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target: Add compare_and_write_post() completion callback fall through
[linux-2.6-block.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
fd9a11d7 6 * (c) Copyright 2002-2012 RisingTide Systems LLC.
c66ac9db
NB		 7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
c66ac9db
NB		 26#include <linux/net.h>
27#include <linux/delay.h>
28#include <linux/string.h>
29#include <linux/timer.h>
30#include <linux/slab.h>
31#include <linux/blkdev.h>
32#include <linux/spinlock.h>
c66ac9db
NB		 33#include <linux/kthread.h>
34#include <linux/in.h>
35#include <linux/cdrom.h>
827509e3 36#include <linux/module.h>
015487b8 37#include <linux/ratelimit.h>
c66ac9db
NB		 38#include <asm/unaligned.h>
39#include <net/sock.h>
40#include <net/tcp.h>
41#include <scsi/scsi.h>
42#include <scsi/scsi_cmnd.h>
e66ecd50 43#include <scsi/scsi_tcq.h>
c66ac9db
NB		 44
45#include <target/target_core_base.h>
c4795fb2
CH		 46#include <target/target_core_backend.h>
47#include <target/target_core_fabric.h>
c66ac9db
NB		 48#include <target/target_core_configfs.h>
49
e26d99ae 50#include "target_core_internal.h"
c66ac9db 51#include "target_core_alua.h"
c66ac9db 52#include "target_core_pr.h"
c66ac9db
NB		 53#include "target_core_ua.h"
54
e5c0d6ad
RD		 55#define CREATE_TRACE_POINTS
56#include <trace/events/target.h>
57
35e0e757 58static struct workqueue_struct *target_completion_wq;
c66ac9db 59static struct kmem_cache *se_sess_cache;
c66ac9db 60struct kmem_cache *se_ua_cache;
c66ac9db
NB		 61struct kmem_cache *t10_pr_reg_cache;
62struct kmem_cache *t10_alua_lu_gp_cache;
63struct kmem_cache *t10_alua_lu_gp_mem_cache;
64struct kmem_cache *t10_alua_tg_pt_gp_cache;
65struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
66
c66ac9db 67static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 68static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 69 struct se_device *dev);
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
NB		 578 unsigned long flags;
579
580 if (!lun)
581 return;
582
c66ac9db 583 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
3d26fea0
CH		 584 if (!list_empty(&cmd->se_lun_node))
585 list_del_init(&cmd->se_lun_node);
c66ac9db
NB		 586 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
587}
588
589void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
590{
c66ac9db
NB		 591 if (transport_cmd_check_stop_to_fabric(cmd))
592 return;
af877292 593 if (remove)
e6a2573f 594 transport_put_cmd(cmd);
c66ac9db
NB		 595}
596
35e0e757
CH		 597static void target_complete_failure_work(struct work_struct *work)
598{
599 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
600
de103c93
CH		 601 transport_generic_request_failure(cmd,
602 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 603}
604
6138ed2a 605/*
d5829eac
PB		 606 * Used when asking transport to copy Sense Data from the underlying
607 * Linux/SCSI struct scsi_cmnd
6138ed2a 608 */
d5829eac 609static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 610{
6138ed2a 611 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 612
613 WARN_ON(!cmd->se_lun);
614
615 if (!dev)
d5829eac 616 return NULL;
6138ed2a 617
d5829eac
PB		 618 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
619 return NULL;
6138ed2a 620
9c58b7dd 621 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 622
d5829eac 623 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 624 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 625 return cmd->sense_buffer;
6138ed2a
PB		 626}
627
5787cacd 628void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 629{
42bf829e 630 struct se_device *dev = cmd->se_dev;
5787cacd 631 int success = scsi_status == GOOD;
c66ac9db 632 unsigned long flags;
c66ac9db 633
5787cacd
CH		 634 cmd->scsi_status = scsi_status;
635
636
a1d8b49a 637 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 638 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 639
c66ac9db 640 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 641 dev->transport->transport_complete(cmd,
642 cmd->t_data_sg,
643 transport_get_sense_buffer(cmd));
644 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 645 success = 1;
c66ac9db
NB		 646 }
647
648 /*
5787cacd 649 * See if we are waiting to complete for an exception condition.
c66ac9db 650 */
cf572a96 651 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 652 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 653 complete(&cmd->task_stop_comp);
c66ac9db
NB		 654 return;
655 }
2235007c
CH		 656
657 if (!success)
7d680f3b 658 cmd->transport_state |= CMD_T_FAILED;
2235007c 659
3d28934a
NB		 660 /*
661 * Check for case where an explict ABORT_TASK has been received
662 * and transport_wait_for_tasks() will be waiting for completion..
663 */
664 if (cmd->transport_state & CMD_T_ABORTED &&
665 cmd->transport_state & CMD_T_STOP) {
666 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
667 complete(&cmd->t_transport_stop_comp);
668 return;
669 } else if (cmd->transport_state & CMD_T_FAILED) {
35e0e757 670 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 671 } else {
35e0e757 672 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 673 }
35e0e757 674
35e0e757 675 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 676 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 677 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 678
35e0e757 679 queue_work(target_completion_wq, &cmd->work);
c66ac9db 680}
6bb35e00
CH		 681EXPORT_SYMBOL(target_complete_cmd);
682
cf572a96 683static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 684{
cf572a96
CH		 685 struct se_device *dev = cmd->se_dev;
686 unsigned long flags;
c66ac9db 687
cf572a96
CH		 688 spin_lock_irqsave(&dev->execute_task_lock, flags);
689 if (!cmd->state_active) {
690 list_add_tail(&cmd->state_list, &dev->state_list);
691 cmd->state_active = true;
c66ac9db 692 }
cf572a96 693 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 694}
695
07bde79a 696/*
f147abb4 697 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 698 */
7a6f0a1e
CH		 699static void transport_write_pending_qf(struct se_cmd *cmd);
700static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 701
0fd97ccf 702void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 703{
704 struct se_device *dev = container_of(work, struct se_device,
705 qf_work_queue);
bcac364a 706 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 707 struct se_cmd *cmd, *cmd_tmp;
708
709 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 710 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
711 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 712
bcac364a 713 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 714 list_del(&cmd->se_qf_node);
715 atomic_dec(&dev->dev_qf_count);
716 smp_mb__after_atomic_dec();
07bde79a 717
6708bb27 718 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 719 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 720 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 721 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
722 : "UNKNOWN");
f7a5cc0b 723
7a6f0a1e
CH		 724 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
725 transport_write_pending_qf(cmd);
726 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
727 transport_complete_qf(cmd);
07bde79a 728 }
07bde79a
NB		 729}
730
c66ac9db
NB		 731unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
732{
733 switch (cmd->data_direction) {
734 case DMA_NONE:
735 return "NONE";
736 case DMA_FROM_DEVICE:
737 return "READ";
738 case DMA_TO_DEVICE:
739 return "WRITE";
740 case DMA_BIDIRECTIONAL:
741 return "BIDI";
742 default:
743 break;
744 }
745
746 return "UNKNOWN";
747}
748
749void transport_dump_dev_state(
750 struct se_device *dev,
751 char *b,
752 int *bl)
753{
754 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 755 if (dev->export_count)
c66ac9db 756 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 757 else
c66ac9db 758 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 759
5f41a31d 760 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 761 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 762 dev->dev_attrib.block_size,
763 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 764 *bl += sprintf(b + *bl, " ");
765}
766
c66ac9db
NB		 767void transport_dump_vpd_proto_id(
768 struct t10_vpd *vpd,
769 unsigned char *p_buf,
770 int p_buf_len)
771{
772 unsigned char buf[VPD_TMP_BUF_SIZE];
773 int len;
774
775 memset(buf, 0, VPD_TMP_BUF_SIZE);
776 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
777
778 switch (vpd->protocol_identifier) {
779 case 0x00:
780 sprintf(buf+len, "Fibre Channel\n");
781 break;
782 case 0x10:
783 sprintf(buf+len, "Parallel SCSI\n");
784 break;
785 case 0x20:
786 sprintf(buf+len, "SSA\n");
787 break;
788 case 0x30:
789 sprintf(buf+len, "IEEE 1394\n");
790 break;
791 case 0x40:
792 sprintf(buf+len, "SCSI Remote Direct Memory Access"
793 " Protocol\n");
794 break;
795 case 0x50:
796 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
797 break;
798 case 0x60:
799 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
800 break;
801 case 0x70:
802 sprintf(buf+len, "Automation/Drive Interface Transport"
803 " Protocol\n");
804 break;
805 case 0x80:
806 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
807 break;
808 default:
809 sprintf(buf+len, "Unknown 0x%02x\n",
810 vpd->protocol_identifier);
811 break;
812 }
813
814 if (p_buf)
815 strncpy(p_buf, buf, p_buf_len);
816 else
6708bb27 817 pr_debug("%s", buf);
c66ac9db
NB		 818}
819
820void
821transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
822{
823 /*
824 * Check if the Protocol Identifier Valid (PIV) bit is set..
825 *
826 * from spc3r23.pdf section 7.5.1
827 */
828 if (page_83[1] & 0x80) {
829 vpd->protocol_identifier = (page_83[0] & 0xf0);
830 vpd->protocol_identifier_set = 1;
831 transport_dump_vpd_proto_id(vpd, NULL, 0);
832 }
833}
834EXPORT_SYMBOL(transport_set_vpd_proto_id);
835
836int transport_dump_vpd_assoc(
837 struct t10_vpd *vpd,
838 unsigned char *p_buf,
839 int p_buf_len)
840{
841 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 842 int ret = 0;
843 int len;
c66ac9db
NB		 844
845 memset(buf, 0, VPD_TMP_BUF_SIZE);
846 len = sprintf(buf, "T10 VPD Identifier Association: ");
847
848 switch (vpd->association) {
849 case 0x00:
850 sprintf(buf+len, "addressed logical unit\n");
851 break;
852 case 0x10:
853 sprintf(buf+len, "target port\n");
854 break;
855 case 0x20:
856 sprintf(buf+len, "SCSI target device\n");
857 break;
858 default:
859 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 860 ret = -EINVAL;
c66ac9db
NB		 861 break;
862 }
863
864 if (p_buf)
865 strncpy(p_buf, buf, p_buf_len);
866 else
6708bb27 867 pr_debug("%s", buf);
c66ac9db
NB		 868
869 return ret;
870}
871
872int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
873{
874 /*
875 * The VPD identification association..
