drivers/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-rc2"
  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
  21 /* struct iscsi_node_attrib sanity values */
  22 #define NA_DATAOUT_TIMEOUT              3
  23 #define NA_DATAOUT_TIMEOUT_MAX          60
  24 #define NA_DATAOUT_TIMEOUT_MIX          2
  25 #define NA_DATAOUT_TIMEOUT_RETRIES      5
  26 #define NA_DATAOUT_TIMEOUT_RETRIES_MAX  15
  27 #define NA_DATAOUT_TIMEOUT_RETRIES_MIN  1
  28 #define NA_NOPIN_TIMEOUT                15
  29 #define NA_NOPIN_TIMEOUT_MAX            60
  30 #define NA_NOPIN_TIMEOUT_MIN            3
  31 #define NA_NOPIN_RESPONSE_TIMEOUT       30
  32 #define NA_NOPIN_RESPONSE_TIMEOUT_MAX   60
  33 #define NA_NOPIN_RESPONSE_TIMEOUT_MIN   3
  34 #define NA_RANDOM_DATAIN_PDU_OFFSETS    0
  35 #define NA_RANDOM_DATAIN_SEQ_OFFSETS    0
  36 #define NA_RANDOM_R2T_OFFSETS           0
  37 #define NA_DEFAULT_ERL                  0
  38 #define NA_DEFAULT_ERL_MAX              2
  39 #define NA_DEFAULT_ERL_MIN              0
  40
  41 /* struct iscsi_tpg_attrib sanity values */
  42 #define TA_AUTHENTICATION               1
  43 #define TA_LOGIN_TIMEOUT                15
  44 #define TA_LOGIN_TIMEOUT_MAX            30
  45 #define TA_LOGIN_TIMEOUT_MIN            5
  46 #define TA_NETIF_TIMEOUT                2
  47 #define TA_NETIF_TIMEOUT_MAX            15
  48 #define TA_NETIF_TIMEOUT_MIN            2
  49 #define TA_GENERATE_NODE_ACLS           0
  50 #define TA_DEFAULT_CMDSN_DEPTH          16
  51 #define TA_DEFAULT_CMDSN_DEPTH_MAX      512
  52 #define TA_DEFAULT_CMDSN_DEPTH_MIN      1
  53 #define TA_CACHE_DYNAMIC_ACLS           0
  54 /* Enabled by default in demo mode (generic_node_acls=1) */
  55 #define TA_DEMO_MODE_WRITE_PROTECT      1
  56 /* Disabled by default in production mode w/ explict ACLs */
  57 #define TA_PROD_MODE_WRITE_PROTECT      0
  58 #define TA_CACHE_CORE_NPS               0
  59
  60
  61 #define ISCSI_IOV_DATA_BUFFER           5
  62
  63 enum iscsit_transport_type {
  64         ISCSI_TCP                               = 0,
  65         ISCSI_SCTP_TCP                          = 1,
  66         ISCSI_SCTP_UDP                          = 2,
  67         ISCSI_IWARP_TCP                         = 3,
  68         ISCSI_IWARP_SCTP                        = 4,
  69         ISCSI_INFINIBAND                        = 5,
  70 };
  71
  72 /* RFC-3720 7.1.4  Standard Connection State Diagram for a Target */
  73 enum target_conn_state_table {
  74         TARG_CONN_STATE_FREE                    = 0x1,
  75         TARG_CONN_STATE_XPT_UP                  = 0x3,
  76         TARG_CONN_STATE_IN_LOGIN                = 0x4,
  77         TARG_CONN_STATE_LOGGED_IN               = 0x5,
  78         TARG_CONN_STATE_IN_LOGOUT               = 0x6,
  79         TARG_CONN_STATE_LOGOUT_REQUESTED        = 0x7,
  80         TARG_CONN_STATE_CLEANUP_WAIT            = 0x8,
  81 };
  82
  83 /* RFC-3720 7.3.2  Session State Diagram for a Target */
  84 enum target_sess_state_table {
  85         TARG_SESS_STATE_FREE                    = 0x1,
  86         TARG_SESS_STATE_ACTIVE                  = 0x2,
  87         TARG_SESS_STATE_LOGGED_IN               = 0x3,
  88         TARG_SESS_STATE_FAILED                  = 0x4,
  89         TARG_SESS_STATE_IN_CONTINUE             = 0x5,
  90 };
  91
  92 /* struct iscsi_data_count->type */
  93 enum data_count_type {
  94         ISCSI_RX_DATA   = 1,
  95         ISCSI_TX_DATA   = 2,
  96 };
  97
  98 /* struct iscsi_datain_req->dr_complete */
  99 enum datain_req_comp_table {
 100         DATAIN_COMPLETE_NORMAL                  = 1,
 101         DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY = 2,
 102         DATAIN_COMPLETE_CONNECTION_RECOVERY     = 3,
 103 };
 104
 105 /* struct iscsi_datain_req->recovery */
 106 enum datain_req_rec_table {
 107         DATAIN_WITHIN_COMMAND_RECOVERY          = 1,
 108         DATAIN_CONNECTION_RECOVERY              = 2,
 109 };
 110
 111 /* struct iscsi_portal_group->state */
 112 enum tpg_state_table {
 113         TPG_STATE_FREE                          = 0,
 114         TPG_STATE_ACTIVE                        = 1,
 115         TPG_STATE_INACTIVE                      = 2,
 116         TPG_STATE_COLD_RESET                    = 3,
 117 };
 118
 119 /* struct iscsi_tiqn->tiqn_state */
 120 enum tiqn_state_table {
 121         TIQN_STATE_ACTIVE                       = 1,
 122         TIQN_STATE_SHUTDOWN                     = 2,
 123 };
 124
 125 /* struct iscsi_cmd->cmd_flags */
 126 enum cmd_flags_table {
 127         ICF_GOT_LAST_DATAOUT                    = 0x00000001,
 128         ICF_GOT_DATACK_SNACK                    = 0x00000002,
 129         ICF_NON_IMMEDIATE_UNSOLICITED_DATA      = 0x00000004,
 130         ICF_SENT_LAST_R2T                       = 0x00000008,
 131         ICF_WITHIN_COMMAND_RECOVERY             = 0x00000010,
 132         ICF_CONTIG_MEMORY                       = 0x00000020,
 133         ICF_ATTACHED_TO_RQUEUE                  = 0x00000040,
