include/target/target_core_base.h

   1 #ifndef TARGET_CORE_BASE_H
   2 #define TARGET_CORE_BASE_H
   3
   4 #include <linux/in.h>
   5 #include <linux/configfs.h>
   6 #include <linux/dma-mapping.h>
   7 #include <linux/blkdev.h>
   8 #include <linux/percpu_ida.h>
   9 #include <net/sock.h>
  10 #include <net/tcp.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 /* Attempts before moving from SHORT to LONG */
  50 #define PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD   3
  51 #define PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT  3  /* In milliseconds */
  52 #define PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG   10 /* In milliseconds */
  53
  54 #define PYX_TRANSPORT_STATUS_INTERVAL           5 /* In seconds */
  55
  56 /* struct se_dev_attrib sanity values */
  57 /* Default max_unmap_lba_count */
  58 #define DA_MAX_UNMAP_LBA_COUNT                  0
  59 /* Default max_unmap_block_desc_count */
  60 #define DA_MAX_UNMAP_BLOCK_DESC_COUNT           0
  61 /* Default unmap_granularity */
  62 #define DA_UNMAP_GRANULARITY_DEFAULT            0
  63 /* Default unmap_granularity_alignment */
  64 #define DA_UNMAP_GRANULARITY_ALIGNMENT_DEFAULT  0
  65 /* Default max_write_same_len, disabled by default */
  66 #define DA_MAX_WRITE_SAME_LEN                   0
  67 /* Use a model alias based on the configfs backend device name */
  68 #define DA_EMULATE_MODEL_ALIAS                  0
  69 /* Emulation for WriteCache and SYNCHRONIZE_CACHE */
  70 #define DA_EMULATE_WRITE_CACHE                  0
  71 /* Emulation for UNIT ATTENTION Interlock Control */
  72 #define DA_EMULATE_UA_INTLLCK_CTRL              0
  73 /* Emulation for TASK_ABORTED status (TAS) by default */
  74 #define DA_EMULATE_TAS                          1
  75 /* Emulation for Thin Provisioning UNMAP using block/blk-lib.c:blkdev_issue_discard() */
  76 #define DA_EMULATE_TPU                          0
  77 /*
  78  * Emulation for Thin Provisioning WRITE_SAME w/ UNMAP=1 bit using
  79  * block/blk-lib.c:blkdev_issue_discard()
  80  */
  81 #define DA_EMULATE_TPWS                         0
  82 /* Emulation for CompareAndWrite (AtomicTestandSet) by default */
  83 #define DA_EMULATE_CAW                          1
  84 /* Emulation for 3rd Party Copy (ExtendedCopy) by default */
  85 #define DA_EMULATE_3PC                          1
  86 /* No Emulation for PSCSI by default */
  87 #define DA_EMULATE_ALUA                         0
  88 /* Enforce SCSI Initiator Port TransportID with 'ISID' for PR */
  89 #define DA_ENFORCE_PR_ISIDS                     1
  90 /* Force SPC-3 PR Activate Persistence across Target Power Loss */
  91 #define DA_FORCE_PR_APTPL                       0
  92 #define DA_STATUS_MAX_SECTORS_MIN               16
  93 #define DA_STATUS_MAX_SECTORS_MAX               8192
  94 /* By default don't report non-rotating (solid state) medium */
  95 #define DA_IS_NONROT                            0
  96 /* Queue Algorithm Modifier default for restricted reordering in control mode page */
  97 #define DA_EMULATE_REST_REORD                   0
  98
  99 #define SE_INQUIRY_BUF                          1024
 100 #define SE_MODE_PAGE_BUF                        512
 101 #define SE_SENSE_BUF                            96
 102
 103 /* struct se_hba->hba_flags */
 104 enum hba_flags_table {
 105         HBA_FLAGS_INTERNAL_USE  = 0x01,
 106         HBA_FLAGS_PSCSI_MODE    = 0x02,
 107 };
 108
 109 /* Special transport agnostic struct se_cmd->t_states */
 110 enum transport_state_table {
 111         TRANSPORT_NO_STATE      = 0,
 112         TRANSPORT_NEW_CMD       = 1,
 113         TRANSPORT_WRITE_PENDING = 3,
 114         TRANSPORT_PROCESSING    = 5,
 115         TRANSPORT_COMPLETE      = 6,
 116         TRANSPORT_ISTATE_PROCESSING = 11,
 117         TRANSPORT_COMPLETE_QF_WP = 18,
 118         TRANSPORT_COMPLETE_QF_OK = 19,
 119 };
 120
 121 /* Used for struct se_cmd->se_cmd_flags */
 122 enum se_cmd_flags_table {
 123         SCF_SUPPORTED_SAM_OPCODE        = 0x00000001,
 124         SCF_TRANSPORT_TASK_SENSE        = 0x00000002,
 125         SCF_EMULATED_TASK_SENSE         = 0x00000004,
 126         SCF_SCSI_DATA_CDB               = 0x00000008,
 127         SCF_SCSI_TMR_CDB                = 0x00000010,
 128         SCF_FUA                         = 0x00000080,
 129         SCF_SE_LUN_CMD                  = 0x00000100,
 130         SCF_BIDI                        = 0x00000400,
 131         SCF_SENT_CHECK_CONDITION        = 0x00000800,
 132         SCF_OVERFLOW_BIT                = 0x00001000,
 133         SCF_UNDERFLOW_BIT               = 0x00002000,
 134         SCF_SEND_DELAYED_TAS            = 0x00004000,
 135         SCF_ALUA_NON_OPTIMIZED          = 0x00008000,
 136         SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC = 0x00020000,
 137         SCF_COMPARE_AND_WRITE           = 0x00080000,
 138         SCF_COMPARE_AND_WRITE_POST      = 0x00100000,
 139         SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC = 0x00200000,
 140 };
 141
 142 /* struct se_dev_entry->lun_flags and struct se_lun->lun_access */
 143 enum transport_lunflags_table {
 144         TRANSPORT_LUNFLAGS_READ_ONLY            = 0x01,
 145         TRANSPORT_LUNFLAGS_READ_WRITE           = 0x02,
 146 };
 147
 148 /*
 149  * Used by transport_send_check_condition_and_sense()
 150  * to signal which ASC/ASCQ sense payload should be built.
