summaryrefslogtreecommitdiff
path: root/include/target/target_core_base.h
blob: b316b44d03f3667fea87daef334a3e5a5060f5bc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
#ifndef TARGET_CORE_BASE_H
#define TARGET_CORE_BASE_H

#include <linux/in.h>
#include <linux/configfs.h>
#include <linux/dma-mapping.h>
#include <linux/blkdev.h>
#include <linux/percpu_ida.h>
#include <linux/t10-pi.h>
#include <net/sock.h>
#include <net/tcp.h>

#define TARGET_CORE_VERSION		"v5.0"

/*
 * Maximum size of a CDB that can be stored in se_cmd without allocating
 * memory dynamically for the CDB.
 */
#define TCM_MAX_COMMAND_SIZE			32
/*
 * From include/scsi/scsi_cmnd.h:SCSI_SENSE_BUFFERSIZE, currently
 * defined 96, but the real limit is 252 (or 260 including the header)
 */
#define TRANSPORT_SENSE_BUFFER			96
/* Used by transport_send_check_condition_and_sense() */
#define SPC_SENSE_KEY_OFFSET			2
#define SPC_ADD_SENSE_LEN_OFFSET		7
#define SPC_DESC_TYPE_OFFSET			8
#define SPC_ADDITIONAL_DESC_LEN_OFFSET		9
#define SPC_VALIDITY_OFFSET			10
#define SPC_ASC_KEY_OFFSET			12
#define SPC_ASCQ_KEY_OFFSET			13
#define TRANSPORT_IQN_LEN			224
/* Used by target_core_store_alua_lu_gp() and target_core_alua_lu_gp_show_attr_members() */
#define LU_GROUP_NAME_BUF			256
/* Used by core_alua_store_tg_pt_gp_info() and target_core_alua_tg_pt_gp_show_attr_members() */
#define TG_PT_GROUP_NAME_BUF			256
/* Used to parse VPD into struct t10_vpd */
#define VPD_TMP_BUF_SIZE			254
/* Used by transport_generic_cmd_sequencer() */
#define READ_BLOCK_LEN          		6
#define READ_CAP_LEN            		8
#define READ_POSITION_LEN       		20
#define INQUIRY_LEN				36
/* Used by transport_get_inquiry_vpd_serial() */
#define INQUIRY_VPD_SERIAL_LEN			254
/* Used by transport_get_inquiry_vpd_device_ident() */
#define INQUIRY_VPD_DEVICE_IDENTIFIER_LEN	254

/* Attempts before moving from SHORT to LONG */
#define PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD	3
#define PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT	3  /* In milliseconds */
#define PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG	10 /* In milliseconds */

#define PYX_TRANSPORT_STATUS_INTERVAL		5 /* In seconds */

/* struct se_dev_attrib sanity values */
/* Default max_unmap_lba_count */
#define DA_MAX_UNMAP_LBA_COUNT			0
/* Default max_unmap_block_desc_count */
#define DA_MAX_UNMAP_BLOCK_DESC_COUNT		0
/* Default unmap_granularity */
#define DA_UNMAP_GRANULARITY_DEFAULT		0
/* Default unmap_granularity_alignment */
#define DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT	0
/* Default unmap_zeroes_data */
#define DA_UNMAP_ZEROES_DATA_DEFAULT		0
/* Default max_write_same_len, disabled by default */
#define DA_MAX_WRITE_SAME_LEN			0
/* Use a model alias based on the configfs backend device name */
#define DA_EMULATE_MODEL_ALIAS			0
/* Emulation for WriteCache and SYNCHRONIZE_CACHE */
#define DA_EMULATE_WRITE_CACHE			0
/* Emulation for UNIT ATTENTION Interlock Control */
#define DA_EMULATE_UA_INTLLCK_CTRL		0
/* Emulation for TASK_ABORTED status (TAS) by default */
#define DA_EMULATE_TAS				1
/* Emulation for Thin Provisioning UNMAP using block/blk-lib.c:blkdev_issue_discard() */
#define DA_EMULATE_TPU				0
/*
 * Emulation for Thin Provisioning WRITE_SAME w/ UNMAP=1 bit using
 * block/blk-lib.c:blkdev_issue_discard()
 */
#define DA_EMULATE_TPWS				0
/* Emulation for CompareAndWrite (AtomicTestandSet) by default */
#define DA_EMULATE_CAW				1
/* Emulation for 3rd Party Copy (ExtendedCopy) by default */
#define DA_EMULATE_3PC				1
/* No Emulation for PSCSI by default */
#define DA_EMULATE_ALUA				0
/* Enforce SCSI Initiator Port TransportID with 'ISID' for PR */
#define DA_ENFORCE_PR_ISIDS			1
/* Force SPC-3 PR Activate Persistence across Target Power Loss */
#define DA_FORCE_PR_APTPL			0
#define DA_STATUS_MAX_SECTORS_MIN		16
#define DA_STATUS_MAX_SECTORS_MAX		8192
/* By default don't report non-rotating (solid state) medium */
#define DA_IS_NONROT				0
/* Queue Algorithm Modifier default for restricted reordering in control mode page */
#define DA_EMULATE_REST_REORD			0

