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/iscsi_proto.h>
   9 #include <target/target_core_base.h>
  10
  11 #define ISCSIT_VERSION                  "v4.1.0"
  12 #define ISCSI_MAX_DATASN_MISSING_COUNT  16
  13 #define ISCSI_TX_THREAD_TCP_TIMEOUT     2
  14 #define ISCSI_RX_THREAD_TCP_TIMEOUT     2
  15 #define SECONDS_FOR_ASYNC_LOGOUT        10
  16 #define SECONDS_FOR_ASYNC_TEXT          10
  17 #define SECONDS_FOR_LOGOUT_COMP         15
  18 #define WHITE_SPACE                     " \t\v\f\n\r"
  19 #define ISCSIT_MIN_TAGS                 16
  20 #define ISCSIT_EXTRA_TAGS               8
  21 #define ISCSIT_TCP_BACKLOG              256
  22 #define ISCSI_RX_THREAD_NAME            "iscsi_trx"
  23 #define ISCSI_TX_THREAD_NAME            "iscsi_ttx"
  24
  25 /* struct iscsi_node_attrib sanity values */
  26 #define NA_DATAOUT_TIMEOUT              3
  27 #define NA_DATAOUT_TIMEOUT_MAX          60
  28 #define NA_DATAOUT_TIMEOUT_MIX          2
  29 #define NA_DATAOUT_TIMEOUT_RETRIES      5
  30 #define NA_DATAOUT_TIMEOUT_RETRIES_MAX  15
  31 #define NA_DATAOUT_TIMEOUT_RETRIES_MIN  1
  32 #define NA_NOPIN_TIMEOUT                15
  33 #define NA_NOPIN_TIMEOUT_MAX            60
  34 #define NA_NOPIN_TIMEOUT_MIN            3
  35 #define NA_NOPIN_RESPONSE_TIMEOUT       30
  36 #define NA_NOPIN_RESPONSE_TIMEOUT_MAX   60
  37 #define NA_NOPIN_RESPONSE_TIMEOUT_MIN   3
  38 #define NA_RANDOM_DATAIN_PDU_OFFSETS    0
  39 #define NA_RANDOM_DATAIN_SEQ_OFFSETS    0
  40 #define NA_RANDOM_R2T_OFFSETS           0
  41
  42 /* struct iscsi_tpg_attrib sanity values */
  43 #define TA_AUTHENTICATION               1
  44 #define TA_LOGIN_TIMEOUT                15
  45 #define TA_LOGIN_TIMEOUT_MAX            30
  46 #define TA_LOGIN_TIMEOUT_MIN            5
  47 #define TA_NETIF_TIMEOUT                2
  48 #define TA_NETIF_TIMEOUT_MAX            15
  49 #define TA_NETIF_TIMEOUT_MIN            2
  50 #define TA_GENERATE_NODE_ACLS           0
  51 #define TA_DEFAULT_CMDSN_DEPTH          64
  52 #define TA_DEFAULT_CMDSN_DEPTH_MAX      512
  53 #define TA_DEFAULT_CMDSN_DEPTH_MIN      1
  54 #define TA_CACHE_DYNAMIC_ACLS           0
  55 /* Enabled by default in demo mode (generic_node_acls=1) */
  56 #define TA_DEMO_MODE_WRITE_PROTECT      1
  57 /* Disabled by default in production mode w/ explict ACLs */
  58 #define TA_PROD_MODE_WRITE_PROTECT      0
  59 #define TA_DEMO_MODE_DISCOVERY          1
  60 #define TA_DEFAULT_ERL                  0
  61 #define TA_CACHE_CORE_NPS               0
  62 /* T10 protection information disabled by default */
  63 #define TA_DEFAULT_T10_PI               0
  64 #define TA_DEFAULT_FABRIC_PROT_TYPE     0
  65 /* TPG status needs to be enabled to return sendtargets discovery endpoint info */
  66 #define TA_DEFAULT_TPG_ENABLED_SENDTARGETS 1
  67
  68 #define ISCSI_IOV_DATA_BUFFER           5
  69
  70 enum iscsit_transport_type {
  71         ISCSI_TCP                               = 0,
  72         ISCSI_SCTP_TCP                          = 1,
  73         ISCSI_SCTP_UDP                          = 2,
  74         ISCSI_IWARP_TCP                         = 3,
  75         ISCSI_IWARP_SCTP                        = 4,
  76         ISCSI_INFINIBAND                        = 5,
  77 };
  78
  79 /* RFC-3720 7.1.4  Standard Connection State Diagram for a Target */
  80 enum target_conn_state_table {
  81         TARG_CONN_STATE_FREE                    = 0x1,
  82         TARG_CONN_STATE_XPT_UP                  = 0x3,
  83         TARG_CONN_STATE_IN_LOGIN                = 0x4,
  84         TARG_CONN_STATE_LOGGED_IN               = 0x5,
  85         TARG_CONN_STATE_IN_LOGOUT               = 0x6,
  86         TARG_CONN_STATE_LOGOUT_REQUESTED        = 0x7,
  87         TARG_CONN_STATE_CLEANUP_WAIT            = 0x8,
  88 };
  89
  90 /* RFC-3720 7.3.2  Session State Diagram for a Target */
  91 enum target_sess_state_table {
  92         TARG_SESS_STATE_FREE                    = 0x1,
  93         TARG_SESS_STATE_ACTIVE                  = 0x2,
