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target: Add percpu refcounting for se_lun access
[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 *
4c76251e 6 * (c) Copyright 2002-2013 Datera, Inc.
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);
d5ddad41 70static int transport_put_cmd(struct se_cmd *cmd);
35e0e757 71static void target_complete_ok_work(struct work_struct *work);
c66ac9db 72
e3d6f909 73int init_se_kmem_caches(void)
c66ac9db 74{
c66ac9db
NB		 75 se_sess_cache = kmem_cache_create("se_sess_cache",
76 sizeof(struct se_session), __alignof__(struct se_session),
77 0, NULL);
6708bb27
AG		 78 if (!se_sess_cache) {
79 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 80 " failed\n");
c8e31f26 81 goto out;
c66ac9db
NB		 82 }
83 se_ua_cache = kmem_cache_create("se_ua_cache",
84 sizeof(struct se_ua), __alignof__(struct se_ua),
85 0, NULL);
6708bb27
AG		 86 if (!se_ua_cache) {
87 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 88 goto out_free_sess_cache;
c66ac9db 89 }
c66ac9db
NB		 90 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
91 sizeof(struct t10_pr_registration),
92 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 93 if (!t10_pr_reg_cache) {
94 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 95 " failed\n");
35e0e757 96 goto out_free_ua_cache;
c66ac9db
NB		 97 }
98 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
99 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
100 0, NULL);
6708bb27
AG		 101 if (!t10_alua_lu_gp_cache) {
102 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 103 " failed\n");
35e0e757 104 goto out_free_pr_reg_cache;
c66ac9db
NB		 105 }
106 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
107 sizeof(struct t10_alua_lu_gp_member),
108 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 109 if (!t10_alua_lu_gp_mem_cache) {
110 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 111 "cache failed\n");
35e0e757 112 goto out_free_lu_gp_cache;
c66ac9db
NB		 113 }
114 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
115 sizeof(struct t10_alua_tg_pt_gp),
116 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 117 if (!t10_alua_tg_pt_gp_cache) {
118 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 119 "cache failed\n");
35e0e757 120 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 121 }
122 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
123 "t10_alua_tg_pt_gp_mem_cache",
124 sizeof(struct t10_alua_tg_pt_gp_member),
125 __alignof__(struct t10_alua_tg_pt_gp_member),
126 0, NULL);
6708bb27
AG		 127 if (!t10_alua_tg_pt_gp_mem_cache) {
128 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 129 "mem_t failed\n");
35e0e757 130 goto out_free_tg_pt_gp_cache;
c66ac9db
NB		 131 }
132
35e0e757
CH		 133 target_completion_wq = alloc_workqueue("target_completion",
134 WQ_MEM_RECLAIM, 0);
135 if (!target_completion_wq)
136 goto out_free_tg_pt_gp_mem_cache;
137
c66ac9db 138 return 0;
35e0e757
CH		 139
140out_free_tg_pt_gp_mem_cache:
141 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
142out_free_tg_pt_gp_cache:
143 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
144out_free_lu_gp_mem_cache:
145 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
146out_free_lu_gp_cache:
147 kmem_cache_destroy(t10_alua_lu_gp_cache);
148out_free_pr_reg_cache:
149 kmem_cache_destroy(t10_pr_reg_cache);
150out_free_ua_cache:
151 kmem_cache_destroy(se_ua_cache);
152out_free_sess_cache:
153 kmem_cache_destroy(se_sess_cache);
c66ac9db 154out:
e3d6f909 155 return -ENOMEM;
c66ac9db
NB		 156}
157
e3d6f909 158void release_se_kmem_caches(void)
c66ac9db 159{
35e0e757 160 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 161 kmem_cache_destroy(se_sess_cache);
162 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 163 kmem_cache_destroy(t10_pr_reg_cache);
164 kmem_cache_destroy(t10_alua_lu_gp_cache);
165 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
166 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
167 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 168}
169
e3d6f909
AG		 170/* This code ensures unique mib indexes are handed out. */
171static DEFINE_SPINLOCK(scsi_mib_index_lock);
172static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 173
174/*
175 * Allocate a new row index for the entry type specified
176 */
177u32 scsi_get_new_index(scsi_index_t type)
178{
179 u32 new_index;
180
e3d6f909 181 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 182
e3d6f909
AG		 183 spin_lock(&scsi_mib_index_lock);
184 new_index = ++scsi_mib_index[type];
185 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 186
187 return new_index;
188}
189
dbc5623e 190void transport_subsystem_check_init(void)
c66ac9db
NB		 191{
192 int ret;
283669d2 193 static int sub_api_initialized;
c66ac9db 194
dbc5623e
NB		 195 if (sub_api_initialized)
196 return;
197
c66ac9db
NB		 198 ret = request_module("target_core_iblock");
199 if (ret != 0)
6708bb27 200 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 201
202 ret = request_module("target_core_file");
203 if (ret != 0)
6708bb27 204 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 205
206 ret = request_module("target_core_pscsi");
207 if (ret != 0)
6708bb27 208 pr_err("Unable to load target_core_pscsi\n");
c66ac9db 209
e3d6f909 210 sub_api_initialized = 1;
c66ac9db
NB		 211}
212
213struct se_session *transport_init_session(void)
214{
215 struct se_session *se_sess;
216
217 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 218 if (!se_sess) {
219 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 220 " se_sess_cache\n");
221 return ERR_PTR(-ENOMEM);
222 }
223 INIT_LIST_HEAD(&se_sess->sess_list);
224 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d 225 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
9b31a328 226 INIT_LIST_HEAD(&se_sess->sess_wait_list);
a17f091d 227 spin_lock_init(&se_sess->sess_cmd_lock);
41ac82b6 228 kref_init(&se_sess->sess_kref);
c66ac9db
NB		 229
230 return se_sess;
231}
232EXPORT_SYMBOL(transport_init_session);
233
c0add7fd
NB		 234int transport_alloc_session_tags(struct se_session *se_sess,
235 unsigned int tag_num, unsigned int tag_size)
236{
237 int rc;
238
239 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size, GFP_KERNEL);
240 if (!se_sess->sess_cmd_map) {
241 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
242 return -ENOMEM;
243 }
244
245 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
246 if (rc < 0) {
247 pr_err("Unable to init se_sess->sess_tag_pool,"
248 " tag_num: %u\n", tag_num);
249 kfree(se_sess->sess_cmd_map);
250 se_sess->sess_cmd_map = NULL;
251 return -ENOMEM;
252 }
253
254 return 0;
255}
256EXPORT_SYMBOL(transport_alloc_session_tags);
257
258struct se_session *transport_init_session_tags(unsigned int tag_num,
259 unsigned int tag_size)
260{
261 struct se_session *se_sess;
262 int rc;
263
264 se_sess = transport_init_session();
265 if (IS_ERR(se_sess))
266 return se_sess;
267
268 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
269 if (rc < 0) {
270 transport_free_session(se_sess);
271 return ERR_PTR(-ENOMEM);
272 }
273
274 return se_sess;
275}
276EXPORT_SYMBOL(transport_init_session_tags);
277
c66ac9db 278/*
140854cb 279 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 280 */
281void __transport_register_session(
282 struct se_portal_group *se_tpg,
283 struct se_node_acl *se_nacl,
284 struct se_session *se_sess,
285 void *fabric_sess_ptr)
286{
287 unsigned char buf[PR_REG_ISID_LEN];
288
289 se_sess->se_tpg = se_tpg;
290 se_sess->fabric_sess_ptr = fabric_sess_ptr;
291 /*
292 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
293 *
294 * Only set for struct se_session's that will actually be moving I/O.
295 * eg: *NOT* discovery sessions.
296 */
297 if (se_nacl) {
298 /*
299 * If the fabric module supports an ISID based TransportID,
300 * save this value in binary from the fabric I_T Nexus now.
301 */
e3d6f909 302 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 303 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 304 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 305 &buf[0], PR_REG_ISID_LEN);
306 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
307 }
afb999ff
NB		 308 kref_get(&se_nacl->acl_kref);
309
c66ac9db
NB		 310 spin_lock_irq(&se_nacl->nacl_sess_lock);
311 /*
312 * The se_nacl->nacl_sess pointer will be set to the
313 * last active I_T Nexus for each struct se_node_acl.
314 */
315 se_nacl->nacl_sess = se_sess;
316
317 list_add_tail(&se_sess->sess_acl_list,
318 &se_nacl->acl_sess_list);
319 spin_unlock_irq(&se_nacl->nacl_sess_lock);
320 }
321 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
322
6708bb27 323 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 324 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 325}
326EXPORT_SYMBOL(__transport_register_session);
327
328void transport_register_session(
329 struct se_portal_group *se_tpg,
330 struct se_node_acl *se_nacl,
331 struct se_session *se_sess,
332 void *fabric_sess_ptr)
333{
140854cb
NB		 334 unsigned long flags;
335
336 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 337 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 338 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 339}
340EXPORT_SYMBOL(transport_register_session);
341
ecf0dd66 342static void target_release_session(struct kref *kref)
41ac82b6
NB		 343{
344 struct se_session *se_sess = container_of(kref,
345 struct se_session, sess_kref);
346 struct se_portal_group *se_tpg = se_sess->se_tpg;
347
348 se_tpg->se_tpg_tfo->close_session(se_sess);
349}
350
351void target_get_session(struct se_session *se_sess)
352{
353 kref_get(&se_sess->sess_kref);
354}
355EXPORT_SYMBOL(target_get_session);
356
33933a0e 357void target_put_session(struct se_session *se_sess)
41ac82b6 358{
4149268e
JE		 359 struct se_portal_group *tpg = se_sess->se_tpg;
360
361 if (tpg->se_tpg_tfo->put_session != NULL) {
362 tpg->se_tpg_tfo->put_session(se_sess);
363 return;
364 }
33933a0e 365 kref_put(&se_sess->sess_kref, target_release_session);
41ac82b6
NB		 366}
367EXPORT_SYMBOL(target_put_session);
368
afb999ff
NB		 369static void target_complete_nacl(struct kref *kref)
370{
371 struct se_node_acl *nacl = container_of(kref,
372 struct se_node_acl, acl_kref);
373
374 complete(&nacl->acl_free_comp);
375}
376
377void target_put_nacl(struct se_node_acl *nacl)
378{
379 kref_put(&nacl->acl_kref, target_complete_nacl);
380}
381
c66ac9db
NB		 382void transport_deregister_session_configfs(struct se_session *se_sess)
383{
384 struct se_node_acl *se_nacl;
23388864 385 unsigned long flags;
c66ac9db
NB		 386 /*
387 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
388 */
389 se_nacl = se_sess->se_node_acl;
6708bb27 390 if (se_nacl) {
23388864 391 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 392 if (se_nacl->acl_stop == 0)
393 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 394 /*
395 * If the session list is empty, then clear the pointer.
396 * Otherwise, set the struct se_session pointer from the tail
397 * element of the per struct se_node_acl active session list.
398 */
399 if (list_empty(&se_nacl->acl_sess_list))
400 se_nacl->nacl_sess = NULL;
401 else {
402 se_nacl->nacl_sess = container_of(
403 se_nacl->acl_sess_list.prev,
404 struct se_session, sess_acl_list);
405 }
23388864 406 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 407 }
408}
409EXPORT_SYMBOL(transport_deregister_session_configfs);
410
411void transport_free_session(struct se_session *se_sess)
412{
c0add7fd
NB		 413 if (se_sess->sess_cmd_map) {
414 percpu_ida_destroy(&se_sess->sess_tag_pool);
415 kfree(se_sess->sess_cmd_map);
416 }
c66ac9db
NB		 417 kmem_cache_free(se_sess_cache, se_sess);
418}
419EXPORT_SYMBOL(transport_free_session);
420
421void transport_deregister_session(struct se_session *se_sess)
422{
423 struct se_portal_group *se_tpg = se_sess->se_tpg;
01468346 424 struct target_core_fabric_ops *se_tfo;
c66ac9db 425 struct se_node_acl *se_nacl;
e63a8e19 426 unsigned long flags;
01468346 427 bool comp_nacl = true;
c66ac9db 428
6708bb27 429 if (!se_tpg) {
c66ac9db
NB		 430 transport_free_session(se_sess);
431 return;
432 }
01468346 433 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 434
e63a8e19 435 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 436 list_del(&se_sess->sess_list);
437 se_sess->se_tpg = NULL;
438 se_sess->fabric_sess_ptr = NULL;
e63a8e19 439 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 440
441 /*
442 * Determine if we need to do extra work for this initiator node's
443 * struct se_node_acl if it had been previously dynamically generated.
