debug("%s", buf);
c66ac9db
NB		 1078}
1079
1080void
1081transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1082{
1083 /*
1084 * Check if the Protocol Identifier Valid (PIV) bit is set..
1085 *
1086 * from spc3r23.pdf section 7.5.1
1087 */
1088 if (page_83[1] & 0x80) {
1089 vpd->protocol_identifier = (page_83[0] & 0xf0);
1090 vpd->protocol_identifier_set = 1;
1091 transport_dump_vpd_proto_id(vpd, NULL, 0);
1092 }
1093}
1094EXPORT_SYMBOL(transport_set_vpd_proto_id);
1095
1096int transport_dump_vpd_assoc(
1097 struct t10_vpd *vpd,
1098 unsigned char *p_buf,
1099 int p_buf_len)
1100{
1101 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1102 int ret = 0;
1103 int len;
c66ac9db
NB		 1104
1105 memset(buf, 0, VPD_TMP_BUF_SIZE);
1106 len = sprintf(buf, "T10 VPD Identifier Association: ");
1107
1108 switch (vpd->association) {
1109 case 0x00:
1110 sprintf(buf+len, "addressed logical unit\n");
1111 break;
1112 case 0x10:
1113 sprintf(buf+len, "target port\n");
1114 break;
1115 case 0x20:
1116 sprintf(buf+len, "SCSI target device\n");
1117 break;
1118 default:
1119 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 1120 ret = -EINVAL;
c66ac9db
NB		 1121 break;
1122 }
1123
1124 if (p_buf)
1125 strncpy(p_buf, buf, p_buf_len);
1126 else
6708bb27 1127 pr_debug("%s", buf);
c66ac9db
NB		 1128
1129 return ret;
1130}
1131
1132int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1133{
1134 /*
1135 * The VPD identification association..
1136 *
1137 * from spc3r23.pdf Section 7.6.3.1 Table 297
1138 */
1139 vpd->association = (page_83[1] & 0x30);
1140 return transport_dump_vpd_assoc(vpd, NULL, 0);
1141}
1142EXPORT_SYMBOL(transport_set_vpd_assoc);
1143
1144int transport_dump_vpd_ident_type(
1145 struct t10_vpd *vpd,
1146 unsigned char *p_buf,
1147 int p_buf_len)
1148{
1149 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1150 int ret = 0;
1151 int len;
c66ac9db
NB		 1152
1153 memset(buf, 0, VPD_TMP_BUF_SIZE);
1154 len = sprintf(buf, "T10 VPD Identifier Type: ");
1155
1156 switch (vpd->device_identifier_type) {
1157 case 0x00:
1158 sprintf(buf+len, "Vendor specific\n");
1159 break;
1160 case 0x01:
1161 sprintf(buf+len, "T10 Vendor ID based\n");
1162 break;
1163 case 0x02:
1164 sprintf(buf+len, "EUI-64 based\n");
1165 break;
1166 case 0x03:
1167 sprintf(buf+len, "NAA\n");
1168 break;
1169 case 0x04:
1170 sprintf(buf+len, "Relative target port identifier\n");
1171 break;
1172 case 0x08:
1173 sprintf(buf+len, "SCSI name string\n");
1174 break;
1175 default:
1176 sprintf(buf+len, "Unsupported: 0x%02x\n",
1177 vpd->device_identifier_type);
e3d6f909 1178 ret = -EINVAL;
c66ac9db
NB		 1179 break;
1180 }
1181
e3d6f909
AG		 1182 if (p_buf) {
1183 if (p_buf_len < strlen(buf)+1)
1184 return -EINVAL;
c66ac9db 1185 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1186 } else {
6708bb27 1187 pr_debug("%s", buf);
e3d6f909 1188 }
c66ac9db
NB		 1189
1190 return ret;
1191}
1192
1193int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1194{
1195 /*
1196 * The VPD identifier type..
1197 *
1198 * from spc3r23.pdf Section 7.6.3.1 Table 298
1199 */
1200 vpd->device_identifier_type = (page_83[1] & 0x0f);
1201 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1202}
1203EXPORT_SYMBOL(transport_set_vpd_ident_type);
1204
1205int transport_dump_vpd_ident(
1206 struct t10_vpd *vpd,
1207 unsigned char *p_buf,
1208 int p_buf_len)
1209{
1210 unsigned char buf[VPD_TMP_BUF_SIZE];
1211 int ret = 0;
1212
1213 memset(buf, 0, VPD_TMP_BUF_SIZE);
1214
1215 switch (vpd->device_identifier_code_set) {
1216 case 0x01: /* Binary */
1217 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1218 &vpd->device_identifier[0]);
1219 break;
1220 case 0x02: /* ASCII */
1221 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1222 &vpd->device_identifier[0]);
1223 break;
1224 case 0x03: /* UTF-8 */
1225 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1226 &vpd->device_identifier[0]);
1227 break;
1228 default:
1229 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1230 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1231 ret = -EINVAL;
c66ac9db
NB		 1232 break;
1233 }
1234
1235 if (p_buf)
1236 strncpy(p_buf, buf, p_buf_len);
1237 else
6708bb27 1238 pr_debug("%s", buf);
c66ac9db
NB		 1239
1240 return ret;
1241}
1242
1243int
1244transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1245{
1246 static const char hex_str[] = "0123456789abcdef";
1247 int j = 0, i = 4; /* offset to start of the identifer */
1248
1249 /*
1250 * The VPD Code Set (encoding)
1251 *
1252 * from spc3r23.pdf Section 7.6.3.1 Table 296
1253 */
1254 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1255 switch (vpd->device_identifier_code_set) {
1256 case 0x01: /* Binary */
1257 vpd->device_identifier[j++] =
1258 hex_str[vpd->device_identifier_type];
1259 while (i < (4 + page_83[3])) {
1260 vpd->device_identifier[j++] =
1261 hex_str[(page_83[i] & 0xf0) >> 4];
1262 vpd->device_identifier[j++] =
1263 hex_str[page_83[i] & 0x0f];
1264 i++;
1265 }
1266 break;
1267 case 0x02: /* ASCII */
1268 case 0x03: /* UTF-8 */
1269 while (i < (4 + page_83[3]))
1270 vpd->device_identifier[j++] = page_83[i++];
1271 break;
1272 default:
1273 break;
1274 }
1275
1276 return transport_dump_vpd_ident(vpd, NULL, 0);
1277}
1278EXPORT_SYMBOL(transport_set_vpd_ident);
1279
1280static void core_setup_task_attr_emulation(struct se_device *dev)
1281{
1282 /*
1283 * If this device is from Target_Core_Mod/pSCSI, disable the
1284 * SAM Task Attribute emulation.
1285 *
1286 * This is currently not available in upsream Linux/SCSI Target
1287 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1288 */
e3d6f909 1289 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1290 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1291 return;
1292 }
1293
1294 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1295 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1296 " device\n", dev->transport->name,
1297 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1298}
1299
1300static void scsi_dump_inquiry(struct se_device *dev)
1301{
e3d6f909 1302 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
c66ac9db
NB		 1303 int i, device_type;
1304 /*
1305 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1306 */
6708bb27 1307 pr_debug(" Vendor: ");
c66ac9db
NB		 1308 for (i = 0; i < 8; i++)
1309 if (wwn->vendor[i] >= 0x20)
6708bb27 1310 pr_debug("%c", wwn->vendor[i]);
c66ac9db 1311 else
6708bb27 1312 pr_debug(" ");
c66ac9db 1313
6708bb27 1314 pr_debug(" Model: ");
c66ac9db
NB		 1315 for (i = 0; i < 16; i++)
1316 if (wwn->model[i] >= 0x20)
6708bb27 1317 pr_debug("%c", wwn->model[i]);
c66ac9db 1318 else
6708bb27 1319 pr_debug(" ");
c66ac9db 1320
6708bb27 1321 pr_debug(" Revision: ");
c66ac9db
NB		 1322 for (i = 0; i < 4; i++)
1323 if (wwn->revision[i] >= 0x20)
6708bb27 1324 pr_debug("%c", wwn->revision[i]);
c66ac9db 1325 else
6708bb27 1326 pr_debug(" ");
c66ac9db 1327
6708bb27 1328 pr_debug("\n");
c66ac9db 1329
e3d6f909 1330 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1331 pr_debug(" Type: %s ", scsi_device_type(device_type));
1332 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1333 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1334}
1335
1336struct se_device *transport_add_device_to_core_hba(
1337 struct se_hba *hba,
1338 struct se_subsystem_api *transport,
1339 struct se_subsystem_dev *se_dev,
1340 u32 device_flags,
1341 void *transport_dev,
1342 struct se_dev_limits *dev_limits,
1343 const char *inquiry_prod,
1344 const char *inquiry_rev)
1345{
12a18bdc 1346 int force_pt;
c66ac9db
NB		 1347 struct se_device *dev;
1348
1349 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1350 if (!dev) {
1351 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1352 return NULL;
1353 }
c66ac9db 1354
e3d6f909 1355 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1356 dev->dev_flags = device_flags;
1357 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1358 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1359 dev->se_hba = hba;
1360 dev->se_sub_dev = se_dev;
1361 dev->transport = transport;
1362 atomic_set(&dev->active_cmds, 0);
1363 INIT_LIST_HEAD(&dev->dev_list);
1364 INIT_LIST_HEAD(&dev->dev_sep_list);
1365 INIT_LIST_HEAD(&dev->dev_tmr_list);
1366 INIT_LIST_HEAD(&dev->execute_task_list);
1367 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1368 INIT_LIST_HEAD(&dev->ordered_cmd_list);
1369 INIT_LIST_HEAD(&dev->state_task_list);
07bde79a 1370 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1371 spin_lock_init(&dev->execute_task_lock);
1372 spin_lock_init(&dev->delayed_cmd_lock);
1373 spin_lock_init(&dev->ordered_cmd_lock);
1374 spin_lock_init(&dev->state_task_lock);
1375 spin_lock_init(&dev->dev_alua_lock);
1376 spin_lock_init(&dev->dev_reservation_lock);
1377 spin_lock_init(&dev->dev_status_lock);
1378 spin_lock_init(&dev->dev_status_thr_lock);
1379 spin_lock_init(&dev->se_port_lock);
1380 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1381 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1382
1383 dev->queue_depth = dev_limits->queue_depth;
1384 atomic_set(&dev->depth_left, dev->queue_depth);
1385 atomic_set(&dev->dev_ordered_id, 0);
1386
1387 se_dev_set_default_attribs(dev, dev_limits);
1388
1389 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1390 dev->creation_time = get_jiffies_64();
1391 spin_lock_init(&dev->stats_lock);
1392
1393 spin_lock(&hba->device_lock);
1394 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1395 hba->dev_count++;
1396 spin_unlock(&hba->device_lock);
1397 /*
1398 * Setup the SAM Task Attribute emulation for struct se_device
1399 */
1400 core_setup_task_attr_emulation(dev);
1401 /*
1402 * Force PR and ALUA passthrough emulation with internal object use.
1403 */
1404 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1405 /*
1406 * Setup the Reservations infrastructure for struct se_device
1407 */
1408 core_setup_reservations(dev, force_pt);
1409 /*
1410 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1411 */
1412 if (core_setup_alua(dev, force_pt) < 0)
1413 goto out;
1414
1415 /*
1416 * Startup the struct se_device processing thread
1417 */
1418 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1419 "LIO_%s", dev->transport->name);
c66ac9db 1420 if (IS_ERR(dev->process_thread)) {
6708bb27 1421 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1422 dev->transport->name);
c66ac9db
NB		 1423 goto out;
1424 }
07bde79a
NB		 1425 /*
1426 * Setup work_queue for QUEUE_FULL
1427 */
1428 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1429 /*
1430 * Preload the initial INQUIRY const values if we are doing
1431 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1432 * passthrough because this is being provided by the backend LLD.
1433 * This is required so that transport_get_inquiry() copies these
1434 * originals once back into DEV_T10_WWN(dev) for the virtual device
1435 * setup.
1436 */
e3d6f909 1437 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1438 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1439 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1440 " INQUIRY consts\n");
1441 goto out;
1442 }
1443
e3d6f909
AG		 1444 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1445 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1446 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1447 }
1448 scsi_dump_inquiry(dev);
1449
12a18bdc 1450 return dev;
c66ac9db 1451out:
c66ac9db
NB		 1452 kthread_stop(dev->process_thread);
1453
1454 spin_lock(&hba->device_lock);
1455 list_del(&dev->dev_list);
1456 hba->dev_count--;
1457 spin_unlock(&hba->device_lock);
1458
1459 se_release_vpd_for_dev(dev);
1460
c66ac9db
NB		 1461 kfree(dev);
1462
1463 return NULL;
1464}
1465EXPORT_SYMBOL(transport_add_device_to_core_hba);
1466
1467/* transport_generic_prepare_cdb():
1468 *
1469 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1470 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1471 * The point of this is since we are mapping iSCSI LUNs to
1472 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1473 * devices and HBAs for a loop.
1474 */
1475static inline void transport_generic_prepare_cdb(
1476 unsigned char *cdb)
1477{
1478 switch (cdb[0]) {
1479 case READ_10: /* SBC - RDProtect */
1480 case READ_12: /* SBC - RDProtect */
1481 case READ_16: /* SBC - RDProtect */
1482 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1483 case VERIFY: /* SBC - VRProtect */
1484 case VERIFY_16: /* SBC - VRProtect */
1485 case WRITE_VERIFY: /* SBC - VRProtect */
1486 case WRITE_VERIFY_12: /* SBC - VRProtect */
1487 break;
1488 default:
1489 cdb[1] &= 0x1f; /* clear logical unit number */
1490 break;
1491 }
1492}
1493
1494static struct se_task *
1495transport_generic_get_task(struct se_cmd *cmd,
1496 enum dma_data_direction data_direction)
1497{
1498 struct se_task *task;
5951146d 1499 struct se_device *dev = cmd->se_dev;
c66ac9db 1500
6708bb27 1501 task = dev->transport->alloc_task(cmd->t_task_cdb);
c66ac9db 1502 if (!task) {
6708bb27 1503 pr_err("Unable to allocate struct se_task\n");
c66ac9db
NB		 1504 return NULL;
1505 }
1506
1507 INIT_LIST_HEAD(&task->t_list);
1508 INIT_LIST_HEAD(&task->t_execute_list);
1509 INIT_LIST_HEAD(&task->t_state_list);
1510 init_completion(&task->task_stop_comp);
c66ac9db 1511 task->task_se_cmd = cmd;
c66ac9db
NB		 1512 task->task_data_direction = data_direction;
1513
c66ac9db
NB		 1514 return task;
1515}
1516
1517static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1518
c66ac9db
NB		 1519/*
1520 * Used by fabric modules containing a local struct se_cmd within their
1521 * fabric dependent per I/O descriptor.