 151  */
 152 typedef unsigned __bitwise__ sense_reason_t;
 153
 154 enum tcm_sense_reason_table {
 155 #define R(x)    (__force sense_reason_t )(x)
 156         TCM_NO_SENSE                            = R(0x00),
 157         TCM_NON_EXISTENT_LUN                    = R(0x01),
 158         TCM_UNSUPPORTED_SCSI_OPCODE             = R(0x02),
 159         TCM_INCORRECT_AMOUNT_OF_DATA            = R(0x03),
 160         TCM_UNEXPECTED_UNSOLICITED_DATA         = R(0x04),
 161         TCM_SERVICE_CRC_ERROR                   = R(0x05),
 162         TCM_SNACK_REJECTED                      = R(0x06),
 163         TCM_SECTOR_COUNT_TOO_MANY               = R(0x07),
 164         TCM_INVALID_CDB_FIELD                   = R(0x08),
 165         TCM_INVALID_PARAMETER_LIST              = R(0x09),
 166         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE  = R(0x0a),
 167         TCM_UNKNOWN_MODE_PAGE                   = R(0x0b),
 168         TCM_WRITE_PROTECTED                     = R(0x0c),
 169         TCM_CHECK_CONDITION_ABORT_CMD           = R(0x0d),
 170         TCM_CHECK_CONDITION_UNIT_ATTENTION      = R(0x0e),
 171         TCM_CHECK_CONDITION_NOT_READY           = R(0x0f),
 172         TCM_RESERVATION_CONFLICT                = R(0x10),
 173         TCM_ADDRESS_OUT_OF_RANGE                = R(0x11),
 174         TCM_OUT_OF_RESOURCES                    = R(0x12),
 175         TCM_PARAMETER_LIST_LENGTH_ERROR         = R(0x13),
 176         TCM_MISCOMPARE_VERIFY                   = R(0x14),
 177         TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED    = R(0x15),
 178         TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED  = R(0x16),
 179         TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED  = R(0x17),
 180 #undef R
 181 };
 182
 183 enum target_sc_flags_table {
 184         TARGET_SCF_BIDI_OP              = 0x01,
 185         TARGET_SCF_ACK_KREF             = 0x02,
 186         TARGET_SCF_UNKNOWN_SIZE         = 0x04,
 187 };
 188
 189 /* fabric independent task management function values */
 190 enum tcm_tmreq_table {
 191         TMR_ABORT_TASK          = 1,
 192         TMR_ABORT_TASK_SET      = 2,
 193         TMR_CLEAR_ACA           = 3,
 194         TMR_CLEAR_TASK_SET      = 4,
 195         TMR_LUN_RESET           = 5,
 196         TMR_TARGET_WARM_RESET   = 6,
 197         TMR_TARGET_COLD_RESET   = 7,
 198 };
 199
 200 /* fabric independent task management response values */
 201 enum tcm_tmrsp_table {
 202         TMR_FUNCTION_FAILED             = 0,
 203         TMR_FUNCTION_COMPLETE           = 1,
 204         TMR_TASK_DOES_NOT_EXIST         = 2,
 205         TMR_LUN_DOES_NOT_EXIST          = 3,
 206         TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED    = 4,
 207         TMR_FUNCTION_REJECTED           = 5,
 208 };
 209
 210 /*
 211  * Used for target SCSI statistics
 212  */
 213 typedef enum {
 214         SCSI_INST_INDEX,
 215         SCSI_DEVICE_INDEX,
 216         SCSI_AUTH_INTR_INDEX,
 217         SCSI_INDEX_TYPE_MAX
 218 } scsi_index_t;
 219
 220 struct se_cmd;
 221
 222 struct t10_alua_lba_map_member {
 223         struct list_head lba_map_mem_list;
 224         int lba_map_mem_alua_state;
 225         int lba_map_mem_alua_pg_id;
 226 };
 227
 228 struct t10_alua_lba_map {
 229         u64 lba_map_first_lba;
 230         u64 lba_map_last_lba;
 231         struct list_head lba_map_list;
 232         struct list_head lba_map_mem_list;
 233 };
 234
 235 struct t10_alua {
 236         /* ALUA Target Port Group ID */
 237         u16     alua_tg_pt_gps_counter;
 238         u32     alua_tg_pt_gps_count;
 239         /* Referrals support */
 240         spinlock_t lba_map_lock;
 241         u32     lba_map_segment_size;
 242         u32     lba_map_segment_multiplier;
 243         struct list_head lba_map_list;
 244         spinlock_t tg_pt_gps_lock;
 245         struct se_device *t10_dev;
 246         /* Used for default ALUA Target Port Group */
 247         struct t10_alua_tg_pt_gp *default_tg_pt_gp;
 248         /* Used for default ALUA Target Port Group ConfigFS group */
 249         struct config_group alua_tg_pt_gps_group;
 250         struct list_head tg_pt_gps_list;
 251 };
 252
 253 struct t10_alua_lu_gp {
 254         u16     lu_gp_id;
 255         int     lu_gp_valid_id;
 256         u32     lu_gp_members;
 257         atomic_t lu_gp_ref_cnt;
 258         spinlock_t lu_gp_lock;
 259         struct config_group lu_gp_group;
 260         struct list_head lu_gp_node;
 261         struct list_head lu_gp_mem_list;
 262 };
