include/target/iscsi/iscsi_target_core.h

   1 #ifndef ISCSI_TARGET_CORE_H
   2 #define ISCSI_TARGET_CORE_H
   3
   4 #include <linux/dma-direction.h>     /* enum dma_data_direction */
   5 #include <linux/list.h>              /* struct list_head */
   6 #include <linux/socket.h>            /* struct sockaddr_storage */
   7 #include <linux/types.h>             /* u8 */
   8 #include <scsi/iscsi_proto.h>        /* itt_t */
   9 #include <target/target_core_base.h> /* struct se_cmd */
  10
  11 struct sock;
  12
  13 #define ISCSIT_VERSION                  "v4.1.0"
  14 #define ISCSI_MAX_DATASN_MISSING_COUNT  16
  15 #define ISCSI_TX_THREAD_TCP_TIMEOUT     2
  16 #define ISCSI_RX_THREAD_TCP_TIMEOUT     2
  17 #define SECONDS_FOR_ASYNC_LOGOUT        10
  18 #define SECONDS_FOR_ASYNC_TEXT          10
  19 #define SECONDS_FOR_LOGOUT_COMP         15
  20 #define WHITE_SPACE                     " \t\v\f\n\r"
  21 #define ISCSIT_MIN_TAGS                 16
  22 #define ISCSIT_EXTRA_TAGS               8
  23 #define ISCSIT_TCP_BACKLOG              256
  24 #define ISCSI_RX_THREAD_NAME            "iscsi_trx"
  25 #define ISCSI_TX_THREAD_NAME            "iscsi_ttx"
  26
  27 /* struct iscsi_node_attrib sanity values */
  28 #define NA_DATAOUT_TIMEOUT              3
  29 #define NA_DATAOUT_TIMEOUT_MAX          60
  30 #define NA_DATAOUT_TIMEOUT_MIX          2
  31 #define NA_DATAOUT_TIMEOUT_RETRIES      5
  32 #define NA_DATAOUT_TIMEOUT_RETRIES_MAX  15
  33 #define NA_DATAOUT_TIMEOUT_RETRIES_MIN  1
  34 #define NA_NOPIN_TIMEOUT                15
  35 #define NA_NOPIN_TIMEOUT_MAX            60
  36 #define NA_NOPIN_TIMEOUT_MIN            3
  37 #define NA_NOPIN_RESPONSE_TIMEOUT       30
  38 #define NA_NOPIN_RESPONSE_TIMEOUT_MAX   60
  39 #define NA_NOPIN_RESPONSE_TIMEOUT_MIN   3
  40 #define NA_RANDOM_DATAIN_PDU_OFFSETS    0
  41 #define NA_RANDOM_DATAIN_SEQ_OFFSETS    0
  42 #define NA_RANDOM_R2T_OFFSETS           0
  43
  44 /* struct iscsi_tpg_attrib sanity values */
  45 #define TA_AUTHENTICATION               1
  46 #define TA_LOGIN_TIMEOUT                15
  47 #define TA_LOGIN_TIMEOUT_MAX            30
  48 #define TA_LOGIN_TIMEOUT_MIN            5
  49 #define TA_NETIF_TIMEOUT                2
  50 #define TA_NETIF_TIMEOUT_MAX            15
  51 #define TA_NETIF_TIMEOUT_MIN            2
  52 #define TA_GENERATE_NODE_ACLS           0
  53 #define TA_DEFAULT_CMDSN_DEPTH          64
  54 #define TA_DEFAULT_CMDSN_DEPTH_MAX      512
  55 #define TA_DEFAULT_CMDSN_DEPTH_MIN      1
  56 #define TA_CACHE_DYNAMIC_ACLS           0
  57 /* Enabled by default in demo mode (generic_node_acls=1) */
  58 #define TA_DEMO_MODE_WRITE_PROTECT      1
  59 /* Disabled by default in production mode w/ explict ACLs */
  60 #define TA_PROD_MODE_WRITE_PROTECT      0
  61 #define TA_DEMO_MODE_DISCOVERY          1
  62 #define TA_DEFAULT_ERL                  0
  63 #define TA_CACHE_CORE_NPS               0
  64 /* T10 protection information disabled by default */
  65 #define TA_DEFAULT_T10_PI               0
  66 #define TA_DEFAULT_FABRIC_PROT_TYPE     0
  67 /* TPG status needs to be enabled to return sendtargets discovery endpoint info */
  68 #define TA_DEFAULT_TPG_ENABLED_SENDTARGETS 1
  69 /*
  70  * Used to control the sending of keys with optional to respond state bit,
  71  * as a workaround for non RFC compliant initiators,that do not propose,
  72  * nor respond to specific keys required for login to complete.
  73  *
  74  * See iscsi_check_proposer_for_optional_reply() for more details.
