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target: Allow sbc_ops->execute_rw() to accept SGLs + data_direction
[deliverable/linux.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
fd9a11d7 6 * (c) Copyright 2002-2012 RisingTide Systems LLC.
c66ac9db
NB		 7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
c66ac9db
NB		 26#include <linux/net.h>
27#include <linux/delay.h>
28#include <linux/string.h>
29#include <linux/timer.h>
30#include <linux/slab.h>
31#include <linux/blkdev.h>
32#include <linux/spinlock.h>
c66ac9db
NB		 33#include <linux/kthread.h>
34#include <linux/in.h>
35#include <linux/cdrom.h>
827509e3 36#include <linux/module.h>
015487b8 37#include <linux/ratelimit.h>
c66ac9db
NB		 38#include <asm/unaligned.h>
39#include <net/sock.h>
40#include <net/tcp.h>
41#include <scsi/scsi.h>
42#include <scsi/scsi_cmnd.h>
e66ecd50 43#include <scsi/scsi_tcq.h>
c66ac9db
NB		 44
45#include <target/target_core_base.h>
c4795fb2
CH		 46#include <target/target_core_backend.h>
47#include <target/target_core_fabric.h>
c66ac9db
NB		 48#include <target/target_core_configfs.h>
49
e26d99ae 50#include "target_core_internal.h"
c66ac9db 51#include "target_core_alua.h"
c66ac9db 52#include "target_core_pr.h"
c66ac9db
NB		 53#include "target_core_ua.h"
54
e5c0d6ad
RD		 55#define CREATE_TRACE_POINTS
56#include <trace/events/target.h>
57
35e0e757 58static struct workqueue_struct *target_completion_wq;
c66ac9db 59static struct kmem_cache *se_sess_cache;
c66ac9db 60struct kmem_cache *se_ua_cache;
c66ac9db
NB		 61struct kmem_cache *t10_pr_reg_cache;
62struct kmem_cache *t10_alua_lu_gp_cache;
63struct kmem_cache *t10_alua_lu_gp_mem_cache;
64struct kmem_cache *t10_alua_tg_pt_gp_cache;
65struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
66
c66ac9db 67static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 68static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 69 struct se_device *dev);
05d1c7c0 70static int transport_generic_get_mem(struct se_cmd *cmd);
d5ddad41 71static int transport_put_cmd(struct se_cmd *cmd);
35e0e757 72static void target_complete_ok_work(struct work_struct *work);
c66ac9db 73
e3d6f909 74int init_se_kmem_caches(void)
c66ac9db 75{
c66ac9db
NB		 76 se_sess_cache = kmem_cache_create("se_sess_cache",
77 sizeof(struct se_session), __alignof__(struct se_session),
78 0, NULL);
6708bb27
AG		 79 if (!se_sess_cache) {
80 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 81 " failed\n");
c8e31f26 82 goto out;
c66ac9db
NB		 83 }
84 se_ua_cache = kmem_cache_create("se_ua_cache",
85 sizeof(struct se_ua), __alignof__(struct se_ua),
86 0, NULL);
6708bb27
AG		 87 if (!se_ua_cache) {
88 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 89 goto out_free_sess_cache;
c66ac9db 90 }
c66ac9db
NB		 91 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
92 sizeof(struct t10_pr_registration),
93 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 94 if (!t10_pr_reg_cache) {
95 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 96 " failed\n");
35e0e757 97 goto out_free_ua_cache;
c66ac9db
NB		 98 }
99 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
100 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
101 0, NULL);
6708bb27
AG		 102 if (!t10_alua_lu_gp_cache) {
103 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 104 " failed\n");
35e0e757 105 goto out_free_pr_reg_cache;
c66ac9db
NB		 106 }
107 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
108 sizeof(struct t10_alua_lu_gp_member),
109 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 110 if (!t10_alua_lu_gp_mem_cache) {
111 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 112 "cache failed\n");
35e0e757 113 goto out_free_lu_gp_cache;
c66ac9db
NB		 114 }
115 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
116 sizeof(struct t10_alua_tg_pt_gp),
117 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 118 if (!t10_alua_tg_pt_gp_cache) {
119 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 120 "cache failed\n");
35e0e757 121 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 122 }
123 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
124 "t10_alua_tg_pt_gp_mem_cache",
125 sizeof(struct t10_alua_tg_pt_gp_member),
126 __alignof__(struct t10_alua_tg_pt_gp_member),
127 0, NULL);
6708bb27
AG		 128 if (!t10_alua_tg_pt_gp_mem_cache) {
129 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 130 "mem_t failed\n");
35e0e757 131 goto out_free_tg_pt_gp_cache;
c66ac9db
NB		 132 }
133
35e0e757
CH		 134 target_completion_wq = alloc_workqueue("target_completion",
135 WQ_MEM_RECLAIM, 0);
136 if (!target_completion_wq)
137 goto out_free_tg_pt_gp_mem_cache;
138
c66ac9db 139 return 0;
35e0e757
CH		 140
141out_free_tg_pt_gp_mem_cache:
142 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
143out_free_tg_pt_gp_cache:
144 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
145out_free_lu_gp_mem_cache:
146 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
147out_free_lu_gp_cache:
148 kmem_cache_destroy(t10_alua_lu_gp_cache);
149out_free_pr_reg_cache:
150 kmem_cache_destroy(t10_pr_reg_cache);
151out_free_ua_cache:
152 kmem_cache_destroy(se_ua_cache);
153out_free_sess_cache:
154 kmem_cache_destroy(se_sess_cache);
c66ac9db 155out:
e3d6f909 156 return -ENOMEM;
c66ac9db
NB		 157}
158
e3d6f909 159void release_se_kmem_caches(void)
c66ac9db 160{
35e0e757 161 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 162 kmem_cache_destroy(se_sess_cache);
163 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 164 kmem_cache_destroy(t10_pr_reg_cache);
165 kmem_cache_destroy(t10_alua_lu_gp_cache);
166 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
167 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
168 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 169}
170
e3d6f909
AG		 171/* This code ensures unique mib indexes are handed out. */
172static DEFINE_SPINLOCK(scsi_mib_index_lock);
173static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 174
175/*
176 * Allocate a new row index for the entry type specified
177 */
178u32 scsi_get_new_index(scsi_index_t type)
179{
180 u32 new_index;
181
e3d6f909 182 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 183
e3d6f909
AG		 184 spin_lock(&scsi_mib_index_lock);
185 new_index = ++scsi_mib_index[type];
186 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 187
188 return new_index;
189}
190
dbc5623e 191void transport_subsystem_check_init(void)
c66ac9db
NB		 192{
193 int ret;
283669d2 194 static int sub_api_initialized;
c66ac9db 195
dbc5623e
NB		 196 if (sub_api_initialized)
197 return;
198
c66ac9db
NB		 199 ret = request_module("target_core_iblock");
200 if (ret != 0)
6708bb27 201 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 202
203 ret = request_module("target_core_file");
204 if (ret != 0)
6708bb27 205 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 206
207 ret = request_module("target_core_pscsi");
208 if (ret != 0)
6708bb27 209 pr_err("Unable to load target_core_pscsi\n");
c66ac9db 210
e3d6f909 211 sub_api_initialized = 1;
c66ac9db
NB		 212}
213
214struct se_session *transport_init_session(void)
215{
216 struct se_session *se_sess;
217
218 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 219 if (!se_sess) {
220 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 221 " se_sess_cache\n");
222 return ERR_PTR(-ENOMEM);
223 }
224 INIT_LIST_HEAD(&se_sess->sess_list);
225 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d 226 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
9b31a328 227 INIT_LIST_HEAD(&se_sess->sess_wait_list);
a17f091d 228 spin_lock_init(&se_sess->sess_cmd_lock);
41ac82b6 229 kref_init(&se_sess->sess_kref);
c66ac9db
NB		 230
231 return se_sess;
232}
233EXPORT_SYMBOL(transport_init_session);
234
c0add7fd
NB		 235int transport_alloc_session_tags(struct se_session *se_sess,
236 unsigned int tag_num, unsigned int tag_size)
237{
238 int rc;
239
240 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size, GFP_KERNEL);
241 if (!se_sess->sess_cmd_map) {
242 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
243 return -ENOMEM;
244 }
245
246 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
247 if (rc < 0) {
248 pr_err("Unable to init se_sess->sess_tag_pool,"
249 " tag_num: %u\n", tag_num);
250 kfree(se_sess->sess_cmd_map);
251 se_sess->sess_cmd_map = NULL;
252 return -ENOMEM;
253 }
254
255 return 0;
256}
257EXPORT_SYMBOL(transport_alloc_session_tags);
258
259struct se_session *transport_init_session_tags(unsigned int tag_num,
260 unsigned int tag_size)
261{
262 struct se_session *se_sess;
263 int rc;
264
265 se_sess = transport_init_session();
266 if (IS_ERR(se_sess))
267 return se_sess;
268
269 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
270 if (rc < 0) {
271 transport_free_session(se_sess);
272 return ERR_PTR(-ENOMEM);
273 }
274
275 return se_sess;
276}
277EXPORT_SYMBOL(transport_init_session_tags);
278
c66ac9db 279/*
140854cb 280 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 281 */
282void __transport_register_session(
283 struct se_portal_group *se_tpg,
284 struct se_node_acl *se_nacl,
285 struct se_session *se_sess,
286 void *fabric_sess_ptr)
287{
288 unsigned char buf[PR_REG_ISID_LEN];
289
290 se_sess->se_tpg = se_tpg;
291 se_sess->fabric_sess_ptr = fabric_sess_ptr;
292 /*
293 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
294 *
295 * Only set for struct se_session's that will actually be moving I/O.
296 * eg: *NOT* discovery sessions.
297 */
298 if (se_nacl) {
299 /*
300 * If the fabric module supports an ISID based TransportID,
301 * save this value in binary from the fabric I_T Nexus now.
302 */
e3d6f909 303 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 304 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 305 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 306 &buf[0], PR_REG_ISID_LEN);
307 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
308 }
afb999ff
NB		 309 kref_get(&se_nacl->acl_kref);
310
c66ac9db
NB		 311 spin_lock_irq(&se_nacl->nacl_sess_lock);
312 /*
313 * The se_nacl->nacl_sess pointer will be set to the
314 * last active I_T Nexus for each struct se_node_acl.
315 */
316 se_nacl->nacl_sess = se_sess;
317
318 list_add_tail(&se_sess->sess_acl_list,
319 &se_nacl->acl_sess_list);
320 spin_unlock_irq(&se_nacl->nacl_sess_lock);
321 }
322 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
323
6708bb27 324 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 325 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 326}
327EXPORT_SYMBOL(__transport_register_session);
328
329void transport_register_session(
330 struct se_portal_group *se_tpg,
331 struct se_node_acl *se_nacl,
332 struct se_session *se_sess,
333 void *fabric_sess_ptr)
334{
140854cb
NB		 335 unsigned long flags;
336
337 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 338 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 339 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 340}
341EXPORT_SYMBOL(transport_register_session);
342
ecf0dd66 343static void target_release_session(struct kref *kref)
41ac82b6
NB		 344{
345 struct se_session *se_sess = container_of(kref,
346 struct se_session, sess_kref);
347 struct se_portal_group *se_tpg = se_sess->se_tpg;
348
349 se_tpg->se_tpg_tfo->close_session(se_sess);
350}
351
352void target_get_session(struct se_session *se_sess)
353{
354 kref_get(&se_sess->sess_kref);
355}
356EXPORT_SYMBOL(target_get_session);
357
33933a0e 358void target_put_session(struct se_session *se_sess)
41ac82b6 359{
4149268e
JE		 360 struct se_portal_group *tpg = se_sess->se_tpg;
361
362 if (tpg->se_tpg_tfo->put_session != NULL) {
363 tpg->se_tpg_tfo->put_session(se_sess);
364 return;
365 }
33933a0e 366 kref_put(&se_sess->sess_kref, target_release_session);
41ac82b6
NB		 367}
368EXPORT_SYMBOL(target_put_session);
369
afb999ff
NB		 370static void target_complete_nacl(struct kref *kref)
371{
372 struct se_node_acl *nacl = container_of(kref,
373 struct se_node_acl, acl_kref);
374
375 complete(&nacl->acl_free_comp);
376}
377
378void target_put_nacl(struct se_node_acl *nacl)
379{
380 kref_put(&nacl->acl_kref, target_complete_nacl);
381}
382
c66ac9db
NB		 383void transport_deregister_session_configfs(struct se_session *se_sess)
384{
385 struct se_node_acl *se_nacl;
23388864 386 unsigned long flags;
c66ac9db
NB		 387 /*
388 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
389 */
390 se_nacl = se_sess->se_node_acl;
6708bb27 391 if (se_nacl) {
23388864 392 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 393 if (se_nacl->acl_stop == 0)
394 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 395 /*
396 * If the session list is empty, then clear the pointer.
