include/target/iscsi/iscsi_target_core.h

   1 #ifndef ISCSI_TARGET_CORE_H
   2 #define ISCSI_TARGET_CORE_H
   3
   4 #include <linux/in.h>
   5 #include <linux/configfs.h>
   6 #include <net/sock.h>
   7 #include <net/tcp.h>
   8 #include <scsi/scsi_cmnd.h>
   9 #include <scsi/iscsi_proto.h>
  10 #include <target/target_core_base.h>
  11
  12 #define ISCSIT_VERSION                  "v4.1.0"
  13 #define ISCSI_MAX_DATASN_MISSING_COUNT  16
  14 #define ISCSI_TX_THREAD_TCP_TIMEOUT     2
  15 #define ISCSI_RX_THREAD_TCP_TIMEOUT     2
  16 #define SECONDS_FOR_ASYNC_LOGOUT        10
  17 #define SECONDS_FOR_ASYNC_TEXT          10
  18 #define SECONDS_FOR_LOGOUT_COMP         15
  19 #define WHITE_SPACE                     " \t\v\f\n\r"
  20 #define ISCSIT_MIN_TAGS                 16
  21 #define ISCSIT_EXTRA_TAGS               8
  22 #define ISCSIT_TCP_BACKLOG              256
  23 #define ISCSI_RX_THREAD_NAME            "iscsi_trx"
  24 #define ISCSI_TX_THREAD_NAME            "iscsi_ttx"
  25
  26 /* struct iscsi_node_attrib sanity values */
  27 #define NA_DATAOUT_TIMEOUT              3
  28 #define NA_DATAOUT_TIMEOUT_MAX          60
  29 #define NA_DATAOUT_TIMEOUT_MIX          2
  30 #define NA_DATAOUT_TIMEOUT_RETRIES      5
  31 #define NA_DATAOUT_TIMEOUT_RETRIES_MAX  15
  32 #define NA_DATAOUT_TIMEOUT_RETRIES_MIN  1
  33 #define NA_NOPIN_TIMEOUT                15
  34 #define NA_NOPIN_TIMEOUT_MAX            60
  35 #define NA_NOPIN_TIMEOUT_MIN            3
  36 #define NA_NOPIN_RESPONSE_TIMEOUT       30
  37 #define NA_NOPIN_RESPONSE_TIMEOUT_MAX   60
  38 #define NA_NOPIN_RESPONSE_TIMEOUT_MIN   3
  39 #define NA_RANDOM_DATAIN_PDU_OFFSETS    0
  40 #define NA_RANDOM_DATAIN_SEQ_OFFSETS    0
  41 #define NA_RANDOM_R2T_OFFSETS           0
  42
  43 /* struct iscsi_tpg_attrib sanity values */
  44 #define TA_AUTHENTICATION               1
  45 #define TA_LOGIN_TIMEOUT                15
  46 #define TA_LOGIN_TIMEOUT_MAX            30
  47 #define TA_LOGIN_TIMEOUT_MIN            5
  48 #define TA_NETIF_TIMEOUT                2
  49 #define TA_NETIF_TIMEOUT_MAX            15
  50 #define TA_NETIF_TIMEOUT_MIN            2
  51 #define TA_GENERATE_NODE_ACLS           0
  52 #define TA_DEFAULT_CMDSN_DEPTH          64
  53 #define TA_DEFAULT_CMDSN_DEPTH_MAX      512
  54 #define TA_DEFAULT_CMDSN_DEPTH_MIN      1
  55 #define TA_CACHE_DYNAMIC_ACLS           0
  56 /* Enabled by default in demo mode (generic_node_acls=1) */
  57 #define TA_DEMO_MODE_WRITE_PROTECT      1
  58 /* Disabled by default in production mode w/ explict ACLs */
  59 #define TA_PROD_MODE_WRITE_PROTECT      0
  60 #define TA_DEMO_MODE_DISCOVERY          1
  61 #define TA_DEFAULT_ERL                  0
  62 #define TA_CACHE_CORE_NPS               0
  63 /* T10 protection information disabled by default */
  64 #define TA_DEFAULT_T10_PI               0
  65 #define TA_DEFAULT_FABRIC_PROT_TYPE     0
  66
  67 #define ISCSI_IOV_DATA_BUFFER           5
  68
  69 enum iscsit_transport_type {
  70         ISCSI_TCP                               = 0,
  71         ISCSI_SCTP_TCP                          = 1,
  72         ISCSI_SCTP_UDP                          = 2,
  73         ISCSI_IWARP_TCP                         = 3,
  74         ISCSI_IWARP_SCTP                        = 4,
  75         ISCSI_INFINIBAND                        = 5,
  76 };
  77
  78 /* RFC-3720 7.1.4  Standard Connection State Diagram for a Target */
  79 enum target_conn_state_table {
  80         TARG_CONN_STATE_FREE                    = 0x1,
  81         TARG_CONN_STATE_XPT_UP                  = 0x3,
  82         TARG_CONN_STATE_IN_LOGIN                = 0x4,
  83         TARG_CONN_STATE_LOGGED_IN               = 0x5,
  84         TARG_CONN_STATE_IN_LOGOUT               = 0x6,
  85         TARG_CONN_STATE_LOGOUT_REQUESTED        = 0x7,
  86         TARG_CONN_STATE_CLEANUP_WAIT            = 0x8,
  87 };
  88
  89 /* RFC-3720 7.3.2  Session State Diagram for a Target */
  90 enum target_sess_state_table {
  91         TARG_SESS_STATE_FREE                    = 0x1,
  92         TARG_SESS_STATE_ACTIVE                  = 0x2,
  93         TARG_SESS_STATE_LOGGED_IN               = 0x3,
  94         TARG_SESS_STATE_FAILED                  = 0x4,
  95         TARG_SESS_STATE_IN_CONTINUE             = 0x5,
  96 };
  97
  98 /* struct iscsi_data_count->type */
  99 enum data_count_type {
 100         ISCSI_RX_DATA   = 1,
 101         ISCSI_TX_DATA   = 2,
 102 };
 103
 104 /* struct iscsi_datain_req->dr_complete */
 105 enum datain_req_comp_table {
 106         DATAIN_COMPLETE_NORMAL                  = 1,
 107         DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY = 2,
 108         DATAIN_COMPLETE_CONNECTION_RECOVERY     = 3,
 109 };
 110
 111 /* struct iscsi_datain_req->recovery */
 112 enum datain_req_rec_table {
 113         DATAIN_WITHIN_COMMAND_RECOVERY          = 1,
 114         DATAIN_CONNECTION_RECOVERY              = 2,
 115 };
 116
 117 /* struct iscsi_portal_group->state */
 118 enum tpg_state_table {
 119         TPG_STATE_FREE                          = 0,
 120         TPG_STATE_ACTIVE                        = 1,
 121         TPG_STATE_INACTIVE                      = 2,
 122         TPG_STATE_COLD_RESET                    = 3,
 123 };
 124
