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target: Merge transport_cmd_finish_abort_tmr into transport_cmd_finish_abort
[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 *
6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
8 * Copyright (c) 2007-2010 Rising Tide Systems
9 * Copyright (c) 2008-2010 Linux-iSCSI.org
10 *
11 * Nicholas A. Bellinger <nab@kernel.org>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 *
27 ******************************************************************************/
28
c66ac9db
NB		 29#include <linux/net.h>
30#include <linux/delay.h>
31#include <linux/string.h>
32#include <linux/timer.h>
33#include <linux/slab.h>
34#include <linux/blkdev.h>
35#include <linux/spinlock.h>
c66ac9db
NB		 36#include <linux/kthread.h>
37#include <linux/in.h>
38#include <linux/cdrom.h>
39#include <asm/unaligned.h>
40#include <net/sock.h>
41#include <net/tcp.h>
42#include <scsi/scsi.h>
43#include <scsi/scsi_cmnd.h>
e66ecd50 44#include <scsi/scsi_tcq.h>
c66ac9db
NB		 45
46#include <target/target_core_base.h>
47#include <target/target_core_device.h>
48#include <target/target_core_tmr.h>
49#include <target/target_core_tpg.h>
50#include <target/target_core_transport.h>
51#include <target/target_core_fabric_ops.h>
52#include <target/target_core_configfs.h>
53
54#include "target_core_alua.h"
55#include "target_core_hba.h"
56#include "target_core_pr.h"
57#include "target_core_scdb.h"
58#include "target_core_ua.h"
59
e3d6f909 60static int sub_api_initialized;
c66ac9db
NB		 61
62static struct kmem_cache *se_cmd_cache;
63static struct kmem_cache *se_sess_cache;
64struct kmem_cache *se_tmr_req_cache;
65struct kmem_cache *se_ua_cache;
c66ac9db
NB		 66struct kmem_cache *t10_pr_reg_cache;
67struct kmem_cache *t10_alua_lu_gp_cache;
68struct kmem_cache *t10_alua_lu_gp_mem_cache;
69struct kmem_cache *t10_alua_tg_pt_gp_cache;
70struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
71
72/* Used for transport_dev_get_map_*() */
73typedef int (*map_func_t)(struct se_task *, u32);
74
75static int transport_generic_write_pending(struct se_cmd *);
5951146d 76static int transport_processing_thread(void *param);
c66ac9db
NB		 77static int __transport_execute_tasks(struct se_device *dev);
78static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a
NB		 79static int transport_complete_qf(struct se_cmd *cmd);
80static void transport_handle_queue_full(struct se_cmd *cmd,
81 struct se_device *dev, int (*qf_callback)(struct se_cmd *));
c66ac9db
NB		 82static void transport_direct_request_timeout(struct se_cmd *cmd);
83static void transport_free_dev_tasks(struct se_cmd *cmd);
a1d8b49a 84static u32 transport_allocate_tasks(struct se_cmd *cmd,
ec98f782 85 unsigned long long starting_lba,
c66ac9db 86 enum dma_data_direction data_direction,
ec98f782 87 struct scatterlist *sgl, unsigned int nents);
05d1c7c0 88static int transport_generic_get_mem(struct se_cmd *cmd);
39c05f32 89static void transport_put_cmd(struct se_cmd *cmd);
c66ac9db
NB		 90static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
91 struct se_queue_obj *qobj);
92static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
93static void transport_stop_all_task_timers(struct se_cmd *cmd);
94
e3d6f909 95int init_se_kmem_caches(void)
c66ac9db 96{
c66ac9db
NB		 97 se_cmd_cache = kmem_cache_create("se_cmd_cache",
98 sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
6708bb27
AG		 99 if (!se_cmd_cache) {
100 pr_err("kmem_cache_create for struct se_cmd failed\n");
c66ac9db
NB		 101 goto out;
102 }
103 se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
104 sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
105 0, NULL);
6708bb27
AG		 106 if (!se_tmr_req_cache) {
107 pr_err("kmem_cache_create() for struct se_tmr_req"
c66ac9db
NB		 108 " failed\n");
109 goto out;
110 }
111 se_sess_cache = kmem_cache_create("se_sess_cache",
112 sizeof(struct se_session), __alignof__(struct se_session),
113 0, NULL);
6708bb27
AG		 114 if (!se_sess_cache) {
115 pr_err("kmem_cache_create() for struct se_session"
c66ac9db
NB		 116 " failed\n");
117 goto out;
118 }
119 se_ua_cache = kmem_cache_create("se_ua_cache",
120 sizeof(struct se_ua), __alignof__(struct se_ua),
121 0, NULL);
6708bb27
AG		 122 if (!se_ua_cache) {
123 pr_err("kmem_cache_create() for struct se_ua failed\n");
c66ac9db
NB		 124 goto out;
125 }
c66ac9db
NB		 126 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
127 sizeof(struct t10_pr_registration),
128 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 129 if (!t10_pr_reg_cache) {
130 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db
NB		 131 " failed\n");
132 goto out;
133 }
134 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
135 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
136 0, NULL);
6708bb27
AG		 137 if (!t10_alua_lu_gp_cache) {
138 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db
NB		 139 " failed\n");
140 goto out;
141 }
142 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
143 sizeof(struct t10_alua_lu_gp_member),
144 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 145 if (!t10_alua_lu_gp_mem_cache) {
146 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db
NB		 147 "cache failed\n");
148 goto out;
149 }
150 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
151 sizeof(struct t10_alua_tg_pt_gp),
152 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 153 if (!t10_alua_tg_pt_gp_cache) {
154 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db
NB		 155 "cache failed\n");
156 goto out;
157 }
158 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
159 "t10_alua_tg_pt_gp_mem_cache",
160 sizeof(struct t10_alua_tg_pt_gp_member),
161 __alignof__(struct t10_alua_tg_pt_gp_member),
162 0, NULL);
6708bb27
AG		 163 if (!t10_alua_tg_pt_gp_mem_cache) {
164 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db
NB		 165 "mem_t failed\n");
166 goto out;
167 }
168
c66ac9db
NB		 169 return 0;
170out:
171 if (se_cmd_cache)
172 kmem_cache_destroy(se_cmd_cache);
173 if (se_tmr_req_cache)
174 kmem_cache_destroy(se_tmr_req_cache);
175 if (se_sess_cache)
176 kmem_cache_destroy(se_sess_cache);
177 if (se_ua_cache)
178 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 179 if (t10_pr_reg_cache)
180 kmem_cache_destroy(t10_pr_reg_cache);
181 if (t10_alua_lu_gp_cache)
182 kmem_cache_destroy(t10_alua_lu_gp_cache);
183 if (t10_alua_lu_gp_mem_cache)
184 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
185 if (t10_alua_tg_pt_gp_cache)
186 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
187 if (t10_alua_tg_pt_gp_mem_cache)
188 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
e3d6f909 189 return -ENOMEM;
c66ac9db
NB		 190}
191
e3d6f909 192void release_se_kmem_caches(void)
c66ac9db 193{
c66ac9db
NB		 194 kmem_cache_destroy(se_cmd_cache);
195 kmem_cache_destroy(se_tmr_req_cache);
196 kmem_cache_destroy(se_sess_cache);
197 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 198 kmem_cache_destroy(t10_pr_reg_cache);
199 kmem_cache_destroy(t10_alua_lu_gp_cache);
200 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
201 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
202 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
c66ac9db
NB		 203}
204
e3d6f909
AG		 205/* This code ensures unique mib indexes are handed out. */
206static DEFINE_SPINLOCK(scsi_mib_index_lock);
207static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 208
209/*
210 * Allocate a new row index for the entry type specified
211 */
212u32 scsi_get_new_index(scsi_index_t type)
213{
214 u32 new_index;
215
e3d6f909 216 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 217
e3d6f909
AG		 218 spin_lock(&scsi_mib_index_lock);
219 new_index = ++scsi_mib_index[type];
220 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 221
222 return new_index;
223}
224
c66ac9db
NB		 225void transport_init_queue_obj(struct se_queue_obj *qobj)
226{
227 atomic_set(&qobj->queue_cnt, 0);
228 INIT_LIST_HEAD(&qobj->qobj_list);
229 init_waitqueue_head(&qobj->thread_wq);
230 spin_lock_init(&qobj->cmd_queue_lock);
231}
232EXPORT_SYMBOL(transport_init_queue_obj);
233
234static int transport_subsystem_reqmods(void)
235{
236 int ret;
237
238 ret = request_module("target_core_iblock");
239 if (ret != 0)
6708bb27 240 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 241
242 ret = request_module("target_core_file");
243 if (ret != 0)
6708bb27 244 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 245
246 ret = request_module("target_core_pscsi");
247 if (ret != 0)
6708bb27 248 pr_err("Unable to load target_core_pscsi\n");
c66ac9db
NB		 249
250 ret = request_module("target_core_stgt");
251 if (ret != 0)
6708bb27 252 pr_err("Unable to load target_core_stgt\n");
c66ac9db
NB		 253
254 return 0;
255}
256
257int transport_subsystem_check_init(void)
258{
e3d6f909
AG		 259 int ret;
260
261 if (sub_api_initialized)
c66ac9db
NB		 262 return 0;
263 /*
264 * Request the loading of known TCM subsystem plugins..
265 */
e3d6f909
AG		 266 ret = transport_subsystem_reqmods();
267 if (ret < 0)
268 return ret;
c66ac9db 269
e3d6f909 270 sub_api_initialized = 1;
c66ac9db
NB		 271 return 0;
272}
273
274struct se_session *transport_init_session(void)
275{
276 struct se_session *se_sess;
277
278 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 279 if (!se_sess) {
280 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 281 " se_sess_cache\n");
282 return ERR_PTR(-ENOMEM);
283 }
284 INIT_LIST_HEAD(&se_sess->sess_list);
285 INIT_LIST_HEAD(&se_sess->sess_acl_list);
c66ac9db
NB		 286
287 return se_sess;
288}
289EXPORT_SYMBOL(transport_init_session);
290
291/*
292 * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
293 */
294void __transport_register_session(
295 struct se_portal_group *se_tpg,
296 struct se_node_acl *se_nacl,
297 struct se_session *se_sess,
298 void *fabric_sess_ptr)
299{
300 unsigned char buf[PR_REG_ISID_LEN];
301
302 se_sess->se_tpg = se_tpg;
303 se_sess->fabric_sess_ptr = fabric_sess_ptr;
304 /*
305 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
306 *
307 * Only set for struct se_session's that will actually be moving I/O.
308 * eg: *NOT* discovery sessions.
309 */
310 if (se_nacl) {
311 /*
312 * If the fabric module supports an ISID based TransportID,
313 * save this value in binary from the fabric I_T Nexus now.
314 */
e3d6f909 315 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 316 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 317 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 318 &buf[0], PR_REG_ISID_LEN);
319 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
320 }
321 spin_lock_irq(&se_nacl->nacl_sess_lock);
322 /*
323 * The se_nacl->nacl_sess pointer will be set to the
324 * last active I_T Nexus for each struct se_node_acl.
325 */
326 se_nacl->nacl_sess = se_sess;
327
328 list_add_tail(&se_sess->sess_acl_list,
329 &se_nacl->acl_sess_list);
330 spin_unlock_irq(&se_nacl->nacl_sess_lock);
331 }
332 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
333
6708bb27 334 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 335 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 336}
337EXPORT_SYMBOL(__transport_register_session);
338
339void transport_register_session(
340 struct se_portal_group *se_tpg,
341 struct se_node_acl *se_nacl,
342 struct se_session *se_sess,
343 void *fabric_sess_ptr)
344{
345 spin_lock_bh(&se_tpg->session_lock);
346 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
347 spin_unlock_bh(&se_tpg->session_lock);
348}
349EXPORT_SYMBOL(transport_register_session);
350
351void transport_deregister_session_configfs(struct se_session *se_sess)
352{
353 struct se_node_acl *se_nacl;
23388864 354 unsigned long flags;
c66ac9db
NB		 355 /*
356 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
357 */
358 se_nacl = se_sess->se_node_acl;
6708bb27 359 if (se_nacl) {
23388864 360 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 361 list_del(&se_sess->sess_acl_list);
362 /*
363 * If the session list is empty, then clear the pointer.
364 * Otherwise, set the struct se_session pointer from the tail
365 * element of the per struct se_node_acl active session list.
366 */
367 if (list_empty(&se_nacl->acl_sess_list))
368 se_nacl->nacl_sess = NULL;
369 else {
370 se_nacl->nacl_sess = container_of(
371 se_nacl->acl_sess_list.prev,
372 struct se_session, sess_acl_list);
373 }
23388864 374 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 375 }
376}
377EXPORT_SYMBOL(transport_deregister_session_configfs);
378
379void transport_free_session(struct se_session *se_sess)
380{
381 kmem_cache_free(se_sess_cache, se_sess);
382}
383EXPORT_SYMBOL(transport_free_session);
384
385void transport_deregister_session(struct se_session *se_sess)
386{
387 struct se_portal_group *se_tpg = se_sess->se_tpg;
388 struct se_node_acl *se_nacl;
e63a8e19 389 unsigned long flags;
c66ac9db 390
6708bb27 391 if (!se_tpg) {
c66ac9db
NB		 392 transport_free_session(se_sess);
393 return;
394 }
c66ac9db 395
e63a8e19 396 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 397 list_del(&se_sess->sess_list);
398 se_sess->se_tpg = NULL;
399 se_sess->fabric_sess_ptr = NULL;
e63a8e19 400 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 401
402 /*
403 * Determine if we need to do extra work for this initiator node's
404 * struct se_node_acl if it had been previously dynamically generated.
405 */
406 se_nacl = se_sess->se_node_acl;
6708bb27 407 if (se_nacl) {
e63a8e19 408 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 409 if (se_nacl->dynamic_node_acl) {
6708bb27
AG		 410 if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
411 se_tpg)) {
c66ac9db
NB		 412 list_del(&se_nacl->acl_list);
413 se_tpg->num_node_acls--;
e63a8e19 414 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 415
416 core_tpg_wait_for_nacl_pr_ref(se_nacl);
c66ac9db 417 core_free_device_list_for_node(se_nacl, se_tpg);
e3d6f909 418 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
c66ac9db 419 se_nacl);
e63a8e19 420 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 421 }
422 }
e63a8e19 423 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db
NB		 424 }
425
426 transport_free_session(se_sess);
427
6708bb27 428 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 429 se_tpg->se_tpg_tfo->get_fabric_name());
c66ac9db
NB		 430}
431EXPORT_SYMBOL(transport_deregister_session);
432
433/*
a1d8b49a 434 * Called with cmd->t_state_lock held.
c66ac9db
NB		 435 */
436static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
437{
438 struct se_device *dev;
439 struct se_task *task;
440 unsigned long flags;
441
a1d8b49a 442 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db 443 dev = task->se_dev;
6708bb27 444 if (!dev)
c66ac9db
NB		 445 continue;
446
447 if (atomic_read(&task->task_active))
448 continue;
449
6708bb27 450 if (!atomic_read(&task->task_state_active))
c66ac9db
NB		 451 continue;
452
453 spin_lock_irqsave(&dev->execute_task_lock, flags);
454 list_del(&task->t_state_list);
6708bb27
AG		 455 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
456 cmd->se_tfo->get_task_tag(cmd), dev, task);
c66ac9db
NB		 457 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
458
459 atomic_set(&task->task_state_active, 0);
a1d8b49a 460 atomic_dec(&cmd->t_task_cdbs_ex_left);
c66ac9db
NB		 461 }
462}
463
464/* transport_cmd_check_stop():
465 *
466 * 'transport_off = 1' determines if t_transport_active should be cleared.
467 * 'transport_off = 2' determines if task_dev_state should be removed.
468 *
469 * A non-zero u8 t_state sets cmd->t_state.
470 * Returns 1 when command is stopped, else 0.
471 */
472static int transport_cmd_check_stop(
473 struct se_cmd *cmd,
474 int transport_off,
475 u8 t_state)
476{
477 unsigned long flags;
478
a1d8b49a 479 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 480 /*
481 * Determine if IOCTL context caller in requesting the stopping of this
482 * command for LUN shutdown purposes.
483 */
a1d8b49a 484 if (atomic_read(&cmd->transport_lun_stop)) {
6708bb27 485 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
c66ac9db 486 " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 487 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 488
489 cmd->deferred_t_state = cmd->t_state;
490 cmd->t_state = TRANSPORT_DEFERRED_CMD;
a1d8b49a 491 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 492 if (transport_off == 2)
493 transport_all_task_dev_remove_state(cmd);
a1d8b49a 494 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 495
a1d8b49a 496 complete(&cmd->transport_lun_stop_comp);
c66ac9db
NB		 497 return 1;
498 }
499 /*
500 * Determine if frontend context caller is requesting the stopping of
e3d6f909 501 * this command for frontend exceptions.
c66ac9db 502 */
a1d8b49a 503 if (atomic_read(&cmd->t_transport_stop)) {
6708bb27 504 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
c66ac9db 505 " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
e3d6f909 506 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 507
508 cmd->deferred_t_state = cmd->t_state;
509 cmd->t_state = TRANSPORT_DEFERRED_CMD;
510 if (transport_off == 2)
511 transport_all_task_dev_remove_state(cmd);
512
513 /*
514 * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
515 * to FE.
516 */
517 if (transport_off == 2)
518 cmd->se_lun = NULL;
a1d8b49a 519 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 520
a1d8b49a 521 complete(&cmd->t_transport_stop_comp);
c66ac9db
NB		 522 return 1;
523 }
524 if (transport_off) {
a1d8b49a 525 atomic_set(&cmd->t_transport_active, 0);
c66ac9db
NB		 526 if (transport_off == 2) {
527 transport_all_task_dev_remove_state(cmd);
528 /*
529 * Clear struct se_cmd->se_lun before the transport_off == 2
530 * handoff to fabric module.
531 */
532 cmd->se_lun = NULL;
533 /*
534 * Some fabric modules like tcm_loop can release
25985edc 535 * their internally allocated I/O reference now and
c66ac9db
NB		 536 * struct se_cmd now.
537 */
e3d6f909 538 if (cmd->se_tfo->check_stop_free != NULL) {
c66ac9db 539 spin_unlock_irqrestore(
a1d8b49a 540 &cmd->t_state_lock, flags);
c66ac9db 541
e3d6f909 542 cmd->se_tfo->check_stop_free(cmd);
c66ac9db
NB		 543 return 1;
544 }
545 }
a1d8b49a 546 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 547
548 return 0;
549 } else if (t_state)
550 cmd->t_state = t_state;
a1d8b49a 551 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 552
553 return 0;
554}
555
556static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
557{
558 return transport_cmd_check_stop(cmd, 2, 0);
559}
560
561static void transport_lun_remove_cmd(struct se_cmd *cmd)
562{
e3d6f909 563 struct se_lun *lun = cmd->se_lun;
c66ac9db
NB		 564 unsigned long flags;
565
566 if (!lun)
567 return;
568
a1d8b49a 569 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 570 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 571 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 572 goto check_lun;
573 }
a1d8b49a 574 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 575 transport_all_task_dev_remove_state(cmd);
a1d8b49a 576 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 577
c66ac9db
NB		 578
579check_lun:
580 spin_lock_irqsave(&lun->lun_cmd_lock, flags);
a1d8b49a 581 if (atomic_read(&cmd->transport_lun_active)) {
5951146d 582 list_del(&cmd->se_lun_node);
a1d8b49a 583 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db 584#if 0
6708bb27 585 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
e3d6f909 586 cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
c66ac9db
NB		 587#endif
588 }
589 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
590}
591
592void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
593{
8dc52b54
NB		 594 if (!cmd->se_tmr_req)
595 transport_lun_remove_cmd(cmd);
c66ac9db
NB		 596
597 if (transport_cmd_check_stop_to_fabric(cmd))
598 return;
77039d1e
NB		 599 if (remove) {
600 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
e6a2573f 601 transport_put_cmd(cmd);
77039d1e 602 }
c66ac9db
NB		 603}
604
5951146d 605static void transport_add_cmd_to_queue(
c66ac9db
NB		 606 struct se_cmd *cmd,
607 int t_state)
608{
609 struct se_device *dev = cmd->se_dev;
e3d6f909 610 struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db
NB		 611 unsigned long flags;
612
c66ac9db 613 if (t_state) {
a1d8b49a 614 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 615 cmd->t_state = t_state;
a1d8b49a
AG		 616 atomic_set(&cmd->t_transport_active, 1);
617 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 618 }
619
620 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
79a7fef2
RD		 621
622 /* If the cmd is already on the list, remove it before we add it */
623 if (!list_empty(&cmd->se_queue_node))
624 list_del(&cmd->se_queue_node);
625 else
626 atomic_inc(&qobj->queue_cnt);
627
07bde79a
NB		 628 if (cmd->se_cmd_flags & SCF_EMULATE_QUEUE_FULL) {
629 cmd->se_cmd_flags &= ~SCF_EMULATE_QUEUE_FULL;
630 list_add(&cmd->se_queue_node, &qobj->qobj_list);
631 } else
632 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
79a7fef2 633 atomic_set(&cmd->t_transport_queue_active, 1);
c66ac9db
NB		 634 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
635
c66ac9db 636 wake_up_interruptible(&qobj->thread_wq);
c66ac9db
NB		 637}
638
5951146d
AG		 639static struct se_cmd *
640transport_get_cmd_from_queue(struct se_queue_obj *qobj)
c66ac9db 641{
5951146d 642 struct se_cmd *cmd;
c66ac9db
NB		 643 unsigned long flags;
644
645 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
646 if (list_empty(&qobj->qobj_list)) {
647 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
648 return NULL;
649 }
5951146d 650 cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
c66ac9db 651
79a7fef2 652 atomic_set(&cmd->t_transport_queue_active, 0);
c66ac9db 653
79a7fef2 654 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 655 atomic_dec(&qobj->queue_cnt);
656 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
657
5951146d 658 return cmd;
c66ac9db
NB		 659}
660
661static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
662 struct se_queue_obj *qobj)
663{
c66ac9db
NB		 664 unsigned long flags;
665
666 spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
6708bb27 667 if (!atomic_read(&cmd->t_transport_queue_active)) {
c66ac9db
NB		 668 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
669 return;
670 }
79a7fef2
RD		 671 atomic_set(&cmd->t_transport_queue_active, 0);
672 atomic_dec(&qobj->queue_cnt);
673 list_del_init(&cmd->se_queue_node);
c66ac9db
NB		 674 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
675
a1d8b49a 676 if (atomic_read(&cmd->t_transport_queue_active)) {
6708bb27 677 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
e3d6f909 678 cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 679 atomic_read(&cmd->t_transport_queue_active));
c66ac9db
NB		 680 }
681}
682
683/*
684 * Completion function used by TCM subsystem plugins (such as FILEIO)
685 * for queueing up response from struct se_subsystem_api->do_task()
686 */
687void transport_complete_sync_cache(struct se_cmd *cmd, int good)
688{
a1d8b49a 689 struct se_task *task = list_entry(cmd->t_task_list.next,
c66ac9db
NB		 690 struct se_task, t_list);
691
692 if (good) {
693 cmd->scsi_status = SAM_STAT_GOOD;
694 task->task_scsi_status = GOOD;
695 } else {
696 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
697 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
e3d6f909 698 task->task_se_cmd->transport_error_status =
c66ac9db
NB		 699 PYX_TRANSPORT_ILLEGAL_REQUEST;
700 }
701
702 transport_complete_task(task, good);
703}
704EXPORT_SYMBOL(transport_complete_sync_cache);
705
706/* transport_complete_task():
707 *
708 * Called from interrupt and non interrupt context depending
709 * on the transport plugin.
