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target: Remove legacy se_task->task_timer and associated logic
[linux-2.6-block.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 *
27 ******************************************************************************/
28
c66ac9db
NB		 29#include <linux/net.h>
30#include <linux/delay.h>
31#include <linux/string.h>
32#include <linux/timer.h>
33#include <linux/slab.h>
34#include <linux/blkdev.h>
35#include <linux/spinlock.h>
c66ac9db
NB		 36#include <linux/kthread.h>
37#include <linux/in.h>
38#include <linux/cdrom.h>
39#include <asm/unaligned.h>
40#include <net/sock.h>
41#include <net/tcp.h>
42#include <scsi/scsi.h>
43#include <scsi/scsi_cmnd.h>
e66ecd50 44#include <scsi/scsi_tcq.h>
c66ac9db
NB		 45
46#include <target/target_core_base.h>
47#include <target/target_core_device.h>
48#include <target/target_core_tmr.h>
49#include <target/target_core_tpg.h>
50#include <target/target_core_transport.h>
51#include <target/target_core_fabric_ops.h>
52#include <target/target_core_configfs.h>
53
54#include "target_core_alua.h"
55#include "target_core_hba.h"
56#include "target_core_pr.h"
c66ac9db
NB		 57#include "target_core_ua.h"
58
e3d6f909 59static int sub_api_initialized;
c66ac9db 60
35e0e757 61static struct workqueue_struct *target_completion_wq;
c66ac9db
NB		 62static struct kmem_cache *se_cmd_cache;
63static struct kmem_cache *se_sess_cache;
64struct kmem_cache *se_tmr_req_cache;
65struct kmem_cache *se_ua_cache;
c66ac9db
NB		 66struct kmem_cache *t10_pr_reg_cache;
67struct kmem_cache *t10_alua_lu_gp_cache;
68struct kmem_cache *t10_alua_lu_gp_mem_cache;
69struct kmem_cache *t10_alua_tg_pt_gp_cache;
70struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
71
c66ac9db 72static int transport_generic_write_pending(struct se_cmd *);
5951146d 73static int transport_processing_thread(void *param);
c66ac9db
NB		 74static int __transport_execute_tasks(struct se_device *dev);
75static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 76static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 77 struct se_device *dev);
c66ac9db 78static void transport_free_dev_tasks(struct se_cmd *cmd);
05d1c7c0 79static int transport_generic_get_mem(struct se_cmd *cmd);
39c05f32 80static void transport_put_cmd(struct se_cmd *cmd);
3df8d40b 81static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
c66ac9db 82static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
35e0e757
CH		 83static void transport_generic_request_failure(struct se_cmd *, int, int);
84static void target_complete_ok_work(struct work_struct *work);
c66ac9db 85
e3d6f909 86int init_se_kmem_caches(void)
c66ac9db 87{
c66ac9db
NB		 88 se_cmd_cache = kmem_cache_create("se_cmd_cache",
89 sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
6708bb27
AG		 90 if (!se_cmd_cache) {
91 pr_err("kmem_cache_create for struct se_cmd failed\n");
c66ac9db
NB		 92 goto out;
93 }
94 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
95 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
96 0, NULL);
6708bb27
AG		 97 if (!se_tmr_req_cache) {
98 pr_err("kmem_cache_create() for struct se_tmr_req"
c66ac9db 99 " failed\n");
35e0e757 100 goto out_free_cmd_cache;
c66ac9db
NB		 101 }
102 se_sess_cache = kmem_cache_create("se_sess_cache",
103 sizeof(struct se_session), __alignof__(struct se_session),
104 0, NULL);
6708bb27
AG		 105 if (!se_sess_cache) {
106 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 107 " failed\n");
35e0e757 108 goto out_free_tmr_req_cache;
c66ac9db
NB		 109 }
110 se_ua_cache = kmem_cache_create("se_ua_cache",
111 sizeof(struct se_ua), __alignof__(struct se_ua),
112 0, NULL);
6708bb27
AG		 113 if (!se_ua_cache) {
114 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 115 goto out_free_sess_cache;
c66ac9db 116 }
c66ac9db
NB		 117 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
118 sizeof(struct t10_pr_registration),
119 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 120 if (!t10_pr_reg_cache) {
121 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 122 " failed\n");
35e0e757 123 goto out_free_ua_cache;
c66ac9db
NB		 124 }
125 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
126 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
127 0, NULL);
6708bb27
AG		 128 if (!t10_alua_lu_gp_cache) {
129 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 130 " failed\n");
35e0e757 131 goto out_free_pr_reg_cache;
c66ac9db
NB		 132 }
133 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
134 sizeof(struct t10_alua_lu_gp_member),
135 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 136 if (!t10_alua_lu_gp_mem_cache) {
137 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 138 "cache failed\n");
35e0e757 139 goto out_free_lu_gp_cache;
c66ac9db
NB		 140 }
141 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
142 sizeof(struct t10_alua_tg_pt_gp),
143 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 144 if (!t10_alua_tg_pt_gp_cache) {
145 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 146 "cache failed\n");
35e0e757 147 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 148 }
149 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
150 "t10_alua_tg_pt_gp_mem_cache",
151 sizeof(struct t10_alua_tg_pt_gp_member),
152 __alignof__(struct t10_alua_tg_pt_gp_member),
153 0, NULL);
6708bb27
AG		 154 if (!t10_alua_tg_pt_gp_mem_cache) {
155 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 156 "mem_t failed\n");
35e0e757 157 goto out_free_tg_pt_gp_cache;
c66ac9db
NB		 158 }
159
35e0e757
CH		 160 target_completion_wq = alloc_workqueue("target_completion",
161 WQ_MEM_RECLAIM, 0);
162 if (!target_completion_wq)
163 goto out_free_tg_pt_gp_mem_cache;
164
c66ac9db 165 return 0;
35e0e757
CH		 166
167out_free_tg_pt_gp_mem_cache:
168 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
169out_free_tg_pt_gp_cache:
170 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
171out_free_lu_gp_mem_cache:
172 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
173out_free_lu_gp_cache:
174 kmem_cache_destroy(t10_alua_lu_gp_cache);
175out_free_pr_reg_cache:
176 kmem_cache_destroy(t10_pr_reg_cache);
177out_free_ua_cache:
178 kmem_cache_destroy(se_ua_cache);
179out_free_sess_cache:
180 kmem_cache_destroy(se_sess_cache);
181out_free_tmr_req_cache:
182 kmem_cache_destroy(se_tmr_req_cache);
183out_free_cmd_cache:
184 kmem_cache_destroy(se_cmd_cache);
c66ac9db 185out:
e3d6f909 186 return -ENOMEM;
c66ac9db
NB		 187}
188
e3d6f909 189void release_se_kmem_caches(void)
c66ac9db 190{
35e0e757 191 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 192 kmem_cache_destroy(se_cmd_cache);
193 kmem_cache_destroy(se_tmr_req_cache);
194 kmem_cache_destroy(se_sess_cache);
195 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 196 kmem_cache_destroy(t10_pr_reg_cache);
197 kmem_cache_destroy(t10_alua_lu_gp_cache);
198 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
199 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
200 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 201}
202
e3d6f909
AG		 203/* This code ensures unique mib indexes are handed out. */
204static DEFINE_SPINLOCK(scsi_mib_index_lock);
205static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 206
207/*
208 * Allocate a new row index for the entry type specified
209 */
210u32 scsi_get_new_index(scsi_index_t type)
211{
212 u32 new_index;
213
e3d6f909 214 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 215
e3d6f909
AG		 216 spin_lock(&scsi_mib_index_lock);
217 new_index = ++scsi_mib_index[type];
218 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 219
220 return new_index;
221}
222
c66ac9db
NB		 223void transport_init_queue_obj(struct se_queue_obj *qobj)
224{
225 atomic_set(&qobj->queue_cnt, 0);
226 INIT_LIST_HEAD(&qobj->qobj_list);
227 init_waitqueue_head(&qobj->thread_wq);
228 spin_lock_init(&qobj->cmd_queue_lock);
229}
230EXPORT_SYMBOL(transport_init_queue_obj);
231
dbc5623e 232void transport_subsystem_check_init(void)
c66ac9db
NB		 233{
234 int ret;
235
dbc5623e
NB		 236 if (sub_api_initialized)
237 return;
238
c66ac9db
NB		 239 ret = request_module("target_core_iblock");
240 if (ret != 0)
6708bb27 241 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 242
243 ret = request_module("target_core_file");
244 if (ret != 0)
6708bb27 245 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 246
247 ret = request_module("target_core_pscsi");
248 if (ret != 0)
6708bb27 249 pr_err("Unable to load target_core_pscsi\n");
c66ac9db
NB		 250
251 ret = request_module("target_core_stgt");
252 if (ret != 0)
6708bb27 253 pr_err("Unable to load target_core_stgt\n");
c66ac9db 254
e3d6f909 255 sub_api_initialized = 1;
dbc5623e 256 return;
c66ac9db
NB		 257}
258
259struct se_session *transport_init_session(void)
260{
261 struct se_session *se_sess;
262
263 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 264 if (!se_sess) {
265 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 266 " se_sess_cache\n");
267 return ERR_PTR(-ENOMEM);
268 }
269 INIT_LIST_HEAD(&se_sess->sess_list);
270 INIT_LIST_HEAD(&se_sess->sess_acl_list);
c66ac9db
NB		 271
272 return se_sess;
273}
274EXPORT_SYMBOL(transport_init_session);
275
276/*
277 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
278 */
279void __transport_register_session(
280 struct se_portal_group *se_tpg,
281 struct se_node_acl *se_nacl,
282 struct se_session *se_sess,
283 void *fabric_sess_ptr)
284{
285 unsigned char buf[PR_REG_ISID_LEN];
286
287 se_sess->se_tpg = se_tpg;
288 se_sess->fabric_sess_ptr = fabric_sess_ptr;
289 /*
290 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
291 *
292 * Only set for struct se_session's that will actually be moving I/O.
293 * eg: *NOT* discovery sessions.
294 */
295 if (se_nacl) {
296 /*
297 * If the fabric module supports an ISID based TransportID,
298 * save this value in binary from the fabric I_T Nexus now.
299 */
e3d6f909 300 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 301 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 302 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 303 &buf[0], PR_REG_ISID_LEN);
304 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
305 }
306 spin_lock_irq(&se_nacl->nacl_sess_lock);
307 /*
308 * The se_nacl->nacl_sess pointer will be set to the
309 * last active I_T Nexus for each struct se_node_acl.
310 */
311 se_nacl->nacl_sess = se_sess;
312
313 list_add_tail(&se_sess->sess_acl_list,
314 &se_nacl->acl_sess_list);
315 spin_unlock_irq(&se_nacl->nacl_sess_lock);
316 }
317 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
318
6708bb27 319 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 320 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 321}
322EXPORT_SYMBOL(__transport_register_session);
323
324void transport_register_session(
325 struct se_portal_group *se_tpg,
326 struct se_node_acl *se_nacl,
327 struct se_session *se_sess,
328 void *fabric_sess_ptr)
329{
330 spin_lock_bh(&se_tpg->session_lock);
331 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
332 spin_unlock_bh(&se_tpg->session_lock);
333}
334EXPORT_SYMBOL(transport_register_session);
335
336void transport_deregister_session_configfs(struct se_session *se_sess)
337{
338 struct se_node_acl *se_nacl;
23388864 339 unsigned long flags;
c66ac9db
NB		 340 /*
341 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
342 */
343 se_nacl = se_sess->se_node_acl;
6708bb27 344 if (se_nacl) {
23388864 345 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 346 list_del(&se_sess->sess_acl_list);
347 /*
348 * If the session list is empty, then clear the pointer.
349 * Otherwise, set the struct se_session pointer from the tail
350 * element of the per struct se_node_acl active session list.
351 */
352 if (list_empty(&se_nacl->acl_sess_list))
353 se_nacl->nacl_sess = NULL;
354 else {
355 se_nacl->nacl_sess = container_of(
356 se_nacl->acl_sess_list.prev,
357 struct se_session, sess_acl_list);
358 }
23388864 359 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 360 }
361}
362EXPORT_SYMBOL(transport_deregister_session_configfs);
363
364void transport_free_session(struct se_session *se_sess)
365{
366 kmem_cache_free(se_sess_cache, se_sess);
367}
368EXPORT_SYMBOL(transport_free_session);
369
370void transport_deregister_session(struct se_session *se_sess)
371{
372 struct se_portal_group *se_tpg = se_sess->se_tpg;
373 struct se_node_acl *se_nacl;
e63a8e19 374 unsigned long flags;
c66ac9db 375
6708bb27 376 if (!se_tpg) {
c66ac9db
NB		 377 transport_free_session(se_sess);
378 return;
379 }
c66ac9db 380
e63a8e19 381 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 382 list_del(&se_sess->sess_list);
383 se_sess->se_tpg = NULL;
384 se_sess->fabric_sess_ptr = NULL;
e63a8e19 385 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 386
387 /*
388 * Determine if we need to do extra work for this initiator node's
389 * struct se_node_acl if it had been previously dynamically generated.
390 */
391 se_nacl = se_sess->se_node_acl;
6708bb27 392 if (se_nacl) {
e63a8e19 393 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 394 if (se_nacl->dynamic_node_acl) {
6708bb27
AG		 395 if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
396 se_tpg)) {
c66ac9db
NB		 397 list_del(&se_nacl->acl_list);
398 se_tpg->num_node_acls--;
e63a8e19 399 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 400
401 core_tpg_wait_for_nacl_pr_ref(se_nacl);
c66ac9db 402 core_free_device_list_for_node(se_nacl, se_tpg);
e3d6f909 403 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
c66ac9db 404 se_nacl);
e63a8e19 405 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 406 }
407 }
e63a8e19 408 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 409 }
410
411 transport_free_session(se_sess);
412
6708bb27 413 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 414 se_tpg->se_tpg_tfo->get_fabric_name());
c66ac9db
NB		 415}
416EXPORT_SYMBOL(transport_deregister_session);
417
418/*
a1d8b49a 419 * Called with cmd->t_state_lock held.
c66ac9db
NB		 420 */
421static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
422{
42bf829e 423 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 424 struct se_task *task;
425 unsigned long flags;
426
42bf829e
CH		 427 if (!dev)
428 return;
c66ac9db 429
42bf829e 430 list_for_each_entry(task, &cmd->t_task_list, t_list) {
6c76bf95 431 if (task->task_flags & TF_ACTIVE)
c66ac9db
NB		 432 continue;
433
6708bb27 434 if (!atomic_read(&task->task_state_active))
c66ac9db
NB		 435 continue;
436
437 spin_lock_irqsave(&dev->execute_task_lock, flags);
438 list_del(&task->t_state_list);
6708bb27
AG		 439 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
440 cmd->se_tfo->get_task_tag(cmd), dev, task);
c66ac9db
NB		 441 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
442
443 atomic_set(&task->task_state_active, 0);
a1d8b49a 444 atomic_dec(&cmd->t_task_cdbs_ex_left);
c66ac9db
NB		 445 }
446}
447
448/* transport_cmd_check_stop():
449 *
450 * 'transport_off = 1' determines if t_transport_active should be cleared.
451 * 'transport_off = 2' determines if task_dev_state should be removed.
452 *
453 * A non-zero u8 t_state sets cmd->t_state.
454 * Returns 1 when command is stopped, else 0.
455 */
456static int transport_cmd_check_stop(
457 struct se_cmd *cmd,
458 int transport_off,
459 u8 t_state)
460{
461 unsigned long flags;
462
a1d8b49a 463 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 464 /*
465 * Determine if IOCTL context caller in requesting the stopping of this
466 * command for LUN shutdown purposes.
467 */
a1d8b49a 468 if (atomic_read(&cmd->transport_lun_stop)) {
6708bb27 469 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
c66ac9db 470 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 471 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 472
a1d8b49a 473 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 474 if (transport_off == 2)
475 transport_all_task_dev_remove_state(cmd);
a1d8b49a 476 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 477
a1d8b49a 478 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 479 return 1;
480 }
481 /*
482 * Determine if frontend context caller is requesting the stopping of
e3d6f909 483 * this command for frontend exceptions.
c66ac9db 484 */
a1d8b49a 485 if (atomic_read(&cmd->t_transport_stop)) {
6708bb27 486 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
c66ac9db 487 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 488 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 489
c66ac9db
NB		 490 if (transport_off == 2)
491 transport_all_task_dev_remove_state(cmd);
492
493 /*
494 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
495 * to FE.
496 */
497 if (transport_off == 2)
498 cmd->se_lun = NULL;
a1d8b49a 499 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 500
a1d8b49a 501 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 502 return 1;
503 }
504 if (transport_off) {
a1d8b49a 505 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 506 if (transport_off == 2) {
507 transport_all_task_dev_remove_state(cmd);
508 /*
509 * Clear struct se_cmd->se_lun before the transport_off == 2
510 * handoff to fabric module.
511 */
512 cmd->se_lun = NULL;
513 /*
514 * Some fabric modules like tcm_loop can release
25985edc 515 * their internally allocated I/O reference now and
c66ac9db
NB		 516 * struct se_cmd now.