444 */
445 se_nacl = se_sess->se_node_acl;
01468346
NB		 446
447 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
448 if (se_nacl && se_nacl->dynamic_node_acl) {
449 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
450 list_del(&se_nacl->acl_list);
451 se_tpg->num_node_acls--;
452 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
453 core_tpg_wait_for_nacl_pr_ref(se_nacl);
454 core_free_device_list_for_node(se_nacl, se_tpg);
455 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
456
457 comp_nacl = false;
458 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 459 }
c66ac9db 460 }
01468346 461 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db 462
6708bb27 463 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 464 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 465 /*
afb999ff
NB		 466 * If last kref is dropping now for an explict NodeACL, awake sleeping
467 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
468 * removal context.
01468346
NB		 469 */
470 if (se_nacl && comp_nacl == true)
afb999ff 471 target_put_nacl(se_nacl);
01468346 472
afb999ff 473 transport_free_session(se_sess);
c66ac9db
NB		 474}
475EXPORT_SYMBOL(transport_deregister_session);
476
477/*
a1d8b49a 478 * Called with cmd->t_state_lock held.
c66ac9db 479 */
cf572a96 480static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 481{
42bf829e 482 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 483 unsigned long flags;
484
42bf829e
CH		 485 if (!dev)
486 return;
c66ac9db 487
cf572a96
CH		 488 if (cmd->transport_state & CMD_T_BUSY)
489 return;
c66ac9db 490
cf572a96
CH		 491 spin_lock_irqsave(&dev->execute_task_lock, flags);
492 if (cmd->state_active) {
493 list_del(&cmd->state_list);
cf572a96 494 cmd->state_active = false;
c66ac9db 495 }
cf572a96 496 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 497}
498
862e6389
NB		 499static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
500 bool write_pending)
c66ac9db
NB		 501{
502 unsigned long flags;
503
a1d8b49a 504 spin_lock_irqsave(&cmd->t_state_lock, flags);
862e6389
NB		 505 if (write_pending)
506 cmd->t_state = TRANSPORT_WRITE_PENDING;
507
c66ac9db
NB		 508 /*
509 * Determine if IOCTL context caller in requesting the stopping of this
510 * command for LUN shutdown purposes.
511 */
7d680f3b
CH		 512 if (cmd->transport_state & CMD_T_LUN_STOP) {
513 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
514 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 515
7d680f3b 516 cmd->transport_state &= ~CMD_T_ACTIVE;
f7113a47 517 if (remove_from_lists)
cf572a96 518 target_remove_from_state_list(cmd);
a1d8b49a 519 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 520
a1d8b49a 521 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 522 return 1;
523 }
f7113a47
CH		 524
525 if (remove_from_lists) {
526 target_remove_from_state_list(cmd);
527
528 /*
529 * Clear struct se_cmd->se_lun before the handoff to FE.
530 */
531 cmd->se_lun = NULL;
532 }
533
c66ac9db
NB		 534 /*
535 * Determine if frontend context caller is requesting the stopping of
e3d6f909 536 * this command for frontend exceptions.
c66ac9db 537 */
7d680f3b
CH		 538 if (cmd->transport_state & CMD_T_STOP) {
539 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
540 __func__, __LINE__,
e3d6f909 541 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 542
a1d8b49a 543 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 544
a1d8b49a 545 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 546 return 1;
547 }
f7113a47
CH		 548
549 cmd->transport_state &= ~CMD_T_ACTIVE;
550 if (remove_from_lists) {
551 /*
552 * Some fabric modules like tcm_loop can release
553 * their internally allocated I/O reference now and
554 * struct se_cmd now.
555 *
556 * Fabric modules are expected to return '1' here if the
557 * se_cmd being passed is released at this point,
558 * or zero if not being released.
559 */
560 if (cmd->se_tfo->check_stop_free != NULL) {
561 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
562 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 563 }
f7113a47 564 }
c66ac9db 565
a1d8b49a 566 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 567 return 0;
568}
569
570static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
571{
862e6389 572 return transport_cmd_check_stop(cmd, true, false);
c66ac9db
NB		 573}
574
575static void transport_lun_remove_cmd(struct se_cmd *cmd)
576{
e3d6f909 577 struct se_lun *lun = cmd->se_lun;
c66ac9db 578
5277797d 579 if (!lun || !cmd->lun_ref_active)
c66ac9db
NB		 580 return;
581
5277797d 582 percpu_ref_put(&lun->lun_ref);
c66ac9db
NB		 583}
584
585void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
586{
c66ac9db
NB		 587 if (transport_cmd_check_stop_to_fabric(cmd))
588 return;
af877292 589 if (remove)
e6a2573f 590 transport_put_cmd(cmd);
c66ac9db
NB		 591}
592
35e0e757
CH		 593static void target_complete_failure_work(struct work_struct *work)
594{
595 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
596
de103c93
CH		 597 transport_generic_request_failure(cmd,
598 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 599}
600
6138ed2a 601/*
d5829eac
PB		 602 * Used when asking transport to copy Sense Data from the underlying
603 * Linux/SCSI struct scsi_cmnd
6138ed2a 604 */
d5829eac 605static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 606{
6138ed2a 607 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 608
609 WARN_ON(!cmd->se_lun);
610
611 if (!dev)
d5829eac 612 return NULL;
6138ed2a 613
d5829eac
PB		 614 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
615 return NULL;
6138ed2a 616
9c58b7dd 617 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 618
d5829eac 619 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 620 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 621 return cmd->sense_buffer;
6138ed2a
PB		 622}
623
5787cacd 624void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 625{
42bf829e 626 struct se_device *dev = cmd->se_dev;
5787cacd 627 int success = scsi_status == GOOD;
c66ac9db 628 unsigned long flags;
c66ac9db 629
5787cacd
CH		 630 cmd->scsi_status = scsi_status;
631
632
a1d8b49a 633 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 634 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 635
c66ac9db 636 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 637 dev->transport->transport_complete(cmd,
638 cmd->t_data_sg,
639 transport_get_sense_buffer(cmd));
640 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 641 success = 1;
c66ac9db
NB		 642 }
643
644 /*
5787cacd 645 * See if we are waiting to complete for an exception condition.
c66ac9db 646 */
cf572a96 647 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 648 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 649 complete(&cmd->task_stop_comp);
c66ac9db
NB		 650 return;
651 }
2235007c
CH		 652
653 if (!success)
7d680f3b 654 cmd->transport_state |= CMD_T_FAILED;
2235007c 655
3d28934a
NB		 656 /*
657 * Check for case where an explict ABORT_TASK has been received
658 * and transport_wait_for_tasks() will be waiting for completion..
659 */
660 if (cmd->transport_state & CMD_T_ABORTED &&
661 cmd->transport_state & CMD_T_STOP) {
662 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
663 complete(&cmd->t_transport_stop_comp);
664 return;
665 } else if (cmd->transport_state & CMD_T_FAILED) {
35e0e757 666 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 667 } else {
35e0e757 668 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 669 }
35e0e757 670
35e0e757 671 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 672 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 673 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 674
35e0e757 675 queue_work(target_completion_wq, &cmd->work);
c66ac9db 676}
6bb35e00
CH		 677EXPORT_SYMBOL(target_complete_cmd);
678
cf572a96 679static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 680{
cf572a96
CH		 681 struct se_device *dev = cmd->se_dev;
682 unsigned long flags;
c66ac9db 683
cf572a96
CH		 684 spin_lock_irqsave(&dev->execute_task_lock, flags);
685 if (!cmd->state_active) {
686 list_add_tail(&cmd->state_list, &dev->state_list);
687 cmd->state_active = true;
c66ac9db 688 }
cf572a96 689 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 690}
691
07bde79a 692/*
f147abb4 693 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 694 */
7a6f0a1e
CH		 695static void transport_write_pending_qf(struct se_cmd *cmd);
696static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 697
0fd97ccf 698void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 699{
700 struct se_device *dev = container_of(work, struct se_device,
701 qf_work_queue);
bcac364a 702 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 703 struct se_cmd *cmd, *cmd_tmp;
704
705 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 706 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
707 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 708
bcac364a 709 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 710 list_del(&cmd->se_qf_node);
711 atomic_dec(&dev->dev_qf_count);
712 smp_mb__after_atomic_dec();
07bde79a 713
6708bb27 714 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 715 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 716 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 717 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
718 : "UNKNOWN");
f7a5cc0b 719
7a6f0a1e
CH		 720 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
721 transport_write_pending_qf(cmd);
722 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
723 transport_complete_qf(cmd);
07bde79a 724 }
07bde79a
NB		 725}
726
c66ac9db
NB		 727unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
728{
729 switch (cmd->data_direction) {
730 case DMA_NONE:
731 return "NONE";
732 case DMA_FROM_DEVICE:
733 return "READ";
734 case DMA_TO_DEVICE:
735 return "WRITE";
736 case DMA_BIDIRECTIONAL:
737 return "BIDI";
738 default:
739 break;
740 }
741
742 return "UNKNOWN";
743}
744
745void transport_dump_dev_state(
746 struct se_device *dev,
747 char *b,
748 int *bl)
749{
750 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 751 if (dev->export_count)
c66ac9db 752 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 753 else
c66ac9db 754 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 755
5f41a31d 756 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 757 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 758 dev->dev_attrib.block_size,
759 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 760 *bl += sprintf(b + *bl, " ");
761}
762
c66ac9db
NB		 763void transport_dump_vpd_proto_id(
764 struct t10_vpd *vpd,
765 unsigned char *p_buf,
766 int p_buf_len)
767{
768 unsigned char buf[VPD_TMP_BUF_SIZE];
769 int len;
770
771 memset(buf, 0, VPD_TMP_BUF_SIZE);
772 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
773
774 switch (vpd->protocol_identifier) {
775 case 0x00:
776 sprintf(buf+len, "Fibre Channel\n");
777 break;
778 case 0x10:
779 sprintf(buf+len, "Parallel SCSI\n");
780 break;
781 case 0x20:
782 sprintf(buf+len, "SSA\n");
783 break;
784 case 0x30:
785 sprintf(buf+len, "IEEE 1394\n");
786 break;
787 case 0x40:
788 sprintf(buf+len, "SCSI Remote Direct Memory Access"
789 " Protocol\n");
790 break;
791 case 0x50:
792 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
793 break;
794 case 0x60:
795 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
796 break;
797 case 0x70:
798 sprintf(buf+len, "Automation/Drive Interface Transport"
799 " Protocol\n");
800 break;
801 case 0x80:
802 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
803 break;
804 default:
805 sprintf(buf+len, "Unknown 0x%02x\n",
806 vpd->protocol_identifier);
807 break;
808 }
809
810 if (p_buf)
811 strncpy(p_buf, buf, p_buf_len);
812 else
6708bb27 813 pr_debug("%s", buf);
c66ac9db
NB		 814}
815
816void
817transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
818{
819 /*
820 * Check if the Protocol Identifier Valid (PIV) bit is set..
