1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef TARGET_CORE_BASE_H
3 #define TARGET_CORE_BASE_H
4 
5 #include <linux/configfs.h>      /* struct config_group */
6 #include <linux/dma-direction.h> /* enum dma_data_direction */
7 #include <linux/sbitmap.h>
8 #include <linux/percpu-refcount.h>
9 #include <linux/semaphore.h>     /* struct semaphore */
10 #include <linux/completion.h>
11 
12 #define TARGET_CORE_VERSION		"v5.0"
13 
14 /*
15  * Maximum size of a CDB that can be stored in se_cmd without allocating
16  * memory dynamically for the CDB.
17  */
18 #define TCM_MAX_COMMAND_SIZE			32
19 /*
20  * From include/scsi/scsi_cmnd.h:SCSI_SENSE_BUFFERSIZE, currently
21  * defined 96, but the real limit is 252 (or 260 including the header)
22  */
23 #define TRANSPORT_SENSE_BUFFER			96
24 /* Used by transport_send_check_condition_and_sense() */
25 #define SPC_SENSE_KEY_OFFSET			2
26 #define SPC_ADD_SENSE_LEN_OFFSET		7
27 #define SPC_DESC_TYPE_OFFSET			8
28 #define SPC_ADDITIONAL_DESC_LEN_OFFSET		9
29 #define SPC_VALIDITY_OFFSET			10
30 #define SPC_ASC_KEY_OFFSET			12
31 #define SPC_ASCQ_KEY_OFFSET			13
32 #define TRANSPORT_IQN_LEN			224
33 /* Used by target_core_store_alua_lu_gp() and target_core_alua_lu_gp_show_attr_members() */
34 #define LU_GROUP_NAME_BUF			256
35 /* Used by core_alua_store_tg_pt_gp_info() and target_core_alua_tg_pt_gp_show_attr_members() */
36 #define TG_PT_GROUP_NAME_BUF			256
37 /* Used to parse VPD into struct t10_vpd */
38 #define VPD_TMP_BUF_SIZE			254
39 /* Used by transport_generic_cmd_sequencer() */
40 #define READ_BLOCK_LEN          		6
41 #define READ_CAP_LEN            		8
42 #define READ_POSITION_LEN       		20
43 #define INQUIRY_LEN				36
44 /* Used by transport_get_inquiry_vpd_serial() */
45 #define INQUIRY_VPD_SERIAL_LEN			254
46 /* Used by transport_get_inquiry_vpd_device_ident() */
47 #define INQUIRY_VPD_DEVICE_IDENTIFIER_LEN	254
48 
49 #define INQUIRY_VENDOR_LEN			8
50 #define INQUIRY_MODEL_LEN			16
51 #define INQUIRY_REVISION_LEN			4
52 
53 /* Attempts before moving from SHORT to LONG */
54 #define PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD	3
55 #define PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT	3  /* In milliseconds */
56 #define PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG	10 /* In milliseconds */
57 
58 #define PYX_TRANSPORT_STATUS_INTERVAL		5 /* In seconds */
59 
60 /* struct se_dev_attrib sanity values */
61 /* Default max_unmap_lba_count */
62 #define DA_MAX_UNMAP_LBA_COUNT			0
63 /* Default max_unmap_block_desc_count */
64 #define DA_MAX_UNMAP_BLOCK_DESC_COUNT		0
65 /* Default unmap_granularity */
66 #define DA_UNMAP_GRANULARITY_DEFAULT		0
67 /* Default unmap_granularity_alignment */
68 #define DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT	0
69 /* Default unmap_zeroes_data */
70 #define DA_UNMAP_ZEROES_DATA_DEFAULT		0
71 /* Default max_write_same_len, disabled by default */
72 #define DA_MAX_WRITE_SAME_LEN			0
73 /* Use a model alias based on the configfs backend device name */
74 #define DA_EMULATE_MODEL_ALIAS			0
75 /* Emulation for WriteCache and SYNCHRONIZE_CACHE */
76 #define DA_EMULATE_WRITE_CACHE			0
77 /* Emulation for TASK_ABORTED status (TAS) by default */
78 #define DA_EMULATE_TAS				1
79 /* Emulation for Thin Provisioning UNMAP using block/blk-lib.c:blkdev_issue_discard() */
80 #define DA_EMULATE_TPU				0
81 /*
82  * Emulation for Thin Provisioning WRITE_SAME w/ UNMAP=1 bit using
83  * block/blk-lib.c:blkdev_issue_discard()
84  */
85 #define DA_EMULATE_TPWS				0
86 /* Emulation for CompareAndWrite (AtomicTestandSet) by default */
87 #define DA_EMULATE_CAW				1
88 /* Emulation for 3rd Party Copy (ExtendedCopy) by default */
89 #define DA_EMULATE_3PC				1
90 /* No Emulation for PSCSI by default */
91 #define DA_EMULATE_ALUA				0
92 /* Emulate SCSI2 RESERVE/RELEASE and Persistent Reservations by default */
93 #define DA_EMULATE_PR				1