876 *
877 * from spc3r23.pdf Section 7.6.3.1 Table 297
878 */
879 vpd->association = (page_83[1] & 0x30);
880 return transport_dump_vpd_assoc(vpd, NULL, 0);
881}
882EXPORT_SYMBOL(transport_set_vpd_assoc);
883
884int transport_dump_vpd_ident_type(
885 struct t10_vpd *vpd,
886 unsigned char *p_buf,
887 int p_buf_len)
888{
889 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 890 int ret = 0;
891 int len;
c66ac9db
NB		 892
893 memset(buf, 0, VPD_TMP_BUF_SIZE);
894 len = sprintf(buf, "T10 VPD Identifier Type: ");
895
896 switch (vpd->device_identifier_type) {
897 case 0x00:
898 sprintf(buf+len, "Vendor specific\n");
899 break;
900 case 0x01:
901 sprintf(buf+len, "T10 Vendor ID based\n");
902 break;
903 case 0x02:
904 sprintf(buf+len, "EUI-64 based\n");
905 break;
906 case 0x03:
907 sprintf(buf+len, "NAA\n");
908 break;
909 case 0x04:
910 sprintf(buf+len, "Relative target port identifier\n");
911 break;
912 case 0x08:
913 sprintf(buf+len, "SCSI name string\n");
914 break;
915 default:
916 sprintf(buf+len, "Unsupported: 0x%02x\n",
917 vpd->device_identifier_type);
e3d6f909 918 ret = -EINVAL;
c66ac9db
NB		 919 break;
920 }
921
e3d6f909
AG		 922 if (p_buf) {
923 if (p_buf_len < strlen(buf)+1)
924 return -EINVAL;
c66ac9db 925 strncpy(p_buf, buf, p_buf_len);
e3d6f909 926 } else {
6708bb27 927 pr_debug("%s", buf);
e3d6f909 928 }
c66ac9db
NB		 929
930 return ret;
931}
932
933int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
934{
935 /*
936 * The VPD identifier type..
937 *
938 * from spc3r23.pdf Section 7.6.3.1 Table 298
939 */
940 vpd->device_identifier_type = (page_83[1] & 0x0f);
941 return transport_dump_vpd_ident_type(vpd, NULL, 0);
942}
943EXPORT_SYMBOL(transport_set_vpd_ident_type);
944
945int transport_dump_vpd_ident(
946 struct t10_vpd *vpd,
947 unsigned char *p_buf,
948 int p_buf_len)
949{
950 unsigned char buf[VPD_TMP_BUF_SIZE];
951 int ret = 0;
952
953 memset(buf, 0, VPD_TMP_BUF_SIZE);
954
955 switch (vpd->device_identifier_code_set) {
956 case 0x01: /* Binary */
703d641d
DC		 957 snprintf(buf, sizeof(buf),
958 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 959 &vpd->device_identifier[0]);
960 break;
961 case 0x02: /* ASCII */
703d641d
DC		 962 snprintf(buf, sizeof(buf),
963 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 964 &vpd->device_identifier[0]);
965 break;
966 case 0x03: /* UTF-8 */
703d641d
DC		 967 snprintf(buf, sizeof(buf),
968 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 969 &vpd->device_identifier[0]);
970 break;
971 default:
972 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
973 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 974 ret = -EINVAL;
c66ac9db
NB		 975 break;
976 }
977
978 if (p_buf)
979 strncpy(p_buf, buf, p_buf_len);
980 else
6708bb27 981 pr_debug("%s", buf);
c66ac9db
NB		 982
983 return ret;
984}
985
986int
987transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
988{
989 static const char hex_str[] = "0123456789abcdef";
35d1efe8 990 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 991
992 /*
993 * The VPD Code Set (encoding)
994 *
995 * from spc3r23.pdf Section 7.6.3.1 Table 296
996 */
997 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
998 switch (vpd->device_identifier_code_set) {
999 case 0x01: /* Binary */
1000 vpd->device_identifier[j++] =
1001 hex_str[vpd->device_identifier_type];
1002 while (i < (4 + page_83[3])) {
1003 vpd->device_identifier[j++] =
1004 hex_str[(page_83[i] & 0xf0) >> 4];
1005 vpd->device_identifier[j++] =
1006 hex_str[page_83[i] & 0x0f];
1007 i++;
1008 }
1009 break;
1010 case 0x02: /* ASCII */
1011 case 0x03: /* UTF-8 */
1012 while (i < (4 + page_83[3]))
1013 vpd->device_identifier[j++] = page_83[i++];
1014 break;
1015 default:
1016 break;
1017 }
1018
1019 return transport_dump_vpd_ident(vpd, NULL, 0);
1020}
1021EXPORT_SYMBOL(transport_set_vpd_ident);
1022
de103c93
CH		 1023sense_reason_t
1024target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1025{
1026 struct se_device *dev = cmd->se_dev;
1027
1028 if (cmd->unknown_data_length) {
1029 cmd->data_length = size;
1030 } else if (size != cmd->data_length) {
1031 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1032 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1033 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1034 cmd->data_length, size, cmd->t_task_cdb[0]);
1035
9b3b8041
CH		 1036 if (cmd->data_direction == DMA_TO_DEVICE) {
1037 pr_err("Rejecting underflow/overflow"
1038 " WRITE data\n");
de103c93 1039 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 1040 }
1041 /*
1042 * Reject READ_* or WRITE_* with overflow/underflow for
1043 * type SCF_SCSI_DATA_CDB.
1044 */
0fd97ccf 1045 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1046 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1047 " CDB on non 512-byte sector setup subsystem"
1048 " plugin: %s\n", dev->transport->name);
1049 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1050 return TCM_INVALID_CDB_FIELD;
9b3b8041 1051 }
4c054ba6
NB		 1052 /*
1053 * For the overflow case keep the existing fabric provided
1054 * ->data_length. Otherwise for the underflow case, reset
1055 * ->data_length to the smaller SCSI expected data transfer
1056 * length.
1057 */
9b3b8041
CH		 1058 if (size > cmd->data_length) {
1059 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1060 cmd->residual_count = (size - cmd->data_length);
1061 } else {
1062 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1063 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1064 cmd->data_length = size;
9b3b8041 1065 }
9b3b8041
CH		 1066 }
1067
1068 return 0;
1069
9b3b8041
CH		 1070}
1071
c66ac9db
NB		 1072/*
1073 * Used by fabric modules containing a local struct se_cmd within their
1074 * fabric dependent per I/O descriptor.
1075 */
1076void transport_init_se_cmd(
1077 struct se_cmd *cmd,
1078 struct target_core_fabric_ops *tfo,
1079 struct se_session *se_sess,
1080 u32 data_length,
1081 int data_direction,
1082 int task_attr,
1083 unsigned char *sense_buffer)
1084{
5951146d
AG		 1085 INIT_LIST_HEAD(&cmd->se_lun_node);
1086 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1087 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1088 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1089 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a
AG		 1090 init_completion(&cmd->transport_lun_fe_stop_comp);
1091 init_completion(&cmd->transport_lun_stop_comp);
1092 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1093 init_completion(&cmd->cmd_wait_comp);
cf572a96 1094 init_completion(&cmd->task_stop_comp);
a1d8b49a 1095 spin_lock_init(&cmd->t_state_lock);
7d680f3b 1096 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1097
1098 cmd->se_tfo = tfo;
1099 cmd->se_sess = se_sess;
1100 cmd->data_length = data_length;
1101 cmd->data_direction = data_direction;
1102 cmd->sam_task_attr = task_attr;
1103 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1104
1105 cmd->state_active = false;
c66ac9db
NB		 1106}
1107EXPORT_SYMBOL(transport_init_se_cmd);
1108
de103c93
CH		 1109static sense_reason_t
1110transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1111{
019c4ca6
CH		 1112 struct se_device *dev = cmd->se_dev;
1113
c66ac9db
NB		 1114 /*
1115 * Check if SAM Task Attribute emulation is enabled for this
1116 * struct se_device storage object
1117 */
019c4ca6 1118 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 1119 return 0;
1120
e66ecd50 1121 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1122 pr_debug("SAM Task Attribute ACA"
c66ac9db 1123 " emulation is not supported\n");
de103c93 1124 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1125 }
1126 /*
1127 * Used to determine when ORDERED commands should go from
1128 * Dormant to Active status.
1129 */
019c4ca6 1130 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
c66ac9db 1131 smp_mb__after_atomic_inc();
6708bb27 1132 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1133 cmd->se_ordered_id, cmd->sam_task_attr,
019c4ca6 1134 dev->transport->name);
c66ac9db
NB		 1135 return 0;
1136}
1137
de103c93
CH		 1138sense_reason_t
1139target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1140{
0fd97ccf 1141 struct se_device *dev = cmd->se_dev;
de103c93 1142 sense_reason_t ret;
c66ac9db 1143
c66ac9db
NB		 1144 /*
1145 * Ensure that the received CDB is less than the max (252 + 8) bytes
1146 * for VARIABLE_LENGTH_CMD
1147 */
1148 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1149 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1150 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1151 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1152 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1153 }
1154 /*
1155 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1156 * allocate the additional extended CDB buffer now.. Otherwise
1157 * setup the pointer from __t_task_cdb to t_task_cdb.