  94         TARG_SESS_STATE_LOGGED_IN               = 0x3,
  95         TARG_SESS_STATE_FAILED                  = 0x4,
  96         TARG_SESS_STATE_IN_CONTINUE             = 0x5,
  97 };
  98
  99 /* struct iscsi_data_count->type */
 100 enum data_count_type {
 101         ISCSI_RX_DATA   = 1,
 102         ISCSI_TX_DATA   = 2,
 103 };
 104
 105 /* struct iscsi_datain_req->dr_complete */
 106 enum datain_req_comp_table {
 107         DATAIN_COMPLETE_NORMAL                  = 1,
 108         DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY = 2,
 109         DATAIN_COMPLETE_CONNECTION_RECOVERY     = 3,
 110 };
 111
 112 /* struct iscsi_datain_req->recovery */
 113 enum datain_req_rec_table {
 114         DATAIN_WITHIN_COMMAND_RECOVERY          = 1,
 115         DATAIN_CONNECTION_RECOVERY              = 2,
 116 };
 117
 118 /* struct iscsi_portal_group->state */
 119 enum tpg_state_table {
 120         TPG_STATE_FREE                          = 0,
 121         TPG_STATE_ACTIVE                        = 1,
 122         TPG_STATE_INACTIVE                      = 2,
 123         TPG_STATE_COLD_RESET                    = 3,
 124 };
 125
 126 /* struct iscsi_tiqn->tiqn_state */
 127 enum tiqn_state_table {
 128         TIQN_STATE_ACTIVE                       = 1,
 129         TIQN_STATE_SHUTDOWN                     = 2,
 130 };
 131
 132 /* struct iscsi_cmd->cmd_flags */
 133 enum cmd_flags_table {
 134         ICF_GOT_LAST_DATAOUT                    = 0x00000001,
 135         ICF_GOT_DATACK_SNACK                    = 0x00000002,
 136         ICF_NON_IMMEDIATE_UNSOLICITED_DATA      = 0x00000004,
 137         ICF_SENT_LAST_R2T                       = 0x00000008,
 138         ICF_WITHIN_COMMAND_RECOVERY             = 0x00000010,
 139         ICF_CONTIG_MEMORY                       = 0x00000020,
 140         ICF_ATTACHED_TO_RQUEUE                  = 0x00000040,
 141         ICF_OOO_CMDSN                           = 0x00000080,
 142         ICF_SENDTARGETS_ALL                     = 0x00000100,
 143         ICF_SENDTARGETS_SINGLE                  = 0x00000200,
 144 };
 145
 146 /* struct iscsi_cmd->i_state */
 147 enum cmd_i_state_table {
 148         ISTATE_NO_STATE                 = 0,
 149         ISTATE_NEW_CMD                  = 1,
 150         ISTATE_DEFERRED_CMD             = 2,
 151         ISTATE_UNSOLICITED_DATA         = 3,
 152         ISTATE_RECEIVE_DATAOUT          = 4,
 153         ISTATE_RECEIVE_DATAOUT_RECOVERY = 5,
 154         ISTATE_RECEIVED_LAST_DATAOUT    = 6,
 155         ISTATE_WITHIN_DATAOUT_RECOVERY  = 7,
 156         ISTATE_IN_CONNECTION_RECOVERY   = 8,
 157         ISTATE_RECEIVED_TASKMGT         = 9,
 158         ISTATE_SEND_ASYNCMSG            = 10,
 159         ISTATE_SENT_ASYNCMSG            = 11,
 160         ISTATE_SEND_DATAIN              = 12,
 161         ISTATE_SEND_LAST_DATAIN         = 13,
 162         ISTATE_SENT_LAST_DATAIN         = 14,
 163         ISTATE_SEND_LOGOUTRSP           = 15,
 164         ISTATE_SENT_LOGOUTRSP           = 16,
 165         ISTATE_SEND_NOPIN               = 17,
 166         ISTATE_SENT_NOPIN               = 18,
 167         ISTATE_SEND_REJECT              = 19,
 168         ISTATE_SENT_REJECT              = 20,
 169         ISTATE_SEND_R2T                 = 21,
 170         ISTATE_SENT_R2T                 = 22,
 171         ISTATE_SEND_R2T_RECOVERY        = 23,
 172         ISTATE_SENT_R2T_RECOVERY        = 24,
 173         ISTATE_SEND_LAST_R2T            = 25,
 174         ISTATE_SENT_LAST_R2T            = 26,
 175         ISTATE_SEND_LAST_R2T_RECOVERY   = 27,
 176         ISTATE_SENT_LAST_R2T_RECOVERY   = 28,
 177         ISTATE_SEND_STATUS              = 29,
 178         ISTATE_SEND_STATUS_BROKEN_PC    = 30,
 179         ISTATE_SENT_STATUS              = 31,
 180         ISTATE_SEND_STATUS_RECOVERY     = 32,
 181         ISTATE_SENT_STATUS_RECOVERY     = 33,
 182         ISTATE_SEND_TASKMGTRSP          = 34,
 183         ISTATE_SENT_TASKMGTRSP          = 35,