#define SE_INQUIRY_BUF				1024
#define SE_MODE_PAGE_BUF			512
#define SE_SENSE_BUF				96

/* struct se_hba->hba_flags */
enum hba_flags_table {
	HBA_FLAGS_INTERNAL_USE	= 0x01,
	HBA_FLAGS_PSCSI_MODE	= 0x02,
};

/* Special transport agnostic struct se_cmd->t_states */
enum transport_state_table {
	TRANSPORT_NO_STATE	= 0,
	TRANSPORT_NEW_CMD	= 1,
	TRANSPORT_WRITE_PENDING	= 3,
	TRANSPORT_PROCESSING	= 5,
	TRANSPORT_COMPLETE	= 6,
	TRANSPORT_ISTATE_PROCESSING = 11,
	TRANSPORT_COMPLETE_QF_WP = 18,
	TRANSPORT_COMPLETE_QF_OK = 19,
};

/* Used for struct se_cmd->se_cmd_flags */
enum se_cmd_flags_table {
	SCF_SUPPORTED_SAM_OPCODE	= 0x00000001,
	SCF_TRANSPORT_TASK_SENSE	= 0x00000002,
	SCF_EMULATED_TASK_SENSE		= 0x00000004,
	SCF_SCSI_DATA_CDB		= 0x00000008,
	SCF_SCSI_TMR_CDB		= 0x00000010,
	SCF_FUA				= 0x00000080,
	SCF_SE_LUN_CMD			= 0x00000100,
	SCF_BIDI			= 0x00000400,
	SCF_SENT_CHECK_CONDITION	= 0x00000800,
	SCF_OVERFLOW_BIT		= 0x00001000,
	SCF_UNDERFLOW_BIT		= 0x00002000,
	SCF_SEND_DELAYED_TAS		= 0x00004000,
	SCF_ALUA_NON_OPTIMIZED		= 0x00008000,
	SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC = 0x00020000,
	SCF_COMPARE_AND_WRITE		= 0x00080000,
	SCF_COMPARE_AND_WRITE_POST	= 0x00100000,
	SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC = 0x00200000,
	SCF_ACK_KREF			= 0x00400000,
	SCF_USE_CPUID			= 0x00800000,
};

/*
 * Used by transport_send_check_condition_and_sense()
 * to signal which ASC/ASCQ sense payload should be built.
 */
typedef unsigned __bitwise__ sense_reason_t;

enum tcm_sense_reason_table {
#define R(x)	(__force sense_reason_t )(x)
	TCM_NO_SENSE				= R(0x00),
	TCM_NON_EXISTENT_LUN			= R(0x01),
	TCM_UNSUPPORTED_SCSI_OPCODE		= R(0x02),
	TCM_INCORRECT_AMOUNT_OF_DATA		= R(0x03),
	TCM_UNEXPECTED_UNSOLICITED_DATA		= R(0x04),
	TCM_SERVICE_CRC_ERROR			= R(0x05),
	TCM_SNACK_REJECTED			= R(0x06),
	TCM_SECTOR_COUNT_TOO_MANY		= R(0x07),
	TCM_INVALID_CDB_FIELD			= R(0x08),
	TCM_INVALID_PARAMETER_LIST		= R(0x09),
	TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE	= R(0x0a),
	TCM_UNKNOWN_MODE_PAGE			= R(0x0b),
	TCM_WRITE_PROTECTED			= R(0x0c),
	TCM_CHECK_CONDITION_ABORT_CMD		= R(0x0d),
	TCM_CHECK_CONDITION_UNIT_ATTENTION	= R(0x0e),
	TCM_CHECK_CONDITION_NOT_READY		= R(0x0f),
	TCM_RESERVATION_CONFLICT		= R(0x10),
	TCM_ADDRESS_OUT_OF_RANGE		= R(0x11),
	TCM_OUT_OF_RESOURCES			= R(0x12),
	TCM_PARAMETER_LIST_LENGTH_ERROR		= R(0x13),
	TCM_MISCOMPARE_VERIFY			= R(0x14),
	TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED	= R(0x15),
	TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED	= R(0x16),
	TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED	= R(0x17),
#undef R
};

enum target_sc_flags_table {
	TARGET_SCF_BIDI_OP		= 0x01,
	TARGET_SCF_ACK_KREF		= 0x02,
	TARGET_SCF_UNKNOWN_SIZE		= 0x04,
	TARGET_SCF_USE_CPUID	= 0x08,
};