710 */
711void transport_complete_task(struct se_task *task, int success)
712{
e3d6f909 713 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db
NB		 714 struct se_device *dev = task->se_dev;
715 int t_state;
716 unsigned long flags;
717#if 0
6708bb27 718 pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
a1d8b49a 719 cmd->t_task_cdb[0], dev);
c66ac9db 720#endif
e3d6f909 721 if (dev)
c66ac9db 722 atomic_inc(&dev->depth_left);
c66ac9db 723
a1d8b49a 724 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 725 atomic_set(&task->task_active, 0);
726
727 /*
728 * See if any sense data exists, if so set the TASK_SENSE flag.
729 * Also check for any other post completion work that needs to be
730 * done by the plugins.
731 */
732 if (dev && dev->transport->transport_complete) {
733 if (dev->transport->transport_complete(task) != 0) {
734 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
735 task->task_sense = 1;
736 success = 1;
737 }
738 }
739
740 /*
741 * See if we are waiting for outstanding struct se_task
742 * to complete for an exception condition
743 */
744 if (atomic_read(&task->task_stop)) {
745 /*
a1d8b49a 746 * Decrement cmd->t_se_count if this task had
c66ac9db
NB		 747 * previously thrown its timeout exception handler.
748 */
749 if (atomic_read(&task->task_timeout)) {
a1d8b49a 750 atomic_dec(&cmd->t_se_count);
c66ac9db
NB		 751 atomic_set(&task->task_timeout, 0);
752 }
a1d8b49a 753 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 754
755 complete(&task->task_stop_comp);
756 return;
757 }
758 /*
759 * If the task's timeout handler has fired, use the t_task_cdbs_timeout
760 * left counter to determine when the struct se_cmd is ready to be queued to
761 * the processing thread.
762 */
763 if (atomic_read(&task->task_timeout)) {
6708bb27
AG		 764 if (!atomic_dec_and_test(
765 &cmd->t_task_cdbs_timeout_left)) {
a1d8b49a 766 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 767 flags);
768 return;
769 }
770 t_state = TRANSPORT_COMPLETE_TIMEOUT;
a1d8b49a 771 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 772
773 transport_add_cmd_to_queue(cmd, t_state);
774 return;
775 }
a1d8b49a 776 atomic_dec(&cmd->t_task_cdbs_timeout_left);
c66ac9db
NB		 777
778 /*
779 * Decrement the outstanding t_task_cdbs_left count. The last
780 * struct se_task from struct se_cmd will complete itself into the
781 * device queue depending upon int success.
782 */
6708bb27 783 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
c66ac9db 784 if (!success)
a1d8b49a 785 cmd->t_tasks_failed = 1;
c66ac9db 786
a1d8b49a 787 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 788 return;
789 }
790
a1d8b49a 791 if (!success || cmd->t_tasks_failed) {
c66ac9db
NB		 792 t_state = TRANSPORT_COMPLETE_FAILURE;
793 if (!task->task_error_status) {
794 task->task_error_status =
795 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
796 cmd->transport_error_status =
797 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
798 }
799 } else {
a1d8b49a 800 atomic_set(&cmd->t_transport_complete, 1);
c66ac9db
NB		 801 t_state = TRANSPORT_COMPLETE_OK;
802 }
a1d8b49a 803 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 804
805 transport_add_cmd_to_queue(cmd, t_state);
806}
807EXPORT_SYMBOL(transport_complete_task);
808
809/*
810 * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
811 * struct se_task list are ready to be added to the active execution list
812 * struct se_device
813
814 * Called with se_dev_t->execute_task_lock called.
815 */
816static inline int transport_add_task_check_sam_attr(
817 struct se_task *task,
818 struct se_task *task_prev,
819 struct se_device *dev)
820{
821 /*
822 * No SAM Task attribute emulation enabled, add to tail of
823 * execution queue
824 */
825 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
826 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
827 return 0;
828 }
829 /*
830 * HEAD_OF_QUEUE attribute for received CDB, which means
831 * the first task that is associated with a struct se_cmd goes to
832 * head of the struct se_device->execute_task_list, and task_prev
833 * after that for each subsequent task
834 */
e66ecd50 835 if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 836 list_add(&task->t_execute_list,
837 (task_prev != NULL) ?
838 &task_prev->t_execute_list :
839 &dev->execute_task_list);
840
6708bb27 841 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
c66ac9db 842 " in execution queue\n",
6708bb27 843 task->task_se_cmd->t_task_cdb[0]);
c66ac9db
NB		 844 return 1;
845 }
846 /*
847 * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
848 * transitioned from Dermant -> Active state, and are added to the end
849 * of the struct se_device->execute_task_list
850 */
851 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
852 return 0;
853}
854
855/* __transport_add_task_to_execute_queue():
856 *
857 * Called with se_dev_t->execute_task_lock called.
858 */
859static void __transport_add_task_to_execute_queue(
860 struct se_task *task,
861 struct se_task *task_prev,
862 struct se_device *dev)
863{
864 int head_of_queue;
865
866 head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
867 atomic_inc(&dev->execute_tasks);
868
869 if (atomic_read(&task->task_state_active))
870 return;
871 /*
872 * Determine if this task needs to go to HEAD_OF_QUEUE for the
873 * state list as well. Running with SAM Task Attribute emulation
874 * will always return head_of_queue == 0 here
875 */
876 if (head_of_queue)
877 list_add(&task->t_state_list, (task_prev) ?
878 &task_prev->t_state_list :
879 &dev->state_task_list);
880 else
881 list_add_tail(&task->t_state_list, &dev->state_task_list);
882
883 atomic_set(&task->task_state_active, 1);
884
6708bb27 885 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
e3d6f909 886 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
c66ac9db
NB		 887 task, dev);
888}
889
890static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
891{
892 struct se_device *dev;
893 struct se_task *task;
894 unsigned long flags;
895
a1d8b49a
AG		 896 spin_lock_irqsave(&cmd->t_state_lock, flags);
897 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 898 dev = task->se_dev;
899
900 if (atomic_read(&task->task_state_active))
901 continue;
902
903 spin_lock(&dev->execute_task_lock);
904 list_add_tail(&task->t_state_list, &dev->state_task_list);
905 atomic_set(&task->task_state_active, 1);
906
6708bb27
AG		 907 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
908 task->task_se_cmd->se_tfo->get_task_tag(
c66ac9db
NB		 909 task->task_se_cmd), task, dev);
910
911 spin_unlock(&dev->execute_task_lock);
912 }
a1d8b49a 913 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 914}
915
916static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
917{
5951146d 918 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 919 struct se_task *task, *task_prev = NULL;
920 unsigned long flags;
921
922 spin_lock_irqsave(&dev->execute_task_lock, flags);
a1d8b49a 923 list_for_each_entry(task, &cmd->t_task_list, t_list) {
c66ac9db
NB		 924 if (atomic_read(&task->task_execute_queue))
925 continue;
926 /*
927 * __transport_add_task_to_execute_queue() handles the
928 * SAM Task Attribute emulation if enabled
929 */
930 __transport_add_task_to_execute_queue(task, task_prev, dev);
931 atomic_set(&task->task_execute_queue, 1);
932 task_prev = task;
933 }
934 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 935}
936
937/* transport_remove_task_from_execute_queue():
938 *
939 *
940 */
52208ae3 941void transport_remove_task_from_execute_queue(
c66ac9db
NB		 942 struct se_task *task,
943 struct se_device *dev)
944{
945 unsigned long flags;
946
af57c3ac
NB		 947 if (atomic_read(&task->task_execute_queue) == 0) {
948 dump_stack();
949 return;
950 }
951
c66ac9db
NB		 952 spin_lock_irqsave(&dev->execute_task_lock, flags);
953 list_del(&task->t_execute_list);
af57c3ac 954 atomic_set(&task->task_execute_queue, 0);
c66ac9db
NB		 955 atomic_dec(&dev->execute_tasks);
956 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
957}
958
07bde79a
NB		 959/*
960 * Handle QUEUE_FULL / -EAGAIN status
961 */
962
963static void target_qf_do_work(struct work_struct *work)
964{
965 struct se_device *dev = container_of(work, struct se_device,
966 qf_work_queue);
bcac364a 967 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 968 struct se_cmd *cmd, *cmd_tmp;
969
970 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 971 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
972 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 973
bcac364a 974 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a
NB		 975 list_del(&cmd->se_qf_node);
976 atomic_dec(&dev->dev_qf_count);
977 smp_mb__after_atomic_dec();
07bde79a 978
6708bb27 979 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a
NB		 980 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
981 (cmd->t_state == TRANSPORT_COMPLETE_OK) ? "COMPLETE_OK" :
982 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
983 : "UNKNOWN");
984 /*
985 * The SCF_EMULATE_QUEUE_FULL flag will be cleared once se_cmd
986 * has been added to head of queue
987 */
988 transport_add_cmd_to_queue(cmd, cmd->t_state);
07bde79a 989 }
07bde79a
NB		 990}
991
c66ac9db
NB		 992unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
993{
994 switch (cmd->data_direction) {
995 case DMA_NONE:
996 return "NONE";
997 case DMA_FROM_DEVICE:
998 return "READ";
999 case DMA_TO_DEVICE:
1000 return "WRITE";
1001 case DMA_BIDIRECTIONAL:
1002 return "BIDI";
1003 default:
1004 break;
1005 }
1006
1007 return "UNKNOWN";
1008}
1009
1010void transport_dump_dev_state(
1011 struct se_device *dev,
1012 char *b,
1013 int *bl)
1014{
1015 *bl += sprintf(b + *bl, "Status: ");
1016 switch (dev->dev_status) {
1017 case TRANSPORT_DEVICE_ACTIVATED:
1018 *bl += sprintf(b + *bl, "ACTIVATED");
1019 break;
1020 case TRANSPORT_DEVICE_DEACTIVATED:
1021 *bl += sprintf(b + *bl, "DEACTIVATED");
1022 break;
1023 case TRANSPORT_DEVICE_SHUTDOWN:
1024 *bl += sprintf(b + *bl, "SHUTDOWN");
1025 break;
1026 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
1027 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
1028 *bl += sprintf(b + *bl, "OFFLINE");
1029 break;
1030 default:
1031 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
1032 break;
1033 }
1034
1035 *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
1036 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
1037 dev->queue_depth);
1038 *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
e3d6f909 1039 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db
NB		 1040 *bl += sprintf(b + *bl, " ");
1041}
1042
1043/* transport_release_all_cmds():
1044 *
1045 *
1046 */
1047static void transport_release_all_cmds(struct se_device *dev)
1048{
5951146d 1049 struct se_cmd *cmd, *tcmd;
c66ac9db
NB		 1050 int bug_out = 0, t_state;
1051 unsigned long flags;
1052
e3d6f909 1053 spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
5951146d
AG		 1054 list_for_each_entry_safe(cmd, tcmd, &dev->dev_queue_obj.qobj_list,
1055 se_queue_node) {
1056 t_state = cmd->t_state;
79a7fef2 1057 list_del_init(&cmd->se_queue_node);
e3d6f909 1058 spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock,
c66ac9db
NB		 1059 flags);
1060
6708bb27 1061 pr_err("Releasing ITT: 0x%08x, i_state: %u,"
c66ac9db 1062 " t_state: %u directly\n",
e3d6f909
AG		 1063 cmd->se_tfo->get_task_tag(cmd),
1064 cmd->se_tfo->get_cmd_state(cmd), t_state);
c66ac9db 1065
d3df7825 1066 transport_put_cmd(cmd);
c66ac9db
NB		 1067 bug_out = 1;
1068
e3d6f909 1069 spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
c66ac9db 1070 }
e3d6f909 1071 spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock, flags);
c66ac9db
NB		 1072#if 0
1073 if (bug_out)
1074 BUG();
1075#endif
1076}
1077
1078void transport_dump_vpd_proto_id(
1079 struct t10_vpd *vpd,
1080 unsigned char *p_buf,
1081 int p_buf_len)
1082{
1083 unsigned char buf[VPD_TMP_BUF_SIZE];
1084 int len;
1085
1086 memset(buf, 0, VPD_TMP_BUF_SIZE);
1087 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1088
1089 switch (vpd->protocol_identifier) {
1090 case 0x00:
1091 sprintf(buf+len, "Fibre Channel\n");
1092 break;
1093 case 0x10:
1094 sprintf(buf+len, "Parallel SCSI\n");
1095 break;
1096 case 0x20:
1097 sprintf(buf+len, "SSA\n");
1098 break;
1099 case 0x30:
1100 sprintf(buf+len, "IEEE 1394\n");
1101 break;
1102 case 0x40:
1103 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1104 " Protocol\n");
1105 break;
1106 case 0x50:
1107 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1108 break;
1109 case 0x60:
1110 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1111 break;
1112 case 0x70:
1113 sprintf(buf+len, "Automation/Drive Interface Transport"
1114 " Protocol\n");
1115 break;
1116 case 0x80:
1117 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1118 break;
1119 default:
1120 sprintf(buf+len, "Unknown 0x%02x\n",
1121 vpd->protocol_identifier);
1122 break;
1123 }
1124
1125 if (p_buf)
1126 strncpy(p_buf, buf, p_buf_len);
1127 else
6708bb27 1128 pr_debug("%s", buf);
c66ac9db
NB		 1129}
1130
1131void
1132transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1133{
1134 /*
1135 * Check if the Protocol Identifier Valid (PIV) bit is set..
1136 *
1137 * from spc3r23.pdf section 7.5.1
1138 */
1139 if (page_83[1] & 0x80) {
1140 vpd->protocol_identifier = (page_83[0] & 0xf0);
1141 vpd->protocol_identifier_set = 1;
1142 transport_dump_vpd_proto_id(vpd, NULL, 0);
1143 }
1144}
1145EXPORT_SYMBOL(transport_set_vpd_proto_id);
1146
1147int transport_dump_vpd_assoc(
1148 struct t10_vpd *vpd,
1149 unsigned char *p_buf,
1150 int p_buf_len)
1151{
1152 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1153 int ret = 0;
1154 int len;
c66ac9db
NB		 1155
1156 memset(buf, 0, VPD_TMP_BUF_SIZE);
1157 len = sprintf(buf, "T10 VPD Identifier Association: ");
1158
1159 switch (vpd->association) {
1160 case 0x00:
1161 sprintf(buf+len, "addressed logical unit\n");
1162 break;
1163 case 0x10:
1164 sprintf(buf+len, "target port\n");
1165 break;
1166 case 0x20:
1167 sprintf(buf+len, "SCSI target device\n");
1168 break;
1169 default:
1170 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 1171 ret = -EINVAL;
c66ac9db
NB		 1172 break;
1173 }
1174
1175 if (p_buf)
1176 strncpy(p_buf, buf, p_buf_len);
1177 else
6708bb27 1178 pr_debug("%s", buf);
c66ac9db
NB		 1179
1180 return ret;
1181}
1182
1183int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1184{
1185 /*
1186 * The VPD identification association..
1187 *
1188 * from spc3r23.pdf Section 7.6.3.1 Table 297
1189 */
1190 vpd->association = (page_83[1] & 0x30);
1191 return transport_dump_vpd_assoc(vpd, NULL, 0);
1192}
1193EXPORT_SYMBOL(transport_set_vpd_assoc);
1194
1195int transport_dump_vpd_ident_type(
1196 struct t10_vpd *vpd,
1197 unsigned char *p_buf,
1198 int p_buf_len)
1199{
1200 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 1201 int ret = 0;
1202 int len;
c66ac9db
NB		 1203
1204 memset(buf, 0, VPD_TMP_BUF_SIZE);
1205 len = sprintf(buf, "T10 VPD Identifier Type: ");
1206
1207 switch (vpd->device_identifier_type) {
1208 case 0x00:
1209 sprintf(buf+len, "Vendor specific\n");
1210 break;
1211 case 0x01:
1212 sprintf(buf+len, "T10 Vendor ID based\n");
1213 break;
1214 case 0x02:
1215 sprintf(buf+len, "EUI-64 based\n");
1216 break;
1217 case 0x03:
1218 sprintf(buf+len, "NAA\n");
1219 break;
1220 case 0x04:
1221 sprintf(buf+len, "Relative target port identifier\n");
1222 break;
1223 case 0x08:
1224 sprintf(buf+len, "SCSI name string\n");
1225 break;
1226 default:
1227 sprintf(buf+len, "Unsupported: 0x%02x\n",
1228 vpd->device_identifier_type);
e3d6f909 1229 ret = -EINVAL;
c66ac9db
NB		 1230 break;
1231 }
1232
e3d6f909
AG		 1233 if (p_buf) {
1234 if (p_buf_len < strlen(buf)+1)
1235 return -EINVAL;
c66ac9db 1236 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1237 } else {
6708bb27 1238 pr_debug("%s", buf);
e3d6f909 1239 }
c66ac9db
NB		 1240
1241 return ret;
1242}
1243
1244int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1245{
1246 /*
1247 * The VPD identifier type..
1248 *
1249 * from spc3r23.pdf Section 7.6.3.1 Table 298
1250 */
1251 vpd->device_identifier_type = (page_83[1] & 0x0f);
1252 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1253}
1254EXPORT_SYMBOL(transport_set_vpd_ident_type);
1255
1256int transport_dump_vpd_ident(
1257 struct t10_vpd *vpd,
1258 unsigned char *p_buf,
1259 int p_buf_len)
1260{
1261 unsigned char buf[VPD_TMP_BUF_SIZE];
1262 int ret = 0;
1263
1264 memset(buf, 0, VPD_TMP_BUF_SIZE);
1265
1266 switch (vpd->device_identifier_code_set) {
1267 case 0x01: /* Binary */
1268 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1269 &vpd->device_identifier[0]);
1270 break;
1271 case 0x02: /* ASCII */
1272 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1273 &vpd->device_identifier[0]);
1274 break;
1275 case 0x03: /* UTF-8 */
1276 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1277 &vpd->device_identifier[0]);
1278 break;
1279 default:
1280 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1281 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1282 ret = -EINVAL;
c66ac9db
NB		 1283 break;
1284 }
1285
1286 if (p_buf)
1287 strncpy(p_buf, buf, p_buf_len);
1288 else
6708bb27 1289 pr_debug("%s", buf);
c66ac9db
NB		 1290
1291 return ret;
1292}
1293
1294int
1295transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1296{
1297 static const char hex_str[] = "0123456789abcdef";
1298 int j = 0, i = 4; /* offset to start of the identifer */
1299
1300 /*
1301 * The VPD Code Set (encoding)
1302 *
1303 * from spc3r23.pdf Section 7.6.3.1 Table 296
1304 */
1305 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1306 switch (vpd->device_identifier_code_set) {
1307 case 0x01: /* Binary */
1308 vpd->device_identifier[j++] =
1309 hex_str[vpd->device_identifier_type];
1310 while (i < (4 + page_83[3])) {
1311 vpd->device_identifier[j++] =
1312 hex_str[(page_83[i] & 0xf0) >> 4];
1313 vpd->device_identifier[j++] =
1314 hex_str[page_83[i] & 0x0f];
1315 i++;
1316 }
1317 break;
1318 case 0x02: /* ASCII */
1319 case 0x03: /* UTF-8 */
1320 while (i < (4 + page_83[3]))
1321 vpd->device_identifier[j++] = page_83[i++];
1322 break;
1323 default:
1324 break;
1325 }
1326
1327 return transport_dump_vpd_ident(vpd, NULL, 0);
1328}
1329EXPORT_SYMBOL(transport_set_vpd_ident);
1330
1331static void core_setup_task_attr_emulation(struct se_device *dev)
1332{
1333 /*
1334 * If this device is from Target_Core_Mod/pSCSI, disable the
1335 * SAM Task Attribute emulation.
1336 *
1337 * This is currently not available in upsream Linux/SCSI Target
1338 * mode code, and is assumed to be disabled while using TCM/pSCSI.