821 *
822 * from spc3r23.pdf section 7.5.1
823 */
824 if (page_83[1] & 0x80) {
825 vpd->protocol_identifier = (page_83[0] & 0xf0);
826 vpd->protocol_identifier_set = 1;
827 transport_dump_vpd_proto_id(vpd, NULL, 0);
828 }
829}
830EXPORT_SYMBOL(transport_set_vpd_proto_id);
831
832int transport_dump_vpd_assoc(
833 struct t10_vpd *vpd,
834 unsigned char *p_buf,
835 int p_buf_len)
836{
837 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 838 int ret = 0;
839 int len;
c66ac9db
NB		 840
841 memset(buf, 0, VPD_TMP_BUF_SIZE);
842 len = sprintf(buf, "T10 VPD Identifier Association: ");
843
844 switch (vpd->association) {
845 case 0x00:
846 sprintf(buf+len, "addressed logical unit\n");
847 break;
848 case 0x10:
849 sprintf(buf+len, "target port\n");
850 break;
851 case 0x20:
852 sprintf(buf+len, "SCSI target device\n");
853 break;
854 default:
855 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 856 ret = -EINVAL;
c66ac9db
NB		 857 break;
858 }
859
860 if (p_buf)
861 strncpy(p_buf, buf, p_buf_len);
862 else
6708bb27 863 pr_debug("%s", buf);
c66ac9db
NB		 864
865 return ret;
866}
867
868int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
869{
870 /*
871 * The VPD identification association..
872 *
873 * from spc3r23.pdf Section 7.6.3.1 Table 297
874 */
875 vpd->association = (page_83[1] & 0x30);
876 return transport_dump_vpd_assoc(vpd, NULL, 0);
877}
878EXPORT_SYMBOL(transport_set_vpd_assoc);
879
880int transport_dump_vpd_ident_type(
881 struct t10_vpd *vpd,
882 unsigned char *p_buf,
883 int p_buf_len)
884{
885 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 886 int ret = 0;
887 int len;
c66ac9db
NB		 888
889 memset(buf, 0, VPD_TMP_BUF_SIZE);
890 len = sprintf(buf, "T10 VPD Identifier Type: ");
891
892 switch (vpd->device_identifier_type) {
893 case 0x00:
894 sprintf(buf+len, "Vendor specific\n");
895 break;
896 case 0x01:
897 sprintf(buf+len, "T10 Vendor ID based\n");
898 break;
899 case 0x02:
900 sprintf(buf+len, "EUI-64 based\n");
901 break;
902 case 0x03:
903 sprintf(buf+len, "NAA\n");
904 break;
905 case 0x04:
906 sprintf(buf+len, "Relative target port identifier\n");
907 break;
908 case 0x08:
909 sprintf(buf+len, "SCSI name string\n");
910 break;
911 default:
912 sprintf(buf+len, "Unsupported: 0x%02x\n",
913 vpd->device_identifier_type);
e3d6f909 914 ret = -EINVAL;
c66ac9db
NB		 915 break;
916 }
917
e3d6f909
AG		 918 if (p_buf) {
919 if (p_buf_len < strlen(buf)+1)
920 return -EINVAL;
c66ac9db 921 strncpy(p_buf, buf, p_buf_len);
e3d6f909 922 } else {
6708bb27 923 pr_debug("%s", buf);
e3d6f909 924 }
c66ac9db
NB		 925
926 return ret;
927}
928
929int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
930{
931 /*
932 * The VPD identifier type..
933 *
934 * from spc3r23.pdf Section 7.6.3.1 Table 298
935 */
936 vpd->device_identifier_type = (page_83[1] & 0x0f);
937 return transport_dump_vpd_ident_type(vpd, NULL, 0);
938}
939EXPORT_SYMBOL(transport_set_vpd_ident_type);
940
941int transport_dump_vpd_ident(
942 struct t10_vpd *vpd,
943 unsigned char *p_buf,
944 int p_buf_len)
945{
946 unsigned char buf[VPD_TMP_BUF_SIZE];
947 int ret = 0;
948
949 memset(buf, 0, VPD_TMP_BUF_SIZE);
950
951 switch (vpd->device_identifier_code_set) {
952 case 0x01: /* Binary */
703d641d
DC		 953 snprintf(buf, sizeof(buf),
954 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 955 &vpd->device_identifier[0]);
956 break;
957 case 0x02: /* ASCII */
703d641d
DC		 958 snprintf(buf, sizeof(buf),
959 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 960 &vpd->device_identifier[0]);
961 break;
962 case 0x03: /* UTF-8 */
703d641d
DC		 963 snprintf(buf, sizeof(buf),
964 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 965 &vpd->device_identifier[0]);
966 break;
967 default:
968 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
969 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 970 ret = -EINVAL;
c66ac9db
NB		 971 break;
972 }
973
974 if (p_buf)
975 strncpy(p_buf, buf, p_buf_len);
976 else
6708bb27 977 pr_debug("%s", buf);
c66ac9db
NB		 978
979 return ret;
980}
981
982int
983transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
984{
985 static const char hex_str[] = "0123456789abcdef";
35d1efe8 986 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 987
988 /*
989 * The VPD Code Set (encoding)
990 *
991 * from spc3r23.pdf Section 7.6.3.1 Table 296
992 */
993 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
994 switch (vpd->device_identifier_code_set) {
995 case 0x01: /* Binary */
996 vpd->device_identifier[j++] =
997 hex_str[vpd->device_identifier_type];
998 while (i < (4 + page_83[3])) {
999 vpd->device_identifier[j++] =
1000 hex_str[(page_83[i] & 0xf0) >> 4];
1001 vpd->device_identifier[j++] =
1002 hex_str[page_83[i] & 0x0f];
1003 i++;
1004 }
1005 break;
1006 case 0x02: /* ASCII */
1007 case 0x03: /* UTF-8 */
1008 while (i < (4 + page_83[3]))
1009 vpd->device_identifier[j++] = page_83[i++];
1010 break;
1011 default:
1012 break;
1013 }
1014
1015 return transport_dump_vpd_ident(vpd, NULL, 0);
1016}
1017EXPORT_SYMBOL(transport_set_vpd_ident);
1018
de103c93
CH		 1019sense_reason_t
1020target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1021{
1022 struct se_device *dev = cmd->se_dev;
1023
1024 if (cmd->unknown_data_length) {
1025 cmd->data_length = size;
1026 } else if (size != cmd->data_length) {
1027 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1028 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1029 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1030 cmd->data_length, size, cmd->t_task_cdb[0]);
1031
9b3b8041
CH		 1032 if (cmd->data_direction == DMA_TO_DEVICE) {
1033 pr_err("Rejecting underflow/overflow"
1034 " WRITE data\n");
de103c93 1035 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 1036 }
1037 /*
1038 * Reject READ_* or WRITE_* with overflow/underflow for
1039 * type SCF_SCSI_DATA_CDB.
1040 */
0fd97ccf 1041 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1042 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1043 " CDB on non 512-byte sector setup subsystem"
1044 " plugin: %s\n", dev->transport->name);
1045 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1046 return TCM_INVALID_CDB_FIELD;
9b3b8041 1047 }
4c054ba6
NB		 1048 /*
1049 * For the overflow case keep the existing fabric provided
1050 * ->data_length. Otherwise for the underflow case, reset
1051 * ->data_length to the smaller SCSI expected data transfer
1052 * length.
1053 */
9b3b8041
CH		 1054 if (size > cmd->data_length) {
1055 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1056 cmd->residual_count = (size - cmd->data_length);
1057 } else {
1058 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1059 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1060 cmd->data_length = size;
9b3b8041 1061 }
9b3b8041
CH		 1062 }
1063
1064 return 0;
1065
9b3b8041
CH		 1066}
1067
c66ac9db
NB		 1068/*
1069 * Used by fabric modules containing a local struct se_cmd within their
1070 * fabric dependent per I/O descriptor.
1071 */
1072void transport_init_se_cmd(
1073 struct se_cmd *cmd,
1074 struct target_core_fabric_ops *tfo,
1075 struct se_session *se_sess,
1076 u32 data_length,
1077 int data_direction,
1078 int task_attr,
1079 unsigned char *sense_buffer)
1080{
5951146d
AG		 1081 INIT_LIST_HEAD(&cmd->se_lun_node);
1082 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1083 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1084 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1085 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a
AG		 1086 init_completion(&cmd->transport_lun_fe_stop_comp);
1087 init_completion(&cmd->transport_lun_stop_comp);
1088 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1089 init_completion(&cmd->cmd_wait_comp);
cf572a96 1090 init_completion(&cmd->task_stop_comp);
a1d8b49a 1091 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1092 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1093
1094 cmd->se_tfo = tfo;
1095 cmd->se_sess = se_sess;
1096 cmd->data_length = data_length;
1097 cmd->data_direction = data_direction;
1098 cmd->sam_task_attr = task_attr;
1099 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1100
1101 cmd->state_active = false;
c66ac9db
NB		 1102}
1103EXPORT_SYMBOL(transport_init_se_cmd);
1104
de103c93
CH		 1105static sense_reason_t
1106transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1107{
019c4ca6
CH		 1108 struct se_device *dev = cmd->se_dev;
1109
c66ac9db
NB		 1110 /*
1111 * Check if SAM Task Attribute emulation is enabled for this
1112 * struct se_device storage object
1113 */
019c4ca6 1114 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 1115 return 0;
1116
e66ecd50 1117 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1118 pr_debug("SAM Task Attribute ACA"
c66ac9db 1119 " emulation is not supported\n");
de103c93 1120 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1121 }
1122 /*
1123 * Used to determine when ORDERED commands should go from
1124 * Dormant to Active status.
1125 */
019c4ca6 1126 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
c66ac9db 1127 smp_mb__after_atomic_inc();
6708bb27 1128 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1129 cmd->se_ordered_id, cmd->sam_task_attr,
019c4ca6 1130 dev->transport->name);
c66ac9db
NB		 1131 return 0;
1132}
1133
de103c93
CH		 1134sense_reason_t
1135target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1136{
0fd97ccf 1137 struct se_device *dev = cmd->se_dev;
de103c93 1138 sense_reason_t ret;
c66ac9db 1139
c66ac9db
NB		 1140 /*
1141 * Ensure that the received CDB is less than the max (252 + 8) bytes
1142 * for VARIABLE_LENGTH_CMD
1143 */
1144 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1145 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1146 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1147 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1148 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1149 }
1150 /*
1151 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1152 * allocate the additional extended CDB buffer now.. Otherwise
1153 * setup the pointer from __t_task_cdb to t_task_cdb.
1154 */
a1d8b49a
AG		 1155 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1156 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1157 GFP_KERNEL);
6708bb27
AG		 1158 if (!cmd->t_task_cdb) {
1159 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1160 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1161 scsi_command_size(cdb),
a1d8b49a 1162 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1163 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1164 }
1165 } else
a1d8b49a 1166 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1167 /*
a1d8b49a 1168 * Copy the original CDB into cmd->
c66ac9db 1169 */
a1d8b49a 1170 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1171
e5c0d6ad
RD		 1172 trace_target_sequencer_start(cmd);
1173
cb4f4d3c
CH		 1174 /*
1175 * Check for an existing UNIT ATTENTION condition
1176 */
de103c93
CH		 1177 ret = target_scsi3_ua_check(cmd);
1178 if (ret)
1179 return ret;
cb4f4d3c 1180
c87fbd56 1181 ret = target_alua_state_check(cmd);
de103c93
CH		 1182 if (ret)
1183 return ret;
cb4f4d3c 1184
d977f437 1185 ret = target_check_reservation(cmd);
f85eda8d
NB		 1186 if (ret) {
1187 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
d977f437 1188 return ret;
f85eda8d 1189 }
cb4f4d3c 1190
0fd97ccf 1191 ret = dev->transport->parse_cdb(cmd);
de103c93
CH		 1192 if (ret)
1193 return ret;
1194
1195 ret = transport_check_alloc_task_attr(cmd);
1196 if (ret)
c66ac9db 1197 return ret;
cb4f4d3c 1198
cb4f4d3c 1199 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
cb4f4d3c 1200
c66ac9db
NB		 1201 spin_lock(&cmd->se_lun->lun_sep_lock);
1202 if (cmd->se_lun->lun_sep)
1203 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1204 spin_unlock(&cmd->se_lun->lun_sep_lock);
1205 return 0;
1206}
a12f41f8 1207EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1208
695434e1
NB		 1209/*
1210 * Used by fabric module frontends to queue tasks directly.