/* fabric independent task management function values */
enum tcm_tmreq_table {
	TMR_ABORT_TASK		= 1,
	TMR_ABORT_TASK_SET	= 2,
	TMR_CLEAR_ACA		= 3,
	TMR_CLEAR_TASK_SET	= 4,
	TMR_LUN_RESET		= 5,
	TMR_TARGET_WARM_RESET	= 6,
	TMR_TARGET_COLD_RESET	= 7,
};

/* fabric independent task management response values */
enum tcm_tmrsp_table {
	TMR_FUNCTION_FAILED		= 0,
	TMR_FUNCTION_COMPLETE		= 1,
	TMR_TASK_DOES_NOT_EXIST		= 2,
	TMR_LUN_DOES_NOT_EXIST		= 3,
	TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED	= 4,
	TMR_FUNCTION_REJECTED		= 5,
};

/*
 * Used for target SCSI statistics
 */
typedef enum {
	SCSI_INST_INDEX,
	SCSI_DEVICE_INDEX,
	SCSI_AUTH_INTR_INDEX,
	SCSI_INDEX_TYPE_MAX
} scsi_index_t;

struct se_cmd;

struct t10_alua_lba_map_member {
	struct list_head lba_map_mem_list;
	int lba_map_mem_alua_state;
	int lba_map_mem_alua_pg_id;
};

struct t10_alua_lba_map {
	u64 lba_map_first_lba;
	u64 lba_map_last_lba;
	struct list_head lba_map_list;
	struct list_head lba_map_mem_list;
};

struct t10_alua {
	/* ALUA Target Port Group ID */
	u16	alua_tg_pt_gps_counter;
	u32	alua_tg_pt_gps_count;
	/* Referrals support */
	spinlock_t lba_map_lock;
	u32     lba_map_segment_size;
	u32     lba_map_segment_multiplier;
	struct list_head lba_map_list;
	spinlock_t tg_pt_gps_lock;
	struct se_device *t10_dev;
	/* Used for default ALUA Target Port Group */
	struct t10_alua_tg_pt_gp *default_tg_pt_gp;
	/* Used for default ALUA Target Port Group ConfigFS group */
	struct config_group alua_tg_pt_gps_group;
	struct list_head tg_pt_gps_list;
};

struct t10_alua_lu_gp {
	u16	lu_gp_id;
	int	lu_gp_valid_id;
	u32	lu_gp_members;
	atomic_t lu_gp_ref_cnt;
	spinlock_t lu_gp_lock;
	struct config_group lu_gp_group;
	struct list_head lu_gp_node;
	struct list_head lu_gp_mem_list;
};

struct t10_alua_lu_gp_member {
	bool lu_gp_assoc;
	atomic_t lu_gp_mem_ref_cnt;
	spinlock_t lu_gp_mem_lock;
	struct t10_alua_lu_gp *lu_gp;
	struct se_device *lu_gp_mem_dev;
	struct list_head lu_gp_mem_list;
};

struct t10_alua_tg_pt_gp {
	u16	tg_pt_gp_id;
	int	tg_pt_gp_valid_id;
	int	tg_pt_gp_alua_supported_states;
	int	tg_pt_gp_alua_pending_state;
	int	tg_pt_gp_alua_previous_state;
	int	tg_pt_gp_alua_access_status;
	int	tg_pt_gp_alua_access_type;
	int	tg_pt_gp_nonop_delay_msecs;
	int	tg_pt_gp_trans_delay_msecs;
	int	tg_pt_gp_implicit_trans_secs;
	int	tg_pt_gp_pref;
	int	tg_pt_gp_write_metadata;
	u32	tg_pt_gp_members;
	atomic_t tg_pt_gp_alua_access_state;
	atomic_t tg_pt_gp_ref_cnt;
	spinlock_t tg_pt_gp_lock;
	struct mutex tg_pt_gp_md_mutex;
	struct se_device *tg_pt_gp_dev;
	struct config_group tg_pt_gp_group;
	struct list_head tg_pt_gp_list;
	struct list_head tg_pt_gp_lun_list;
	struct se_lun *tg_pt_gp_alua_lun;
	struct se_node_acl *tg_pt_gp_alua_nacl;
	struct delayed_work tg_pt_gp_transition_work;
	struct completion *tg_pt_gp_transition_complete;
};