 134         ICF_OOO_CMDSN                           = 0x00000080,
 135         IFC_SENDTARGETS_ALL                     = 0x00000100,
 136         IFC_SENDTARGETS_SINGLE                  = 0x00000200,
 137 };
 138
 139 /* struct iscsi_cmd->i_state */
 140 enum cmd_i_state_table {
 141         ISTATE_NO_STATE                 = 0,
 142         ISTATE_NEW_CMD                  = 1,
 143         ISTATE_DEFERRED_CMD             = 2,
 144         ISTATE_UNSOLICITED_DATA         = 3,
 145         ISTATE_RECEIVE_DATAOUT          = 4,
 146         ISTATE_RECEIVE_DATAOUT_RECOVERY = 5,
 147         ISTATE_RECEIVED_LAST_DATAOUT    = 6,
 148         ISTATE_WITHIN_DATAOUT_RECOVERY  = 7,
 149         ISTATE_IN_CONNECTION_RECOVERY   = 8,
 150         ISTATE_RECEIVED_TASKMGT         = 9,
 151         ISTATE_SEND_ASYNCMSG            = 10,
 152         ISTATE_SENT_ASYNCMSG            = 11,
 153         ISTATE_SEND_DATAIN              = 12,
 154         ISTATE_SEND_LAST_DATAIN         = 13,
 155         ISTATE_SENT_LAST_DATAIN         = 14,
 156         ISTATE_SEND_LOGOUTRSP           = 15,
 157         ISTATE_SENT_LOGOUTRSP           = 16,
 158         ISTATE_SEND_NOPIN               = 17,
 159         ISTATE_SENT_NOPIN               = 18,
 160         ISTATE_SEND_REJECT              = 19,
 161         ISTATE_SENT_REJECT              = 20,
 162         ISTATE_SEND_R2T                 = 21,
 163         ISTATE_SENT_R2T                 = 22,
 164         ISTATE_SEND_R2T_RECOVERY        = 23,
 165         ISTATE_SENT_R2T_RECOVERY        = 24,
 166         ISTATE_SEND_LAST_R2T            = 25,
 167         ISTATE_SENT_LAST_R2T            = 26,
 168         ISTATE_SEND_LAST_R2T_RECOVERY   = 27,
 169         ISTATE_SENT_LAST_R2T_RECOVERY   = 28,
 170         ISTATE_SEND_STATUS              = 29,
 171         ISTATE_SEND_STATUS_BROKEN_PC    = 30,
 172         ISTATE_SENT_STATUS              = 31,
 173         ISTATE_SEND_STATUS_RECOVERY     = 32,
 174         ISTATE_SENT_STATUS_RECOVERY     = 33,
 175         ISTATE_SEND_TASKMGTRSP          = 34,
 176         ISTATE_SENT_TASKMGTRSP          = 35,
 177         ISTATE_SEND_TEXTRSP             = 36,
 178         ISTATE_SENT_TEXTRSP             = 37,
 179         ISTATE_SEND_NOPIN_WANT_RESPONSE = 38,
 180         ISTATE_SENT_NOPIN_WANT_RESPONSE = 39,
 181         ISTATE_SEND_NOPIN_NO_RESPONSE   = 40,
 182         ISTATE_REMOVE                   = 41,
 183         ISTATE_FREE                     = 42,
 184 };
 185
 186 /* Used for iscsi_recover_cmdsn() return values */
 187 enum recover_cmdsn_ret_table {
 188         CMDSN_ERROR_CANNOT_RECOVER      = -1,
 189         CMDSN_NORMAL_OPERATION          = 0,
 190         CMDSN_LOWER_THAN_EXP            = 1,
 191         CMDSN_HIGHER_THAN_EXP           = 2,
 192 };
 193
 194 /* Used for iscsi_handle_immediate_data() return values */
 195 enum immedate_data_ret_table {
 196         IMMEDIATE_DATA_CANNOT_RECOVER   = -1,
 197         IMMEDIATE_DATA_NORMAL_OPERATION = 0,
 198         IMMEDIATE_DATA_ERL1_CRC_FAILURE = 1,
 199 };
 200
 201 /* Used for iscsi_decide_dataout_action() return values */
 202 enum dataout_action_ret_table {
 203         DATAOUT_CANNOT_RECOVER          = -1,
 204         DATAOUT_NORMAL                  = 0,
 205         DATAOUT_SEND_R2T                = 1,
 206         DATAOUT_SEND_TO_TRANSPORT       = 2,
 207         DATAOUT_WITHIN_COMMAND_RECOVERY = 3,
 208 };
 209
 210 /* Used for struct iscsi_node_auth->naf_flags */
 211 enum naf_flags_table {
 212         NAF_USERID_SET                  = 0x01,
 213         NAF_PASSWORD_SET                = 0x02,
 214         NAF_USERID_IN_SET               = 0x04,
 215         NAF_PASSWORD_IN_SET             = 0x08,
 216 };
 217
 218 /* Used by various struct timer_list to manage iSCSI specific state */
 219 enum iscsi_timer_flags_table {
 220         ISCSI_TF_RUNNING                = 0x01,
 221         ISCSI_TF_STOP                   = 0x02,
 222         ISCSI_TF_EXPIRED                = 0x04,
 223 };
 224
 225 /* Used for struct iscsi_np->np_flags */
 226 enum np_flags_table {
 227         NPF_IP_NETWORK          = 0x00,
 228 };
 229
 230 /* Used for struct iscsi_np->np_thread_state */
 231 enum np_thread_state_table {
 232         ISCSI_NP_THREAD_ACTIVE          = 1,
 233         ISCSI_NP_THREAD_INACTIVE        = 2,
 234         ISCSI_NP_THREAD_RESET           = 3,
 235         ISCSI_NP_THREAD_SHUTDOWN        = 4,
 236         ISCSI_NP_THREAD_EXIT            = 5,
 237 };
 238
 239 struct iscsi_conn_ops {
 240         u8      HeaderDigest;                   /* [0,1] == [None,CRC32C] */
 241         u8      DataDigest;                     /* [0,1] == [None,CRC32C] */
 242         u32     MaxRecvDataSegmentLength;       /* [512..2**24-1] */
 243         u32     MaxXmitDataSegmentLength;       /* [512..2**24-1] */
 244         u8      OFMarker;                       /* [0,1] == [No,Yes] */
 245         u8      IFMarker;                       /* [0,1] == [No,Yes] */
 246         u32     OFMarkInt;                      /* [1..65535] */
