[deliverable/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 */
	int			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 */
	int			datasn;		/* DataSN */

	uint32_t		unsol_datasn;
	int			imm_count;	/* imm-data (bytes)   */
	int			unsol_count;	/* unsolicited (bytes)*/
	/* offset in unsolicited stream (bytes); */
	int			unsol_offset;
	int			data_count;	/* remaining Data-Out */
	struct scsi_cmnd	*sc;		/* associated SCSI cmd*/
	int			total_length;
	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 */
	int			max_recv_dlength; /* initiator_max_recv_dsl*/
	int			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;
	int			max_r2t;
	int			imm_data_en;
	int			first_burst;
	int			max_burst;
	int			time2wait;
	int			time2retain;
	int			pdu_inorder_en;
	int			dataseq_inorder_en;
	int			erl;
	int			tpgt;
	char			*targetname;

	/* 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 *));

/*
 * 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 */
	83	int data_count; /* counts data to be sent */
	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 */
	102	int datasn; /* DataSN */
	103
	104	uint32_t unsol_datasn;
	105	int imm_count; /* imm-data (bytes) */
	106	int unsol_count; /* unsolicited (bytes)*/
ffd0436e MC	107	/* offset in unsolicited stream (bytes); */
ffd0436e MC	108	int unsol_offset;
7996a778 MC	109	int data_count; /* remaining Data-Out */
	110	struct scsi_cmnd sc; / associated SCSI cmd*/
	111	int total_length;
	112	struct iscsi_conn conn; / used connection */
	113	struct iscsi_mgmt_task mtask; / tmf mtask in progr */
	114
b6c395ed MC	115	/* state set/tested under session->lock */
b6c395ed MC	116	int state;
60ecebf5	117	atomic_t refcount;
7996a778 MC	118	struct list_head running; /* running cmd list */
	119	void dd_data; / driver/transport data */
	120	};
	121
	122	struct iscsi_conn {
	123	struct iscsi_cls_conn cls_conn; / ptr to class connection */
	124	void dd_data; / iscsi_transport data */
	125	struct iscsi_session session; / parent session */
	126	/*
	127	* LLDs should set this lock. It protects the transport recv
	128	* code
	129	*/
	130	rwlock_t *recv_lock;
	131	/*
	132	* conn_stop() flag: stop to recover, stop to terminate
	133	*/
	134	int stop_stage;
	135
	136	/* iSCSI connection-wide sequencing */
	137	uint32_t exp_statsn;
	138
	139	/* control data */
	140	int id; /* CID */
7996a778	141	int c_stage; /* connection state */
c8dc1e52 MC	142	/*
	143	* Preallocated buffer for pdus that have data but do not
	144	* originate from scsi-ml. We never have two pdus using the
	145	* buffer at the same time. It is only allocated to
	146	* the default max recv size because the pdus we support
	147	* should always fit in this buffer
	148	*/
	149	char *data;
7996a778 MC	150	struct iscsi_mgmt_task login_mtask; / mtask used for login/text */
	151	struct iscsi_mgmt_task mtask; / xmit mtask in progress */
	152	struct iscsi_cmd_task ctask; / xmit ctask in progress */
	153
	154	/* xmit */
	155	struct kfifo immqueue; / immediate xmit queue */
	156	struct kfifo mgmtqueue; / mgmt (control) xmit queue */
	157	struct list_head mgmt_run_list; /* list of control tasks */
b6c395ed	158	struct list_head xmitqueue; /* data-path cmd queue */
7996a778 MC	159	struct list_head run_list; /* list of cmds in progress */
	160	struct work_struct xmitwork; /* per-conn. xmit workqueue */
	161	/*
	162	* serializes connection xmit, access to kfifos:
	163	* xmitqueue, immqueue, mgmtqueue
	164	*/
	165	struct mutex xmitmutex;
	166
	167	unsigned long suspend_tx; /* suspend Tx */
	168	unsigned long suspend_rx; /* suspend Rx */
	169
	170	/* abort */
	171	wait_queue_head_t ehwait; /* used in eh_abort() */
	172	struct iscsi_tm tmhdr;
	173	struct timer_list tmabort_timer;
