[net-next-2.6.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>
#include <scsi/scsi.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[SCSI_MAX_VARLEN_CDB_SIZE - 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

#define ISCSI_TM_FUNC_VALUE(hdr) ((hdr)->flags & ISCSI_FLAG_TM_FUNC_MASK)

/* 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	24	#include <linux/types.h>
30e9ba9f	25	#include <scsi/scsi.h>
26974789	26
39e84790 AA	27	#define ISCSI_DRAFT20_VERSION 0x00
	28
	29	/* default iSCSI listen port for incoming connections */
	30	#define ISCSI_LISTEN_PORT 3260
	31
	32	/* Padding word length */
004d6530	33	#define ISCSI_PAD_LEN 4
39e84790 AA	34
	35	/*
	36	* useful common(control and data pathes) macro
	37	*/
	38	#define ntoh24(p) (((p)[0] << 16) \| ((p)[1] << 8) \| ((p)[2]))
	39	#define hton24(p, v) { \
	40	p[0] = (((v) >> 16) & 0xFF); \
	41	p[1] = (((v) >> 8) & 0xFF); \
	42	p[2] = ((v) & 0xFF); \
	43	}
	44	#define zero_data(p) {p[0]=0;p[1]=0;p[2]=0;}
	45
b4377356 AV	46	/* initiator tags; opaque for target */
	47	typedef uint32_t __bitwise__ itt_t;
	48	/* below makes sense only for initiator that created this tag */
8b1d0343 MC	49	#define build_itt(itt, age) ((__force itt_t)\
8b1d0343 MC	50	((itt) \| ((age) << ISCSI_AGE_SHIFT)))
b4377356 AV	51	#define get_itt(itt) ((__force uint32_t)(itt_t)(itt) & ISCSI_ITT_MASK)
	52	#define RESERVED_ITT ((__force itt_t)0xffffffff)
	53
39e84790 AA	54	/*
	55	* iSCSI Template Message Header
	56	*/
	57	struct iscsi_hdr {
	58	uint8_t opcode;
	59	uint8_t flags; /* Final bit */
	60	uint8_t rsvd2[2];
	61	uint8_t hlength; /* AHSs total length */
	62	uint8_t dlength[3]; /* Data length */
	63	uint8_t lun[8];
b4377356	64	itt_t itt; /* Initiator Task Tag, opaque for target */
39e84790 AA	65	__be32 ttt; /* Target Task Tag */
	66	__be32 statsn;
	67	__be32 exp_statsn;
baebc497 MC	68	__be32 max_statsn;
baebc497 MC	69	uint8_t other[12];
39e84790 AA	70	};
	71
	72	/*********************** RFC 3720 Begin ***************************/
	73
	74	#define ISCSI_RESERVED_TAG 0xffffffff
	75
	76	/* Opcode encoding bits */
	77	#define ISCSI_OP_RETRY 0x80
	78	#define ISCSI_OP_IMMEDIATE 0x40
	79	#define ISCSI_OPCODE_MASK 0x3F
	80
	81	/* Initiator Opcode values */
	82	#define ISCSI_OP_NOOP_OUT 0x00
	83	#define ISCSI_OP_SCSI_CMD 0x01
	84	#define ISCSI_OP_SCSI_TMFUNC 0x02
	85	#define ISCSI_OP_LOGIN 0x03
	86	#define ISCSI_OP_TEXT 0x04
	87	#define ISCSI_OP_SCSI_DATA_OUT 0x05
	88	#define ISCSI_OP_LOGOUT 0x06
	89	#define ISCSI_OP_SNACK 0x10
	90
baebc497 MC	91	#define ISCSI_OP_VENDOR1_CMD 0x1c
	92	#define ISCSI_OP_VENDOR2_CMD 0x1d
	93	#define ISCSI_OP_VENDOR3_CMD 0x1e
