include/target/iscsi/iscsi_target_core.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef ISCSI_TARGET_CORE_H
   3 #define ISCSI_TARGET_CORE_H
   4
   5 #include <linux/dma-direction.h>     /* enum dma_data_direction */
   6 #include <linux/list.h>              /* struct list_head */
   7 #include <linux/sched.h>
   8 #include <linux/socket.h>            /* struct sockaddr_storage */
   9 #include <linux/types.h>             /* u8 */
  10 #include <scsi/iscsi_proto.h>        /* itt_t */
  11 #include <target/target_core_base.h> /* struct se_cmd */
  12
  13 struct sock;
  14
  15 #define ISCSIT_VERSION                  "v4.1.0"
  16 #define ISCSI_MAX_DATASN_MISSING_COUNT  16
  17 #define ISCSI_TX_THREAD_TCP_TIMEOUT     2
  18 #define ISCSI_RX_THREAD_TCP_TIMEOUT     2
  19 #define SECONDS_FOR_ASYNC_LOGOUT        10
  20 #define SECONDS_FOR_ASYNC_TEXT          10
  21 #define SECONDS_FOR_LOGOUT_COMP         15
  22 #define WHITE_SPACE                     " \t\v\f\n\r"
  23 #define ISCSIT_MIN_TAGS                 16
  24 #define ISCSIT_EXTRA_TAGS               8
  25 #define ISCSIT_TCP_BACKLOG              256
  26 #define ISCSI_RX_THREAD_NAME            "iscsi_trx"
  27 #define ISCSI_TX_THREAD_NAME            "iscsi_ttx"
  28
  29 /* struct iscsi_node_attrib sanity values */
  30 #define NA_DATAOUT_TIMEOUT              3
  31 #define NA_DATAOUT_TIMEOUT_MAX          60
  32 #define NA_DATAOUT_TIMEOUT_MIX          2
  33 #define NA_DATAOUT_TIMEOUT_RETRIES      5
  34 #define NA_DATAOUT_TIMEOUT_RETRIES_MAX  15
  35 #define NA_DATAOUT_TIMEOUT_RETRIES_MIN  1
  36 #define NA_NOPIN_TIMEOUT                15
  37 #define NA_NOPIN_TIMEOUT_MAX            60
  38 #define NA_NOPIN_TIMEOUT_MIN            3
  39 #define NA_NOPIN_RESPONSE_TIMEOUT       30
  40 #define NA_NOPIN_RESPONSE_TIMEOUT_MAX   60
  41 #define NA_NOPIN_RESPONSE_TIMEOUT_MIN   3
  42 #define NA_RANDOM_DATAIN_PDU_OFFSETS    0
  43 #define NA_RANDOM_DATAIN_SEQ_OFFSETS    0
  44 #define NA_RANDOM_R2T_OFFSETS           0
  45
  46 /* struct iscsi_tpg_attrib sanity values */
  47 #define TA_AUTHENTICATION               1
  48 #define TA_LOGIN_TIMEOUT                15
  49 #define TA_LOGIN_TIMEOUT_MAX            30
  50 #define TA_LOGIN_TIMEOUT_MIN            5
  51 #define TA_NETIF_TIMEOUT                2
  52 #define TA_NETIF_TIMEOUT_MAX            15
  53 #define TA_NETIF_TIMEOUT_MIN            2
  54 #define TA_GENERATE_NODE_ACLS           0
  55 #define TA_DEFAULT_CMDSN_DEPTH          64
  56 #define TA_DEFAULT_CMDSN_DEPTH_MAX      512
  57 #define TA_DEFAULT_CMDSN_DEPTH_MIN      1
  58 #define TA_CACHE_DYNAMIC_ACLS           0
  59 /* Enabled by default in demo mode (generic_node_acls=1) */
  60 #define TA_DEMO_MODE_WRITE_PROTECT      1
  61 /* Disabled by default in production mode w/ explict ACLs */
  62 #define TA_PROD_MODE_WRITE_PROTECT      0
  63 #define TA_DEMO_MODE_DISCOVERY          1
  64 #define TA_DEFAULT_ERL                  0
  65 #define TA_CACHE_CORE_NPS               0
  66 /* T10 protection information disabled by default */
  67 #define TA_DEFAULT_T10_PI               0
  68 #define TA_DEFAULT_FABRIC_PROT_TYPE     0
  69 /* TPG status needs to be enabled to return sendtargets discovery endpoint info */
  70 #define TA_DEFAULT_TPG_ENABLED_SENDTARGETS 1
  71 /*
  72  * Used to control the sending of keys with optional to respond state bit,
  73  * as a workaround for non RFC compliant initiators,that do not propose,
  74  * nor respond to specific keys required for login to complete.
  75  *
  76  * See iscsi_check_proposer_for_optional_reply() for more details.
