/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2000 by Cisco Systems, Inc.  All rights reserved.
 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright 2014-2015 Nexenta Systems, Inc.  All rights reserved.
 */

#ifndef _ISCSI_H
#define _ISCSI_H

/*
 * Block comment which describes the contents of this file.
 */

#ifdef __cplusplus
extern "C" {
#endif

#include <sys/scsi/scsi.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/socket.h>
#include <sys/kstat.h>
#include <sys/sunddi.h>
#include <sys/sunmdi.h>
#include <sys/mdi_impldefs.h>
#include <sys/time.h>
#include <sys/nvpair.h>
#include <sys/sdt.h>

#include <sys/iscsi_protocol.h>
#include <sys/scsi/adapters/iscsi_if.h>
#include <iscsiAuthClient.h>
#include <iscsi_stats.h>
#include <iscsi_thread.h>
#include <sys/idm/idm.h>
#include <sys/idm/idm_conn_sm.h>
#include <nvfile.h>
#include <inet/ip.h>

#ifndef MIN
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif

#ifndef TRUE
#define TRUE 1
#endif

#ifndef FALSE
#define FALSE 0
#endif

#define LOGIN_PDU_BUFFER_SIZE   (16 * 1024)     /* move somewhere else */

extern boolean_t iscsi_conn_logging;
extern boolean_t iscsi_io_logging;
extern boolean_t iscsi_login_logging;
extern boolean_t iscsi_logging;
extern boolean_t iscsi_sess_logging;
#define ISCSI_CONN_LOG  if (iscsi_conn_logging) cmn_err
#define ISCSI_IO_LOG    if (iscsi_io_logging) cmn_err
#define ISCSI_LOGIN_LOG if (iscsi_login_logging) cmn_err
#define ISCSI_LOG       if (iscsi_logging) cmn_err
#define ISCSI_SESS_LOG  if (iscsi_sess_logging) cmn_err

/*
 * Name Format of the different Task Queues
 */
#define ISCSI_SESS_IOTH_NAME_FORMAT             "io_thrd_%d.%d"
#define ISCSI_SESS_WD_NAME_FORMAT               "wd_thrd_%d.%d"
#define ISCSI_SESS_LOGIN_TASKQ_NAME_FORMAT      "login_taskq_%d.%d"
#define ISCSI_SESS_ENUM_TASKQ_NAME_FORMAT       "enum_taskq_%d.%d"
#define ISCSI_CONN_CN_TASKQ_NAME_FORMAT         "conn_cn_taskq_%d.%d.%d"
#define ISCSI_CONN_RXTH_NAME_FORMAT             "rx_thrd_%d.%d.%d"
#define ISCSI_CONN_TXTH_NAME_FORMAT             "tx_thrd_%d.%d.%d"

/*
 * The iSCSI driver will not build scatter/gather lists (iovec) longer
 * than the value defined here. Asserts have been include in the code
 * to check.
 */
#define ISCSI_MAX_IOVEC         5

#define ISCSI_DEFAULT_MAX_STORM_DELAY           32

/*
 * The SNDBUF and RCVBUF size parameters for the sockets are just a
 * guess for the time being (I think it is the values used by CISCO
 * or UNH).  Testing will have to be done to figure * out the impact
 * of these values on performance.
 */
#define ISCSI_SOCKET_SNDBUF_SIZE                (256 * 1024)
#define ISCSI_SOCKET_RCVBUF_SIZE                (256 * 1024)
#define ISCSI_TCP_NODELAY_DEFAULT               0
#define ISCSI_TCP_CNOTIFY_THRESHOLD_DEFAULT     2000
#define ISCSI_TCP_CABORT_THRESHOLD_DEFAULT      10000
#define ISCSI_TCP_ABORT_THRESHOLD_DEFAULT       (30 * 1000) /* milliseconds */
#define ISNS_TCP_ABORT_THRESHOLD_DEFAULT        (3 * 1000) /* milliseconds */

/* Default values for tunable parameters */
#define ISCSI_DEFAULT_RX_TIMEOUT_VALUE          60
#define ISCSI_DEFAULT_CONN_DEFAULT_LOGIN_MAX    180
#define ISCSI_DEFAULT_LOGIN_POLLING_DELAY       60

/*
 * Convenient short hand defines
 */
#define TARGET_PROP     "target"
#define LUN_PROP        "lun"
#define MDI_GUID        "wwn"
#define NDI_GUID        "client-guid"

#define ISCSI_SIG_CMD   0x11111111
#define ISCSI_SIG_LUN   0x22222222
#define ISCSI_SIG_CONN  0x33333333
#define ISCSI_SIG_SESS  0x44444444
#define ISCSI_SIG_HBA   0x55555555

#define SENDTARGETS_DISCOVERY   "SENDTARGETS_DISCOVERY"

#define ISCSI_LUN_MASK_MSB      0x00003f00
#define ISCSI_LUN_MASK_LSB      0x000000ff
#define ISCSI_LUN_MASK          (ISCSI_LUN_MASK_MSB | ISCSI_LUN_MASK_LSB)
#define ISCSI_LUN_BYTE_COPY(lun, report_lun_data) \
        lun[0] = (report_lun_data & ISCSI_LUN_MASK_MSB) >> 8; \
        lun[1] = (report_lun_data & ISCSI_LUN_MASK_LSB);
/*
 * Not defined by iSCSI, but used in the login code to
 * determine when to send the initial Login PDU
 */
#define ISCSI_INITIAL_LOGIN_STAGE       -1

typedef enum iscsi_status {
        /* Success */
        ISCSI_STATUS_SUCCESS = 0,
        /* Driver / Kernel / Code error */
        ISCSI_STATUS_INTERNAL_ERROR,
        /* ITT table is already full, unable to reserve slot */
        ISCSI_STATUS_ITT_TABLE_FULL,
        /* Login on connection failed */
        ISCSI_STATUS_LOGIN_FAILED,
        /* No connections are in the LOGGED_IN state */
        ISCSI_STATUS_NO_CONN_LOGGED_IN,
        /* TCP Transfer Error */
        ISCSI_STATUS_TCP_TX_ERROR,
        /* TCP Receive Error */
        ISCSI_STATUS_TCP_RX_ERROR,
        /* iSCSI packet RCV timeout */
        ISCSI_STATUS_RX_TIMEOUT,
        /* iSCSI Header Digest CRC error */
        ISCSI_STATUS_HEADER_DIGEST_ERROR,
        /* iSCSI Data Digest CRC error */
        ISCSI_STATUS_DATA_DIGEST_ERROR,
        /* kmem_alloc failure */
        ISCSI_STATUS_ALLOC_FAILURE,
        /* cmd (tran_abort/reset) failed */
        ISCSI_STATUS_CMD_FAILED,
        /* iSCSI protocol error */
        ISCSI_STATUS_PROTOCOL_ERROR,
        /* iSCSI protocol version mismatch */
        ISCSI_STATUS_VERSION_MISMATCH,
        /* iSCSI login negotiation failed */
        ISCSI_STATUS_NEGO_FAIL,
        /* iSCSI login authentication failed */
        ISCSI_STATUS_AUTHENTICATION_FAILED,
        /* iSCSI login redirection failed */
        ISCSI_STATUS_REDIRECTION_FAILED,
        /* iSCSI uscsi status failure */
        ISCSI_STATUS_USCSI_FAILED,
        /* data received would have overflowed given buffer */
        ISCSI_STATUS_DATA_OVERFLOW,
        /* session/connection needs to shutdown */
        ISCSI_STATUS_SHUTDOWN,
        /* logical unit in use */
        ISCSI_STATUS_BUSY,
        /* Login on connection failed, retries exceeded */
        ISCSI_STATUS_LOGIN_TIMED_OUT,
        /* iSCSI login tpgt negotiation failed */
        ISCSI_STATUS_LOGIN_TPGT_NEGO_FAIL
} iscsi_status_t;
#define ISCSI_SUCCESS(status) (status == ISCSI_STATUS_SUCCESS)