 263
 264 struct t10_alua_lu_gp_member {
 265         bool lu_gp_assoc;
 266         atomic_t lu_gp_mem_ref_cnt;
 267         spinlock_t lu_gp_mem_lock;
 268         struct t10_alua_lu_gp *lu_gp;
 269         struct se_device *lu_gp_mem_dev;
 270         struct list_head lu_gp_mem_list;
 271 };
 272
 273 struct t10_alua_tg_pt_gp {
 274         u16     tg_pt_gp_id;
 275         int     tg_pt_gp_valid_id;
 276         int     tg_pt_gp_alua_supported_states;
 277         int     tg_pt_gp_alua_pending_state;
 278         int     tg_pt_gp_alua_previous_state;
 279         int     tg_pt_gp_alua_access_status;
 280         int     tg_pt_gp_alua_access_type;
 281         int     tg_pt_gp_nonop_delay_msecs;
 282         int     tg_pt_gp_trans_delay_msecs;
 283         int     tg_pt_gp_implicit_trans_secs;
 284         int     tg_pt_gp_pref;
 285         int     tg_pt_gp_write_metadata;
 286         u32     tg_pt_gp_members;
 287         atomic_t tg_pt_gp_alua_access_state;
 288         atomic_t tg_pt_gp_ref_cnt;
 289         spinlock_t tg_pt_gp_lock;
 290         struct mutex tg_pt_gp_md_mutex;
 291         struct se_device *tg_pt_gp_dev;
 292         struct config_group tg_pt_gp_group;
 293         struct list_head tg_pt_gp_list;
 294         struct list_head tg_pt_gp_lun_list;
 295         struct se_lun *tg_pt_gp_alua_lun;
 296         struct se_node_acl *tg_pt_gp_alua_nacl;
 297         struct delayed_work tg_pt_gp_transition_work;
 298         struct completion *tg_pt_gp_transition_complete;
 299 };
 300
 301 struct t10_vpd {
 302         unsigned char device_identifier[INQUIRY_VPD_DEVICE_IDENTIFIER_LEN];
 303         int protocol_identifier_set;
 304         u32 protocol_identifier;
 305         u32 device_identifier_code_set;
 306         u32 association;
 307         u32 device_identifier_type;
 308         struct list_head vpd_list;
 309 };
 310
 311 struct t10_wwn {
 312         char vendor[8];
 313         char model[16];
 314         char revision[4];
 315         char unit_serial[INQUIRY_VPD_SERIAL_LEN];
 316         spinlock_t t10_vpd_lock;
 317         struct se_device *t10_dev;
 318         struct config_group t10_wwn_group;
 319         struct list_head t10_vpd_list;
 320 };
 321
 322 struct t10_pr_registration {
 323         /* Used for fabrics that contain WWN+ISID */
 324 #define PR_REG_ISID_LEN                         16
 325         /* PR_REG_ISID_LEN + ',i,0x' */
 326 #define PR_REG_ISID_ID_LEN                      (PR_REG_ISID_LEN + 5)
 327         char pr_reg_isid[PR_REG_ISID_LEN];
 328         /* Used during APTPL metadata reading */
 329 #define PR_APTPL_MAX_IPORT_LEN                  256
 330         unsigned char pr_iport[PR_APTPL_MAX_IPORT_LEN];
 331         /* Used during APTPL metadata reading */
 332 #define PR_APTPL_MAX_TPORT_LEN                  256
 333         unsigned char pr_tport[PR_APTPL_MAX_TPORT_LEN];
 334         u16 pr_aptpl_rpti;
 335         u16 pr_reg_tpgt;
 336         /* Reservation effects all target ports */
 337         int pr_reg_all_tg_pt;
 338         /* Activate Persistence across Target Power Loss */
 339         int pr_reg_aptpl;
 340         int pr_res_holder;
 341         int pr_res_type;
 342         int pr_res_scope;
 343         /* Used for fabric initiator WWPNs using a ISID */
 344         bool isid_present_at_reg;
 345         u64 pr_res_mapped_lun;
 346         u64 pr_aptpl_target_lun;
 347         u16 tg_pt_sep_rtpi;
 348         u32 pr_res_generation;
 349         u64 pr_reg_bin_isid;
 350         u64 pr_res_key;
 351         atomic_t pr_res_holders;
 352         struct se_node_acl *pr_reg_nacl;
 353         /* Used by ALL_TG_PT=1 registration with deve->pr_ref taken */
 354         struct se_dev_entry *pr_reg_deve;
 355         struct list_head pr_reg_list;
 356         struct list_head pr_reg_abort_list;
 357         struct list_head pr_reg_aptpl_list;
 358         struct list_head pr_reg_atp_list;
 359         struct list_head pr_reg_atp_mem_list;
 360 };
 361
 362 struct t10_reservation {
 363         /* Reservation effects all target ports */
 364         int pr_all_tg_pt;
 365         /* Activate Persistence across Target Power Loss enabled
 366          * for SCSI device */
 367         int pr_aptpl_active;
 368 #define PR_APTPL_BUF_LEN                        262144
 369         u32 pr_generation;
 370         spinlock_t registration_lock;
 371         spinlock_t aptpl_reg_lock;
 372         /*
 373          * This will always be set by one individual I_T Nexus.
 374          * However with all_tg_pt=1, other I_T Nexus from the
