[mirror_ubuntu-bionic-kernel.git] / include / scsi / iscsi_proto.h

/*
 * RFC 3720 (iSCSI) protocol data types
 *
 * Copyright (C) 2005 Dmitry Yusupov
 * Copyright (C) 2005 Alex Aizman
 * maintained by open-iscsi@googlegroups.com
 *
 * 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

#include <linux/types.h>

#define ISCSI_DRAFT20_VERSION	0x00

/* default iSCSI listen port for incoming connections */
#define ISCSI_LISTEN_PORT	3260

/* Padding word length */
#define ISCSI_PAD_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;}

/* initiator tags; opaque for target */
typedef uint32_t __bitwise__ itt_t;
/* below makes sense only for initiator that created this tag */
#define build_itt(itt, age) ((__force itt_t)\
	((itt) | ((age) << ISCSI_AGE_SHIFT)))
#define get_itt(itt) ((__force uint32_t)(itt_t)(itt) & ISCSI_ITT_MASK)
#define RESERVED_ITT ((__force itt_t)0xffffffff)

/*
 * 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];
	itt_t		itt;		/* Initiator Task Tag, opaque for target */
	__be32		ttt;		/* Target Task Tag */
	__be32		statsn;
	__be32		exp_statsn;
	__be32		max_statsn;
	uint8_t		other[12];
};

/************************* 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

#define ISCSI_OP_VENDOR1_CMD		0x1c
#define ISCSI_OP_VENDOR2_CMD		0x1d
#define ISCSI_OP_VENDOR3_CMD		0x1e
#define ISCSI_OP_VENDOR4_CMD		0x1f

/* 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

struct iscsi_ahs_hdr {
	__be16 ahslength;
	uint8_t ahstype;
	uint8_t ahspec[5];
};

#define ISCSI_AHSTYPE_CDB		1
#define ISCSI_AHSTYPE_RLENGTH		2
#define ISCSI_CDB_SIZE			16

/* iSCSI PDU Header */
struct iscsi_cmd {
	uint8_t opcode;
	uint8_t flags;
	__be16 rsvd2;
	uint8_t hlength;
	uint8_t dlength[3];
	uint8_t lun[8];
	itt_t	 itt;	/* Initiator Task Tag */
	__be32 data_length;
	__be32 cmdsn;
	__be32 exp_statsn;
	uint8_t cdb[ISCSI_CDB_SIZE];	/* 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

struct iscsi_rlength_ahdr {
	__be16 ahslength;
	uint8_t ahstype;
	uint8_t reserved;
	__be32 read_length;
};

/* Extended CDB AHS */
struct iscsi_ecdb_ahdr {
	__be16 ahslength;	/* CDB length - 15, including reserved byte */
	uint8_t ahstype;
	uint8_t reserved;
	/* 4-byte aligned extended CDB spillover */
	uint8_t ecdb[260 - ISCSI_CDB_SIZE];
};

/* 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];
	itt_t	 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];
	itt_t	 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];
	itt_t	 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];
	itt_t	 itt;	/* Initiator Task Tag */
	itt_t	 rtt;	/* Reference Task Tag */
	__be32	cmdsn;
	__be32	exp_statsn;
	__be32	refcmdsn;
	__be32	exp_datasn;
	uint8_t rsvd2[8];
};

#define ISCSI_FLAG_TM_FUNC_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];
	itt_t	 itt;	/* Initiator Task Tag */
	itt_t	 rtt;	/* Reference Task Tag */
	__be32	statsn;
	__be32	exp_cmdsn;
	__be32	max_cmdsn;
	uint8_t rsvd3[12];
};

/* Response values */
#define ISCSI_TMF_RSP_COMPLETE		0x00
#define ISCSI_TMF_RSP_NO_TASK		0x01
#define ISCSI_TMF_RSP_NO_LUN		0x02
#define ISCSI_TMF_RSP_TASK_ALLEGIANT	0x03
#define ISCSI_TMF_RSP_NO_FAILOVER	0x04
#define ISCSI_TMF_RSP_NOT_SUPPORTED	0x05
#define ISCSI_TMF_RSP_AUTH_FAILED	0x06
#define ISCSI_TMF_RSP_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];
	itt_t	 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];
	itt_t	 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];
	itt_t	 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];
	itt_t	 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];
	itt_t	 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 */
	itt_t	 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 */
	itt_t	 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];
	itt_t	 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];
	itt_t	 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];
	itt_t	 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 hlength;
	uint8_t dlength[3];
	uint8_t rsvd3[8];
	__be32  ffffffff;
	uint8_t rsvd4[4];
	__be32	statsn;
	__be32	exp_cmdsn;
	__be32	max_cmdsn;
	__be32	datasn;
	uint8_t rsvd5[8];
	/* Text - Rejected hdr */
};