94 /* Emulation for REPORT SUPPORTED OPERATION CODES */
95 #define DA_EMULATE_RSOC				1
96 /* Enforce SCSI Initiator Port TransportID with 'ISID' for PR */
97 #define DA_ENFORCE_PR_ISIDS			1
98 /* Force SPC-3 PR Activate Persistence across Target Power Loss */
99 #define DA_FORCE_PR_APTPL			0
100 #define DA_STATUS_MAX_SECTORS_MIN		16
101 #define DA_STATUS_MAX_SECTORS_MAX		8192
102 /* By default don't report non-rotating (solid state) medium */
103 #define DA_IS_NONROT				0
104 /* Queue Algorithm Modifier default for restricted reordering in control mode page */
105 #define DA_EMULATE_REST_REORD			0
106 
107 #define SE_INQUIRY_BUF				1024
108 #define SE_MODE_PAGE_BUF			512
109 #define SE_SENSE_BUF				96
110 
111 /* struct se_hba->hba_flags */
112 enum hba_flags_table {
113 	HBA_FLAGS_INTERNAL_USE	= 0x01,
114 	HBA_FLAGS_PSCSI_MODE	= 0x02,
115 };
116 
117 /* Special transport agnostic struct se_cmd->t_states */
118 enum transport_state_table {
119 	TRANSPORT_NO_STATE	= 0,
120 	TRANSPORT_NEW_CMD	= 1,
121 	TRANSPORT_WRITE_PENDING	= 3,
122 	TRANSPORT_PROCESSING	= 5,
123 	TRANSPORT_COMPLETE	= 6,
124 	TRANSPORT_ISTATE_PROCESSING = 11,
125 	TRANSPORT_COMPLETE_QF_WP = 18,
126 	TRANSPORT_COMPLETE_QF_OK = 19,
127 	TRANSPORT_COMPLETE_QF_ERR = 20,
128 };
129 
130 /* Used for struct se_cmd->se_cmd_flags */
131 enum se_cmd_flags_table {
132 	SCF_SUPPORTED_SAM_OPCODE		= (1 << 0),
133 	SCF_TRANSPORT_TASK_SENSE		= (1 << 1),
134 	SCF_EMULATED_TASK_SENSE			= (1 << 2),
135 	SCF_SCSI_DATA_CDB			= (1 << 3),
136 	SCF_SCSI_TMR_CDB			= (1 << 4),
137 	SCF_FUA					= (1 << 5),
138 	SCF_SE_LUN_CMD				= (1 << 6),
139 	SCF_BIDI				= (1 << 7),
140 	SCF_SENT_CHECK_CONDITION		= (1 << 8),
141 	SCF_OVERFLOW_BIT			= (1 << 9),
142 	SCF_UNDERFLOW_BIT			= (1 << 10),
143 	SCF_ALUA_NON_OPTIMIZED			= (1 << 11),
144 	SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC	= (1 << 12),
145 	SCF_COMPARE_AND_WRITE			= (1 << 13),
146 	SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC	= (1 << 14),
147 	SCF_ACK_KREF				= (1 << 15),
148 	SCF_USE_CPUID				= (1 << 16),
149 	SCF_TASK_ATTR_SET			= (1 << 17),
150 	SCF_TREAT_READ_AS_NORMAL		= (1 << 18),
151 };
152 
153 /*
154  * Used by transport_send_check_condition_and_sense()
155  * to signal which ASC/ASCQ sense payload should be built.
156  */
157 typedef unsigned __bitwise sense_reason_t;
158 
159 enum tcm_sense_reason_table {
160 #define R(x)	(__force sense_reason_t )(x)
161 	TCM_NO_SENSE				= R(0x00),
162 	TCM_NON_EXISTENT_LUN			= R(0x01),
163 	TCM_UNSUPPORTED_SCSI_OPCODE		= R(0x02),
164 	TCM_INCORRECT_AMOUNT_OF_DATA		= R(0x03),
165 	TCM_UNEXPECTED_UNSOLICITED_DATA		= R(0x04),
166 	TCM_SERVICE_CRC_ERROR			= R(0x05),
167 	TCM_SNACK_REJECTED			= R(0x06),
168 	TCM_SECTOR_COUNT_TOO_MANY		= R(0x07),
169 	TCM_INVALID_CDB_FIELD			= R(0x08),
170 	TCM_INVALID_PARAMETER_LIST		= R(0x09),
171 	TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE	= R(0x0a),
172 	TCM_UNKNOWN_MODE_PAGE			= R(0x0b),
173 	TCM_WRITE_PROTECTED			= R(0x0c),
174 	TCM_CHECK_CONDITION_ABORT_CMD		= R(0x0d),
175 	TCM_CHECK_CONDITION_UNIT_ATTENTION	= R(0x0e),
176 
177 	TCM_RESERVATION_CONFLICT		= R(0x10),
178 	TCM_ADDRESS_OUT_OF_RANGE		= R(0x11),
179 	TCM_OUT_OF_RESOURCES			= R(0x12),
180 	TCM_PARAMETER_LIST_LENGTH_ERROR		= R(0x13),
181 	TCM_MISCOMPARE_VERIFY			= R(0x14),
182 	TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED	= R(0x15),
183 	TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED	= R(0x16),
184 	TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED	= R(0x17),
185 	TCM_COPY_TARGET_DEVICE_NOT_REACHABLE	= R(0x18),
186 	TCM_TOO_MANY_TARGET_DESCS		= R(0x19),
187 	TCM_UNSUPPORTED_TARGET_DESC_TYPE_CODE	= R(0x1a),
188 	TCM_TOO_MANY_SEGMENT_DESCS		= R(0x1b),
189 	TCM_UNSUPPORTED_SEGMENT_DESC_TYPE_CODE	= R(0x1c),
190 	TCM_INSUFFICIENT_REGISTRATION_RESOURCES	= R(0x1d),
191 	TCM_LUN_BUSY				= R(0x1e),
192 	TCM_INVALID_FIELD_IN_COMMAND_IU         = R(0x1f),
193 	TCM_ALUA_TG_PT_STANDBY			= R(0x20),