struct t10_vpd {
	unsigned char device_identifier[INQUIRY_VPD_DEVICE_IDENTIFIER_LEN];
	int protocol_identifier_set;
	u32 protocol_identifier;
	u32 device_identifier_code_set;
	u32 association;
	u32 device_identifier_type;
	struct list_head vpd_list;
};

struct t10_wwn {
	char vendor[8];
	char model[16];
	char revision[4];
	char unit_serial[INQUIRY_VPD_SERIAL_LEN];
	spinlock_t t10_vpd_lock;
	struct se_device *t10_dev;
	struct config_group t10_wwn_group;
	struct list_head t10_vpd_list;
};

struct t10_pr_registration {
	/* Used for fabrics that contain WWN+ISID */
#define PR_REG_ISID_LEN				16
	/* PR_REG_ISID_LEN + ',i,0x' */
#define PR_REG_ISID_ID_LEN			(PR_REG_ISID_LEN + 5)
	char pr_reg_isid[PR_REG_ISID_LEN];
	/* Used during APTPL metadata reading */
#define PR_APTPL_MAX_IPORT_LEN			256
	unsigned char pr_iport[PR_APTPL_MAX_IPORT_LEN];
	/* Used during APTPL metadata reading */
#define PR_APTPL_MAX_TPORT_LEN			256
	unsigned char pr_tport[PR_APTPL_MAX_TPORT_LEN];
	u16 pr_aptpl_rpti;
	u16 pr_reg_tpgt;
	/* Reservation effects all target ports */
	int pr_reg_all_tg_pt;
	/* Activate Persistence across Target Power Loss */
	int pr_reg_aptpl;
	int pr_res_holder;
	int pr_res_type;
	int pr_res_scope;
	/* Used for fabric initiator WWPNs using a ISID */
	bool isid_present_at_reg;
	u64 pr_res_mapped_lun;
	u64 pr_aptpl_target_lun;
	u16 tg_pt_sep_rtpi;
	u32 pr_res_generation;
	u64 pr_reg_bin_isid;
	u64 pr_res_key;
	atomic_t pr_res_holders;
	struct se_node_acl *pr_reg_nacl;
	/* Used by ALL_TG_PT=1 registration with deve->pr_ref taken */
	struct se_dev_entry *pr_reg_deve;
	struct list_head pr_reg_list;
	struct list_head pr_reg_abort_list;
	struct list_head pr_reg_aptpl_list;
	struct list_head pr_reg_atp_list;
	struct list_head pr_reg_atp_mem_list;
};

struct t10_reservation {
	/* Reservation effects all target ports */
	int pr_all_tg_pt;
	/* Activate Persistence across Target Power Loss enabled
	 * for SCSI device */
	int pr_aptpl_active;
#define PR_APTPL_BUF_LEN			262144
	u32 pr_generation;
	spinlock_t registration_lock;
	spinlock_t aptpl_reg_lock;
	/*
	 * This will always be set by one individual I_T Nexus.
	 * However with all_tg_pt=1, other I_T Nexus from the
	 * same initiator can access PR reg/res info on a different
	 * target port.
	 *
	 * There is also the 'All Registrants' case, where there is
	 * a single *pr_res_holder of the reservation, but all
	 * registrations are considered reservation holders.
	 */
	struct se_node_acl *pr_res_holder;
	struct list_head registration_list;
	struct list_head aptpl_reg_list;
};

struct se_tmr_req {
	/* Task Management function to be performed */
	u8			function;
	/* Task Management response to send */
	u8			response;
	int			call_transport;
	/* Reference to ITT that Task Mgmt should be performed */
	u64			ref_task_tag;
	void 			*fabric_tmr_ptr;
	struct se_cmd		*task_cmd;
	struct se_device	*tmr_dev;
	struct se_lun		*tmr_lun;
	struct list_head	tmr_list;
};

enum target_prot_op {
	TARGET_PROT_NORMAL	= 0,
	TARGET_PROT_DIN_INSERT	= (1 << 0),
	TARGET_PROT_DOUT_INSERT	= (1 << 1),
	TARGET_PROT_DIN_STRIP	= (1 << 2),
	TARGET_PROT_DOUT_STRIP	= (1 << 3),
	TARGET_PROT_DIN_PASS	= (1 << 4),
	TARGET_PROT_DOUT_PASS	= (1 << 5),
};