517 */
e3d6f909 518 if (cmd->se_tfo->check_stop_free != NULL) {
c66ac9db 519 spin_unlock_irqrestore(
a1d8b49a 520 &cmd->t_state_lock, flags);
c66ac9db 521
e3d6f909 522 cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 523 return 1;
524 }
525 }
a1d8b49a 526 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 527
528 return 0;
529 } else if (t_state)
530 cmd->t_state = t_state;
a1d8b49a 531 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 532
533 return 0;
534}
535
536static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
537{
538 return transport_cmd_check_stop(cmd, 2, 0);
539}
540
541static void transport_lun_remove_cmd(struct se_cmd *cmd)
542{
e3d6f909 543 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 544 unsigned long flags;
545
546 if (!lun)
547 return;
548
a1d8b49a 549 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 550 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 551 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 552 goto check_lun;
553 }
a1d8b49a 554 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 555 transport_all_task_dev_remove_state(cmd);
a1d8b49a 556 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 557
c66ac9db
NB		 558
559check_lun:
560 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
a1d8b49a 561 if (atomic_read(&cmd->transport_lun_active)) {
5951146d 562 list_del(&cmd->se_lun_node);
a1d8b49a 563 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db 564#if 0
6708bb27 565 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
e3d6f909 566 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
c66ac9db
NB		 567#endif
568 }
569 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
570}
571
572void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
573{
8dc52b54
NB		 574 if (!cmd->se_tmr_req)
575 transport_lun_remove_cmd(cmd);
c66ac9db
NB		 576
577 if (transport_cmd_check_stop_to_fabric(cmd))
578 return;
77039d1e 579 if (remove) {
3df8d40b 580 transport_remove_cmd_from_queue(cmd);
e6a2573f 581 transport_put_cmd(cmd);
77039d1e 582 }
c66ac9db
NB		 583}
584
f7a5cc0b
CH		 585static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
586 bool at_head)
c66ac9db
NB		 587{
588 struct se_device *dev = cmd->se_dev;
e3d6f909 589 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 590 unsigned long flags;
591
c66ac9db 592 if (t_state) {
a1d8b49a 593 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 594 cmd->t_state = t_state;
a1d8b49a
AG		 595 atomic_set(&cmd->t_transport_active, 1);
596 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 597 }
598
599 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
79a7fef2
RD		 600
601 /* If the cmd is already on the list, remove it before we add it */
602 if (!list_empty(&cmd->se_queue_node))
603 list_del(&cmd->se_queue_node);
604 else
605 atomic_inc(&qobj->queue_cnt);
606
f7a5cc0b 607 if (at_head)
07bde79a 608 list_add(&cmd->se_queue_node, &qobj->qobj_list);
f7a5cc0b 609 else
07bde79a 610 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
79a7fef2 611 atomic_set(&cmd->t_transport_queue_active, 1);
c66ac9db
NB		 612 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
613
c66ac9db 614 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 615}
616
5951146d
AG		 617static struct se_cmd *
618transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 619{
5951146d 620 struct se_cmd *cmd;
c66ac9db
NB		 621 unsigned long flags;
622
623 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
624 if (list_empty(&qobj->qobj_list)) {
625 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
626 return NULL;
627 }
5951146d 628 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 629
79a7fef2 630 atomic_set(&cmd->t_transport_queue_active, 0);
c66ac9db 631
79a7fef2 632 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 633 atomic_dec(&qobj->queue_cnt);
634 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
635
5951146d 636 return cmd;
c66ac9db
NB		 637}
638
3df8d40b 639static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
c66ac9db 640{
3df8d40b 641 struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
c66ac9db
NB		 642 unsigned long flags;
643
644 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
6708bb27 645 if (!atomic_read(&cmd->t_transport_queue_active)) {
c66ac9db
NB		 646 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
647 return;
648 }
79a7fef2
RD		 649 atomic_set(&cmd->t_transport_queue_active, 0);
650 atomic_dec(&qobj->queue_cnt);
651 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 652 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
653
a1d8b49a 654 if (atomic_read(&cmd->t_transport_queue_active)) {
6708bb27 655 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
e3d6f909 656 cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 657 atomic_read(&cmd->t_transport_queue_active));
c66ac9db
NB		 658 }
659}
660
661/*
662 * Completion function used by TCM subsystem plugins (such as FILEIO)
663 * for queueing up response from struct se_subsystem_api->do_task()
664 */
665void transport_complete_sync_cache(struct se_cmd *cmd, int good)
666{
a1d8b49a 667 struct se_task *task = list_entry(cmd->t_task_list.next,
c66ac9db
NB		 668 struct se_task, t_list);
669
670 if (good) {
671 cmd->scsi_status = SAM_STAT_GOOD;
672 task->task_scsi_status = GOOD;
673 } else {
674 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
675 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
e3d6f909 676 task->task_se_cmd->transport_error_status =
c66ac9db
NB		 677 PYX_TRANSPORT_ILLEGAL_REQUEST;
678 }
679
680 transport_complete_task(task, good);
681}
682EXPORT_SYMBOL(transport_complete_sync_cache);
683
35e0e757
CH		 684static void target_complete_failure_work(struct work_struct *work)
685{
686 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
687
688 transport_generic_request_failure(cmd, 1, 1);
689}
690
c66ac9db
NB		 691/* transport_complete_task():
692 *
693 * Called from interrupt and non interrupt context depending
694 * on the transport plugin.
695 */
696void transport_complete_task(struct se_task *task, int success)
697{
e3d6f909 698 struct se_cmd *cmd = task->task_se_cmd;
42bf829e 699 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 700 unsigned long flags;
701#if 0
6708bb27 702 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
a1d8b49a 703 cmd->t_task_cdb[0], dev);
c66ac9db 704#endif
e3d6f909 705 if (dev)
c66ac9db 706 atomic_inc(&dev->depth_left);
c66ac9db 707
a1d8b49a 708 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 709 task->task_flags &= ~TF_ACTIVE;
c66ac9db
NB		 710
711 /*
712 * See if any sense data exists, if so set the TASK_SENSE flag.
713 * Also check for any other post completion work that needs to be
714 * done by the plugins.
715 */
716 if (dev && dev->transport->transport_complete) {
717 if (dev->transport->transport_complete(task) != 0) {
718 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
719 task->task_sense = 1;
720 success = 1;
721 }
722 }
723
724 /*
725 * See if we are waiting for outstanding struct se_task
726 * to complete for an exception condition
727 */
6c76bf95 728 if (task->task_flags & TF_REQUEST_STOP) {
a1d8b49a 729 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 730 complete(&task->task_stop_comp);
731 return;
732 }
c66ac9db
NB		 733 /*
734 * Decrement the outstanding t_task_cdbs_left count. The last
735 * struct se_task from struct se_cmd will complete itself into the
736 * device queue depending upon int success.
737 */
6708bb27 738 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
a1d8b49a 739 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 740 return;
741 }
742
a1d8b49a 743 if (!success || cmd->t_tasks_failed) {
c66ac9db
NB		 744 if (!task->task_error_status) {
745 task->task_error_status =
746 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
747 cmd->transport_error_status =
748 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
749 }
35e0e757 750 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 751 } else {
a1d8b49a 752 atomic_set(&cmd->t_transport_complete, 1);
35e0e757 753 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 754 }
35e0e757 755
35e0e757
CH		 756 cmd->t_state = TRANSPORT_COMPLETE;
757 atomic_set(&cmd->t_transport_active, 1);
a1d8b49a 758 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 759
35e0e757 760 queue_work(target_completion_wq, &cmd->work);
c66ac9db
NB		 761}
762EXPORT_SYMBOL(transport_complete_task);
763
764/*
765 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
766 * struct se_task list are ready to be added to the active execution list
767 * struct se_device
768
769 * Called with se_dev_t->execute_task_lock called.
770 */
771static inline int transport_add_task_check_sam_attr(
772 struct se_task *task,
773 struct se_task *task_prev,
774 struct se_device *dev)
775{
776 /*
777 * No SAM Task attribute emulation enabled, add to tail of
778 * execution queue
779 */
780 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
781 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
782 return 0;
783 }
784 /*
785 * HEAD_OF_QUEUE attribute for received CDB, which means
786 * the first task that is associated with a struct se_cmd goes to
787 * head of the struct se_device->execute_task_list, and task_prev
788 * after that for each subsequent task
789 */
e66ecd50 790 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 791 list_add(&task->t_execute_list,
792 (task_prev != NULL) ?
793 &task_prev->t_execute_list :
794 &dev->execute_task_list);
795
6708bb27 796 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
c66ac9db 797 " in execution queue\n",
6708bb27 798 task->task_se_cmd->t_task_cdb[0]);
c66ac9db
NB		 799 return 1;
800 }
801 /*
802 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
803 * transitioned from Dermant -> Active state, and are added to the end
804 * of the struct se_device->execute_task_list
805 */
806 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
807 return 0;
808}
809
810/* __transport_add_task_to_execute_queue():
811 *
812 * Called with se_dev_t->execute_task_lock called.
813 */
814static void __transport_add_task_to_execute_queue(
815 struct se_task *task,
816 struct se_task *task_prev,
817 struct se_device *dev)
818{
819 int head_of_queue;
820
821 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
822 atomic_inc(&dev->execute_tasks);
823
824 if (atomic_read(&task->task_state_active))
825 return;
826 /*
827 * Determine if this task needs to go to HEAD_OF_QUEUE for the
828 * state list as well. Running with SAM Task Attribute emulation
829 * will always return head_of_queue == 0 here
830 */
831 if (head_of_queue)
832 list_add(&task->t_state_list, (task_prev) ?
833 &task_prev->t_state_list :
834 &dev->state_task_list);
835 else
836 list_add_tail(&task->t_state_list, &dev->state_task_list);
837
838 atomic_set(&task->task_state_active, 1);
839
6708bb27 840 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
e3d6f909 841 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
c66ac9db
NB		 842 task, dev);
843}
844
845static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
846{
42bf829e 847 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 848 struct se_task *task;
849 unsigned long flags;
850
a1d8b49a
AG		 851 spin_lock_irqsave(&cmd->t_state_lock, flags);
852 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 853 if (atomic_read(&task->task_state_active))
854 continue;
855
856 spin_lock(&dev->execute_task_lock);
857 list_add_tail(&task->t_state_list, &dev->state_task_list);
858 atomic_set(&task->task_state_active, 1);
859
6708bb27
AG		 860 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
861 task->task_se_cmd->se_tfo->get_task_tag(
c66ac9db
NB		 862 task->task_se_cmd), task, dev);
863
864 spin_unlock(&dev->execute_task_lock);
865 }
a1d8b49a 866 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 867}
868
869static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
870{
5951146d 871 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 872 struct se_task *task, *task_prev = NULL;
873 unsigned long flags;
874
875 spin_lock_irqsave(&dev->execute_task_lock, flags);
a1d8b49a 876 list_for_each_entry(task, &cmd->t_task_list, t_list) {
04629b7b 877 if (!list_empty(&task->t_execute_list))
c66ac9db
NB		 878 continue;
879 /*
880 * __transport_add_task_to_execute_queue() handles the
881 * SAM Task Attribute emulation if enabled
882 */
883 __transport_add_task_to_execute_queue(task, task_prev, dev);
c66ac9db
NB		 884 task_prev = task;
885 }
886 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 887}
888
04629b7b
CH		 889void __transport_remove_task_from_execute_queue(struct se_task *task,
890 struct se_device *dev)
891{
892 list_del_init(&task->t_execute_list);
893 atomic_dec(&dev->execute_tasks);
894}
895
52208ae3 896void transport_remove_task_from_execute_queue(
c66ac9db
NB		 897 struct se_task *task,
898 struct se_device *dev)
899{
900 unsigned long flags;
901
04629b7b 902 if (WARN_ON(list_empty(&task->t_execute_list)))
af57c3ac 903 return;
af57c3ac 904
c66ac9db 905 spin_lock_irqsave(&dev->execute_task_lock, flags);
04629b7b 906 __transport_remove_task_from_execute_queue(task, dev);
c66ac9db
NB		 907 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
908}
909
07bde79a
NB		 910/*
911 * Handle QUEUE_FULL / -EAGAIN status
912 */
913
914static void target_qf_do_work(struct work_struct *work)
915{
916 struct se_device *dev = container_of(work, struct se_device,
917 qf_work_queue);
bcac364a 918 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 919 struct se_cmd *cmd, *cmd_tmp;
920
921 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 922 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
923 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 924
bcac364a 925 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 926 list_del(&cmd->se_qf_node);
927 atomic_dec(&dev->dev_qf_count);
928 smp_mb__after_atomic_dec();
07bde79a 929
6708bb27 930 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 931 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 932 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 933 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
934 : "UNKNOWN");
f7a5cc0b
CH		 935
936 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
07bde79a 937 }
07bde79a
NB		 938}
939
c66ac9db
NB		 940unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
941{
942 switch (cmd->data_direction) {
943 case DMA_NONE:
944 return "NONE";
945 case DMA_FROM_DEVICE:
946 return "READ";
947 case DMA_TO_DEVICE:
948 return "WRITE";
949 case DMA_BIDIRECTIONAL:
950 return "BIDI";
951 default:
952 break;
953 }
954
955 return "UNKNOWN";
956}
957
958void transport_dump_dev_state(
959 struct se_device *dev,
960 char *b,
961 int *bl)
962{
963 *bl += sprintf(b + *bl, "Status: ");
964 switch (dev->dev_status) {
965 case TRANSPORT_DEVICE_ACTIVATED:
966 *bl += sprintf(b + *bl, "ACTIVATED");
967 break;
968 case TRANSPORT_DEVICE_DEACTIVATED:
969 *bl += sprintf(b + *bl, "DEACTIVATED");
970 break;
971 case TRANSPORT_DEVICE_SHUTDOWN:
972 *bl += sprintf(b + *bl, "SHUTDOWN");
973 break;
974 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
975 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
976 *bl += sprintf(b + *bl, "OFFLINE");
977 break;
978 default:
979 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
980 break;
981 }
982
983 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
984 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
985 dev->queue_depth);
986 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
e3d6f909 987 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db
NB		 988 *bl += sprintf(b + *bl, " ");
989}
990
c66ac9db
NB		 991void transport_dump_vpd_proto_id(
992 struct t10_vpd *vpd,
993 unsigned char *p_buf,
994 int p_buf_len)
995{
996 unsigned char buf[VPD_TMP_BUF_SIZE];
997 int len;
998
999 memset(buf, 0, VPD_TMP_BUF_SIZE);
1000 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1001
1002 switch (vpd->protocol_identifier) {
1003 case 0x00:
1004 sprintf(buf+len, "Fibre Channel\n");
1005 break;
1006 case 0x10:
1007 sprintf(buf+len, "Parallel SCSI\n");
1008 break;
1009 case 0x20:
1010 sprintf(buf+len, "SSA\n");
1011 break;
1012 case 0x30:
1013 sprintf(buf+len, "IEEE 1394\n");
1014 break;
1015 case 0x40:
1016 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1017 " Protocol\n");
1018 break;
1019 case 0x50:
1020 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1021 break;
1022 case 0x60:
1023 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1024 break;
1025 case 0x70:
1026 sprintf(buf+len, "Automation/Drive Interface Transport"
1027 " Protocol\n");
1028 break;
1029 case 0x80:
1030 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1031 break;
1032 default:
1033 sprintf(buf+len, "Unknown 0x%02x\n",
1034 vpd->protocol_identifier);
1035 break;
1036 }
1037
1038 if (p_buf)
1039 strncpy(p_buf, buf, p_buf_len);
1040 else
6708bb27 1041 pr_debug("%s", buf);
c66ac9db
NB		 1042}
1043
1044void
1045transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1046{
1047 /*
1048 * Check if the Protocol Identifier Valid (PIV) bit is set..
1049 *
1050 * from spc3r23.pdf section 7.5.1
1051 */
1052 if (page_83[1] & 0x80) {
1053 vpd->protocol_identifier = (page_83[0] & 0xf0);
1054 vpd->protocol_identifier_set = 1;
1055 transport_dump_vpd_proto_id(vpd, NULL, 0);
1056 }
1057}
1058EXPORT_SYMBOL(transport_set_vpd_proto_id);
1059
1060int transport_dump_vpd_assoc(
1061 struct t10_vpd *vpd,
1062 unsigned char *p_buf,
1063 int p_buf_len)
1064{
1065 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1066 int ret = 0;
1067 int len;
c66ac9db
NB		 1068
1069 memset(buf, 0, VPD_TMP_BUF_SIZE);
1070 len = sprintf(buf, "T10 VPD Identifier Association: ");
1071
1072 switch (vpd->association) {
1073 case 0x00:
1074 sprintf(buf+len, "addressed logical unit\n");
1075 break;
1076 case 0x10:
1077 sprintf(buf+len, "target port\n");
1078 break;
1079 case 0x20:
1080 sprintf(buf+len, "SCSI target device\n");
1081 break;
1082 default:
1083 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 1084 ret = -EINVAL;
c66ac9db
NB		 1085 break;
1086 }
1087
1088 if (p_buf)
1089 strncpy(p_buf, buf, p_buf_len);
1090 else
6708bb27 1091 pr_debug("%s", buf);
c66ac9db
NB		 1092
1093 return ret;
1094}
1095
1096int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1097{
1098 /*
1099 * The VPD identification association..
1100 *
1101 * from spc3r23.pdf Section 7.6.3.1 Table 297
1102 */
1103 vpd->association = (page_83[1] & 0x30);
1104 return transport_dump_vpd_assoc(vpd, NULL, 0);
1105}
1106EXPORT_SYMBOL(transport_set_vpd_assoc);
1107
1108int transport_dump_vpd_ident_type(
1109 struct t10_vpd *vpd,
1110 unsigned char *p_buf,
1111 int p_buf_len)
1112{
1113 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1114 int ret = 0;
1115 int len;
c66ac9db
NB		 1116
1117 memset(buf, 0, VPD_TMP_BUF_SIZE);
1118 len = sprintf(buf, "T10 VPD Identifier Type: ");
1119
1120 switch (vpd->device_identifier_type) {
1121 case 0x00:
1122 sprintf(buf+len, "Vendor specific\n");
1123 break;
1124 case 0x01:
1125 sprintf(buf+len, "T10 Vendor ID based\n");
1126 break;
1127 case 0x02:
1128 sprintf(buf+len, "EUI-64 based\n");
1129 break;
1130 case 0x03:
1131 sprintf(buf+len, "NAA\n");
1132 break;
1133 case 0x04:
1134 sprintf(buf+len, "Relative target port identifier\n");
1135 break;
1136 case 0x08:
1137 sprintf(buf+len, "SCSI name string\n");
1138 break;
1139 default:
1140 sprintf(buf+len, "Unsupported: 0x%02x\n",
1141 vpd->device_identifier_type);
e3d6f909 1142 ret = -EINVAL;
c66ac9db
NB		 1143 break;
1144 }
1145
e3d6f909
AG		 1146 if (p_buf) {
1147 if (p_buf_len < strlen(buf)+1)
1148 return -EINVAL;
c66ac9db 1149 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1150 } else {
6708bb27 1151 pr_debug("%s", buf);
e3d6f909 1152 }
c66ac9db
NB		 1153
1154 return ret;
1155}
1156
1157int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1158{
1159 /*
1160 * The VPD identifier type..
