include/scsi/iscsi_if.h - kernel/msm-4.9 - Gitiles

 /*
  * iSCSI User/Kernel Shares (Defines, Constants, Protocol definitions, etc)
  *
  * 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_IF_H
 #define ISCSI_IF_H

 #include <scsi/iscsi_proto.h>

 #define UEVENT_BASE			10
 #define KEVENT_BASE			100
 #define ISCSI_ERR_BASE			1000

 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_CONN	= UEVENT_BASE + 3,
 	ISCSI_UEVENT_DESTROY_CONN	= UEVENT_BASE + 4,
 	ISCSI_UEVENT_BIND_CONN		= UEVENT_BASE + 5,
 	ISCSI_UEVENT_SET_PARAM		= UEVENT_BASE + 6,
 	ISCSI_UEVENT_START_CONN		= UEVENT_BASE + 7,
 	ISCSI_UEVENT_STOP_CONN		= UEVENT_BASE + 8,
 	ISCSI_UEVENT_SEND_PDU		= UEVENT_BASE + 9,
 	ISCSI_UEVENT_GET_STATS		= UEVENT_BASE + 10,
 	ISCSI_UEVENT_GET_PARAM		= UEVENT_BASE + 11,

 	ISCSI_UEVENT_TRANSPORT_EP_CONNECT	= UEVENT_BASE + 12,
 	ISCSI_UEVENT_TRANSPORT_EP_POLL		= UEVENT_BASE + 13,
 	ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT	= UEVENT_BASE + 14,

 	ISCSI_UEVENT_TGT_DSCVR		= UEVENT_BASE + 15,
 	ISCSI_UEVENT_SET_HOST_PARAM	= UEVENT_BASE + 16,
 	ISCSI_UEVENT_UNBIND_SESSION	= UEVENT_BASE + 17,
 	ISCSI_UEVENT_CREATE_BOUND_SESSION	= UEVENT_BASE + 18,

 	/* up events */
 	ISCSI_KEVENT_RECV_PDU		= KEVENT_BASE + 1,
 	ISCSI_KEVENT_CONN_ERROR		= KEVENT_BASE + 2,
 	ISCSI_KEVENT_IF_ERROR		= KEVENT_BASE + 3,
 	ISCSI_KEVENT_DESTROY_SESSION	= KEVENT_BASE + 4,
 	ISCSI_KEVENT_UNBIND_SESSION	= KEVENT_BASE + 5,
 	ISCSI_KEVENT_CREATE_SESSION	= KEVENT_BASE + 6,
 };