194 	TCM_ALUA_TG_PT_UNAVAILABLE		= R(0x21),
195 	TCM_ALUA_STATE_TRANSITION		= R(0x22),
196 	TCM_ALUA_OFFLINE			= R(0x23),
197 #undef R
198 };
199 
200 enum target_sc_flags_table {
201 	TARGET_SCF_BIDI_OP		= 0x01,
202 	TARGET_SCF_ACK_KREF		= 0x02,
203 	TARGET_SCF_UNKNOWN_SIZE		= 0x04,
204 	TARGET_SCF_USE_CPUID		= 0x08,
205 };
206 
207 /* fabric independent task management function values */
208 enum tcm_tmreq_table {
209 	TMR_ABORT_TASK		= 1,
210 	TMR_ABORT_TASK_SET	= 2,
211 	TMR_CLEAR_ACA		= 3,
212 	TMR_CLEAR_TASK_SET	= 4,
213 	TMR_LUN_RESET		= 5,
214 	TMR_TARGET_WARM_RESET	= 6,
215 	TMR_TARGET_COLD_RESET	= 7,
216 	TMR_LUN_RESET_PRO	= 0x80,
217 	TMR_UNKNOWN		= 0xff,
218 };
219 
220 /* fabric independent task management response values */
221 enum tcm_tmrsp_table {
222 	TMR_FUNCTION_FAILED		= 0,
223 	TMR_FUNCTION_COMPLETE		= 1,
224 	TMR_TASK_DOES_NOT_EXIST		= 2,
225 	TMR_LUN_DOES_NOT_EXIST		= 3,
226 	TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED	= 4,
227 	TMR_FUNCTION_REJECTED		= 5,
228 };
229 
230 /*
231  * Used for target SCSI statistics
232  */
233 typedef enum {
234 	SCSI_INST_INDEX,
235 	SCSI_AUTH_INTR_INDEX,
236 	SCSI_INDEX_TYPE_MAX
237 } scsi_index_t;
238 
239 struct se_cmd;
240 
241 struct t10_alua_lba_map_member {
242 	struct list_head lba_map_mem_list;
243 	int lba_map_mem_alua_state;
244 	int lba_map_mem_alua_pg_id;
245 };
246 
247 struct t10_alua_lba_map {
248 	u64 lba_map_first_lba;
249 	u64 lba_map_last_lba;
250 	struct list_head lba_map_list;
251 	struct list_head lba_map_mem_list;
252 };
253 
254 struct t10_alua {
255 	/* ALUA Target Port Group ID */
256 	u16	alua_tg_pt_gps_counter;
257 	u32	alua_tg_pt_gps_count;
258 	/* Referrals support */
259 	spinlock_t lba_map_lock;
260 	u32     lba_map_segment_size;
261 	u32     lba_map_segment_multiplier;
262 	struct list_head lba_map_list;
263 	spinlock_t tg_pt_gps_lock;
264 	struct se_device *t10_dev;
265 	/* Used for default ALUA Target Port Group */
266 	struct t10_alua_tg_pt_gp *default_tg_pt_gp;
267 	/* Used for default ALUA Target Port Group ConfigFS group */
268 	struct config_group alua_tg_pt_gps_group;
269 	struct list_head tg_pt_gps_list;
270 };
271 
272 struct t10_alua_lu_gp {
273 	u16	lu_gp_id;
274 	int	lu_gp_valid_id;
275 	u32	lu_gp_members;
276 	atomic_t lu_gp_ref_cnt;
277 	spinlock_t lu_gp_lock;
278 	struct config_group lu_gp_group;
279 	struct list_head lu_gp_node;
280 	struct list_head lu_gp_mem_list;
281 };
282 
283 struct t10_alua_lu_gp_member {
284 	bool lu_gp_assoc;
285 	atomic_t lu_gp_mem_ref_cnt;
286 	spinlock_t lu_gp_mem_lock;
287 	struct t10_alua_lu_gp *lu_gp;
288 	struct se_device *lu_gp_mem_dev;
289 	struct list_head lu_gp_mem_list;
290 };
291 
292 struct t10_alua_tg_pt_gp {
293 	u16	tg_pt_gp_id;
294 	int	tg_pt_gp_valid_id;
295 	int	tg_pt_gp_alua_supported_states;
296 	int	tg_pt_gp_alua_access_status;
297 	int	tg_pt_gp_alua_access_type;
298 	int	tg_pt_gp_nonop_delay_msecs;
299 	int	tg_pt_gp_trans_delay_msecs;
300 	int	tg_pt_gp_implicit_trans_secs;
301 	int	tg_pt_gp_pref;
302 	int	tg_pt_gp_write_metadata;
303 	u32	tg_pt_gp_members;
304 	int	tg_pt_gp_alua_access_state;
305 	atomic_t tg_pt_gp_ref_cnt;
306 	spinlock_t tg_pt_gp_lock;
307 	struct mutex tg_pt_gp_transition_mutex;
308 	struct se_device *tg_pt_gp_dev;
309 	struct config_group tg_pt_gp_group;
310 	struct list_head tg_pt_gp_list;
311 	struct list_head tg_pt_gp_lun_list;
312 	struct se_lun *tg_pt_gp_alua_lun;
313 	struct se_node_acl *tg_pt_gp_alua_nacl;
314 };
315 
316 struct t10_vpd {
317 	unsigned char device_identifier[INQUIRY_VPD_DEVICE_IDENTIFIER_LEN];
318 	int protocol_identifier_set;
319 	u32 protocol_identifier;
320 	u32 device_identifier_code_set;
321 	u32 association;
322 	u32 device_identifier_type;
323 	struct list_head vpd_list;
324 };
325 
326 struct t10_wwn {
327 	/*
328 	 * SCSI left aligned strings may not be null terminated. +1 to ensure a
329 	 * null terminator is always present.