  75  */
  76 #define TA_DEFAULT_LOGIN_KEYS_WORKAROUND 1
  77
  78 #define ISCSI_IOV_DATA_BUFFER           5
  79
  80 enum iscsit_transport_type {
  81         ISCSI_TCP                               = 0,
  82         ISCSI_SCTP_TCP                          = 1,
  83         ISCSI_SCTP_UDP                          = 2,
  84         ISCSI_IWARP_TCP                         = 3,
  85         ISCSI_IWARP_SCTP                        = 4,
  86         ISCSI_INFINIBAND                        = 5,
  87         ISCSI_CXGBIT                            = 6,
  88 };
  89
  90 /* RFC-3720 7.1.4  Standard Connection State Diagram for a Target */
  91 enum target_conn_state_table {
  92         TARG_CONN_STATE_FREE                    = 0x1,
  93         TARG_CONN_STATE_XPT_UP                  = 0x3,
  94         TARG_CONN_STATE_IN_LOGIN                = 0x4,
  95         TARG_CONN_STATE_LOGGED_IN               = 0x5,
  96         TARG_CONN_STATE_IN_LOGOUT               = 0x6,
  97         TARG_CONN_STATE_LOGOUT_REQUESTED        = 0x7,
  98         TARG_CONN_STATE_CLEANUP_WAIT            = 0x8,
  99 };
 100
 101 /* RFC-3720 7.3.2  Session State Diagram for a Target */
 102 enum target_sess_state_table {
 103         TARG_SESS_STATE_FREE                    = 0x1,
 104         TARG_SESS_STATE_ACTIVE                  = 0x2,
 105         TARG_SESS_STATE_LOGGED_IN               = 0x3,
 106         TARG_SESS_STATE_FAILED                  = 0x4,
 107         TARG_SESS_STATE_IN_CONTINUE             = 0x5,
 108 };
 109
 110 /* struct iscsi_data_count->type */
 111 enum data_count_type {
 112         ISCSI_RX_DATA   = 1,
 113         ISCSI_TX_DATA   = 2,
 114 };
 115
 116 /* struct iscsi_datain_req->dr_complete */
 117 enum datain_req_comp_table {
 118         DATAIN_COMPLETE_NORMAL                  = 1,
 119         DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY = 2,
 120         DATAIN_COMPLETE_CONNECTION_RECOVERY     = 3,
 121 };
 122
 123 /* struct iscsi_datain_req->recovery */
 124 enum datain_req_rec_table {
 125         DATAIN_WITHIN_COMMAND_RECOVERY          = 1,
 126         DATAIN_CONNECTION_RECOVERY              = 2,
 127 };
 128
 129 /* struct iscsi_portal_group->state */
 130 enum tpg_state_table {
 131         TPG_STATE_FREE                          = 0,
 132         TPG_STATE_ACTIVE                        = 1,
 133         TPG_STATE_INACTIVE                      = 2,
 134         TPG_STATE_COLD_RESET                    = 3,
 135 };
 136
 137 /* struct iscsi_tiqn->tiqn_state */
 138 enum tiqn_state_table {
 139         TIQN_STATE_ACTIVE                       = 1,
 140         TIQN_STATE_SHUTDOWN                     = 2,
 141 };
 142
 143 /* struct iscsi_cmd->cmd_flags */
 144 enum cmd_flags_table {
 145         ICF_GOT_LAST_DATAOUT                    = 0x00000001,
 146         ICF_GOT_DATACK_SNACK                    = 0x00000002,
 147         ICF_NON_IMMEDIATE_UNSOLICITED_DATA      = 0x00000004,
 148         ICF_SENT_LAST_R2T                       = 0x00000008,
 149         ICF_WITHIN_COMMAND_RECOVERY             = 0x00000010,
 150         ICF_CONTIG_MEMORY                       = 0x00000020,
 151         ICF_ATTACHED_TO_RQUEUE                  = 0x00000040,
 152         ICF_OOO_CMDSN                           = 0x00000080,
 153         ICF_SENDTARGETS_ALL                     = 0x00000100,
 154         ICF_SENDTARGETS_SINGLE                  = 0x00000200,
 155 };
 156
 157 /* struct iscsi_cmd->i_state */
 158 enum cmd_i_state_table {
 159         ISTATE_NO_STATE                 = 0,
 160         ISTATE_NEW_CMD                  = 1,
 161         ISTATE_DEFERRED_CMD             = 2,
 162         ISTATE_UNSOLICITED_DATA         = 3,
 163         ISTATE_RECEIVE_DATAOUT          = 4,
 164         ISTATE_RECEIVE_DATAOUT_RECOVERY = 5,
 165         ISTATE_RECEIVED_LAST_DATAOUT    = 6,
 166         ISTATE_WITHIN_DATAOUT_RECOVERY  = 7,
 167         ISTATE_IN_CONNECTION_RECOVERY   = 8,
 168         ISTATE_RECEIVED_TASKMGT         = 9,
 169         ISTATE_SEND_ASYNCMSG            = 10,
 170         ISTATE_SENT_ASYNCMSG            = 11,
 171         ISTATE_SEND_DATAIN              = 12,
 172         ISTATE_SEND_LAST_DATAIN         = 13,
 173         ISTATE_SENT_LAST_DATAIN         = 14,
 174         ISTATE_SEND_LOGOUTRSP           = 15,
 175         ISTATE_SENT_LOGOUTRSP           = 16,
 176         ISTATE_SEND_NOPIN               = 17,
 177         ISTATE_SENT_NOPIN               = 18,
 178         ISTATE_SEND_REJECT              = 19,
 179         ISTATE_SENT_REJECT              = 20,
 180         ISTATE_SEND_R2T                 = 21,
 181         ISTATE_SENT_R2T                 = 22,
 182         ISTATE_SEND_R2T_RECOVERY        = 23,
 183         ISTATE_SENT_R2T_RECOVERY        = 24,
 184         ISTATE_SEND_LAST_R2T            = 25,
 185         ISTATE_SENT_LAST_R2T            = 26,
 186         ISTATE_SEND_LAST_R2T_RECOVERY   = 27,
 187         ISTATE_SENT_LAST_R2T_RECOVERY   = 28,
 188         ISTATE_SEND_STATUS              = 29,
 189         ISTATE_SEND_STATUS_BROKEN_PC    = 30,
 190         ISTATE_SENT_STATUS              = 31,
 191         ISTATE_SEND_STATUS_RECOVERY     = 32,
 192         ISTATE_SENT_STATUS_RECOVERY     = 33,
 193         ISTATE_SEND_TASKMGTRSP          = 34,
 194         ISTATE_SENT_TASKMGTRSP          = 35,
 195         ISTATE_SEND_TEXTRSP             = 36,
 196         ISTATE_SENT_TEXTRSP             = 37,
 197         ISTATE_SEND_NOPIN_WANT_RESPONSE = 38,
 198         ISTATE_SENT_NOPIN_WANT_RESPONSE = 39,
 199         ISTATE_SEND_NOPIN_NO_RESPONSE   = 40,
 200         ISTATE_REMOVE                   = 41,
 201         ISTATE_FREE                     = 42,