  77  */
  78 #define TA_DEFAULT_LOGIN_KEYS_WORKAROUND 1
  79
  80 #define ISCSI_IOV_DATA_BUFFER           5
  81
  82 enum iscsit_transport_type {
  83         ISCSI_TCP                               = 0,
  84         ISCSI_SCTP_TCP                          = 1,
  85         ISCSI_SCTP_UDP                          = 2,
  86         ISCSI_IWARP_TCP                         = 3,
  87         ISCSI_IWARP_SCTP                        = 4,
  88         ISCSI_INFINIBAND                        = 5,
  89         ISCSI_CXGBIT                            = 6,
  90 };
  91
  92 /* RFC-3720 7.1.4  Standard Connection State Diagram for a Target */
  93 enum target_conn_state_table {
  94         TARG_CONN_STATE_FREE                    = 0x1,
  95         TARG_CONN_STATE_XPT_UP                  = 0x3,
  96         TARG_CONN_STATE_IN_LOGIN                = 0x4,
  97         TARG_CONN_STATE_LOGGED_IN               = 0x5,
  98         TARG_CONN_STATE_IN_LOGOUT               = 0x6,
  99         TARG_CONN_STATE_LOGOUT_REQUESTED        = 0x7,
 100         TARG_CONN_STATE_CLEANUP_WAIT            = 0x8,
 101 };
 102
 103 /* RFC-3720 7.3.2  Session State Diagram for a Target */
 104 enum target_sess_state_table {
 105         TARG_SESS_STATE_FREE                    = 0x1,
 106         TARG_SESS_STATE_ACTIVE                  = 0x2,
 107         TARG_SESS_STATE_LOGGED_IN               = 0x3,
 108         TARG_SESS_STATE_FAILED                  = 0x4,
 109         TARG_SESS_STATE_IN_CONTINUE             = 0x5,
 110 };
 111
 112 /* struct iscsi_data_count->type */
 113 enum data_count_type {
 114         ISCSI_RX_DATA   = 1,
 115         ISCSI_TX_DATA   = 2,
 116 };
 117
 118 /* struct iscsi_datain_req->dr_complete */
 119 enum datain_req_comp_table {
 120         DATAIN_COMPLETE_NORMAL                  = 1,
 121         DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY = 2,
 122         DATAIN_COMPLETE_CONNECTION_RECOVERY     = 3,
 123 };
 124
 125 /* struct iscsi_datain_req->recovery */
 126 enum datain_req_rec_table {
 127         DATAIN_WITHIN_COMMAND_RECOVERY          = 1,
 128         DATAIN_CONNECTION_RECOVERY              = 2,
 129 };
 130
 131 /* struct iscsi_portal_group->state */
 132 enum tpg_state_table {
 133         TPG_STATE_FREE                          = 0,
 134         TPG_STATE_ACTIVE                        = 1,
 135         TPG_STATE_INACTIVE                      = 2,
 136         TPG_STATE_COLD_RESET                    = 3,
 137 };
 138
 139 /* struct iscsi_tiqn->tiqn_state */
 140 enum tiqn_state_table {
 141         TIQN_STATE_ACTIVE                       = 1,
 142         TIQN_STATE_SHUTDOWN                     = 2,
 143 };
 144
 145 /* struct iscsi_cmd->cmd_flags */
 146 enum cmd_flags_table {
 147         ICF_GOT_LAST_DATAOUT                    = 0x00000001,
 148         ICF_GOT_DATACK_SNACK                    = 0x00000002,
 149         ICF_NON_IMMEDIATE_UNSOLICITED_DATA      = 0x00000004,
 150         ICF_SENT_LAST_R2T                       = 0x00000008,
 151         ICF_WITHIN_COMMAND_RECOVERY             = 0x00000010,
 152         ICF_CONTIG_MEMORY                       = 0x00000020,
 153         ICF_ATTACHED_TO_RQUEUE                  = 0x00000040,
 154         ICF_OOO_CMDSN                           = 0x00000080,
 155         ICF_SENDTARGETS_ALL                     = 0x00000100,
 156         ICF_SENDTARGETS_SINGLE                  = 0x00000200,
 157 };
 158
 159 /* struct iscsi_cmd->i_state */
 160 enum cmd_i_state_table {
 161         ISTATE_NO_STATE                 = 0,
 162         ISTATE_NEW_CMD                  = 1,
 163         ISTATE_DEFERRED_CMD             = 2,
 164         ISTATE_UNSOLICITED_DATA         = 3,
 165         ISTATE_RECEIVE_DATAOUT          = 4,
 166         ISTATE_RECEIVE_DATAOUT_RECOVERY = 5,
 167         ISTATE_RECEIVED_LAST_DATAOUT    = 6,
 168         ISTATE_WITHIN_DATAOUT_RECOVERY  = 7,
 169         ISTATE_IN_CONNECTION_RECOVERY   = 8,
 170         ISTATE_RECEIVED_TASKMGT         = 9,
 171         ISTATE_SEND_ASYNCMSG            = 10,
 172         ISTATE_SENT_ASYNCMSG            = 11,
 173         ISTATE_SEND_DATAIN              = 12,
 174         ISTATE_SEND_LAST_DATAIN         = 13,
 175         ISTATE_SENT_LAST_DATAIN         = 14,
 176         ISTATE_SEND_LOGOUTRSP           = 15,
 177         ISTATE_SENT_LOGOUTRSP           = 16,
 178         ISTATE_SEND_NOPIN               = 17,
 179         ISTATE_SENT_NOPIN               = 18,
 180         ISTATE_SEND_REJECT              = 19,
 181         ISTATE_SENT_REJECT              = 20,
 182         ISTATE_SEND_R2T                 = 21,
 183         ISTATE_SENT_R2T                 = 22,
 184         ISTATE_SEND_R2T_RECOVERY        = 23,
 185         ISTATE_SENT_R2T_RECOVERY        = 24,
 186         ISTATE_SEND_LAST_R2T            = 25,
 187         ISTATE_SENT_LAST_R2T            = 26,
 188         ISTATE_SEND_LAST_R2T_RECOVERY   = 27,
 189         ISTATE_SENT_LAST_R2T_RECOVERY   = 28,
 190         ISTATE_SEND_STATUS              = 29,
 191         ISTATE_SEND_STATUS_BROKEN_PC    = 30,
 192         ISTATE_SENT_STATUS              = 31,
 193         ISTATE_SEND_STATUS_RECOVERY     = 32,
 194         ISTATE_SENT_STATUS_RECOVERY     = 33,
 195         ISTATE_SEND_TASKMGTRSP          = 34,
 196         ISTATE_SENT_TASKMGTRSP          = 35,
 197         ISTATE_SEND_TEXTRSP             = 36,
 198         ISTATE_SENT_TEXTRSP             = 37,
 199         ISTATE_SEND_NOPIN_WANT_RESPONSE = 38,
 200         ISTATE_SENT_NOPIN_WANT_RESPONSE = 39,
 201         ISTATE_SEND_NOPIN_NO_RESPONSE   = 40,
 202         ISTATE_REMOVE                   = 41,
 203         ISTATE_FREE                     = 42,