1339 */
e3d6f909 1340 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
c66ac9db
NB		 1341 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1342 return;
1343 }
1344
1345 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
6708bb27 1346 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
e3d6f909
AG		 1347 " device\n", dev->transport->name,
1348 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1349}
1350
1351static void scsi_dump_inquiry(struct se_device *dev)
1352{
e3d6f909 1353 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
c66ac9db
NB		 1354 int i, device_type;
1355 /*
1356 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1357 */
6708bb27 1358 pr_debug(" Vendor: ");
c66ac9db
NB		 1359 for (i = 0; i < 8; i++)
1360 if (wwn->vendor[i] >= 0x20)
6708bb27 1361 pr_debug("%c", wwn->vendor[i]);
c66ac9db 1362 else
6708bb27 1363 pr_debug(" ");
c66ac9db 1364
6708bb27 1365 pr_debug(" Model: ");
c66ac9db
NB		 1366 for (i = 0; i < 16; i++)
1367 if (wwn->model[i] >= 0x20)
6708bb27 1368 pr_debug("%c", wwn->model[i]);
c66ac9db 1369 else
6708bb27 1370 pr_debug(" ");
c66ac9db 1371
6708bb27 1372 pr_debug(" Revision: ");
c66ac9db
NB		 1373 for (i = 0; i < 4; i++)
1374 if (wwn->revision[i] >= 0x20)
6708bb27 1375 pr_debug("%c", wwn->revision[i]);
c66ac9db 1376 else
6708bb27 1377 pr_debug(" ");
c66ac9db 1378
6708bb27 1379 pr_debug("\n");
c66ac9db 1380
e3d6f909 1381 device_type = dev->transport->get_device_type(dev);
6708bb27
AG		 1382 pr_debug(" Type: %s ", scsi_device_type(device_type));
1383 pr_debug(" ANSI SCSI revision: %02x\n",
e3d6f909 1384 dev->transport->get_device_rev(dev));
c66ac9db
NB		 1385}
1386
1387struct se_device *transport_add_device_to_core_hba(
1388 struct se_hba *hba,
1389 struct se_subsystem_api *transport,
1390 struct se_subsystem_dev *se_dev,
1391 u32 device_flags,
1392 void *transport_dev,
1393 struct se_dev_limits *dev_limits,
1394 const char *inquiry_prod,
1395 const char *inquiry_rev)
1396{
12a18bdc 1397 int force_pt;
c66ac9db
NB		 1398 struct se_device *dev;
1399
1400 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
6708bb27
AG		 1401 if (!dev) {
1402 pr_err("Unable to allocate memory for se_dev_t\n");
c66ac9db
NB		 1403 return NULL;
1404 }
c66ac9db 1405
e3d6f909 1406 transport_init_queue_obj(&dev->dev_queue_obj);
c66ac9db
NB		 1407 dev->dev_flags = device_flags;
1408 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
5951146d 1409 dev->dev_ptr = transport_dev;
c66ac9db
NB		 1410 dev->se_hba = hba;
1411 dev->se_sub_dev = se_dev;
1412 dev->transport = transport;
1413 atomic_set(&dev->active_cmds, 0);
1414 INIT_LIST_HEAD(&dev->dev_list);
1415 INIT_LIST_HEAD(&dev->dev_sep_list);
1416 INIT_LIST_HEAD(&dev->dev_tmr_list);
1417 INIT_LIST_HEAD(&dev->execute_task_list);
1418 INIT_LIST_HEAD(&dev->delayed_cmd_list);
1419 INIT_LIST_HEAD(&dev->ordered_cmd_list);
1420 INIT_LIST_HEAD(&dev->state_task_list);
07bde79a 1421 INIT_LIST_HEAD(&dev->qf_cmd_list);
c66ac9db
NB		 1422 spin_lock_init(&dev->execute_task_lock);
1423 spin_lock_init(&dev->delayed_cmd_lock);
1424 spin_lock_init(&dev->ordered_cmd_lock);
1425 spin_lock_init(&dev->state_task_lock);
1426 spin_lock_init(&dev->dev_alua_lock);
1427 spin_lock_init(&dev->dev_reservation_lock);
1428 spin_lock_init(&dev->dev_status_lock);
1429 spin_lock_init(&dev->dev_status_thr_lock);
1430 spin_lock_init(&dev->se_port_lock);
1431 spin_lock_init(&dev->se_tmr_lock);
07bde79a 1432 spin_lock_init(&dev->qf_cmd_lock);
c66ac9db
NB		 1433
1434 dev->queue_depth = dev_limits->queue_depth;
1435 atomic_set(&dev->depth_left, dev->queue_depth);
1436 atomic_set(&dev->dev_ordered_id, 0);
1437
1438 se_dev_set_default_attribs(dev, dev_limits);
1439
1440 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1441 dev->creation_time = get_jiffies_64();
1442 spin_lock_init(&dev->stats_lock);
1443
1444 spin_lock(&hba->device_lock);
1445 list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1446 hba->dev_count++;
1447 spin_unlock(&hba->device_lock);
1448 /*
1449 * Setup the SAM Task Attribute emulation for struct se_device
1450 */
1451 core_setup_task_attr_emulation(dev);
1452 /*
1453 * Force PR and ALUA passthrough emulation with internal object use.
1454 */
1455 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1456 /*
1457 * Setup the Reservations infrastructure for struct se_device
1458 */
1459 core_setup_reservations(dev, force_pt);
1460 /*
1461 * Setup the Asymmetric Logical Unit Assignment for struct se_device
1462 */
1463 if (core_setup_alua(dev, force_pt) < 0)
1464 goto out;
1465
1466 /*
1467 * Startup the struct se_device processing thread
1468 */
1469 dev->process_thread = kthread_run(transport_processing_thread, dev,
e3d6f909 1470 "LIO_%s", dev->transport->name);
c66ac9db 1471 if (IS_ERR(dev->process_thread)) {
6708bb27 1472 pr_err("Unable to create kthread: LIO_%s\n",
e3d6f909 1473 dev->transport->name);
c66ac9db
NB		 1474 goto out;
1475 }
07bde79a
NB		 1476 /*
1477 * Setup work_queue for QUEUE_FULL
1478 */
1479 INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
c66ac9db
NB		 1480 /*
1481 * Preload the initial INQUIRY const values if we are doing
1482 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1483 * passthrough because this is being provided by the backend LLD.
1484 * This is required so that transport_get_inquiry() copies these
1485 * originals once back into DEV_T10_WWN(dev) for the virtual device
1486 * setup.
1487 */
e3d6f909 1488 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
f22c1196 1489 if (!inquiry_prod || !inquiry_rev) {
6708bb27 1490 pr_err("All non TCM/pSCSI plugins require"
c66ac9db
NB		 1491 " INQUIRY consts\n");
1492 goto out;
1493 }
1494
e3d6f909
AG		 1495 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1496 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1497 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
c66ac9db
NB		 1498 }
1499 scsi_dump_inquiry(dev);
1500
12a18bdc 1501 return dev;
c66ac9db 1502out:
c66ac9db
NB		 1503 kthread_stop(dev->process_thread);
1504
1505 spin_lock(&hba->device_lock);
1506 list_del(&dev->dev_list);
1507 hba->dev_count--;
1508 spin_unlock(&hba->device_lock);
1509
1510 se_release_vpd_for_dev(dev);
1511
c66ac9db
NB		 1512 kfree(dev);
1513
1514 return NULL;
1515}
1516EXPORT_SYMBOL(transport_add_device_to_core_hba);
1517
1518/* transport_generic_prepare_cdb():
1519 *
1520 * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
1521 * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1522 * The point of this is since we are mapping iSCSI LUNs to
1523 * SCSI Target IDs having a non-zero LUN in the CDB will throw the
1524 * devices and HBAs for a loop.
1525 */
1526static inline void transport_generic_prepare_cdb(
1527 unsigned char *cdb)
1528{
1529 switch (cdb[0]) {
1530 case READ_10: /* SBC - RDProtect */
1531 case READ_12: /* SBC - RDProtect */
1532 case READ_16: /* SBC - RDProtect */
1533 case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1534 case VERIFY: /* SBC - VRProtect */
1535 case VERIFY_16: /* SBC - VRProtect */
1536 case WRITE_VERIFY: /* SBC - VRProtect */
1537 case WRITE_VERIFY_12: /* SBC - VRProtect */
1538 break;
1539 default:
1540 cdb[1] &= 0x1f; /* clear logical unit number */
1541 break;
1542 }
1543}
1544
1545static struct se_task *
1546transport_generic_get_task(struct se_cmd *cmd,
1547 enum dma_data_direction data_direction)
1548{
1549 struct se_task *task;
5951146d 1550 struct se_device *dev = cmd->se_dev;
c66ac9db 1551
6708bb27 1552 task = dev->transport->alloc_task(cmd->t_task_cdb);
c66ac9db 1553 if (!task) {
6708bb27 1554 pr_err("Unable to allocate struct se_task\n");
c66ac9db
NB		 1555 return NULL;
1556 }
1557
1558 INIT_LIST_HEAD(&task->t_list);
1559 INIT_LIST_HEAD(&task->t_execute_list);
1560 INIT_LIST_HEAD(&task->t_state_list);
1561 init_completion(&task->task_stop_comp);
c66ac9db
NB		 1562 task->task_se_cmd = cmd;
1563 task->se_dev = dev;
1564 task->task_data_direction = data_direction;
1565
c66ac9db
NB		 1566 return task;
1567}
1568
1569static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1570
c66ac9db
NB		 1571/*
1572 * Used by fabric modules containing a local struct se_cmd within their
1573 * fabric dependent per I/O descriptor.
1574 */
1575void transport_init_se_cmd(
1576 struct se_cmd *cmd,
1577 struct target_core_fabric_ops *tfo,
1578 struct se_session *se_sess,
1579 u32 data_length,
1580 int data_direction,
1581 int task_attr,
1582 unsigned char *sense_buffer)
1583{
5951146d
AG		 1584 INIT_LIST_HEAD(&cmd->se_lun_node);
1585 INIT_LIST_HEAD(&cmd->se_delayed_node);
1586 INIT_LIST_HEAD(&cmd->se_ordered_node);
07bde79a 1587 INIT_LIST_HEAD(&cmd->se_qf_node);
79a7fef2 1588 INIT_LIST_HEAD(&cmd->se_queue_node);
c66ac9db 1589
a1d8b49a
AG		 1590 INIT_LIST_HEAD(&cmd->t_task_list);
1591 init_completion(&cmd->transport_lun_fe_stop_comp);
1592 init_completion(&cmd->transport_lun_stop_comp);
1593 init_completion(&cmd->t_transport_stop_comp);
1594 spin_lock_init(&cmd->t_state_lock);
1595 atomic_set(&cmd->transport_dev_active, 1);
c66ac9db
NB		 1596
1597 cmd->se_tfo = tfo;
1598 cmd->se_sess = se_sess;
1599 cmd->data_length = data_length;
1600 cmd->data_direction = data_direction;
1601 cmd->sam_task_attr = task_attr;
1602 cmd->sense_buffer = sense_buffer;
1603}
1604EXPORT_SYMBOL(transport_init_se_cmd);
1605
1606static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1607{
1608 /*
1609 * Check if SAM Task Attribute emulation is enabled for this
1610 * struct se_device storage object
1611 */
5951146d 1612 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 1613 return 0;
1614
e66ecd50 1615 if (cmd->sam_task_attr == MSG_ACA_TAG) {
6708bb27 1616 pr_debug("SAM Task Attribute ACA"
c66ac9db 1617 " emulation is not supported\n");
e3d6f909 1618 return -EINVAL;
c66ac9db
NB		 1619 }
1620 /*
1621 * Used to determine when ORDERED commands should go from
1622 * Dormant to Active status.
1623 */
5951146d 1624 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
c66ac9db 1625 smp_mb__after_atomic_inc();
6708bb27 1626 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1627 cmd->se_ordered_id, cmd->sam_task_attr,
6708bb27 1628 cmd->se_dev->transport->name);
c66ac9db
NB		 1629 return 0;
1630}
1631
c66ac9db
NB		 1632/* transport_generic_allocate_tasks():
1633 *
1634 * Called from fabric RX Thread.
1635 */
1636int transport_generic_allocate_tasks(
1637 struct se_cmd *cmd,
1638 unsigned char *cdb)
1639{
1640 int ret;
1641
1642 transport_generic_prepare_cdb(cdb);
c66ac9db
NB		 1643 /*
1644 * Ensure that the received CDB is less than the max (252 + 8) bytes
1645 * for VARIABLE_LENGTH_CMD
1646 */
1647 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1648 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1649 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1650 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
e3d6f909 1651 return -EINVAL;
c66ac9db
NB		 1652 }
1653 /*
1654 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1655 * allocate the additional extended CDB buffer now.. Otherwise
1656 * setup the pointer from __t_task_cdb to t_task_cdb.
1657 */
a1d8b49a
AG		 1658 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1659 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1660 GFP_KERNEL);
6708bb27
AG		 1661 if (!cmd->t_task_cdb) {
1662 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1663 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1664 scsi_command_size(cdb),
a1d8b49a 1665 (unsigned long)sizeof(cmd->__t_task_cdb));
e3d6f909 1666 return -ENOMEM;
c66ac9db
NB		 1667 }
1668 } else
a1d8b49a 1669 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1670 /*
a1d8b49a 1671 * Copy the original CDB into cmd->
c66ac9db 1672 */
a1d8b49a 1673 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
c66ac9db
NB		 1674 /*
1675 * Setup the received CDB based on SCSI defined opcodes and
1676 * perform unit attention, persistent reservations and ALUA
a1d8b49a 1677 * checks for virtual device backends. The cmd->t_task_cdb
c66ac9db
NB		 1678 * pointer is expected to be setup before we reach this point.
1679 */
1680 ret = transport_generic_cmd_sequencer(cmd, cdb);
1681 if (ret < 0)
1682 return ret;
1683 /*
1684 * Check for SAM Task Attribute Emulation
1685 */
1686 if (transport_check_alloc_task_attr(cmd) < 0) {
1687 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1688 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 1689 return -EINVAL;
c66ac9db
NB		 1690 }
1691 spin_lock(&cmd->se_lun->lun_sep_lock);
1692 if (cmd->se_lun->lun_sep)
1693 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1694 spin_unlock(&cmd->se_lun->lun_sep_lock);
1695 return 0;
1696}
1697EXPORT_SYMBOL(transport_generic_allocate_tasks);
1698
dd8ae59d
NB		 1699static void transport_generic_request_failure(struct se_cmd *,
1700 struct se_device *, int, int);
695434e1
NB		 1701/*
1702 * Used by fabric module frontends to queue tasks directly.
1703 * Many only be used from process context only
1704 */
1705int transport_handle_cdb_direct(
1706 struct se_cmd *cmd)
1707{
dd8ae59d
NB		 1708 int ret;
1709
695434e1
NB		 1710 if (!cmd->se_lun) {
1711 dump_stack();
6708bb27 1712 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1713 return -EINVAL;
1714 }
1715 if (in_interrupt()) {
1716 dump_stack();
6708bb27 1717 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1718 " from interrupt context\n");
1719 return -EINVAL;
1720 }
dd8ae59d
NB		 1721 /*
1722 * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1723 * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1724 * in existing usage to ensure that outstanding descriptors are handled
d14921d6 1725 * correctly during shutdown via transport_wait_for_tasks()
dd8ae59d
NB		 1726 *
1727 * Also, we don't take cmd->t_state_lock here as we only expect
1728 * this to be called for initial descriptor submission.
1729 */
1730 cmd->t_state = TRANSPORT_NEW_CMD;
1731 atomic_set(&cmd->t_transport_active, 1);
1732 /*
1733 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1734 * so follow TRANSPORT_NEW_CMD processing thread context usage
1735 * and call transport_generic_request_failure() if necessary..
1736 */
1737 ret = transport_generic_new_cmd(cmd);
1738 if (ret == -EAGAIN)
1739 return 0;
1740 else if (ret < 0) {
1741 cmd->transport_error_status = ret;
1742 transport_generic_request_failure(cmd, NULL, 0,
1743 (cmd->data_direction != DMA_TO_DEVICE));
1744 }
1745 return 0;
695434e1
NB		 1746}
1747EXPORT_SYMBOL(transport_handle_cdb_direct);
1748
c66ac9db
NB		 1749/*
1750 * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1751 * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1752 * complete setup in TCM process context w/ TFO->new_cmd_map().
1753 */
1754int transport_generic_handle_cdb_map(
1755 struct se_cmd *cmd)
1756{
e3d6f909 1757 if (!cmd->se_lun) {
c66ac9db 1758 dump_stack();
6708bb27 1759 pr_err("cmd->se_lun is NULL\n");
e3d6f909 1760 return -EINVAL;
c66ac9db
NB		 1761 }
1762
1763 transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP);
1764 return 0;
1765}
1766EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1767
1768/* transport_generic_handle_data():
1769 *
1770 *
1771 */
1772int transport_generic_handle_data(
1773 struct se_cmd *cmd)
1774{
1775 /*
1776 * For the software fabric case, then we assume the nexus is being
1777 * failed/shutdown when signals are pending from the kthread context
1778 * caller, so we return a failure. For the HW target mode case running
1779 * in interrupt code, the signal_pending() check is skipped.
1780 */
1781 if (!in_interrupt() && signal_pending(current))
e3d6f909 1782 return -EPERM;
c66ac9db
NB		 1783 /*
1784 * If the received CDB has aleady been ABORTED by the generic
1785 * target engine, we now call transport_check_aborted_status()
1786 * to queue any delated TASK_ABORTED status for the received CDB to the
25985edc 1787 * fabric module as we are expecting no further incoming DATA OUT
c66ac9db
NB		 1788 * sequences at this point.
1789 */
1790 if (transport_check_aborted_status(cmd, 1) != 0)
1791 return 0;
1792
1793 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE);
1794 return 0;
1795}
1796EXPORT_SYMBOL(transport_generic_handle_data);
1797
1798/* transport_generic_handle_tmr():
1799 *
1800 *
1801 */
1802int transport_generic_handle_tmr(
1803 struct se_cmd *cmd)
1804{
c66ac9db
NB		 1805 transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR);
1806 return 0;
1807}
1808EXPORT_SYMBOL(transport_generic_handle_tmr);
1809
f4366772
NB		 1810void transport_generic_free_cmd_intr(
1811 struct se_cmd *cmd)
1812{
1813 transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR);
1814}
1815EXPORT_SYMBOL(transport_generic_free_cmd_intr);
1816
c66ac9db
NB		 1817static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1818{
1819 struct se_task *task, *task_tmp;
1820 unsigned long flags;
1821 int ret = 0;
1822
6708bb27 1823 pr_debug("ITT[0x%08x] - Stopping tasks\n",
e3d6f909 1824 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 1825
1826 /*
1827 * No tasks remain in the execution queue
1828 */
a1d8b49a 1829 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 1830 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 1831 &cmd->t_task_list, t_list) {
6708bb27 1832 pr_debug("task_no[%d] - Processing task %p\n",
c66ac9db
NB		 1833 task->task_no, task);
1834 /*
1835 * If the struct se_task has not been sent and is not active,
1836 * remove the struct se_task from the execution queue.
1837 */
1838 if (!atomic_read(&task->task_sent) &&
1839 !atomic_read(&task->task_active)) {
a1d8b49a 1840 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1841 flags);
1842 transport_remove_task_from_execute_queue(task,
1843 task->se_dev);
1844
6708bb27 1845 pr_debug("task_no[%d] - Removed from execute queue\n",
c66ac9db 1846 task->task_no);
a1d8b49a 1847 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 1848 continue;
1849 }
1850
1851 /*
1852 * If the struct se_task is active, sleep until it is returned
1853 * from the plugin.
1854 */
1855 if (atomic_read(&task->task_active)) {
1856 atomic_set(&task->task_stop, 1);
a1d8b49a 1857 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 1858 flags);
1859
6708bb27 1860 pr_debug("task_no[%d] - Waiting to complete\n",
c66ac9db
NB		 1861 task->task_no);
1862 wait_for_completion(&task->task_stop_comp);
6708bb27 1863 pr_debug("task_no[%d] - Stopped successfully\n",
c66ac9db
NB		 1864 task->task_no);
1865
a1d8b49a
AG		 1866 spin_lock_irqsave(&cmd->t_state_lock, flags);
1867 atomic_dec(&cmd->t_task_cdbs_left);
c66ac9db
NB		 1868
1869 atomic_set(&task->task_active, 0);
1870 atomic_set(&task->task_stop, 0);
1871 } else {
6708bb27 1872 pr_debug("task_no[%d] - Did nothing\n", task->task_no);
c66ac9db
NB		 1873 ret++;
1874 }
1875
1876 __transport_stop_task_timer(task, &flags);
1877 }
a1d8b49a 1878 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 1879
1880 return ret;
1881}
1882
c66ac9db
NB		 1883/*
1884 * Handle SAM-esque emulation for generic transport request failures.
1885 */
1886static void transport_generic_request_failure(
1887 struct se_cmd *cmd,
1888 struct se_device *dev,
1889 int complete,
1890 int sc)
1891{
07bde79a
NB		 1892 int ret = 0;
1893
6708bb27 1894 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1895 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1896 cmd->t_task_cdb[0]);
6708bb27 1897 pr_debug("-----[ i_state: %d t_state/def_t_state:"
c66ac9db 1898 " %d/%d transport_error_status: %d\n",
e3d6f909 1899 cmd->se_tfo->get_cmd_state(cmd),
c66ac9db
NB		 1900 cmd->t_state, cmd->deferred_t_state,
1901 cmd->transport_error_status);
6708bb27 1902 pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
c66ac9db
NB		 1903 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1904 " t_transport_active: %d t_transport_stop: %d"
6708bb27 1905 " t_transport_sent: %d\n", cmd->t_task_list_num,
a1d8b49a
AG		 1906 atomic_read(&cmd->t_task_cdbs_left),
1907 atomic_read(&cmd->t_task_cdbs_sent),
1908 atomic_read(&cmd->t_task_cdbs_ex_left),
1909 atomic_read(&cmd->t_transport_active),
1910 atomic_read(&cmd->t_transport_stop),
1911 atomic_read(&cmd->t_transport_sent));
c66ac9db
NB		 1912
1913 transport_stop_all_task_timers(cmd);
1914
1915 if (dev)
e3d6f909 1916 atomic_inc(&dev->depth_left);
c66ac9db
NB		 1917 /*
1918 * For SAM Task Attribute emulation for failed struct se_cmd
1919 */
1920 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1921 transport_complete_task_attr(cmd);
1922
1923 if (complete) {
1924 transport_direct_request_timeout(cmd);
1925 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
1926 }
1927
1928 switch (cmd->transport_error_status) {
1929 case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
1930 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1931 break;
1932 case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
1933 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
1934 break;
1935 case PYX_TRANSPORT_INVALID_CDB_FIELD:
1936 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1937 break;
1938 case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
1939 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1940 break;
1941 case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
1942 if (!sc)
1943 transport_new_cmd_failure(cmd);
1944 /*
1945 * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1946 * we force this session to fall back to session
1947 * recovery.
1948 */
e3d6f909
AG		 1949 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
1950 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
c66ac9db
NB		 1951
1952 goto check_stop;
1953 case PYX_TRANSPORT_LU_COMM_FAILURE:
1954 case PYX_TRANSPORT_ILLEGAL_REQUEST:
1955 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1956 break;
1957 case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
1958 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
1959 break;
1960 case PYX_TRANSPORT_WRITE_PROTECTED:
1961 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
1962 break;
1963 case PYX_TRANSPORT_RESERVATION_CONFLICT:
1964 /*
1965 * No SENSE Data payload for this case, set SCSI Status
1966 * and queue the response to $FABRIC_MOD.
1967 *
1968 * Uses linux/include/scsi/scsi.h SAM status codes defs
1969 */
1970 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1971 /*
1972 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1973 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1974 * CONFLICT STATUS.
1975 *
1976 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1977 */
e3d6f909
AG		 1978 if (cmd->se_sess &&
1979 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1980 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1981 cmd->orig_fe_lun, 0x2C,
1982 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1983
07bde79a
NB		 1984 ret = cmd->se_tfo->queue_status(cmd);
1985 if (ret == -EAGAIN)
1986 goto queue_full;
c66ac9db
NB		 1987 goto check_stop;
1988 case PYX_TRANSPORT_USE_SENSE_REASON:
1989 /*
1990 * struct se_cmd->scsi_sense_reason already set
1991 */
1992 break;
1993 default:
6708bb27 1994 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
a1d8b49a 1995 cmd->t_task_cdb[0],
c66ac9db
NB		 1996 cmd->transport_error_status);
1997 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1998 break;
1999 }
16ab8e60
NB		 2000 /*
2001 * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
2002 * make the call to transport_send_check_condition_and_sense()
2003 * directly. Otherwise expect the fabric to make the call to
2004 * transport_send_check_condition_and_sense() after handling
2005 * possible unsoliticied write data payloads.