330 	 */
331 	char vendor[INQUIRY_VENDOR_LEN + 1];
332 	char model[INQUIRY_MODEL_LEN + 1];
333 	char revision[INQUIRY_REVISION_LEN + 1];
334 	char unit_serial[INQUIRY_VPD_SERIAL_LEN];
335 	u32 company_id;
336 	spinlock_t t10_vpd_lock;
337 	struct se_device *t10_dev;
338 	struct config_group t10_wwn_group;
339 	struct list_head t10_vpd_list;
340 };
341 
342 struct t10_pr_registration {
343 	/* Used for fabrics that contain WWN+ISID */
344 #define PR_REG_ISID_LEN				16
345 	/* PR_REG_ISID_LEN + ',i,0x' */
346 #define PR_REG_ISID_ID_LEN			(PR_REG_ISID_LEN + 5)
347 	char pr_reg_isid[PR_REG_ISID_LEN];
348 	/* Used during APTPL metadata reading */
349 #define PR_APTPL_MAX_IPORT_LEN			256
350 	unsigned char pr_iport[PR_APTPL_MAX_IPORT_LEN];
351 	/* Used during APTPL metadata reading */
352 #define PR_APTPL_MAX_TPORT_LEN			256
353 	unsigned char pr_tport[PR_APTPL_MAX_TPORT_LEN];
354 	u16 pr_aptpl_rpti;
355 	u16 pr_reg_tpgt;
356 	/* Reservation effects all target ports */
357 	int pr_reg_all_tg_pt;
358 	/* Activate Persistence across Target Power Loss */
359 	int pr_reg_aptpl;
360 	int pr_res_holder;
361 	int pr_res_type;
362 	int pr_res_scope;
363 	/* Used for fabric initiator WWPNs using a ISID */
364 	bool isid_present_at_reg;
365 	u64 pr_res_mapped_lun;
366 	u64 pr_aptpl_target_lun;
367 	u16 tg_pt_sep_rtpi;
368 	u32 pr_res_generation;
369 	u64 pr_reg_bin_isid;
370 	u64 pr_res_key;
371 	atomic_t pr_res_holders;
372 	struct se_node_acl *pr_reg_nacl;
373 	/* Used by ALL_TG_PT=1 registration with deve->pr_ref taken */
374 	struct se_dev_entry *pr_reg_deve;
375 	struct list_head pr_reg_list;
376 	struct list_head pr_reg_abort_list;
377 	struct list_head pr_reg_aptpl_list;
378 	struct list_head pr_reg_atp_list;
379 	struct list_head pr_reg_atp_mem_list;
380 };
381 
382 struct t10_reservation {
383 	/* Reservation effects all target ports */
384 	int pr_all_tg_pt;
385 	/* Activate Persistence across Target Power Loss enabled
386 	 * for SCSI device */
387 	int pr_aptpl_active;
388 #define PR_APTPL_BUF_LEN			262144
389 	u32 pr_generation;
390 	spinlock_t registration_lock;
391 	spinlock_t aptpl_reg_lock;
392 	/*
393 	 * This will always be set by one individual I_T Nexus.
394 	 * However with all_tg_pt=1, other I_T Nexus from the
395 	 * same initiator can access PR reg/res info on a different
396 	 * target port.
397 	 *
398 	 * There is also the 'All Registrants' case, where there is
399 	 * a single *pr_res_holder of the reservation, but all
400 	 * registrations are considered reservation holders.
401 	 */
402 	struct se_node_acl *pr_res_holder;
403 	struct list_head registration_list;
404 	struct list_head aptpl_reg_list;
405 };
406 
407 struct se_tmr_req {
408 	/* Task Management function to be performed */
409 	u8			function;
410 	/* Task Management response to send */
411 	u8			response;
412 	int			call_transport;
413 	/* Reference to ITT that Task Mgmt should be performed */
414 	u64			ref_task_tag;
415 	void 			*fabric_tmr_ptr;
416 	struct se_cmd		*task_cmd;
417 	struct se_device	*tmr_dev;
418 	struct list_head	tmr_list;
419 };
420 
421 enum target_prot_op {
422 	TARGET_PROT_NORMAL	= 0,
423 	TARGET_PROT_DIN_INSERT	= (1 << 0),
424 	TARGET_PROT_DOUT_INSERT	= (1 << 1),
425 	TARGET_PROT_DIN_STRIP	= (1 << 2),
426 	TARGET_PROT_DOUT_STRIP	= (1 << 3),
427 	TARGET_PROT_DIN_PASS	= (1 << 4),
428 	TARGET_PROT_DOUT_PASS	= (1 << 5),
429 };
430 
431 #define TARGET_PROT_ALL	TARGET_PROT_DIN_INSERT | TARGET_PROT_DOUT_INSERT | \
432 			TARGET_PROT_DIN_STRIP | TARGET_PROT_DOUT_STRIP | \
433 			TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS
434 
435 enum target_prot_type {
436 	TARGET_DIF_TYPE0_PROT,
437 	TARGET_DIF_TYPE1_PROT,
438 	TARGET_DIF_TYPE2_PROT,
439 	TARGET_DIF_TYPE3_PROT,
440 };
441 