 247         u32     IFMarkInt;                      /* [1..65535] */
 248         /*
 249          * iSER specific connection parameters
 250          */
 251         u32     InitiatorRecvDataSegmentLength; /* [512..2**24-1] */
 252         u32     TargetRecvDataSegmentLength;    /* [512..2**24-1] */
 253 };
 254
 255 struct iscsi_sess_ops {
 256         char    InitiatorName[224];
 257         char    InitiatorAlias[256];
 258         char    TargetName[224];
 259         char    TargetAlias[256];
 260         char    TargetAddress[256];
 261         u16     TargetPortalGroupTag;           /* [0..65535] */
 262         u16     MaxConnections;                 /* [1..65535] */
 263         u8      InitialR2T;                     /* [0,1] == [No,Yes] */
 264         u8      ImmediateData;                  /* [0,1] == [No,Yes] */
 265         u32     MaxBurstLength;                 /* [512..2**24-1] */
 266         u32     FirstBurstLength;               /* [512..2**24-1] */
 267         u16     DefaultTime2Wait;               /* [0..3600] */
 268         u16     DefaultTime2Retain;             /* [0..3600] */
 269         u16     MaxOutstandingR2T;              /* [1..65535] */
 270         u8      DataPDUInOrder;                 /* [0,1] == [No,Yes] */
 271         u8      DataSequenceInOrder;            /* [0,1] == [No,Yes] */
 272         u8      ErrorRecoveryLevel;             /* [0..2] */
 273         u8      SessionType;                    /* [0,1] == [Normal,Discovery]*/
 274         /*
 275          * iSER specific session parameters
 276          */
 277         u8      RDMAExtensions;                 /* [0,1] == [No,Yes] */
 278 };
 279
 280 struct iscsi_queue_req {
 281         int                     state;
 282         struct iscsi_cmd        *cmd;
 283         struct list_head        qr_list;
 284 };
 285
 286 struct iscsi_data_count {
 287         int                     data_length;
 288         int                     sync_and_steering;
 289         enum data_count_type    type;
 290         u32                     iov_count;
 291         u32                     ss_iov_count;
 292         u32                     ss_marker_count;
 293         struct kvec             *iov;
 294 };
 295
 296 struct iscsi_param_list {
 297         bool                    iser;
 298         struct list_head        param_list;
 299         struct list_head        extra_response_list;
 300 };
 301
 302 struct iscsi_datain_req {
 303         enum datain_req_comp_table dr_complete;
 304         int                     generate_recovery_values;
 305         enum datain_req_rec_table recovery;
 306         u32                     begrun;
 307         u32                     runlength;
 308         u32                     data_length;
 309         u32                     data_offset;
 310         u32                     data_sn;
 311         u32                     next_burst_len;
 312         u32                     read_data_done;
 313         u32                     seq_send_order;
 314         struct list_head        cmd_datain_node;
 315 } ____cacheline_aligned;
 316
 317 struct iscsi_ooo_cmdsn {
 318         u16                     cid;
 319         u32                     batch_count;
 320         u32                     cmdsn;
 321         u32                     exp_cmdsn;
 322         struct iscsi_cmd        *cmd;
 323         struct list_head        ooo_list;
 324 } ____cacheline_aligned;
 325
 326 struct iscsi_datain {
 327         u8                      flags;
 328         u32                     data_sn;
 329         u32                     length;
 330         u32                     offset;
 331 } ____cacheline_aligned;
 332
 333 struct iscsi_r2t {
 334         int                     seq_complete;
 335         int                     recovery_r2t;
 336         int                     sent_r2t;
 337         u32                     r2t_sn;
 338         u32                     offset;
 339         u32                     targ_xfer_tag;
 340         u32                     xfer_len;
 341         struct list_head        r2t_list;
 342 } ____cacheline_aligned;
 343
 344 struct iscsi_cmd {
 345         enum iscsi_timer_flags_table dataout_timer_flags;
 346         /* DataOUT timeout retries */
 347         u8                      dataout_timeout_retries;
 348         /* Within command recovery count */
 349         u8                      error_recovery_count;
 350         /* iSCSI dependent state for out or order CmdSNs */
 351         enum cmd_i_state_table  deferred_i_state;
 352         /* iSCSI dependent state */
 353         enum cmd_i_state_table  i_state;
 354         /* Command is an immediate command (ISCSI_OP_IMMEDIATE set) */
 355         u8                      immediate_cmd;
 356         /* Immediate data present */
 357         u8                      immediate_data;
 358         /* iSCSI Opcode */
 359         u8                      iscsi_opcode;
 360         /* iSCSI Response Code */
 361         u8                      iscsi_response;