1158 */
a1d8b49a
AG		 1159 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1160 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1161 GFP_KERNEL);
6708bb27
AG		 1162 if (!cmd->t_task_cdb) {
1163 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1164 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1165 scsi_command_size(cdb),
a1d8b49a 1166 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1167 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1168 }
1169 } else
a1d8b49a 1170 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1171 /*
a1d8b49a 1172 * Copy the original CDB into cmd->
c66ac9db 1173 */
a1d8b49a 1174 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1175
e5c0d6ad
RD		 1176 trace_target_sequencer_start(cmd);
1177
cb4f4d3c
CH		 1178 /*
1179 * Check for an existing UNIT ATTENTION condition
1180 */
de103c93
CH		 1181 ret = target_scsi3_ua_check(cmd);
1182 if (ret)
1183 return ret;
cb4f4d3c 1184
c87fbd56 1185 ret = target_alua_state_check(cmd);
de103c93
CH		 1186 if (ret)
1187 return ret;
cb4f4d3c 1188
d977f437 1189 ret = target_check_reservation(cmd);
f85eda8d
NB		 1190 if (ret) {
1191 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
d977f437 1192 return ret;
f85eda8d 1193 }
cb4f4d3c 1194
0fd97ccf 1195 ret = dev->transport->parse_cdb(cmd);
de103c93
CH		 1196 if (ret)
1197 return ret;
1198
1199 ret = transport_check_alloc_task_attr(cmd);
1200 if (ret)
c66ac9db 1201 return ret;
cb4f4d3c 1202
cb4f4d3c 1203 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
cb4f4d3c 1204
c66ac9db
NB		 1205 spin_lock(&cmd->se_lun->lun_sep_lock);
1206 if (cmd->se_lun->lun_sep)
1207 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1208 spin_unlock(&cmd->se_lun->lun_sep_lock);
1209 return 0;
1210}
a12f41f8 1211EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1212
695434e1
NB		 1213/*
1214 * Used by fabric module frontends to queue tasks directly.
1215 * Many only be used from process context only
1216 */
1217int transport_handle_cdb_direct(
1218 struct se_cmd *cmd)
1219{
de103c93 1220 sense_reason_t ret;
dd8ae59d 1221
695434e1
NB		 1222 if (!cmd->se_lun) {
1223 dump_stack();
6708bb27 1224 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1225 return -EINVAL;
1226 }
1227 if (in_interrupt()) {
1228 dump_stack();
6708bb27 1229 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1230 " from interrupt context\n");
1231 return -EINVAL;
1232 }
dd8ae59d 1233 /*
af877292
CH		 1234 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1235 * outstanding descriptors are handled correctly during shutdown via
1236 * transport_wait_for_tasks()
dd8ae59d
NB		 1237 *
1238 * Also, we don't take cmd->t_state_lock here as we only expect
1239 * this to be called for initial descriptor submission.
1240 */
1241 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1242 cmd->transport_state |= CMD_T_ACTIVE;
1243
dd8ae59d
NB		 1244 /*
1245 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1246 * so follow TRANSPORT_NEW_CMD processing thread context usage
1247 * and call transport_generic_request_failure() if necessary..
1248 */
1249 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1250 if (ret)
1251 transport_generic_request_failure(cmd, ret);
dd8ae59d 1252 return 0;
695434e1
NB		 1253}
1254EXPORT_SYMBOL(transport_handle_cdb_direct);
1255
de103c93
CH		 1256static sense_reason_t
1257transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1258 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1259{
1260 if (!sgl || !sgl_count)
1261 return 0;
1262
1263 /*
1264 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1265 * scatterlists already have been set to follow what the fabric
1266 * passes for the original expected data transfer length.
1267 */
1268 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1269 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1270 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1271 return TCM_INVALID_CDB_FIELD;
1272 }
1273
1274 cmd->t_data_sg = sgl;
1275 cmd->t_data_nents = sgl_count;
1276
1277 if (sgl_bidi && sgl_bidi_count) {
1278 cmd->t_bidi_data_sg = sgl_bidi;
1279 cmd->t_bidi_data_nents = sgl_bidi_count;
1280 }
1281 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1282 return 0;
1283}
1284
a026757f
NB		 1285/*
1286 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1287 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1288 *
1289 * @se_cmd: command descriptor to submit
1290 * @se_sess: associated se_sess for endpoint
1291 * @cdb: pointer to SCSI CDB
1292 * @sense: pointer to SCSI sense buffer
1293 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1294 * @data_length: fabric expected data transfer length
1295 * @task_addr: SAM task attribute
1296 * @data_dir: DMA data direction
1297 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1298 * @sgl: struct scatterlist memory for unidirectional mapping
1299 * @sgl_count: scatterlist count for unidirectional mapping
1300 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1301 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
a6360785 1302 *
d6dfc868
RD		 1303 * Returns non zero to signal active I/O shutdown failure. All other
1304 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1305 * but still return zero here.
1306 *
a6360785
NB		 1307 * This may only be called from process context, and also currently
1308 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1309 */
1310int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785 1311 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
a026757f
NB		 1312 u32 data_length, int task_attr, int data_dir, int flags,
1313 struct scatterlist *sgl, u32 sgl_count,
1314 struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
a6360785
NB		 1315{
1316 struct se_portal_group *se_tpg;
de103c93
CH		 1317 sense_reason_t rc;
1318 int ret;
a6360785
NB		 1319
1320 se_tpg = se_sess->se_tpg;
1321 BUG_ON(!se_tpg);
1322 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1323 BUG_ON(in_interrupt());
1324 /*
1325 * Initialize se_cmd for target operation. From this point
1326 * exceptions are handled by sending exception status via
1327 * target_core_fabric_ops->queue_status() callback
1328 */
1329 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1330 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1331 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1332 se_cmd->unknown_data_length = 1;
a6360785
NB		 1333 /*
1334 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1335 * se_sess->sess_cmd_list. A second kref_get here is necessary
1336 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1337 * kref_put() to happen during fabric packet acknowledgement.
1338 */
de103c93
CH		 1339 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1340 if (ret)
1341 return ret;
a6360785
NB		 1342 /*
1343 * Signal bidirectional data payloads to target-core
1344 */
1345 if (flags & TARGET_SCF_BIDI_OP)
1346 se_cmd->se_cmd_flags |= SCF_BIDI;
1347 /*
1348 * Locate se_lun pointer and attach it to struct se_cmd
1349 */
de103c93
CH		 1350 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1351 if (rc) {
1352 transport_send_check_condition_and_sense(se_cmd, rc, 0);
735703ca 1353 target_put_sess_cmd(se_sess, se_cmd);
d6dfc868 1354 return 0;
735703ca 1355 }
d6e0175c 1356
a12f41f8 1357 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
735703ca 1358 if (rc != 0) {
de103c93 1359 transport_generic_request_failure(se_cmd, rc);
d6dfc868 1360 return 0;
735703ca 1361 }
a026757f
NB		 1362 /*
1363 * When a non zero sgl_count has been passed perform SGL passthrough
1364 * mapping for pre-allocated fabric memory instead of having target
1365 * core perform an internal SGL allocation..
1366 */
1367 if (sgl_count != 0) {
1368 BUG_ON(!sgl);
1369
944981c7
NB		 1370 /*
1371 * A work-around for tcm_loop as some userspace code via
1372 * scsi-generic do not memset their associated read buffers,
1373 * so go ahead and do that here for type non-data CDBs. Also
1374 * note that this is currently guaranteed to be a single SGL
1375 * for this case by target core in target_setup_cmd_from_cdb()
1376 * -> transport_generic_cmd_sequencer().
1377 */
1378 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1379 se_cmd->data_direction == DMA_FROM_DEVICE) {
1380 unsigned char *buf = NULL;
1381
1382 if (sgl)
1383 buf = kmap(sg_page(sgl)) + sgl->offset;
1384
1385 if (buf) {
1386 memset(buf, 0, sgl->length);
1387 kunmap(sg_page(sgl));
1388 }
1389 }
1390
a026757f
NB		 1391 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1392 sgl_bidi, sgl_bidi_count);
1393 if (rc != 0) {
de103c93 1394 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1395 return 0;
1396 }
1397 }
11e319ed
AG		 1398 /*
1399 * Check if we need to delay processing because of ALUA
1400 * Active/NonOptimized primary access state..
1401 */
1402 core_alua_check_nonop_delay(se_cmd);
1403
a6360785 1404 transport_handle_cdb_direct(se_cmd);
d6dfc868 1405 return 0;
a6360785 1406}
a026757f
NB		 1407EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1408
1409/*
1410 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1411 *
1412 * @se_cmd: command descriptor to submit
1413 * @se_sess: associated se_sess for endpoint
1414 * @cdb: pointer to SCSI CDB
1415 * @sense: pointer to SCSI sense buffer
1416 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1417 * @data_length: fabric expected data transfer length
1418 * @task_addr: SAM task attribute
1419 * @data_dir: DMA data direction
1420 * @flags: flags for command submission from target_sc_flags_tables
1421 *
1422 * Returns non zero to signal active I/O shutdown failure. All other
1423 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1424 * but still return zero here.
1425 *
1426 * This may only be called from process context, and also currently
1427 * assumes internal allocation of fabric payload buffer by target-core.
1428 *
1429 * It also assumes interal target core SGL memory allocation.
1430 */
1431int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1432 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1433 u32 data_length, int task_attr, int data_dir, int flags)
1434{
1435 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1436 unpacked_lun, data_length, task_attr, data_dir,
1437 flags, NULL, 0, NULL, 0);
1438}
a6360785
NB		 1439EXPORT_SYMBOL(target_submit_cmd);
1440
9f0d05c2
NB		 1441static void target_complete_tmr_failure(struct work_struct *work)
1442{
1443 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1444
1445 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1446 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1447
1448 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1449}
1450
ea98d7f9
AG		 1451/**
1452 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1453 * for TMR CDBs
1454 *
1455 * @se_cmd: command descriptor to submit
1456 * @se_sess: associated se_sess for endpoint
1457 * @sense: pointer to SCSI sense buffer
1458 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1459 * @fabric_context: fabric context for TMR req
1460 * @tm_type: Type of TM request
c0974f89
NB		 1461 * @gfp: gfp type for caller
1462 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1463 * @flags: submit cmd flags
ea98d7f9
AG		 1464 *
1465 * Callable from all contexts.