	94	#define ISCSI_OP_VENDOR4_CMD 0x1f
	95
39e84790 AA	96	/* Target Opcode values */
	97	#define ISCSI_OP_NOOP_IN 0x20
	98	#define ISCSI_OP_SCSI_CMD_RSP 0x21
	99	#define ISCSI_OP_SCSI_TMFUNC_RSP 0x22
	100	#define ISCSI_OP_LOGIN_RSP 0x23
	101	#define ISCSI_OP_TEXT_RSP 0x24
	102	#define ISCSI_OP_SCSI_DATA_IN 0x25
	103	#define ISCSI_OP_LOGOUT_RSP 0x26
	104	#define ISCSI_OP_R2T 0x31
	105	#define ISCSI_OP_ASYNC_EVENT 0x32
	106	#define ISCSI_OP_REJECT 0x3f
	107
baebc497 MC	108	struct iscsi_ahs_hdr {
	109	__be16 ahslength;
	110	uint8_t ahstype;
	111	uint8_t ahspec[5];
	112	};
	113
	114	#define ISCSI_AHSTYPE_CDB 1
	115	#define ISCSI_AHSTYPE_RLENGTH 2
38d1c069	116	#define ISCSI_CDB_SIZE 16
baebc497	117
39e84790 AA	118	/* iSCSI PDU Header */
	119	struct iscsi_cmd {
	120	uint8_t opcode;
	121	uint8_t flags;
baebc497	122	__be16 rsvd2;
39e84790 AA	123	uint8_t hlength;
	124	uint8_t dlength[3];
	125	uint8_t lun[8];
b4377356	126	itt_t itt; /* Initiator Task Tag */
39e84790 AA	127	__be32 data_length;
	128	__be32 cmdsn;
	129	__be32 exp_statsn;
38d1c069	130	uint8_t cdb[ISCSI_CDB_SIZE]; /* SCSI Command Block */
39e84790 AA	131	/* Additional Data (Command Dependent) */
	132	};
	133
	134	/* Command PDU flags */
	135	#define ISCSI_FLAG_CMD_FINAL 0x80
	136	#define ISCSI_FLAG_CMD_READ 0x40
	137	#define ISCSI_FLAG_CMD_WRITE 0x20
	138	#define ISCSI_FLAG_CMD_ATTR_MASK 0x07 /* 3 bits */
	139
	140	/* SCSI Command Attribute values */
	141	#define ISCSI_ATTR_UNTAGGED 0
	142	#define ISCSI_ATTR_SIMPLE 1
	143	#define ISCSI_ATTR_ORDERED 2
	144	#define ISCSI_ATTR_HEAD_OF_QUEUE 3
	145	#define ISCSI_ATTR_ACA 4
	146
baebc497 MC	147	struct iscsi_rlength_ahdr {
	148	__be16 ahslength;
	149	uint8_t ahstype;
	150	uint8_t reserved;
	151	__be32 read_length;
	152	};
	153
004d6530 BH	154	/* Extended CDB AHS */
	155	struct iscsi_ecdb_ahdr {
	156	__be16 ahslength; /* CDB length - 15, including reserved byte */
	157	uint8_t ahstype;
	158	uint8_t reserved;
38d1c069	159	/* 4-byte aligned extended CDB spillover */
30e9ba9f	160	uint8_t ecdb[SCSI_MAX_VARLEN_CDB_SIZE - ISCSI_CDB_SIZE];
004d6530 BH	161	};
004d6530 BH	162
39e84790 AA	163	/* SCSI Response Header */
	164	struct iscsi_cmd_rsp {
	165	uint8_t opcode;
	166	uint8_t flags;
	167	uint8_t response;
	168	uint8_t cmd_status;
	169	uint8_t hlength;
	170	uint8_t dlength[3];
	171	uint8_t rsvd[8];
b4377356	172	itt_t itt; /* Initiator Task Tag */
39e84790 AA	173	__be32 rsvd1;
	174	__be32 statsn;
	175	__be32 exp_cmdsn;
	176	__be32 max_cmdsn;
	177	__be32 exp_datasn;
	178	__be32 bi_residual_count;
	179	__be32 residual_count;
	180	/* Response or Sense Data (optional) */
