include/scsi/iscsi_proto.h

   1 /*
   2  * RFC 3720 (iSCSI) protocol data types
   3  *
   4  * Copyright (C) 2005 Dmitry Yusupov
   5  * Copyright (C) 2005 Alex Aizman
   6  * maintained by open-iscsi@googlegroups.com
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published
  10  * by the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16  * General Public License for more details.
  17  *
  18  * See the file COPYING included with this distribution for more details.
  19  */
  20
  21 #ifndef ISCSI_PROTO_H
  22 #define ISCSI_PROTO_H
  23
  24 #define ISCSI_DRAFT20_VERSION   0x00
  25
  26 /* default iSCSI listen port for incoming connections */
  27 #define ISCSI_LISTEN_PORT       3260
  28
  29 /* Padding word length */
  30 #define PAD_WORD_LEN            4
  31
  32 /*
  33  * useful common(control and data pathes) macro
  34  */
  35 #define ntoh24(p) (((p)[0] << 16) | ((p)[1] << 8) | ((p)[2]))
  36 #define hton24(p, v) { \
  37         p[0] = (((v) >> 16) & 0xFF); \
  38         p[1] = (((v) >> 8) & 0xFF); \
  39         p[2] = ((v) & 0xFF); \
  40 }
  41 #define zero_data(p) {p[0]=0;p[1]=0;p[2]=0;}
  42
  43 /* initiator tags; opaque for target */
  44 typedef uint32_t __bitwise__ itt_t;
  45 /* below makes sense only for initiator that created this tag */
  46 #define build_itt(itt, id, age) ((__force itt_t)\
  47         ((itt) | ((id) << ISCSI_CID_SHIFT) | ((age) << ISCSI_AGE_SHIFT)))
  48 #define get_itt(itt) ((__force uint32_t)(itt_t)(itt) & ISCSI_ITT_MASK)
  49 #define RESERVED_ITT ((__force itt_t)0xffffffff)
  50
  51 /*
  52  * iSCSI Template Message Header
  53  */
  54 struct iscsi_hdr {
  55         uint8_t         opcode;
  56         uint8_t         flags;          /* Final bit */
  57         uint8_t         rsvd2[2];
  58         uint8_t         hlength;        /* AHSs total length */
  59         uint8_t         dlength[3];     /* Data length */
  60         uint8_t         lun[8];
  61         itt_t           itt;            /* Initiator Task Tag, opaque for target */
  62         __be32          ttt;            /* Target Task Tag */
  63         __be32          statsn;
  64         __be32          exp_statsn;
  65         __be32          max_statsn;
  66         uint8_t         other[12];
  67 };
  68
  69 /************************* RFC 3720 Begin *****************************/
  70
  71 #define ISCSI_RESERVED_TAG              0xffffffff
  72
  73 /* Opcode encoding bits */
  74 #define ISCSI_OP_RETRY                  0x80
  75 #define ISCSI_OP_IMMEDIATE              0x40
  76 #define ISCSI_OPCODE_MASK               0x3F
  77
  78 /* Initiator Opcode values */
  79 #define ISCSI_OP_NOOP_OUT               0x00
  80 #define ISCSI_OP_SCSI_CMD               0x01
  81 #define ISCSI_OP_SCSI_TMFUNC            0x02
  82 #define ISCSI_OP_LOGIN                  0x03
  83 #define ISCSI_OP_TEXT                   0x04
  84 #define ISCSI_OP_SCSI_DATA_OUT          0x05
  85 #define ISCSI_OP_LOGOUT                 0x06
  86 #define ISCSI_OP_SNACK                  0x10
  87
  88 #define ISCSI_OP_VENDOR1_CMD            0x1c
  89 #define ISCSI_OP_VENDOR2_CMD            0x1d
  90 #define ISCSI_OP_VENDOR3_CMD            0x1e
  91 #define ISCSI_OP_VENDOR4_CMD            0x1f
  92
  93 /* Target Opcode values */
  94 #define ISCSI_OP_NOOP_IN                0x20
  95 #define ISCSI_OP_SCSI_CMD_RSP           0x21
  96 #define ISCSI_OP_SCSI_TMFUNC_RSP        0x22
  97 #define ISCSI_OP_LOGIN_RSP              0x23
  98 #define ISCSI_OP_TEXT_RSP               0x24