 184         ISTATE_SEND_TEXTRSP             = 36,
 185         ISTATE_SENT_TEXTRSP             = 37,
 186         ISTATE_SEND_NOPIN_WANT_RESPONSE = 38,
 187         ISTATE_SENT_NOPIN_WANT_RESPONSE = 39,
 188         ISTATE_SEND_NOPIN_NO_RESPONSE   = 40,
 189         ISTATE_REMOVE                   = 41,
 190         ISTATE_FREE                     = 42,
 191 };
 192
 193 /* Used for iscsi_recover_cmdsn() return values */
 194 enum recover_cmdsn_ret_table {
 195         CMDSN_ERROR_CANNOT_RECOVER      = -1,
 196         CMDSN_NORMAL_OPERATION          = 0,
 197         CMDSN_LOWER_THAN_EXP            = 1,
 198         CMDSN_HIGHER_THAN_EXP           = 2,
 199         CMDSN_MAXCMDSN_OVERRUN          = 3,
 200 };
 201
 202 /* Used for iscsi_handle_immediate_data() return values */
 203 enum immedate_data_ret_table {
 204         IMMEDIATE_DATA_CANNOT_RECOVER   = -1,
 205         IMMEDIATE_DATA_NORMAL_OPERATION = 0,
 206         IMMEDIATE_DATA_ERL1_CRC_FAILURE = 1,
 207 };
 208
 209 /* Used for iscsi_decide_dataout_action() return values */
 210 enum dataout_action_ret_table {
 211         DATAOUT_CANNOT_RECOVER          = -1,
 212         DATAOUT_NORMAL                  = 0,
 213         DATAOUT_SEND_R2T                = 1,
 214         DATAOUT_SEND_TO_TRANSPORT       = 2,
 215         DATAOUT_WITHIN_COMMAND_RECOVERY = 3,
 216 };
 217
 218 /* Used for struct iscsi_node_auth->naf_flags */
 219 enum naf_flags_table {
 220         NAF_USERID_SET                  = 0x01,
 221         NAF_PASSWORD_SET                = 0x02,
 222         NAF_USERID_IN_SET               = 0x04,
 223         NAF_PASSWORD_IN_SET             = 0x08,
 224 };
 225
 226 /* Used by various struct timer_list to manage iSCSI specific state */
 227 enum iscsi_timer_flags_table {
 228         ISCSI_TF_RUNNING                = 0x01,
 229         ISCSI_TF_STOP                   = 0x02,
 230         ISCSI_TF_EXPIRED                = 0x04,
 231 };
 232
 233 /* Used for struct iscsi_np->np_flags */
 234 enum np_flags_table {
 235         NPF_IP_NETWORK          = 0x00,
 236 };
 237
 238 /* Used for struct iscsi_np->np_thread_state */
 239 enum np_thread_state_table {
 240         ISCSI_NP_THREAD_ACTIVE          = 1,
 241         ISCSI_NP_THREAD_INACTIVE        = 2,
 242         ISCSI_NP_THREAD_RESET           = 3,
 243         ISCSI_NP_THREAD_SHUTDOWN        = 4,
 244         ISCSI_NP_THREAD_EXIT            = 5,
 245 };
 246
 247 struct iscsi_conn_ops {
 248         u8      HeaderDigest;                   /* [0,1] == [None,CRC32C] */
 249         u8      DataDigest;                     /* [0,1] == [None,CRC32C] */
 250         u32     MaxRecvDataSegmentLength;       /* [512..2**24-1] */
 251         u32     MaxXmitDataSegmentLength;       /* [512..2**24-1] */
 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         int                     net_size;
 523         int                     login_family;
 524         u32                     auth_id;
 525         u32                     conn_flags;
 526         /* Used for iscsi_tx_login_rsp() */
 527         itt_t                   login_itt;
 528         u32                     exp_statsn;
 529         /* Per connection status sequence number */
 530         u32                     stat_sn;
 531         struct sockaddr_storage login_sockaddr;
 532         struct sockaddr_storage local_sockaddr;
 533         int                     conn_usage_count;
 534         int                     conn_waiting_on_uc;
 535         atomic_t                check_immediate_queue;
 536         atomic_t                conn_logout_remove;
 537         atomic_t                connection_exit;
 538         atomic_t                connection_recovery;
 539         atomic_t                connection_reinstatement;
 540         atomic_t                connection_wait_rcfr;
 541         atomic_t                sleep_on_conn_wait_comp;
 542         atomic_t                transport_failed;
 543         struct completion       conn_post_wait_comp;
