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[PATCH 2/3] add open iscsi netlink interface to iscsi transport class

To: linux-scsi <linux-scsi@xxxxxxxxxxxxxxx>, netdev <netdev@xxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx
Subject: [PATCH 2/3] add open iscsi netlink interface to iscsi transport class
From: Mike Christie <michaelc@xxxxxxxxxxx>
Date: Wed, 04 May 2005 19:53:53 -0700
Sender: netdev-bounce@xxxxxxxxxxx
User-agent: Mozilla Thunderbird 1.0 (X11/20041206)
attached common-iscsi-headers.patch - Common header files:
 - iscsi_if.h (user/kernel #defines);
 - iscsi_proto.h (RFC3720 #defines and types);
 - iscsi_ifev.h (user/kernel events).


Thanks,

Linux-iscsi Team

Signed-off-by: Alex Aizman <itn780@xxxxxxxxx>
Signed-off-by: Dmitry Yusupov <dmitry_yus@xxxxxxxxx>
Signed-off-by: Mike Christie <michaelc@xxxxxxxxxxx>
diff -Naurp linux-2.6.12-rc3.orig/include/scsi/iscsi_ifev.h 
linux-2.6.12-rc3/include/scsi/iscsi_ifev.h
--- linux-2.6.12-rc3.orig/include/scsi/iscsi_ifev.h     1969-12-31 
16:00:00.000000000 -0800
+++ linux-2.6.12-rc3/include/scsi/iscsi_ifev.h  2005-05-04 18:21:43.000000000 
-0700
@@ -0,0 +1,121 @@
+/*
+ * iSCSI Kernel/User Interface Events
+ *
+ * Copyright (C) 2005 Dmitry Yusupov, Alex Aizman
+ * maintained by open-iscsi@xxxxxxxxxxxxxxxx
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * See the file COPYING included with this distribution for more details.
+ */
+
+#ifndef ISCSI_IFEV_H
+#define ISCSI_IFEV_H
+
+enum iscsi_uevent_e {
+       ISCSI_UEVENT_UNKNOWN            = 0,
+
+       /* down events */
+       ISCSI_UEVENT_CREATE_SESSION     = UEVENT_BASE + 1,
+       ISCSI_UEVENT_DESTROY_SESSION    = UEVENT_BASE + 2,
+       ISCSI_UEVENT_CREATE_CNX         = UEVENT_BASE + 3,
+       ISCSI_UEVENT_DESTROY_CNX        = UEVENT_BASE + 4,
+       ISCSI_UEVENT_BIND_CNX           = UEVENT_BASE + 5,
+       ISCSI_UEVENT_SET_PARAM          = UEVENT_BASE + 6,
+       ISCSI_UEVENT_START_CNX          = UEVENT_BASE + 7,
+       ISCSI_UEVENT_STOP_CNX           = UEVENT_BASE + 8,
+       ISCSI_UEVENT_SEND_PDU           = UEVENT_BASE + 9,
+       ISCSI_UEVENT_TRANS_LIST         = UEVENT_BASE + 10,
+       ISCSI_UEVENT_GET_STATS          = UEVENT_BASE + 11,
+       ISCSI_UEVENT_GET_PARAM          = UEVENT_BASE + 12,
+
+       /* up events */
+       ISCSI_KEVENT_RECV_PDU           = KEVENT_BASE + 1,
+       ISCSI_KEVENT_CNX_ERROR          = KEVENT_BASE + 2,
+       ISCSI_KEVENT_IF_ERROR           = KEVENT_BASE + 3,
+};
+
+struct iscsi_uevent {
+       uint32_t type; /* k/u events type */
+       uint32_t iferror; /* carries interface or resource errors */
+       uint64_t transport_handle;
+
+       union {
+               /* messages u -> k */
+               struct msg_create_session {
+                       uint32_t        initial_cmdsn;
+               } c_session;
+               struct msg_destroy_session {
+                       uint64_t        session_handle;
+                       uint32_t        sid;
+               } d_session;
+               struct msg_create_cnx {
+                       uint64_t        session_handle;
+                       uint32_t        cid;
+                       uint32_t        sid;
+               } c_cnx;
+               struct msg_bind_cnx {
+                       uint64_t        session_handle;
+                       uint64_t        cnx_handle;
+                       uint32_t        transport_fd;
+                       uint32_t        is_leading;
+               } b_cnx;
+               struct msg_destroy_cnx {
+                       uint64_t        cnx_handle;
+                       uint32_t        cid;
+               } d_cnx;
+               struct msg_send_pdu {
+                       uint32_t        hdr_size;
+                       uint32_t        data_size;