397 * Otherwise, set the struct se_session pointer from the tail
398 * element of the per struct se_node_acl active session list.
399 */
400 if (list_empty(&se_nacl->acl_sess_list))
401 se_nacl->nacl_sess = NULL;
402 else {
403 se_nacl->nacl_sess = container_of(
404 se_nacl->acl_sess_list.prev,
405 struct se_session, sess_acl_list);
406 }
23388864 407 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 408 }
409}
410EXPORT_SYMBOL(transport_deregister_session_configfs);
411
412void transport_free_session(struct se_session *se_sess)
413{
c0add7fd
NB		 414 if (se_sess->sess_cmd_map) {
415 percpu_ida_destroy(&se_sess->sess_tag_pool);
416 kfree(se_sess->sess_cmd_map);
417 }
c66ac9db
NB		 418 kmem_cache_free(se_sess_cache, se_sess);
419}
420EXPORT_SYMBOL(transport_free_session);
421
422void transport_deregister_session(struct se_session *se_sess)
423{
424 struct se_portal_group *se_tpg = se_sess->se_tpg;
01468346 425 struct target_core_fabric_ops *se_tfo;
c66ac9db 426 struct se_node_acl *se_nacl;
e63a8e19 427 unsigned long flags;
01468346 428 bool comp_nacl = true;
c66ac9db 429
6708bb27 430 if (!se_tpg) {
c66ac9db
NB		 431 transport_free_session(se_sess);
432 return;
433 }
01468346 434 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 435
e63a8e19 436 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 437 list_del(&se_sess->sess_list);
438 se_sess->se_tpg = NULL;
439 se_sess->fabric_sess_ptr = NULL;
e63a8e19 440 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 441
442 /*
443 * Determine if we need to do extra work for this initiator node's
444 * struct se_node_acl if it had been previously dynamically generated.
445 */
446 se_nacl = se_sess->se_node_acl;
01468346
NB		 447
448 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
449 if (se_nacl && se_nacl->dynamic_node_acl) {
450 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
451 list_del(&se_nacl->acl_list);
452 se_tpg->num_node_acls--;
453 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
454 core_tpg_wait_for_nacl_pr_ref(se_nacl);
455 core_free_device_list_for_node(se_nacl, se_tpg);
456 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
457
458 comp_nacl = false;
459 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 460 }
c66ac9db 461 }
01468346 462 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db 463
6708bb27 464 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 465 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 466 /*
afb999ff
NB		 467 * If last kref is dropping now for an explict NodeACL, awake sleeping
468 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
469 * removal context.
01468346
NB		 470 */
471 if (se_nacl && comp_nacl == true)
afb999ff 472 target_put_nacl(se_nacl);
01468346 473
afb999ff 474 transport_free_session(se_sess);
c66ac9db
NB		 475}
476EXPORT_SYMBOL(transport_deregister_session);
477
478/*
a1d8b49a 479 * Called with cmd->t_state_lock held.
c66ac9db 480 */
cf572a96 481static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 482{
42bf829e 483 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 484 unsigned long flags;
485
42bf829e
CH		 486 if (!dev)
487 return;
c66ac9db 488
cf572a96
CH		 489 if (cmd->transport_state & CMD_T_BUSY)
490 return;
c66ac9db 491
cf572a96
CH		 492 spin_lock_irqsave(&dev->execute_task_lock, flags);
493 if (cmd->state_active) {
494 list_del(&cmd->state_list);
cf572a96 495 cmd->state_active = false;
c66ac9db 496 }
cf572a96 497 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 498}
499
862e6389
NB		 500static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
501 bool write_pending)
c66ac9db
NB		 502{
503 unsigned long flags;
504
a1d8b49a 505 spin_lock_irqsave(&cmd->t_state_lock, flags);
862e6389
NB		 506 if (write_pending)
507 cmd->t_state = TRANSPORT_WRITE_PENDING;
508
c66ac9db
NB		 509 /*
510 * Determine if IOCTL context caller in requesting the stopping of this
511 * command for LUN shutdown purposes.
512 */
7d680f3b
CH		 513 if (cmd->transport_state & CMD_T_LUN_STOP) {
514 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
515 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 516
7d680f3b 517 cmd->transport_state &= ~CMD_T_ACTIVE;
f7113a47 518 if (remove_from_lists)
cf572a96 519 target_remove_from_state_list(cmd);
a1d8b49a 520 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 521
a1d8b49a 522 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 523 return 1;
524 }
f7113a47
CH		 525
526 if (remove_from_lists) {
527 target_remove_from_state_list(cmd);
528
529 /*
530 * Clear struct se_cmd->se_lun before the handoff to FE.
531 */
532 cmd->se_lun = NULL;
533 }
534
c66ac9db
NB		 535 /*
536 * Determine if frontend context caller is requesting the stopping of
e3d6f909 537 * this command for frontend exceptions.
c66ac9db 538 */
7d680f3b
CH		 539 if (cmd->transport_state & CMD_T_STOP) {
540 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
541 __func__, __LINE__,
e3d6f909 542 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 543
a1d8b49a 544 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 545
a1d8b49a 546 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 547 return 1;
548 }
f7113a47
CH		 549
550 cmd->transport_state &= ~CMD_T_ACTIVE;
551 if (remove_from_lists) {
552 /*
553 * Some fabric modules like tcm_loop can release
554 * their internally allocated I/O reference now and
555 * struct se_cmd now.
556 *
557 * Fabric modules are expected to return '1' here if the
558 * se_cmd being passed is released at this point,
559 * or zero if not being released.
560 */
561 if (cmd->se_tfo->check_stop_free != NULL) {
562 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
563 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 564 }
f7113a47 565 }
c66ac9db 566
a1d8b49a 567 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 568 return 0;
569}
570
571static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
572{
862e6389 573 return transport_cmd_check_stop(cmd, true, false);
c66ac9db
NB		 574}
575
576static void transport_lun_remove_cmd(struct se_cmd *cmd)
577{
e3d6f909 578 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 579 unsigned long flags;
580
581 if (!lun)
582 return;
583
c66ac9db 584 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
3d26fea0
CH		 585 if (!list_empty(&cmd->se_lun_node))
586 list_del_init(&cmd->se_lun_node);
c66ac9db
NB		 587 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
588}
589
590void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
591{
c66ac9db
NB		 592 if (transport_cmd_check_stop_to_fabric(cmd))
593 return;
af877292 594 if (remove)
e6a2573f 595 transport_put_cmd(cmd);
c66ac9db
NB		 596}
597
35e0e757
CH		 598static void target_complete_failure_work(struct work_struct *work)
599{
600 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
601
de103c93
CH		 602 transport_generic_request_failure(cmd,
603 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 604}
605
6138ed2a 606/*
d5829eac
PB		 607 * Used when asking transport to copy Sense Data from the underlying
608 * Linux/SCSI struct scsi_cmnd
6138ed2a 609 */
d5829eac 610static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 611{
6138ed2a 612 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 613
614 WARN_ON(!cmd->se_lun);
615
616 if (!dev)
d5829eac 617 return NULL;
6138ed2a 618
d5829eac
PB		 619 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
620 return NULL;
6138ed2a 621
9c58b7dd 622 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 623
d5829eac 624 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 625 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 626 return cmd->sense_buffer;
6138ed2a
PB		 627}
628
5787cacd 629void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 630{
42bf829e 631 struct se_device *dev = cmd->se_dev;
5787cacd 632 int success = scsi_status == GOOD;
c66ac9db 633 unsigned long flags;
c66ac9db 634
5787cacd
CH		 635 cmd->scsi_status = scsi_status;
636
637
a1d8b49a 638 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 639 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 640
c66ac9db 641 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 642 dev->transport->transport_complete(cmd,
643 cmd->t_data_sg,
644 transport_get_sense_buffer(cmd));
645 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 646 success = 1;
c66ac9db
NB		 647 }
648
649 /*
5787cacd 650 * See if we are waiting to complete for an exception condition.
c66ac9db 651 */
cf572a96 652 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 653 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 654 complete(&cmd->task_stop_comp);
c66ac9db
NB		 655 return;
656 }
2235007c
CH		 657
658 if (!success)
7d680f3b 659 cmd->transport_state |= CMD_T_FAILED;
2235007c 660
3d28934a
NB		 661 /*
662 * Check for case where an explict ABORT_TASK has been received
663 * and transport_wait_for_tasks() will be waiting for completion..
664 */
665 if (cmd->transport_state & CMD_T_ABORTED &&
666 cmd->transport_state & CMD_T_STOP) {
667 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
668 complete(&cmd->t_transport_stop_comp);
669 return;
670 } else if (cmd->transport_state & CMD_T_FAILED) {
35e0e757 671 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 672 } else {
35e0e757 673 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 674 }
35e0e757 675
35e0e757 676 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 677 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 678 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 679
35e0e757 680 queue_work(target_completion_wq, &cmd->work);
c66ac9db 681}
6bb35e00
CH		 682EXPORT_SYMBOL(target_complete_cmd);
683
cf572a96 684static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 685{
cf572a96
CH		 686 struct se_device *dev = cmd->se_dev;
687 unsigned long flags;
c66ac9db 688
cf572a96
CH		 689 spin_lock_irqsave(&dev->execute_task_lock, flags);
690 if (!cmd->state_active) {
691 list_add_tail(&cmd->state_list, &dev->state_list);
692 cmd->state_active = true;
c66ac9db 693 }
cf572a96 694 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 695}
696
07bde79a 697/*
f147abb4 698 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 699 */
7a6f0a1e
CH		 700static void transport_write_pending_qf(struct se_cmd *cmd);
701static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 702
0fd97ccf 703void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 704{
705 struct se_device *dev = container_of(work, struct se_device,
706 qf_work_queue);
bcac364a 707 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 708 struct se_cmd *cmd, *cmd_tmp;
709
710 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 711 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
712 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 713
bcac364a 714 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 715 list_del(&cmd->se_qf_node);
716 atomic_dec(&dev->dev_qf_count);
717 smp_mb__after_atomic_dec();
07bde79a 718
6708bb27 719 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 720 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 721 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 722 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
723 : "UNKNOWN");
f7a5cc0b 724
7a6f0a1e
CH		 725 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
726 transport_write_pending_qf(cmd);
727 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
728 transport_complete_qf(cmd);
07bde79a 729 }
07bde79a
NB		 730}
731
c66ac9db
NB		 732unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
733{
734 switch (cmd->data_direction) {
735 case DMA_NONE:
736 return "NONE";
737 case DMA_FROM_DEVICE:
738 return "READ";
739 case DMA_TO_DEVICE:
740 return "WRITE";
741 case DMA_BIDIRECTIONAL:
742 return "BIDI";
743 default:
744 break;
745 }
746
747 return "UNKNOWN";
748}
749
750void transport_dump_dev_state(
751 struct se_device *dev,
752 char *b,
753 int *bl)
754{
755 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 756 if (dev->export_count)
c66ac9db 757 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 758 else
c66ac9db 759 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 760
5f41a31d 761 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 762 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 763 dev->dev_attrib.block_size,
764 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 765 *bl += sprintf(b + *bl, " ");
766}
767
c66ac9db
NB		 768void transport_dump_vpd_proto_id(
769 struct t10_vpd *vpd,
770 unsigned char *p_buf,
771 int p_buf_len)
772{
773 unsigned char buf[VPD_TMP_BUF_SIZE];
774 int len;
775
776 memset(buf, 0, VPD_TMP_BUF_SIZE);
777 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
778
779 switch (vpd->protocol_identifier) {
780 case 0x00:
781 sprintf(buf+len, "Fibre Channel\n");
782 break;
783 case 0x10:
784 sprintf(buf+len, "Parallel SCSI\n");
785 break;
786 case 0x20:
787 sprintf(buf+len, "SSA\n");
788 break;
789 case 0x30:
790 sprintf(buf+len, "IEEE 1394\n");
791 break;
792 case 0x40:
793 sprintf(buf+len, "SCSI Remote Direct Memory Access"
794 " Protocol\n");
795 break;
796 case 0x50:
797 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
798 break;
799 case 0x60:
800 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
801 break;
802 case 0x70:
803 sprintf(buf+len, "Automation/Drive Interface Transport"
804 " Protocol\n");
805 break;
806 case 0x80:
807 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
808 break;
809 default:
810 sprintf(buf+len, "Unknown 0x%02x\n",
811 vpd->protocol_identifier);
812 break;
813 }
814
815 if (p_buf)
816 strncpy(p_buf, buf, p_buf_len);
817 else
6708bb27 818 pr_debug("%s", buf);
c66ac9db
NB		 819}
820
821void
822transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
823{
824 /*
825 * Check if the Protocol Identifier Valid (PIV) bit is set..