 204 };
 205
 206 /* Used for iscsi_recover_cmdsn() return values */
 207 enum recover_cmdsn_ret_table {
 208         CMDSN_ERROR_CANNOT_RECOVER      = -1,
 209         CMDSN_NORMAL_OPERATION          = 0,
 210         CMDSN_LOWER_THAN_EXP            = 1,
 211         CMDSN_HIGHER_THAN_EXP           = 2,
 212         CMDSN_MAXCMDSN_OVERRUN          = 3,
 213 };
 214
 215 /* Used for iscsi_handle_immediate_data() return values */
 216 enum immedate_data_ret_table {
 217         IMMEDIATE_DATA_CANNOT_RECOVER   = -1,
 218         IMMEDIATE_DATA_NORMAL_OPERATION = 0,
 219         IMMEDIATE_DATA_ERL1_CRC_FAILURE = 1,
 220 };
 221
 222 /* Used for iscsi_decide_dataout_action() return values */
 223 enum dataout_action_ret_table {
 224         DATAOUT_CANNOT_RECOVER          = -1,
 225         DATAOUT_NORMAL                  = 0,
 226         DATAOUT_SEND_R2T                = 1,
 227         DATAOUT_SEND_TO_TRANSPORT       = 2,
 228         DATAOUT_WITHIN_COMMAND_RECOVERY = 3,
 229 };
 230
 231 /* Used for struct iscsi_node_auth->naf_flags */
 232 enum naf_flags_table {
 233         NAF_USERID_SET                  = 0x01,
 234         NAF_PASSWORD_SET                = 0x02,
 235         NAF_USERID_IN_SET               = 0x04,
 236         NAF_PASSWORD_IN_SET             = 0x08,
 237 };
 238
 239 /* Used by various struct timer_list to manage iSCSI specific state */
 240 enum iscsi_timer_flags_table {
 241         ISCSI_TF_RUNNING                = 0x01,
 242         ISCSI_TF_STOP                   = 0x02,
 243         ISCSI_TF_EXPIRED                = 0x04,
 244 };
 245
 246 /* Used for struct iscsi_np->np_flags */
 247 enum np_flags_table {
 248         NPF_IP_NETWORK          = 0x00,
 249 };
 250
 251 /* Used for struct iscsi_np->np_thread_state */
 252 enum np_thread_state_table {
 253         ISCSI_NP_THREAD_ACTIVE          = 1,
 254         ISCSI_NP_THREAD_INACTIVE        = 2,
 255         ISCSI_NP_THREAD_RESET           = 3,
 256         ISCSI_NP_THREAD_SHUTDOWN        = 4,
 257         ISCSI_NP_THREAD_EXIT            = 5,
 258 };
 259
 260 struct iscsi_conn_ops {
 261         u8      HeaderDigest;                   /* [0,1] == [None,CRC32C] */
 262         u8      DataDigest;                     /* [0,1] == [None,CRC32C] */
 263         u32     MaxRecvDataSegmentLength;       /* [512..2**24-1] */
 264         u32     MaxXmitDataSegmentLength;       /* [512..2**24-1] */
 265         /*
 266          * iSER specific connection parameters
 267          */
 268         u32     InitiatorRecvDataSegmentLength; /* [512..2**24-1] */
 269         u32     TargetRecvDataSegmentLength;    /* [512..2**24-1] */
 270 };
 271
 272 struct iscsi_sess_ops {
 273         char    InitiatorName[224];
 274         char    InitiatorAlias[256];
 275         char    TargetName[224];
 276         char    TargetAlias[256];
 277         char    TargetAddress[256];
 278         u16     TargetPortalGroupTag;           /* [0..65535] */
 279         u16     MaxConnections;                 /* [1..65535] */
 280         u8      InitialR2T;                     /* [0,1] == [No,Yes] */
 281         u8      ImmediateData;                  /* [0,1] == [No,Yes] */
 282         u32     MaxBurstLength;                 /* [512..2**24-1] */
 283         u32     FirstBurstLength;               /* [512..2**24-1] */
 284         u16     DefaultTime2Wait;               /* [0..3600] */
 285         u16     DefaultTime2Retain;             /* [0..3600] */
 286         u16     MaxOutstandingR2T;              /* [1..65535] */
 287         u8      DataPDUInOrder;                 /* [0,1] == [No,Yes] */
 288         u8      DataSequenceInOrder;            /* [0,1] == [No,Yes] */
 289         u8      ErrorRecoveryLevel;             /* [0..2] */
 290         u8      SessionType;                    /* [0,1] == [Normal,Discovery]*/
 291         /*
 292          * iSER specific session parameters
 293          */
 294         u8      RDMAExtensions;                 /* [0,1] == [No,Yes] */
 295 };
 296
 297 struct iscsi_queue_req {
 298         int                     state;
 299         struct iscsi_cmd        *cmd;
 300         struct list_head        qr_list;
 301 };
 302
 303 struct iscsi_data_count {
 304         int                     data_length;
 305         int                     sync_and_steering;
 306         enum data_count_type    type;
 307         u32                     iov_count;
 308         u32                     ss_iov_count;
 309         u32                     ss_marker_count;
 310         struct kvec             *iov;
 311 };
 312
 313 struct iscsi_param_list {
 314         bool                    iser;
 315         struct list_head        param_list;
 316         struct list_head        extra_response_list;
 317 };
 318
 319 struct iscsi_datain_req {
 320         enum datain_req_comp_table dr_complete;
 321         int                     generate_recovery_values;
 322         enum datain_req_rec_table recovery;
 323         u32                     begrun;
 324         u32                     runlength;
 325         u32                     data_length;
 326         u32                     data_offset;
 327         u32                     data_sn;
 328         u32                     next_burst_len;
 329         u32                     read_data_done;
 330         u32                     seq_send_order;
 331         struct list_head        cmd_datain_node;
 332 } ____cacheline_aligned;
 333
 334 struct iscsi_ooo_cmdsn {
 335         u16                     cid;
 336         u32                     batch_count;
 337         u32                     cmdsn;
 338         u32                     exp_cmdsn;