 362         /* Logout reason when iscsi_opcode == ISCSI_INIT_LOGOUT_CMND */
 363         u8                      logout_reason;
 364         /* Logout response code when iscsi_opcode == ISCSI_INIT_LOGOUT_CMND */
 365         u8                      logout_response;
 366         /* MaxCmdSN has been incremented */
 367         u8                      maxcmdsn_inc;
 368         /* Immediate Unsolicited Dataout */
 369         u8                      unsolicited_data;
 370         /* Reject reason code */
 371         u8                      reject_reason;
 372         /* CID contained in logout PDU when opcode == ISCSI_INIT_LOGOUT_CMND */
 373         u16                     logout_cid;
 374         /* Command flags */
 375         enum cmd_flags_table    cmd_flags;
 376         /* Initiator Task Tag assigned from Initiator */
 377         itt_t                   init_task_tag;
 378         /* Target Transfer Tag assigned from Target */
 379         u32                     targ_xfer_tag;
 380         /* CmdSN assigned from Initiator */
 381         u32                     cmd_sn;
 382         /* ExpStatSN assigned from Initiator */
 383         u32                     exp_stat_sn;
 384         /* StatSN assigned to this ITT */
 385         u32                     stat_sn;
 386         /* DataSN Counter */
 387         u32                     data_sn;
 388         /* R2TSN Counter */
 389         u32                     r2t_sn;
 390         /* Last DataSN acknowledged via DataAck SNACK */
 391         u32                     acked_data_sn;
 392         /* Used for echoing NOPOUT ping data */
 393         u32                     buf_ptr_size;
 394         /* Used to store DataDigest */
 395         u32                     data_crc;
 396         /* Counter for MaxOutstandingR2T */
 397         u32                     outstanding_r2ts;
 398         /* Next R2T Offset when DataSequenceInOrder=Yes */
 399         u32                     r2t_offset;
 400         /* Iovec current and orig count for iscsi_cmd->iov_data */
 401         u32                     iov_data_count;
 402         u32                     orig_iov_data_count;
 403         /* Number of miscellaneous iovecs used for IP stack calls */
 404         u32                     iov_misc_count;
 405         /* Number of struct iscsi_pdu in struct iscsi_cmd->pdu_list */
 406         u32                     pdu_count;
 407         /* Next struct iscsi_pdu to send in struct iscsi_cmd->pdu_list */
 408         u32                     pdu_send_order;
 409         /* Current struct iscsi_pdu in struct iscsi_cmd->pdu_list */
 410         u32                     pdu_start;
 411         /* Next struct iscsi_seq to send in struct iscsi_cmd->seq_list */
 412         u32                     seq_send_order;
 413         /* Number of struct iscsi_seq in struct iscsi_cmd->seq_list */
 414         u32                     seq_count;
 415         /* Current struct iscsi_seq in struct iscsi_cmd->seq_list */
 416         u32                     seq_no;
 417         /* Lowest offset in current DataOUT sequence */
 418         u32                     seq_start_offset;
 419         /* Highest offset in current DataOUT sequence */
 420         u32                     seq_end_offset;
 421         /* Total size in bytes received so far of READ data */
 422         u32                     read_data_done;
 423         /* Total size in bytes received so far of WRITE data */
 424         u32                     write_data_done;
 425         /* Counter for FirstBurstLength key */
 426         u32                     first_burst_len;
 427         /* Counter for MaxBurstLength key */
 428         u32                     next_burst_len;
 429         /* Transfer size used for IP stack calls */
 430         u32                     tx_size;
 431         /* Buffer used for various purposes */
 432         void                    *buf_ptr;
 433         /* Used by SendTargets=[iqn.,eui.] discovery */
 434         void                    *text_in_ptr;
 435         /* See include/linux/dma-mapping.h */
 436         enum dma_data_direction data_direction;
 437         /* iSCSI PDU Header + CRC */
 438         unsigned char           pdu[ISCSI_HDR_LEN + ISCSI_CRC_LEN];
 439         /* Number of times struct iscsi_cmd is present in immediate queue */
 440         atomic_t                immed_queue_count;
 441         atomic_t                response_queue_count;
 442         spinlock_t              datain_lock;
 443         spinlock_t              dataout_timeout_lock;
 444         /* spinlock for protecting struct iscsi_cmd->i_state */
 445         spinlock_t              istate_lock;
 446         /* spinlock for adding within command recovery entries */
 447         spinlock_t              error_lock;
 448         /* spinlock for adding R2Ts */
 449         spinlock_t              r2t_lock;
 450         /* DataIN List */
 451         struct list_head        datain_list;
 452         /* R2T List */
 453         struct list_head        cmd_r2t_list;