 enum iscsi_tgt_dscvr {
 	ISCSI_TGT_DSCVR_SEND_TARGETS	= 1,
 	ISCSI_TGT_DSCVR_ISNS		= 2,
 	ISCSI_TGT_DSCVR_SLP		= 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;
 			uint16_t	cmds_max;
 			uint16_t	queue_depth;
 		} c_session;
 		struct msg_create_bound_session {
 			uint64_t	ep_handle;
 			uint32_t	initial_cmdsn;
 			uint16_t	cmds_max;
 			uint16_t	queue_depth;
 		} c_bound_session;
 		struct msg_destroy_session {
 			uint32_t	sid;
 		} d_session;
 		struct msg_create_conn {
 			uint32_t	sid;
 			uint32_t	cid;
 		} c_conn;
 		struct msg_bind_conn {
 			uint32_t	sid;
 			uint32_t	cid;
 			uint64_t	transport_eph;
 			uint32_t	is_leading;
 		} b_conn;
 		struct msg_destroy_conn {
 			uint32_t	sid;
 			uint32_t	cid;
 		} d_conn;
 		struct msg_send_pdu {
 			uint32_t	sid;
 			uint32_t	cid;
 			uint32_t	hdr_size;
 			uint32_t	data_size;
 		} send_pdu;
 		struct msg_set_param {
 			uint32_t	sid;
 			uint32_t	cid;
 			uint32_t	param; /* enum iscsi_param */
 			uint32_t	len;
 		} set_param;
 		struct msg_start_conn {
 			uint32_t	sid;
 			uint32_t	cid;
 		} start_conn;
 		struct msg_stop_conn {
 			uint32_t	sid;
 			uint32_t	cid;
 			uint64_t	conn_handle;
 			uint32_t	flag;
 		} stop_conn;
 		struct msg_get_stats {
 			uint32_t	sid;
 			uint32_t	cid;
 		} get_stats;
 		struct msg_transport_connect {
 			uint32_t	non_blocking;
 		} ep_connect;
 		struct msg_transport_poll {
 			uint64_t	ep_handle;
 			uint32_t	timeout_ms;
 		} ep_poll;
 		struct msg_transport_disconnect {
 			uint64_t	ep_handle;
 		} ep_disconnect;
 		struct msg_tgt_dscvr {
 			enum iscsi_tgt_dscvr	type;
 			uint32_t	host_no;
 			/*
  			 * enable = 1 to establish a new connection
 			 * with the server. enable = 0 to disconnect
 			 * from the server. Used primarily to switch
 			 * from one iSNS server to another.
 			 */
 			uint32_t	enable;
 		} tgt_dscvr;
 		struct msg_set_host_param {
 			uint32_t	host_no;
 			uint32_t	param; /* enum iscsi_host_param */
 			uint32_t	len;
 		} set_host_param;
 	} u;
 	union {
 		/* messages k -> u */
 		int			retcode;
 		struct msg_create_session_ret {
 			uint32_t	sid;
 			uint32_t	host_no;
 		} c_session_ret;
 		struct msg_create_conn_ret {
 			uint32_t	sid;
 			uint32_t	cid;
 		} c_conn_ret;
 		struct msg_unbind_session {
 			uint32_t	sid;
 			uint32_t	host_no;
 		} unbind_session;
 		struct msg_recv_req {
 			uint32_t	sid;
 			uint32_t	cid;
 			uint64_t	recv_handle;
 		} recv_req;
 		struct msg_conn_error {
 			uint32_t	sid;
 			uint32_t	cid;
 			uint32_t	error; /* enum iscsi_err */
 		} connerror;
 		struct msg_session_destroyed {
 			uint32_t	host_no;
 			uint32_t	sid;
 		} d_session;
 		struct msg_transport_connect_ret {
 			uint64_t	handle;
 		} ep_connect_ret;
 	} r;
 } __attribute__ ((aligned (sizeof(uint64_t))));

 /*
  * 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_CONN_FAILED		= ISCSI_ERR_BASE + 11,
 	ISCSI_ERR_R2TSN			= ISCSI_ERR_BASE + 12,
 	ISCSI_ERR_SESSION_FAILED	= ISCSI_ERR_BASE + 13,
 	ISCSI_ERR_HDR_DGST		= ISCSI_ERR_BASE + 14,
 	ISCSI_ERR_DATA_DGST		= ISCSI_ERR_BASE + 15,
 	ISCSI_ERR_PARAM_NOT_FOUND	= ISCSI_ERR_BASE + 16,
 	ISCSI_ERR_NO_SCSI_CMD		= ISCSI_ERR_BASE + 17,
 	ISCSI_ERR_INVALID_HOST		= ISCSI_ERR_BASE + 18,
 	ISCSI_ERR_XMIT_FAILED		= ISCSI_ERR_BASE + 19,
 };

 /*
  * iSCSI Parameters (RFC3720)
  */
 enum iscsi_param {
 	/* passed in using netlink set param */
 	ISCSI_PARAM_MAX_RECV_DLENGTH,
 	ISCSI_PARAM_MAX_XMIT_DLENGTH,
 	ISCSI_PARAM_HDRDGST_EN,
 	ISCSI_PARAM_DATADGST_EN,
 	ISCSI_PARAM_INITIAL_R2T_EN,
 	ISCSI_PARAM_MAX_R2T,
 	ISCSI_PARAM_IMM_DATA_EN,
 	ISCSI_PARAM_FIRST_BURST,
 	ISCSI_PARAM_MAX_BURST,
 	ISCSI_PARAM_PDU_INORDER_EN,
 	ISCSI_PARAM_DATASEQ_INORDER_EN,
 	ISCSI_PARAM_ERL,
 	ISCSI_PARAM_IFMARKER_EN,
 	ISCSI_PARAM_OFMARKER_EN,
 	ISCSI_PARAM_EXP_STATSN,
 	ISCSI_PARAM_TARGET_NAME,
 	ISCSI_PARAM_TPGT,
 	ISCSI_PARAM_PERSISTENT_ADDRESS,
 	ISCSI_PARAM_PERSISTENT_PORT,
 	ISCSI_PARAM_SESS_RECOVERY_TMO,

