ocs_iscsi_spec.h

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/*
 * Copyright (c) 2011-2015, Emulex
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 */

/**
 * @file
 * Defines the iSCSI (HAL) interface functions to the os specific code
 * This code should be OS independant.
 */

#ifndef _OCS_ISCSI_SPEC_H
#define _OCS_ISCSI_SPEC_H

// --- TMF_TASKS ---
#define ISCSI_ABORT_TASK        (1)   // Abort Task
#define ISCSI_ABORT_TASK_SET        (2)   // Abort task set
#define ISCSI_CLEAR_ACA         (3)   // Clear ACA
#define ISCSI_CLEAR_TASK_SET        (4)   // Clear task set
#define ISCSI_LUN_RESET         (5)   // Reset LUN
#define ISCSI_TARGET_WARM_RESET     (6)   // Target warm reset
#define ISCSI_TARGET_COLD_RESET     (7)   // Target cold reset
#define ISCSI_TASK_REASSIGN     (8)   // Task reassign
#define ISCSI_MAX_TMF_OPCODE        (9)   // Max opcode, always add befo

// --- ISCSI_VERSION ---
// iSCSI version parameter in login pdu.
#define ISCSI_VERSION_MAX       (0)
#define ISCSI_VERSION_MIN       (0)

// --- ISCSI_LOGIN_STAGES ---
// iSCSI Login Negotiation Stages.
#define LOGIN_STAGE_NEGOTIATE_SECURITY (0)
#define LOGIN_STAGE_NEGOTIATE_OPERATIONAL (1)
#define LOGIN_STAGE_FULL_FEATURE   (3)

// --- ISCSI_CMD_OPCODES ---
// iSCSI Command Opcodes.
#define ISCSI_CMD_NOOP          (0)
#define ISCSI_CMD_CMD           (1)
#define ISCSI_CMD_TASK          (2)
#define ISCSI_CMD_LOGIN         (3)
#define ISCSI_CMD_TEXT          (4)
#define ISCSI_CMD_DATA_OUT      (5)
#define ISCSI_CMD_LOGOUT        (6)
#define ISCSI_CMD_SNACK         (16)

// --- ISCSI_RESPONSE_OPCODES ---
// iSCSI Response Opcodes.
#define ISCSI_RESP_NOOP         (32)
#define ISCSI_RESP_RESP         (33)
#define ISCSI_RESP_TASK         (34)
#define ISCSI_RESP_LOGIN        (35)
#define ISCSI_RESP_TEXT         (36)
#define ISCSI_RESP_DATAIN       (37)
#define ISCSI_RESP_LOGOUT       (38)
#define ISCSI_RESP_R2T          (49)
#define ISCSI_RESP_ASYNC        (50)
#define ISCSI_RESP_REJECT       (63)

// --- ISCSI_CMD_TAGS ---
// iSCSI Command Tags.
#define ISCSI_UNTAGGED_TAG      (0)
#define ISCSI_SIMPLE_TAG        (1)
#define ISCSI_ORDERED_QUEUE_TAG     (2)
#define ISCSI_HEAD_OF_QUEUE_TAG     (3)
#define ISCSI_ACA_TAG           (4)

// --- ISCSI_RESERVED_FIELDS ---
// Logout Response Codes
#define ISCSI_RESERVED_TTT      (4294967295)

// --- ISCSI_STATUS_CODES ---
// iSCSI Cmd Status Codes sent in status and datain.
#define ISCSI_STATUS_GOOD       (0)
#define ISCSI_STATUS_CHECK      (2)
#define ISCSI_STATUS_BUSY       (8)
#define ISCSI_STATUS_RESERVATION_CONFLICT (24)
#define ISCSI_STATUS_TASKSET_FULL   (40)
#define ISCSI_STATUS_ACA_ACTIVE     (48)
#define ISCSI_STATUS_TASK_ABORTED   (64)

// --- ISCSI_STATUS_PDU_RESP_CODES ---
// iSCSI Status PDU response codes. other iSCSI status response codes are assigned by SCSI
// layer
#define ISCSI_RESPONSE_CMD_COMPLETED    (0)
#define ISCSI_RESPONSE_TARGET_FAILURE   (1)

// --- ISCSI_REJECT_PDU_REASON_CODES ---
// Reject PDU reason codes
#define ISCSI_REJECT_REASON_DATA_DIGEST_ERR (2)
#define ISCSI_REJECT_REASON_SNACK_REJECT (3)
#define ISCSI_REJECT_REASON_PROTOCOL_ERR (4)
#define ISCSI_REJECT_REASON_CMD_NOT_SUPPORTED (5)
#define ISCSI_REJECT_REASON_IMM_CMD_REJECT (6)
#define ISCSI_REJECT_REASON_TASK_IN_PROGRESS (7)
#define ISCSI_REJECT_REASON_INVALID_DATA_ACK (8)
#define ISCSI_REJECT_REASON_INVALID_PDU_FIELD (9)
#define ISCSI_REJECT_REASON_LONG_OPERATION (10)
#define ISCSI_REJECT_REASON_NEG_RESET   (11)
#define ISCSI_REJECT_REASON_WAITING_FOR_LOGOUT (12)

// --- ISCSI_PARAMS_DEFAULT_VALUES ---
// iSCSI parameters default values
#define ISCSI_MAXCONNECTIONS_DEFAULT    (1)
#define ISCSI_DEFAULT_TIME2WAIT     (2)
#define ISCSI_DEFAULT_TIME2RETAIN   (20)
#define ISCSI_FIRSTBURSTSIZE_DEFAULT    (8192)
#define ISCSI_MAXRXDATALENGTH_DEFAULT   (8192)
#define ISCSI_MAXTXDATALENGTH_DEFAULT   (8192)
#define ISCSI_MAXBURSTSIZE_DEFAULT  (65536)

// --- ISCSI_PARAM_LIMITS ---
// ISCSI parameters limits
#define ISCSI_MAXCONNECTIONS_MIN    (1)
#define ISCSI_MAXBURSTSIZE_MIN      (512)
#define ISCSI_FIRSTBURSTSIZE_MIN    (512)
#define ISCSI_MAXRXDATALENGTH_MIN   (512)
#define ISCSI_MAXTXDATALENGTH_MIN   (512)