826 *
827 * from spc3r23.pdf section 7.5.1
828 */
829 if (page_83[1] & 0x80) {
830 vpd->protocol_identifier = (page_83[0] & 0xf0);
831 vpd->protocol_identifier_set = 1;
832 transport_dump_vpd_proto_id(vpd, NULL, 0);
833 }
834}
835EXPORT_SYMBOL(transport_set_vpd_proto_id);
836
837int transport_dump_vpd_assoc(
838 struct t10_vpd *vpd,
839 unsigned char *p_buf,
840 int p_buf_len)
841{
842 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 843 int ret = 0;
844 int len;
c66ac9db
NB		 845
846 memset(buf, 0, VPD_TMP_BUF_SIZE);
847 len = sprintf(buf, "T10 VPD Identifier Association: ");
848
849 switch (vpd->association) {
850 case 0x00:
851 sprintf(buf+len, "addressed logical unit\n");
852 break;
853 case 0x10:
854 sprintf(buf+len, "target port\n");
855 break;
856 case 0x20:
857 sprintf(buf+len, "SCSI target device\n");
858 break;
859 default:
860 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 861 ret = -EINVAL;
c66ac9db
NB		 862 break;
863 }
864
865 if (p_buf)
866 strncpy(p_buf, buf, p_buf_len);
867 else
6708bb27 868 pr_debug("%s", buf);
c66ac9db
NB		 869
870 return ret;
871}
872
873int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
874{
875 /*
876 * The VPD identification association..
877 *
878 * from spc3r23.pdf Section 7.6.3.1 Table 297
879 */
880 vpd->association = (page_83[1] & 0x30);
881 return transport_dump_vpd_assoc(vpd, NULL, 0);
882}
883EXPORT_SYMBOL(transport_set_vpd_assoc);
884
885int transport_dump_vpd_ident_type(
886 struct t10_vpd *vpd,
887 unsigned char *p_buf,
888 int p_buf_len)
889{
890 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 891 int ret = 0;
892 int len;
c66ac9db
NB		 893
894 memset(buf, 0, VPD_TMP_BUF_SIZE);
895 len = sprintf(buf, "T10 VPD Identifier Type: ");
896
897 switch (vpd->device_identifier_type) {
898 case 0x00:
899 sprintf(buf+len, "Vendor specific\n");
900 break;
901 case 0x01:
902 sprintf(buf+len, "T10 Vendor ID based\n");
903 break;
904 case 0x02:
905 sprintf(buf+len, "EUI-64 based\n");
906 break;
907 case 0x03:
908 sprintf(buf+len, "NAA\n");
909 break;
910 case 0x04:
911 sprintf(buf+len, "Relative target port identifier\n");
912 break;
913 case 0x08:
914 sprintf(buf+len, "SCSI name string\n");
915 break;
916 default:
917 sprintf(buf+len, "Unsupported: 0x%02x\n",
918 vpd->device_identifier_type);
e3d6f909 919 ret = -EINVAL;
c66ac9db
NB		 920 break;
921 }
922
e3d6f909
AG		 923 if (p_buf) {
924 if (p_buf_len < strlen(buf)+1)
925 return -EINVAL;
c66ac9db 926 strncpy(p_buf, buf, p_buf_len);
e3d6f909 927 } else {
6708bb27 928 pr_debug("%s", buf);
e3d6f909 929 }
c66ac9db
NB		 930
931 return ret;
932}
933
934int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
935{
936 /*
937 * The VPD identifier type..
938 *
939 * from spc3r23.pdf Section 7.6.3.1 Table 298
940 */
941 vpd->device_identifier_type = (page_83[1] & 0x0f);
942 return transport_dump_vpd_ident_type(vpd, NULL, 0);
943}
944EXPORT_SYMBOL(transport_set_vpd_ident_type);
945
946int transport_dump_vpd_ident(
947 struct t10_vpd *vpd,
948 unsigned char *p_buf,
949 int p_buf_len)
950{
951 unsigned char buf[VPD_TMP_BUF_SIZE];
952 int ret = 0;
953
954 memset(buf, 0, VPD_TMP_BUF_SIZE);
955
956 switch (vpd->device_identifier_code_set) {
957 case 0x01: /* Binary */
703d641d
DC		 958 snprintf(buf, sizeof(buf),
959 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 960 &vpd->device_identifier[0]);
961 break;
962 case 0x02: /* ASCII */
703d641d
DC		 963 snprintf(buf, sizeof(buf),
964 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 965 &vpd->device_identifier[0]);
966 break;
967 case 0x03: /* UTF-8 */
703d641d
DC		 968 snprintf(buf, sizeof(buf),
969 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 970 &vpd->device_identifier[0]);
971 break;
972 default:
973 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
974 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 975 ret = -EINVAL;
c66ac9db
NB		 976 break;
977 }
978
979 if (p_buf)
980 strncpy(p_buf, buf, p_buf_len);
981 else
6708bb27 982 pr_debug("%s", buf);
c66ac9db
NB		 983
984 return ret;
985}
986
987int
988transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
989{
990 static const char hex_str[] = "0123456789abcdef";
35d1efe8 991 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 992
993 /*
994 * The VPD Code Set (encoding)
995 *
996 * from spc3r23.pdf Section 7.6.3.1 Table 296
997 */
998 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
999 switch (vpd->device_identifier_code_set) {
1000 case 0x01: /* Binary */
1001 vpd->device_identifier[j++] =
1002 hex_str[vpd->device_identifier_type];
1003 while (i < (4 + page_83[3])) {
1004 vpd->device_identifier[j++] =
1005 hex_str[(page_83[i] & 0xf0) >> 4];
1006 vpd->device_identifier[j++] =
1007 hex_str[page_83[i] & 0x0f];
1008 i++;
1009 }
1010 break;
1011 case 0x02: /* ASCII */
1012 case 0x03: /* UTF-8 */
1013 while (i < (4 + page_83[3]))
1014 vpd->device_identifier[j++] = page_83[i++];
1015 break;
1016 default:
1017 break;
1018 }
1019
1020 return transport_dump_vpd_ident(vpd, NULL, 0);
1021}
1022EXPORT_SYMBOL(transport_set_vpd_ident);
1023
de103c93
CH		 1024sense_reason_t
1025target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1026{
1027 struct se_device *dev = cmd->se_dev;
1028
1029 if (cmd->unknown_data_length) {
1030 cmd->data_length = size;
1031 } else if (size != cmd->data_length) {
1032 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1033 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1034 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1035 cmd->data_length, size, cmd->t_task_cdb[0]);
1036
9b3b8041
CH		 1037 if (cmd->data_direction == DMA_TO_DEVICE) {
1038 pr_err("Rejecting underflow/overflow"
1039 " WRITE data\n");
de103c93 1040 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 1041 }
1042 /*
1043 * Reject READ_* or WRITE_* with overflow/underflow for
1044 * type SCF_SCSI_DATA_CDB.
1045 */
0fd97ccf 1046 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1047 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1048 " CDB on non 512-byte sector setup subsystem"
1049 " plugin: %s\n", dev->transport->name);
1050 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1051 return TCM_INVALID_CDB_FIELD;
9b3b8041 1052 }
4c054ba6
NB		 1053 /*
1054 * For the overflow case keep the existing fabric provided
1055 * ->data_length. Otherwise for the underflow case, reset
1056 * ->data_length to the smaller SCSI expected data transfer
1057 * length.
1058 */
9b3b8041
CH		 1059 if (size > cmd->data_length) {
1060 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1061 cmd->residual_count = (size - cmd->data_length);
1062 } else {
1063 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1064 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1065 cmd->data_length = size;
9b3b8041 1066 }
9b3b8041
CH		 1067 }
1068
1069 return 0;
1070
9b3b8041
CH		 1071}
1072
c66ac9db
NB		 1073/*
1074 * Used by fabric modules containing a local struct se_cmd within their
1075 * fabric dependent per I/O descriptor.
1076 */
1077void transport_init_se_cmd(
1078 struct se_cmd *cmd,
1079 struct target_core_fabric_ops *tfo,
1080 struct se_session *se_sess,
1081 u32 data_length,
1082 int data_direction,
1083 int task_attr,
1084 unsigned char *sense_buffer)
1085{
5951146d
AG		 1086 INIT_LIST_HEAD(&cmd->se_lun_node);
1087 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1088 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1089 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1090 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a
AG		 1091 init_completion(&cmd->transport_lun_fe_stop_comp);
1092 init_completion(&cmd->transport_lun_stop_comp);
1093 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1094 init_completion(&cmd->cmd_wait_comp);
cf572a96 1095 init_completion(&cmd->task_stop_comp);
a1d8b49a 1096 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1097 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1098
1099 cmd->se_tfo = tfo;
1100 cmd->se_sess = se_sess;
1101 cmd->data_length = data_length;
1102 cmd->data_direction = data_direction;
1103 cmd->sam_task_attr = task_attr;
1104 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1105
1106 cmd->state_active = false;
c66ac9db
NB		 1107}
1108EXPORT_SYMBOL(transport_init_se_cmd);
1109
de103c93
CH		 1110static sense_reason_t
1111transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1112{
019c4ca6
CH		 1113 struct se_device *dev = cmd->se_dev;
1114
c66ac9db
NB		 1115 /*
1116 * Check if SAM Task Attribute emulation is enabled for this
1117 * struct se_device storage object
1118 */
019c4ca6 1119 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 1120 return 0;
1121
e66ecd50 1122 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1123 pr_debug("SAM Task Attribute ACA"
c66ac9db 1124 " emulation is not supported\n");
de103c93 1125 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1126 }
1127 /*
1128 * Used to determine when ORDERED commands should go from
1129 * Dormant to Active status.
