[linux.git] / include / scsi / libiscsi.h

/*
 * iSCSI lib definitions
 *
 * Copyright (C) 2006 Red Hat, Inc.  All rights reserved.
 * Copyright (C) 2004 - 2006 Mike Christie
 * Copyright (C) 2004 - 2005 Dmitry Yusupov
 * Copyright (C) 2004 - 2005 Alex Aizman
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
#ifndef LIBISCSI_H
#define LIBISCSI_H

#include <linux/types.h>
#include <linux/mutex.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#include <scsi/iscsi_proto.h>
#include <scsi/iscsi_if.h>

struct scsi_transport_template;
struct scsi_device;
struct Scsi_Host;
struct scsi_cmnd;
struct socket;
struct iscsi_transport;
struct iscsi_cls_session;
struct iscsi_cls_conn;
struct iscsi_session;
struct iscsi_nopin;

/* #define DEBUG_SCSI */
#ifdef DEBUG_SCSI
#define debug_scsi(fmt...) printk(KERN_INFO "iscsi: " fmt)
#else
#define debug_scsi(fmt...)
#endif

#define ISCSI_XMIT_CMDS_MAX	128	/* must be power of 2 */
#define ISCSI_MGMT_CMDS_MAX	32	/* must be power of 2 */
#define ISCSI_CONN_MAX			1

#define ISCSI_MGMT_ITT_OFFSET	0xa00

#define ISCSI_DEF_CMD_PER_LUN		32
#define ISCSI_MAX_CMD_PER_LUN		128

/* Task Mgmt states */
#define TMABORT_INITIAL			0x0
#define TMABORT_SUCCESS			0x1
#define TMABORT_FAILED			0x2
#define TMABORT_TIMEDOUT		0x3
#define TMABORT_NOT_FOUND		0x4

/* Connection suspend "bit" */
#define ISCSI_SUSPEND_BIT		1

#define ISCSI_ITT_MASK			(0xfff)
#define ISCSI_CID_SHIFT			12
#define ISCSI_CID_MASK			(0xffff << ISCSI_CID_SHIFT)
#define ISCSI_AGE_SHIFT			28
#define ISCSI_AGE_MASK			(0xf << ISCSI_AGE_SHIFT)

struct iscsi_mgmt_task {
	/*
	 * Becuae LLDs allocate their hdr differently, this is a pointer to
	 * that storage. It must be setup at session creation time.
	 */
	struct iscsi_hdr	*hdr;
	char			*data;		/* mgmt payload */
	unsigned		data_count;	/* counts data to be sent */
	uint32_t		itt;		/* this ITT */
	void			*dd_data;	/* driver/transport data */
	struct list_head	running;
};

enum {
	ISCSI_TASK_COMPLETED,
	ISCSI_TASK_PENDING,
	ISCSI_TASK_RUNNING,
};

struct iscsi_cmd_task {
	/*
	 * Becuae LLDs allocate their hdr differently, this is a pointer to
	 * that storage. It must be setup at session creation time.
	 */
	struct iscsi_cmd	*hdr;
	int			itt;		/* this ITT */

	uint32_t		unsol_datasn;
	unsigned		imm_count;	/* imm-data (bytes)   */
	unsigned		unsol_count;	/* unsolicited (bytes)*/
	/* offset in unsolicited stream (bytes); */
	unsigned		unsol_offset;
	unsigned		data_count;	/* remaining Data-Out */
	struct scsi_cmnd	*sc;		/* associated SCSI cmd*/
	struct iscsi_conn	*conn;		/* used connection    */
	struct iscsi_mgmt_task	*mtask;		/* tmf mtask in progr */

	/* state set/tested under session->lock */
	int			state;
	atomic_t		refcount;
	struct list_head	running;	/* running cmd list */
	void			*dd_data;	/* driver/transport data */
};

struct iscsi_conn {
	struct iscsi_cls_conn	*cls_conn;	/* ptr to class connection */
	void			*dd_data;	/* iscsi_transport data */
	struct iscsi_session	*session;	/* parent session */
	/*
	 * LLDs should set this lock. It protects the transport recv
	 * code
	 */
	rwlock_t		*recv_lock;
	/*
	 * conn_stop() flag: stop to recover, stop to terminate
	 */
        int			stop_stage;