1522 */
1523void transport_init_se_cmd(
1524 struct se_cmd *cmd,
1525 struct target_core_fabric_ops *tfo,
1526 struct se_session *se_sess,
1527 u32 data_length,
1528 int data_direction,
1529 int task_attr,
1530 unsigned char *sense_buffer)
1531{
5951146d
AG		 1532 INIT_LIST_HEAD(&cmd->se_lun_node);
1533 INIT_LIST_HEAD(&cmd->se_delayed_node);
1534 INIT_LIST_HEAD(&cmd->se_ordered_node);
07bde79a 1535 INIT_LIST_HEAD(&cmd->se_qf_node);
79a7fef2 1536 INIT_LIST_HEAD(&cmd->se_queue_node);
c66ac9db 1537
a1d8b49a
AG		 1538 INIT_LIST_HEAD(&cmd->t_task_list);
1539 init_completion(&cmd->transport_lun_fe_stop_comp);
1540 init_completion(&cmd->transport_lun_stop_comp);
1541 init_completion(&cmd->t_transport_stop_comp);
1542 spin_lock_init(&cmd->t_state_lock);
1543 atomic_set(&cmd->transport_dev_active, 1);
c66ac9db
NB		 1544
1545 cmd->se_tfo = tfo;
1546 cmd->se_sess = se_sess;
1547 cmd->data_length = data_length;
1548 cmd->data_direction = data_direction;
1549 cmd->sam_task_attr = task_attr;
1550 cmd->sense_buffer = sense_buffer;
1551}
1552EXPORT_SYMBOL(transport_init_se_cmd);
1553
1554static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1555{
1556 /*
1557 * Check if SAM Task Attribute emulation is enabled for this
1558 * struct se_device storage object
1559 */
5951146d 1560 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1561 return 0;
1562
e66ecd50 1563 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1564 pr_debug("SAM Task Attribute ACA"
c66ac9db 1565 " emulation is not supported\n");
e3d6f909 1566 return -EINVAL;
c66ac9db
NB		 1567 }
1568 /*
1569 * Used to determine when ORDERED commands should go from
1570 * Dormant to Active status.
1571 */
5951146d 1572 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1573 smp_mb__after_atomic_inc();
6708bb27 1574 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1575 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1576 cmd->se_dev->transport->name);
c66ac9db
NB		 1577 return 0;
1578}
1579
c66ac9db
NB		 1580/* transport_generic_allocate_tasks():
1581 *
1582 * Called from fabric RX Thread.
1583 */
1584int transport_generic_allocate_tasks(
1585 struct se_cmd *cmd,
1586 unsigned char *cdb)
1587{
1588 int ret;
1589
1590 transport_generic_prepare_cdb(cdb);
c66ac9db
NB		 1591 /*
1592 * Ensure that the received CDB is less than the max (252 + 8) bytes
1593 * for VARIABLE_LENGTH_CMD
1594 */
1595 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1596 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1597 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1598 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
e3d6f909 1599 return -EINVAL;
c66ac9db
NB		 1600 }
1601 /*
1602 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1603 * allocate the additional extended CDB buffer now.. Otherwise
1604 * setup the pointer from __t_task_cdb to t_task_cdb.
1605 */
a1d8b49a
AG		 1606 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1607 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1608 GFP_KERNEL);
6708bb27
AG		 1609 if (!cmd->t_task_cdb) {
1610 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1611 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1612 scsi_command_size(cdb),
a1d8b49a 1613 (unsigned long)sizeof(cmd->__t_task_cdb));
e3d6f909 1614 return -ENOMEM;
c66ac9db
NB		 1615 }
1616 } else
a1d8b49a 1617 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1618 /*
a1d8b49a 1619 * Copy the original CDB into cmd->
c66ac9db 1620 */
a1d8b49a 1621 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1622 /*
1623 * Setup the received CDB based on SCSI defined opcodes and
1624 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1625 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1626 * pointer is expected to be setup before we reach this point.
1627 */
1628 ret = transport_generic_cmd_sequencer(cmd, cdb);
1629 if (ret < 0)
1630 return ret;
1631 /*
1632 * Check for SAM Task Attribute Emulation
1633 */
1634 if (transport_check_alloc_task_attr(cmd) < 0) {
1635 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1636 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1637 return -EINVAL;
c66ac9db
NB		 1638 }
1639 spin_lock(&cmd->se_lun->lun_sep_lock);
1640 if (cmd->se_lun->lun_sep)
1641 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1642 spin_unlock(&cmd->se_lun->lun_sep_lock);
1643 return 0;
1644}
1645EXPORT_SYMBOL(transport_generic_allocate_tasks);
1646
dd8ae59d
NB		 1647static void transport_generic_request_failure(struct se_cmd *,
1648 struct se_device *, int, int);
695434e1
NB		 1649/*
1650 * Used by fabric module frontends to queue tasks directly.
1651 * Many only be used from process context only
1652 */
1653int transport_handle_cdb_direct(
1654 struct se_cmd *cmd)
1655{
dd8ae59d
NB		 1656 int ret;
1657
695434e1
NB		 1658 if (!cmd->se_lun) {
1659 dump_stack();
6708bb27 1660 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1661 return -EINVAL;
1662 }
1663 if (in_interrupt()) {
1664 dump_stack();
6708bb27 1665 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1666 " from interrupt context\n");
1667 return -EINVAL;
1668 }
dd8ae59d
NB		 1669 /*
1670 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1671 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1672 * in existing usage to ensure that outstanding descriptors are handled
d14921d6 1673 * correctly during shutdown via transport_wait_for_tasks()
dd8ae59d
NB		 1674 *
1675 * Also, we don't take cmd->t_state_lock here as we only expect
1676 * this to be called for initial descriptor submission.
1677 */
1678 cmd->t_state = TRANSPORT_NEW_CMD;
1679 atomic_set(&cmd->t_transport_active, 1);
1680 /*
1681 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1682 * so follow TRANSPORT_NEW_CMD processing thread context usage
1683 * and call transport_generic_request_failure() if necessary..
1684 */
1685 ret = transport_generic_new_cmd(cmd);
1686 if (ret == -EAGAIN)
1687 return 0;
1688 else if (ret < 0) {
1689 cmd->transport_error_status = ret;
1690 transport_generic_request_failure(cmd, NULL, 0,
1691 (cmd->data_direction != DMA_TO_DEVICE));
1692 }
1693 return 0;
695434e1
NB		 1694}
1695EXPORT_SYMBOL(transport_handle_cdb_direct);
1696
c66ac9db
NB		 1697/*
1698 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1699 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1700 * complete setup in TCM process context w/ TFO->new_cmd_map().
1701 */
1702int transport_generic_handle_cdb_map(
1703 struct se_cmd *cmd)
1704{
e3d6f909 1705 if (!cmd->se_lun) {
c66ac9db 1706 dump_stack();
6708bb27 1707 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1708 return -EINVAL;
c66ac9db
NB		 1709 }
1710
f7a5cc0b 1711 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
c66ac9db
NB		 1712 return 0;
1713}
1714EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1715
1716/* transport_generic_handle_data():
1717 *
1718 *
1719 */
1720int transport_generic_handle_data(
1721 struct se_cmd *cmd)
1722{
1723 /*
1724 * For the software fabric case, then we assume the nexus is being
1725 * failed/shutdown when signals are pending from the kthread context
1726 * caller, so we return a failure. For the HW target mode case running
1727 * in interrupt code, the signal_pending() check is skipped.
1728 */
1729 if (!in_interrupt() && signal_pending(current))
e3d6f909 1730 return -EPERM;
c66ac9db
NB		 1731 /*
1732 * If the received CDB has aleady been ABORTED by the generic
1733 * target engine, we now call transport_check_aborted_status()
1734 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1735 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1736 * sequences at this point.
1737 */
1738 if (transport_check_aborted_status(cmd, 1) != 0)
1739 return 0;
1740
f7a5cc0b 1741 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
c66ac9db
NB		 1742 return 0;
1743}
1744EXPORT_SYMBOL(transport_generic_handle_data);
1745
1746/* transport_generic_handle_tmr():
1747 *
1748 *
1749 */
1750int transport_generic_handle_tmr(
1751 struct se_cmd *cmd)
1752{
f7a5cc0b 1753 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
c66ac9db
NB		 1754 return 0;
1755}
1756EXPORT_SYMBOL(transport_generic_handle_tmr);
1757
f4366772
NB		 1758void transport_generic_free_cmd_intr(
1759 struct se_cmd *cmd)
1760{
f7a5cc0b 1761 transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR, false);
f4366772
NB		 1762}
1763EXPORT_SYMBOL(transport_generic_free_cmd_intr);
1764
cdbb70bb
CH		 1765/*
1766 * If the task is active, request it to be stopped and sleep until it
1767 * has completed.
1768 */
1769bool target_stop_task(struct se_task *task, unsigned long *flags)
1770{
1771 struct se_cmd *cmd = task->task_se_cmd;
1772 bool was_active = false;
1773
1774 if (task->task_flags & TF_ACTIVE) {
1775 task->task_flags |= TF_REQUEST_STOP;
1776 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1777
1778 pr_debug("Task %p waiting to complete\n", task);
1779 wait_for_completion(&task->task_stop_comp);
1780 pr_debug("Task %p stopped successfully\n", task);
1781
1782 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1783 atomic_dec(&cmd->t_task_cdbs_left);
1784 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1785 was_active = true;
1786 }
1787
1788 __transport_stop_task_timer(task, flags);
1789 return was_active;
1790}
1791
c66ac9db
NB		 1792static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1793{
1794 struct se_task *task, *task_tmp;
1795 unsigned long flags;
1796 int ret = 0;
1797
6708bb27 1798 pr_debug("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 1799 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 1800
1801 /*
1802 * No tasks remain in the execution queue
1803 */
a1d8b49a 1804 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1805 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 1806 &cmd->t_task_list, t_list) {
04629b7b 1807 pr_debug("Processing task %p\n", task);
c66ac9db
NB		 1808 /*
1809 * If the struct se_task has not been sent and is not active,
1810 * remove the struct se_task from the execution queue.
1811 */
6c76bf95 1812 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
a1d8b49a 1813 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1814 flags);
1815 transport_remove_task_from_execute_queue(task,
42bf829e 1816 cmd->se_dev);
c66ac9db 1817
04629b7b 1818 pr_debug("Task %p removed from execute queue\n", task);
a1d8b49a 1819 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 1820 continue;
1821 }
1822
cdbb70bb 1823 if (!target_stop_task(task, &flags)) {
04629b7b 1824 pr_debug("Task %p - did nothing\n", task);
c66ac9db
NB		 1825 ret++;
1826 }
c66ac9db 1827 }
a1d8b49a 1828 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1829
1830 return ret;
1831}
1832
c66ac9db
NB		 1833/*
1834 * Handle SAM-esque emulation for generic transport request failures.
1835 */
1836static void transport_generic_request_failure(
1837 struct se_cmd *cmd,
1838 struct se_device *dev,
1839 int complete,
1840 int sc)
1841{
07bde79a
NB		 1842 int ret = 0;
1843
6708bb27 1844 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1845 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1846 cmd->t_task_cdb[0]);
6708bb27 1847 pr_debug("-----[ i_state: %d t_state/def_t_state:"
c66ac9db 1848 " %d/%d transport_error_status: %d\n",
e3d6f909 1849 cmd->se_tfo->get_cmd_state(cmd),
c66ac9db
NB		 1850 cmd->t_state, cmd->deferred_t_state,
1851 cmd->transport_error_status);
6708bb27 1852 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
c66ac9db
NB		 1853 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1854 " t_transport_active: %d t_transport_stop: %d"
6708bb27 1855 " t_transport_sent: %d\n", cmd->t_task_list_num,
a1d8b49a
AG		 1856 atomic_read(&cmd->t_task_cdbs_left),
1857 atomic_read(&cmd->t_task_cdbs_sent),
1858 atomic_read(&cmd->t_task_cdbs_ex_left),
1859 atomic_read(&cmd->t_transport_active),
1860 atomic_read(&cmd->t_transport_stop),
1861 atomic_read(&cmd->t_transport_sent));
c66ac9db
NB		 1862
1863 transport_stop_all_task_timers(cmd);
1864
1865 if (dev)
e3d6f909 1866 atomic_inc(&dev->depth_left);
c66ac9db
NB		 1867 /*
1868 * For SAM Task Attribute emulation for failed struct se_cmd
1869 */
1870 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1871 transport_complete_task_attr(cmd);
1872
1873 if (complete) {
1874 transport_direct_request_timeout(cmd);
1875 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
1876 }
1877
1878 switch (cmd->transport_error_status) {
1879 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
1880 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1881 break;
1882 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
1883 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
1884 break;
1885 case PYX_TRANSPORT_INVALID_CDB_FIELD:
1886 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1887 break;
1888 case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
1889 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1890 break;
1891 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
1892 if (!sc)
1893 transport_new_cmd_failure(cmd);
1894 /*
1895 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1896 * we force this session to fall back to session
1897 * recovery.
1898 */
e3d6f909
AG		 1899 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
1900 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
c66ac9db
NB		 1901
1902 goto check_stop;
1903 case PYX_TRANSPORT_LU_COMM_FAILURE:
1904 case PYX_TRANSPORT_ILLEGAL_REQUEST:
1905 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1906 break;
1907 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
1908 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
1909 break;
1910 case PYX_TRANSPORT_WRITE_PROTECTED:
1911 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
1912 break;
1913 case PYX_TRANSPORT_RESERVATION_CONFLICT:
1914 /*
1915 * No SENSE Data payload for this case, set SCSI Status
1916 * and queue the response to $FABRIC_MOD.
1917 *
1918 * Uses linux/include/scsi/scsi.h SAM status codes defs
1919 */
1920 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1921 /*
1922 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1923 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1924 * CONFLICT STATUS.
1925 *
1926 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1927 */
e3d6f909
AG		 1928 if (cmd->se_sess &&
1929 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1930 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1931 cmd->orig_fe_lun, 0x2C,
1932 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1933
07bde79a
NB		 1934 ret = cmd->se_tfo->queue_status(cmd);
1935 if (ret == -EAGAIN)
1936 goto queue_full;
c66ac9db
NB		 1937 goto check_stop;
1938 case PYX_TRANSPORT_USE_SENSE_REASON:
1939 /*
1940 * struct se_cmd->scsi_sense_reason already set
1941 */
1942 break;
1943 default:
6708bb27 1944 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
a1d8b49a 1945 cmd->t_task_cdb[0],
c66ac9db
NB		 1946 cmd->transport_error_status);
1947 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1948 break;
1949 }
16ab8e60
NB		 1950 /*
1951 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1952 * make the call to transport_send_check_condition_and_sense()
1953 * directly. Otherwise expect the fabric to make the call to
1954 * transport_send_check_condition_and_sense() after handling
1955 * possible unsoliticied write data payloads.
1956 */
1957 if (!sc && !cmd->se_tfo->new_cmd_map)
c66ac9db 1958 transport_new_cmd_failure(cmd);
07bde79a
NB		 1959 else {
1960 ret = transport_send_check_condition_and_sense(cmd,
1961 cmd->scsi_sense_reason, 0);
1962 if (ret == -EAGAIN)
1963 goto queue_full;
1964 }
1965
c66ac9db
NB		 1966check_stop:
1967 transport_lun_remove_cmd(cmd);
6708bb27 1968 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1969 ;
07bde79a
NB		 1970 return;
1971
1972queue_full:
e057f533
CH		 1973 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1974 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1975}
1976
1977static void transport_direct_request_timeout(struct se_cmd *cmd)
1978{
1979 unsigned long flags;
1980
a1d8b49a 1981 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 1982 if (!atomic_read(&cmd->t_transport_timeout)) {
a1d8b49a 1983 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1984 return;
1985 }
a1d8b49a
AG		 1986 if (atomic_read(&cmd->t_task_cdbs_timeout_left)) {
1987 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1988 return;
1989 }
1990
a1d8b49a
AG		 1991 atomic_sub(atomic_read(&cmd->t_transport_timeout),
1992 &cmd->t_se_count);
1993 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1994}
1995
1996static void transport_generic_request_timeout(struct se_cmd *cmd)
1997{
1998 unsigned long flags;
1999
2000 /*
e6a2573f 2001 * Reset cmd->t_se_count to allow transport_put_cmd()
c66ac9db
NB		 2002 * to allow last call to free memory resources.