 125 /* struct iscsi_tiqn->tiqn_state */
 126 enum tiqn_state_table {
 127         TIQN_STATE_ACTIVE                       = 1,
 128         TIQN_STATE_SHUTDOWN                     = 2,
 129 };
 130
 131 /* struct iscsi_cmd->cmd_flags */
 132 enum cmd_flags_table {
 133         ICF_GOT_LAST_DATAOUT                    = 0x00000001,
 134         ICF_GOT_DATACK_SNACK                    = 0x00000002,
 135         ICF_NON_IMMEDIATE_UNSOLICITED_DATA      = 0x00000004,
 136         ICF_SENT_LAST_R2T                       = 0x00000008,
 137         ICF_WITHIN_COMMAND_RECOVERY             = 0x00000010,
 138         ICF_CONTIG_MEMORY                       = 0x00000020,
 139         ICF_ATTACHED_TO_RQUEUE                  = 0x00000040,
 140         ICF_OOO_CMDSN                           = 0x00000080,
 141         ICF_SENDTARGETS_ALL                     = 0x00000100,
 142         ICF_SENDTARGETS_SINGLE                  = 0x00000200,
 143 };
 144
 145 /* struct iscsi_cmd->i_state */
 146 enum cmd_i_state_table {
 147         ISTATE_NO_STATE                 = 0,
 148         ISTATE_NEW_CMD                  = 1,
 149         ISTATE_DEFERRED_CMD             = 2,
 150         ISTATE_UNSOLICITED_DATA         = 3,
 151         ISTATE_RECEIVE_DATAOUT          = 4,
 152         ISTATE_RECEIVE_DATAOUT_RECOVERY = 5,
 153         ISTATE_RECEIVED_LAST_DATAOUT    = 6,
 154         ISTATE_WITHIN_DATAOUT_RECOVERY  = 7,
 155         ISTATE_IN_CONNECTION_RECOVERY   = 8,
 156         ISTATE_RECEIVED_TASKMGT         = 9,
 157         ISTATE_SEND_ASYNCMSG            = 10,
 158         ISTATE_SENT_ASYNCMSG            = 11,
 159         ISTATE_SEND_DATAIN              = 12,
 160         ISTATE_SEND_LAST_DATAIN         = 13,
 161         ISTATE_SENT_LAST_DATAIN         = 14,
 162         ISTATE_SEND_LOGOUTRSP           = 15,
 163         ISTATE_SENT_LOGOUTRSP           = 16,
 164         ISTATE_SEND_NOPIN               = 17,
 165         ISTATE_SENT_NOPIN               = 18,
 166         ISTATE_SEND_REJECT              = 19,
 167         ISTATE_SENT_REJECT              = 20,
 168         ISTATE_SEND_R2T                 = 21,
 169         ISTATE_SENT_R2T                 = 22,
 170         ISTATE_SEND_R2T_RECOVERY        = 23,
 171         ISTATE_SENT_R2T_RECOVERY        = 24,
 172         ISTATE_SEND_LAST_R2T            = 25,
 173         ISTATE_SENT_LAST_R2T            = 26,
 174         ISTATE_SEND_LAST_R2T_RECOVERY   = 27,
 175         ISTATE_SENT_LAST_R2T_RECOVERY   = 28,
 176         ISTATE_SEND_STATUS              = 29,
 177         ISTATE_SEND_STATUS_BROKEN_PC    = 30,
 178         ISTATE_SENT_STATUS              = 31,
 179         ISTATE_SEND_STATUS_RECOVERY     = 32,
 180         ISTATE_SENT_STATUS_RECOVERY     = 33,
 181         ISTATE_SEND_TASKMGTRSP          = 34,
 182         ISTATE_SENT_TASKMGTRSP          = 35,
 183         ISTATE_SEND_TEXTRSP             = 36,
 184         ISTATE_SENT_TEXTRSP             = 37,
 185         ISTATE_SEND_NOPIN_WANT_RESPONSE = 38,
 186         ISTATE_SENT_NOPIN_WANT_RESPONSE = 39,
 187         ISTATE_SEND_NOPIN_NO_RESPONSE   = 40,
 188         ISTATE_REMOVE                   = 41,
 189         ISTATE_FREE                     = 42,
 190 };
 191
 192 /* Used for iscsi_recover_cmdsn() return values */
 193 enum recover_cmdsn_ret_table {
 194         CMDSN_ERROR_CANNOT_RECOVER      = -1,
 195         CMDSN_NORMAL_OPERATION          = 0,
 196         CMDSN_LOWER_THAN_EXP            = 1,
 197         CMDSN_HIGHER_THAN_EXP           = 2,
 198         CMDSN_MAXCMDSN_OVERRUN          = 3,
 199 };
 200
 201 /* Used for iscsi_handle_immediate_data() return values */
 202 enum immedate_data_ret_table {
 203         IMMEDIATE_DATA_CANNOT_RECOVER   = -1,
 204         IMMEDIATE_DATA_NORMAL_OPERATION = 0,
 205         IMMEDIATE_DATA_ERL1_CRC_FAILURE = 1,
 206 };
 207
 208 /* Used for iscsi_decide_dataout_action() return values */
 209 enum dataout_action_ret_table {
 210         DATAOUT_CANNOT_RECOVER          = -1,
 211         DATAOUT_NORMAL                  = 0,
 212         DATAOUT_SEND_R2T                = 1,
 213         DATAOUT_SEND_TO_TRANSPORT       = 2,
 214         DATAOUT_WITHIN_COMMAND_RECOVERY = 3,
 215 };
 216
 217 /* Used for struct iscsi_node_auth->naf_flags */
 218 enum naf_flags_table {
 219         NAF_USERID_SET                  = 0x01,
 220         NAF_PASSWORD_SET                = 0x02,
 221         NAF_USERID_IN_SET               = 0x04,
 222         NAF_PASSWORD_IN_SET             = 0x08,
 223 };
 224
 225 /* Used by various struct timer_list to manage iSCSI specific state */
 226 enum iscsi_timer_flags_table {
 227         ISCSI_TF_RUNNING                = 0x01,
 228         ISCSI_TF_STOP                   = 0x02,
 229         ISCSI_TF_EXPIRED                = 0x04,
 230 };
 231
 232 /* Used for struct iscsi_np->np_flags */
 233 enum np_flags_table {
 234         NPF_IP_NETWORK          = 0x00,
 235 };
 236
 237 /* Used for struct iscsi_np->np_thread_state */
 238 enum np_thread_state_table {
 239         ISCSI_NP_THREAD_ACTIVE          = 1,
 240         ISCSI_NP_THREAD_INACTIVE        = 2,
 241         ISCSI_NP_THREAD_RESET           = 3,
 242         ISCSI_NP_THREAD_SHUTDOWN        = 4,
 243         ISCSI_NP_THREAD_EXIT            = 5,
 244 };
 245