/* SNA32 check value used on increment of CmdSn values */
#define ISCSI_SNA32_CHECK 2147483648UL /* 2**31 */

/*
 * This is the maximum number of commands that can be outstanding
 * on a iSCSI session at anyone point in time.
 */
#define ISCSI_CMD_TABLE_SIZE            1024

/* Used on connections thread create of receiver thread */
extern pri_t minclsyspri;

/*
 * Callers of iscsid_config_one/all must hold this
 * semaphore across the calls.  Otherwise a ndi_devi_enter()
 * deadlock in the DDI layer may occur.
 */
extern ksema_t iscsid_config_semaphore;

extern kmutex_t iscsi_oid_mutex;
extern uint32_t iscsi_oid;
extern void *iscsi_state;

/*
 * NOP delay is used to send a iSCSI NOP (ie. ping) across the
 * wire to see if the target is still alive.  NOPs are only
 * sent when the RX thread hasn't received anything for the
 * below amount of time.
 */
#define ISCSI_DEFAULT_NOP_DELAY                 5 /* seconds */
extern int      iscsi_nop_delay;
/*
 * If we haven't received anything in a specified period of time
 * we will stop accepting IO via tran start.  This will enable
 * upper level drivers to see we might be having a problem and
 * in the case of scsi_vhci will start to route IO down a better
 * path.
 */
#define ISCSI_DEFAULT_RX_WINDOW                 20 /* seconds */
extern int      iscsi_rx_window;
/*
 * If we haven't received anything in a specified period of time
 * we will stop accepting IO via tran start.  This the max limit
 * when encountered we will start returning a fatal error.
 */
#define ISCSI_DEFAULT_RX_MAX_WINDOW             180 /* seconds */
extern int      iscsi_rx_max_window;

/*
 * During iscsi boot, if the boot session has been created, the
 * initiator hasn't changed the boot lun to be online, we will wait
 * 180s here for lun online by default.
 */
#define ISCSI_BOOT_DEFAULT_MAX_DELAY            180 /* seconds */
/*
 * +--------------------------------------------------------------------+
 * | iSCSI Driver Structures                                            |
 * +--------------------------------------------------------------------+
 */

/*
 * iSCSI Auth Information
 */
typedef struct iscsi_auth {
        IscsiAuthStringBlock    auth_recv_string_block;
        IscsiAuthStringBlock    auth_send_string_block;
        IscsiAuthLargeBinary    auth_recv_binary_block;
        IscsiAuthLargeBinary    auth_send_binary_block;
        IscsiAuthClient         auth_client_block;
        int                     num_auth_buffers;
        IscsiAuthBufferDesc     auth_buffers[5];

        /*
         * To indicate if bi-directional authentication is enabled.
         * 0 means uni-directional authentication.
         * 1 means bi-directional authentication.
         */
        int                     bidirectional_auth;

        /* Initiator's authentication information. */
        char                    username[iscsiAuthStringMaxLength];
        uint8_t                 password[iscsiAuthStringMaxLength];
        int                     password_length;

        /* Target's authentication information. */
        char                    username_in[iscsiAuthStringMaxLength];
        uint8_t                 password_in[iscsiAuthStringMaxLength];
        int                     password_length_in;
} iscsi_auth_t;

/*
 * iSCSI Task
 */
typedef struct iscsi_task {
        void                    *t_arg;
        boolean_t               t_blocking;
        uint32_t                t_event_count;
} iscsi_task_t;

/*
 * These are all the iscsi_cmd types that we use to track our
 * commands between queues and actions.
 */
typedef enum iscsi_cmd_type {
        ISCSI_CMD_TYPE_SCSI = 1,        /* scsi cmd */
        ISCSI_CMD_TYPE_NOP,             /* nop / ping */
        ISCSI_CMD_TYPE_ABORT,           /* abort */
        ISCSI_CMD_TYPE_RESET,           /* reset */
        ISCSI_CMD_TYPE_LOGOUT,          /* logout */
        ISCSI_CMD_TYPE_LOGIN,           /* login */
        ISCSI_CMD_TYPE_TEXT             /* text */
} iscsi_cmd_type_t;

/*
 * iscsi_cmd_state - (reference iscsi_cmd.c for state diagram)
 */
typedef enum iscsi_cmd_state {
        ISCSI_CMD_STATE_FREE = 0,
        ISCSI_CMD_STATE_PENDING,
        ISCSI_CMD_STATE_ACTIVE,
        ISCSI_CMD_STATE_ABORTING,
        ISCSI_CMD_STATE_IDM_ABORTING,
        ISCSI_CMD_STATE_COMPLETED,
        ISCSI_CMD_STATE_MAX
} iscsi_cmd_state_t;

#ifdef ISCSI_CMD_SM_STRINGS
static const char *iscsi_cmd_state_names[ISCSI_CMD_STATE_MAX+1] = {
        "ISCSI_CMD_STATE_FREE",
        "ISCSI_CMD_STATE_PENDING",
        "ISCSI_CMD_STATE_ACTIVE",
        "ISCSI_CMD_STATE_ABORTING",
        "ISCSI_CMD_STATE_IDM_ABORTING",
        "ISCSI_CMD_STATE_COMPLETED",
        "ISCSI_CMD_STATE_MAX"
};
#endif

/*
 * iscsi command events
 */
typedef enum iscsi_cmd_event {
        ISCSI_CMD_EVENT_E1 = 0,
        ISCSI_CMD_EVENT_E2,
        ISCSI_CMD_EVENT_E3,
        ISCSI_CMD_EVENT_E4,
        ISCSI_CMD_EVENT_E6,
        ISCSI_CMD_EVENT_E7,
        ISCSI_CMD_EVENT_E8,
        ISCSI_CMD_EVENT_E9,
        ISCSI_CMD_EVENT_E10,
        ISCSI_CMD_EVENT_MAX
} iscsi_cmd_event_t;

#ifdef ISCSI_CMD_SM_STRINGS
static const char *iscsi_cmd_event_names[ISCSI_CMD_EVENT_MAX+1] = {
        "ISCSI_CMD_EVENT_E1",
        "ISCSI_CMD_EVENT_E2",
        "ISCSI_CMD_EVENT_E3",
        "ISCSI_CMD_EVENT_E4",
        "ISCSI_CMD_EVENT_E6",
        "ISCSI_CMD_EVENT_E7",
        "ISCSI_CMD_EVENT_E8",
        "ISCSI_CMD_EVENT_E9",
        "ISCSI_CMD_EVENT_E10",
        "ISCSI_CMD_EVENT_MAX"
};
#endif