+                       uint64_t        cnx_handle;
+               } send_pdu;
+               struct msg_set_param {
+                       uint64_t        cnx_handle;
+                       uint32_t        param; /* enum iscsi_param */
+                       uint32_t        value;
+               } set_param;
+               struct msg_start_cnx {
+                       uint64_t        cnx_handle;
+               } start_cnx;
+               struct msg_stop_cnx {
+                       uint64_t        cnx_handle;
+                       uint32_t        flag;
+               } stop_cnx;
+               struct msg_get_stats {
+                       uint64_t        cnx_handle;
+               } get_stats;
+       } u;
+       union {
+               /* messages k -> u */
+               uint64_t                handle;
+               int                     retcode;
+               struct msg_create_session_ret {
+                       uint64_t        session_handle;
+                       uint32_t        sid;
+               } c_session_ret;
+               struct msg_recv_req {
+                       uint64_t        recv_handle;
+                       uint64_t        cnx_handle;
+               } recv_req;
+               struct msg_cnx_error {
+                       uint64_t        cnx_handle;
+                       uint32_t        error; /* enum iscsi_err */
+               } cnxerror;
+               struct msg_trans_list {
+                       struct {
+                               uint64_t trans_handle;
+                               char name[ISCSI_TRANSPORT_NAME_MAXLEN];
+                       } elements[ISCSI_TRANSPORT_MAX];
+               } t_list;
+       } r;
+} __attribute__ ((aligned (sizeof(unsigned long))));
+
+#endif /* ISCSI_IFEV_H */
diff -Naurp linux-2.6.12-rc3.orig/include/scsi/iscsi_if.h 
linux-2.6.12-rc3/include/scsi/iscsi_if.h
--- linux-2.6.12-rc3.orig/include/scsi/iscsi_if.h       1969-12-31 
16:00:00.000000000 -0800
+++ linux-2.6.12-rc3/include/scsi/iscsi_if.h    2005-05-04 18:22:05.000000000 
-0700
@@ -0,0 +1,155 @@
+/*
+ * iSCSI User/Kernel Shares (Defines, Constants, Protocol definitions, etc)
+ *
+ * Copyright (C) 2005 Dmitry Yusupov, Alex Aizman
+ * maintained by open-iscsi@xxxxxxxxxxxxxxxx
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * See the file COPYING included with this distribution for more details.
+ */
+
+#ifndef ISCSI_IF_H
+#define ISCSI_IF_H
+
+#include <scsi/iscsi_proto.h>
+
+#define ISCSI_TRANSPORT_NAME_MAXLEN    16
+#define ISCSI_TRANSPORT_MAX            1
+#define UEVENT_BASE                    10
+#define KEVENT_BASE                    100
+#define ISCSI_ERR_BASE                 1000
+
+/*
+ * Common error codes
+ */
+enum iscsi_err {
+       ISCSI_OK                        = 0,
+
+       ISCSI_ERR_DATASN                = ISCSI_ERR_BASE + 1,
+       ISCSI_ERR_DATA_OFFSET           = ISCSI_ERR_BASE + 2,
+       ISCSI_ERR_MAX_CMDSN             = ISCSI_ERR_BASE + 3,
+       ISCSI_ERR_EXP_CMDSN             = ISCSI_ERR_BASE + 4,
+       ISCSI_ERR_BAD_OPCODE            = ISCSI_ERR_BASE + 5,
+       ISCSI_ERR_DATALEN               = ISCSI_ERR_BASE + 6,
+       ISCSI_ERR_AHSLEN                = ISCSI_ERR_BASE + 7,
+       ISCSI_ERR_PROTO                 = ISCSI_ERR_BASE + 8,
+       ISCSI_ERR_LUN                   = ISCSI_ERR_BASE + 9,
+       ISCSI_ERR_BAD_ITT               = ISCSI_ERR_BASE + 10,
+       ISCSI_ERR_CNX_FAILED            = ISCSI_ERR_BASE + 11,
+       ISCSI_ERR_R2TSN                 = ISCSI_ERR_BASE + 12,
+       ISCSI_ERR_SNX_FAILED            = ISCSI_ERR_BASE + 13,
+       ISCSI_ERR_HDR_DGST              = ISCSI_ERR_BASE + 14,
+       ISCSI_ERR_DATA_DGST             = ISCSI_ERR_BASE + 15,