2003 */
a1d8b49a
AG		 2004 spin_lock_irqsave(&cmd->t_state_lock, flags);
2005 if (atomic_read(&cmd->t_transport_timeout) > 1) {
2006 int tmp = (atomic_read(&cmd->t_transport_timeout) - 1);
c66ac9db 2007
a1d8b49a 2008 atomic_sub(tmp, &cmd->t_se_count);
c66ac9db 2009 }
a1d8b49a 2010 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2011
e6a2573f 2012 transport_put_cmd(cmd);
c66ac9db
NB		 2013}
2014
c66ac9db
NB		 2015static inline u32 transport_lba_21(unsigned char *cdb)
2016{
2017 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2018}
2019
2020static inline u32 transport_lba_32(unsigned char *cdb)
2021{
2022 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2023}
2024
2025static inline unsigned long long transport_lba_64(unsigned char *cdb)
2026{
2027 unsigned int __v1, __v2;
2028
2029 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2030 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2031
2032 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2033}
2034
2035/*
2036 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2037 */
2038static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2039{
2040 unsigned int __v1, __v2;
2041
2042 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2043 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2044
2045 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2046}
2047
2048static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2049{
2050 unsigned long flags;
2051
a1d8b49a 2052 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 2053 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 2054 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2055}
2056
2057/*
2058 * Called from interrupt context.
2059 */
2060static void transport_task_timeout_handler(unsigned long data)
2061{
2062 struct se_task *task = (struct se_task *)data;
e3d6f909 2063 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db
NB		 2064 unsigned long flags;
2065
6708bb27 2066 pr_debug("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
c66ac9db 2067
a1d8b49a 2068 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 2069 if (task->task_flags & TF_TIMER_STOP) {
a1d8b49a 2070 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2071 return;
2072 }
6c76bf95 2073 task->task_flags &= ~TF_TIMER_RUNNING;
c66ac9db
NB		 2074
2075 /*
2076 * Determine if transport_complete_task() has already been called.
2077 */
6c76bf95
CH		 2078 if (!(task->task_flags & TF_ACTIVE)) {
2079 pr_debug("transport task: %p cmd: %p timeout !TF_ACTIVE\n",
2080 task, cmd);
a1d8b49a 2081 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2082 return;
2083 }
2084
a1d8b49a
AG		 2085 atomic_inc(&cmd->t_se_count);
2086 atomic_inc(&cmd->t_transport_timeout);
2087 cmd->t_tasks_failed = 1;
c66ac9db 2088
6c76bf95 2089 task->task_flags |= TF_TIMEOUT;
c66ac9db
NB		 2090 task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
2091 task->task_scsi_status = 1;
2092
6c76bf95
CH		 2093 if (task->task_flags & TF_REQUEST_STOP) {
2094 pr_debug("transport task: %p cmd: %p timeout TF_REQUEST_STOP"
c66ac9db 2095 " == 1\n", task, cmd);
a1d8b49a 2096 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2097 complete(&task->task_stop_comp);
2098 return;
2099 }
2100
6708bb27
AG		 2101 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
2102 pr_debug("transport task: %p cmd: %p timeout non zero"
c66ac9db 2103 " t_task_cdbs_left\n", task, cmd);
a1d8b49a 2104 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2105 return;
2106 }
6708bb27 2107 pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
c66ac9db
NB		 2108 task, cmd);
2109
2110 cmd->t_state = TRANSPORT_COMPLETE_FAILURE;
a1d8b49a 2111 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2112
f7a5cc0b 2113 transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE, false);
c66ac9db
NB		 2114}
2115
2116/*
a1d8b49a 2117 * Called with cmd->t_state_lock held.
c66ac9db
NB		 2118 */
2119static void transport_start_task_timer(struct se_task *task)
2120{
42bf829e 2121 struct se_device *dev = task->task_se_cmd->se_dev;
c66ac9db
NB		 2122 int timeout;
2123
6c76bf95 2124 if (task->task_flags & TF_TIMER_RUNNING)
c66ac9db
NB		 2125 return;
2126 /*
2127 * If the task_timeout is disabled, exit now.
2128 */
e3d6f909 2129 timeout = dev->se_sub_dev->se_dev_attrib.task_timeout;
6708bb27 2130 if (!timeout)
c66ac9db
NB		 2131 return;
2132
2133 init_timer(&task->task_timer);
2134 task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
2135 task->task_timer.data = (unsigned long) task;
2136 task->task_timer.function = transport_task_timeout_handler;
2137
6c76bf95 2138 task->task_flags |= TF_TIMER_RUNNING;
c66ac9db
NB		 2139 add_timer(&task->task_timer);
2140#if 0
6708bb27 2141 pr_debug("Starting task timer for cmd: %p task: %p seconds:"
c66ac9db
NB		 2142 " %d\n", task->task_se_cmd, task, timeout);
2143#endif
2144}
2145
2146/*
a1d8b49a 2147 * Called with spin_lock_irq(&cmd->t_state_lock) held.
c66ac9db
NB		 2148 */
2149void __transport_stop_task_timer(struct se_task *task, unsigned long *flags)
2150{
e3d6f909 2151 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db 2152
6c76bf95 2153 if (!(task->task_flags & TF_TIMER_RUNNING))
c66ac9db
NB		 2154 return;
2155
6c76bf95 2156 task->task_flags |= TF_TIMER_STOP;
a1d8b49a 2157 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
c66ac9db
NB		 2158
2159 del_timer_sync(&task->task_timer);
2160
a1d8b49a 2161 spin_lock_irqsave(&cmd->t_state_lock, *flags);
6c76bf95
CH		 2162 task->task_flags &= ~TF_TIMER_RUNNING;
2163 task->task_flags &= ~TF_TIMER_STOP;
c66ac9db
NB		 2164}
2165
2166static void transport_stop_all_task_timers(struct se_cmd *cmd)
2167{
2168 struct se_task *task = NULL, *task_tmp;
2169 unsigned long flags;
2170
a1d8b49a 2171 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2172 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2173 &cmd->t_task_list, t_list)
c66ac9db 2174 __transport_stop_task_timer(task, &flags);
a1d8b49a 2175 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2176}
2177
2178static inline int transport_tcq_window_closed(struct se_device *dev)
2179{
2180 if (dev->dev_tcq_window_closed++ <
2181 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
2182 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
2183 } else
2184 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
2185
e3d6f909 2186 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 2187 return 0;
2188}
2189
2190/*
2191 * Called from Fabric Module context from transport_execute_tasks()
2192 *
2193 * The return of this function determins if the tasks from struct se_cmd
2194 * get added to the execution queue in transport_execute_tasks(),
2195 * or are added to the delayed or ordered lists here.
2196 */
2197static inline int transport_execute_task_attr(struct se_cmd *cmd)
2198{
5951146d 2199 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 2200 return 1;
2201 /*
25985edc 2202 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 2203 * to allow the passed struct se_cmd list of tasks to the front of the list.
2204 */
e66ecd50 2205 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
5951146d 2206 atomic_inc(&cmd->se_dev->dev_hoq_count);
c66ac9db 2207 smp_mb__after_atomic_inc();
6708bb27 2208 pr_debug("Added HEAD_OF_QUEUE for CDB:"
c66ac9db 2209 " 0x%02x, se_ordered_id: %u\n",
6708bb27 2210 cmd->t_task_cdb[0],
c66ac9db
NB		 2211 cmd->se_ordered_id);
2212 return 1;
e66ecd50 2213 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d
AG		 2214 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2215 list_add_tail(&cmd->se_ordered_node,
2216 &cmd->se_dev->ordered_cmd_list);
2217 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
c66ac9db 2218
5951146d 2219 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 2220 smp_mb__after_atomic_inc();
2221
6708bb27 2222 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 2223 " list, se_ordered_id: %u\n",
a1d8b49a 2224 cmd->t_task_cdb[0],
c66ac9db
NB		 2225 cmd->se_ordered_id);
2226 /*
2227 * Add ORDERED command to tail of execution queue if
2228 * no other older commands exist that need to be
2229 * completed first.
2230 */
6708bb27 2231 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 2232 return 1;
2233 } else {
2234 /*
2235 * For SIMPLE and UNTAGGED Task Attribute commands
2236 */
5951146d 2237 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 2238 smp_mb__after_atomic_inc();
2239 }
2240 /*
2241 * Otherwise if one or more outstanding ORDERED task attribute exist,
2242 * add the dormant task(s) built for the passed struct se_cmd to the
2243 * execution queue and become in Active state for this struct se_device.
2244 */
5951146d 2245 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 2246 /*
2247 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 2248 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 2249 */
5951146d 2250 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2251 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 2252 list_add_tail(&cmd->se_delayed_node,
2253 &cmd->se_dev->delayed_cmd_list);
2254 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2255
6708bb27 2256 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 2257 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 2258 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 2259 cmd->se_ordered_id);
2260 /*
2261 * Return zero to let transport_execute_tasks() know
2262 * not to add the delayed tasks to the execution list.
2263 */
2264 return 0;
2265 }
2266 /*
2267 * Otherwise, no ORDERED task attributes exist..
2268 */
2269 return 1;
2270}
2271
2272/*
2273 * Called from fabric module context in transport_generic_new_cmd() and
2274 * transport_generic_process_write()
2275 */
2276static int transport_execute_tasks(struct se_cmd *cmd)
2277{
2278 int add_tasks;
2279
db1620a2
CH		 2280 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2281 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
2282 transport_generic_request_failure(cmd, NULL, 0, 1);
2283 return 0;
c66ac9db 2284 }
db1620a2 2285
c66ac9db
NB		 2286 /*
2287 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2288 * has occurred that prevents execution.
c66ac9db 2289 */
6708bb27 2290 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 2291 /*
2292 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2293 * attribute for the tasks of the received struct se_cmd CDB
2294 */
2295 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2296 if (!add_tasks)
c66ac9db
NB		 2297 goto execute_tasks;
2298 /*
2299 * This calls transport_add_tasks_from_cmd() to handle
2300 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2301 * (if enabled) in __transport_add_task_to_execute_queue() and
2302 * transport_add_task_check_sam_attr().
2303 */
2304 transport_add_tasks_from_cmd(cmd);
2305 }
2306 /*
2307 * Kick the execution queue for the cmd associated struct se_device
2308 * storage object.
2309 */
2310execute_tasks:
5951146d 2311 __transport_execute_tasks(cmd->se_dev);
c66ac9db
NB		 2312 return 0;
2313}
2314
2315/*
2316 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2317 * from struct se_device->execute_task_list and
2318 *
2319 * Called from transport_processing_thread()
2320 */
2321static int __transport_execute_tasks(struct se_device *dev)
2322{
2323 int error;
2324 struct se_cmd *cmd = NULL;
e3d6f909 2325 struct se_task *task = NULL;
c66ac9db
NB		 2326 unsigned long flags;
2327
2328 /*
2329 * Check if there is enough room in the device and HBA queue to send
a1d8b49a 2330 * struct se_tasks to the selected transport.
c66ac9db
NB		 2331 */
2332check_depth:
e3d6f909 2333 if (!atomic_read(&dev->depth_left))
c66ac9db 2334 return transport_tcq_window_closed(dev);
c66ac9db 2335
e3d6f909 2336 dev->dev_tcq_window_closed = 0;
c66ac9db 2337
e3d6f909
AG		 2338 spin_lock_irq(&dev->execute_task_lock);
2339 if (list_empty(&dev->execute_task_list)) {
2340 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2341 return 0;
2342 }
e3d6f909
AG		 2343 task = list_first_entry(&dev->execute_task_list,
2344 struct se_task, t_execute_list);
04629b7b 2345 __transport_remove_task_from_execute_queue(task, dev);
e3d6f909 2346 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2347
2348 atomic_dec(&dev->depth_left);
c66ac9db 2349
e3d6f909 2350 cmd = task->task_se_cmd;
c66ac9db 2351
a1d8b49a 2352 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 2353 task->task_flags |= (TF_ACTIVE | TF_SENT);
a1d8b49a 2354 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2355
a1d8b49a
AG		 2356 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2357 cmd->t_task_list_num)
c66ac9db
NB		 2358 atomic_set(&cmd->transport_sent, 1);
2359
2360 transport_start_task_timer(task);
a1d8b49a 2361 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2362 /*
2363 * The struct se_cmd->transport_emulate_cdb() function pointer is used
e3d6f909 2364 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
c66ac9db
NB		 2365 * struct se_subsystem_api->do_task() caller below.
2366 */
2367 if (cmd->transport_emulate_cdb) {
2368 error = cmd->transport_emulate_cdb(cmd);
2369 if (error != 0) {
2370 cmd->transport_error_status = error;
6c76bf95
CH		 2371 spin_lock_irqsave(&cmd->t_state_lock, flags);
2372 task->task_flags &= ~TF_ACTIVE;
2373 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2374 atomic_set(&cmd->transport_sent, 0);
2375 transport_stop_tasks_for_cmd(cmd);
2376 transport_generic_request_failure(cmd, dev, 0, 1);
2377 goto check_depth;
2378 }
2379 /*
2380 * Handle the successful completion for transport_emulate_cdb()
2381 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2382 * Otherwise the caller is expected to complete the task with
2383 * proper status.
2384 */
2385 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2386 cmd->scsi_status = SAM_STAT_GOOD;
2387 task->task_scsi_status = GOOD;
2388 transport_complete_task(task, 1);
2389 }
2390 } else {
2391 /*
2392 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2393 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2394 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2395 * LUN emulation code.
2396 *
2397 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2398 * call ->do_task() directly and let the underlying TCM subsystem plugin
2399 * code handle the CDB emulation.
2400 */
e3d6f909
AG		 2401 if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2402 (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
c66ac9db
NB		 2403 error = transport_emulate_control_cdb(task);
2404 else
e3d6f909 2405 error = dev->transport->do_task(task);
c66ac9db
NB		 2406
2407 if (error != 0) {
2408 cmd->transport_error_status = error;
6c76bf95
CH		 2409 spin_lock_irqsave(&cmd->t_state_lock, flags);
2410 task->task_flags &= ~TF_ACTIVE;
2411 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2412 atomic_set(&cmd->transport_sent, 0);
2413 transport_stop_tasks_for_cmd(cmd);
2414 transport_generic_request_failure(cmd, dev, 0, 1);
2415 }
2416 }
2417
2418 goto check_depth;
2419
2420 return 0;
2421}
2422
2423void transport_new_cmd_failure(struct se_cmd *se_cmd)
2424{
2425 unsigned long flags;
2426 /*
2427 * Any unsolicited data will get dumped for failed command inside of
2428 * the fabric plugin
2429 */
a1d8b49a 2430 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2431 se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2432 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
a1d8b49a 2433 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2434}
2435
c66ac9db
NB		 2436static inline u32 transport_get_sectors_6(
2437 unsigned char *cdb,
2438 struct se_cmd *cmd,
2439 int *ret)
2440{
5951146d 2441 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2442
2443 /*
2444 * Assume TYPE_DISK for non struct se_device objects.
2445 * Use 8-bit sector value.
2446 */
2447 if (!dev)
2448 goto type_disk;
2449
2450 /*
2451 * Use 24-bit allocation length for TYPE_TAPE.
2452 */
e3d6f909 2453 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2454 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2455
2456 /*
2457 * Everything else assume TYPE_DISK Sector CDB location.
2458 * Use 8-bit sector value.
2459 */
2460type_disk:
2461 return (u32)cdb[4];
2462}
2463
2464static inline u32 transport_get_sectors_10(
2465 unsigned char *cdb,
2466 struct se_cmd *cmd,
2467 int *ret)
2468{
5951146d 2469 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2470
2471 /*
2472 * Assume TYPE_DISK for non struct se_device objects.
2473 * Use 16-bit sector value.