/*
 * iscsi text command stages - these stages are used by iSCSI text
 * processing to manage long resonses.
 */
typedef enum iscsi_cmd_text_stage {
        ISCSI_CMD_TEXT_INITIAL_REQ = 0,
        ISCSI_CMD_TEXT_CONTINUATION,
        ISCSI_CMD_TEXT_FINAL_RSP
} iscsi_cmd_text_stage_t;

/*
 * iscsi cmd misc flags - bitwise applicable
 */
#define ISCSI_CMD_MISCFLAG_INTERNAL     0x1
#define ISCSI_CMD_MISCFLAG_FREE         0x2
#define ISCSI_CMD_MISCFLAG_STUCK        0x4
#define ISCSI_CMD_MISCFLAG_XARQ         0x8
#define ISCSI_CMD_MISCFLAG_SENT         0x10
#define ISCSI_CMD_MISCFLAG_FLUSH        0x20

/*
 * 1/2 of a 32 bit number, used for checking CmdSN
 * wrapped.
 */
#define ISCSI_CMD_SN_WRAP               0x80000000

#define ISCSI_CMD_PKT_STAT_INIT         0

/*
 * iSCSI cmd/pkt Structure
 */
typedef struct iscsi_cmd {
        uint32_t                cmd_sig;
        struct iscsi_cmd        *cmd_prev;
        struct iscsi_cmd        *cmd_next;
        struct iscsi_conn       *cmd_conn;

        iscsi_cmd_type_t        cmd_type;
        iscsi_cmd_state_t       cmd_state;
        iscsi_cmd_state_t       cmd_prev_state;
        clock_t                 cmd_lbolt_pending;
        clock_t                 cmd_lbolt_active;
        clock_t                 cmd_lbolt_aborting;
        clock_t                 cmd_lbolt_idm_aborting;
        clock_t                 cmd_lbolt_timeout;
        uint8_t                 cmd_misc_flags;
        idm_task_t              *cmd_itp;

        union {
                /* ISCSI_CMD_TYPE_SCSI */
                struct {
                        idm_buf_t               *ibp_ibuf;
                        idm_buf_t               *ibp_obuf;
                        struct scsi_pkt         *pkt;
                        struct buf              *bp;
                        int                     cmdlen;
                        int                     statuslen;
                        size_t                  data_transferred;

                        uint32_t                lun;

                        /*
                         * If SCSI_CMD_TYPE is in ABORTING_STATE
                         * then the abort_icmdp field will be a pointer
                         * to the abort command chasing this one.
                         */
                        struct iscsi_cmd        *abort_icmdp;
                        /*
                         * pointer to the r2t associated with this
                         * command (if any)
                         */
                        struct iscsi_cmd        *r2t_icmdp;
                        /*
                         * It will be true if this command has
                         * another R2T to handle.
                         */
                        boolean_t               r2t_more;
                        /*
                         * It is used to record pkt_statistics temporarily.
                         */
                        uint_t                  pkt_stat;
                } scsi;
                /* ISCSI_CMD_TYPE_ABORT */
                struct {
                        /* pointer to original iscsi_cmd, for abort */
                        struct iscsi_cmd        *icmdp;
                } abort;
                /* ISCSI_CMD_TYPE_RESET */
                struct {
                        int                     level;
                        uint8_t                 response;
                } reset;
                /* ISCSI_CMD_TYPE_NOP */
                struct {
                        int rsvd;
                } nop;
                /* ISCSI_CMD_TYPE_R2T */
                struct {
                        struct iscsi_cmd        *icmdp;
                        uint32_t                offset;
                        uint32_t                length;
                } r2t;
                /* ISCSI_CMD_TYPE_LOGIN */
                struct {
                        int rvsd;
                } login;
                /* ISCSI_CMD_TYPE_LOGOUT */
                struct {
                        int rsvd;
                } logout;
                /* ISCSI_CMD_TYPE_TEXT */
                struct {
                        char                    *buf;
                        int                     buf_len;
                        uint32_t                offset;
                        uint32_t                data_len;
                        uint32_t                total_rx_len;
                        uint32_t                ttt;
                        uint8_t                 lun[8];
                        iscsi_cmd_text_stage_t  stage;
                } text;
        } cmd_un;

        struct iscsi_lun        *cmd_lun; /* associated lun */

        uint32_t                cmd_itt;
        uint32_t                cmd_ttt;

        /*
         * If a data digest error is seem on a data pdu.  This flag
         * will get set.  We don't abort the cmd immediately because
         * we want to read in all the data to get it out of the
         * stream.  Once the completion for the cmd is received we
         * we will abort the cmd and state no sense data was available.
         */
        boolean_t               cmd_crc_error_seen;

        /*
         * Used to block and wake up caller until action is completed.
         * This is for ABORT, RESET, and PASSTHRU cmds.
         */
        int                     cmd_result;
        int                     cmd_completed;
        kmutex_t                cmd_mutex;
        kcondvar_t              cmd_completion;

        idm_pdu_t               cmd_pdu;

        sm_audit_buf_t          cmd_state_audit;

        uint32_t                cmd_sn;
} iscsi_cmd_t;


/*
 * iSCSI LUN Structure
 */
typedef struct iscsi_lun {
        uint32_t                lun_sig;
        int                     lun_state;

        struct iscsi_lun        *lun_next;      /* next lun on this sess. */
        struct iscsi_sess       *lun_sess;      /* parent sess. for lun */
        dev_info_t              *lun_dip;
        mdi_pathinfo_t          *lun_pip;

        uint16_t                lun_num;        /* LUN */
        uint8_t                 lun_addr_type;  /* LUN addressing type */
        uint32_t                lun_oid;        /* OID */
        char                    *lun_guid;      /* GUID */
        int                     lun_guid_size;  /* GUID allocation size */
        char                    *lun_addr;      /* sess,lun */
        time_t                  lun_time_online;

        uchar_t                 lun_cap;        /* bitmap of scsi caps */

        uchar_t                 lun_vid[ISCSI_INQ_VID_BUF_LEN]; /* Vendor ID */
        uchar_t                 lun_pid[ISCSI_INQ_PID_BUF_LEN]; /* Product ID */

        uchar_t                 lun_type;
        kmutex_t                lun_mutex;
        int                     lun_refcnt;
} iscsi_lun_t;

#define ISCSI_LUN_STATE_CLEAR       0           /* used to clear all states */
#define ISCSI_LUN_STATE_OFFLINE     1
#define ISCSI_LUN_STATE_ONLINE      2
#define ISCSI_LUN_STATE_INVALID     4           /* offline failed */
#define ISCSI_LUN_STATE_BUSY        8           /* logic unit is in reset */

#define ISCSI_LUN_CAP_RESET         0x01

#define ISCSI_SCSI_RESET_SENSE_CODE 0x29
#define ISCSI_SCSI_LUNCHANGED_CODE      0x3f

#define ISCSI_SCSI_LUNCHANGED_ASCQ      0x0e

/*
 *
 *
 */
typedef struct iscsi_queue {
        iscsi_cmd_t     *head;
        iscsi_cmd_t     *tail;
        int             count;
        kmutex_t        mutex;
} iscsi_queue_t;