1130 */
019c4ca6 1131 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
c66ac9db 1132 smp_mb__after_atomic_inc();
6708bb27 1133 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1134 cmd->se_ordered_id, cmd->sam_task_attr,
019c4ca6 1135 dev->transport->name);
c66ac9db
NB		 1136 return 0;
1137}
1138
de103c93
CH		 1139sense_reason_t
1140target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1141{
0fd97ccf 1142 struct se_device *dev = cmd->se_dev;
de103c93 1143 sense_reason_t ret;
c66ac9db 1144
c66ac9db
NB		 1145 /*
1146 * Ensure that the received CDB is less than the max (252 + 8) bytes
1147 * for VARIABLE_LENGTH_CMD
1148 */
1149 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1150 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1151 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1152 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1153 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1154 }
1155 /*
1156 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1157 * allocate the additional extended CDB buffer now.. Otherwise
1158 * setup the pointer from __t_task_cdb to t_task_cdb.
1159 */
a1d8b49a
AG		 1160 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1161 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1162 GFP_KERNEL);
6708bb27
AG		 1163 if (!cmd->t_task_cdb) {
1164 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1165 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1166 scsi_command_size(cdb),
a1d8b49a 1167 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1168 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1169 }
1170 } else
a1d8b49a 1171 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1172 /*
a1d8b49a 1173 * Copy the original CDB into cmd->
c66ac9db 1174 */
a1d8b49a 1175 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1176
e5c0d6ad
RD		 1177 trace_target_sequencer_start(cmd);
1178
cb4f4d3c
CH		 1179 /*
1180 * Check for an existing UNIT ATTENTION condition
1181 */
de103c93
CH		 1182 ret = target_scsi3_ua_check(cmd);
1183 if (ret)
1184 return ret;
cb4f4d3c 1185
c87fbd56 1186 ret = target_alua_state_check(cmd);
de103c93
CH		 1187 if (ret)
1188 return ret;
cb4f4d3c 1189
d977f437 1190 ret = target_check_reservation(cmd);
f85eda8d
NB		 1191 if (ret) {
1192 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
d977f437 1193 return ret;
f85eda8d 1194 }
cb4f4d3c 1195
0fd97ccf 1196 ret = dev->transport->parse_cdb(cmd);
de103c93
CH		 1197 if (ret)
1198 return ret;
1199
1200 ret = transport_check_alloc_task_attr(cmd);
1201 if (ret)
c66ac9db 1202 return ret;
cb4f4d3c 1203
cb4f4d3c 1204 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
cb4f4d3c 1205
c66ac9db
NB		 1206 spin_lock(&cmd->se_lun->lun_sep_lock);
1207 if (cmd->se_lun->lun_sep)
1208 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1209 spin_unlock(&cmd->se_lun->lun_sep_lock);
1210 return 0;
1211}
a12f41f8 1212EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1213
695434e1
NB		 1214/*
1215 * Used by fabric module frontends to queue tasks directly.
1216 * Many only be used from process context only
1217 */
1218int transport_handle_cdb_direct(
1219 struct se_cmd *cmd)
1220{
de103c93 1221 sense_reason_t ret;
dd8ae59d 1222
695434e1
NB		 1223 if (!cmd->se_lun) {
1224 dump_stack();
6708bb27 1225 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1226 return -EINVAL;
1227 }
1228 if (in_interrupt()) {
1229 dump_stack();
6708bb27 1230 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1231 " from interrupt context\n");
1232 return -EINVAL;
1233 }
dd8ae59d 1234 /*
af877292
CH		 1235 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1236 * outstanding descriptors are handled correctly during shutdown via
1237 * transport_wait_for_tasks()
dd8ae59d
NB		 1238 *
1239 * Also, we don't take cmd->t_state_lock here as we only expect
1240 * this to be called for initial descriptor submission.
1241 */
1242 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1243 cmd->transport_state |= CMD_T_ACTIVE;
1244
dd8ae59d
NB		 1245 /*
1246 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1247 * so follow TRANSPORT_NEW_CMD processing thread context usage
1248 * and call transport_generic_request_failure() if necessary..
1249 */
1250 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1251 if (ret)
1252 transport_generic_request_failure(cmd, ret);
dd8ae59d 1253 return 0;
695434e1
NB		 1254}
1255EXPORT_SYMBOL(transport_handle_cdb_direct);
1256
de103c93
CH		 1257static sense_reason_t
1258transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1259 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1260{
1261 if (!sgl || !sgl_count)
1262 return 0;
1263
1264 /*
1265 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1266 * scatterlists already have been set to follow what the fabric
1267 * passes for the original expected data transfer length.
1268 */
1269 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1270 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1271 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1272 return TCM_INVALID_CDB_FIELD;
1273 }
1274
1275 cmd->t_data_sg = sgl;
1276 cmd->t_data_nents = sgl_count;
1277
1278 if (sgl_bidi && sgl_bidi_count) {
1279 cmd->t_bidi_data_sg = sgl_bidi;
1280 cmd->t_bidi_data_nents = sgl_bidi_count;
1281 }
1282 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1283 return 0;
1284}
1285
a026757f
NB		 1286/*
1287 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1288 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1289 *
1290 * @se_cmd: command descriptor to submit
1291 * @se_sess: associated se_sess for endpoint
1292 * @cdb: pointer to SCSI CDB
1293 * @sense: pointer to SCSI sense buffer
1294 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1295 * @data_length: fabric expected data transfer length
1296 * @task_addr: SAM task attribute
1297 * @data_dir: DMA data direction
1298 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1299 * @sgl: struct scatterlist memory for unidirectional mapping
1300 * @sgl_count: scatterlist count for unidirectional mapping
1301 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1302 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
a6360785 1303 *
d6dfc868
RD		 1304 * Returns non zero to signal active I/O shutdown failure. All other
1305 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1306 * but still return zero here.
1307 *
a6360785
NB		 1308 * This may only be called from process context, and also currently
1309 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1310 */
1311int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785 1312 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
a026757f
NB		 1313 u32 data_length, int task_attr, int data_dir, int flags,
1314 struct scatterlist *sgl, u32 sgl_count,
1315 struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
a6360785
NB		 1316{
1317 struct se_portal_group *se_tpg;
de103c93
CH		 1318 sense_reason_t rc;
1319 int ret;
a6360785
NB		 1320
1321 se_tpg = se_sess->se_tpg;
1322 BUG_ON(!se_tpg);
1323 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1324 BUG_ON(in_interrupt());
1325 /*
1326 * Initialize se_cmd for target operation. From this point
1327 * exceptions are handled by sending exception status via
1328 * target_core_fabric_ops->queue_status() callback
1329 */
1330 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1331 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1332 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1333 se_cmd->unknown_data_length = 1;
a6360785
NB		 1334 /*
1335 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1336 * se_sess->sess_cmd_list. A second kref_get here is necessary
1337 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1338 * kref_put() to happen during fabric packet acknowledgement.
1339 */
de103c93
CH		 1340 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1341 if (ret)
1342 return ret;
a6360785
NB		 1343 /*
1344 * Signal bidirectional data payloads to target-core
1345 */
1346 if (flags & TARGET_SCF_BIDI_OP)
1347 se_cmd->se_cmd_flags |= SCF_BIDI;
1348 /*
1349 * Locate se_lun pointer and attach it to struct se_cmd
1350 */
de103c93
CH		 1351 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1352 if (rc) {
1353 transport_send_check_condition_and_sense(se_cmd, rc, 0);
735703ca 1354 target_put_sess_cmd(se_sess, se_cmd);
d6dfc868 1355 return 0;
735703ca 1356 }
d6e0175c 1357
a12f41f8 1358 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
735703ca 1359 if (rc != 0) {
de103c93 1360 transport_generic_request_failure(se_cmd, rc);
d6dfc868 1361 return 0;
735703ca 1362 }
a026757f
NB		 1363 /*
1364 * When a non zero sgl_count has been passed perform SGL passthrough
1365 * mapping for pre-allocated fabric memory instead of having target
1366 * core perform an internal SGL allocation..
1367 */
1368 if (sgl_count != 0) {
1369 BUG_ON(!sgl);
1370
944981c7
NB		 1371 /*
1372 * A work-around for tcm_loop as some userspace code via
1373 * scsi-generic do not memset their associated read buffers,
1374 * so go ahead and do that here for type non-data CDBs. Also
1375 * note that this is currently guaranteed to be a single SGL
1376 * for this case by target core in target_setup_cmd_from_cdb()
1377 * -> transport_generic_cmd_sequencer().
1378 */
1379 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1380 se_cmd->data_direction == DMA_FROM_DEVICE) {
1381 unsigned char *buf = NULL;
1382
1383 if (sgl)
1384 buf = kmap(sg_page(sgl)) + sgl->offset;
1385
1386 if (buf) {
1387 memset(buf, 0, sgl->length);
1388 kunmap(sg_page(sgl));
1389 }
1390 }
1391
a026757f
NB		 1392 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1393 sgl_bidi, sgl_bidi_count);
1394 if (rc != 0) {
de103c93 1395 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1396 return 0;
1397 }
1398 }
11e319ed
AG		 1399 /*
1400 * Check if we need to delay processing because of ALUA
1401 * Active/NonOptimized primary access state..
1402 */
1403 core_alua_check_nonop_delay(se_cmd);
1404
a6360785 1405 transport_handle_cdb_direct(se_cmd);
d6dfc868 1406 return 0;
a6360785 1407}
a026757f
NB		 1408EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1409
1410/*
1411 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1412 *
1413 * @se_cmd: command descriptor to submit
1414 * @se_sess: associated se_sess for endpoint
1415 * @cdb: pointer to SCSI CDB
1416 * @sense: pointer to SCSI sense buffer
1417 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1418 * @data_length: fabric expected data transfer length
1419 * @task_addr: SAM task attribute
1420 * @data_dir: DMA data direction
1421 * @flags: flags for command submission from target_sc_flags_tables
1422 *
1423 * Returns non zero to signal active I/O shutdown failure. All other
1424 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1425 * but still return zero here.
1426 *
1427 * This may only be called from process context, and also currently
1428 * assumes internal allocation of fabric payload buffer by target-core.
1429 *
1430 * It also assumes interal target core SGL memory allocation.
1431 */
1432int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1433 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1434 u32 data_length, int task_attr, int data_dir, int flags)
1435{
1436 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1437 unpacked_lun, data_length, task_attr, data_dir,
1438 flags, NULL, 0, NULL, 0);
1439}
a6360785
NB		 1440EXPORT_SYMBOL(target_submit_cmd);
1441
9f0d05c2
NB		 1442static void target_complete_tmr_failure(struct work_struct *work)
1443{
1444 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1445
1446 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1447 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1448
1449 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1450}
1451
ea98d7f9
AG		 1452/**
1453 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1454 * for TMR CDBs
1455 *
1456 * @se_cmd: command descriptor to submit
1457 * @se_sess: associated se_sess for endpoint
1458 * @sense: pointer to SCSI sense buffer
1459 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1460 * @fabric_context: fabric context for TMR req
1461 * @tm_type: Type of TM request
c0974f89
NB		 1462 * @gfp: gfp type for caller
1463 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1464 * @flags: submit cmd flags
ea98d7f9
AG		 1465 *
1466 * Callable from all contexts.
1467 **/
1468
c7042cae 1469int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1470 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1471 void *fabric_tmr_ptr, unsigned char tm_type,
1472 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1473{
1474 struct se_portal_group *se_tpg;
1475 int ret;
1476
1477 se_tpg = se_sess->se_tpg;
1478 BUG_ON(!se_tpg);
1479
1480 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1481 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1482 /*
1483 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1484 * allocation failure.
1485 */
c0974f89 1486 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1487 if (ret < 0)
1488 return -ENOMEM;
ea98d7f9 1489
c0974f89
NB		 1490 if (tm_type == TMR_ABORT_TASK)
1491 se_cmd->se_tmr_req->ref_task_tag = tag;
1492
ea98d7f9 1493 /* See target_submit_cmd for commentary */
bc187ea6
RD		 1494 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1495 if (ret) {
1496 core_tmr_release_req(se_cmd->se_tmr_req);
1497 return ret;
1498 }
ea98d7f9 1499
ea98d7f9
AG		 1500 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1501 if (ret) {
9f0d05c2
NB		 1502 /*
1503 * For callback during failure handling, push this work off
1504 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1505 */
1506 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1507 schedule_work(&se_cmd->work);
c7042cae 1508 return 0;
ea98d7f9
AG		 1509 }
1510 transport_generic_handle_tmr(se_cmd);
c7042cae 1511 return 0;
ea98d7f9
AG		 1512}
1513EXPORT_SYMBOL(target_submit_tmr);
1514
cdbb70bb 1515/*
cf572a96 1516 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1517 * has completed.