 454         /* Timer for DataOUT */
 455         struct timer_list       dataout_timer;
 456         /* Iovecs for SCSI data payload RX/TX w/ kernel level sockets */
 457         struct kvec             *iov_data;
 458         /* Iovecs for miscellaneous purposes */
 459 #define ISCSI_MISC_IOVECS                       5
 460         struct kvec             iov_misc[ISCSI_MISC_IOVECS];
 461         /* Array of struct iscsi_pdu used for DataPDUInOrder=No */
 462         struct iscsi_pdu        *pdu_list;
 463         /* Current struct iscsi_pdu used for DataPDUInOrder=No */
 464         struct iscsi_pdu        *pdu_ptr;
 465         /* Array of struct iscsi_seq used for DataSequenceInOrder=No */
 466         struct iscsi_seq        *seq_list;
 467         /* Current struct iscsi_seq used for DataSequenceInOrder=No */
 468         struct iscsi_seq        *seq_ptr;
 469         /* TMR Request when iscsi_opcode == ISCSI_OP_SCSI_TMFUNC */
 470         struct iscsi_tmr_req    *tmr_req;
 471         /* Connection this command is alligient to */
 472         struct iscsi_conn       *conn;
 473         /* Pointer to connection recovery entry */
 474         struct iscsi_conn_recovery *cr;
 475         /* Session the command is part of,  used for connection recovery */
 476         struct iscsi_session    *sess;
 477         /* list_head for connection list */
 478         struct list_head        i_conn_node;
 479         /* The TCM I/O descriptor that is accessed via container_of() */
 480         struct se_cmd           se_cmd;
 481         /* Sense buffer that will be mapped into outgoing status */
 482 #define ISCSI_SENSE_BUFFER_LEN          (TRANSPORT_SENSE_BUFFER + 2)
 483         unsigned char           sense_buffer[ISCSI_SENSE_BUFFER_LEN];
 484
 485         u32                     padding;
 486         u8                      pad_bytes[4];
 487
 488         struct scatterlist      *first_data_sg;
 489         u32                     first_data_sg_off;
 490         u32                     kmapped_nents;
 491         sense_reason_t          sense_reason;
 492         void (*release_cmd)(struct iscsi_cmd *);
 493 }  ____cacheline_aligned;
 494
 495 struct iscsi_tmr_req {
 496         bool                    task_reassign:1;
 497         u32                     exp_data_sn;
 498         struct iscsi_cmd        *ref_cmd;
 499         struct iscsi_conn_recovery *conn_recovery;
 500         struct se_tmr_req       *se_tmr_req;
 501 };
 502
 503 struct iscsi_conn {
 504         wait_queue_head_t       queues_wq;
 505         /* Authentication Successful for this connection */
 506         u8                      auth_complete;
 507         /* State connection is currently in */
 508         u8                      conn_state;
 509         u8                      conn_logout_reason;
 510         u8                      network_transport;
 511         enum iscsi_timer_flags_table nopin_timer_flags;
 512         enum iscsi_timer_flags_table nopin_response_timer_flags;
 513         /* Used to know what thread encountered a transport failure */
 514         u8                      which_thread;
 515         /* connection id assigned by the Initiator */
 516         u16                     cid;
 517         /* Remote TCP Port */
 518         u16                     login_port;
 519         u16                     local_port;
 520         int                     net_size;
 521         int                     login_family;
 522         u32                     auth_id;
 523         u32                     conn_flags;
 524         /* Used for iscsi_tx_login_rsp() */
 525         itt_t                   login_itt;
 526         u32                     exp_statsn;
 527         /* Per connection status sequence number */
 528         u32                     stat_sn;
 529         /* IFMarkInt's Current Value */
 530         u32                     if_marker;
 531         /* OFMarkInt's Current Value */
 532         u32                     of_marker;
 533         /* Used for calculating OFMarker offset to next PDU */
 534         u32                     of_marker_offset;
 535 #define IPV6_ADDRESS_SPACE                              48
 536         unsigned char           login_ip[IPV6_ADDRESS_SPACE];
 537         unsigned char           local_ip[IPV6_ADDRESS_SPACE];
 538         int                     conn_usage_count;
 539         int                     conn_waiting_on_uc;
 540         atomic_t                check_immediate_queue;
 541         atomic_t                conn_logout_remove;
 542         atomic_t                connection_exit;
 543         atomic_t                connection_recovery;
 544         atomic_t                connection_reinstatement;
 545         atomic_t                connection_wait_rcfr;
 546         atomic_t                sleep_on_conn_wait_comp;
 547         atomic_t                transport_failed;
 548         struct completion       conn_post_wait_comp;
 549         struct completion       conn_wait_comp;
 550         struct completion       conn_wait_rcfr_comp;