 	/* pased in through bind conn using transport_fd */
 	ISCSI_PARAM_CONN_PORT,
 	ISCSI_PARAM_CONN_ADDRESS,

 	ISCSI_PARAM_USERNAME,
 	ISCSI_PARAM_USERNAME_IN,
 	ISCSI_PARAM_PASSWORD,
 	ISCSI_PARAM_PASSWORD_IN,

 	ISCSI_PARAM_FAST_ABORT,
 	ISCSI_PARAM_ABORT_TMO,
 	ISCSI_PARAM_LU_RESET_TMO,
 	ISCSI_PARAM_HOST_RESET_TMO,

 	ISCSI_PARAM_PING_TMO,
 	ISCSI_PARAM_RECV_TMO,

 	ISCSI_PARAM_IFACE_NAME,
 	ISCSI_PARAM_ISID,
 	ISCSI_PARAM_INITIATOR_NAME,
 	/* must always be last */
 	ISCSI_PARAM_MAX,
 };

 #define ISCSI_MAX_RECV_DLENGTH		(1ULL << ISCSI_PARAM_MAX_RECV_DLENGTH)
 #define ISCSI_MAX_XMIT_DLENGTH		(1ULL << ISCSI_PARAM_MAX_XMIT_DLENGTH)
 #define ISCSI_HDRDGST_EN		(1ULL << ISCSI_PARAM_HDRDGST_EN)
 #define ISCSI_DATADGST_EN		(1ULL << ISCSI_PARAM_DATADGST_EN)
 #define ISCSI_INITIAL_R2T_EN		(1ULL << ISCSI_PARAM_INITIAL_R2T_EN)
 #define ISCSI_MAX_R2T			(1ULL << ISCSI_PARAM_MAX_R2T)
 #define ISCSI_IMM_DATA_EN		(1ULL << ISCSI_PARAM_IMM_DATA_EN)
 #define ISCSI_FIRST_BURST		(1ULL << ISCSI_PARAM_FIRST_BURST)
 #define ISCSI_MAX_BURST			(1ULL << ISCSI_PARAM_MAX_BURST)
 #define ISCSI_PDU_INORDER_EN		(1ULL << ISCSI_PARAM_PDU_INORDER_EN)
 #define ISCSI_DATASEQ_INORDER_EN	(1ULL << ISCSI_PARAM_DATASEQ_INORDER_EN)
 #define ISCSI_ERL			(1ULL << ISCSI_PARAM_ERL)
 #define ISCSI_IFMARKER_EN		(1ULL << ISCSI_PARAM_IFMARKER_EN)
 #define ISCSI_OFMARKER_EN		(1ULL << ISCSI_PARAM_OFMARKER_EN)
 #define ISCSI_EXP_STATSN		(1ULL << ISCSI_PARAM_EXP_STATSN)
 #define ISCSI_TARGET_NAME		(1ULL << ISCSI_PARAM_TARGET_NAME)
 #define ISCSI_TPGT			(1ULL << ISCSI_PARAM_TPGT)
 #define ISCSI_PERSISTENT_ADDRESS	(1ULL << ISCSI_PARAM_PERSISTENT_ADDRESS)
 #define ISCSI_PERSISTENT_PORT		(1ULL << ISCSI_PARAM_PERSISTENT_PORT)
 #define ISCSI_SESS_RECOVERY_TMO		(1ULL << ISCSI_PARAM_SESS_RECOVERY_TMO)
 #define ISCSI_CONN_PORT			(1ULL << ISCSI_PARAM_CONN_PORT)
 #define ISCSI_CONN_ADDRESS		(1ULL << ISCSI_PARAM_CONN_ADDRESS)
 #define ISCSI_USERNAME			(1ULL << ISCSI_PARAM_USERNAME)
 #define ISCSI_USERNAME_IN		(1ULL << ISCSI_PARAM_USERNAME_IN)
 #define ISCSI_PASSWORD			(1ULL << ISCSI_PARAM_PASSWORD)
 #define ISCSI_PASSWORD_IN		(1ULL << ISCSI_PARAM_PASSWORD_IN)
 #define ISCSI_FAST_ABORT		(1ULL << ISCSI_PARAM_FAST_ABORT)
 #define ISCSI_ABORT_TMO			(1ULL << ISCSI_PARAM_ABORT_TMO)
 #define ISCSI_LU_RESET_TMO		(1ULL << ISCSI_PARAM_LU_RESET_TMO)
 #define ISCSI_HOST_RESET_TMO		(1ULL << ISCSI_PARAM_HOST_RESET_TMO)
 #define ISCSI_PING_TMO			(1ULL << ISCSI_PARAM_PING_TMO)
 #define ISCSI_RECV_TMO			(1ULL << ISCSI_PARAM_RECV_TMO)
 #define ISCSI_IFACE_NAME		(1ULL << ISCSI_PARAM_IFACE_NAME)
 #define ISCSI_ISID			(1ULL << ISCSI_PARAM_ISID)
 #define ISCSI_INITIATOR_NAME		(1ULL << ISCSI_PARAM_INITIATOR_NAME)