1211 * Many only be used from process context only
1212 */
1213int transport_handle_cdb_direct(
1214 struct se_cmd *cmd)
1215{
de103c93 1216 sense_reason_t ret;
dd8ae59d 1217
695434e1
NB		 1218 if (!cmd->se_lun) {
1219 dump_stack();
6708bb27 1220 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1221 return -EINVAL;
1222 }
1223 if (in_interrupt()) {
1224 dump_stack();
6708bb27 1225 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1226 " from interrupt context\n");
1227 return -EINVAL;
1228 }
dd8ae59d 1229 /*
af877292
CH		 1230 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1231 * outstanding descriptors are handled correctly during shutdown via
1232 * transport_wait_for_tasks()
dd8ae59d
NB		 1233 *
1234 * Also, we don't take cmd->t_state_lock here as we only expect
1235 * this to be called for initial descriptor submission.
1236 */
1237 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1238 cmd->transport_state |= CMD_T_ACTIVE;
1239
dd8ae59d
NB		 1240 /*
1241 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1242 * so follow TRANSPORT_NEW_CMD processing thread context usage
1243 * and call transport_generic_request_failure() if necessary..
1244 */
1245 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1246 if (ret)
1247 transport_generic_request_failure(cmd, ret);
dd8ae59d 1248 return 0;
695434e1
NB		 1249}
1250EXPORT_SYMBOL(transport_handle_cdb_direct);
1251
c5ff8d6b 1252sense_reason_t
de103c93
CH		 1253transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1254 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1255{
1256 if (!sgl || !sgl_count)
1257 return 0;
1258
1259 /*
1260 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1261 * scatterlists already have been set to follow what the fabric
1262 * passes for the original expected data transfer length.
1263 */
1264 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1265 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1266 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1267 return TCM_INVALID_CDB_FIELD;
1268 }
1269
1270 cmd->t_data_sg = sgl;
1271 cmd->t_data_nents = sgl_count;
1272
1273 if (sgl_bidi && sgl_bidi_count) {
1274 cmd->t_bidi_data_sg = sgl_bidi;
1275 cmd->t_bidi_data_nents = sgl_bidi_count;
1276 }
1277 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1278 return 0;
1279}
1280
a026757f
NB		 1281/*
1282 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1283 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1284 *
1285 * @se_cmd: command descriptor to submit
1286 * @se_sess: associated se_sess for endpoint
1287 * @cdb: pointer to SCSI CDB
1288 * @sense: pointer to SCSI sense buffer
1289 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1290 * @data_length: fabric expected data transfer length
1291 * @task_addr: SAM task attribute
1292 * @data_dir: DMA data direction
1293 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1294 * @sgl: struct scatterlist memory for unidirectional mapping
1295 * @sgl_count: scatterlist count for unidirectional mapping
1296 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1297 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
a6360785 1298 *
d6dfc868
RD		 1299 * Returns non zero to signal active I/O shutdown failure. All other
1300 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1301 * but still return zero here.
1302 *
a6360785
NB		 1303 * This may only be called from process context, and also currently
1304 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1305 */
1306int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785 1307 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
a026757f
NB		 1308 u32 data_length, int task_attr, int data_dir, int flags,
1309 struct scatterlist *sgl, u32 sgl_count,
1310 struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
a6360785
NB		 1311{
1312 struct se_portal_group *se_tpg;
de103c93
CH		 1313 sense_reason_t rc;
1314 int ret;
a6360785
NB		 1315
1316 se_tpg = se_sess->se_tpg;
1317 BUG_ON(!se_tpg);
1318 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1319 BUG_ON(in_interrupt());
1320 /*
1321 * Initialize se_cmd for target operation. From this point
1322 * exceptions are handled by sending exception status via
1323 * target_core_fabric_ops->queue_status() callback
1324 */
1325 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1326 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1327 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1328 se_cmd->unknown_data_length = 1;
a6360785
NB		 1329 /*
1330 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1331 * se_sess->sess_cmd_list. A second kref_get here is necessary
1332 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1333 * kref_put() to happen during fabric packet acknowledgement.
1334 */
de103c93
CH		 1335 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1336 if (ret)
1337 return ret;
a6360785
NB		 1338 /*
1339 * Signal bidirectional data payloads to target-core
1340 */
1341 if (flags & TARGET_SCF_BIDI_OP)
1342 se_cmd->se_cmd_flags |= SCF_BIDI;
1343 /*
1344 * Locate se_lun pointer and attach it to struct se_cmd
1345 */
de103c93
CH		 1346 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1347 if (rc) {
1348 transport_send_check_condition_and_sense(se_cmd, rc, 0);
735703ca 1349 target_put_sess_cmd(se_sess, se_cmd);
d6dfc868 1350 return 0;
735703ca 1351 }
d6e0175c 1352
a12f41f8 1353 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
735703ca 1354 if (rc != 0) {
de103c93 1355 transport_generic_request_failure(se_cmd, rc);
d6dfc868 1356 return 0;
735703ca 1357 }
a026757f
NB		 1358 /*
1359 * When a non zero sgl_count has been passed perform SGL passthrough
1360 * mapping for pre-allocated fabric memory instead of having target
1361 * core perform an internal SGL allocation..
1362 */
1363 if (sgl_count != 0) {
1364 BUG_ON(!sgl);
1365
944981c7
NB		 1366 /*
1367 * A work-around for tcm_loop as some userspace code via
1368 * scsi-generic do not memset their associated read buffers,
1369 * so go ahead and do that here for type non-data CDBs. Also
1370 * note that this is currently guaranteed to be a single SGL
1371 * for this case by target core in target_setup_cmd_from_cdb()
1372 * -> transport_generic_cmd_sequencer().
1373 */
1374 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1375 se_cmd->data_direction == DMA_FROM_DEVICE) {
1376 unsigned char *buf = NULL;
1377
1378 if (sgl)
1379 buf = kmap(sg_page(sgl)) + sgl->offset;
1380
1381 if (buf) {
1382 memset(buf, 0, sgl->length);
1383 kunmap(sg_page(sgl));
1384 }
1385 }
1386
a026757f
NB		 1387 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1388 sgl_bidi, sgl_bidi_count);
1389 if (rc != 0) {
de103c93 1390 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1391 return 0;
1392 }
1393 }
11e319ed
AG		 1394 /*
1395 * Check if we need to delay processing because of ALUA
1396 * Active/NonOptimized primary access state..
1397 */
1398 core_alua_check_nonop_delay(se_cmd);
1399
a6360785 1400 transport_handle_cdb_direct(se_cmd);
d6dfc868 1401 return 0;
a6360785 1402}
a026757f
NB		 1403EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1404
1405/*
1406 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1407 *
1408 * @se_cmd: command descriptor to submit
1409 * @se_sess: associated se_sess for endpoint
1410 * @cdb: pointer to SCSI CDB
1411 * @sense: pointer to SCSI sense buffer
1412 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1413 * @data_length: fabric expected data transfer length
1414 * @task_addr: SAM task attribute
1415 * @data_dir: DMA data direction
1416 * @flags: flags for command submission from target_sc_flags_tables
1417 *
1418 * Returns non zero to signal active I/O shutdown failure. All other
1419 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1420 * but still return zero here.
1421 *
1422 * This may only be called from process context, and also currently
1423 * assumes internal allocation of fabric payload buffer by target-core.
1424 *
1425 * It also assumes interal target core SGL memory allocation.
1426 */
1427int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1428 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1429 u32 data_length, int task_attr, int data_dir, int flags)
1430{
1431 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1432 unpacked_lun, data_length, task_attr, data_dir,
1433 flags, NULL, 0, NULL, 0);
1434}
a6360785
NB		 1435EXPORT_SYMBOL(target_submit_cmd);
1436
9f0d05c2
NB		 1437static void target_complete_tmr_failure(struct work_struct *work)
1438{
1439 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1440
1441 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1442 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1443
1444 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1445}
1446
ea98d7f9
AG		 1447/**
1448 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1449 * for TMR CDBs
1450 *
1451 * @se_cmd: command descriptor to submit
1452 * @se_sess: associated se_sess for endpoint
1453 * @sense: pointer to SCSI sense buffer
1454 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1455 * @fabric_context: fabric context for TMR req
1456 * @tm_type: Type of TM request
c0974f89
NB		 1457 * @gfp: gfp type for caller
1458 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1459 * @flags: submit cmd flags
ea98d7f9
AG		 1460 *
1461 * Callable from all contexts.
1462 **/
1463
c7042cae 1464int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1465 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1466 void *fabric_tmr_ptr, unsigned char tm_type,
1467 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1468{
1469 struct se_portal_group *se_tpg;
1470 int ret;
1471
1472 se_tpg = se_sess->se_tpg;
1473 BUG_ON(!se_tpg);
1474
1475 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1476 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1477 /*
1478 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1479 * allocation failure.
1480 */
c0974f89 1481 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1482 if (ret < 0)
1483 return -ENOMEM;
ea98d7f9 1484
c0974f89
NB		 1485 if (tm_type == TMR_ABORT_TASK)
1486 se_cmd->se_tmr_req->ref_task_tag = tag;
1487
ea98d7f9 1488 /* See target_submit_cmd for commentary */
bc187ea6
RD		 1489 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1490 if (ret) {
1491 core_tmr_release_req(se_cmd->se_tmr_req);
1492 return ret;
1493 }
ea98d7f9 1494
ea98d7f9
AG		 1495 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1496 if (ret) {
9f0d05c2
NB		 1497 /*
1498 * For callback during failure handling, push this work off
1499 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1500 */
1501 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1502 schedule_work(&se_cmd->work);
c7042cae 1503 return 0;
ea98d7f9
AG		 1504 }
1505 transport_generic_handle_tmr(se_cmd);
c7042cae 1506 return 0;
ea98d7f9
AG		 1507}
1508EXPORT_SYMBOL(target_submit_tmr);
1509
cdbb70bb 1510/*
cf572a96 1511 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1512 * has completed.
1513 */
cf572a96 1514bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cdbb70bb 1515{
cdbb70bb
CH		 1516 bool was_active = false;
1517
cf572a96
CH		 1518 if (cmd->transport_state & CMD_T_BUSY) {
1519 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1520 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1521
cf572a96
CH		 1522 pr_debug("cmd %p waiting to complete\n", cmd);
1523 wait_for_completion(&cmd->task_stop_comp);
1524 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1525
1526 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1527 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1528 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1529 was_active = true;
1530 }
1531
cdbb70bb
CH		 1532 return was_active;
1533}
1534
c66ac9db
NB		 1535/*
1536 * Handle SAM-esque emulation for generic transport request failures.
1537 */
de103c93
CH		 1538void transport_generic_request_failure(struct se_cmd *cmd,
1539 sense_reason_t sense_reason)
c66ac9db 1540{
07bde79a
NB		 1541 int ret = 0;
1542
6708bb27 1543 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1544 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1545 cmd->t_task_cdb[0]);
de103c93 1546 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1547 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1548 cmd->t_state, sense_reason);
d43d6aea 1549 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1550 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1551 (cmd->transport_state & CMD_T_STOP) != 0,
1552 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1553
c66ac9db
NB		 1554 /*
1555 * For SAM Task Attribute emulation for failed struct se_cmd
1556 */
019c4ca6 1557 transport_complete_task_attr(cmd);
cf6d1f09
NB		 1558 /*
1559 * Handle special case for COMPARE_AND_WRITE failure, where the
1560 * callback is expected to drop the per device ->caw_mutex.