 551         struct completion       conn_waiting_on_uc_comp;
 552         struct completion       conn_logout_comp;
 553         struct completion       tx_half_close_comp;
 554         struct completion       rx_half_close_comp;
 555         /* socket used by this connection */
 556         struct socket           *sock;
 557         struct timer_list       nopin_timer;
 558         struct timer_list       nopin_response_timer;
 559         struct timer_list       transport_timer;
 560         /* Spinlock used for add/deleting cmd's from conn_cmd_list */
 561         spinlock_t              cmd_lock;
 562         spinlock_t              conn_usage_lock;
 563         spinlock_t              immed_queue_lock;
 564         spinlock_t              nopin_timer_lock;
 565         spinlock_t              response_queue_lock;
 566         spinlock_t              state_lock;
 567         /* libcrypto RX and TX contexts for crc32c */
 568         struct hash_desc        conn_rx_hash;
 569         struct hash_desc        conn_tx_hash;
 570         /* Used for scheduling TX and RX connection kthreads */
 571         cpumask_var_t           conn_cpumask;
 572         unsigned int            conn_rx_reset_cpumask:1;
 573         unsigned int            conn_tx_reset_cpumask:1;
 574         /* list_head of struct iscsi_cmd for this connection */
 575         struct list_head        conn_cmd_list;
 576         struct list_head        immed_queue_list;
 577         struct list_head        response_queue_list;
 578         struct iscsi_conn_ops   *conn_ops;
 579         struct iscsi_login      *conn_login;
 580         struct iscsit_transport *conn_transport;
 581         struct iscsi_param_list *param_list;
 582         /* Used for per connection auth state machine */
 583         void                    *auth_protocol;
 584         void                    *context;
 585         struct iscsi_login_thread_s *login_thread;
 586         struct iscsi_portal_group *tpg;
 587         /* Pointer to parent session */
 588         struct iscsi_session    *sess;
 589         /* Pointer to thread_set in use for this conn's threads */
 590         struct iscsi_thread_set *thread_set;
 591         /* list_head for session connection list */
 592         struct list_head        conn_list;
 593 } ____cacheline_aligned;
 594
 595 struct iscsi_conn_recovery {
 596         u16                     cid;
 597         u32                     cmd_count;
 598         u32                     maxrecvdatasegmentlength;
 599         u32                     maxxmitdatasegmentlength;
 600         int                     ready_for_reallegiance;
 601         struct list_head        conn_recovery_cmd_list;
 602         spinlock_t              conn_recovery_cmd_lock;
 603         struct timer_list       time2retain_timer;
 604         struct iscsi_session    *sess;
 605         struct list_head        cr_list;
 606 }  ____cacheline_aligned;
 607
 608 struct iscsi_session {
 609         u8                      initiator_vendor;
 610         u8                      isid[6];
 611         enum iscsi_timer_flags_table time2retain_timer_flags;
 612         u8                      version_active;
 613         u16                     cid_called;
 614         u16                     conn_recovery_count;
 615         u16                     tsih;
 616         /* state session is currently in */
 617         u32                     session_state;
 618         /* session wide counter: initiator assigned task tag */
 619         itt_t                   init_task_tag;
 620         /* session wide counter: target assigned task tag */
 621         u32                     targ_xfer_tag;
 622         u32                     cmdsn_window;
 623
 624         /* protects cmdsn values */
 625         struct mutex            cmdsn_mutex;
 626         /* session wide counter: expected command sequence number */
 627         u32                     exp_cmd_sn;
 628         /* session wide counter: maximum allowed command sequence number */
 629         u32                     max_cmd_sn;
 630         struct list_head        sess_ooo_cmdsn_list;
 631
 632         /* LIO specific session ID */
 633         u32                     sid;
 634         char                    auth_type[8];
 635         /* unique within the target */
 636         int                     session_index;
 637         /* Used for session reference counting */
 638         int                     session_usage_count;
 639         int                     session_waiting_on_uc;
 640         u32                     cmd_pdus;
 641         u32                     rsp_pdus;
 642         u64                     tx_data_octets;
 643         u64                     rx_data_octets;
 644         u32                     conn_digest_errors;
 645         u32                     conn_timeout_errors;
 646         u64                     creation_time;
 647         spinlock_t              session_stats_lock;
 648         /* Number of active connections */