1466 **/
1467
c7042cae 1468int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1469 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1470 void *fabric_tmr_ptr, unsigned char tm_type,
1471 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1472{
1473 struct se_portal_group *se_tpg;
1474 int ret;
1475
1476 se_tpg = se_sess->se_tpg;
1477 BUG_ON(!se_tpg);
1478
1479 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1480 0, DMA_NONE, MSG_SIMPLE_TAG, sense);
c7042cae
NB		 1481 /*
1482 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1483 * allocation failure.
1484 */
c0974f89 1485 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1486 if (ret < 0)
1487 return -ENOMEM;
ea98d7f9 1488
c0974f89
NB		 1489 if (tm_type == TMR_ABORT_TASK)
1490 se_cmd->se_tmr_req->ref_task_tag = tag;
1491
ea98d7f9 1492 /* See target_submit_cmd for commentary */
bc187ea6
RD		 1493 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1494 if (ret) {
1495 core_tmr_release_req(se_cmd->se_tmr_req);
1496 return ret;
1497 }
ea98d7f9 1498
ea98d7f9
AG		 1499 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1500 if (ret) {
9f0d05c2
NB		 1501 /*
1502 * For callback during failure handling, push this work off
1503 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1504 */
1505 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1506 schedule_work(&se_cmd->work);
c7042cae 1507 return 0;
ea98d7f9
AG		 1508 }
1509 transport_generic_handle_tmr(se_cmd);
c7042cae 1510 return 0;
ea98d7f9
AG		 1511}
1512EXPORT_SYMBOL(target_submit_tmr);
1513
cdbb70bb 1514/*
cf572a96 1515 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1516 * has completed.
1517 */
cf572a96 1518bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cdbb70bb 1519{
cdbb70bb
CH		 1520 bool was_active = false;
1521
cf572a96
CH		 1522 if (cmd->transport_state & CMD_T_BUSY) {
1523 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1524 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1525
cf572a96
CH		 1526 pr_debug("cmd %p waiting to complete\n", cmd);
1527 wait_for_completion(&cmd->task_stop_comp);
1528 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1529
1530 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1531 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1532 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1533 was_active = true;
1534 }
1535
cdbb70bb
CH		 1536 return was_active;
1537}
1538
c66ac9db
NB		 1539/*
1540 * Handle SAM-esque emulation for generic transport request failures.
1541 */
de103c93
CH		 1542void transport_generic_request_failure(struct se_cmd *cmd,
1543 sense_reason_t sense_reason)
c66ac9db 1544{
07bde79a
NB		 1545 int ret = 0;
1546
6708bb27 1547 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1548 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1549 cmd->t_task_cdb[0]);
de103c93 1550 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1551 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1552 cmd->t_state, sense_reason);
d43d6aea 1553 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1554 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1555 (cmd->transport_state & CMD_T_STOP) != 0,
1556 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1557
c66ac9db
NB		 1558 /*
1559 * For SAM Task Attribute emulation for failed struct se_cmd
1560 */
019c4ca6 1561 transport_complete_task_attr(cmd);
c66ac9db 1562
de103c93 1563 switch (sense_reason) {
03e98c9e
NB		 1564 case TCM_NON_EXISTENT_LUN:
1565 case TCM_UNSUPPORTED_SCSI_OPCODE:
1566 case TCM_INVALID_CDB_FIELD:
1567 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1568 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1569 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1570 case TCM_UNKNOWN_MODE_PAGE:
1571 case TCM_WRITE_PROTECTED:
e2397c70 1572 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1573 case TCM_CHECK_CONDITION_ABORT_CMD:
1574 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1575 case TCM_CHECK_CONDITION_NOT_READY:
c66ac9db 1576 break;
de103c93
CH		 1577 case TCM_OUT_OF_RESOURCES:
1578 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1579 break;
03e98c9e 1580 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1581 /*
1582 * No SENSE Data payload for this case, set SCSI Status
1583 * and queue the response to $FABRIC_MOD.
1584 *
1585 * Uses linux/include/scsi/scsi.h SAM status codes defs
1586 */
1587 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1588 /*
1589 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1590 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1591 * CONFLICT STATUS.
1592 *
1593 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1594 */
e3d6f909 1595 if (cmd->se_sess &&
0fd97ccf 1596 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
e3d6f909 1597 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1598 cmd->orig_fe_lun, 0x2C,
1599 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1600
e5c0d6ad
RD		 1601 trace_target_cmd_complete(cmd);
1602 ret = cmd->se_tfo-> queue_status(cmd);
f147abb4 1603 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1604 goto queue_full;
c66ac9db 1605 goto check_stop;
c66ac9db 1606 default:
6708bb27 1607 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1608 cmd->t_task_cdb[0], sense_reason);
1609 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1610 break;
1611 }
f3146437 1612
de103c93 1613 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1614 if (ret == -EAGAIN || ret == -ENOMEM)
1615 goto queue_full;
07bde79a 1616
c66ac9db
NB		 1617check_stop:
1618 transport_lun_remove_cmd(cmd);
6708bb27 1619 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1620 ;
07bde79a
NB		 1621 return;
1622
1623queue_full:
e057f533
CH		 1624 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1625 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1626}
2fbff127 1627EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1628
76dde50e 1629void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1630{
de103c93 1631 sense_reason_t ret;
5f41a31d 1632
de103c93
CH		 1633 if (cmd->execute_cmd) {
1634 ret = cmd->execute_cmd(cmd);
1635 if (ret) {
1636 spin_lock_irq(&cmd->t_state_lock);
1637 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1638 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1639
de103c93
CH		 1640 transport_generic_request_failure(cmd, ret);
1641 }
5f41a31d
CH		 1642 }
1643}
1644
019c4ca6 1645static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1646{
1647 struct se_device *dev = cmd->se_dev;
1648
019c4ca6
CH		 1649 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1650 return false;
5f41a31d 1651
c66ac9db 1652 /*
25985edc 1653 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1654 * to allow the passed struct se_cmd list of tasks to the front of the list.
1655 */
5f41a31d
CH		 1656 switch (cmd->sam_task_attr) {
1657 case MSG_HEAD_TAG:
1658 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1659 "se_ordered_id: %u\n",
1660 cmd->t_task_cdb[0], cmd->se_ordered_id);
019c4ca6 1661 return false;
5f41a31d
CH		 1662 case MSG_ORDERED_TAG:
1663 atomic_inc(&dev->dev_ordered_sync);
c66ac9db
NB		 1664 smp_mb__after_atomic_inc();
1665
5f41a31d
CH		 1666 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1667 " se_ordered_id: %u\n",
1668 cmd->t_task_cdb[0], cmd->se_ordered_id);
1669
c66ac9db 1670 /*
5f41a31d
CH		 1671 * Execute an ORDERED command if no other older commands
1672 * exist that need to be completed first.
c66ac9db 1673 */
5f41a31d 1674 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1675 return false;
5f41a31d
CH		 1676 break;
1677 default:
c66ac9db
NB		 1678 /*
1679 * For SIMPLE and UNTAGGED Task Attribute commands
1680 */
5f41a31d 1681 atomic_inc(&dev->simple_cmds);
c66ac9db 1682 smp_mb__after_atomic_inc();
5f41a31d 1683 break;
c66ac9db 1684 }
5f41a31d 1685
019c4ca6
CH		 1686 if (atomic_read(&dev->dev_ordered_sync) == 0)
1687 return false;
c66ac9db 1688
019c4ca6
CH		 1689 spin_lock(&dev->delayed_cmd_lock);
1690 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1691 spin_unlock(&dev->delayed_cmd_lock);
1692
1693 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1694 " delayed CMD list, se_ordered_id: %u\n",
1695 cmd->t_task_cdb[0], cmd->sam_task_attr,
1696 cmd->se_ordered_id);
1697 return true;
1698}
1699
1700void target_execute_cmd(struct se_cmd *cmd)
1701{
1702 /*
1703 * If the received CDB has aleady been aborted stop processing it here.
1704 */
5bd665f2
LT		 1705 if (transport_check_aborted_status(cmd, 1)) {
1706 complete(&cmd->transport_lun_stop_comp);
5f41a31d 1707 return;
c66ac9db 1708 }
c66ac9db 1709
c66ac9db 1710 /*
019c4ca6
CH		 1711 * Determine if IOCTL context caller in requesting the stopping of this
1712 * command for LUN shutdown purposes.
c66ac9db 1713 */
019c4ca6
CH		 1714 spin_lock_irq(&cmd->t_state_lock);
1715 if (cmd->transport_state & CMD_T_LUN_STOP) {
1716 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1717 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1718
1719 cmd->transport_state &= ~CMD_T_ACTIVE;
1720 spin_unlock_irq(&cmd->t_state_lock);
1721 complete(&cmd->transport_lun_stop_comp);
1722 return;
1723 }
1724 /*
1725 * Determine if frontend context caller is requesting the stopping of
1726 * this command for frontend exceptions.
1727 */
1728 if (cmd->transport_state & CMD_T_STOP) {
1729 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1730 __func__, __LINE__,
1731 cmd->se_tfo->get_task_tag(cmd));
1732
1733 spin_unlock_irq(&cmd->t_state_lock);
1734 complete(&cmd->t_transport_stop_comp);
1735 return;
1736 }
1737
1738 cmd->t_state = TRANSPORT_PROCESSING;
1a398b97 1739 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
019c4ca6
CH		 1740 spin_unlock_irq(&cmd->t_state_lock);
1741
1a398b97
NB		 1742 if (target_handle_task_attr(cmd)) {
1743 spin_lock_irq(&cmd->t_state_lock);
1744 cmd->transport_state &= ~CMD_T_BUSY|CMD_T_SENT;
1745 spin_unlock_irq(&cmd->t_state_lock);
1746 return;
1747 }
1748
1749 __target_execute_cmd(cmd);
c66ac9db 1750}
70baf0ab 1751EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1752
5f41a31d
CH		 1753/*
1754 * Process all commands up to the last received ORDERED task attribute which
1755 * requires another blocking boundary
1756 */
1757static void target_restart_delayed_cmds(struct se_device *dev)
1758{
1759 for (;;) {
1760 struct se_cmd *cmd;
1761
1762 spin_lock(&dev->delayed_cmd_lock);
1763 if (list_empty(&dev->delayed_cmd_list)) {
1764 spin_unlock(&dev->delayed_cmd_lock);
1765 break;
1766 }
1767
1768 cmd = list_entry(dev->delayed_cmd_list.next,
1769 struct se_cmd, se_delayed_node);
1770 list_del(&cmd->se_delayed_node);
1771 spin_unlock(&dev->delayed_cmd_lock);
1772
1773 __target_execute_cmd(cmd);
1774
1775 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1776 break;
1777 }
1778}
1779
c66ac9db 1780/*
35e0e757 1781 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1782 * and ordered cmds need to have their tasks added to the execution queue.