1561 */
1562 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1563 cmd->transport_complete_callback)
1564 cmd->transport_complete_callback(cmd);
c66ac9db 1565
de103c93 1566 switch (sense_reason) {
03e98c9e
NB		 1567 case TCM_NON_EXISTENT_LUN:
1568 case TCM_UNSUPPORTED_SCSI_OPCODE:
1569 case TCM_INVALID_CDB_FIELD:
1570 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1571 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1572 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1573 case TCM_UNKNOWN_MODE_PAGE:
1574 case TCM_WRITE_PROTECTED:
e2397c70 1575 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1576 case TCM_CHECK_CONDITION_ABORT_CMD:
1577 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1578 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1579 break;
de103c93
CH		 1580 case TCM_OUT_OF_RESOURCES:
1581 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1582 break;
03e98c9e 1583 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1584 /*
1585 * No SENSE Data payload for this case, set SCSI Status
1586 * and queue the response to $FABRIC_MOD.
1587 *
1588 * Uses linux/include/scsi/scsi.h SAM status codes defs
1589 */
1590 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1591 /*
1592 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1593 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1594 * CONFLICT STATUS.
1595 *
1596 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1597 */
e3d6f909 1598 if (cmd->se_sess &&
0fd97ccf 1599 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
e3d6f909 1600 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1601 cmd->orig_fe_lun, 0x2C,
1602 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1603
e5c0d6ad
RD		 1604 trace_target_cmd_complete(cmd);
1605 ret = cmd->se_tfo-> queue_status(cmd);
f147abb4 1606 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1607 goto queue_full;
c66ac9db 1608 goto check_stop;
c66ac9db 1609 default:
6708bb27 1610 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1611 cmd->t_task_cdb[0], sense_reason);
1612 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1613 break;
1614 }
f3146437 1615
de103c93 1616 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1617 if (ret == -EAGAIN || ret == -ENOMEM)
1618 goto queue_full;
07bde79a 1619
c66ac9db
NB		 1620check_stop:
1621 transport_lun_remove_cmd(cmd);
6708bb27 1622 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1623 ;
07bde79a
NB		 1624 return;
1625
1626queue_full:
e057f533
CH		 1627 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1628 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1629}
2fbff127 1630EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1631
76dde50e 1632void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1633{
de103c93 1634 sense_reason_t ret;
5f41a31d 1635
de103c93
CH		 1636 if (cmd->execute_cmd) {
1637 ret = cmd->execute_cmd(cmd);
1638 if (ret) {
1639 spin_lock_irq(&cmd->t_state_lock);
1640 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1641 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1642
de103c93
CH		 1643 transport_generic_request_failure(cmd, ret);
1644 }
5f41a31d
CH		 1645 }
1646}
1647
019c4ca6 1648static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1649{
1650 struct se_device *dev = cmd->se_dev;
1651
019c4ca6
CH		 1652 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1653 return false;
5f41a31d 1654
c66ac9db 1655 /*
25985edc 1656 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1657 * to allow the passed struct se_cmd list of tasks to the front of the list.
1658 */
5f41a31d
CH		 1659 switch (cmd->sam_task_attr) {
1660 case MSG_HEAD_TAG:
1661 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1662 "se_ordered_id: %u\n",
1663 cmd->t_task_cdb[0], cmd->se_ordered_id);
019c4ca6 1664 return false;
5f41a31d
CH		 1665 case MSG_ORDERED_TAG:
1666 atomic_inc(&dev->dev_ordered_sync);
c66ac9db
NB		 1667 smp_mb__after_atomic_inc();
1668
5f41a31d
CH		 1669 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1670 " se_ordered_id: %u\n",
1671 cmd->t_task_cdb[0], cmd->se_ordered_id);
1672
c66ac9db 1673 /*
5f41a31d
CH		 1674 * Execute an ORDERED command if no other older commands
1675 * exist that need to be completed first.
c66ac9db 1676 */
5f41a31d 1677 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1678 return false;
5f41a31d
CH		 1679 break;
1680 default:
c66ac9db
NB		 1681 /*
1682 * For SIMPLE and UNTAGGED Task Attribute commands
1683 */
5f41a31d 1684 atomic_inc(&dev->simple_cmds);
c66ac9db 1685 smp_mb__after_atomic_inc();
5f41a31d 1686 break;
c66ac9db 1687 }
5f41a31d 1688
019c4ca6
CH		 1689 if (atomic_read(&dev->dev_ordered_sync) == 0)
1690 return false;
c66ac9db 1691
019c4ca6
CH		 1692 spin_lock(&dev->delayed_cmd_lock);
1693 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1694 spin_unlock(&dev->delayed_cmd_lock);
1695
1696 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1697 " delayed CMD list, se_ordered_id: %u\n",
1698 cmd->t_task_cdb[0], cmd->sam_task_attr,
1699 cmd->se_ordered_id);
1700 return true;
1701}
1702
1703void target_execute_cmd(struct se_cmd *cmd)
1704{
1705 /*
1706 * If the received CDB has aleady been aborted stop processing it here.
1707 */
5bd665f2
LT		 1708 if (transport_check_aborted_status(cmd, 1)) {
1709 complete(&cmd->transport_lun_stop_comp);
5f41a31d 1710 return;
c66ac9db 1711 }
c66ac9db 1712
c66ac9db 1713 /*
019c4ca6
CH		 1714 * Determine if IOCTL context caller in requesting the stopping of this
1715 * command for LUN shutdown purposes.
c66ac9db 1716 */
019c4ca6
CH		 1717 spin_lock_irq(&cmd->t_state_lock);
1718 if (cmd->transport_state & CMD_T_LUN_STOP) {
1719 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1720 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1721
1722 cmd->transport_state &= ~CMD_T_ACTIVE;
1723 spin_unlock_irq(&cmd->t_state_lock);
1724 complete(&cmd->transport_lun_stop_comp);
1725 return;
1726 }
1727 /*
1728 * Determine if frontend context caller is requesting the stopping of
1729 * this command for frontend exceptions.
1730 */
1731 if (cmd->transport_state & CMD_T_STOP) {
1732 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1733 __func__, __LINE__,
1734 cmd->se_tfo->get_task_tag(cmd));
1735
1736 spin_unlock_irq(&cmd->t_state_lock);
1737 complete(&cmd->t_transport_stop_comp);
1738 return;
1739 }
1740
1741 cmd->t_state = TRANSPORT_PROCESSING;
1a398b97 1742 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
019c4ca6
CH		 1743 spin_unlock_irq(&cmd->t_state_lock);
1744
1a398b97
NB		 1745 if (target_handle_task_attr(cmd)) {
1746 spin_lock_irq(&cmd->t_state_lock);
1747 cmd->transport_state &= ~CMD_T_BUSY|CMD_T_SENT;
1748 spin_unlock_irq(&cmd->t_state_lock);
1749 return;
1750 }
1751
1752 __target_execute_cmd(cmd);
c66ac9db 1753}
70baf0ab 1754EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1755
5f41a31d
CH		 1756/*
1757 * Process all commands up to the last received ORDERED task attribute which
1758 * requires another blocking boundary
1759 */
1760static void target_restart_delayed_cmds(struct se_device *dev)
1761{
1762 for (;;) {
1763 struct se_cmd *cmd;
1764
1765 spin_lock(&dev->delayed_cmd_lock);
1766 if (list_empty(&dev->delayed_cmd_list)) {
1767 spin_unlock(&dev->delayed_cmd_lock);
1768 break;
1769 }
1770
1771 cmd = list_entry(dev->delayed_cmd_list.next,
1772 struct se_cmd, se_delayed_node);
1773 list_del(&cmd->se_delayed_node);
1774 spin_unlock(&dev->delayed_cmd_lock);
1775
1776 __target_execute_cmd(cmd);
1777
1778 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1779 break;
1780 }
1781}
1782
c66ac9db 1783/*
35e0e757 1784 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1785 * and ordered cmds need to have their tasks added to the execution queue.
1786 */
1787static void transport_complete_task_attr(struct se_cmd *cmd)
1788{
5951146d 1789 struct se_device *dev = cmd->se_dev;
c66ac9db 1790
019c4ca6
CH		 1791 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1792 return;
1793
e66ecd50 1794 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 1795 atomic_dec(&dev->simple_cmds);
1796 smp_mb__after_atomic_dec();
1797 dev->dev_cur_ordered_id++;
6708bb27 1798 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1799 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1800 cmd->se_ordered_id);
e66ecd50 1801 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 1802 dev->dev_cur_ordered_id++;
6708bb27 1803 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1804 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1805 cmd->se_ordered_id);
e66ecd50 1806 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 1807 atomic_dec(&dev->dev_ordered_sync);
1808 smp_mb__after_atomic_dec();
c66ac9db
NB		 1809
1810 dev->dev_cur_ordered_id++;
6708bb27 1811 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1812 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1813 }
c66ac9db 1814
5f41a31d 1815 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1816}
1817
e057f533 1818static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1819{
1820 int ret = 0;
1821
019c4ca6 1822 transport_complete_task_attr(cmd);
e057f533
CH		 1823
1824 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
e5c0d6ad 1825 trace_target_cmd_complete(cmd);
e057f533
CH		 1826 ret = cmd->se_tfo->queue_status(cmd);
1827 if (ret)
1828 goto out;
1829 }
07bde79a
NB		 1830
1831 switch (cmd->data_direction) {
1832 case DMA_FROM_DEVICE:
e5c0d6ad 1833 trace_target_cmd_complete(cmd);
07bde79a
NB		 1834 ret = cmd->se_tfo->queue_data_in(cmd);
1835 break;
1836 case DMA_TO_DEVICE:
64577407 1837 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a
NB		 1838 ret = cmd->se_tfo->queue_data_in(cmd);
1839 if (ret < 0)
e057f533 1840 break;
07bde79a
NB		 1841 }
1842 /* Fall through for DMA_TO_DEVICE */
1843 case DMA_NONE:
e5c0d6ad 1844 trace_target_cmd_complete(cmd);
07bde79a
NB		 1845 ret = cmd->se_tfo->queue_status(cmd);
1846 break;
1847 default:
1848 break;
1849 }
1850
e057f533
CH		 1851out:
1852 if (ret < 0) {
1853 transport_handle_queue_full(cmd, cmd->se_dev);
1854 return;
1855 }
1856 transport_lun_remove_cmd(cmd);
1857 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1858}
1859
1860static void transport_handle_queue_full(
1861 struct se_cmd *cmd,
e057f533 1862 struct se_device *dev)
07bde79a
NB		 1863{
1864 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 1865 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1866 atomic_inc(&dev->dev_qf_count);
1867 smp_mb__after_atomic_inc();
1868 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1869
1870 schedule_work(&cmd->se_dev->qf_work_queue);
1871}
1872
35e0e757 1873static void target_complete_ok_work(struct work_struct *work)
c66ac9db 1874{
35e0e757 1875 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 1876 int ret;
35e0e757 1877
c66ac9db
NB		 1878 /*
1879 * Check if we need to move delayed/dormant tasks from cmds on the
1880 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1881 * Attribute.
1882 */
019c4ca6
CH		 1883 transport_complete_task_attr(cmd);
1884
07bde79a
NB		 1885 /*
1886 * Check to schedule QUEUE_FULL work, or execute an existing
1887 * cmd->transport_qf_callback()
1888 */
1889 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1890 schedule_work(&cmd->se_dev->qf_work_queue);
1891
c66ac9db 1892 /*
d5829eac 1893 * Check if we need to send a sense buffer from
c66ac9db
NB		 1894 * the struct se_cmd in question.