 339         struct iscsi_cmd        *cmd;
 340         struct list_head        ooo_list;
 341 } ____cacheline_aligned;
 342
 343 struct iscsi_datain {
 344         u8                      flags;
 345         u32                     data_sn;
 346         u32                     length;
 347         u32                     offset;
 348 } ____cacheline_aligned;
 349
 350 struct iscsi_r2t {
 351         int                     seq_complete;
 352         int                     recovery_r2t;
 353         int                     sent_r2t;
 354         u32                     r2t_sn;
 355         u32                     offset;
 356         u32                     targ_xfer_tag;
 357         u32                     xfer_len;
 358         struct list_head        r2t_list;
 359 } ____cacheline_aligned;
 360
 361 struct iscsi_cmd {
 362         enum iscsi_timer_flags_table dataout_timer_flags;
 363         /* DataOUT timeout retries */
 364         u8                      dataout_timeout_retries;
 365         /* Within command recovery count */
 366         u8                      error_recovery_count;
 367         /* iSCSI dependent state for out or order CmdSNs */
 368         enum cmd_i_state_table  deferred_i_state;
 369         /* iSCSI dependent state */
 370         enum cmd_i_state_table  i_state;
 371         /* Command is an immediate command (ISCSI_OP_IMMEDIATE set) */
 372         u8                      immediate_cmd;
 373         /* Immediate data present */
 374         u8                      immediate_data;
 375         /* iSCSI Opcode */
 376         u8                      iscsi_opcode;
 377         /* iSCSI Response Code */
 378         u8                      iscsi_response;
 379         /* Logout reason when iscsi_opcode == ISCSI_INIT_LOGOUT_CMND */
 380         u8                      logout_reason;
 381         /* Logout response code when iscsi_opcode == ISCSI_INIT_LOGOUT_CMND */
 382         u8                      logout_response;
 383         /* MaxCmdSN has been incremented */
 384         u8                      maxcmdsn_inc;
 385         /* Immediate Unsolicited Dataout */
 386         u8                      unsolicited_data;
 387         /* Reject reason code */
 388         u8                      reject_reason;
 389         /* CID contained in logout PDU when opcode == ISCSI_INIT_LOGOUT_CMND */
 390         u16                     logout_cid;
 391         /* Command flags */
 392         enum cmd_flags_table    cmd_flags;
 393         /* Initiator Task Tag assigned from Initiator */
 394         itt_t                   init_task_tag;
 395         /* Target Transfer Tag assigned from Target */
 396         u32                     targ_xfer_tag;
 397         /* CmdSN assigned from Initiator */
 398         u32                     cmd_sn;
 399         /* ExpStatSN assigned from Initiator */
 400         u32                     exp_stat_sn;
 401         /* StatSN assigned to this ITT */
 402         u32                     stat_sn;
 403         /* DataSN Counter */
 404         u32                     data_sn;
 405         /* R2TSN Counter */
 406         u32                     r2t_sn;
 407         /* Last DataSN acknowledged via DataAck SNACK */
 408         u32                     acked_data_sn;
 409         /* Used for echoing NOPOUT ping data */
 410         u32                     buf_ptr_size;
 411         /* Used to store DataDigest */
 412         u32                     data_crc;
 413         /* Counter for MaxOutstandingR2T */
 414         u32                     outstanding_r2ts;
 415         /* Next R2T Offset when DataSequenceInOrder=Yes */
 416         u32                     r2t_offset;
 417         /* Iovec current and orig count for iscsi_cmd->iov_data */
 418         u32                     iov_data_count;
 419         u32                     orig_iov_data_count;
 420         /* Number of miscellaneous iovecs used for IP stack calls */
 421         u32                     iov_misc_count;
 422         /* Number of struct iscsi_pdu in struct iscsi_cmd->pdu_list */
 423         u32                     pdu_count;
 424         /* Next struct iscsi_pdu to send in struct iscsi_cmd->pdu_list */
 425         u32                     pdu_send_order;
 426         /* Current struct iscsi_pdu in struct iscsi_cmd->pdu_list */
 427         u32                     pdu_start;
 428         /* Next struct iscsi_seq to send in struct iscsi_cmd->seq_list */
 429         u32                     seq_send_order;
 430         /* Number of struct iscsi_seq in struct iscsi_cmd->seq_list */
 431         u32                     seq_count;
 432         /* Current struct iscsi_seq in struct iscsi_cmd->seq_list */
 433         u32                     seq_no;
 434         /* Lowest offset in current DataOUT sequence */
 435         u32                     seq_start_offset;
 436         /* Highest offset in current DataOUT sequence */
 437         u32                     seq_end_offset;
 438         /* Total size in bytes received so far of READ data */
 439         u32                     read_data_done;
 440         /* Total size in bytes received so far of WRITE data */
 441         u32                     write_data_done;
 442         /* Counter for FirstBurstLength key */
 443         u32                     first_burst_len;
 444         /* Counter for MaxBurstLength key */
 445         u32                     next_burst_len;
 446         /* Transfer size used for IP stack calls */
 447         u32                     tx_size;
 448         /* Buffer used for various purposes */
 449         void                    *buf_ptr;