+       ISCSI_ERR_PDU_GATHER_FAILED     = ISCSI_ERR_BASE + 16,
+       ISCSI_ERR_PARAM_NOT_FOUND       = ISCSI_ERR_BASE + 17
+};
+
+/*
+ * iSCSI Parameters (RFC3720)
+ */
+enum iscsi_param {
+       ISCSI_PARAM_MAX_RECV_DLENGTH    = 0,
+       ISCSI_PARAM_MAX_XMIT_DLENGTH    = 1,
+       ISCSI_PARAM_HDRDGST_EN          = 2,
+       ISCSI_PARAM_DATADGST_EN         = 3,
+       ISCSI_PARAM_INITIAL_R2T_EN      = 4,
+       ISCSI_PARAM_MAX_R2T             = 5,
+       ISCSI_PARAM_IMM_DATA_EN         = 6,
+       ISCSI_PARAM_FIRST_BURST         = 7,
+       ISCSI_PARAM_MAX_BURST           = 8,
+       ISCSI_PARAM_PDU_INORDER_EN      = 9,
+       ISCSI_PARAM_DATASEQ_INORDER_EN  = 10,
+       ISCSI_PARAM_ERL                 = 11,
+       ISCSI_PARAM_IFMARKER_EN         = 12,
+       ISCSI_PARAM_OFMARKER_EN         = 13,
+};
+#define ISCSI_PARAM_MAX                        14
+
+typedef uint64_t iscsi_snx_t;          /* iSCSI Data-Path session handle */
+typedef uint64_t iscsi_cnx_t;          /* iSCSI Data-Path connection handle */
+
+#define iscsi_ptr(_handle) ((void*)(unsigned long)_handle)
+#define iscsi_handle(_ptr) ((uint64_t)(unsigned long)_ptr)
+#define iscsi_hostdata(_hostdata) ((void*)_hostdata + sizeof(unsigned long))
+
+/*
+ * These flags presents iSCSI Data-Path capabilities.
+ */
+#define CAP_RECOVERY_L0                0x1
+#define CAP_RECOVERY_L1                0x2
+#define CAP_RECOVERY_L2                0x4
+#define CAP_MULTI_R2T          0x8
+#define CAP_HDRDGST            0x10
+#define CAP_DATADGST           0x20
+#define CAP_MULTI_CNX          0x40
+#define CAP_TEXT_NEGO          0x80
+
+/*
+ * These flags describes reason of stop_cnx() call
+ */
+#define STOP_CNX_TERM          0x1
+#define STOP_CNX_SUSPEND       0x2
+#define STOP_CNX_RECOVER       0x3
+
+#define ISCSI_STATS_CUSTOM_MAX         32
+#define ISCSI_STATS_CUSTOM_DESC_MAX    64
+struct iscsi_stats_custom {
+       char desc[ISCSI_STATS_CUSTOM_DESC_MAX];
+       uint64_t value;
+};
+
+/*
+ * struct iscsi_stats - iSCSI Statistics (iSCSI MIB)
+ *
+ * Note: this structure contains counters collected on per-connection basis.
+ */
+struct iscsi_stats {
+       /* octets */
+       uint64_t txdata_octets;
+       uint64_t rxdata_octets;
+
+       /* xmit pdus */
+       uint32_t noptx_pdus;
+       uint32_t scsicmd_pdus;
+       uint32_t tmfcmd_pdus;
+       uint32_t login_pdus;
+       uint32_t text_pdus;
+       uint32_t dataout_pdus;
+       uint32_t logout_pdus;
+       uint32_t snack_pdus;
+
+       /* recv pdus */
+       uint32_t noprx_pdus;
+       uint32_t scsirsp_pdus;
+       uint32_t tmfrsp_pdus;
+       uint32_t textrsp_pdus;
+       uint32_t datain_pdus;
+       uint32_t logoutrsp_pdus;
+       uint32_t r2t_pdus;
+       uint32_t async_pdus;
+       uint32_t rjt_pdus;
+
+       /* errors */
+       uint32_t digest_err;
+       uint32_t timeout_err;
+
+       /*
+        * iSCSI Custom Statistics support, i.e. Transport could
+        * extend existing MIB statistics with its own specific statistics
+        * up to ISCSI_STATS_CUSTOM_MAX
+        */
+       uint32_t custom_length;
+       struct iscsi_stats_custom custom[0]
+               __attribute__ ((aligned (sizeof(unsigned long))));
+};
+
+#endif
diff -Naurp linux-2.6.12-rc3.orig/include/scsi/iscsi_proto.h 
linux-2.6.12-rc3/include/scsi/iscsi_proto.h
--- linux-2.6.12-rc3.orig/include/scsi/iscsi_proto.h    1969-12-31 
16:00:00.000000000 -0800
+++ linux-2.6.12-rc3/include/scsi/iscsi_proto.h 2005-05-04 18:21:43.000000000 
-0700
@@ -0,0 +1,565 @@
+/*
+ * RFC 3720 (iSCSI) protocol data types
+ *
+ * Copyright (C) 2005 Dmitry Yusupov, Alex Aizman
+ * maintained by open-iscsi@xxxxxxxxxxxxxxxx
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * See the file COPYING included with this distribution for more details.