 246 struct iscsi_conn_ops {
 247         u8      HeaderDigest;                   /* [0,1] == [None,CRC32C] */
 248         u8      DataDigest;                     /* [0,1] == [None,CRC32C] */
 249         u32     MaxRecvDataSegmentLength;       /* [512..2**24-1] */
 250         u32     MaxXmitDataSegmentLength;       /* [512..2**24-1] */
 251         u8      OFMarker;                       /* [0,1] == [No,Yes] */
 252         u8      IFMarker;                       /* [0,1] == [No,Yes] */
 253         u32     OFMarkInt;                      /* [1..65535] */
 254         u32     IFMarkInt;                      /* [1..65535] */
 255         /*
 256          * iSER specific connection parameters
 257          */
 258         u32     InitiatorRecvDataSegmentLength; /* [512..2**24-1] */
 259         u32     TargetRecvDataSegmentLength;    /* [512..2**24-1] */
 260 };
 261
 262 struct iscsi_sess_ops {
 263         char    InitiatorName[224];
 264         char    InitiatorAlias[256];
 265         char    TargetName[224];
 266         char    TargetAlias[256];
 267         char    TargetAddress[256];
 268         u16     TargetPortalGroupTag;           /* [0..65535] */
 269         u16     MaxConnections;                 /* [1..65535] */
 270         u8      InitialR2T;                     /* [0,1] == [No,Yes] */
 271         u8      ImmediateData;                  /* [0,1] == [No,Yes] */
 272         u32     MaxBurstLength;                 /* [512..2**24-1] */
 273         u32     FirstBurstLength;               /* [512..2**24-1] */
 274         u16     DefaultTime2Wait;               /* [0..3600] */
 275         u16     DefaultTime2Retain;             /* [0..3600] */
 276         u16     MaxOutstandingR2T;              /* [1..65535] */
 277         u8      DataPDUInOrder;                 /* [0,1] == [No,Yes] */
 278         u8      DataSequenceInOrder;            /* [0,1] == [No,Yes] */
 279         u8      ErrorRecoveryLevel;             /* [0..2] */
 280         u8      SessionType;                    /* [0,1] == [Normal,Discovery]*/
 281         /*
 282          * iSER specific session parameters
 283          */
 284         u8      RDMAExtensions;                 /* [0,1] == [No,Yes] */
 285 };
 286
 287 struct iscsi_queue_req {
 288         int                     state;
 289         struct iscsi_cmd        *cmd;
 290         struct list_head        qr_list;
 291 };
 292
 293 struct iscsi_data_count {
 294         int                     data_length;
 295         int                     sync_and_steering;
 296         enum data_count_type    type;
 297         u32                     iov_count;
 298         u32                     ss_iov_count;
 299         u32                     ss_marker_count;
 300         struct kvec             *iov;
 301 };
 302
 303 struct iscsi_param_list {
 304         bool                    iser;
 305         struct list_head        param_list;
 306         struct list_head        extra_response_list;
 307 };
 308
 309 struct iscsi_datain_req {
 310         enum datain_req_comp_table dr_complete;
 311         int                     generate_recovery_values;
 312         enum datain_req_rec_table recovery;
 313         u32                     begrun;
 314         u32                     runlength;
 315         u32                     data_length;
 316         u32                     data_offset;
 317         u32                     data_sn;
 318         u32                     next_burst_len;
 319         u32                     read_data_done;
 320         u32                     seq_send_order;
 321         struct list_head        cmd_datain_node;
 322 } ____cacheline_aligned;
 323
 324 struct iscsi_ooo_cmdsn {
 325         u16                     cid;
 326         u32                     batch_count;
 327         u32                     cmdsn;
 328         u32                     exp_cmdsn;
 329         struct iscsi_cmd        *cmd;
 330         struct list_head        ooo_list;
 331 } ____cacheline_aligned;
 332
 333 struct iscsi_datain {
 334         u8                      flags;
 335         u32                     data_sn;
 336         u32                     length;
 337         u32                     offset;
 338 } ____cacheline_aligned;
 339
 340 struct iscsi_r2t {
 341         int                     seq_complete;
 342         int                     recovery_r2t;
 343         int                     sent_r2t;
 344         u32                     r2t_sn;
 345         u32                     offset;
 346         u32                     targ_xfer_tag;
 347         u32                     xfer_len;
 348         struct list_head        r2t_list;
 349 } ____cacheline_aligned;
 350
 351 struct iscsi_cmd {
 352         enum iscsi_timer_flags_table dataout_timer_flags;
 353         /* DataOUT timeout retries */
 354         u8                      dataout_timeout_retries;
 355         /* Within command recovery count */
 356         u8                      error_recovery_count;
 357         /* iSCSI dependent state for out or order CmdSNs */
 358         enum cmd_i_state_table  deferred_i_state;
 359         /* iSCSI dependent state */
 360         enum cmd_i_state_table  i_state;
 361         /* Command is an immediate command (ISCSI_OP_IMMEDIATE set) */