	/* iSCSI connection-wide sequencing */
	uint32_t		exp_statsn;

	/* control data */
	int			id;		/* CID */
	int			c_stage;	/* connection state */
	/*
	 * Preallocated buffer for pdus that have data but do not
	 * originate from scsi-ml. We never have two pdus using the
	 * buffer at the same time. It is only allocated to
	 * the default max recv size because the pdus we support
	 * should always fit in this buffer
	 */
	char			*data;
	struct iscsi_mgmt_task	*login_mtask;	/* mtask used for login/text */
	struct iscsi_mgmt_task	*mtask;		/* xmit mtask in progress */
	struct iscsi_cmd_task	*ctask;		/* xmit ctask in progress */

	/* xmit */
	struct kfifo		*immqueue;	/* immediate xmit queue */
	struct kfifo		*mgmtqueue;	/* mgmt (control) xmit queue */
	struct list_head	mgmt_run_list;	/* list of control tasks */
	struct list_head	xmitqueue;	/* data-path cmd queue */
	struct list_head	run_list;	/* list of cmds in progress */
	struct work_struct	xmitwork;	/* per-conn. xmit workqueue */
	/*
	 * serializes connection xmit, access to kfifos:
	 * xmitqueue, immqueue, mgmtqueue
	 */
	struct mutex		xmitmutex;

	unsigned long		suspend_tx;	/* suspend Tx */
	unsigned long		suspend_rx;	/* suspend Rx */

	/* abort */
	wait_queue_head_t	ehwait;		/* used in eh_abort() */
	struct iscsi_tm		tmhdr;
	struct timer_list	tmabort_timer;
	int			tmabort_state;	/* see TMABORT_INITIAL, etc.*/

	/* negotiated params */
	unsigned		max_recv_dlength; /* initiator_max_recv_dsl*/
	unsigned		max_xmit_dlength; /* target_max_recv_dsl */
	int			hdrdgst_en;
	int			datadgst_en;
	int			ifmarker_en;
	int			ofmarker_en;
	/* values userspace uses to id a conn */
	int			persistent_port;
	char			*persistent_address;

	/* MIB-statistics */
	uint64_t		txdata_octets;
	uint64_t		rxdata_octets;
	uint32_t		scsicmd_pdus_cnt;
	uint32_t		dataout_pdus_cnt;
	uint32_t		scsirsp_pdus_cnt;
	uint32_t		datain_pdus_cnt;
	uint32_t		r2t_pdus_cnt;
	uint32_t		tmfcmd_pdus_cnt;
	int32_t			tmfrsp_pdus_cnt;

	/* custom statistics */
	uint32_t		eh_abort_cnt;
};

struct iscsi_queue {
	struct kfifo		*queue;		/* FIFO Queue */
	void			**pool;		/* Pool of elements */
	int			max;		/* Max number of elements */
};

struct iscsi_session {
	/* iSCSI session-wide sequencing */
	uint32_t		cmdsn;
	uint32_t		exp_cmdsn;
	uint32_t		max_cmdsn;

	/* configuration */
	int			initial_r2t_en;
	unsigned		max_r2t;
	int			imm_data_en;
	unsigned		first_burst;
	unsigned		max_burst;
	int			time2wait;
	int			time2retain;
	int			pdu_inorder_en;
	int			dataseq_inorder_en;
	int			erl;
	int			tpgt;
	char			*targetname;
	char			*initiatorname;
	/* hw address being used for iscsi connection */
	char			*hwaddress;
	/* control data */
	struct iscsi_transport	*tt;
	struct Scsi_Host	*host;
	struct iscsi_conn	*leadconn;	/* leading connection */
	spinlock_t		lock;		/* protects session state, *
						 * sequence numbers,       *
						 * session resources:      *
						 * - cmdpool,		   *
						 * - mgmtpool,		   *
						 * - r2tpool		   */
	int			state;		/* session state           */
	int			age;		/* counts session re-opens */

	int			cmds_max;	/* size of cmds array */
	struct iscsi_cmd_task	**cmds;		/* Original Cmds arr */
	struct iscsi_queue	cmdpool;	/* PDU's pool */
	int			mgmtpool_max;	/* size of mgmt array */
	struct iscsi_mgmt_task	**mgmt_cmds;	/* Original mgmt arr */
	struct iscsi_queue	mgmtpool;	/* Mgmt PDU's pool */
};