2006 */
2007 if (!sc && !cmd->se_tfo->new_cmd_map)
c66ac9db 2008 transport_new_cmd_failure(cmd);
07bde79a
NB		 2009 else {
2010 ret = transport_send_check_condition_and_sense(cmd,
2011 cmd->scsi_sense_reason, 0);
2012 if (ret == -EAGAIN)
2013 goto queue_full;
2014 }
2015
c66ac9db
NB		 2016check_stop:
2017 transport_lun_remove_cmd(cmd);
6708bb27 2018 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 2019 ;
07bde79a
NB		 2020 return;
2021
2022queue_full:
2023 cmd->t_state = TRANSPORT_COMPLETE_OK;
2024 transport_handle_queue_full(cmd, cmd->se_dev, transport_complete_qf);
c66ac9db
NB		 2025}
2026
2027static void transport_direct_request_timeout(struct se_cmd *cmd)
2028{
2029 unsigned long flags;
2030
a1d8b49a 2031 spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27 2032 if (!atomic_read(&cmd->t_transport_timeout)) {
a1d8b49a 2033 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2034 return;
2035 }
a1d8b49a
AG		 2036 if (atomic_read(&cmd->t_task_cdbs_timeout_left)) {
2037 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2038 return;
2039 }
2040
a1d8b49a
AG		 2041 atomic_sub(atomic_read(&cmd->t_transport_timeout),
2042 &cmd->t_se_count);
2043 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2044}
2045
2046static void transport_generic_request_timeout(struct se_cmd *cmd)
2047{
2048 unsigned long flags;
2049
2050 /*
e6a2573f 2051 * Reset cmd->t_se_count to allow transport_put_cmd()
c66ac9db
NB		 2052 * to allow last call to free memory resources.
2053 */
a1d8b49a
AG		 2054 spin_lock_irqsave(&cmd->t_state_lock, flags);
2055 if (atomic_read(&cmd->t_transport_timeout) > 1) {
2056 int tmp = (atomic_read(&cmd->t_transport_timeout) - 1);
c66ac9db 2057
a1d8b49a 2058 atomic_sub(tmp, &cmd->t_se_count);
c66ac9db 2059 }
a1d8b49a 2060 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2061
e6a2573f 2062 transport_put_cmd(cmd);
c66ac9db
NB		 2063}
2064
c66ac9db
NB		 2065static inline u32 transport_lba_21(unsigned char *cdb)
2066{
2067 return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2068}
2069
2070static inline u32 transport_lba_32(unsigned char *cdb)
2071{
2072 return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2073}
2074
2075static inline unsigned long long transport_lba_64(unsigned char *cdb)
2076{
2077 unsigned int __v1, __v2;
2078
2079 __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2080 __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2081
2082 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2083}
2084
2085/*
2086 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2087 */
2088static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2089{
2090 unsigned int __v1, __v2;
2091
2092 __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2093 __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2094
2095 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2096}
2097
2098static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2099{
2100 unsigned long flags;
2101
a1d8b49a 2102 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db 2103 se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
a1d8b49a 2104 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2105}
2106
2107/*
2108 * Called from interrupt context.
2109 */
2110static void transport_task_timeout_handler(unsigned long data)
2111{
2112 struct se_task *task = (struct se_task *)data;
e3d6f909 2113 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db
NB		 2114 unsigned long flags;
2115
6708bb27 2116 pr_debug("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
c66ac9db 2117
a1d8b49a 2118 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2119 if (task->task_flags & TF_STOP) {
a1d8b49a 2120 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2121 return;
2122 }
2123 task->task_flags &= ~TF_RUNNING;
2124
2125 /*
2126 * Determine if transport_complete_task() has already been called.
2127 */
6708bb27
AG		 2128 if (!atomic_read(&task->task_active)) {
2129 pr_debug("transport task: %p cmd: %p timeout task_active"
c66ac9db 2130 " == 0\n", task, cmd);
a1d8b49a 2131 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2132 return;
2133 }
2134
a1d8b49a
AG		 2135 atomic_inc(&cmd->t_se_count);
2136 atomic_inc(&cmd->t_transport_timeout);
2137 cmd->t_tasks_failed = 1;
c66ac9db
NB		 2138
2139 atomic_set(&task->task_timeout, 1);
2140 task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
2141 task->task_scsi_status = 1;
2142
2143 if (atomic_read(&task->task_stop)) {
6708bb27 2144 pr_debug("transport task: %p cmd: %p timeout task_stop"
c66ac9db 2145 " == 1\n", task, cmd);
a1d8b49a 2146 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2147 complete(&task->task_stop_comp);
2148 return;
2149 }
2150
6708bb27
AG		 2151 if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
2152 pr_debug("transport task: %p cmd: %p timeout non zero"
c66ac9db 2153 " t_task_cdbs_left\n", task, cmd);
a1d8b49a 2154 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2155 return;
2156 }
6708bb27 2157 pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
c66ac9db
NB		 2158 task, cmd);
2159
2160 cmd->t_state = TRANSPORT_COMPLETE_FAILURE;
a1d8b49a 2161 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2162
2163 transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE);
2164}
2165
2166/*
a1d8b49a 2167 * Called with cmd->t_state_lock held.
c66ac9db
NB		 2168 */
2169static void transport_start_task_timer(struct se_task *task)
2170{
2171 struct se_device *dev = task->se_dev;
2172 int timeout;
2173
2174 if (task->task_flags & TF_RUNNING)
2175 return;
2176 /*
2177 * If the task_timeout is disabled, exit now.
2178 */
e3d6f909 2179 timeout = dev->se_sub_dev->se_dev_attrib.task_timeout;
6708bb27 2180 if (!timeout)
c66ac9db
NB		 2181 return;
2182
2183 init_timer(&task->task_timer);
2184 task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
2185 task->task_timer.data = (unsigned long) task;
2186 task->task_timer.function = transport_task_timeout_handler;
2187
2188 task->task_flags |= TF_RUNNING;
2189 add_timer(&task->task_timer);
2190#if 0
6708bb27 2191 pr_debug("Starting task timer for cmd: %p task: %p seconds:"
c66ac9db
NB		 2192 " %d\n", task->task_se_cmd, task, timeout);
2193#endif
2194}
2195
2196/*
a1d8b49a 2197 * Called with spin_lock_irq(&cmd->t_state_lock) held.
c66ac9db
NB		 2198 */
2199void __transport_stop_task_timer(struct se_task *task, unsigned long *flags)
2200{
e3d6f909 2201 struct se_cmd *cmd = task->task_se_cmd;
c66ac9db 2202
6708bb27 2203 if (!task->task_flags & TF_RUNNING)
c66ac9db
NB		 2204 return;
2205
2206 task->task_flags |= TF_STOP;
a1d8b49a 2207 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
c66ac9db
NB		 2208
2209 del_timer_sync(&task->task_timer);
2210
a1d8b49a 2211 spin_lock_irqsave(&cmd->t_state_lock, *flags);
c66ac9db
NB		 2212 task->task_flags &= ~TF_RUNNING;
2213 task->task_flags &= ~TF_STOP;
2214}
2215
2216static void transport_stop_all_task_timers(struct se_cmd *cmd)
2217{
2218 struct se_task *task = NULL, *task_tmp;
2219 unsigned long flags;
2220
a1d8b49a 2221 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2222 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2223 &cmd->t_task_list, t_list)
c66ac9db 2224 __transport_stop_task_timer(task, &flags);
a1d8b49a 2225 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2226}
2227
2228static inline int transport_tcq_window_closed(struct se_device *dev)
2229{
2230 if (dev->dev_tcq_window_closed++ <
2231 PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
2232 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
2233 } else
2234 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
2235
e3d6f909 2236 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 2237 return 0;
2238}
2239
2240/*
2241 * Called from Fabric Module context from transport_execute_tasks()
2242 *
2243 * The return of this function determins if the tasks from struct se_cmd
2244 * get added to the execution queue in transport_execute_tasks(),
2245 * or are added to the delayed or ordered lists here.
2246 */
2247static inline int transport_execute_task_attr(struct se_cmd *cmd)
2248{
5951146d 2249 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
c66ac9db
NB		 2250 return 1;
2251 /*
25985edc 2252 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 2253 * to allow the passed struct se_cmd list of tasks to the front of the list.
2254 */
e66ecd50 2255 if (cmd->sam_task_attr == MSG_HEAD_TAG) {
5951146d 2256 atomic_inc(&cmd->se_dev->dev_hoq_count);
c66ac9db 2257 smp_mb__after_atomic_inc();
6708bb27 2258 pr_debug("Added HEAD_OF_QUEUE for CDB:"
c66ac9db 2259 " 0x%02x, se_ordered_id: %u\n",
6708bb27 2260 cmd->t_task_cdb[0],
c66ac9db
NB		 2261 cmd->se_ordered_id);
2262 return 1;
e66ecd50 2263 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
5951146d
AG		 2264 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2265 list_add_tail(&cmd->se_ordered_node,
2266 &cmd->se_dev->ordered_cmd_list);
2267 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
c66ac9db 2268
5951146d 2269 atomic_inc(&cmd->se_dev->dev_ordered_sync);
c66ac9db
NB		 2270 smp_mb__after_atomic_inc();
2271
6708bb27 2272 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
c66ac9db 2273 " list, se_ordered_id: %u\n",
a1d8b49a 2274 cmd->t_task_cdb[0],
c66ac9db
NB		 2275 cmd->se_ordered_id);
2276 /*
2277 * Add ORDERED command to tail of execution queue if
2278 * no other older commands exist that need to be
2279 * completed first.
2280 */
6708bb27 2281 if (!atomic_read(&cmd->se_dev->simple_cmds))
c66ac9db
NB		 2282 return 1;
2283 } else {
2284 /*
2285 * For SIMPLE and UNTAGGED Task Attribute commands
2286 */
5951146d 2287 atomic_inc(&cmd->se_dev->simple_cmds);
c66ac9db
NB		 2288 smp_mb__after_atomic_inc();
2289 }
2290 /*
2291 * Otherwise if one or more outstanding ORDERED task attribute exist,
2292 * add the dormant task(s) built for the passed struct se_cmd to the
2293 * execution queue and become in Active state for this struct se_device.
2294 */
5951146d 2295 if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
c66ac9db
NB		 2296 /*
2297 * Otherwise, add cmd w/ tasks to delayed cmd queue that
25985edc 2298 * will be drained upon completion of HEAD_OF_QUEUE task.
c66ac9db 2299 */
5951146d 2300 spin_lock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2301 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
5951146d
AG		 2302 list_add_tail(&cmd->se_delayed_node,
2303 &cmd->se_dev->delayed_cmd_list);
2304 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
c66ac9db 2305
6708bb27 2306 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
c66ac9db 2307 " delayed CMD list, se_ordered_id: %u\n",
a1d8b49a 2308 cmd->t_task_cdb[0], cmd->sam_task_attr,
c66ac9db
NB		 2309 cmd->se_ordered_id);
2310 /*
2311 * Return zero to let transport_execute_tasks() know
2312 * not to add the delayed tasks to the execution list.
2313 */
2314 return 0;
2315 }
2316 /*
2317 * Otherwise, no ORDERED task attributes exist..
2318 */
2319 return 1;
2320}
2321
2322/*
2323 * Called from fabric module context in transport_generic_new_cmd() and
2324 * transport_generic_process_write()
2325 */
2326static int transport_execute_tasks(struct se_cmd *cmd)
2327{
2328 int add_tasks;
2329
db1620a2
CH		 2330 if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2331 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
2332 transport_generic_request_failure(cmd, NULL, 0, 1);
2333 return 0;
c66ac9db 2334 }
db1620a2 2335
c66ac9db
NB		 2336 /*
2337 * Call transport_cmd_check_stop() to see if a fabric exception
25985edc 2338 * has occurred that prevents execution.
c66ac9db 2339 */
6708bb27 2340 if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
c66ac9db
NB		 2341 /*
2342 * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2343 * attribute for the tasks of the received struct se_cmd CDB
2344 */
2345 add_tasks = transport_execute_task_attr(cmd);
e3d6f909 2346 if (!add_tasks)
c66ac9db
NB		 2347 goto execute_tasks;
2348 /*
2349 * This calls transport_add_tasks_from_cmd() to handle
2350 * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2351 * (if enabled) in __transport_add_task_to_execute_queue() and
2352 * transport_add_task_check_sam_attr().
2353 */
2354 transport_add_tasks_from_cmd(cmd);
2355 }
2356 /*
2357 * Kick the execution queue for the cmd associated struct se_device
2358 * storage object.
2359 */
2360execute_tasks:
5951146d 2361 __transport_execute_tasks(cmd->se_dev);
c66ac9db
NB		 2362 return 0;
2363}
2364
2365/*
2366 * Called to check struct se_device tcq depth window, and once open pull struct se_task
2367 * from struct se_device->execute_task_list and
2368 *
2369 * Called from transport_processing_thread()
2370 */
2371static int __transport_execute_tasks(struct se_device *dev)
2372{
2373 int error;
2374 struct se_cmd *cmd = NULL;
e3d6f909 2375 struct se_task *task = NULL;
c66ac9db
NB		 2376 unsigned long flags;
2377
2378 /*
2379 * Check if there is enough room in the device and HBA queue to send
a1d8b49a 2380 * struct se_tasks to the selected transport.
c66ac9db
NB		 2381 */
2382check_depth:
e3d6f909 2383 if (!atomic_read(&dev->depth_left))
c66ac9db 2384 return transport_tcq_window_closed(dev);
c66ac9db 2385
e3d6f909 2386 dev->dev_tcq_window_closed = 0;
c66ac9db 2387
e3d6f909
AG		 2388 spin_lock_irq(&dev->execute_task_lock);
2389 if (list_empty(&dev->execute_task_list)) {
2390 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2391 return 0;
2392 }
e3d6f909
AG		 2393 task = list_first_entry(&dev->execute_task_list,
2394 struct se_task, t_execute_list);
2395 list_del(&task->t_execute_list);
2396 atomic_set(&task->task_execute_queue, 0);
2397 atomic_dec(&dev->execute_tasks);
2398 spin_unlock_irq(&dev->execute_task_lock);
c66ac9db
NB		 2399
2400 atomic_dec(&dev->depth_left);
c66ac9db 2401
e3d6f909 2402 cmd = task->task_se_cmd;
c66ac9db 2403
a1d8b49a 2404 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 2405 atomic_set(&task->task_active, 1);
2406 atomic_set(&task->task_sent, 1);
a1d8b49a 2407 atomic_inc(&cmd->t_task_cdbs_sent);
c66ac9db 2408
a1d8b49a
AG		 2409 if (atomic_read(&cmd->t_task_cdbs_sent) ==
2410 cmd->t_task_list_num)
c66ac9db
NB		 2411 atomic_set(&cmd->transport_sent, 1);
2412
2413 transport_start_task_timer(task);
a1d8b49a 2414 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2415 /*
2416 * The struct se_cmd->transport_emulate_cdb() function pointer is used
e3d6f909 2417 * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
c66ac9db
NB		 2418 * struct se_subsystem_api->do_task() caller below.
2419 */
2420 if (cmd->transport_emulate_cdb) {
2421 error = cmd->transport_emulate_cdb(cmd);
2422 if (error != 0) {
2423 cmd->transport_error_status = error;
2424 atomic_set(&task->task_active, 0);
2425 atomic_set(&cmd->transport_sent, 0);
2426 transport_stop_tasks_for_cmd(cmd);
2427 transport_generic_request_failure(cmd, dev, 0, 1);
2428 goto check_depth;
2429 }
2430 /*
2431 * Handle the successful completion for transport_emulate_cdb()
2432 * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2433 * Otherwise the caller is expected to complete the task with
2434 * proper status.
2435 */
2436 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2437 cmd->scsi_status = SAM_STAT_GOOD;
2438 task->task_scsi_status = GOOD;
2439 transport_complete_task(task, 1);
2440 }
2441 } else {
2442 /*
2443 * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2444 * RAMDISK we use the internal transport_emulate_control_cdb() logic
2445 * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2446 * LUN emulation code.
2447 *
2448 * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2449 * call ->do_task() directly and let the underlying TCM subsystem plugin
2450 * code handle the CDB emulation.
2451 */
e3d6f909
AG		 2452 if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2453 (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
c66ac9db
NB		 2454 error = transport_emulate_control_cdb(task);
2455 else
e3d6f909 2456 error = dev->transport->do_task(task);
c66ac9db
NB		 2457
2458 if (error != 0) {
2459 cmd->transport_error_status = error;
2460 atomic_set(&task->task_active, 0);
2461 atomic_set(&cmd->transport_sent, 0);
2462 transport_stop_tasks_for_cmd(cmd);
2463 transport_generic_request_failure(cmd, dev, 0, 1);
2464 }
2465 }
2466
2467 goto check_depth;
2468
2469 return 0;
2470}
2471
2472void transport_new_cmd_failure(struct se_cmd *se_cmd)
2473{
2474 unsigned long flags;
2475 /*
2476 * Any unsolicited data will get dumped for failed command inside of
2477 * the fabric plugin
2478 */
a1d8b49a 2479 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2480 se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2481 se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
a1d8b49a 2482 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
c66ac9db
NB		 2483}
2484
c66ac9db
NB		 2485static inline u32 transport_get_sectors_6(
2486 unsigned char *cdb,
2487 struct se_cmd *cmd,
2488 int *ret)
2489{
5951146d 2490 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2491
2492 /*
2493 * Assume TYPE_DISK for non struct se_device objects.
2494 * Use 8-bit sector value.
2495 */
2496 if (!dev)
2497 goto type_disk;
2498
2499 /*
2500 * Use 24-bit allocation length for TYPE_TAPE.
2501 */
e3d6f909 2502 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2503 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2504
2505 /*
2506 * Everything else assume TYPE_DISK Sector CDB location.
2507 * Use 8-bit sector value.
2508 */
2509type_disk:
2510 return (u32)cdb[4];
2511}
2512
2513static inline u32 transport_get_sectors_10(
2514 unsigned char *cdb,
2515 struct se_cmd *cmd,
2516 int *ret)
2517{
5951146d 2518 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2519
2520 /*
2521 * Assume TYPE_DISK for non struct se_device objects.
2522 * Use 16-bit sector value.
2523 */
2524 if (!dev)
2525 goto type_disk;
2526
2527 /*
2528 * XXX_10 is not defined in SSC, throw an exception
2529 */
e3d6f909
AG		 2530 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2531 *ret = -EINVAL;
c66ac9db
NB		 2532 return 0;
2533 }
2534
2535 /*
2536 * Everything else assume TYPE_DISK Sector CDB location.
2537 * Use 16-bit sector value.
2538 */
2539type_disk:
2540 return (u32)(cdb[7] << 8) + cdb[8];
2541}
2542
2543static inline u32 transport_get_sectors_12(
2544 unsigned char *cdb,
2545 struct se_cmd *cmd,
2546 int *ret)
2547{
5951146d 2548 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2549
2550 /*
2551 * Assume TYPE_DISK for non struct se_device objects.
2552 * Use 32-bit sector value.
2553 */
2554 if (!dev)
2555 goto type_disk;
2556
2557 /*
2558 * XXX_12 is not defined in SSC, throw an exception
2559 */
e3d6f909
AG		 2560 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2561 *ret = -EINVAL;
c66ac9db
NB		 2562 return 0;
2563 }
2564
2565 /*
2566 * Everything else assume TYPE_DISK Sector CDB location.
2567 * Use 32-bit sector value.
2568 */
2569type_disk:
2570 return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2571}
2572
2573static inline u32 transport_get_sectors_16(
2574 unsigned char *cdb,
2575 struct se_cmd *cmd,
2576 int *ret)
2577{
5951146d 2578 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2579
2580 /*
2581 * Assume TYPE_DISK for non struct se_device objects.
2582 * Use 32-bit sector value.
2583 */
2584 if (!dev)
2585 goto type_disk;
2586
2587 /*
2588 * Use 24-bit allocation length for TYPE_TAPE.
2589 */
e3d6f909 2590 if (dev->transport->get_device_type(dev) == TYPE_TAPE)
c66ac9db
NB		 2591 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2592
2593type_disk:
2594 return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2595 (cdb[12] << 8) + cdb[13];
2596}
2597
2598/*
2599 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2600 */
2601static inline u32 transport_get_sectors_32(
2602 unsigned char *cdb,
2603 struct se_cmd *cmd,
2604 int *ret)
2605{
2606 /*
2607 * Assume TYPE_DISK for non struct se_device objects.
2608 * Use 32-bit sector value.
2609 */
2610 return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2611 (cdb[30] << 8) + cdb[31];
2612
2613}
2614
2615static inline u32 transport_get_size(
2616 u32 sectors,
2617 unsigned char *cdb,
2618 struct se_cmd *cmd)
2619{
5951146d 2620 struct se_device *dev = cmd->se_dev;
c66ac9db 2621
e3d6f909 2622 if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
c66ac9db 2623 if (cdb[1] & 1) { /* sectors */
e3d6f909 2624 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2625 } else /* bytes */
2626 return sectors;
2627 }
2628#if 0
6708bb27 2629 pr_debug("Returning block_size: %u, sectors: %u == %u for"
e3d6f909
AG		 2630 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2631 dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2632 dev->transport->name);
c66ac9db 2633#endif
e3d6f909 2634 return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
c66ac9db
NB		 2635}
2636
c66ac9db
NB		 2637static void transport_xor_callback(struct se_cmd *cmd)
2638{
2639 unsigned char *buf, *addr;
ec98f782 2640 struct scatterlist *sg;
c66ac9db
NB		 2641 unsigned int offset;
2642 int i;
ec98f782 2643 int count;
c66ac9db
NB		 2644 /*
2645 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2646 *
2647 * 1) read the specified logical block(s);
2648 * 2) transfer logical blocks from the data-out buffer;
2649 * 3) XOR the logical blocks transferred from the data-out buffer with
2650 * the logical blocks read, storing the resulting XOR data in a buffer;
2651 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2652 * blocks transferred from the data-out buffer; and
2653 * 5) transfer the resulting XOR data to the data-in buffer.