 375          * same initiator can access PR reg/res info on a different
 376          * target port.
 377          *
 378          * There is also the 'All Registrants' case, where there is
 379          * a single *pr_res_holder of the reservation, but all
 380          * registrations are considered reservation holders.
 381          */
 382         struct se_node_acl *pr_res_holder;
 383         struct list_head registration_list;
 384         struct list_head aptpl_reg_list;
 385 };
 386
 387 struct se_tmr_req {
 388         /* Task Management function to be performed */
 389         u8                      function;
 390         /* Task Management response to send */
 391         u8                      response;
 392         int                     call_transport;
 393         /* Reference to ITT that Task Mgmt should be performed */
 394         u64                     ref_task_tag;
 395         void                    *fabric_tmr_ptr;
 396         struct se_cmd           *task_cmd;
 397         struct se_device        *tmr_dev;
 398         struct se_lun           *tmr_lun;
 399         struct list_head        tmr_list;
 400 };
 401
 402 enum target_prot_op {
 403         TARGET_PROT_NORMAL      = 0,
 404         TARGET_PROT_DIN_INSERT  = (1 << 0),
 405         TARGET_PROT_DOUT_INSERT = (1 << 1),
 406         TARGET_PROT_DIN_STRIP   = (1 << 2),
 407         TARGET_PROT_DOUT_STRIP  = (1 << 3),
 408         TARGET_PROT_DIN_PASS    = (1 << 4),
 409         TARGET_PROT_DOUT_PASS   = (1 << 5),
 410 };
 411
 412 #define TARGET_PROT_ALL TARGET_PROT_DIN_INSERT | TARGET_PROT_DOUT_INSERT | \
 413                         TARGET_PROT_DIN_STRIP | TARGET_PROT_DOUT_STRIP | \
 414                         TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS
 415
 416 enum target_prot_type {
 417         TARGET_DIF_TYPE0_PROT,
 418         TARGET_DIF_TYPE1_PROT,
 419         TARGET_DIF_TYPE2_PROT,
 420         TARGET_DIF_TYPE3_PROT,
 421 };
 422
 423 enum target_core_dif_check {
 424         TARGET_DIF_CHECK_GUARD  = 0x1 << 0,
 425         TARGET_DIF_CHECK_APPTAG = 0x1 << 1,
 426         TARGET_DIF_CHECK_REFTAG = 0x1 << 2,
 427 };
 428
 429 struct se_dif_v1_tuple {
 430         __be16                  guard_tag;
 431         __be16                  app_tag;
 432         __be32                  ref_tag;
 433 };
 434
 435 /* for sam_task_attr */
 436 #define TCM_SIMPLE_TAG  0x20
 437 #define TCM_HEAD_TAG    0x21
 438 #define TCM_ORDERED_TAG 0x22
 439 #define TCM_ACA_TAG     0x24
 440
 441 struct se_cmd {
 442         /* SAM response code being sent to initiator */
 443         u8                      scsi_status;
 444         u8                      scsi_asc;
 445         u8                      scsi_ascq;
 446         u16                     scsi_sense_length;
 447         u64                     tag; /* SAM command identifier aka task tag */
 448         /* Delay for ALUA Active/NonOptimized state access in milliseconds */
 449         int                     alua_nonop_delay;
 450         /* See include/linux/dma-mapping.h */
 451         enum dma_data_direction data_direction;
 452         /* For SAM Task Attribute */
 453         int                     sam_task_attr;
 454         /* Used for se_sess->sess_tag_pool */
 455         unsigned int            map_tag;
 456         /* Transport protocol dependent state, see transport_state_table */
 457         enum transport_state_table t_state;
 458         unsigned                cmd_wait_set:1;
 459         unsigned                unknown_data_length:1;
 460         /* See se_cmd_flags_table */
 461         u32                     se_cmd_flags;
 462         u32                     se_ordered_id;
 463         /* Total size in bytes associated with command */
 464         u32                     data_length;
 465         u32                     residual_count;
 466         u64                     orig_fe_lun;
 467         /* Persistent Reservation key */
 468         u64                     pr_res_key;
 469         /* Used for sense data */
 470         void                    *sense_buffer;
 471         struct list_head        se_delayed_node;
 472         struct list_head        se_qf_node;
 473         struct se_device      *se_dev;
 474         struct se_lun           *se_lun;
 475         /* Only used for internal passthrough and legacy TCM fabric modules */
 476         struct se_session       *se_sess;
 477         struct se_tmr_req       *se_tmr_req;
 478         struct list_head        se_cmd_list;