2474 */
2475 if (!dev)
2476 goto type_disk;
2477
2478 /*
2479 * XXX_10 is not defined in SSC, throw an exception
2480 */
e3d6f909
AG		 2481 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2482 *ret = -EINVAL;
c66ac9db
NB		 2483 return 0;
2484 }
2485
2486 /*
2487 * Everything else assume TYPE_DISK Sector CDB location.
2488 * Use 16-bit sector value.
2489 */
2490type_disk:
2491 return (u32)(cdb[7] << 8) + cdb[8];
2492}
2493
2494static inline u32 transport_get_sectors_12(
2495 unsigned char *cdb,
2496 struct se_cmd *cmd,
2497 int *ret)
2498{
5951146d 2499 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2500
2501 /*
2502 * Assume TYPE_DISK for non struct se_device objects.
2503 * Use 32-bit sector value.
2504 */
2505 if (!dev)
2506 goto type_disk;
2507
2508 /*
2509 * XXX_12 is not defined in SSC, throw an exception
2510 */
e3d6f909
AG		 2511 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2512 *ret = -EINVAL;
c66ac9db
NB		 2513 return 0;
2514 }
2515
2516 /*
2517 * Everything else assume TYPE_DISK Sector CDB location.
2518 * Use 32-bit sector value.
2519 */
2520type_disk:
2521 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2522}
2523
2524static inline u32 transport_get_sectors_16(
2525 unsigned char *cdb,
2526 struct se_cmd *cmd,
2527 int *ret)
2528{
5951146d 2529 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2530
2531 /*
2532 * Assume TYPE_DISK for non struct se_device objects.
2533 * Use 32-bit sector value.
2534 */
2535 if (!dev)
2536 goto type_disk;
2537
2538 /*
2539 * Use 24-bit allocation length for TYPE_TAPE.
2540 */
e3d6f909 2541 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2542 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2543
2544type_disk:
2545 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2546 (cdb[12] << 8) + cdb[13];
2547}
2548
2549/*
2550 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2551 */
2552static inline u32 transport_get_sectors_32(
2553 unsigned char *cdb,
2554 struct se_cmd *cmd,
2555 int *ret)
2556{
2557 /*
2558 * Assume TYPE_DISK for non struct se_device objects.
2559 * Use 32-bit sector value.
2560 */
2561 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2562 (cdb[30] << 8) + cdb[31];
2563
2564}
2565
2566static inline u32 transport_get_size(
2567 u32 sectors,
2568 unsigned char *cdb,
2569 struct se_cmd *cmd)
2570{
5951146d 2571 struct se_device *dev = cmd->se_dev;
c66ac9db 2572
e3d6f909 2573 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2574 if (cdb[1] & 1) { /* sectors */
e3d6f909 2575 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2576 } else /* bytes */
2577 return sectors;
2578 }
2579#if 0
6708bb27 2580 pr_debug("Returning block_size: %u, sectors: %u == %u for"
e3d6f909
AG		 2581 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2582 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2583 dev->transport->name);
c66ac9db 2584#endif
e3d6f909 2585 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2586}
2587
c66ac9db
NB		 2588static void transport_xor_callback(struct se_cmd *cmd)
2589{
2590 unsigned char *buf, *addr;
ec98f782 2591 struct scatterlist *sg;
c66ac9db
NB		 2592 unsigned int offset;
2593 int i;
ec98f782 2594 int count;
c66ac9db
NB		 2595 /*
2596 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2597 *
2598 * 1) read the specified logical block(s);
2599 * 2) transfer logical blocks from the data-out buffer;
2600 * 3) XOR the logical blocks transferred from the data-out buffer with
2601 * the logical blocks read, storing the resulting XOR data in a buffer;
2602 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2603 * blocks transferred from the data-out buffer; and
2604 * 5) transfer the resulting XOR data to the data-in buffer.
2605 */
2606 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2607 if (!buf) {
2608 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2609 return;
2610 }
2611 /*
ec98f782 2612 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2613 * into the locally allocated *buf
2614 */
ec98f782
AG		 2615 sg_copy_to_buffer(cmd->t_data_sg,
2616 cmd->t_data_nents,
2617 buf,
2618 cmd->data_length);
2619
c66ac9db
NB		 2620 /*
2621 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2622 * cmd->t_mem_bidi_list
c66ac9db
NB		 2623 */
2624
2625 offset = 0;
ec98f782
AG		 2626 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2627 addr = kmap_atomic(sg_page(sg), KM_USER0);
2628 if (!addr)
c66ac9db
NB		 2629 goto out;
2630
ec98f782
AG		 2631 for (i = 0; i < sg->length; i++)
2632 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2633
ec98f782 2634 offset += sg->length;
c66ac9db
NB		 2635 kunmap_atomic(addr, KM_USER0);
2636 }
ec98f782 2637
c66ac9db
NB		 2638out:
2639 kfree(buf);
2640}
2641
2642/*
2643 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2644 */
2645static int transport_get_sense_data(struct se_cmd *cmd)
2646{
2647 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
42bf829e 2648 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2649 struct se_task *task = NULL, *task_tmp;
2650 unsigned long flags;
2651 u32 offset = 0;
2652
e3d6f909
AG		 2653 WARN_ON(!cmd->se_lun);
2654
42bf829e
CH		 2655 if (!dev)
2656 return 0;
2657
a1d8b49a 2658 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2659 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2660 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2661 return 0;
2662 }
2663
2664 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2665 &cmd->t_task_list, t_list) {
c66ac9db
NB		 2666 if (!task->task_sense)
2667 continue;
2668
e3d6f909 2669 if (!dev->transport->get_sense_buffer) {
6708bb27 2670 pr_err("dev->transport->get_sense_buffer"
c66ac9db
NB		 2671 " is NULL\n");
2672 continue;
2673 }
2674
e3d6f909 2675 sense_buffer = dev->transport->get_sense_buffer(task);
6708bb27 2676 if (!sense_buffer) {
04629b7b 2677 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
c66ac9db 2678 " sense buffer for task with sense\n",
04629b7b 2679 cmd->se_tfo->get_task_tag(cmd), task);
c66ac9db
NB		 2680 continue;
2681 }
a1d8b49a 2682 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2683
e3d6f909 2684 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2685 TRANSPORT_SENSE_BUFFER);
2686
5951146d 2687 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2688 TRANSPORT_SENSE_BUFFER);
2689 cmd->scsi_status = task->task_scsi_status;
2690 /* Automatically padded */
2691 cmd->scsi_sense_length =
2692 (TRANSPORT_SENSE_BUFFER + offset);
2693
6708bb27 2694 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
c66ac9db 2695 " and sense\n",
e3d6f909 2696 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2697 cmd->scsi_status);
2698 return 0;
2699 }
a1d8b49a 2700 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2701
2702 return -1;
2703}
2704
c66ac9db
NB		 2705static int
2706transport_handle_reservation_conflict(struct se_cmd *cmd)
2707{
c66ac9db
NB		 2708 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2709 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2710 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2711 /*
2712 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2713 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2714 * CONFLICT STATUS.
2715 *
2716 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2717 */
e3d6f909
AG		 2718 if (cmd->se_sess &&
2719 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2720 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 2721 cmd->orig_fe_lun, 0x2C,
2722 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
5951146d 2723 return -EINVAL;
c66ac9db
NB		 2724}
2725
ec98f782
AG		 2726static inline long long transport_dev_end_lba(struct se_device *dev)
2727{
2728 return dev->transport->get_blocks(dev) + 1;
2729}
2730
2731static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2732{
2733 struct se_device *dev = cmd->se_dev;
2734 u32 sectors;
2735
2736 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2737 return 0;
2738
2739 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2740
6708bb27
AG		 2741 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2742 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2743 " transport_dev_end_lba(): %llu\n",
2744 cmd->t_task_lba, sectors,
2745 transport_dev_end_lba(dev));
7abbe7f3 2746 return -EINVAL;
ec98f782
AG		 2747 }
2748
7abbe7f3 2749 return 0;
ec98f782
AG		 2750}
2751
706d5860
NB		 2752static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2753{
2754 /*
2755 * Determine if the received WRITE_SAME is used to for direct
2756 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2757 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2758 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2759 */
2760 int passthrough = (dev->transport->transport_type ==
2761 TRANSPORT_PLUGIN_PHBA_PDEV);
2762
2763 if (!passthrough) {
2764 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2765 pr_err("WRITE_SAME PBDATA and LBDATA"
2766 " bits not supported for Block Discard"
2767 " Emulation\n");
2768 return -ENOSYS;
2769 }
2770 /*
2771 * Currently for the emulated case we only accept
2772 * tpws with the UNMAP=1 bit set.
2773 */
2774 if (!(flags[0] & 0x08)) {
2775 pr_err("WRITE_SAME w/o UNMAP bit not"
2776 " supported for Block Discard Emulation\n");
2777 return -ENOSYS;
2778 }
2779 }
2780
2781 return 0;
2782}
2783
c66ac9db
NB		 2784/* transport_generic_cmd_sequencer():
2785 *
2786 * Generic Command Sequencer that should work for most DAS transport
2787 * drivers.
2788 *
2789 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2790 * RX Thread.
2791 *
2792 * FIXME: Need to support other SCSI OPCODES where as well.
2793 */
2794static int transport_generic_cmd_sequencer(
2795 struct se_cmd *cmd,
2796 unsigned char *cdb)
2797{
5951146d 2798 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2799 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2800 int ret = 0, sector_ret = 0, passthrough;
2801 u32 sectors = 0, size = 0, pr_reg_type = 0;
2802 u16 service_action;
2803 u8 alua_ascq = 0;
2804 /*
2805 * Check for an existing UNIT ATTENTION condition
2806 */
2807 if (core_scsi3_ua_check(cmd, cdb) < 0) {
c66ac9db
NB		 2808 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2809 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2810 return -EINVAL;
c66ac9db
NB		 2811 }
2812 /*
2813 * Check status of Asymmetric Logical Unit Assignment port
2814 */
e3d6f909 2815 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db 2816 if (ret != 0) {
c66ac9db 2817 /*
25985edc 2818 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2819 * The ALUA additional sense code qualifier (ASCQ) is determined
2820 * by the ALUA primary or secondary access state..
2821 */
2822 if (ret > 0) {
2823#if 0
6708bb27 2824 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2825 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2826 cmd->se_tfo->get_fabric_name(), alua_ascq);
c66ac9db
NB		 2827#endif
2828 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2829 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2830 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2831 return -EINVAL;
c66ac9db
NB		 2832 }
2833 goto out_invalid_cdb_field;
2834 }
2835 /*
2836 * Check status for SPC-3 Persistent Reservations
2837 */
e3d6f909
AG		 2838 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2839 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
c66ac9db
NB		 2840 cmd, cdb, pr_reg_type) != 0)
2841 return transport_handle_reservation_conflict(cmd);
2842 /*
2843 * This means the CDB is allowed for the SCSI Initiator port
2844 * when said port is *NOT* holding the legacy SPC-2 or
2845 * SPC-3 Persistent Reservation.
2846 */
2847 }
2848
2849 switch (cdb[0]) {
2850 case READ_6:
2851 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2852 if (sector_ret)
2853 goto out_unsupported_cdb;
2854 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2855 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2856 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2857 break;
2858 case READ_10:
2859 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2860 if (sector_ret)
2861 goto out_unsupported_cdb;
2862 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2863 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2864 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2865 break;
2866 case READ_12:
2867 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2868 if (sector_ret)
2869 goto out_unsupported_cdb;
2870 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2871 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2872 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2873 break;
2874 case READ_16:
2875 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2876 if (sector_ret)
2877 goto out_unsupported_cdb;
2878 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2879 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2880 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2881 break;
2882 case WRITE_6:
2883 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2884 if (sector_ret)
2885 goto out_unsupported_cdb;
2886 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2887 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2888 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2889 break;
2890 case WRITE_10:
2891 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2892 if (sector_ret)
2893 goto out_unsupported_cdb;
2894 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a
AG		 2895 cmd->t_task_lba = transport_lba_32(cdb);
2896 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2897 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2898 break;
2899 case WRITE_12:
2900 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2901 if (sector_ret)
2902 goto out_unsupported_cdb;
2903 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a
AG		 2904 cmd->t_task_lba = transport_lba_32(cdb);
2905 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2906 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2907 break;
2908 case WRITE_16:
2909 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2910 if (sector_ret)
2911 goto out_unsupported_cdb;
2912 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a
AG		 2913 cmd->t_task_lba = transport_lba_64(cdb);
2914 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2915 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2916 break;
2917 case XDWRITEREAD_10:
2918 if ((cmd->data_direction != DMA_TO_DEVICE) ||
a1d8b49a 2919 !(cmd->t_tasks_bidi))
c66ac9db
NB		 2920 goto out_invalid_cdb_field;
2921 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2922 if (sector_ret)
2923 goto out_unsupported_cdb;
2924 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2925 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 2926 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
e3d6f909 2927 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 2928 TRANSPORT_PLUGIN_PHBA_PDEV);
2929 /*
2930 * Skip the remaining assignments for TCM/PSCSI passthrough
2931 */
2932 if (passthrough)
2933 break;
2934 /*
2935 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
2936 */
2937 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 2938 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2939 break;
2940 case VARIABLE_LENGTH_CMD:
2941 service_action = get_unaligned_be16(&cdb[8]);
2942 /*
2943 * Determine if this is TCM/PSCSI device and we should disable
2944 * internal emulation for this CDB.
2945 */
e3d6f909 2946 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 2947 TRANSPORT_PLUGIN_PHBA_PDEV);
2948
2949 switch (service_action) {
2950 case XDWRITEREAD_32:
2951 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2952 if (sector_ret)
2953 goto out_unsupported_cdb;
2954 size = transport_get_size(sectors, cdb, cmd);
2955 /*
2956 * Use WRITE_32 and READ_32 opcodes for the emulated
2957 * XDWRITE_READ_32 logic.
2958 */
a1d8b49a 2959 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 2960 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2961
2962 /*
2963 * Skip the remaining assignments for TCM/PSCSI passthrough
2964 */
2965 if (passthrough)
2966 break;
2967
2968 /*
2969 * Setup BIDI XOR callback to be run during
2970 * transport_generic_complete_ok()
2971 */
2972 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 2973 cmd->t_tasks_fua = (cdb[10] & 0x8);
c66ac9db
NB		 2974 break;
2975 case WRITE_SAME_32:
2976 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2977 if (sector_ret)
2978 goto out_unsupported_cdb;
dd3a5ad8 2979
6708bb27 2980 if (sectors)
12850626 2981 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2982 else {
2983 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2984 " supported\n");
2985 goto out_invalid_cdb_field;
2986 }
dd3a5ad8 2987
a1d8b49a 2988 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 2989 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2990
706d5860 2991 if (target_check_write_same_discard(&cdb[10], dev) < 0)
c66ac9db 2992 goto out_invalid_cdb_field;
706d5860 2993
c66ac9db
NB		 2994 break;
2995 default:
6708bb27 2996 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 2997 " 0x%04x not supported\n", service_action);
2998 goto out_unsupported_cdb;
2999 }
3000 break;
e434f1f1 3001 case MAINTENANCE_IN:
e3d6f909 3002 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 3003 /* MAINTENANCE_IN from SCC-2 */
3004 /*
3005 * Check for emulated MI_REPORT_TARGET_PGS.