 649         atomic_t                nconn;
 650         atomic_t                session_continuation;
 651         atomic_t                session_fall_back_to_erl0;
 652         atomic_t                session_logout;
 653         atomic_t                session_reinstatement;
 654         atomic_t                session_stop_active;
 655         atomic_t                sleep_on_sess_wait_comp;
 656         /* connection list */
 657         struct list_head        sess_conn_list;
 658         struct list_head        cr_active_list;
 659         struct list_head        cr_inactive_list;
 660         spinlock_t              conn_lock;
 661         spinlock_t              cr_a_lock;
 662         spinlock_t              cr_i_lock;
 663         spinlock_t              session_usage_lock;
 664         spinlock_t              ttt_lock;
 665         struct completion       async_msg_comp;
 666         struct completion       reinstatement_comp;
 667         struct completion       session_wait_comp;
 668         struct completion       session_waiting_on_uc_comp;
 669         struct timer_list       time2retain_timer;
 670         struct iscsi_sess_ops   *sess_ops;
 671         struct se_session       *se_sess;
 672         struct iscsi_portal_group *tpg;
 673 } ____cacheline_aligned;
 674
 675 struct iscsi_login {
 676         u8 auth_complete;
 677         u8 checked_for_existing;
 678         u8 current_stage;
 679         u8 leading_connection;
 680         u8 first_request;
 681         u8 version_min;
 682         u8 version_max;
 683         u8 login_complete;
 684         u8 login_failed;
 685         char isid[6];
 686         u32 cmd_sn;
 687         itt_t init_task_tag;
 688         u32 initial_exp_statsn;
 689         u32 rsp_length;
 690         u16 cid;
 691         u16 tsih;
 692         char req[ISCSI_HDR_LEN];
 693         char rsp[ISCSI_HDR_LEN];
 694         char *req_buf;
 695         char *rsp_buf;
 696         struct iscsi_conn *conn;
 697 } ____cacheline_aligned;
 698
 699 struct iscsi_node_attrib {
 700         u32                     dataout_timeout;
 701         u32                     dataout_timeout_retries;
 702         u32                     default_erl;
 703         u32                     nopin_timeout;
 704         u32                     nopin_response_timeout;
 705         u32                     random_datain_pdu_offsets;
 706         u32                     random_datain_seq_offsets;
 707         u32                     random_r2t_offsets;
 708         u32                     tmr_cold_reset;
 709         u32                     tmr_warm_reset;
 710         struct iscsi_node_acl *nacl;
 711 };
 712
 713 struct se_dev_entry_s;
 714
 715 struct iscsi_node_auth {
 716         enum naf_flags_table    naf_flags;
 717         int                     authenticate_target;
 718         /* Used for iscsit_global->discovery_auth,
 719          * set to zero (auth disabled) by default */
 720         int                     enforce_discovery_auth;
 721 #define MAX_USER_LEN                            256
 722 #define MAX_PASS_LEN                            256
 723         char                    userid[MAX_USER_LEN];
 724         char                    password[MAX_PASS_LEN];
 725         char                    userid_mutual[MAX_USER_LEN];
 726         char                    password_mutual[MAX_PASS_LEN];
 727 };
 728
 729 #include "iscsi_target_stat.h"
 730
 731 struct iscsi_node_stat_grps {
 732         struct config_group     iscsi_sess_stats_group;
 733         struct config_group     iscsi_conn_stats_group;
 734 };
 735
 736 struct iscsi_node_acl {
 737         struct iscsi_node_attrib node_attrib;
 738         struct iscsi_node_auth  node_auth;
 739         struct iscsi_node_stat_grps node_stat_grps;
 740         struct se_node_acl      se_node_acl;
 741 };
 742
 743 #define NODE_STAT_GRPS(nacl)    (&(nacl)->node_stat_grps)
 744
 745 #define ISCSI_NODE_ATTRIB(t)    (&(t)->node_attrib)
 746 #define ISCSI_NODE_AUTH(t)      (&(t)->node_auth)
 747
 748 struct iscsi_tpg_attrib {
 749         u32                     authentication;
 750         u32                     login_timeout;
 751         u32                     netif_timeout;
 752         u32                     generate_node_acls;
 753         u32                     cache_dynamic_acls;
 754         u32                     default_cmdsn_depth;
 755         u32                     demo_mode_write_protect;
 756         u32                     prod_mode_write_protect;
 757         struct iscsi_portal_group *tpg;
 758 };
 759
 760 struct iscsi_np {
 761         int                     np_network_transport;
 762         int                     np_ip_proto;
 763         int                     np_sock_type;
 764         enum np_thread_state_table np_thread_state;
 765         enum iscsi_timer_flags_table np_login_timer_flags;
 766         u32                     np_exports;
 767         enum np_flags_table     np_flags;
 768         unsigned char           np_ip[IPV6_ADDRESS_SPACE];