 450         /* Used by SendTargets=[iqn.,eui.] discovery */
 451         void                    *text_in_ptr;
 452         /* See include/linux/dma-mapping.h */
 453         enum dma_data_direction data_direction;
 454         /* iSCSI PDU Header + CRC */
 455         unsigned char           pdu[ISCSI_HDR_LEN + ISCSI_CRC_LEN];
 456         /* Number of times struct iscsi_cmd is present in immediate queue */
 457         atomic_t                immed_queue_count;
 458         atomic_t                response_queue_count;
 459         spinlock_t              datain_lock;
 460         spinlock_t              dataout_timeout_lock;
 461         /* spinlock for protecting struct iscsi_cmd->i_state */
 462         spinlock_t              istate_lock;
 463         /* spinlock for adding within command recovery entries */
 464         spinlock_t              error_lock;
 465         /* spinlock for adding R2Ts */
 466         spinlock_t              r2t_lock;
 467         /* DataIN List */
 468         struct list_head        datain_list;
 469         /* R2T List */
 470         struct list_head        cmd_r2t_list;
 471         /* Timer for DataOUT */
 472         struct timer_list       dataout_timer;
 473         /* Iovecs for SCSI data payload RX/TX w/ kernel level sockets */
 474         struct kvec             *iov_data;
 475         /* Iovecs for miscellaneous purposes */
 476 #define ISCSI_MISC_IOVECS                       5
 477         struct kvec             iov_misc[ISCSI_MISC_IOVECS];
 478         /* Array of struct iscsi_pdu used for DataPDUInOrder=No */
 479         struct iscsi_pdu        *pdu_list;
 480         /* Current struct iscsi_pdu used for DataPDUInOrder=No */
 481         struct iscsi_pdu        *pdu_ptr;
 482         /* Array of struct iscsi_seq used for DataSequenceInOrder=No */
 483         struct iscsi_seq        *seq_list;
 484         /* Current struct iscsi_seq used for DataSequenceInOrder=No */
 485         struct iscsi_seq        *seq_ptr;
 486         /* TMR Request when iscsi_opcode == ISCSI_OP_SCSI_TMFUNC */
 487         struct iscsi_tmr_req    *tmr_req;
 488         /* Connection this command is alligient to */
 489         struct iscsi_conn       *conn;
 490         /* Pointer to connection recovery entry */
 491         struct iscsi_conn_recovery *cr;
 492         /* Session the command is part of,  used for connection recovery */
 493         struct iscsi_session    *sess;
 494         /* list_head for connection list */
 495         struct list_head        i_conn_node;
 496         /* The TCM I/O descriptor that is accessed via container_of() */
 497         struct se_cmd           se_cmd;
 498         /* Sense buffer that will be mapped into outgoing status */
 499 #define ISCSI_SENSE_BUFFER_LEN          (TRANSPORT_SENSE_BUFFER + 2)
 500         unsigned char           sense_buffer[ISCSI_SENSE_BUFFER_LEN];
 501
 502         u32                     padding;
 503         u8                      pad_bytes[4];
 504
 505         struct scatterlist      *first_data_sg;
 506         u32                     first_data_sg_off;
 507         u32                     kmapped_nents;
 508         sense_reason_t          sense_reason;
 509 }  ____cacheline_aligned;
 510
 511 struct iscsi_tmr_req {
 512         bool                    task_reassign:1;
 513         u32                     exp_data_sn;
 514         struct iscsi_cmd        *ref_cmd;
 515         struct iscsi_conn_recovery *conn_recovery;
 516         struct se_tmr_req       *se_tmr_req;
 517 };
 518
 519 struct iscsi_conn {
 520         wait_queue_head_t       queues_wq;
 521         /* Authentication Successful for this connection */
 522         u8                      auth_complete;
 523         /* State connection is currently in */
 524         u8                      conn_state;
 525         u8                      conn_logout_reason;
 526         u8                      network_transport;
 527         enum iscsi_timer_flags_table nopin_timer_flags;
 528         enum iscsi_timer_flags_table nopin_response_timer_flags;
 529         /* Used to know what thread encountered a transport failure */
 530         u8                      which_thread;
 531         /* connection id assigned by the Initiator */
 532         u16                     cid;
 533         /* Remote TCP Port */
 534         u16                     login_port;
 535         int                     net_size;
 536         int                     login_family;
 537         u32                     auth_id;
 538         u32                     conn_flags;
 539         /* Used for iscsi_tx_login_rsp() */
 540         itt_t                   login_itt;
 541         u32                     exp_statsn;
 542         /* Per connection status sequence number */
 543         u32                     stat_sn;
 544         struct sockaddr_storage login_sockaddr;
 545         struct sockaddr_storage local_sockaddr;
 546         int                     conn_usage_count;
 547         int                     conn_waiting_on_uc;
 548         atomic_t                check_immediate_queue;
 549         atomic_t                conn_logout_remove;
 550         atomic_t                connection_exit;
 551         atomic_t                connection_recovery;
 552         atomic_t                connection_reinstatement;
 553         atomic_t                connection_wait_rcfr;
 554         atomic_t                sleep_on_conn_wait_comp;
 555         atomic_t                transport_failed;
 556         struct completion       conn_post_wait_comp;
 557         struct completion       conn_wait_comp;
 558         struct completion       conn_wait_rcfr_comp;