3006 */
3007 if (cdb[1] == MI_REPORT_TARGET_PGS) {
3008 cmd->transport_emulate_cdb =
e3d6f909 3009 (su_dev->t10_alua.alua_type ==
c66ac9db 3010 SPC3_ALUA_EMULATED) ?
e3d6f909 3011 core_emulate_report_target_port_groups :
c66ac9db
NB		 3012 NULL;
3013 }
3014 size = (cdb[6] << 24) | (cdb[7] << 16) |
3015 (cdb[8] << 8) | cdb[9];
3016 } else {
3017 /* GPCMD_SEND_KEY from multi media commands */
3018 size = (cdb[8] << 8) + cdb[9];
3019 }
05d1c7c0 3020 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3021 break;
3022 case MODE_SELECT:
3023 size = cdb[4];
3024 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3025 break;
3026 case MODE_SELECT_10:
3027 size = (cdb[7] << 8) + cdb[8];
3028 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3029 break;
3030 case MODE_SENSE:
3031 size = cdb[4];
05d1c7c0 3032 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3033 break;
3034 case MODE_SENSE_10:
3035 case GPCMD_READ_BUFFER_CAPACITY:
3036 case GPCMD_SEND_OPC:
3037 case LOG_SELECT:
3038 case LOG_SENSE:
3039 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 3040 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3041 break;
3042 case READ_BLOCK_LIMITS:
3043 size = READ_BLOCK_LEN;
05d1c7c0 3044 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3045 break;
3046 case GPCMD_GET_CONFIGURATION:
3047 case GPCMD_READ_FORMAT_CAPACITIES:
3048 case GPCMD_READ_DISC_INFO:
3049 case GPCMD_READ_TRACK_RZONE_INFO:
3050 size = (cdb[7] << 8) + cdb[8];
3051 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3052 break;
3053 case PERSISTENT_RESERVE_IN:
3054 case PERSISTENT_RESERVE_OUT:
3055 cmd->transport_emulate_cdb =
e3d6f909 3056 (su_dev->t10_pr.res_type ==
c66ac9db 3057 SPC3_PERSISTENT_RESERVATIONS) ?
e3d6f909 3058 core_scsi3_emulate_pr : NULL;
c66ac9db 3059 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 3060 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3061 break;
3062 case GPCMD_MECHANISM_STATUS:
3063 case GPCMD_READ_DVD_STRUCTURE:
3064 size = (cdb[8] << 8) + cdb[9];
3065 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3066 break;
3067 case READ_POSITION:
3068 size = READ_POSITION_LEN;
05d1c7c0 3069 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 3070 break;
e434f1f1 3071 case MAINTENANCE_OUT:
e3d6f909 3072 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 3073 /* MAINTENANCE_OUT from SCC-2
3074 *
3075 * Check for emulated MO_SET_TARGET_PGS.
3076 */
3077 if (cdb[1] == MO_SET_TARGET_PGS) {
3078 cmd->transport_emulate_cdb =
e3d6f909 3079 (su_dev->t10_alua.alua_type ==
c66ac9db 3080 SPC3_ALUA_EMULATED) ?
e3d6f909 3081 core_emulate_set_target_port_groups :
c66ac9db
NB		 3082 NULL;
3083 }
3084
3085 size = (cdb[6] << 24) | (cdb[7] << 16) |
3086 (cdb[8] << 8) | cdb[9];
3087 } else {
3088 /* GPCMD_REPORT_KEY from multi media commands */
3089 size = (cdb[8] << 8) + cdb[9];
3090 }
05d1c7c0 3091 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3092 break;
3093 case INQUIRY:
3094 size = (cdb[3] << 8) + cdb[4];
3095 /*
3096 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3097 * See spc4r17 section 5.3
3098 */
5951146d 3099 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3100 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3101 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3102 break;
3103 case READ_BUFFER:
3104 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 3105 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3106 break;
3107 case READ_CAPACITY:
3108 size = READ_CAP_LEN;
05d1c7c0 3109 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3110 break;
3111 case READ_MEDIA_SERIAL_NUMBER:
3112 case SECURITY_PROTOCOL_IN:
3113 case SECURITY_PROTOCOL_OUT:
3114 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 3115 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3116 break;
3117 case SERVICE_ACTION_IN:
3118 case ACCESS_CONTROL_IN:
3119 case ACCESS_CONTROL_OUT:
3120 case EXTENDED_COPY:
3121 case READ_ATTRIBUTE:
3122 case RECEIVE_COPY_RESULTS:
3123 case WRITE_ATTRIBUTE:
3124 size = (cdb[10] << 24) | (cdb[11] << 16) |
3125 (cdb[12] << 8) | cdb[13];
05d1c7c0 3126 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3127 break;
3128 case RECEIVE_DIAGNOSTIC:
3129 case SEND_DIAGNOSTIC:
3130 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 3131 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3132 break;
3133/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3134#if 0
3135 case GPCMD_READ_CD:
3136 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3137 size = (2336 * sectors);
05d1c7c0 3138 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3139 break;
3140#endif
3141 case READ_TOC:
3142 size = cdb[8];
05d1c7c0 3143 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3144 break;
3145 case REQUEST_SENSE:
3146 size = cdb[4];
05d1c7c0 3147 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3148 break;
3149 case READ_ELEMENT_STATUS:
3150 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 3151 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3152 break;
3153 case WRITE_BUFFER:
3154 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 3155 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3156 break;
3157 case RESERVE:
3158 case RESERVE_10:
3159 /*
3160 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3161 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3162 */
3163 if (cdb[0] == RESERVE_10)
3164 size = (cdb[7] << 8) | cdb[8];
3165 else
3166 size = cmd->data_length;
3167
3168 /*
3169 * Setup the legacy emulated handler for SPC-2 and
3170 * >= SPC-3 compatible reservation handling (CRH=1)
3171 * Otherwise, we assume the underlying SCSI logic is
3172 * is running in SPC_PASSTHROUGH, and wants reservations
3173 * emulation disabled.
3174 */
3175 cmd->transport_emulate_cdb =
e3d6f909 3176 (su_dev->t10_pr.res_type !=
c66ac9db 3177 SPC_PASSTHROUGH) ?
e3d6f909 3178 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 3179 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3180 break;
3181 case RELEASE:
3182 case RELEASE_10:
3183 /*
3184 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3185 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3186 */
3187 if (cdb[0] == RELEASE_10)
3188 size = (cdb[7] << 8) | cdb[8];
3189 else
3190 size = cmd->data_length;
3191
3192 cmd->transport_emulate_cdb =
e3d6f909 3193 (su_dev->t10_pr.res_type !=
c66ac9db 3194 SPC_PASSTHROUGH) ?
e3d6f909 3195 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 3196 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3197 break;
3198 case SYNCHRONIZE_CACHE:
3199 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3200 /*
3201 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3202 */
3203 if (cdb[0] == SYNCHRONIZE_CACHE) {
3204 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 3205 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 3206 } else {
3207 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 3208 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 3209 }
3210 if (sector_ret)
3211 goto out_unsupported_cdb;
3212
3213 size = transport_get_size(sectors, cdb, cmd);
3214 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3215
3216 /*
3217 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3218 */
e3d6f909 3219 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 3220 break;
3221 /*
3222 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3223 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3224 */
3225 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3226 /*
3227 * Check to ensure that LBA + Range does not exceed past end of
7abbe7f3 3228 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
c66ac9db 3229 */
7abbe7f3
NB		 3230 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
3231 if (transport_cmd_get_valid_sectors(cmd) < 0)
3232 goto out_invalid_cdb_field;
3233 }
c66ac9db
NB		 3234 break;
3235 case UNMAP:
3236 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 3237 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3238 break;
3239 case WRITE_SAME_16:
3240 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3241 if (sector_ret)
3242 goto out_unsupported_cdb;
dd3a5ad8 3243
6708bb27 3244 if (sectors)
12850626 3245 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 3246 else {
3247 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3248 goto out_invalid_cdb_field;
3249 }
dd3a5ad8 3250
5db0753b 3251 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
706d5860
NB		 3252 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3253
3254 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3255 goto out_invalid_cdb_field;
3256 break;
3257 case WRITE_SAME:
3258 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3259 if (sector_ret)
3260 goto out_unsupported_cdb;
3261
3262 if (sectors)
12850626 3263 size = transport_get_size(1, cdb, cmd);
706d5860
NB		 3264 else {
3265 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3266 goto out_invalid_cdb_field;
c66ac9db 3267 }
706d5860
NB		 3268
3269 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
c66ac9db 3270 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
706d5860
NB		 3271 /*
3272 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3273 * of byte 1 bit 3 UNMAP instead of original reserved field
3274 */
3275 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3276 goto out_invalid_cdb_field;
c66ac9db
NB		 3277 break;
3278 case ALLOW_MEDIUM_REMOVAL:
3279 case GPCMD_CLOSE_TRACK:
3280 case ERASE:
3281 case INITIALIZE_ELEMENT_STATUS:
3282 case GPCMD_LOAD_UNLOAD:
3283 case REZERO_UNIT:
3284 case SEEK_10:
3285 case GPCMD_SET_SPEED:
3286 case SPACE:
3287 case START_STOP:
3288 case TEST_UNIT_READY:
3289 case VERIFY:
3290 case WRITE_FILEMARKS:
3291 case MOVE_MEDIUM:
3292 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3293 break;
3294 case REPORT_LUNS:
3295 cmd->transport_emulate_cdb =
e3d6f909 3296 transport_core_report_lun_response;
c66ac9db
NB		 3297 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3298 /*
3299 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3300 * See spc4r17 section 5.3
3301 */
5951146d 3302 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3303 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3304 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3305 break;
3306 default:
6708bb27 3307 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 3308 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3309 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3310 goto out_unsupported_cdb;
3311 }
3312
3313 if (size != cmd->data_length) {
6708bb27 3314 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 3315 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3316 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3317 cmd->data_length, size, cdb[0]);
3318
3319 cmd->cmd_spdtl = size;
3320
3321 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 3322 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 3323 " WRITE data\n");
3324 goto out_invalid_cdb_field;
3325 }
3326 /*
3327 * Reject READ_* or WRITE_* with overflow/underflow for
3328 * type SCF_SCSI_DATA_SG_IO_CDB.
3329 */
6708bb27
AG		 3330 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3331 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 3332 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3333 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3334 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3335 goto out_invalid_cdb_field;
3336 }
3337
3338 if (size > cmd->data_length) {
3339 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3340 cmd->residual_count = (size - cmd->data_length);
3341 } else {
3342 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3343 cmd->residual_count = (cmd->data_length - size);
3344 }
3345 cmd->data_length = size;
3346 }
3347
d0229ae3
AG		 3348 /* Let's limit control cdbs to a page, for simplicity's sake. */
3349 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3350 size > PAGE_SIZE)
3351 goto out_invalid_cdb_field;
3352
c66ac9db
NB		 3353 transport_set_supported_SAM_opcode(cmd);
3354 return ret;
3355
3356out_unsupported_cdb:
3357 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3358 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3359 return -EINVAL;
c66ac9db
NB		 3360out_invalid_cdb_field:
3361 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3362 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3363 return -EINVAL;
c66ac9db
NB		 3364}
3365
c66ac9db
NB		 3366/*
3367 * Called from transport_generic_complete_ok() and
3368 * transport_generic_request_failure() to determine which dormant/delayed
3369 * and ordered cmds need to have their tasks added to the execution queue.
3370 */
3371static void transport_complete_task_attr(struct se_cmd *cmd)
3372{
5951146d 3373 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3374 struct se_cmd *cmd_p, *cmd_tmp;
3375 int new_active_tasks = 0;
3376
e66ecd50 3377 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3378 atomic_dec(&dev->simple_cmds);
3379 smp_mb__after_atomic_dec();
3380 dev->dev_cur_ordered_id++;
6708bb27 3381 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3382 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3383 cmd->se_ordered_id);
e66ecd50 3384 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 3385 atomic_dec(&dev->dev_hoq_count);
3386 smp_mb__after_atomic_dec();
3387 dev->dev_cur_ordered_id++;
6708bb27 3388 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3389 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3390 cmd->se_ordered_id);
e66ecd50 3391 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db 3392 spin_lock(&dev->ordered_cmd_lock);
5951146d 3393 list_del(&cmd->se_ordered_node);
c66ac9db
NB		 3394 atomic_dec(&dev->dev_ordered_sync);
3395 smp_mb__after_atomic_dec();
3396 spin_unlock(&dev->ordered_cmd_lock);
3397
3398 dev->dev_cur_ordered_id++;
6708bb27 3399 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3400 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3401 }
3402 /*
3403 * Process all commands up to the last received
3404 * ORDERED task attribute which requires another blocking
3405 * boundary
3406 */
3407 spin_lock(&dev->delayed_cmd_lock);
3408 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3409 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3410
5951146d 3411 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3412 spin_unlock(&dev->delayed_cmd_lock);
3413
6708bb27 3414 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3415 " cmd_p: 0x%02x Task Attr: 0x%02x"
3416 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3417 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3418 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3419
3420 transport_add_tasks_from_cmd(cmd_p);
3421 new_active_tasks++;
3422
3423 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3424 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3425 break;
3426 }
3427 spin_unlock(&dev->delayed_cmd_lock);
3428 /*
3429 * If new tasks have become active, wake up the transport thread
3430 * to do the processing of the Active tasks.
3431 */
3432 if (new_active_tasks != 0)
e3d6f909 3433 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3434}
3435
e057f533 3436static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 3437{
3438 int ret = 0;
3439
e057f533
CH		 3440 transport_stop_all_task_timers(cmd);
3441 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3442 transport_complete_task_attr(cmd);
3443
3444 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3445 ret = cmd->se_tfo->queue_status(cmd);
3446 if (ret)
3447 goto out;
3448 }
07bde79a
NB		 3449
3450 switch (cmd->data_direction) {
3451 case DMA_FROM_DEVICE:
3452 ret = cmd->se_tfo->queue_data_in(cmd);
3453 break;
3454 case DMA_TO_DEVICE:
ec98f782 3455 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3456 ret = cmd->se_tfo->queue_data_in(cmd);
3457 if (ret < 0)
e057f533 3458 break;
07bde79a
NB		 3459 }
3460 /* Fall through for DMA_TO_DEVICE */
3461 case DMA_NONE:
3462 ret = cmd->se_tfo->queue_status(cmd);
3463 break;
3464 default:
3465 break;
3466 }
3467
e057f533
CH		 3468out:
3469 if (ret < 0) {
3470 transport_handle_queue_full(cmd, cmd->se_dev);
3471 return;
3472 }
3473 transport_lun_remove_cmd(cmd);
3474 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3475}
3476
3477static void transport_handle_queue_full(
3478 struct se_cmd *cmd,
e057f533 3479 struct se_device *dev)
07bde79a
NB		 3480{
3481 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 3482 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3483 atomic_inc(&dev->dev_qf_count);
3484 smp_mb__after_atomic_inc();
3485 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3486
3487 schedule_work(&cmd->se_dev->qf_work_queue);
3488}
3489
c66ac9db
NB		 3490static void transport_generic_complete_ok(struct se_cmd *cmd)
3491{
07bde79a 3492 int reason = 0, ret;
c66ac9db
NB		 3493 /*
3494 * Check if we need to move delayed/dormant tasks from cmds on the
3495 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3496 * Attribute.
3497 */
5951146d 3498 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3499 transport_complete_task_attr(cmd);
07bde79a
NB		 3500 /*
3501 * Check to schedule QUEUE_FULL work, or execute an existing
3502 * cmd->transport_qf_callback()
3503 */
3504 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3505 schedule_work(&cmd->se_dev->qf_work_queue);
3506
c66ac9db
NB		 3507 /*
3508 * Check if we need to retrieve a sense buffer from
3509 * the struct se_cmd in question.
3510 */
3511 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3512 if (transport_get_sense_data(cmd) < 0)
3513 reason = TCM_NON_EXISTENT_LUN;
3514
3515 /*
3516 * Only set when an struct se_task->task_scsi_status returned
3517 * a non GOOD status.
