[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/wait.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_host_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;
struct device;

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

#define ISCSI_DEF_XMIT_CMDS_MAX	128	/* must be power of 2 */
#define ISCSI_MGMT_CMDS_MAX	15

#define ISCSI_DEF_CMD_PER_LUN		32
#define ISCSI_MAX_CMD_PER_LUN		128

/* Task Mgmt states */
enum {
	TMF_INITIAL,
	TMF_QUEUED,
	TMF_SUCCESS,
	TMF_FAILED,
	TMF_TIMEDOUT,
	TMF_NOT_FOUND,
};

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

#define ISCSI_ITT_MASK			(0x1fff)
#define ISCSI_TOTAL_CMDS_MAX		4096
/* this must be a power of two greater than ISCSI_MGMT_CMDS_MAX */
#define ISCSI_TOTAL_CMDS_MIN		16
#define ISCSI_AGE_SHIFT			28
#define ISCSI_AGE_MASK			(0xf << ISCSI_AGE_SHIFT)

#define ISCSI_ADDRESS_BUF_LEN		64

enum {
	/* this is the maximum possible storage for AHSs */
	ISCSI_MAX_AHS_SIZE = sizeof(struct iscsi_ecdb_ahdr) +
				sizeof(struct iscsi_rlength_ahdr),
	ISCSI_DIGEST_SIZE = sizeof(__u32),
};


enum {
	ISCSI_TASK_COMPLETED,
	ISCSI_TASK_PENDING,
	ISCSI_TASK_RUNNING,
};

struct iscsi_task {
	/*
	 * Because LLDs allocate their hdr differently, this is a pointer
	 * and length to that storage. It must be setup at session
	 * creation time.
	 */
	struct iscsi_cmd	*hdr;
	unsigned short		hdr_max;
	unsigned short		hdr_len;	/* accumulated size of hdr used */
	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 */
	char			*data;		/* mgmt payload */
	struct scsi_cmnd	*sc;		/* associated SCSI cmd*/
	struct iscsi_conn	*conn;		/* used connection    */

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

static inline void* iscsi_next_hdr(struct iscsi_task *task)
{
	return (void*)task->hdr + task->hdr_len;
}

/* Connection's states */
enum {
	ISCSI_CONN_INITIAL_STAGE,
	ISCSI_CONN_STARTED,
	ISCSI_CONN_STOPPED,
	ISCSI_CONN_CLEANUP_WAIT,
};

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 */
	/*
	 * conn_stop() flag: stop to recover, stop to terminate
	 */
        int			stop_stage;
	struct timer_list	transport_timer;
	unsigned long		last_recv;
	unsigned long		last_ping;
	int			ping_timeout;
	int			recv_timeout;
	struct iscsi_task 	*ping_task;

	/* 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_task 	*login_task;	/* mtask used for login/text */
	struct iscsi_task	*task;		/* xmit task in progress */

	/* xmit */
	struct list_head	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 list_head	requeue;	/* tasks needing another run */
	struct work_struct	xmitwork;	/* per-conn. xmit workqueue */
	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	tmf_timer;
	int			tmf_state;	/* see TMF_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;
	/* remote portal currently connected to */
	int			portal_port;
	char			portal_address[ISCSI_ADDRESS_BUF_LEN];

	/* 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;
	uint32_t		fmr_unalign_cnt;
};

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

/* Session's states */
enum {
	ISCSI_STATE_FREE = 1,
	ISCSI_STATE_LOGGED_IN,
	ISCSI_STATE_FAILED,
	ISCSI_STATE_TERMINATE,
	ISCSI_STATE_IN_RECOVERY,
	ISCSI_STATE_RECOVERY_FAILED,
	ISCSI_STATE_LOGGING_OUT,
};

struct iscsi_session {
	struct iscsi_cls_session *cls_session;
	/*
	 * Syncs up the scsi eh thread with the iscsi eh thread when sending
	 * task management functions. This must be taken before the session
	 * and recv lock.
	 */
	struct mutex		eh_mutex;

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

	/* This tracks the reqs queued into the initiator */
	uint32_t		queued_cmdsn;

	/* configuration */
	int			abort_timeout;
	int			lu_reset_timeout;
	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			fast_abort;
	int			tpgt;
	char			*username;
	char			*username_in;
	char			*password;
	char			*password_in;
	char			*targetname;
	char			*ifacename;
	char			*initiatorname;
	/* 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			scsi_cmds_max; 	/* max scsi commands */
	int			cmds_max;	/* size of cmds array */
	struct iscsi_task	**cmds;		/* Original Cmds arr */
	struct iscsi_pool	cmdpool;	/* PDU's pool */
};

struct iscsi_host {
	char			*initiatorname;
	/* hw address or netdev iscsi connection is bound to */
	char			*hwaddress;
	char			*netdev;
	/* local address */
	int			local_port;
	char			local_address[ISCSI_ADDRESS_BUF_LEN];
};