 559         struct completion       conn_waiting_on_uc_comp;
 560         struct completion       conn_logout_comp;
 561         struct completion       tx_half_close_comp;
 562         struct completion       rx_half_close_comp;
 563         /* socket used by this connection */
 564         struct socket           *sock;
 565         void                    (*orig_data_ready)(struct sock *);
 566         void                    (*orig_state_change)(struct sock *);
 567 #define LOGIN_FLAGS_READ_ACTIVE         1
 568 #define LOGIN_FLAGS_CLOSED              2
 569 #define LOGIN_FLAGS_READY               4
 570 #define LOGIN_FLAGS_INITIAL_PDU         8
 571         unsigned long           login_flags;
 572         struct delayed_work     login_work;
 573         struct iscsi_login      *login;
 574         struct timer_list       nopin_timer;
 575         struct timer_list       nopin_response_timer;
 576         struct timer_list       transport_timer;
 577         struct task_struct      *login_kworker;
 578         /* Spinlock used for add/deleting cmd's from conn_cmd_list */
 579         spinlock_t              cmd_lock;
 580         spinlock_t              conn_usage_lock;
 581         spinlock_t              immed_queue_lock;
 582         spinlock_t              nopin_timer_lock;
 583         spinlock_t              response_queue_lock;
 584         spinlock_t              state_lock;
 585         /* libcrypto RX and TX contexts for crc32c */
 586         struct ahash_request    *conn_rx_hash;
 587         struct ahash_request    *conn_tx_hash;
 588         /* Used for scheduling TX and RX connection kthreads */
 589         cpumask_var_t           conn_cpumask;
 590         unsigned int            conn_rx_reset_cpumask:1;
 591         unsigned int            conn_tx_reset_cpumask:1;
 592         /* list_head of struct iscsi_cmd for this connection */
 593         struct list_head        conn_cmd_list;
 594         struct list_head        immed_queue_list;
 595         struct list_head        response_queue_list;
 596         struct iscsi_conn_ops   *conn_ops;
 597         struct iscsi_login      *conn_login;
 598         struct iscsit_transport *conn_transport;
 599         struct iscsi_param_list *param_list;
 600         /* Used for per connection auth state machine */
 601         void                    *auth_protocol;
 602         void                    *context;
 603         struct iscsi_login_thread_s *login_thread;
 604         struct iscsi_portal_group *tpg;
 605         struct iscsi_tpg_np     *tpg_np;
 606         /* Pointer to parent session */
 607         struct iscsi_session    *sess;
 608         int                     bitmap_id;
 609         int                     rx_thread_active;
 610         struct task_struct      *rx_thread;
 611         struct completion       rx_login_comp;
 612         int                     tx_thread_active;
 613         struct task_struct      *tx_thread;
 614         /* list_head for session connection list */
 615         struct list_head        conn_list;
 616 } ____cacheline_aligned;
 617
 618 struct iscsi_conn_recovery {
 619         u16                     cid;
 620         u32                     cmd_count;
 621         u32                     maxrecvdatasegmentlength;
 622         u32                     maxxmitdatasegmentlength;
 623         int                     ready_for_reallegiance;
 624         struct list_head        conn_recovery_cmd_list;
 625         spinlock_t              conn_recovery_cmd_lock;
 626         struct timer_list       time2retain_timer;
 627         struct iscsi_session    *sess;
 628         struct list_head        cr_list;
 629 }  ____cacheline_aligned;
 630
 631 struct iscsi_session {
 632         u8                      initiator_vendor;
 633         u8                      isid[6];
 634         enum iscsi_timer_flags_table time2retain_timer_flags;
 635         u8                      version_active;
 636         u16                     cid_called;
 637         u16                     conn_recovery_count;
 638         u16                     tsih;
 639         /* state session is currently in */
 640         u32                     session_state;
 641         /* session wide counter: initiator assigned task tag */
 642         itt_t                   init_task_tag;
 643         /* session wide counter: target assigned task tag */
 644         u32                     targ_xfer_tag;
 645         u32                     cmdsn_window;
 646
 647         /* protects cmdsn values */
 648         struct mutex            cmdsn_mutex;
 649         /* session wide counter: expected command sequence number */
 650         u32                     exp_cmd_sn;
 651         /* session wide counter: maximum allowed command sequence number */
 652         atomic_t                max_cmd_sn;
 653         struct list_head        sess_ooo_cmdsn_list;
 654
 655         /* LIO specific session ID */
 656         u32                     sid;
 657         char                    auth_type[8];
 658         /* unique within the target */
 659         int                     session_index;
 660         /* Used for session reference counting */
 661         int                     session_usage_count;
 662         int                     session_waiting_on_uc;
 663         atomic_long_t           cmd_pdus;
 664         atomic_long_t           rsp_pdus;
 665         atomic_long_t           tx_data_octets;
 666         atomic_long_t           rx_data_octets;
 667         atomic_long_t           conn_digest_errors;
 668         atomic_long_t           conn_timeout_errors;
 669         u64                     creation_time;