1161 *
1162 * from spc3r23.pdf Section 7.6.3.1 Table 298
1163 */
1164 vpd->device_identifier_type = (page_83[1] & 0x0f);
1165 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1166}
1167EXPORT_SYMBOL(transport_set_vpd_ident_type);
1168
1169int transport_dump_vpd_ident(
1170 struct t10_vpd *vpd,
1171 unsigned char *p_buf,
1172 int p_buf_len)
1173{
1174 unsigned char buf[VPD_TMP_BUF_SIZE];
1175 int ret = 0;
1176
1177 memset(buf, 0, VPD_TMP_BUF_SIZE);
1178
1179 switch (vpd->device_identifier_code_set) {
1180 case 0x01: /* Binary */
1181 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1182 &vpd->device_identifier[0]);
1183 break;
1184 case 0x02: /* ASCII */
1185 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1186 &vpd->device_identifier[0]);
1187 break;
1188 case 0x03: /* UTF-8 */
1189 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1190 &vpd->device_identifier[0]);
1191 break;
1192 default:
1193 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1194 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1195 ret = -EINVAL;
c66ac9db
NB		 1196 break;
1197 }
1198
1199 if (p_buf)
1200 strncpy(p_buf, buf, p_buf_len);
1201 else
6708bb27 1202 pr_debug("%s", buf);
c66ac9db
NB		 1203
1204 return ret;
1205}
1206
1207int
1208transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1209{
1210 static const char hex_str[] = "0123456789abcdef";
1211 int j = 0, i = 4; /* offset to start of the identifer */
1212
1213 /*
1214 * The VPD Code Set (encoding)
1215 *
1216 * from spc3r23.pdf Section 7.6.3.1 Table 296
1217 */
1218 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1219 switch (vpd->device_identifier_code_set) {
1220 case 0x01: /* Binary */
1221 vpd->device_identifier[j++] =
1222 hex_str[vpd->device_identifier_type];
1223 while (i < (4 + page_83[3])) {
1224 vpd->device_identifier[j++] =
1225 hex_str[(page_83[i] & 0xf0) >> 4];
1226 vpd->device_identifier[j++] =
1227 hex_str[page_83[i] & 0x0f];
1228 i++;
1229 }
1230 break;
1231 case 0x02: /* ASCII */
1232 case 0x03: /* UTF-8 */
1233 while (i < (4 + page_83[3]))
1234 vpd->device_identifier[j++] = page_83[i++];
1235 break;
1236 default:
1237 break;
1238 }
1239
1240 return transport_dump_vpd_ident(vpd, NULL, 0);
1241}
1242EXPORT_SYMBOL(transport_set_vpd_ident);
1243
1244static void core_setup_task_attr_emulation(struct se_device *dev)
1245{
1246 /*
1247 * If this device is from Target_Core_Mod/pSCSI, disable the
1248 * SAM Task Attribute emulation.
1249 *
1250 * This is currently not available in upsream Linux/SCSI Target
1251 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1252 */
e3d6f909 1253 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1254 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1255 return;
1256 }
1257
1258 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1259 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1260 " device\n", dev->transport->name,
1261 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1262}
1263
1264static void scsi_dump_inquiry(struct se_device *dev)
1265{
e3d6f909 1266 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
c66ac9db
NB		 1267 int i, device_type;
1268 /*
1269 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1270 */
6708bb27 1271 pr_debug(" Vendor: ");
c66ac9db
NB		 1272 for (i = 0; i < 8; i++)
1273 if (wwn->vendor[i] >= 0x20)
6708bb27 1274 pr_debug("%c", wwn->vendor[i]);
c66ac9db 1275 else
6708bb27 1276 pr_debug(" ");
c66ac9db 1277
6708bb27 1278 pr_debug(" Model: ");
c66ac9db
NB		 1279 for (i = 0; i < 16; i++)
1280 if (wwn->model[i] >= 0x20)
6708bb27 1281 pr_debug("%c", wwn->model[i]);
c66ac9db 1282 else
6708bb27 1283 pr_debug(" ");
c66ac9db 1284
6708bb27 1285 pr_debug(" Revision: ");
c66ac9db
NB		 1286 for (i = 0; i < 4; i++)
1287 if (wwn->revision[i] >= 0x20)
6708bb27 1288 pr_debug("%c", wwn->revision[i]);
c66ac9db 1289 else
6708bb27 1290 pr_debug(" ");
c66ac9db 1291
6708bb27 1292 pr_debug("\n");
c66ac9db 1293
e3d6f909 1294 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1295 pr_debug(" Type: %s ", scsi_device_type(device_type));
1296 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1297 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1298}
1299
1300struct se_device *transport_add_device_to_core_hba(
1301 struct se_hba *hba,
1302 struct se_subsystem_api *transport,
1303 struct se_subsystem_dev *se_dev,
1304 u32 device_flags,
1305 void *transport_dev,
1306 struct se_dev_limits *dev_limits,
1307 const char *inquiry_prod,
1308 const char *inquiry_rev)
1309{
12a18bdc 1310 int force_pt;
c66ac9db
NB		 1311 struct se_device *dev;
1312
1313 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1314 if (!dev) {
1315 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1316 return NULL;
1317 }
c66ac9db 1318
e3d6f909 1319 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1320 dev->dev_flags = device_flags;
1321 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1322 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1323 dev->se_hba = hba;
1324 dev->se_sub_dev = se_dev;
1325 dev->transport = transport;
1326 atomic_set(&dev->active_cmds, 0);
1327 INIT_LIST_HEAD(&dev->dev_list);
1328 INIT_LIST_HEAD(&dev->dev_sep_list);
1329 INIT_LIST_HEAD(&dev->dev_tmr_list);
1330 INIT_LIST_HEAD(&dev->execute_task_list);
1331 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1332 INIT_LIST_HEAD(&dev->ordered_cmd_list);
1333 INIT_LIST_HEAD(&dev->state_task_list);
07bde79a 1334 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1335 spin_lock_init(&dev->execute_task_lock);
1336 spin_lock_init(&dev->delayed_cmd_lock);
1337 spin_lock_init(&dev->ordered_cmd_lock);
1338 spin_lock_init(&dev->state_task_lock);
1339 spin_lock_init(&dev->dev_alua_lock);
1340 spin_lock_init(&dev->dev_reservation_lock);
1341 spin_lock_init(&dev->dev_status_lock);
1342 spin_lock_init(&dev->dev_status_thr_lock);
1343 spin_lock_init(&dev->se_port_lock);
1344 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1345 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1346
1347 dev->queue_depth = dev_limits->queue_depth;
1348 atomic_set(&dev->depth_left, dev->queue_depth);
1349 atomic_set(&dev->dev_ordered_id, 0);
1350
1351 se_dev_set_default_attribs(dev, dev_limits);
1352
1353 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1354 dev->creation_time = get_jiffies_64();
1355 spin_lock_init(&dev->stats_lock);
1356
1357 spin_lock(&hba->device_lock);
1358 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1359 hba->dev_count++;
1360 spin_unlock(&hba->device_lock);
1361 /*
1362 * Setup the SAM Task Attribute emulation for struct se_device
1363 */
1364 core_setup_task_attr_emulation(dev);
1365 /*
1366 * Force PR and ALUA passthrough emulation with internal object use.
1367 */
1368 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1369 /*
1370 * Setup the Reservations infrastructure for struct se_device
1371 */
1372 core_setup_reservations(dev, force_pt);
1373 /*
1374 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1375 */
1376 if (core_setup_alua(dev, force_pt) < 0)
1377 goto out;
1378
1379 /*
1380 * Startup the struct se_device processing thread
1381 */
1382 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1383 "LIO_%s", dev->transport->name);
c66ac9db 1384 if (IS_ERR(dev->process_thread)) {
6708bb27 1385 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1386 dev->transport->name);
c66ac9db
NB		 1387 goto out;
1388 }
07bde79a
NB		 1389 /*
1390 * Setup work_queue for QUEUE_FULL
1391 */
1392 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1393 /*
1394 * Preload the initial INQUIRY const values if we are doing
1395 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1396 * passthrough because this is being provided by the backend LLD.
1397 * This is required so that transport_get_inquiry() copies these
1398 * originals once back into DEV_T10_WWN(dev) for the virtual device
1399 * setup.
1400 */
e3d6f909 1401 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1402 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1403 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1404 " INQUIRY consts\n");
1405 goto out;
1406 }
1407
e3d6f909
AG		 1408 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1409 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1410 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1411 }
1412 scsi_dump_inquiry(dev);
1413
12a18bdc 1414 return dev;
c66ac9db 1415out:
c66ac9db
NB		 1416 kthread_stop(dev->process_thread);
1417
1418 spin_lock(&hba->device_lock);
1419 list_del(&dev->dev_list);
1420 hba->dev_count--;
1421 spin_unlock(&hba->device_lock);
1422
1423 se_release_vpd_for_dev(dev);
1424
c66ac9db
NB		 1425 kfree(dev);
1426
1427 return NULL;
1428}
1429EXPORT_SYMBOL(transport_add_device_to_core_hba);
1430
1431/* transport_generic_prepare_cdb():
1432 *
1433 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1434 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1435 * The point of this is since we are mapping iSCSI LUNs to
1436 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1437 * devices and HBAs for a loop.
1438 */
1439static inline void transport_generic_prepare_cdb(
1440 unsigned char *cdb)
1441{
1442 switch (cdb[0]) {
1443 case READ_10: /* SBC - RDProtect */
1444 case READ_12: /* SBC - RDProtect */
1445 case READ_16: /* SBC - RDProtect */
1446 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1447 case VERIFY: /* SBC - VRProtect */
1448 case VERIFY_16: /* SBC - VRProtect */
1449 case WRITE_VERIFY: /* SBC - VRProtect */
1450 case WRITE_VERIFY_12: /* SBC - VRProtect */
1451 break;
1452 default:
1453 cdb[1] &= 0x1f; /* clear logical unit number */
1454 break;
1455 }
1456}
1457
1458static struct se_task *
1459transport_generic_get_task(struct se_cmd *cmd,
1460 enum dma_data_direction data_direction)
1461{
1462 struct se_task *task;
5951146d 1463 struct se_device *dev = cmd->se_dev;
c66ac9db 1464
6708bb27 1465 task = dev->transport->alloc_task(cmd->t_task_cdb);
c66ac9db 1466 if (!task) {
6708bb27 1467 pr_err("Unable to allocate struct se_task\n");
c66ac9db
NB		 1468 return NULL;
1469 }
1470
1471 INIT_LIST_HEAD(&task->t_list);
1472 INIT_LIST_HEAD(&task->t_execute_list);
1473 INIT_LIST_HEAD(&task->t_state_list);
1474 init_completion(&task->task_stop_comp);
c66ac9db 1475 task->task_se_cmd = cmd;
c66ac9db
NB		 1476 task->task_data_direction = data_direction;
1477
c66ac9db
NB		 1478 return task;
1479}
1480
1481static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1482
c66ac9db
NB		 1483/*
1484 * Used by fabric modules containing a local struct se_cmd within their
1485 * fabric dependent per I/O descriptor.
1486 */
1487void transport_init_se_cmd(
1488 struct se_cmd *cmd,
1489 struct target_core_fabric_ops *tfo,
1490 struct se_session *se_sess,
1491 u32 data_length,
1492 int data_direction,
1493 int task_attr,
1494 unsigned char *sense_buffer)
1495{
5951146d
AG		 1496 INIT_LIST_HEAD(&cmd->se_lun_node);
1497 INIT_LIST_HEAD(&cmd->se_delayed_node);
1498 INIT_LIST_HEAD(&cmd->se_ordered_node);
07bde79a 1499 INIT_LIST_HEAD(&cmd->se_qf_node);
79a7fef2 1500 INIT_LIST_HEAD(&cmd->se_queue_node);
c66ac9db 1501
a1d8b49a
AG		 1502 INIT_LIST_HEAD(&cmd->t_task_list);
1503 init_completion(&cmd->transport_lun_fe_stop_comp);
1504 init_completion(&cmd->transport_lun_stop_comp);
1505 init_completion(&cmd->t_transport_stop_comp);
1506 spin_lock_init(&cmd->t_state_lock);
1507 atomic_set(&cmd->transport_dev_active, 1);
c66ac9db
NB		 1508
1509 cmd->se_tfo = tfo;
1510 cmd->se_sess = se_sess;
1511 cmd->data_length = data_length;
1512 cmd->data_direction = data_direction;
1513 cmd->sam_task_attr = task_attr;
1514 cmd->sense_buffer = sense_buffer;
1515}
1516EXPORT_SYMBOL(transport_init_se_cmd);
1517
1518static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1519{
1520 /*
1521 * Check if SAM Task Attribute emulation is enabled for this
1522 * struct se_device storage object
1523 */
5951146d 1524 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1525 return 0;
1526
e66ecd50 1527 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1528 pr_debug("SAM Task Attribute ACA"
c66ac9db 1529 " emulation is not supported\n");
e3d6f909 1530 return -EINVAL;
c66ac9db
NB		 1531 }
1532 /*
1533 * Used to determine when ORDERED commands should go from
1534 * Dormant to Active status.
1535 */
5951146d 1536 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1537 smp_mb__after_atomic_inc();
6708bb27 1538 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1539 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1540 cmd->se_dev->transport->name);
c66ac9db
NB		 1541 return 0;
1542}
1543
c66ac9db
NB		 1544/* transport_generic_allocate_tasks():
1545 *
1546 * Called from fabric RX Thread.
1547 */
1548int transport_generic_allocate_tasks(
1549 struct se_cmd *cmd,
1550 unsigned char *cdb)
1551{
1552 int ret;
1553
1554 transport_generic_prepare_cdb(cdb);
c66ac9db
NB		 1555 /*
1556 * Ensure that the received CDB is less than the max (252 + 8) bytes
1557 * for VARIABLE_LENGTH_CMD
1558 */
1559 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1560 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1561 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1562 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
e3d6f909 1563 return -EINVAL;
c66ac9db
NB		 1564 }
1565 /*
1566 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1567 * allocate the additional extended CDB buffer now.. Otherwise
1568 * setup the pointer from __t_task_cdb to t_task_cdb.
1569 */
a1d8b49a
AG		 1570 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1571 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1572 GFP_KERNEL);
6708bb27
AG		 1573 if (!cmd->t_task_cdb) {
1574 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1575 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1576 scsi_command_size(cdb),
a1d8b49a 1577 (unsigned long)sizeof(cmd->__t_task_cdb));
e3d6f909 1578 return -ENOMEM;
c66ac9db
NB		 1579 }
1580 } else
a1d8b49a 1581 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1582 /*
a1d8b49a 1583 * Copy the original CDB into cmd->
c66ac9db 1584 */
a1d8b49a 1585 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1586 /*
1587 * Setup the received CDB based on SCSI defined opcodes and
1588 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1589 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1590 * pointer is expected to be setup before we reach this point.
1591 */
1592 ret = transport_generic_cmd_sequencer(cmd, cdb);
1593 if (ret < 0)
1594 return ret;
1595 /*
1596 * Check for SAM Task Attribute Emulation
1597 */
1598 if (transport_check_alloc_task_attr(cmd) < 0) {
1599 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1600 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1601 return -EINVAL;
c66ac9db
NB		 1602 }
1603 spin_lock(&cmd->se_lun->lun_sep_lock);
1604 if (cmd->se_lun->lun_sep)
1605 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1606 spin_unlock(&cmd->se_lun->lun_sep_lock);
1607 return 0;
1608}
1609EXPORT_SYMBOL(transport_generic_allocate_tasks);
1610
695434e1
NB		 1611/*
1612 * Used by fabric module frontends to queue tasks directly.
1613 * Many only be used from process context only
1614 */
1615int transport_handle_cdb_direct(
1616 struct se_cmd *cmd)
1617{
dd8ae59d
NB		 1618 int ret;
1619
695434e1
NB		 1620 if (!cmd->se_lun) {
1621 dump_stack();
6708bb27 1622 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1623 return -EINVAL;
1624 }
1625 if (in_interrupt()) {
1626 dump_stack();
6708bb27 1627 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1628 " from interrupt context\n");
1629 return -EINVAL;
1630 }
dd8ae59d
NB		 1631 /*
1632 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1633 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1634 * in existing usage to ensure that outstanding descriptors are handled
d14921d6 1635 * correctly during shutdown via transport_wait_for_tasks()
dd8ae59d
NB		 1636 *
1637 * Also, we don't take cmd->t_state_lock here as we only expect
1638 * this to be called for initial descriptor submission.
1639 */
1640 cmd->t_state = TRANSPORT_NEW_CMD;
1641 atomic_set(&cmd->t_transport_active, 1);
1642 /*
1643 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1644 * so follow TRANSPORT_NEW_CMD processing thread context usage
1645 * and call transport_generic_request_failure() if necessary..
1646 */
1647 ret = transport_generic_new_cmd(cmd);
1648 if (ret == -EAGAIN)
1649 return 0;
1650 else if (ret < 0) {
1651 cmd->transport_error_status = ret;
4499dda8 1652 transport_generic_request_failure(cmd, 0,
dd8ae59d
NB		 1653 (cmd->data_direction != DMA_TO_DEVICE));
1654 }
1655 return 0;
695434e1
NB		 1656}
1657EXPORT_SYMBOL(transport_handle_cdb_direct);
1658
c66ac9db
NB		 1659/*
1660 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1661 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1662 * complete setup in TCM process context w/ TFO->new_cmd_map().
1663 */
1664int transport_generic_handle_cdb_map(
1665 struct se_cmd *cmd)
1666{
e3d6f909 1667 if (!cmd->se_lun) {
c66ac9db 1668 dump_stack();
6708bb27 1669 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1670 return -EINVAL;
c66ac9db
NB		 1671 }
1672
f7a5cc0b 1673 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
c66ac9db
NB		 1674 return 0;
1675}
1676EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1677
1678/* transport_generic_handle_data():
1679 *
1680 *
1681 */
1682int transport_generic_handle_data(
1683 struct se_cmd *cmd)
1684{
1685 /*
1686 * For the software fabric case, then we assume the nexus is being
1687 * failed/shutdown when signals are pending from the kthread context
1688 * caller, so we return a failure. For the HW target mode case running
1689 * in interrupt code, the signal_pending() check is skipped.
1690 */
1691 if (!in_interrupt() && signal_pending(current))
e3d6f909 1692 return -EPERM;
c66ac9db
NB		 1693 /*
1694 * If the received CDB has aleady been ABORTED by the generic
1695 * target engine, we now call transport_check_aborted_status()
1696 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1697 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1698 * sequences at this point.
1699 */
1700 if (transport_check_aborted_status(cmd, 1) != 0)
1701 return 0;
1702
f7a5cc0b 1703 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
c66ac9db
NB		 1704 return 0;
1705}
1706EXPORT_SYMBOL(transport_generic_handle_data);
1707
1708/* transport_generic_handle_tmr():
1709 *
1710 *
1711 */
1712int transport_generic_handle_tmr(
1713 struct se_cmd *cmd)
1714{
f7a5cc0b 1715 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
c66ac9db
NB		 1716 return 0;
1717}
1718EXPORT_SYMBOL(transport_generic_handle_tmr);
1719
f4366772
NB		 1720void transport_generic_free_cmd_intr(
1721 struct se_cmd *cmd)
1722{
f7a5cc0b 1723 transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR, false);
f4366772
NB		 1724}
1725EXPORT_SYMBOL(transport_generic_free_cmd_intr);
1726
cdbb70bb
CH		 1727/*
1728 * If the task is active, request it to be stopped and sleep until it
1729 * has completed.