/*
 * scsi host template
 */
extern int iscsi_change_queue_depth(struct scsi_device *sdev, int depth);
extern int iscsi_eh_abort(struct scsi_cmnd *sc);
extern int iscsi_eh_host_reset(struct scsi_cmnd *sc);
extern int iscsi_queuecommand(struct scsi_cmnd *sc,
			      void (*done)(struct scsi_cmnd *));


/*
 * iSCSI host helpers.
 */
extern int iscsi_host_set_param(struct Scsi_Host *shost,
				enum iscsi_host_param param, char *buf,
				int buflen);
extern int iscsi_host_get_param(struct Scsi_Host *shost,
				enum iscsi_host_param param, char *buf);

/*
 * session management
 */
extern struct iscsi_cls_session *
iscsi_session_setup(struct iscsi_transport *, struct scsi_transport_template *,
		    int, int, uint32_t, uint32_t *);
extern void iscsi_session_teardown(struct iscsi_cls_session *);
extern struct iscsi_session *class_to_transport_session(struct iscsi_cls_session *);
extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *);
extern int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
			   enum iscsi_param param, char *buf, int buflen);
extern int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
				   enum iscsi_param param, char *buf);

#define session_to_cls(_sess) \
	hostdata_session(_sess->host->hostdata)

/*
 * connection management
 */
extern struct iscsi_cls_conn *iscsi_conn_setup(struct iscsi_cls_session *,
					       uint32_t);
extern void iscsi_conn_teardown(struct iscsi_cls_conn *);
extern int iscsi_conn_start(struct iscsi_cls_conn *);
extern void iscsi_conn_stop(struct iscsi_cls_conn *, int);
extern int iscsi_conn_bind(struct iscsi_cls_session *, struct iscsi_cls_conn *,
			   int);
extern void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err);
extern int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
				enum iscsi_param param, char *buf);

/*
 * pdu and task processing
 */
extern int iscsi_check_assign_cmdsn(struct iscsi_session *,
				    struct iscsi_nopin *);
extern void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *,
					struct iscsi_data *hdr);
extern int iscsi_conn_send_pdu(struct iscsi_cls_conn *, struct iscsi_hdr *,
				char *, uint32_t);
extern int iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,
			      char *, int);
extern int __iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,
				char *, int);
extern int iscsi_verify_itt(struct iscsi_conn *, struct iscsi_hdr *,
			    uint32_t *);

/*
 * generic helpers
 */
extern void iscsi_pool_free(struct iscsi_queue *, void **);
extern int iscsi_pool_init(struct iscsi_queue *, int, void ***, int);

