[deliverable/linux.git] / include / scsi / iscsi_if.h

/*
 * 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,

	/* up events */
	ISCSI_KEVENT_RECV_PDU		= KEVENT_BASE + 1,
	ISCSI_KEVENT_CONN_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 {
			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;
			uint32_t	transport_fd;
			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;
	} 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_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;
	} 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 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_TARGET_NAME,
	ISCSI_PARAM_TPGT,
	ISCSI_PARAM_PERSISTENT_ADDRESS,
	ISCSI_PARAM_PERSISTENT_PORT,

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

	/* must always be last */
	ISCSI_PARAM_MAX,
};

#define ISCSI_MAX_RECV_DLENGTH		(1 << ISCSI_PARAM_MAX_RECV_DLENGTH)
#define ISCSI_MAX_XMIT_DLENGTH		(1 << ISCSI_PARAM_MAX_XMIT_DLENGTH)
#define ISCSI_HDRDGST_EN		(1 << ISCSI_PARAM_HDRDGST_EN)
#define ISCSI_DATADGST_EN		(1 << ISCSI_PARAM_DATADGST_EN)
#define ISCSI_INITIAL_R2T_EN		(1 << ISCSI_PARAM_INITIAL_R2T_EN)
#define ISCSI_MAX_R2T			(1 << ISCSI_PARAM_MAX_R2T)
#define ISCSI_IMM_DATA_EN		(1 << ISCSI_PARAM_IMM_DATA_EN)
#define ISCSI_FIRST_BURST		(1 << ISCSI_PARAM_FIRST_BURST)
#define ISCSI_MAX_BURST			(1 << ISCSI_PARAM_MAX_BURST)
#define ISCSI_PDU_INORDER_EN		(1 << ISCSI_PARAM_PDU_INORDER_EN)
#define ISCSI_DATASEQ_INORDER_EN	(1 << ISCSI_PARAM_DATASEQ_INORDER_EN)
#define ISCSI_ERL			(1 << ISCSI_PARAM_ERL)
#define ISCSI_IFMARKER_EN		(1 << ISCSI_PARAM_IFMARKER_EN)
#define ISCSI_OFMARKER_EN		(1 << ISCSI_PARAM_OFMARKER_EN)
#define ISCSI_TARGET_NAME		(1 << ISCSI_PARAM_TARGET_NAME)
#define ISCSI_TPGT			(1 << ISCSI_PARAM_TPGT)
#define ISCSI_PERSISTENT_ADDRESS	(1 << ISCSI_PARAM_PERSISTENT_ADDRESS)
#define ISCSI_PERSISTENT_PORT		(1 << ISCSI_PARAM_PERSISTENT_PORT)
#define ISCSI_CONN_PORT			(1 << ISCSI_PARAM_CONN_PORT)
#define ISCSI_CONN_ADDRESS		(1 << ISCSI_PARAM_CONN_ADDRESS)

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

/**
 * iscsi_hostdata - get LLD hostdata from scsi_host
 * @_hostdata: pointer to scsi host's hostdata
 **/
#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_CONN		0x40
#define CAP_TEXT_NEGO		0x80
#define CAP_MARKERS		0x100