// --- ISCSI_TASK_MGMT_RESP_CODES ---
// ISCSI Task Mgmt Response Opcodes
#define ISCSI_TASK_MGMT_FUNCTION_COMPLETE (0)
#define ISCSI_TASK_MGMT_TASK_DOES_NOT_EXIST (1)
#define ISCSI_TASK_MGMT_LUN_DOES_NOT_EXIST (2)
#define ISCSI_TASK_MGMT_TASK_STILL_ALLEGIANT (3)
#define ISCSI_TASK_MGMT_TASK_REASSIGN_NOT_SUPPORTED (4)
#define ISCSI_TASK_MGMT_NOT_SUPPORTED   (5)
#define ISCSI_TASK_MGMT_FUNCTION_AUTHORIZATION_FAILED (6)
#define ISCSI_TASK_MGMT_FUNCTION_REJECTED (255)

// --- ISCSI_SESSION_STATES ---
// iSCSI Session States
#define SESS_STATE_FREE         (1)
#define SESS_STATE_ACTIVE       (2)
#define SESS_STATE_LOGGED_IN        (3)
#define SESS_STATE_IN_CLEANUP       (4)
#define SESS_STATE_FAILED       (5)
#define SESS_STATE_IN_CONTINUE      (6)

// --- ISCSI_CONN_STATES ---
// iSCSI Connection States
#define CONN_STATE_FREE         (1)
#define CONN_STATE_NEW_CONN     (2)
#define CONN_STATE_LOGIN_PROGRESS   (3)
#define CONN_STATE_LOGIN_FAILED     (4)
#define CONN_STATE_FULL_FEATURE     (5)
#define CONN_STATE_IN_LOGOUT        (6)
#define CONN_STATE_LOGOUT_REQUESTED (7)
#define CONN_STATE_CLEANUP      (8)

// --- ISCSI_ASYNC_EVENT_TYPES ---
// iSCSI Async Event Types in Async PDU
#define ASYNC_EVENT_SENSE_DATA      (0)
#define ASYNC_EVENT_LOGOUT      (1)
#define ASYNC_EVENT_CONN_CLOSE      (2)
#define ASYNC_EVENT_SESS_CLOSE      (3)
#define ASYNC_EVENT_PARAM_NEGOTIATE (4)
#define ASYNC_EVENT_VENDOR_SPECIFIC (255)

// --- ISCSI_LOGIN_STATUS_TYPES ---
// iSCSI Login status Types in login response PDU
#define LOGIN_STATUS_SUCCESS     (0)
#define LOGIN_STATUS_REDIRECTION (1)
#define LOGIN_STATUS_INI_ERROR   (2)
#define LOGIN_STATUS_TGT_ERROR   (3)

// --- ISCSI_LOGIN_STATUS_DETAIL_TYPES ---
// iSCSI Initiator Login status detail Type in login response PDU
#define LOGIN_STATUS_DETAIL_INI_MISC             (0)
#define LOGIN_STATUS_DETAIL_INI_AUTHENTICATION       (1)
#define LOGIN_STATUS_DETAIL_INI_AUTHORIZATION        (2)
#define LOGIN_STATUS_DETAIL_INI_NOT_FOUND        (3)
#define LOGIN_STATUS_DETAIL_INI_TGT_REMOVED      (4)
#define LOGIN_STATUS_DETAIL_INI_UNSUPPORTED_VERSION  (5)
#define LOGIN_STATUS_DETAIL_INI_TOO_MANY_CXN         (6)
#define LOGIN_STATUS_DETAIL_INI_MISSING_PARAM        (7)
#define LOGIN_STATUS_DETAIL_INI_CANT_INCL_SESSION    (8)
#define LOGIN_STATUS_DETAIL_INI_SESSION_TYPE_NOT_SUP (9)
#define LOGIN_STATUS_DETAIL_INI_SESSION_NOT_EXIST    (0xA)
#define LOGIN_STATUS_DETAIL_INI_INVALID_DURING_LGN   (0xB)

// --- ISCSI_LOGIN_STATUS_DETAIL_TYPES ---
// iSCSI Target Login status detail Type in login response PDU
#define LOGIN_STATUS_DETAIL_TGT_MISC            (0)
#define LOGIN_STATUS_DETAIL_TGT_SERVICE_UNAVAILABLE (1)
#define LOGIN_STATUS_DETAIL_TGT_OUT_OF_RSRC     (2)

// --- ISCSI_LOGOUT_REASON_CODES ---
// iSCSI Logout Reason Codes
#define LOGOUT_REASON_CLOSE_SESS    (0)
#define LOGOUT_REASON_CLOSE_CONN    (1)
#define LOGOUT_REASON_CLOSE_CONN_FOR_RECOVERY (2)

// --- ISCSI_LOGOUT_RESP_CODES ---
// iSCSI Logout Response Codes
#define LOGOUT_RESP_CONN_SESS_CLOSE_SUCCESS (0)
#define LOGOUT_RESP_CID_NOT_FOUND   (1)
#define LOGOUT_RESP_CONN_RECOVERY_NOT_SUPPORTED (2)
#define LOGOUT_RESP_LOGOUT_FAILED   (3)

// --- ISCSI_SESSION_TYPES ---
// iSCSI Session Types
#define SESSION_TYPE_NORMAL     (1)
#define SESSION_TYPE_DISCOVERY      (2)

/**
 * @brief Defines the iSCSI initiator and target session IDs in the PDU header.
 */
typedef struct {
    uint16_t isid0;
    uint16_t isid1;
    uint16_t isid2;
    uint16_t tsid;
} iscsi_isid_tsid_t;

/**
 * @brief Defines the iSCSI AHS and data segment length in the PDU header.
 */
typedef struct {
    uint8_t totalAHSLength;
    uint8_t data_segment_length[3];
} iscsi_hdr_dw2_t;

/**
 * @brief Defines a union to decode the SCSI LUN field in various ways.
 */
typedef union {
    uint64_t lun_64;
    uint32_t lun_32[2];
    uint8_t lun_8[8];
} iscsi_lun_t;

/**
 * @brief Defines the generic iSCSI basic header segment.
 */
#if BYTE_ORDER == LITTLE_ENDIAN
// The iSCSI basic header segment.
typedef struct {
    uint32_t opcode : 6;                 // DWORD 0
    uint32_t immediate : 1;              // DWORD 0
    uint32_t rsvd0 : 1;              // DWORD 0
    uint32_t f : 1;                  // DWORD 0
    uint32_t rsvd1 : 23;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    iscsi_lun_t lun;
    uint32_t itt;                    // DWORD 4
} iscsi_bhs_t;
#else
#endif