#define TARGET_PROT_ALL	TARGET_PROT_DIN_INSERT | TARGET_PROT_DOUT_INSERT | \
			TARGET_PROT_DIN_STRIP | TARGET_PROT_DOUT_STRIP | \
			TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS

enum target_prot_type {
	TARGET_DIF_TYPE0_PROT,
	TARGET_DIF_TYPE1_PROT,
	TARGET_DIF_TYPE2_PROT,
	TARGET_DIF_TYPE3_PROT,
};

enum target_core_dif_check {
	TARGET_DIF_CHECK_GUARD  = 0x1 << 0,
	TARGET_DIF_CHECK_APPTAG = 0x1 << 1,
	TARGET_DIF_CHECK_REFTAG = 0x1 << 2,
};

/* for sam_task_attr */
#define TCM_SIMPLE_TAG	0x20
#define TCM_HEAD_TAG	0x21
#define TCM_ORDERED_TAG	0x22
#define TCM_ACA_TAG	0x24

struct se_cmd {
	/* SAM response code being sent to initiator */
	u8			scsi_status;
	u8			scsi_asc;
	u8			scsi_ascq;
	u16			scsi_sense_length;
	unsigned		cmd_wait_set:1;
	unsigned		unknown_data_length:1;
	bool			state_active:1;
	u64			tag; /* SAM command identifier aka task tag */
	/* Delay for ALUA Active/NonOptimized state access in milliseconds */
	int			alua_nonop_delay;
	/* See include/linux/dma-mapping.h */
	enum dma_data_direction	data_direction;
	/* For SAM Task Attribute */
	int			sam_task_attr;
	/* Used for se_sess->sess_tag_pool */
	unsigned int		map_tag;
	/* Transport protocol dependent state, see transport_state_table */
	enum transport_state_table t_state;
	/* See se_cmd_flags_table */
	u32			se_cmd_flags;
	/* Total size in bytes associated with command */
	u32			data_length;
	u32			residual_count;
	u64			orig_fe_lun;
	/* Persistent Reservation key */
	u64			pr_res_key;
	/* Used for sense data */
	void			*sense_buffer;
	struct list_head	se_delayed_node;
	struct list_head	se_qf_node;
	struct se_device      *se_dev;
	struct se_lun		*se_lun;
	/* Only used for internal passthrough and legacy TCM fabric modules */
	struct se_session	*se_sess;
	struct se_tmr_req	*se_tmr_req;
	struct list_head	se_cmd_list;
	struct completion	cmd_wait_comp;
	const struct target_core_fabric_ops *se_tfo;
	sense_reason_t		(*execute_cmd)(struct se_cmd *);
	sense_reason_t (*transport_complete_callback)(struct se_cmd *, bool, int *);
	void			*protocol_data;

	unsigned char		*t_task_cdb;
	unsigned char		__t_task_cdb[TCM_MAX_COMMAND_SIZE];
	unsigned long long	t_task_lba;
	unsigned int		t_task_nolb;
	unsigned int		transport_state;
#define CMD_T_ABORTED		(1 << 0)
#define CMD_T_ACTIVE		(1 << 1)
#define CMD_T_COMPLETE		(1 << 2)
#define CMD_T_SENT		(1 << 4)
#define CMD_T_STOP		(1 << 5)
#define CMD_T_DEV_ACTIVE	(1 << 7)
#define CMD_T_BUSY		(1 << 9)
#define CMD_T_TAS		(1 << 10)
#define CMD_T_FABRIC_STOP	(1 << 11)
	spinlock_t		t_state_lock;
	struct kref		cmd_kref;
	struct completion	t_transport_stop_comp;

	struct work_struct	work;

	struct scatterlist	*t_data_sg;
	struct scatterlist	*t_data_sg_orig;
	unsigned int		t_data_nents;
	unsigned int		t_data_nents_orig;
	void			*t_data_vmap;
	struct scatterlist	*t_bidi_data_sg;
	unsigned int		t_bidi_data_nents;

	/* Used for lun->lun_ref counting */
	int			lun_ref_active;

	struct list_head	state_list;

	/* backend private data */
	void			*priv;

	/* DIF related members */
	enum target_prot_op	prot_op;
	enum target_prot_type	prot_type;
	u8			prot_checks;
	bool			prot_pto;
	u32			prot_length;
	u32			reftag_seed;
	struct scatterlist	*t_prot_sg;
	unsigned int		t_prot_nents;
	sense_reason_t		pi_err;
	sector_t		bad_sector;
	int			cpuid;
};

struct se_ua {
	u8			ua_asc;
	u8			ua_ascq;
	struct list_head	ua_nacl_list;
};