#define ISCSI_CONN_DEFAULT_LOGIN_MIN            0
#define ISCSI_CONN_DEFAULT_LOGIN_REDIRECT       10

/* iSCSI tunable Parameters */
typedef struct iscsi_tunable_params {
        int             recv_login_rsp_timeout; /* range: 0 - 60*60 */
        int             conn_login_max;         /* range: 0 - 60*60 */
        int             polling_login_delay;    /* range: 0 - 60*60 */
} iscsi_tunable_params_t;

typedef union iscsi_sockaddr {
        struct sockaddr         sin;
        struct sockaddr_in      sin4;
        struct sockaddr_in6     sin6;
} iscsi_sockaddr_t;

#define SIZEOF_SOCKADDR(so)     ((so)->sa_family == AF_INET ? \
        sizeof (struct sockaddr_in) : sizeof (struct sockaddr_in6))

typedef enum {
        LOGIN_START,
        LOGIN_READY,
        LOGIN_TX,
        LOGIN_RX,
        LOGIN_ERROR,
        LOGIN_DONE,
        LOGIN_FFP,
        LOGIN_MAX
} iscsi_login_state_t;

#ifdef ISCSI_LOGIN_STATE_NAMES
static const char *iscsi_login_state_names[LOGIN_MAX+1] = {
        "LOGIN_START",
        "LOGIN_READY",
        "LOGIN_TX",
        "LOGIN_RX",
        "LOGIN_ERROR",
        "LOGIN_DONE",
        "LOGIN_FFP",
        "LOGIN_MAX"
};
#endif

/*
 * iscsi_conn_state
 */
typedef enum iscsi_conn_state {
        ISCSI_CONN_STATE_UNDEFINED = 0,
        ISCSI_CONN_STATE_FREE,
        ISCSI_CONN_STATE_IN_LOGIN,
        ISCSI_CONN_STATE_LOGGED_IN,
        ISCSI_CONN_STATE_IN_LOGOUT,
        ISCSI_CONN_STATE_FAILED,
        ISCSI_CONN_STATE_POLLING,
        ISCSI_CONN_STATE_MAX
} iscsi_conn_state_t;

#ifdef ISCSI_ICS_NAMES
static const char *iscsi_ics_name[ISCSI_CONN_STATE_MAX+1] = {
        "ISCSI_CONN_STATE_UNDEFINED",
        "ISCSI_CONN_STATE_FREE",
        "ISCSI_CONN_STATE_IN_LOGIN",
        "ISCSI_CONN_STATE_LOGGED_IN",
        "ISCSI_CONN_STATE_IN_LOGOUT",
        "ISCSI_CONN_STATE_FAILED",
        "ISCSI_CONN_STATE_POLLING",
        "ISCSI_CONN_STATE_MAX"
};
#endif

#define ISCSI_CONN_STATE_FULL_FEATURE(state) \
        ((state == ISCSI_CONN_STATE_LOGGED_IN) || \
        (state == ISCSI_CONN_STATE_IN_LOGOUT))

/*
 * iSCSI Connection Structure
 */
typedef struct iscsi_conn {
        uint32_t                conn_sig;
        struct iscsi_conn       *conn_next;     /* next conn on this sess. */
        struct iscsi_sess       *conn_sess;     /* parent sess. for conn. */

        iscsi_conn_state_t      conn_state;     /* cur. conn. driver state */
        iscsi_conn_state_t      conn_prev_state; /* prev. conn. driver state */
        /* protects the session state and synchronizes the state machine */
        kmutex_t                conn_state_mutex;
        kcondvar_t              conn_state_change;
        boolean_t               conn_state_destroy;
        boolean_t               conn_state_ffp;
        boolean_t               conn_state_idm_connected;
        boolean_t               conn_async_logout;
        ddi_taskq_t             *conn_cn_taskq;

        idm_conn_t              *conn_ic;

        /* base connection information, may have been redirected */
        iscsi_sockaddr_t        conn_base_addr;

        /* current connection information, may have been redirected */
        iscsi_sockaddr_t        conn_curr_addr;

        boolean_t               conn_bound;
        iscsi_sockaddr_t        conn_bound_addr;

        uint32_t                conn_cid;       /* CID */
        uint32_t                conn_oid;       /* OID */

        int                     conn_current_stage;     /* iSCSI login stage */
        int                     conn_next_stage;        /* iSCSI login stage */
        int                     conn_partial_response;

        /*
         * The active queue contains iscsi_cmds that have already
         * been sent on this connection.  Any future responses to
         * these cmds require alligence to this connection.  If there
         * are issues with these cmds the command may need aborted
         * depending on the command type, and must be put back into
         * the session's pending queue or aborted.
         */
        iscsi_queue_t           conn_queue_active;
        iscsi_queue_t           conn_queue_idm_aborting;

        /* lbolt from the last receive, used for nop processing */
        clock_t                 conn_rx_lbolt;
        clock_t                 conn_nop_lbolt;

        iscsi_thread_t          *conn_tx_thread;

        /*
         * The expstatsn is the command status sn that is expected
         * next from the target.  Command status is carried on a number
         * of iSCSI PDUs (ex.  SCSI Cmd Response, SCSI Data IN with
         * S-Bit set, ...), not all PDUs.  If our expstatsn is different
         * than the received statsn.  Something got out of sync we need to
         * recover.
         */
        uint32_t                conn_expstatsn;
        uint32_t                conn_laststatsn;

        /* active login parameters */
        iscsi_login_params_t    conn_params;

        /* Statistics */
        struct {
                kstat_t                 *ks;
                iscsi_conn_stats_t      ks_data;
        } stats;

        /*
         * These fields are used to coordinate the asynchronous IDM
         * PDU operations with the synchronous login code.
         */
        kmutex_t                conn_login_mutex;
        kcondvar_t              conn_login_cv;
        iscsi_login_state_t     conn_login_state;
        iscsi_status_t          conn_login_status;
        iscsi_hdr_t             conn_login_resp_hdr;
        char                    *conn_login_data;
        int                     conn_login_datalen;
        int                     conn_login_max_data_length;

        /*
         * login min and max identify the amount of time
         * in lbolt that iscsi_start_login() should attempt
         * to log into a target portal.  The login will
         * delay until the min lbolt has been reached and
         * will end once max time has been reached.  These
         * values are normally set to the default but can
         * are also altered by async commands received from
         * the targetlogin.
         */
        clock_t                 conn_login_min;
        clock_t                 conn_login_max;
        sm_audit_buf_t          conn_state_audit;

        /* active tunable parameters */
        iscsi_tunable_params_t  conn_tunable_params;
        boolean_t               conn_timeout;
} iscsi_conn_t;


/*
 * iscsi_sess_state - (reference iscsi_sess.c for state diagram)
 */
typedef enum iscsi_sess_state {
        ISCSI_SESS_STATE_FREE = 0,
        ISCSI_SESS_STATE_LOGGED_IN,
        ISCSI_SESS_STATE_FAILED,
        ISCSI_SESS_STATE_IN_FLUSH,
        ISCSI_SESS_STATE_FLUSHED,
        ISCSI_SESS_STATE_MAX
} iscsi_sess_state_t;