1895 */
1896 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 1897 WARN_ON(!cmd->scsi_status);
27a27099
PB		 1898 ret = transport_send_check_condition_and_sense(
1899 cmd, 0, 1);
1900 if (ret == -EAGAIN || ret == -ENOMEM)
1901 goto queue_full;
1902
1903 transport_lun_remove_cmd(cmd);
1904 transport_cmd_check_stop_to_fabric(cmd);
1905 return;
c66ac9db
NB		 1906 }
1907 /*
25985edc 1908 * Check for a callback, used by amongst other things
a6b0133c 1909 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 1910 */
a6b0133c
NB		 1911 if (cmd->transport_complete_callback) {
1912 sense_reason_t rc;
1913
1914 rc = cmd->transport_complete_callback(cmd);
a2890087 1915 if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
a6b0133c 1916 return;
a2890087
NB		 1917 } else if (rc) {
1918 ret = transport_send_check_condition_and_sense(cmd,
1919 rc, 0);
1920 if (ret == -EAGAIN || ret == -ENOMEM)
1921 goto queue_full;
a6b0133c 1922
a2890087
NB		 1923 transport_lun_remove_cmd(cmd);
1924 transport_cmd_check_stop_to_fabric(cmd);
1925 return;
1926 }
a6b0133c 1927 }
c66ac9db
NB		 1928
1929 switch (cmd->data_direction) {
1930 case DMA_FROM_DEVICE:
1931 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1932 if (cmd->se_lun->lun_sep) {
1933 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1934 cmd->data_length;
1935 }
1936 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 1937
e5c0d6ad 1938 trace_target_cmd_complete(cmd);
07bde79a 1939 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1940 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1941 goto queue_full;
c66ac9db
NB		 1942 break;
1943 case DMA_TO_DEVICE:
1944 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1945 if (cmd->se_lun->lun_sep) {
1946 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 1947 cmd->data_length;
1948 }
1949 spin_unlock(&cmd->se_lun->lun_sep_lock);
1950 /*
1951 * Check if we need to send READ payload for BIDI-COMMAND
1952 */
64577407 1953 if (cmd->se_cmd_flags & SCF_BIDI) {
c66ac9db 1954 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1955 if (cmd->se_lun->lun_sep) {
1956 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1957 cmd->data_length;
1958 }
1959 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 1960 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1961 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1962 goto queue_full;
c66ac9db
NB		 1963 break;
1964 }
1965 /* Fall through for DMA_TO_DEVICE */
1966 case DMA_NONE:
e5c0d6ad 1967 trace_target_cmd_complete(cmd);
07bde79a 1968 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1969 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1970 goto queue_full;
c66ac9db
NB		 1971 break;
1972 default:
1973 break;
1974 }
1975
1976 transport_lun_remove_cmd(cmd);
1977 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1978 return;
1979
1980queue_full:
6708bb27 1981 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 1982 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 1983 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1984 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1985}
1986
6708bb27 1987static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 1988{
ec98f782 1989 struct scatterlist *sg;
ec98f782 1990 int count;
c66ac9db 1991
6708bb27
AG		 1992 for_each_sg(sgl, sg, nents, count)
1993 __free_page(sg_page(sg));
c66ac9db 1994
6708bb27
AG		 1995 kfree(sgl);
1996}
c66ac9db 1997
47e459e6
NB		 1998static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
1999{
2000 /*
2001 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2002 * emulation, and free + reset pointers if necessary..
2003 */
2004 if (!cmd->t_data_sg_orig)
2005 return;
2006
2007 kfree(cmd->t_data_sg);
2008 cmd->t_data_sg = cmd->t_data_sg_orig;
2009 cmd->t_data_sg_orig = NULL;
2010 cmd->t_data_nents = cmd->t_data_nents_orig;
2011 cmd->t_data_nents_orig = 0;
2012}
2013
6708bb27
AG		 2014static inline void transport_free_pages(struct se_cmd *cmd)
2015{
47e459e6
NB		 2016 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
2017 transport_reset_sgl_orig(cmd);
6708bb27 2018 return;
47e459e6
NB		 2019 }
2020 transport_reset_sgl_orig(cmd);
6708bb27
AG		 2021
2022 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2023 cmd->t_data_sg = NULL;
2024 cmd->t_data_nents = 0;
c66ac9db 2025
6708bb27 2026 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2027 cmd->t_bidi_data_sg = NULL;
2028 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2029}
2030
e26d99ae
CH		 2031/**
2032 * transport_release_cmd - free a command
2033 * @cmd: command to free
2034 *
2035 * This routine unconditionally frees a command, and reference counting
2036 * or list removal must be done in the caller.
2037 */
d5ddad41 2038static int transport_release_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2039{
2040 BUG_ON(!cmd->se_tfo);
2041
c8e31f26 2042 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 2043 core_tmr_release_req(cmd->se_tmr_req);
2044 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2045 kfree(cmd->t_task_cdb);
2046 /*
7481deb4
NB		 2047 * If this cmd has been setup with target_get_sess_cmd(), drop
2048 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2049 */
ca24976a 2050 return target_put_sess_cmd(cmd->se_sess, cmd);
e26d99ae
CH		 2051}
2052
d3df7825
CH		 2053/**
2054 * transport_put_cmd - release a reference to a command
2055 * @cmd: command to release
2056 *
2057 * This routine releases our reference to the command and frees it if possible.
2058 */
d5ddad41 2059static int transport_put_cmd(struct se_cmd *cmd)
c66ac9db 2060{
c66ac9db 2061 transport_free_pages(cmd);
d5ddad41 2062 return transport_release_cmd(cmd);
c66ac9db 2063}
c66ac9db 2064
4949314c 2065void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2066{
ec98f782 2067 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2068 struct page **pages;
2069 int i;
05d1c7c0
AG		 2070
2071 /*
ec98f782
AG		 2072 * We need to take into account a possible offset here for fabrics like
2073 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2074 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2075 */
4949314c
AG		 2076 if (!cmd->t_data_nents)
2077 return NULL;
3717ef0c
PB		 2078
2079 BUG_ON(!sg);
2080 if (cmd->t_data_nents == 1)
4949314c
AG		 2081 return kmap(sg_page(sg)) + sg->offset;
2082
2083 /* >1 page. use vmap */
2084 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2085 if (!pages)
4949314c
AG		 2086 return NULL;
2087
2088 /* convert sg[] to pages[] */
2089 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2090 pages[i] = sg_page(sg);
2091 }
2092
2093 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2094 kfree(pages);
de103c93 2095 if (!cmd->t_data_vmap)
4949314c
AG		 2096 return NULL;
2097
2098 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2099}
4949314c 2100EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2101
4949314c 2102void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2103{
a1edf9cf 2104 if (!cmd->t_data_nents) {
4949314c 2105 return;
a1edf9cf 2106 } else if (cmd->t_data_nents == 1) {
4949314c 2107 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2108 return;
2109 }
4949314c
AG		 2110
2111 vunmap(cmd->t_data_vmap);
2112 cmd->t_data_vmap = NULL;
05d1c7c0 2113}
4949314c 2114EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2115
c5ff8d6b 2116int
20093994
NB		 2117target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2118 bool zero_page)
c66ac9db 2119{
20093994 2120 struct scatterlist *sg;
ec98f782 2121 struct page *page;
20093994
NB		 2122 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2123 unsigned int nent;
ec98f782 2124 int i = 0;
c66ac9db 2125
20093994
NB		 2126 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2127 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2128 if (!sg)
ec98f782 2129 return -ENOMEM;
c66ac9db 2130
20093994 2131 sg_init_table(sg, nent);
9db9da33 2132
ec98f782
AG		 2133 while (length) {
2134 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2135 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2136 if (!page)
2137 goto out;
c66ac9db 2138
20093994 2139 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2140 length -= page_len;
2141 i++;
c66ac9db 2142 }
20093994
NB		 2143 *sgl = sg;
2144 *nents = nent;
c66ac9db 2145 return 0;
c66ac9db 2146
ec98f782 2147out:
d0e27c88 2148 while (i > 0) {
ec98f782 2149 i--;
20093994 2150 __free_page(sg_page(&sg[i]));
c66ac9db 2151 }
20093994 2152 kfree(sg);
ec98f782 2153 return -ENOMEM;
c66ac9db
NB		 2154}
2155
da0f7619 2156/*
b16a35b0
AG		 2157 * Allocate any required resources to execute the command. For writes we
2158 * might not have the payload yet, so notify the fabric via a call to
2159 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2160 */
de103c93
CH		 2161sense_reason_t
2162transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2163{
c66ac9db
NB		 2164 int ret = 0;
2165
2166 /*
2167 * Determine is the TCM fabric module has already allocated physical
2168 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2169 * beforehand.
c66ac9db 2170 */
ec98f782
AG		 2171 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2172 cmd->data_length) {
20093994
NB		 2173 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
2174
8cefe07b
NB		 2175 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2176 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2177 u32 bidi_length;
2178
2179 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2180 bidi_length = cmd->t_task_nolb *
2181 cmd->se_dev->dev_attrib.block_size;
2182 else
2183 bidi_length = cmd->data_length;
2184
2185 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2186 &cmd->t_bidi_data_nents,
2187 bidi_length, zero_flag);
2188 if (ret < 0)
2189 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2190 }
2191
20093994
NB		 2192 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2193 cmd->data_length, zero_flag);
c66ac9db 2194 if (ret < 0)
de103c93 2195 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2196 }
c66ac9db 2197 /*
c3196f0c
CH		 2198 * If this command is not a write we can execute it right here,
2199 * for write buffers we need to notify the fabric driver first
2200 * and let it call back once the write buffers are ready.
c66ac9db 2201 */
5f41a31d 2202 target_add_to_state_list(cmd);
c3196f0c
CH		 2203 if (cmd->data_direction != DMA_TO_DEVICE) {
2204 target_execute_cmd(cmd);
2205 return 0;
2206 }
862e6389 2207 transport_cmd_check_stop(cmd, false, true);
c3196f0c
CH		 2208
2209 ret = cmd->se_tfo->write_pending(cmd);
2210 if (ret == -EAGAIN || ret == -ENOMEM)
2211 goto queue_full;
2212
de103c93
CH		 2213 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2214 WARN_ON(ret);
2215
b69c1fcf 2216 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2217
c3196f0c
CH		 2218queue_full:
2219 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2220 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2221 transport_handle_queue_full(cmd, cmd->se_dev);
2222 return 0;
c66ac9db 2223}
a1d8b49a 2224EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2225
e057f533 2226static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2227{
f147abb4
NB		 2228 int ret;
2229
2230 ret = cmd->se_tfo->write_pending(cmd);
2231 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2232 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2233 cmd);
2234 transport_handle_queue_full(cmd, cmd->se_dev);
2235 }
07bde79a
NB		 2236}
2237
d5ddad41 2238int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2239{
c130480b 2240 unsigned long flags;
d5ddad41
NB		 2241 int ret = 0;
2242
d14921d6 2243 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2244 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2245 transport_wait_for_tasks(cmd);
2246
d5ddad41 2247 ret = transport_release_cmd(cmd);
d14921d6
NB		 2248 } else {
2249 if (wait_for_tasks)
2250 transport_wait_for_tasks(cmd);
c130480b
NB		 2251 /*
2252 * Handle WRITE failure case where transport_generic_new_cmd()
2253 * has already added se_cmd to state_list, but fabric has
2254 * failed command before I/O submission.
2255 */
2256 if (cmd->state_active) {
2257 spin_lock_irqsave(&cmd->t_state_lock, flags);
2258 target_remove_from_state_list(cmd);
2259 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2260 }
d14921d6 2261
82f1c8a4 2262 if (cmd->se_lun)
c66ac9db 2263 transport_lun_remove_cmd(cmd);
c66ac9db 2264
d5ddad41 2265 ret = transport_put_cmd(cmd);
c66ac9db 2266 }
d5ddad41 2267 return ret;
c66ac9db
NB		 2268}
2269EXPORT_SYMBOL(transport_generic_free_cmd);
2270
a17f091d
NB		 2271/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2272 * @se_sess: session to reference
2273 * @se_cmd: command descriptor to add
a6360785 2274 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2275 */
20361e69 2276int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
bc187ea6 2277 bool ack_kref)
a17f091d
NB		 2278{
2279 unsigned long flags;
bc187ea6 2280 int ret = 0;
a17f091d 2281
7481deb4 2282 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 2283 /*
2284 * Add a second kref if the fabric caller is expecting to handle
2285 * fabric acknowledgement that requires two target_put_sess_cmd()
2286 * invocations before se_cmd descriptor release.