  99 #define ISCSI_OP_SCSI_DATA_IN           0x25
 100 #define ISCSI_OP_LOGOUT_RSP             0x26
 101 #define ISCSI_OP_R2T                    0x31
 102 #define ISCSI_OP_ASYNC_EVENT            0x32
 103 #define ISCSI_OP_REJECT                 0x3f
 104
 105 struct iscsi_ahs_hdr {
 106         __be16 ahslength;
 107         uint8_t ahstype;
 108         uint8_t ahspec[5];
 109 };
 110
 111 #define ISCSI_AHSTYPE_CDB               1
 112 #define ISCSI_AHSTYPE_RLENGTH           2
 113
 114 /* iSCSI PDU Header */
 115 struct iscsi_cmd {
 116         uint8_t opcode;
 117         uint8_t flags;
 118         __be16 rsvd2;
 119         uint8_t hlength;
 120         uint8_t dlength[3];
 121         uint8_t lun[8];
 122         itt_t    itt;   /* Initiator Task Tag */
 123         __be32 data_length;
 124         __be32 cmdsn;
 125         __be32 exp_statsn;
 126         uint8_t cdb[16];        /* SCSI Command Block */
 127         /* Additional Data (Command Dependent) */
 128 };
 129
 130 /* Command PDU flags */
 131 #define ISCSI_FLAG_CMD_FINAL            0x80
 132 #define ISCSI_FLAG_CMD_READ             0x40
 133 #define ISCSI_FLAG_CMD_WRITE            0x20
 134 #define ISCSI_FLAG_CMD_ATTR_MASK        0x07    /* 3 bits */
 135
 136 /* SCSI Command Attribute values */
 137 #define ISCSI_ATTR_UNTAGGED             0
 138 #define ISCSI_ATTR_SIMPLE               1
 139 #define ISCSI_ATTR_ORDERED              2
 140 #define ISCSI_ATTR_HEAD_OF_QUEUE        3
 141 #define ISCSI_ATTR_ACA                  4
 142
 143 struct iscsi_rlength_ahdr {
 144         __be16 ahslength;
 145         uint8_t ahstype;
 146         uint8_t reserved;
 147         __be32 read_length;
 148 };
 149
 150 /* SCSI Response Header */
 151 struct iscsi_cmd_rsp {
 152         uint8_t opcode;
 153         uint8_t flags;
 154         uint8_t response;
 155         uint8_t cmd_status;
 156         uint8_t hlength;
 157         uint8_t dlength[3];
 158         uint8_t rsvd[8];
 159         itt_t    itt;   /* Initiator Task Tag */
 160         __be32  rsvd1;
 161         __be32  statsn;
 162         __be32  exp_cmdsn;
 163         __be32  max_cmdsn;
 164         __be32  exp_datasn;
 165         __be32  bi_residual_count;
 166         __be32  residual_count;
 167         /* Response or Sense Data (optional) */
 168 };
 169
 170 /* Command Response PDU flags */
 171 #define ISCSI_FLAG_CMD_BIDI_OVERFLOW    0x10
 172 #define ISCSI_FLAG_CMD_BIDI_UNDERFLOW   0x08
 173 #define ISCSI_FLAG_CMD_OVERFLOW         0x04
 174 #define ISCSI_FLAG_CMD_UNDERFLOW        0x02
 175
 176 /* iSCSI Status values. Valid if Rsp Selector bit is not set */
 177 #define ISCSI_STATUS_CMD_COMPLETED      0
 178 #define ISCSI_STATUS_TARGET_FAILURE     1
 179 #define ISCSI_STATUS_SUBSYS_FAILURE     2
 180
 181 /* Asynchronous Event Header */
 182 struct iscsi_async {
 183         uint8_t opcode;
 184         uint8_t flags;
 185         uint8_t rsvd2[2];
 186         uint8_t rsvd3;
 187         uint8_t dlength[3];
 188         uint8_t lun[8];
 189         uint8_t rsvd4[8];
 190         __be32  statsn;
 191         __be32  exp_cmdsn;
 192         __be32  max_cmdsn;
 193         uint8_t async_event;
 194         uint8_t async_vcode;
 195         __be16  param1;
 196         __be16  param2;
 197         __be16  param3;
 198         uint8_t rsvd5[4];
 199 };
 200
 201 /* iSCSI Event Codes */
 202 #define ISCSI_ASYNC_MSG_SCSI_EVENT                      0
 203 #define ISCSI_ASYNC_MSG_REQUEST_LOGOUT                  1