 /* iSCSI HBA params */
 enum iscsi_host_param {
 	ISCSI_HOST_PARAM_HWADDRESS,
 	ISCSI_HOST_PARAM_INITIATOR_NAME,
 	ISCSI_HOST_PARAM_NETDEV_NAME,
 	ISCSI_HOST_PARAM_IPADDRESS,
 	ISCSI_HOST_PARAM_MAX,
 };

 #define ISCSI_HOST_HWADDRESS		(1ULL << ISCSI_HOST_PARAM_HWADDRESS)
 #define ISCSI_HOST_INITIATOR_NAME	(1ULL << ISCSI_HOST_PARAM_INITIATOR_NAME)
 #define ISCSI_HOST_NETDEV_NAME		(1ULL << ISCSI_HOST_PARAM_NETDEV_NAME)
 #define ISCSI_HOST_IPADDRESS		(1ULL << ISCSI_HOST_PARAM_IPADDRESS)

 #define iscsi_ptr(_handle) ((void*)(unsigned long)_handle)
 #define iscsi_handle(_ptr) ((uint64_t)(unsigned long)_ptr)

 /*
  * 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_CONN		0x40
 #define CAP_TEXT_NEGO		0x80
 #define CAP_MARKERS		0x100
 #define CAP_FW_DB		0x200
 #define CAP_SENDTARGETS_OFFLOAD	0x400	/* offload discovery process */
 #define CAP_DATA_PATH_OFFLOAD	0x800	/* offload entire IO path */
 #define CAP_DIGEST_OFFLOAD	0x1000	/* offload hdr and data digests */
 #define CAP_PADDING_OFFLOAD	0x2000	/* offload padding insertion, removal,
 					 and verification */

 /*
  * These flags describes reason of stop_conn() call
  */
 #define STOP_CONN_TERM		0x1
 #define STOP_CONN_SUSPEND	0x2
 #define STOP_CONN_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(uint64_t))));
 };

 #endif
	/*
	* iSCSI User/Kernel Shares (Defines, Constants, Protocol definitions, etc)
	*
	* 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_IF_H
	#define ISCSI_IF_H

	#include <scsi/iscsi_proto.h>

	#define UEVENT_BASE 10
	#define KEVENT_BASE 100
	#define ISCSI_ERR_BASE 1000

	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_CONN = UEVENT_BASE + 3,
	ISCSI_UEVENT_DESTROY_CONN = UEVENT_BASE + 4,
	ISCSI_UEVENT_BIND_CONN = UEVENT_BASE + 5,
	ISCSI_UEVENT_SET_PARAM = UEVENT_BASE + 6,
	ISCSI_UEVENT_START_CONN = UEVENT_BASE + 7,
	ISCSI_UEVENT_STOP_CONN = UEVENT_BASE + 8,
	ISCSI_UEVENT_SEND_PDU = UEVENT_BASE + 9,
	ISCSI_UEVENT_GET_STATS = UEVENT_BASE + 10,
	ISCSI_UEVENT_GET_PARAM = UEVENT_BASE + 11,

	ISCSI_UEVENT_TRANSPORT_EP_CONNECT = UEVENT_BASE + 12,
	ISCSI_UEVENT_TRANSPORT_EP_POLL = UEVENT_BASE + 13,
	ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT = UEVENT_BASE + 14,

	ISCSI_UEVENT_TGT_DSCVR = UEVENT_BASE + 15,
	ISCSI_UEVENT_SET_HOST_PARAM = UEVENT_BASE + 16,
	ISCSI_UEVENT_UNBIND_SESSION = UEVENT_BASE + 17,
	ISCSI_UEVENT_CREATE_BOUND_SESSION = UEVENT_BASE + 18,