 544         struct completion       conn_wait_comp;
 545         struct completion       conn_wait_rcfr_comp;
 546         struct completion       conn_waiting_on_uc_comp;
 547         struct completion       conn_logout_comp;
 548         struct completion       tx_half_close_comp;
 549         struct completion       rx_half_close_comp;
 550         /* socket used by this connection */
 551         struct socket           *sock;
 552         void                    (*orig_data_ready)(struct sock *);
 553         void                    (*orig_state_change)(struct sock *);
 554 #define LOGIN_FLAGS_READ_ACTIVE         1
 555 #define LOGIN_FLAGS_CLOSED              2
 556 #define LOGIN_FLAGS_READY               4
 557         unsigned long           login_flags;
 558         struct delayed_work     login_work;
 559         struct delayed_work     login_cleanup_work;
 560         struct iscsi_login      *login;
 561         struct timer_list       nopin_timer;
 562         struct timer_list       nopin_response_timer;
 563         struct timer_list       transport_timer;
 564         struct task_struct      *login_kworker;
 565         /* Spinlock used for add/deleting cmd's from conn_cmd_list */
 566         spinlock_t              cmd_lock;
 567         spinlock_t              conn_usage_lock;
 568         spinlock_t              immed_queue_lock;
 569         spinlock_t              nopin_timer_lock;
 570         spinlock_t              response_queue_lock;
 571         spinlock_t              state_lock;
 572         /* libcrypto RX and TX contexts for crc32c */
 573         struct ahash_request    *conn_rx_hash;
 574         struct ahash_request    *conn_tx_hash;
 575         /* Used for scheduling TX and RX connection kthreads */
 576         cpumask_var_t           conn_cpumask;
 577         unsigned int            conn_rx_reset_cpumask:1;
 578         unsigned int            conn_tx_reset_cpumask:1;
 579         /* list_head of struct iscsi_cmd for this connection */
 580         struct list_head        conn_cmd_list;
 581         struct list_head        immed_queue_list;
 582         struct list_head        response_queue_list;
 583         struct iscsi_conn_ops   *conn_ops;
 584         struct iscsi_login      *conn_login;
 585         struct iscsit_transport *conn_transport;
 586         struct iscsi_param_list *param_list;
 587         /* Used for per connection auth state machine */
 588         void                    *auth_protocol;
 589         void                    *context;
 590         struct iscsi_login_thread_s *login_thread;
 591         struct iscsi_portal_group *tpg;
 592         struct iscsi_tpg_np     *tpg_np;
 593         /* Pointer to parent session */
 594         struct iscsi_session    *sess;
 595         int                     bitmap_id;
 596         int                     rx_thread_active;
 597         struct task_struct      *rx_thread;
 598         struct completion       rx_login_comp;
 599         int                     tx_thread_active;
 600         struct task_struct      *tx_thread;
 601         /* list_head for session connection list */
 602         struct list_head        conn_list;
 603 } ____cacheline_aligned;
 604
 605 struct iscsi_conn_recovery {
 606         u16                     cid;
 607         u32                     cmd_count;
 608         u32                     maxrecvdatasegmentlength;
 609         u32                     maxxmitdatasegmentlength;
 610         int                     ready_for_reallegiance;
 611         struct list_head        conn_recovery_cmd_list;
 612         spinlock_t              conn_recovery_cmd_lock;
 613         struct timer_list       time2retain_timer;
 614         struct iscsi_session    *sess;
 615         struct list_head        cr_list;
 616 }  ____cacheline_aligned;
 617
 618 struct iscsi_session {
 619         u8                      initiator_vendor;
 620         u8                      isid[6];
 621         enum iscsi_timer_flags_table time2retain_timer_flags;