3518 */
3519 if (cmd->scsi_status) {
07bde79a 3520 ret = transport_send_check_condition_and_sense(
c66ac9db 3521 cmd, reason, 1);
07bde79a
NB		 3522 if (ret == -EAGAIN)
3523 goto queue_full;
3524
c66ac9db
NB		 3525 transport_lun_remove_cmd(cmd);
3526 transport_cmd_check_stop_to_fabric(cmd);
3527 return;
3528 }
3529 }
3530 /*
25985edc 3531 * Check for a callback, used by amongst other things
c66ac9db
NB		 3532 * XDWRITE_READ_10 emulation.
3533 */
3534 if (cmd->transport_complete_callback)
3535 cmd->transport_complete_callback(cmd);
3536
3537 switch (cmd->data_direction) {
3538 case DMA_FROM_DEVICE:
3539 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3540 if (cmd->se_lun->lun_sep) {
3541 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3542 cmd->data_length;
3543 }
3544 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3545
07bde79a
NB		 3546 ret = cmd->se_tfo->queue_data_in(cmd);
3547 if (ret == -EAGAIN)
3548 goto queue_full;
c66ac9db
NB		 3549 break;
3550 case DMA_TO_DEVICE:
3551 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3552 if (cmd->se_lun->lun_sep) {
3553 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3554 cmd->data_length;
3555 }
3556 spin_unlock(&cmd->se_lun->lun_sep_lock);
3557 /*
3558 * Check if we need to send READ payload for BIDI-COMMAND
3559 */
ec98f782 3560 if (cmd->t_bidi_data_sg) {
c66ac9db 3561 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3562 if (cmd->se_lun->lun_sep) {
3563 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3564 cmd->data_length;
3565 }
3566 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a
NB		 3567 ret = cmd->se_tfo->queue_data_in(cmd);
3568 if (ret == -EAGAIN)
3569 goto queue_full;
c66ac9db
NB		 3570 break;
3571 }
3572 /* Fall through for DMA_TO_DEVICE */
3573 case DMA_NONE:
07bde79a
NB		 3574 ret = cmd->se_tfo->queue_status(cmd);
3575 if (ret == -EAGAIN)
3576 goto queue_full;
c66ac9db
NB		 3577 break;
3578 default:
3579 break;
3580 }
3581
3582 transport_lun_remove_cmd(cmd);
3583 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3584 return;
3585
3586queue_full:
6708bb27 3587 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 3588 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 3589 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3590 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 3591}
3592
3593static void transport_free_dev_tasks(struct se_cmd *cmd)
3594{
3595 struct se_task *task, *task_tmp;
3596 unsigned long flags;
0c2cfe5f 3597 LIST_HEAD(dispose_list);
c66ac9db 3598
a1d8b49a 3599 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3600 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3601 &cmd->t_task_list, t_list) {
0c2cfe5f
CH		 3602 if (!(task->task_flags & TF_ACTIVE))
3603 list_move_tail(&task->t_list, &dispose_list);
3604 }
3605 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3606
3607 while (!list_empty(&dispose_list)) {
3608 task = list_first_entry(&dispose_list, struct se_task, t_list);
c66ac9db
NB		 3609
3610 kfree(task->task_sg_bidi);
3611 kfree(task->task_sg);
3612
3613 list_del(&task->t_list);
3614
42bf829e 3615 cmd->se_dev->transport->free_task(task);
c66ac9db 3616 }
c66ac9db
NB		 3617}
3618
6708bb27 3619static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3620{
ec98f782 3621 struct scatterlist *sg;
ec98f782 3622 int count;
c66ac9db 3623
6708bb27
AG		 3624 for_each_sg(sgl, sg, nents, count)
3625 __free_page(sg_page(sg));
c66ac9db 3626
6708bb27
AG		 3627 kfree(sgl);
3628}
c66ac9db 3629
6708bb27
AG		 3630static inline void transport_free_pages(struct se_cmd *cmd)
3631{
3632 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3633 return;
3634
3635 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3636 cmd->t_data_sg = NULL;
3637 cmd->t_data_nents = 0;
c66ac9db 3638
6708bb27 3639 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3640 cmd->t_bidi_data_sg = NULL;
3641 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3642}
3643
d3df7825
CH		 3644/**
3645 * transport_put_cmd - release a reference to a command
3646 * @cmd: command to release
3647 *
3648 * This routine releases our reference to the command and frees it if possible.
3649 */
39c05f32 3650static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 3651{
3652 unsigned long flags;
4911e3cc 3653 int free_tasks = 0;
c66ac9db 3654
a1d8b49a 3655 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 3656 if (atomic_read(&cmd->t_fe_count)) {
3657 if (!atomic_dec_and_test(&cmd->t_fe_count))
3658 goto out_busy;
3659 }
3660
3661 if (atomic_read(&cmd->t_se_count)) {
3662 if (!atomic_dec_and_test(&cmd->t_se_count))
3663 goto out_busy;
3664 }
3665
3666 if (atomic_read(&cmd->transport_dev_active)) {
3667 atomic_set(&cmd->transport_dev_active, 0);
3668 transport_all_task_dev_remove_state(cmd);
3669 free_tasks = 1;
c66ac9db 3670 }
a1d8b49a 3671 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3672
4911e3cc
CH		 3673 if (free_tasks != 0)
3674 transport_free_dev_tasks(cmd);
d3df7825 3675
c66ac9db 3676 transport_free_pages(cmd);
31afc39c 3677 transport_release_cmd(cmd);
39c05f32 3678 return;
4911e3cc
CH		 3679out_busy:
3680 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3681}
3682
c66ac9db 3683/*
ec98f782
AG		 3684 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3685 * allocating in the core.
c66ac9db
NB		 3686 * @cmd: Associated se_cmd descriptor
3687 * @mem: SGL style memory for TCM WRITE / READ
3688 * @sg_mem_num: Number of SGL elements
3689 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3690 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3691 *
3692 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3693 * of parameters.
3694 */
3695int transport_generic_map_mem_to_cmd(
3696 struct se_cmd *cmd,
5951146d
AG		 3697 struct scatterlist *sgl,
3698 u32 sgl_count,
3699 struct scatterlist *sgl_bidi,
3700 u32 sgl_bidi_count)
c66ac9db 3701{
5951146d 3702 if (!sgl || !sgl_count)
c66ac9db 3703 return 0;
c66ac9db 3704
c66ac9db
NB		 3705 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3706 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
c66ac9db 3707
ec98f782
AG		 3708 cmd->t_data_sg = sgl;
3709 cmd->t_data_nents = sgl_count;
c66ac9db 3710
ec98f782
AG		 3711 if (sgl_bidi && sgl_bidi_count) {
3712 cmd->t_bidi_data_sg = sgl_bidi;
3713 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3714 }
3715 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3716 }
3717
3718 return 0;
3719}
3720EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3721
c66ac9db
NB		 3722static int transport_new_cmd_obj(struct se_cmd *cmd)
3723{
5951146d 3724 struct se_device *dev = cmd->se_dev;
01cde4d5 3725 int set_counts = 1, rc, task_cdbs;
c66ac9db 3726
ec98f782
AG		 3727 /*
3728 * Setup any BIDI READ tasks and memory from
3729 * cmd->t_mem_bidi_list so the READ struct se_tasks
3730 * are queued first for the non pSCSI passthrough case.
3731 */
3732 if (cmd->t_bidi_data_sg &&
3733 (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) {
3734 rc = transport_allocate_tasks(cmd,
3735 cmd->t_task_lba,
3736 DMA_FROM_DEVICE,
3737 cmd->t_bidi_data_sg,
3738 cmd->t_bidi_data_nents);
6708bb27 3739 if (rc <= 0) {
c66ac9db
NB		 3740 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3741 cmd->scsi_sense_reason =
ec98f782 3742 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
01cde4d5 3743 return -EINVAL;
c66ac9db 3744 }
ec98f782
AG		 3745 atomic_inc(&cmd->t_fe_count);
3746 atomic_inc(&cmd->t_se_count);
3747 set_counts = 0;
3748 }
3749 /*
3750 * Setup the tasks and memory from cmd->t_mem_list
3751 * Note for BIDI transfers this will contain the WRITE payload
3752 */
3753 task_cdbs = transport_allocate_tasks(cmd,
3754 cmd->t_task_lba,
3755 cmd->data_direction,
3756 cmd->t_data_sg,
3757 cmd->t_data_nents);
6708bb27 3758 if (task_cdbs <= 0) {
ec98f782
AG		 3759 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3760 cmd->scsi_sense_reason =
3761 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
01cde4d5 3762 return -EINVAL;
ec98f782 3763 }
c66ac9db 3764
ec98f782
AG		 3765 if (set_counts) {
3766 atomic_inc(&cmd->t_fe_count);
3767 atomic_inc(&cmd->t_se_count);
c66ac9db
NB		 3768 }
3769
ec98f782
AG		 3770 cmd->t_task_list_num = task_cdbs;
3771
a1d8b49a
AG		 3772 atomic_set(&cmd->t_task_cdbs_left, task_cdbs);
3773 atomic_set(&cmd->t_task_cdbs_ex_left, task_cdbs);
3774 atomic_set(&cmd->t_task_cdbs_timeout_left, task_cdbs);
c66ac9db
NB		 3775 return 0;
3776}
3777
05d1c7c0
AG		 3778void *transport_kmap_first_data_page(struct se_cmd *cmd)
3779{
ec98f782 3780 struct scatterlist *sg = cmd->t_data_sg;
05d1c7c0 3781
ec98f782 3782 BUG_ON(!sg);
05d1c7c0 3783 /*
ec98f782
AG		 3784 * We need to take into account a possible offset here for fabrics like
3785 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3786 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3787 */
ec98f782 3788 return kmap(sg_page(sg)) + sg->offset;
05d1c7c0
AG		 3789}
3790EXPORT_SYMBOL(transport_kmap_first_data_page);
3791
3792void transport_kunmap_first_data_page(struct se_cmd *cmd)
3793{
ec98f782 3794 kunmap(sg_page(cmd->t_data_sg));
05d1c7c0
AG		 3795}
3796EXPORT_SYMBOL(transport_kunmap_first_data_page);
3797
c66ac9db 3798static int
05d1c7c0 3799transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3800{
ec98f782
AG		 3801 u32 length = cmd->data_length;
3802 unsigned int nents;
3803 struct page *page;
3804 int i = 0;
c66ac9db 3805
ec98f782
AG		 3806 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3807 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3808 if (!cmd->t_data_sg)
3809 return -ENOMEM;
c66ac9db 3810
ec98f782
AG		 3811 cmd->t_data_nents = nents;
3812 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3813
ec98f782
AG		 3814 while (length) {
3815 u32 page_len = min_t(u32, length, PAGE_SIZE);
3816 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3817 if (!page)
3818 goto out;
c66ac9db 3819
ec98f782
AG		 3820 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3821 length -= page_len;
3822 i++;
c66ac9db 3823 }
c66ac9db 3824 return 0;
c66ac9db 3825
ec98f782
AG		 3826out:
3827 while (i >= 0) {
3828 __free_page(sg_page(&cmd->t_data_sg[i]));
3829 i--;
c66ac9db 3830 }
ec98f782
AG		 3831 kfree(cmd->t_data_sg);
3832 cmd->t_data_sg = NULL;
3833 return -ENOMEM;
c66ac9db
NB		 3834}
3835
a1d8b49a
AG		 3836/* Reduce sectors if they are too long for the device */
3837static inline sector_t transport_limit_task_sectors(
c66ac9db
NB		 3838 struct se_device *dev,
3839 unsigned long long lba,
a1d8b49a 3840 sector_t sectors)
c66ac9db 3841{
a1d8b49a 3842 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db 3843
a1d8b49a
AG		 3844 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3845 if ((lba + sectors) > transport_dev_end_lba(dev))
3846 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
c66ac9db 3847
a1d8b49a 3848 return sectors;
c66ac9db
NB		 3849}
3850
c66ac9db
NB		 3851
3852/*
3853 * This function can be used by HW target mode drivers to create a linked
3854 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3855 * This is intended to be called during the completion path by TCM Core
3856 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3857 */
3858void transport_do_task_sg_chain(struct se_cmd *cmd)
3859{
ec98f782
AG		 3860 struct scatterlist *sg_first = NULL;
3861 struct scatterlist *sg_prev = NULL;
3862 int sg_prev_nents = 0;
3863 struct scatterlist *sg;
c66ac9db 3864 struct se_task *task;
ec98f782 3865 u32 chained_nents = 0;
c66ac9db
NB		 3866 int i;
3867
ec98f782
AG		 3868 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3869
c66ac9db
NB		 3870 /*
3871 * Walk the struct se_task list and setup scatterlist chains
a1d8b49a 3872 * for each contiguously allocated struct se_task->task_sg[].
c66ac9db 3873 */
a1d8b49a 3874 list_for_each_entry(task, &cmd->t_task_list, t_list) {
ec98f782 3875 if (!task->task_sg)
c66ac9db
NB		 3876 continue;
3877
ec98f782
AG		 3878 if (!sg_first) {
3879 sg_first = task->task_sg;
6708bb27 3880 chained_nents = task->task_sg_nents;
97868c89 3881 } else {
ec98f782 3882 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
6708bb27 3883 chained_nents += task->task_sg_nents;
97868c89 3884 }
c3c74c7a
NB		 3885 /*
3886 * For the padded tasks, use the extra SGL vector allocated
3887 * in transport_allocate_data_tasks() for the sg_prev_nents
04629b7b
CH		 3888 * offset into sg_chain() above.
3889 *
3890 * We do not need the padding for the last task (or a single
3891 * task), but in that case we will never use the sg_prev_nents
3892 * value below which would be incorrect.
c3c74c7a 3893 */
04629b7b 3894 sg_prev_nents = (task->task_sg_nents + 1);
ec98f782 3895 sg_prev = task->task_sg;
c66ac9db
NB		 3896 }
3897 /*
3898 * Setup the starting pointer and total t_tasks_sg_linked_no including
3899 * padding SGs for linking and to mark the end.