 202 };
 203
 204 /* Used for iscsi_recover_cmdsn() return values */
 205 enum recover_cmdsn_ret_table {
 206         CMDSN_ERROR_CANNOT_RECOVER      = -1,
 207         CMDSN_NORMAL_OPERATION          = 0,
 208         CMDSN_LOWER_THAN_EXP            = 1,
 209         CMDSN_HIGHER_THAN_EXP           = 2,
 210         CMDSN_MAXCMDSN_OVERRUN          = 3,
 211 };
 212
 213 /* Used for iscsi_handle_immediate_data() return values */
 214 enum immedate_data_ret_table {
 215         IMMEDIATE_DATA_CANNOT_RECOVER   = -1,
 216         IMMEDIATE_DATA_NORMAL_OPERATION = 0,
 217         IMMEDIATE_DATA_ERL1_CRC_FAILURE = 1,
 218 };
 219
 220 /* Used for iscsi_decide_dataout_action() return values */
 221 enum dataout_action_ret_table {
 222         DATAOUT_CANNOT_RECOVER          = -1,
 223         DATAOUT_NORMAL                  = 0,
 224         DATAOUT_SEND_R2T                = 1,
 225         DATAOUT_SEND_TO_TRANSPORT       = 2,
 226         DATAOUT_WITHIN_COMMAND_RECOVERY = 3,
 227 };
 228
 229 /* Used for struct iscsi_node_auth->naf_flags */
 230 enum naf_flags_table {
 231         NAF_USERID_SET                  = 0x01,
 232         NAF_PASSWORD_SET                = 0x02,
 233         NAF_USERID_IN_SET               = 0x04,
 234         NAF_PASSWORD_IN_SET             = 0x08,
 235 };
 236
 237 /* Used by various struct timer_list to manage iSCSI specific state */
 238 enum iscsi_timer_flags_table {
 239         ISCSI_TF_RUNNING                = 0x01,
 240         ISCSI_TF_STOP                   = 0x02,
 241         ISCSI_TF_EXPIRED                = 0x04,
 242 };
 243
 244 /* Used for struct iscsi_np->np_flags */
 245 enum np_flags_table {
 246         NPF_IP_NETWORK          = 0x00,
 247 };
 248
 249 /* Used for struct iscsi_np->np_thread_state */
 250 enum np_thread_state_table {
 251         ISCSI_NP_THREAD_ACTIVE          = 1,
 252         ISCSI_NP_THREAD_INACTIVE        = 2,
 253         ISCSI_NP_THREAD_RESET           = 3,
 254         ISCSI_NP_THREAD_SHUTDOWN        = 4,
 255         ISCSI_NP_THREAD_EXIT            = 5,
 256 };
 257
 258 struct iscsi_conn_ops {
 259         u8      HeaderDigest;                   /* [0,1] == [None,CRC32C] */
 260         u8      DataDigest;                     /* [0,1] == [None,CRC32C] */
 261         u32     MaxRecvDataSegmentLength;       /* [512..2**24-1] */
 262         u32     MaxXmitDataSegmentLength;       /* [512..2**24-1] */
 263         /*
 264          * iSER specific connection parameters
 265          */
 266         u32     InitiatorRecvDataSegmentLength; /* [512..2**24-1] */
 267         u32     TargetRecvDataSegmentLength;    /* [512..2**24-1] */
 268 };
 269
 270 struct iscsi_sess_ops {
 271         char    InitiatorName[224];
 272         char    InitiatorAlias[256];
 273         char    TargetName[224];
 274         char    TargetAlias[256];
 275         char    TargetAddress[256];
 276         u16     TargetPortalGroupTag;           /* [0..65535] */
 277         u16     MaxConnections;                 /* [1..65535] */
 278         u8      InitialR2T;                     /* [0,1] == [No,Yes] */
 279         u8      ImmediateData;                  /* [0,1] == [No,Yes] */
 280         u32     MaxBurstLength;                 /* [512..2**24-1] */
 281         u32     FirstBurstLength;               /* [512..2**24-1] */
 282         u16     DefaultTime2Wait;               /* [0..3600] */
 283         u16     DefaultTime2Retain;             /* [0..3600] */
 284         u16     MaxOutstandingR2T;              /* [1..65535] */
 285         u8      DataPDUInOrder;                 /* [0,1] == [No,Yes] */
 286         u8      DataSequenceInOrder;            /* [0,1] == [No,Yes] */
 287         u8      ErrorRecoveryLevel;             /* [0..2] */
 288         u8      SessionType;                    /* [0,1] == [Normal,Discovery]*/
 289         /*
 290          * iSER specific session parameters
 291          */
 292         u8      RDMAExtensions;                 /* [0,1] == [No,Yes] */
 293 };
 294
 295 struct iscsi_queue_req {
 296         int                     state;
 297         struct iscsi_cmd        *cmd;
 298         struct list_head        qr_list;
 299 };
 300
 301 struct iscsi_data_count {
 302         int                     data_length;
 303         int                     sync_and_steering;
 304         enum data_count_type    type;
 305         u32                     iov_count;
 306         u32                     ss_iov_count;
 307         u32                     ss_marker_count;
 308         struct kvec             *iov;
 309 };
 310
 311 struct iscsi_param_list {
 312         bool                    iser;
 313         struct list_head        param_list;
 314         struct list_head        extra_response_list;
 315 };
 316
 317 struct iscsi_datain_req {
 318         enum datain_req_comp_table dr_complete;
 319         int                     generate_recovery_values;
 320         enum datain_req_rec_table recovery;
 321         u32                     begrun;
 322         u32                     runlength;
 323         u32                     data_length;
 324         u32                     data_offset;
 325         u32                     data_sn;
 326         u32                     next_burst_len;
 327         u32                     read_data_done;
 328         u32                     seq_send_order;
 329         struct list_head        cmd_datain_node;
 330 } ____cacheline_aligned;
 331
 332 struct iscsi_ooo_cmdsn {
 333         u16                     cid;
 334         u32                     batch_count;
 335         u32                     cmdsn;
 336         u32                     exp_cmdsn;