/**
 * @brief Defines the iSCSI login PDU header.
 */
#if BYTE_ORDER == LITTLE_ENDIAN
// The iSCSI login cmd header format.
typedef struct {
    uint32_t opcode : 6;                 // DWORD 0
    uint32_t immediate : 1;              // DWORD 0
    uint32_t rsvd0 : 1;              // DWORD 0
    uint32_t nsg : 2;                // DWORD 0
    uint32_t csg : 2;                // DWORD 0
    uint32_t rsvd1 : 2;              // DWORD 0
    uint32_t c : 1;                  // DWORD 0
    uint32_t t : 1;                  // DWORD 0
    uint32_t version_max : 8;            // DWORD 0
    uint32_t version_min : 8;            // DWORD 0
    iscsi_hdr_dw2_t dw2;
    iscsi_isid_tsid_t isid_tsid_ptr;
    uint32_t itt;                    // DWORD 4
    uint32_t cid : 16;               // DWORD 5
    uint32_t rsvd2 : 16;                 // DWORD 5
    uint32_t cmd_sn;                 // DWORD 6
    uint32_t exp_stat_sn;                // DWORD 7
    uint32_t field_rsvd4;                // DWORD 8
    uint32_t field_rsvd5;                // DWORD 9
    uint32_t rsvd3[1];               // DWORDS 10 to 10
    uint32_t rsvd4[1];               // DWORDS 11 to 11
} iscsi_login_cmd_hdr_t;
#else
// The iSCSI login cmd header format.
typedef struct {
    uint32_t version_min : 8;            // DWORD 0
    uint32_t version_max : 8;            // DWORD 0
    uint32_t t : 1;                  // DWORD 0
    uint32_t c : 1;                  // DWORD 0
    uint32_t rsvd1 : 2;              // DWORD 0
    uint32_t csg : 2;                // DWORD 0
    uint32_t nsg : 2;                // DWORD 0
    uint32_t rsvd0 : 1;              // DWORD 0
    uint32_t immediate : 1;              // DWORD 0
    uint32_t opcode : 6;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    iscsi_isid_tsid_t isid_tsid_ptr;
    uint32_t itt;                    // DWORD 4
    uint32_t rsvd2 : 16;                 // DWORD 5
    uint32_t cid : 16;               // DWORD 5
    uint32_t cmd_sn;                 // DWORD 6
    uint32_t exp_stat_sn;                // DWORD 7
    uint32_t field_rsvd4;                // DWORD 8
    uint32_t field_rsvd5;                // DWORD 9
    uint32_t rsvd3[1];               // DWORDS 10 to 10
    uint32_t rsvd4[1];               // DWORDS 11 to 11
} iscsi_login_cmd_hdr_t;
#endif

/**
 * @brief Defines the iSCSI login response PDU header.
 */
#if BYTE_ORDER == LITTLE_ENDIAN
// The iSCSI login response header format.
typedef struct {
    uint32_t opcode : 6;                 // DWORD 0
    uint32_t rsvd0 : 2;              // DWORD 0
    uint32_t nsg : 2;                // DWORD 0
    uint32_t csg : 2;                // DWORD 0
    uint32_t rsvd1 : 2;              // DWORD 0
    uint32_t c : 1;                  // DWORD 0
    uint32_t t : 1;                  // DWORD 0
    uint32_t version_max : 8;            // DWORD 0
    uint32_t version_active : 8;             // DWORD 0
    iscsi_hdr_dw2_t dw2;
    iscsi_isid_tsid_t isid_tsid_ptr;
    uint32_t itt;                    // DWORD 4
    uint32_t rsvd2[1];               // DWORDS 5 to 5
    uint32_t stat_sn;                // DWORD 6
    uint32_t exp_cmd_sn;                 // DWORD 7
    uint32_t max_cmd_sn;                 // DWORD 8
    uint32_t status : 8;                 // DWORD 9
    uint32_t status_detail : 8;          // DWORD 9
    uint32_t rsvd3 : 16;                 // DWORD 9
    uint32_t rsvd4[1];               // DWORDS 10 to 10
    uint32_t rsvd5[1];               // DWORDS 11 to 11
} iscsi_login_response_hdr_t;
#else
// The iSCSI login response header format.
typedef struct {
    uint32_t version_active : 8;             // DWORD 0
    uint32_t version_max : 8;            // DWORD 0
    uint32_t t : 1;                  // DWORD 0
    uint32_t c : 1;                  // DWORD 0
    uint32_t rsvd1 : 2;              // DWORD 0
    uint32_t csg : 2;                // DWORD 0
    uint32_t nsg : 2;                // DWORD 0
    uint32_t rsvd0 : 2;              // DWORD 0
    uint32_t opcode : 6;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    iscsi_isid_tsid_t isid_tsid_ptr;
    uint32_t itt;                    // DWORD 4
    uint32_t rsvd2[1];               // DWORDS 5 to 5
    uint32_t stat_sn;                // DWORD 6
    uint32_t exp_cmd_sn;                 // DWORD 7
    uint32_t max_cmd_sn;                 // DWORD 8
    uint32_t rsvd3 : 16;                 // DWORD 9
    uint32_t status_detail : 8;          // DWORD 9
    uint32_t status : 8;                 // DWORD 9
    uint32_t rsvd4[1];               // DWORDS 10 to 10
    uint32_t rsvd5[1];               // DWORDS 11 to 11
} iscsi_login_response_hdr_t;
#endif