struct se_node_acl {
	char			initiatorname[TRANSPORT_IQN_LEN];
	/* Used to signal demo mode created ACL, disabled by default */
	bool			dynamic_node_acl;
	u32			queue_depth;
	u32			acl_index;
	enum target_prot_type	saved_prot_type;
#define MAX_ACL_TAG_SIZE 64
	char			acl_tag[MAX_ACL_TAG_SIZE];
	/* Used for PR SPEC_I_PT=1 and REGISTER_AND_MOVE */
	atomic_t		acl_pr_ref_count;
	struct hlist_head	lun_entry_hlist;
	struct se_session	*nacl_sess;
	struct se_portal_group *se_tpg;
	struct mutex		lun_entry_mutex;
	spinlock_t		nacl_sess_lock;
	struct config_group	acl_group;
	struct config_group	acl_attrib_group;
	struct config_group	acl_auth_group;
	struct config_group	acl_param_group;
	struct config_group	acl_fabric_stat_group;
	struct list_head	acl_list;
	struct list_head	acl_sess_list;
	struct completion	acl_free_comp;
	struct kref		acl_kref;
};

static inline struct se_node_acl *acl_to_nacl(struct config_item *item)
{
	return container_of(to_config_group(item), struct se_node_acl,
			acl_group);
}

static inline struct se_node_acl *attrib_to_nacl(struct config_item *item)
{
	return container_of(to_config_group(item), struct se_node_acl,
			acl_attrib_group);
}

static inline struct se_node_acl *auth_to_nacl(struct config_item *item)
{
	return container_of(to_config_group(item), struct se_node_acl,
			acl_auth_group);
}

static inline struct se_node_acl *param_to_nacl(struct config_item *item)
{
	return container_of(to_config_group(item), struct se_node_acl,
			acl_param_group);
}

static inline struct se_node_acl *fabric_stat_to_nacl(struct config_item *item)
{
	return container_of(to_config_group(item), struct se_node_acl,
			acl_fabric_stat_group);
}

struct se_session {
	unsigned		sess_tearing_down:1;
	u64			sess_bin_isid;
	enum target_prot_op	sup_prot_ops;
	enum target_prot_type	sess_prot_type;
	struct se_node_acl	*se_node_acl;
	struct se_portal_group *se_tpg;
	void			*fabric_sess_ptr;
	struct list_head	sess_list;
	struct list_head	sess_acl_list;
	struct list_head	sess_cmd_list;
	struct list_head	sess_wait_list;
	spinlock_t		sess_cmd_lock;
	void			*sess_cmd_map;
	struct percpu_ida	sess_tag_pool;
};

struct se_device;
struct se_transform_info;
struct scatterlist;

struct se_ml_stat_grps {
	struct config_group	stat_group;
	struct config_group	scsi_auth_intr_group;
	struct config_group	scsi_att_intr_port_group;
};

struct se_lun_acl {
	u64			mapped_lun;
	struct se_node_acl	*se_lun_nacl;
	struct se_lun		*se_lun;
	struct config_group	se_lun_group;
	struct se_ml_stat_grps	ml_stat_grps;
};

struct se_dev_entry {
	u64			mapped_lun;
	u64			pr_res_key;
	u64			creation_time;
	bool			lun_access_ro;
	u32			attach_count;
	atomic_long_t		total_cmds;
	atomic_long_t		read_bytes;
	atomic_long_t		write_bytes;
	atomic_t		ua_count;
	/* Used for PR SPEC_I_PT=1 and REGISTER_AND_MOVE */
	struct kref		pr_kref;
	struct completion	pr_comp;
	struct se_lun_acl __rcu	*se_lun_acl;
	spinlock_t		ua_lock;
	struct se_lun __rcu	*se_lun;
#define DEF_PR_REG_ACTIVE		1
	unsigned long		deve_flags;
	struct list_head	alua_port_list;
	struct list_head	lun_link;
	struct list_head	ua_list;
	struct hlist_node	link;
	struct rcu_head		rcu_head;
};

struct se_dev_attrib {
	int		emulate_model_alias;
	int		emulate_dpo;
	int		emulate_fua_write;
	int		emulate_fua_read;
	int		emulate_write_cache;
	int		emulate_ua_intlck_ctrl;
	int		emulate_tas;
	int		emulate_tpu;
	int		emulate_tpws;
	int		emulate_caw;
	int		emulate_3pc;
	int		pi_prot_format;
	enum target_prot_type pi_prot_type;
	enum target_prot_type hw_pi_prot_type;
	int		enforce_pr_isids;
	int		force_pr_aptpl;
	int		is_nonrot;
	int		emulate_rest_reord;
	int		unmap_zeroes_data;
	u32		hw_block_size;
	u32		block_size;
	u32		hw_max_sectors;
	u32		optimal_sectors;
	u32		hw_queue_depth;
	u32		queue_depth;
	u32		max_unmap_lba_count;
	u32		max_unmap_block_desc_count;
	u32		unmap_granularity;
	u32		unmap_granularity_alignment;
	u32		max_write_same_len;
	u32		max_bytes_per_io;
	struct se_device *da_dev;
	struct config_group da_group;
};