 479         struct completion       cmd_wait_comp;
 480         struct kref             cmd_kref;
 481         const struct target_core_fabric_ops *se_tfo;
 482         sense_reason_t          (*execute_cmd)(struct se_cmd *);
 483         sense_reason_t (*transport_complete_callback)(struct se_cmd *, bool);
 484         void                    *protocol_data;
 485
 486         unsigned char           *t_task_cdb;
 487         unsigned char           __t_task_cdb[TCM_MAX_COMMAND_SIZE];
 488         unsigned long long      t_task_lba;
 489         unsigned int            t_task_nolb;
 490         unsigned int            transport_state;
 491 #define CMD_T_ABORTED           (1 << 0)
 492 #define CMD_T_ACTIVE            (1 << 1)
 493 #define CMD_T_COMPLETE          (1 << 2)
 494 #define CMD_T_SENT              (1 << 4)
 495 #define CMD_T_STOP              (1 << 5)
 496 #define CMD_T_DEV_ACTIVE        (1 << 7)
 497 #define CMD_T_REQUEST_STOP      (1 << 8)
 498 #define CMD_T_BUSY              (1 << 9)
 499         spinlock_t              t_state_lock;
 500         struct completion       t_transport_stop_comp;
 501
 502         struct work_struct      work;
 503
 504         struct scatterlist      *t_data_sg;
 505         struct scatterlist      *t_data_sg_orig;
 506         unsigned int            t_data_nents;
 507         unsigned int            t_data_nents_orig;
 508         void                    *t_data_vmap;
 509         struct scatterlist      *t_bidi_data_sg;
 510         unsigned int            t_bidi_data_nents;
 511
 512         struct list_head        state_list;
 513         bool                    state_active;
 514
 515         /* old task stop completion, consider merging with some of the above */
 516         struct completion       task_stop_comp;
 517
 518         /* backend private data */
 519         void                    *priv;
 520
 521         /* Used for lun->lun_ref counting */
 522         int                     lun_ref_active;
 523
 524         /* DIF related members */
 525         enum target_prot_op     prot_op;
 526         enum target_prot_type   prot_type;
 527         u8                      prot_checks;
 528         u32                     prot_length;
 529         u32                     reftag_seed;
 530         struct scatterlist      *t_prot_sg;
 531         unsigned int            t_prot_nents;
 532         sense_reason_t          pi_err;
 533         sector_t                bad_sector;
 534         bool                    prot_pto;
 535 };
 536
 537 struct se_ua {
 538         u8                      ua_asc;
 539         u8                      ua_ascq;
 540         struct list_head        ua_nacl_list;
 541 };
 542
 543 struct se_node_acl {
 544         char                    initiatorname[TRANSPORT_IQN_LEN];
 545         /* Used to signal demo mode created ACL, disabled by default */
 546         bool                    dynamic_node_acl;
 547         bool                    acl_stop:1;
 548         u32                     queue_depth;
 549         u32                     acl_index;
 550         enum target_prot_type   saved_prot_type;
 551 #define MAX_ACL_TAG_SIZE 64
 552         char                    acl_tag[MAX_ACL_TAG_SIZE];
 553         /* Used for PR SPEC_I_PT=1 and REGISTER_AND_MOVE */
 554         atomic_t                acl_pr_ref_count;
 555         struct hlist_head       lun_entry_hlist;
 556         struct se_session       *nacl_sess;
 557         struct se_portal_group *se_tpg;
 558         struct mutex            lun_entry_mutex;
 559         spinlock_t              nacl_sess_lock;
 560         struct config_group     acl_group;
 561         struct config_group     acl_attrib_group;
 562         struct config_group     acl_auth_group;
 563         struct config_group     acl_param_group;
 564         struct config_group     acl_fabric_stat_group;
 565         struct config_group     *acl_default_groups[5];
 566         struct list_head        acl_list;
 567         struct list_head        acl_sess_list;
 568         struct completion       acl_free_comp;
 569         struct kref             acl_kref;
 570 };
 571
 572 struct se_session {
 573         unsigned                sess_tearing_down:1;
 574         u64                     sess_bin_isid;
 575         enum target_prot_op     sup_prot_ops;
 576         enum target_prot_type   sess_prot_type;
 577         struct se_node_acl      *se_node_acl;
 578         struct se_portal_group *se_tpg;
 579         void                    *fabric_sess_ptr;
 580         struct list_head        sess_list;