/**
 * @brief Defines the iSCSI logout PDU header.
 */
#if BYTE_ORDER == LITTLE_ENDIAN
// The iSCSI logout cmd header format.
typedef struct {
    uint32_t opcode : 6;                 // DWORD 0
    uint32_t immediate : 1;              // DWORD 0
    uint32_t rsvd0 : 1;              // DWORD 0
    uint32_t reason_code : 7;            // DWORD 0
    uint32_t final : 1;              // DWORD 0
    uint32_t rsvd1 : 16;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    uint32_t rsvd2[1];               // DWORDS 2 to 2
    uint32_t rsvd3[1];               // DWORDS 3 to 3
    uint32_t itt;                    // DWORD 4
    uint32_t cid : 16;               // DWORD 5
    uint32_t rsvd4 : 16;                 // DWORD 5
    uint32_t cmd_sn;                 // DWORD 6
    uint32_t exp_stat_sn;                // DWORD 7
    uint32_t rsvd5[1];               // DWORDS 8 to 8
    uint32_t rsvd6[1];               // DWORDS 9 to 9
    uint32_t rsvd7[1];               // DWORDS 10 to 10
    uint32_t rsvd8[1];               // DWORDS 11 to 11
} iscsi_logout_cmd_hdr_t;
#else
// The iSCSI logout cmd header format.
typedef struct {
    uint32_t rsvd1 : 16;                 // DWORD 0
    uint32_t final : 1;              // DWORD 0
    uint32_t reason_code : 7;            // DWORD 0
    uint32_t rsvd0 : 1;              // DWORD 0
    uint32_t immediate : 1;              // DWORD 0
    uint32_t opcode : 6;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    uint32_t rsvd2[1];               // DWORDS 2 to 2
    uint32_t rsvd3[1];               // DWORDS 3 to 3
    uint32_t itt;                    // DWORD 4
    uint32_t rsvd4 : 16;                 // DWORD 5
    uint32_t cid : 16;               // DWORD 5
    uint32_t cmd_sn;                 // DWORD 6
    uint32_t exp_stat_sn;                // DWORD 7
    uint32_t rsvd5[1];               // DWORDS 8 to 8
    uint32_t rsvd6[1];               // DWORDS 9 to 9
    uint32_t rsvd7[1];               // DWORDS 10 to 10
    uint32_t rsvd8[1];               // DWORDS 11 to 11
} iscsi_logout_cmd_hdr_t;
#endif

/**
 * @brief Defines the iSCSI logout response PDU header.
 */
#if BYTE_ORDER == LITTLE_ENDIAN
// The iSCSI logout response header format.
typedef struct {
    uint32_t opcode : 6;                 // DWORD 0
    uint32_t rsvd0 : 2;              // DWORD 0
    uint32_t rsvd1 : 7;              // DWORD 0
    uint32_t final : 1;              // DWORD 0
    uint32_t response : 8;               // DWORD 0
    uint32_t rsvd2 : 8;              // DWORD 0
    iscsi_hdr_dw2_t dw2;
    uint32_t rsvd3[1];               // DWORDS 2 to 2
    uint32_t rsvd4[1];               // DWORDS 3 to 3
    uint32_t itt;                    // DWORD 4
    uint32_t rsvd5[1];               // DWORDS 5 to 5
    uint32_t stat_sn;                // DWORD 6
    uint32_t exp_cmd_sn;                 // DWORD 7
    uint32_t max_cmd_sn;                 // DWORD 8
    uint32_t rsvd6[1];               // DWORDS 9 to 9
    uint32_t time2wait : 16;             // DWORD 10
    uint32_t time2retain : 16;           // DWORD 10
    uint32_t rsvd7[1];               // DWORDS 11 to 11
} iscsi_logout_response_hdr_t;
#else
// The iSCSI logout response header format.
typedef struct {
    uint32_t rsvd2 : 8;              // DWORD 0
    uint32_t response : 8;               // DWORD 0
    uint32_t final : 1;              // DWORD 0
    uint32_t rsvd1 : 7;              // DWORD 0
    uint32_t rsvd0 : 2;              // DWORD 0
    uint32_t opcode : 6;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    uint32_t rsvd3[1];               // DWORDS 2 to 2
    uint32_t rsvd4[1];               // DWORDS 3 to 3
    uint32_t itt;                    // DWORD 4
    uint32_t rsvd5[1];               // DWORDS 5 to 5
    uint32_t stat_sn;                // DWORD 6
    uint32_t exp_cmd_sn;                 // DWORD 7
    uint32_t max_cmd_sn;                 // DWORD 8
    uint32_t rsvd6[1];               // DWORDS 9 to 9
    uint32_t time2retain : 16;           // DWORD 10
    uint32_t time2wait : 16;             // DWORD 10
    uint32_t rsvd7[1];               // DWORDS 11 to 11
} iscsi_logout_response_hdr_t;
#endif

/**
 * @brief Defines the iSCSI text command PDU header.
 */
#if BYTE_ORDER == LITTLE_ENDIAN
// The iSCSI text cmd header format.
typedef struct {
    uint32_t opcode : 6;                 // DWORD 0
    uint32_t immediate : 1;              // DWORD 0
    uint32_t rsvd0 : 1;              // DWORD 0
    uint32_t rsvd1 : 6;              // DWORD 0
    uint32_t c : 1;                  // DWORD 0
    uint32_t f : 1;                  // DWORD 0
    uint32_t rsvd2 : 16;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    iscsi_lun_t lun;
    uint32_t itt;                    // DWORD 4
    uint32_t target_transfer_tag;            // DWORD 5
    uint32_t cmd_sn;                 // DWORD 6
    uint32_t exp_stat_sn;                // DWORD 7
    uint32_t fld_rsvd4;              // DWORD 8
    uint32_t fld_rsvd5;              // DWORD 9
    uint32_t fld_rsvd6;              // DWORD 10
    uint32_t fld_rsvd7;              // DWORD 11
} iscsi_text_cmd_hdr_t;
#else
// The iSCSI text cmd header format.
typedef struct {
    uint32_t rsvd2 : 16;                 // DWORD 0
    uint32_t f : 1;                  // DWORD 0
    uint32_t c : 1;                  // DWORD 0
    uint32_t rsvd1 : 6;              // DWORD 0
    uint32_t rsvd0 : 1;              // DWORD 0
    uint32_t immediate : 1;              // DWORD 0
    uint32_t opcode : 6;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    iscsi_lun_t lun;
    uint32_t itt;                    // DWORD 4
    uint32_t target_transfer_tag;            // DWORD 5
    uint32_t cmd_sn;                 // DWORD 6
    uint32_t exp_stat_sn;                // DWORD 7
    uint32_t fld_rsvd4;              // DWORD 8
    uint32_t fld_rsvd5;              // DWORD 9
    uint32_t fld_rsvd6;              // DWORD 10
    uint32_t fld_rsvd7;              // DWORD 11
} iscsi_text_cmd_hdr_t;
#endif