 337         struct iscsi_cmd        *cmd;
 338         struct list_head        ooo_list;
 339 } ____cacheline_aligned;
 340
 341 struct iscsi_datain {
 342         u8                      flags;
 343         u32                     data_sn;
 344         u32                     length;
 345         u32                     offset;
 346 } ____cacheline_aligned;
 347
 348 struct iscsi_r2t {
 349         int                     seq_complete;
 350         int                     recovery_r2t;
 351         int                     sent_r2t;
 352         u32                     r2t_sn;
 353         u32                     offset;
 354         u32                     targ_xfer_tag;
 355         u32                     xfer_len;
 356         struct list_head        r2t_list;
 357 } ____cacheline_aligned;
 358
 359 struct iscsi_cmd {
 360         enum iscsi_timer_flags_table dataout_timer_flags;
 361         /* DataOUT timeout retries */
 362         u8                      dataout_timeout_retries;
 363         /* Within command recovery count */
 364         u8                      error_recovery_count;
 365         /* iSCSI dependent state for out or order CmdSNs */
 366         enum cmd_i_state_table  deferred_i_state;
 367         /* iSCSI dependent state */
 368         enum cmd_i_state_table  i_state;
 369         /* Command is an immediate command (ISCSI_OP_IMMEDIATE set) */
 370         u8                      immediate_cmd;
 371         /* Immediate data present */
 372         u8                      immediate_data;
 373         /* iSCSI Opcode */
 374         u8                      iscsi_opcode;
 375         /* iSCSI Response Code */
 376         u8                      iscsi_response;
 377         /* Logout reason when iscsi_opcode == ISCSI_INIT_LOGOUT_CMND */
 378         u8                      logout_reason;
 379         /* Logout response code when iscsi_opcode == ISCSI_INIT_LOGOUT_CMND */
 380         u8                      logout_response;
 381         /* MaxCmdSN has been incremented */
 382         u8                      maxcmdsn_inc;
 383         /* Immediate Unsolicited Dataout */
 384         u8                      unsolicited_data;
 385         /* Reject reason code */
 386         u8                      reject_reason;
 387         /* CID contained in logout PDU when opcode == ISCSI_INIT_LOGOUT_CMND */
 388         u16                     logout_cid;
 389         /* Command flags */
 390         enum cmd_flags_table    cmd_flags;
 391         /* Initiator Task Tag assigned from Initiator */
 392         itt_t                   init_task_tag;
 393         /* Target Transfer Tag assigned from Target */
 394         u32                     targ_xfer_tag;
 395         /* CmdSN assigned from Initiator */
 396         u32                     cmd_sn;
 397         /* ExpStatSN assigned from Initiator */
 398         u32                     exp_stat_sn;
 399         /* StatSN assigned to this ITT */
 400         u32                     stat_sn;
 401         /* DataSN Counter */
 402         u32                     data_sn;
 403         /* R2TSN Counter */
 404         u32                     r2t_sn;
 405         /* Last DataSN acknowledged via DataAck SNACK */
 406         u32                     acked_data_sn;
 407         /* Used for echoing NOPOUT ping data */
 408         u32                     buf_ptr_size;
 409         /* Used to store DataDigest */
 410         u32                     data_crc;
 411         /* Counter for MaxOutstandingR2T */
 412         u32                     outstanding_r2ts;
 413         /* Next R2T Offset when DataSequenceInOrder=Yes */
 414         u32                     r2t_offset;
 415         /* Iovec current and orig count for iscsi_cmd->iov_data */
 416         u32                     iov_data_count;
 417         u32                     orig_iov_data_count;
 418         /* Number of miscellaneous iovecs used for IP stack calls */
 419         u32                     iov_misc_count;
 420         /* Number of struct iscsi_pdu in struct iscsi_cmd->pdu_list */
 421         u32                     pdu_count;
 422         /* Next struct iscsi_pdu to send in struct iscsi_cmd->pdu_list */
 423         u32                     pdu_send_order;
 424         /* Current struct iscsi_pdu in struct iscsi_cmd->pdu_list */
 425         u32                     pdu_start;
 426         /* Next struct iscsi_seq to send in struct iscsi_cmd->seq_list */
 427         u32                     seq_send_order;
 428         /* Number of struct iscsi_seq in struct iscsi_cmd->seq_list */
 429         u32                     seq_count;
 430         /* Current struct iscsi_seq in struct iscsi_cmd->seq_list */
 431         u32                     seq_no;
 432         /* Lowest offset in current DataOUT sequence */
 433         u32                     seq_start_offset;
 434         /* Highest offset in current DataOUT sequence */
 435         u32                     seq_end_offset;
 436         /* Total size in bytes received so far of READ data */
 437         u32                     read_data_done;
 438         /* Total size in bytes received so far of WRITE data */
 439         u32                     write_data_done;
 440         /* Counter for FirstBurstLength key */
 441         u32                     first_burst_len;
 442         /* Counter for MaxBurstLength key */
 443         u32                     next_burst_len;
 444         /* Transfer size used for IP stack calls */
 445         u32                     tx_size;
 446         /* Buffer used for various purposes */
 447         void                    *buf_ptr;