	181	};
	182
	183	/* Command Response PDU flags */
	184	#define ISCSI_FLAG_CMD_BIDI_OVERFLOW 0x10
	185	#define ISCSI_FLAG_CMD_BIDI_UNDERFLOW 0x08
	186	#define ISCSI_FLAG_CMD_OVERFLOW 0x04
	187	#define ISCSI_FLAG_CMD_UNDERFLOW 0x02
	188
	189	/* iSCSI Status values. Valid if Rsp Selector bit is not set */
	190	#define ISCSI_STATUS_CMD_COMPLETED 0
	191	#define ISCSI_STATUS_TARGET_FAILURE 1
	192	#define ISCSI_STATUS_SUBSYS_FAILURE 2
	193
	194	/* Asynchronous Event Header */
	195	struct iscsi_async {
	196	uint8_t opcode;
	197	uint8_t flags;
	198	uint8_t rsvd2[2];
	199	uint8_t rsvd3;
	200	uint8_t dlength[3];
	201	uint8_t lun[8];
	202	uint8_t rsvd4[8];
	203	__be32 statsn;
	204	__be32 exp_cmdsn;
	205	__be32 max_cmdsn;
	206	uint8_t async_event;
	207	uint8_t async_vcode;
	208	__be16 param1;
	209	__be16 param2;
	210	__be16 param3;
	211	uint8_t rsvd5[4];
	212	};
	213
	214	/* iSCSI Event Codes */
	215	#define ISCSI_ASYNC_MSG_SCSI_EVENT 0
	216	#define ISCSI_ASYNC_MSG_REQUEST_LOGOUT 1
	217	#define ISCSI_ASYNC_MSG_DROPPING_CONNECTION 2
	218	#define ISCSI_ASYNC_MSG_DROPPING_ALL_CONNECTIONS 3
	219	#define ISCSI_ASYNC_MSG_PARAM_NEGOTIATION 4
	220	#define ISCSI_ASYNC_MSG_VENDOR_SPECIFIC 255
	221
	222	/* NOP-Out Message */
	223	struct iscsi_nopout {
	224	uint8_t opcode;
	225	uint8_t flags;
	226	__be16 rsvd2;
	227	uint8_t rsvd3;
	228	uint8_t dlength[3];
	229	uint8_t lun[8];
b4377356	230	itt_t itt; /* Initiator Task Tag */
39e84790 AA	231	__be32 ttt; /* Target Transfer Tag */
	232	__be32 cmdsn;
	233	__be32 exp_statsn;
	234	uint8_t rsvd4[16];
	235	};
	236
	237	/* NOP-In Message */
	238	struct iscsi_nopin {
	239	uint8_t opcode;
	240	uint8_t flags;
	241	__be16 rsvd2;
	242	uint8_t rsvd3;
	243	uint8_t dlength[3];
	244	uint8_t lun[8];
b4377356	245	itt_t itt; /* Initiator Task Tag */
39e84790 AA	246	__be32 ttt; /* Target Transfer Tag */
	247	__be32 statsn;
	248	__be32 exp_cmdsn;
	249	__be32 max_cmdsn;
	250	uint8_t rsvd4[12];
	251	};
	252
	253	/* SCSI Task Management Message Header */
	254	struct iscsi_tm {
	255	uint8_t opcode;
	256	uint8_t flags;
	257	uint8_t rsvd1[2];
	258	uint8_t hlength;
	259	uint8_t dlength[3];
	260	uint8_t lun[8];
b4377356 AV	261	itt_t itt; /* Initiator Task Tag */
b4377356 AV	262	itt_t rtt; /* Reference Task Tag */
39e84790 AA	263	__be32 cmdsn;
	264	__be32 exp_statsn;
	265	__be32 refcmdsn;
	266	__be32 exp_datasn;
	267	uint8_t rsvd2[8];
	268	};
	269
baebc497	270	#define ISCSI_FLAG_TM_FUNC_MASK 0x7F
39e84790 AA	271
	272	/* Function values */
	273	#define ISCSI_TM_FUNC_ABORT_TASK 1
	274	#define ISCSI_TM_FUNC_ABORT_TASK_SET 2
	275	#define ISCSI_TM_FUNC_CLEAR_ACA 3
