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 <scsi/scsi_cmnd.h>
   9 #include <net/sock.h>
  10 #include <net/tcp.h>
  11
  12 #define TARGET_CORE_MOD_VERSION         "v4.0.0-rc7-ml"
  13 #define SHUTDOWN_SIGS   (sigmask(SIGKILL)|sigmask(SIGINT)|sigmask(SIGABRT))
  14
  15 /* Used by transport_generic_allocate_iovecs() */
  16 #define TRANSPORT_IOV_DATA_BUFFER               5
  17 /* Maximum Number of LUNs per Target Portal Group */
  18 #define TRANSPORT_MAX_LUNS_PER_TPG              256
  19 /*
  20  * By default we use 32-byte CDBs in TCM Core and subsystem plugin code.
  21  *
  22  * Note that both include/scsi/scsi_cmnd.h:MAX_COMMAND_SIZE and
  23  * include/linux/blkdev.h:BLOCK_MAX_CDB as of v2.6.36-rc4 still use
  24  * 16-byte CDBs by default and require an extra allocation for
  25  * 32-byte CDBs to becasue of legacy issues.
  26  *
  27  * Within TCM Core there are no such legacy limitiations, so we go ahead
  28  * use 32-byte CDBs by default and use include/scsi/scsi.h:scsi_command_size()
  29  * within all TCM Core and subsystem plugin code.
  30  */
  31 #define TCM_MAX_COMMAND_SIZE                    32
  32 /*
  33  * From include/scsi/scsi_cmnd.h:SCSI_SENSE_BUFFERSIZE, currently
  34  * defined 96, but the real limit is 252 (or 260 including the header)
  35  */
  36 #define TRANSPORT_SENSE_BUFFER                  SCSI_SENSE_BUFFERSIZE
  37 /* Used by transport_send_check_condition_and_sense() */
  38 #define SPC_SENSE_KEY_OFFSET                    2
  39 #define SPC_ASC_KEY_OFFSET                      12
  40 #define SPC_ASCQ_KEY_OFFSET                     13
  41 #define TRANSPORT_IQN_LEN                       224
  42 /* Used by target_core_store_alua_lu_gp() and target_core_alua_lu_gp_show_attr_members() */
  43 #define LU_GROUP_NAME_BUF                       256
  44 /* Used by core_alua_store_tg_pt_gp_info() and target_core_alua_tg_pt_gp_show_attr_members() */
  45 #define TG_PT_GROUP_NAME_BUF                    256
  46 /* Used to parse VPD into struct t10_vpd */
  47 #define VPD_TMP_BUF_SIZE                        128
  48 /* Used by transport_generic_cmd_sequencer() */
  49 #define READ_BLOCK_LEN                          6
  50 #define READ_CAP_LEN                            8
  51 #define READ_POSITION_LEN                       20
  52 #define INQUIRY_LEN                             36
  53 /* Used by transport_get_inquiry_vpd_serial() */
  54 #define INQUIRY_VPD_SERIAL_LEN                  254
  55 /* Used by transport_get_inquiry_vpd_device_ident() */
  56 #define INQUIRY_VPD_DEVICE_IDENTIFIER_LEN       254
  57
  58 /* struct se_hba->hba_flags */
  59 enum hba_flags_table {
  60         HBA_FLAGS_INTERNAL_USE  = 0x01,
  61         HBA_FLAGS_PSCSI_MODE    = 0x02,
  62 };
  63
  64 /* struct se_lun->lun_status */
  65 enum transport_lun_status_table {
  66         TRANSPORT_LUN_STATUS_FREE = 0,
  67         TRANSPORT_LUN_STATUS_ACTIVE = 1,
  68 };
  69
  70 /* struct se_portal_group->se_tpg_type */
  71 enum transport_tpg_type_table {
  72         TRANSPORT_TPG_TYPE_NORMAL = 0,
  73         TRANSPORT_TPG_TYPE_DISCOVERY = 1,
  74 };
  75
  76 /* Used for generate timer flags */
  77 enum timer_flags_table {
  78         TF_RUNNING      = 0x01,
  79         TF_STOP         = 0x02,
  80 };
  81
  82 /* Special transport agnostic struct se_cmd->t_states */
  83 enum transport_state_table {
  84         TRANSPORT_NO_STATE      = 0,
  85         TRANSPORT_NEW_CMD       = 1,
  86         TRANSPORT_DEFERRED_CMD  = 2,
  87         TRANSPORT_WRITE_PENDING = 3,
  88         TRANSPORT_PROCESS_WRITE = 4,
  89         TRANSPORT_PROCESSING    = 5,
  90         TRANSPORT_COMPLETE_OK   = 6,
  91         TRANSPORT_COMPLETE_FAILURE = 7,
  92         TRANSPORT_COMPLETE_TIMEOUT = 8,
  93         TRANSPORT_PROCESS_TMR   = 9,
  94         TRANSPORT_TMR_COMPLETE  = 10,
  95         TRANSPORT_ISTATE_PROCESSING = 11,
  96         TRANSPORT_ISTATE_PROCESSED = 12,
  97         TRANSPORT_KILL          = 13,
  98         TRANSPORT_REMOVE        = 14,
  99         TRANSPORT_FREE          = 15,
 100         TRANSPORT_NEW_CMD_MAP   = 16,
 101 };
 102
 103 /* Used for struct se_cmd->se_cmd_flags */
 104 enum se_cmd_flags_table {
 105         SCF_SUPPORTED_SAM_OPCODE        = 0x00000001,
 106         SCF_TRANSPORT_TASK_SENSE        = 0x00000002,
 107         SCF_EMULATED_TASK_SENSE         = 0x00000004,
 108         SCF_SCSI_DATA_SG_IO_CDB         = 0x00000008,
 109         SCF_SCSI_CONTROL_SG_IO_CDB      = 0x00000010,
 110         SCF_SCSI_CONTROL_NONSG_IO_CDB   = 0x00000020,
 111         SCF_SCSI_NON_DATA_CDB           = 0x00000040,
 112         SCF_SCSI_CDB_EXCEPTION          = 0x00000080,
 113         SCF_SCSI_RESERVATION_CONFLICT   = 0x00000100,
 114         SCF_CMD_PASSTHROUGH_NOALLOC     = 0x00000200,
 115         SCF_SE_CMD_FAILED               = 0x00000400,