 448         /* Used by SendTargets=[iqn.,eui.] discovery */
 449         void                    *text_in_ptr;
 450         /* See include/linux/dma-mapping.h */
 451         enum dma_data_direction data_direction;
 452         /* iSCSI PDU Header + CRC */
 453         unsigned char           pdu[ISCSI_HDR_LEN + ISCSI_CRC_LEN];
 454         /* Number of times struct iscsi_cmd is present in immediate queue */
 455         atomic_t                immed_queue_count;
 456         atomic_t                response_queue_count;
 457         spinlock_t              datain_lock;
 458         spinlock_t              dataout_timeout_lock;
 459         /* spinlock for protecting struct iscsi_cmd->i_state */
 460         spinlock_t              istate_lock;
 461         /* spinlock for adding within command recovery entries */
 462         spinlock_t              error_lock;
 463         /* spinlock for adding R2Ts */
 464         spinlock_t              r2t_lock;
 465         /* DataIN List */
 466         struct list_head        datain_list;
 467         /* R2T List */
 468         struct list_head        cmd_r2t_list;
 469         /* Timer for DataOUT */
 470         struct timer_list       dataout_timer;
 471         /* Iovecs for SCSI data payload RX/TX w/ kernel level sockets */
 472         struct kvec             *iov_data;
 473         /* Iovecs for miscellaneous purposes */
 474 #define ISCSI_MISC_IOVECS                       5
 475         struct kvec             iov_misc[ISCSI_MISC_IOVECS];
 476         /* Array of struct iscsi_pdu used for DataPDUInOrder=No */
 477         struct iscsi_pdu        *pdu_list;
 478         /* Current struct iscsi_pdu used for DataPDUInOrder=No */
 479         struct iscsi_pdu        *pdu_ptr;
 480         /* Array of struct iscsi_seq used for DataSequenceInOrder=No */
 481         struct iscsi_seq        *seq_list;
 482         /* Current struct iscsi_seq used for DataSequenceInOrder=No */
 483         struct iscsi_seq        *seq_ptr;
 484         /* TMR Request when iscsi_opcode == ISCSI_OP_SCSI_TMFUNC */
 485         struct iscsi_tmr_req    *tmr_req;
 486         /* Connection this command is alligient to */
 487         struct iscsi_conn       *conn;
 488         /* Pointer to connection recovery entry */
 489         struct iscsi_conn_recovery *cr;
 490         /* Session the command is part of,  used for connection recovery */
 491         struct iscsi_session    *sess;
 492         /* list_head for connection list */
 493         struct list_head        i_conn_node;
 494         /* The TCM I/O descriptor that is accessed via container_of() */
 495         struct se_cmd           se_cmd;
 496         /* Sense buffer that will be mapped into outgoing status */
 497 #define ISCSI_SENSE_BUFFER_LEN          (TRANSPORT_SENSE_BUFFER + 2)
 498         unsigned char           sense_buffer[ISCSI_SENSE_BUFFER_LEN];
 499
 500         u32                     padding;
 501         u8                      pad_bytes[4];
 502
 503         struct scatterlist      *first_data_sg;
 504         u32                     first_data_sg_off;
 505         u32                     kmapped_nents;
 506         sense_reason_t          sense_reason;
 507 }  ____cacheline_aligned;
 508
 509 struct iscsi_tmr_req {
 510         bool                    task_reassign:1;
 511         u32                     exp_data_sn;
 512         struct iscsi_cmd        *ref_cmd;
 513         struct iscsi_conn_recovery *conn_recovery;
 514         struct se_tmr_req       *se_tmr_req;
 515 };
 516
 517 struct iscsi_conn {
 518         wait_queue_head_t       queues_wq;
 519         /* Authentication Successful for this connection */
 520         u8                      auth_complete;
 521         /* State connection is currently in */
 522         u8                      conn_state;
 523         u8                      conn_logout_reason;
 524         u8                      network_transport;
 525         enum iscsi_timer_flags_table nopin_timer_flags;
 526         enum iscsi_timer_flags_table nopin_response_timer_flags;
 527         /* Used to know what thread encountered a transport failure */
 528         u8                      which_thread;
 529         /* connection id assigned by the Initiator */
 530         u16                     cid;
 531         /* Remote TCP Port */
 532         u16                     login_port;
 533         int                     net_size;
 534         int                     login_family;
 535         u32                     auth_id;
 536         u32                     conn_flags;
 537         /* Used for iscsi_tx_login_rsp() */
 538         itt_t                   login_itt;
 539         u32                     exp_statsn;
 540         /* Per connection status sequence number */
 541         u32                     stat_sn;
 542         struct sockaddr_storage login_sockaddr;
 543         struct sockaddr_storage local_sockaddr;
 544         int                     conn_usage_count;
 545         int                     conn_waiting_on_uc;
 546         atomic_t                check_immediate_queue;
 547         atomic_t                conn_logout_remove;
 548         atomic_t                connection_exit;
 549         atomic_t                connection_recovery;
 550         atomic_t                connection_reinstatement;
 551         atomic_t                connection_wait_rcfr;
 552         atomic_t                sleep_on_conn_wait_comp;
 553         atomic_t                transport_failed;
 554         struct completion       conn_post_wait_comp;
 555         struct completion       conn_wait_comp;
 556         struct completion       conn_wait_rcfr_comp;