#ifdef ISCSI_SESS_SM_STRINGS
static const char *iscsi_sess_state_names[ISCSI_SESS_STATE_MAX+1] = {
        "ISCSI_SESS_STATE_FREE",
        "ISCSI_SESS_STATE_LOGGED_IN",
        "ISCSI_SESS_STATE_FAILED",
        "ISCSI_SESS_STATE_IN_FLUSH",
        "ISCSI_SESS_STATE_FLUSHED",
        "ISCSI_SESS_STATE_MAX"
};
#endif

#define ISCSI_SESS_STATE_FULL_FEATURE(state) \
        ((state == ISCSI_SESS_STATE_LOGGED_IN) || \
        (state == ISCSI_SESS_STATE_IN_FLUSH))


typedef enum iscsi_sess_event {
        ISCSI_SESS_EVENT_N1 = 0,
        ISCSI_SESS_EVENT_N3,
        ISCSI_SESS_EVENT_N5,
        ISCSI_SESS_EVENT_N6,
        ISCSI_SESS_EVENT_N7,
        ISCSI_SESS_EVENT_MAX
} iscsi_sess_event_t;

#ifdef ISCSI_SESS_SM_STRINGS
static const char *iscsi_sess_event_names[ISCSI_SESS_EVENT_MAX+1] = {
        "ISCSI_SESS_EVENT_N1",
        "ISCSI_SESS_EVENT_N3",
        "ISCSI_SESS_EVENT_N5",
        "ISCSI_SESS_EVENT_N6",
        "ISCSI_SESS_EVENT_N7",
        "ISCSI_SESS_EVENT_MAX"
};
#endif

typedef enum iscsi_sess_type {
        ISCSI_SESS_TYPE_NORMAL = 0,
        ISCSI_SESS_TYPE_DISCOVERY
} iscsi_sess_type_t;

#define SESS_ABORT_TASK_MAX_THREADS     1

/* Sun's initiator session ID */
#define ISCSI_SUN_ISID_0    0x40    /* ISID - EN format */
#define ISCSI_SUN_ISID_1    0x00    /* Sec B */
#define ISCSI_SUN_ISID_2    0x00    /* Sec B */
#define ISCSI_SUN_ISID_3    0x2A    /* Sec C - 42 = Sun's EN */
/*
 * defines 4-5 are the reserved values.  These reserved values
 * are used as the ISID for an initiator-port in MP-API and used
 * for the send targets discovery sessions.  Byte 5 is overridden
 * for full feature sessions.  The default values of byte 5 for a
 * full feature session is 0.  When MS/T is enabled with more than
 * one session this byte 5 will increment > 0 up to
 * ISCSI_MAX_CONFIG_SESSIONS.
 */
#define ISCSI_SUN_ISID_4    0x00
#define ISCSI_SUN_ISID_5    0xFF

#define ISCSI_DEFAULT_SESS_BOUND        B_FALSE
#define ISCSI_DEFAULT_SESS_NUM          1

typedef enum iscsi_enum_status {
        ISCSI_SESS_ENUM_FREE            =       0,
        ISCSI_SESS_ENUM_INPROG,
        ISCSI_SESS_ENUM_DONE
} iscsi_enum_status_t;

typedef enum iscsi_enum_result {
        ISCSI_SESS_ENUM_COMPLETE        =       0,
        ISCSI_SESS_ENUM_PARTIAL,
        ISCSI_SESS_ENUM_IOFAIL,
        ISCSI_SESS_ENUM_SUBMITTED,
        ISCSI_SESS_ENUM_SUBFAIL,
        ISCSI_SESS_ENUM_GONE,
        ISCSI_SESS_ENUM_TUR_FAIL
} iscsi_enum_result_t;

/*
 * iSCSI Session(Target) Structure
 */
typedef struct iscsi_sess {
        uint32_t                sess_sig;

        iscsi_sess_state_t      sess_state;
        iscsi_sess_state_t      sess_prev_state;
        clock_t                 sess_state_lbolt;
        /* protects the session state and synchronizes the state machine */
        krwlock_t               sess_state_rwlock;

        /*
         * Associated target OID.
         */
        uint32_t                sess_target_oid;

        /*
         * Session OID.  Used by IMA, interfaces and exported as
         * TARGET_PROP which is checked by the NDI.  In addition
         * this is used in our tran_lun_init function.
         */
        uint32_t                sess_oid;

        struct iscsi_sess       *sess_next;
        struct iscsi_hba        *sess_hba;

        /* list of all luns relating to session */
        struct iscsi_lun        *sess_lun_list;
        krwlock_t               sess_lun_list_rwlock;

        /* list of all connections relating to session */
        struct iscsi_conn       *sess_conn_list;
        struct iscsi_conn       *sess_conn_list_last_ptr;
        /* pointer to active connection in session */
        struct iscsi_conn       *sess_conn_act;
        krwlock_t               sess_conn_list_rwlock;

        /* Connection ID for next connection to be added to session */
        uint32_t                sess_conn_next_cid;

        /*
         * last time any connection on this session received
         * data from the target.
         */
        clock_t                 sess_rx_lbolt;

        clock_t                 sess_failure_lbolt;

        int                     sess_storm_delay;

        /*
         * sess_cmdsn_mutex protects the cmdsn and itt table/values
         * Cmdsn isn't that big of a problem yet since we only have
         * one connection but in the future we will need to ensure
         * this locking is working so keep the sequence numbers in
         * sync on the wire.
         *
         * We also use this lock to protect the ITT table and it's
         * values.  We need to make sure someone doesn't assign
         * a duplicate ITT value or cell to a command.  Also we
         * need to make sure when someone is looking up an ITT
         * that the command is still in that correct queue location.
         */
        kmutex_t                sess_cmdsn_mutex;

        /*
         * iSCSI command sequencing / windowing.  The next
         * command to be sent via the pending queue will
         * get the sess_cmdsn.  If the maxcmdsn is less
         * than the next cmdsn then the iSCSI window is
         * closed and this command cannot be sent yet.
         * Most iscsi cmd responses from the target carry
         * a new maxcmdsn.  If this new maxcmdsn is greater
         * than the sess_maxcmdsn we will update it's value
         * and set a timer to fire in one tick and reprocess
         * the pending queue.
         *
         * The expcmdsn.   Is the value the target expects
         * to be sent for my next cmdsn.  If the expcmdsn
         * and the cmdsn get out of sync this could denote
         * a communication problem.
         */
        uint32_t                sess_cmdsn;
        uint32_t                sess_expcmdsn;
        uint32_t                sess_maxcmdsn;

        /* Next Initiator Task Tag (ITT) to use */
        uint32_t                sess_itt;
        /*
         * The session iscsi_cmd table is used to a fast performance
         * lookup of an ITT to a iscsi_cmd when we receive an iSCSI
         * PDU from the wire.  To reserve a location in the sess_cmd_table
         * we try the sess_itt % ISCSI_CMD_TABLE_SIZE if this cmd table
         * cell is already full.  Then increament the sess_itt and
         * try to get the cell position again, repeat until an empty
         * cell is found.  Once an empty cell is found place your
         * scsi_cmd point into the cell to reserve the location.  This
         * selection process should be done while holding the session's
         * mutex.
         */
        struct iscsi_cmd        *sess_cmd_table[ISCSI_CMD_TABLE_SIZE];
        int                     sess_cmd_table_count;