/*
 * 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
Commit	Line	Data
39e84790 AA	1	/*
	2	* iSCSI User/Kernel Shares (Defines, Constants, Protocol definitions, etc)
	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_IF_H
	22	#define ISCSI_IF_H
	23
	24	#include <scsi/iscsi_proto.h>
	25
	26	#define UEVENT_BASE 10
	27	#define KEVENT_BASE 100
	28	#define ISCSI_ERR_BASE 1000
	29
	30	enum iscsi_uevent_e {
	31	ISCSI_UEVENT_UNKNOWN = 0,
	32
	33	/* down events */
	34	ISCSI_UEVENT_CREATE_SESSION = UEVENT_BASE + 1,
	35	ISCSI_UEVENT_DESTROY_SESSION = UEVENT_BASE + 2,
	36	ISCSI_UEVENT_CREATE_CONN = UEVENT_BASE + 3,
	37	ISCSI_UEVENT_DESTROY_CONN = UEVENT_BASE + 4,
	38	ISCSI_UEVENT_BIND_CONN = UEVENT_BASE + 5,
	39	ISCSI_UEVENT_SET_PARAM = UEVENT_BASE + 6,
	40	ISCSI_UEVENT_START_CONN = UEVENT_BASE + 7,
	41	ISCSI_UEVENT_STOP_CONN = UEVENT_BASE + 8,
	42	ISCSI_UEVENT_SEND_PDU = UEVENT_BASE + 9,
	43	ISCSI_UEVENT_GET_STATS = UEVENT_BASE + 10,
	44	ISCSI_UEVENT_GET_PARAM = UEVENT_BASE + 11,
	45
	46	/* up events */
	47	ISCSI_KEVENT_RECV_PDU = KEVENT_BASE + 1,
	48	ISCSI_KEVENT_CONN_ERROR = KEVENT_BASE + 2,
	49	ISCSI_KEVENT_IF_ERROR = KEVENT_BASE + 3,
	50	};
	51
	52	struct iscsi_uevent {
	53	uint32_t type; /* k/u events type */
	54	uint32_t iferror; /* carries interface or resource errors */
	55	uint64_t transport_handle;
	56
	57	union {
	58	/* messages u -> k */
	59	struct msg_create_session {
	60	uint32_t initial_cmdsn;
	61	} c_session;
	62	struct msg_destroy_session {
39e84790 AA	63	uint32_t sid;
	64	} d_session;
	65	struct msg_create_conn {
39e84790	66	uint32_t sid;
b5c7a12d	67	uint32_t cid;
39e84790 AA	68	} c_conn;
39e84790 AA	69	struct msg_bind_conn {
b5c7a12d MC	70	uint32_t sid;
b5c7a12d MC	71	uint32_t cid;
39e84790 AA	72	uint32_t transport_fd;
	73	uint32_t is_leading;
	74	} b_conn;
	75	struct msg_destroy_conn {
b5c7a12d	76	uint32_t sid;
39e84790 AA	77	uint32_t cid;
	78	} d_conn;
	79	struct msg_send_pdu {
b5c7a12d MC	80	uint32_t sid;
b5c7a12d MC	81	uint32_t cid;
39e84790 AA	82	uint32_t hdr_size;
39e84790 AA	83	uint32_t data_size;
39e84790 AA	84	} send_pdu;
39e84790 AA	85	struct msg_set_param {
b5c7a12d MC	86	uint32_t sid;
b5c7a12d MC	87	uint32_t cid;
39e84790	88	uint32_t param; /* enum iscsi_param */
fd7255f5	89	uint32_t len;
39e84790 AA	90	} set_param;
39e84790 AA	91	struct msg_start_conn {
b5c7a12d MC	92	uint32_t sid;
b5c7a12d MC	93	uint32_t cid;
39e84790 AA	94	} start_conn;
39e84790 AA	95	struct msg_stop_conn {
b5c7a12d MC	96	uint32_t sid;
b5c7a12d MC	97	uint32_t cid;
39e84790 AA	98	uint64_t conn_handle;
	99	uint32_t flag;
	100	} stop_conn;
	101	struct msg_get_stats {
b5c7a12d MC	102	uint32_t sid;
b5c7a12d MC	103	uint32_t cid;
39e84790 AA	104	} get_stats;
	105	} u;
	106	union {
	107	/* messages k -> u */
39e84790 AA	108	int retcode;
39e84790 AA	109	struct msg_create_session_ret {
39e84790	110	uint32_t sid;
b5c7a12d	111	uint32_t host_no;
39e84790	112	} c_session_ret;