1730 */
1731bool target_stop_task(struct se_task *task, unsigned long *flags)
1732{
1733 struct se_cmd *cmd = task->task_se_cmd;
1734 bool was_active = false;
1735
1736 if (task->task_flags & TF_ACTIVE) {
1737 task->task_flags |= TF_REQUEST_STOP;
1738 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1739
1740 pr_debug("Task %p waiting to complete\n", task);
1741 wait_for_completion(&task->task_stop_comp);
1742 pr_debug("Task %p stopped successfully\n", task);
1743
1744 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1745 atomic_dec(&cmd->t_task_cdbs_left);
1746 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1747 was_active = true;
1748 }
1749
cdbb70bb
CH		 1750 return was_active;
1751}
1752
c66ac9db
NB		 1753static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1754{
1755 struct se_task *task, *task_tmp;
1756 unsigned long flags;
1757 int ret = 0;
1758
6708bb27 1759 pr_debug("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 1760 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 1761
1762 /*
1763 * No tasks remain in the execution queue
1764 */
a1d8b49a 1765 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1766 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 1767 &cmd->t_task_list, t_list) {
04629b7b 1768 pr_debug("Processing task %p\n", task);
c66ac9db
NB		 1769 /*
1770 * If the struct se_task has not been sent and is not active,
1771 * remove the struct se_task from the execution queue.
1772 */
6c76bf95 1773 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
a1d8b49a 1774 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1775 flags);
1776 transport_remove_task_from_execute_queue(task,
42bf829e 1777 cmd->se_dev);
c66ac9db 1778
04629b7b 1779 pr_debug("Task %p removed from execute queue\n", task);
a1d8b49a 1780 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 1781 continue;
1782 }
1783
cdbb70bb 1784 if (!target_stop_task(task, &flags)) {
04629b7b 1785 pr_debug("Task %p - did nothing\n", task);
c66ac9db
NB		 1786 ret++;
1787 }
c66ac9db 1788 }
a1d8b49a 1789 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1790
1791 return ret;
1792}
1793
c66ac9db
NB		 1794/*
1795 * Handle SAM-esque emulation for generic transport request failures.
1796 */
1797static void transport_generic_request_failure(
1798 struct se_cmd *cmd,
c66ac9db
NB		 1799 int complete,
1800 int sc)
1801{
07bde79a
NB		 1802 int ret = 0;
1803
6708bb27 1804 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1805 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1806 cmd->t_task_cdb[0]);
f2da9dbd 1807 pr_debug("-----[ i_state: %d t_state: %d transport_error_status: %d\n",
e3d6f909 1808 cmd->se_tfo->get_cmd_state(cmd),
f2da9dbd 1809 cmd->t_state,
c66ac9db 1810 cmd->transport_error_status);
6708bb27 1811 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
c66ac9db
NB		 1812 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1813 " t_transport_active: %d t_transport_stop: %d"
6708bb27 1814 " t_transport_sent: %d\n", cmd->t_task_list_num,
a1d8b49a
AG		 1815 atomic_read(&cmd->t_task_cdbs_left),
1816 atomic_read(&cmd->t_task_cdbs_sent),
1817 atomic_read(&cmd->t_task_cdbs_ex_left),
1818 atomic_read(&cmd->t_transport_active),
1819 atomic_read(&cmd->t_transport_stop),
1820 atomic_read(&cmd->t_transport_sent));
c66ac9db 1821
c66ac9db
NB		 1822 /*
1823 * For SAM Task Attribute emulation for failed struct se_cmd
1824 */
1825 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1826 transport_complete_task_attr(cmd);
1827
1828 if (complete) {
c66ac9db
NB		 1829 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
1830 }
1831
1832 switch (cmd->transport_error_status) {
1833 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
1834 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1835 break;
1836 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
1837 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
1838 break;
1839 case PYX_TRANSPORT_INVALID_CDB_FIELD:
1840 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1841 break;
1842 case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
1843 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1844 break;
1845 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
1846 if (!sc)
1847 transport_new_cmd_failure(cmd);
1848 /*
1849 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1850 * we force this session to fall back to session
1851 * recovery.
1852 */
e3d6f909
AG		 1853 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
1854 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
c66ac9db
NB		 1855
1856 goto check_stop;
1857 case PYX_TRANSPORT_LU_COMM_FAILURE:
1858 case PYX_TRANSPORT_ILLEGAL_REQUEST:
1859 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1860 break;
1861 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
1862 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
1863 break;
1864 case PYX_TRANSPORT_WRITE_PROTECTED:
1865 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
1866 break;
1867 case PYX_TRANSPORT_RESERVATION_CONFLICT:
1868 /*
1869 * No SENSE Data payload for this case, set SCSI Status
1870 * and queue the response to $FABRIC_MOD.
1871 *
1872 * Uses linux/include/scsi/scsi.h SAM status codes defs
1873 */
1874 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1875 /*
1876 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1877 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1878 * CONFLICT STATUS.
1879 *
1880 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1881 */
e3d6f909
AG		 1882 if (cmd->se_sess &&
1883 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1884 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1885 cmd->orig_fe_lun, 0x2C,
1886 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1887
07bde79a
NB		 1888 ret = cmd->se_tfo->queue_status(cmd);
1889 if (ret == -EAGAIN)
1890 goto queue_full;
c66ac9db
NB		 1891 goto check_stop;
1892 case PYX_TRANSPORT_USE_SENSE_REASON:
1893 /*
1894 * struct se_cmd->scsi_sense_reason already set
1895 */
1896 break;
1897 default:
6708bb27 1898 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
a1d8b49a 1899 cmd->t_task_cdb[0],
c66ac9db
NB		 1900 cmd->transport_error_status);
1901 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1902 break;
1903 }
16ab8e60
NB		 1904 /*
1905 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1906 * make the call to transport_send_check_condition_and_sense()
1907 * directly. Otherwise expect the fabric to make the call to
1908 * transport_send_check_condition_and_sense() after handling
1909 * possible unsoliticied write data payloads.
1910 */
1911 if (!sc && !cmd->se_tfo->new_cmd_map)
c66ac9db 1912 transport_new_cmd_failure(cmd);
07bde79a
NB		 1913 else {
1914 ret = transport_send_check_condition_and_sense(cmd,
1915 cmd->scsi_sense_reason, 0);
1916 if (ret == -EAGAIN)
1917 goto queue_full;
1918 }
1919
c66ac9db
NB		 1920check_stop:
1921 transport_lun_remove_cmd(cmd);
6708bb27 1922 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1923 ;
07bde79a
NB		 1924 return;
1925
1926queue_full:
e057f533
CH		 1927 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1928 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1929}
1930
c66ac9db
NB		 1931static inline u32 transport_lba_21(unsigned char *cdb)
1932{
1933 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1934}
1935
1936static inline u32 transport_lba_32(unsigned char *cdb)
1937{
1938 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1939}
1940
1941static inline unsigned long long transport_lba_64(unsigned char *cdb)
1942{
1943 unsigned int __v1, __v2;
1944
1945 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1946 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1947
1948 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1949}
1950
1951/*
1952 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1953 */
1954static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1955{
1956 unsigned int __v1, __v2;
1957
1958 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1959 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1960
1961 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1962}
1963
1964static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1965{
1966 unsigned long flags;
1967
a1d8b49a 1968 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 1969 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 1970 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 1971}
1972
c66ac9db
NB		 1973static inline int transport_tcq_window_closed(struct se_device *dev)
1974{
1975 if (dev->dev_tcq_window_closed++ <
1976 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
1977 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
1978 } else
1979 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
1980
e3d6f909 1981 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 1982 return 0;
1983}
1984
1985/*
1986 * Called from Fabric Module context from transport_execute_tasks()
1987 *
1988 * The return of this function determins if the tasks from struct se_cmd
1989 * get added to the execution queue in transport_execute_tasks(),
1990 * or are added to the delayed or ordered lists here.
1991 */
1992static inline int transport_execute_task_attr(struct se_cmd *cmd)
1993{
5951146d 1994 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1995 return 1;
1996 /*
25985edc 1997 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1998 * to allow the passed struct se_cmd list of tasks to the front of the list.
1999 */
e66ecd50 2000 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
5951146d 2001 atomic_inc(&cmd->se_dev->dev_hoq_count);
c66ac9db 2002 smp_mb__after_atomic_inc();
6708bb27 2003 pr_debug("Added HEAD_OF_QUEUE for CDB:"
c66ac9db 2004 " 0x%02x, se_ordered_id: %u\n",
6708bb27 2005 cmd->t_task_cdb[0],
c66ac9db
NB		 2006 cmd->se_ordered_id);
2007 return 1;
e66ecd50 2008 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d
AG		 2009 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2010 list_add_tail(&cmd->se_ordered_node,
2011 &cmd->se_dev->ordered_cmd_list);
2012 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
c66ac9db 2013
5951146d 2014 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 2015 smp_mb__after_atomic_inc();
2016
6708bb27 2017 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 2018 " list, se_ordered_id: %u\n",
a1d8b49a 2019 cmd->t_task_cdb[0],
c66ac9db
NB		 2020 cmd->se_ordered_id);
2021 /*
2022 * Add ORDERED command to tail of execution queue if
2023 * no other older commands exist that need to be
2024 * completed first.
2025 */
6708bb27 2026 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 2027 return 1;
2028 } else {
2029 /*
2030 * For SIMPLE and UNTAGGED Task Attribute commands
2031 */
5951146d 2032 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 2033 smp_mb__after_atomic_inc();
2034 }
2035 /*
2036 * Otherwise if one or more outstanding ORDERED task attribute exist,
2037 * add the dormant task(s) built for the passed struct se_cmd to the
2038 * execution queue and become in Active state for this struct se_device.
2039 */
5951146d 2040 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 2041 /*
2042 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 2043 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 2044 */
5951146d 2045 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2046 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 2047 list_add_tail(&cmd->se_delayed_node,
2048 &cmd->se_dev->delayed_cmd_list);
2049 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2050
6708bb27 2051 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 2052 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 2053 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 2054 cmd->se_ordered_id);
2055 /*
2056 * Return zero to let transport_execute_tasks() know
2057 * not to add the delayed tasks to the execution list.
2058 */
2059 return 0;
2060 }
2061 /*
2062 * Otherwise, no ORDERED task attributes exist..
2063 */
2064 return 1;
2065}
2066
2067/*
2068 * Called from fabric module context in transport_generic_new_cmd() and
2069 * transport_generic_process_write()
2070 */
2071static int transport_execute_tasks(struct se_cmd *cmd)
2072{
2073 int add_tasks;
2074
db1620a2
CH		 2075 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2076 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
4499dda8 2077 transport_generic_request_failure(cmd, 0, 1);
db1620a2 2078 return 0;
c66ac9db 2079 }
db1620a2 2080
c66ac9db
NB		 2081 /*
2082 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2083 * has occurred that prevents execution.
c66ac9db 2084 */
6708bb27 2085 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 2086 /*
2087 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2088 * attribute for the tasks of the received struct se_cmd CDB
2089 */
2090 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2091 if (!add_tasks)
c66ac9db
NB		 2092 goto execute_tasks;
2093 /*
2094 * This calls transport_add_tasks_from_cmd() to handle
2095 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2096 * (if enabled) in __transport_add_task_to_execute_queue() and
2097 * transport_add_task_check_sam_attr().
2098 */
2099 transport_add_tasks_from_cmd(cmd);
2100 }
2101 /*
2102 * Kick the execution queue for the cmd associated struct se_device
2103 * storage object.
2104 */
2105execute_tasks:
5951146d 2106 __transport_execute_tasks(cmd->se_dev);
c66ac9db
NB		 2107 return 0;
2108}
2109
2110/*
2111 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2112 * from struct se_device->execute_task_list and
2113 *
2114 * Called from transport_processing_thread()
2115 */
2116static int __transport_execute_tasks(struct se_device *dev)
2117{
2118 int error;
2119 struct se_cmd *cmd = NULL;
e3d6f909 2120 struct se_task *task = NULL;
c66ac9db
NB		 2121 unsigned long flags;
2122
2123 /*
2124 * Check if there is enough room in the device and HBA queue to send
a1d8b49a 2125 * struct se_tasks to the selected transport.
c66ac9db
NB		 2126 */
2127check_depth:
e3d6f909 2128 if (!atomic_read(&dev->depth_left))
c66ac9db 2129 return transport_tcq_window_closed(dev);
c66ac9db 2130
e3d6f909 2131 dev->dev_tcq_window_closed = 0;
c66ac9db 2132
e3d6f909
AG		 2133 spin_lock_irq(&dev->execute_task_lock);
2134 if (list_empty(&dev->execute_task_list)) {
2135 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2136 return 0;
2137 }
e3d6f909
AG		 2138 task = list_first_entry(&dev->execute_task_list,
2139 struct se_task, t_execute_list);
04629b7b 2140 __transport_remove_task_from_execute_queue(task, dev);
e3d6f909 2141 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2142
2143 atomic_dec(&dev->depth_left);
c66ac9db 2144
e3d6f909 2145 cmd = task->task_se_cmd;
c66ac9db 2146
a1d8b49a 2147 spin_lock_irqsave(&cmd->t_state_lock, flags);
6c76bf95 2148 task->task_flags |= (TF_ACTIVE | TF_SENT);
a1d8b49a 2149 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2150
a1d8b49a
AG		 2151 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2152 cmd->t_task_list_num)
415a090a 2153 atomic_set(&cmd->t_transport_sent, 1);
c66ac9db 2154
a1d8b49a 2155 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2156 /*
2157 * The struct se_cmd->transport_emulate_cdb() function pointer is used
e3d6f909 2158 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
c66ac9db
NB		 2159 * struct se_subsystem_api->do_task() caller below.
2160 */
2161 if (cmd->transport_emulate_cdb) {
2162 error = cmd->transport_emulate_cdb(cmd);
2163 if (error != 0) {
2164 cmd->transport_error_status = error;
6c76bf95
CH		 2165 spin_lock_irqsave(&cmd->t_state_lock, flags);
2166 task->task_flags &= ~TF_ACTIVE;
2167 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
415a090a 2168 atomic_set(&cmd->t_transport_sent, 0);
c66ac9db 2169 transport_stop_tasks_for_cmd(cmd);
4499dda8
CH		 2170 atomic_inc(&dev->depth_left);
2171 transport_generic_request_failure(cmd, 0, 1);
c66ac9db
NB		 2172 goto check_depth;
2173 }
2174 /*
2175 * Handle the successful completion for transport_emulate_cdb()
2176 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2177 * Otherwise the caller is expected to complete the task with
2178 * proper status.
2179 */
2180 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2181 cmd->scsi_status = SAM_STAT_GOOD;
2182 task->task_scsi_status = GOOD;
2183 transport_complete_task(task, 1);
2184 }
2185 } else {
2186 /*
2187 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2188 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2189 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2190 * LUN emulation code.
2191 *
2192 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2193 * call ->do_task() directly and let the underlying TCM subsystem plugin
2194 * code handle the CDB emulation.
2195 */
e3d6f909
AG		 2196 if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2197 (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
c66ac9db
NB		 2198 error = transport_emulate_control_cdb(task);
2199 else
e3d6f909 2200 error = dev->transport->do_task(task);
c66ac9db
NB		 2201
2202 if (error != 0) {
2203 cmd->transport_error_status = error;
6c76bf95
CH		 2204 spin_lock_irqsave(&cmd->t_state_lock, flags);
2205 task->task_flags &= ~TF_ACTIVE;
2206 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
415a090a 2207 atomic_set(&cmd->t_transport_sent, 0);
c66ac9db 2208 transport_stop_tasks_for_cmd(cmd);
4499dda8
CH		 2209 atomic_inc(&dev->depth_left);
2210 transport_generic_request_failure(cmd, 0, 1);
c66ac9db
NB		 2211 }
2212 }
2213
2214 goto check_depth;
2215
2216 return 0;
2217}
2218
2219void transport_new_cmd_failure(struct se_cmd *se_cmd)
2220{
2221 unsigned long flags;
2222 /*
2223 * Any unsolicited data will get dumped for failed command inside of
2224 * the fabric plugin
2225 */
a1d8b49a 2226 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2227 se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2228 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
a1d8b49a 2229 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2230}
2231
c66ac9db
NB		 2232static inline u32 transport_get_sectors_6(
2233 unsigned char *cdb,
2234 struct se_cmd *cmd,
2235 int *ret)
2236{
5951146d 2237 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2238
2239 /*
2240 * Assume TYPE_DISK for non struct se_device objects.
2241 * Use 8-bit sector value.
2242 */
2243 if (!dev)
2244 goto type_disk;
2245
2246 /*
2247 * Use 24-bit allocation length for TYPE_TAPE.
2248 */
e3d6f909 2249 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2250 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2251
2252 /*
2253 * Everything else assume TYPE_DISK Sector CDB location.
2254 * Use 8-bit sector value.
2255 */
2256type_disk:
2257 return (u32)cdb[4];
2258}
2259
2260static inline u32 transport_get_sectors_10(
2261 unsigned char *cdb,
2262 struct se_cmd *cmd,
2263 int *ret)
2264{
5951146d 2265 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2266
2267 /*
2268 * Assume TYPE_DISK for non struct se_device objects.
2269 * Use 16-bit sector value.
2270 */
2271 if (!dev)
2272 goto type_disk;
2273
2274 /*
2275 * XXX_10 is not defined in SSC, throw an exception
2276 */
e3d6f909
AG		 2277 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2278 *ret = -EINVAL;
c66ac9db
NB		 2279 return 0;
2280 }
2281
2282 /*
2283 * Everything else assume TYPE_DISK Sector CDB location.
2284 * Use 16-bit sector value.
2285 */
2286type_disk:
2287 return (u32)(cdb[7] << 8) + cdb[8];
2288}
2289
2290static inline u32 transport_get_sectors_12(
2291 unsigned char *cdb,
2292 struct se_cmd *cmd,
2293 int *ret)
2294{
5951146d 2295 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2296
2297 /*
2298 * Assume TYPE_DISK for non struct se_device objects.
2299 * Use 32-bit sector value.
2300 */
2301 if (!dev)
2302 goto type_disk;
2303
2304 /*
2305 * XXX_12 is not defined in SSC, throw an exception
2306 */
e3d6f909
AG		 2307 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2308 *ret = -EINVAL;
c66ac9db
NB		 2309 return 0;
2310 }
2311
2312 /*
2313 * Everything else assume TYPE_DISK Sector CDB location.
2314 * Use 32-bit sector value.
2315 */
2316type_disk:
2317 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2318}
2319
2320static inline u32 transport_get_sectors_16(
2321 unsigned char *cdb,
2322 struct se_cmd *cmd,
2323 int *ret)
2324{
5951146d 2325 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2326
2327 /*
2328 * Assume TYPE_DISK for non struct se_device objects.
2329 * Use 32-bit sector value.
2330 */
2331 if (!dev)
2332 goto type_disk;
2333
2334 /*
2335 * Use 24-bit allocation length for TYPE_TAPE.