 362         u8                      immediate_cmd;
 363         /* Immediate data present */
 364         u8                      immediate_data;
 365         /* iSCSI Opcode */
 366         u8                      iscsi_opcode;
 367         /* iSCSI Response Code */
 368         u8                      iscsi_response;
 369         /* Logout reason when iscsi_opcode == ISCSI_INIT_LOGOUT_CMND */
 370         u8                      logout_reason;
 371         /* Logout response code when iscsi_opcode == ISCSI_INIT_LOGOUT_CMND */
 372         u8                      logout_response;
 373         /* MaxCmdSN has been incremented */
 374         u8                      maxcmdsn_inc;
 375         /* Immediate Unsolicited Dataout */
 376         u8                      unsolicited_data;
 377         /* Reject reason code */
 378         u8                      reject_reason;
 379         /* CID contained in logout PDU when opcode == ISCSI_INIT_LOGOUT_CMND */
 380         u16                     logout_cid;
 381         /* Command flags */
 382         enum cmd_flags_table    cmd_flags;
 383         /* Initiator Task Tag assigned from Initiator */
 384         itt_t                   init_task_tag;
 385         /* Target Transfer Tag assigned from Target */
 386         u32                     targ_xfer_tag;
 387         /* CmdSN assigned from Initiator */
 388         u32                     cmd_sn;
 389         /* ExpStatSN assigned from Initiator */
 390         u32                     exp_stat_sn;
 391         /* StatSN assigned to this ITT */
 392         u32                     stat_sn;
 393         /* DataSN Counter */
 394         u32                     data_sn;
 395         /* R2TSN Counter */
 396         u32                     r2t_sn;
 397         /* Last DataSN acknowledged via DataAck SNACK */
 398         u32                     acked_data_sn;
 399         /* Used for echoing NOPOUT ping data */
 400         u32                     buf_ptr_size;
 401         /* Used to store DataDigest */
 402         u32                     data_crc;
 403         /* Counter for MaxOutstandingR2T */
 404         u32                     outstanding_r2ts;
 405         /* Next R2T Offset when DataSequenceInOrder=Yes */
 406         u32                     r2t_offset;
 407         /* Iovec current and orig count for iscsi_cmd->iov_data */
 408         u32                     iov_data_count;
 409         u32                     orig_iov_data_count;
 410         /* Number of miscellaneous iovecs used for IP stack calls */
 411         u32                     iov_misc_count;
 412         /* Number of struct iscsi_pdu in struct iscsi_cmd->pdu_list */
 413         u32                     pdu_count;
 414         /* Next struct iscsi_pdu to send in struct iscsi_cmd->pdu_list */
 415         u32                     pdu_send_order;
 416         /* Current struct iscsi_pdu in struct iscsi_cmd->pdu_list */
 417         u32                     pdu_start;
 418         /* Next struct iscsi_seq to send in struct iscsi_cmd->seq_list */
 419         u32                     seq_send_order;
 420         /* Number of struct iscsi_seq in struct iscsi_cmd->seq_list */
 421         u32                     seq_count;
 422         /* Current struct iscsi_seq in struct iscsi_cmd->seq_list */
 423         u32                     seq_no;
 424         /* Lowest offset in current DataOUT sequence */
 425         u32                     seq_start_offset;
 426         /* Highest offset in current DataOUT sequence */
 427         u32                     seq_end_offset;
 428         /* Total size in bytes received so far of READ data */
 429         u32                     read_data_done;
 430         /* Total size in bytes received so far of WRITE data */
 431         u32                     write_data_done;
 432         /* Counter for FirstBurstLength key */
 433         u32                     first_burst_len;
 434         /* Counter for MaxBurstLength key */
 435         u32                     next_burst_len;
 436         /* Transfer size used for IP stack calls */
 437         u32                     tx_size;
 438         /* Buffer used for various purposes */
 439         void                    *buf_ptr;
 440         /* Used by SendTargets=[iqn.,eui.] discovery */
 441         void                    *text_in_ptr;
 442         /* See include/linux/dma-mapping.h */
 443         enum dma_data_direction data_direction;
 444         /* iSCSI PDU Header + CRC */
 445         unsigned char           pdu[ISCSI_HDR_LEN + ISCSI_CRC_LEN];
 446         /* Number of times struct iscsi_cmd is present in immediate queue */
 447         atomic_t                immed_queue_count;
 448         atomic_t                response_queue_count;
 449         spinlock_t              datain_lock;
 450         spinlock_t              dataout_timeout_lock;
 451         /* spinlock for protecting struct iscsi_cmd->i_state */
 452         spinlock_t              istate_lock;
 453         /* spinlock for adding within command recovery entries */
 454         spinlock_t              error_lock;
 455         /* spinlock for adding R2Ts */
 456         spinlock_t              r2t_lock;
 457         /* DataIN List */
 458         struct list_head        datain_list;