 116         SCF_SE_LUN_CMD                  = 0x00000800,
 117         SCF_SE_ALLOW_EOO                = 0x00001000,
 118         SCF_SE_DISABLE_ONLINE_CHECK     = 0x00002000,
 119         SCF_SENT_CHECK_CONDITION        = 0x00004000,
 120         SCF_OVERFLOW_BIT                = 0x00008000,
 121         SCF_UNDERFLOW_BIT               = 0x00010000,
 122         SCF_SENT_DELAYED_TAS            = 0x00020000,
 123         SCF_ALUA_NON_OPTIMIZED          = 0x00040000,
 124         SCF_DELAYED_CMD_FROM_SAM_ATTR   = 0x00080000,
 125         SCF_PASSTHROUGH_SG_TO_MEM       = 0x00100000,
 126         SCF_PASSTHROUGH_CONTIG_TO_SG    = 0x00200000,
 127         SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC = 0x00400000,
 128         SCF_EMULATE_SYNC_CACHE          = 0x00800000,
 129         SCF_EMULATE_CDB_ASYNC           = 0x01000000,
 130         SCF_EMULATE_SYNC_UNMAP          = 0x02000000
 131 };
 132
 133 /* struct se_dev_entry->lun_flags and struct se_lun->lun_access */
 134 enum transport_lunflags_table {
 135         TRANSPORT_LUNFLAGS_NO_ACCESS            = 0x00,
 136         TRANSPORT_LUNFLAGS_INITIATOR_ACCESS     = 0x01,
 137         TRANSPORT_LUNFLAGS_READ_ONLY            = 0x02,
 138         TRANSPORT_LUNFLAGS_READ_WRITE           = 0x04,
 139 };
 140
 141 /* struct se_device->dev_status */
 142 enum transport_device_status_table {
 143         TRANSPORT_DEVICE_ACTIVATED              = 0x01,
 144         TRANSPORT_DEVICE_DEACTIVATED            = 0x02,
 145         TRANSPORT_DEVICE_QUEUE_FULL             = 0x04,
 146         TRANSPORT_DEVICE_SHUTDOWN               = 0x08,
 147         TRANSPORT_DEVICE_OFFLINE_ACTIVATED      = 0x10,
 148         TRANSPORT_DEVICE_OFFLINE_DEACTIVATED    = 0x20,
 149 };
 150
 151 /*
 152  * Used by transport_send_check_condition_and_sense() and se_cmd->scsi_sense_reason
 153  * to signal which ASC/ASCQ sense payload should be built.
 154  */
 155 enum tcm_sense_reason_table {
 156         TCM_NON_EXISTENT_LUN                    = 0x01,
 157         TCM_UNSUPPORTED_SCSI_OPCODE             = 0x02,
 158         TCM_INCORRECT_AMOUNT_OF_DATA            = 0x03,
 159         TCM_UNEXPECTED_UNSOLICITED_DATA         = 0x04,
 160         TCM_SERVICE_CRC_ERROR                   = 0x05,
 161         TCM_SNACK_REJECTED                      = 0x06,
 162         TCM_SECTOR_COUNT_TOO_MANY               = 0x07,
 163         TCM_INVALID_CDB_FIELD                   = 0x08,
 164         TCM_INVALID_PARAMETER_LIST              = 0x09,
 165         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE  = 0x0a,
 166         TCM_UNKNOWN_MODE_PAGE                   = 0x0b,
 167         TCM_WRITE_PROTECTED                     = 0x0c,
 168         TCM_CHECK_CONDITION_ABORT_CMD           = 0x0d,
 169         TCM_CHECK_CONDITION_UNIT_ATTENTION      = 0x0e,
 170         TCM_CHECK_CONDITION_NOT_READY           = 0x0f,
 171 };
 172
 173 struct se_obj {
 174         atomic_t obj_access_count;
 175 } ____cacheline_aligned;
 176
 177 /*
 178  * Used by TCM Core internally to signal if ALUA emulation is enabled or
 179  * disabled, or running in with TCM/pSCSI passthrough mode
 180  */
 181 typedef enum {
 182         SPC_ALUA_PASSTHROUGH,
 183         SPC2_ALUA_DISABLED,
 184         SPC3_ALUA_EMULATED
 185 } t10_alua_index_t;
 186
 187 /*
 188  * Used by TCM Core internally to signal if SAM Task Attribute emulation
 189  * is enabled or disabled, or running in with TCM/pSCSI passthrough mode
 190  */
 191 typedef enum {
 192         SAM_TASK_ATTR_PASSTHROUGH,
 193         SAM_TASK_ATTR_UNTAGGED,
 194         SAM_TASK_ATTR_EMULATED
 195 } t10_task_attr_index_t;
 196
 197 /*
 198  * Used for target SCSI statistics
 199  */
 200 typedef enum {
 201         SCSI_INST_INDEX,
 202         SCSI_DEVICE_INDEX,
 203         SCSI_AUTH_INTR_INDEX,
 204         SCSI_INDEX_TYPE_MAX
 205 } scsi_index_t;
 206
 207 struct scsi_index_table {
 208         spinlock_t      lock;
 209         u32             scsi_mib_index[SCSI_INDEX_TYPE_MAX];
 210 } ____cacheline_aligned;
 211
 212 struct se_cmd;
 213
 214 struct t10_alua {
 215         t10_alua_index_t alua_type;
 216         /* ALUA Target Port Group ID */
 217         u16     alua_tg_pt_gps_counter;
 218         u32     alua_tg_pt_gps_count;
 219         spinlock_t tg_pt_gps_lock;
 220         struct se_subsystem_dev *t10_sub_dev;
 221         /* Used for default ALUA Target Port Group */
 222         struct t10_alua_tg_pt_gp *default_tg_pt_gp;
 223         /* Used for default ALUA Target Port Group ConfigFS group */
 224         struct config_group alua_tg_pt_gps_group;
 225         int (*alua_state_check)(struct se_cmd *, unsigned char *, u8 *);
 226         struct list_head tg_pt_gps_list;
 227 } ____cacheline_aligned;
 228
 229 struct t10_alua_lu_gp {
 230         u16     lu_gp_id;
 231         int     lu_gp_valid_id;
 232         u32     lu_gp_members;