2336 */
e3d6f909 2337 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2338 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2339
2340type_disk:
2341 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2342 (cdb[12] << 8) + cdb[13];
2343}
2344
2345/*
2346 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2347 */
2348static inline u32 transport_get_sectors_32(
2349 unsigned char *cdb,
2350 struct se_cmd *cmd,
2351 int *ret)
2352{
2353 /*
2354 * Assume TYPE_DISK for non struct se_device objects.
2355 * Use 32-bit sector value.
2356 */
2357 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2358 (cdb[30] << 8) + cdb[31];
2359
2360}
2361
2362static inline u32 transport_get_size(
2363 u32 sectors,
2364 unsigned char *cdb,
2365 struct se_cmd *cmd)
2366{
5951146d 2367 struct se_device *dev = cmd->se_dev;
c66ac9db 2368
e3d6f909 2369 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2370 if (cdb[1] & 1) { /* sectors */
e3d6f909 2371 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2372 } else /* bytes */
2373 return sectors;
2374 }
2375#if 0
6708bb27 2376 pr_debug("Returning block_size: %u, sectors: %u == %u for"
e3d6f909
AG		 2377 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2378 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2379 dev->transport->name);
c66ac9db 2380#endif
e3d6f909 2381 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2382}
2383
c66ac9db
NB		 2384static void transport_xor_callback(struct se_cmd *cmd)
2385{
2386 unsigned char *buf, *addr;
ec98f782 2387 struct scatterlist *sg;
c66ac9db
NB		 2388 unsigned int offset;
2389 int i;
ec98f782 2390 int count;
c66ac9db
NB		 2391 /*
2392 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2393 *
2394 * 1) read the specified logical block(s);
2395 * 2) transfer logical blocks from the data-out buffer;
2396 * 3) XOR the logical blocks transferred from the data-out buffer with
2397 * the logical blocks read, storing the resulting XOR data in a buffer;
2398 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2399 * blocks transferred from the data-out buffer; and
2400 * 5) transfer the resulting XOR data to the data-in buffer.
2401 */
2402 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2403 if (!buf) {
2404 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2405 return;
2406 }
2407 /*
ec98f782 2408 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2409 * into the locally allocated *buf
2410 */
ec98f782
AG		 2411 sg_copy_to_buffer(cmd->t_data_sg,
2412 cmd->t_data_nents,
2413 buf,
2414 cmd->data_length);
2415
c66ac9db
NB		 2416 /*
2417 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2418 * cmd->t_mem_bidi_list
c66ac9db
NB		 2419 */
2420
2421 offset = 0;
ec98f782
AG		 2422 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2423 addr = kmap_atomic(sg_page(sg), KM_USER0);
2424 if (!addr)
c66ac9db
NB		 2425 goto out;
2426
ec98f782
AG		 2427 for (i = 0; i < sg->length; i++)
2428 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2429
ec98f782 2430 offset += sg->length;
c66ac9db
NB		 2431 kunmap_atomic(addr, KM_USER0);
2432 }
ec98f782 2433
c66ac9db
NB		 2434out:
2435 kfree(buf);
2436}
2437
2438/*
2439 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2440 */
2441static int transport_get_sense_data(struct se_cmd *cmd)
2442{
2443 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
42bf829e 2444 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2445 struct se_task *task = NULL, *task_tmp;
2446 unsigned long flags;
2447 u32 offset = 0;
2448
e3d6f909
AG		 2449 WARN_ON(!cmd->se_lun);
2450
42bf829e
CH		 2451 if (!dev)
2452 return 0;
2453
a1d8b49a 2454 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2455 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2456 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2457 return 0;
2458 }
2459
2460 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2461 &cmd->t_task_list, t_list) {
c66ac9db
NB		 2462 if (!task->task_sense)
2463 continue;
2464
e3d6f909 2465 if (!dev->transport->get_sense_buffer) {
6708bb27 2466 pr_err("dev->transport->get_sense_buffer"
c66ac9db
NB		 2467 " is NULL\n");
2468 continue;
2469 }
2470
e3d6f909 2471 sense_buffer = dev->transport->get_sense_buffer(task);
6708bb27 2472 if (!sense_buffer) {
04629b7b 2473 pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
c66ac9db 2474 " sense buffer for task with sense\n",
04629b7b 2475 cmd->se_tfo->get_task_tag(cmd), task);
c66ac9db
NB		 2476 continue;
2477 }
a1d8b49a 2478 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2479
e3d6f909 2480 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2481 TRANSPORT_SENSE_BUFFER);
2482
5951146d 2483 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2484 TRANSPORT_SENSE_BUFFER);
2485 cmd->scsi_status = task->task_scsi_status;
2486 /* Automatically padded */
2487 cmd->scsi_sense_length =
2488 (TRANSPORT_SENSE_BUFFER + offset);
2489
6708bb27 2490 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
c66ac9db 2491 " and sense\n",
e3d6f909 2492 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2493 cmd->scsi_status);
2494 return 0;
2495 }
a1d8b49a 2496 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2497
2498 return -1;
2499}
2500
c66ac9db
NB		 2501static int
2502transport_handle_reservation_conflict(struct se_cmd *cmd)
2503{
c66ac9db
NB		 2504 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2505 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2506 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2507 /*
2508 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2509 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2510 * CONFLICT STATUS.
2511 *
2512 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2513 */
e3d6f909
AG		 2514 if (cmd->se_sess &&
2515 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2516 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 2517 cmd->orig_fe_lun, 0x2C,
2518 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
5951146d 2519 return -EINVAL;
c66ac9db
NB		 2520}
2521
ec98f782
AG		 2522static inline long long transport_dev_end_lba(struct se_device *dev)
2523{
2524 return dev->transport->get_blocks(dev) + 1;
2525}
2526
2527static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2528{
2529 struct se_device *dev = cmd->se_dev;
2530 u32 sectors;
2531
2532 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2533 return 0;
2534
2535 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2536
6708bb27
AG		 2537 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2538 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2539 " transport_dev_end_lba(): %llu\n",
2540 cmd->t_task_lba, sectors,
2541 transport_dev_end_lba(dev));
7abbe7f3 2542 return -EINVAL;
ec98f782
AG		 2543 }
2544
7abbe7f3 2545 return 0;
ec98f782
AG		 2546}
2547
706d5860
NB		 2548static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2549{
2550 /*
2551 * Determine if the received WRITE_SAME is used to for direct
2552 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2553 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2554 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2555 */
2556 int passthrough = (dev->transport->transport_type ==
2557 TRANSPORT_PLUGIN_PHBA_PDEV);
2558
2559 if (!passthrough) {
2560 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2561 pr_err("WRITE_SAME PBDATA and LBDATA"
2562 " bits not supported for Block Discard"
2563 " Emulation\n");
2564 return -ENOSYS;
2565 }
2566 /*
2567 * Currently for the emulated case we only accept
2568 * tpws with the UNMAP=1 bit set.
2569 */
2570 if (!(flags[0] & 0x08)) {
2571 pr_err("WRITE_SAME w/o UNMAP bit not"
2572 " supported for Block Discard Emulation\n");
2573 return -ENOSYS;
2574 }
2575 }
2576
2577 return 0;
2578}
2579
c66ac9db
NB		 2580/* transport_generic_cmd_sequencer():
2581 *
2582 * Generic Command Sequencer that should work for most DAS transport
2583 * drivers.
2584 *
2585 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2586 * RX Thread.
2587 *
2588 * FIXME: Need to support other SCSI OPCODES where as well.
2589 */
2590static int transport_generic_cmd_sequencer(
2591 struct se_cmd *cmd,
2592 unsigned char *cdb)
2593{
5951146d 2594 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2595 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2596 int ret = 0, sector_ret = 0, passthrough;
2597 u32 sectors = 0, size = 0, pr_reg_type = 0;
2598 u16 service_action;
2599 u8 alua_ascq = 0;
2600 /*
2601 * Check for an existing UNIT ATTENTION condition
2602 */
2603 if (core_scsi3_ua_check(cmd, cdb) < 0) {
c66ac9db
NB		 2604 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2605 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2606 return -EINVAL;
c66ac9db
NB		 2607 }
2608 /*
2609 * Check status of Asymmetric Logical Unit Assignment port
2610 */
e3d6f909 2611 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db 2612 if (ret != 0) {
c66ac9db 2613 /*
25985edc 2614 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2615 * The ALUA additional sense code qualifier (ASCQ) is determined
2616 * by the ALUA primary or secondary access state..
2617 */
2618 if (ret > 0) {
2619#if 0
6708bb27 2620 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2621 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2622 cmd->se_tfo->get_fabric_name(), alua_ascq);
c66ac9db
NB		 2623#endif
2624 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2625 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2626 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2627 return -EINVAL;
c66ac9db
NB		 2628 }
2629 goto out_invalid_cdb_field;
2630 }
2631 /*
2632 * Check status for SPC-3 Persistent Reservations
2633 */
e3d6f909
AG		 2634 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2635 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
c66ac9db
NB		 2636 cmd, cdb, pr_reg_type) != 0)
2637 return transport_handle_reservation_conflict(cmd);
2638 /*
2639 * This means the CDB is allowed for the SCSI Initiator port
2640 * when said port is *NOT* holding the legacy SPC-2 or
2641 * SPC-3 Persistent Reservation.
2642 */
2643 }
2644
2645 switch (cdb[0]) {
2646 case READ_6:
2647 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2648 if (sector_ret)
2649 goto out_unsupported_cdb;
2650 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2651 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2652 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2653 break;
2654 case READ_10:
2655 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2656 if (sector_ret)
2657 goto out_unsupported_cdb;
2658 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2659 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2660 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2661 break;
2662 case READ_12:
2663 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2664 if (sector_ret)
2665 goto out_unsupported_cdb;
2666 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2667 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2668 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2669 break;
2670 case READ_16:
2671 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2672 if (sector_ret)
2673 goto out_unsupported_cdb;
2674 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2675 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2676 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2677 break;
2678 case WRITE_6:
2679 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2680 if (sector_ret)
2681 goto out_unsupported_cdb;
2682 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2683 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2684 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2685 break;
2686 case WRITE_10:
2687 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2688 if (sector_ret)
2689 goto out_unsupported_cdb;
2690 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a
AG		 2691 cmd->t_task_lba = transport_lba_32(cdb);
2692 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2693 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2694 break;
2695 case WRITE_12:
2696 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2697 if (sector_ret)
2698 goto out_unsupported_cdb;
2699 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a
AG		 2700 cmd->t_task_lba = transport_lba_32(cdb);
2701 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2702 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2703 break;
2704 case WRITE_16:
2705 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2706 if (sector_ret)
2707 goto out_unsupported_cdb;
2708 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a
AG		 2709 cmd->t_task_lba = transport_lba_64(cdb);
2710 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2711 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2712 break;
2713 case XDWRITEREAD_10:
2714 if ((cmd->data_direction != DMA_TO_DEVICE) ||
a1d8b49a 2715 !(cmd->t_tasks_bidi))
c66ac9db
NB		 2716 goto out_invalid_cdb_field;
2717 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2718 if (sector_ret)
2719 goto out_unsupported_cdb;
2720 size = transport_get_size(sectors, cdb, cmd);
a1d8b49a 2721 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 2722 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
7c1c6af3
CH		 2723
2724 if (dev->transport->transport_type ==
2725 TRANSPORT_PLUGIN_PHBA_PDEV)
2726 goto out_unsupported_cdb;
c66ac9db 2727 /*
35e0e757 2728 * Setup BIDI XOR callback to be run after I/O completion.
c66ac9db
NB		 2729 */
2730 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 2731 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2732 break;
2733 case VARIABLE_LENGTH_CMD:
2734 service_action = get_unaligned_be16(&cdb[8]);
2735 /*
2736 * Determine if this is TCM/PSCSI device and we should disable
2737 * internal emulation for this CDB.
2738 */
e3d6f909 2739 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 2740 TRANSPORT_PLUGIN_PHBA_PDEV);
2741
2742 switch (service_action) {
2743 case XDWRITEREAD_32:
2744 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2745 if (sector_ret)
2746 goto out_unsupported_cdb;
2747 size = transport_get_size(sectors, cdb, cmd);
2748 /*
2749 * Use WRITE_32 and READ_32 opcodes for the emulated
2750 * XDWRITE_READ_32 logic.
2751 */
a1d8b49a 2752 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 2753 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2754
c66ac9db 2755 if (passthrough)
7c1c6af3 2756 goto out_unsupported_cdb;
c66ac9db 2757 /*
35e0e757
CH		 2758 * Setup BIDI XOR callback to be run during after I/O
2759 * completion.
c66ac9db
NB		 2760 */
2761 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 2762 cmd->t_tasks_fua = (cdb[10] & 0x8);
c66ac9db
NB		 2763 break;
2764 case WRITE_SAME_32:
2765 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2766 if (sector_ret)
2767 goto out_unsupported_cdb;
dd3a5ad8 2768
6708bb27 2769 if (sectors)
12850626 2770 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 2771 else {
2772 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2773 " supported\n");
2774 goto out_invalid_cdb_field;
2775 }
dd3a5ad8 2776
a1d8b49a 2777 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 2778 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2779
706d5860 2780 if (target_check_write_same_discard(&cdb[10], dev) < 0)
c66ac9db 2781 goto out_invalid_cdb_field;
706d5860 2782
c66ac9db
NB		 2783 break;
2784 default:
6708bb27 2785 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 2786 " 0x%04x not supported\n", service_action);
2787 goto out_unsupported_cdb;
2788 }
2789 break;
e434f1f1 2790 case MAINTENANCE_IN:
e3d6f909 2791 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2792 /* MAINTENANCE_IN from SCC-2 */
2793 /*
2794 * Check for emulated MI_REPORT_TARGET_PGS.
2795 */
2796 if (cdb[1] == MI_REPORT_TARGET_PGS) {
2797 cmd->transport_emulate_cdb =
e3d6f909 2798 (su_dev->t10_alua.alua_type ==
c66ac9db 2799 SPC3_ALUA_EMULATED) ?
e3d6f909 2800 core_emulate_report_target_port_groups :
c66ac9db
NB		 2801 NULL;
2802 }
2803 size = (cdb[6] << 24) | (cdb[7] << 16) |
2804 (cdb[8] << 8) | cdb[9];
2805 } else {
2806 /* GPCMD_SEND_KEY from multi media commands */
2807 size = (cdb[8] << 8) + cdb[9];
2808 }
05d1c7c0 2809 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2810 break;
2811 case MODE_SELECT:
2812 size = cdb[4];
2813 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2814 break;
2815 case MODE_SELECT_10:
2816 size = (cdb[7] << 8) + cdb[8];
2817 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2818 break;
2819 case MODE_SENSE:
2820 size = cdb[4];
05d1c7c0 2821 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2822 break;
2823 case MODE_SENSE_10:
2824 case GPCMD_READ_BUFFER_CAPACITY:
2825 case GPCMD_SEND_OPC:
2826 case LOG_SELECT:
2827 case LOG_SENSE:
2828 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2829 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2830 break;
2831 case READ_BLOCK_LIMITS:
2832 size = READ_BLOCK_LEN;
05d1c7c0 2833 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2834 break;
2835 case GPCMD_GET_CONFIGURATION:
2836 case GPCMD_READ_FORMAT_CAPACITIES:
2837 case GPCMD_READ_DISC_INFO:
2838 case GPCMD_READ_TRACK_RZONE_INFO:
2839 size = (cdb[7] << 8) + cdb[8];
2840 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2841 break;
2842 case PERSISTENT_RESERVE_IN:
2843 case PERSISTENT_RESERVE_OUT:
2844 cmd->transport_emulate_cdb =
e3d6f909 2845 (su_dev->t10_pr.res_type ==
c66ac9db 2846 SPC3_PERSISTENT_RESERVATIONS) ?
e3d6f909 2847 core_scsi3_emulate_pr : NULL;
c66ac9db 2848 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 2849 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2850 break;
2851 case GPCMD_MECHANISM_STATUS:
2852 case GPCMD_READ_DVD_STRUCTURE:
2853 size = (cdb[8] << 8) + cdb[9];
2854 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2855 break;
2856 case READ_POSITION:
2857 size = READ_POSITION_LEN;
05d1c7c0 2858 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 2859 break;
e434f1f1 2860 case MAINTENANCE_OUT:
e3d6f909 2861 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 2862 /* MAINTENANCE_OUT from SCC-2
2863 *
2864 * Check for emulated MO_SET_TARGET_PGS.
2865 */
2866 if (cdb[1] == MO_SET_TARGET_PGS) {
2867 cmd->transport_emulate_cdb =
e3d6f909 2868 (su_dev->t10_alua.alua_type ==
c66ac9db 2869 SPC3_ALUA_EMULATED) ?
e3d6f909 2870 core_emulate_set_target_port_groups :
c66ac9db
NB		 2871 NULL;
2872 }
2873
2874 size = (cdb[6] << 24) | (cdb[7] << 16) |
2875 (cdb[8] << 8) | cdb[9];
2876 } else {
2877 /* GPCMD_REPORT_KEY from multi media commands */
2878 size = (cdb[8] << 8) + cdb[9];
2879 }
05d1c7c0 2880 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2881 break;
2882 case INQUIRY:
2883 size = (cdb[3] << 8) + cdb[4];
2884 /*
2885 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2886 * See spc4r17 section 5.3
2887 */
5951146d 2888 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 2889 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 2890 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2891 break;
2892 case READ_BUFFER:
2893 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2894 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2895 break;
2896 case READ_CAPACITY:
2897 size = READ_CAP_LEN;
05d1c7c0 2898 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2899 break;
2900 case READ_MEDIA_SERIAL_NUMBER:
2901 case SECURITY_PROTOCOL_IN:
2902 case SECURITY_PROTOCOL_OUT:
2903 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 2904 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2905 break;
2906 case SERVICE_ACTION_IN:
2907 case ACCESS_CONTROL_IN:
2908 case ACCESS_CONTROL_OUT:
2909 case EXTENDED_COPY:
2910 case READ_ATTRIBUTE:
2911 case RECEIVE_COPY_RESULTS:
2912 case WRITE_ATTRIBUTE:
2913 size = (cdb[10] << 24) | (cdb[11] << 16) |
2914 (cdb[12] << 8) | cdb[13];
05d1c7c0 2915 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2916 break;
2917 case RECEIVE_DIAGNOSTIC:
2918 case SEND_DIAGNOSTIC:
2919 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 2920 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2921 break;
2922/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2923#if 0
2924 case GPCMD_READ_CD:
2925 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2926 size = (2336 * sectors);
05d1c7c0 2927 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2928 break;
2929#endif
2930 case READ_TOC:
2931 size = cdb[8];
05d1c7c0 2932 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2933 break;
2934 case REQUEST_SENSE:
2935 size = cdb[4];
05d1c7c0 2936 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2937 break;
2938 case READ_ELEMENT_STATUS:
2939 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 2940 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2941 break;
2942 case WRITE_BUFFER:
2943 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 2944 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 2945 break;
2946 case RESERVE:
2947 case RESERVE_10:
2948 /*
2949 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2950 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2951 */
2952 if (cdb[0] == RESERVE_10)
2953 size = (cdb[7] << 8) | cdb[8];
2954 else
2955 size = cmd->data_length;
2956
2957 /*
2958 * Setup the legacy emulated handler for SPC-2 and
2959 * >= SPC-3 compatible reservation handling (CRH=1)
2960 * Otherwise, we assume the underlying SCSI logic is
2961 * is running in SPC_PASSTHROUGH, and wants reservations
2962 * emulation disabled.