	276	#define ISCSI_TM_FUNC_CLEAR_TASK_SET 4
	277	#define ISCSI_TM_FUNC_LOGICAL_UNIT_RESET 5
	278	#define ISCSI_TM_FUNC_TARGET_WARM_RESET 6
	279	#define ISCSI_TM_FUNC_TARGET_COLD_RESET 7
	280	#define ISCSI_TM_FUNC_TASK_REASSIGN 8
	281
5d12c05e MC	282	#define ISCSI_TM_FUNC_VALUE(hdr) ((hdr)->flags & ISCSI_FLAG_TM_FUNC_MASK)
5d12c05e MC	283
39e84790 AA	284	/* SCSI Task Management Response Header */
	285	struct iscsi_tm_rsp {
	286	uint8_t opcode;
	287	uint8_t flags;
	288	uint8_t response; /* see Response values below */
	289	uint8_t qualifier;
	290	uint8_t hlength;
	291	uint8_t dlength[3];
	292	uint8_t rsvd2[8];
b4377356 AV	293	itt_t itt; /* Initiator Task Tag */
b4377356 AV	294	itt_t rtt; /* Reference Task Tag */
39e84790 AA	295	__be32 statsn;
	296	__be32 exp_cmdsn;
	297	__be32 max_cmdsn;
	298	uint8_t rsvd3[12];
	299	};
	300
	301	/* Response values */
baebc497 MC	302	#define ISCSI_TMF_RSP_COMPLETE 0x00
	303	#define ISCSI_TMF_RSP_NO_TASK 0x01
	304	#define ISCSI_TMF_RSP_NO_LUN 0x02
	305	#define ISCSI_TMF_RSP_TASK_ALLEGIANT 0x03
	306	#define ISCSI_TMF_RSP_NO_FAILOVER 0x04
	307	#define ISCSI_TMF_RSP_NOT_SUPPORTED 0x05
	308	#define ISCSI_TMF_RSP_AUTH_FAILED 0x06
	309	#define ISCSI_TMF_RSP_REJECTED 0xff
39e84790 AA	310
	311	/* Ready To Transfer Header */
	312	struct iscsi_r2t_rsp {
	313	uint8_t opcode;
	314	uint8_t flags;
	315	uint8_t rsvd2[2];
	316	uint8_t hlength;
	317	uint8_t dlength[3];
	318	uint8_t lun[8];
b4377356	319	itt_t itt; /* Initiator Task Tag */
39e84790 AA	320	__be32 ttt; /* Target Transfer Tag */
	321	__be32 statsn;
	322	__be32 exp_cmdsn;
	323	__be32 max_cmdsn;
	324	__be32 r2tsn;
	325	__be32 data_offset;
	326	__be32 data_length;
	327	};
	328
	329	/* SCSI Data Hdr */
	330	struct iscsi_data {
	331	uint8_t opcode;
	332	uint8_t flags;
	333	uint8_t rsvd2[2];
	334	uint8_t rsvd3;
	335	uint8_t dlength[3];
	336	uint8_t lun[8];
b4377356	337	itt_t itt;
39e84790 AA	338	__be32 ttt;
	339	__be32 rsvd4;
	340	__be32 exp_statsn;
	341	__be32 rsvd5;
	342	__be32 datasn;
	343	__be32 offset;
	344	__be32 rsvd6;
	345	/* Payload */
	346	};
	347
	348	/* SCSI Data Response Hdr */
	349	struct iscsi_data_rsp {
	350	uint8_t opcode;
	351	uint8_t flags;
	352	uint8_t rsvd2;
	353	uint8_t cmd_status;
	354	uint8_t hlength;
	355	uint8_t dlength[3];
	356	uint8_t lun[8];
b4377356	357	itt_t itt;
39e84790 AA	358	__be32 ttt;
	359	__be32 statsn;
	360	__be32 exp_cmdsn;
	361	__be32 max_cmdsn;
	362	__be32 datasn;
	363	__be32 offset;
	364	__be32 residual_count;
	365	};
	366
	367	/* Data Response PDU flags */
	368	#define ISCSI_FLAG_DATA_ACK 0x40
	369	#define ISCSI_FLAG_DATA_OVERFLOW 0x04