 233         atomic_t lu_gp_shutdown;
 234         atomic_t lu_gp_ref_cnt;
 235         spinlock_t lu_gp_lock;
 236         struct config_group lu_gp_group;
 237         struct list_head lu_gp_list;
 238         struct list_head lu_gp_mem_list;
 239 } ____cacheline_aligned;
 240
 241 struct t10_alua_lu_gp_member {
 242         bool lu_gp_assoc;
 243         atomic_t lu_gp_mem_ref_cnt;
 244         spinlock_t lu_gp_mem_lock;
 245         struct t10_alua_lu_gp *lu_gp;
 246         struct se_device *lu_gp_mem_dev;
 247         struct list_head lu_gp_mem_list;
 248 } ____cacheline_aligned;
 249
 250 struct t10_alua_tg_pt_gp {
 251         u16     tg_pt_gp_id;
 252         int     tg_pt_gp_valid_id;
 253         int     tg_pt_gp_alua_access_status;
 254         int     tg_pt_gp_alua_access_type;
 255         int     tg_pt_gp_nonop_delay_msecs;
 256         int     tg_pt_gp_trans_delay_msecs;
 257         int     tg_pt_gp_pref;
 258         int     tg_pt_gp_write_metadata;
 259         /* Used by struct t10_alua_tg_pt_gp->tg_pt_gp_md_buf_len */
 260 #define ALUA_MD_BUF_LEN                         1024
 261         u32     tg_pt_gp_md_buf_len;
 262         u32     tg_pt_gp_members;
 263         atomic_t tg_pt_gp_alua_access_state;
 264         atomic_t tg_pt_gp_ref_cnt;
 265         spinlock_t tg_pt_gp_lock;
 266         struct mutex tg_pt_gp_md_mutex;
 267         struct se_subsystem_dev *tg_pt_gp_su_dev;
 268         struct config_group tg_pt_gp_group;
 269         struct list_head tg_pt_gp_list;
 270         struct list_head tg_pt_gp_mem_list;
 271 } ____cacheline_aligned;
 272
 273 struct t10_alua_tg_pt_gp_member {
 274         bool tg_pt_gp_assoc;
 275         atomic_t tg_pt_gp_mem_ref_cnt;
 276         spinlock_t tg_pt_gp_mem_lock;
 277         struct t10_alua_tg_pt_gp *tg_pt_gp;
 278         struct se_port *tg_pt;
 279         struct list_head tg_pt_gp_mem_list;
 280 } ____cacheline_aligned;
 281
 282 struct t10_vpd {
 283         unsigned char device_identifier[INQUIRY_VPD_DEVICE_IDENTIFIER_LEN];
 284         int protocol_identifier_set;
 285         u32 protocol_identifier;
 286         u32 device_identifier_code_set;
 287         u32 association;
 288         u32 device_identifier_type;
 289         struct list_head vpd_list;
 290 } ____cacheline_aligned;
 291
 292 struct t10_wwn {
 293         unsigned char vendor[8];
 294         unsigned char model[16];
 295         unsigned char revision[4];
 296         unsigned char unit_serial[INQUIRY_VPD_SERIAL_LEN];
 297         spinlock_t t10_vpd_lock;
 298         struct se_subsystem_dev *t10_sub_dev;
 299         struct config_group t10_wwn_group;
 300         struct list_head t10_vpd_list;
 301 } ____cacheline_aligned;
 302
 303
 304 /*
 305  * Used by TCM Core internally to signal if >= SPC-3 peristent reservations
 306  * emulation is enabled or disabled, or running in with TCM/pSCSI passthrough
 307  * mode
 308  */
 309 typedef enum {
 310         SPC_PASSTHROUGH,
 311         SPC2_RESERVATIONS,
 312         SPC3_PERSISTENT_RESERVATIONS
 313 } t10_reservations_index_t;
 314
 315 struct t10_pr_registration {
 316         /* Used for fabrics that contain WWN+ISID */
 317 #define PR_REG_ISID_LEN                         16
 318         /* PR_REG_ISID_LEN + ',i,0x' */
 319 #define PR_REG_ISID_ID_LEN                      (PR_REG_ISID_LEN + 5)
 320         char pr_reg_isid[PR_REG_ISID_LEN];
 321         /* Used during APTPL metadata reading */
 322 #define PR_APTPL_MAX_IPORT_LEN                  256
 323         unsigned char pr_iport[PR_APTPL_MAX_IPORT_LEN];
 324         /* Used during APTPL metadata reading */
 325 #define PR_APTPL_MAX_TPORT_LEN                  256
 326         unsigned char pr_tport[PR_APTPL_MAX_TPORT_LEN];
 327         /* For writing out live meta data */
 328         unsigned char *pr_aptpl_buf;
 329         u16 pr_aptpl_rpti;
 330         u16 pr_reg_tpgt;
 331         /* Reservation effects all target ports */
 332         int pr_reg_all_tg_pt;
 333         /* Activate Persistence across Target Power Loss */
 334         int pr_reg_aptpl;
 335         int pr_res_holder;
 336         int pr_res_type;
 337         int pr_res_scope;
 338         /* Used for fabric initiator WWPNs using a ISID */
 339         bool isid_present_at_reg;
 340         u32 pr_res_mapped_lun;
 341         u32 pr_aptpl_target_lun;
 342         u32 pr_res_generation;
 343         u64 pr_reg_bin_isid;
 344         u64 pr_res_key;
 345         atomic_t pr_res_holders;
 346         struct se_node_acl *pr_reg_nacl;
 347         struct se_dev_entry *pr_reg_deve;
 348         struct se_lun *pr_reg_tg_pt_lun;
 349         struct list_head pr_reg_list;
 350         struct list_head pr_reg_abort_list;
 351         struct list_head pr_reg_aptpl_list;
 352         struct list_head pr_reg_atp_list;
 353         struct list_head pr_reg_atp_mem_list;