2963 */
2964 cmd->transport_emulate_cdb =
e3d6f909 2965 (su_dev->t10_pr.res_type !=
c66ac9db 2966 SPC_PASSTHROUGH) ?
e3d6f909 2967 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 2968 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2969 break;
2970 case RELEASE:
2971 case RELEASE_10:
2972 /*
2973 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2974 * Assume the passthrough or $FABRIC_MOD will tell us about it.
2975 */
2976 if (cdb[0] == RELEASE_10)
2977 size = (cdb[7] << 8) | cdb[8];
2978 else
2979 size = cmd->data_length;
2980
2981 cmd->transport_emulate_cdb =
e3d6f909 2982 (su_dev->t10_pr.res_type !=
c66ac9db 2983 SPC_PASSTHROUGH) ?
e3d6f909 2984 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 2985 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2986 break;
2987 case SYNCHRONIZE_CACHE:
2988 case 0x91: /* SYNCHRONIZE_CACHE_16: */
2989 /*
2990 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2991 */
2992 if (cdb[0] == SYNCHRONIZE_CACHE) {
2993 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 2994 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2995 } else {
2996 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 2997 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2998 }
2999 if (sector_ret)
3000 goto out_unsupported_cdb;
3001
3002 size = transport_get_size(sectors, cdb, cmd);
3003 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3004
3005 /*
3006 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3007 */
e3d6f909 3008 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 3009 break;
3010 /*
3011 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3012 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3013 */
3014 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3015 /*
3016 * Check to ensure that LBA + Range does not exceed past end of
7abbe7f3 3017 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
c66ac9db 3018 */
7abbe7f3
NB		 3019 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
3020 if (transport_cmd_get_valid_sectors(cmd) < 0)
3021 goto out_invalid_cdb_field;
3022 }
c66ac9db
NB		 3023 break;
3024 case UNMAP:
3025 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 3026 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3027 break;
3028 case WRITE_SAME_16:
3029 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3030 if (sector_ret)
3031 goto out_unsupported_cdb;
dd3a5ad8 3032
6708bb27 3033 if (sectors)
12850626 3034 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 3035 else {
3036 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3037 goto out_invalid_cdb_field;
3038 }
dd3a5ad8 3039
5db0753b 3040 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
706d5860
NB		 3041 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3042
3043 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3044 goto out_invalid_cdb_field;
3045 break;
3046 case WRITE_SAME:
3047 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3048 if (sector_ret)
3049 goto out_unsupported_cdb;
3050
3051 if (sectors)
12850626 3052 size = transport_get_size(1, cdb, cmd);
706d5860
NB		 3053 else {
3054 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3055 goto out_invalid_cdb_field;
c66ac9db 3056 }
706d5860
NB		 3057
3058 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
c66ac9db 3059 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
706d5860
NB		 3060 /*
3061 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3062 * of byte 1 bit 3 UNMAP instead of original reserved field
3063 */
3064 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3065 goto out_invalid_cdb_field;
c66ac9db
NB		 3066 break;
3067 case ALLOW_MEDIUM_REMOVAL:
3068 case GPCMD_CLOSE_TRACK:
3069 case ERASE:
3070 case INITIALIZE_ELEMENT_STATUS:
3071 case GPCMD_LOAD_UNLOAD:
3072 case REZERO_UNIT:
3073 case SEEK_10:
3074 case GPCMD_SET_SPEED:
3075 case SPACE:
3076 case START_STOP:
3077 case TEST_UNIT_READY:
3078 case VERIFY:
3079 case WRITE_FILEMARKS:
3080 case MOVE_MEDIUM:
3081 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3082 break;
3083 case REPORT_LUNS:
3084 cmd->transport_emulate_cdb =
e3d6f909 3085 transport_core_report_lun_response;
c66ac9db
NB		 3086 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3087 /*
3088 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3089 * See spc4r17 section 5.3
3090 */
5951146d 3091 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3092 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3093 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3094 break;
3095 default:
6708bb27 3096 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 3097 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3098 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3099 goto out_unsupported_cdb;
3100 }
3101
3102 if (size != cmd->data_length) {
6708bb27 3103 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 3104 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3105 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3106 cmd->data_length, size, cdb[0]);
3107
3108 cmd->cmd_spdtl = size;
3109
3110 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 3111 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 3112 " WRITE data\n");
3113 goto out_invalid_cdb_field;
3114 }
3115 /*
3116 * Reject READ_* or WRITE_* with overflow/underflow for
3117 * type SCF_SCSI_DATA_SG_IO_CDB.
3118 */
6708bb27
AG		 3119 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3120 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 3121 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3122 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3123 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3124 goto out_invalid_cdb_field;
3125 }
3126
3127 if (size > cmd->data_length) {
3128 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3129 cmd->residual_count = (size - cmd->data_length);
3130 } else {
3131 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3132 cmd->residual_count = (cmd->data_length - size);
3133 }
3134 cmd->data_length = size;
3135 }
3136
d0229ae3
AG		 3137 /* Let's limit control cdbs to a page, for simplicity's sake. */
3138 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3139 size > PAGE_SIZE)
3140 goto out_invalid_cdb_field;
3141
c66ac9db
NB		 3142 transport_set_supported_SAM_opcode(cmd);
3143 return ret;
3144
3145out_unsupported_cdb:
3146 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3147 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3148 return -EINVAL;
c66ac9db
NB		 3149out_invalid_cdb_field:
3150 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3151 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3152 return -EINVAL;
c66ac9db
NB		 3153}
3154
c66ac9db 3155/*
35e0e757 3156 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 3157 * and ordered cmds need to have their tasks added to the execution queue.
3158 */
3159static void transport_complete_task_attr(struct se_cmd *cmd)
3160{
5951146d 3161 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3162 struct se_cmd *cmd_p, *cmd_tmp;
3163 int new_active_tasks = 0;
3164
e66ecd50 3165 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3166 atomic_dec(&dev->simple_cmds);
3167 smp_mb__after_atomic_dec();
3168 dev->dev_cur_ordered_id++;
6708bb27 3169 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3170 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3171 cmd->se_ordered_id);
e66ecd50 3172 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 3173 atomic_dec(&dev->dev_hoq_count);
3174 smp_mb__after_atomic_dec();
3175 dev->dev_cur_ordered_id++;
6708bb27 3176 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3177 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3178 cmd->se_ordered_id);
e66ecd50 3179 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db 3180 spin_lock(&dev->ordered_cmd_lock);
5951146d 3181 list_del(&cmd->se_ordered_node);
c66ac9db
NB		 3182 atomic_dec(&dev->dev_ordered_sync);
3183 smp_mb__after_atomic_dec();
3184 spin_unlock(&dev->ordered_cmd_lock);
3185
3186 dev->dev_cur_ordered_id++;
6708bb27 3187 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3188 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3189 }
3190 /*
3191 * Process all commands up to the last received
3192 * ORDERED task attribute which requires another blocking
3193 * boundary
3194 */
3195 spin_lock(&dev->delayed_cmd_lock);
3196 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3197 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3198
5951146d 3199 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3200 spin_unlock(&dev->delayed_cmd_lock);
3201
6708bb27 3202 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3203 " cmd_p: 0x%02x Task Attr: 0x%02x"
3204 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3205 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3206 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3207
3208 transport_add_tasks_from_cmd(cmd_p);
3209 new_active_tasks++;
3210
3211 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3212 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3213 break;
3214 }
3215 spin_unlock(&dev->delayed_cmd_lock);
3216 /*
3217 * If new tasks have become active, wake up the transport thread
3218 * to do the processing of the Active tasks.
3219 */
3220 if (new_active_tasks != 0)
e3d6f909 3221 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3222}
3223
e057f533 3224static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 3225{
3226 int ret = 0;
3227
e057f533
CH		 3228 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3229 transport_complete_task_attr(cmd);
3230
3231 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3232 ret = cmd->se_tfo->queue_status(cmd);
3233 if (ret)
3234 goto out;
3235 }
07bde79a
NB		 3236
3237 switch (cmd->data_direction) {
3238 case DMA_FROM_DEVICE:
3239 ret = cmd->se_tfo->queue_data_in(cmd);
3240 break;
3241 case DMA_TO_DEVICE:
ec98f782 3242 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3243 ret = cmd->se_tfo->queue_data_in(cmd);
3244 if (ret < 0)
e057f533 3245 break;
07bde79a
NB		 3246 }
3247 /* Fall through for DMA_TO_DEVICE */
3248 case DMA_NONE:
3249 ret = cmd->se_tfo->queue_status(cmd);
3250 break;
3251 default:
3252 break;
3253 }
3254
e057f533
CH		 3255out:
3256 if (ret < 0) {
3257 transport_handle_queue_full(cmd, cmd->se_dev);
3258 return;
3259 }
3260 transport_lun_remove_cmd(cmd);
3261 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3262}
3263
3264static void transport_handle_queue_full(
3265 struct se_cmd *cmd,
e057f533 3266 struct se_device *dev)
07bde79a
NB		 3267{
3268 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 3269 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3270 atomic_inc(&dev->dev_qf_count);
3271 smp_mb__after_atomic_inc();
3272 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3273
3274 schedule_work(&cmd->se_dev->qf_work_queue);
3275}
3276
35e0e757 3277static void target_complete_ok_work(struct work_struct *work)
c66ac9db 3278{
35e0e757 3279 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
07bde79a 3280 int reason = 0, ret;
35e0e757 3281
c66ac9db
NB		 3282 /*
3283 * Check if we need to move delayed/dormant tasks from cmds on the
3284 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3285 * Attribute.
3286 */
5951146d 3287 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3288 transport_complete_task_attr(cmd);
07bde79a
NB		 3289 /*
3290 * Check to schedule QUEUE_FULL work, or execute an existing
3291 * cmd->transport_qf_callback()
3292 */
3293 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3294 schedule_work(&cmd->se_dev->qf_work_queue);
3295
c66ac9db
NB		 3296 /*
3297 * Check if we need to retrieve a sense buffer from
3298 * the struct se_cmd in question.
3299 */
3300 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3301 if (transport_get_sense_data(cmd) < 0)
3302 reason = TCM_NON_EXISTENT_LUN;
3303
3304 /*
3305 * Only set when an struct se_task->task_scsi_status returned
3306 * a non GOOD status.
3307 */
3308 if (cmd->scsi_status) {
07bde79a 3309 ret = transport_send_check_condition_and_sense(
c66ac9db 3310 cmd, reason, 1);
07bde79a
NB		 3311 if (ret == -EAGAIN)
3312 goto queue_full;
3313
c66ac9db
NB		 3314 transport_lun_remove_cmd(cmd);
3315 transport_cmd_check_stop_to_fabric(cmd);
3316 return;
3317 }
3318 }
3319 /*
25985edc 3320 * Check for a callback, used by amongst other things
c66ac9db
NB		 3321 * XDWRITE_READ_10 emulation.
3322 */
3323 if (cmd->transport_complete_callback)
3324 cmd->transport_complete_callback(cmd);
3325
3326 switch (cmd->data_direction) {
3327 case DMA_FROM_DEVICE:
3328 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3329 if (cmd->se_lun->lun_sep) {
3330 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3331 cmd->data_length;
3332 }
3333 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3334
07bde79a
NB		 3335 ret = cmd->se_tfo->queue_data_in(cmd);
3336 if (ret == -EAGAIN)
3337 goto queue_full;
c66ac9db
NB		 3338 break;
3339 case DMA_TO_DEVICE:
3340 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3341 if (cmd->se_lun->lun_sep) {
3342 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3343 cmd->data_length;
3344 }
3345 spin_unlock(&cmd->se_lun->lun_sep_lock);
3346 /*
3347 * Check if we need to send READ payload for BIDI-COMMAND
3348 */
ec98f782 3349 if (cmd->t_bidi_data_sg) {
c66ac9db 3350 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3351 if (cmd->se_lun->lun_sep) {
3352 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3353 cmd->data_length;
3354 }
3355 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a
NB		 3356 ret = cmd->se_tfo->queue_data_in(cmd);
3357 if (ret == -EAGAIN)
3358 goto queue_full;
c66ac9db
NB		 3359 break;
3360 }
3361 /* Fall through for DMA_TO_DEVICE */
3362 case DMA_NONE:
07bde79a
NB		 3363 ret = cmd->se_tfo->queue_status(cmd);
3364 if (ret == -EAGAIN)
3365 goto queue_full;
c66ac9db
NB		 3366 break;
3367 default:
3368 break;
3369 }
3370
3371 transport_lun_remove_cmd(cmd);
3372 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3373 return;
3374
3375queue_full:
6708bb27 3376 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 3377 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 3378 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3379 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 3380}
3381
3382static void transport_free_dev_tasks(struct se_cmd *cmd)
3383{
3384 struct se_task *task, *task_tmp;
3385 unsigned long flags;
0c2cfe5f 3386 LIST_HEAD(dispose_list);
c66ac9db 3387
a1d8b49a 3388 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3389 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3390 &cmd->t_task_list, t_list) {
0c2cfe5f
CH		 3391 if (!(task->task_flags & TF_ACTIVE))
3392 list_move_tail(&task->t_list, &dispose_list);
3393 }
3394 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3395
3396 while (!list_empty(&dispose_list)) {
3397 task = list_first_entry(&dispose_list, struct se_task, t_list);
c66ac9db 3398
af3f00c7
CH		 3399 if (task->task_sg != cmd->t_data_sg &&
3400 task->task_sg != cmd->t_bidi_data_sg)
3401 kfree(task->task_sg);
c66ac9db
NB		 3402
3403 list_del(&task->t_list);
3404
42bf829e 3405 cmd->se_dev->transport->free_task(task);
c66ac9db 3406 }
c66ac9db
NB		 3407}
3408
6708bb27 3409static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3410{
ec98f782 3411 struct scatterlist *sg;
ec98f782 3412 int count;
c66ac9db 3413
6708bb27
AG		 3414 for_each_sg(sgl, sg, nents, count)
3415 __free_page(sg_page(sg));
c66ac9db 3416
6708bb27
AG		 3417 kfree(sgl);
3418}
c66ac9db 3419
6708bb27
AG		 3420static inline void transport_free_pages(struct se_cmd *cmd)
3421{
3422 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3423 return;
3424
3425 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3426 cmd->t_data_sg = NULL;
3427 cmd->t_data_nents = 0;
c66ac9db 3428
6708bb27 3429 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3430 cmd->t_bidi_data_sg = NULL;
3431 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3432}
3433
d3df7825
CH		 3434/**
3435 * transport_put_cmd - release a reference to a command
3436 * @cmd: command to release
3437 *
3438 * This routine releases our reference to the command and frees it if possible.
3439 */
39c05f32 3440static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 3441{
3442 unsigned long flags;
4911e3cc 3443 int free_tasks = 0;
c66ac9db 3444
a1d8b49a 3445 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 3446 if (atomic_read(&cmd->t_fe_count)) {
3447 if (!atomic_dec_and_test(&cmd->t_fe_count))
3448 goto out_busy;
3449 }
3450
3451 if (atomic_read(&cmd->t_se_count)) {
3452 if (!atomic_dec_and_test(&cmd->t_se_count))
3453 goto out_busy;
3454 }
3455
3456 if (atomic_read(&cmd->transport_dev_active)) {
3457 atomic_set(&cmd->transport_dev_active, 0);
3458 transport_all_task_dev_remove_state(cmd);
3459 free_tasks = 1;
c66ac9db 3460 }
a1d8b49a 3461 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3462
4911e3cc
CH		 3463 if (free_tasks != 0)
3464 transport_free_dev_tasks(cmd);
d3df7825 3465
c66ac9db 3466 transport_free_pages(cmd);
31afc39c 3467 transport_release_cmd(cmd);
39c05f32 3468 return;
4911e3cc
CH		 3469out_busy:
3470 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3471}
3472
c66ac9db 3473/*
ec98f782
AG		 3474 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3475 * allocating in the core.
c66ac9db
NB		 3476 * @cmd: Associated se_cmd descriptor
3477 * @mem: SGL style memory for TCM WRITE / READ
3478 * @sg_mem_num: Number of SGL elements
3479 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3480 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3481 *
3482 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3483 * of parameters.