 459         /* R2T List */
 460         struct list_head        cmd_r2t_list;
 461         /* Timer for DataOUT */
 462         struct timer_list       dataout_timer;
 463         /* Iovecs for SCSI data payload RX/TX w/ kernel level sockets */
 464         struct kvec             *iov_data;
 465         /* Iovecs for miscellaneous purposes */
 466 #define ISCSI_MISC_IOVECS                       5
 467         struct kvec             iov_misc[ISCSI_MISC_IOVECS];
 468         /* Array of struct iscsi_pdu used for DataPDUInOrder=No */
 469         struct iscsi_pdu        *pdu_list;
 470         /* Current struct iscsi_pdu used for DataPDUInOrder=No */
 471         struct iscsi_pdu        *pdu_ptr;
 472         /* Array of struct iscsi_seq used for DataSequenceInOrder=No */
 473         struct iscsi_seq        *seq_list;
 474         /* Current struct iscsi_seq used for DataSequenceInOrder=No */
 475         struct iscsi_seq        *seq_ptr;
 476         /* TMR Request when iscsi_opcode == ISCSI_OP_SCSI_TMFUNC */
 477         struct iscsi_tmr_req    *tmr_req;
 478         /* Connection this command is alligient to */
 479         struct iscsi_conn       *conn;
 480         /* Pointer to connection recovery entry */
 481         struct iscsi_conn_recovery *cr;
 482         /* Session the command is part of,  used for connection recovery */
 483         struct iscsi_session    *sess;
 484         /* list_head for connection list */
 485         struct list_head        i_conn_node;
 486         /* The TCM I/O descriptor that is accessed via container_of() */
 487         struct se_cmd           se_cmd;
 488         /* Sense buffer that will be mapped into outgoing status */
 489 #define ISCSI_SENSE_BUFFER_LEN          (TRANSPORT_SENSE_BUFFER + 2)
 490         unsigned char           sense_buffer[ISCSI_SENSE_BUFFER_LEN];
 491
 492         u32                     padding;
 493         u8                      pad_bytes[4];
 494
 495         struct scatterlist      *first_data_sg;
 496         u32                     first_data_sg_off;
 497         u32                     kmapped_nents;
 498         sense_reason_t          sense_reason;
 499 }  ____cacheline_aligned;
 500
 501 struct iscsi_tmr_req {
 502         bool                    task_reassign:1;
 503         u32                     exp_data_sn;
 504         struct iscsi_cmd        *ref_cmd;
 505         struct iscsi_conn_recovery *conn_recovery;
 506         struct se_tmr_req       *se_tmr_req;
 507 };
 508
 509 struct iscsi_conn {
 510         wait_queue_head_t       queues_wq;
 511         /* Authentication Successful for this connection */
 512         u8                      auth_complete;
 513         /* State connection is currently in */
 514         u8                      conn_state;
 515         u8                      conn_logout_reason;
 516         u8                      network_transport;
 517         enum iscsi_timer_flags_table nopin_timer_flags;
 518         enum iscsi_timer_flags_table nopin_response_timer_flags;
 519         /* Used to know what thread encountered a transport failure */
 520         u8                      which_thread;
 521         /* connection id assigned by the Initiator */
 522         u16                     cid;
 523         /* Remote TCP Port */
 524         u16                     login_port;
 525         u16                     local_port;
 526         int                     net_size;
 527         int                     login_family;
 528         u32                     auth_id;
 529         u32                     conn_flags;
 530         /* Used for iscsi_tx_login_rsp() */
 531         itt_t                   login_itt;
 532         u32                     exp_statsn;
 533         /* Per connection status sequence number */
 534         u32                     stat_sn;
 535         /* IFMarkInt's Current Value */
 536         u32                     if_marker;
 537         /* OFMarkInt's Current Value */
 538         u32                     of_marker;
 539         /* Used for calculating OFMarker offset to next PDU */
 540         u32                     of_marker_offset;
 541 #define IPV6_ADDRESS_SPACE                              48
 542         unsigned char           login_ip[IPV6_ADDRESS_SPACE];
 543         unsigned char           local_ip[IPV6_ADDRESS_SPACE];
 544         int                     conn_usage_count;
 545         int                     conn_waiting_on_uc;
 546         atomic_t                check_immediate_queue;
 547         atomic_t                conn_logout_remove;
 548         atomic_t                connection_exit;
 549         atomic_t                connection_recovery;
 550         atomic_t                connection_reinstatement;
 551         atomic_t                connection_wait_rcfr;
 552         atomic_t                sleep_on_conn_wait_comp;
 553         atomic_t                transport_failed;
 554         struct completion       conn_post_wait_comp;
 555         struct completion       conn_wait_comp;
 556         struct completion       conn_wait_rcfr_comp;
 557         struct completion       conn_waiting_on_uc_comp;
 558         struct completion       conn_logout_comp;
 559         struct completion       tx_half_close_comp;