#endif
Commit	Line	Data
7996a778 MC	1	/*
	2	* iSCSI lib definitions
	3	*
	4	* Copyright (C) 2006 Red Hat, Inc. All rights reserved.
	5	* Copyright (C) 2004 - 2006 Mike Christie
	6	* Copyright (C) 2004 - 2005 Dmitry Yusupov
	7	* Copyright (C) 2004 - 2005 Alex Aizman
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or
	12	* (at your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	22	*/
	23	#ifndef LIBISCSI_H
	24	#define LIBISCSI_H
	25
	26	#include <linux/types.h>
	27	#include <linux/mutex.h>
f6a57033 AV	28	#include <linux/timer.h>
f6a57033 AV	29	#include <linux/workqueue.h>
7996a778 MC	30	#include <scsi/iscsi_proto.h>
	31	#include <scsi/iscsi_if.h>
	32
	33	struct scsi_transport_template;
	34	struct scsi_device;
	35	struct Scsi_Host;
	36	struct scsi_cmnd;
	37	struct socket;
	38	struct iscsi_transport;
	39	struct iscsi_cls_session;
	40	struct iscsi_cls_conn;
	41	struct iscsi_session;
	42	struct iscsi_nopin;
	43
	44	/* #define DEBUG_SCSI */
	45	#ifdef DEBUG_SCSI
be2df72e	46	#define debug_scsi(fmt...) printk(KERN_INFO "iscsi: " fmt)
7996a778 MC	47	#else
	48	#define debug_scsi(fmt...)
	49	#endif
	50
	51	#define ISCSI_XMIT_CMDS_MAX 128 /* must be power of 2 */
	52	#define ISCSI_MGMT_CMDS_MAX 32 /* must be power of 2 */
	53	#define ISCSI_CONN_MAX 1
	54
	55	#define ISCSI_MGMT_ITT_OFFSET 0xa00
	56
	57	#define ISCSI_DEF_CMD_PER_LUN 32
	58	#define ISCSI_MAX_CMD_PER_LUN 128
	59
	60	/* Task Mgmt states */
	61	#define TMABORT_INITIAL 0x0
	62	#define TMABORT_SUCCESS 0x1
	63	#define TMABORT_FAILED 0x2
	64	#define TMABORT_TIMEDOUT 0x3
7ea8b828	65	#define TMABORT_NOT_FOUND 0x4
7996a778 MC	66
	67	/* Connection suspend "bit" */
	68	#define ISCSI_SUSPEND_BIT 1
	69
	70	#define ISCSI_ITT_MASK (0xfff)
	71	#define ISCSI_CID_SHIFT 12
	72	#define ISCSI_CID_MASK (0xffff << ISCSI_CID_SHIFT)
	73	#define ISCSI_AGE_SHIFT 28
	74	#define ISCSI_AGE_MASK (0xf << ISCSI_AGE_SHIFT)
	75
	76	struct iscsi_mgmt_task {
	77	/*
	78	* Becuae LLDs allocate their hdr differently, this is a pointer to
	79	* that storage. It must be setup at session creation time.
	80	*/
	81	struct iscsi_hdr *hdr;
	82	char data; / mgmt payload */
857ae0bd	83	unsigned data_count; /* counts data to be sent */
7996a778 MC	84	uint32_t itt; /* this ITT */
	85	void dd_data; / driver/transport data */
	86	struct list_head running;
	87	};
	88
b6c395ed MC	89	enum {
	90	ISCSI_TASK_COMPLETED,
	91	ISCSI_TASK_PENDING,
	92	ISCSI_TASK_RUNNING,
	93	};
	94
7996a778 MC	95	struct iscsi_cmd_task {
	96	/*
	97	* Becuae LLDs allocate their hdr differently, this is a pointer to
	98	* that storage. It must be setup at session creation time.
	99	*/
	100	struct iscsi_cmd *hdr;
	101	int itt; /* this ITT */
7996a778 MC	102
7996a778 MC	103	uint32_t unsol_datasn;
857ae0bd MC	104	unsigned imm_count; /* imm-data (bytes) */
857ae0bd MC	105	unsigned unsol_count; /* unsolicited (bytes)*/
ffd0436e	106	/* offset in unsolicited stream (bytes); */
857ae0bd MC	107	unsigned unsol_offset;
857ae0bd MC	108	unsigned data_count; /* remaining Data-Out */
7996a778	109	struct scsi_cmnd sc; / associated SCSI cmd*/
7996a778 MC	110	struct iscsi_conn conn; / used connection */
	111	struct iscsi_mgmt_task mtask; / tmf mtask in progr */
	112
b6c395ed MC	113	/* state set/tested under session->lock */
b6c395ed MC	114	int state;
60ecebf5	115	atomic_t refcount;
7996a778 MC	116	struct list_head running; /* running cmd list */
	117	void dd_data; / driver/transport data */
	118	};
	119
	120	struct iscsi_conn {
	121	struct iscsi_cls_conn cls_conn; / ptr to class connection */
	122	void dd_data; / iscsi_transport data */