 204 #define ISCSI_ASYNC_MSG_DROPPING_CONNECTION             2
 205 #define ISCSI_ASYNC_MSG_DROPPING_ALL_CONNECTIONS        3
 206 #define ISCSI_ASYNC_MSG_PARAM_NEGOTIATION               4
 207 #define ISCSI_ASYNC_MSG_VENDOR_SPECIFIC                 255
 208
 209 /* NOP-Out Message */
 210 struct iscsi_nopout {
 211         uint8_t opcode;
 212         uint8_t flags;
 213         __be16  rsvd2;
 214         uint8_t rsvd3;
 215         uint8_t dlength[3];
 216         uint8_t lun[8];
 217         itt_t    itt;   /* Initiator Task Tag */
 218         __be32  ttt;    /* Target Transfer Tag */
 219         __be32  cmdsn;
 220         __be32  exp_statsn;
 221         uint8_t rsvd4[16];
 222 };
 223
 224 /* NOP-In Message */
 225 struct iscsi_nopin {
 226         uint8_t opcode;
 227         uint8_t flags;
 228         __be16  rsvd2;
 229         uint8_t rsvd3;
 230         uint8_t dlength[3];
 231         uint8_t lun[8];
 232         itt_t    itt;   /* Initiator Task Tag */
 233         __be32  ttt;    /* Target Transfer Tag */
 234         __be32  statsn;
 235         __be32  exp_cmdsn;
 236         __be32  max_cmdsn;
 237         uint8_t rsvd4[12];
 238 };
 239
 240 /* SCSI Task Management Message Header */
 241 struct iscsi_tm {
 242         uint8_t opcode;
 243         uint8_t flags;
 244         uint8_t rsvd1[2];
 245         uint8_t hlength;
 246         uint8_t dlength[3];
 247         uint8_t lun[8];
 248         itt_t    itt;   /* Initiator Task Tag */
 249         itt_t    rtt;   /* Reference Task Tag */
 250         __be32  cmdsn;
 251         __be32  exp_statsn;
 252         __be32  refcmdsn;
 253         __be32  exp_datasn;
 254         uint8_t rsvd2[8];
 255 };
 256
 257 #define ISCSI_FLAG_TM_FUNC_MASK                 0x7F
 258
 259 /* Function values */
 260 #define ISCSI_TM_FUNC_ABORT_TASK                1
 261 #define ISCSI_TM_FUNC_ABORT_TASK_SET            2
 262 #define ISCSI_TM_FUNC_CLEAR_ACA                 3
 263 #define ISCSI_TM_FUNC_CLEAR_TASK_SET            4
 264 #define ISCSI_TM_FUNC_LOGICAL_UNIT_RESET        5
 265 #define ISCSI_TM_FUNC_TARGET_WARM_RESET         6
 266 #define ISCSI_TM_FUNC_TARGET_COLD_RESET         7
 267 #define ISCSI_TM_FUNC_TASK_REASSIGN             8
 268
 269 /* SCSI Task Management Response Header */
 270 struct iscsi_tm_rsp {
 271         uint8_t opcode;
 272         uint8_t flags;
 273         uint8_t response;       /* see Response values below */
 274         uint8_t qualifier;
 275         uint8_t hlength;
 276         uint8_t dlength[3];
 277         uint8_t rsvd2[8];
 278         itt_t    itt;   /* Initiator Task Tag */
 279         itt_t    rtt;   /* Reference Task Tag */
 280         __be32  statsn;
 281         __be32  exp_cmdsn;
 282         __be32  max_cmdsn;
 283         uint8_t rsvd3[12];
 284 };
 285
 286 /* Response values */
 287 #define ISCSI_TMF_RSP_COMPLETE          0x00
 288 #define ISCSI_TMF_RSP_NO_TASK           0x01
 289 #define ISCSI_TMF_RSP_NO_LUN            0x02
 290 #define ISCSI_TMF_RSP_TASK_ALLEGIANT    0x03
 291 #define ISCSI_TMF_RSP_NO_FAILOVER       0x04
 292 #define ISCSI_TMF_RSP_NOT_SUPPORTED     0x05
 293 #define ISCSI_TMF_RSP_AUTH_FAILED       0x06
 294 #define ISCSI_TMF_RSP_REJECTED          0xff
 295
 296 /* Ready To Transfer Header */
 297 struct iscsi_r2t_rsp {
 298         uint8_t opcode;
 299         uint8_t flags;
 300         uint8_t rsvd2[2];
 301         uint8_t hlength;
 302         uint8_t dlength[3];
 303         uint8_t lun[8];
 304         itt_t    itt;   /* Initiator Task Tag */