442 /* Emulation for UNIT ATTENTION Interlock Control */
443 enum target_ua_intlck_ctrl {
444 	TARGET_UA_INTLCK_CTRL_CLEAR = 0,
445 	TARGET_UA_INTLCK_CTRL_NO_CLEAR = 1,
446 	TARGET_UA_INTLCK_CTRL_ESTABLISH_UA = 2,
447 };
448 
449 enum target_core_dif_check {
450 	TARGET_DIF_CHECK_GUARD  = 0x1 << 0,
451 	TARGET_DIF_CHECK_APPTAG = 0x1 << 1,
452 	TARGET_DIF_CHECK_REFTAG = 0x1 << 2,
453 };
454 
455 /* for sam_task_attr */
456 #define TCM_SIMPLE_TAG	0x20
457 #define TCM_HEAD_TAG	0x21
458 #define TCM_ORDERED_TAG	0x22
459 #define TCM_ACA_TAG	0x24
460 
461 struct se_cmd {
462 	/* Used for fail with specific sense codes */
463 	sense_reason_t		sense_reason;
464 	/* SAM response code being sent to initiator */
465 	u8			scsi_status;
466 	u16			scsi_sense_length;
467 	unsigned		unknown_data_length:1;
468 	bool			state_active:1;
469 	u64			tag; /* SAM command identifier aka task tag */
470 	/* Delay for ALUA Active/NonOptimized state access in milliseconds */
471 	int			alua_nonop_delay;
472 	/* See include/linux/dma-mapping.h */
473 	enum dma_data_direction	data_direction;
474 	/* For SAM Task Attribute */
475 	int			sam_task_attr;
476 	/* Used for se_sess->sess_tag_pool */
477 	unsigned int		map_tag;
478 	int			map_cpu;
479 	/* Transport protocol dependent state, see transport_state_table */
480 	enum transport_state_table t_state;
481 	/* See se_cmd_flags_table */
482 	u32			se_cmd_flags;
483 	/* Total size in bytes associated with command */
484 	u32			data_length;
485 	u32			residual_count;
486 	u64			orig_fe_lun;
487 	/* Persistent Reservation key */
488 	u64			pr_res_key;
489 	/* Used for sense data */
490 	void			*sense_buffer;
491 	struct list_head	se_delayed_node;
492 	struct list_head	se_qf_node;
493 	struct se_device      *se_dev;
494 	struct se_lun		*se_lun;
495 	/* Only used for internal passthrough and legacy TCM fabric modules */
496 	struct se_session	*se_sess;
497 	struct target_cmd_counter *cmd_cnt;
498 	struct se_tmr_req	*se_tmr_req;
499 	struct llist_node	se_cmd_list;
500 	struct completion	*free_compl;
501 	struct completion	*abrt_compl;
502 	const struct target_core_fabric_ops *se_tfo;
503 	sense_reason_t		(*execute_cmd)(struct se_cmd *);
504 	sense_reason_t (*transport_complete_callback)(struct se_cmd *, bool, int *);
505 	void			*protocol_data;
506 
507 	unsigned char		*t_task_cdb;
508 	unsigned char		__t_task_cdb[TCM_MAX_COMMAND_SIZE];
509 	unsigned long long	t_task_lba;
510 	unsigned int		t_task_nolb;
511 	unsigned int		transport_state;
512 #define CMD_T_ABORTED		(1 << 0)
513 #define CMD_T_ACTIVE		(1 << 1)
514 #define CMD_T_COMPLETE		(1 << 2)
515 #define CMD_T_SENT		(1 << 4)
516 #define CMD_T_STOP		(1 << 5)
517 #define CMD_T_TAS		(1 << 10)
518 #define CMD_T_FABRIC_STOP	(1 << 11)
519 	spinlock_t		t_state_lock;
520 	struct kref		cmd_kref;
521 	struct completion	t_transport_stop_comp;
522 
523 	struct work_struct	work;
524 
525 	struct scatterlist	*t_data_sg;
526 	struct scatterlist	*t_data_sg_orig;
527 	unsigned int		t_data_nents;
528 	unsigned int		t_data_nents_orig;
529 	void			*t_data_vmap;
530 	struct scatterlist	*t_bidi_data_sg;
531 	unsigned int		t_bidi_data_nents;
532 
533 	/* Used for lun->lun_ref counting */
534 	int			lun_ref_active;
535 
536 	struct list_head	state_list;
537 
538 	/* backend private data */
539 	void			*priv;
540 
541 	/* DIF related members */
542 	enum target_prot_op	prot_op;
543 	enum target_prot_type	prot_type;
544 	u8			prot_checks;
545 	bool			prot_pto;
546 	u32			prot_length;
547 	u32			reftag_seed;
548 	struct scatterlist	*t_prot_sg;
549 	unsigned int		t_prot_nents;
550 	sense_reason_t		pi_err;
551 	u64			sense_info;
552 	/*
553 	 * CPU LIO will execute the cmd on. Defaults to the CPU the cmd is
554 	 * initialized on. Drivers can override.