 560         struct completion       rx_half_close_comp;
 561         /* socket used by this connection */
 562         struct socket           *sock;
 563         void                    (*orig_data_ready)(struct sock *);
 564         void                    (*orig_state_change)(struct sock *);
 565 #define LOGIN_FLAGS_READ_ACTIVE         1
 566 #define LOGIN_FLAGS_CLOSED              2
 567 #define LOGIN_FLAGS_READY               4
 568         unsigned long           login_flags;
 569         struct delayed_work     login_work;
 570         struct delayed_work     login_cleanup_work;
 571         struct iscsi_login      *login;
 572         struct timer_list       nopin_timer;
 573         struct timer_list       nopin_response_timer;
 574         struct timer_list       transport_timer;
 575         struct task_struct      *login_kworker;
 576         /* Spinlock used for add/deleting cmd's from conn_cmd_list */
 577         spinlock_t              cmd_lock;
 578         spinlock_t              conn_usage_lock;
 579         spinlock_t              immed_queue_lock;
 580         spinlock_t              nopin_timer_lock;
 581         spinlock_t              response_queue_lock;
 582         spinlock_t              state_lock;
 583         /* libcrypto RX and TX contexts for crc32c */
 584         struct hash_desc        conn_rx_hash;
 585         struct hash_desc        conn_tx_hash;
 586         /* Used for scheduling TX and RX connection kthreads */
 587         cpumask_var_t           conn_cpumask;
 588         unsigned int            conn_rx_reset_cpumask:1;
 589         unsigned int            conn_tx_reset_cpumask:1;
 590         /* list_head of struct iscsi_cmd for this connection */
 591         struct list_head        conn_cmd_list;
 592         struct list_head        immed_queue_list;
 593         struct list_head        response_queue_list;
 594         struct iscsi_conn_ops   *conn_ops;
 595         struct iscsi_login      *conn_login;
 596         struct iscsit_transport *conn_transport;
 597         struct iscsi_param_list *param_list;
 598         /* Used for per connection auth state machine */
 599         void                    *auth_protocol;
 600         void                    *context;
 601         struct iscsi_login_thread_s *login_thread;
 602         struct iscsi_portal_group *tpg;
 603         struct iscsi_tpg_np     *tpg_np;
 604         /* Pointer to parent session */
 605         struct iscsi_session    *sess;
 606         int                     bitmap_id;
 607         int                     rx_thread_active;
 608         struct task_struct      *rx_thread;
 609         int                     tx_thread_active;
 610         struct task_struct      *tx_thread;
 611         /* list_head for session connection list */
 612         struct list_head        conn_list;
 613 } ____cacheline_aligned;
 614
 615 struct iscsi_conn_recovery {
 616         u16                     cid;
 617         u32                     cmd_count;
 618         u32                     maxrecvdatasegmentlength;
 619         u32                     maxxmitdatasegmentlength;
 620         int                     ready_for_reallegiance;
 621         struct list_head        conn_recovery_cmd_list;
 622         spinlock_t              conn_recovery_cmd_lock;
 623         struct timer_list       time2retain_timer;
 624         struct iscsi_session    *sess;
 625         struct list_head        cr_list;
 626 }  ____cacheline_aligned;
 627
 628 struct iscsi_session {
 629         u8                      initiator_vendor;
 630         u8                      isid[6];
 631         enum iscsi_timer_flags_table time2retain_timer_flags;
 632         u8                      version_active;
 633         u16                     cid_called;
 634         u16                     conn_recovery_count;
 635         u16                     tsih;
 636         /* state session is currently in */
 637         u32                     session_state;
 638         /* session wide counter: initiator assigned task tag */
 639         itt_t                   init_task_tag;
 640         /* session wide counter: target assigned task tag */
 641         u32                     targ_xfer_tag;
 642         u32                     cmdsn_window;
 643
 644         /* protects cmdsn values */
 645         struct mutex            cmdsn_mutex;
 646         /* session wide counter: expected command sequence number */
 647         u32                     exp_cmd_sn;
 648         /* session wide counter: maximum allowed command sequence number */
 649         u32                     max_cmd_sn;
 650         struct list_head        sess_ooo_cmdsn_list;
 651
 652         /* LIO specific session ID */
 653         u32                     sid;
 654         char                    auth_type[8];
 655         /* unique within the target */
 656         int                     session_index;
 657         /* Used for session reference counting */
 658         int                     session_usage_count;
 659         int                     session_waiting_on_uc;
 660         atomic_long_t           cmd_pdus;
 661         atomic_long_t           rsp_pdus;
 662         atomic_long_t           tx_data_octets;