 354 } ____cacheline_aligned;
 355
 356 /*
 357  * This set of function pointer ops is set based upon SPC3_PERSISTENT_RESERVATIONS,
 358  * SPC2_RESERVATIONS or SPC_PASSTHROUGH in drivers/target/target_core_pr.c:
 359  * core_setup_reservations()
 360  */
 361 struct t10_reservation_ops {
 362         int (*t10_reservation_check)(struct se_cmd *, u32 *);
 363         int (*t10_seq_non_holder)(struct se_cmd *, unsigned char *, u32);
 364         int (*t10_pr_register)(struct se_cmd *);
 365         int (*t10_pr_clear)(struct se_cmd *);
 366 };
 367
 368 struct t10_reservation_template {
 369         /* Reservation effects all target ports */
 370         int pr_all_tg_pt;
 371         /* Activate Persistence across Target Power Loss enabled
 372          * for SCSI device */
 373         int pr_aptpl_active;
 374         /* Used by struct t10_reservation_template->pr_aptpl_buf_len */
 375 #define PR_APTPL_BUF_LEN                        8192
 376         u32 pr_aptpl_buf_len;
 377         u32 pr_generation;
 378         t10_reservations_index_t res_type;
 379         spinlock_t registration_lock;
 380         spinlock_t aptpl_reg_lock;
 381         /*
 382          * This will always be set by one individual I_T Nexus.
 383          * However with all_tg_pt=1, other I_T Nexus from the
 384          * same initiator can access PR reg/res info on a different
 385          * target port.
 386          *
 387          * There is also the 'All Registrants' case, where there is
 388          * a single *pr_res_holder of the reservation, but all
 389          * registrations are considered reservation holders.
 390          */
 391         struct se_node_acl *pr_res_holder;
 392         struct list_head registration_list;
 393         struct list_head aptpl_reg_list;
 394         struct t10_reservation_ops pr_ops;
 395 } ____cacheline_aligned;
 396
 397 struct se_queue_req {
 398         int                     state;
 399         void                    *cmd;
 400         struct list_head        qr_list;
 401 } ____cacheline_aligned;
 402
 403 struct se_queue_obj {
 404         atomic_t                queue_cnt;
 405         spinlock_t              cmd_queue_lock;
 406         struct list_head        qobj_list;
 407         wait_queue_head_t       thread_wq;
 408 } ____cacheline_aligned;
 409
 410 /*
 411  * Used one per struct se_cmd to hold all extra struct se_task
 412  * metadata.  This structure is setup and allocated in
 413  * drivers/target/target_core_transport.c:__transport_alloc_se_cmd()
 414  */
 415 struct se_transport_task {
 416         unsigned char           *t_task_cdb;
 417         unsigned char           __t_task_cdb[TCM_MAX_COMMAND_SIZE];
 418         unsigned long long      t_task_lba;
 419         int                     t_tasks_failed;
 420         int                     t_tasks_fua;
 421         bool                    t_tasks_bidi;
 422         u32                     t_task_cdbs;
 423         u32                     t_tasks_check;
 424         u32                     t_tasks_no;
 425         u32                     t_tasks_sectors;
 426         u32                     t_tasks_se_num;
 427         u32                     t_tasks_se_bidi_num;
 428         u32                     t_tasks_sg_chained_no;
 429         atomic_t                t_fe_count;
 430         atomic_t                t_se_count;
 431         atomic_t                t_task_cdbs_left;
 432         atomic_t                t_task_cdbs_ex_left;
 433         atomic_t                t_task_cdbs_timeout_left;
 434         atomic_t                t_task_cdbs_sent;
 435         atomic_t                t_transport_aborted;
 436         atomic_t                t_transport_active;
 437         atomic_t                t_transport_complete;
 438         atomic_t                t_transport_queue_active;
 439         atomic_t                t_transport_sent;
 440         atomic_t                t_transport_stop;
 441         atomic_t                t_transport_timeout;
 442         atomic_t                transport_dev_active;
 443         atomic_t                transport_lun_active;
 444         atomic_t                transport_lun_fe_stop;
 445         atomic_t                transport_lun_stop;
 446         spinlock_t              t_state_lock;
 447         struct completion       t_transport_stop_comp;
 448         struct completion       transport_lun_fe_stop_comp;
 449         struct completion       transport_lun_stop_comp;
 450         struct scatterlist      *t_tasks_sg_chained;
 451         struct scatterlist      t_tasks_sg_bounce;
 452         void                    *t_task_buf;
 453         /*
 454          * Used for pre-registered fabric SGL passthrough WRITE and READ
 455          * with the special SCF_PASSTHROUGH_CONTIG_TO_SG case for TCM_Loop
 456          * and other HW target mode fabric modules.
