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