1518 */
cf572a96 1519bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cdbb70bb 1520{
cdbb70bb
CH		 1521 bool was_active = false;
1522
cf572a96
CH		 1523 if (cmd->transport_state & CMD_T_BUSY) {
1524 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1525 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1526
cf572a96
CH		 1527 pr_debug("cmd %p waiting to complete\n", cmd);
1528 wait_for_completion(&cmd->task_stop_comp);
1529 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1530
1531 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1532 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1533 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1534 was_active = true;
1535 }
1536
cdbb70bb
CH		 1537 return was_active;
1538}
1539
c66ac9db
NB		 1540/*
1541 * Handle SAM-esque emulation for generic transport request failures.
1542 */
de103c93
CH		 1543void transport_generic_request_failure(struct se_cmd *cmd,
1544 sense_reason_t sense_reason)
c66ac9db 1545{
07bde79a
NB		 1546 int ret = 0;
1547
6708bb27 1548 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1549 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1550 cmd->t_task_cdb[0]);
de103c93 1551 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1552 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1553 cmd->t_state, sense_reason);
d43d6aea 1554 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1555 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1556 (cmd->transport_state & CMD_T_STOP) != 0,
1557 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1558
c66ac9db
NB		 1559 /*
1560 * For SAM Task Attribute emulation for failed struct se_cmd
1561 */
019c4ca6 1562 transport_complete_task_attr(cmd);
c66ac9db 1563
de103c93 1564 switch (sense_reason) {
03e98c9e
NB		 1565 case TCM_NON_EXISTENT_LUN:
1566 case TCM_UNSUPPORTED_SCSI_OPCODE:
1567 case TCM_INVALID_CDB_FIELD:
1568 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1569 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1570 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1571 case TCM_UNKNOWN_MODE_PAGE:
1572 case TCM_WRITE_PROTECTED:
e2397c70 1573 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1574 case TCM_CHECK_CONDITION_ABORT_CMD:
1575 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1576 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1577 break;
de103c93
CH		 1578 case TCM_OUT_OF_RESOURCES:
1579 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1580 break;
03e98c9e 1581 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1582 /*
1583 * No SENSE Data payload for this case, set SCSI Status
1584 * and queue the response to $FABRIC_MOD.
1585 *
1586 * Uses linux/include/scsi/scsi.h SAM status codes defs
1587 */
1588 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1589 /*
1590 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1591 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1592 * CONFLICT STATUS.
1593 *
1594 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1595 */
e3d6f909 1596 if (cmd->se_sess &&
0fd97ccf 1597 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
e3d6f909 1598 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1599 cmd->orig_fe_lun, 0x2C,
1600 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1601
e5c0d6ad
RD		 1602 trace_target_cmd_complete(cmd);
1603 ret = cmd->se_tfo-> queue_status(cmd);
f147abb4 1604 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1605 goto queue_full;
c66ac9db 1606 goto check_stop;
c66ac9db 1607 default:
6708bb27 1608 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1609 cmd->t_task_cdb[0], sense_reason);
1610 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1611 break;
1612 }
f3146437 1613
de103c93 1614 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1615 if (ret == -EAGAIN || ret == -ENOMEM)
1616 goto queue_full;
07bde79a 1617
c66ac9db
NB		 1618check_stop:
1619 transport_lun_remove_cmd(cmd);
6708bb27 1620 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1621 ;
07bde79a
NB		 1622 return;
1623
1624queue_full:
e057f533
CH		 1625 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1626 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1627}
2fbff127 1628EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1629
5f41a31d 1630static void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1631{
de103c93 1632 sense_reason_t ret;
5f41a31d 1633
de103c93
CH		 1634 if (cmd->execute_cmd) {
1635 ret = cmd->execute_cmd(cmd);
1636 if (ret) {
1637 spin_lock_irq(&cmd->t_state_lock);
1638 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1639 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1640
de103c93
CH		 1641 transport_generic_request_failure(cmd, ret);
1642 }
5f41a31d
CH		 1643 }
1644}
1645
019c4ca6 1646static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1647{
1648 struct se_device *dev = cmd->se_dev;
1649
019c4ca6
CH		 1650 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1651 return false;
5f41a31d 1652
c66ac9db 1653 /*
25985edc 1654 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1655 * to allow the passed struct se_cmd list of tasks to the front of the list.
1656 */
5f41a31d
CH		 1657 switch (cmd->sam_task_attr) {
1658 case MSG_HEAD_TAG:
1659 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1660 "se_ordered_id: %u\n",
1661 cmd->t_task_cdb[0], cmd->se_ordered_id);
019c4ca6 1662 return false;
5f41a31d
CH		 1663 case MSG_ORDERED_TAG:
1664 atomic_inc(&dev->dev_ordered_sync);
c66ac9db
NB		 1665 smp_mb__after_atomic_inc();
1666
5f41a31d
CH		 1667 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1668 " se_ordered_id: %u\n",
1669 cmd->t_task_cdb[0], cmd->se_ordered_id);
1670
c66ac9db 1671 /*
5f41a31d
CH		 1672 * Execute an ORDERED command if no other older commands
1673 * exist that need to be completed first.
c66ac9db 1674 */
5f41a31d 1675 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1676 return false;
5f41a31d
CH		 1677 break;
1678 default:
c66ac9db
NB		 1679 /*
1680 * For SIMPLE and UNTAGGED Task Attribute commands
1681 */
5f41a31d 1682 atomic_inc(&dev->simple_cmds);
c66ac9db 1683 smp_mb__after_atomic_inc();
5f41a31d 1684 break;
c66ac9db 1685 }
5f41a31d 1686
019c4ca6
CH		 1687 if (atomic_read(&dev->dev_ordered_sync) == 0)
1688 return false;
c66ac9db 1689
019c4ca6
CH		 1690 spin_lock(&dev->delayed_cmd_lock);
1691 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1692 spin_unlock(&dev->delayed_cmd_lock);
1693
1694 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1695 " delayed CMD list, se_ordered_id: %u\n",
1696 cmd->t_task_cdb[0], cmd->sam_task_attr,
1697 cmd->se_ordered_id);
1698 return true;
1699}
1700
1701void target_execute_cmd(struct se_cmd *cmd)
1702{
1703 /*
1704 * If the received CDB has aleady been aborted stop processing it here.
1705 */
5bd665f2
LT		 1706 if (transport_check_aborted_status(cmd, 1)) {
1707 complete(&cmd->transport_lun_stop_comp);
5f41a31d 1708 return;
c66ac9db 1709 }
c66ac9db 1710
c66ac9db 1711 /*
019c4ca6
CH		 1712 * Determine if IOCTL context caller in requesting the stopping of this
1713 * command for LUN shutdown purposes.
c66ac9db 1714 */
019c4ca6
CH		 1715 spin_lock_irq(&cmd->t_state_lock);
1716 if (cmd->transport_state & CMD_T_LUN_STOP) {
1717 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1718 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1719
1720 cmd->transport_state &= ~CMD_T_ACTIVE;
1721 spin_unlock_irq(&cmd->t_state_lock);
1722 complete(&cmd->transport_lun_stop_comp);
1723 return;
1724 }
1725 /*
1726 * Determine if frontend context caller is requesting the stopping of
1727 * this command for frontend exceptions.
1728 */
1729 if (cmd->transport_state & CMD_T_STOP) {
1730 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1731 __func__, __LINE__,
1732 cmd->se_tfo->get_task_tag(cmd));
1733
1734 spin_unlock_irq(&cmd->t_state_lock);
1735 complete(&cmd->t_transport_stop_comp);
1736 return;
1737 }
1738
1739 cmd->t_state = TRANSPORT_PROCESSING;
1a398b97 1740 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
019c4ca6
CH		 1741 spin_unlock_irq(&cmd->t_state_lock);
1742
1a398b97
NB		 1743 if (target_handle_task_attr(cmd)) {
1744 spin_lock_irq(&cmd->t_state_lock);
1745 cmd->transport_state &= ~CMD_T_BUSY|CMD_T_SENT;
1746 spin_unlock_irq(&cmd->t_state_lock);
1747 return;
1748 }
1749
1750 __target_execute_cmd(cmd);
c66ac9db 1751}
70baf0ab 1752EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1753
5f41a31d
CH		 1754/*
1755 * Process all commands up to the last received ORDERED task attribute which
1756 * requires another blocking boundary
1757 */
1758static void target_restart_delayed_cmds(struct se_device *dev)
1759{
1760 for (;;) {
1761 struct se_cmd *cmd;
1762
1763 spin_lock(&dev->delayed_cmd_lock);
1764 if (list_empty(&dev->delayed_cmd_list)) {
1765 spin_unlock(&dev->delayed_cmd_lock);
1766 break;
1767 }
1768
1769 cmd = list_entry(dev->delayed_cmd_list.next,
1770 struct se_cmd, se_delayed_node);
1771 list_del(&cmd->se_delayed_node);
1772 spin_unlock(&dev->delayed_cmd_lock);
1773
1774 __target_execute_cmd(cmd);
1775
1776 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1777 break;
1778 }
1779}
1780
c66ac9db 1781/*
35e0e757 1782 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1783 * and ordered cmds need to have their tasks added to the execution queue.
1784 */
1785static void transport_complete_task_attr(struct se_cmd *cmd)
1786{
5951146d 1787 struct se_device *dev = cmd->se_dev;
c66ac9db 1788
019c4ca6
CH		 1789 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1790 return;
1791
e66ecd50 1792 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 1793 atomic_dec(&dev->simple_cmds);
1794 smp_mb__after_atomic_dec();
1795 dev->dev_cur_ordered_id++;
6708bb27 1796 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1797 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1798 cmd->se_ordered_id);
e66ecd50 1799 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 1800 dev->dev_cur_ordered_id++;
6708bb27 1801 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1802 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1803 cmd->se_ordered_id);
e66ecd50 1804 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 1805 atomic_dec(&dev->dev_ordered_sync);
1806 smp_mb__after_atomic_dec();
c66ac9db
NB		 1807
1808 dev->dev_cur_ordered_id++;
6708bb27 1809 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1810 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1811 }
c66ac9db 1812
5f41a31d 1813 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1814}
1815
e057f533 1816static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1817{
1818 int ret = 0;
1819
019c4ca6 1820 transport_complete_task_attr(cmd);
e057f533
CH		 1821
1822 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
e5c0d6ad 1823 trace_target_cmd_complete(cmd);
e057f533
CH		 1824 ret = cmd->se_tfo->queue_status(cmd);
1825 if (ret)
1826 goto out;
1827 }
07bde79a
NB		 1828
1829 switch (cmd->data_direction) {
1830 case DMA_FROM_DEVICE:
e5c0d6ad 1831 trace_target_cmd_complete(cmd);
07bde79a
NB		 1832 ret = cmd->se_tfo->queue_data_in(cmd);
1833 break;
1834 case DMA_TO_DEVICE:
ec98f782 1835 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 1836 ret = cmd->se_tfo->queue_data_in(cmd);
1837 if (ret < 0)
e057f533 1838 break;
07bde79a
NB		 1839 }
1840 /* Fall through for DMA_TO_DEVICE */
1841 case DMA_NONE:
e5c0d6ad 1842 trace_target_cmd_complete(cmd);
07bde79a
NB		 1843 ret = cmd->se_tfo->queue_status(cmd);
1844 break;
1845 default:
1846 break;
1847 }
1848
e057f533
CH		 1849out:
1850 if (ret < 0) {
1851 transport_handle_queue_full(cmd, cmd->se_dev);
1852 return;
1853 }
1854 transport_lun_remove_cmd(cmd);
1855 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1856}
1857
1858static void transport_handle_queue_full(
1859 struct se_cmd *cmd,
e057f533 1860 struct se_device *dev)
07bde79a
NB		 1861{
1862 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 1863 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1864 atomic_inc(&dev->dev_qf_count);
1865 smp_mb__after_atomic_inc();
1866 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1867
1868 schedule_work(&cmd->se_dev->qf_work_queue);
1869}
1870
35e0e757 1871static void target_complete_ok_work(struct work_struct *work)
c66ac9db 1872{
35e0e757 1873 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 1874 int ret;
35e0e757 1875
c66ac9db
NB		 1876 /*
1877 * Check if we need to move delayed/dormant tasks from cmds on the
1878 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1879 * Attribute.