b5c7a12d MC	113	struct msg_create_conn_ret {
	114	uint32_t sid;
	115	uint32_t cid;
	116	} c_conn_ret;
39e84790	117	struct msg_recv_req {
b5c7a12d MC	118	uint32_t sid;
b5c7a12d MC	119	uint32_t cid;
39e84790	120	uint64_t recv_handle;
39e84790 AA	121	} recv_req;
39e84790 AA	122	struct msg_conn_error {
b5c7a12d MC	123	uint32_t sid;
b5c7a12d MC	124	uint32_t cid;
39e84790 AA	125	uint32_t error; /* enum iscsi_err */
	126	} connerror;
	127	} r;
	128	} __attribute__ ((aligned (sizeof(uint64_t))));
	129
	130	/*
	131	* Common error codes
	132	*/
	133	enum iscsi_err {
	134	ISCSI_OK = 0,
	135
	136	ISCSI_ERR_DATASN = ISCSI_ERR_BASE + 1,
	137	ISCSI_ERR_DATA_OFFSET = ISCSI_ERR_BASE + 2,
	138	ISCSI_ERR_MAX_CMDSN = ISCSI_ERR_BASE + 3,
	139	ISCSI_ERR_EXP_CMDSN = ISCSI_ERR_BASE + 4,
	140	ISCSI_ERR_BAD_OPCODE = ISCSI_ERR_BASE + 5,
	141	ISCSI_ERR_DATALEN = ISCSI_ERR_BASE + 6,
	142	ISCSI_ERR_AHSLEN = ISCSI_ERR_BASE + 7,
	143	ISCSI_ERR_PROTO = ISCSI_ERR_BASE + 8,
	144	ISCSI_ERR_LUN = ISCSI_ERR_BASE + 9,
	145	ISCSI_ERR_BAD_ITT = ISCSI_ERR_BASE + 10,
	146	ISCSI_ERR_CONN_FAILED = ISCSI_ERR_BASE + 11,
	147	ISCSI_ERR_R2TSN = ISCSI_ERR_BASE + 12,
	148	ISCSI_ERR_SESSION_FAILED = ISCSI_ERR_BASE + 13,
	149	ISCSI_ERR_HDR_DGST = ISCSI_ERR_BASE + 14,
	150	ISCSI_ERR_DATA_DGST = ISCSI_ERR_BASE + 15,
	151	ISCSI_ERR_PARAM_NOT_FOUND = ISCSI_ERR_BASE + 16
	152	};
	153
	154	/*
	155	* iSCSI Parameters (RFC3720)
	156	*/
	157	enum iscsi_param {
fd7255f5 MC	158	/* passed in using netlink set param */
	159	ISCSI_PARAM_MAX_RECV_DLENGTH,
	160	ISCSI_PARAM_MAX_XMIT_DLENGTH,
	161	ISCSI_PARAM_HDRDGST_EN,
	162	ISCSI_PARAM_DATADGST_EN,
	163	ISCSI_PARAM_INITIAL_R2T_EN,
	164	ISCSI_PARAM_MAX_R2T,
	165	ISCSI_PARAM_IMM_DATA_EN,
	166	ISCSI_PARAM_FIRST_BURST,
	167	ISCSI_PARAM_MAX_BURST,
	168	ISCSI_PARAM_PDU_INORDER_EN,
	169	ISCSI_PARAM_DATASEQ_INORDER_EN,
	170	ISCSI_PARAM_ERL,
	171	ISCSI_PARAM_IFMARKER_EN,
	172	ISCSI_PARAM_OFMARKER_EN,
	173	ISCSI_PARAM_TARGET_NAME,
	174	ISCSI_PARAM_TPGT,
	175	ISCSI_PARAM_PERSISTENT_ADDRESS,
	176	ISCSI_PARAM_PERSISTENT_PORT,
	177
	178	/* pased in through bind conn using transport_fd */
	179	ISCSI_PARAM_CONN_PORT,
	180	ISCSI_PARAM_CONN_ADDRESS,
	181
	182	/* must always be last */
	183	ISCSI_PARAM_MAX,
39e84790	184	};
fd7255f5 MC	185
	186	#define ISCSI_MAX_RECV_DLENGTH (1 << ISCSI_PARAM_MAX_RECV_DLENGTH)
	187	#define ISCSI_MAX_XMIT_DLENGTH (1 << ISCSI_PARAM_MAX_XMIT_DLENGTH)
	188	#define ISCSI_HDRDGST_EN (1 << ISCSI_PARAM_HDRDGST_EN)
	189	#define ISCSI_DATADGST_EN (1 << ISCSI_PARAM_DATADGST_EN)
	190	#define ISCSI_INITIAL_R2T_EN (1 << ISCSI_PARAM_INITIAL_R2T_EN)
	191	#define ISCSI_MAX_R2T (1 << ISCSI_PARAM_MAX_R2T)
	192	#define ISCSI_IMM_DATA_EN (1 << ISCSI_PARAM_IMM_DATA_EN)
	193	#define ISCSI_FIRST_BURST (1 << ISCSI_PARAM_FIRST_BURST)
	194	#define ISCSI_MAX_BURST (1 << ISCSI_PARAM_MAX_BURST)
	195	#define ISCSI_PDU_INORDER_EN (1 << ISCSI_PARAM_PDU_INORDER_EN)
	196	#define ISCSI_DATASEQ_INORDER_EN (1 << ISCSI_PARAM_DATASEQ_INORDER_EN)