 457          */
 458         struct scatterlist      *t_task_pt_sgl;
 459         struct list_head        *t_mem_list;
 460         /* Used for BIDI READ */
 461         struct list_head        *t_mem_bidi_list;
 462         struct list_head        t_task_list;
 463 } ____cacheline_aligned;
 464
 465 struct se_task {
 466         unsigned char   task_sense;
 467         struct scatterlist *task_sg;
 468         struct scatterlist *task_sg_bidi;
 469         u8              task_scsi_status;
 470         u8              task_flags;
 471         int             task_error_status;
 472         int             task_state_flags;
 473         bool            task_padded_sg;
 474         unsigned long long      task_lba;
 475         u32             task_no;
 476         u32             task_sectors;
 477         u32             task_size;
 478         u32             task_sg_num;
 479         u32             task_sg_offset;
 480         enum dma_data_direction task_data_direction;
 481         struct se_cmd *task_se_cmd;
 482         struct se_device        *se_dev;
 483         struct completion       task_stop_comp;
 484         atomic_t        task_active;
 485         atomic_t        task_execute_queue;
 486         atomic_t        task_timeout;
 487         atomic_t        task_sent;
 488         atomic_t        task_stop;
 489         atomic_t        task_state_active;
 490         struct timer_list       task_timer;
 491         struct se_device *se_obj_ptr;
 492         struct list_head t_list;
 493         struct list_head t_execute_list;
 494         struct list_head t_state_list;
 495 } ____cacheline_aligned;
 496
 497 #define TASK_CMD(task)  ((task)->task_se_cmd)
 498 #define TASK_DEV(task)  ((task)->se_dev)
 499
 500 struct se_cmd {
 501         /* SAM response code being sent to initiator */
 502         u8                      scsi_status;
 503         u8                      scsi_asc;
 504         u8                      scsi_ascq;
 505         u8                      scsi_sense_reason;
 506         u16                     scsi_sense_length;
 507         /* Delay for ALUA Active/NonOptimized state access in milliseconds */
 508         int                     alua_nonop_delay;
 509         /* See include/linux/dma-mapping.h */
 510         enum dma_data_direction data_direction;
 511         /* For SAM Task Attribute */
 512         int                     sam_task_attr;
 513         /* Transport protocol dependent state, see transport_state_table */
 514         enum transport_state_table t_state;
 515         /* Transport protocol dependent state for out of order CmdSNs */
 516         int                     deferred_t_state;
 517         /* Transport specific error status */
 518         int                     transport_error_status;
 519         /* See se_cmd_flags_table */
 520         u32                     se_cmd_flags;
 521         u32                     se_ordered_id;
 522         /* Total size in bytes associated with command */
 523         u32                     data_length;
 524         /* SCSI Presented Data Transfer Length */
 525         u32                     cmd_spdtl;
 526         u32                     residual_count;
 527         u32                     orig_fe_lun;
 528         /* Persistent Reservation key */
 529         u64                     pr_res_key;
 530         atomic_t                transport_sent;
 531         /* Used for sense data */
 532         void                    *sense_buffer;
 533         struct list_head        se_delayed_list;
 534         struct list_head        se_ordered_list;
 535         struct list_head        se_lun_list;
 536         struct se_device      *se_dev;
 537         struct se_dev_entry   *se_deve;
 538         struct se_device        *se_obj_ptr;
 539         struct se_device        *se_orig_obj_ptr;
 540         struct se_lun           *se_lun;
 541         /* Only used for internal passthrough and legacy TCM fabric modules */
 542         struct se_session       *se_sess;
 543         struct se_tmr_req       *se_tmr_req;
 544         /* t_task is setup to t_task_backstore in transport_init_se_cmd() */
 545         struct se_transport_task *t_task;
 546         struct se_transport_task t_task_backstore;
 547         struct target_core_fabric_ops *se_tfo;
 548         int (*transport_emulate_cdb)(struct se_cmd *);
 549         void (*transport_split_cdb)(unsigned long long, u32 *, unsigned char *);
 550         void (*transport_wait_for_tasks)(struct se_cmd *, int, int);
 551         void (*transport_complete_callback)(struct se_cmd *);
 552 } ____cacheline_aligned;
 553
 554 #define T_TASK(cmd)     ((cmd)->t_task)
 555 #define CMD_TFO(cmd)    ((cmd)->se_tfo)
 556
 557 struct se_tmr_req {
 558         /* Task Management function to be preformed */
 559         u8                      function;
 560         /* Task Management response to send */
 561         u8                      response;
 562         int                     call_transport;
 563         /* Reference to ITT that Task Mgmt should be preformed */
 564         u32                     ref_task_tag;
 565         /* 64-bit encoded SAM LUN from $FABRIC_MOD TMR header */
 566         u64                     ref_task_lun;
 567         void                    *fabric_tmr_ptr;
 568         struct se_cmd           *task_cmd;
 569         struct se_cmd           *ref_cmd;
 570         struct se_device        *tmr_dev;
 571         struct se_lun           *tmr_lun;
 572         struct list_head        tmr_list;
 573 } ____cacheline_aligned;
 574
 575 struct se_ua {
 576         u8                      ua_asc;
 577         u8                      ua_ascq;
 578         struct se_node_acl      *ua_nacl;
 579         struct list_head        ua_dev_list;
 580         struct list_head        ua_nacl_list;
 581 } ____cacheline_aligned;
 582
 583 struct se_node_acl {
 584         char                    initiatorname[TRANSPORT_IQN_LEN];
 585         /* Used to signal demo mode created ACL, disabled by default */
 586         bool                    dynamic_node_acl;
 587         u32                     queue_depth;