3484 */
3485int transport_generic_map_mem_to_cmd(
3486 struct se_cmd *cmd,
5951146d
AG		 3487 struct scatterlist *sgl,
3488 u32 sgl_count,
3489 struct scatterlist *sgl_bidi,
3490 u32 sgl_bidi_count)
c66ac9db 3491{
5951146d 3492 if (!sgl || !sgl_count)
c66ac9db 3493 return 0;
c66ac9db 3494
c66ac9db
NB		 3495 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3496 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
c66ac9db 3497
ec98f782
AG		 3498 cmd->t_data_sg = sgl;
3499 cmd->t_data_nents = sgl_count;
c66ac9db 3500
ec98f782
AG		 3501 if (sgl_bidi && sgl_bidi_count) {
3502 cmd->t_bidi_data_sg = sgl_bidi;
3503 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3504 }
3505 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3506 }
3507
3508 return 0;
3509}
3510EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3511
05d1c7c0
AG		 3512void *transport_kmap_first_data_page(struct se_cmd *cmd)
3513{
ec98f782 3514 struct scatterlist *sg = cmd->t_data_sg;
05d1c7c0 3515
ec98f782 3516 BUG_ON(!sg);
05d1c7c0 3517 /*
ec98f782
AG		 3518 * We need to take into account a possible offset here for fabrics like
3519 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3520 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3521 */
ec98f782 3522 return kmap(sg_page(sg)) + sg->offset;
05d1c7c0
AG		 3523}
3524EXPORT_SYMBOL(transport_kmap_first_data_page);
3525
3526void transport_kunmap_first_data_page(struct se_cmd *cmd)
3527{
ec98f782 3528 kunmap(sg_page(cmd->t_data_sg));
05d1c7c0
AG		 3529}
3530EXPORT_SYMBOL(transport_kunmap_first_data_page);
3531
c66ac9db 3532static int
05d1c7c0 3533transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3534{
ec98f782
AG		 3535 u32 length = cmd->data_length;
3536 unsigned int nents;
3537 struct page *page;
3538 int i = 0;
c66ac9db 3539
ec98f782
AG		 3540 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3541 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3542 if (!cmd->t_data_sg)
3543 return -ENOMEM;
c66ac9db 3544
ec98f782
AG		 3545 cmd->t_data_nents = nents;
3546 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3547
ec98f782
AG		 3548 while (length) {
3549 u32 page_len = min_t(u32, length, PAGE_SIZE);
3550 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3551 if (!page)
3552 goto out;
c66ac9db 3553
ec98f782
AG		 3554 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3555 length -= page_len;
3556 i++;
c66ac9db 3557 }
c66ac9db 3558 return 0;
c66ac9db 3559
ec98f782
AG		 3560out:
3561 while (i >= 0) {
3562 __free_page(sg_page(&cmd->t_data_sg[i]));
3563 i--;
c66ac9db 3564 }
ec98f782
AG		 3565 kfree(cmd->t_data_sg);
3566 cmd->t_data_sg = NULL;
3567 return -ENOMEM;
c66ac9db
NB		 3568}
3569
a1d8b49a
AG		 3570/* Reduce sectors if they are too long for the device */
3571static inline sector_t transport_limit_task_sectors(
c66ac9db
NB		 3572 struct se_device *dev,
3573 unsigned long long lba,
a1d8b49a 3574 sector_t sectors)
c66ac9db 3575{
a1d8b49a 3576 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db 3577
a1d8b49a
AG		 3578 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3579 if ((lba + sectors) > transport_dev_end_lba(dev))
3580 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
c66ac9db 3581
a1d8b49a 3582 return sectors;
c66ac9db
NB		 3583}
3584
c66ac9db
NB		 3585
3586/*
3587 * This function can be used by HW target mode drivers to create a linked
3588 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3589 * This is intended to be called during the completion path by TCM Core
3590 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3591 */
3592void transport_do_task_sg_chain(struct se_cmd *cmd)
3593{
ec98f782
AG		 3594 struct scatterlist *sg_first = NULL;
3595 struct scatterlist *sg_prev = NULL;
3596 int sg_prev_nents = 0;
3597 struct scatterlist *sg;
c66ac9db 3598 struct se_task *task;
ec98f782 3599 u32 chained_nents = 0;
c66ac9db
NB		 3600 int i;
3601
ec98f782
AG		 3602 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3603
c66ac9db
NB		 3604 /*
3605 * Walk the struct se_task list and setup scatterlist chains
a1d8b49a 3606 * for each contiguously allocated struct se_task->task_sg[].
c66ac9db 3607 */
a1d8b49a 3608 list_for_each_entry(task, &cmd->t_task_list, t_list) {
ec98f782 3609 if (!task->task_sg)
c66ac9db
NB		 3610 continue;
3611
ec98f782
AG		 3612 if (!sg_first) {
3613 sg_first = task->task_sg;
6708bb27 3614 chained_nents = task->task_sg_nents;
97868c89 3615 } else {
ec98f782 3616 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
6708bb27 3617 chained_nents += task->task_sg_nents;
97868c89 3618 }
c3c74c7a
NB		 3619 /*
3620 * For the padded tasks, use the extra SGL vector allocated
3621 * in transport_allocate_data_tasks() for the sg_prev_nents
04629b7b
CH		 3622 * offset into sg_chain() above.
3623 *
3624 * We do not need the padding for the last task (or a single
3625 * task), but in that case we will never use the sg_prev_nents
3626 * value below which would be incorrect.
c3c74c7a 3627 */
04629b7b 3628 sg_prev_nents = (task->task_sg_nents + 1);
ec98f782 3629 sg_prev = task->task_sg;
c66ac9db
NB		 3630 }
3631 /*
3632 * Setup the starting pointer and total t_tasks_sg_linked_no including
3633 * padding SGs for linking and to mark the end.
3634 */
a1d8b49a 3635 cmd->t_tasks_sg_chained = sg_first;
ec98f782 3636 cmd->t_tasks_sg_chained_no = chained_nents;
c66ac9db 3637
6708bb27 3638 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
a1d8b49a
AG		 3639 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3640 cmd->t_tasks_sg_chained_no);
c66ac9db 3641
a1d8b49a
AG		 3642 for_each_sg(cmd->t_tasks_sg_chained, sg,
3643 cmd->t_tasks_sg_chained_no, i) {
c66ac9db 3644
6708bb27 3645 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
5951146d 3646 i, sg, sg_page(sg), sg->length, sg->offset);
c66ac9db 3647 if (sg_is_chain(sg))
6708bb27 3648 pr_debug("SG: %p sg_is_chain=1\n", sg);
c66ac9db 3649 if (sg_is_last(sg))
6708bb27 3650 pr_debug("SG: %p sg_is_last=1\n", sg);
c66ac9db 3651 }
c66ac9db
NB		 3652}
3653EXPORT_SYMBOL(transport_do_task_sg_chain);
3654
a1d8b49a
AG		 3655/*
3656 * Break up cmd into chunks transport can handle
3657 */
38b40067
CH		 3658static int
3659transport_allocate_data_tasks(struct se_cmd *cmd,
c66ac9db 3660 enum dma_data_direction data_direction,
38b40067 3661 struct scatterlist *cmd_sg, unsigned int sgl_nents)
c66ac9db 3662{
5951146d 3663 struct se_device *dev = cmd->se_dev;
a3eedc22 3664 int task_count, i;
38b40067
CH		 3665 unsigned long long lba;
3666 sector_t sectors, dev_max_sectors;
3667 u32 sector_size;
3668
3669 if (transport_cmd_get_valid_sectors(cmd) < 0)
3670 return -EINVAL;
3671
3672 dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3673 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
a1d8b49a 3674
ec98f782 3675 WARN_ON(cmd->data_length % sector_size);
38b40067
CH		 3676
3677 lba = cmd->t_task_lba;
ec98f782 3678 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
277c5f27 3679 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
af3f00c7
CH		 3680
3681 /*
3682 * If we need just a single task reuse the SG list in the command
3683 * and avoid a lot of work.
3684 */
3685 if (task_count == 1) {
3686 struct se_task *task;
3687 unsigned long flags;
3688
3689 task = transport_generic_get_task(cmd, data_direction);
3690 if (!task)
3691 return -ENOMEM;
3692
3693 task->task_sg = cmd_sg;
3694 task->task_sg_nents = sgl_nents;
3695
3696 task->task_lba = lba;
3697 task->task_sectors = sectors;
3698 task->task_size = task->task_sectors * sector_size;
3699
3700 spin_lock_irqsave(&cmd->t_state_lock, flags);
3701 list_add_tail(&task->t_list, &cmd->t_task_list);
3702 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3703
3704 return task_count;
3705 }
3706
ec98f782 3707 for (i = 0; i < task_count; i++) {
38b40067 3708 struct se_task *task;
c3c74c7a 3709 unsigned int task_size, task_sg_nents_padded;
38b40067
CH		 3710 struct scatterlist *sg;
3711 unsigned long flags;
ec98f782 3712 int count;
a1d8b49a 3713
c66ac9db 3714 task = transport_generic_get_task(cmd, data_direction);
a1d8b49a 3715 if (!task)
ec98f782 3716 return -ENOMEM;
c66ac9db 3717
c66ac9db 3718 task->task_lba = lba;
ec98f782
AG		 3719 task->task_sectors = min(sectors, dev_max_sectors);
3720 task->task_size = task->task_sectors * sector_size;
c66ac9db 3721
525a48a2
NB		 3722 /*
3723 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3724 * in order to calculate the number per task SGL entries
3725 */
3726 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
c66ac9db 3727 /*
ec98f782
AG		 3728 * Check if the fabric module driver is requesting that all
3729 * struct se_task->task_sg[] be chained together.. If so,
3730 * then allocate an extra padding SG entry for linking and
c3c74c7a
NB		 3731 * marking the end of the chained SGL for every task except
3732 * the last one for (task_count > 1) operation, or skipping
3733 * the extra padding for the (task_count == 1) case.
c66ac9db 3734 */
c3c74c7a
NB		 3735 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3736 task_sg_nents_padded = (task->task_sg_nents + 1);
c3c74c7a
NB		 3737 } else
3738 task_sg_nents_padded = task->task_sg_nents;
c66ac9db 3739
1d20bb61 3740 task->task_sg = kmalloc(sizeof(struct scatterlist) *
c3c74c7a 3741 task_sg_nents_padded, GFP_KERNEL);
ec98f782
AG		 3742 if (!task->task_sg) {
3743 cmd->se_dev->transport->free_task(task);
3744 return -ENOMEM;
3745 }
3746
c3c74c7a 3747 sg_init_table(task->task_sg, task_sg_nents_padded);
c66ac9db 3748
ec98f782
AG		 3749 task_size = task->task_size;
3750
3751 /* Build new sgl, only up to task_size */
6708bb27 3752 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
ec98f782
AG		 3753 if (cmd_sg->length > task_size)
3754 break;
3755
3756 *sg = *cmd_sg;
3757 task_size -= cmd_sg->length;
3758 cmd_sg = sg_next(cmd_sg);
c66ac9db 3759 }
c66ac9db 3760
ec98f782
AG		 3761 lba += task->task_sectors;
3762 sectors -= task->task_sectors;
c66ac9db 3763
ec98f782
AG		 3764 spin_lock_irqsave(&cmd->t_state_lock, flags);
3765 list_add_tail(&task->t_list, &cmd->t_task_list);
3766 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3767 }
3768
ec98f782 3769 return task_count;
c66ac9db
NB		 3770}
3771
3772static int
ec98f782 3773transport_allocate_control_task(struct se_cmd *cmd)
c66ac9db 3774{
c66ac9db 3775 struct se_task *task;
ec98f782 3776 unsigned long flags;
c66ac9db
NB		 3777
3778 task = transport_generic_get_task(cmd, cmd->data_direction);
3779 if (!task)
ec98f782 3780 return -ENOMEM;
c66ac9db 3781
af3f00c7 3782 task->task_sg = cmd->t_data_sg;
c66ac9db 3783 task->task_size = cmd->data_length;
6708bb27 3784 task->task_sg_nents = cmd->t_data_nents;
c66ac9db 3785
ec98f782
AG		 3786 spin_lock_irqsave(&cmd->t_state_lock, flags);
3787 list_add_tail(&task->t_list, &cmd->t_task_list);
3788 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3789
6708bb27 3790 /* Success! Return number of tasks allocated */
a3eedc22 3791 return 1;
ec98f782
AG		 3792}
3793
da0f7619
CH		 3794/*
3795 * Allocate any required ressources to execute the command, and either place
3796 * it on the execution queue if possible. For writes we might not have the
3797 * payload yet, thus notify the fabric via a call to ->write_pending instead.
c66ac9db 3798 */
a1d8b49a 3799int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 3800{
da0f7619 3801 struct se_device *dev = cmd->se_dev;
9ac54987 3802 int task_cdbs, task_cdbs_bidi = 0;
da0f7619 3803 int set_counts = 1;
c66ac9db
NB		 3804 int ret = 0;
3805
3806 /*
3807 * Determine is the TCM fabric module has already allocated physical
3808 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 3809 * beforehand.
c66ac9db 3810 */
ec98f782
AG		 3811 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3812 cmd->data_length) {
05d1c7c0 3813 ret = transport_generic_get_mem(cmd);
c66ac9db
NB		 3814 if (ret < 0)
3815 return ret;
3816 }
da0f7619 3817
1d20bb61 3818 /*
38b40067 3819 * For BIDI command set up the read tasks first.
1d20bb61 3820 */
da0f7619 3821 if (cmd->t_bidi_data_sg &&
38b40067
CH		 3822 dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
3823 BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB));
3824
9ac54987
NB		 3825 task_cdbs_bidi = transport_allocate_data_tasks(cmd,
3826 DMA_FROM_DEVICE, cmd->t_bidi_data_sg,
3827 cmd->t_bidi_data_nents);
3828 if (task_cdbs_bidi <= 0)
da0f7619
CH		 3829 goto out_fail;
3830
3831 atomic_inc(&cmd->t_fe_count);
3832 atomic_inc(&cmd->t_se_count);
3833 set_counts = 0;
3834 }
38b40067
CH		 3835
3836 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3837 task_cdbs = transport_allocate_data_tasks(cmd,
3838 cmd->data_direction, cmd->t_data_sg,
3839 cmd->t_data_nents);
3840 } else {
3841 task_cdbs = transport_allocate_control_task(cmd);
3842 }
3843
da0f7619
CH		 3844 if (task_cdbs <= 0)
3845 goto out_fail;
3846
3847 if (set_counts) {
3848 atomic_inc(&cmd->t_fe_count);
3849 atomic_inc(&cmd->t_se_count);
3850 }
3851
9ac54987
NB		 3852 cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi);
3853 atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num);
3854 atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num);
da0f7619 3855
c66ac9db 3856 /*
a1d8b49a 3857 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 3858 * This WRITE struct se_cmd (and all of its associated struct se_task's)
3859 * will be added to the struct se_device execution queue after its WRITE
3860 * data has arrived. (ie: It gets handled by the transport processing
3861 * thread a second time)
3862 */
3863 if (cmd->data_direction == DMA_TO_DEVICE) {
3864 transport_add_tasks_to_state_queue(cmd);
3865 return transport_generic_write_pending(cmd);
3866 }
3867 /*
3868 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
3869 * to the execution queue.
3870 */
3871 transport_execute_tasks(cmd);
3872 return 0;
da0f7619
CH		 3873
3874out_fail:
3875 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3876 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3877 return -EINVAL;
c66ac9db 3878}
a1d8b49a 3879EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 3880
3881/* transport_generic_process_write():
3882 *
3883 *
3884 */
3885void transport_generic_process_write(struct se_cmd *cmd)
3886{
c66ac9db
NB		 3887 transport_execute_tasks(cmd);
3888}
3889EXPORT_SYMBOL(transport_generic_process_write);
3890
e057f533 3891static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 3892{
e057f533
CH		 3893 if (cmd->se_tfo->write_pending(cmd) == -EAGAIN) {
3894 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3895 cmd);
3896 transport_handle_queue_full(cmd, cmd->se_dev);
3897 }
07bde79a
NB		 3898}
3899
c66ac9db
NB		 3900static int transport_generic_write_pending(struct se_cmd *cmd)
3901{
3902 unsigned long flags;
3903 int ret;
3904
a1d8b49a 3905 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3906 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 3907 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a 3908
c66ac9db
NB		 3909 /*
3910 * Clear the se_cmd for WRITE_PENDING status in order to set
a1d8b49a 3911 * cmd->t_transport_active=0 so that transport_generic_handle_data
c66ac9db 3912 * can be called from HW target mode interrupt code. This is safe
e3d6f909 3913 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 3914 * because the se_cmd->se_lun pointer is not being cleared.
3915 */
3916 transport_cmd_check_stop(cmd, 1, 0);
3917
3918 /*
3919 * Call the fabric write_pending function here to let the
3920 * frontend know that WRITE buffers are ready.
3921 */
e3d6f909 3922 ret = cmd->se_tfo->write_pending(cmd);
07bde79a
NB		 3923 if (ret == -EAGAIN)
3924 goto queue_full;
3925 else if (ret < 0)
c66ac9db
NB		 3926 return ret;
3927
3928 return PYX_TRANSPORT_WRITE_PENDING;
07bde79a
NB		 3929
3930queue_full:
6708bb27 3931 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a 3932 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
e057f533 3933 transport_handle_queue_full(cmd, cmd->se_dev);
07bde79a 3934 return ret;
c66ac9db
NB		 3935}
3936
2dbc43d2
CH		 3937/**
3938 * transport_release_cmd - free a command
3939 * @cmd: command to free
3940 *
3941 * This routine unconditionally frees a command, and reference counting
3942 * or list removal must be done in the caller.
3943 */
35462975 3944void transport_release_cmd(struct se_cmd *cmd)
c66ac9db 3945{
e3d6f909 3946 BUG_ON(!cmd->se_tfo);
c66ac9db 3947
2dbc43d2
CH		 3948 if (cmd->se_tmr_req)
3949 core_tmr_release_req(cmd->se_tmr_req);
3950 if (cmd->t_task_cdb != cmd->__t_task_cdb)
3951 kfree(cmd->t_task_cdb);
35462975 3952 cmd->se_tfo->release_cmd(cmd);
c66ac9db 3953}
35462975 3954EXPORT_SYMBOL(transport_release_cmd);
c66ac9db 3955
39c05f32 3956void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 3957{
d14921d6
NB		 3958 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
3959 if (wait_for_tasks && cmd->se_tmr_req)
3960 transport_wait_for_tasks(cmd);
3961
35462975 3962 transport_release_cmd(cmd);
d14921d6
NB		 3963 } else {
3964 if (wait_for_tasks)
3965 transport_wait_for_tasks(cmd);
3966
c66ac9db
NB		 3967 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3968
82f1c8a4 3969 if (cmd->se_lun)
c66ac9db 3970 transport_lun_remove_cmd(cmd);
c66ac9db 3971
f4366772
NB		 3972 transport_free_dev_tasks(cmd);
3973
39c05f32 3974 transport_put_cmd(cmd);
c66ac9db
NB		 3975 }
3976}
3977EXPORT_SYMBOL(transport_generic_free_cmd);
3978
c66ac9db
NB		 3979/* transport_lun_wait_for_tasks():
3980 *
3981 * Called from ConfigFS context to stop the passed struct se_cmd to allow
3982 * an struct se_lun to be successfully shutdown.
3983 */
3984static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
3985{
3986 unsigned long flags;
3987 int ret;
3988 /*
3989 * If the frontend has already requested this struct se_cmd to
3990 * be stopped, we can safely ignore this struct se_cmd.
3991 */
a1d8b49a
AG		 3992 spin_lock_irqsave(&cmd->t_state_lock, flags);
3993 if (atomic_read(&cmd->t_transport_stop)) {
3994 atomic_set(&cmd->transport_lun_stop, 0);
6708bb27 3995 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
e3d6f909 3996 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 3997 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3998 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 3999 return -EPERM;
c66ac9db 4000 }
a1d8b49a
AG		 4001 atomic_set(&cmd->transport_lun_fe_stop, 1);
4002 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4003
5951146d 4004 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 4005
4006 ret = transport_stop_tasks_for_cmd(cmd);
4007
6708bb27
AG		 4008 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4009 " %d\n", cmd, cmd->t_task_list_num, ret);
c66ac9db 4010 if (!ret) {
6708bb27 4011 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 4012 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4013 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 4014 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 4015 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4016 }
3df8d40b 4017 transport_remove_cmd_from_queue(cmd);
c66ac9db
NB		 4018
4019 return 0;
4020}
4021
c66ac9db
NB		 4022static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4023{
4024 struct se_cmd *cmd = NULL;
4025 unsigned long lun_flags, cmd_flags;
4026 /*
4027 * Do exception processing and return CHECK_CONDITION status to the
4028 * Initiator Port.