+ */
+
+#ifndef ISCSI_PROTO_H
+#define ISCSI_PROTO_H
+
+#define ISCSI_VERSION_STR      "0.3"
+#define ISCSI_DATE_STR         "22-Apr-2005"
+#define ISCSI_DRAFT20_VERSION  0x00
+
+/* default iSCSI listen port for incoming connections */
+#define ISCSI_LISTEN_PORT      3260
+
+/* Padding word length */
+#define PAD_WORD_LEN           4
+
+/*
+ * useful common(control and data pathes) macro
+ */
+#define ntoh24(p) (((p)[0] << 16) | ((p)[1] << 8) | ((p)[2]))
+#define hton24(p, v) { \
+        p[0] = (((v) >> 16) & 0xFF); \
+        p[1] = (((v) >> 8) & 0xFF); \
+        p[2] = ((v) & 0xFF); \
+}
+#define zero_data(p) {p[0]=0;p[1]=0;p[2]=0;}
+
+/*
+ * iSCSI Template Message Header
+ */
+struct iscsi_hdr {
+       uint8_t         opcode;
+       uint8_t         flags;          /* Final bit */
+       uint8_t         rsvd2[2];
+       uint8_t         hlength;        /* AHSs total length */
+       uint8_t         dlength[3];     /* Data length */
+       uint8_t         lun[8];
+       __be32          itt;            /* Initiator Task Tag */
+       __be32          ttt;            /* Target Task Tag */
+       __be32          statsn;
+       __be32          exp_statsn;
+       uint8_t         other[16];
+};
+
+/************************* RFC 3720 Begin *****************************/
+
+#define ISCSI_RESERVED_TAG             0xffffffff
+
+/* Opcode encoding bits */
+#define ISCSI_OP_RETRY                 0x80
+#define ISCSI_OP_IMMEDIATE             0x40
+#define ISCSI_OPCODE_MASK              0x3F
+
+/* Initiator Opcode values */
+#define ISCSI_OP_NOOP_OUT              0x00
+#define ISCSI_OP_SCSI_CMD              0x01
+#define ISCSI_OP_SCSI_TMFUNC           0x02
+#define ISCSI_OP_LOGIN                 0x03
+#define ISCSI_OP_TEXT                  0x04
+#define ISCSI_OP_SCSI_DATA_OUT         0x05
+#define ISCSI_OP_LOGOUT                        0x06
+#define ISCSI_OP_SNACK                 0x10
+
+/* Target Opcode values */
+#define ISCSI_OP_NOOP_IN               0x20
+#define ISCSI_OP_SCSI_CMD_RSP          0x21
+#define ISCSI_OP_SCSI_TMFUNC_RSP       0x22
+#define ISCSI_OP_LOGIN_RSP             0x23
+#define ISCSI_OP_TEXT_RSP              0x24
+#define ISCSI_OP_SCSI_DATA_IN          0x25
+#define ISCSI_OP_LOGOUT_RSP            0x26
+#define ISCSI_OP_R2T                   0x31
+#define ISCSI_OP_ASYNC_EVENT           0x32
+#define ISCSI_OP_REJECT                        0x3f
+
+/* SCSI Command Header */
+struct iscsi_cmd {
+       uint8_t opcode;
+       uint8_t flags;
+       uint8_t rsvd2;
+       uint8_t cmdrn;
+       uint8_t hlength;
+       uint8_t dlength[3];
+       uint8_t lun[8];
+       __be32 itt;     /* Initiator Task Tag */
+       __be32 data_length;
+       __be32 cmdsn;
+       __be32 exp_statsn;
+       uint8_t cdb[16];        /* SCSI Command Block */
+       /* Additional Data (Command Dependent) */
+};
+
+/* Command PDU flags */
+#define ISCSI_FLAG_CMD_FINAL           0x80
+#define ISCSI_FLAG_CMD_READ            0x40
+#define ISCSI_FLAG_CMD_WRITE           0x20
+#define ISCSI_FLAG_CMD_ATTR_MASK       0x07    /* 3 bits */
+
+/* SCSI Command Attribute values */
+#define ISCSI_ATTR_UNTAGGED            0
+#define ISCSI_ATTR_SIMPLE              1
+#define ISCSI_ATTR_ORDERED             2
+#define ISCSI_ATTR_HEAD_OF_QUEUE       3
+#define ISCSI_ATTR_ACA                 4
+