 663         atomic_long_t           rx_data_octets;
 664         atomic_long_t           conn_digest_errors;
 665         atomic_long_t           conn_timeout_errors;
 666         u64                     creation_time;
 667         /* Number of active connections */
 668         atomic_t                nconn;
 669         atomic_t                session_continuation;
 670         atomic_t                session_fall_back_to_erl0;
 671         atomic_t                session_logout;
 672         atomic_t                session_reinstatement;
 673         atomic_t                session_stop_active;
 674         atomic_t                sleep_on_sess_wait_comp;
 675         /* connection list */
 676         struct list_head        sess_conn_list;
 677         struct list_head        cr_active_list;
 678         struct list_head        cr_inactive_list;
 679         spinlock_t              conn_lock;
 680         spinlock_t              cr_a_lock;
 681         spinlock_t              cr_i_lock;
 682         spinlock_t              session_usage_lock;
 683         spinlock_t              ttt_lock;
 684         struct completion       async_msg_comp;
 685         struct completion       reinstatement_comp;
 686         struct completion       session_wait_comp;
 687         struct completion       session_waiting_on_uc_comp;
 688         struct timer_list       time2retain_timer;
 689         struct iscsi_sess_ops   *sess_ops;
 690         struct se_session       *se_sess;
 691         struct iscsi_portal_group *tpg;
 692 } ____cacheline_aligned;
 693
 694 struct iscsi_login {
 695         u8 auth_complete;
 696         u8 checked_for_existing;
 697         u8 current_stage;
 698         u8 leading_connection;
 699         u8 first_request;
 700         u8 version_min;
 701         u8 version_max;
 702         u8 login_complete;
 703         u8 login_failed;
 704         bool zero_tsih;
 705         char isid[6];
 706         u32 cmd_sn;
 707         itt_t init_task_tag;
 708         u32 initial_exp_statsn;
 709         u32 rsp_length;
 710         u16 cid;
 711         u16 tsih;
 712         char req[ISCSI_HDR_LEN];
 713         char rsp[ISCSI_HDR_LEN];
 714         char *req_buf;
 715         char *rsp_buf;
 716         struct iscsi_conn *conn;
 717         struct iscsi_np *np;
 718 } ____cacheline_aligned;
 719
 720 struct iscsi_node_attrib {
 721         u32                     dataout_timeout;
 722         u32                     dataout_timeout_retries;
 723         u32                     default_erl;
 724         u32                     nopin_timeout;
 725         u32                     nopin_response_timeout;
 726         u32                     random_datain_pdu_offsets;
 727         u32                     random_datain_seq_offsets;
 728         u32                     random_r2t_offsets;
 729         u32                     tmr_cold_reset;
 730         u32                     tmr_warm_reset;
 731         struct iscsi_node_acl *nacl;
 732 };
 733
 734 struct se_dev_entry_s;
 735
 736 struct iscsi_node_auth {
 737         enum naf_flags_table    naf_flags;
 738         int                     authenticate_target;
 739         /* Used for iscsit_global->discovery_auth,
 740          * set to zero (auth disabled) by default */
 741         int                     enforce_discovery_auth;
 742 #define MAX_USER_LEN                            256
 743 #define MAX_PASS_LEN                            256
 744         char                    userid[MAX_USER_LEN];
 745         char                    password[MAX_PASS_LEN];
 746         char                    userid_mutual[MAX_USER_LEN];
 747         char                    password_mutual[MAX_PASS_LEN];
 748 };
 749
 750 #include "iscsi_target_stat.h"
 751
 752 struct iscsi_node_stat_grps {
 753         struct config_group     iscsi_sess_stats_group;
 754         struct config_group     iscsi_conn_stats_group;
 755 };
 756
 757 struct iscsi_node_acl {
 758         struct iscsi_node_attrib node_attrib;
 759         struct iscsi_node_auth  node_auth;
 760         struct iscsi_node_stat_grps node_stat_grps;
 761         struct se_node_acl      se_node_acl;
 762 };
 763
 764 struct iscsi_tpg_attrib {
 765         u32                     authentication;
 766         u32                     login_timeout;
 767         u32                     netif_timeout;
 768         u32                     generate_node_acls;
 769         u32                     cache_dynamic_acls;
 770         u32                     default_cmdsn_depth;
 771         u32                     demo_mode_write_protect;
 772         u32                     prod_mode_write_protect;
 773         u32                     demo_mode_discovery;
 774         u32                     default_erl;
 775         u8                      t10_pi;
 776         u32                     fabric_prot_type;
 777         struct iscsi_portal_group *tpg;
 778 };
 779
 780 struct iscsi_np {
 781         int                     np_network_transport;
 782         int                     np_ip_proto;
 783         int                     np_sock_type;
 784         enum np_thread_state_table np_thread_state;
 785         bool                    enabled;
 786         enum iscsi_timer_flags_table np_login_timer_flags;