	174	int tmabort_state; /* see TMABORT_INITIAL, etc.*/
	175
	176	/* negotiated params */
	177	int max_recv_dlength; /* initiator_max_recv_dsl*/
	178	int max_xmit_dlength; /* target_max_recv_dsl */
	179	int hdrdgst_en;
	180	int datadgst_en;
a54a52ca MC	181	int ifmarker_en;
	182	int ofmarker_en;
	183	/* values userspace uses to id a conn */
	184	int persistent_port;
	185	char *persistent_address;
7996a778 MC	186
	187	/* MIB-statistics */
	188	uint64_t txdata_octets;
	189	uint64_t rxdata_octets;
	190	uint32_t scsicmd_pdus_cnt;
	191	uint32_t dataout_pdus_cnt;
	192	uint32_t scsirsp_pdus_cnt;
	193	uint32_t datain_pdus_cnt;
	194	uint32_t r2t_pdus_cnt;
	195	uint32_t tmfcmd_pdus_cnt;
	196	int32_t tmfrsp_pdus_cnt;
	197
	198	/* custom statistics */
	199	uint32_t eh_abort_cnt;
	200	};
	201
	202	struct iscsi_queue {
	203	struct kfifo queue; / FIFO Queue */
	204	void *pool; / Pool of elements */
	205	int max; /* Max number of elements */
	206	};
	207
	208	struct iscsi_session {
	209	/* iSCSI session-wide sequencing */
	210	uint32_t cmdsn;
	211	uint32_t exp_cmdsn;
	212	uint32_t max_cmdsn;
	213
	214	/* configuration */
	215	int initial_r2t_en;
	216	int max_r2t;
	217	int imm_data_en;
	218	int first_burst;
	219	int max_burst;
	220	int time2wait;
	221	int time2retain;
	222	int pdu_inorder_en;
	223	int dataseq_inorder_en;
	224	int erl;
a54a52ca MC	225	int tpgt;
a54a52ca MC	226	char *targetname;
7996a778 MC	227
	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 ));
	257
	258	/*
	259	* session management
	260	*/
	261	extern struct iscsi_cls_session *
	262	iscsi_session_setup(struct iscsi_transport , struct scsi_transport_template ,
	263	int, int, uint32_t, uint32_t *);
	264	extern void iscsi_session_teardown(struct iscsi_cls_session *);
	265	extern struct iscsi_session class_to_transport_session(struct iscsi_cls_session );
7996a778	266	extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *);
a54a52ca MC	267	extern int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
	268	enum iscsi_param param, char *buf, int buflen);
	269	extern int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
	270	enum iscsi_param param, char *buf);
7996a778 MC	271
	272	#define session_to_cls(_sess) \
	273	hostdata_session(_sess->host->hostdata)
	274
	275	/*
	276	* connection management
	277	*/
	278	extern struct iscsi_cls_conn iscsi_conn_setup(struct iscsi_cls_session ,
	279	uint32_t);
	280	extern void iscsi_conn_teardown(struct iscsi_cls_conn *);
	281	extern int iscsi_conn_start(struct iscsi_cls_conn *);
	282	extern void iscsi_conn_stop(struct iscsi_cls_conn *, int);
	283	extern int iscsi_conn_bind(struct iscsi_cls_session , struct iscsi_cls_conn ,
	284	int);
	285	extern void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err);
a54a52ca MC	286	extern int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
a54a52ca MC	287	enum iscsi_param param, char *buf);
7996a778 MC	288
	289	/*
	290	* pdu and task processing
	291	*/
	292	extern int iscsi_check_assign_cmdsn(struct iscsi_session *,
	293	struct iscsi_nopin *);
	294	extern void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *,
ffd0436e	295	struct iscsi_data *hdr);
7996a778 MC	296	extern int iscsi_conn_send_pdu(struct iscsi_cls_conn , struct iscsi_hdr ,
	297	char *, uint32_t);
	298	extern int iscsi_complete_pdu(struct iscsi_conn , struct iscsi_hdr ,
	299	char *, int);
	300	extern int __iscsi_complete_pdu(struct iscsi_conn , struct iscsi_hdr ,
	301	char *, int);
	302	extern int iscsi_verify_itt(struct iscsi_conn , struct iscsi_hdr ,
	303	uint32_t *);
	304
	305	/*
	306	* generic helpers
	307	*/
	308	extern void iscsi_pool_free(struct iscsi_queue , void *);
	309	extern int iscsi_pool_init(struct iscsi_queue , int, void **, int);
	310
	311	#endif