+/* SCSI Response Header */
+struct iscsi_cmd_rsp {
+       uint8_t opcode;
+       uint8_t flags;
+       uint8_t response;
+       uint8_t cmd_status;
+       uint8_t hlength;
+       uint8_t dlength[3];
+       uint8_t rsvd[8];
+       __be32  itt;    /* Initiator Task Tag */
+       __be32  rsvd1;
+       __be32  statsn;
+       __be32  exp_cmdsn;
+       __be32  max_cmdsn;
+       __be32  exp_datasn;
+       __be32  bi_residual_count;
+       __be32  residual_count;
+       /* Response or Sense Data (optional) */
+};
+
+/* Command Response PDU flags */
+#define ISCSI_FLAG_CMD_BIDI_OVERFLOW   0x10
+#define ISCSI_FLAG_CMD_BIDI_UNDERFLOW  0x08
+#define ISCSI_FLAG_CMD_OVERFLOW                0x04
+#define ISCSI_FLAG_CMD_UNDERFLOW       0x02
+
+/* iSCSI Status values. Valid if Rsp Selector bit is not set */
+#define ISCSI_STATUS_CMD_COMPLETED     0
+#define ISCSI_STATUS_TARGET_FAILURE    1
+#define ISCSI_STATUS_SUBSYS_FAILURE    2
+
+/* Asynchronous Event Header */
+struct iscsi_async {
+       uint8_t opcode;
+       uint8_t flags;
+       uint8_t rsvd2[2];
+       uint8_t rsvd3;
+       uint8_t dlength[3];
+       uint8_t lun[8];
+       uint8_t rsvd4[8];
+       __be32  statsn;
+       __be32  exp_cmdsn;
+       __be32  max_cmdsn;
+       uint8_t async_event;
+       uint8_t async_vcode;
+       __be16  param1;
+       __be16  param2;
+       __be16  param3;
+       uint8_t rsvd5[4];
+};
+
+/* iSCSI Event Codes */
+#define ISCSI_ASYNC_MSG_SCSI_EVENT                     0
+#define ISCSI_ASYNC_MSG_REQUEST_LOGOUT                 1
+#define ISCSI_ASYNC_MSG_DROPPING_CONNECTION            2
+#define ISCSI_ASYNC_MSG_DROPPING_ALL_CONNECTIONS       3
+#define ISCSI_ASYNC_MSG_PARAM_NEGOTIATION              4
+#define ISCSI_ASYNC_MSG_VENDOR_SPECIFIC                        255
+
+/* NOP-Out Message */
+struct iscsi_nopout {
+       uint8_t opcode;
+       uint8_t flags;
+       __be16  rsvd2;
+       uint8_t rsvd3;
+       uint8_t dlength[3];
+       uint8_t lun[8];
+       __be32  itt;    /* Initiator Task Tag */
+       __be32  ttt;    /* Target Transfer Tag */
+       __be32  cmdsn;
+       __be32  exp_statsn;
+       uint8_t rsvd4[16];
+};
+
+/* NOP-In Message */
+struct iscsi_nopin {
+       uint8_t opcode;
+       uint8_t flags;
+       __be16  rsvd2;
+       uint8_t rsvd3;
+       uint8_t dlength[3];
+       uint8_t lun[8];
+       __be32  itt;    /* Initiator Task Tag */
+       __be32  ttt;    /* Target Transfer Tag */
+       __be32  statsn;
+       __be32  exp_cmdsn;
+       __be32  max_cmdsn;
+       uint8_t rsvd4[12];
+};
+
+/* SCSI Task Management Message Header */
+struct iscsi_tm {
+       uint8_t opcode;
+       uint8_t flags;
+       uint8_t rsvd1[2];
+       uint8_t hlength;
+       uint8_t dlength[3];
+       uint8_t lun[8];
+       __be32  itt;    /* Initiator Task Tag */
+       __be32  rtt;    /* Reference Task Tag */
+       __be32  cmdsn;
+       __be32  exp_statsn;
+       __be32  refcmdsn;
+       __be32  exp_datasn;
+       uint8_t rsvd2[8];
+};
+
+#define ISCSI_FLAG_TASK_MGMT_FUNCTION_MASK     0x7F
+
+/* Function values */
+#define ISCSI_TM_FUNC_ABORT_TASK               1
+#define ISCSI_TM_FUNC_ABORT_TASK_SET           2
+#define ISCSI_TM_FUNC_CLEAR_ACA                        3
+#define ISCSI_TM_FUNC_CLEAR_TASK_SET           4
+#define ISCSI_TM_FUNC_LOGICAL_UNIT_RESET       5