struct se_port_stat_grps {
	struct config_group stat_group;
	struct config_group scsi_port_group;
	struct config_group scsi_tgt_port_group;
	struct config_group scsi_transport_group;
};

struct scsi_port_stats {
	atomic_long_t	cmd_pdus;
	atomic_long_t	tx_data_octets;
	atomic_long_t	rx_data_octets;
};

struct se_lun {
	u64			unpacked_lun;
#define SE_LUN_LINK_MAGIC			0xffff7771
	u32			lun_link_magic;
	bool			lun_access_ro;
	u32			lun_index;

	/* RELATIVE TARGET PORT IDENTIFER */
	u16			lun_rtpi;
	atomic_t		lun_acl_count;
	struct se_device __rcu	*lun_se_dev;

	struct list_head	lun_deve_list;
	spinlock_t		lun_deve_lock;

	/* ALUA state */
	int			lun_tg_pt_secondary_stat;
	int			lun_tg_pt_secondary_write_md;
	atomic_t		lun_tg_pt_secondary_offline;
	struct mutex		lun_tg_pt_md_mutex;

	/* ALUA target port group linkage */
	struct list_head	lun_tg_pt_gp_link;
	struct t10_alua_tg_pt_gp *lun_tg_pt_gp;
	spinlock_t		lun_tg_pt_gp_lock;

	struct se_portal_group	*lun_tpg;
	struct scsi_port_stats	lun_stats;
	struct config_group	lun_group;
	struct se_port_stat_grps port_stat_grps;
	struct completion	lun_ref_comp;
	struct percpu_ref	lun_ref;
	struct list_head	lun_dev_link;
	struct hlist_node	link;
	struct rcu_head		rcu_head;
};

struct se_dev_stat_grps {
	struct config_group stat_group;
	struct config_group scsi_dev_group;
	struct config_group scsi_tgt_dev_group;
	struct config_group scsi_lu_group;
};

struct se_device {
#define SE_DEV_LINK_MAGIC			0xfeeddeef
	u32			dev_link_magic;
	/* RELATIVE TARGET PORT IDENTIFER Counter */
	u16			dev_rpti_counter;
	/* Used for SAM Task Attribute ordering */
	u32			dev_cur_ordered_id;
	u32			dev_flags;
#define DF_CONFIGURED				0x00000001
#define DF_FIRMWARE_VPD_UNIT_SERIAL		0x00000002
#define DF_EMULATED_VPD_UNIT_SERIAL		0x00000004
#define DF_USING_UDEV_PATH			0x00000008
#define DF_USING_ALIAS				0x00000010
#define DF_READ_ONLY				0x00000020
	/* Physical device queue depth */
	u32			queue_depth;
	/* Used for SPC-2 reservations enforce of ISIDs */
	u64			dev_res_bin_isid;
	/* Pointer to transport specific device structure */
	u32			dev_index;
	u64			creation_time;
	atomic_long_t		num_resets;
	atomic_long_t		num_cmds;
	atomic_long_t		read_bytes;
	atomic_long_t		write_bytes;
	/* Active commands on this virtual SE device */
	atomic_t		simple_cmds;
	atomic_t		dev_ordered_sync;
	atomic_t		dev_qf_count;
	u32			export_count;
	spinlock_t		delayed_cmd_lock;
	spinlock_t		execute_task_lock;
	spinlock_t		dev_reservation_lock;
	unsigned int		dev_reservation_flags;
#define DRF_SPC2_RESERVATIONS			0x00000001
#define DRF_SPC2_RESERVATIONS_WITH_ISID		0x00000002
	spinlock_t		se_port_lock;
	spinlock_t		se_tmr_lock;
	spinlock_t		qf_cmd_lock;
	struct semaphore	caw_sem;
	/* Used for legacy SPC-2 reservationsa */
	struct se_node_acl	*dev_reserved_node_acl;
	/* Used for ALUA Logical Unit Group membership */
	struct t10_alua_lu_gp_member *dev_alua_lu_gp_mem;
	/* Used for SPC-3 Persistent Reservations */
	struct t10_pr_registration *dev_pr_res_holder;
	struct list_head	dev_sep_list;
	struct list_head	dev_tmr_list;
	struct workqueue_struct *tmr_wq;
	struct work_struct	qf_work_queue;
	struct list_head	delayed_cmd_list;
	struct list_head	state_list;
	struct list_head	qf_cmd_list;
	struct list_head	g_dev_node;
	/* Pointer to associated SE HBA */
	struct se_hba		*se_hba;
	/* T10 Inquiry and VPD WWN Information */
	struct t10_wwn		t10_wwn;
	/* T10 Asymmetric Logical Unit Assignment for Target Ports */
	struct t10_alua		t10_alua;
	/* T10 SPC-2 + SPC-3 Reservations */
	struct t10_reservation	t10_pr;
	struct se_dev_attrib	dev_attrib;
	struct config_group	dev_group;
	struct config_group	dev_pr_group;
	struct se_dev_stat_grps dev_stat_grps;
#define SE_DEV_ALIAS_LEN 512		/* must be less than PAGE_SIZE */
	unsigned char		dev_alias[SE_DEV_ALIAS_LEN];
#define SE_UDEV_PATH_LEN 512		/* must be less than PAGE_SIZE */
	unsigned char		udev_path[SE_UDEV_PATH_LEN];
	/* Pointer to template of function pointers for transport */
	const struct target_backend_ops *transport;
	/* Linked list for struct se_hba struct se_device list */
	struct list_head	dev_list;
	struct se_lun		xcopy_lun;
	/* Protection Information */
	int			prot_length;
	/* For se_lun->lun_se_dev RCU read-side critical access */
	u32			hba_index;
	struct rcu_head		rcu_head;
};