        /*
         * The pending queue contains all iscsi_cmds that require an
         * open MaxCmdSn window to be put on the wire and haven't
         * been placed on the wire.  Once placed on the wire they
         * will be moved to a connections specific active queue.
         */
        iscsi_queue_t           sess_queue_pending;

        iscsi_error_t           sess_last_err;

        iscsi_queue_t           sess_queue_completion;
        /* configured login parameters */
        iscsi_login_params_t    sess_params;

        /* general iSCSI protocol/session info */
        uchar_t                 sess_name[ISCSI_MAX_NAME_LEN];
        int                     sess_name_length;
        char                    sess_alias[ISCSI_MAX_NAME_LEN];
        int                     sess_alias_length;
        iSCSIDiscoveryMethod_t  sess_discovered_by;
        iscsi_sockaddr_t        sess_discovered_addr;
        uchar_t                 sess_isid[ISCSI_ISID_LEN]; /* Session ID */
        uint16_t                sess_tsid; /* Target ID */
        /*
         * If the target portal group tag(TPGT) is equal to ISCSI_DEFAULT_TPGT
         * then the initiator will accept a successful login with any TPGT
         * specified by the target.  If a none default TPGT is configured
         * then we will only successfully accept a login with that matching
         * TPGT value.
         */
        int                     sess_tpgt_conf;
        /* This field records the negotiated TPGT value, preserved for dtrace */
        int                     sess_tpgt_nego;

        /*
         * Authentication information.
         *
         * DCW: Again IMA seems to take a session view at this
         * information.
         */
        iscsi_auth_t            sess_auth;

        /* Statistics */
        struct {
                kstat_t                 *ks;
                iscsi_sess_stats_t      ks_data;
                kstat_t                 *ks_io;
                kstat_io_t              ks_io_data;
                kmutex_t                ks_io_lock;
        } stats;

        iscsi_thread_t          *sess_ic_thread;
        boolean_t               sess_window_open;
        boolean_t               sess_boot;
        iscsi_sess_type_t       sess_type;

        ddi_taskq_t             *sess_login_taskq;

        iscsi_thread_t          *sess_wd_thread;

        sm_audit_buf_t          sess_state_audit;

        kmutex_t                sess_reset_mutex;

        boolean_t               sess_reset_in_progress;

        boolean_t               sess_boot_nic_reset;
        kmutex_t                sess_enum_lock;
        kcondvar_t              sess_enum_cv;
        iscsi_enum_status_t     sess_enum_status;
        iscsi_enum_result_t     sess_enum_result;
        uint32_t                sess_enum_result_count;
        ddi_taskq_t             *sess_enum_taskq;

        kmutex_t                sess_state_wmutex;
        kcondvar_t              sess_state_wcv;
        boolean_t               sess_state_hasw;

        /* to accelerate the state change in case of new event */
        volatile uint32_t       sess_state_event_count;
} iscsi_sess_t;

/*
 * This structure will be used to store sessions to be online
 * during normal login operation.
 */
typedef struct iscsi_sess_list {
        iscsi_sess_t            *session;
        struct iscsi_sess_list  *next;
} iscsi_sess_list_t;

/*
 * iSCSI client notify task context for deferred IDM notifications processing
 */
typedef struct iscsi_cn_task {
        idm_conn_t              *ct_ic;
        idm_client_notify_t     ct_icn;
        uintptr_t               ct_data;
} iscsi_cn_task_t;

/*
 * iscsi_network
 */
typedef struct iscsi_network {
        void* (*socket)(int domain, int, int);
        int (*bind)(void *, struct sockaddr *, int, int, int);
        int (*connect)(void *, struct sockaddr *, int, int, int);
        int (*listen)(void *, int);
        void* (*accept)(void *, struct sockaddr *, int *);
        int (*getsockname)(void *, struct sockaddr *, socklen_t *);
        int (*getsockopt)(void *, int, int, void *, int *, int);
        int (*setsockopt)(void *, int, int, void *, int);
        int (*shutdown)(void *, int);
        void (*close)(void *);

        size_t (*poll)(void *, clock_t);
        size_t (*sendmsg)(void *, struct msghdr *);
        size_t (*recvmsg)(void *, struct msghdr *, int);

        iscsi_status_t (*sendpdu)(void *, iscsi_hdr_t *, char *, int);
        iscsi_status_t (*recvdata)(void *, iscsi_hdr_t *, char *,
            int, int, int);
        iscsi_status_t (*recvhdr)(void *, iscsi_hdr_t *, int, int, int);

        struct {
                int                     sndbuf;
                int                     rcvbuf;
                int                     nodelay;
                int                     conn_notify_threshold;
                int                     conn_abort_threshold;
                int                     abort_threshold;
        } tweaks;
} iscsi_network_t;

#define ISCSI_NET_HEADER_DIGEST 0x00000001
#define ISCSI_NET_DATA_DIGEST   0x00000002

extern iscsi_network_t *iscsi_net;

/*
 * If we get bus_config requests in less than 5 seconds
 * apart skip the name services re-discovery and just
 * complete the requested logins.  This protects against
 * bus_config storms from stale /dev links.
 */
#define ISCSI_CONFIG_STORM_DELAY_DEFAULT    5

/*
 * iSCSI HBA Structure
 */
typedef struct iscsi_hba {
        uint32_t                hba_sig;
        dev_info_t              *hba_dip;       /* dev info ptr */
        scsi_hba_tran_t         *hba_tran;      /* scsi tran ptr */
        ldi_ident_t             hba_li;

        struct iscsi_sess       *hba_sess_list; /* sess. list for hba */
        krwlock_t               hba_sess_list_rwlock; /* protect sess. list */

        /* lbolt of the last time we received a config request */
        clock_t                 hba_config_lbolt;
        /* current number of seconds to protect against bus config storms */
        int                     hba_config_storm_delay;

        /* general iSCSI protocol hba/initiator info */
        uchar_t                 hba_name[ISCSI_MAX_NAME_LEN];
        int                     hba_name_length;
        uchar_t                 hba_alias[ISCSI_MAX_NAME_LEN];
        int                     hba_alias_length;

        /* Default SessionID for HBA */
        uchar_t                 hba_isid[ISCSI_ISID_LEN];

        /* Default HBA wide settings */
        iscsi_login_params_t    hba_params;

        /*
         * There's only one HBA and it's set to ISCSI_INITIATOR_OID
         * (value of 1) at the beginning of time.
         */
        uint32_t                hba_oid;

        /*
         * Keep track of which events have been sent. User daemons request
         * this information so they don't wait for events which they won't
         * see.
         */
        kmutex_t                hba_discovery_events_mutex;
        iSCSIDiscoveryMethod_t  hba_discovery_events;
        boolean_t               hba_discovery_in_progress;

        boolean_t               hba_mpxio_enabled; /* mpxio-enabled */
        /* if the persistent store is loaded */
        boolean_t               hba_persistent_loaded;

        /*
         * Ensures only one SendTargets operation occurs at a time
         */
        ksema_t                 hba_sendtgts_semaphore;

        /*
         * Statistics
         */
        struct {
                kstat_t                 *ks;
                iscsi_hba_stats_t       ks_data;
        } stats;