1880 */
019c4ca6
CH		 1881 transport_complete_task_attr(cmd);
1882
07bde79a
NB		 1883 /*
1884 * Check to schedule QUEUE_FULL work, or execute an existing
1885 * cmd->transport_qf_callback()
1886 */
1887 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1888 schedule_work(&cmd->se_dev->qf_work_queue);
1889
c66ac9db 1890 /*
d5829eac 1891 * Check if we need to send a sense buffer from
c66ac9db
NB		 1892 * the struct se_cmd in question.
1893 */
1894 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 1895 WARN_ON(!cmd->scsi_status);
27a27099
PB		 1896 ret = transport_send_check_condition_and_sense(
1897 cmd, 0, 1);
1898 if (ret == -EAGAIN || ret == -ENOMEM)
1899 goto queue_full;
1900
1901 transport_lun_remove_cmd(cmd);
1902 transport_cmd_check_stop_to_fabric(cmd);
1903 return;
c66ac9db
NB		 1904 }
1905 /*
25985edc 1906 * Check for a callback, used by amongst other things
a6b0133c 1907 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 1908 */
a6b0133c
NB		 1909 if (cmd->transport_complete_callback) {
1910 sense_reason_t rc;
1911
1912 rc = cmd->transport_complete_callback(cmd);
1913 if (!rc)
1914 return;
1915
1916 ret = transport_send_check_condition_and_sense(cmd,
1917 rc, 0);
1918 if (ret == -EAGAIN || ret == -ENOMEM)
1919 goto queue_full;
1920
1921 transport_lun_remove_cmd(cmd);
1922 transport_cmd_check_stop_to_fabric(cmd);
1923 return;
1924 }
c66ac9db
NB		 1925
1926 switch (cmd->data_direction) {
1927 case DMA_FROM_DEVICE:
1928 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1929 if (cmd->se_lun->lun_sep) {
1930 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1931 cmd->data_length;
1932 }
1933 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 1934
e5c0d6ad 1935 trace_target_cmd_complete(cmd);
07bde79a 1936 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1937 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1938 goto queue_full;
c66ac9db
NB		 1939 break;
1940 case DMA_TO_DEVICE:
1941 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1942 if (cmd->se_lun->lun_sep) {
1943 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 1944 cmd->data_length;
1945 }
1946 spin_unlock(&cmd->se_lun->lun_sep_lock);
1947 /*
1948 * Check if we need to send READ payload for BIDI-COMMAND
1949 */
ec98f782 1950 if (cmd->t_bidi_data_sg) {
c66ac9db 1951 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1952 if (cmd->se_lun->lun_sep) {
1953 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1954 cmd->data_length;
1955 }
1956 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 1957 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1958 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1959 goto queue_full;
c66ac9db
NB		 1960 break;
1961 }
1962 /* Fall through for DMA_TO_DEVICE */
1963 case DMA_NONE:
e5c0d6ad 1964 trace_target_cmd_complete(cmd);
07bde79a 1965 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1966 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1967 goto queue_full;
c66ac9db
NB		 1968 break;
1969 default:
1970 break;
1971 }
1972
1973 transport_lun_remove_cmd(cmd);
1974 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1975 return;
1976
1977queue_full:
6708bb27 1978 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 1979 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 1980 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1981 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1982}
1983
6708bb27 1984static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 1985{
ec98f782 1986 struct scatterlist *sg;
ec98f782 1987 int count;
c66ac9db 1988
6708bb27
AG		 1989 for_each_sg(sgl, sg, nents, count)
1990 __free_page(sg_page(sg));
c66ac9db 1991
6708bb27
AG		 1992 kfree(sgl);
1993}
c66ac9db 1994
6708bb27
AG		 1995static inline void transport_free_pages(struct se_cmd *cmd)
1996{
1997 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
1998 return;
1999
2000 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2001 cmd->t_data_sg = NULL;
2002 cmd->t_data_nents = 0;
c66ac9db 2003
6708bb27 2004 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2005 cmd->t_bidi_data_sg = NULL;
2006 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2007}
2008
e26d99ae
CH		 2009/**
2010 * transport_release_cmd - free a command
2011 * @cmd: command to free
2012 *
2013 * This routine unconditionally frees a command, and reference counting
2014 * or list removal must be done in the caller.
2015 */
d5ddad41 2016static int transport_release_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2017{
2018 BUG_ON(!cmd->se_tfo);
2019
c8e31f26 2020 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 2021 core_tmr_release_req(cmd->se_tmr_req);
2022 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2023 kfree(cmd->t_task_cdb);
2024 /*
7481deb4
NB		 2025 * If this cmd has been setup with target_get_sess_cmd(), drop
2026 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2027 */
ca24976a 2028 return target_put_sess_cmd(cmd->se_sess, cmd);
e26d99ae
CH		 2029}
2030
d3df7825
CH		 2031/**
2032 * transport_put_cmd - release a reference to a command
2033 * @cmd: command to release
2034 *
2035 * This routine releases our reference to the command and frees it if possible.
2036 */
d5ddad41 2037static int transport_put_cmd(struct se_cmd *cmd)
c66ac9db 2038{
c66ac9db 2039 transport_free_pages(cmd);
d5ddad41 2040 return transport_release_cmd(cmd);
c66ac9db 2041}
c66ac9db 2042
4949314c 2043void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2044{
ec98f782 2045 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2046 struct page **pages;
2047 int i;
05d1c7c0
AG		 2048
2049 /*
ec98f782
AG		 2050 * We need to take into account a possible offset here for fabrics like
2051 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2052 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2053 */
4949314c
AG		 2054 if (!cmd->t_data_nents)
2055 return NULL;
3717ef0c
PB		 2056
2057 BUG_ON(!sg);
2058 if (cmd->t_data_nents == 1)
4949314c
AG		 2059 return kmap(sg_page(sg)) + sg->offset;
2060
2061 /* >1 page. use vmap */
2062 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2063 if (!pages)
4949314c
AG		 2064 return NULL;
2065
2066 /* convert sg[] to pages[] */
2067 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2068 pages[i] = sg_page(sg);
2069 }
2070
2071 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2072 kfree(pages);
de103c93 2073 if (!cmd->t_data_vmap)
4949314c
AG		 2074 return NULL;
2075
2076 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2077}
4949314c 2078EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2079
4949314c 2080void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2081{
a1edf9cf 2082 if (!cmd->t_data_nents) {
4949314c 2083 return;
a1edf9cf 2084 } else if (cmd->t_data_nents == 1) {
4949314c 2085 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2086 return;
2087 }
4949314c
AG		 2088
2089 vunmap(cmd->t_data_vmap);
2090 cmd->t_data_vmap = NULL;
05d1c7c0 2091}
4949314c 2092EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2093
c66ac9db 2094static int
05d1c7c0 2095transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 2096{
ec98f782
AG		 2097 u32 length = cmd->data_length;
2098 unsigned int nents;
2099 struct page *page;
9db9da33 2100 gfp_t zero_flag;
ec98f782 2101 int i = 0;
c66ac9db 2102
ec98f782
AG		 2103 nents = DIV_ROUND_UP(length, PAGE_SIZE);
2104 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2105 if (!cmd->t_data_sg)
2106 return -ENOMEM;
c66ac9db 2107
ec98f782
AG		 2108 cmd->t_data_nents = nents;
2109 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 2110
64f1db38 2111 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
9db9da33 2112
ec98f782
AG		 2113 while (length) {
2114 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2115 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2116 if (!page)
2117 goto out;
c66ac9db 2118
ec98f782
AG		 2119 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2120 length -= page_len;
2121 i++;
c66ac9db 2122 }
c66ac9db 2123 return 0;
c66ac9db 2124
ec98f782 2125out:
d0e27c88 2126 while (i > 0) {
ec98f782 2127 i--;
d0e27c88 2128 __free_page(sg_page(&cmd->t_data_sg[i]));
c66ac9db 2129 }
ec98f782
AG		 2130 kfree(cmd->t_data_sg);
2131 cmd->t_data_sg = NULL;
2132 return -ENOMEM;
c66ac9db
NB		 2133}
2134
da0f7619 2135/*
b16a35b0
AG		 2136 * Allocate any required resources to execute the command. For writes we
2137 * might not have the payload yet, so notify the fabric via a call to
2138 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2139 */
de103c93
CH		 2140sense_reason_t
2141transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2142{
c66ac9db
NB		 2143 int ret = 0;
2144
2145 /*
2146 * Determine is the TCM fabric module has already allocated physical
2147 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2148 * beforehand.
c66ac9db 2149 */
ec98f782
AG		 2150 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2151 cmd->data_length) {
05d1c7c0 2152 ret = transport_generic_get_mem(cmd);
c66ac9db 2153 if (ret < 0)
de103c93 2154 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2155 }
c66ac9db 2156 /*
c3196f0c
CH		 2157 * If this command is not a write we can execute it right here,
2158 * for write buffers we need to notify the fabric driver first
2159 * and let it call back once the write buffers are ready.
c66ac9db 2160 */
5f41a31d 2161 target_add_to_state_list(cmd);
c3196f0c
CH		 2162 if (cmd->data_direction != DMA_TO_DEVICE) {
2163 target_execute_cmd(cmd);
2164 return 0;
2165 }
862e6389 2166 transport_cmd_check_stop(cmd, false, true);
c3196f0c
CH		 2167
2168 ret = cmd->se_tfo->write_pending(cmd);
2169 if (ret == -EAGAIN || ret == -ENOMEM)
2170 goto queue_full;
2171
de103c93
CH		 2172 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2173 WARN_ON(ret);
2174
b69c1fcf 2175 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2176
c3196f0c
CH		 2177queue_full:
2178 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2179 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2180 transport_handle_queue_full(cmd, cmd->se_dev);
2181 return 0;
c66ac9db 2182}
a1d8b49a 2183EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2184
e057f533 2185static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2186{
f147abb4
NB		 2187 int ret;
2188
2189 ret = cmd->se_tfo->write_pending(cmd);
2190 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2191 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2192 cmd);
2193 transport_handle_queue_full(cmd, cmd->se_dev);
2194 }
07bde79a
NB		 2195}
2196
d5ddad41 2197int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2198{
d5ddad41
NB		 2199 int ret = 0;
2200
d14921d6 2201 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2202 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2203 transport_wait_for_tasks(cmd);
2204
d5ddad41 2205 ret = transport_release_cmd(cmd);
d14921d6
NB		 2206 } else {
2207 if (wait_for_tasks)
2208 transport_wait_for_tasks(cmd);
2209
82f1c8a4 2210 if (cmd->se_lun)
c66ac9db 2211 transport_lun_remove_cmd(cmd);
c66ac9db 2212
d5ddad41 2213 ret = transport_put_cmd(cmd);
c66ac9db 2214 }
d5ddad41 2215 return ret;
c66ac9db
NB		 2216}
2217EXPORT_SYMBOL(transport_generic_free_cmd);
2218
a17f091d
NB		 2219/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2220 * @se_sess: session to reference
2221 * @se_cmd: command descriptor to add
a6360785 2222 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2223 */
20361e69 2224int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
bc187ea6 2225 bool ack_kref)
a17f091d
NB		 2226{
2227 unsigned long flags;
bc187ea6 2228 int ret = 0;
a17f091d 2229
7481deb4 2230 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 2231 /*
2232 * Add a second kref if the fabric caller is expecting to handle
2233 * fabric acknowledgement that requires two target_put_sess_cmd()
2234 * invocations before se_cmd descriptor release.