	197	#define ISCSI_ERL (1 << ISCSI_PARAM_ERL)
	198	#define ISCSI_IFMARKER_EN (1 << ISCSI_PARAM_IFMARKER_EN)
	199	#define ISCSI_OFMARKER_EN (1 << ISCSI_PARAM_OFMARKER_EN)
	200	#define ISCSI_TARGET_NAME (1 << ISCSI_PARAM_TARGET_NAME)
	201	#define ISCSI_TPGT (1 << ISCSI_PARAM_TPGT)
	202	#define ISCSI_PERSISTENT_ADDRESS (1 << ISCSI_PARAM_PERSISTENT_ADDRESS)
	203	#define ISCSI_PERSISTENT_PORT (1 << ISCSI_PARAM_PERSISTENT_PORT)
	204	#define ISCSI_CONN_PORT (1 << ISCSI_PARAM_CONN_PORT)
	205	#define ISCSI_CONN_ADDRESS (1 << ISCSI_PARAM_CONN_ADDRESS)
39e84790	206
39e84790 AA	207	#define iscsi_ptr(_handle) ((void*)(unsigned long)_handle)
39e84790 AA	208	#define iscsi_handle(_ptr) ((uint64_t)(unsigned long)_ptr)
7b8631b5 MC	209	#define hostdata_session(_hostdata) (iscsi_ptr((unsigned long )_hostdata))
	210
	211	/**
	212	* iscsi_hostdata - get LLD hostdata from scsi_host
	213	* @_hostdata: pointer to scsi host's hostdata
	214	**/
39e84790 AA	215	#define iscsi_hostdata(_hostdata) ((void*)_hostdata + sizeof(unsigned long))
	216
	217	/*
	218	* These flags presents iSCSI Data-Path capabilities.
	219	*/
	220	#define CAP_RECOVERY_L0 0x1
	221	#define CAP_RECOVERY_L1 0x2
	222	#define CAP_RECOVERY_L2 0x4
	223	#define CAP_MULTI_R2T 0x8
	224	#define CAP_HDRDGST 0x10
	225	#define CAP_DATADGST 0x20
	226	#define CAP_MULTI_CONN 0x40
	227	#define CAP_TEXT_NEGO 0x80
	228	#define CAP_MARKERS 0x100
	229
	230	/*
	231	* These flags describes reason of stop_conn() call
	232	*/
	233	#define STOP_CONN_TERM 0x1
	234	#define STOP_CONN_SUSPEND 0x2
	235	#define STOP_CONN_RECOVER 0x3
	236
	237	#define ISCSI_STATS_CUSTOM_MAX 32
	238	#define ISCSI_STATS_CUSTOM_DESC_MAX 64
	239	struct iscsi_stats_custom {
	240	char desc[ISCSI_STATS_CUSTOM_DESC_MAX];
	241	uint64_t value;
	242	};
	243
	244	/*
	245	* struct iscsi_stats - iSCSI Statistics (iSCSI MIB)
	246	*
	247	* Note: this structure contains counters collected on per-connection basis.
	248	*/
	249	struct iscsi_stats {
	250	/* octets */
	251	uint64_t txdata_octets;
	252	uint64_t rxdata_octets;
	253
	254	/* xmit pdus */
	255	uint32_t noptx_pdus;
	256	uint32_t scsicmd_pdus;
	257	uint32_t tmfcmd_pdus;
	258	uint32_t login_pdus;
	259	uint32_t text_pdus;
	260	uint32_t dataout_pdus;
	261	uint32_t logout_pdus;
	262	uint32_t snack_pdus;
	263
	264	/* recv pdus */
	265	uint32_t noprx_pdus;
	266	uint32_t scsirsp_pdus;
	267	uint32_t tmfrsp_pdus;
	268	uint32_t textrsp_pdus;
	269	uint32_t datain_pdus;
	270	uint32_t logoutrsp_pdus;
	271	uint32_t r2t_pdus;
	272	uint32_t async_pdus;
	273	uint32_t rjt_pdus;
	274
	275	/* errors */
	276	uint32_t digest_err;
	277	uint32_t timeout_err;
	278
279	/*
280	* iSCSI Custom Statistics support, i.e. Transport could
281	* extend existing MIB statistics with its own specific statistics
282	* up to ISCSI_STATS_CUSTOM_MAX
283	*/
284	uint32_t custom_length;
285	struct iscsi_stats_custom custom[0]
286	__attribute__ ((aligned (sizeof(uint64_t))));
287	};
288
289	#endif