 670         /* Number of active connections */
 671         atomic_t                nconn;
 672         atomic_t                session_continuation;
 673         atomic_t                session_fall_back_to_erl0;
 674         atomic_t                session_logout;
 675         atomic_t                session_reinstatement;
 676         atomic_t                session_stop_active;
 677         atomic_t                session_close;
 678         /* connection list */
 679         struct list_head        sess_conn_list;
 680         struct list_head        cr_active_list;
 681         struct list_head        cr_inactive_list;
 682         spinlock_t              conn_lock;
 683         spinlock_t              cr_a_lock;
 684         spinlock_t              cr_i_lock;
 685         spinlock_t              session_usage_lock;
 686         spinlock_t              ttt_lock;
 687         struct completion       async_msg_comp;
 688         struct completion       reinstatement_comp;
 689         struct completion       session_wait_comp;
 690         struct completion       session_waiting_on_uc_comp;
 691         struct timer_list       time2retain_timer;
 692         struct iscsi_sess_ops   *sess_ops;
 693         struct se_session       *se_sess;
 694         struct iscsi_portal_group *tpg;
 695 } ____cacheline_aligned;
 696
 697 struct iscsi_login {
 698         u8 auth_complete;
 699         u8 checked_for_existing;
 700         u8 current_stage;
 701         u8 leading_connection;
 702         u8 first_request;
 703         u8 version_min;
 704         u8 version_max;
 705         u8 login_complete;
 706         u8 login_failed;
 707         bool zero_tsih;
 708         char isid[6];
 709         u32 cmd_sn;
 710         itt_t init_task_tag;
 711         u32 initial_exp_statsn;
 712         u32 rsp_length;
 713         u16 cid;
 714         u16 tsih;
 715         char req[ISCSI_HDR_LEN];
 716         char rsp[ISCSI_HDR_LEN];
 717         char *req_buf;
 718         char *rsp_buf;
 719         struct iscsi_conn *conn;
 720         struct iscsi_np *np;
 721 } ____cacheline_aligned;
 722
 723 struct iscsi_node_attrib {
 724         u32                     dataout_timeout;
 725         u32                     dataout_timeout_retries;
 726         u32                     default_erl;
 727         u32                     nopin_timeout;
 728         u32                     nopin_response_timeout;
 729         u32                     random_datain_pdu_offsets;
 730         u32                     random_datain_seq_offsets;
 731         u32                     random_r2t_offsets;
 732         u32                     tmr_cold_reset;
 733         u32                     tmr_warm_reset;
 734         struct iscsi_node_acl *nacl;
 735 };
 736
 737 struct se_dev_entry_s;
 738
 739 struct iscsi_node_auth {
 740         enum naf_flags_table    naf_flags;
 741         int                     authenticate_target;
 742         /* Used for iscsit_global->discovery_auth,
 743          * set to zero (auth disabled) by default */
 744         int                     enforce_discovery_auth;
 745 #define MAX_USER_LEN                            256
 746 #define MAX_PASS_LEN                            256
 747         char                    userid[MAX_USER_LEN];
 748         char                    password[MAX_PASS_LEN];
 749         char                    userid_mutual[MAX_USER_LEN];
 750         char                    password_mutual[MAX_PASS_LEN];
 751 };
 752
 753 #include "iscsi_target_stat.h"
 754
 755 struct iscsi_node_stat_grps {
 756         struct config_group     iscsi_sess_stats_group;
 757         struct config_group     iscsi_conn_stats_group;
 758 };
 759
 760 struct iscsi_node_acl {
 761         struct se_node_acl      se_node_acl;
 762         struct iscsi_node_attrib node_attrib;
 763         struct iscsi_node_auth  node_auth;
 764         struct iscsi_node_stat_grps node_stat_grps;
 765 };
 766
 767 struct iscsi_tpg_attrib {
 768         u32                     authentication;
 769         u32                     login_timeout;
 770         u32                     netif_timeout;
 771         u32                     generate_node_acls;
 772         u32                     cache_dynamic_acls;
 773         u32                     default_cmdsn_depth;
 774         u32                     demo_mode_write_protect;
 775         u32                     prod_mode_write_protect;
 776         u32                     demo_mode_discovery;
 777         u32                     default_erl;
 778         u8                      t10_pi;
 779         u32                     fabric_prot_type;
 780         u32                     tpg_enabled_sendtargets;
 781         u32                     login_keys_workaround;
 782         struct iscsi_portal_group *tpg;
 783 };
 784
 785 struct iscsi_np {
 786         int                     np_network_transport;
 787         int                     np_ip_proto;
 788         int                     np_sock_type;
 789         enum np_thread_state_table np_thread_state;
 790         bool                    enabled;
 791         atomic_t                np_reset_count;
 792         enum iscsi_timer_flags_table np_login_timer_flags;
 793         u32                     np_exports;
 794         enum np_flags_table     np_flags;
 795         spinlock_t              np_thread_lock;
 796         struct completion       np_restart_comp;
 797         struct socket           *np_socket;
 798         struct sockaddr_storage np_sockaddr;
 799         struct task_struct      *np_thread;
 800         struct timer_list       np_login_timer;