555 	 */
556 	int			cpuid;
557 };
558 
559 struct se_ua {
560 	u8			ua_asc;
561 	u8			ua_ascq;
562 	struct list_head	ua_nacl_list;
563 };
564 
565 struct se_node_acl {
566 	char			initiatorname[TRANSPORT_IQN_LEN];
567 	/* Used to signal demo mode created ACL, disabled by default */
568 	bool			dynamic_node_acl;
569 	bool			dynamic_stop;
570 	u32			queue_depth;
571 	u32			acl_index;
572 	enum target_prot_type	saved_prot_type;
573 #define MAX_ACL_TAG_SIZE 64
574 	char			acl_tag[MAX_ACL_TAG_SIZE];
575 	/* Used for PR SPEC_I_PT=1 and REGISTER_AND_MOVE */
576 	atomic_t		acl_pr_ref_count;
577 	struct hlist_head	lun_entry_hlist;
578 	struct se_session	*nacl_sess;
579 	struct se_portal_group *se_tpg;
580 	struct mutex		lun_entry_mutex;
581 	spinlock_t		nacl_sess_lock;
582 	struct config_group	acl_group;
583 	struct config_group	acl_attrib_group;
584 	struct config_group	acl_auth_group;
585 	struct config_group	acl_param_group;
586 	struct config_group	acl_fabric_stat_group;
587 	struct list_head	acl_list;
588 	struct list_head	acl_sess_list;
589 	struct completion	acl_free_comp;
590 	struct kref		acl_kref;
591 };
592 
593 static inline struct se_node_acl *acl_to_nacl(struct config_item *item)
594 {
595 	return container_of(to_config_group(item), struct se_node_acl,
596 			acl_group);
597 }
598 
599 static inline struct se_node_acl *attrib_to_nacl(struct config_item *item)
600 {
601 	return container_of(to_config_group(item), struct se_node_acl,
602 			acl_attrib_group);
603 }
604 
605 static inline struct se_node_acl *auth_to_nacl(struct config_item *item)
606 {
607 	return container_of(to_config_group(item), struct se_node_acl,
608 			acl_auth_group);
609 }
610 
611 static inline struct se_node_acl *param_to_nacl(struct config_item *item)
612 {
613 	return container_of(to_config_group(item), struct se_node_acl,
614 			acl_param_group);
615 }
616 
617 static inline struct se_node_acl *fabric_stat_to_nacl(struct config_item *item)
618 {
619 	return container_of(to_config_group(item), struct se_node_acl,
620 			acl_fabric_stat_group);
621 }
622 
623 struct target_cmd_counter {
624 	struct percpu_ref	refcnt;
625 	wait_queue_head_t	refcnt_wq;
626 	struct completion	stop_done;
627 	atomic_t		stopped;
628 };
629 
630 struct se_session {
631 	u64			sess_bin_isid;
632 	enum target_prot_op	sup_prot_ops;
633 	enum target_prot_type	sess_prot_type;
634 	struct se_node_acl	*se_node_acl;
635 	struct se_portal_group *se_tpg;
636 	void			*fabric_sess_ptr;
637 	struct list_head	sess_list;
638 	struct list_head	sess_acl_list;
639 	spinlock_t		sess_cmd_lock;
640 	void			*sess_cmd_map;
641 	struct sbitmap_queue	sess_tag_pool;
642 	struct target_cmd_counter *cmd_cnt;
643 };
644 
645 struct se_device;
646 struct se_transform_info;
647 struct scatterlist;
648 
649 struct se_ml_stat_grps {
650 	struct config_group	stat_group;
651 	struct config_group	scsi_auth_intr_group;
652 	struct config_group	scsi_att_intr_port_group;
653 };
654 
655 struct se_lun_acl {
656 	u64			mapped_lun;
657 	struct se_node_acl	*se_lun_nacl;
658 	struct se_lun		*se_lun;
659 	struct config_group	se_lun_group;
660 	struct se_ml_stat_grps	ml_stat_grps;
661 };
662 
663 struct se_dev_entry {
664 	u64			mapped_lun;
665 	u64			pr_res_key;
666 	u64			creation_time;
667 	bool			lun_access_ro;
668 	u32			attach_count;
669 	atomic_long_t		total_cmds;
670 	atomic_long_t		read_bytes;
671 	atomic_long_t		write_bytes;
672 	/* Used for PR SPEC_I_PT=1 and REGISTER_AND_MOVE */
673 	struct kref		pr_kref;
674 	struct completion	pr_comp;
675 	struct se_lun_acl	*se_lun_acl;
676 	spinlock_t		ua_lock;
677 	struct se_lun		*se_lun;
678 #define DEF_PR_REG_ACTIVE		1
679 	unsigned long		deve_flags;
680 	struct list_head	alua_port_list;
681 	struct list_head	lun_link;
682 	struct list_head	ua_list;
683 	struct hlist_node	link;
684 	struct rcu_head		rcu_head;
685 };
686 
687 struct se_dev_attrib {
688 	bool		emulate_model_alias;
689 	bool		emulate_dpo;		/* deprecated */
690 	bool		emulate_fua_write;
691 	bool		emulate_fua_read;	/* deprecated */
692 	bool		emulate_write_cache;
693 	enum target_ua_intlck_ctrl emulate_ua_intlck_ctrl;
694 	bool		emulate_tas;
695 	bool		emulate_tpu;
696 	bool		emulate_tpws;
697 	bool		emulate_caw;
698 	bool		emulate_3pc;
699 	bool		emulate_pr;
700 	bool		emulate_rsoc;
701 	enum target_prot_type pi_prot_type;
702 	enum target_prot_type hw_pi_prot_type;
703 	bool		pi_prot_verify;
704 	bool		enforce_pr_isids;
705 	bool		force_pr_aptpl;
706 	bool		is_nonrot;
707 	bool		emulate_rest_reord;
708 	bool		unmap_zeroes_data;
709 	u32		hw_block_size;
710 	u32		block_size;
711 	u32		hw_max_sectors;
712 	u32		optimal_sectors;
713 	u32		hw_queue_depth;
714 	u32		queue_depth;