 581         struct list_head        sess_acl_list;
 582         struct list_head        sess_cmd_list;
 583         struct list_head        sess_wait_list;
 584         spinlock_t              sess_cmd_lock;
 585         struct kref             sess_kref;
 586         void                    *sess_cmd_map;
 587         struct percpu_ida       sess_tag_pool;
 588 };
 589
 590 struct se_device;
 591 struct se_transform_info;
 592 struct scatterlist;
 593
 594 struct se_ml_stat_grps {
 595         struct config_group     stat_group;
 596         struct config_group     scsi_auth_intr_group;
 597         struct config_group     scsi_att_intr_port_group;
 598 };
 599
 600 struct se_lun_acl {
 601         char                    initiatorname[TRANSPORT_IQN_LEN];
 602         u64                     mapped_lun;
 603         struct se_node_acl      *se_lun_nacl;
 604         struct se_lun           *se_lun;
 605         struct config_group     se_lun_group;
 606         struct se_ml_stat_grps  ml_stat_grps;
 607 };
 608
 609 struct se_dev_entry {
 610         /* See transport_lunflags_table */
 611         u64                     mapped_lun;
 612         u64                     pr_res_key;
 613         u64                     creation_time;
 614         u32                     lun_flags;
 615         u32                     attach_count;
 616         atomic_long_t           total_cmds;
 617         atomic_long_t           read_bytes;
 618         atomic_long_t           write_bytes;
 619         atomic_t                ua_count;
 620         /* Used for PR SPEC_I_PT=1 and REGISTER_AND_MOVE */
 621         struct kref             pr_kref;
 622         struct completion       pr_comp;
 623         struct se_lun_acl __rcu *se_lun_acl;
 624         spinlock_t              ua_lock;
 625         struct se_lun __rcu     *se_lun;
 626 #define DEF_PR_REG_ACTIVE               1
 627         unsigned long           deve_flags;
 628         struct list_head        alua_port_list;
 629         struct list_head        lun_link;
 630         struct list_head        ua_list;
 631         struct hlist_node       link;
 632         struct rcu_head         rcu_head;
 633 };
 634
 635 struct se_dev_attrib {
 636         int             emulate_model_alias;
 637         int             emulate_dpo;
 638         int             emulate_fua_write;
 639         int             emulate_fua_read;
 640         int             emulate_write_cache;
 641         int             emulate_ua_intlck_ctrl;
 642         int             emulate_tas;
 643         int             emulate_tpu;
 644         int             emulate_tpws;
 645         int             emulate_caw;
 646         int             emulate_3pc;
 647         int             pi_prot_format;
 648         enum target_prot_type pi_prot_type;
 649         enum target_prot_type hw_pi_prot_type;
 650         int             enforce_pr_isids;
 651         int             force_pr_aptpl;
 652         int             is_nonrot;
 653         int             emulate_rest_reord;
 654         u32             hw_block_size;
 655         u32             block_size;
 656         u32             hw_max_sectors;
 657         u32             optimal_sectors;
 658         u32             hw_queue_depth;
 659         u32             queue_depth;
 660         u32             max_unmap_lba_count;
 661         u32             max_unmap_block_desc_count;
 662         u32             unmap_granularity;
 663         u32             unmap_granularity_alignment;
 664         u32             max_write_same_len;
 665         u32             max_bytes_per_io;
 666         struct se_device *da_dev;
 667         struct config_group da_group;
 668 };
 669
 670 struct se_port_stat_grps {
 671         struct config_group stat_group;
 672         struct config_group scsi_port_group;
 673         struct config_group scsi_tgt_port_group;
 674         struct config_group scsi_transport_group;
 675 };
 676
 677 struct scsi_port_stats {
 678         atomic_long_t   cmd_pdus;
 679         atomic_long_t   tx_data_octets;
 680         atomic_long_t   rx_data_octets;
 681 };
 682
 683 struct se_lun {
 684         u64                     unpacked_lun;
 685 #define SE_LUN_LINK_MAGIC                       0xffff7771
 686         u32                     lun_link_magic;
 687         u32                     lun_access;
 688         u32                     lun_flags;
 689         u32                     lun_index;
 690
 691         /* RELATIVE TARGET PORT IDENTIFER */