	370	#define ISCSI_FLAG_DATA_UNDERFLOW 0x02
	371	#define ISCSI_FLAG_DATA_STATUS 0x01
	372
	373	/* Text Header */
	374	struct iscsi_text {
	375	uint8_t opcode;
	376	uint8_t flags;
	377	uint8_t rsvd2[2];
	378	uint8_t hlength;
	379	uint8_t dlength[3];
	380	uint8_t rsvd4[8];
b4377356	381	itt_t itt;
39e84790 AA	382	__be32 ttt;
	383	__be32 cmdsn;
	384	__be32 exp_statsn;
	385	uint8_t rsvd5[16];
	386	/* Text - key=value pairs */
	387	};
	388
	389	#define ISCSI_FLAG_TEXT_CONTINUE 0x40
	390
	391	/* Text Response Header */
	392	struct iscsi_text_rsp {
	393	uint8_t opcode;
	394	uint8_t flags;
	395	uint8_t rsvd2[2];
	396	uint8_t hlength;
	397	uint8_t dlength[3];
	398	uint8_t rsvd4[8];
b4377356	399	itt_t itt;
39e84790 AA	400	__be32 ttt;
	401	__be32 statsn;
	402	__be32 exp_cmdsn;
	403	__be32 max_cmdsn;
	404	uint8_t rsvd5[12];
	405	/* Text Response - key:value pairs */
	406	};
	407
	408	/* Login Header */
	409	struct iscsi_login {
	410	uint8_t opcode;
	411	uint8_t flags;
	412	uint8_t max_version; /* Max. version supported */
	413	uint8_t min_version; /* Min. version supported */
	414	uint8_t hlength;
	415	uint8_t dlength[3];
	416	uint8_t isid[6]; /* Initiator Session ID */
	417	__be16 tsih; /* Target Session Handle */
b4377356	418	itt_t itt; /* Initiator Task Tag */
39e84790 AA	419	__be16 cid;
	420	__be16 rsvd3;
	421	__be32 cmdsn;
	422	__be32 exp_statsn;
	423	uint8_t rsvd5[16];
	424	};
	425
	426	/* Login PDU flags */
	427	#define ISCSI_FLAG_LOGIN_TRANSIT 0x80
	428	#define ISCSI_FLAG_LOGIN_CONTINUE 0x40
	429	#define ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK 0x0C /* 2 bits */
	430	#define ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK 0x03 /* 2 bits */
	431
	432	#define ISCSI_LOGIN_CURRENT_STAGE(flags) \
	433	((flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2)
	434	#define ISCSI_LOGIN_NEXT_STAGE(flags) \
	435	(flags & ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK)
	436
	437	/* Login Response Header */
	438	struct iscsi_login_rsp {
	439	uint8_t opcode;
	440	uint8_t flags;
	441	uint8_t max_version; /* Max. version supported */
	442	uint8_t active_version; /* Active version */
	443	uint8_t hlength;
	444	uint8_t dlength[3];
	445	uint8_t isid[6]; /* Initiator Session ID */
	446	__be16 tsih; /* Target Session Handle */
b4377356	447	itt_t itt; /* Initiator Task Tag */
39e84790 AA	448	__be32 rsvd3;
	449	__be32 statsn;
	450	__be32 exp_cmdsn;
	451	__be32 max_cmdsn;
	452	uint8_t status_class; /* see Login RSP ststus classes below */
	453	uint8_t status_detail; /* see Login RSP Status details below */
	454	uint8_t rsvd4[10];
	455	};
	456
	457	/* Login stage (phase) codes for CSG, NSG */