 557         struct completion       conn_waiting_on_uc_comp;
 558         struct completion       conn_logout_comp;
 559         struct completion       tx_half_close_comp;
 560         struct completion       rx_half_close_comp;
 561         /* socket used by this connection */
 562         struct socket           *sock;
 563         void                    (*orig_data_ready)(struct sock *);
 564         void                    (*orig_state_change)(struct sock *);
 565 #define LOGIN_FLAGS_READ_ACTIVE         1
 566 #define LOGIN_FLAGS_CLOSED              2
 567 #define LOGIN_FLAGS_READY               4
 568 #define LOGIN_FLAGS_INITIAL_PDU         8
 569         unsigned long           login_flags;
 570         struct delayed_work     login_work;
 571         struct iscsi_login      *login;
 572         struct timer_list       nopin_timer;
 573         struct timer_list       nopin_response_timer;
 574         struct timer_list       transport_timer;
 575         struct task_struct      *login_kworker;
 576         /* Spinlock used for add/deleting cmd's from conn_cmd_list */
 577         spinlock_t              cmd_lock;
 578         spinlock_t              conn_usage_lock;
 579         spinlock_t              immed_queue_lock;
 580         spinlock_t              nopin_timer_lock;
 581         spinlock_t              response_queue_lock;
 582         spinlock_t              state_lock;
 583         /* libcrypto RX and TX contexts for crc32c */
 584         struct ahash_request    *conn_rx_hash;
 585         struct ahash_request    *conn_tx_hash;
 586         /* Used for scheduling TX and RX connection kthreads */
 587         cpumask_var_t           conn_cpumask;
 588         unsigned int            conn_rx_reset_cpumask:1;
 589         unsigned int            conn_tx_reset_cpumask:1;
 590         /* list_head of struct iscsi_cmd for this connection */
 591         struct list_head        conn_cmd_list;
 592         struct list_head        immed_queue_list;
 593         struct list_head        response_queue_list;
 594         struct iscsi_conn_ops   *conn_ops;
 595         struct iscsi_login      *conn_login;
 596         struct iscsit_transport *conn_transport;
 597         struct iscsi_param_list *param_list;
 598         /* Used for per connection auth state machine */
 599         void                    *auth_protocol;
 600         void                    *context;
 601         struct iscsi_login_thread_s *login_thread;
 602         struct iscsi_portal_group *tpg;
 603         struct iscsi_tpg_np     *tpg_np;
 604         /* Pointer to parent session */
 605         struct iscsi_session    *sess;
 606         int                     bitmap_id;
 607         int                     rx_thread_active;
 608         struct task_struct      *rx_thread;
 609         struct completion       rx_login_comp;
 610         int                     tx_thread_active;
 611         struct task_struct      *tx_thread;
 612         /* list_head for session connection list */
 613         struct list_head        conn_list;
 614 } ____cacheline_aligned;
 615
 616 struct iscsi_conn_recovery {
 617         u16                     cid;
 618         u32                     cmd_count;
 619         u32                     maxrecvdatasegmentlength;
 620         u32                     maxxmitdatasegmentlength;
 621         int                     ready_for_reallegiance;
 622         struct list_head        conn_recovery_cmd_list;
 623         spinlock_t              conn_recovery_cmd_lock;
 624         struct timer_list       time2retain_timer;
 625         struct iscsi_session    *sess;
 626         struct list_head        cr_list;
 627 }  ____cacheline_aligned;
 628
 629 struct iscsi_session {
 630         u8                      initiator_vendor;
 631         u8                      isid[6];
 632         enum iscsi_timer_flags_table time2retain_timer_flags;
 633         u8                      version_active;
 634         u16                     cid_called;
 635         u16                     conn_recovery_count;
 636         u16                     tsih;
 637         /* state session is currently in */
 638         u32                     session_state;
 639         /* session wide counter: initiator assigned task tag */
 640         itt_t                   init_task_tag;
 641         /* session wide counter: target assigned task tag */
 642         u32                     targ_xfer_tag;
 643         u32                     cmdsn_window;
 644
 645         /* protects cmdsn values */
 646         struct mutex            cmdsn_mutex;
 647         /* session wide counter: expected command sequence number */
 648         u32                     exp_cmd_sn;
 649         /* session wide counter: maximum allowed command sequence number */
 650         atomic_t                max_cmd_sn;
 651         struct list_head        sess_ooo_cmdsn_list;
 652
 653         /* LIO specific session ID */
 654         u32                     sid;
 655         char                    auth_type[8];
 656         /* unique within the target */
 657         int                     session_index;
 658         /* Used for session reference counting */
 659         int                     session_usage_count;
 660         int                     session_waiting_on_uc;
 661         atomic_long_t           cmd_pdus;
 662         atomic_long_t           rsp_pdus;
 663         atomic_long_t           tx_data_octets;
 664         atomic_long_t           rx_data_octets;
 665         atomic_long_t           conn_digest_errors;
 666         atomic_long_t           conn_timeout_errors;
 667         u64                     creation_time;