 692         u16                     lun_rtpi;
 693         atomic_t                lun_acl_count;
 694         struct se_device __rcu  *lun_se_dev;
 695
 696         struct list_head        lun_deve_list;
 697         spinlock_t              lun_deve_lock;
 698
 699         /* ALUA state */
 700         int                     lun_tg_pt_secondary_stat;
 701         int                     lun_tg_pt_secondary_write_md;
 702         atomic_t                lun_tg_pt_secondary_offline;
 703         struct mutex            lun_tg_pt_md_mutex;
 704
 705         /* ALUA target port group linkage */
 706         struct list_head        lun_tg_pt_gp_link;
 707         struct t10_alua_tg_pt_gp *lun_tg_pt_gp;
 708         spinlock_t              lun_tg_pt_gp_lock;
 709
 710         struct se_portal_group  *lun_tpg;
 711         struct scsi_port_stats  lun_stats;
 712         struct config_group     lun_group;
 713         struct se_port_stat_grps port_stat_grps;
 714         struct completion       lun_ref_comp;
 715         struct percpu_ref       lun_ref;
 716         struct list_head        lun_dev_link;
 717         struct hlist_node       link;
 718         struct rcu_head         rcu_head;
 719 };
 720
 721 struct se_dev_stat_grps {
 722         struct config_group stat_group;
 723         struct config_group scsi_dev_group;
 724         struct config_group scsi_tgt_dev_group;
 725         struct config_group scsi_lu_group;
 726 };
 727
 728 struct se_device {
 729 #define SE_DEV_LINK_MAGIC                       0xfeeddeef
 730         u32                     dev_link_magic;
 731         /* RELATIVE TARGET PORT IDENTIFER Counter */
 732         u16                     dev_rpti_counter;
 733         /* Used for SAM Task Attribute ordering */
 734         u32                     dev_cur_ordered_id;
 735         u32                     dev_flags;
 736 #define DF_CONFIGURED                           0x00000001
 737 #define DF_FIRMWARE_VPD_UNIT_SERIAL             0x00000002
 738 #define DF_EMULATED_VPD_UNIT_SERIAL             0x00000004
 739 #define DF_USING_UDEV_PATH                      0x00000008
 740 #define DF_USING_ALIAS                          0x00000010
 741         /* Physical device queue depth */
 742         u32                     queue_depth;
 743         /* Used for SPC-2 reservations enforce of ISIDs */
 744         u64                     dev_res_bin_isid;
 745         /* Pointer to transport specific device structure */
 746         u32                     dev_index;
 747         u64                     creation_time;
 748         atomic_long_t           num_resets;
 749         atomic_long_t           num_cmds;
 750         atomic_long_t           read_bytes;
 751         atomic_long_t           write_bytes;
 752         /* Active commands on this virtual SE device */
 753         atomic_t                simple_cmds;
 754         atomic_t                dev_ordered_id;
 755         atomic_t                dev_ordered_sync;
 756         atomic_t                dev_qf_count;
 757         u32                     export_count;
 758         spinlock_t              delayed_cmd_lock;
 759         spinlock_t              execute_task_lock;
 760         spinlock_t              dev_reservation_lock;
 761         unsigned int            dev_reservation_flags;
 762 #define DRF_SPC2_RESERVATIONS                   0x00000001
 763 #define DRF_SPC2_RESERVATIONS_WITH_ISID         0x00000002
 764         spinlock_t              se_port_lock;
 765         spinlock_t              se_tmr_lock;
 766         spinlock_t              qf_cmd_lock;
 767         struct semaphore        caw_sem;
 768         /* Used for legacy SPC-2 reservationsa */
 769         struct se_node_acl      *dev_reserved_node_acl;
 770         /* Used for ALUA Logical Unit Group membership */
 771         struct t10_alua_lu_gp_member *dev_alua_lu_gp_mem;
 772         /* Used for SPC-3 Persistent Reservations */
 773         struct t10_pr_registration *dev_pr_res_holder;
 774         struct list_head        dev_sep_list;
 775         struct list_head        dev_tmr_list;
 776         struct workqueue_struct *tmr_wq;
 777         struct work_struct      qf_work_queue;
 778         struct list_head        delayed_cmd_list;
 779         struct list_head        state_list;
 780         struct list_head        qf_cmd_list;
 781         struct list_head        g_dev_node;
 782         /* Pointer to associated SE HBA */
 783         struct se_hba           *se_hba;
 784         /* T10 Inquiry and VPD WWN Information */