1783 */
1784static void transport_complete_task_attr(struct se_cmd *cmd)
1785{
5951146d 1786 struct se_device *dev = cmd->se_dev;
c66ac9db 1787
019c4ca6
CH		 1788 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
1789 return;
1790
e66ecd50 1791 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 1792 atomic_dec(&dev->simple_cmds);
1793 smp_mb__after_atomic_dec();
1794 dev->dev_cur_ordered_id++;
6708bb27 1795 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1796 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1797 cmd->se_ordered_id);
e66ecd50 1798 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db 1799 dev->dev_cur_ordered_id++;
6708bb27 1800 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1801 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1802 cmd->se_ordered_id);
e66ecd50 1803 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db
NB		 1804 atomic_dec(&dev->dev_ordered_sync);
1805 smp_mb__after_atomic_dec();
c66ac9db
NB		 1806
1807 dev->dev_cur_ordered_id++;
6708bb27 1808 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1809 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1810 }
c66ac9db 1811
5f41a31d 1812 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1813}
1814
e057f533 1815static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1816{
1817 int ret = 0;
1818
019c4ca6 1819 transport_complete_task_attr(cmd);
e057f533
CH		 1820
1821 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
e5c0d6ad 1822 trace_target_cmd_complete(cmd);
e057f533
CH		 1823 ret = cmd->se_tfo->queue_status(cmd);
1824 if (ret)
1825 goto out;
1826 }
07bde79a
NB		 1827
1828 switch (cmd->data_direction) {
1829 case DMA_FROM_DEVICE:
e5c0d6ad 1830 trace_target_cmd_complete(cmd);
07bde79a
NB		 1831 ret = cmd->se_tfo->queue_data_in(cmd);
1832 break;
1833 case DMA_TO_DEVICE:
64577407 1834 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a
NB		 1835 ret = cmd->se_tfo->queue_data_in(cmd);
1836 if (ret < 0)
e057f533 1837 break;
07bde79a
NB		 1838 }
1839 /* Fall through for DMA_TO_DEVICE */
1840 case DMA_NONE:
e5c0d6ad 1841 trace_target_cmd_complete(cmd);
07bde79a
NB		 1842 ret = cmd->se_tfo->queue_status(cmd);
1843 break;
1844 default:
1845 break;
1846 }
1847
e057f533
CH		 1848out:
1849 if (ret < 0) {
1850 transport_handle_queue_full(cmd, cmd->se_dev);
1851 return;
1852 }
1853 transport_lun_remove_cmd(cmd);
1854 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1855}
1856
1857static void transport_handle_queue_full(
1858 struct se_cmd *cmd,
e057f533 1859 struct se_device *dev)
07bde79a
NB		 1860{
1861 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a
NB		 1862 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1863 atomic_inc(&dev->dev_qf_count);
1864 smp_mb__after_atomic_inc();
1865 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1866
1867 schedule_work(&cmd->se_dev->qf_work_queue);
1868}
1869
35e0e757 1870static void target_complete_ok_work(struct work_struct *work)
c66ac9db 1871{
35e0e757 1872 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 1873 int ret;
35e0e757 1874
c66ac9db
NB		 1875 /*
1876 * Check if we need to move delayed/dormant tasks from cmds on the
1877 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1878 * Attribute.
1879 */
019c4ca6
CH		 1880 transport_complete_task_attr(cmd);
1881
07bde79a
NB		 1882 /*
1883 * Check to schedule QUEUE_FULL work, or execute an existing
1884 * cmd->transport_qf_callback()
1885 */
1886 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
1887 schedule_work(&cmd->se_dev->qf_work_queue);
1888
c66ac9db 1889 /*
d5829eac 1890 * Check if we need to send a sense buffer from
c66ac9db
NB		 1891 * the struct se_cmd in question.
1892 */
1893 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 1894 WARN_ON(!cmd->scsi_status);
27a27099
PB		 1895 ret = transport_send_check_condition_and_sense(
1896 cmd, 0, 1);
1897 if (ret == -EAGAIN || ret == -ENOMEM)
1898 goto queue_full;
1899
1900 transport_lun_remove_cmd(cmd);
1901 transport_cmd_check_stop_to_fabric(cmd);
1902 return;
c66ac9db
NB		 1903 }
1904 /*
25985edc 1905 * Check for a callback, used by amongst other things
a6b0133c 1906 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 1907 */
a6b0133c
NB		 1908 if (cmd->transport_complete_callback) {
1909 sense_reason_t rc;
1910
1911 rc = cmd->transport_complete_callback(cmd);
a2890087 1912 if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
a6b0133c 1913 return;
a2890087
NB		 1914 } else if (rc) {
1915 ret = transport_send_check_condition_and_sense(cmd,
1916 rc, 0);
1917 if (ret == -EAGAIN || ret == -ENOMEM)
1918 goto queue_full;
a6b0133c 1919
a2890087
NB		 1920 transport_lun_remove_cmd(cmd);
1921 transport_cmd_check_stop_to_fabric(cmd);
1922 return;
1923 }
a6b0133c 1924 }
c66ac9db
NB		 1925
1926 switch (cmd->data_direction) {
1927 case DMA_FROM_DEVICE:
1928 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1929 if (cmd->se_lun->lun_sep) {
1930 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1931 cmd->data_length;
1932 }
1933 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 1934
e5c0d6ad 1935 trace_target_cmd_complete(cmd);
07bde79a 1936 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1937 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1938 goto queue_full;
c66ac9db
NB		 1939 break;
1940 case DMA_TO_DEVICE:
1941 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1942 if (cmd->se_lun->lun_sep) {
1943 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 1944 cmd->data_length;
1945 }
1946 spin_unlock(&cmd->se_lun->lun_sep_lock);
1947 /*
1948 * Check if we need to send READ payload for BIDI-COMMAND
1949 */
64577407 1950 if (cmd->se_cmd_flags & SCF_BIDI) {
c66ac9db 1951 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 1952 if (cmd->se_lun->lun_sep) {
1953 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 1954 cmd->data_length;
1955 }
1956 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 1957 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 1958 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1959 goto queue_full;
c66ac9db
NB		 1960 break;
1961 }
1962 /* Fall through for DMA_TO_DEVICE */
1963 case DMA_NONE:
e5c0d6ad 1964 trace_target_cmd_complete(cmd);
07bde79a 1965 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 1966 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1967 goto queue_full;
c66ac9db
NB		 1968 break;
1969 default:
1970 break;
1971 }
1972
1973 transport_lun_remove_cmd(cmd);
1974 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1975 return;
1976
1977queue_full:
6708bb27 1978 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 1979 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 1980 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1981 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 1982}
1983
6708bb27 1984static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 1985{
ec98f782 1986 struct scatterlist *sg;
ec98f782 1987 int count;
c66ac9db 1988
6708bb27
AG		 1989 for_each_sg(sgl, sg, nents, count)
1990 __free_page(sg_page(sg));
c66ac9db 1991
6708bb27
AG		 1992 kfree(sgl);
1993}
c66ac9db 1994
47e459e6
NB		 1995static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
1996{
1997 /*
1998 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
1999 * emulation, and free + reset pointers if necessary..
2000 */
2001 if (!cmd->t_data_sg_orig)
2002 return;
2003
2004 kfree(cmd->t_data_sg);
2005 cmd->t_data_sg = cmd->t_data_sg_orig;
2006 cmd->t_data_sg_orig = NULL;
2007 cmd->t_data_nents = cmd->t_data_nents_orig;
2008 cmd->t_data_nents_orig = 0;
2009}
2010
6708bb27
AG		 2011static inline void transport_free_pages(struct se_cmd *cmd)
2012{
47e459e6
NB		 2013 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
2014 transport_reset_sgl_orig(cmd);
6708bb27 2015 return;
47e459e6
NB		 2016 }
2017 transport_reset_sgl_orig(cmd);
6708bb27
AG		 2018
2019 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2020 cmd->t_data_sg = NULL;
2021 cmd->t_data_nents = 0;
c66ac9db 2022
6708bb27 2023 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2024 cmd->t_bidi_data_sg = NULL;
2025 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 2026}
2027
e26d99ae
CH		 2028/**
2029 * transport_release_cmd - free a command
2030 * @cmd: command to free
2031 *
2032 * This routine unconditionally frees a command, and reference counting
2033 * or list removal must be done in the caller.
2034 */
d5ddad41 2035static int transport_release_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2036{
2037 BUG_ON(!cmd->se_tfo);
2038
c8e31f26 2039 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 2040 core_tmr_release_req(cmd->se_tmr_req);
2041 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2042 kfree(cmd->t_task_cdb);
2043 /*
7481deb4
NB		 2044 * If this cmd has been setup with target_get_sess_cmd(), drop
2045 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2046 */
ca24976a 2047 return target_put_sess_cmd(cmd->se_sess, cmd);
e26d99ae
CH		 2048}
2049
d3df7825
CH		 2050/**
2051 * transport_put_cmd - release a reference to a command
2052 * @cmd: command to release
2053 *
2054 * This routine releases our reference to the command and frees it if possible.