/* Reason for Reject */
#define ISCSI_REASON_CMD_BEFORE_LOGIN	1
#define ISCSI_REASON_DATA_DIGEST_ERROR	2
#define ISCSI_REASON_DATA_SNACK_REJECT	3
#define ISCSI_REASON_PROTOCOL_ERROR	4
#define ISCSI_REASON_CMD_NOT_SUPPORTED	5
#define ISCSI_REASON_IMM_CMD_REJECT		6
#define ISCSI_REASON_TASK_IN_PROGRESS	7
#define ISCSI_REASON_INVALID_SNACK		8
#define ISCSI_REASON_BOOKMARK_INVALID	9
#define ISCSI_REASON_BOOKMARK_NO_RESOURCES	10
#define ISCSI_REASON_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 ISCSI_DEF_MAX_RECV_SEG_LEN		8192
#define ISCSI_MIN_MAX_RECV_SEG_LEN		512
#define ISCSI_MAX_MAX_RECV_SEG_LEN		16777215

#define ISCSI_DEF_FIRST_BURST_LEN		65536
#define ISCSI_MIN_FIRST_BURST_LEN		512
#define ISCSI_MAX_FIRST_BURST_LEN		16777215

#define ISCSI_DEF_MAX_BURST_LEN			262144
#define ISCSI_MIN_MAX_BURST_LEN			512
#define ISCSI_MAX_MAX_BURST_LEN			16777215