 785         struct t10_wwn          t10_wwn;
 786         /* T10 Asymmetric Logical Unit Assignment for Target Ports */
 787         struct t10_alua         t10_alua;
 788         /* T10 SPC-2 + SPC-3 Reservations */
 789         struct t10_reservation  t10_pr;
 790         struct se_dev_attrib    dev_attrib;
 791         struct config_group     dev_group;
 792         struct config_group     dev_pr_group;
 793         struct se_dev_stat_grps dev_stat_grps;
 794 #define SE_DEV_ALIAS_LEN 512            /* must be less than PAGE_SIZE */
 795         unsigned char           dev_alias[SE_DEV_ALIAS_LEN];
 796 #define SE_UDEV_PATH_LEN 512            /* must be less than PAGE_SIZE */
 797         unsigned char           udev_path[SE_UDEV_PATH_LEN];
 798         /* Pointer to template of function pointers for transport */
 799         const struct target_backend_ops *transport;
 800         /* Linked list for struct se_hba struct se_device list */
 801         struct list_head        dev_list;
 802         struct se_lun           xcopy_lun;
 803         /* Protection Information */
 804         int                     prot_length;
 805         /* For se_lun->lun_se_dev RCU read-side critical access */
 806         u32                     hba_index;
 807         struct rcu_head         rcu_head;
 808 };
 809
 810 struct se_hba {
 811         u16                     hba_tpgt;
 812         u32                     hba_id;
 813         /* See hba_flags_table */
 814         u32                     hba_flags;
 815         /* Virtual iSCSI devices attached. */
 816         u32                     dev_count;
 817         u32                     hba_index;
 818         /* Pointer to transport specific host structure. */
 819         void                    *hba_ptr;
 820         struct list_head        hba_node;
 821         spinlock_t              device_lock;
 822         struct config_group     hba_group;
 823         struct mutex            hba_access_mutex;
 824         struct target_backend   *backend;
 825 };
 826
 827 struct se_tpg_np {
 828         struct se_portal_group *tpg_np_parent;
 829         struct config_group     tpg_np_group;
 830 };
 831
 832 struct se_portal_group {
 833         /*
 834          * PROTOCOL IDENTIFIER value per SPC4, 7.5.1.
 835          *
 836          * Negative values can be used by fabric drivers for internal use TPGs.
 837          */
 838         int                     proto_id;
 839         /* Number of ACLed Initiator Nodes for this TPG */
 840         u32                     num_node_acls;
 841         /* Used for PR SPEC_I_PT=1 and REGISTER_AND_MOVE */
 842         atomic_t                tpg_pr_ref_count;
 843         /* Spinlock for adding/removing ACLed Nodes */
 844         struct mutex            acl_node_mutex;
 845         /* Spinlock for adding/removing sessions */
 846         spinlock_t              session_lock;
 847         struct mutex            tpg_lun_mutex;
 848         struct list_head        se_tpg_node;
 849         /* linked list for initiator ACL list */
 850         struct list_head        acl_node_list;
 851         struct hlist_head       tpg_lun_hlist;
 852         struct se_lun           *tpg_virt_lun0;
 853         /* List of TCM sessions associated wth this TPG */
 854         struct list_head        tpg_sess_list;
 855         /* Pointer to $FABRIC_MOD dependent code */
 856         const struct target_core_fabric_ops *se_tpg_tfo;
 857         struct se_wwn           *se_tpg_wwn;
 858         struct config_group     tpg_group;
 859         struct config_group     *tpg_default_groups[7];
 860         struct config_group     tpg_lun_group;
 861         struct config_group     tpg_np_group;
 862         struct config_group     tpg_acl_group;
 863         struct config_group     tpg_attrib_group;
 864         struct config_group     tpg_auth_group;
 865         struct config_group     tpg_param_group;
 866 };
 867
 868 struct se_wwn {
 869         struct target_fabric_configfs *wwn_tf;
 870         struct config_group     wwn_group;
 871         struct config_group     *wwn_default_groups[2];
 872         struct config_group     fabric_stat_group;
 873 };
 874
 875 static inline void atomic_inc_mb(atomic_t *v)
 876 {
 877         smp_mb__before_atomic();
 878         atomic_inc(v);
 879         smp_mb__after_atomic();
 880 }
 881
 882 static inline void atomic_dec_mb(atomic_t *v)
 883 {
 884         smp_mb__before_atomic();
 885         atomic_dec(v);
 886         smp_mb__after_atomic();
 887 }
 888
 889 #endif /* TARGET_CORE_BASE_H */