2055 */
d5ddad41 2056static int transport_put_cmd(struct se_cmd *cmd)
c66ac9db 2057{
c66ac9db 2058 transport_free_pages(cmd);
d5ddad41 2059 return transport_release_cmd(cmd);
c66ac9db 2060}
c66ac9db 2061
4949314c 2062void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2063{
ec98f782 2064 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2065 struct page **pages;
2066 int i;
05d1c7c0
AG		 2067
2068 /*
ec98f782
AG		 2069 * We need to take into account a possible offset here for fabrics like
2070 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2071 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2072 */
4949314c
AG		 2073 if (!cmd->t_data_nents)
2074 return NULL;
3717ef0c
PB		 2075
2076 BUG_ON(!sg);
2077 if (cmd->t_data_nents == 1)
4949314c
AG		 2078 return kmap(sg_page(sg)) + sg->offset;
2079
2080 /* >1 page. use vmap */
2081 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2082 if (!pages)
4949314c
AG		 2083 return NULL;
2084
2085 /* convert sg[] to pages[] */
2086 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2087 pages[i] = sg_page(sg);
2088 }
2089
2090 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2091 kfree(pages);
de103c93 2092 if (!cmd->t_data_vmap)
4949314c
AG		 2093 return NULL;
2094
2095 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2096}
4949314c 2097EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2098
4949314c 2099void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2100{
a1edf9cf 2101 if (!cmd->t_data_nents) {
4949314c 2102 return;
a1edf9cf 2103 } else if (cmd->t_data_nents == 1) {
4949314c 2104 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2105 return;
2106 }
4949314c
AG		 2107
2108 vunmap(cmd->t_data_vmap);
2109 cmd->t_data_vmap = NULL;
05d1c7c0 2110}
4949314c 2111EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2112
c66ac9db 2113static int
20093994
NB		 2114target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2115 bool zero_page)
c66ac9db 2116{
20093994 2117 struct scatterlist *sg;
ec98f782 2118 struct page *page;
20093994
NB		 2119 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2120 unsigned int nent;
ec98f782 2121 int i = 0;
c66ac9db 2122
20093994
NB		 2123 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2124 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2125 if (!sg)
ec98f782 2126 return -ENOMEM;
c66ac9db 2127
20093994 2128 sg_init_table(sg, nent);
9db9da33 2129
ec98f782
AG		 2130 while (length) {
2131 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2132 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2133 if (!page)
2134 goto out;
c66ac9db 2135
20093994 2136 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2137 length -= page_len;
2138 i++;
c66ac9db 2139 }
20093994
NB		 2140 *sgl = sg;
2141 *nents = nent;
c66ac9db 2142 return 0;
c66ac9db 2143
ec98f782 2144out:
d0e27c88 2145 while (i > 0) {
ec98f782 2146 i--;
20093994 2147 __free_page(sg_page(&sg[i]));
c66ac9db 2148 }
20093994 2149 kfree(sg);
ec98f782 2150 return -ENOMEM;
c66ac9db
NB		 2151}
2152
da0f7619 2153/*
b16a35b0
AG		 2154 * Allocate any required resources to execute the command. For writes we
2155 * might not have the payload yet, so notify the fabric via a call to
2156 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2157 */
de103c93
CH		 2158sense_reason_t
2159transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2160{
c66ac9db
NB		 2161 int ret = 0;
2162
2163 /*
2164 * Determine is the TCM fabric module has already allocated physical
2165 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2166 * beforehand.
c66ac9db 2167 */
ec98f782
AG		 2168 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2169 cmd->data_length) {
20093994
NB		 2170 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
2171
8cefe07b
NB		 2172 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2173 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2174 u32 bidi_length;
2175
2176 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2177 bidi_length = cmd->t_task_nolb *
2178 cmd->se_dev->dev_attrib.block_size;
2179 else
2180 bidi_length = cmd->data_length;
2181
2182 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2183 &cmd->t_bidi_data_nents,
2184 bidi_length, zero_flag);
2185 if (ret < 0)
2186 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2187 }
2188
20093994
NB		 2189 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2190 cmd->data_length, zero_flag);
c66ac9db 2191 if (ret < 0)
de103c93 2192 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2193 }
c66ac9db 2194 /*
c3196f0c
CH		 2195 * If this command is not a write we can execute it right here,
2196 * for write buffers we need to notify the fabric driver first
2197 * and let it call back once the write buffers are ready.
c66ac9db 2198 */
5f41a31d 2199 target_add_to_state_list(cmd);
c3196f0c
CH		 2200 if (cmd->data_direction != DMA_TO_DEVICE) {
2201 target_execute_cmd(cmd);
2202 return 0;
2203 }
862e6389 2204 transport_cmd_check_stop(cmd, false, true);
c3196f0c
CH		 2205
2206 ret = cmd->se_tfo->write_pending(cmd);
2207 if (ret == -EAGAIN || ret == -ENOMEM)
2208 goto queue_full;
2209
de103c93
CH		 2210 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2211 WARN_ON(ret);
2212
b69c1fcf 2213 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2214
c3196f0c
CH		 2215queue_full:
2216 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2217 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2218 transport_handle_queue_full(cmd, cmd->se_dev);
2219 return 0;
c66ac9db 2220}
a1d8b49a 2221EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2222
e057f533 2223static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2224{
f147abb4
NB		 2225 int ret;
2226
2227 ret = cmd->se_tfo->write_pending(cmd);
2228 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2229 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2230 cmd);
2231 transport_handle_queue_full(cmd, cmd->se_dev);
2232 }
07bde79a
NB		 2233}
2234
d5ddad41 2235int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2236{
d5ddad41
NB		 2237 int ret = 0;
2238
d14921d6 2239 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2240 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2241 transport_wait_for_tasks(cmd);
2242
d5ddad41 2243 ret = transport_release_cmd(cmd);
d14921d6
NB		 2244 } else {
2245 if (wait_for_tasks)
2246 transport_wait_for_tasks(cmd);
2247
82f1c8a4 2248 if (cmd->se_lun)
c66ac9db 2249 transport_lun_remove_cmd(cmd);
c66ac9db 2250
d5ddad41 2251 ret = transport_put_cmd(cmd);
c66ac9db 2252 }
d5ddad41 2253 return ret;
c66ac9db
NB		 2254}
2255EXPORT_SYMBOL(transport_generic_free_cmd);
2256
a17f091d
NB		 2257/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2258 * @se_sess: session to reference
2259 * @se_cmd: command descriptor to add
a6360785 2260 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2261 */
20361e69 2262int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
bc187ea6 2263 bool ack_kref)
a17f091d
NB		 2264{
2265 unsigned long flags;
bc187ea6 2266 int ret = 0;
a17f091d 2267
7481deb4 2268 kref_init(&se_cmd->cmd_kref);
a6360785
NB		 2269 /*
2270 * Add a second kref if the fabric caller is expecting to handle
2271 * fabric acknowledgement that requires two target_put_sess_cmd()
2272 * invocations before se_cmd descriptor release.
2273 */
86715569 2274 if (ack_kref == true) {
a6360785 2275 kref_get(&se_cmd->cmd_kref);
86715569
NB		 2276 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2277 }
7481deb4 2278
a17f091d 2279 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2280 if (se_sess->sess_tearing_down) {
2281 ret = -ESHUTDOWN;
2282 goto out;
2283 }
a17f091d 2284 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2285out:
a17f091d 2286 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
bc187ea6 2287 return ret;
a17f091d 2288}
20361e69 2289EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2290
7481deb4 2291static void target_release_cmd_kref(struct kref *kref)
a17f091d 2292{
7481deb4
NB		 2293 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2294 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2295
a17f091d 2296 if (list_empty(&se_cmd->se_cmd_list)) {
ccf5ae83 2297 spin_unlock(&se_sess->sess_cmd_lock);
ffc32d52 2298 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2299 return;
a17f091d 2300 }
a17f091d 2301 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
ccf5ae83 2302 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2303 complete(&se_cmd->cmd_wait_comp);
7481deb4 2304 return;
a17f091d
NB		 2305 }
2306 list_del(&se_cmd->se_cmd_list);
ccf5ae83 2307 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2308
7481deb4
NB		 2309 se_cmd->se_tfo->release_cmd(se_cmd);
2310}
2311
2312/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2313 * @se_sess: session to reference
2314 * @se_cmd: command descriptor to drop
2315 */
2316int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2317{
ccf5ae83
JE		 2318 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2319 &se_sess->sess_cmd_lock);
a17f091d
NB		 2320}
2321EXPORT_SYMBOL(target_put_sess_cmd);
2322
1c7b13fe
RD		 2323/* target_sess_cmd_list_set_waiting - Flag all commands in
2324 * sess_cmd_list to complete cmd_wait_comp. Set
2325 * sess_tearing_down so no more commands are queued.
2326 * @se_sess: session to flag
a17f091d 2327 */
1c7b13fe 2328void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2329{
2330 struct se_cmd *se_cmd;
2331 unsigned long flags;
2332
a17f091d 2333 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2334 if (se_sess->sess_tearing_down) {
2335 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2336 return;
2337 }
1c7b13fe 2338 se_sess->sess_tearing_down = 1;
9b31a328 2339 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2340
9b31a328 2341 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
a17f091d
NB		 2342 se_cmd->cmd_wait_set = 1;
2343
2344 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2345}
1c7b13fe 2346EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2347
2348/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2349 * @se_sess: session to wait for active I/O
a17f091d 2350 */
be646c2d 2351void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2352{
2353 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2354 unsigned long flags;
a17f091d
NB		 2355
2356 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2357 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2358 list_del(&se_cmd->se_cmd_list);
2359
2360 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2361 " %d\n", se_cmd, se_cmd->t_state,
2362 se_cmd->se_tfo->get_cmd_state(se_cmd));
2363
be646c2d
JE		 2364 wait_for_completion(&se_cmd->cmd_wait_comp);
2365 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2366 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2367 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2368
2369 se_cmd->se_tfo->release_cmd(se_cmd);
2370 }
9b31a328
NB		 2371
2372 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2373 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2374 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2375
a17f091d
NB		 2376}
2377EXPORT_SYMBOL(target_wait_for_sess_cmds);
2378
c66ac9db
NB		 2379/* transport_lun_wait_for_tasks():
2380 *
2381 * Called from ConfigFS context to stop the passed struct se_cmd to allow
2382 * an struct se_lun to be successfully shutdown.