	458	#define ISCSI_INITIAL_LOGIN_STAGE -1
	459	#define ISCSI_SECURITY_NEGOTIATION_STAGE 0
	460	#define ISCSI_OP_PARMS_NEGOTIATION_STAGE 1
	461	#define ISCSI_FULL_FEATURE_PHASE 3
	462
	463	/* Login Status response classes */
	464	#define ISCSI_STATUS_CLS_SUCCESS 0x00
	465	#define ISCSI_STATUS_CLS_REDIRECT 0x01
	466	#define ISCSI_STATUS_CLS_INITIATOR_ERR 0x02
	467	#define ISCSI_STATUS_CLS_TARGET_ERR 0x03
	468
	469	/* Login Status response detail codes */
	470	/* Class-0 (Success) */
	471	#define ISCSI_LOGIN_STATUS_ACCEPT 0x00
	472
	473	/* Class-1 (Redirection) */
	474	#define ISCSI_LOGIN_STATUS_TGT_MOVED_TEMP 0x01
	475	#define ISCSI_LOGIN_STATUS_TGT_MOVED_PERM 0x02
	476
	477	/* Class-2 (Initiator Error) */
	478	#define ISCSI_LOGIN_STATUS_INIT_ERR 0x00
	479	#define ISCSI_LOGIN_STATUS_AUTH_FAILED 0x01
	480	#define ISCSI_LOGIN_STATUS_TGT_FORBIDDEN 0x02
	481	#define ISCSI_LOGIN_STATUS_TGT_NOT_FOUND 0x03
	482	#define ISCSI_LOGIN_STATUS_TGT_REMOVED 0x04
	483	#define ISCSI_LOGIN_STATUS_NO_VERSION 0x05
	484	#define ISCSI_LOGIN_STATUS_ISID_ERROR 0x06
	485	#define ISCSI_LOGIN_STATUS_MISSING_FIELDS 0x07
	486	#define ISCSI_LOGIN_STATUS_CONN_ADD_FAILED 0x08
	487	#define ISCSI_LOGIN_STATUS_NO_SESSION_TYPE 0x09
	488	#define ISCSI_LOGIN_STATUS_NO_SESSION 0x0a
	489	#define ISCSI_LOGIN_STATUS_INVALID_REQUEST 0x0b
	490
	491	/* Class-3 (Target Error) */
	492	#define ISCSI_LOGIN_STATUS_TARGET_ERROR 0x00
	493	#define ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE 0x01
	494	#define ISCSI_LOGIN_STATUS_NO_RESOURCES 0x02
	495
	496	/* Logout Header */
	497	struct iscsi_logout {
	498	uint8_t opcode;
	499	uint8_t flags;
	500	uint8_t rsvd1[2];
	501	uint8_t hlength;
	502	uint8_t dlength[3];
	503	uint8_t rsvd2[8];
b4377356	504	itt_t itt; /* Initiator Task Tag */
39e84790 AA	505	__be16 cid;
	506	uint8_t rsvd3[2];
	507	__be32 cmdsn;
	508	__be32 exp_statsn;
	509	uint8_t rsvd4[16];
	510	};
	511
	512	/* Logout PDU flags */
	513	#define ISCSI_FLAG_LOGOUT_REASON_MASK 0x7F
	514
	515	/* logout reason_code values */
	516
	517	#define ISCSI_LOGOUT_REASON_CLOSE_SESSION 0
	518	#define ISCSI_LOGOUT_REASON_CLOSE_CONNECTION 1
	519	#define ISCSI_LOGOUT_REASON_RECOVERY 2
	520	#define ISCSI_LOGOUT_REASON_AEN_REQUEST 3
	521
	522	/* Logout Response Header */
	523	struct iscsi_logout_rsp {
	524	uint8_t opcode;
	525	uint8_t flags;
	526	uint8_t response; /* see Logout response values below */
	527	uint8_t rsvd2;
	528	uint8_t hlength;
	529	uint8_t dlength[3];
	530	uint8_t rsvd3[8];
b4377356	531	itt_t itt; /* Initiator Task Tag */
39e84790 AA	532	__be32 rsvd4;
	533	__be32 statsn;
	534	__be32 exp_cmdsn;