#define ISCSI_DEF_TIME2WAIT			2

/************************* RFC 3720 End *****************************/

#endif /* ISCSI_PROTO_H */
Commit	Line	Data
39e84790 AA	1	/*
	2	* RFC 3720 (iSCSI) protocol data types
	3	*
	4	* Copyright (C) 2005 Dmitry Yusupov
	5	* Copyright (C) 2005 Alex Aizman
	6	* maintained by open-iscsi@googlegroups.com
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published
	10	* by the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful, but
	14	* WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	* General Public License for more details.
	17	*
	18	* See the file COPYING included with this distribution for more details.
	19	*/
	20
	21	#ifndef ISCSI_PROTO_H
	22	#define ISCSI_PROTO_H
	23
26974789 MC	24	#include <linux/types.h>
26974789 MC	25
39e84790 AA	26	#define ISCSI_DRAFT20_VERSION 0x00
	27
	28	/* default iSCSI listen port for incoming connections */
	29	#define ISCSI_LISTEN_PORT 3260
	30
	31	/* Padding word length */
004d6530	32	#define ISCSI_PAD_LEN 4
39e84790 AA	33
	34	/*
	35	* useful common(control and data pathes) macro
	36	*/
	37	#define ntoh24(p) (((p)[0] << 16) \| ((p)[1] << 8) \| ((p)[2]))
	38	#define hton24(p, v) { \
	39	p[0] = (((v) >> 16) & 0xFF); \
	40	p[1] = (((v) >> 8) & 0xFF); \
	41	p[2] = ((v) & 0xFF); \
	42	}
	43	#define zero_data(p) {p[0]=0;p[1]=0;p[2]=0;}
	44
b4377356 AV	45	/* initiator tags; opaque for target */
	46	typedef uint32_t __bitwise__ itt_t;
	47	/* below makes sense only for initiator that created this tag */
8b1d0343 MC	48	#define build_itt(itt, age) ((__force itt_t)\
8b1d0343 MC	49	((itt) \| ((age) << ISCSI_AGE_SHIFT)))
b4377356 AV	50	#define get_itt(itt) ((__force uint32_t)(itt_t)(itt) & ISCSI_ITT_MASK)
	51	#define RESERVED_ITT ((__force itt_t)0xffffffff)
	52
39e84790 AA	53	/*
	54	* iSCSI Template Message Header
	55	*/
	56	struct iscsi_hdr {
	57	uint8_t opcode;
	58	uint8_t flags; /* Final bit */
	59	uint8_t rsvd2[2];
	60	uint8_t hlength; /* AHSs total length */
	61	uint8_t dlength[3]; /* Data length */
	62	uint8_t lun[8];
b4377356	63	itt_t itt; /* Initiator Task Tag, opaque for target */
39e84790 AA	64	__be32 ttt; /* Target Task Tag */
	65	__be32 statsn;
	66	__be32 exp_statsn;
baebc497 MC	67	__be32 max_statsn;
baebc497 MC	68	uint8_t other[12];
39e84790 AA	69	};
	70
	71	/*********************** RFC 3720 Begin ***************************/
	72
	73	#define ISCSI_RESERVED_TAG 0xffffffff
	74
	75	/* Opcode encoding bits */
	76	#define ISCSI_OP_RETRY 0x80
	77	#define ISCSI_OP_IMMEDIATE 0x40
	78	#define ISCSI_OPCODE_MASK 0x3F
	79
	80	/* Initiator Opcode values */
	81	#define ISCSI_OP_NOOP_OUT 0x00
	82	#define ISCSI_OP_SCSI_CMD 0x01
	83	#define ISCSI_OP_SCSI_TMFUNC 0x02
	84	#define ISCSI_OP_LOGIN 0x03
	85	#define ISCSI_OP_TEXT 0x04
	86	#define ISCSI_OP_SCSI_DATA_OUT 0x05
	87	#define ISCSI_OP_LOGOUT 0x06
	88	#define ISCSI_OP_SNACK 0x10
	89
baebc497 MC	90	#define ISCSI_OP_VENDOR1_CMD 0x1c
	91	#define ISCSI_OP_VENDOR2_CMD 0x1d
	92	#define ISCSI_OP_VENDOR3_CMD 0x1e
	93	#define ISCSI_OP_VENDOR4_CMD 0x1f
	94
39e84790 AA	95	/* Target Opcode values */
	96	#define ISCSI_OP_NOOP_IN 0x20