2287 */
86715569 2288 if (ack_kref == true) {
a6360785 2289 kref_get(&se_cmd->cmd_kref);
86715569
NB		 2290 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2291 }
7481deb4 2292
a17f091d 2293 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2294 if (se_sess->sess_tearing_down) {
2295 ret = -ESHUTDOWN;
2296 goto out;
2297 }
a17f091d 2298 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2299out:
a17f091d 2300 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
bc187ea6 2301 return ret;
a17f091d 2302}
20361e69 2303EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2304
7481deb4 2305static void target_release_cmd_kref(struct kref *kref)
a17f091d 2306{
7481deb4
NB		 2307 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2308 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2309
a17f091d 2310 if (list_empty(&se_cmd->se_cmd_list)) {
ccf5ae83 2311 spin_unlock(&se_sess->sess_cmd_lock);
ffc32d52 2312 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2313 return;
a17f091d 2314 }
a17f091d 2315 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
ccf5ae83 2316 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2317 complete(&se_cmd->cmd_wait_comp);
7481deb4 2318 return;
a17f091d
NB		 2319 }
2320 list_del(&se_cmd->se_cmd_list);
ccf5ae83 2321 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2322
7481deb4
NB		 2323 se_cmd->se_tfo->release_cmd(se_cmd);
2324}
2325
2326/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2327 * @se_sess: session to reference
2328 * @se_cmd: command descriptor to drop
2329 */
2330int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2331{
ccf5ae83
JE		 2332 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2333 &se_sess->sess_cmd_lock);
a17f091d
NB		 2334}
2335EXPORT_SYMBOL(target_put_sess_cmd);
2336
1c7b13fe
RD		 2337/* target_sess_cmd_list_set_waiting - Flag all commands in
2338 * sess_cmd_list to complete cmd_wait_comp. Set
2339 * sess_tearing_down so no more commands are queued.
2340 * @se_sess: session to flag
a17f091d 2341 */
1c7b13fe 2342void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2343{
2344 struct se_cmd *se_cmd;
2345 unsigned long flags;
2346
a17f091d 2347 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2348 if (se_sess->sess_tearing_down) {
2349 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2350 return;
2351 }
1c7b13fe 2352 se_sess->sess_tearing_down = 1;
9b31a328 2353 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2354
9b31a328 2355 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
a17f091d
NB		 2356 se_cmd->cmd_wait_set = 1;
2357
2358 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2359}
1c7b13fe 2360EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2361
2362/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2363 * @se_sess: session to wait for active I/O
a17f091d 2364 */
be646c2d 2365void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2366{
2367 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2368 unsigned long flags;
a17f091d
NB		 2369
2370 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2371 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2372 list_del(&se_cmd->se_cmd_list);
2373
2374 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2375 " %d\n", se_cmd, se_cmd->t_state,
2376 se_cmd->se_tfo->get_cmd_state(se_cmd));
2377
be646c2d
JE		 2378 wait_for_completion(&se_cmd->cmd_wait_comp);
2379 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2380 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2381 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2382
2383 se_cmd->se_tfo->release_cmd(se_cmd);
2384 }
9b31a328
NB		 2385
2386 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2387 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2388 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2389
a17f091d
NB		 2390}
2391EXPORT_SYMBOL(target_wait_for_sess_cmds);
2392
c66ac9db
NB		 2393/* transport_lun_wait_for_tasks():
2394 *
2395 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2396 * an struct se_lun to be successfully shutdown.
2397 */
2398static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2399{
2400 unsigned long flags;
cf572a96
CH		 2401 int ret = 0;
2402
c66ac9db
NB		 2403 /*
2404 * If the frontend has already requested this struct se_cmd to
2405 * be stopped, we can safely ignore this struct se_cmd.
2406 */
a1d8b49a 2407 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 2408 if (cmd->transport_state & CMD_T_STOP) {
2409 cmd->transport_state &= ~CMD_T_LUN_STOP;
2410
2411 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2412 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2413 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
862e6389 2414 transport_cmd_check_stop(cmd, false, false);
e3d6f909 2415 return -EPERM;
c66ac9db 2416 }
7d680f3b 2417 cmd->transport_state |= CMD_T_LUN_FE_STOP;
a1d8b49a 2418 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2419
cf572a96
CH		 2420 // XXX: audit task_flags checks.
2421 spin_lock_irqsave(&cmd->t_state_lock, flags);
2422 if ((cmd->transport_state & CMD_T_BUSY) &&
2423 (cmd->transport_state & CMD_T_SENT)) {
2424 if (!target_stop_cmd(cmd, &flags))
2425 ret++;
cf572a96 2426 }
5f41a31d 2427 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2428
785fdf70
CH		 2429 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2430 " %d\n", cmd, ret);
c66ac9db 2431 if (!ret) {
6708bb27 2432 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 2433 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2434 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 2435 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 2436 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2437 }
c66ac9db
NB		 2438
2439 return 0;
2440}
2441
c66ac9db
NB		 2442static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2443{
2444 struct se_cmd *cmd = NULL;
2445 unsigned long lun_flags, cmd_flags;
2446 /*
2447 * Do exception processing and return CHECK_CONDITION status to the
2448 * Initiator Port.
2449 */
2450 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 2451 while (!list_empty(&lun->lun_cmd_list)) {
2452 cmd = list_first_entry(&lun->lun_cmd_list,
2453 struct se_cmd, se_lun_node);
3d26fea0 2454 list_del_init(&cmd->se_lun_node);
5951146d 2455
a1d8b49a 2456 spin_lock(&cmd->t_state_lock);
6708bb27 2457 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 2458 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 2459 cmd->se_lun->unpacked_lun,
2460 cmd->se_tfo->get_task_tag(cmd));
7d680f3b 2461 cmd->transport_state |= CMD_T_LUN_STOP;
a1d8b49a 2462 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 2463
2464 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2465
6708bb27
AG		 2466 if (!cmd->se_lun) {
2467 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 2468 cmd->se_tfo->get_task_tag(cmd),
2469 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 2470 BUG();
2471 }
2472 /*
2473 * If the Storage engine still owns the iscsi_cmd_t, determine
2474 * and/or stop its context.
2475 */
6708bb27 2476 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 2477 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2478 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2479
e3d6f909 2480 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 2481 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2482 continue;
2483 }
2484
6708bb27 2485 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 2486 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 2487 cmd->se_lun->unpacked_lun,
2488 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2489
a1d8b49a 2490 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2491 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
a1d8b49a 2492 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2493 goto check_cond;
2494 }
7d680f3b 2495 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 2496 target_remove_from_state_list(cmd);
a1d8b49a 2497 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db 2498
c66ac9db
NB		 2499 /*
2500 * The Storage engine stopped this struct se_cmd before it was
2501 * send to the fabric frontend for delivery back to the
2502 * Initiator Node. Return this SCSI CDB back with an
2503 * CHECK_CONDITION status.
2504 */
2505check_cond:
2506 transport_send_check_condition_and_sense(cmd,
2507 TCM_NON_EXISTENT_LUN, 0);
2508 /*
2509 * If the fabric frontend is waiting for this iscsi_cmd_t to
2510 * be released, notify the waiting thread now that LU has
2511 * finished accessing it.
2512 */
a1d8b49a 2513 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2514 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
6708bb27 2515 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 2516 " struct se_cmd: %p ITT: 0x%08x\n",
2517 lun->unpacked_lun,
e3d6f909 2518 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2519
a1d8b49a 2520 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db 2521 cmd_flags);
862e6389 2522 transport_cmd_check_stop(cmd, false, false);
a1d8b49a 2523 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 2524 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2525 continue;
2526 }
6708bb27 2527 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 2528 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2529
a1d8b49a 2530 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2531 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2532 }
2533 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2534}
2535
5277797d 2536static int transport_clear_lun_ref_thread(void *p)
c66ac9db 2537{
8359cf43 2538 struct se_lun *lun = p;
c66ac9db 2539
5277797d
NB		 2540 percpu_ref_kill(&lun->lun_ref);
2541
2542 wait_for_completion(&lun->lun_ref_comp);
c66ac9db
NB		 2543 complete(&lun->lun_shutdown_comp);
2544
2545 return 0;
2546}
2547
5277797d 2548int transport_clear_lun_ref(struct se_lun *lun)
c66ac9db
NB		 2549{
2550 struct task_struct *kt;
2551
5277797d 2552 kt = kthread_run(transport_clear_lun_ref_thread, lun,
c66ac9db
NB		 2553 "tcm_cl_%u", lun->unpacked_lun);
2554 if (IS_ERR(kt)) {
6708bb27 2555 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2556 return PTR_ERR(kt);
c66ac9db
NB		 2557 }
2558 wait_for_completion(&lun->lun_shutdown_comp);
2559
2560 return 0;
2561}
2562
d14921d6
NB		 2563/**
2564 * transport_wait_for_tasks - wait for completion to occur
2565 * @cmd: command to wait
c66ac9db 2566 *
d14921d6
NB		 2567 * Called from frontend fabric context to wait for storage engine
2568 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2569 */
a17f091d 2570bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2571{
2572 unsigned long flags;
2573
a1d8b49a 2574 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2575 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2576 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2577 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2578 return false;
d14921d6 2579 }
cb4f4d3c 2580
c8e31f26
AG		 2581 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2582 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2583 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2584 return false;
d14921d6 2585 }
c66ac9db
NB		 2586 /*
2587 * If we are already stopped due to an external event (ie: LUN shutdown)
2588 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 2589 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 2590 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2591 * has completed its operation on the struct se_cmd.
2592 */
7d680f3b 2593 if (cmd->transport_state & CMD_T_LUN_STOP) {
6708bb27 2594 pr_debug("wait_for_tasks: Stopping"
e3d6f909 2595 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 2596 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 2597 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 2598 /*
2599 * There is a special case for WRITES where a FE exception +
2600 * LUN shutdown means ConfigFS context is still sleeping on
2601 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2602 * We go ahead and up transport_lun_stop_comp just to be sure
2603 * here.
2604 */
a1d8b49a
AG		 2605 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2606 complete(&cmd->transport_lun_stop_comp);
2607 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2608 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2609
cf572a96 2610 target_remove_from_state_list(cmd);
c66ac9db
NB		 2611 /*
2612 * At this point, the frontend who was the originator of this
2613 * struct se_cmd, now owns the structure and can be released through
2614 * normal means below.