	123	struct iscsi_session session; / parent session */
	124	/*
	125	* LLDs should set this lock. It protects the transport recv
	126	* code
	127	*/
	128	rwlock_t *recv_lock;
	129	/*
	130	* conn_stop() flag: stop to recover, stop to terminate
	131	*/
	132	int stop_stage;
	133
	134	/* iSCSI connection-wide sequencing */
	135	uint32_t exp_statsn;
	136
	137	/* control data */
	138	int id; /* CID */
7996a778	139	int c_stage; /* connection state */
c8dc1e52 MC	140	/*
	141	* Preallocated buffer for pdus that have data but do not
	142	* originate from scsi-ml. We never have two pdus using the
	143	* buffer at the same time. It is only allocated to
	144	* the default max recv size because the pdus we support
	145	* should always fit in this buffer
	146	*/
	147	char *data;
7996a778 MC	148	struct iscsi_mgmt_task login_mtask; / mtask used for login/text */
	149	struct iscsi_mgmt_task mtask; / xmit mtask in progress */
	150	struct iscsi_cmd_task ctask; / xmit ctask in progress */
	151
	152	/* xmit */
	153	struct kfifo immqueue; / immediate xmit queue */
	154	struct kfifo mgmtqueue; / mgmt (control) xmit queue */
	155	struct list_head mgmt_run_list; /* list of control tasks */
b6c395ed	156	struct list_head xmitqueue; /* data-path cmd queue */
7996a778 MC	157	struct list_head run_list; /* list of cmds in progress */
	158	struct work_struct xmitwork; /* per-conn. xmit workqueue */
	159	/*
	160	* serializes connection xmit, access to kfifos:
	161	* xmitqueue, immqueue, mgmtqueue
	162	*/
	163	struct mutex xmitmutex;
	164
	165	unsigned long suspend_tx; /* suspend Tx */
	166	unsigned long suspend_rx; /* suspend Rx */
	167
	168	/* abort */
	169	wait_queue_head_t ehwait; /* used in eh_abort() */
	170	struct iscsi_tm tmhdr;
	171	struct timer_list tmabort_timer;
	172	int tmabort_state; /* see TMABORT_INITIAL, etc.*/
	173
	174	/* negotiated params */
857ae0bd MC	175	unsigned max_recv_dlength; /* initiator_max_recv_dsl*/
857ae0bd MC	176	unsigned max_xmit_dlength; /* target_max_recv_dsl */
7996a778 MC	177	int hdrdgst_en;
7996a778 MC	178	int datadgst_en;
a54a52ca MC	179	int ifmarker_en;
	180	int ofmarker_en;
	181	/* values userspace uses to id a conn */
	182	int persistent_port;
	183	char *persistent_address;
7996a778 MC	184
	185	/* MIB-statistics */
	186	uint64_t txdata_octets;
	187	uint64_t rxdata_octets;
	188	uint32_t scsicmd_pdus_cnt;
	189	uint32_t dataout_pdus_cnt;
	190	uint32_t scsirsp_pdus_cnt;
	191	uint32_t datain_pdus_cnt;
	192	uint32_t r2t_pdus_cnt;
	193	uint32_t tmfcmd_pdus_cnt;
	194	int32_t tmfrsp_pdus_cnt;
	195
	196	/* custom statistics */
	197	uint32_t eh_abort_cnt;
	198	};
	199
	200	struct iscsi_queue {
	201	struct kfifo queue; / FIFO Queue */
	202	void *pool; / Pool of elements */
	203	int max; /* Max number of elements */
	204	};
	205
	206	struct iscsi_session {
	207	/* iSCSI session-wide sequencing */
	208	uint32_t cmdsn;
	209	uint32_t exp_cmdsn;
	210	uint32_t max_cmdsn;
	211
	212	/* configuration */
	213	int initial_r2t_en;
857ae0bd	214	unsigned max_r2t;
7996a778	215	int imm_data_en;
857ae0bd MC	216	unsigned first_burst;
857ae0bd MC	217	unsigned max_burst;
7996a778 MC	218	int time2wait;
	219	int time2retain;
	220	int pdu_inorder_en;
	221	int dataseq_inorder_en;
	222	int erl;
a54a52ca MC	223	int tpgt;
a54a52ca MC	224	char *targetname;
8ad5781a	225	char *initiatorname;
0801c242 MC	226	/* hw address being used for iscsi connection */
0801c242 MC	227	char *hwaddress;
7996a778 MC	228	/* control data */
	229	struct iscsi_transport *tt;
	230	struct Scsi_Host *host;