	97	#define ISCSI_OP_SCSI_CMD_RSP 0x21
	98	#define ISCSI_OP_SCSI_TMFUNC_RSP 0x22
	99	#define ISCSI_OP_LOGIN_RSP 0x23
	100	#define ISCSI_OP_TEXT_RSP 0x24
	101	#define ISCSI_OP_SCSI_DATA_IN 0x25
	102	#define ISCSI_OP_LOGOUT_RSP 0x26
	103	#define ISCSI_OP_R2T 0x31
	104	#define ISCSI_OP_ASYNC_EVENT 0x32
	105	#define ISCSI_OP_REJECT 0x3f
	106
baebc497 MC	107	struct iscsi_ahs_hdr {
	108	__be16 ahslength;
	109	uint8_t ahstype;
	110	uint8_t ahspec[5];
	111	};
	112
	113	#define ISCSI_AHSTYPE_CDB 1
	114	#define ISCSI_AHSTYPE_RLENGTH 2
38d1c069	115	#define ISCSI_CDB_SIZE 16
baebc497	116
39e84790 AA	117	/* iSCSI PDU Header */
	118	struct iscsi_cmd {
	119	uint8_t opcode;
	120	uint8_t flags;
baebc497	121	__be16 rsvd2;
39e84790 AA	122	uint8_t hlength;
	123	uint8_t dlength[3];
	124	uint8_t lun[8];
b4377356	125	itt_t itt; /* Initiator Task Tag */
39e84790 AA	126	__be32 data_length;
	127	__be32 cmdsn;
	128	__be32 exp_statsn;
38d1c069	129	uint8_t cdb[ISCSI_CDB_SIZE]; /* SCSI Command Block */
39e84790 AA	130	/* Additional Data (Command Dependent) */
	131	};
	132
	133	/* Command PDU flags */
	134	#define ISCSI_FLAG_CMD_FINAL 0x80
	135	#define ISCSI_FLAG_CMD_READ 0x40
	136	#define ISCSI_FLAG_CMD_WRITE 0x20
	137	#define ISCSI_FLAG_CMD_ATTR_MASK 0x07 /* 3 bits */
	138
	139	/* SCSI Command Attribute values */
	140	#define ISCSI_ATTR_UNTAGGED 0
	141	#define ISCSI_ATTR_SIMPLE 1
	142	#define ISCSI_ATTR_ORDERED 2
	143	#define ISCSI_ATTR_HEAD_OF_QUEUE 3
	144	#define ISCSI_ATTR_ACA 4
	145
baebc497 MC	146	struct iscsi_rlength_ahdr {
	147	__be16 ahslength;
	148	uint8_t ahstype;
	149	uint8_t reserved;
	150	__be32 read_length;
	151	};
	152
004d6530 BH	153	/* Extended CDB AHS */
	154	struct iscsi_ecdb_ahdr {
	155	__be16 ahslength; /* CDB length - 15, including reserved byte */
	156	uint8_t ahstype;
	157	uint8_t reserved;
38d1c069 BH	158	/* 4-byte aligned extended CDB spillover */
38d1c069 BH	159	uint8_t ecdb[260 - ISCSI_CDB_SIZE];
004d6530 BH	160	};
004d6530 BH	161
39e84790 AA	162	/* SCSI Response Header */
	163	struct iscsi_cmd_rsp {
	164	uint8_t opcode;
	165	uint8_t flags;
	166	uint8_t response;
	167	uint8_t cmd_status;
	168	uint8_t hlength;
	169	uint8_t dlength[3];
	170	uint8_t rsvd[8];
b4377356	171	itt_t itt; /* Initiator Task Tag */
39e84790 AA	172	__be32 rsvd1;
	173	__be32 statsn;
	174	__be32 exp_cmdsn;
	175	__be32 max_cmdsn;
	176	__be32 exp_datasn;
	177	__be32 bi_residual_count;
	178	__be32 residual_count;
	179	/* Response or Sense Data (optional) */
	180	};
	181
	182	/* Command Response PDU flags */
	183	#define ISCSI_FLAG_CMD_BIDI_OVERFLOW 0x10
	184	#define ISCSI_FLAG_CMD_BIDI_UNDERFLOW 0x08
	185	#define ISCSI_FLAG_CMD_OVERFLOW 0x04
	186	#define ISCSI_FLAG_CMD_UNDERFLOW 0x02
	187
	188	/* iSCSI Status values. Valid if Rsp Selector bit is not set */
	189	#define ISCSI_STATUS_CMD_COMPLETED 0
	190	#define ISCSI_STATUS_TARGET_FAILURE 1
	191	#define ISCSI_STATUS_SUBSYS_FAILURE 2
	192
	193	/* Asynchronous Event Header */
	194	struct iscsi_async {
	195	uint8_t opcode;
	196	uint8_t flags;
	197	uint8_t rsvd2[2];
	198	uint8_t rsvd3;
	199	uint8_t dlength[3];