        /*
         * track/control the service status and client
         *
         * service- service online ensures the operational of cli
         *        - and the availability of iSCSI discovery/devices
         *        - so obviously offline means the unusable of cli
         *        - , disabling of all discovery methods and to offline
         *        - all discovered devices
         *
         * client - here the client actually means 'exclusive client'
         *        - for operations these clients take may conflict
         *        - with the changing of service status and therefore
         *        - need to be exclusive
         *
         * The service has three status:
         *      ISCSI_SERVICE_ENABLED    -      client is permitted to
         *                               -      request service
         *
         *      ISCSI_SERVICE_DISABLED   -      client is not permitted to
         *                               -      request service
         *
         *      ISCSI_SERVICE_TRANSITION -      client must wait for
         *                               -      one of above two statuses
         *
         * The hba_service_client_count tracks the number of
         * current clients, it increases with new clients and decreases
         * with leaving clients. It stops to increase once the
         * ISCSI_SERVICE_TRANSITION is set, and causes later clients be
         * blocked there.
         *
         * The status of the service can only be changed when the number
         * of current clients reaches zero.
         *
         * Clients include:
         *      iscsi_ioctl
         *      iscsi_tran_bus_config
         *      iscsi_tran_bus_unconfig
         *      isns_scn_callback
         */
        kmutex_t                hba_service_lock;
        kcondvar_t              hba_service_cv;
        uint32_t                hba_service_status;
        uint32_t                hba_service_client_count;

        /* Default HBA tunable settings */
        iscsi_tunable_params_t  hba_tunable_params;
        boolean_t               hba_service_status_overwrite;
} iscsi_hba_t;

/*
 * +--------------------------------------------------------------------+
 * | iSCSI prototypes                                                   |
 * +--------------------------------------------------------------------+
 */

/* IDM client callback entry points */
idm_rx_pdu_cb_t iscsi_rx_scsi_rsp;
idm_rx_pdu_cb_t iscsi_rx_misc_pdu;
idm_rx_pdu_error_cb_t iscsi_rx_error_pdu;
idm_build_hdr_cb_t iscsi_build_hdr;
idm_task_cb_t iscsi_task_aborted;
idm_client_notify_cb_t iscsi_client_notify;

/* iscsi_io.c */
int iscsi_sna_lte(uint32_t n1, uint32_t n2);
char *iscsi_get_next_text(char *data, int data_length, char *curr_text);

void iscsi_ic_thread(iscsi_thread_t *thread, void *arg);
void iscsi_tx_thread(iscsi_thread_t *thread, void *arg);
void iscsi_wd_thread(iscsi_thread_t *thread, void *arg);

iscsi_status_t iscsi_tx_cmd(iscsi_sess_t *isp, iscsi_cmd_t *icmdp);

void iscsi_task_cleanup(int opcode, iscsi_cmd_t *icmdp);

void iscsi_handle_abort(void *arg);
iscsi_status_t iscsi_handle_reset(iscsi_sess_t *isp, int level,
    iscsi_lun_t *ilp);
iscsi_status_t iscsi_handle_logout(iscsi_conn_t *icp);
iscsi_status_t iscsi_handle_passthru(iscsi_sess_t *isp, uint16_t lun,
    struct uscsi_cmd *ucmdp);
iscsi_status_t iscsi_handle_text(iscsi_conn_t *icp,
    char *buf, uint32_t buf_len, uint32_t data_len, uint32_t *rx_data_len);

void iscsi_iodone(iscsi_sess_t *isp, iscsi_cmd_t *icmdp);

/* iscsi_crc.c */
uint32_t iscsi_crc32c(void *address, unsigned long length);
uint32_t iscsi_crc32c_continued(void *address, unsigned long length,
    uint32_t crc);

/* iscsi_queue.c */
void iscsi_init_queue(iscsi_queue_t *queue);
void iscsi_destroy_queue(iscsi_queue_t *queue);
void iscsi_enqueue_pending_cmd(iscsi_sess_t *isp, iscsi_cmd_t *icmdp);
void iscsi_dequeue_pending_cmd(iscsi_sess_t *isp, iscsi_cmd_t *icmdp);
void iscsi_enqueue_active_cmd(iscsi_conn_t *icp, iscsi_cmd_t *icmdp);
void iscsi_dequeue_active_cmd(iscsi_conn_t *icp, iscsi_cmd_t *icmdp);
void iscsi_enqueue_idm_aborting_cmd(iscsi_conn_t *icp, iscsi_cmd_t *icmdp);
void iscsi_dequeue_idm_aborting_cmd(iscsi_conn_t *icp, iscsi_cmd_t *icmdp);
void iscsi_enqueue_completed_cmd(iscsi_sess_t *isp, iscsi_cmd_t *icmdp);
iscsi_status_t iscsi_dequeue_cmd(iscsi_cmd_t **, iscsi_cmd_t **, iscsi_cmd_t *);
void iscsi_move_queue(iscsi_queue_t *src_queue, iscsi_queue_t *dst_queue);
void iscsi_enqueue_cmd_head(iscsi_cmd_t **, iscsi_cmd_t **,
    iscsi_cmd_t *);

/* iscsi_login.c */
void iscsi_login_cb(void *arg);
iscsi_status_t iscsi_login_start(void *arg);
void iscsi_login_update_state(iscsi_conn_t *icp,
    iscsi_login_state_t next_state);
void iscsi_login_update_state_locked(iscsi_conn_t *icp,
    iscsi_login_state_t next_state);


/* iscsi_stats.c */
boolean_t iscsi_hba_kstat_init(struct iscsi_hba *ihp);
boolean_t iscsi_hba_kstat_term(struct iscsi_hba *ihp);
boolean_t iscsi_sess_kstat_init(struct iscsi_sess *isp);
boolean_t iscsi_sess_kstat_term(struct iscsi_sess *isp);
boolean_t iscsi_conn_kstat_init(struct iscsi_conn       *icp);
void iscsi_conn_kstat_term(struct iscsi_conn *icp);

/* iscsi_net.c */
void iscsi_net_init();
void iscsi_net_fini();
iscsi_status_t iscsi_net_interface(boolean_t reset);

/* iscsi_sess.c */
iscsi_sess_t *iscsi_sess_create(iscsi_hba_t *ihp,
    iSCSIDiscoveryMethod_t method, struct sockaddr *addr_dsc,
    char *target_name, int tpgt, uchar_t isid_lsb,
    iscsi_sess_type_t type, uint32_t *oid);
void iscsi_sess_online(void *arg);
int iscsi_sess_get(uint32_t oid, iscsi_hba_t *ihp, iscsi_sess_t **ispp);
iscsi_status_t iscsi_sess_destroy(iscsi_sess_t *isp);
void iscsi_sess_state_machine(iscsi_sess_t *isp, iscsi_sess_event_t event,
    uint32_t event_count);
char *iscsi_sess_state_str(iscsi_sess_state_t state);
boolean_t iscsi_sess_set_auth(iscsi_sess_t *isp);
iscsi_status_t iscsi_sess_reserve_scsi_itt(iscsi_cmd_t *icmdp);
void iscsi_sess_release_scsi_itt(iscsi_cmd_t *icmdp);
iscsi_status_t iscsi_sess_reserve_itt(iscsi_sess_t *isp, iscsi_cmd_t *icmdp);
void iscsi_sess_release_itt(iscsi_sess_t *isp, iscsi_cmd_t *icmdp);
void iscsi_sess_redrive_io(iscsi_sess_t *isp);
int iscsi_sess_get_by_target(uint32_t target_oid, iscsi_hba_t *ihp,
    iscsi_sess_t **ispp);
iscsi_enum_result_t iscsi_sess_enum_request(iscsi_sess_t *isp,
    boolean_t wait, uint32_t event_count);
iscsi_enum_result_t iscsi_sess_enum_query(iscsi_sess_t *isp);
void iscsi_sess_enter_state_zone(iscsi_sess_t *isp);
void iscsi_sess_exit_state_zone(iscsi_sess_t *isp);