2654 */
2655 buf = kmalloc(cmd->data_length, GFP_KERNEL);
6708bb27
AG		 2656 if (!buf) {
2657 pr_err("Unable to allocate xor_callback buf\n");
c66ac9db
NB		 2658 return;
2659 }
2660 /*
ec98f782 2661 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
c66ac9db
NB		 2662 * into the locally allocated *buf
2663 */
ec98f782
AG		 2664 sg_copy_to_buffer(cmd->t_data_sg,
2665 cmd->t_data_nents,
2666 buf,
2667 cmd->data_length);
2668
c66ac9db
NB		 2669 /*
2670 * Now perform the XOR against the BIDI read memory located at
a1d8b49a 2671 * cmd->t_mem_bidi_list
c66ac9db
NB		 2672 */
2673
2674 offset = 0;
ec98f782
AG		 2675 for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2676 addr = kmap_atomic(sg_page(sg), KM_USER0);
2677 if (!addr)
c66ac9db
NB		 2678 goto out;
2679
ec98f782
AG		 2680 for (i = 0; i < sg->length; i++)
2681 *(addr + sg->offset + i) ^= *(buf + offset + i);
c66ac9db 2682
ec98f782 2683 offset += sg->length;
c66ac9db
NB		 2684 kunmap_atomic(addr, KM_USER0);
2685 }
ec98f782 2686
c66ac9db
NB		 2687out:
2688 kfree(buf);
2689}
2690
2691/*
2692 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2693 */
2694static int transport_get_sense_data(struct se_cmd *cmd)
2695{
2696 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2697 struct se_device *dev;
2698 struct se_task *task = NULL, *task_tmp;
2699 unsigned long flags;
2700 u32 offset = 0;
2701
e3d6f909
AG		 2702 WARN_ON(!cmd->se_lun);
2703
a1d8b49a 2704 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2705 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2706 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2707 return 0;
2708 }
2709
2710 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 2711 &cmd->t_task_list, t_list) {
c66ac9db
NB		 2712
2713 if (!task->task_sense)
2714 continue;
2715
2716 dev = task->se_dev;
6708bb27 2717 if (!dev)
c66ac9db
NB		 2718 continue;
2719
e3d6f909 2720 if (!dev->transport->get_sense_buffer) {
6708bb27 2721 pr_err("dev->transport->get_sense_buffer"
c66ac9db
NB		 2722 " is NULL\n");
2723 continue;
2724 }
2725
e3d6f909 2726 sense_buffer = dev->transport->get_sense_buffer(task);
6708bb27
AG		 2727 if (!sense_buffer) {
2728 pr_err("ITT[0x%08x]_TASK[%d]: Unable to locate"
c66ac9db 2729 " sense buffer for task with sense\n",
e3d6f909 2730 cmd->se_tfo->get_task_tag(cmd), task->task_no);
c66ac9db
NB		 2731 continue;
2732 }
a1d8b49a 2733 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2734
e3d6f909 2735 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 2736 TRANSPORT_SENSE_BUFFER);
2737
5951146d 2738 memcpy(&buffer[offset], sense_buffer,
c66ac9db
NB		 2739 TRANSPORT_SENSE_BUFFER);
2740 cmd->scsi_status = task->task_scsi_status;
2741 /* Automatically padded */
2742 cmd->scsi_sense_length =
2743 (TRANSPORT_SENSE_BUFFER + offset);
2744
6708bb27 2745 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
c66ac9db 2746 " and sense\n",
e3d6f909 2747 dev->se_hba->hba_id, dev->transport->name,
c66ac9db
NB		 2748 cmd->scsi_status);
2749 return 0;
2750 }
a1d8b49a 2751 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2752
2753 return -1;
2754}
2755
c66ac9db
NB		 2756static int
2757transport_handle_reservation_conflict(struct se_cmd *cmd)
2758{
c66ac9db
NB		 2759 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2760 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2761 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2762 /*
2763 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2764 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2765 * CONFLICT STATUS.
2766 *
2767 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2768 */
e3d6f909
AG		 2769 if (cmd->se_sess &&
2770 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2771 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 2772 cmd->orig_fe_lun, 0x2C,
2773 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
5951146d 2774 return -EINVAL;
c66ac9db
NB		 2775}
2776
ec98f782
AG		 2777static inline long long transport_dev_end_lba(struct se_device *dev)
2778{
2779 return dev->transport->get_blocks(dev) + 1;
2780}
2781
2782static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2783{
2784 struct se_device *dev = cmd->se_dev;
2785 u32 sectors;
2786
2787 if (dev->transport->get_device_type(dev) != TYPE_DISK)
2788 return 0;
2789
2790 sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2791
6708bb27
AG		 2792 if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2793 pr_err("LBA: %llu Sectors: %u exceeds"
ec98f782
AG		 2794 " transport_dev_end_lba(): %llu\n",
2795 cmd->t_task_lba, sectors,
2796 transport_dev_end_lba(dev));
7abbe7f3 2797 return -EINVAL;
ec98f782
AG		 2798 }
2799
7abbe7f3 2800 return 0;
ec98f782
AG		 2801}
2802
706d5860
NB		 2803static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2804{
2805 /*
2806 * Determine if the received WRITE_SAME is used to for direct
2807 * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2808 * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2809 * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2810 */
2811 int passthrough = (dev->transport->transport_type ==
2812 TRANSPORT_PLUGIN_PHBA_PDEV);
2813
2814 if (!passthrough) {
2815 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2816 pr_err("WRITE_SAME PBDATA and LBDATA"
2817 " bits not supported for Block Discard"
2818 " Emulation\n");
2819 return -ENOSYS;
2820 }
2821 /*
2822 * Currently for the emulated case we only accept
2823 * tpws with the UNMAP=1 bit set.
2824 */
2825 if (!(flags[0] & 0x08)) {
2826 pr_err("WRITE_SAME w/o UNMAP bit not"
2827 " supported for Block Discard Emulation\n");
2828 return -ENOSYS;
2829 }
2830 }
2831
2832 return 0;
2833}
2834
c66ac9db
NB		 2835/* transport_generic_cmd_sequencer():
2836 *
2837 * Generic Command Sequencer that should work for most DAS transport
2838 * drivers.
2839 *
2840 * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2841 * RX Thread.
2842 *
2843 * FIXME: Need to support other SCSI OPCODES where as well.
2844 */
2845static int transport_generic_cmd_sequencer(
2846 struct se_cmd *cmd,
2847 unsigned char *cdb)
2848{
5951146d 2849 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 2850 struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2851 int ret = 0, sector_ret = 0, passthrough;
2852 u32 sectors = 0, size = 0, pr_reg_type = 0;
2853 u16 service_action;
2854 u8 alua_ascq = 0;
2855 /*
2856 * Check for an existing UNIT ATTENTION condition
2857 */
2858 if (core_scsi3_ua_check(cmd, cdb) < 0) {
c66ac9db
NB		 2859 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2860 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
5951146d 2861 return -EINVAL;
c66ac9db
NB		 2862 }
2863 /*
2864 * Check status of Asymmetric Logical Unit Assignment port
2865 */
e3d6f909 2866 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
c66ac9db 2867 if (ret != 0) {
c66ac9db 2868 /*
25985edc 2869 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
c66ac9db
NB		 2870 * The ALUA additional sense code qualifier (ASCQ) is determined
2871 * by the ALUA primary or secondary access state..
2872 */
2873 if (ret > 0) {
2874#if 0
6708bb27 2875 pr_debug("[%s]: ALUA TG Port not available,"
c66ac9db 2876 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
e3d6f909 2877 cmd->se_tfo->get_fabric_name(), alua_ascq);
c66ac9db
NB		 2878#endif
2879 transport_set_sense_codes(cmd, 0x04, alua_ascq);
2880 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2881 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
5951146d 2882 return -EINVAL;
c66ac9db
NB		 2883 }
2884 goto out_invalid_cdb_field;
2885 }
2886 /*
2887 * Check status for SPC-3 Persistent Reservations
2888 */
e3d6f909
AG		 2889 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2890 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
c66ac9db
NB		 2891 cmd, cdb, pr_reg_type) != 0)
2892 return transport_handle_reservation_conflict(cmd);
2893 /*
2894 * This means the CDB is allowed for the SCSI Initiator port
2895 * when said port is *NOT* holding the legacy SPC-2 or
2896 * SPC-3 Persistent Reservation.
2897 */
2898 }
2899
2900 switch (cdb[0]) {
2901 case READ_6:
2902 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2903 if (sector_ret)
2904 goto out_unsupported_cdb;
2905 size = transport_get_size(sectors, cdb, cmd);
2906 cmd->transport_split_cdb = &split_cdb_XX_6;
a1d8b49a 2907 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2908 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2909 break;
2910 case READ_10:
2911 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2912 if (sector_ret)
2913 goto out_unsupported_cdb;
2914 size = transport_get_size(sectors, cdb, cmd);
2915 cmd->transport_split_cdb = &split_cdb_XX_10;
a1d8b49a 2916 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2917 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2918 break;
2919 case READ_12:
2920 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2921 if (sector_ret)
2922 goto out_unsupported_cdb;
2923 size = transport_get_size(sectors, cdb, cmd);
2924 cmd->transport_split_cdb = &split_cdb_XX_12;
a1d8b49a 2925 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 2926 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2927 break;
2928 case READ_16:
2929 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2930 if (sector_ret)
2931 goto out_unsupported_cdb;
2932 size = transport_get_size(sectors, cdb, cmd);
2933 cmd->transport_split_cdb = &split_cdb_XX_16;
a1d8b49a 2934 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 2935 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2936 break;
2937 case WRITE_6:
2938 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2939 if (sector_ret)
2940 goto out_unsupported_cdb;
2941 size = transport_get_size(sectors, cdb, cmd);
2942 cmd->transport_split_cdb = &split_cdb_XX_6;
a1d8b49a 2943 cmd->t_task_lba = transport_lba_21(cdb);
c66ac9db
NB		 2944 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2945 break;
2946 case WRITE_10:
2947 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2948 if (sector_ret)
2949 goto out_unsupported_cdb;
2950 size = transport_get_size(sectors, cdb, cmd);
2951 cmd->transport_split_cdb = &split_cdb_XX_10;
a1d8b49a
AG		 2952 cmd->t_task_lba = transport_lba_32(cdb);
2953 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2954 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2955 break;
2956 case WRITE_12:
2957 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2958 if (sector_ret)
2959 goto out_unsupported_cdb;
2960 size = transport_get_size(sectors, cdb, cmd);
2961 cmd->transport_split_cdb = &split_cdb_XX_12;
a1d8b49a
AG		 2962 cmd->t_task_lba = transport_lba_32(cdb);
2963 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2964 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2965 break;
2966 case WRITE_16:
2967 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2968 if (sector_ret)
2969 goto out_unsupported_cdb;
2970 size = transport_get_size(sectors, cdb, cmd);
2971 cmd->transport_split_cdb = &split_cdb_XX_16;
a1d8b49a
AG		 2972 cmd->t_task_lba = transport_lba_64(cdb);
2973 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2974 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2975 break;
2976 case XDWRITEREAD_10:
2977 if ((cmd->data_direction != DMA_TO_DEVICE) ||
a1d8b49a 2978 !(cmd->t_tasks_bidi))
c66ac9db
NB		 2979 goto out_invalid_cdb_field;
2980 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2981 if (sector_ret)
2982 goto out_unsupported_cdb;
2983 size = transport_get_size(sectors, cdb, cmd);
2984 cmd->transport_split_cdb = &split_cdb_XX_10;
a1d8b49a 2985 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db 2986 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
e3d6f909 2987 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 2988 TRANSPORT_PLUGIN_PHBA_PDEV);
2989 /*
2990 * Skip the remaining assignments for TCM/PSCSI passthrough
2991 */
2992 if (passthrough)
2993 break;
2994 /*
2995 * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
2996 */
2997 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 2998 cmd->t_tasks_fua = (cdb[1] & 0x8);
c66ac9db
NB		 2999 break;
3000 case VARIABLE_LENGTH_CMD:
3001 service_action = get_unaligned_be16(&cdb[8]);
3002 /*
3003 * Determine if this is TCM/PSCSI device and we should disable
3004 * internal emulation for this CDB.
3005 */
e3d6f909 3006 passthrough = (dev->transport->transport_type ==
c66ac9db
NB		 3007 TRANSPORT_PLUGIN_PHBA_PDEV);
3008
3009 switch (service_action) {
3010 case XDWRITEREAD_32:
3011 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
3012 if (sector_ret)
3013 goto out_unsupported_cdb;
3014 size = transport_get_size(sectors, cdb, cmd);
3015 /*
3016 * Use WRITE_32 and READ_32 opcodes for the emulated
3017 * XDWRITE_READ_32 logic.
3018 */
3019 cmd->transport_split_cdb = &split_cdb_XX_32;
a1d8b49a 3020 cmd->t_task_lba = transport_lba_64_ext(cdb);
c66ac9db
NB		 3021 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3022
3023 /*
3024 * Skip the remaining assignments for TCM/PSCSI passthrough
3025 */
3026 if (passthrough)
3027 break;
3028
3029 /*
3030 * Setup BIDI XOR callback to be run during
3031 * transport_generic_complete_ok()
3032 */
3033 cmd->transport_complete_callback = &transport_xor_callback;
a1d8b49a 3034 cmd->t_tasks_fua = (cdb[10] & 0x8);
c66ac9db
NB		 3035 break;
3036 case WRITE_SAME_32:
3037 sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
3038 if (sector_ret)
3039 goto out_unsupported_cdb;
dd3a5ad8 3040
6708bb27 3041 if (sectors)
12850626 3042 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 3043 else {
3044 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
3045 " supported\n");
3046 goto out_invalid_cdb_field;
3047 }
dd3a5ad8 3048
a1d8b49a 3049 cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
c66ac9db
NB		 3050 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3051
706d5860 3052 if (target_check_write_same_discard(&cdb[10], dev) < 0)
c66ac9db 3053 goto out_invalid_cdb_field;
706d5860 3054
c66ac9db
NB		 3055 break;
3056 default:
6708bb27 3057 pr_err("VARIABLE_LENGTH_CMD service action"
c66ac9db
NB		 3058 " 0x%04x not supported\n", service_action);
3059 goto out_unsupported_cdb;
3060 }
3061 break;
e434f1f1 3062 case MAINTENANCE_IN:
e3d6f909 3063 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 3064 /* MAINTENANCE_IN from SCC-2 */
3065 /*
3066 * Check for emulated MI_REPORT_TARGET_PGS.
3067 */
3068 if (cdb[1] == MI_REPORT_TARGET_PGS) {
3069 cmd->transport_emulate_cdb =
e3d6f909 3070 (su_dev->t10_alua.alua_type ==
c66ac9db 3071 SPC3_ALUA_EMULATED) ?
e3d6f909 3072 core_emulate_report_target_port_groups :
c66ac9db
NB		 3073 NULL;
3074 }
3075 size = (cdb[6] << 24) | (cdb[7] << 16) |
3076 (cdb[8] << 8) | cdb[9];
3077 } else {
3078 /* GPCMD_SEND_KEY from multi media commands */
3079 size = (cdb[8] << 8) + cdb[9];
3080 }
05d1c7c0 3081 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3082 break;
3083 case MODE_SELECT:
3084 size = cdb[4];
3085 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3086 break;
3087 case MODE_SELECT_10:
3088 size = (cdb[7] << 8) + cdb[8];
3089 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3090 break;
3091 case MODE_SENSE:
3092 size = cdb[4];
05d1c7c0 3093 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3094 break;
3095 case MODE_SENSE_10:
3096 case GPCMD_READ_BUFFER_CAPACITY:
3097 case GPCMD_SEND_OPC:
3098 case LOG_SELECT:
3099 case LOG_SENSE:
3100 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 3101 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3102 break;
3103 case READ_BLOCK_LIMITS:
3104 size = READ_BLOCK_LEN;
05d1c7c0 3105 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3106 break;
3107 case GPCMD_GET_CONFIGURATION:
3108 case GPCMD_READ_FORMAT_CAPACITIES:
3109 case GPCMD_READ_DISC_INFO:
3110 case GPCMD_READ_TRACK_RZONE_INFO:
3111 size = (cdb[7] << 8) + cdb[8];
3112 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3113 break;
3114 case PERSISTENT_RESERVE_IN:
3115 case PERSISTENT_RESERVE_OUT:
3116 cmd->transport_emulate_cdb =
e3d6f909 3117 (su_dev->t10_pr.res_type ==
c66ac9db 3118 SPC3_PERSISTENT_RESERVATIONS) ?
e3d6f909 3119 core_scsi3_emulate_pr : NULL;
c66ac9db 3120 size = (cdb[7] << 8) + cdb[8];
05d1c7c0 3121 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3122 break;
3123 case GPCMD_MECHANISM_STATUS:
3124 case GPCMD_READ_DVD_STRUCTURE:
3125 size = (cdb[8] << 8) + cdb[9];
3126 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3127 break;
3128 case READ_POSITION:
3129 size = READ_POSITION_LEN;
05d1c7c0 3130 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db 3131 break;
e434f1f1 3132 case MAINTENANCE_OUT:
e3d6f909 3133 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
c66ac9db
NB		 3134 /* MAINTENANCE_OUT from SCC-2
3135 *
3136 * Check for emulated MO_SET_TARGET_PGS.
3137 */
3138 if (cdb[1] == MO_SET_TARGET_PGS) {
3139 cmd->transport_emulate_cdb =
e3d6f909 3140 (su_dev->t10_alua.alua_type ==
c66ac9db 3141 SPC3_ALUA_EMULATED) ?
e3d6f909 3142 core_emulate_set_target_port_groups :
c66ac9db
NB		 3143 NULL;
3144 }
3145
3146 size = (cdb[6] << 24) | (cdb[7] << 16) |
3147 (cdb[8] << 8) | cdb[9];
3148 } else {
3149 /* GPCMD_REPORT_KEY from multi media commands */
3150 size = (cdb[8] << 8) + cdb[9];
3151 }
05d1c7c0 3152 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3153 break;
3154 case INQUIRY:
3155 size = (cdb[3] << 8) + cdb[4];
3156 /*
3157 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3158 * See spc4r17 section 5.3
3159 */
5951146d 3160 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3161 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3162 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3163 break;
3164 case READ_BUFFER:
3165 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 3166 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3167 break;
3168 case READ_CAPACITY:
3169 size = READ_CAP_LEN;
05d1c7c0 3170 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3171 break;
3172 case READ_MEDIA_SERIAL_NUMBER:
3173 case SECURITY_PROTOCOL_IN:
3174 case SECURITY_PROTOCOL_OUT:
3175 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
05d1c7c0 3176 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3177 break;
3178 case SERVICE_ACTION_IN:
3179 case ACCESS_CONTROL_IN:
3180 case ACCESS_CONTROL_OUT:
3181 case EXTENDED_COPY:
3182 case READ_ATTRIBUTE:
3183 case RECEIVE_COPY_RESULTS:
3184 case WRITE_ATTRIBUTE:
3185 size = (cdb[10] << 24) | (cdb[11] << 16) |
3186 (cdb[12] << 8) | cdb[13];
05d1c7c0 3187 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3188 break;
3189 case RECEIVE_DIAGNOSTIC:
3190 case SEND_DIAGNOSTIC:
3191 size = (cdb[3] << 8) | cdb[4];
05d1c7c0 3192 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3193 break;
3194/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3195#if 0
3196 case GPCMD_READ_CD:
3197 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3198 size = (2336 * sectors);
05d1c7c0 3199 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3200 break;
3201#endif
3202 case READ_TOC:
3203 size = cdb[8];
05d1c7c0 3204 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3205 break;
3206 case REQUEST_SENSE:
3207 size = cdb[4];
05d1c7c0 3208 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3209 break;
3210 case READ_ELEMENT_STATUS:
3211 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
05d1c7c0 3212 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3213 break;
3214 case WRITE_BUFFER:
3215 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
05d1c7c0 3216 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3217 break;
3218 case RESERVE:
3219 case RESERVE_10:
3220 /*
3221 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3222 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3223 */
3224 if (cdb[0] == RESERVE_10)
3225 size = (cdb[7] << 8) | cdb[8];
3226 else
3227 size = cmd->data_length;
3228
3229 /*
3230 * Setup the legacy emulated handler for SPC-2 and
3231 * >= SPC-3 compatible reservation handling (CRH=1)
3232 * Otherwise, we assume the underlying SCSI logic is
3233 * is running in SPC_PASSTHROUGH, and wants reservations
3234 * emulation disabled.
3235 */
3236 cmd->transport_emulate_cdb =
e3d6f909 3237 (su_dev->t10_pr.res_type !=
c66ac9db 3238 SPC_PASSTHROUGH) ?
e3d6f909 3239 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 3240 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3241 break;
3242 case RELEASE:
3243 case RELEASE_10:
3244 /*
3245 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3246 * Assume the passthrough or $FABRIC_MOD will tell us about it.
3247 */
3248 if (cdb[0] == RELEASE_10)
3249 size = (cdb[7] << 8) | cdb[8];
3250 else
3251 size = cmd->data_length;
3252
3253 cmd->transport_emulate_cdb =
e3d6f909 3254 (su_dev->t10_pr.res_type !=
c66ac9db 3255 SPC_PASSTHROUGH) ?
e3d6f909 3256 core_scsi2_emulate_crh : NULL;
c66ac9db
NB		 3257 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3258 break;
3259 case SYNCHRONIZE_CACHE:
3260 case 0x91: /* SYNCHRONIZE_CACHE_16: */
3261 /*
3262 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3263 */
3264 if (cdb[0] == SYNCHRONIZE_CACHE) {
3265 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
a1d8b49a 3266 cmd->t_task_lba = transport_lba_32(cdb);
c66ac9db
NB		 3267 } else {
3268 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
a1d8b49a 3269 cmd->t_task_lba = transport_lba_64(cdb);
c66ac9db
NB		 3270 }
3271 if (sector_ret)
3272 goto out_unsupported_cdb;
3273
3274 size = transport_get_size(sectors, cdb, cmd);
3275 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3276
3277 /*
3278 * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3279 */
e3d6f909 3280 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
c66ac9db
NB		 3281 break;
3282 /*
3283 * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3284 * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3285 */
3286 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3287 /*
3288 * Check to ensure that LBA + Range does not exceed past end of
7abbe7f3 3289 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
c66ac9db 3290 */
7abbe7f3
NB		 3291 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
3292 if (transport_cmd_get_valid_sectors(cmd) < 0)
3293 goto out_invalid_cdb_field;
3294 }
c66ac9db
NB		 3295 break;
3296 case UNMAP:
3297 size = get_unaligned_be16(&cdb[7]);
05d1c7c0 3298 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3299 break;
3300 case WRITE_SAME_16:
3301 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3302 if (sector_ret)
3303 goto out_unsupported_cdb;
dd3a5ad8 3304
6708bb27 3305 if (sectors)
12850626 3306 size = transport_get_size(1, cdb, cmd);
6708bb27
AG		 3307 else {
3308 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3309 goto out_invalid_cdb_field;
3310 }
dd3a5ad8 3311
5db0753b 3312 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
706d5860
NB		 3313 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3314
3315 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3316 goto out_invalid_cdb_field;
3317 break;
3318 case WRITE_SAME:
3319 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3320 if (sector_ret)
3321 goto out_unsupported_cdb;
3322
3323 if (sectors)
12850626 3324 size = transport_get_size(1, cdb, cmd);
706d5860
NB		 3325 else {
3326 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3327 goto out_invalid_cdb_field;
c66ac9db 3328 }
706d5860
NB		 3329
3330 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
c66ac9db 3331 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
706d5860
NB		 3332 /*
3333 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3334 * of byte 1 bit 3 UNMAP instead of original reserved field
3335 */
3336 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3337 goto out_invalid_cdb_field;
c66ac9db
NB		 3338 break;
3339 case ALLOW_MEDIUM_REMOVAL:
3340 case GPCMD_CLOSE_TRACK:
3341 case ERASE:
3342 case INITIALIZE_ELEMENT_STATUS:
3343 case GPCMD_LOAD_UNLOAD:
3344 case REZERO_UNIT:
3345 case SEEK_10:
3346 case GPCMD_SET_SPEED:
3347 case SPACE:
3348 case START_STOP:
3349 case TEST_UNIT_READY:
3350 case VERIFY:
3351 case WRITE_FILEMARKS:
3352 case MOVE_MEDIUM:
3353 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3354 break;
3355 case REPORT_LUNS:
3356 cmd->transport_emulate_cdb =
e3d6f909 3357 transport_core_report_lun_response;
c66ac9db
NB		 3358 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3359 /*
3360 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3361 * See spc4r17 section 5.3
3362 */
5951146d 3363 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
e66ecd50 3364 cmd->sam_task_attr = MSG_HEAD_TAG;
05d1c7c0 3365 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
c66ac9db
NB		 3366 break;
3367 default:
6708bb27 3368 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
c66ac9db 3369 " 0x%02x, sending CHECK_CONDITION.\n",
e3d6f909 3370 cmd->se_tfo->get_fabric_name(), cdb[0]);
c66ac9db
NB		 3371 goto out_unsupported_cdb;
3372 }
3373
3374 if (size != cmd->data_length) {
6708bb27 3375 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
c66ac9db 3376 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
e3d6f909 3377 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
c66ac9db
NB		 3378 cmd->data_length, size, cdb[0]);
3379
3380 cmd->cmd_spdtl = size;
3381
3382 if (cmd->data_direction == DMA_TO_DEVICE) {
6708bb27 3383 pr_err("Rejecting underflow/overflow"
c66ac9db
NB		 3384 " WRITE data\n");
3385 goto out_invalid_cdb_field;
3386 }
3387 /*
3388 * Reject READ_* or WRITE_* with overflow/underflow for
3389 * type SCF_SCSI_DATA_SG_IO_CDB.