2235 */
86715569 2236 if (ack_kref == true) {
a6360785 2237 kref_get(&se_cmd->cmd_kref);
86715569
NB		 2238 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2239 }
7481deb4 2240
a17f091d 2241 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2242 if (se_sess->sess_tearing_down) {
2243 ret = -ESHUTDOWN;
2244 goto out;
2245 }
a17f091d 2246 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2247out:
a17f091d 2248 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
bc187ea6 2249 return ret;
a17f091d 2250}
20361e69 2251EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2252
7481deb4 2253static void target_release_cmd_kref(struct kref *kref)
a17f091d 2254{
7481deb4
NB		 2255 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2256 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2257
a17f091d 2258 if (list_empty(&se_cmd->se_cmd_list)) {
ccf5ae83 2259 spin_unlock(&se_sess->sess_cmd_lock);
ffc32d52 2260 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2261 return;
a17f091d 2262 }
a17f091d 2263 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
ccf5ae83 2264 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2265 complete(&se_cmd->cmd_wait_comp);
7481deb4 2266 return;
a17f091d
NB		 2267 }
2268 list_del(&se_cmd->se_cmd_list);
ccf5ae83 2269 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2270
7481deb4
NB		 2271 se_cmd->se_tfo->release_cmd(se_cmd);
2272}
2273
2274/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2275 * @se_sess: session to reference
2276 * @se_cmd: command descriptor to drop
2277 */
2278int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2279{
ccf5ae83
JE		 2280 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2281 &se_sess->sess_cmd_lock);
a17f091d
NB		 2282}
2283EXPORT_SYMBOL(target_put_sess_cmd);
2284
1c7b13fe
RD		 2285/* target_sess_cmd_list_set_waiting - Flag all commands in
2286 * sess_cmd_list to complete cmd_wait_comp. Set
2287 * sess_tearing_down so no more commands are queued.
2288 * @se_sess: session to flag
a17f091d 2289 */
1c7b13fe 2290void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2291{
2292 struct se_cmd *se_cmd;
2293 unsigned long flags;
2294
a17f091d 2295 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2296 if (se_sess->sess_tearing_down) {
2297 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2298 return;
2299 }
1c7b13fe 2300 se_sess->sess_tearing_down = 1;
9b31a328 2301 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2302
9b31a328 2303 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
a17f091d
NB		 2304 se_cmd->cmd_wait_set = 1;
2305
2306 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2307}
1c7b13fe 2308EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2309
2310/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2311 * @se_sess: session to wait for active I/O
a17f091d 2312 */
be646c2d 2313void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2314{
2315 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2316 unsigned long flags;
a17f091d
NB		 2317
2318 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2319 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2320 list_del(&se_cmd->se_cmd_list);
2321
2322 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2323 " %d\n", se_cmd, se_cmd->t_state,
2324 se_cmd->se_tfo->get_cmd_state(se_cmd));
2325
be646c2d
JE		 2326 wait_for_completion(&se_cmd->cmd_wait_comp);
2327 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2328 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2329 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2330
2331 se_cmd->se_tfo->release_cmd(se_cmd);
2332 }
9b31a328
NB		 2333
2334 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2335 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2336 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2337
a17f091d
NB		 2338}
2339EXPORT_SYMBOL(target_wait_for_sess_cmds);
2340
c66ac9db
NB		 2341/* transport_lun_wait_for_tasks():
2342 *
2343 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2344 * an struct se_lun to be successfully shutdown.
2345 */
2346static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2347{
2348 unsigned long flags;
cf572a96
CH		 2349 int ret = 0;
2350
c66ac9db
NB		 2351 /*
2352 * If the frontend has already requested this struct se_cmd to
2353 * be stopped, we can safely ignore this struct se_cmd.
2354 */
a1d8b49a 2355 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 2356 if (cmd->transport_state & CMD_T_STOP) {
2357 cmd->transport_state &= ~CMD_T_LUN_STOP;
2358
2359 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2360 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2361 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
862e6389 2362 transport_cmd_check_stop(cmd, false, false);
e3d6f909 2363 return -EPERM;
c66ac9db 2364 }
7d680f3b 2365 cmd->transport_state |= CMD_T_LUN_FE_STOP;
a1d8b49a 2366 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2367
cf572a96
CH		 2368 // XXX: audit task_flags checks.
2369 spin_lock_irqsave(&cmd->t_state_lock, flags);
2370 if ((cmd->transport_state & CMD_T_BUSY) &&
2371 (cmd->transport_state & CMD_T_SENT)) {
2372 if (!target_stop_cmd(cmd, &flags))
2373 ret++;
cf572a96 2374 }
5f41a31d 2375 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2376
785fdf70
CH		 2377 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2378 " %d\n", cmd, ret);
c66ac9db 2379 if (!ret) {
6708bb27 2380 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 2381 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2382 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 2383 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 2384 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2385 }
c66ac9db
NB		 2386
2387 return 0;
2388}
2389
c66ac9db
NB		 2390static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2391{
2392 struct se_cmd *cmd = NULL;
2393 unsigned long lun_flags, cmd_flags;
2394 /*
2395 * Do exception processing and return CHECK_CONDITION status to the
2396 * Initiator Port.
2397 */
2398 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 2399 while (!list_empty(&lun->lun_cmd_list)) {
2400 cmd = list_first_entry(&lun->lun_cmd_list,
2401 struct se_cmd, se_lun_node);
3d26fea0 2402 list_del_init(&cmd->se_lun_node);
5951146d 2403
a1d8b49a 2404 spin_lock(&cmd->t_state_lock);
6708bb27 2405 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 2406 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 2407 cmd->se_lun->unpacked_lun,
2408 cmd->se_tfo->get_task_tag(cmd));
7d680f3b 2409 cmd->transport_state |= CMD_T_LUN_STOP;
a1d8b49a 2410 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 2411
2412 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2413
6708bb27
AG		 2414 if (!cmd->se_lun) {
2415 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 2416 cmd->se_tfo->get_task_tag(cmd),
2417 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 2418 BUG();
2419 }
2420 /*
2421 * If the Storage engine still owns the iscsi_cmd_t, determine
2422 * and/or stop its context.
2423 */
6708bb27 2424 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 2425 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2426 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2427
e3d6f909 2428 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 2429 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2430 continue;
2431 }
2432
6708bb27 2433 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 2434 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 2435 cmd->se_lun->unpacked_lun,
2436 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2437
a1d8b49a 2438 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2439 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
a1d8b49a 2440 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2441 goto check_cond;
2442 }
7d680f3b 2443 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 2444 target_remove_from_state_list(cmd);
a1d8b49a 2445 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db 2446
c66ac9db
NB		 2447 /*
2448 * The Storage engine stopped this struct se_cmd before it was
2449 * send to the fabric frontend for delivery back to the
2450 * Initiator Node. Return this SCSI CDB back with an
2451 * CHECK_CONDITION status.
2452 */
2453check_cond:
2454 transport_send_check_condition_and_sense(cmd,
2455 TCM_NON_EXISTENT_LUN, 0);
2456 /*
2457 * If the fabric frontend is waiting for this iscsi_cmd_t to
2458 * be released, notify the waiting thread now that LU has
2459 * finished accessing it.
2460 */
a1d8b49a 2461 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2462 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
6708bb27 2463 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 2464 " struct se_cmd: %p ITT: 0x%08x\n",
2465 lun->unpacked_lun,
e3d6f909 2466 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2467
a1d8b49a 2468 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db 2469 cmd_flags);
862e6389 2470 transport_cmd_check_stop(cmd, false, false);
a1d8b49a 2471 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 2472 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2473 continue;
2474 }
6708bb27 2475 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 2476 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2477
a1d8b49a 2478 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2479 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2480 }
2481 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2482}
2483
2484static int transport_clear_lun_thread(void *p)
2485{
8359cf43 2486 struct se_lun *lun = p;
c66ac9db
NB		 2487
2488 __transport_clear_lun_from_sessions(lun);
2489 complete(&lun->lun_shutdown_comp);
2490
2491 return 0;
2492}
2493
2494int transport_clear_lun_from_sessions(struct se_lun *lun)
2495{
2496 struct task_struct *kt;
2497
5951146d 2498 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 2499 "tcm_cl_%u", lun->unpacked_lun);
2500 if (IS_ERR(kt)) {
6708bb27 2501 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2502 return PTR_ERR(kt);
c66ac9db
NB		 2503 }
2504 wait_for_completion(&lun->lun_shutdown_comp);
2505
2506 return 0;
2507}
2508
d14921d6
NB		 2509/**
2510 * transport_wait_for_tasks - wait for completion to occur
2511 * @cmd: command to wait
c66ac9db 2512 *
d14921d6
NB		 2513 * Called from frontend fabric context to wait for storage engine
2514 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2515 */
a17f091d 2516bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2517{
2518 unsigned long flags;
2519
a1d8b49a 2520 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2521 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2522 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2523 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2524 return false;
d14921d6 2525 }
cb4f4d3c 2526
c8e31f26
AG		 2527 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2528 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2529 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2530 return false;
d14921d6 2531 }
c66ac9db
NB		 2532 /*
2533 * If we are already stopped due to an external event (ie: LUN shutdown)
2534 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 2535 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 2536 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2537 * has completed its operation on the struct se_cmd.
2538 */
7d680f3b 2539 if (cmd->transport_state & CMD_T_LUN_STOP) {
6708bb27 2540 pr_debug("wait_for_tasks: Stopping"
e3d6f909 2541 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 2542 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 2543 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 2544 /*
2545 * There is a special case for WRITES where a FE exception +
2546 * LUN shutdown means ConfigFS context is still sleeping on
2547 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2548 * We go ahead and up transport_lun_stop_comp just to be sure
2549 * here.
2550 */
a1d8b49a
AG		 2551 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2552 complete(&cmd->transport_lun_stop_comp);
2553 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2554 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2555
cf572a96 2556 target_remove_from_state_list(cmd);
c66ac9db
NB		 2557 /*
2558 * At this point, the frontend who was the originator of this
2559 * struct se_cmd, now owns the structure and can be released through
2560 * normal means below.