struct se_hba {
	u16			hba_tpgt;
	u32			hba_id;
	/* See hba_flags_table */
	u32			hba_flags;
	/* Virtual iSCSI devices attached. */
	u32			dev_count;
	u32			hba_index;
	/* Pointer to transport specific host structure. */
	void			*hba_ptr;
	struct list_head	hba_node;
	spinlock_t		device_lock;
	struct config_group	hba_group;
	struct mutex		hba_access_mutex;
	struct target_backend	*backend;
};

struct se_tpg_np {
	struct se_portal_group *tpg_np_parent;
	struct config_group	tpg_np_group;
};

static inline struct se_tpg_np *to_tpg_np(struct config_item *item)
{
	return container_of(to_config_group(item), struct se_tpg_np,
			tpg_np_group);
}

struct se_portal_group {
	/*
	 * PROTOCOL IDENTIFIER value per SPC4, 7.5.1.
	 *
	 * Negative values can be used by fabric drivers for internal use TPGs.
	 */
	int			proto_id;
	/* Used for PR SPEC_I_PT=1 and REGISTER_AND_MOVE */
	atomic_t		tpg_pr_ref_count;
	/* Spinlock for adding/removing ACLed Nodes */
	struct mutex		acl_node_mutex;
	/* Spinlock for adding/removing sessions */
	spinlock_t		session_lock;
	struct mutex		tpg_lun_mutex;
	struct list_head	se_tpg_node;
	/* linked list for initiator ACL list */
	struct list_head	acl_node_list;
	struct hlist_head	tpg_lun_hlist;
	struct se_lun		*tpg_virt_lun0;
	/* List of TCM sessions associated wth this TPG */
	struct list_head	tpg_sess_list;
	/* Pointer to $FABRIC_MOD dependent code */
	const struct target_core_fabric_ops *se_tpg_tfo;
	struct se_wwn		*se_tpg_wwn;
	struct config_group	tpg_group;
	struct config_group	tpg_lun_group;
	struct config_group	tpg_np_group;
	struct config_group	tpg_acl_group;
	struct config_group	tpg_attrib_group;
	struct config_group	tpg_auth_group;
	struct config_group	tpg_param_group;
};

static inline struct se_portal_group *to_tpg(struct config_item *item)
{
	return container_of(to_config_group(item), struct se_portal_group,
			tpg_group);
}

static inline struct se_portal_group *attrib_to_tpg(struct config_item *item)
{
	return container_of(to_config_group(item), struct se_portal_group,
			tpg_attrib_group);
}

static inline struct se_portal_group *auth_to_tpg(struct config_item *item)
{
	return container_of(to_config_group(item), struct se_portal_group,
			tpg_auth_group);
}

static inline struct se_portal_group *param_to_tpg(struct config_item *item)
{
	return container_of(to_config_group(item), struct se_portal_group,
			tpg_param_group);
}

struct se_wwn {
	struct target_fabric_configfs *wwn_tf;
	struct config_group	wwn_group;
	struct config_group	fabric_stat_group;
};

static inline void atomic_inc_mb(atomic_t *v)
{
	smp_mb__before_atomic();
	atomic_inc(v);
	smp_mb__after_atomic();
}

static inline void atomic_dec_mb(atomic_t *v)
{
	smp_mb__before_atomic();
	atomic_dec(v);
	smp_mb__after_atomic();
}

#endif /* TARGET_CORE_BASE_H */