/*
 * 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_eh_device_reset(struct scsi_cmnd *sc);
extern int iscsi_queuecommand(struct scsi_cmnd *sc,
			      void (*done)(struct scsi_cmnd *));

/*
 * iSCSI host helpers.
 */
#define iscsi_host_priv(_shost) \
	(shost_priv(_shost) + sizeof(struct iscsi_host))

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);
extern int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev);
extern struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
					  int dd_data_size, uint16_t qdepth);
extern void iscsi_host_remove(struct Scsi_Host *shost);
extern void iscsi_host_free(struct Scsi_Host *shost);

/*
 * session management
 */
extern struct iscsi_cls_session *
iscsi_session_setup(struct iscsi_transport *, struct Scsi_Host *shost,
		    uint16_t, int, uint32_t, unsigned int);
extern void iscsi_session_teardown(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 iscsi_session_printk(prefix, _sess, fmt, a...)	\
	iscsi_cls_session_printk(prefix, _sess->cls_session, fmt, ##a)

/*
 * connection management
 */
extern struct iscsi_cls_conn *iscsi_conn_setup(struct iscsi_cls_session *,
					       int, 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);
extern void iscsi_suspend_tx(struct iscsi_conn *conn);

#define iscsi_conn_printk(prefix, _c, fmt, a...) \
	iscsi_cls_conn_printk(prefix, ((struct iscsi_conn *)_c)->cls_conn, \
			      fmt, ##a)

/*
 * pdu and task processing
 */
extern void iscsi_update_cmdsn(struct iscsi_session *, struct iscsi_nopin *);
extern void iscsi_prep_unsolicit_data_pdu(struct iscsi_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 *, itt_t);
extern struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *, itt_t);
extern void iscsi_requeue_task(struct iscsi_task *task);
extern void iscsi_put_task(struct iscsi_task *task);
extern void __iscsi_get_task(struct iscsi_task *task);

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

/*
 * inline functions to deal with padding.
 */
static inline unsigned int
iscsi_padded(unsigned int len)
{
	return (len + ISCSI_PAD_LEN - 1) & ~(ISCSI_PAD_LEN - 1);
}

static inline unsigned int
iscsi_padding(unsigned int len)
{
	len &= (ISCSI_PAD_LEN - 1);
	if (len)
		len = ISCSI_PAD_LEN - len;
	return len;
}