/**
 * @brief Defines the iSCSI text response PDU header.
 */
#if BYTE_ORDER == LITTLE_ENDIAN
// The iSCSI text response header format.
typedef struct {
    uint32_t opcode : 6;                 // DWORD 0
    uint32_t rsvd0 : 2;              // DWORD 0
    uint32_t rsvd1 : 6;              // DWORD 0
    uint32_t c : 1;                  // DWORD 0
    uint32_t f : 1;                  // DWORD 0
    uint32_t rsvd2 : 16;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    iscsi_lun_t lun;
    uint32_t itt;                    // DWORD 4
    uint32_t target_transfer_tag;            // DWORD 5
    uint32_t stat_sn;                // DWORD 6
    uint32_t exp_cmd_sn;                 // DWORD 7
    uint32_t max_cmd_sn;                 // DWORD 8
    uint32_t fld_rsvd4;              // DWORD 9
    uint32_t fld_rsvd5;              // DWORD 10
    uint32_t fld_rsvd6;              // DWORD 11
} iscsi_text_response_hdr_t;
#else
// The iSCSI text response header format.
typedef struct {
    uint32_t rsvd2 : 16;                 // DWORD 0
    uint32_t f : 1;                  // DWORD 0
    uint32_t c : 1;                  // DWORD 0
    uint32_t rsvd1 : 6;              // DWORD 0
    uint32_t rsvd0 : 2;              // DWORD 0
    uint32_t opcode : 6;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    iscsi_lun_t lun;
    uint32_t itt;                    // DWORD 4
    uint32_t target_transfer_tag;            // DWORD 5
    uint32_t stat_sn;                // DWORD 6
    uint32_t exp_cmd_sn;                 // DWORD 7
    uint32_t max_cmd_sn;                 // DWORD 8
    uint32_t fld_rsvd4;              // DWORD 9
    uint32_t fld_rsvd5;              // DWORD 10
    uint32_t fld_rsvd6;              // DWORD 11
} iscsi_text_response_hdr_t;
#endif

/**
 * @brief Defines the iSCSI command PDU header.
 */
#if BYTE_ORDER == LITTLE_ENDIAN
// The iSCSI command header format.
typedef struct {
    uint32_t opcode : 6;                 // DWORD 0
    uint32_t immediate : 1;              // DWORD 0
    uint32_t rsvd0 : 1;              // DWORD 0
    uint32_t attributes : 3;             // DWORD 0
    uint32_t rsvd1 : 2;              // DWORD 0
    uint32_t wr : 1;                 // DWORD 0
    uint32_t rd : 1;                 // DWORD 0
    uint32_t final : 1;              // DWORD 0
    uint32_t rsvd2 : 16;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    iscsi_lun_t lun;
    uint32_t itt;                    // DWORD 4
    uint32_t ExpectedDataTransferLength;         // DWORD 5
    uint32_t CmdSN;                  // DWORD 6
    uint32_t ExpStatSN;              // DWORD 7
    uint8_t cdb[16];
} iscsi_cmd_hdr_t;
#else
// The iSCSI command header format.
typedef struct {
    uint32_t rsvd2 : 16;                 // DWORD 0
    uint32_t final : 1;              // DWORD 0
    uint32_t rd : 1;                 // DWORD 0
    uint32_t wr : 1;                 // DWORD 0
    uint32_t rsvd1 : 2;              // DWORD 0
    uint32_t attributes : 3;             // DWORD 0
    uint32_t rsvd0 : 1;              // DWORD 0
    uint32_t immediate : 1;              // DWORD 0
    uint32_t opcode : 6;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    iscsi_lun_t lun;
    uint32_t itt;                    // DWORD 4
    uint32_t ExpectedDataTransferLength;         // DWORD 5
    uint32_t CmdSN;                  // DWORD 6
    uint32_t ExpStatSN;              // DWORD 7
    uint8_t cdb[16];
} iscsi_cmd_hdr_t;
#endif

/**
 * @brief Defines the iSCSI R2T PDU header.
 */
#if BYTE_ORDER == LITTLE_ENDIAN
// The iSCSI R2T header format.
typedef struct {
    uint32_t opcode : 6;                 // DWORD 0
    uint32_t rsvd0 : 2;              // DWORD 0
    uint32_t rsvd1 : 7;              // DWORD 0
    uint32_t final : 1;              // DWORD 0
    uint32_t rsvd2 : 16;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    iscsi_lun_t lun;
    uint32_t itt;                    // DWORD 4
    uint32_t ttt;                    // DWORD 5
    uint32_t StatSN;                 // DWORD 6
    uint32_t ExpCmdSN;               // DWORD 7
    uint32_t MaxCmdSN;               // DWORD 8
    uint32_t R2TSN;                  // DWORD 9
    uint32_t bufferOffset;               // DWORD 10
    uint32_t desiredDataTransferLength;      // DWORD 11
} iscsi_r2t_hdr_t;
#else
// The iSCSI R2T header format.
typedef struct {
    uint32_t rsvd2 : 16;                 // DWORD 0
    uint32_t final : 1;              // DWORD 0
    uint32_t rsvd1 : 7;              // DWORD 0
    uint32_t rsvd0 : 2;              // DWORD 0
    uint32_t opcode : 6;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    iscsi_lun_t lun;
    uint32_t itt;                    // DWORD 4
    uint32_t ttt;                    // DWORD 5
    uint32_t StatSN;                 // DWORD 6
    uint32_t ExpCmdSN;               // DWORD 7
    uint32_t MaxCmdSN;               // DWORD 8
    uint32_t R2TSN;                  // DWORD 9
    uint32_t bufferOffset;               // DWORD 10
    uint32_t desiredDataTransferLength;      // DWORD 11
} iscsi_r2t_hdr_t;
#endif