+#define ISCSI_TM_FUNC_TARGET_WARM_RESET                6
+#define ISCSI_TM_FUNC_TARGET_COLD_RESET                7
+#define ISCSI_TM_FUNC_TASK_REASSIGN            8
+
+/* SCSI Task Management Response Header */
+struct iscsi_tm_rsp {
+       uint8_t opcode;
+       uint8_t flags;
+       uint8_t response;       /* see Response values below */
+       uint8_t qualifier;
+       uint8_t hlength;
+       uint8_t dlength[3];
+       uint8_t rsvd2[8];
+       __be32  itt;    /* Initiator Task Tag */
+       __be32  rtt;    /* Reference Task Tag */
+       __be32  statsn;
+       __be32  exp_cmdsn;
+       __be32  max_cmdsn;
+       uint8_t rsvd3[12];
+};
+
+/* Response values */
+#define SCSI_TCP_TM_RESP_COMPLETE      0x00
+#define SCSI_TCP_TM_RESP_NO_TASK       0x01
+#define SCSI_TCP_TM_RESP_NO_LUN                0x02
+#define SCSI_TCP_TM_RESP_TASK_ALLEGIANT        0x03
+#define SCSI_TCP_TM_RESP_NO_FAILOVER   0x04
+#define SCSI_TCP_TM_RESP_NOT_SUPPORTED 0x05
+#define SCSI_TCP_TM_RESP_AUTH_FAILED   0x06
+#define SCSI_TCP_TM_RESP_REJECTED      0xff
+
+/* Ready To Transfer Header */
+struct iscsi_r2t_rsp {
+       uint8_t opcode;
+       uint8_t flags;
+       uint8_t rsvd2[2];
+       uint8_t hlength;
+       uint8_t dlength[3];
+       uint8_t lun[8];
+       __be32  itt;    /* Initiator Task Tag */
+       __be32  ttt;    /* Target Transfer Tag */
+       __be32  statsn;
+       __be32  exp_cmdsn;
+       __be32  max_cmdsn;
+       __be32  r2tsn;
+       __be32  data_offset;
+       __be32  data_length;
+};
+
+/* SCSI Data Hdr */
+struct iscsi_data {
+       uint8_t opcode;
+       uint8_t flags;
+       uint8_t rsvd2[2];
+       uint8_t rsvd3;
+       uint8_t dlength[3];
+       uint8_t lun[8];
+       __be32  itt;
+       __be32  ttt;
+       __be32  rsvd4;
+       __be32  exp_statsn;
+       __be32  rsvd5;
+       __be32  datasn;
+       __be32  offset;
+       __be32  rsvd6;
+       /* Payload */
+};
+
+/* SCSI Data Response Hdr */
+struct iscsi_data_rsp {
+       uint8_t opcode;
+       uint8_t flags;
+       uint8_t rsvd2;
+       uint8_t cmd_status;
+       uint8_t hlength;
+       uint8_t dlength[3];
+       uint8_t lun[8];
+       __be32  itt;
+       __be32  ttt;
+       __be32  statsn;
+       __be32  exp_cmdsn;
+       __be32  max_cmdsn;
+       __be32  datasn;
+       __be32  offset;
+       __be32  residual_count;
+};
+
+/* Data Response PDU flags */
+#define ISCSI_FLAG_DATA_ACK            0x40
+#define ISCSI_FLAG_DATA_OVERFLOW       0x04
+#define ISCSI_FLAG_DATA_UNDERFLOW      0x02
+#define ISCSI_FLAG_DATA_STATUS         0x01
+
+/* Text Header */
+struct iscsi_text {
+       uint8_t opcode;
+       uint8_t flags;
+       uint8_t rsvd2[2];
+       uint8_t hlength;
+       uint8_t dlength[3];
+       uint8_t rsvd4[8];
+       __be32  itt;
+       __be32  ttt;
+       __be32  cmdsn;
+       __be32  exp_statsn;
+       uint8_t rsvd5[16];
+       /* Text - key=value pairs */
+};
+
+#define ISCSI_FLAG_TEXT_CONTINUE       0x40
+
+/* Text Response Header */
+struct iscsi_text_rsp {
+       uint8_t opcode;
+       uint8_t flags;
+       uint8_t rsvd2[2];
+       uint8_t hlength;
+       uint8_t dlength[3];
+       uint8_t rsvd4[8];
+       __be32  itt;
+       __be32  ttt;
+       __be32  statsn;
+       __be32  exp_cmdsn;
+       __be32  max_cmdsn;