 305         __be32  ttt;    /* Target Transfer Tag */
 306         __be32  statsn;
 307         __be32  exp_cmdsn;
 308         __be32  max_cmdsn;
 309         __be32  r2tsn;
 310         __be32  data_offset;
 311         __be32  data_length;
 312 };
 313
 314 /* SCSI Data Hdr */
 315 struct iscsi_data {
 316         uint8_t opcode;
 317         uint8_t flags;
 318         uint8_t rsvd2[2];
 319         uint8_t rsvd3;
 320         uint8_t dlength[3];
 321         uint8_t lun[8];
 322         itt_t    itt;
 323         __be32  ttt;
 324         __be32  rsvd4;
 325         __be32  exp_statsn;
 326         __be32  rsvd5;
 327         __be32  datasn;
 328         __be32  offset;
 329         __be32  rsvd6;
 330         /* Payload */
 331 };
 332
 333 /* SCSI Data Response Hdr */
 334 struct iscsi_data_rsp {
 335         uint8_t opcode;
 336         uint8_t flags;
 337         uint8_t rsvd2;
 338         uint8_t cmd_status;
 339         uint8_t hlength;
 340         uint8_t dlength[3];
 341         uint8_t lun[8];
 342         itt_t    itt;
 343         __be32  ttt;
 344         __be32  statsn;
 345         __be32  exp_cmdsn;
 346         __be32  max_cmdsn;
 347         __be32  datasn;
 348         __be32  offset;
 349         __be32  residual_count;
 350 };
 351
 352 /* Data Response PDU flags */
 353 #define ISCSI_FLAG_DATA_ACK             0x40
 354 #define ISCSI_FLAG_DATA_OVERFLOW        0x04
 355 #define ISCSI_FLAG_DATA_UNDERFLOW       0x02
 356 #define ISCSI_FLAG_DATA_STATUS          0x01
 357
 358 /* Text Header */
 359 struct iscsi_text {
 360         uint8_t opcode;
 361         uint8_t flags;
 362         uint8_t rsvd2[2];
 363         uint8_t hlength;
 364         uint8_t dlength[3];
 365         uint8_t rsvd4[8];
 366         itt_t    itt;
 367         __be32  ttt;
 368         __be32  cmdsn;
 369         __be32  exp_statsn;
 370         uint8_t rsvd5[16];
 371         /* Text - key=value pairs */
 372 };
 373
 374 #define ISCSI_FLAG_TEXT_CONTINUE        0x40
 375
 376 /* Text Response Header */
 377 struct iscsi_text_rsp {
 378         uint8_t opcode;
 379         uint8_t flags;
 380         uint8_t rsvd2[2];
 381         uint8_t hlength;
 382         uint8_t dlength[3];
 383         uint8_t rsvd4[8];
 384         itt_t    itt;
 385         __be32  ttt;
 386         __be32  statsn;
 387         __be32  exp_cmdsn;
 388         __be32  max_cmdsn;
 389         uint8_t rsvd5[12];
 390         /* Text Response - key:value pairs */
 391 };
 392
 393 /* Login Header */
 394 struct iscsi_login {
 395         uint8_t opcode;
 396         uint8_t flags;
 397         uint8_t max_version;    /* Max. version supported */
 398         uint8_t min_version;    /* Min. version supported */
 399         uint8_t hlength;
 400         uint8_t dlength[3];
 401         uint8_t isid[6];        /* Initiator Session ID */
 402         __be16  tsih;   /* Target Session Handle */
 403         itt_t    itt;   /* Initiator Task Tag */
 404         __be16  cid;
 405         __be16  rsvd3;
 406         __be32  cmdsn;
 407         __be32  exp_statsn;
 408         uint8_t rsvd5[16];
 409 };
 410
 411 /* Login PDU flags */
 412 #define ISCSI_FLAG_LOGIN_TRANSIT                0x80
 413 #define ISCSI_FLAG_LOGIN_CONTINUE               0x40
 414 #define ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK     0x0C    /* 2 bits */
 415 #define ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK        0x03    /* 2 bits */
 416
 417 #define ISCSI_LOGIN_CURRENT_STAGE(flags) \