 588         u32                     acl_index;
 589         u64                     num_cmds;
 590         u64                     read_bytes;
 591         u64                     write_bytes;
 592         spinlock_t              stats_lock;
 593         /* Used for PR SPEC_I_PT=1 and REGISTER_AND_MOVE */
 594         atomic_t                acl_pr_ref_count;
 595         struct se_dev_entry     *device_list;
 596         struct se_session       *nacl_sess;
 597         struct se_portal_group *se_tpg;
 598         spinlock_t              device_list_lock;
 599         spinlock_t              nacl_sess_lock;
 600         struct config_group     acl_group;
 601         struct config_group     acl_attrib_group;
 602         struct config_group     acl_auth_group;
 603         struct config_group     acl_param_group;
 604         struct config_group     acl_fabric_stat_group;
 605         struct config_group     *acl_default_groups[5];
 606         struct list_head        acl_list;
 607         struct list_head        acl_sess_list;
 608 } ____cacheline_aligned;
 609
 610 struct se_session {
 611         u64                     sess_bin_isid;
 612         struct se_node_acl      *se_node_acl;
 613         struct se_portal_group *se_tpg;
 614         void                    *fabric_sess_ptr;
 615         struct list_head        sess_list;
 616         struct list_head        sess_acl_list;
 617 } ____cacheline_aligned;
 618
 619 #define SE_SESS(cmd)            ((cmd)->se_sess)
 620 #define SE_NODE_ACL(sess)       ((sess)->se_node_acl)
 621
 622 struct se_device;
 623 struct se_transform_info;
 624 struct scatterlist;
 625
 626 struct se_ml_stat_grps {
 627         struct config_group     stat_group;
 628         struct config_group     scsi_auth_intr_group;
 629         struct config_group     scsi_att_intr_port_group;
 630 };
 631
 632 struct se_lun_acl {
 633         char                    initiatorname[TRANSPORT_IQN_LEN];
 634         u32                     mapped_lun;
 635         struct se_node_acl      *se_lun_nacl;
 636         struct se_lun           *se_lun;
 637         struct list_head        lacl_list;
 638         struct config_group     se_lun_group;
 639         struct se_ml_stat_grps  ml_stat_grps;
 640 }  ____cacheline_aligned;
 641
 642 #define ML_STAT_GRPS(lacl)      (&(lacl)->ml_stat_grps)
 643
 644 struct se_dev_entry {
 645         bool                    def_pr_registered;
 646         /* See transport_lunflags_table */
 647         u32                     lun_flags;
 648         u32                     deve_cmds;
 649         u32                     mapped_lun;
 650         u32                     average_bytes;
 651         u32                     last_byte_count;
 652         u32                     total_cmds;
 653         u32                     total_bytes;
 654         u64                     pr_res_key;
 655         u64                     creation_time;
 656         u32                     attach_count;
 657         u64                     read_bytes;
 658         u64                     write_bytes;
 659         atomic_t                ua_count;
 660         /* Used for PR SPEC_I_PT=1 and REGISTER_AND_MOVE */
 661         atomic_t                pr_ref_count;
 662         struct se_lun_acl       *se_lun_acl;
 663         spinlock_t              ua_lock;
 664         struct se_lun           *se_lun;
 665         struct list_head        alua_port_list;
 666         struct list_head        ua_list;
 667 }  ____cacheline_aligned;
 668
 669 struct se_dev_limits {
 670         /* Max supported HW queue depth */
 671         u32             hw_queue_depth;
 672         /* Max supported virtual queue depth */
 673         u32             queue_depth;
 674         /* From include/linux/blkdev.h for the other HW/SW limits. */
 675         struct queue_limits limits;
 676 } ____cacheline_aligned;
 677
 678 struct se_dev_attrib {
 679         int             emulate_dpo;
 680         int             emulate_fua_write;
 681         int             emulate_fua_read;
 682         int             emulate_write_cache;
 683         int             emulate_ua_intlck_ctrl;
 684         int             emulate_tas;
 685         int             emulate_tpu;
 686         int             emulate_tpws;
 687         int             emulate_reservations;
 688         int             emulate_alua;
 689         int             enforce_pr_isids;
 690         u32             hw_block_size;
 691         u32             block_size;
 692         u32             hw_max_sectors;
 693         u32             max_sectors;
 694         u32             optimal_sectors;
 695         u32             hw_queue_depth;
 696         u32             queue_depth;
 697         u32             task_timeout;
 698         u32             max_unmap_lba_count;
 699         u32             max_unmap_block_desc_count;
 700         u32             unmap_granularity;
 701         u32             unmap_granularity_alignment;
 702         struct se_subsystem_dev *da_sub_dev;
 703         struct config_group da_group;
 704 } ____cacheline_aligned;
 705
 706 struct se_dev_stat_grps {
 707         struct config_group stat_group;
 708         struct config_group scsi_dev_group;
 709         struct config_group scsi_tgt_dev_group;
 710         struct config_group scsi_lu_group;
 711 };
 712
 713 struct se_subsystem_dev {
 714 /* Used for struct se_subsystem_dev-->se_dev_alias, must be less than PAGE_SIZE */
 715 #define SE_DEV_ALIAS_LEN                512
 716         unsigned char   se_dev_alias[SE_DEV_ALIAS_LEN];
 717 /* Used for struct se_subsystem_dev->se_dev_udev_path[], must be less than PAGE_SIZE */
 718 #define SE_UDEV_PATH_LEN                512
 719         unsigned char   se_dev_udev_path[SE_UDEV_PATH_LEN];
 720         u32             su_dev_flags;
 721         struct se_hba *se_dev_hba;
 722         struct se_device *se_dev_ptr;
 723         struct se_dev_attrib se_dev_attrib;
 724         /* T10 Asymmetric Logical Unit Assignment for Target Ports */
 725         struct t10_alua t10_alua;
 726         /* T10 Inquiry and VPD WWN Information */
 727         struct t10_wwn  t10_wwn;