	200	uint8_t lun[8];
	201	uint8_t rsvd4[8];
	202	__be32 statsn;
	203	__be32 exp_cmdsn;
	204	__be32 max_cmdsn;
	205	uint8_t async_event;
	206	uint8_t async_vcode;
	207	__be16 param1;
	208	__be16 param2;
	209	__be16 param3;
	210	uint8_t rsvd5[4];
	211	};
	212
	213	/* iSCSI Event Codes */
	214	#define ISCSI_ASYNC_MSG_SCSI_EVENT 0
	215	#define ISCSI_ASYNC_MSG_REQUEST_LOGOUT 1
	216	#define ISCSI_ASYNC_MSG_DROPPING_CONNECTION 2
	217	#define ISCSI_ASYNC_MSG_DROPPING_ALL_CONNECTIONS 3
	218	#define ISCSI_ASYNC_MSG_PARAM_NEGOTIATION 4
	219	#define ISCSI_ASYNC_MSG_VENDOR_SPECIFIC 255
	220
	221	/* NOP-Out Message */
	222	struct iscsi_nopout {
	223	uint8_t opcode;
	224	uint8_t flags;
	225	__be16 rsvd2;
	226	uint8_t rsvd3;
	227	uint8_t dlength[3];
	228	uint8_t lun[8];
b4377356	229	itt_t itt; /* Initiator Task Tag */
39e84790 AA	230	__be32 ttt; /* Target Transfer Tag */
	231	__be32 cmdsn;
	232	__be32 exp_statsn;
	233	uint8_t rsvd4[16];
	234	};
	235
	236	/* NOP-In Message */
	237	struct iscsi_nopin {
	238	uint8_t opcode;
	239	uint8_t flags;
	240	__be16 rsvd2;
	241	uint8_t rsvd3;
	242	uint8_t dlength[3];
	243	uint8_t lun[8];
b4377356	244	itt_t itt; /* Initiator Task Tag */
39e84790 AA	245	__be32 ttt; /* Target Transfer Tag */
	246	__be32 statsn;
	247	__be32 exp_cmdsn;
	248	__be32 max_cmdsn;
	249	uint8_t rsvd4[12];
	250	};
	251
	252	/* SCSI Task Management Message Header */
	253	struct iscsi_tm {
	254	uint8_t opcode;
	255	uint8_t flags;
	256	uint8_t rsvd1[2];
	257	uint8_t hlength;
	258	uint8_t dlength[3];
	259	uint8_t lun[8];
b4377356 AV	260	itt_t itt; /* Initiator Task Tag */
b4377356 AV	261	itt_t rtt; /* Reference Task Tag */
39e84790 AA	262	__be32 cmdsn;
	263	__be32 exp_statsn;
	264	__be32 refcmdsn;
	265	__be32 exp_datasn;
	266	uint8_t rsvd2[8];
	267	};
	268
baebc497	269	#define ISCSI_FLAG_TM_FUNC_MASK 0x7F
39e84790 AA	270
	271	/* Function values */
	272	#define ISCSI_TM_FUNC_ABORT_TASK 1
	273	#define ISCSI_TM_FUNC_ABORT_TASK_SET 2
	274	#define ISCSI_TM_FUNC_CLEAR_ACA 3
	275	#define ISCSI_TM_FUNC_CLEAR_TASK_SET 4
	276	#define ISCSI_TM_FUNC_LOGICAL_UNIT_RESET 5
	277	#define ISCSI_TM_FUNC_TARGET_WARM_RESET 6
	278	#define ISCSI_TM_FUNC_TARGET_COLD_RESET 7
	279	#define ISCSI_TM_FUNC_TASK_REASSIGN 8
	280
	281	/* SCSI Task Management Response Header */
	282	struct iscsi_tm_rsp {
	283	uint8_t opcode;
	284	uint8_t flags;
	285	uint8_t response; /* see Response values below */
	286	uint8_t qualifier;
	287	uint8_t hlength;
	288	uint8_t dlength[3];
	289	uint8_t rsvd2[8];
b4377356 AV	290	itt_t itt; /* Initiator Task Tag */
b4377356 AV	291	itt_t rtt; /* Reference Task Tag */
39e84790 AA	292	__be32 statsn;
	293	__be32 exp_cmdsn;
	294	__be32 max_cmdsn;
	295	uint8_t rsvd3[12];
	296	};
	297
	298	/* Response values */
baebc497 MC	299	#define ISCSI_TMF_RSP_COMPLETE 0x00
	300	#define ISCSI_TMF_RSP_NO_TASK 0x01
	301	#define ISCSI_TMF_RSP_NO_LUN 0x02
	302	#define ISCSI_TMF_RSP_TASK_ALLEGIANT 0x03
	303	#define ISCSI_TMF_RSP_NO_FAILOVER 0x04
	304	#define ISCSI_TMF_RSP_NOT_SUPPORTED 0x05
	305	#define ISCSI_TMF_RSP_AUTH_FAILED 0x06
	306	#define ISCSI_TMF_RSP_REJECTED 0xff