+       uint8_t rsvd5[12];
+       /* Text Response - key:value pairs */
+};
+
+/* Login Header */
+struct iscsi_login {
+       uint8_t opcode;
+       uint8_t flags;
+       uint8_t max_version;    /* Max. version supported */
+       uint8_t min_version;    /* Min. version supported */
+       uint8_t hlength;
+       uint8_t dlength[3];
+       uint8_t isid[6];        /* Initiator Session ID */
+       __be16  tsih;   /* Target Session Handle */
+       __be32  itt;    /* Initiator Task Tag */
+       __be16  cid;
+       __be16  rsvd3;
+       __be32  cmdsn;
+       __be32  exp_statsn;
+       uint8_t rsvd5[16];
+};
+
+/* Login PDU flags */
+#define ISCSI_FLAG_LOGIN_TRANSIT               0x80
+#define ISCSI_FLAG_LOGIN_CONTINUE              0x40
+#define ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK    0x0C    /* 2 bits */
+#define ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK       0x03    /* 2 bits */
+
+#define ISCSI_LOGIN_CURRENT_STAGE(flags) \
+       ((flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2)
+#define ISCSI_LOGIN_NEXT_STAGE(flags) \
+       (flags & ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK)
+
+/* Login Response Header */
+struct iscsi_login_rsp {
+       uint8_t opcode;
+       uint8_t flags;
+       uint8_t max_version;    /* Max. version supported */
+       uint8_t active_version; /* Active version */
+       uint8_t hlength;
+       uint8_t dlength[3];
+       uint8_t isid[6];        /* Initiator Session ID */
+       __be16  tsih;   /* Target Session Handle */
+       __be32  itt;    /* Initiator Task Tag */
+       __be32  rsvd3;
+       __be32  statsn;
+       __be32  exp_cmdsn;
+       __be32  max_cmdsn;
+       uint8_t status_class;   /* see Login RSP ststus classes below */
+       uint8_t status_detail;  /* see Login RSP Status details below */
+       uint8_t rsvd4[10];
+};
+
+/* Login stage (phase) codes for CSG, NSG */
+#define ISCSI_INITIAL_LOGIN_STAGE              -1
+#define ISCSI_SECURITY_NEGOTIATION_STAGE       0
+#define ISCSI_OP_PARMS_NEGOTIATION_STAGE       1
+#define ISCSI_FULL_FEATURE_PHASE               3
+
+/* Login Status response classes */
+#define ISCSI_STATUS_CLS_SUCCESS               0x00
+#define ISCSI_STATUS_CLS_REDIRECT              0x01
+#define ISCSI_STATUS_CLS_INITIATOR_ERR         0x02
+#define ISCSI_STATUS_CLS_TARGET_ERR            0x03
+
+/* Login Status response detail codes */
+/* Class-0 (Success) */
+#define ISCSI_LOGIN_STATUS_ACCEPT              0x00
+
+/* Class-1 (Redirection) */
+#define ISCSI_LOGIN_STATUS_TGT_MOVED_TEMP      0x01
+#define ISCSI_LOGIN_STATUS_TGT_MOVED_PERM      0x02
+
+/* Class-2 (Initiator Error) */
+#define ISCSI_LOGIN_STATUS_INIT_ERR            0x00
+#define ISCSI_LOGIN_STATUS_AUTH_FAILED         0x01
+#define ISCSI_LOGIN_STATUS_TGT_FORBIDDEN       0x02
+#define ISCSI_LOGIN_STATUS_TGT_NOT_FOUND       0x03
+#define ISCSI_LOGIN_STATUS_TGT_REMOVED         0x04
+#define ISCSI_LOGIN_STATUS_NO_VERSION          0x05
+#define ISCSI_LOGIN_STATUS_ISID_ERROR          0x06
+#define ISCSI_LOGIN_STATUS_MISSING_FIELDS      0x07
+#define ISCSI_LOGIN_STATUS_CONN_ADD_FAILED     0x08
+#define ISCSI_LOGIN_STATUS_NO_SESSION_TYPE     0x09
+#define ISCSI_LOGIN_STATUS_NO_SESSION          0x0a
+#define ISCSI_LOGIN_STATUS_INVALID_REQUEST     0x0b
+
+/* Class-3 (Target Error) */