715 	u32		max_unmap_lba_count;
716 	u32		max_unmap_block_desc_count;
717 	u32		unmap_granularity;
718 	u32		unmap_granularity_alignment;
719 	u32		max_write_same_len;
720 	struct se_device *da_dev;
721 	struct config_group da_group;
722 };
723 
724 struct se_port_stat_grps {
725 	struct config_group stat_group;
726 	struct config_group scsi_port_group;
727 	struct config_group scsi_tgt_port_group;
728 	struct config_group scsi_transport_group;
729 };
730 
731 struct scsi_port_stats {
732 	atomic_long_t	cmd_pdus;
733 	atomic_long_t	tx_data_octets;
734 	atomic_long_t	rx_data_octets;
735 };
736 
737 struct se_lun {
738 	u64			unpacked_lun;
739 	bool			lun_shutdown;
740 	bool			lun_access_ro;
741 	u32			lun_index;
742 
743 	atomic_t		lun_acl_count;
744 	struct se_device __rcu	*lun_se_dev;
745 
746 	struct list_head	lun_deve_list;
747 	spinlock_t		lun_deve_lock;
748 
749 	/* ALUA state */
750 	int			lun_tg_pt_secondary_stat;
751 	int			lun_tg_pt_secondary_write_md;
752 	atomic_t		lun_tg_pt_secondary_offline;
753 	struct mutex		lun_tg_pt_md_mutex;
754 
755 	/* ALUA target port group linkage */
756 	struct list_head	lun_tg_pt_gp_link;
757 	struct t10_alua_tg_pt_gp __rcu *lun_tg_pt_gp;
758 	spinlock_t		lun_tg_pt_gp_lock;
759 
760 	struct se_portal_group	*lun_tpg;
761 	struct scsi_port_stats	lun_stats;
762 	struct config_group	lun_group;
763 	struct se_port_stat_grps port_stat_grps;
764 	struct completion	lun_shutdown_comp;
765 	struct percpu_ref	lun_ref;
766 	struct list_head	lun_dev_link;
767 	struct hlist_node	link;
768 	struct rcu_head		rcu_head;
769 };
770 
771 struct se_dev_stat_grps {
772 	struct config_group stat_group;
773 	struct config_group scsi_dev_group;
774 	struct config_group scsi_tgt_dev_group;
775 	struct config_group scsi_lu_group;
776 };
777 
778 struct se_cmd_queue {
779 	struct llist_head	cmd_list;
780 	struct work_struct	work;
781 };
782 
783 struct se_dev_plug {
784 	struct se_device	*se_dev;
785 };
786 
787 struct se_device_queue {
788 	struct list_head	state_list;
789 	spinlock_t		lock;
790 	struct se_cmd_queue	sq;
791 };
792 
793 struct se_device {
794 	/* Used for SAM Task Attribute ordering */
795 	u32			dev_cur_ordered_id;
796 	u32			dev_flags;
797 #define DF_CONFIGURED				0x00000001
798 #define DF_FIRMWARE_VPD_UNIT_SERIAL		0x00000002
799 #define DF_EMULATED_VPD_UNIT_SERIAL		0x00000004
800 #define DF_USING_UDEV_PATH			0x00000008
801 #define DF_USING_ALIAS				0x00000010
802 #define DF_READ_ONLY				0x00000020
803 	u8			transport_flags;
804 	/* Physical device queue depth */
805 	u32			queue_depth;
806 	/* Used for SPC-2 reservations enforce of ISIDs */
807 	u64			dev_res_bin_isid;
808 	/* Pointer to transport specific device structure */
809 	u32			dev_index;
810 	u64			creation_time;
811 	atomic_long_t		num_resets;
812 	atomic_long_t		aborts_complete;
813 	atomic_long_t		aborts_no_task;
814 	atomic_long_t		num_cmds;
815 	atomic_long_t		read_bytes;
816 	atomic_long_t		write_bytes;
817 	/* Active commands on this virtual SE device */
818 	atomic_t		non_ordered;
819 	bool			ordered_sync_in_progress;
820 	atomic_t		delayed_cmd_count;
821 	atomic_t		dev_qf_count;
822 	u32			export_count;
823 	spinlock_t		delayed_cmd_lock;
824 	spinlock_t		dev_reservation_lock;
825 	unsigned int		dev_reservation_flags;
826 #define DRF_SPC2_RESERVATIONS			0x00000001
827 #define DRF_SPC2_RESERVATIONS_WITH_ISID		0x00000002
828 	spinlock_t		se_port_lock;
829 	spinlock_t		se_tmr_lock;
830 	spinlock_t		qf_cmd_lock;
831 	struct semaphore	caw_sem;
832 	/* Used for legacy SPC-2 reservations */
833 	struct se_session	*reservation_holder;
834 	/* Used for ALUA Logical Unit Group membership */
835 	struct t10_alua_lu_gp_member *dev_alua_lu_gp_mem;
836 	/* Used for SPC-3 Persistent Reservations */
837 	struct t10_pr_registration *dev_pr_res_holder;
838 	struct list_head	dev_sep_list;
839 	struct list_head	dev_tmr_list;
840 	struct work_struct	qf_work_queue;
841 	struct work_struct	delayed_cmd_work;
842 	struct list_head	delayed_cmd_list;
843 	struct list_head	qf_cmd_list;
844 	/* Pointer to associated SE HBA */
845 	struct se_hba		*se_hba;
846 	/* T10 Inquiry and VPD WWN Information */
847 	struct t10_wwn		t10_wwn;
848 	/* T10 Asymmetric Logical Unit Assignment for Target Ports */
849 	struct t10_alua		t10_alua;
850 	/* T10 SPC-2 + SPC-3 Reservations */
851 	struct t10_reservation	t10_pr;
852 	struct se_dev_attrib	dev_attrib;
853 	struct config_group	dev_action_group;
854 	struct config_group	dev_group;
855 	struct config_group	dev_pr_group;
856 	struct se_dev_stat_grps dev_stat_grps;
857 #define SE_DEV_ALIAS_LEN 512		/* must be less than PAGE_SIZE */
858 	unsigned char		dev_alias[SE_DEV_ALIAS_LEN];