/**
 * @brief Defines the iSCSI data-in PDU header.
 */
#if BYTE_ORDER == LITTLE_ENDIAN
// The iSCSI data in header format.
typedef struct {
    uint32_t opcode : 6;                 // DWORD 0
    uint32_t rsvd0 : 2;              // DWORD 0
    uint32_t S : 1;                  // DWORD 0
    uint32_t U : 1;                  // DWORD 0
    uint32_t O : 1;                  // DWORD 0
    uint32_t rsvd1 : 3;              // DWORD 0
    uint32_t A : 1;                  // DWORD 0
    uint32_t F : 1;                  // DWORD 0
    uint32_t rsvd2 : 8;              // DWORD 0
    uint32_t status : 8;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    iscsi_lun_t lun;
    uint32_t itt;                    // DWORD 4
    uint32_t ttt;                    // DWORD 5
    uint32_t statSN;                 // DWORD 6
    uint32_t expCmdSN;               // DWORD 7
    uint32_t maxCmdSN;               // DWORD 8
    uint32_t dataSN;                 // DWORD 9
    uint32_t bufferOffset;               // DWORD 10
    uint32_t residualCount;              // DWORD 11
} iscsi_data_in_hdr_t;
#else
// The iSCSI data in header format.
typedef struct {
    uint32_t status : 8;                 // DWORD 0
    uint32_t rsvd2 : 8;              // DWORD 0
    uint32_t F : 1;                  // DWORD 0
    uint32_t A : 1;                  // DWORD 0
    uint32_t rsvd1 : 3;              // DWORD 0
    uint32_t O : 1;                  // DWORD 0
    uint32_t U : 1;                  // DWORD 0
    uint32_t S : 1;                  // DWORD 0
    uint32_t rsvd0 : 2;              // DWORD 0
    uint32_t opcode : 6;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    iscsi_lun_t lun;
    uint32_t itt;                    // DWORD 4
    uint32_t ttt;                    // DWORD 5
    uint32_t statSN;                 // DWORD 6
    uint32_t expCmdSN;               // DWORD 7
    uint32_t maxCmdSN;               // DWORD 8
    uint32_t dataSN;                 // DWORD 9
    uint32_t bufferOffset;               // DWORD 10
    uint32_t residualCount;              // DWORD 11
} iscsi_data_in_hdr_t;
#endif

/**
 * @brief Defines the iSCSI data-out PDU header.
 */
#if BYTE_ORDER == LITTLE_ENDIAN
// The iSCSI data in header format.
typedef struct {
    uint32_t opcode : 6;                 // DWORD 0
    uint32_t rsvd0 : 2;              // DWORD 0
    uint32_t rsvd1 : 7;              // DWORD 0
    uint32_t final : 1;              // DWORD 0
    uint32_t rsvd2 : 16;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    iscsi_lun_t lun;
    uint32_t itt;                    // DWORD 4
    uint32_t ttt;                    // DWORD 5
    uint32_t rsvd3[1];               // DWORDS 6 to 6
    uint32_t exp_status_sn;              // DWORD 7
    uint32_t rsvd4[1];               // DWORDS 8 to 8
    uint32_t data_sn;                // DWORD 9
    uint32_t buffer_offset;              // DWORD 10
    uint32_t rsvd5[1];               // DWORDS 11 to 11
} iscsi_data_out_hdr_t;
#else
// The iSCSI data in header format.
typedef struct {
    uint32_t rsvd2 : 16;                 // DWORD 0
    uint32_t final : 1;              // DWORD 0
    uint32_t rsvd1 : 7;              // DWORD 0
    uint32_t rsvd0 : 2;              // DWORD 0
    uint32_t opcode : 6;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    iscsi_lun_t lun;
    uint32_t itt;                    // DWORD 4
    uint32_t ttt;                    // DWORD 5
    uint32_t rsvd3[1];               // DWORDS 6 to 6
    uint32_t exp_status_sn;              // DWORD 7
    uint32_t rsvd4[1];               // DWORDS 8 to 8
    uint32_t data_sn;                // DWORD 9
    uint32_t buffer_offset;              // DWORD 10
    uint32_t rsvd5[1];               // DWORDS 11 to 11
} iscsi_data_out_hdr_t;
#endif

/**
 * @brief Defines the iSCSI response PDU header.
 */
#if BYTE_ORDER == LITTLE_ENDIAN
// The iSCSI response header format.
typedef struct {
    uint32_t opcode : 6;                 // DWORD 0
    uint32_t rsvd0 : 2;              // DWORD 0
    uint32_t rsvd1 : 1;              // DWORD 0
    uint32_t underflow : 1;              // DWORD 0
    uint32_t overflow : 1;               // DWORD 0
    uint32_t bdUnderflow : 1;            // DWORD 0
    uint32_t bdOverflow : 1;             // DWORD 0
    uint32_t rsvd2 : 2;              // DWORD 0
    uint32_t final : 1;              // DWORD 0
    uint32_t response : 8;               // DWORD 0
    uint32_t status : 8;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    uint32_t rsvd3[1];               // DWORDS 2 to 2
    uint32_t rsvd4[1];               // DWORDS 3 to 3
    uint32_t itt;                    // DWORD 4
    uint32_t snackTag;               // DWORD 5
    uint32_t StatSN;                 // DWORD 6
    uint32_t ExpCmdSN;               // DWORD 7
    uint32_t MaxCmdSN;               // DWORD 8
    uint32_t ExpDataSN;              // DWORD 9
    uint32_t BidirReadResdiualCnt;           // DWORD 10
    uint32_t ResidualCnt;                // DWORD 11
} iscsi_response_hdr_t;
#else
// The iSCSI response header format.
typedef struct {
    uint32_t status : 8;                 // DWORD 0
    uint32_t response : 8;               // DWORD 0
    uint32_t final : 1;              // DWORD 0
    uint32_t rsvd2 : 2;              // DWORD 0
    uint32_t bdOverflow : 1;             // DWORD 0
    uint32_t bdUnderflow : 1;            // DWORD 0
    uint32_t overflow : 1;               // DWORD 0
    uint32_t underflow : 1;              // DWORD 0
    uint32_t rsvd1 : 1;              // DWORD 0
    uint32_t rsvd0 : 2;              // DWORD 0
    uint32_t opcode : 6;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    uint32_t rsvd3[1];               // DWORDS 2 to 2
    uint32_t rsvd4[1];               // DWORDS 3 to 3
    uint32_t itt;                    // DWORD 4
    uint32_t snackTag;               // DWORD 5
    uint32_t StatSN;                 // DWORD 6
    uint32_t ExpCmdSN;               // DWORD 7
    uint32_t MaxCmdSN;               // DWORD 8
    uint32_t ExpDataSN;              // DWORD 9
    uint32_t BidirReadResdiualCnt;           // DWORD 10
    uint32_t ResidualCnt;                // DWORD 11
} iscsi_response_hdr_t;
#endif