/* iscsi_conn.c */
iscsi_status_t iscsi_conn_create(struct sockaddr *addr, iscsi_sess_t *isp,
    iscsi_conn_t **icpp);
iscsi_status_t iscsi_conn_online(iscsi_conn_t *icp);
iscsi_status_t iscsi_conn_offline(iscsi_conn_t *icp);
iscsi_status_t iscsi_conn_destroy(iscsi_conn_t *icp);
void iscsi_conn_set_login_min_max(iscsi_conn_t *icp, int min, int max);
iscsi_status_t iscsi_conn_sync_params(iscsi_conn_t *icp);
void iscsi_conn_retry(iscsi_sess_t *isp, iscsi_conn_t *icp);
void iscsi_conn_update_state(iscsi_conn_t *icp, iscsi_conn_state_t next_state);
void iscsi_conn_update_state_locked(iscsi_conn_t *icp,
                        iscsi_conn_state_t next_state);

/* iscsi_lun.c */
iscsi_status_t iscsi_lun_create(iscsi_sess_t *isp, uint16_t lun_num,
    uint8_t lun_addr_type, struct scsi_inquiry *inq, char *guid);
void iscsi_lun_hold(iscsi_lun_t *ilp);
void iscsi_lun_rele(iscsi_lun_t *ilp);
iscsi_status_t iscsi_lun_destroy(iscsi_hba_t *ihp, iscsi_lun_t *ilp);
void iscsi_lun_online(iscsi_hba_t *ihp,
    iscsi_lun_t *ilp);
iscsi_status_t iscsi_lun_offline(iscsi_hba_t *ihp,
    iscsi_lun_t *ilp, boolean_t lun_free);

/* iscsi_cmd.c */
void iscsi_cmd_state_machine(iscsi_cmd_t *icmdp,
    iscsi_cmd_event_t event, void *arg);
iscsi_cmd_t     *iscsi_cmd_alloc(iscsi_conn_t *icp, int km_flags);
void            iscsi_cmd_free(iscsi_cmd_t *icmdp);

/* iscsi_ioctl.c */
void * iscsi_ioctl_copyin(caddr_t arg, int mode, size_t size);
int iscsi_ioctl_copyout(void *data, size_t size, caddr_t arg, int mode);
iscsi_conn_list_t *iscsi_ioctl_conn_oid_list_get_copyin(caddr_t, int);
int iscsi_ioctl_conn_oid_list_get_copyout(iscsi_conn_list_t *, caddr_t, int);
boolean_t iscsi_ioctl_conn_oid_list_get(iscsi_hba_t *ihp,
    iscsi_conn_list_t *cl);
boolean_t iscsi_ioctl_conn_props_get(iscsi_hba_t *ihp, iscsi_conn_props_t *cp);
int iscsi_ioctl_sendtgts_get(iscsi_hba_t *ihp, iscsi_sendtgts_list_t *stl);
int iscsi_target_prop_mod(iscsi_hba_t *, iscsi_property_t *, int cmd);
int iscsi_set_params(iscsi_param_set_t *, iscsi_hba_t *, boolean_t);
int iscsi_get_persisted_param(uchar_t *, iscsi_param_get_t *,
    iscsi_login_params_t *);
void iscsi_set_default_login_params(iscsi_login_params_t *params);
int iscsi_ioctl_get_config_sess(iscsi_hba_t *ihp,
    iscsi_config_sess_t *ics);
int iscsi_ioctl_set_config_sess(iscsi_hba_t *ihp,
    iscsi_config_sess_t *ics);
int iscsi_ioctl_set_tunable_param(iscsi_hba_t *ihp,
    iscsi_tunable_object_t *tpss);
/* ioctls  prototypes */
int iscsi_get_param(iscsi_login_params_t *params,
    boolean_t valid_flag,
    iscsi_param_get_t *ipgp);

/* iscsid.c */
boolean_t iscsid_init(iscsi_hba_t *ihp);
boolean_t iscsid_start(iscsi_hba_t *ihp);
boolean_t iscsid_stop(iscsi_hba_t *ihp);
void iscsid_fini();
void iscsid_props(iSCSIDiscoveryProperties_t *props);
boolean_t iscsid_enable_discovery(iscsi_hba_t *ihp,
    iSCSIDiscoveryMethod_t idm, boolean_t poke);
boolean_t iscsid_disable_discovery(iscsi_hba_t *ihp,
    iSCSIDiscoveryMethod_t idm);
void iscsid_poke_discovery(iscsi_hba_t *ihp, iSCSIDiscoveryMethod_t method);
void iscsid_do_sendtgts(entry_t *discovery_addr);
void iscsid_do_isns_query_one_server(
    iscsi_hba_t *ihp, entry_t *isns_addr);
void iscsid_do_isns_query(iscsi_hba_t *ihp);
void iscsid_config_one(iscsi_hba_t *ihp,
    char *name, boolean_t protect);
void iscsid_config_all(iscsi_hba_t *ihp, boolean_t protect);
void iscsid_unconfig_one(iscsi_hba_t *ihp, char *name);
void iscsid_unconfig_all(iscsi_hba_t *ihp);
void isns_scn_callback(void *arg);
boolean_t iscsid_del(iscsi_hba_t *ihp, char *target_name,
    iSCSIDiscoveryMethod_t method, struct sockaddr *addr_dsc);
boolean_t iscsid_login_tgt(iscsi_hba_t *ihp, char *target_name,
    iSCSIDiscoveryMethod_t method, struct sockaddr *addr_dsc);
void iscsid_addr_to_sockaddr(int src_insize, void *src_addr, int src_port,
    struct sockaddr *dst_addr);
void iscsid_set_default_initiator_node_settings(iscsi_hba_t *ihp,
    boolean_t minimal);

void iscsi_send_sysevent(iscsi_hba_t *ihp, char *eventcalss,
    char *subclass, nvlist_t *np);
boolean_t iscsi_reconfig_boot_sess(iscsi_hba_t *ihp);
boolean_t iscsi_chk_bootlun_mpxio(iscsi_hba_t *ihp);
boolean_t iscsi_cmp_boot_ini_name(char *name);
boolean_t iscsi_cmp_boot_tgt_name(char *name);
boolean_t iscsi_client_request_service(iscsi_hba_t *ihp);
void iscsi_client_release_service(iscsi_hba_t *ihp);

extern void bcopy(const void *s1, void *s2, size_t n);
extern void bzero(void *s, size_t n);

#ifdef __cplusplus
}
#endif

#endif /* _ISCSI_H */