	/* up events */
	ISCSI_KEVENT_RECV_PDU = KEVENT_BASE + 1,
	ISCSI_KEVENT_CONN_ERROR = KEVENT_BASE + 2,
	ISCSI_KEVENT_IF_ERROR = KEVENT_BASE + 3,
	ISCSI_KEVENT_DESTROY_SESSION = KEVENT_BASE + 4,
	ISCSI_KEVENT_UNBIND_SESSION = KEVENT_BASE + 5,
	ISCSI_KEVENT_CREATE_SESSION = KEVENT_BASE + 6,
	};

	enum iscsi_tgt_dscvr {
	ISCSI_TGT_DSCVR_SEND_TARGETS = 1,
	ISCSI_TGT_DSCVR_ISNS = 2,
	ISCSI_TGT_DSCVR_SLP = 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;
	uint16_t cmds_max;
	uint16_t queue_depth;
	} c_session;
	struct msg_create_bound_session {
	uint64_t ep_handle;
	uint32_t initial_cmdsn;
	uint16_t cmds_max;
	uint16_t queue_depth;
	} c_bound_session;
	struct msg_destroy_session {
	uint32_t sid;
	} d_session;
	struct msg_create_conn {
	uint32_t sid;
	uint32_t cid;
	} c_conn;
	struct msg_bind_conn {
	uint32_t sid;
	uint32_t cid;
	uint64_t transport_eph;
	uint32_t is_leading;
	} b_conn;
	struct msg_destroy_conn {
	uint32_t sid;
	uint32_t cid;
	} d_conn;
	struct msg_send_pdu {
	uint32_t sid;
	uint32_t cid;
	uint32_t hdr_size;
	uint32_t data_size;
	} send_pdu;
	struct msg_set_param {
	uint32_t sid;
	uint32_t cid;
	uint32_t param; /* enum iscsi_param */
	uint32_t len;
	} set_param;
	struct msg_start_conn {
	uint32_t sid;
	uint32_t cid;
	} start_conn;
	struct msg_stop_conn {
	uint32_t sid;
	uint32_t cid;
	uint64_t conn_handle;
	uint32_t flag;
	} stop_conn;
	struct msg_get_stats {
	uint32_t sid;
	uint32_t cid;
	} get_stats;
	struct msg_transport_connect {
	uint32_t non_blocking;
	} ep_connect;
	struct msg_transport_poll {
	uint64_t ep_handle;
	uint32_t timeout_ms;
	} ep_poll;
	struct msg_transport_disconnect {
	uint64_t ep_handle;
	} ep_disconnect;
	struct msg_tgt_dscvr {
	enum iscsi_tgt_dscvr type;
	uint32_t host_no;
	/*
	* enable = 1 to establish a new connection
	* with the server. enable = 0 to disconnect
	* from the server. Used primarily to switch
	* from one iSNS server to another.
	*/
	uint32_t enable;
	} tgt_dscvr;
	struct msg_set_host_param {
	uint32_t host_no;
	uint32_t param; /* enum iscsi_host_param */
	uint32_t len;
	} set_host_param;
	} u;
	union {
	/* messages k -> u */
	int retcode;
	struct msg_create_session_ret {
	uint32_t sid;
	uint32_t host_no;
	} c_session_ret;
	struct msg_create_conn_ret {
	uint32_t sid;
	uint32_t cid;
	} c_conn_ret;
	struct msg_unbind_session {
	uint32_t sid;
	uint32_t host_no;
	} unbind_session;
	struct msg_recv_req {
	uint32_t sid;
	uint32_t cid;
	uint64_t recv_handle;
	} recv_req;
	struct msg_conn_error {
	uint32_t sid;
	uint32_t cid;
	uint32_t error; /* enum iscsi_err */
	} connerror;
	struct msg_session_destroyed {
	uint32_t host_no;
	uint32_t sid;
	} d_session;
	struct msg_transport_connect_ret {
	uint64_t handle;
	} ep_connect_ret;
	} r;
	} __attribute__ ((aligned (sizeof(uint64_t))));