2383 */
2384static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2385{
2386 unsigned long flags;
cf572a96
CH		 2387 int ret = 0;
2388
c66ac9db
NB		 2389 /*
2390 * If the frontend has already requested this struct se_cmd to
2391 * be stopped, we can safely ignore this struct se_cmd.
2392 */
a1d8b49a 2393 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b
CH		 2394 if (cmd->transport_state & CMD_T_STOP) {
2395 cmd->transport_state &= ~CMD_T_LUN_STOP;
2396
2397 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2398 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2399 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
862e6389 2400 transport_cmd_check_stop(cmd, false, false);
e3d6f909 2401 return -EPERM;
c66ac9db 2402 }
7d680f3b 2403 cmd->transport_state |= CMD_T_LUN_FE_STOP;
a1d8b49a 2404 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2405
cf572a96
CH		 2406 // XXX: audit task_flags checks.
2407 spin_lock_irqsave(&cmd->t_state_lock, flags);
2408 if ((cmd->transport_state & CMD_T_BUSY) &&
2409 (cmd->transport_state & CMD_T_SENT)) {
2410 if (!target_stop_cmd(cmd, &flags))
2411 ret++;
cf572a96 2412 }
5f41a31d 2413 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2414
785fdf70
CH		 2415 pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2416 " %d\n", cmd, ret);
c66ac9db 2417 if (!ret) {
6708bb27 2418 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 2419 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 2420 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 2421 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 2422 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2423 }
c66ac9db
NB		 2424
2425 return 0;
2426}
2427
c66ac9db
NB		 2428static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2429{
2430 struct se_cmd *cmd = NULL;
2431 unsigned long lun_flags, cmd_flags;
2432 /*
2433 * Do exception processing and return CHECK_CONDITION status to the
2434 * Initiator Port.
2435 */
2436 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 2437 while (!list_empty(&lun->lun_cmd_list)) {
2438 cmd = list_first_entry(&lun->lun_cmd_list,
2439 struct se_cmd, se_lun_node);
3d26fea0 2440 list_del_init(&cmd->se_lun_node);
5951146d 2441
a1d8b49a 2442 spin_lock(&cmd->t_state_lock);
6708bb27 2443 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 2444 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 2445 cmd->se_lun->unpacked_lun,
2446 cmd->se_tfo->get_task_tag(cmd));
7d680f3b 2447 cmd->transport_state |= CMD_T_LUN_STOP;
a1d8b49a 2448 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 2449
2450 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2451
6708bb27
AG		 2452 if (!cmd->se_lun) {
2453 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 2454 cmd->se_tfo->get_task_tag(cmd),
2455 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 2456 BUG();
2457 }
2458 /*
2459 * If the Storage engine still owns the iscsi_cmd_t, determine
2460 * and/or stop its context.
2461 */
6708bb27 2462 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 2463 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2464 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2465
e3d6f909 2466 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 2467 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2468 continue;
2469 }
2470
6708bb27 2471 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 2472 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 2473 cmd->se_lun->unpacked_lun,
2474 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2475
a1d8b49a 2476 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2477 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
a1d8b49a 2478 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2479 goto check_cond;
2480 }
7d680f3b 2481 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
cf572a96 2482 target_remove_from_state_list(cmd);
a1d8b49a 2483 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db 2484
c66ac9db
NB		 2485 /*
2486 * The Storage engine stopped this struct se_cmd before it was
2487 * send to the fabric frontend for delivery back to the
2488 * Initiator Node. Return this SCSI CDB back with an
2489 * CHECK_CONDITION status.
2490 */
2491check_cond:
2492 transport_send_check_condition_and_sense(cmd,
2493 TCM_NON_EXISTENT_LUN, 0);
2494 /*
2495 * If the fabric frontend is waiting for this iscsi_cmd_t to
2496 * be released, notify the waiting thread now that LU has
2497 * finished accessing it.
2498 */
a1d8b49a 2499 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
7d680f3b 2500 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
6708bb27 2501 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 2502 " struct se_cmd: %p ITT: 0x%08x\n",
2503 lun->unpacked_lun,
e3d6f909 2504 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2505
a1d8b49a 2506 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db 2507 cmd_flags);
862e6389 2508 transport_cmd_check_stop(cmd, false, false);
a1d8b49a 2509 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 2510 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2511 continue;
2512 }
6708bb27 2513 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 2514 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2515
a1d8b49a 2516 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 2517 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2518 }
2519 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2520}
2521
2522static int transport_clear_lun_thread(void *p)
2523{
8359cf43 2524 struct se_lun *lun = p;
c66ac9db
NB		 2525
2526 __transport_clear_lun_from_sessions(lun);
2527 complete(&lun->lun_shutdown_comp);
2528
2529 return 0;
2530}
2531
2532int transport_clear_lun_from_sessions(struct se_lun *lun)
2533{
2534 struct task_struct *kt;
2535
5951146d 2536 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 2537 "tcm_cl_%u", lun->unpacked_lun);
2538 if (IS_ERR(kt)) {
6708bb27 2539 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2540 return PTR_ERR(kt);
c66ac9db
NB		 2541 }
2542 wait_for_completion(&lun->lun_shutdown_comp);
2543
2544 return 0;
2545}
2546
d14921d6
NB		 2547/**
2548 * transport_wait_for_tasks - wait for completion to occur
2549 * @cmd: command to wait
c66ac9db 2550 *
d14921d6
NB		 2551 * Called from frontend fabric context to wait for storage engine
2552 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2553 */
a17f091d 2554bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2555{
2556 unsigned long flags;
2557
a1d8b49a 2558 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2559 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2560 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2561 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2562 return false;
d14921d6 2563 }
cb4f4d3c 2564
c8e31f26
AG		 2565 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2566 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2567 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2568 return false;
d14921d6 2569 }
c66ac9db
NB		 2570 /*
2571 * If we are already stopped due to an external event (ie: LUN shutdown)
2572 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 2573 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 2574 * transport_clear_lun_from_sessions() once the ConfigFS context caller
2575 * has completed its operation on the struct se_cmd.
2576 */
7d680f3b 2577 if (cmd->transport_state & CMD_T_LUN_STOP) {
6708bb27 2578 pr_debug("wait_for_tasks: Stopping"
e3d6f909 2579 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 2580 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 2581 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 2582 /*
2583 * There is a special case for WRITES where a FE exception +
2584 * LUN shutdown means ConfigFS context is still sleeping on
2585 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2586 * We go ahead and up transport_lun_stop_comp just to be sure
2587 * here.
2588 */
a1d8b49a
AG		 2589 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2590 complete(&cmd->transport_lun_stop_comp);
2591 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2592 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2593
cf572a96 2594 target_remove_from_state_list(cmd);
c66ac9db
NB		 2595 /*
2596 * At this point, the frontend who was the originator of this
2597 * struct se_cmd, now owns the structure and can be released through
2598 * normal means below.
2599 */
6708bb27 2600 pr_debug("wait_for_tasks: Stopped"
e3d6f909 2601 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 2602 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 2603 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2604
7d680f3b 2605 cmd->transport_state &= ~CMD_T_LUN_STOP;
c66ac9db 2606 }
7d680f3b 2607
3d28934a 2608 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2609 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2610 return false;
d14921d6 2611 }
c66ac9db 2612
7d680f3b 2613 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2614
6708bb27 2615 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 2616 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 2617 cmd, cmd->se_tfo->get_task_tag(cmd),
2618 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2619
a1d8b49a 2620 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2621
a1d8b49a 2622 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2623
a1d8b49a 2624 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2625 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2626
35d1efe8 2627 pr_debug("wait_for_tasks: Stopped wait_for_completion("
a1d8b49a 2628 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 2629 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2630
d14921d6 2631 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2632
2633 return true;
c66ac9db 2634}
d14921d6 2635EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2636
2637static int transport_get_sense_codes(
2638 struct se_cmd *cmd,
2639 u8 *asc,
2640 u8 *ascq)
2641{
2642 *asc = cmd->scsi_asc;
2643 *ascq = cmd->scsi_ascq;
2644
2645 return 0;
2646}
2647
de103c93
CH		 2648int
2649transport_send_check_condition_and_sense(struct se_cmd *cmd,
2650 sense_reason_t reason, int from_transport)
c66ac9db
NB		 2651{
2652 unsigned char *buffer = cmd->sense_buffer;
2653 unsigned long flags;
c66ac9db
NB		 2654 u8 asc = 0, ascq = 0;
2655
a1d8b49a 2656 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2657 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2658 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2659 return 0;
2660 }
2661 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2662 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2663
2664 if (!reason && from_transport)
2665 goto after_reason;
2666
2667 if (!from_transport)
2668 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
9c58b7dd 2669
c66ac9db
NB		 2670 /*
2671 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2672 * SENSE KEY values from include/scsi/scsi.h
2673 */
2674 switch (reason) {
ba829137
HR		 2675 case TCM_NO_SENSE:
2676 /* CURRENT ERROR */
2677 buffer[0] = 0x70;
2678 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2679 /* Not Ready */
2680 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2681 /* NO ADDITIONAL SENSE INFORMATION */
2682 buffer[SPC_ASC_KEY_OFFSET] = 0;
2683 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2684 break;
c66ac9db 2685 case TCM_NON_EXISTENT_LUN:
eb39d340 2686 /* CURRENT ERROR */
9c58b7dd
RD		 2687 buffer[0] = 0x70;
2688 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340 2689 /* ILLEGAL REQUEST */
9c58b7dd 2690 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