3390 */
6708bb27
AG		 3391 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
3392 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
c66ac9db 3393 " CDB on non 512-byte sector setup subsystem"
e3d6f909 3394 " plugin: %s\n", dev->transport->name);
c66ac9db
NB		 3395 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3396 goto out_invalid_cdb_field;
3397 }
3398
3399 if (size > cmd->data_length) {
3400 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3401 cmd->residual_count = (size - cmd->data_length);
3402 } else {
3403 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3404 cmd->residual_count = (cmd->data_length - size);
3405 }
3406 cmd->data_length = size;
3407 }
3408
d0229ae3
AG		 3409 /* Let's limit control cdbs to a page, for simplicity's sake. */
3410 if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3411 size > PAGE_SIZE)
3412 goto out_invalid_cdb_field;
3413
c66ac9db
NB		 3414 transport_set_supported_SAM_opcode(cmd);
3415 return ret;
3416
3417out_unsupported_cdb:
3418 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3419 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
5951146d 3420 return -EINVAL;
c66ac9db
NB		 3421out_invalid_cdb_field:
3422 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3423 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
5951146d 3424 return -EINVAL;
c66ac9db
NB		 3425}
3426
c66ac9db
NB		 3427/*
3428 * Called from transport_generic_complete_ok() and
3429 * transport_generic_request_failure() to determine which dormant/delayed
3430 * and ordered cmds need to have their tasks added to the execution queue.
3431 */
3432static void transport_complete_task_attr(struct se_cmd *cmd)
3433{
5951146d 3434 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3435 struct se_cmd *cmd_p, *cmd_tmp;
3436 int new_active_tasks = 0;
3437
e66ecd50 3438 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
c66ac9db
NB		 3439 atomic_dec(&dev->simple_cmds);
3440 smp_mb__after_atomic_dec();
3441 dev->dev_cur_ordered_id++;
6708bb27 3442 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 3443 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3444 cmd->se_ordered_id);
e66ecd50 3445 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
c66ac9db
NB		 3446 atomic_dec(&dev->dev_hoq_count);
3447 smp_mb__after_atomic_dec();
3448 dev->dev_cur_ordered_id++;
6708bb27 3449 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 3450 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3451 cmd->se_ordered_id);
e66ecd50 3452 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
c66ac9db 3453 spin_lock(&dev->ordered_cmd_lock);
5951146d 3454 list_del(&cmd->se_ordered_node);
c66ac9db
NB		 3455 atomic_dec(&dev->dev_ordered_sync);
3456 smp_mb__after_atomic_dec();
3457 spin_unlock(&dev->ordered_cmd_lock);
3458
3459 dev->dev_cur_ordered_id++;
6708bb27 3460 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 3461 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3462 }
3463 /*
3464 * Process all commands up to the last received
3465 * ORDERED task attribute which requires another blocking
3466 * boundary
3467 */
3468 spin_lock(&dev->delayed_cmd_lock);
3469 list_for_each_entry_safe(cmd_p, cmd_tmp,
5951146d 3470 &dev->delayed_cmd_list, se_delayed_node) {
c66ac9db 3471
5951146d 3472 list_del(&cmd_p->se_delayed_node);
c66ac9db
NB		 3473 spin_unlock(&dev->delayed_cmd_lock);
3474
6708bb27 3475 pr_debug("Calling add_tasks() for"
c66ac9db
NB		 3476 " cmd_p: 0x%02x Task Attr: 0x%02x"
3477 " Dormant -> Active, se_ordered_id: %u\n",
6708bb27 3478 cmd_p->t_task_cdb[0],
c66ac9db
NB		 3479 cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3480
3481 transport_add_tasks_from_cmd(cmd_p);
3482 new_active_tasks++;
3483
3484 spin_lock(&dev->delayed_cmd_lock);
e66ecd50 3485 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
c66ac9db
NB		 3486 break;
3487 }
3488 spin_unlock(&dev->delayed_cmd_lock);
3489 /*
3490 * If new tasks have become active, wake up the transport thread
3491 * to do the processing of the Active tasks.
3492 */
3493 if (new_active_tasks != 0)
e3d6f909 3494 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 3495}
3496
07bde79a
NB		 3497static int transport_complete_qf(struct se_cmd *cmd)
3498{
3499 int ret = 0;
3500
3501 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
3502 return cmd->se_tfo->queue_status(cmd);
3503
3504 switch (cmd->data_direction) {
3505 case DMA_FROM_DEVICE:
3506 ret = cmd->se_tfo->queue_data_in(cmd);
3507 break;
3508 case DMA_TO_DEVICE:
ec98f782 3509 if (cmd->t_bidi_data_sg) {
07bde79a
NB		 3510 ret = cmd->se_tfo->queue_data_in(cmd);
3511 if (ret < 0)
3512 return ret;
3513 }
3514 /* Fall through for DMA_TO_DEVICE */
3515 case DMA_NONE:
3516 ret = cmd->se_tfo->queue_status(cmd);
3517 break;
3518 default:
3519 break;
3520 }
3521
3522 return ret;
3523}
3524
3525static void transport_handle_queue_full(
3526 struct se_cmd *cmd,
3527 struct se_device *dev,
3528 int (*qf_callback)(struct se_cmd *))
3529{
3530 spin_lock_irq(&dev->qf_cmd_lock);
3531 cmd->se_cmd_flags |= SCF_EMULATE_QUEUE_FULL;
3532 cmd->transport_qf_callback = qf_callback;
3533 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3534 atomic_inc(&dev->dev_qf_count);
3535 smp_mb__after_atomic_inc();
3536 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3537
3538 schedule_work(&cmd->se_dev->qf_work_queue);
3539}
3540
c66ac9db
NB		 3541static void transport_generic_complete_ok(struct se_cmd *cmd)
3542{
07bde79a 3543 int reason = 0, ret;
c66ac9db
NB		 3544 /*
3545 * Check if we need to move delayed/dormant tasks from cmds on the
3546 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3547 * Attribute.
3548 */
5951146d 3549 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
c66ac9db 3550 transport_complete_task_attr(cmd);
07bde79a
NB		 3551 /*
3552 * Check to schedule QUEUE_FULL work, or execute an existing
3553 * cmd->transport_qf_callback()
3554 */
3555 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3556 schedule_work(&cmd->se_dev->qf_work_queue);
3557
3558 if (cmd->transport_qf_callback) {
3559 ret = cmd->transport_qf_callback(cmd);
3560 if (ret < 0)
3561 goto queue_full;
3562
3563 cmd->transport_qf_callback = NULL;
3564 goto done;
3565 }
c66ac9db
NB		 3566 /*
3567 * Check if we need to retrieve a sense buffer from
3568 * the struct se_cmd in question.
3569 */
3570 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3571 if (transport_get_sense_data(cmd) < 0)
3572 reason = TCM_NON_EXISTENT_LUN;
3573
3574 /*
3575 * Only set when an struct se_task->task_scsi_status returned
3576 * a non GOOD status.
3577 */
3578 if (cmd->scsi_status) {
07bde79a 3579 ret = transport_send_check_condition_and_sense(
c66ac9db 3580 cmd, reason, 1);
07bde79a
NB		 3581 if (ret == -EAGAIN)
3582 goto queue_full;
3583
c66ac9db
NB		 3584 transport_lun_remove_cmd(cmd);
3585 transport_cmd_check_stop_to_fabric(cmd);
3586 return;
3587 }
3588 }
3589 /*
25985edc 3590 * Check for a callback, used by amongst other things
c66ac9db
NB		 3591 * XDWRITE_READ_10 emulation.
3592 */
3593 if (cmd->transport_complete_callback)
3594 cmd->transport_complete_callback(cmd);
3595
3596 switch (cmd->data_direction) {
3597 case DMA_FROM_DEVICE:
3598 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3599 if (cmd->se_lun->lun_sep) {
3600 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3601 cmd->data_length;
3602 }
3603 spin_unlock(&cmd->se_lun->lun_sep_lock);
c66ac9db 3604
07bde79a
NB		 3605 ret = cmd->se_tfo->queue_data_in(cmd);
3606 if (ret == -EAGAIN)
3607 goto queue_full;
c66ac9db
NB		 3608 break;
3609 case DMA_TO_DEVICE:
3610 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3611 if (cmd->se_lun->lun_sep) {
3612 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 3613 cmd->data_length;
3614 }
3615 spin_unlock(&cmd->se_lun->lun_sep_lock);
3616 /*
3617 * Check if we need to send READ payload for BIDI-COMMAND
3618 */
ec98f782 3619 if (cmd->t_bidi_data_sg) {
c66ac9db 3620 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 3621 if (cmd->se_lun->lun_sep) {
3622 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 3623 cmd->data_length;
3624 }
3625 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a
NB		 3626 ret = cmd->se_tfo->queue_data_in(cmd);
3627 if (ret == -EAGAIN)
3628 goto queue_full;
c66ac9db
NB		 3629 break;
3630 }
3631 /* Fall through for DMA_TO_DEVICE */
3632 case DMA_NONE:
07bde79a
NB		 3633 ret = cmd->se_tfo->queue_status(cmd);
3634 if (ret == -EAGAIN)
3635 goto queue_full;
c66ac9db
NB		 3636 break;
3637 default:
3638 break;
3639 }
3640
07bde79a 3641done:
c66ac9db
NB		 3642 transport_lun_remove_cmd(cmd);
3643 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 3644 return;
3645
3646queue_full:
6708bb27 3647 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a
NB		 3648 " data_direction: %d\n", cmd, cmd->data_direction);
3649 transport_handle_queue_full(cmd, cmd->se_dev, transport_complete_qf);
c66ac9db
NB		 3650}
3651
3652static void transport_free_dev_tasks(struct se_cmd *cmd)
3653{
3654 struct se_task *task, *task_tmp;
3655 unsigned long flags;
3656
a1d8b49a 3657 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3658 list_for_each_entry_safe(task, task_tmp,
a1d8b49a 3659 &cmd->t_task_list, t_list) {
c66ac9db
NB		 3660 if (atomic_read(&task->task_active))
3661 continue;
3662
3663 kfree(task->task_sg_bidi);
3664 kfree(task->task_sg);
3665
3666 list_del(&task->t_list);
3667
a1d8b49a 3668 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3669 if (task->se_dev)
e3d6f909 3670 task->se_dev->transport->free_task(task);
c66ac9db 3671 else
6708bb27 3672 pr_err("task[%u] - task->se_dev is NULL\n",
c66ac9db 3673 task->task_no);
a1d8b49a 3674 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 3675 }
a1d8b49a 3676 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3677}
3678
6708bb27 3679static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 3680{
ec98f782 3681 struct scatterlist *sg;
ec98f782 3682 int count;
c66ac9db 3683
6708bb27
AG		 3684 for_each_sg(sgl, sg, nents, count)
3685 __free_page(sg_page(sg));
c66ac9db 3686
6708bb27
AG		 3687 kfree(sgl);
3688}
c66ac9db 3689
6708bb27
AG		 3690static inline void transport_free_pages(struct se_cmd *cmd)
3691{
3692 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3693 return;
3694
3695 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 3696 cmd->t_data_sg = NULL;
3697 cmd->t_data_nents = 0;
c66ac9db 3698
6708bb27 3699 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 3700 cmd->t_bidi_data_sg = NULL;
3701 cmd->t_bidi_data_nents = 0;
c66ac9db
NB		 3702}
3703
d3df7825
CH		 3704/**
3705 * transport_put_cmd - release a reference to a command
3706 * @cmd: command to release
3707 *
3708 * This routine releases our reference to the command and frees it if possible.
3709 */
39c05f32 3710static void transport_put_cmd(struct se_cmd *cmd)
c66ac9db
NB		 3711{
3712 unsigned long flags;
4911e3cc 3713 int free_tasks = 0;
c66ac9db 3714
a1d8b49a 3715 spin_lock_irqsave(&cmd->t_state_lock, flags);
4911e3cc
CH		 3716 if (atomic_read(&cmd->t_fe_count)) {
3717 if (!atomic_dec_and_test(&cmd->t_fe_count))
3718 goto out_busy;
3719 }
3720
3721 if (atomic_read(&cmd->t_se_count)) {
3722 if (!atomic_dec_and_test(&cmd->t_se_count))
3723 goto out_busy;
3724 }
3725
3726 if (atomic_read(&cmd->transport_dev_active)) {
3727 atomic_set(&cmd->transport_dev_active, 0);
3728 transport_all_task_dev_remove_state(cmd);
3729 free_tasks = 1;
c66ac9db 3730 }
a1d8b49a 3731 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 3732
4911e3cc
CH		 3733 if (free_tasks != 0)
3734 transport_free_dev_tasks(cmd);
d3df7825 3735
c66ac9db 3736 transport_free_pages(cmd);
31afc39c 3737 transport_release_cmd(cmd);
39c05f32 3738 return;
4911e3cc
CH		 3739out_busy:
3740 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 3741}
3742
c66ac9db 3743/*
ec98f782
AG		 3744 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3745 * allocating in the core.
c66ac9db
NB		 3746 * @cmd: Associated se_cmd descriptor
3747 * @mem: SGL style memory for TCM WRITE / READ
3748 * @sg_mem_num: Number of SGL elements
3749 * @mem_bidi_in: SGL style memory for TCM BIDI READ
3750 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3751 *
3752 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3753 * of parameters.
3754 */
3755int transport_generic_map_mem_to_cmd(
3756 struct se_cmd *cmd,
5951146d
AG		 3757 struct scatterlist *sgl,
3758 u32 sgl_count,
3759 struct scatterlist *sgl_bidi,
3760 u32 sgl_bidi_count)
c66ac9db 3761{
5951146d 3762 if (!sgl || !sgl_count)
c66ac9db 3763 return 0;
c66ac9db 3764
c66ac9db
NB		 3765 if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3766 (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
c66ac9db 3767
ec98f782
AG		 3768 cmd->t_data_sg = sgl;
3769 cmd->t_data_nents = sgl_count;
c66ac9db 3770
ec98f782
AG		 3771 if (sgl_bidi && sgl_bidi_count) {
3772 cmd->t_bidi_data_sg = sgl_bidi;
3773 cmd->t_bidi_data_nents = sgl_bidi_count;
c66ac9db
NB		 3774 }
3775 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
c66ac9db
NB		 3776 }
3777
3778 return 0;
3779}
3780EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3781
c66ac9db
NB		 3782static int transport_new_cmd_obj(struct se_cmd *cmd)
3783{
5951146d 3784 struct se_device *dev = cmd->se_dev;
01cde4d5 3785 int set_counts = 1, rc, task_cdbs;
c66ac9db 3786
ec98f782
AG		 3787 /*
3788 * Setup any BIDI READ tasks and memory from
3789 * cmd->t_mem_bidi_list so the READ struct se_tasks
3790 * are queued first for the non pSCSI passthrough case.
3791 */
3792 if (cmd->t_bidi_data_sg &&
3793 (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) {
3794 rc = transport_allocate_tasks(cmd,
3795 cmd->t_task_lba,
3796 DMA_FROM_DEVICE,
3797 cmd->t_bidi_data_sg,
3798 cmd->t_bidi_data_nents);
6708bb27 3799 if (rc <= 0) {
c66ac9db
NB		 3800 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3801 cmd->scsi_sense_reason =
ec98f782 3802 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
01cde4d5 3803 return -EINVAL;
c66ac9db 3804 }
ec98f782
AG		 3805 atomic_inc(&cmd->t_fe_count);
3806 atomic_inc(&cmd->t_se_count);
3807 set_counts = 0;
3808 }
3809 /*
3810 * Setup the tasks and memory from cmd->t_mem_list
3811 * Note for BIDI transfers this will contain the WRITE payload
3812 */
3813 task_cdbs = transport_allocate_tasks(cmd,
3814 cmd->t_task_lba,
3815 cmd->data_direction,
3816 cmd->t_data_sg,
3817 cmd->t_data_nents);
6708bb27 3818 if (task_cdbs <= 0) {
ec98f782
AG		 3819 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3820 cmd->scsi_sense_reason =
3821 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
01cde4d5 3822 return -EINVAL;
ec98f782 3823 }
c66ac9db 3824
ec98f782
AG		 3825 if (set_counts) {
3826 atomic_inc(&cmd->t_fe_count);
3827 atomic_inc(&cmd->t_se_count);
c66ac9db
NB		 3828 }
3829
ec98f782
AG		 3830 cmd->t_task_list_num = task_cdbs;
3831
a1d8b49a
AG		 3832 atomic_set(&cmd->t_task_cdbs_left, task_cdbs);
3833 atomic_set(&cmd->t_task_cdbs_ex_left, task_cdbs);
3834 atomic_set(&cmd->t_task_cdbs_timeout_left, task_cdbs);
c66ac9db
NB		 3835 return 0;
3836}
3837
05d1c7c0
AG		 3838void *transport_kmap_first_data_page(struct se_cmd *cmd)
3839{
ec98f782 3840 struct scatterlist *sg = cmd->t_data_sg;
05d1c7c0 3841
ec98f782 3842 BUG_ON(!sg);
05d1c7c0 3843 /*
ec98f782
AG		 3844 * We need to take into account a possible offset here for fabrics like
3845 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3846 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 3847 */
ec98f782 3848 return kmap(sg_page(sg)) + sg->offset;
05d1c7c0
AG		 3849}
3850EXPORT_SYMBOL(transport_kmap_first_data_page);
3851
3852void transport_kunmap_first_data_page(struct se_cmd *cmd)
3853{
ec98f782 3854 kunmap(sg_page(cmd->t_data_sg));
05d1c7c0
AG		 3855}
3856EXPORT_SYMBOL(transport_kunmap_first_data_page);
3857
c66ac9db 3858static int
05d1c7c0 3859transport_generic_get_mem(struct se_cmd *cmd)
c66ac9db 3860{
ec98f782
AG		 3861 u32 length = cmd->data_length;
3862 unsigned int nents;
3863 struct page *page;
3864 int i = 0;
c66ac9db 3865
ec98f782
AG		 3866 nents = DIV_ROUND_UP(length, PAGE_SIZE);
3867 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3868 if (!cmd->t_data_sg)
3869 return -ENOMEM;
c66ac9db 3870
ec98f782
AG		 3871 cmd->t_data_nents = nents;
3872 sg_init_table(cmd->t_data_sg, nents);
c66ac9db 3873
ec98f782
AG		 3874 while (length) {
3875 u32 page_len = min_t(u32, length, PAGE_SIZE);
3876 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3877 if (!page)
3878 goto out;
c66ac9db 3879
ec98f782
AG		 3880 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3881 length -= page_len;
3882 i++;
c66ac9db 3883 }
c66ac9db 3884 return 0;
c66ac9db 3885
ec98f782
AG		 3886out:
3887 while (i >= 0) {
3888 __free_page(sg_page(&cmd->t_data_sg[i]));
3889 i--;
c66ac9db 3890 }
ec98f782
AG		 3891 kfree(cmd->t_data_sg);
3892 cmd->t_data_sg = NULL;
3893 return -ENOMEM;
c66ac9db
NB		 3894}
3895
a1d8b49a
AG		 3896/* Reduce sectors if they are too long for the device */
3897static inline sector_t transport_limit_task_sectors(
c66ac9db
NB		 3898 struct se_device *dev,
3899 unsigned long long lba,
a1d8b49a 3900 sector_t sectors)
c66ac9db 3901{
a1d8b49a 3902 sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
c66ac9db 3903
a1d8b49a
AG		 3904 if (dev->transport->get_device_type(dev) == TYPE_DISK)
3905 if ((lba + sectors) > transport_dev_end_lba(dev))
3906 sectors = ((transport_dev_end_lba(dev) - lba) + 1);
c66ac9db 3907
a1d8b49a 3908 return sectors;
c66ac9db
NB		 3909}
3910
c66ac9db
NB		 3911
3912/*
3913 * This function can be used by HW target mode drivers to create a linked
3914 * scatterlist from all contiguously allocated struct se_task->task_sg[].
3915 * This is intended to be called during the completion path by TCM Core
3916 * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3917 */
3918void transport_do_task_sg_chain(struct se_cmd *cmd)
3919{
ec98f782
AG		 3920 struct scatterlist *sg_first = NULL;
3921 struct scatterlist *sg_prev = NULL;
3922 int sg_prev_nents = 0;
3923 struct scatterlist *sg;
c66ac9db 3924 struct se_task *task;
ec98f782 3925 u32 chained_nents = 0;
c66ac9db
NB		 3926 int i;
3927
ec98f782
AG		 3928 BUG_ON(!cmd->se_tfo->task_sg_chaining);
3929
c66ac9db
NB		 3930 /*
3931 * Walk the struct se_task list and setup scatterlist chains
a1d8b49a 3932 * for each contiguously allocated struct se_task->task_sg[].
c66ac9db 3933 */
a1d8b49a 3934 list_for_each_entry(task, &cmd->t_task_list, t_list) {
ec98f782 3935 if (!task->task_sg)
c66ac9db
NB		 3936 continue;
3937
ec98f782
AG		 3938 if (!sg_first) {
3939 sg_first = task->task_sg;
6708bb27 3940 chained_nents = task->task_sg_nents;
97868c89 3941 } else {
ec98f782 3942 sg_chain(sg_prev, sg_prev_nents, task->task_sg);
6708bb27 3943 chained_nents += task->task_sg_nents;
97868c89 3944 }
c3c74c7a
NB		 3945 /*
3946 * For the padded tasks, use the extra SGL vector allocated
3947 * in transport_allocate_data_tasks() for the sg_prev_nents
3948 * offset into sg_chain() above.. The last task of a
3949 * multi-task list, or a single task will not have
3950 * task->task_sg_padded set..
