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