 418         ((flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2)
 419 #define ISCSI_LOGIN_NEXT_STAGE(flags) \
 420         (flags & ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK)
 421
 422 /* Login Response Header */
 423 struct iscsi_login_rsp {
 424         uint8_t opcode;
 425         uint8_t flags;
 426         uint8_t max_version;    /* Max. version supported */
 427         uint8_t active_version; /* Active version */
 428         uint8_t hlength;
 429         uint8_t dlength[3];
 430         uint8_t isid[6];        /* Initiator Session ID */
 431         __be16  tsih;   /* Target Session Handle */
 432         itt_t    itt;   /* Initiator Task Tag */
 433         __be32  rsvd3;
 434         __be32  statsn;
 435         __be32  exp_cmdsn;
 436         __be32  max_cmdsn;
 437         uint8_t status_class;   /* see Login RSP ststus classes below */
 438         uint8_t status_detail;  /* see Login RSP Status details below */
 439         uint8_t rsvd4[10];
 440 };
 441
 442 /* Login stage (phase) codes for CSG, NSG */
 443 #define ISCSI_INITIAL_LOGIN_STAGE               -1
 444 #define ISCSI_SECURITY_NEGOTIATION_STAGE        0
 445 #define ISCSI_OP_PARMS_NEGOTIATION_STAGE        1
 446 #define ISCSI_FULL_FEATURE_PHASE                3
 447
 448 /* Login Status response classes */
 449 #define ISCSI_STATUS_CLS_SUCCESS                0x00
 450 #define ISCSI_STATUS_CLS_REDIRECT               0x01
 451 #define ISCSI_STATUS_CLS_INITIATOR_ERR          0x02
 452 #define ISCSI_STATUS_CLS_TARGET_ERR             0x03
 453
 454 /* Login Status response detail codes */
 455 /* Class-0 (Success) */
 456 #define ISCSI_LOGIN_STATUS_ACCEPT               0x00
 457
 458 /* Class-1 (Redirection) */
 459 #define ISCSI_LOGIN_STATUS_TGT_MOVED_TEMP       0x01
 460 #define ISCSI_LOGIN_STATUS_TGT_MOVED_PERM       0x02
 461
 462 /* Class-2 (Initiator Error) */
 463 #define ISCSI_LOGIN_STATUS_INIT_ERR             0x00
 464 #define ISCSI_LOGIN_STATUS_AUTH_FAILED          0x01
 465 #define ISCSI_LOGIN_STATUS_TGT_FORBIDDEN        0x02
 466 #define ISCSI_LOGIN_STATUS_TGT_NOT_FOUND        0x03
 467 #define ISCSI_LOGIN_STATUS_TGT_REMOVED          0x04
 468 #define ISCSI_LOGIN_STATUS_NO_VERSION           0x05
 469 #define ISCSI_LOGIN_STATUS_ISID_ERROR           0x06
 470 #define ISCSI_LOGIN_STATUS_MISSING_FIELDS       0x07
 471 #define ISCSI_LOGIN_STATUS_CONN_ADD_FAILED      0x08
 472 #define ISCSI_LOGIN_STATUS_NO_SESSION_TYPE      0x09
 473 #define ISCSI_LOGIN_STATUS_NO_SESSION           0x0a
 474 #define ISCSI_LOGIN_STATUS_INVALID_REQUEST      0x0b
 475
 476 /* Class-3 (Target Error) */
 477 #define ISCSI_LOGIN_STATUS_TARGET_ERROR         0x00
 478 #define ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE      0x01
 479 #define ISCSI_LOGIN_STATUS_NO_RESOURCES         0x02
 480
 481 /* Logout Header */
 482 struct iscsi_logout {
 483         uint8_t opcode;
 484         uint8_t flags;
 485         uint8_t rsvd1[2];
 486         uint8_t hlength;
 487         uint8_t dlength[3];
 488         uint8_t rsvd2[8];
 489         itt_t    itt;   /* Initiator Task Tag */
 490         __be16  cid;
 491         uint8_t rsvd3[2];
 492         __be32  cmdsn;
 493         __be32  exp_statsn;
 494         uint8_t rsvd4[16];
 495 };
 496
 497 /* Logout PDU flags */
 498 #define ISCSI_FLAG_LOGOUT_REASON_MASK   0x7F
 499
 500 /* logout reason_code values */
 501
 502 #define ISCSI_LOGOUT_REASON_CLOSE_SESSION       0
 503 #define ISCSI_LOGOUT_REASON_CLOSE_CONNECTION    1