3951 */
3952 if (task->task_padded_sg)
3953 sg_prev_nents = (task->task_sg_nents + 1);
3954 else
3955 sg_prev_nents = task->task_sg_nents;
ec98f782
AG		 3956
3957 sg_prev = task->task_sg;
c66ac9db
NB		 3958 }
3959 /*
3960 * Setup the starting pointer and total t_tasks_sg_linked_no including
3961 * padding SGs for linking and to mark the end.
3962 */
a1d8b49a 3963 cmd->t_tasks_sg_chained = sg_first;
ec98f782 3964 cmd->t_tasks_sg_chained_no = chained_nents;
c66ac9db 3965
6708bb27 3966 pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
a1d8b49a
AG		 3967 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3968 cmd->t_tasks_sg_chained_no);
c66ac9db 3969
a1d8b49a
AG		 3970 for_each_sg(cmd->t_tasks_sg_chained, sg,
3971 cmd->t_tasks_sg_chained_no, i) {
c66ac9db 3972
6708bb27 3973 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
5951146d 3974 i, sg, sg_page(sg), sg->length, sg->offset);
c66ac9db 3975 if (sg_is_chain(sg))
6708bb27 3976 pr_debug("SG: %p sg_is_chain=1\n", sg);
c66ac9db 3977 if (sg_is_last(sg))
6708bb27 3978 pr_debug("SG: %p sg_is_last=1\n", sg);
c66ac9db 3979 }
c66ac9db
NB		 3980}
3981EXPORT_SYMBOL(transport_do_task_sg_chain);
3982
a1d8b49a
AG		 3983/*
3984 * Break up cmd into chunks transport can handle
3985 */
ec98f782 3986static int transport_allocate_data_tasks(
c66ac9db
NB		 3987 struct se_cmd *cmd,
3988 unsigned long long lba,
c66ac9db 3989 enum dma_data_direction data_direction,
ec98f782
AG		 3990 struct scatterlist *sgl,
3991 unsigned int sgl_nents)
c66ac9db
NB		 3992{
3993 unsigned char *cdb = NULL;
3994 struct se_task *task;
5951146d 3995 struct se_device *dev = cmd->se_dev;
ec98f782 3996 unsigned long flags;
a3eedc22 3997 int task_count, i;
277c5f27 3998 sector_t sectors, dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
ec98f782
AG		 3999 u32 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
4000 struct scatterlist *sg;
4001 struct scatterlist *cmd_sg;
a1d8b49a 4002
ec98f782
AG		 4003 WARN_ON(cmd->data_length % sector_size);
4004 sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
277c5f27
NB		 4005 task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
4006
ec98f782
AG		 4007 cmd_sg = sgl;
4008 for (i = 0; i < task_count; i++) {
c3c74c7a 4009 unsigned int task_size, task_sg_nents_padded;
ec98f782 4010 int count;
a1d8b49a 4011
c66ac9db 4012 task = transport_generic_get_task(cmd, data_direction);
a1d8b49a 4013 if (!task)
ec98f782 4014 return -ENOMEM;
c66ac9db 4015
c66ac9db 4016 task->task_lba = lba;
ec98f782
AG		 4017 task->task_sectors = min(sectors, dev_max_sectors);
4018 task->task_size = task->task_sectors * sector_size;
c66ac9db 4019
e3d6f909 4020 cdb = dev->transport->get_cdb(task);
a1d8b49a
AG		 4021 BUG_ON(!cdb);
4022
4023 memcpy(cdb, cmd->t_task_cdb,
4024 scsi_command_size(cmd->t_task_cdb));
4025
4026 /* Update new cdb with updated lba/sectors */
3a867205 4027 cmd->transport_split_cdb(task->task_lba, task->task_sectors, cdb);
525a48a2
NB		 4028 /*
4029 * This now assumes that passed sg_ents are in PAGE_SIZE chunks
4030 * in order to calculate the number per task SGL entries
4031 */
4032 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
c66ac9db 4033 /*
ec98f782
AG		 4034 * Check if the fabric module driver is requesting that all
4035 * struct se_task->task_sg[] be chained together.. If so,
4036 * then allocate an extra padding SG entry for linking and
c3c74c7a
NB		 4037 * marking the end of the chained SGL for every task except
4038 * the last one for (task_count > 1) operation, or skipping
4039 * the extra padding for the (task_count == 1) case.
c66ac9db 4040 */
c3c74c7a
NB		 4041 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
4042 task_sg_nents_padded = (task->task_sg_nents + 1);
ec98f782 4043 task->task_padded_sg = 1;
c3c74c7a
NB		 4044 } else
4045 task_sg_nents_padded = task->task_sg_nents;
c66ac9db 4046
1d20bb61 4047 task->task_sg = kmalloc(sizeof(struct scatterlist) *
c3c74c7a 4048 task_sg_nents_padded, GFP_KERNEL);
ec98f782
AG		 4049 if (!task->task_sg) {
4050 cmd->se_dev->transport->free_task(task);
4051 return -ENOMEM;
4052 }
4053
c3c74c7a 4054 sg_init_table(task->task_sg, task_sg_nents_padded);
c66ac9db 4055
ec98f782
AG		 4056 task_size = task->task_size;
4057
4058 /* Build new sgl, only up to task_size */
6708bb27 4059 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
ec98f782
AG		 4060 if (cmd_sg->length > task_size)
4061 break;
4062
4063 *sg = *cmd_sg;
4064 task_size -= cmd_sg->length;
4065 cmd_sg = sg_next(cmd_sg);
c66ac9db 4066 }
c66ac9db 4067
ec98f782
AG		 4068 lba += task->task_sectors;
4069 sectors -= task->task_sectors;
c66ac9db 4070
ec98f782
AG		 4071 spin_lock_irqsave(&cmd->t_state_lock, flags);
4072 list_add_tail(&task->t_list, &cmd->t_task_list);
4073 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4074 }
4075
ec98f782 4076 return task_count;
c66ac9db
NB		 4077}
4078
4079static int
ec98f782 4080transport_allocate_control_task(struct se_cmd *cmd)
c66ac9db 4081{
5951146d 4082 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4083 unsigned char *cdb;
4084 struct se_task *task;
ec98f782 4085 unsigned long flags;
c66ac9db
NB		 4086
4087 task = transport_generic_get_task(cmd, cmd->data_direction);
4088 if (!task)
ec98f782 4089 return -ENOMEM;
c66ac9db 4090
e3d6f909 4091 cdb = dev->transport->get_cdb(task);
a1d8b49a
AG		 4092 BUG_ON(!cdb);
4093 memcpy(cdb, cmd->t_task_cdb,
4094 scsi_command_size(cmd->t_task_cdb));
c66ac9db 4095
ec98f782
AG		 4096 task->task_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
4097 GFP_KERNEL);
4098 if (!task->task_sg) {
4099 cmd->se_dev->transport->free_task(task);
4100 return -ENOMEM;
4101 }
4102
4103 memcpy(task->task_sg, cmd->t_data_sg,
4104 sizeof(struct scatterlist) * cmd->t_data_nents);
c66ac9db 4105 task->task_size = cmd->data_length;
6708bb27 4106 task->task_sg_nents = cmd->t_data_nents;
c66ac9db 4107
ec98f782
AG		 4108 spin_lock_irqsave(&cmd->t_state_lock, flags);
4109 list_add_tail(&task->t_list, &cmd->t_task_list);
4110 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4111
6708bb27 4112 /* Success! Return number of tasks allocated */
a3eedc22 4113 return 1;
ec98f782
AG		 4114}
4115
4116static u32 transport_allocate_tasks(
4117 struct se_cmd *cmd,
4118 unsigned long long lba,
4119 enum dma_data_direction data_direction,
4120 struct scatterlist *sgl,
4121 unsigned int sgl_nents)
4122{
01cde4d5
NB		 4123 if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
4124 if (transport_cmd_get_valid_sectors(cmd) < 0)
4125 return -EINVAL;
4126
ec98f782
AG		 4127 return transport_allocate_data_tasks(cmd, lba, data_direction,
4128 sgl, sgl_nents);
01cde4d5 4129 } else
6708bb27
AG		 4130 return transport_allocate_control_task(cmd);
4131
c66ac9db
NB		 4132}
4133
ec98f782 4134
c66ac9db
NB		 4135/* transport_generic_new_cmd(): Called from transport_processing_thread()
4136 *
4137 * Allocate storage transport resources from a set of values predefined
4138 * by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4139 * Any non zero return here is treated as an "out of resource' op here.
4140 */
4141 /*
4142 * Generate struct se_task(s) and/or their payloads for this CDB.
4143 */
a1d8b49a 4144int transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 4145{
c66ac9db
NB		 4146 int ret = 0;
4147
4148 /*
4149 * Determine is the TCM fabric module has already allocated physical
4150 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 4151 * beforehand.
c66ac9db 4152 */
ec98f782
AG		 4153 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
4154 cmd->data_length) {
05d1c7c0 4155 ret = transport_generic_get_mem(cmd);
c66ac9db
NB		 4156 if (ret < 0)
4157 return ret;
4158 }
1d20bb61
NB		 4159 /*
4160 * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4161 * control or data CDB types, and perform the map to backend subsystem
4162 * code from SGL memory allocated here by transport_generic_get_mem(), or
4163 * via pre-existing SGL memory setup explictly by fabric module code with
4164 * transport_generic_map_mem_to_cmd().
4165 */
c66ac9db
NB		 4166 ret = transport_new_cmd_obj(cmd);
4167 if (ret < 0)
4168 return ret;
c66ac9db 4169 /*
a1d8b49a 4170 * For WRITEs, let the fabric know its buffer is ready..
c66ac9db
NB		 4171 * This WRITE struct se_cmd (and all of its associated struct se_task's)
4172 * will be added to the struct se_device execution queue after its WRITE
4173 * data has arrived. (ie: It gets handled by the transport processing
4174 * thread a second time)
4175 */
4176 if (cmd->data_direction == DMA_TO_DEVICE) {
4177 transport_add_tasks_to_state_queue(cmd);
4178 return transport_generic_write_pending(cmd);
4179 }
4180 /*
4181 * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4182 * to the execution queue.
4183 */
4184 transport_execute_tasks(cmd);
4185 return 0;
4186}
a1d8b49a 4187EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db
NB		 4188
4189/* transport_generic_process_write():
4190 *
4191 *
4192 */
4193void transport_generic_process_write(struct se_cmd *cmd)
4194{
c66ac9db
NB		 4195 transport_execute_tasks(cmd);
4196}
4197EXPORT_SYMBOL(transport_generic_process_write);
4198
07bde79a
NB		 4199static int transport_write_pending_qf(struct se_cmd *cmd)
4200{
4201 return cmd->se_tfo->write_pending(cmd);
4202}
4203
c66ac9db
NB		 4204/* transport_generic_write_pending():
4205 *
4206 *
4207 */
4208static int transport_generic_write_pending(struct se_cmd *cmd)
4209{
4210 unsigned long flags;
4211 int ret;
4212
a1d8b49a 4213 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4214 cmd->t_state = TRANSPORT_WRITE_PENDING;
a1d8b49a 4215 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
07bde79a
NB		 4216
4217 if (cmd->transport_qf_callback) {
4218 ret = cmd->transport_qf_callback(cmd);
4219 if (ret == -EAGAIN)
4220 goto queue_full;
4221 else if (ret < 0)
4222 return ret;
4223
4224 cmd->transport_qf_callback = NULL;
4225 return 0;
4226 }
05d1c7c0 4227
c66ac9db
NB		 4228 /*
4229 * Clear the se_cmd for WRITE_PENDING status in order to set
a1d8b49a 4230 * cmd->t_transport_active=0 so that transport_generic_handle_data
c66ac9db 4231 * can be called from HW target mode interrupt code. This is safe
e3d6f909 4232 * to be called with transport_off=1 before the cmd->se_tfo->write_pending
c66ac9db
NB		 4233 * because the se_cmd->se_lun pointer is not being cleared.
4234 */
4235 transport_cmd_check_stop(cmd, 1, 0);
4236
4237 /*
4238 * Call the fabric write_pending function here to let the
4239 * frontend know that WRITE buffers are ready.
4240 */
e3d6f909 4241 ret = cmd->se_tfo->write_pending(cmd);
07bde79a
NB		 4242 if (ret == -EAGAIN)
4243 goto queue_full;
4244 else if (ret < 0)
c66ac9db
NB		 4245 return ret;
4246
4247 return PYX_TRANSPORT_WRITE_PENDING;
07bde79a
NB		 4248
4249queue_full:
6708bb27 4250 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
07bde79a
NB		 4251 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
4252 transport_handle_queue_full(cmd, cmd->se_dev,
4253 transport_write_pending_qf);
4254 return ret;
c66ac9db
NB		 4255}
4256
2dbc43d2
CH		 4257/**
4258 * transport_release_cmd - free a command
4259 * @cmd: command to free
4260 *
4261 * This routine unconditionally frees a command, and reference counting
4262 * or list removal must be done in the caller.
4263 */
35462975 4264void transport_release_cmd(struct se_cmd *cmd)
c66ac9db 4265{
e3d6f909 4266 BUG_ON(!cmd->se_tfo);
c66ac9db 4267
2dbc43d2
CH		 4268 if (cmd->se_tmr_req)
4269 core_tmr_release_req(cmd->se_tmr_req);
4270 if (cmd->t_task_cdb != cmd->__t_task_cdb)
4271 kfree(cmd->t_task_cdb);
35462975 4272 cmd->se_tfo->release_cmd(cmd);
c66ac9db 4273}
35462975 4274EXPORT_SYMBOL(transport_release_cmd);
c66ac9db 4275
39c05f32 4276void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 4277{
d14921d6
NB		 4278 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
4279 if (wait_for_tasks && cmd->se_tmr_req)
4280 transport_wait_for_tasks(cmd);
4281
35462975 4282 transport_release_cmd(cmd);
d14921d6
NB		 4283 } else {
4284 if (wait_for_tasks)
4285 transport_wait_for_tasks(cmd);
4286
c66ac9db
NB		 4287 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
4288
82f1c8a4 4289 if (cmd->se_lun)
c66ac9db 4290 transport_lun_remove_cmd(cmd);
c66ac9db 4291
f4366772
NB		 4292 transport_free_dev_tasks(cmd);
4293
39c05f32 4294 transport_put_cmd(cmd);
c66ac9db
NB		 4295 }
4296}
4297EXPORT_SYMBOL(transport_generic_free_cmd);
4298
c66ac9db
NB		 4299/* transport_lun_wait_for_tasks():
4300 *
4301 * Called from ConfigFS context to stop the passed struct se_cmd to allow
4302 * an struct se_lun to be successfully shutdown.
4303 */
4304static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4305{
4306 unsigned long flags;
4307 int ret;
4308 /*
4309 * If the frontend has already requested this struct se_cmd to
4310 * be stopped, we can safely ignore this struct se_cmd.
4311 */
a1d8b49a
AG		 4312 spin_lock_irqsave(&cmd->t_state_lock, flags);
4313 if (atomic_read(&cmd->t_transport_stop)) {
4314 atomic_set(&cmd->transport_lun_stop, 0);
6708bb27 4315 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
e3d6f909 4316 " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4317 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4318 transport_cmd_check_stop(cmd, 1, 0);
e3d6f909 4319 return -EPERM;
c66ac9db 4320 }
a1d8b49a
AG		 4321 atomic_set(&cmd->transport_lun_fe_stop, 1);
4322 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4323
5951146d 4324 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db
NB		 4325
4326 ret = transport_stop_tasks_for_cmd(cmd);
4327
6708bb27
AG		 4328 pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4329 " %d\n", cmd, cmd->t_task_list_num, ret);
c66ac9db 4330 if (!ret) {
6708bb27 4331 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
e3d6f909 4332 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a 4333 wait_for_completion(&cmd->transport_lun_stop_comp);
6708bb27 4334 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
e3d6f909 4335 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4336 }
5951146d 4337 transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 4338
4339 return 0;
4340}
4341
c66ac9db
NB		 4342static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4343{
4344 struct se_cmd *cmd = NULL;
4345 unsigned long lun_flags, cmd_flags;
4346 /*
4347 * Do exception processing and return CHECK_CONDITION status to the
4348 * Initiator Port.
4349 */
4350 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
5951146d
AG		 4351 while (!list_empty(&lun->lun_cmd_list)) {
4352 cmd = list_first_entry(&lun->lun_cmd_list,
4353 struct se_cmd, se_lun_node);
4354 list_del(&cmd->se_lun_node);
4355
a1d8b49a 4356 atomic_set(&cmd->transport_lun_active, 0);
c66ac9db
NB		 4357 /*
4358 * This will notify iscsi_target_transport.c:
4359 * transport_cmd_check_stop() that a LUN shutdown is in
4360 * progress for the iscsi_cmd_t.
4361 */
a1d8b49a 4362 spin_lock(&cmd->t_state_lock);
6708bb27 4363 pr_debug("SE_LUN[%d] - Setting cmd->transport"
c66ac9db 4364 "_lun_stop for ITT: 0x%08x\n",
e3d6f909
AG		 4365 cmd->se_lun->unpacked_lun,
4366 cmd->se_tfo->get_task_tag(cmd));
a1d8b49a
AG		 4367 atomic_set(&cmd->transport_lun_stop, 1);
4368 spin_unlock(&cmd->t_state_lock);
c66ac9db
NB		 4369
4370 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4371
6708bb27
AG		 4372 if (!cmd->se_lun) {
4373 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
e3d6f909
AG		 4374 cmd->se_tfo->get_task_tag(cmd),
4375 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db
NB		 4376 BUG();
4377 }
4378 /*
4379 * If the Storage engine still owns the iscsi_cmd_t, determine
4380 * and/or stop its context.
4381 */
6708bb27 4382 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
e3d6f909
AG		 4383 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4384 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4385
e3d6f909 4386 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
c66ac9db
NB		 4387 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4388 continue;
4389 }
4390
6708bb27 4391 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
c66ac9db 4392 "_wait_for_tasks(): SUCCESS\n",
e3d6f909
AG		 4393 cmd->se_lun->unpacked_lun,
4394 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4395
a1d8b49a 4396 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
6708bb27 4397 if (!atomic_read(&cmd->transport_dev_active)) {
a1d8b49a 4398 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4399 goto check_cond;
4400 }
a1d8b49a 4401 atomic_set(&cmd->transport_dev_active, 0);
c66ac9db 4402 transport_all_task_dev_remove_state(cmd);
a1d8b49a 4403 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4404
4405 transport_free_dev_tasks(cmd);
4406 /*
4407 * The Storage engine stopped this struct se_cmd before it was
4408 * send to the fabric frontend for delivery back to the
4409 * Initiator Node. Return this SCSI CDB back with an
4410 * CHECK_CONDITION status.
4411 */
4412check_cond:
4413 transport_send_check_condition_and_sense(cmd,
4414 TCM_NON_EXISTENT_LUN, 0);
4415 /*
4416 * If the fabric frontend is waiting for this iscsi_cmd_t to
4417 * be released, notify the waiting thread now that LU has
4418 * finished accessing it.
4419 */
a1d8b49a
AG		 4420 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4421 if (atomic_read(&cmd->transport_lun_fe_stop)) {
6708bb27 4422 pr_debug("SE_LUN[%d] - Detected FE stop for"
c66ac9db
NB		 4423 " struct se_cmd: %p ITT: 0x%08x\n",
4424 lun->unpacked_lun,
e3d6f909 4425 cmd, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4426
a1d8b49a 4427 spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db
NB		 4428 cmd_flags);
4429 transport_cmd_check_stop(cmd, 1, 0);
a1d8b49a 4430 complete(&cmd->transport_lun_fe_stop_comp);
c66ac9db
NB		 4431 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4432 continue;
4433 }
6708bb27 4434 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
e3d6f909 4435 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4436
a1d8b49a 4437 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
c66ac9db
NB		 4438 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4439 }
4440 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4441}
4442
4443static int transport_clear_lun_thread(void *p)
4444{
4445 struct se_lun *lun = (struct se_lun *)p;
4446
4447 __transport_clear_lun_from_sessions(lun);
4448 complete(&lun->lun_shutdown_comp);
4449
4450 return 0;
4451}
4452
4453int transport_clear_lun_from_sessions(struct se_lun *lun)
4454{
4455 struct task_struct *kt;
4456
5951146d 4457 kt = kthread_run(transport_clear_lun_thread, lun,
c66ac9db
NB		 4458 "tcm_cl_%u", lun->unpacked_lun);
4459 if (IS_ERR(kt)) {
6708bb27 4460 pr_err("Unable to start clear_lun thread\n");
e3d6f909 4461 return PTR_ERR(kt);
c66ac9db
NB		 4462 }
4463 wait_for_completion(&lun->lun_shutdown_comp);
4464
4465 return 0;
4466}
4467
d14921d6
NB		 4468/**
4469 * transport_wait_for_tasks - wait for completion to occur
4470 * @cmd: command to wait
c66ac9db 4471 *
d14921d6
NB		 4472 * Called from frontend fabric context to wait for storage engine
4473 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 4474 */
d14921d6 4475void transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 4476{
4477 unsigned long flags;
4478
a1d8b49a 4479 spin_lock_irqsave(&cmd->t_state_lock, flags);
d14921d6
NB		 4480 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4481 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4482 return;
4483 }
4484 /*
4485 * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4486 * has been set in transport_set_supported_SAM_opcode().
4487 */
4488 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4489 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4490 return;
4491 }
c66ac9db
NB		 4492 /*
4493 * If we are already stopped due to an external event (ie: LUN shutdown)
4494 * sleep until the connection can have the passed struct se_cmd back.
a1d8b49a 4495 * The cmd->transport_lun_stopped_sem will be upped by
c66ac9db
NB		 4496 * transport_clear_lun_from_sessions() once the ConfigFS context caller
4497 * has completed its operation on the struct se_cmd.
4498 */
a1d8b49a 4499 if (atomic_read(&cmd->transport_lun_stop)) {
c66ac9db 4500
6708bb27 4501 pr_debug("wait_for_tasks: Stopping"
e3d6f909 4502 " wait_for_completion(&cmd->t_tasktransport_lun_fe"
c66ac9db 4503 "_stop_comp); for ITT: 0x%08x\n",
e3d6f909 4504 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4505 /*
4506 * There is a special case for WRITES where a FE exception +
4507 * LUN shutdown means ConfigFS context is still sleeping on
4508 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4509 * We go ahead and up transport_lun_stop_comp just to be sure
4510 * here.
4511 */
a1d8b49a
AG		 4512 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4513 complete(&cmd->transport_lun_stop_comp);
4514 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4515 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db
NB		 4516
4517 transport_all_task_dev_remove_state(cmd);
4518 /*
4519 * At this point, the frontend who was the originator of this
4520 * struct se_cmd, now owns the structure and can be released through
4521 * normal means below.