39e84790 AA	307
	308	/* Ready To Transfer Header */
	309	struct iscsi_r2t_rsp {
	310	uint8_t opcode;
	311	uint8_t flags;
	312	uint8_t rsvd2[2];
	313	uint8_t hlength;
	314	uint8_t dlength[3];
	315	uint8_t lun[8];
b4377356	316	itt_t itt; /* Initiator Task Tag */
39e84790 AA	317	__be32 ttt; /* Target Transfer Tag */
	318	__be32 statsn;
	319	__be32 exp_cmdsn;
	320	__be32 max_cmdsn;
	321	__be32 r2tsn;
	322	__be32 data_offset;
	323	__be32 data_length;
	324	};
	325
	326	/* SCSI Data Hdr */
	327	struct iscsi_data {
	328	uint8_t opcode;
	329	uint8_t flags;
	330	uint8_t rsvd2[2];
	331	uint8_t rsvd3;
	332	uint8_t dlength[3];
	333	uint8_t lun[8];
b4377356	334	itt_t itt;
39e84790 AA	335	__be32 ttt;
	336	__be32 rsvd4;
	337	__be32 exp_statsn;
	338	__be32 rsvd5;
	339	__be32 datasn;
	340	__be32 offset;
	341	__be32 rsvd6;
	342	/* Payload */
	343	};
	344
	345	/* SCSI Data Response Hdr */
	346	struct iscsi_data_rsp {
	347	uint8_t opcode;
	348	uint8_t flags;
	349	uint8_t rsvd2;
	350	uint8_t cmd_status;
	351	uint8_t hlength;
	352	uint8_t dlength[3];
	353	uint8_t lun[8];
b4377356	354	itt_t itt;
39e84790 AA	355	__be32 ttt;
	356	__be32 statsn;
	357	__be32 exp_cmdsn;
	358	__be32 max_cmdsn;
	359	__be32 datasn;
	360	__be32 offset;
	361	__be32 residual_count;
	362	};
	363
	364	/* Data Response PDU flags */
	365	#define ISCSI_FLAG_DATA_ACK 0x40
	366	#define ISCSI_FLAG_DATA_OVERFLOW 0x04
	367	#define ISCSI_FLAG_DATA_UNDERFLOW 0x02
	368	#define ISCSI_FLAG_DATA_STATUS 0x01
	369
	370	/* Text Header */
	371	struct iscsi_text {
	372	uint8_t opcode;
	373	uint8_t flags;
	374	uint8_t rsvd2[2];
	375	uint8_t hlength;
	376	uint8_t dlength[3];
	377	uint8_t rsvd4[8];
b4377356	378	itt_t itt;
39e84790 AA	379	__be32 ttt;
	380	__be32 cmdsn;
	381	__be32 exp_statsn;
	382	uint8_t rsvd5[16];
	383	/* Text - key=value pairs */
	384	};
	385
	386	#define ISCSI_FLAG_TEXT_CONTINUE 0x40
	387
	388	/* Text Response Header */
	389	struct iscsi_text_rsp {
	390	uint8_t opcode;
	391	uint8_t flags;
	392	uint8_t rsvd2[2];
	393	uint8_t hlength;
	394	uint8_t dlength[3];
	395	uint8_t rsvd4[8];
b4377356	396	itt_t itt;
39e84790 AA	397	__be32 ttt;
	398	__be32 statsn;
	399	__be32 exp_cmdsn;
	400	__be32 max_cmdsn;
	401	uint8_t rsvd5[12];
	402	/* Text Response - key:value pairs */
	403	};
	404
	405	/* Login Header */
	406	struct iscsi_login {
	407	uint8_t opcode;
	408	uint8_t flags;
	409	uint8_t max_version; /* Max. version supported */
	410	uint8_t min_version; /* Min. version supported */
	411	uint8_t hlength;
	412	uint8_t dlength[3];
	413	uint8_t isid[6]; /* Initiator Session ID */
	414	__be16 tsih; /* Target Session Handle */
b4377356	415	itt_t itt; /* Initiator Task Tag */
39e84790 AA	416	__be16 cid;
	417	__be16 rsvd3;
	418	__be32 cmdsn;
	419	__be32 exp_statsn;
	420	uint8_t rsvd5[16];
	421	};
	422
	423	/* Login PDU flags */
	424	#define ISCSI_FLAG_LOGIN_TRANSIT 0x80
	425	#define ISCSI_FLAG_LOGIN_CONTINUE 0x40
	426	#define ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK 0x0C /* 2 bits */
	427	#define ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK 0x03 /* 2 bits */