 668         /* Number of active connections */
 669         atomic_t                nconn;
 670         atomic_t                session_continuation;
 671         atomic_t                session_fall_back_to_erl0;
 672         atomic_t                session_logout;
 673         atomic_t                session_reinstatement;
 674         atomic_t                session_stop_active;
 675         atomic_t                sleep_on_sess_wait_comp;
 676         /* connection list */
 677         struct list_head        sess_conn_list;
 678         struct list_head        cr_active_list;
 679         struct list_head        cr_inactive_list;
 680         spinlock_t              conn_lock;
 681         spinlock_t              cr_a_lock;
 682         spinlock_t              cr_i_lock;
 683         spinlock_t              session_usage_lock;
 684         spinlock_t              ttt_lock;
 685         struct completion       async_msg_comp;
 686         struct completion       reinstatement_comp;
 687         struct completion       session_wait_comp;
 688         struct completion       session_waiting_on_uc_comp;
 689         struct timer_list       time2retain_timer;
 690         struct iscsi_sess_ops   *sess_ops;
 691         struct se_session       *se_sess;
 692         struct iscsi_portal_group *tpg;
 693 } ____cacheline_aligned;
 694
 695 struct iscsi_login {
 696         u8 auth_complete;
 697         u8 checked_for_existing;
 698         u8 current_stage;
 699         u8 leading_connection;
 700         u8 first_request;
 701         u8 version_min;
 702         u8 version_max;
 703         u8 login_complete;
 704         u8 login_failed;
 705         bool zero_tsih;
 706         char isid[6];
 707         u32 cmd_sn;
 708         itt_t init_task_tag;
 709         u32 initial_exp_statsn;
 710         u32 rsp_length;
 711         u16 cid;
 712         u16 tsih;
 713         char req[ISCSI_HDR_LEN];
 714         char rsp[ISCSI_HDR_LEN];
 715         char *req_buf;
 716         char *rsp_buf;
 717         struct iscsi_conn *conn;
 718         struct iscsi_np *np;
 719 } ____cacheline_aligned;
 720
 721 struct iscsi_node_attrib {
 722         u32                     dataout_timeout;
 723         u32                     dataout_timeout_retries;
 724         u32                     default_erl;
 725         u32                     nopin_timeout;
 726         u32                     nopin_response_timeout;
 727         u32                     random_datain_pdu_offsets;
 728         u32                     random_datain_seq_offsets;
 729         u32                     random_r2t_offsets;
 730         u32                     tmr_cold_reset;
 731         u32                     tmr_warm_reset;
 732         struct iscsi_node_acl *nacl;
 733 };
 734
 735 struct se_dev_entry_s;
 736
 737 struct iscsi_node_auth {
 738         enum naf_flags_table    naf_flags;
 739         int                     authenticate_target;
 740         /* Used for iscsit_global->discovery_auth,
 741          * set to zero (auth disabled) by default */
 742         int                     enforce_discovery_auth;
 743 #define MAX_USER_LEN                            256
 744 #define MAX_PASS_LEN                            256
 745         char                    userid[MAX_USER_LEN];
 746         char                    password[MAX_PASS_LEN];
 747         char                    userid_mutual[MAX_USER_LEN];
 748         char                    password_mutual[MAX_PASS_LEN];
 749 };
 750
 751 #include "iscsi_target_stat.h"
 752
 753 struct iscsi_node_stat_grps {
 754         struct config_group     iscsi_sess_stats_group;
 755         struct config_group     iscsi_conn_stats_group;
 756 };
 757
 758 struct iscsi_node_acl {
 759         struct se_node_acl      se_node_acl;
 760         struct iscsi_node_attrib node_attrib;
 761         struct iscsi_node_auth  node_auth;
 762         struct iscsi_node_stat_grps node_stat_grps;
 763 };
 764
 765 struct iscsi_tpg_attrib {
 766         u32                     authentication;
 767         u32                     login_timeout;
 768         u32                     netif_timeout;
 769         u32                     generate_node_acls;
 770         u32                     cache_dynamic_acls;
 771         u32                     default_cmdsn_depth;
 772         u32                     demo_mode_write_protect;
 773         u32                     prod_mode_write_protect;
 774         u32                     demo_mode_discovery;
 775         u32                     default_erl;
 776         u8                      t10_pi;
 777         u32                     fabric_prot_type;
 778         u32                     tpg_enabled_sendtargets;
 779         u32                     login_keys_workaround;
 780         struct iscsi_portal_group *tpg;
 781 };
 782
 783 struct iscsi_np {
 784         int                     np_network_transport;
 785         int                     np_ip_proto;
 786         int                     np_sock_type;
 787         enum np_thread_state_table np_thread_state;
 788         bool                    enabled;
 789         atomic_t                np_reset_count;
 790         enum iscsi_timer_flags_table np_login_timer_flags;
 791         u32                     np_exports;
 792         enum np_flags_table     np_flags;
 793         spinlock_t              np_thread_lock;
 794         struct completion       np_restart_comp;
 795         struct socket           *np_socket;
 796         struct sockaddr_storage np_sockaddr;
 797         struct task_struct      *np_thread;
 798         struct timer_list       np_login_timer;