 728         /* T10 SPC-2 + SPC-3 Reservations */
 729         struct t10_reservation_template t10_reservation;
 730         spinlock_t      se_dev_lock;
 731         void            *se_dev_su_ptr;
 732         struct list_head g_se_dev_list;
 733         struct config_group se_dev_group;
 734         /* For T10 Reservations */
 735         struct config_group se_dev_pr_group;
 736         /* For target_core_stat.c groups */
 737         struct se_dev_stat_grps dev_stat_grps;
 738 } ____cacheline_aligned;
 739
 740 #define T10_ALUA(su_dev)        (&(su_dev)->t10_alua)
 741 #define T10_RES(su_dev)         (&(su_dev)->t10_reservation)
 742 #define T10_PR_OPS(su_dev)      (&(su_dev)->t10_reservation.pr_ops)
 743 #define DEV_STAT_GRP(dev)       (&(dev)->dev_stat_grps)
 744
 745 struct se_device {
 746         /* Set to 1 if thread is NOT sleeping on thread_sem */
 747         u8                      thread_active;
 748         u8                      dev_status_timer_flags;
 749         /* RELATIVE TARGET PORT IDENTIFER Counter */
 750         u16                     dev_rpti_counter;
 751         /* Used for SAM Task Attribute ordering */
 752         u32                     dev_cur_ordered_id;
 753         u32                     dev_flags;
 754         u32                     dev_port_count;
 755         /* See transport_device_status_table */
 756         u32                     dev_status;
 757         u32                     dev_tcq_window_closed;
 758         /* Physical device queue depth */
 759         u32                     queue_depth;
 760         /* Used for SPC-2 reservations enforce of ISIDs */
 761         u64                     dev_res_bin_isid;
 762         t10_task_attr_index_t   dev_task_attr_type;
 763         /* Pointer to transport specific device structure */
 764         void                    *dev_ptr;
 765         u32                     dev_index;
 766         u64                     creation_time;
 767         u32                     num_resets;
 768         u64                     num_cmds;
 769         u64                     read_bytes;
 770         u64                     write_bytes;
 771         spinlock_t              stats_lock;
 772         /* Active commands on this virtual SE device */
 773         atomic_t                active_cmds;
 774         atomic_t                simple_cmds;
 775         atomic_t                depth_left;
 776         atomic_t                dev_ordered_id;
 777         atomic_t                dev_tur_active;
 778         atomic_t                execute_tasks;
 779         atomic_t                dev_status_thr_count;
 780         atomic_t                dev_hoq_count;
 781         atomic_t                dev_ordered_sync;
 782         struct se_obj           dev_obj;
 783         struct se_obj           dev_access_obj;
 784         struct se_obj           dev_export_obj;
 785         struct se_queue_obj     *dev_queue_obj;
 786         struct se_queue_obj     *dev_status_queue_obj;
 787         spinlock_t              delayed_cmd_lock;
 788         spinlock_t              ordered_cmd_lock;
 789         spinlock_t              execute_task_lock;
 790         spinlock_t              state_task_lock;
 791         spinlock_t              dev_alua_lock;
 792         spinlock_t              dev_reservation_lock;
 793         spinlock_t              dev_state_lock;
 794         spinlock_t              dev_status_lock;
 795         spinlock_t              dev_status_thr_lock;
 796         spinlock_t              se_port_lock;
 797         spinlock_t              se_tmr_lock;
 798         /* Used for legacy SPC-2 reservationsa */
 799         struct se_node_acl      *dev_reserved_node_acl;
 800         /* Used for ALUA Logical Unit Group membership */
 801         struct t10_alua_lu_gp_member *dev_alua_lu_gp_mem;
 802         /* Used for SPC-3 Persistent Reservations */
 803         struct t10_pr_registration *dev_pr_res_holder;
 804         struct list_head        dev_sep_list;
 805         struct list_head        dev_tmr_list;
 806         struct timer_list       dev_status_timer;
 807         /* Pointer to descriptor for processing thread */
 808         struct task_struct      *process_thread;
 809         pid_t                   process_thread_pid;
 810         struct task_struct              *dev_mgmt_thread;
 811         struct list_head        delayed_cmd_list;
 812         struct list_head        ordered_cmd_list;
 813         struct list_head        execute_task_list;
 814         struct list_head        state_task_list;
 815         /* Pointer to associated SE HBA */
 816         struct se_hba           *se_hba;
 817         struct se_subsystem_dev *se_sub_dev;
 818         /* Pointer to template of function pointers for transport */
 819         struct se_subsystem_api *transport;
 820         /* Linked list for struct se_hba struct se_device list */
 821         struct list_head        dev_list;
 822         /* Linked list for struct se_global->g_se_dev_list */
 823         struct list_head        g_se_dev_list;
 824 }  ____cacheline_aligned;
 825
 826 #define SE_DEV(cmd)             ((cmd)->se_lun->lun_se_dev)
 827 #define SU_DEV(dev)             ((dev)->se_sub_dev)
 828 #define DEV_ATTRIB(dev)         (&(dev)->se_sub_dev->se_dev_attrib)
 829 #define DEV_T10_WWN(dev)        (&(dev)->se_sub_dev->t10_wwn)
 830
 831 struct se_hba {
 832         u16                     hba_tpgt;
 833         u32                     hba_id;
 834         /* See hba_flags_table */
 835         u32                     hba_flags;
 836         /* Virtual iSCSI devices attached. */
 837         u32                     dev_count;
 838         u32                     hba_index;
 839         atomic_t                load_balance_queue;
 840         atomic_t                left_queue_depth;
 841         /* Maximum queue depth the HBA can handle. */
 842         atomic_t                max_queue_depth;
 843         /* Pointer to transport specific host structure. */
 844         void                    *hba_ptr;
 845         /* Linked list for struct se_device */
 846         struct list_head        hba_dev_list;