 622         u8                      version_active;
 623         u16                     cid_called;
 624         u16                     conn_recovery_count;
 625         u16                     tsih;
 626         /* state session is currently in */
 627         u32                     session_state;
 628         /* session wide counter: initiator assigned task tag */
 629         itt_t                   init_task_tag;
 630         /* session wide counter: target assigned task tag */
 631         u32                     targ_xfer_tag;
 632         u32                     cmdsn_window;
 633
 634         /* protects cmdsn values */
 635         struct mutex            cmdsn_mutex;
 636         /* session wide counter: expected command sequence number */
 637         u32                     exp_cmd_sn;
 638         /* session wide counter: maximum allowed command sequence number */
 639         atomic_t                max_cmd_sn;
 640         struct list_head        sess_ooo_cmdsn_list;
 641
 642         /* LIO specific session ID */
 643         u32                     sid;
 644         char                    auth_type[8];
 645         /* unique within the target */
 646         int                     session_index;
 647         /* Used for session reference counting */
 648         int                     session_usage_count;
 649         int                     session_waiting_on_uc;
 650         atomic_long_t           cmd_pdus;
 651         atomic_long_t           rsp_pdus;
 652         atomic_long_t           tx_data_octets;
 653         atomic_long_t           rx_data_octets;
 654         atomic_long_t           conn_digest_errors;
 655         atomic_long_t           conn_timeout_errors;
 656         u64                     creation_time;
 657         /* Number of active connections */
 658         atomic_t                nconn;
 659         atomic_t                session_continuation;
 660         atomic_t                session_fall_back_to_erl0;
 661         atomic_t                session_logout;
 662         atomic_t                session_reinstatement;
 663         atomic_t                session_stop_active;
 664         atomic_t                sleep_on_sess_wait_comp;
 665         /* connection list */
 666         struct list_head        sess_conn_list;
 667         struct list_head        cr_active_list;
 668         struct list_head        cr_inactive_list;
 669         spinlock_t              conn_lock;
 670         spinlock_t              cr_a_lock;
 671         spinlock_t              cr_i_lock;
 672         spinlock_t              session_usage_lock;
 673         spinlock_t              ttt_lock;
 674         struct completion       async_msg_comp;
 675         struct completion       reinstatement_comp;
 676         struct completion       session_wait_comp;
 677         struct completion       session_waiting_on_uc_comp;
 678         struct timer_list       time2retain_timer;
 679         struct iscsi_sess_ops   *sess_ops;
 680         struct se_session       *se_sess;
 681         struct iscsi_portal_group *tpg;
 682 } ____cacheline_aligned;
 683
 684 struct iscsi_login {
 685         u8 auth_complete;
 686         u8 checked_for_existing;
 687         u8 current_stage;
 688         u8 leading_connection;
 689         u8 first_request;
 690         u8 version_min;
 691         u8 version_max;
 692         u8 login_complete;
 693         u8 login_failed;
 694         bool zero_tsih;
 695         char isid[6];
 696         u32 cmd_sn;
 697         itt_t init_task_tag;
 698         u32 initial_exp_statsn;
 699         u32 rsp_length;
 700         u16 cid;
 701         u16 tsih;
 702         char req[ISCSI_HDR_LEN];
 703         char rsp[ISCSI_HDR_LEN];
 704         char *req_buf;
 705         char *rsp_buf;
 706         struct iscsi_conn *conn;
 707         struct iscsi_np *np;
 708 } ____cacheline_aligned;
 709
 710 struct iscsi_node_attrib {
 711         u32                     dataout_timeout;