+#define ISCSI_LOGIN_STATUS_TARGET_ERROR                0x00
+#define ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE     0x01
+#define ISCSI_LOGIN_STATUS_NO_RESOURCES                0x02
+
+/* Logout Header */
+struct iscsi_logout {
+       uint8_t opcode;
+       uint8_t flags;
+       uint8_t rsvd1[2];
+       uint8_t hlength;
+       uint8_t dlength[3];
+       uint8_t rsvd2[8];
+       __be32  itt;    /* Initiator Task Tag */
+       __be16  cid;
+       uint8_t rsvd3[2];
+       __be32  cmdsn;
+       __be32  exp_statsn;
+       uint8_t rsvd4[16];
+};
+
+/* Logout PDU flags */
+#define ISCSI_FLAG_LOGOUT_REASON_MASK  0x7F
+
+/* logout reason_code values */
+
+#define ISCSI_LOGOUT_REASON_CLOSE_SESSION      0
+#define ISCSI_LOGOUT_REASON_CLOSE_CONNECTION   1
+#define ISCSI_LOGOUT_REASON_RECOVERY           2
+#define ISCSI_LOGOUT_REASON_AEN_REQUEST                3
+
+/* Logout Response Header */
+struct iscsi_logout_rsp {
+       uint8_t opcode;
+       uint8_t flags;
+       uint8_t response;       /* see Logout response values below */
+       uint8_t rsvd2;
+       uint8_t hlength;
+       uint8_t dlength[3];
+       uint8_t rsvd3[8];
+       __be32  itt;    /* Initiator Task Tag */
+       __be32  rsvd4;
+       __be32  statsn;
+       __be32  exp_cmdsn;
+       __be32  max_cmdsn;
+       __be32  rsvd5;
+       __be16  t2wait;
+       __be16  t2retain;
+       __be32  rsvd6;
+};
+
+/* logout response status values */
+
+#define ISCSI_LOGOUT_SUCCESS                   0
+#define ISCSI_LOGOUT_CID_NOT_FOUND             1
+#define ISCSI_LOGOUT_RECOVERY_UNSUPPORTED      2
+#define ISCSI_LOGOUT_CLEANUP_FAILED            3
+
+/* SNACK Header */
+struct iscsi_snack {
+       uint8_t opcode;
+       uint8_t flags;
+       uint8_t rsvd2[14];
+       __be32  itt;
+       __be32  begrun;
+       __be32  runlength;
+       __be32  exp_statsn;
+       __be32  rsvd3;
+       __be32  exp_datasn;
+       uint8_t rsvd6[8];
+};
+
+/* SNACK PDU flags */
+#define ISCSI_FLAG_SNACK_TYPE_MASK     0x0F    /* 4 bits */
+
+/* Reject Message Header */
+struct iscsi_reject {
+       uint8_t opcode;
+       uint8_t flags;
+       uint8_t reason;
+       uint8_t rsvd2;
+       uint8_t rsvd3;
+       uint8_t dlength[3];
+       uint8_t rsvd4[16];
+       __be32  statsn;
+       __be32  exp_cmdsn;
+       __be32  max_cmdsn;
+       __be32  datasn;
+       uint8_t rsvd5[8];
+       /* Text - Rejected hdr */
+};
+
+/* Reason for Reject */
+#define CMD_BEFORE_LOGIN       1
+#define DATA_DIGEST_ERROR      2
+#define DATA_SNACK_REJECT      3
+#define ISCSI_PROTOCOL_ERROR   4
+#define CMD_NOT_SUPPORTED      5
+#define IMM_CMD_REJECT         6
+#define TASK_IN_PROGRESS       7
+#define INVALID_SNACK          8
+#define BOOKMARK_REJECTED      9
+#define BOOKMARK_NO_RESOURCES  10
+#define NEGOTIATION_RESET      11
+
+/* Max. number of Key=Value pairs in a text message */
+#define MAX_KEY_VALUE_PAIRS    8192
+
+/* maximum length for text keys/values */
+#define KEY_MAXLEN             64
+#define VALUE_MAXLEN           255
+#define TARGET_NAME_MAXLEN     VALUE_MAXLEN
+
+#define DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH   8192
+
+/************************* RFC 3720 End *****************************/
+
+#endif /* ISCSI_PROTO_H */
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