 504 #define ISCSI_LOGOUT_REASON_RECOVERY            2
 505 #define ISCSI_LOGOUT_REASON_AEN_REQUEST         3
 506
 507 /* Logout Response Header */
 508 struct iscsi_logout_rsp {
 509         uint8_t opcode;
 510         uint8_t flags;
 511         uint8_t response;       /* see Logout response values below */
 512         uint8_t rsvd2;
 513         uint8_t hlength;
 514         uint8_t dlength[3];
 515         uint8_t rsvd3[8];
 516         itt_t    itt;   /* Initiator Task Tag */
 517         __be32  rsvd4;
 518         __be32  statsn;
 519         __be32  exp_cmdsn;
 520         __be32  max_cmdsn;
 521         __be32  rsvd5;
 522         __be16  t2wait;
 523         __be16  t2retain;
 524         __be32  rsvd6;
 525 };
 526
 527 /* logout response status values */
 528
 529 #define ISCSI_LOGOUT_SUCCESS                    0
 530 #define ISCSI_LOGOUT_CID_NOT_FOUND              1
 531 #define ISCSI_LOGOUT_RECOVERY_UNSUPPORTED       2
 532 #define ISCSI_LOGOUT_CLEANUP_FAILED             3
 533
 534 /* SNACK Header */
 535 struct iscsi_snack {
 536         uint8_t opcode;
 537         uint8_t flags;
 538         uint8_t rsvd2[14];
 539         itt_t    itt;
 540         __be32  begrun;
 541         __be32  runlength;
 542         __be32  exp_statsn;
 543         __be32  rsvd3;
 544         __be32  exp_datasn;
 545         uint8_t rsvd6[8];
 546 };
 547
 548 /* SNACK PDU flags */
 549 #define ISCSI_FLAG_SNACK_TYPE_MASK      0x0F    /* 4 bits */
 550
 551 /* Reject Message Header */
 552 struct iscsi_reject {
 553         uint8_t opcode;
 554         uint8_t flags;
 555         uint8_t reason;
 556         uint8_t rsvd2;
 557         uint8_t hlength;
 558         uint8_t dlength[3];
 559         uint8_t rsvd3[8];
 560         __be32  ffffffff;
 561         uint8_t rsvd4[4];
 562         __be32  statsn;
 563         __be32  exp_cmdsn;
 564         __be32  max_cmdsn;
 565         __be32  datasn;
 566         uint8_t rsvd5[8];
 567         /* Text - Rejected hdr */
 568 };
 569
 570 /* Reason for Reject */
 571 #define ISCSI_REASON_CMD_BEFORE_LOGIN   1
 572 #define ISCSI_REASON_DATA_DIGEST_ERROR  2
 573 #define ISCSI_REASON_DATA_SNACK_REJECT  3
 574 #define ISCSI_REASON_PROTOCOL_ERROR     4
 575 #define ISCSI_REASON_CMD_NOT_SUPPORTED  5
 576 #define ISCSI_REASON_IMM_CMD_REJECT             6
 577 #define ISCSI_REASON_TASK_IN_PROGRESS   7
 578 #define ISCSI_REASON_INVALID_SNACK              8
 579 #define ISCSI_REASON_BOOKMARK_INVALID   9
 580 #define ISCSI_REASON_BOOKMARK_NO_RESOURCES      10
 581 #define ISCSI_REASON_NEGOTIATION_RESET  11
 582
 583 /* Max. number of Key=Value pairs in a text message */
 584 #define MAX_KEY_VALUE_PAIRS     8192
 585
 586 /* maximum length for text keys/values */
 587 #define KEY_MAXLEN              64
 588 #define VALUE_MAXLEN            255
 589 #define TARGET_NAME_MAXLEN      VALUE_MAXLEN
 590
 591 #define ISCSI_DEF_MAX_RECV_SEG_LEN              8192
 592 #define ISCSI_MIN_MAX_RECV_SEG_LEN              512
 593 #define ISCSI_MAX_MAX_RECV_SEG_LEN              16777215
 594
 595 #define ISCSI_DEF_FIRST_BURST_LEN               65536
 596 #define ISCSI_MIN_FIRST_BURST_LEN               512
 597 #define ISCSI_MAX_FIRST_BURST_LEN               16777215
 598
 599 #define ISCSI_DEF_MAX_BURST_LEN                 262144
 600 #define ISCSI_MIN_MAX_BURST_LEN                 512
 601 #define ISCSI_MAX_MAX_BURST_LEN                 16777215
 602
 603 /************************* RFC 3720 End *****************************/
 604
 605 #endif /* ISCSI_PROTO_H */