4522 */
6708bb27 4523 pr_debug("wait_for_tasks: Stopped"
e3d6f909 4524 " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
c66ac9db 4525 "stop_comp); for ITT: 0x%08x\n",
e3d6f909 4526 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4527
a1d8b49a 4528 atomic_set(&cmd->transport_lun_stop, 0);
c66ac9db 4529 }
a1d8b49a 4530 if (!atomic_read(&cmd->t_transport_active) ||
d14921d6
NB		 4531 atomic_read(&cmd->t_transport_aborted)) {
4532 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4533 return;
4534 }
c66ac9db 4535
a1d8b49a 4536 atomic_set(&cmd->t_transport_stop, 1);
c66ac9db 4537
6708bb27 4538 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
c66ac9db 4539 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
e3d6f909
AG		 4540 " = TRUE\n", cmd, cmd->se_tfo->get_task_tag(cmd),
4541 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
c66ac9db
NB		 4542 cmd->deferred_t_state);
4543
a1d8b49a 4544 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4545
5951146d 4546 wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
c66ac9db 4547
a1d8b49a 4548 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 4549
a1d8b49a
AG		 4550 spin_lock_irqsave(&cmd->t_state_lock, flags);
4551 atomic_set(&cmd->t_transport_active, 0);
4552 atomic_set(&cmd->t_transport_stop, 0);
c66ac9db 4553
6708bb27 4554 pr_debug("wait_for_tasks: Stopped wait_for_compltion("
a1d8b49a 4555 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 4556 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4557
d14921d6 4558 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 4559}
d14921d6 4560EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 4561
4562static int transport_get_sense_codes(
4563 struct se_cmd *cmd,
4564 u8 *asc,
4565 u8 *ascq)
4566{
4567 *asc = cmd->scsi_asc;
4568 *ascq = cmd->scsi_ascq;
4569
4570 return 0;
4571}
4572
4573static int transport_set_sense_codes(
4574 struct se_cmd *cmd,
4575 u8 asc,
4576 u8 ascq)
4577{
4578 cmd->scsi_asc = asc;
4579 cmd->scsi_ascq = ascq;
4580
4581 return 0;
4582}
4583
4584int transport_send_check_condition_and_sense(
4585 struct se_cmd *cmd,
4586 u8 reason,
4587 int from_transport)
4588{
4589 unsigned char *buffer = cmd->sense_buffer;
4590 unsigned long flags;
4591 int offset;
4592 u8 asc = 0, ascq = 0;
4593
a1d8b49a 4594 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4595 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 4596 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4597 return 0;
4598 }
4599 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 4600 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 4601
4602 if (!reason && from_transport)
4603 goto after_reason;
4604
4605 if (!from_transport)
4606 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4607 /*
4608 * Data Segment and SenseLength of the fabric response PDU.
4609 *
4610 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4611 * from include/scsi/scsi_cmnd.h
4612 */
e3d6f909 4613 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
c66ac9db
NB		 4614 TRANSPORT_SENSE_BUFFER);
4615 /*
4616 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
4617 * SENSE KEY values from include/scsi/scsi.h
4618 */
4619 switch (reason) {
4620 case TCM_NON_EXISTENT_LUN:
eb39d340
NB		 4621 /* CURRENT ERROR */
4622 buffer[offset] = 0x70;
4623 /* ILLEGAL REQUEST */
4624 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4625 /* LOGICAL UNIT NOT SUPPORTED */
4626 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4627 break;
c66ac9db
NB		 4628 case TCM_UNSUPPORTED_SCSI_OPCODE:
4629 case TCM_SECTOR_COUNT_TOO_MANY:
4630 /* CURRENT ERROR */
4631 buffer[offset] = 0x70;
4632 /* ILLEGAL REQUEST */
4633 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4634 /* INVALID COMMAND OPERATION CODE */
4635 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4636 break;
4637 case TCM_UNKNOWN_MODE_PAGE:
4638 /* CURRENT ERROR */
4639 buffer[offset] = 0x70;
4640 /* ILLEGAL REQUEST */
4641 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4642 /* INVALID FIELD IN CDB */
4643 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4644 break;
4645 case TCM_CHECK_CONDITION_ABORT_CMD:
4646 /* CURRENT ERROR */
4647 buffer[offset] = 0x70;
4648 /* ABORTED COMMAND */
4649 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4650 /* BUS DEVICE RESET FUNCTION OCCURRED */
4651 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4652 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4653 break;
4654 case TCM_INCORRECT_AMOUNT_OF_DATA:
4655 /* CURRENT ERROR */
4656 buffer[offset] = 0x70;
4657 /* ABORTED COMMAND */
4658 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4659 /* WRITE ERROR */
4660 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4661 /* NOT ENOUGH UNSOLICITED DATA */
4662 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4663 break;
4664 case TCM_INVALID_CDB_FIELD:
4665 /* CURRENT ERROR */
4666 buffer[offset] = 0x70;
4667 /* ABORTED COMMAND */
4668 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4669 /* INVALID FIELD IN CDB */
4670 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4671 break;
4672 case TCM_INVALID_PARAMETER_LIST:
4673 /* CURRENT ERROR */
4674 buffer[offset] = 0x70;
4675 /* ABORTED COMMAND */
4676 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4677 /* INVALID FIELD IN PARAMETER LIST */
4678 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4679 break;
4680 case TCM_UNEXPECTED_UNSOLICITED_DATA:
4681 /* CURRENT ERROR */
4682 buffer[offset] = 0x70;
4683 /* ABORTED COMMAND */
4684 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4685 /* WRITE ERROR */
4686 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4687 /* UNEXPECTED_UNSOLICITED_DATA */
4688 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4689 break;
4690 case TCM_SERVICE_CRC_ERROR:
4691 /* CURRENT ERROR */
4692 buffer[offset] = 0x70;
4693 /* ABORTED COMMAND */
4694 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4695 /* PROTOCOL SERVICE CRC ERROR */
4696 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4697 /* N/A */
4698 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4699 break;
4700 case TCM_SNACK_REJECTED:
4701 /* CURRENT ERROR */
4702 buffer[offset] = 0x70;
4703 /* ABORTED COMMAND */
4704 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4705 /* READ ERROR */
4706 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4707 /* FAILED RETRANSMISSION REQUEST */
4708 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4709 break;
4710 case TCM_WRITE_PROTECTED:
4711 /* CURRENT ERROR */
4712 buffer[offset] = 0x70;
4713 /* DATA PROTECT */
4714 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4715 /* WRITE PROTECTED */
4716 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4717 break;
4718 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4719 /* CURRENT ERROR */
4720 buffer[offset] = 0x70;
4721 /* UNIT ATTENTION */
4722 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4723 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4724 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4725 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4726 break;
4727 case TCM_CHECK_CONDITION_NOT_READY:
4728 /* CURRENT ERROR */
4729 buffer[offset] = 0x70;
4730 /* Not Ready */
4731 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4732 transport_get_sense_codes(cmd, &asc, &ascq);
4733 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4734 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4735 break;
4736 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4737 default:
4738 /* CURRENT ERROR */
4739 buffer[offset] = 0x70;
4740 /* ILLEGAL REQUEST */
4741 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4742 /* LOGICAL UNIT COMMUNICATION FAILURE */
4743 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4744 break;
4745 }
4746 /*
4747 * This code uses linux/include/scsi/scsi.h SAM status codes!
4748 */
4749 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4750 /*
4751 * Automatically padded, this value is encoded in the fabric's
4752 * data_length response PDU containing the SCSI defined sense data.
4753 */
4754 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
4755
4756after_reason:
07bde79a 4757 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4758}
4759EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4760
4761int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4762{
4763 int ret = 0;
4764
a1d8b49a 4765 if (atomic_read(&cmd->t_transport_aborted) != 0) {
6708bb27 4766 if (!send_status ||
c66ac9db
NB		 4767 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4768 return 1;
4769#if 0
6708bb27 4770 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
c66ac9db 4771 " status for CDB: 0x%02x ITT: 0x%08x\n",
a1d8b49a 4772 cmd->t_task_cdb[0],
e3d6f909 4773 cmd->se_tfo->get_task_tag(cmd));
c66ac9db
NB		 4774#endif
4775 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
e3d6f909 4776 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4777 ret = 1;
4778 }
4779 return ret;
4780}
4781EXPORT_SYMBOL(transport_check_aborted_status);
4782
4783void transport_send_task_abort(struct se_cmd *cmd)
4784{
c252f003
NB		 4785 unsigned long flags;
4786
4787 spin_lock_irqsave(&cmd->t_state_lock, flags);
4788 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4789 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4790 return;
4791 }
4792 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4793
c66ac9db
NB		 4794 /*
4795 * If there are still expected incoming fabric WRITEs, we wait
4796 * until until they have completed before sending a TASK_ABORTED
4797 * response. This response with TASK_ABORTED status will be
4798 * queued back to fabric module by transport_check_aborted_status().
4799 */
4800 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 4801 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
a1d8b49a 4802 atomic_inc(&cmd->t_transport_aborted);
c66ac9db
NB		 4803 smp_mb__after_atomic_inc();
4804 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4805 transport_new_cmd_failure(cmd);
4806 return;
4807 }
4808 }
4809 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4810#if 0
6708bb27 4811 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 4812 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 4813 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 4814#endif
e3d6f909 4815 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 4816}
4817
4818/* transport_generic_do_tmr():
4819 *
4820 *
4821 */
4822int transport_generic_do_tmr(struct se_cmd *cmd)
4823{
5951146d 4824 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 4825 struct se_tmr_req *tmr = cmd->se_tmr_req;
4826 int ret;
4827
4828 switch (tmr->function) {
5c6cd613 4829 case TMR_ABORT_TASK:
c66ac9db
NB		 4830 tmr->response = TMR_FUNCTION_REJECTED;
4831 break;
5c6cd613
NB		 4832 case TMR_ABORT_TASK_SET:
4833 case TMR_CLEAR_ACA:
4834 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 4835 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4836 break;
5c6cd613 4837 case TMR_LUN_RESET:
c66ac9db
NB		 4838 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4839 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4840 TMR_FUNCTION_REJECTED;
4841 break;
5c6cd613 4842 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 4843 tmr->response = TMR_FUNCTION_REJECTED;
4844 break;
5c6cd613 4845 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 4846 tmr->response = TMR_FUNCTION_REJECTED;
4847 break;
c66ac9db 4848 default:
6708bb27 4849 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 4850 tmr->function);
4851 tmr->response = TMR_FUNCTION_REJECTED;
4852 break;
4853 }
4854
4855 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 4856 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db
NB		 4857
4858 transport_cmd_check_stop(cmd, 2, 0);
4859 return 0;
4860}
4861
4862/*
4863 * Called with spin_lock_irq(&dev->execute_task_lock); held
4864 *
4865 */
4866static struct se_task *
4867transport_get_task_from_state_list(struct se_device *dev)
4868{
4869 struct se_task *task;
4870
4871 if (list_empty(&dev->state_task_list))
4872 return NULL;
4873
4874 list_for_each_entry(task, &dev->state_task_list, t_state_list)
4875 break;
4876
4877 list_del(&task->t_state_list);
4878 atomic_set(&task->task_state_active, 0);
4879
4880 return task;
4881}
4882
4883static void transport_processing_shutdown(struct se_device *dev)
4884{
4885 struct se_cmd *cmd;
c66ac9db 4886 struct se_task *task;
c66ac9db
NB		 4887 unsigned long flags;
4888 /*
4889 * Empty the struct se_device's struct se_task state list.
4890 */
4891 spin_lock_irqsave(&dev->execute_task_lock, flags);
4892 while ((task = transport_get_task_from_state_list(dev))) {
e3d6f909 4893 if (!task->task_se_cmd) {
6708bb27 4894 pr_err("task->task_se_cmd is NULL!\n");
c66ac9db
NB		 4895 continue;
4896 }
e3d6f909 4897 cmd = task->task_se_cmd;
c66ac9db 4898
c66ac9db
NB		 4899 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
4900
a1d8b49a 4901 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 4902
6708bb27
AG		 4903 pr_debug("PT: cmd: %p task: %p ITT: 0x%08x,"
4904 " i_state: %d, t_state/def_t_state:"
c66ac9db 4905 " %d/%d cdb: 0x%02x\n", cmd, task,
6708bb27
AG		 4906 cmd->se_tfo->get_task_tag(cmd),
4907 cmd->se_tfo->get_cmd_state(cmd),
c66ac9db 4908 cmd->t_state, cmd->deferred_t_state,
a1d8b49a 4909 cmd->t_task_cdb[0]);
6708bb27 4910 pr_debug("PT: ITT[0x%08x] - t_tasks: %d t_task_cdbs_left:"
c66ac9db
NB		 4911 " %d t_task_cdbs_sent: %d -- t_transport_active: %d"
4912 " t_transport_stop: %d t_transport_sent: %d\n",
e3d6f909 4913 cmd->se_tfo->get_task_tag(cmd),
6708bb27 4914 cmd->t_task_list_num,
a1d8b49a
AG		 4915 atomic_read(&cmd->t_task_cdbs_left),
4916 atomic_read(&cmd->t_task_cdbs_sent),
4917 atomic_read(&cmd->t_transport_active),
4918 atomic_read(&cmd->t_transport_stop),
4919 atomic_read(&cmd->t_transport_sent));
c66ac9db
NB		 4920
4921 if (atomic_read(&task->task_active)) {
4922 atomic_set(&task->task_stop, 1);
4923 spin_unlock_irqrestore(
a1d8b49a 4924 &cmd->t_state_lock, flags);
c66ac9db 4925
6708bb27 4926 pr_debug("Waiting for task: %p to shutdown for dev:"
c66ac9db
NB		 4927 " %p\n", task, dev);
4928 wait_for_completion(&task->task_stop_comp);
6708bb27 4929 pr_debug("Completed task: %p shutdown for dev: %p\n",
c66ac9db
NB		 4930 task, dev);
4931
a1d8b49a
AG		 4932 spin_lock_irqsave(&cmd->t_state_lock, flags);
4933 atomic_dec(&cmd->t_task_cdbs_left);
c66ac9db
NB		 4934
4935 atomic_set(&task->task_active, 0);
4936 atomic_set(&task->task_stop, 0);
52208ae3
NB		 4937 } else {
4938 if (atomic_read(&task->task_execute_queue) != 0)
4939 transport_remove_task_from_execute_queue(task, dev);
c66ac9db
NB		 4940 }
4941 __transport_stop_task_timer(task, &flags);
4942
6708bb27 4943 if (!atomic_dec_and_test(&cmd->t_task_cdbs_ex_left)) {
c66ac9db 4944 spin_unlock_irqrestore(
a1d8b49a 4945 &cmd->t_state_lock, flags);
c66ac9db 4946
6708bb27 4947 pr_debug("Skipping task: %p, dev: %p for"
c66ac9db 4948 " t_task_cdbs_ex_left: %d\n", task, dev,
a1d8b49a 4949 atomic_read(&cmd->t_task_cdbs_ex_left));
c66ac9db
NB		 4950
4951 spin_lock_irqsave(&dev->execute_task_lock, flags);
4952 continue;
4953 }
4954
a1d8b49a 4955 if (atomic_read(&cmd->t_transport_active)) {
6708bb27 4956 pr_debug("got t_transport_active = 1 for task: %p, dev:"
c66ac9db
NB		 4957 " %p\n", task, dev);
4958
a1d8b49a 4959 if (atomic_read(&cmd->t_fe_count)) {
c66ac9db 4960 spin_unlock_irqrestore(
a1d8b49a 4961 &cmd->t_state_lock, flags);
c66ac9db
NB		 4962 transport_send_check_condition_and_sense(
4963 cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE,
4964 0);
4965 transport_remove_cmd_from_queue(cmd,
5951146d 4966 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 4967
4968 transport_lun_remove_cmd(cmd);
4969 transport_cmd_check_stop(cmd, 1, 0);
4970 } else {
4971 spin_unlock_irqrestore(
a1d8b49a 4972 &cmd->t_state_lock, flags);
c66ac9db
NB		 4973
4974 transport_remove_cmd_from_queue(cmd,
5951146d 4975 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 4976
4977 transport_lun_remove_cmd(cmd);
4978
4979 if (transport_cmd_check_stop(cmd, 1, 0))
e6a2573f 4980 transport_put_cmd(cmd);
c66ac9db
NB		 4981 }
4982
4983 spin_lock_irqsave(&dev->execute_task_lock, flags);
4984 continue;
4985 }
6708bb27 4986 pr_debug("Got t_transport_active = 0 for task: %p, dev: %p\n",
c66ac9db
NB		 4987 task, dev);
4988
a1d8b49a 4989 if (atomic_read(&cmd->t_fe_count)) {
c66ac9db 4990 spin_unlock_irqrestore(
a1d8b49a 4991 &cmd->t_state_lock, flags);
c66ac9db
NB		 4992 transport_send_check_condition_and_sense(cmd,
4993 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
4994 transport_remove_cmd_from_queue(cmd,
5951146d 4995 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 4996
4997 transport_lun_remove_cmd(cmd);
4998 transport_cmd_check_stop(cmd, 1, 0);
4999 } else {
5000 spin_unlock_irqrestore(
a1d8b49a 5001 &cmd->t_state_lock, flags);
c66ac9db
NB		 5002
5003 transport_remove_cmd_from_queue(cmd,
5951146d 5004 &cmd->se_dev->dev_queue_obj);
c66ac9db
NB		 5005 transport_lun_remove_cmd(cmd);
5006
5007 if (transport_cmd_check_stop(cmd, 1, 0))
e6a2573f 5008 transport_put_cmd(cmd);
c66ac9db
NB		 5009 }
5010
5011 spin_lock_irqsave(&dev->execute_task_lock, flags);
5012 }
5013 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
5014 /*
5015 * Empty the struct se_device's struct se_cmd list.
5016 */
5951146d 5017 while ((cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj))) {
c66ac9db 5018
6708bb27 5019 pr_debug("From Device Queue: cmd: %p t_state: %d\n",
5951146d 5020 cmd, cmd->t_state);
c66ac9db 5021
a1d8b49a 5022 if (atomic_read(&cmd->t_fe_count)) {
c66ac9db
NB		 5023 transport_send_check_condition_and_sense(cmd,
5024 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
5025
5026 transport_lun_remove_cmd(cmd);
5027 transport_cmd_check_stop(cmd, 1, 0);
5028 } else {
5029 transport_lun_remove_cmd(cmd);
5030 if (transport_cmd_check_stop(cmd, 1, 0))
e6a2573f 5031 transport_put_cmd(cmd);
c66ac9db 5032 }
c66ac9db 5033 }
c66ac9db
NB		 5034}
5035
5036/* transport_processing_thread():
5037 *
5038 *
5039 */
5040static int transport_processing_thread(void *param)
5041{
5951146d 5042 int ret;
c66ac9db
NB		 5043 struct se_cmd *cmd;
5044 struct se_device *dev = (struct se_device *) param;
c66ac9db
NB		 5045
5046 set_user_nice(current, -20);
5047
5048 while (!kthread_should_stop()) {
e3d6f909
AG		 5049 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
5050 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
c66ac9db
NB		 5051 kthread_should_stop());
5052 if (ret < 0)
5053 goto out;
5054
5055 spin_lock_irq(&dev->dev_status_lock);
5056 if (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) {
5057 spin_unlock_irq(&dev->dev_status_lock);
5058 transport_processing_shutdown(dev);
5059 continue;
5060 }
5061 spin_unlock_irq(&dev->dev_status_lock);
5062
5063get_cmd:
5064 __transport_execute_tasks(dev);
5065
5951146d
AG		 5066 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
5067 if (!cmd)
c66ac9db
NB		 5068 continue;
5069
5951146d 5070 switch (cmd->t_state) {
680b73c5
CH		 5071 case TRANSPORT_NEW_CMD:
5072 BUG();
5073 break;
c66ac9db 5074 case TRANSPORT_NEW_CMD_MAP:
6708bb27
AG		 5075 if (!cmd->se_tfo->new_cmd_map) {
5076 pr_err("cmd->se_tfo->new_cmd_map is"
c66ac9db
NB		 5077 " NULL for TRANSPORT_NEW_CMD_MAP\n");
5078 BUG();
5079 }
e3d6f909 5080 ret = cmd->se_tfo->new_cmd_map(cmd);
c66ac9db
NB		 5081 if (ret < 0) {
5082 cmd->transport_error_status = ret;
5083 transport_generic_request_failure(cmd, NULL,
5084 0, (cmd->data_direction !=
5085 DMA_TO_DEVICE));
5086 break;
5087 }
c66ac9db 5088 ret = transport_generic_new_cmd(cmd);
07bde79a
NB		 5089 if (ret == -EAGAIN)
5090 break;
5091 else if (ret < 0) {
c66ac9db
NB		 5092 cmd->transport_error_status = ret;
5093 transport_generic_request_failure(cmd, NULL,
5094 0, (cmd->data_direction !=
5095 DMA_TO_DEVICE));
5096 }
5097 break;
5098 case TRANSPORT_PROCESS_WRITE:
5099 transport_generic_process_write(cmd);
5100 break;
5101 case TRANSPORT_COMPLETE_OK:
5102 transport_stop_all_task_timers(cmd);
5103 transport_generic_complete_ok(cmd);
5104 break;
5105 case TRANSPORT_REMOVE:
e6a2573f 5106 transport_put_cmd(cmd);
c66ac9db 5107 break;
f4366772 5108 case TRANSPORT_FREE_CMD_INTR:
82f1c8a4 5109 transport_generic_free_cmd(cmd, 0);
f4366772 5110 break;
c66ac9db
NB		 5111 case TRANSPORT_PROCESS_TMR:
5112 transport_generic_do_tmr(cmd);
5113 break;
5114 case TRANSPORT_COMPLETE_FAILURE:
5115 transport_generic_request_failure(cmd, NULL, 1, 1);
5116 break;
5117 case TRANSPORT_COMPLETE_TIMEOUT:
5118 transport_stop_all_task_timers(cmd);
5119 transport_generic_request_timeout(cmd);
5120 break;
07bde79a
NB		 5121 case TRANSPORT_COMPLETE_QF_WP:
5122 transport_generic_write_pending(cmd);
5123 break;
c66ac9db 5124 default:
6708bb27 5125 pr_err("Unknown t_state: %d deferred_t_state:"
c66ac9db 5126 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
5951146d 5127 " %u\n", cmd->t_state, cmd->deferred_t_state,
e3d6f909
AG		 5128 cmd->se_tfo->get_task_tag(cmd),
5129 cmd->se_tfo->get_cmd_state(cmd),
5130 cmd->se_lun->unpacked_lun);
c66ac9db
NB		 5131 BUG();
5132 }
5133
5134 goto get_cmd;
5135 }
5136
5137out:
5138 transport_release_all_cmds(dev);
5139 dev->process_thread = NULL;
5140 return 0;
5141}
Linux kernel - Deliverables
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