3900 */
a1d8b49a 3901 cmd->t_tasks_sg_chained = sg_first;
ec98f782 3902 cmd->t_tasks_sg_chained_no = chained_nents;
c66ac9db 3903
6708bb27 3904 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
a1d8b49a
AG		 3905 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3906 cmd->t_tasks_sg_chained_no);
c66ac9db 3907
a1d8b49a
AG		 3908 for_each_sg(cmd->t_tasks_sg_chained, sg,
3909 cmd->t_tasks_sg_chained_no, i) {
c66ac9db 3910
6708bb27 3911 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
5951146d 3912 i, sg, sg_page(sg), sg->length, sg->offset);
c66ac9db 3913 if (sg_is_chain(sg))
6708bb27 3914 pr_debug("SG: %p sg_is_chain=1\n", sg);
c66ac9db 3915 if (sg_is_last(sg))
6708bb27 3916 pr_debug("SG: %p sg_is_last=1\n", sg);
c66ac9db 3917 }
c66ac9db
NB		 3918}
3919EXPORT_SYMBOL(transport_do_task_sg_chain);
3920
a1d8b49a
AG		 3921/*
3922 * Break up cmd into chunks transport can handle
3923 */
ec98f782 3924static int transport_allocate_data_tasks(
c66ac9db
NB		 3925 struct se_cmd *cmd,
3926 unsigned long long lba,
c66ac9db 3927 enum dma_data_direction data_direction,
ec98f782
AG		 3928 struct scatterlist *sgl,
3929 unsigned int sgl_nents)
c66ac9db 3930{
c66ac9db 3931 struct se_task *task;
5951146d 3932 struct se_device *dev = cmd->se_dev;
ec98f782 3933 unsigned long flags;
a3eedc22 3934 int task_count, i;
277c5f27 3935 sector_t sectors, dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
ec98f782
AG		 3936 u32 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
3937 struct scatterlist *sg;
3938 struct scatterlist *cmd_sg;
a1d8b49a 3939
ec98f782
AG		 3940 WARN_ON(cmd->data_length % sector_size);
3941 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
277c5f27
NB		 3942 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
3943
ec98f782
AG		 3944 cmd_sg = sgl;
3945 for (i = 0; i < task_count; i++) {
c3c74c7a 3946 unsigned int task_size, task_sg_nents_padded;
ec98f782 3947 int count;
a1d8b49a 3948
c66ac9db 3949 task = transport_generic_get_task(cmd, data_direction);
a1d8b49a 3950 if (!task)
ec98f782 3951 return -ENOMEM;
c66ac9db 3952
c66ac9db 3953 task->task_lba = lba;
ec98f782
AG		 3954 task->task_sectors = min(sectors, dev_max_sectors);
3955 task->task_size = task->task_sectors * sector_size;
c66ac9db 3956
525a48a2
NB		 3957 /*
3958 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3959 * in order to calculate the number per task SGL entries
3960 */
3961 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
c66ac9db 3962 /*
ec98f782
AG		 3963 * Check if the fabric module driver is requesting that all
3964 * struct se_task->task_sg[] be chained together.. If so,
3965 * then allocate an extra padding SG entry for linking and
c3c74c7a
NB		 3966 * marking the end of the chained SGL for every task except
3967 * the last one for (task_count > 1) operation, or skipping
3968 * the extra padding for the (task_count == 1) case.
c66ac9db 3969 */
c3c74c7a
NB		 3970 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3971 task_sg_nents_padded = (task->task_sg_nents + 1);
c3c74c7a
NB		 3972 } else
3973 task_sg_nents_padded = task->task_sg_nents;
c66ac9db 3974
1d20bb61 3975 task->task_sg = kmalloc(sizeof(struct scatterlist) *
c3c74c7a 3976 task_sg_nents_padded, GFP_KERNEL);
ec98f782
AG		 3977 if (!task->task_sg) {
3978 cmd->se_dev->transport->free_task(task);
3979 return -ENOMEM;
3980 }
3981
c3c74c7a 3982 sg_init_table(task->task_sg, task_sg_nents_padded);
c66ac9db 3983
ec98f782
AG		 3984 task_size = task->task_size;
3985
3986 /* Build new sgl, only up to task_size */
6708bb27 3987 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
ec98f782
AG		 3988 if (cmd_sg->length > task_size)
3989 break;
3990
3991 *sg = *cmd_sg;
3992 task_size -= cmd_sg->length;
3993 cmd_sg = sg_next(cmd_sg);
c66ac9db 3994 }
c66ac9db 3995
ec98f782
AG		 3996 lba += task->task_sectors;
3997 sectors -= task->task_sectors;
c66ac9db 3998
ec98f782
AG		 3999 spin_lock_irqsave(&cmd->t_state_lock, flags);
4000 list_add_tail(&task->t_list, &cmd->t_task_list);
4001 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4002 }
4003
ec98f782 4004 return task_count;
c66ac9db
NB		 4005}
4006
4007static int
ec98f782 4008transport_allocate_control_task(struct se_cmd *cmd)
c66ac9db 4009{
c66ac9db 4010 struct se_task *task;
ec98f782 4011 unsigned long flags;
c66ac9db
NB		 4012
4013 task = transport_generic_get_task(cmd, cmd->data_direction);
4014 if (!task)
ec98f782 4015 return -ENOMEM;
c66ac9db 4016
ec98f782
AG		 4017 task->task_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
4018 GFP_KERNEL);
4019 if (!task->task_sg) {
4020 cmd->se_dev->transport->free_task(task);
4021 return -ENOMEM;
4022 }
4023
4024 memcpy(task->task_sg, cmd->t_data_sg,
4025 sizeof(struct scatterlist) * cmd->t_data_nents);
c66ac9db 4026 task->task_size = cmd->data_length;
6708bb27 4027 task->task_sg_nents = cmd->t_data_nents;
c66ac9db 4028
ec98f782
AG		 4029 spin_lock_irqsave(&cmd->t_state_lock, flags);
4030 list_add_tail(&task->t_list, &cmd->t_task_list);
4031 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4032
6708bb27 4033 /* Success! Return number of tasks allocated */
a3eedc22 4034 return 1;
ec98f782
AG		 4035}
4036
4037static u32 transport_allocate_tasks(
4038 struct se_cmd *cmd,
4039 unsigned long long lba,
4040 enum dma_data_direction data_direction,
4041 struct scatterlist *sgl,
4042 unsigned int sgl_nents)
4043{
01cde4d5
NB		 4044 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
4045 if (transport_cmd_get_valid_sectors(cmd) < 0)
4046 return -EINVAL;
4047
ec98f782
AG		 4048 return transport_allocate_data_tasks(cmd, lba, data_direction,
4049 sgl, sgl_nents);
01cde4d5 4050 } else
6708bb27
AG		 4051 return transport_allocate_control_task(cmd);
4052
c66ac9db
NB		 4053}
4054
ec98f782 4055
c66ac9db
NB		 4056/* transport_generic_new_cmd(): Called from transport_processing_thread()
4057 *
4058 * Allocate storage transport resources from a set of values predefined
4059 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4060 * Any non zero return here is treated as an "out of resource' op here.
4061 */
4062 /*
4063 * Generate struct se_task(s) and/or their payloads for this CDB.
4064 */
a1d8b49a 4065int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 4066{
c66ac9db
NB		 4067 int ret = 0;
4068
4069 /*
4070 * Determine is the TCM fabric module has already allocated physical
4071 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 4072 * beforehand.
c66ac9db 4073 */
ec98f782
AG		 4074 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
4075 cmd->data_length) {
05d1c7c0 4076 ret = transport_generic_get_mem(cmd);
c66ac9db
NB		 4077 if (ret < 0)
4078 return ret;
4079 }
1d20bb61
NB		 4080 /*
4081 * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4082 * control or data CDB types, and perform the map to backend subsystem
4083 * code from SGL memory allocated here by transport_generic_get_mem(), or
4084 * via pre-existing SGL memory setup explictly by fabric module code with
4085 * transport_generic_map_mem_to_cmd().
4086 */
c66ac9db
NB		 4087 ret = transport_new_cmd_obj(cmd);
4088 if (ret < 0)
4089 return ret;
c66ac9db 4090 /*
a1d8b49a 4091 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 4092 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4093 * will be added to the struct se_device execution queue after its WRITE
4094 * data has arrived. (ie: It gets handled by the transport processing
4095 * thread a second time)
4096 */
4097 if (cmd->data_direction == DMA_TO_DEVICE) {
4098 transport_add_tasks_to_state_queue(cmd);
4099 return transport_generic_write_pending(cmd);
4100 }
4101 /*
4102 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4103 * to the execution queue.
4104 */
4105 transport_execute_tasks(cmd);
4106 return 0;
4107}
a1d8b49a 4108EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 4109
4110/* transport_generic_process_write():
4111 *
4112 *
4113 */
4114void transport_generic_process_write(struct se_cmd *cmd)
4115{
c66ac9db
NB		 4116 transport_execute_tasks(cmd);
4117}
4118EXPORT_SYMBOL(transport_generic_process_write);
4119
e057f533 4120static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 4121{
e057f533
CH		 4122 if (cmd->se_tfo->write_pending(cmd) == -EAGAIN) {
4123 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
4124 cmd);
4125 transport_handle_queue_full(cmd, cmd->se_dev);
4126 }
07bde79a
NB		 4127}
4128
c66ac9db
NB		 4129static int transport_generic_write_pending(struct se_cmd *cmd)
4130{
4131 unsigned long flags;
4132 int ret;
4133
a1d8b49a 4134 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4135 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 4136 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a 4137
c66ac9db
NB		 4138 /*
4139 * Clear the se_cmd for WRITE_PENDING status in order to set
a1d8b49a 4140 * cmd->t_transport_active=0 so that transport_generic_handle_data
c66ac9db 4141 * can be called from HW target mode interrupt code. This is safe
e3d6f909 4142 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 4143 * because the se_cmd->se_lun pointer is not being cleared.
4144 */
4145 transport_cmd_check_stop(cmd, 1, 0);
4146
4147 /*
4148 * Call the fabric write_pending function here to let the
4149 * frontend know that WRITE buffers are ready.
4150 */
e3d6f909 4151 ret = cmd->se_tfo->write_pending(cmd);
07bde79a
NB		 4152 if (ret == -EAGAIN)
4153 goto queue_full;
4154 else if (ret < 0)
c66ac9db
NB		 4155 return ret;
4156
4157 return PYX_TRANSPORT_WRITE_PENDING;
07bde79a
NB		 4158
4159queue_full:
6708bb27 4160 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a 4161 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
e057f533 4162 transport_handle_queue_full(cmd, cmd->se_dev);
07bde79a 4163 return ret;
c66ac9db
NB		 4164}
4165
2dbc43d2
CH		 4166/**
4167 * transport_release_cmd - free a command
4168 * @cmd: command to free
4169 *
4170 * This routine unconditionally frees a command, and reference counting
4171 * or list removal must be done in the caller.
4172 */
35462975 4173void transport_release_cmd(struct se_cmd *cmd)
c66ac9db 4174{
e3d6f909 4175 BUG_ON(!cmd->se_tfo);
c66ac9db 4176
2dbc43d2
CH		 4177 if (cmd->se_tmr_req)
4178 core_tmr_release_req(cmd->se_tmr_req);
4179 if (cmd->t_task_cdb != cmd->__t_task_cdb)
4180 kfree(cmd->t_task_cdb);
35462975 4181 cmd->se_tfo->release_cmd(cmd);
c66ac9db 4182}
35462975 4183EXPORT_SYMBOL(transport_release_cmd);
c66ac9db 4184
39c05f32 4185void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 4186{
d14921d6
NB		 4187 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
4188 if (wait_for_tasks && cmd->se_tmr_req)
4189 transport_wait_for_tasks(cmd);
4190
35462975 4191 transport_release_cmd(cmd);
d14921d6
NB		 4192 } else {
4193 if (wait_for_tasks)
4194 transport_wait_for_tasks(cmd);
4195
c66ac9db
NB		 4196 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
4197
82f1c8a4 4198 if (cmd->se_lun)
c66ac9db 4199 transport_lun_remove_cmd(cmd);
c66ac9db 4200
f4366772
NB		 4201 transport_free_dev_tasks(cmd);
4202
39c05f32 4203 transport_put_cmd(cmd);
c66ac9db
NB		 4204 }
4205}
4206EXPORT_SYMBOL(transport_generic_free_cmd);
4207
c66ac9db
NB		 4208/* transport_lun_wait_for_tasks():
4209 *
4210 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4211 * an struct se_lun to be successfully shutdown.
4212 */
4213static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4214{
4215 unsigned long flags;
4216 int ret;
4217 /*
4218 * If the frontend has already requested this struct se_cmd to
4219 * be stopped, we can safely ignore this struct se_cmd.
4220 */
a1d8b49a
AG		 4221 spin_lock_irqsave(&cmd->t_state_lock, flags);
4222 if (atomic_read(&cmd->t_transport_stop)) {
4223 atomic_set(&cmd->transport_lun_stop, 0);
6708bb27 4224 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
e3d6f909 4225 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4226 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4227 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 4228 return -EPERM;
c66ac9db 4229 }
a1d8b49a
AG		 4230 atomic_set(&cmd->transport_lun_fe_stop, 1);
4231 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4232
5951146d 4233 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 4234
4235 ret = transport_stop_tasks_for_cmd(cmd);
4236
6708bb27
AG		 4237 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4238 " %d\n", cmd, cmd->t_task_list_num, ret);
c66ac9db 4239 if (!ret) {
6708bb27 4240 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 4241 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4242 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 4243 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 4244 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4245 }
3df8d40b 4246 transport_remove_cmd_from_queue(cmd);
c66ac9db
NB		 4247
4248 return 0;
4249}
4250
c66ac9db
NB		 4251static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4252{
4253 struct se_cmd *cmd = NULL;
4254 unsigned long lun_flags, cmd_flags;
4255 /*
4256 * Do exception processing and return CHECK_CONDITION status to the
4257 * Initiator Port.
4258 */
4259 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 4260 while (!list_empty(&lun->lun_cmd_list)) {
4261 cmd = list_first_entry(&lun->lun_cmd_list,
4262 struct se_cmd, se_lun_node);
4263 list_del(&cmd->se_lun_node);
4264
a1d8b49a 4265 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db
NB		 4266 /*
4267 * This will notify iscsi_target_transport.c:
4268 * transport_cmd_check_stop() that a LUN shutdown is in
4269 * progress for the iscsi_cmd_t.
4270 */
a1d8b49a 4271 spin_lock(&cmd->t_state_lock);
6708bb27 4272 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 4273 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 4274 cmd->se_lun->unpacked_lun,
4275 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a
AG		 4276 atomic_set(&cmd->transport_lun_stop, 1);
4277 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 4278
4279 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4280
6708bb27
AG		 4281 if (!cmd->se_lun) {
4282 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 4283 cmd->se_tfo->get_task_tag(cmd),
4284 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 4285 BUG();
4286 }
4287 /*
4288 * If the Storage engine still owns the iscsi_cmd_t, determine
4289 * and/or stop its context.
4290 */
6708bb27 4291 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 4292 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4293 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4294
e3d6f909 4295 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 4296 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4297 continue;
4298 }
4299
6708bb27 4300 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 4301 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 4302 cmd->se_lun->unpacked_lun,
4303 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4304
a1d8b49a 4305 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
6708bb27 4306 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 4307 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4308 goto check_cond;
4309 }
a1d8b49a 4310 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 4311 transport_all_task_dev_remove_state(cmd);
a1d8b49a 4312 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4313
4314 transport_free_dev_tasks(cmd);
4315 /*
4316 * The Storage engine stopped this struct se_cmd before it was
4317 * send to the fabric frontend for delivery back to the
4318 * Initiator Node. Return this SCSI CDB back with an
4319 * CHECK_CONDITION status.
4320 */
4321check_cond:
4322 transport_send_check_condition_and_sense(cmd,
4323 TCM_NON_EXISTENT_LUN, 0);
4324 /*
4325 * If the fabric frontend is waiting for this iscsi_cmd_t to
4326 * be released, notify the waiting thread now that LU has
4327 * finished accessing it.
4328 */
a1d8b49a
AG		 4329 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4330 if (atomic_read(&cmd->transport_lun_fe_stop)) {
6708bb27 4331 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 4332 " struct se_cmd: %p ITT: 0x%08x\n",
4333 lun->unpacked_lun,
e3d6f909 4334 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4335
a1d8b49a 4336 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 4337 cmd_flags);
4338 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 4339 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 4340 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4341 continue;
4342 }
6708bb27 4343 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 4344 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4345
a1d8b49a 4346 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4347 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4348 }
4349 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4350}
4351
4352static int transport_clear_lun_thread(void *p)
4353{
4354 struct se_lun *lun = (struct se_lun *)p;
4355
4356 __transport_clear_lun_from_sessions(lun);
4357 complete(&lun->lun_shutdown_comp);
4358
4359 return 0;
4360}
4361
4362int transport_clear_lun_from_sessions(struct se_lun *lun)
4363{
4364 struct task_struct *kt;
4365
5951146d 4366 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 4367 "tcm_cl_%u", lun->unpacked_lun);
4368 if (IS_ERR(kt)) {
6708bb27 4369 pr_err("Unable to start clear_lun thread\n");
e3d6f909 4370 return PTR_ERR(kt);
c66ac9db
NB		 4371 }
4372 wait_for_completion(&lun->lun_shutdown_comp);
4373
4374 return 0;
4375}
4376
d14921d6
NB		 4377/**
4378 * transport_wait_for_tasks - wait for completion to occur
4379 * @cmd: command to wait
c66ac9db 4380 *
d14921d6
NB		 4381 * Called from frontend fabric context to wait for storage engine
4382 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 4383 */
d14921d6 4384void transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 4385{
4386 unsigned long flags;
4387
a1d8b49a 4388 spin_lock_irqsave(&cmd->t_state_lock, flags);
d14921d6
NB		 4389 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4390 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4391 return;
4392 }
4393 /*
4394 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4395 * has been set in transport_set_supported_SAM_opcode().