4029 */
4030 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 4031 while (!list_empty(&lun->lun_cmd_list)) {
4032 cmd = list_first_entry(&lun->lun_cmd_list,
4033 struct se_cmd, se_lun_node);
4034 list_del(&cmd->se_lun_node);
4035
a1d8b49a 4036 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db
NB		 4037 /*
4038 * This will notify iscsi_target_transport.c:
4039 * transport_cmd_check_stop() that a LUN shutdown is in
4040 * progress for the iscsi_cmd_t.
4041 */
a1d8b49a 4042 spin_lock(&cmd->t_state_lock);
6708bb27 4043 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 4044 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 4045 cmd->se_lun->unpacked_lun,
4046 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a
AG		 4047 atomic_set(&cmd->transport_lun_stop, 1);
4048 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 4049
4050 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4051
6708bb27
AG		 4052 if (!cmd->se_lun) {
4053 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 4054 cmd->se_tfo->get_task_tag(cmd),
4055 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 4056 BUG();
4057 }
4058 /*
4059 * If the Storage engine still owns the iscsi_cmd_t, determine
4060 * and/or stop its context.
4061 */
6708bb27 4062 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 4063 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4064 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4065
e3d6f909 4066 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 4067 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4068 continue;
4069 }
4070
6708bb27 4071 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 4072 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 4073 cmd->se_lun->unpacked_lun,
4074 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4075
a1d8b49a 4076 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
6708bb27 4077 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 4078 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4079 goto check_cond;
4080 }
a1d8b49a 4081 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 4082 transport_all_task_dev_remove_state(cmd);
a1d8b49a 4083 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4084
4085 transport_free_dev_tasks(cmd);
4086 /*
4087 * The Storage engine stopped this struct se_cmd before it was
4088 * send to the fabric frontend for delivery back to the
4089 * Initiator Node. Return this SCSI CDB back with an
4090 * CHECK_CONDITION status.
4091 */
4092check_cond:
4093 transport_send_check_condition_and_sense(cmd,
4094 TCM_NON_EXISTENT_LUN, 0);
4095 /*
4096 * If the fabric frontend is waiting for this iscsi_cmd_t to
4097 * be released, notify the waiting thread now that LU has
4098 * finished accessing it.
4099 */
a1d8b49a
AG		 4100 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4101 if (atomic_read(&cmd->transport_lun_fe_stop)) {
6708bb27 4102 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 4103 " struct se_cmd: %p ITT: 0x%08x\n",
4104 lun->unpacked_lun,
e3d6f909 4105 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4106
a1d8b49a 4107 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 4108 cmd_flags);
4109 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 4110 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 4111 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4112 continue;
4113 }
6708bb27 4114 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 4115 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4116
a1d8b49a 4117 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4118 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4119 }
4120 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4121}
4122
4123static int transport_clear_lun_thread(void *p)
4124{
4125 struct se_lun *lun = (struct se_lun *)p;
4126
4127 __transport_clear_lun_from_sessions(lun);
4128 complete(&lun->lun_shutdown_comp);
4129
4130 return 0;
4131}
4132
4133int transport_clear_lun_from_sessions(struct se_lun *lun)
4134{
4135 struct task_struct *kt;
4136
5951146d 4137 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 4138 "tcm_cl_%u", lun->unpacked_lun);
4139 if (IS_ERR(kt)) {
6708bb27 4140 pr_err("Unable to start clear_lun thread\n");
e3d6f909 4141 return PTR_ERR(kt);
c66ac9db
NB		 4142 }
4143 wait_for_completion(&lun->lun_shutdown_comp);
4144
4145 return 0;
4146}
4147
d14921d6
NB		 4148/**
4149 * transport_wait_for_tasks - wait for completion to occur
4150 * @cmd: command to wait
c66ac9db 4151 *
d14921d6
NB		 4152 * Called from frontend fabric context to wait for storage engine
4153 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 4154 */
d14921d6 4155void transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 4156{
4157 unsigned long flags;
4158
a1d8b49a 4159 spin_lock_irqsave(&cmd->t_state_lock, flags);
d14921d6
NB		 4160 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4161 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4162 return;
4163 }
4164 /*
4165 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4166 * has been set in transport_set_supported_SAM_opcode().
4167 */
4168 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4169 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4170 return;
4171 }
c66ac9db
NB		 4172 /*
4173 * If we are already stopped due to an external event (ie: LUN shutdown)
4174 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 4175 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 4176 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4177 * has completed its operation on the struct se_cmd.
4178 */
a1d8b49a 4179 if (atomic_read(&cmd->transport_lun_stop)) {
c66ac9db 4180
6708bb27 4181 pr_debug("wait_for_tasks: Stopping"
e3d6f909 4182 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 4183 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 4184 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4185 /*
4186 * There is a special case for WRITES where a FE exception +
4187 * LUN shutdown means ConfigFS context is still sleeping on
4188 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4189 * We go ahead and up transport_lun_stop_comp just to be sure
4190 * here.
4191 */
a1d8b49a
AG		 4192 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4193 complete(&cmd->transport_lun_stop_comp);
4194 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4195 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4196
4197 transport_all_task_dev_remove_state(cmd);
4198 /*
4199 * At this point, the frontend who was the originator of this
4200 * struct se_cmd, now owns the structure and can be released through
4201 * normal means below.
4202 */
6708bb27 4203 pr_debug("wait_for_tasks: Stopped"
e3d6f909 4204 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 4205 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 4206 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4207
a1d8b49a 4208 atomic_set(&cmd->transport_lun_stop, 0);
c66ac9db 4209 }
a1d8b49a 4210 if (!atomic_read(&cmd->t_transport_active) ||
d14921d6
NB		 4211 atomic_read(&cmd->t_transport_aborted)) {
4212 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4213 return;
4214 }
c66ac9db 4215
a1d8b49a 4216 atomic_set(&cmd->t_transport_stop, 1);
c66ac9db 4217
6708bb27 4218 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
f2da9dbd
CH		 4219 " i_state: %d, t_state: %d, t_transport_stop = TRUE\n",
4220 cmd, cmd->se_tfo->get_task_tag(cmd),
4221 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 4222
a1d8b49a 4223 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4224
5951146d 4225 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 4226
a1d8b49a 4227 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 4228
a1d8b49a
AG		 4229 spin_lock_irqsave(&cmd->t_state_lock, flags);
4230 atomic_set(&cmd->t_transport_active, 0);
4231 atomic_set(&cmd->t_transport_stop, 0);
c66ac9db 4232
6708bb27 4233 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4234 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4235 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4236
d14921d6 4237 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4238}
d14921d6 4239EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 4240
4241static int transport_get_sense_codes(
4242 struct se_cmd *cmd,
4243 u8 *asc,
4244 u8 *ascq)
4245{
4246 *asc = cmd->scsi_asc;
4247 *ascq = cmd->scsi_ascq;
4248
4249 return 0;
4250}
4251
4252static int transport_set_sense_codes(
4253 struct se_cmd *cmd,
4254 u8 asc,
4255 u8 ascq)
4256{
4257 cmd->scsi_asc = asc;
4258 cmd->scsi_ascq = ascq;
4259
4260 return 0;
4261}
4262
4263int transport_send_check_condition_and_sense(
4264 struct se_cmd *cmd,
4265 u8 reason,
4266 int from_transport)
4267{
4268 unsigned char *buffer = cmd->sense_buffer;
4269 unsigned long flags;
4270 int offset;
4271 u8 asc = 0, ascq = 0;
4272
a1d8b49a 4273 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4274 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4275 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4276 return 0;
4277 }
4278 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4279 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4280
4281 if (!reason && from_transport)
4282 goto after_reason;
4283
4284 if (!from_transport)
4285 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4286 /*
4287 * Data Segment and SenseLength of the fabric response PDU.
4288 *
4289 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4290 * from include/scsi/scsi_cmnd.h
4291 */
e3d6f909 4292 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4293 TRANSPORT_SENSE_BUFFER);
4294 /*
4295 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4296 * SENSE KEY values from include/scsi/scsi.h
4297 */
4298 switch (reason) {
4299 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4300 /* CURRENT ERROR */
4301 buffer[offset] = 0x70;
4302 /* ILLEGAL REQUEST */
4303 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4304 /* LOGICAL UNIT NOT SUPPORTED */
4305 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4306 break;
c66ac9db
NB		 4307 case TCM_UNSUPPORTED_SCSI_OPCODE:
4308 case TCM_SECTOR_COUNT_TOO_MANY:
4309 /* CURRENT ERROR */
4310 buffer[offset] = 0x70;
4311 /* ILLEGAL REQUEST */
4312 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4313 /* INVALID COMMAND OPERATION CODE */
4314 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4315 break;
4316 case TCM_UNKNOWN_MODE_PAGE:
4317 /* CURRENT ERROR */
4318 buffer[offset] = 0x70;
4319 /* ILLEGAL REQUEST */
4320 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4321 /* INVALID FIELD IN CDB */
4322 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4323 break;
4324 case TCM_CHECK_CONDITION_ABORT_CMD:
4325 /* CURRENT ERROR */
4326 buffer[offset] = 0x70;
4327 /* ABORTED COMMAND */
4328 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4329 /* BUS DEVICE RESET FUNCTION OCCURRED */
4330 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4331 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4332 break;
4333 case TCM_INCORRECT_AMOUNT_OF_DATA:
4334 /* CURRENT ERROR */
4335 buffer[offset] = 0x70;
4336 /* ABORTED COMMAND */
4337 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4338 /* WRITE ERROR */
4339 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4340 /* NOT ENOUGH UNSOLICITED DATA */
4341 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4342 break;
4343 case TCM_INVALID_CDB_FIELD:
4344 /* CURRENT ERROR */
4345 buffer[offset] = 0x70;
4346 /* ABORTED COMMAND */
4347 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4348 /* INVALID FIELD IN CDB */
4349 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4350 break;
4351 case TCM_INVALID_PARAMETER_LIST:
4352 /* CURRENT ERROR */
4353 buffer[offset] = 0x70;
4354 /* ABORTED COMMAND */
4355 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4356 /* INVALID FIELD IN PARAMETER LIST */
4357 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4358 break;
4359 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4360 /* CURRENT ERROR */
4361 buffer[offset] = 0x70;
4362 /* ABORTED COMMAND */
4363 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4364 /* WRITE ERROR */
4365 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4366 /* UNEXPECTED_UNSOLICITED_DATA */
4367 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4368 break;
4369 case TCM_SERVICE_CRC_ERROR:
4370 /* CURRENT ERROR */
4371 buffer[offset] = 0x70;
4372 /* ABORTED COMMAND */
4373 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4374 /* PROTOCOL SERVICE CRC ERROR */
4375 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4376 /* N/A */
4377 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4378 break;
4379 case TCM_SNACK_REJECTED:
4380 /* CURRENT ERROR */
4381 buffer[offset] = 0x70;
4382 /* ABORTED COMMAND */
4383 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4384 /* READ ERROR */
4385 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4386 /* FAILED RETRANSMISSION REQUEST */
4387 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4388 break;
4389 case TCM_WRITE_PROTECTED:
4390 /* CURRENT ERROR */
4391 buffer[offset] = 0x70;
4392 /* DATA PROTECT */
4393 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4394 /* WRITE PROTECTED */
4395 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4396 break;
4397 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4398 /* CURRENT ERROR */
4399 buffer[offset] = 0x70;
4400 /* UNIT ATTENTION */
4401 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4402 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4403 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4404 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4405 break;
4406 case TCM_CHECK_CONDITION_NOT_READY:
4407 /* CURRENT ERROR */
4408 buffer[offset] = 0x70;
4409 /* Not Ready */
4410 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4411 transport_get_sense_codes(cmd, &asc, &ascq);
4412 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4413 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4414 break;
4415 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4416 default:
4417 /* CURRENT ERROR */
4418 buffer[offset] = 0x70;
4419 /* ILLEGAL REQUEST */
4420 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4421 /* LOGICAL UNIT COMMUNICATION FAILURE */
4422 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4423 break;
4424 }
4425 /*
4426 * This code uses linux/include/scsi/scsi.h SAM status codes!
4427 */
4428 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4429 /*
4430 * Automatically padded, this value is encoded in the fabric's
4431 * data_length response PDU containing the SCSI defined sense data.
4432 */
4433 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4434
4435after_reason:
07bde79a 4436 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4437}
4438EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4439
4440int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4441{
4442 int ret = 0;
4443
a1d8b49a 4444 if (atomic_read(&cmd->t_transport_aborted) != 0) {
6708bb27 4445 if (!send_status ||
c66ac9db
NB		 4446 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4447 return 1;
4448#if 0
6708bb27 4449 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4450 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4451 cmd->t_task_cdb[0],
e3d6f909 4452 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4453#endif
4454 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4455 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4456 ret = 1;
4457 }
4458 return ret;
4459}
4460EXPORT_SYMBOL(transport_check_aborted_status);
4461
4462void transport_send_task_abort(struct se_cmd *cmd)
4463{
c252f003
NB		 4464 unsigned long flags;
4465
4466 spin_lock_irqsave(&cmd->t_state_lock, flags);
4467 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4468 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4469 return;
4470 }
4471 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4472
c66ac9db
NB		 4473 /*
4474 * If there are still expected incoming fabric WRITEs, we wait
4475 * until until they have completed before sending a TASK_ABORTED
4476 * response. This response with TASK_ABORTED status will be
4477 * queued back to fabric module by transport_check_aborted_status().
4478 */
4479 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4480 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
a1d8b49a 4481 atomic_inc(&cmd->t_transport_aborted);
c66ac9db
NB		 4482 smp_mb__after_atomic_inc();
4483 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4484 transport_new_cmd_failure(cmd);
4485 return;
4486 }
4487 }
4488 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4489#if 0
6708bb27 4490 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4491 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4492 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4493#endif
e3d6f909 4494 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4495}
4496
4497/* transport_generic_do_tmr():
4498 *
4499 *
4500 */
4501int transport_generic_do_tmr(struct se_cmd *cmd)
4502{
5951146d 4503 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4504 struct se_tmr_req *tmr = cmd->se_tmr_req;
4505 int ret;
4506
4507 switch (tmr->function) {
5c6cd613 4508 case TMR_ABORT_TASK:
c66ac9db
NB		 4509 tmr->response = TMR_FUNCTION_REJECTED;
4510 break;
5c6cd613
NB		 4511 case TMR_ABORT_TASK_SET:
4512 case TMR_CLEAR_ACA:
4513 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4514 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4515 break;
5c6cd613 4516 case TMR_LUN_RESET:
c66ac9db
NB		 4517 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4518 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4519 TMR_FUNCTION_REJECTED;
4520 break;
5c6cd613 4521 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4522 tmr->response = TMR_FUNCTION_REJECTED;
4523 break;
5c6cd613 4524 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4525 tmr->response = TMR_FUNCTION_REJECTED;
4526 break;
c66ac9db 4527 default:
6708bb27 4528 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4529 tmr->function);
4530 tmr->response = TMR_FUNCTION_REJECTED;
4531 break;
4532 }
4533
4534 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4535 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 4536
b7b8bef7 4537 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 4538 return 0;
4539}
4540
c66ac9db
NB		 4541/* transport_processing_thread():
4542 *
4543 *
4544 */
4545static int transport_processing_thread(void *param)
4546{
5951146d 4547 int ret;
c66ac9db
NB		 4548 struct se_cmd *cmd;
4549 struct se_device *dev = (struct se_device *) param;
c66ac9db
NB		 4550
4551 set_user_nice(current, -20);
4552
4553 while (!kthread_should_stop()) {
e3d6f909
AG		 4554 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4555 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 4556 kthread_should_stop());
4557 if (ret < 0)
4558 goto out;
4559
c66ac9db
NB		 4560get_cmd:
4561 __transport_execute_tasks(dev);
4562
5951146d
AG		 4563 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4564 if (!cmd)
c66ac9db
NB		 4565 continue;
4566
5951146d 4567 switch (cmd->t_state) {
680b73c5
CH		 4568 case TRANSPORT_NEW_CMD:
4569 BUG();
4570 break;
c66ac9db 4571 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 4572 if (!cmd->se_tfo->new_cmd_map) {
4573 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 4574 " NULL for TRANSPORT_NEW_CMD_MAP\n");
4575 BUG();
4576 }
e3d6f909 4577 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db
NB		 4578 if (ret < 0) {
4579 cmd->transport_error_status = ret;
4499dda8 4580 transport_generic_request_failure(cmd,
c66ac9db
NB		 4581 0, (cmd->data_direction !=
4582 DMA_TO_DEVICE));
4583 break;
4584 }
c66ac9db 4585 ret = transport_generic_new_cmd(cmd);
07bde79a
NB		 4586 if (ret == -EAGAIN)
4587 break;
4588 else if (ret < 0) {
c66ac9db 4589 cmd->transport_error_status = ret;
4499dda8 4590 transport_generic_request_failure(cmd,
c66ac9db
NB		 4591 0, (cmd->data_direction !=
4592 DMA_TO_DEVICE));
4593 }
4594 break;
4595 case TRANSPORT_PROCESS_WRITE:
4596 transport_generic_process_write(cmd);
4597 break;
f4366772 4598 case TRANSPORT_FREE_CMD_INTR:
82f1c8a4 4599 transport_generic_free_cmd(cmd, 0);
f4366772 4600 break;
c66ac9db
NB		 4601 case TRANSPORT_PROCESS_TMR:
4602 transport_generic_do_tmr(cmd);
4603 break;
07bde79a 4604 case TRANSPORT_COMPLETE_QF_WP:
e057f533
CH		 4605 transport_write_pending_qf(cmd);
4606 break;
4607 case TRANSPORT_COMPLETE_QF_OK:
4608 transport_complete_qf(cmd);
07bde79a 4609 break;
c66ac9db 4610 default:
f2da9dbd
CH		 4611 pr_err("Unknown t_state: %d for ITT: 0x%08x "
4612 "i_state: %d on SE LUN: %u\n",
4613 cmd->t_state,
e3d6f909
AG		 4614 cmd->se_tfo->get_task_tag(cmd),
4615 cmd->se_tfo->get_cmd_state(cmd),
4616 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 4617 BUG();
4618 }
4619
4620 goto get_cmd;
4621 }
4622
4623out:
ce8762f6
NB		 4624 WARN_ON(!list_empty(&dev->state_task_list));
4625 WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
c66ac9db
NB		 4626 dev->process_thread = NULL;
4627 return 0;
4628}
Linux 6.x block layer and io_uring tree(s)