	428
	429	#define ISCSI_LOGIN_CURRENT_STAGE(flags) \
	430	((flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2)
	431	#define ISCSI_LOGIN_NEXT_STAGE(flags) \
	432	(flags & ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK)
	433
	434	/* Login Response Header */
	435	struct iscsi_login_rsp {
	436	uint8_t opcode;
	437	uint8_t flags;
	438	uint8_t max_version; /* Max. version supported */
	439	uint8_t active_version; /* Active version */
	440	uint8_t hlength;
	441	uint8_t dlength[3];
	442	uint8_t isid[6]; /* Initiator Session ID */
	443	__be16 tsih; /* Target Session Handle */
b4377356	444	itt_t itt; /* Initiator Task Tag */
39e84790 AA	445	__be32 rsvd3;
	446	__be32 statsn;
	447	__be32 exp_cmdsn;
	448	__be32 max_cmdsn;
	449	uint8_t status_class; /* see Login RSP ststus classes below */
	450	uint8_t status_detail; /* see Login RSP Status details below */
	451	uint8_t rsvd4[10];
	452	};
	453
	454	/* Login stage (phase) codes for CSG, NSG */
	455	#define ISCSI_INITIAL_LOGIN_STAGE -1
	456	#define ISCSI_SECURITY_NEGOTIATION_STAGE 0
	457	#define ISCSI_OP_PARMS_NEGOTIATION_STAGE 1
	458	#define ISCSI_FULL_FEATURE_PHASE 3
	459
	460	/* Login Status response classes */
	461	#define ISCSI_STATUS_CLS_SUCCESS 0x00
	462	#define ISCSI_STATUS_CLS_REDIRECT 0x01
	463	#define ISCSI_STATUS_CLS_INITIATOR_ERR 0x02
	464	#define ISCSI_STATUS_CLS_TARGET_ERR 0x03
	465
	466	/* Login Status response detail codes */
	467	/* Class-0 (Success) */
	468	#define ISCSI_LOGIN_STATUS_ACCEPT 0x00
	469
	470	/* Class-1 (Redirection) */
	471	#define ISCSI_LOGIN_STATUS_TGT_MOVED_TEMP 0x01
	472	#define ISCSI_LOGIN_STATUS_TGT_MOVED_PERM 0x02
	473
	474	/* Class-2 (Initiator Error) */
	475	#define ISCSI_LOGIN_STATUS_INIT_ERR 0x00
	476	#define ISCSI_LOGIN_STATUS_AUTH_FAILED 0x01
	477	#define ISCSI_LOGIN_STATUS_TGT_FORBIDDEN 0x02
	478	#define ISCSI_LOGIN_STATUS_TGT_NOT_FOUND 0x03
	479	#define ISCSI_LOGIN_STATUS_TGT_REMOVED 0x04
	480	#define ISCSI_LOGIN_STATUS_NO_VERSION 0x05
	481	#define ISCSI_LOGIN_STATUS_ISID_ERROR 0x06
	482	#define ISCSI_LOGIN_STATUS_MISSING_FIELDS 0x07
	483	#define ISCSI_LOGIN_STATUS_CONN_ADD_FAILED 0x08
	484	#define ISCSI_LOGIN_STATUS_NO_SESSION_TYPE 0x09
	485	#define ISCSI_LOGIN_STATUS_NO_SESSION 0x0a
	486	#define ISCSI_LOGIN_STATUS_INVALID_REQUEST 0x0b
	487
	488	/* Class-3 (Target Error) */
	489	#define ISCSI_LOGIN_STATUS_TARGET_ERROR 0x00
	490	#define ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE 0x01
	491	#define ISCSI_LOGIN_STATUS_NO_RESOURCES 0x02
	492
	493	/* Logout Header */
	494	struct iscsi_logout {
	495	uint8_t opcode;
	496	uint8_t flags;
	497	uint8_t rsvd1[2];
	498	uint8_t hlength;
	499	uint8_t dlength[3];
	500	uint8_t rsvd2[8];
b4377356	501	itt_t itt; /* Initiator Task Tag */
39e84790 AA	502	__be16 cid;
	503	uint8_t rsvd3[2];
	504	__be32 cmdsn;
	505	__be32 exp_statsn;
	506	uint8_t rsvd4[16];
	507	};
	508
	509	/* Logout PDU flags */
	510	#define ISCSI_FLAG_LOGOUT_REASON_MASK 0x7F
	511
	512	/* logout reason_code values */
	513
	514	#define ISCSI_LOGOUT_REASON_CLOSE_SESSION 0
	515	#define ISCSI_LOGOUT_REASON_CLOSE_CONNECTION 1