/**
 * @brief Defines the iSCSI header for the async PDU.
 */
#if BYTE_ORDER == LITTLE_ENDIAN
// The iSCSI target async header format.
typedef struct {
    uint32_t opcode : 6;                 // DWORD 0
    uint32_t rsvd0 : 2;              // DWORD 0
    uint32_t rsvd1 : 7;              // DWORD 0
    uint32_t final : 1;              // DWORD 0
    uint32_t rsvd2 : 16;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    iscsi_lun_t lun;
    uint32_t rsvd3[2];               // DWORDS 4 to 5
    uint32_t statSN;                 // DWORD 6
    uint32_t expCmdSN;               // DWORD 7
    uint32_t maxCmdSN;               // DWORD 8
    uint32_t async_event : 8;            // DWORD 9
    uint32_t async_vcode : 8;            // DWORD 9
    uint32_t param1 : 16;                // DWORD 9
    uint32_t param2 : 16;                // DWORD 10
    uint32_t param3 : 16;                // DWORD 10
    uint32_t rsvd4[1];               // DWORDS 11 to 11
} iscsi_async_hdr_t;
#else
// The iSCSI target async header format.
typedef struct {
    uint32_t rsvd2 : 16;                 // DWORD 0
    uint32_t final : 1;              // DWORD 0
    uint32_t rsvd1 : 7;              // DWORD 0
    uint32_t rsvd0 : 2;              // DWORD 0
    uint32_t opcode : 6;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    iscsi_lun_t lun;
    uint32_t rsvd3[2];               // DWORDS 4 to 5
    uint32_t statSN;                 // DWORD 6
    uint32_t expCmdSN;               // DWORD 7
    uint32_t maxCmdSN;               // DWORD 8
    uint32_t param1 : 16;                // DWORD 9
    uint32_t async_vcode : 8;            // DWORD 9
    uint32_t async_event : 8;            // DWORD 9
    uint32_t param3 : 16;                // DWORD 10
    uint32_t param2 : 16;                // DWORD 10
    uint32_t rsvd4[1];               // DWORDS 11 to 11
} iscsi_async_hdr_t;
#endif

/**
 * @brief Defines the iSCSI nop-out PDU header.
 */
#if BYTE_ORDER == LITTLE_ENDIAN
// The iSCSI target nop-out header format.
typedef struct {
    uint32_t opcode : 6;                 // DWORD 0
    uint32_t immediate : 1;              // DWORD 0
    uint32_t rsvd0 : 1;              // DWORD 0
    uint32_t rsvd1 : 7;              // DWORD 0
    uint32_t final : 1;              // DWORD 0
    uint32_t rsvd2 : 16;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    iscsi_lun_t lun;
    uint32_t itt;                    // DWORD 4
    uint32_t ttt;                    // DWORD 5
    uint32_t cmd_sn;                 // DWORD 6
    uint32_t exp_stat_sn;                // DWORD 7
    uint32_t rsvd3[1];               // DWORDS 8 to 8
    uint32_t rsvd4[1];               // DWORDS 9 to 9
    uint32_t rsvd5[1];               // DWORDS 10 to 10
    uint32_t rsvd6[1];               // DWORDS 11 to 11
} iscsi_nopout_hdr_t;
#else
// The iSCSI target nop-out header format.
typedef struct {
    uint32_t rsvd2 : 16;                 // DWORD 0
    uint32_t final : 1;              // DWORD 0
    uint32_t rsvd1 : 7;              // DWORD 0
    uint32_t rsvd0 : 1;              // DWORD 0
    uint32_t immediate : 1;              // DWORD 0
    uint32_t opcode : 6;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    iscsi_lun_t lun;
    uint32_t itt;                    // DWORD 4
    uint32_t ttt;                    // DWORD 5
    uint32_t cmd_sn;                 // DWORD 6
    uint32_t exp_stat_sn;                // DWORD 7
    uint32_t rsvd3[1];               // DWORDS 8 to 8
    uint32_t rsvd4[1];               // DWORDS 9 to 9
    uint32_t rsvd5[1];               // DWORDS 10 to 10
    uint32_t rsvd6[1];               // DWORDS 11 to 11
} iscsi_nopout_hdr_t;
#endif

/**
 * @brief Defines the iSCSI nop-in PDU header.
 */
#if BYTE_ORDER == LITTLE_ENDIAN
// The iSCSI target nop-in header format.
typedef struct {
    uint32_t opcode : 6;                 // DWORD 0
    uint32_t rsvd0 : 2;              // DWORD 0
    uint32_t rsvd1 : 7;              // DWORD 0
    uint32_t final : 1;              // DWORD 0
    uint32_t rsvd2 : 16;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    iscsi_lun_t lun;
    uint32_t itt;                    // DWORD 4
    uint32_t ttt;                    // DWORD 5
    uint32_t statSN;                 // DWORD 6
    uint32_t expCmdSN;               // DWORD 7
    uint32_t maxCmdSN;               // DWORD 8
    uint32_t rsvd3[1];               // DWORDS 9 to 9
    uint32_t rsvd4[1];               // DWORDS 10 to 10
    uint32_t rsvd5[1];               // DWORDS 11 to 11
} iscsi_nopin_hdr_t;
#else
// The iSCSI target nop-in header format.
typedef struct {
    uint32_t rsvd2 : 16;                 // DWORD 0
    uint32_t final : 1;              // DWORD 0
    uint32_t rsvd1 : 7;              // DWORD 0
    uint32_t rsvd0 : 2;              // DWORD 0
    uint32_t opcode : 6;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    iscsi_lun_t lun;
    uint32_t itt;                    // DWORD 4
    uint32_t ttt;                    // DWORD 5
    uint32_t statSN;                 // DWORD 6
    uint32_t expCmdSN;               // DWORD 7
    uint32_t maxCmdSN;               // DWORD 8
    uint32_t rsvd3[1];               // DWORDS 9 to 9
    uint32_t rsvd4[1];               // DWORDS 10 to 10
    uint32_t rsvd5[1];               // DWORDS 11 to 11
} iscsi_nopin_hdr_t;
#endif