 787         u32                     np_exports;
 788         enum np_flags_table     np_flags;
 789         unsigned char           np_ip[IPV6_ADDRESS_SPACE];
 790         u16                     np_port;
 791         spinlock_t              np_thread_lock;
 792         struct completion       np_restart_comp;
 793         struct socket           *np_socket;
 794         struct __kernel_sockaddr_storage np_sockaddr;
 795         struct task_struct      *np_thread;
 796         struct timer_list       np_login_timer;
 797         void                    *np_context;
 798         struct iscsit_transport *np_transport;
 799         struct list_head        np_list;
 800 } ____cacheline_aligned;
 801
 802 struct iscsi_tpg_np {
 803         struct iscsi_np         *tpg_np;
 804         struct iscsi_portal_group *tpg;
 805         struct iscsi_tpg_np     *tpg_np_parent;
 806         struct list_head        tpg_np_list;
 807         struct list_head        tpg_np_child_list;
 808         struct list_head        tpg_np_parent_list;
 809         struct se_tpg_np        se_tpg_np;
 810         spinlock_t              tpg_np_parent_lock;
 811         struct completion       tpg_np_comp;
 812         struct kref             tpg_np_kref;
 813 };
 814
 815 struct iscsi_portal_group {
 816         unsigned char           tpg_chap_id;
 817         /* TPG State */
 818         enum tpg_state_table    tpg_state;
 819         /* Target Portal Group Tag */
 820         u16                     tpgt;
 821         /* Id assigned to target sessions */
 822         u16                     ntsih;
 823         /* Number of active sessions */
 824         u32                     nsessions;
 825         /* Number of Network Portals available for this TPG */
 826         u32                     num_tpg_nps;
 827         /* Per TPG LIO specific session ID. */
 828         u32                     sid;
 829         /* Spinlock for adding/removing Network Portals */
 830         spinlock_t              tpg_np_lock;
 831         spinlock_t              tpg_state_lock;
 832         struct se_portal_group tpg_se_tpg;
 833         struct mutex            tpg_access_lock;
 834         struct semaphore        np_login_sem;
 835         struct iscsi_tpg_attrib tpg_attrib;
 836         struct iscsi_node_auth  tpg_demo_auth;
 837         /* Pointer to default list of iSCSI parameters for TPG */
 838         struct iscsi_param_list *param_list;
 839         struct iscsi_tiqn       *tpg_tiqn;
 840         struct list_head        tpg_gnp_list;
 841         struct list_head        tpg_list;
 842 } ____cacheline_aligned;
 843
 844 struct iscsi_wwn_stat_grps {
 845         struct config_group     iscsi_stat_group;
 846         struct config_group     iscsi_instance_group;
 847         struct config_group     iscsi_sess_err_group;
 848         struct config_group     iscsi_tgt_attr_group;
 849         struct config_group     iscsi_login_stats_group;
 850         struct config_group     iscsi_logout_stats_group;
 851 };
 852
 853 struct iscsi_tiqn {
 854 #define ISCSI_IQN_LEN                           224
 855         unsigned char           tiqn[ISCSI_IQN_LEN];
 856         enum tiqn_state_table   tiqn_state;
 857         int                     tiqn_access_count;
 858         u32                     tiqn_active_tpgs;
 859         u32                     tiqn_ntpgs;
 860         u32                     tiqn_num_tpg_nps;
 861         u32                     tiqn_nsessions;
 862         struct list_head        tiqn_list;
 863         struct list_head        tiqn_tpg_list;
 864         spinlock_t              tiqn_state_lock;
 865         spinlock_t              tiqn_tpg_lock;
 866         struct se_wwn           tiqn_wwn;
 867         struct iscsi_wwn_stat_grps tiqn_stat_grps;
 868         int                     tiqn_index;
 869         struct iscsi_sess_err_stats  sess_err_stats;
 870         struct iscsi_login_stats     login_stats;
 871         struct iscsi_logout_stats    logout_stats;
 872 } ____cacheline_aligned;
 873
 874 struct iscsit_global {
 875         /* In core shutdown */
 876         u32                     in_shutdown;
 877         u32                     active_ts;
 878         /* Unique identifier used for the authentication daemon */
 879         u32                     auth_id;
 880         u32                     inactive_ts;
 881 #define ISCSIT_BITMAP_BITS      262144
 882         /* Thread Set bitmap pointer */
 883         unsigned long           *ts_bitmap;
 884         spinlock_t              ts_bitmap_lock;
 885         /* Used for iSCSI discovery session authentication */
 886         struct iscsi_node_acl   discovery_acl;
 887         struct iscsi_portal_group       *discovery_tpg;
 888 };
 889
 890 static inline u32 session_get_next_ttt(struct iscsi_session *session)
 891 {
 892         u32 ttt;
 893
 894         spin_lock_bh(&session->ttt_lock);
 895         ttt = session->targ_xfer_tag++;
 896         if (ttt == 0xFFFFFFFF)
 897                 ttt = session->targ_xfer_tag++;
 898         spin_unlock_bh(&session->ttt_lock);
 899
 900         return ttt;
 901 }
 902
 903 extern struct iscsi_cmd *iscsit_find_cmd_from_itt(struct iscsi_conn *, itt_t);
 904 #endif /* ISCSI_TARGET_CORE_H */