 769         u16                     np_port;
 770         spinlock_t              np_thread_lock;
 771         struct completion       np_restart_comp;
 772         struct socket           *np_socket;
 773         struct __kernel_sockaddr_storage np_sockaddr;
 774         struct task_struct      *np_thread;
 775         struct timer_list       np_login_timer;
 776         struct iscsi_portal_group *np_login_tpg;
 777         void                    *np_context;
 778         struct iscsit_transport *np_transport;
 779         struct list_head        np_list;
 780 } ____cacheline_aligned;
 781
 782 struct iscsi_tpg_np {
 783         struct iscsi_np         *tpg_np;
 784         struct iscsi_portal_group *tpg;
 785         struct iscsi_tpg_np     *tpg_np_parent;
 786         struct list_head        tpg_np_list;
 787         struct list_head        tpg_np_child_list;
 788         struct list_head        tpg_np_parent_list;
 789         struct se_tpg_np        se_tpg_np;
 790         spinlock_t              tpg_np_parent_lock;
 791 };
 792
 793 struct iscsi_portal_group {
 794         unsigned char           tpg_chap_id;
 795         /* TPG State */
 796         enum tpg_state_table    tpg_state;
 797         /* Target Portal Group Tag */
 798         u16                     tpgt;
 799         /* Id assigned to target sessions */
 800         u16                     ntsih;
 801         /* Number of active sessions */
 802         u32                     nsessions;
 803         /* Number of Network Portals available for this TPG */
 804         u32                     num_tpg_nps;
 805         /* Per TPG LIO specific session ID. */
 806         u32                     sid;
 807         /* Spinlock for adding/removing Network Portals */
 808         spinlock_t              tpg_np_lock;
 809         spinlock_t              tpg_state_lock;
 810         struct se_portal_group tpg_se_tpg;
 811         struct mutex            tpg_access_lock;
 812         struct mutex            np_login_lock;
 813         struct iscsi_tpg_attrib tpg_attrib;
 814         struct iscsi_node_auth  tpg_demo_auth;
 815         /* Pointer to default list of iSCSI parameters for TPG */
 816         struct iscsi_param_list *param_list;
 817         struct iscsi_tiqn       *tpg_tiqn;
 818         struct list_head        tpg_gnp_list;
 819         struct list_head        tpg_list;
 820 } ____cacheline_aligned;
 821
 822 #define ISCSI_TPG_C(c)          ((struct iscsi_portal_group *)(c)->tpg)
 823 #define ISCSI_TPG_LUN(c, l)  ((iscsi_tpg_list_t *)(c)->tpg->tpg_lun_list_t[l])
 824 #define ISCSI_TPG_S(s)          ((struct iscsi_portal_group *)(s)->tpg)
 825 #define ISCSI_TPG_ATTRIB(t)     (&(t)->tpg_attrib)
 826 #define SE_TPG(tpg)             (&(tpg)->tpg_se_tpg)
 827
 828 struct iscsi_wwn_stat_grps {
 829         struct config_group     iscsi_stat_group;
 830         struct config_group     iscsi_instance_group;
 831         struct config_group     iscsi_sess_err_group;
 832         struct config_group     iscsi_tgt_attr_group;
 833         struct config_group     iscsi_login_stats_group;
 834         struct config_group     iscsi_logout_stats_group;
 835 };
 836
 837 struct iscsi_tiqn {
 838 #define ISCSI_IQN_LEN                           224
 839         unsigned char           tiqn[ISCSI_IQN_LEN];
 840         enum tiqn_state_table   tiqn_state;
 841         int                     tiqn_access_count;
 842         u32                     tiqn_active_tpgs;
 843         u32                     tiqn_ntpgs;
 844         u32                     tiqn_num_tpg_nps;
 845         u32                     tiqn_nsessions;
 846         struct list_head        tiqn_list;
 847         struct list_head        tiqn_tpg_list;
 848         spinlock_t              tiqn_state_lock;
 849         spinlock_t              tiqn_tpg_lock;
 850         struct se_wwn           tiqn_wwn;
 851         struct iscsi_wwn_stat_grps tiqn_stat_grps;
 852         int                     tiqn_index;
 853         struct iscsi_sess_err_stats  sess_err_stats;
 854         struct iscsi_login_stats     login_stats;
 855         struct iscsi_logout_stats    logout_stats;
 856 } ____cacheline_aligned;
 857
 858 #define WWN_STAT_GRPS(tiqn)     (&(tiqn)->tiqn_stat_grps)
 859
 860 struct iscsit_global {
 861         /* In core shutdown */
 862         u32                     in_shutdown;
 863         u32                     active_ts;
 864         /* Unique identifier used for the authentication daemon */
 865         u32                     auth_id;
 866         u32                     inactive_ts;
 867         /* Thread Set bitmap count */
 868         int                     ts_bitmap_count;
 869         /* Thread Set bitmap pointer */
 870         unsigned long           *ts_bitmap;
 871         /* Used for iSCSI discovery session authentication */
 872         struct iscsi_node_acl   discovery_acl;
 873         struct iscsi_portal_group       *discovery_tpg;
 874 };
 875
 876 #endif /* ISCSI_TARGET_CORE_H */