 712         u32                     dataout_timeout_retries;
 713         u32                     default_erl;
 714         u32                     nopin_timeout;
 715         u32                     nopin_response_timeout;
 716         u32                     random_datain_pdu_offsets;
 717         u32                     random_datain_seq_offsets;
 718         u32                     random_r2t_offsets;
 719         u32                     tmr_cold_reset;
 720         u32                     tmr_warm_reset;
 721         struct iscsi_node_acl *nacl;
 722 };
 723
 724 struct se_dev_entry_s;
 725
 726 struct iscsi_node_auth {
 727         enum naf_flags_table    naf_flags;
 728         int                     authenticate_target;
 729         /* Used for iscsit_global->discovery_auth,
 730          * set to zero (auth disabled) by default */
 731         int                     enforce_discovery_auth;
 732 #define MAX_USER_LEN                            256
 733 #define MAX_PASS_LEN                            256
 734         char                    userid[MAX_USER_LEN];
 735         char                    password[MAX_PASS_LEN];
 736         char                    userid_mutual[MAX_USER_LEN];
 737         char                    password_mutual[MAX_PASS_LEN];
 738 };
 739
 740 #include "iscsi_target_stat.h"
 741
 742 struct iscsi_node_stat_grps {
 743         struct config_group     iscsi_sess_stats_group;
 744         struct config_group     iscsi_conn_stats_group;
 745 };
 746
 747 struct iscsi_node_acl {
 748         struct se_node_acl      se_node_acl;
 749         struct iscsi_node_attrib node_attrib;
 750         struct iscsi_node_auth  node_auth;
 751         struct iscsi_node_stat_grps node_stat_grps;
 752 };
 753
 754 struct iscsi_tpg_attrib {
 755         u32                     authentication;
 756         u32                     login_timeout;
 757         u32                     netif_timeout;
 758         u32                     generate_node_acls;
 759         u32                     cache_dynamic_acls;
 760         u32                     default_cmdsn_depth;
 761         u32                     demo_mode_write_protect;
 762         u32                     prod_mode_write_protect;
 763         u32                     demo_mode_discovery;
 764         u32                     default_erl;
 765         u8                      t10_pi;
 766         u32                     fabric_prot_type;
 767         u32                     tpg_enabled_sendtargets;
 768         struct iscsi_portal_group *tpg;
 769 };
 770
 771 struct iscsi_np {
 772         int                     np_network_transport;
 773         int                     np_ip_proto;
 774         int                     np_sock_type;
 775         enum np_thread_state_table np_thread_state;
 776         bool                    enabled;
 777         enum iscsi_timer_flags_table np_login_timer_flags;
 778         u32                     np_exports;
 779         enum np_flags_table     np_flags;
 780         spinlock_t              np_thread_lock;
 781         struct completion       np_restart_comp;
 782         struct socket           *np_socket;
 783         struct sockaddr_storage np_sockaddr;
 784         struct task_struct      *np_thread;
 785         struct timer_list       np_login_timer;
 786         void                    *np_context;
 787         struct iscsit_transport *np_transport;
 788         struct list_head        np_list;
 789 } ____cacheline_aligned;
 790
 791 struct iscsi_tpg_np {
 792         struct iscsi_np         *tpg_np;
 793         struct iscsi_portal_group *tpg;
 794         struct iscsi_tpg_np     *tpg_np_parent;
 795         struct list_head        tpg_np_list;
 796         struct list_head        tpg_np_child_list;
 797         struct list_head        tpg_np_parent_list;
 798         struct se_tpg_np        se_tpg_np;
 799         spinlock_t              tpg_np_parent_lock;
 800         struct completion       tpg_np_comp;
 801         struct kref             tpg_np_kref;