 847         struct list_head        hba_list;
 848         spinlock_t              device_lock;
 849         spinlock_t              hba_queue_lock;
 850         struct config_group     hba_group;
 851         struct mutex            hba_access_mutex;
 852         struct se_subsystem_api *transport;
 853 }  ____cacheline_aligned;
 854
 855 #define SE_HBA(dev)             ((dev)->se_hba)
 856
 857 struct se_port_stat_grps {
 858         struct config_group stat_group;
 859         struct config_group scsi_port_group;
 860         struct config_group scsi_tgt_port_group;
 861         struct config_group scsi_transport_group;
 862 };
 863
 864 struct se_lun {
 865         /* See transport_lun_status_table */
 866         enum transport_lun_status_table lun_status;
 867         u32                     lun_access;
 868         u32                     lun_flags;
 869         u32                     unpacked_lun;
 870         atomic_t                lun_acl_count;
 871         spinlock_t              lun_acl_lock;
 872         spinlock_t              lun_cmd_lock;
 873         spinlock_t              lun_sep_lock;
 874         struct completion       lun_shutdown_comp;
 875         struct list_head        lun_cmd_list;
 876         struct list_head        lun_acl_list;
 877         struct se_device        *lun_se_dev;
 878         struct se_port          *lun_sep;
 879         struct config_group     lun_group;
 880         struct se_port_stat_grps port_stat_grps;
 881 } ____cacheline_aligned;
 882
 883 #define SE_LUN(cmd)             ((cmd)->se_lun)
 884 #define PORT_STAT_GRP(lun)      (&(lun)->port_stat_grps)
 885
 886 struct scsi_port_stats {
 887        u64     cmd_pdus;
 888        u64     tx_data_octets;
 889        u64     rx_data_octets;
 890 } ____cacheline_aligned;
 891
 892 struct se_port {
 893         /* RELATIVE TARGET PORT IDENTIFER */
 894         u16             sep_rtpi;
 895         int             sep_tg_pt_secondary_stat;
 896         int             sep_tg_pt_secondary_write_md;
 897         u32             sep_index;
 898         struct scsi_port_stats sep_stats;
 899         /* Used for ALUA Target Port Groups membership */
 900         atomic_t        sep_tg_pt_gp_active;
 901         atomic_t        sep_tg_pt_secondary_offline;
 902         /* Used for PR ALL_TG_PT=1 */
 903         atomic_t        sep_tg_pt_ref_cnt;
 904         spinlock_t      sep_alua_lock;
 905         struct mutex    sep_tg_pt_md_mutex;
 906         struct t10_alua_tg_pt_gp_member *sep_alua_tg_pt_gp_mem;
 907         struct se_lun *sep_lun;
 908         struct se_portal_group *sep_tpg;
 909         struct list_head sep_alua_list;
 910         struct list_head sep_list;
 911 } ____cacheline_aligned;
 912
 913 struct se_tpg_np {
 914         struct se_portal_group *tpg_np_parent;
 915         struct config_group     tpg_np_group;
 916 } ____cacheline_aligned;
 917
 918 struct se_portal_group {
 919         /* Type of target portal group, see transport_tpg_type_table */
 920         enum transport_tpg_type_table se_tpg_type;
 921         /* Number of ACLed Initiator Nodes for this TPG */
 922         u32                     num_node_acls;
 923         /* Used for PR SPEC_I_PT=1 and REGISTER_AND_MOVE */
 924         atomic_t                tpg_pr_ref_count;
 925         /* Spinlock for adding/removing ACLed Nodes */
 926         spinlock_t              acl_node_lock;
 927         /* Spinlock for adding/removing sessions */
 928         spinlock_t              session_lock;
 929         spinlock_t              tpg_lun_lock;
 930         /* Pointer to $FABRIC_MOD portal group */
 931         void                    *se_tpg_fabric_ptr;
 932         struct list_head        se_tpg_list;
 933         /* linked list for initiator ACL list */
 934         struct list_head        acl_node_list;
 935         struct se_lun           *tpg_lun_list;
 936         struct se_lun           tpg_virt_lun0;
 937         /* List of TCM sessions assoicated wth this TPG */
 938         struct list_head        tpg_sess_list;
 939         /* Pointer to $FABRIC_MOD dependent code */
 940         struct target_core_fabric_ops *se_tpg_tfo;
 941         struct se_wwn           *se_tpg_wwn;
 942         struct config_group     tpg_group;
 943         struct config_group     *tpg_default_groups[6];
 944         struct config_group     tpg_lun_group;
 945         struct config_group     tpg_np_group;
 946         struct config_group     tpg_acl_group;
 947         struct config_group     tpg_attrib_group;
 948         struct config_group     tpg_param_group;
 949 } ____cacheline_aligned;
 950
 951 #define TPG_TFO(se_tpg) ((se_tpg)->se_tpg_tfo)
 952
 953 struct se_wwn {
 954         struct target_fabric_configfs *wwn_tf;
 955         struct config_group     wwn_group;
 956         struct config_group     *wwn_default_groups[2];
 957         struct config_group     fabric_stat_group;
 958 } ____cacheline_aligned;
 959
 960 struct se_global {
 961         u16                     alua_lu_gps_counter;
 962         int                     g_sub_api_initialized;
 963         u32                     in_shutdown;
 964         u32                     alua_lu_gps_count;
 965         u32                     g_hba_id_counter;
 966         struct config_group     target_core_hbagroup;
 967         struct config_group     alua_group;
 968         struct config_group     alua_lu_gps_group;
 969         struct list_head        g_lu_gps_list;
 970         struct list_head        g_se_tpg_list;
 971         struct list_head        g_hba_list;
 972         struct list_head        g_se_dev_list;
 973         struct se_hba           *g_lun0_hba;
 974         struct se_subsystem_dev *g_lun0_su_dev;
 975         struct se_device        *g_lun0_dev;
 976         struct t10_alua_lu_gp   *default_lu_gp;
 977         spinlock_t              g_device_lock;
 978         spinlock_t              hba_lock;
 979         spinlock_t              se_tpg_lock;
 980         spinlock_t              lu_gps_lock;
 981         spinlock_t              plugin_class_lock;
 982 } ____cacheline_aligned;
 983
 984 #endif /* TARGET_CORE_BASE_H */