	/*
	* 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_CONN_FAILED = ISCSI_ERR_BASE + 11,
	ISCSI_ERR_R2TSN = ISCSI_ERR_BASE + 12,
	ISCSI_ERR_SESSION_FAILED = ISCSI_ERR_BASE + 13,
	ISCSI_ERR_HDR_DGST = ISCSI_ERR_BASE + 14,
	ISCSI_ERR_DATA_DGST = ISCSI_ERR_BASE + 15,
	ISCSI_ERR_PARAM_NOT_FOUND = ISCSI_ERR_BASE + 16,
	ISCSI_ERR_NO_SCSI_CMD = ISCSI_ERR_BASE + 17,
	ISCSI_ERR_INVALID_HOST = ISCSI_ERR_BASE + 18,
	ISCSI_ERR_XMIT_FAILED = ISCSI_ERR_BASE + 19,
	};

	/*
	* iSCSI Parameters (RFC3720)
	*/
	enum iscsi_param {
	/* passed in using netlink set param */
	ISCSI_PARAM_MAX_RECV_DLENGTH,
	ISCSI_PARAM_MAX_XMIT_DLENGTH,
	ISCSI_PARAM_HDRDGST_EN,
	ISCSI_PARAM_DATADGST_EN,
	ISCSI_PARAM_INITIAL_R2T_EN,
	ISCSI_PARAM_MAX_R2T,
	ISCSI_PARAM_IMM_DATA_EN,
	ISCSI_PARAM_FIRST_BURST,
	ISCSI_PARAM_MAX_BURST,
	ISCSI_PARAM_PDU_INORDER_EN,
	ISCSI_PARAM_DATASEQ_INORDER_EN,
	ISCSI_PARAM_ERL,
	ISCSI_PARAM_IFMARKER_EN,
	ISCSI_PARAM_OFMARKER_EN,
	ISCSI_PARAM_EXP_STATSN,
	ISCSI_PARAM_TARGET_NAME,
	ISCSI_PARAM_TPGT,
	ISCSI_PARAM_PERSISTENT_ADDRESS,
	ISCSI_PARAM_PERSISTENT_PORT,
	ISCSI_PARAM_SESS_RECOVERY_TMO,

	/* pased in through bind conn using transport_fd */
	ISCSI_PARAM_CONN_PORT,
	ISCSI_PARAM_CONN_ADDRESS,

	ISCSI_PARAM_USERNAME,
	ISCSI_PARAM_USERNAME_IN,
	ISCSI_PARAM_PASSWORD,
	ISCSI_PARAM_PASSWORD_IN,

	ISCSI_PARAM_FAST_ABORT,
	ISCSI_PARAM_ABORT_TMO,
	ISCSI_PARAM_LU_RESET_TMO,
	ISCSI_PARAM_HOST_RESET_TMO,

	ISCSI_PARAM_PING_TMO,
	ISCSI_PARAM_RECV_TMO,

	ISCSI_PARAM_IFACE_NAME,
	ISCSI_PARAM_ISID,
	ISCSI_PARAM_INITIATOR_NAME,
	/* must always be last */
	ISCSI_PARAM_MAX,
	};