859 #define SE_UDEV_PATH_LEN 512		/* must be less than PAGE_SIZE */
860 	unsigned char		udev_path[SE_UDEV_PATH_LEN];
861 	/* Pointer to template of function pointers for transport */
862 	const struct target_backend_ops *transport;
863 	struct se_lun		xcopy_lun;
864 	/* Protection Information */
865 	int			prot_length;
866 	/* For se_lun->lun_se_dev RCU read-side critical access */
867 	u32			hba_index;
868 	struct rcu_head		rcu_head;
869 	int			queue_cnt;
870 	struct se_device_queue	*queues;
871 	struct mutex		lun_reset_mutex;
872 };
873 
874 struct target_opcode_descriptor {
875 	u8			support:3;
876 	u8			serv_action_valid:1;
877 	u8			opcode;
878 	u16			service_action;
879 	u32			cdb_size;
880 	u8			specific_timeout;
881 	u16			nominal_timeout;
882 	u16			recommended_timeout;
883 	bool			(*enabled)(struct se_cmd *cmd);
884 	void			(*update_usage_bits)(u8 *usage_bits,
885 						     struct se_device *dev);
886 	u8			usage_bits[];
887 };
888 
889 struct se_hba {
890 	u16			hba_tpgt;
891 	u32			hba_id;
892 	/* See hba_flags_table */
893 	u32			hba_flags;
894 	/* Virtual iSCSI devices attached. */
895 	u32			dev_count;
896 	u32			hba_index;
897 	/* Pointer to transport specific host structure. */
898 	void			*hba_ptr;
899 	struct list_head	hba_node;
900 	spinlock_t		device_lock;
901 	struct config_group	hba_group;
902 	struct mutex		hba_access_mutex;
903 	struct target_backend	*backend;
904 };
905 
906 struct se_tpg_np {
907 	struct se_portal_group *tpg_np_parent;
908 	struct config_group	tpg_np_group;
909 };
910 
911 static inline struct se_tpg_np *to_tpg_np(struct config_item *item)
912 {
913 	return container_of(to_config_group(item), struct se_tpg_np,
914 			tpg_np_group);
915 }
916 
917 struct se_portal_group {
918 	/*
919 	 * PROTOCOL IDENTIFIER value per SPC4, 7.5.1.
920 	 *
921 	 * Negative values can be used by fabric drivers for internal use TPGs.
922 	 */
923 	int			proto_id;
924 	bool			enabled;
925 	/* RELATIVE TARGET PORT IDENTIFIER */
926 	u16			tpg_rtpi;
927 	bool			rtpi_manual;
928 	/* Used for PR SPEC_I_PT=1 and REGISTER_AND_MOVE */
929 	atomic_t		tpg_pr_ref_count;
930 	/* Spinlock for adding/removing ACLed Nodes */
931 	struct mutex		acl_node_mutex;
932 	/* Spinlock for adding/removing sessions */
933 	spinlock_t		session_lock;
934 	struct mutex		tpg_lun_mutex;
935 	/* linked list for initiator ACL list */
936 	struct list_head	acl_node_list;
937 	struct hlist_head	tpg_lun_hlist;
938 	struct se_lun		*tpg_virt_lun0;
939 	/* List of TCM sessions associated wth this TPG */
940 	struct list_head	tpg_sess_list;
941 	/* Pointer to $FABRIC_MOD dependent code */
942 	const struct target_core_fabric_ops *se_tpg_tfo;
943 	struct se_wwn		*se_tpg_wwn;
944 	struct config_group	tpg_group;
945 	struct config_group	tpg_lun_group;
946 	struct config_group	tpg_np_group;
947 	struct config_group	tpg_acl_group;
948 	struct config_group	tpg_attrib_group;
949 	struct config_group	tpg_auth_group;
950 	struct config_group	tpg_param_group;
951 };
952 
953 static inline struct se_portal_group *to_tpg(struct config_item *item)
954 {
955 	return container_of(to_config_group(item), struct se_portal_group,
956 			tpg_group);
957 }
958 
959 static inline struct se_portal_group *attrib_to_tpg(struct config_item *item)
960 {
961 	return container_of(to_config_group(item), struct se_portal_group,
962 			tpg_attrib_group);
963 }
964 
965 static inline struct se_portal_group *auth_to_tpg(struct config_item *item)
966 {
967 	return container_of(to_config_group(item), struct se_portal_group,
968 			tpg_auth_group);
969 }
970 
971 static inline struct se_portal_group *param_to_tpg(struct config_item *item)
972 {
973 	return container_of(to_config_group(item), struct se_portal_group,
974 			tpg_param_group);
975 }
976 
977 enum {
978 	/* Use se_cmd's cpuid for completion */
979 	SE_COMPL_AFFINITY_CPUID		= -1,
980 	/* Complete on current CPU */
981 	SE_COMPL_AFFINITY_CURR_CPU	= -2,
982 };
983 
984 struct se_wwn {
985 	struct target_fabric_configfs *wwn_tf;
986 	void			*priv;
987 	struct config_group	wwn_group;
988 	struct config_group	fabric_stat_group;
989 	struct config_group	param_group;
990 	int			cmd_compl_affinity;
991 };
992 
993 static inline void atomic_inc_mb(atomic_t *v)
994 {
995 	smp_mb__before_atomic();
996 	atomic_inc(v);
997 	smp_mb__after_atomic();
998 }
999 
1000 static inline void atomic_dec_mb(atomic_t *v)
1001 {
1002 	smp_mb__before_atomic();
1003 	atomic_dec(v);
1004 	smp_mb__after_atomic();
1005 }
1006 
1007 static inline void target_free_tag(struct se_session *sess, struct se_cmd *cmd)
1008 {
1009 	sbitmap_queue_clear(&sess->sess_tag_pool, cmd->map_tag, cmd->map_cpu);
1010 }
1011 
1012 #endif /* TARGET_CORE_BASE_H */
1013