 802 };
 803
 804 struct iscsi_portal_group {
 805         unsigned char           tpg_chap_id;
 806         /* TPG State */
 807         enum tpg_state_table    tpg_state;
 808         /* Target Portal Group Tag */
 809         u16                     tpgt;
 810         /* Id assigned to target sessions */
 811         u16                     ntsih;
 812         /* Number of active sessions */
 813         u32                     nsessions;
 814         /* Number of Network Portals available for this TPG */
 815         u32                     num_tpg_nps;
 816         /* Per TPG LIO specific session ID. */
 817         u32                     sid;
 818         /* Spinlock for adding/removing Network Portals */
 819         spinlock_t              tpg_np_lock;
 820         spinlock_t              tpg_state_lock;
 821         struct se_portal_group tpg_se_tpg;
 822         struct mutex            tpg_access_lock;
 823         struct semaphore        np_login_sem;
 824         struct iscsi_tpg_attrib tpg_attrib;
 825         struct iscsi_node_auth  tpg_demo_auth;
 826         /* Pointer to default list of iSCSI parameters for TPG */
 827         struct iscsi_param_list *param_list;
 828         struct iscsi_tiqn       *tpg_tiqn;
 829         struct list_head        tpg_gnp_list;
 830         struct list_head        tpg_list;
 831 } ____cacheline_aligned;
 832
 833 struct iscsi_wwn_stat_grps {
 834         struct config_group     iscsi_stat_group;
 835         struct config_group     iscsi_instance_group;
 836         struct config_group     iscsi_sess_err_group;
 837         struct config_group     iscsi_tgt_attr_group;
 838         struct config_group     iscsi_login_stats_group;
 839         struct config_group     iscsi_logout_stats_group;
 840 };
 841
 842 struct iscsi_tiqn {
 843 #define ISCSI_IQN_LEN                           224
 844         unsigned char           tiqn[ISCSI_IQN_LEN];
 845         enum tiqn_state_table   tiqn_state;
 846         int                     tiqn_access_count;
 847         u32                     tiqn_active_tpgs;
 848         u32                     tiqn_ntpgs;
 849         u32                     tiqn_num_tpg_nps;
 850         u32                     tiqn_nsessions;
 851         struct list_head        tiqn_list;
 852         struct list_head        tiqn_tpg_list;
 853         spinlock_t              tiqn_state_lock;
 854         spinlock_t              tiqn_tpg_lock;
 855         struct se_wwn           tiqn_wwn;
 856         struct iscsi_wwn_stat_grps tiqn_stat_grps;
 857         int                     tiqn_index;
 858         struct iscsi_sess_err_stats  sess_err_stats;
 859         struct iscsi_login_stats     login_stats;
 860         struct iscsi_logout_stats    logout_stats;
 861 } ____cacheline_aligned;
 862
 863 struct iscsit_global {
 864         /* In core shutdown */
 865         u32                     in_shutdown;
 866         u32                     active_ts;
 867         /* Unique identifier used for the authentication daemon */
 868         u32                     auth_id;
 869         u32                     inactive_ts;
 870 #define ISCSIT_BITMAP_BITS      262144
 871         /* Thread Set bitmap pointer */
 872         unsigned long           *ts_bitmap;
 873         spinlock_t              ts_bitmap_lock;
 874         /* Used for iSCSI discovery session authentication */
 875         struct iscsi_node_acl   discovery_acl;
 876         struct iscsi_portal_group       *discovery_tpg;
 877 };
 878
 879 static inline u32 session_get_next_ttt(struct iscsi_session *session)
 880 {
 881         u32 ttt;
 882
 883         spin_lock_bh(&session->ttt_lock);
 884         ttt = session->targ_xfer_tag++;
 885         if (ttt == 0xFFFFFFFF)
 886                 ttt = session->targ_xfer_tag++;
 887         spin_unlock_bh(&session->ttt_lock);
 888
 889         return ttt;
 890 }
 891
 892 extern struct iscsi_cmd *iscsit_find_cmd_from_itt(struct iscsi_conn *, itt_t);
 893 #endif /* ISCSI_TARGET_CORE_H */