 801         void                    *np_context;
 802         struct iscsit_transport *np_transport;
 803         struct list_head        np_list;
 804 } ____cacheline_aligned;
 805
 806 struct iscsi_tpg_np {
 807         struct iscsi_np         *tpg_np;
 808         struct iscsi_portal_group *tpg;
 809         struct iscsi_tpg_np     *tpg_np_parent;
 810         struct list_head        tpg_np_list;
 811         struct list_head        tpg_np_child_list;
 812         struct list_head        tpg_np_parent_list;
 813         struct se_tpg_np        se_tpg_np;
 814         spinlock_t              tpg_np_parent_lock;
 815         struct completion       tpg_np_comp;
 816         struct kref             tpg_np_kref;
 817 };
 818
 819 struct iscsi_portal_group {
 820         unsigned char           tpg_chap_id;
 821         /* TPG State */
 822         enum tpg_state_table    tpg_state;
 823         /* Target Portal Group Tag */
 824         u16                     tpgt;
 825         /* Id assigned to target sessions */
 826         u16                     ntsih;
 827         /* Number of active sessions */
 828         u32                     nsessions;
 829         /* Number of Network Portals available for this TPG */
 830         u32                     num_tpg_nps;
 831         /* Per TPG LIO specific session ID. */
 832         u32                     sid;
 833         /* Spinlock for adding/removing Network Portals */
 834         spinlock_t              tpg_np_lock;
 835         spinlock_t              tpg_state_lock;
 836         struct se_portal_group tpg_se_tpg;
 837         struct mutex            tpg_access_lock;
 838         struct semaphore        np_login_sem;
 839         struct iscsi_tpg_attrib tpg_attrib;
 840         struct iscsi_node_auth  tpg_demo_auth;
 841         /* Pointer to default list of iSCSI parameters for TPG */
 842         struct iscsi_param_list *param_list;
 843         struct iscsi_tiqn       *tpg_tiqn;
 844         struct list_head        tpg_gnp_list;
 845         struct list_head        tpg_list;
 846 } ____cacheline_aligned;
 847
 848 struct iscsi_wwn_stat_grps {
 849         struct config_group     iscsi_stat_group;
 850         struct config_group     iscsi_instance_group;
 851         struct config_group     iscsi_sess_err_group;
 852         struct config_group     iscsi_tgt_attr_group;
 853         struct config_group     iscsi_login_stats_group;
 854         struct config_group     iscsi_logout_stats_group;
 855 };
 856
 857 struct iscsi_tiqn {
 858 #define ISCSI_IQN_LEN                           224
 859         unsigned char           tiqn[ISCSI_IQN_LEN];
 860         enum tiqn_state_table   tiqn_state;
 861         int                     tiqn_access_count;
 862         u32                     tiqn_active_tpgs;
 863         u32                     tiqn_ntpgs;
 864         u32                     tiqn_num_tpg_nps;
 865         u32                     tiqn_nsessions;
 866         struct list_head        tiqn_list;
 867         struct list_head        tiqn_tpg_list;
 868         spinlock_t              tiqn_state_lock;
 869         spinlock_t              tiqn_tpg_lock;
 870         struct se_wwn           tiqn_wwn;
 871         struct iscsi_wwn_stat_grps tiqn_stat_grps;
 872         int                     tiqn_index;
 873         struct iscsi_sess_err_stats  sess_err_stats;
 874         struct iscsi_login_stats     login_stats;
 875         struct iscsi_logout_stats    logout_stats;
 876 } ____cacheline_aligned;
 877
 878 struct iscsit_global {
 879         /* In core shutdown */
 880         u32                     in_shutdown;
 881         u32                     active_ts;
 882         /* Unique identifier used for the authentication daemon */
 883         u32                     auth_id;
 884         u32                     inactive_ts;
 885 #define ISCSIT_BITMAP_BITS      262144
 886         /* Thread Set bitmap pointer */
 887         unsigned long           *ts_bitmap;
 888         spinlock_t              ts_bitmap_lock;
 889         /* Used for iSCSI discovery session authentication */
 890         struct iscsi_node_acl   discovery_acl;
 891         struct iscsi_portal_group       *discovery_tpg;
 892 };
 893
 894 static inline u32 session_get_next_ttt(struct iscsi_session *session)
 895 {
 896         u32 ttt;
 897
 898         spin_lock_bh(&session->ttt_lock);
 899         ttt = session->targ_xfer_tag++;
 900         if (ttt == 0xFFFFFFFF)
 901                 ttt = session->targ_xfer_tag++;
 902         spin_unlock_bh(&session->ttt_lock);
 903
 904         return ttt;
 905 }
 906
 907 extern struct iscsi_cmd *iscsit_find_cmd_from_itt(struct iscsi_conn *, itt_t);
 908
 909 static inline void iscsit_thread_check_cpumask(
 910         struct iscsi_conn *conn,
 911         struct task_struct *p,
 912         int mode)
 913 {
 914         /*
 915          * mode == 1 signals iscsi_target_tx_thread() usage.
 916          * mode == 0 signals iscsi_target_rx_thread() usage.
 917          */
 918         if (mode == 1) {
 919                 if (!conn->conn_tx_reset_cpumask)
 920                         return;
 921                 conn->conn_tx_reset_cpumask = 0;
 922         } else {
 923                 if (!conn->conn_rx_reset_cpumask)
 924                         return;
 925                 conn->conn_rx_reset_cpumask = 0;
 926         }
 927         /*
 928          * Update the CPU mask for this single kthread so that
 929          * both TX and RX kthreads are scheduled to run on the
 930          * same CPU.
 931          */
 932         set_cpus_allowed_ptr(p, conn->conn_cpumask);
 933 }
 934 #endif /* ISCSI_TARGET_CORE_H */