2615 */
6708bb27 2616 pr_debug("wait_for_tasks: Stopped"
e3d6f909 2617 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 2618 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 2619 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2620
7d680f3b 2621 cmd->transport_state &= ~CMD_T_LUN_STOP;
c66ac9db 2622 }
7d680f3b 2623
3d28934a 2624 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2625 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2626 return false;
d14921d6 2627 }
c66ac9db 2628
7d680f3b 2629 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2630
6708bb27 2631 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 2632 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 2633 cmd, cmd->se_tfo->get_task_tag(cmd),
2634 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2635
a1d8b49a 2636 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2637
a1d8b49a 2638 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2639
a1d8b49a 2640 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2641 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2642
35d1efe8 2643 pr_debug("wait_for_tasks: Stopped wait_for_completion("
a1d8b49a 2644 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 2645 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2646
d14921d6 2647 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2648
2649 return true;
c66ac9db 2650}
d14921d6 2651EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2652
2653static int transport_get_sense_codes(
2654 struct se_cmd *cmd,
2655 u8 *asc,
2656 u8 *ascq)
2657{
2658 *asc = cmd->scsi_asc;
2659 *ascq = cmd->scsi_ascq;
2660
2661 return 0;
2662}
2663
de103c93
CH		 2664int
2665transport_send_check_condition_and_sense(struct se_cmd *cmd,
2666 sense_reason_t reason, int from_transport)
c66ac9db
NB		 2667{
2668 unsigned char *buffer = cmd->sense_buffer;
2669 unsigned long flags;
c66ac9db
NB		 2670 u8 asc = 0, ascq = 0;
2671
a1d8b49a 2672 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2673 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2674 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2675 return 0;
2676 }
2677 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2678 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2679
2680 if (!reason && from_transport)
2681 goto after_reason;
2682
2683 if (!from_transport)
2684 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
9c58b7dd 2685
c66ac9db
NB		 2686 /*
2687 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2688 * SENSE KEY values from include/scsi/scsi.h
2689 */
2690 switch (reason) {
ba829137
HR		 2691 case TCM_NO_SENSE:
2692 /* CURRENT ERROR */
2693 buffer[0] = 0x70;
2694 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2695 /* Not Ready */
2696 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2697 /* NO ADDITIONAL SENSE INFORMATION */
2698 buffer[SPC_ASC_KEY_OFFSET] = 0;
2699 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2700 break;
c66ac9db 2701 case TCM_NON_EXISTENT_LUN:
eb39d340 2702 /* CURRENT ERROR */
9c58b7dd
RD		 2703 buffer[0] = 0x70;
2704 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340 2705 /* ILLEGAL REQUEST */
9c58b7dd 2706 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
eb39d340 2707 /* LOGICAL UNIT NOT SUPPORTED */
9c58b7dd 2708 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
eb39d340 2709 break;
c66ac9db
NB		 2710 case TCM_UNSUPPORTED_SCSI_OPCODE:
2711 case TCM_SECTOR_COUNT_TOO_MANY:
2712 /* CURRENT ERROR */
9c58b7dd
RD		 2713 buffer[0] = 0x70;
2714 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2715 /* ILLEGAL REQUEST */
9c58b7dd 2716 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2717 /* INVALID COMMAND OPERATION CODE */
9c58b7dd 2718 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
c66ac9db
NB		 2719 break;
2720 case TCM_UNKNOWN_MODE_PAGE:
2721 /* CURRENT ERROR */
9c58b7dd
RD		 2722 buffer[0] = 0x70;
2723 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2724 /* ILLEGAL REQUEST */
9c58b7dd 2725 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2726 /* INVALID FIELD IN CDB */
9c58b7dd 2727 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2728 break;
2729 case TCM_CHECK_CONDITION_ABORT_CMD:
2730 /* CURRENT ERROR */
9c58b7dd
RD		 2731 buffer[0] = 0x70;
2732 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2733 /* ABORTED COMMAND */
9c58b7dd 2734 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2735 /* BUS DEVICE RESET FUNCTION OCCURRED */
9c58b7dd
RD		 2736 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2737 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
c66ac9db
NB		 2738 break;
2739 case TCM_INCORRECT_AMOUNT_OF_DATA:
2740 /* CURRENT ERROR */
9c58b7dd
RD		 2741 buffer[0] = 0x70;
2742 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2743 /* ABORTED COMMAND */
9c58b7dd 2744 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2745 /* WRITE ERROR */
9c58b7dd 2746 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2747 /* NOT ENOUGH UNSOLICITED DATA */
9c58b7dd 2748 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
c66ac9db
NB		 2749 break;
2750 case TCM_INVALID_CDB_FIELD:
2751 /* CURRENT ERROR */
9c58b7dd
RD		 2752 buffer[0] = 0x70;
2753 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2754 /* ILLEGAL REQUEST */
9c58b7dd 2755 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2756 /* INVALID FIELD IN CDB */
9c58b7dd 2757 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2758 break;
2759 case TCM_INVALID_PARAMETER_LIST:
2760 /* CURRENT ERROR */
9c58b7dd
RD		 2761 buffer[0] = 0x70;
2762 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2763 /* ILLEGAL REQUEST */
9c58b7dd 2764 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2765 /* INVALID FIELD IN PARAMETER LIST */
9c58b7dd 2766 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
c66ac9db 2767 break;
bb992e72
RD		 2768 case TCM_PARAMETER_LIST_LENGTH_ERROR:
2769 /* CURRENT ERROR */
2770 buffer[0] = 0x70;
2771 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2772 /* ILLEGAL REQUEST */
2773 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2774 /* PARAMETER LIST LENGTH ERROR */
2775 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2776 break;
c66ac9db
NB		 2777 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2778 /* CURRENT ERROR */
9c58b7dd
RD		 2779 buffer[0] = 0x70;
2780 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2781 /* ABORTED COMMAND */
9c58b7dd 2782 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2783 /* WRITE ERROR */
9c58b7dd 2784 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2785 /* UNEXPECTED_UNSOLICITED_DATA */
9c58b7dd 2786 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
c66ac9db
NB		 2787 break;
2788 case TCM_SERVICE_CRC_ERROR:
2789 /* CURRENT ERROR */
9c58b7dd
RD		 2790 buffer[0] = 0x70;
2791 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2792 /* ABORTED COMMAND */
9c58b7dd 2793 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2794 /* PROTOCOL SERVICE CRC ERROR */
9c58b7dd 2795 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
c66ac9db 2796 /* N/A */
9c58b7dd 2797 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
c66ac9db
NB		 2798 break;
2799 case TCM_SNACK_REJECTED:
2800 /* CURRENT ERROR */
9c58b7dd
RD		 2801 buffer[0] = 0x70;
2802 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2803 /* ABORTED COMMAND */
9c58b7dd 2804 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2805 /* READ ERROR */
9c58b7dd 2806 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
c66ac9db 2807 /* FAILED RETRANSMISSION REQUEST */
9c58b7dd 2808 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
c66ac9db
NB		 2809 break;
2810 case TCM_WRITE_PROTECTED:
2811 /* CURRENT ERROR */
9c58b7dd
RD		 2812 buffer[0] = 0x70;
2813 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2814 /* DATA PROTECT */
9c58b7dd 2815 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
c66ac9db 2816 /* WRITE PROTECTED */
9c58b7dd 2817 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
c66ac9db 2818 break;
e2397c70
RD		 2819 case TCM_ADDRESS_OUT_OF_RANGE:
2820 /* CURRENT ERROR */
9c58b7dd
RD		 2821 buffer[0] = 0x70;
2822 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
e2397c70 2823 /* ILLEGAL REQUEST */
9c58b7dd 2824 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
e2397c70 2825 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
9c58b7dd 2826 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
e2397c70 2827 break;
c66ac9db
NB		 2828 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2829 /* CURRENT ERROR */
9c58b7dd
RD		 2830 buffer[0] = 0x70;
2831 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2832 /* UNIT ATTENTION */
9c58b7dd 2833 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
c66ac9db 2834 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
9c58b7dd
RD		 2835 buffer[SPC_ASC_KEY_OFFSET] = asc;
2836 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2837 break;
2838 case TCM_CHECK_CONDITION_NOT_READY:
2839 /* CURRENT ERROR */
9c58b7dd
RD		 2840 buffer[0] = 0x70;
2841 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2842 /* Not Ready */
9c58b7dd 2843 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2844 transport_get_sense_codes(cmd, &asc, &ascq);
9c58b7dd
RD		 2845 buffer[SPC_ASC_KEY_OFFSET] = asc;
2846 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db 2847 break;
818b571c
NB		 2848 case TCM_MISCOMPARE_VERIFY:
2849 /* CURRENT ERROR */
2850 buffer[0] = 0x70;
2851 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2852 buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE;
2853 /* MISCOMPARE DURING VERIFY OPERATION */
2854 buffer[SPC_ASC_KEY_OFFSET] = 0x1d;
2855 buffer[SPC_ASCQ_KEY_OFFSET] = 0x00;
2856 break;
c66ac9db
NB		 2857 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2858 default:
2859 /* CURRENT ERROR */
9c58b7dd
RD		 2860 buffer[0] = 0x70;
2861 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
ad673282
JE		 2862 /*
2863 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2864 * Solaris initiators. Returning NOT READY instead means the
2865 * operations will be retried a finite number of times and we
2866 * can survive intermittent errors.
2867 */
2868 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2869 /* LOGICAL UNIT COMMUNICATION FAILURE */
18a9df42 2870 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
c66ac9db
NB		 2871 break;
2872 }
2873 /*
2874 * This code uses linux/include/scsi/scsi.h SAM status codes!
2875 */
2876 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2877 /*
2878 * Automatically padded, this value is encoded in the fabric's
2879 * data_length response PDU containing the SCSI defined sense data.
2880 */
9c58b7dd 2881 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
c66ac9db
NB		 2882
2883after_reason:
e5c0d6ad 2884 trace_target_cmd_complete(cmd);
07bde79a 2885 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2886}
2887EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2888
2889int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2890{
c18bc7d8
RD		 2891 if (!(cmd->transport_state & CMD_T_ABORTED))
2892 return 0;
c66ac9db 2893
c18bc7d8
RD		 2894 if (!send_status || (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
2895 return 1;
8b1e1244 2896
c18bc7d8
RD		 2897 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2898 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2899
c18bc7d8 2900 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e5c0d6ad 2901 trace_target_cmd_complete(cmd);
c18bc7d8
RD		 2902 cmd->se_tfo->queue_status(cmd);
2903
2904 return 1;
c66ac9db
NB		 2905}
2906EXPORT_SYMBOL(transport_check_aborted_status);
2907
2908void transport_send_task_abort(struct se_cmd *cmd)
2909{
c252f003
NB		 2910 unsigned long flags;
2911
2912 spin_lock_irqsave(&cmd->t_state_lock, flags);
3ea160b3 2913 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION | SCF_SENT_DELAYED_TAS)) {
c252f003
NB		 2914 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2915 return;
2916 }
2917 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2918
c66ac9db
NB		 2919 /*
2920 * If there are still expected incoming fabric WRITEs, we wait
2921 * until until they have completed before sending a TASK_ABORTED
2922 * response. This response with TASK_ABORTED status will be
2923 * queued back to fabric module by transport_check_aborted_status().
2924 */
2925 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2926 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 2927 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 2928 smp_mb__after_atomic_inc();
c66ac9db
NB		 2929 }
2930 }
2931 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 2932
72b59d6e
RD		 2933 transport_lun_remove_cmd(cmd);
2934
6708bb27 2935 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 2936 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 2937 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2938
e5c0d6ad 2939 trace_target_cmd_complete(cmd);
e3d6f909 2940 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2941}
2942
af877292 2943static void target_tmr_work(struct work_struct *work)
c66ac9db 2944{
af877292 2945 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 2946 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2947 struct se_tmr_req *tmr = cmd->se_tmr_req;
2948 int ret;
2949
2950 switch (tmr->function) {
5c6cd613 2951 case TMR_ABORT_TASK:
3d28934a 2952 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 2953 break;
5c6cd613
NB		 2954 case TMR_ABORT_TASK_SET:
2955 case TMR_CLEAR_ACA:
2956 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 2957 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2958 break;
5c6cd613 2959 case TMR_LUN_RESET:
c66ac9db
NB		 2960 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2961 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2962 TMR_FUNCTION_REJECTED;
2963 break;
5c6cd613 2964 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 2965 tmr->response = TMR_FUNCTION_REJECTED;
2966 break;
5c6cd613 2967 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 2968 tmr->response = TMR_FUNCTION_REJECTED;
2969 break;
c66ac9db 2970 default:
6708bb27 2971 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 2972 tmr->function);
2973 tmr->response = TMR_FUNCTION_REJECTED;
2974 break;
2975 }
2976
2977 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 2978 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 2979
b7b8bef7 2980 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 2981}
2982
af877292
CH		 2983int transport_generic_handle_tmr(
2984 struct se_cmd *cmd)
c66ac9db 2985{
af877292
CH		 2986 INIT_WORK(&cmd->work, target_tmr_work);
2987 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 2988 return 0;
2989}
af877292 2990EXPORT_SYMBOL(transport_generic_handle_tmr);
Linux kernel - Deliverables
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