/**
 * @brief Defines the iSCSI reject PDU header.
 */
#if BYTE_ORDER == LITTLE_ENDIAN
// The iSCSI target reject header format.
typedef struct {
    uint32_t opcode : 6;                 // DWORD 0
    uint32_t rsvd0 : 2;              // DWORD 0
    uint32_t rsvd1 : 7;              // DWORD 0
    uint32_t final : 1;              // DWORD 0
    uint32_t reason : 8;                 // DWORD 0
    uint32_t rsvd2 : 8;              // DWORD 0
    iscsi_hdr_dw2_t dw2;
    uint32_t rsvd3[1];               // DWORDS 2 to 2
    uint32_t rsvd4[1];               // DWORDS 3 to 3
    uint32_t itt;                    // DWORD 4
    uint32_t rsvd5[1];               // DWORDS 5 to 5
    uint32_t status_sn;              // DWORD 6
    uint32_t exp_cmd_sn;                 // DWORD 7
    uint32_t max_cmd_sn;                 // DWORD 8
    uint32_t data_r2t_sn;                // DWORD 9
    uint32_t rsvd6[1];               // DWORDS 10 to 10
    uint32_t rsvd7[1];               // DWORDS 11 to 11
} iscsi_reject_hdr_t;
#else
// The iSCSI target reject header format.
typedef struct {
    uint32_t rsvd2 : 8;              // DWORD 0
    uint32_t reason : 8;                 // DWORD 0
    uint32_t final : 1;              // DWORD 0
    uint32_t rsvd1 : 7;              // DWORD 0
    uint32_t rsvd0 : 2;              // DWORD 0
    uint32_t opcode : 6;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    uint32_t rsvd3[1];               // DWORDS 2 to 2
    uint32_t rsvd4[1];               // DWORDS 3 to 3
    uint32_t itt;                    // DWORD 4
    uint32_t rsvd5[1];               // DWORDS 5 to 5
    uint32_t status_sn;              // DWORD 6
    uint32_t exp_cmd_sn;                 // DWORD 7
    uint32_t max_cmd_sn;                 // DWORD 8
    uint32_t data_r2t_sn;                // DWORD 9
    uint32_t rsvd6[1];               // DWORDS 10 to 10
    uint32_t rsvd7[1];               // DWORDS 11 to 11
} iscsi_reject_hdr_t;
#endif

/**
 * @brief Defines the iSCSI task management PDU header.
 */
#if BYTE_ORDER == LITTLE_ENDIAN
// The iSCSI task mgmt cmd header format.
typedef struct {
    uint32_t opcode : 6;                 // DWORD 0
    uint32_t immediate : 1;              // DWORD 0
    uint32_t rsvd0 : 1;              // DWORD 0
    uint32_t function : 7;               // DWORD 0
    uint32_t final : 1;              // DWORD 0
    uint32_t rsvd1 : 16;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    iscsi_lun_t lun;
    uint32_t itt;                    // DWORD 4
    uint32_t ref_task_tag;               // DWORD 5
    uint32_t cmd_sn;                 // DWORD 6
    uint32_t exp_status_sn;              // DWORD 7
    uint32_t ref_cmd_sn;                 // DWORD 8
    uint32_t exp_data_sn;                // DWORD 9
    uint32_t rsvd2[1];               // DWORDS 10 to 10
    uint32_t rsvd3[1];               // DWORDS 11 to 11
} iscsi_task_mgmt_hdr_t;
#else
// The iSCSI task mgmt cmd header format.
typedef struct {
    uint32_t rsvd1 : 16;                 // DWORD 0
    uint32_t final : 1;              // DWORD 0
    uint32_t function : 7;               // DWORD 0
    uint32_t rsvd0 : 1;              // DWORD 0
    uint32_t immediate : 1;              // DWORD 0
    uint32_t opcode : 6;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    iscsi_lun_t lun;
    uint32_t itt;                    // DWORD 4
    uint32_t ref_task_tag;               // DWORD 5
    uint32_t cmd_sn;                 // DWORD 6
    uint32_t exp_status_sn;              // DWORD 7
    uint32_t ref_cmd_sn;                 // DWORD 8
    uint32_t exp_data_sn;                // DWORD 9
    uint32_t rsvd2[1];               // DWORDS 10 to 10
    uint32_t rsvd3[1];               // DWORDS 11 to 11
} iscsi_task_mgmt_hdr_t;
#endif

/**
 * @brief Defines the iSCSI task management response PDU header.
 */
#if BYTE_ORDER == LITTLE_ENDIAN
// The iSCSI TM response format.
typedef struct {
    uint32_t opcode : 6;                 // DWORD 0
    uint32_t rsvd0 : 2;              // DWORD 0
    uint32_t rsvd1 : 7;              // DWORD 0
    uint32_t final : 1;              // DWORD 0
    uint32_t response : 8;               // DWORD 0
    uint32_t rsvd2 : 8;              // DWORD 0
    iscsi_hdr_dw2_t dw2;
    uint32_t rsvd3[1];               // DWORDS 2 to 2
    uint32_t rsvd4[1];               // DWORDS 3 to 3
    uint32_t itt;                    // DWORD 4
    uint32_t rsvd5[1];               // DWORDS 5 to 5
    uint32_t StatSN;                 // DWORD 6
    uint32_t ExpCmdSN;               // DWORD 7
    uint32_t MaxCmdSN;               // DWORD 8
    uint32_t rsvd6[1];               // DWORDS 9 to 9
    uint32_t rsvd7[1];               // DWORDS 10 to 10
    uint32_t rsvd8[1];               // DWORDS 11 to 11
} iscsi_task_mgmt_response_t;
#else
// The iSCSI TM response format.
typedef struct {
    uint32_t rsvd2 : 8;              // DWORD 0
    uint32_t response : 8;               // DWORD 0
    uint32_t final : 1;              // DWORD 0
    uint32_t rsvd1 : 7;              // DWORD 0
    uint32_t rsvd0 : 2;              // DWORD 0
    uint32_t opcode : 6;                 // DWORD 0
    iscsi_hdr_dw2_t dw2;
    uint32_t rsvd3[1];               // DWORDS 2 to 2
    uint32_t rsvd4[1];               // DWORDS 3 to 3
    uint32_t itt;                    // DWORD 4
    uint32_t rsvd5[1];               // DWORDS 5 to 5
    uint32_t StatSN;                 // DWORD 6
    uint32_t ExpCmdSN;               // DWORD 7
    uint32_t MaxCmdSN;               // DWORD 8
    uint32_t rsvd6[1];               // DWORDS 9 to 9
    uint32_t rsvd7[1];               // DWORDS 10 to 10
    uint32_t rsvd8[1];               // DWORDS 11 to 11
} iscsi_task_mgmt_response_t;
#endif

#endif /* !_OCS_ISCSI_SPEC_H */

/* vim: set noexpandtab textwidth=120: */