	#define ISCSI_MAX_RECV_DLENGTH (1ULL << ISCSI_PARAM_MAX_RECV_DLENGTH)
	#define ISCSI_MAX_XMIT_DLENGTH (1ULL << ISCSI_PARAM_MAX_XMIT_DLENGTH)
	#define ISCSI_HDRDGST_EN (1ULL << ISCSI_PARAM_HDRDGST_EN)
	#define ISCSI_DATADGST_EN (1ULL << ISCSI_PARAM_DATADGST_EN)
	#define ISCSI_INITIAL_R2T_EN (1ULL << ISCSI_PARAM_INITIAL_R2T_EN)
	#define ISCSI_MAX_R2T (1ULL << ISCSI_PARAM_MAX_R2T)
	#define ISCSI_IMM_DATA_EN (1ULL << ISCSI_PARAM_IMM_DATA_EN)
	#define ISCSI_FIRST_BURST (1ULL << ISCSI_PARAM_FIRST_BURST)
	#define ISCSI_MAX_BURST (1ULL << ISCSI_PARAM_MAX_BURST)
	#define ISCSI_PDU_INORDER_EN (1ULL << ISCSI_PARAM_PDU_INORDER_EN)
	#define ISCSI_DATASEQ_INORDER_EN (1ULL << ISCSI_PARAM_DATASEQ_INORDER_EN)
	#define ISCSI_ERL (1ULL << ISCSI_PARAM_ERL)
	#define ISCSI_IFMARKER_EN (1ULL << ISCSI_PARAM_IFMARKER_EN)
	#define ISCSI_OFMARKER_EN (1ULL << ISCSI_PARAM_OFMARKER_EN)
	#define ISCSI_EXP_STATSN (1ULL << ISCSI_PARAM_EXP_STATSN)
	#define ISCSI_TARGET_NAME (1ULL << ISCSI_PARAM_TARGET_NAME)
	#define ISCSI_TPGT (1ULL << ISCSI_PARAM_TPGT)
	#define ISCSI_PERSISTENT_ADDRESS (1ULL << ISCSI_PARAM_PERSISTENT_ADDRESS)
	#define ISCSI_PERSISTENT_PORT (1ULL << ISCSI_PARAM_PERSISTENT_PORT)
	#define ISCSI_SESS_RECOVERY_TMO (1ULL << ISCSI_PARAM_SESS_RECOVERY_TMO)
	#define ISCSI_CONN_PORT (1ULL << ISCSI_PARAM_CONN_PORT)
	#define ISCSI_CONN_ADDRESS (1ULL << ISCSI_PARAM_CONN_ADDRESS)
	#define ISCSI_USERNAME (1ULL << ISCSI_PARAM_USERNAME)
	#define ISCSI_USERNAME_IN (1ULL << ISCSI_PARAM_USERNAME_IN)
	#define ISCSI_PASSWORD (1ULL << ISCSI_PARAM_PASSWORD)
	#define ISCSI_PASSWORD_IN (1ULL << ISCSI_PARAM_PASSWORD_IN)
	#define ISCSI_FAST_ABORT (1ULL << ISCSI_PARAM_FAST_ABORT)
	#define ISCSI_ABORT_TMO (1ULL << ISCSI_PARAM_ABORT_TMO)
	#define ISCSI_LU_RESET_TMO (1ULL << ISCSI_PARAM_LU_RESET_TMO)
	#define ISCSI_HOST_RESET_TMO (1ULL << ISCSI_PARAM_HOST_RESET_TMO)
	#define ISCSI_PING_TMO (1ULL << ISCSI_PARAM_PING_TMO)
	#define ISCSI_RECV_TMO (1ULL << ISCSI_PARAM_RECV_TMO)
	#define ISCSI_IFACE_NAME (1ULL << ISCSI_PARAM_IFACE_NAME)
	#define ISCSI_ISID (1ULL << ISCSI_PARAM_ISID)
	#define ISCSI_INITIATOR_NAME (1ULL << ISCSI_PARAM_INITIATOR_NAME)

	/* iSCSI HBA params */
	enum iscsi_host_param {
	ISCSI_HOST_PARAM_HWADDRESS,
	ISCSI_HOST_PARAM_INITIATOR_NAME,
	ISCSI_HOST_PARAM_NETDEV_NAME,
	ISCSI_HOST_PARAM_IPADDRESS,
	ISCSI_HOST_PARAM_MAX,
	};

	#define ISCSI_HOST_HWADDRESS (1ULL << ISCSI_HOST_PARAM_HWADDRESS)
	#define ISCSI_HOST_INITIATOR_NAME (1ULL << ISCSI_HOST_PARAM_INITIATOR_NAME)
	#define ISCSI_HOST_NETDEV_NAME (1ULL << ISCSI_HOST_PARAM_NETDEV_NAME)
	#define ISCSI_HOST_IPADDRESS (1ULL << ISCSI_HOST_PARAM_IPADDRESS)

	#define iscsi_ptr(_handle) ((void*)(unsigned long)_handle)
	#define iscsi_handle(_ptr) ((uint64_t)(unsigned long)_ptr)

	/*
	* 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_CONN 0x40
	#define CAP_TEXT_NEGO 0x80
	#define CAP_MARKERS 0x100
	#define CAP_FW_DB 0x200
	#define CAP_SENDTARGETS_OFFLOAD 0x400 /* offload discovery process */
	#define CAP_DATA_PATH_OFFLOAD 0x800 /* offload entire IO path */
	#define CAP_DIGEST_OFFLOAD 0x1000 /* offload hdr and data digests */
	#define CAP_PADDING_OFFLOAD 0x2000 /* offload padding insertion, removal,
	and verification */

	/*
	* These flags describes reason of stop_conn() call
	*/
	#define STOP_CONN_TERM 0x1
	#define STOP_CONN_SUSPEND 0x2
	#define STOP_CONN_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(uint64_t))));
	};

	#endif