	231	struct iscsi_conn leadconn; / leading connection */
	232	spinlock_t lock; /* protects session state, *
	233	* sequence numbers, *
	234	* session resources: *
	235	* - cmdpool, *
	236	* - mgmtpool, *
	237	* - r2tpool */
	238	int state; /* session state */
7996a778 MC	239	int age; /* counts session re-opens */
7996a778 MC	240
7996a778 MC	241	int cmds_max; /* size of cmds array */
	242	struct iscsi_cmd_task *cmds; / Original Cmds arr */
	243	struct iscsi_queue cmdpool; /* PDU's pool */
	244	int mgmtpool_max; /* size of mgmt array */
	245	struct iscsi_mgmt_task *mgmt_cmds; / Original mgmt arr */
	246	struct iscsi_queue mgmtpool; /* Mgmt PDU's pool */
	247	};
	248
	249	/*
	250	* scsi host template
	251	*/
	252	extern int iscsi_change_queue_depth(struct scsi_device *sdev, int depth);
	253	extern int iscsi_eh_abort(struct scsi_cmnd *sc);
	254	extern int iscsi_eh_host_reset(struct scsi_cmnd *sc);
	255	extern int iscsi_queuecommand(struct scsi_cmnd *sc,
	256	void (done)(struct scsi_cmnd ));
0801c242 MC	257
	258
	259	/*
	260	* iSCSI host helpers.
	261	*/
	262	extern int iscsi_host_set_param(struct Scsi_Host *shost,
	263	enum iscsi_host_param param, char *buf,
	264	int buflen);
	265	extern int iscsi_host_get_param(struct Scsi_Host *shost,
	266	enum iscsi_host_param param, char *buf);
7996a778 MC	267
	268	/*
	269	* session management
	270	*/
	271	extern struct iscsi_cls_session *
	272	iscsi_session_setup(struct iscsi_transport , struct scsi_transport_template ,
	273	int, int, uint32_t, uint32_t *);
	274	extern void iscsi_session_teardown(struct iscsi_cls_session *);
	275	extern struct iscsi_session class_to_transport_session(struct iscsi_cls_session );
7996a778	276	extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *);
a54a52ca MC	277	extern int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
	278	enum iscsi_param param, char *buf, int buflen);
	279	extern int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
	280	enum iscsi_param param, char *buf);
7996a778 MC	281
	282	#define session_to_cls(_sess) \
	283	hostdata_session(_sess->host->hostdata)
	284
	285	/*
	286	* connection management
	287	*/
	288	extern struct iscsi_cls_conn iscsi_conn_setup(struct iscsi_cls_session ,
	289	uint32_t);
	290	extern void iscsi_conn_teardown(struct iscsi_cls_conn *);
	291	extern int iscsi_conn_start(struct iscsi_cls_conn *);
	292	extern void iscsi_conn_stop(struct iscsi_cls_conn *, int);
	293	extern int iscsi_conn_bind(struct iscsi_cls_session , struct iscsi_cls_conn ,
	294	int);
	295	extern void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err);
a54a52ca MC	296	extern int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
a54a52ca MC	297	enum iscsi_param param, char *buf);
7996a778 MC	298
	299	/*
	300	* pdu and task processing
	301	*/
	302	extern int iscsi_check_assign_cmdsn(struct iscsi_session *,
	303	struct iscsi_nopin *);
	304	extern void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *,
ffd0436e	305	struct iscsi_data *hdr);
7996a778 MC	306	extern int iscsi_conn_send_pdu(struct iscsi_cls_conn , struct iscsi_hdr ,
	307	char *, uint32_t);
	308	extern int iscsi_complete_pdu(struct iscsi_conn , struct iscsi_hdr ,
	309	char *, int);
	310	extern int __iscsi_complete_pdu(struct iscsi_conn , struct iscsi_hdr ,
	311	char *, int);
	312	extern int iscsi_verify_itt(struct iscsi_conn , struct iscsi_hdr ,
	313	uint32_t *);
	314
	315	/*
	316	* generic helpers
	317	*/
	318	extern void iscsi_pool_free(struct iscsi_queue , void *);
	319	extern int iscsi_pool_init(struct iscsi_queue , int, void **, int);
	320
	321	#endif