	516	#define ISCSI_LOGOUT_REASON_RECOVERY 2
	517	#define ISCSI_LOGOUT_REASON_AEN_REQUEST 3
	518
	519	/* Logout Response Header */
	520	struct iscsi_logout_rsp {
	521	uint8_t opcode;
	522	uint8_t flags;
	523	uint8_t response; /* see Logout response values below */
	524	uint8_t rsvd2;
	525	uint8_t hlength;
	526	uint8_t dlength[3];
	527	uint8_t rsvd3[8];
b4377356	528	itt_t itt; /* Initiator Task Tag */
39e84790 AA	529	__be32 rsvd4;
	530	__be32 statsn;
	531	__be32 exp_cmdsn;
	532	__be32 max_cmdsn;
	533	__be32 rsvd5;
	534	__be16 t2wait;
	535	__be16 t2retain;
	536	__be32 rsvd6;
	537	};
	538
	539	/* logout response status values */
	540
	541	#define ISCSI_LOGOUT_SUCCESS 0
	542	#define ISCSI_LOGOUT_CID_NOT_FOUND 1
	543	#define ISCSI_LOGOUT_RECOVERY_UNSUPPORTED 2
	544	#define ISCSI_LOGOUT_CLEANUP_FAILED 3
	545
	546	/* SNACK Header */
	547	struct iscsi_snack {
	548	uint8_t opcode;
	549	uint8_t flags;
	550	uint8_t rsvd2[14];
b4377356	551	itt_t itt;
39e84790 AA	552	__be32 begrun;
	553	__be32 runlength;
	554	__be32 exp_statsn;
	555	__be32 rsvd3;
	556	__be32 exp_datasn;
	557	uint8_t rsvd6[8];
	558	};
	559
	560	/* SNACK PDU flags */
	561	#define ISCSI_FLAG_SNACK_TYPE_MASK 0x0F /* 4 bits */
	562
	563	/* Reject Message Header */
	564	struct iscsi_reject {
	565	uint8_t opcode;
	566	uint8_t flags;
	567	uint8_t reason;
	568	uint8_t rsvd2;
fa0a6957	569	uint8_t hlength;
39e84790	570	uint8_t dlength[3];
fa0a6957 MC	571	uint8_t rsvd3[8];
	572	__be32 ffffffff;
	573	uint8_t rsvd4[4];
39e84790 AA	574	__be32 statsn;
	575	__be32 exp_cmdsn;
	576	__be32 max_cmdsn;
	577	__be32 datasn;
	578	uint8_t rsvd5[8];
	579	/* Text - Rejected hdr */
	580	};
	581
	582	/* Reason for Reject */
fa0a6957 MC	583	#define ISCSI_REASON_CMD_BEFORE_LOGIN 1
	584	#define ISCSI_REASON_DATA_DIGEST_ERROR 2
	585	#define ISCSI_REASON_DATA_SNACK_REJECT 3
	586	#define ISCSI_REASON_PROTOCOL_ERROR 4
	587	#define ISCSI_REASON_CMD_NOT_SUPPORTED 5
	588	#define ISCSI_REASON_IMM_CMD_REJECT 6
	589	#define ISCSI_REASON_TASK_IN_PROGRESS 7
	590	#define ISCSI_REASON_INVALID_SNACK 8
	591	#define ISCSI_REASON_BOOKMARK_INVALID 9
	592	#define ISCSI_REASON_BOOKMARK_NO_RESOURCES 10
	593	#define ISCSI_REASON_NEGOTIATION_RESET 11
39e84790 AA	594
	595	/* Max. number of Key=Value pairs in a text message */
	596	#define MAX_KEY_VALUE_PAIRS 8192
	597
	598	/* maximum length for text keys/values */
	599	#define KEY_MAXLEN 64
	600	#define VALUE_MAXLEN 255
	601	#define TARGET_NAME_MAXLEN VALUE_MAXLEN
	602
bf32ed33 MC	603	#define ISCSI_DEF_MAX_RECV_SEG_LEN 8192
	604	#define ISCSI_MIN_MAX_RECV_SEG_LEN 512
	605	#define ISCSI_MAX_MAX_RECV_SEG_LEN 16777215
	606
	607	#define ISCSI_DEF_FIRST_BURST_LEN 65536
	608	#define ISCSI_MIN_FIRST_BURST_LEN 512
	609	#define ISCSI_MAX_FIRST_BURST_LEN 16777215
	610
	611	#define ISCSI_DEF_MAX_BURST_LEN 262144
	612	#define ISCSI_MIN_MAX_BURST_LEN 512
	613	#define ISCSI_MAX_MAX_BURST_LEN 16777215
39e84790	614
843c0a8a MC	615	#define ISCSI_DEF_TIME2WAIT 2
843c0a8a MC	616
39e84790 AA	617	/*********************** RFC 3720 End ***************************/
	618
	619	#endif /* ISCSI_PROTO_H */