2561 */
6708bb27 2562 pr_debug("wait_for_tasks: Stopped"
e3d6f909 2563 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 2564 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 2565 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2566
7d680f3b 2567 cmd->transport_state &= ~CMD_T_LUN_STOP;
c66ac9db 2568 }
7d680f3b 2569
3d28934a 2570 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2571 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2572 return false;
d14921d6 2573 }
c66ac9db 2574
7d680f3b 2575 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2576
6708bb27 2577 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 2578 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 2579 cmd, cmd->se_tfo->get_task_tag(cmd),
2580 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2581
a1d8b49a 2582 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2583
a1d8b49a 2584 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2585
a1d8b49a 2586 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2587 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2588
35d1efe8 2589 pr_debug("wait_for_tasks: Stopped wait_for_completion("
a1d8b49a 2590 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 2591 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2592
d14921d6 2593 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2594
2595 return true;
c66ac9db 2596}
d14921d6 2597EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2598
2599static int transport_get_sense_codes(
2600 struct se_cmd *cmd,
2601 u8 *asc,
2602 u8 *ascq)
2603{
2604 *asc = cmd->scsi_asc;
2605 *ascq = cmd->scsi_ascq;
2606
2607 return 0;
2608}
2609
de103c93
CH		 2610int
2611transport_send_check_condition_and_sense(struct se_cmd *cmd,
2612 sense_reason_t reason, int from_transport)
c66ac9db
NB		 2613{
2614 unsigned char *buffer = cmd->sense_buffer;
2615 unsigned long flags;
c66ac9db
NB		 2616 u8 asc = 0, ascq = 0;
2617
a1d8b49a 2618 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2619 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2620 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2621 return 0;
2622 }
2623 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2624 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2625
2626 if (!reason && from_transport)
2627 goto after_reason;
2628
2629 if (!from_transport)
2630 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
9c58b7dd 2631
c66ac9db
NB		 2632 /*
2633 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2634 * SENSE KEY values from include/scsi/scsi.h
2635 */
2636 switch (reason) {
ba829137
HR		 2637 case TCM_NO_SENSE:
2638 /* CURRENT ERROR */
2639 buffer[0] = 0x70;
2640 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2641 /* Not Ready */
2642 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2643 /* NO ADDITIONAL SENSE INFORMATION */
2644 buffer[SPC_ASC_KEY_OFFSET] = 0;
2645 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2646 break;
c66ac9db 2647 case TCM_NON_EXISTENT_LUN:
eb39d340 2648 /* CURRENT ERROR */
9c58b7dd
RD		 2649 buffer[0] = 0x70;
2650 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340 2651 /* ILLEGAL REQUEST */
9c58b7dd 2652 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
eb39d340 2653 /* LOGICAL UNIT NOT SUPPORTED */
9c58b7dd 2654 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
eb39d340 2655 break;
c66ac9db
NB		 2656 case TCM_UNSUPPORTED_SCSI_OPCODE:
2657 case TCM_SECTOR_COUNT_TOO_MANY:
2658 /* CURRENT ERROR */
9c58b7dd
RD		 2659 buffer[0] = 0x70;
2660 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2661 /* ILLEGAL REQUEST */
9c58b7dd 2662 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2663 /* INVALID COMMAND OPERATION CODE */
9c58b7dd 2664 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
c66ac9db
NB		 2665 break;
2666 case TCM_UNKNOWN_MODE_PAGE:
2667 /* CURRENT ERROR */
9c58b7dd
RD		 2668 buffer[0] = 0x70;
2669 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2670 /* ILLEGAL REQUEST */
9c58b7dd 2671 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2672 /* INVALID FIELD IN CDB */
9c58b7dd 2673 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2674 break;
2675 case TCM_CHECK_CONDITION_ABORT_CMD:
2676 /* CURRENT ERROR */
9c58b7dd
RD		 2677 buffer[0] = 0x70;
2678 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2679 /* ABORTED COMMAND */
9c58b7dd 2680 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2681 /* BUS DEVICE RESET FUNCTION OCCURRED */
9c58b7dd
RD		 2682 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2683 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
c66ac9db
NB		 2684 break;
2685 case TCM_INCORRECT_AMOUNT_OF_DATA:
2686 /* CURRENT ERROR */
9c58b7dd
RD		 2687 buffer[0] = 0x70;
2688 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2689 /* ABORTED COMMAND */
9c58b7dd 2690 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2691 /* WRITE ERROR */
9c58b7dd 2692 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2693 /* NOT ENOUGH UNSOLICITED DATA */
9c58b7dd 2694 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
c66ac9db
NB		 2695 break;
2696 case TCM_INVALID_CDB_FIELD:
2697 /* CURRENT ERROR */
9c58b7dd
RD		 2698 buffer[0] = 0x70;
2699 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2700 /* ILLEGAL REQUEST */
9c58b7dd 2701 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2702 /* INVALID FIELD IN CDB */
9c58b7dd 2703 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2704 break;
2705 case TCM_INVALID_PARAMETER_LIST:
2706 /* CURRENT ERROR */
9c58b7dd
RD		 2707 buffer[0] = 0x70;
2708 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2709 /* ILLEGAL REQUEST */
9c58b7dd 2710 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2711 /* INVALID FIELD IN PARAMETER LIST */
9c58b7dd 2712 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
c66ac9db 2713 break;
bb992e72
RD		 2714 case TCM_PARAMETER_LIST_LENGTH_ERROR:
2715 /* CURRENT ERROR */
2716 buffer[0] = 0x70;
2717 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2718 /* ILLEGAL REQUEST */
2719 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2720 /* PARAMETER LIST LENGTH ERROR */
2721 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2722 break;
c66ac9db
NB		 2723 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2724 /* CURRENT ERROR */
9c58b7dd
RD		 2725 buffer[0] = 0x70;
2726 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2727 /* ABORTED COMMAND */
9c58b7dd 2728 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2729 /* WRITE ERROR */
9c58b7dd 2730 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2731 /* UNEXPECTED_UNSOLICITED_DATA */
9c58b7dd 2732 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
c66ac9db
NB		 2733 break;
2734 case TCM_SERVICE_CRC_ERROR:
2735 /* CURRENT ERROR */
9c58b7dd
RD		 2736 buffer[0] = 0x70;
2737 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2738 /* ABORTED COMMAND */
9c58b7dd 2739 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2740 /* PROTOCOL SERVICE CRC ERROR */
9c58b7dd 2741 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
c66ac9db 2742 /* N/A */
9c58b7dd 2743 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
c66ac9db
NB		 2744 break;
2745 case TCM_SNACK_REJECTED:
2746 /* CURRENT ERROR */
9c58b7dd
RD		 2747 buffer[0] = 0x70;
2748 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2749 /* ABORTED COMMAND */
9c58b7dd 2750 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2751 /* READ ERROR */
9c58b7dd 2752 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
c66ac9db 2753 /* FAILED RETRANSMISSION REQUEST */
9c58b7dd 2754 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
c66ac9db
NB		 2755 break;
2756 case TCM_WRITE_PROTECTED:
2757 /* CURRENT ERROR */
9c58b7dd
RD		 2758 buffer[0] = 0x70;
2759 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2760 /* DATA PROTECT */
9c58b7dd 2761 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
c66ac9db 2762 /* WRITE PROTECTED */
9c58b7dd 2763 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
c66ac9db 2764 break;
e2397c70
RD		 2765 case TCM_ADDRESS_OUT_OF_RANGE:
2766 /* CURRENT ERROR */
9c58b7dd
RD		 2767 buffer[0] = 0x70;
2768 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
e2397c70 2769 /* ILLEGAL REQUEST */
9c58b7dd 2770 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
e2397c70 2771 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
9c58b7dd 2772 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
e2397c70 2773 break;
c66ac9db
NB		 2774 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2775 /* CURRENT ERROR */
9c58b7dd
RD		 2776 buffer[0] = 0x70;
2777 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2778 /* UNIT ATTENTION */
9c58b7dd 2779 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
c66ac9db 2780 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
9c58b7dd
RD		 2781 buffer[SPC_ASC_KEY_OFFSET] = asc;
2782 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2783 break;
2784 case TCM_CHECK_CONDITION_NOT_READY:
2785 /* CURRENT ERROR */
9c58b7dd
RD		 2786 buffer[0] = 0x70;
2787 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2788 /* Not Ready */
9c58b7dd 2789 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2790 transport_get_sense_codes(cmd, &asc, &ascq);
9c58b7dd
RD		 2791 buffer[SPC_ASC_KEY_OFFSET] = asc;
2792 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db 2793 break;
818b571c
NB		 2794 case TCM_MISCOMPARE_VERIFY:
2795 /* CURRENT ERROR */
2796 buffer[0] = 0x70;
2797 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2798 buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE;
2799 /* MISCOMPARE DURING VERIFY OPERATION */
2800 buffer[SPC_ASC_KEY_OFFSET] = 0x1d;
2801 buffer[SPC_ASCQ_KEY_OFFSET] = 0x00;
2802 break;
c66ac9db
NB		 2803 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2804 default:
2805 /* CURRENT ERROR */
9c58b7dd
RD		 2806 buffer[0] = 0x70;
2807 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
ad673282
JE		 2808 /*
2809 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2810 * Solaris initiators. Returning NOT READY instead means the
2811 * operations will be retried a finite number of times and we
2812 * can survive intermittent errors.
2813 */
2814 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2815 /* LOGICAL UNIT COMMUNICATION FAILURE */
18a9df42 2816 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
c66ac9db
NB		 2817 break;
2818 }
2819 /*
2820 * This code uses linux/include/scsi/scsi.h SAM status codes!
2821 */
2822 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2823 /*
2824 * Automatically padded, this value is encoded in the fabric's
2825 * data_length response PDU containing the SCSI defined sense data.
2826 */
9c58b7dd 2827 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
c66ac9db
NB		 2828
2829after_reason:
e5c0d6ad 2830 trace_target_cmd_complete(cmd);
07bde79a 2831 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2832}
2833EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2834
2835int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2836{
c18bc7d8
RD		 2837 if (!(cmd->transport_state & CMD_T_ABORTED))
2838 return 0;
c66ac9db 2839
c18bc7d8
RD		 2840 if (!send_status || (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
2841 return 1;
8b1e1244 2842
c18bc7d8
RD		 2843 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2844 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2845
c18bc7d8 2846 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e5c0d6ad 2847 trace_target_cmd_complete(cmd);
c18bc7d8
RD		 2848 cmd->se_tfo->queue_status(cmd);
2849
2850 return 1;
c66ac9db
NB		 2851}
2852EXPORT_SYMBOL(transport_check_aborted_status);
2853
2854void transport_send_task_abort(struct se_cmd *cmd)
2855{
c252f003
NB		 2856 unsigned long flags;
2857
2858 spin_lock_irqsave(&cmd->t_state_lock, flags);
3ea160b3 2859 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION | SCF_SENT_DELAYED_TAS)) {
c252f003
NB		 2860 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2861 return;
2862 }
2863 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2864
c66ac9db
NB		 2865 /*
2866 * If there are still expected incoming fabric WRITEs, we wait
2867 * until until they have completed before sending a TASK_ABORTED
2868 * response. This response with TASK_ABORTED status will be
2869 * queued back to fabric module by transport_check_aborted_status().
2870 */
2871 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2872 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 2873 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 2874 smp_mb__after_atomic_inc();
c66ac9db
NB		 2875 }
2876 }
2877 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 2878
72b59d6e
RD		 2879 transport_lun_remove_cmd(cmd);
2880
6708bb27 2881 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 2882 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 2883 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2884
e5c0d6ad 2885 trace_target_cmd_complete(cmd);
e3d6f909 2886 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2887}
2888
af877292 2889static void target_tmr_work(struct work_struct *work)
c66ac9db 2890{
af877292 2891 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 2892 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2893 struct se_tmr_req *tmr = cmd->se_tmr_req;
2894 int ret;
2895
2896 switch (tmr->function) {
5c6cd613 2897 case TMR_ABORT_TASK:
3d28934a 2898 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 2899 break;
5c6cd613
NB		 2900 case TMR_ABORT_TASK_SET:
2901 case TMR_CLEAR_ACA:
2902 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 2903 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2904 break;
5c6cd613 2905 case TMR_LUN_RESET:
c66ac9db
NB		 2906 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2907 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2908 TMR_FUNCTION_REJECTED;
2909 break;
5c6cd613 2910 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 2911 tmr->response = TMR_FUNCTION_REJECTED;
2912 break;
5c6cd613 2913 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 2914 tmr->response = TMR_FUNCTION_REJECTED;
2915 break;
c66ac9db 2916 default:
6708bb27 2917 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 2918 tmr->function);
2919 tmr->response = TMR_FUNCTION_REJECTED;
2920 break;
2921 }
2922
2923 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 2924 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 2925
b7b8bef7 2926 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 2927}
2928
af877292
CH		 2929int transport_generic_handle_tmr(
2930 struct se_cmd *cmd)
c66ac9db 2931{
af877292
CH		 2932 INIT_WORK(&cmd->work, target_tmr_work);
2933 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 2934 return 0;
2935}
af877292 2936EXPORT_SYMBOL(transport_generic_handle_tmr);
Linux kernel - Deliverables
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