4396 */
4397 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4398 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4399 return;
4400 }
c66ac9db
NB		 4401 /*
4402 * If we are already stopped due to an external event (ie: LUN shutdown)
4403 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 4404 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 4405 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4406 * has completed its operation on the struct se_cmd.
4407 */
a1d8b49a 4408 if (atomic_read(&cmd->transport_lun_stop)) {
c66ac9db 4409
6708bb27 4410 pr_debug("wait_for_tasks: Stopping"
e3d6f909 4411 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 4412 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 4413 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4414 /*
4415 * There is a special case for WRITES where a FE exception +
4416 * LUN shutdown means ConfigFS context is still sleeping on
4417 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4418 * We go ahead and up transport_lun_stop_comp just to be sure
4419 * here.
4420 */
a1d8b49a
AG		 4421 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4422 complete(&cmd->transport_lun_stop_comp);
4423 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4424 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4425
4426 transport_all_task_dev_remove_state(cmd);
4427 /*
4428 * At this point, the frontend who was the originator of this
4429 * struct se_cmd, now owns the structure and can be released through
4430 * normal means below.
4431 */
6708bb27 4432 pr_debug("wait_for_tasks: Stopped"
e3d6f909 4433 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 4434 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 4435 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4436
a1d8b49a 4437 atomic_set(&cmd->transport_lun_stop, 0);
c66ac9db 4438 }
a1d8b49a 4439 if (!atomic_read(&cmd->t_transport_active) ||
d14921d6
NB		 4440 atomic_read(&cmd->t_transport_aborted)) {
4441 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4442 return;
4443 }
c66ac9db 4444
a1d8b49a 4445 atomic_set(&cmd->t_transport_stop, 1);
c66ac9db 4446
6708bb27 4447 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
c66ac9db 4448 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
e3d6f909
AG		 4449 " = TRUE\n", cmd, cmd->se_tfo->get_task_tag(cmd),
4450 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
c66ac9db
NB		 4451 cmd->deferred_t_state);
4452
a1d8b49a 4453 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4454
5951146d 4455 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 4456
a1d8b49a 4457 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 4458
a1d8b49a
AG		 4459 spin_lock_irqsave(&cmd->t_state_lock, flags);
4460 atomic_set(&cmd->t_transport_active, 0);
4461 atomic_set(&cmd->t_transport_stop, 0);
c66ac9db 4462
6708bb27 4463 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4464 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4465 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4466
d14921d6 4467 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4468}
d14921d6 4469EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 4470
4471static int transport_get_sense_codes(
4472 struct se_cmd *cmd,
4473 u8 *asc,
4474 u8 *ascq)
4475{
4476 *asc = cmd->scsi_asc;
4477 *ascq = cmd->scsi_ascq;
4478
4479 return 0;
4480}
4481
4482static int transport_set_sense_codes(
4483 struct se_cmd *cmd,
4484 u8 asc,
4485 u8 ascq)
4486{
4487 cmd->scsi_asc = asc;
4488 cmd->scsi_ascq = ascq;
4489
4490 return 0;
4491}
4492
4493int transport_send_check_condition_and_sense(
4494 struct se_cmd *cmd,
4495 u8 reason,
4496 int from_transport)
4497{
4498 unsigned char *buffer = cmd->sense_buffer;
4499 unsigned long flags;
4500 int offset;
4501 u8 asc = 0, ascq = 0;
4502
a1d8b49a 4503 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4504 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4505 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4506 return 0;
4507 }
4508 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4509 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4510
4511 if (!reason && from_transport)
4512 goto after_reason;
4513
4514 if (!from_transport)
4515 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4516 /*
4517 * Data Segment and SenseLength of the fabric response PDU.
4518 *
4519 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4520 * from include/scsi/scsi_cmnd.h
4521 */
e3d6f909 4522 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4523 TRANSPORT_SENSE_BUFFER);
4524 /*
4525 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4526 * SENSE KEY values from include/scsi/scsi.h
4527 */
4528 switch (reason) {
4529 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4530 /* CURRENT ERROR */
4531 buffer[offset] = 0x70;
4532 /* ILLEGAL REQUEST */
4533 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4534 /* LOGICAL UNIT NOT SUPPORTED */
4535 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4536 break;
c66ac9db
NB		 4537 case TCM_UNSUPPORTED_SCSI_OPCODE:
4538 case TCM_SECTOR_COUNT_TOO_MANY:
4539 /* CURRENT ERROR */
4540 buffer[offset] = 0x70;
4541 /* ILLEGAL REQUEST */
4542 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4543 /* INVALID COMMAND OPERATION CODE */
4544 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4545 break;
4546 case TCM_UNKNOWN_MODE_PAGE:
4547 /* CURRENT ERROR */
4548 buffer[offset] = 0x70;
4549 /* ILLEGAL REQUEST */
4550 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4551 /* INVALID FIELD IN CDB */
4552 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4553 break;
4554 case TCM_CHECK_CONDITION_ABORT_CMD:
4555 /* CURRENT ERROR */
4556 buffer[offset] = 0x70;
4557 /* ABORTED COMMAND */
4558 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4559 /* BUS DEVICE RESET FUNCTION OCCURRED */
4560 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4561 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4562 break;
4563 case TCM_INCORRECT_AMOUNT_OF_DATA:
4564 /* CURRENT ERROR */
4565 buffer[offset] = 0x70;
4566 /* ABORTED COMMAND */
4567 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4568 /* WRITE ERROR */
4569 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4570 /* NOT ENOUGH UNSOLICITED DATA */
4571 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4572 break;
4573 case TCM_INVALID_CDB_FIELD:
4574 /* CURRENT ERROR */
4575 buffer[offset] = 0x70;
4576 /* ABORTED COMMAND */
4577 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4578 /* INVALID FIELD IN CDB */
4579 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4580 break;
4581 case TCM_INVALID_PARAMETER_LIST:
4582 /* CURRENT ERROR */
4583 buffer[offset] = 0x70;
4584 /* ABORTED COMMAND */
4585 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4586 /* INVALID FIELD IN PARAMETER LIST */
4587 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4588 break;
4589 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4590 /* CURRENT ERROR */
4591 buffer[offset] = 0x70;
4592 /* ABORTED COMMAND */
4593 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4594 /* WRITE ERROR */
4595 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4596 /* UNEXPECTED_UNSOLICITED_DATA */
4597 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4598 break;
4599 case TCM_SERVICE_CRC_ERROR:
4600 /* CURRENT ERROR */
4601 buffer[offset] = 0x70;
4602 /* ABORTED COMMAND */
4603 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4604 /* PROTOCOL SERVICE CRC ERROR */
4605 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4606 /* N/A */
4607 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4608 break;
4609 case TCM_SNACK_REJECTED:
4610 /* CURRENT ERROR */
4611 buffer[offset] = 0x70;
4612 /* ABORTED COMMAND */
4613 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4614 /* READ ERROR */
4615 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4616 /* FAILED RETRANSMISSION REQUEST */
4617 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4618 break;
4619 case TCM_WRITE_PROTECTED:
4620 /* CURRENT ERROR */
4621 buffer[offset] = 0x70;
4622 /* DATA PROTECT */
4623 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4624 /* WRITE PROTECTED */
4625 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4626 break;
4627 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4628 /* CURRENT ERROR */
4629 buffer[offset] = 0x70;
4630 /* UNIT ATTENTION */
4631 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4632 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4633 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4634 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4635 break;
4636 case TCM_CHECK_CONDITION_NOT_READY:
4637 /* CURRENT ERROR */
4638 buffer[offset] = 0x70;
4639 /* Not Ready */
4640 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4641 transport_get_sense_codes(cmd, &asc, &ascq);
4642 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4643 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4644 break;
4645 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4646 default:
4647 /* CURRENT ERROR */
4648 buffer[offset] = 0x70;
4649 /* ILLEGAL REQUEST */
4650 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4651 /* LOGICAL UNIT COMMUNICATION FAILURE */
4652 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4653 break;
4654 }
4655 /*
4656 * This code uses linux/include/scsi/scsi.h SAM status codes!
4657 */
4658 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4659 /*
4660 * Automatically padded, this value is encoded in the fabric's
4661 * data_length response PDU containing the SCSI defined sense data.
4662 */
4663 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4664
4665after_reason:
07bde79a 4666 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4667}
4668EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4669
4670int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4671{
4672 int ret = 0;
4673
a1d8b49a 4674 if (atomic_read(&cmd->t_transport_aborted) != 0) {
6708bb27 4675 if (!send_status ||
c66ac9db
NB		 4676 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4677 return 1;
4678#if 0
6708bb27 4679 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4680 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4681 cmd->t_task_cdb[0],
e3d6f909 4682 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4683#endif
4684 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4685 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4686 ret = 1;
4687 }
4688 return ret;
4689}
4690EXPORT_SYMBOL(transport_check_aborted_status);
4691
4692void transport_send_task_abort(struct se_cmd *cmd)
4693{
c252f003
NB		 4694 unsigned long flags;
4695
4696 spin_lock_irqsave(&cmd->t_state_lock, flags);
4697 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4698 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4699 return;
4700 }
4701 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4702
c66ac9db
NB		 4703 /*
4704 * If there are still expected incoming fabric WRITEs, we wait
4705 * until until they have completed before sending a TASK_ABORTED
4706 * response. This response with TASK_ABORTED status will be
4707 * queued back to fabric module by transport_check_aborted_status().
4708 */
4709 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4710 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
a1d8b49a 4711 atomic_inc(&cmd->t_transport_aborted);
c66ac9db
NB		 4712 smp_mb__after_atomic_inc();
4713 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4714 transport_new_cmd_failure(cmd);
4715 return;
4716 }
4717 }
4718 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4719#if 0
6708bb27 4720 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4721 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4722 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4723#endif
e3d6f909 4724 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4725}
4726
4727/* transport_generic_do_tmr():
4728 *
4729 *
4730 */
4731int transport_generic_do_tmr(struct se_cmd *cmd)
4732{
5951146d 4733 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4734 struct se_tmr_req *tmr = cmd->se_tmr_req;
4735 int ret;
4736
4737 switch (tmr->function) {
5c6cd613 4738 case TMR_ABORT_TASK:
c66ac9db
NB		 4739 tmr->response = TMR_FUNCTION_REJECTED;
4740 break;
5c6cd613
NB		 4741 case TMR_ABORT_TASK_SET:
4742 case TMR_CLEAR_ACA:
4743 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4744 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4745 break;
5c6cd613 4746 case TMR_LUN_RESET:
c66ac9db
NB		 4747 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4748 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4749 TMR_FUNCTION_REJECTED;
4750 break;
5c6cd613 4751 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4752 tmr->response = TMR_FUNCTION_REJECTED;
4753 break;
5c6cd613 4754 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4755 tmr->response = TMR_FUNCTION_REJECTED;
4756 break;
c66ac9db 4757 default:
6708bb27 4758 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4759 tmr->function);
4760 tmr->response = TMR_FUNCTION_REJECTED;
4761 break;
4762 }
4763
4764 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4765 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 4766
b7b8bef7 4767 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 4768 return 0;
4769}
4770
c66ac9db
NB		 4771/* transport_processing_thread():
4772 *
4773 *
4774 */
4775static int transport_processing_thread(void *param)
4776{
5951146d 4777 int ret;
c66ac9db
NB		 4778 struct se_cmd *cmd;
4779 struct se_device *dev = (struct se_device *) param;
c66ac9db
NB		 4780
4781 set_user_nice(current, -20);
4782
4783 while (!kthread_should_stop()) {
e3d6f909
AG		 4784 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4785 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 4786 kthread_should_stop());
4787 if (ret < 0)
4788 goto out;
4789
c66ac9db
NB		 4790get_cmd:
4791 __transport_execute_tasks(dev);
4792
5951146d
AG		 4793 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4794 if (!cmd)
c66ac9db
NB		 4795 continue;
4796
5951146d 4797 switch (cmd->t_state) {
680b73c5
CH		 4798 case TRANSPORT_NEW_CMD:
4799 BUG();
4800 break;
c66ac9db 4801 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 4802 if (!cmd->se_tfo->new_cmd_map) {
4803 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 4804 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4805 BUG();
4806 }
e3d6f909 4807 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db
NB		 4808 if (ret < 0) {
4809 cmd->transport_error_status = ret;
4810 transport_generic_request_failure(cmd, NULL,
4811 0, (cmd->data_direction !=
4812 DMA_TO_DEVICE));
4813 break;
4814 }
c66ac9db 4815 ret = transport_generic_new_cmd(cmd);
07bde79a
NB		 4816 if (ret == -EAGAIN)
4817 break;
4818 else if (ret < 0) {
c66ac9db
NB		 4819 cmd->transport_error_status = ret;
4820 transport_generic_request_failure(cmd, NULL,
4821 0, (cmd->data_direction !=
4822 DMA_TO_DEVICE));
4823 }
4824 break;
4825 case TRANSPORT_PROCESS_WRITE:
4826 transport_generic_process_write(cmd);
4827 break;
4828 case TRANSPORT_COMPLETE_OK:
4829 transport_stop_all_task_timers(cmd);
4830 transport_generic_complete_ok(cmd);
4831 break;
4832 case TRANSPORT_REMOVE:
e6a2573f 4833 transport_put_cmd(cmd);
c66ac9db 4834 break;
f4366772 4835 case TRANSPORT_FREE_CMD_INTR:
82f1c8a4 4836 transport_generic_free_cmd(cmd, 0);
f4366772 4837 break;
c66ac9db
NB		 4838 case TRANSPORT_PROCESS_TMR:
4839 transport_generic_do_tmr(cmd);
4840 break;
4841 case TRANSPORT_COMPLETE_FAILURE:
4842 transport_generic_request_failure(cmd, NULL, 1, 1);
4843 break;
4844 case TRANSPORT_COMPLETE_TIMEOUT:
4845 transport_stop_all_task_timers(cmd);
4846 transport_generic_request_timeout(cmd);
4847 break;
07bde79a 4848 case TRANSPORT_COMPLETE_QF_WP:
e057f533
CH		 4849 transport_write_pending_qf(cmd);
4850 break;
4851 case TRANSPORT_COMPLETE_QF_OK:
4852 transport_complete_qf(cmd);
07bde79a 4853 break;
c66ac9db 4854 default:
6708bb27 4855 pr_err("Unknown t_state: %d deferred_t_state:"
c66ac9db 4856 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
5951146d 4857 " %u\n", cmd->t_state, cmd->deferred_t_state,
e3d6f909
AG		 4858 cmd->se_tfo->get_task_tag(cmd),
4859 cmd->se_tfo->get_cmd_state(cmd),
4860 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 4861 BUG();
4862 }
4863
4864 goto get_cmd;
4865 }
4866
4867out:
ce8762f6
NB		 4868 WARN_ON(!list_empty(&dev->state_task_list));
4869 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
c66ac9db
NB		 4870 dev->process_thread = NULL;
4871 return 0;
4872}
Linux kernel - Deliverables
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