	535	__be32 max_cmdsn;
	536	__be32 rsvd5;
	537	__be16 t2wait;
	538	__be16 t2retain;
	539	__be32 rsvd6;
	540	};
	541
	542	/* logout response status values */
	543
	544	#define ISCSI_LOGOUT_SUCCESS 0
	545	#define ISCSI_LOGOUT_CID_NOT_FOUND 1
	546	#define ISCSI_LOGOUT_RECOVERY_UNSUPPORTED 2
	547	#define ISCSI_LOGOUT_CLEANUP_FAILED 3
	548
	549	/* SNACK Header */
	550	struct iscsi_snack {
	551	uint8_t opcode;
	552	uint8_t flags;
	553	uint8_t rsvd2[14];
b4377356	554	itt_t itt;
39e84790 AA	555	__be32 begrun;
	556	__be32 runlength;
	557	__be32 exp_statsn;
	558	__be32 rsvd3;
	559	__be32 exp_datasn;
	560	uint8_t rsvd6[8];
	561	};
	562
	563	/* SNACK PDU flags */
	564	#define ISCSI_FLAG_SNACK_TYPE_MASK 0x0F /* 4 bits */
	565
	566	/* Reject Message Header */
	567	struct iscsi_reject {
	568	uint8_t opcode;
	569	uint8_t flags;
	570	uint8_t reason;
	571	uint8_t rsvd2;
fa0a6957	572	uint8_t hlength;
39e84790	573	uint8_t dlength[3];
fa0a6957 MC	574	uint8_t rsvd3[8];
	575	__be32 ffffffff;
	576	uint8_t rsvd4[4];
39e84790 AA	577	__be32 statsn;
	578	__be32 exp_cmdsn;
	579	__be32 max_cmdsn;
	580	__be32 datasn;
	581	uint8_t rsvd5[8];
	582	/* Text - Rejected hdr */
	583	};
	584
	585	/* Reason for Reject */
fa0a6957 MC	586	#define ISCSI_REASON_CMD_BEFORE_LOGIN 1
	587	#define ISCSI_REASON_DATA_DIGEST_ERROR 2
	588	#define ISCSI_REASON_DATA_SNACK_REJECT 3
	589	#define ISCSI_REASON_PROTOCOL_ERROR 4
	590	#define ISCSI_REASON_CMD_NOT_SUPPORTED 5
	591	#define ISCSI_REASON_IMM_CMD_REJECT 6
	592	#define ISCSI_REASON_TASK_IN_PROGRESS 7
	593	#define ISCSI_REASON_INVALID_SNACK 8
	594	#define ISCSI_REASON_BOOKMARK_INVALID 9
	595	#define ISCSI_REASON_BOOKMARK_NO_RESOURCES 10
	596	#define ISCSI_REASON_NEGOTIATION_RESET 11
39e84790 AA	597
	598	/* Max. number of Key=Value pairs in a text message */
	599	#define MAX_KEY_VALUE_PAIRS 8192
	600
	601	/* maximum length for text keys/values */
	602	#define KEY_MAXLEN 64
	603	#define VALUE_MAXLEN 255
	604	#define TARGET_NAME_MAXLEN VALUE_MAXLEN
	605
bf32ed33 MC	606	#define ISCSI_DEF_MAX_RECV_SEG_LEN 8192
	607	#define ISCSI_MIN_MAX_RECV_SEG_LEN 512
	608	#define ISCSI_MAX_MAX_RECV_SEG_LEN 16777215
	609
	610	#define ISCSI_DEF_FIRST_BURST_LEN 65536
	611	#define ISCSI_MIN_FIRST_BURST_LEN 512
	612	#define ISCSI_MAX_FIRST_BURST_LEN 16777215
	613
	614	#define ISCSI_DEF_MAX_BURST_LEN 262144
	615	#define ISCSI_MIN_MAX_BURST_LEN 512
	616	#define ISCSI_MAX_MAX_BURST_LEN 16777215
39e84790	617
843c0a8a MC	618	#define ISCSI_DEF_TIME2WAIT 2
843c0a8a MC	619
39e84790 AA	620	/*********************** RFC 3720 End ***************************/
	621
	622	#endif /* ISCSI_PROTO_H */