 799         void                    *np_context;
 800         struct iscsit_transport *np_transport;
 801         struct list_head        np_list;
 802 } ____cacheline_aligned;
 803
 804 struct iscsi_tpg_np {
 805         struct iscsi_np         *tpg_np;
 806         struct iscsi_portal_group *tpg;
 807         struct iscsi_tpg_np     *tpg_np_parent;
 808         struct list_head        tpg_np_list;
 809         struct list_head        tpg_np_child_list;
 810         struct list_head        tpg_np_parent_list;
 811         struct se_tpg_np        se_tpg_np;
 812         spinlock_t              tpg_np_parent_lock;
 813         struct completion       tpg_np_comp;
 814         struct kref             tpg_np_kref;
 815 };
 816
 817 struct iscsi_portal_group {
 818         unsigned char           tpg_chap_id;
 819         /* TPG State */
 820         enum tpg_state_table    tpg_state;
 821         /* Target Portal Group Tag */
 822         u16                     tpgt;
 823         /* Id assigned to target sessions */
 824         u16                     ntsih;
 825         /* Number of active sessions */
 826         u32                     nsessions;
 827         /* Number of Network Portals available for this TPG */
 828         u32                     num_tpg_nps;
 829         /* Per TPG LIO specific session ID. */
 830         u32                     sid;
 831         /* Spinlock for adding/removing Network Portals */
 832         spinlock_t              tpg_np_lock;
 833         spinlock_t              tpg_state_lock;
 834         struct se_portal_group tpg_se_tpg;
 835         struct mutex            tpg_access_lock;
 836         struct semaphore        np_login_sem;
 837         struct iscsi_tpg_attrib tpg_attrib;
 838         struct iscsi_node_auth  tpg_demo_auth;
 839         /* Pointer to default list of iSCSI parameters for TPG */
 840         struct iscsi_param_list *param_list;
 841         struct iscsi_tiqn       *tpg_tiqn;
 842         struct list_head        tpg_gnp_list;
 843         struct list_head        tpg_list;
 844 } ____cacheline_aligned;
 845
 846 struct iscsi_wwn_stat_grps {
 847         struct config_group     iscsi_stat_group;
 848         struct config_group     iscsi_instance_group;
 849         struct config_group     iscsi_sess_err_group;
 850         struct config_group     iscsi_tgt_attr_group;
 851         struct config_group     iscsi_login_stats_group;
 852         struct config_group     iscsi_logout_stats_group;
 853 };
 854
 855 struct iscsi_tiqn {
 856 #define ISCSI_IQN_LEN                           224
 857         unsigned char           tiqn[ISCSI_IQN_LEN];
 858         enum tiqn_state_table   tiqn_state;
 859         int                     tiqn_access_count;
 860         u32                     tiqn_active_tpgs;
 861         u32                     tiqn_ntpgs;
 862         u32                     tiqn_num_tpg_nps;
 863         u32                     tiqn_nsessions;
 864         struct list_head        tiqn_list;
 865         struct list_head        tiqn_tpg_list;
 866         spinlock_t              tiqn_state_lock;
 867         spinlock_t              tiqn_tpg_lock;
 868         struct se_wwn           tiqn_wwn;
 869         struct iscsi_wwn_stat_grps tiqn_stat_grps;
 870         int                     tiqn_index;
 871         struct iscsi_sess_err_stats  sess_err_stats;
 872         struct iscsi_login_stats     login_stats;
 873         struct iscsi_logout_stats    logout_stats;
 874 } ____cacheline_aligned;
 875
 876 struct iscsit_global {
 877         /* In core shutdown */
 878         u32                     in_shutdown;
 879         u32                     active_ts;
 880         /* Unique identifier used for the authentication daemon */
 881         u32                     auth_id;
 882         u32                     inactive_ts;
 883 #define ISCSIT_BITMAP_BITS      262144
 884         /* Thread Set bitmap pointer */
 885         unsigned long           *ts_bitmap;
 886         spinlock_t              ts_bitmap_lock;
 887         /* Used for iSCSI discovery session authentication */
 888         struct iscsi_node_acl   discovery_acl;
 889         struct iscsi_portal_group       *discovery_tpg;
 890 };
 891
 892 static inline u32 session_get_next_ttt(struct iscsi_session *session)
 893 {
 894         u32 ttt;
 895
 896         spin_lock_bh(&session->ttt_lock);
 897         ttt = session->targ_xfer_tag++;
 898         if (ttt == 0xFFFFFFFF)
 899                 ttt = session->targ_xfer_tag++;
 900         spin_unlock_bh(&session->ttt_lock);
 901
 902         return ttt;
 903 }
 904
 905 extern struct iscsi_cmd *iscsit_find_cmd_from_itt(struct iscsi_conn *, itt_t);
 906
 907 static inline void iscsit_thread_check_cpumask(
 908         struct iscsi_conn *conn,
 909         struct task_struct *p,
 910         int mode)
 911 {
 912         /*
 913          * mode == 1 signals iscsi_target_tx_thread() usage.
 914          * mode == 0 signals iscsi_target_rx_thread() usage.
 915          */
 916         if (mode == 1) {
 917                 if (!conn->conn_tx_reset_cpumask)
 918                         return;
 919                 conn->conn_tx_reset_cpumask = 0;
 920         } else {
 921                 if (!conn->conn_rx_reset_cpumask)
 922                         return;
 923                 conn->conn_rx_reset_cpumask = 0;
 924         }
 925         /*
 926          * Update the CPU mask for this single kthread so that
 927          * both TX and RX kthreads are scheduled to run on the
 928          * same CPU.
 929          */
 930         set_cpus_allowed_ptr(p, conn->conn_cpumask);
 931 }
 932 #endif /* ISCSI_TARGET_CORE_H */