eb39d340 2691 /* LOGICAL UNIT NOT SUPPORTED */
9c58b7dd 2692 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
eb39d340 2693 break;
c66ac9db
NB		 2694 case TCM_UNSUPPORTED_SCSI_OPCODE:
2695 case TCM_SECTOR_COUNT_TOO_MANY:
2696 /* CURRENT ERROR */
9c58b7dd
RD		 2697 buffer[0] = 0x70;
2698 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2699 /* ILLEGAL REQUEST */
9c58b7dd 2700 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2701 /* INVALID COMMAND OPERATION CODE */
9c58b7dd 2702 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
c66ac9db
NB		 2703 break;
2704 case TCM_UNKNOWN_MODE_PAGE:
2705 /* CURRENT ERROR */
9c58b7dd
RD		 2706 buffer[0] = 0x70;
2707 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2708 /* ILLEGAL REQUEST */
9c58b7dd 2709 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2710 /* INVALID FIELD IN CDB */
9c58b7dd 2711 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2712 break;
2713 case TCM_CHECK_CONDITION_ABORT_CMD:
2714 /* CURRENT ERROR */
9c58b7dd
RD		 2715 buffer[0] = 0x70;
2716 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2717 /* ABORTED COMMAND */
9c58b7dd 2718 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2719 /* BUS DEVICE RESET FUNCTION OCCURRED */
9c58b7dd
RD		 2720 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2721 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
c66ac9db
NB		 2722 break;
2723 case TCM_INCORRECT_AMOUNT_OF_DATA:
2724 /* CURRENT ERROR */
9c58b7dd
RD		 2725 buffer[0] = 0x70;
2726 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2727 /* ABORTED COMMAND */
9c58b7dd 2728 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2729 /* WRITE ERROR */
9c58b7dd 2730 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2731 /* NOT ENOUGH UNSOLICITED DATA */
9c58b7dd 2732 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
c66ac9db
NB		 2733 break;
2734 case TCM_INVALID_CDB_FIELD:
2735 /* CURRENT ERROR */
9c58b7dd
RD		 2736 buffer[0] = 0x70;
2737 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2738 /* ILLEGAL REQUEST */
9c58b7dd 2739 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2740 /* INVALID FIELD IN CDB */
9c58b7dd 2741 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2742 break;
2743 case TCM_INVALID_PARAMETER_LIST:
2744 /* CURRENT ERROR */
9c58b7dd
RD		 2745 buffer[0] = 0x70;
2746 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2747 /* ILLEGAL REQUEST */
9c58b7dd 2748 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2749 /* INVALID FIELD IN PARAMETER LIST */
9c58b7dd 2750 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
c66ac9db 2751 break;
bb992e72
RD		 2752 case TCM_PARAMETER_LIST_LENGTH_ERROR:
2753 /* CURRENT ERROR */
2754 buffer[0] = 0x70;
2755 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2756 /* ILLEGAL REQUEST */
2757 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2758 /* PARAMETER LIST LENGTH ERROR */
2759 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2760 break;
c66ac9db
NB		 2761 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2762 /* CURRENT ERROR */
9c58b7dd
RD		 2763 buffer[0] = 0x70;
2764 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2765 /* ABORTED COMMAND */
9c58b7dd 2766 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2767 /* WRITE ERROR */
9c58b7dd 2768 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2769 /* UNEXPECTED_UNSOLICITED_DATA */
9c58b7dd 2770 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
c66ac9db
NB		 2771 break;
2772 case TCM_SERVICE_CRC_ERROR:
2773 /* CURRENT ERROR */
9c58b7dd
RD		 2774 buffer[0] = 0x70;
2775 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2776 /* ABORTED COMMAND */
9c58b7dd 2777 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2778 /* PROTOCOL SERVICE CRC ERROR */
9c58b7dd 2779 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
c66ac9db 2780 /* N/A */
9c58b7dd 2781 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
c66ac9db
NB		 2782 break;
2783 case TCM_SNACK_REJECTED:
2784 /* CURRENT ERROR */
9c58b7dd
RD		 2785 buffer[0] = 0x70;
2786 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2787 /* ABORTED COMMAND */
9c58b7dd 2788 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2789 /* READ ERROR */
9c58b7dd 2790 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
c66ac9db 2791 /* FAILED RETRANSMISSION REQUEST */
9c58b7dd 2792 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
c66ac9db
NB		 2793 break;
2794 case TCM_WRITE_PROTECTED:
2795 /* CURRENT ERROR */
9c58b7dd
RD		 2796 buffer[0] = 0x70;
2797 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2798 /* DATA PROTECT */
9c58b7dd 2799 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
c66ac9db 2800 /* WRITE PROTECTED */
9c58b7dd 2801 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
c66ac9db 2802 break;
e2397c70
RD		 2803 case TCM_ADDRESS_OUT_OF_RANGE:
2804 /* CURRENT ERROR */
9c58b7dd
RD		 2805 buffer[0] = 0x70;
2806 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
e2397c70 2807 /* ILLEGAL REQUEST */
9c58b7dd 2808 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
e2397c70 2809 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
9c58b7dd 2810 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
e2397c70 2811 break;
c66ac9db
NB		 2812 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2813 /* CURRENT ERROR */
9c58b7dd
RD		 2814 buffer[0] = 0x70;
2815 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2816 /* UNIT ATTENTION */
9c58b7dd 2817 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
c66ac9db 2818 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
9c58b7dd
RD		 2819 buffer[SPC_ASC_KEY_OFFSET] = asc;
2820 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2821 break;
2822 case TCM_CHECK_CONDITION_NOT_READY:
2823 /* CURRENT ERROR */
9c58b7dd
RD		 2824 buffer[0] = 0x70;
2825 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2826 /* Not Ready */
9c58b7dd 2827 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2828 transport_get_sense_codes(cmd, &asc, &ascq);
9c58b7dd
RD		 2829 buffer[SPC_ASC_KEY_OFFSET] = asc;
2830 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db 2831 break;
818b571c
NB		 2832 case TCM_MISCOMPARE_VERIFY:
2833 /* CURRENT ERROR */
2834 buffer[0] = 0x70;
2835 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2836 buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE;
2837 /* MISCOMPARE DURING VERIFY OPERATION */
2838 buffer[SPC_ASC_KEY_OFFSET] = 0x1d;
2839 buffer[SPC_ASCQ_KEY_OFFSET] = 0x00;
2840 break;
c66ac9db
NB		 2841 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2842 default:
2843 /* CURRENT ERROR */
9c58b7dd
RD		 2844 buffer[0] = 0x70;
2845 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
ad673282
JE		 2846 /*
2847 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2848 * Solaris initiators. Returning NOT READY instead means the
2849 * operations will be retried a finite number of times and we
2850 * can survive intermittent errors.
2851 */
2852 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2853 /* LOGICAL UNIT COMMUNICATION FAILURE */
18a9df42 2854 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
c66ac9db
NB		 2855 break;
2856 }
2857 /*
2858 * This code uses linux/include/scsi/scsi.h SAM status codes!
2859 */
2860 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2861 /*
2862 * Automatically padded, this value is encoded in the fabric's
2863 * data_length response PDU containing the SCSI defined sense data.
2864 */
9c58b7dd 2865 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
c66ac9db
NB		 2866
2867after_reason:
e5c0d6ad 2868 trace_target_cmd_complete(cmd);
07bde79a 2869 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2870}
2871EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2872
2873int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2874{
c18bc7d8
RD		 2875 if (!(cmd->transport_state & CMD_T_ABORTED))
2876 return 0;
c66ac9db 2877
c18bc7d8
RD		 2878 if (!send_status || (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
2879 return 1;
8b1e1244 2880
c18bc7d8
RD		 2881 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2882 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2883
c18bc7d8 2884 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e5c0d6ad 2885 trace_target_cmd_complete(cmd);
c18bc7d8
RD		 2886 cmd->se_tfo->queue_status(cmd);
2887
2888 return 1;
c66ac9db
NB		 2889}
2890EXPORT_SYMBOL(transport_check_aborted_status);
2891
2892void transport_send_task_abort(struct se_cmd *cmd)
2893{
c252f003
NB		 2894 unsigned long flags;
2895
2896 spin_lock_irqsave(&cmd->t_state_lock, flags);
3ea160b3 2897 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION | SCF_SENT_DELAYED_TAS)) {
c252f003
NB		 2898 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2899 return;
2900 }
2901 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2902
c66ac9db
NB		 2903 /*
2904 * If there are still expected incoming fabric WRITEs, we wait
2905 * until until they have completed before sending a TASK_ABORTED
2906 * response. This response with TASK_ABORTED status will be
2907 * queued back to fabric module by transport_check_aborted_status().
2908 */
2909 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2910 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 2911 cmd->transport_state |= CMD_T_ABORTED;
c66ac9db 2912 smp_mb__after_atomic_inc();
c66ac9db
NB		 2913 }
2914 }
2915 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 2916
72b59d6e
RD		 2917 transport_lun_remove_cmd(cmd);
2918
6708bb27 2919 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 2920 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 2921 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2922
e5c0d6ad 2923 trace_target_cmd_complete(cmd);
e3d6f909 2924 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2925}
2926
af877292 2927static void target_tmr_work(struct work_struct *work)
c66ac9db 2928{
af877292 2929 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 2930 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2931 struct se_tmr_req *tmr = cmd->se_tmr_req;
2932 int ret;
2933
2934 switch (tmr->function) {
5c6cd613 2935 case TMR_ABORT_TASK:
3d28934a 2936 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 2937 break;
5c6cd613
NB		 2938 case TMR_ABORT_TASK_SET:
2939 case TMR_CLEAR_ACA:
2940 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 2941 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
2942 break;
5c6cd613 2943 case TMR_LUN_RESET:
c66ac9db
NB		 2944 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
2945 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
2946 TMR_FUNCTION_REJECTED;
2947 break;
5c6cd613 2948 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 2949 tmr->response = TMR_FUNCTION_REJECTED;
2950 break;
5c6cd613 2951 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 2952 tmr->response = TMR_FUNCTION_REJECTED;
2953 break;
c66ac9db 2954 default:
6708bb27 2955 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 2956 tmr->function);
2957 tmr->response = TMR_FUNCTION_REJECTED;
2958 break;
2959 }
2960
2961 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 2962 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 2963
b7b8bef7 2964 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 2965}
2966
af877292
CH		 2967int transport_generic_handle_tmr(
2968 struct se_cmd *cmd)
c66ac9db 2969{
af877292
CH		 2970 INIT_WORK(&cmd->work, target_tmr_work);
2971 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 2972 return 0;
2973}
af877292 2974EXPORT_SYMBOL(transport_generic_handle_tmr);
Linux 6.x block layer and io_uring tree(s)