#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>
40753caa	27	#include <linux/wait.h>
7996a778	28	#include <linux/mutex.h>
f6a57033 AV	29	#include <linux/timer.h>
f6a57033 AV	30	#include <linux/workqueue.h>
7996a778 MC	31	#include <scsi/iscsi_proto.h>
	32	#include <scsi/iscsi_if.h>
	33
	34	struct scsi_transport_template;
a4804cd6	35	struct scsi_host_template;
7996a778 MC	36	struct scsi_device;
	37	struct Scsi_Host;
	38	struct scsi_cmnd;
	39	struct socket;
	40	struct iscsi_transport;
	41	struct iscsi_cls_session;
	42	struct iscsi_cls_conn;
	43	struct iscsi_session;
	44	struct iscsi_nopin;
a4804cd6	45	struct device;
7996a778 MC	46
	47	/* #define DEBUG_SCSI */
	48	#ifdef DEBUG_SCSI
be2df72e	49	#define debug_scsi(fmt...) printk(KERN_INFO "iscsi: " fmt)
7996a778 MC	50	#else
	51	#define debug_scsi(fmt...)
	52	#endif
	53
1548271e	54	#define ISCSI_DEF_XMIT_CMDS_MAX 128 /* must be power of 2 */
3cf7b233	55	#define ISCSI_MGMT_CMDS_MAX 15
7996a778 MC	56
	57	#define ISCSI_DEF_CMD_PER_LUN 32
	58	#define ISCSI_MAX_CMD_PER_LUN 128
	59
	60	/* Task Mgmt states */
843c0a8a MC	61	enum {
	62	TMF_INITIAL,
	63	TMF_QUEUED,
	64	TMF_SUCCESS,
	65	TMF_FAILED,
	66	TMF_TIMEDOUT,
	67	TMF_NOT_FOUND,
	68	};
7996a778 MC	69
	70	/* Connection suspend "bit" */
	71	#define ISCSI_SUSPEND_BIT 1
	72
3cf7b233 MC	73	#define ISCSI_ITT_MASK (0x1fff)
	74	#define ISCSI_TOTAL_CMDS_MAX 4096
	75	/* this must be a power of two greater than ISCSI_MGMT_CMDS_MAX */
	76	#define ISCSI_TOTAL_CMDS_MIN 16
7996a778 MC	77	#define ISCSI_AGE_SHIFT 28
	78	#define ISCSI_AGE_MASK (0xf << ISCSI_AGE_SHIFT)
	79
22236961 MC	80	#define ISCSI_ADDRESS_BUF_LEN 64
22236961 MC	81
da32dd68	82	enum {
004d6530 BH	83	/* this is the maximum possible storage for AHSs */
	84	ISCSI_MAX_AHS_SIZE = sizeof(struct iscsi_ecdb_ahdr) +
	85	sizeof(struct iscsi_rlength_ahdr),
da32dd68 OK	86	ISCSI_DIGEST_SIZE = sizeof(__u32),
	87	};
	88
7996a778	89
b6c395ed MC	90	enum {
	91	ISCSI_TASK_COMPLETED,
	92	ISCSI_TASK_PENDING,
	93	ISCSI_TASK_RUNNING,
	94	};
	95
9c19a7d0	96	struct iscsi_task {
7996a778	97	/*
004d6530 BH	98	* Because LLDs allocate their hdr differently, this is a pointer
	99	* and length to that storage. It must be setup at session
	100	* creation time.
7996a778 MC	101	*/
7996a778 MC	102	struct iscsi_cmd *hdr;
004d6530 BH	103	unsigned short hdr_max;
004d6530 BH	104	unsigned short hdr_len; /* accumulated size of hdr used */
7996a778	105	int itt; /* this ITT */
7996a778 MC	106
7996a778 MC	107	uint32_t unsol_datasn;
857ae0bd MC	108	unsigned imm_count; /* imm-data (bytes) */
857ae0bd MC	109	unsigned unsol_count; /* unsolicited (bytes)*/
ffd0436e	110	/* offset in unsolicited stream (bytes); */
857ae0bd MC	111	unsigned unsol_offset;
857ae0bd MC	112	unsigned data_count; /* remaining Data-Out */
3e5c28ad	113	char data; / mgmt payload */
7996a778	114	struct scsi_cmnd sc; / associated SCSI cmd*/
7996a778	115	struct iscsi_conn conn; / used connection */
7996a778	116
b6c395ed MC	117	/* state set/tested under session->lock */
b6c395ed MC	118	int state;
60ecebf5	119	atomic_t refcount;
7996a778 MC	120	struct list_head running; /* running cmd list */
	121	void dd_data; / driver/transport data */
	122	};
	123
9c19a7d0	124	static inline void* iscsi_next_hdr(struct iscsi_task *task)
004d6530	125	{
9c19a7d0	126	return (void*)task->hdr + task->hdr_len;
004d6530 BH	127	}
004d6530 BH	128
6eabafbe MC	129	/* Connection's states */
	130	enum {
	131	ISCSI_CONN_INITIAL_STAGE,
	132	ISCSI_CONN_STARTED,
	133	ISCSI_CONN_STOPPED,
	134	ISCSI_CONN_CLEANUP_WAIT,
	135	};
	136
7996a778 MC	137	struct iscsi_conn {
	138	struct iscsi_cls_conn cls_conn; / ptr to class connection */
	139	void dd_data; / iscsi_transport data */
	140	struct iscsi_session session; / parent session */
7996a778 MC	141	/*
	142	* conn_stop() flag: stop to recover, stop to terminate
	143	*/
	144	int stop_stage;
f6d5180c MC	145	struct timer_list transport_timer;
	146	unsigned long last_recv;
	147	unsigned long last_ping;
	148	int ping_timeout;
	149	int recv_timeout;
9c19a7d0	150	struct iscsi_task *ping_task;
7996a778 MC	151
	152	/* iSCSI connection-wide sequencing */
	153	uint32_t exp_statsn;
	154
	155	/* control data */
	156	int id; /* CID */
7996a778	157	int c_stage; /* connection state */
c8dc1e52 MC	158	/*
	159	* Preallocated buffer for pdus that have data but do not
	160	* originate from scsi-ml. We never have two pdus using the
	161	* buffer at the same time. It is only allocated to
	162	* the default max recv size because the pdus we support
	163	* should always fit in this buffer
	164	*/
	165	char *data;
9c19a7d0 MC	166	struct iscsi_task login_task; / mtask used for login/text */
9c19a7d0 MC	167	struct iscsi_task task; / xmit task in progress */
7996a778 MC	168
7996a778 MC	169	/* xmit */
843c0a8a	170	struct list_head mgmtqueue; /* mgmt (control) xmit queue */
7996a778	171	struct list_head mgmt_run_list; /* list of control tasks */
b6c395ed	172	struct list_head xmitqueue; /* data-path cmd queue */
7996a778	173	struct list_head run_list; /* list of cmds in progress */
843c0a8a	174	struct list_head requeue; /* tasks needing another run */
7996a778	175	struct work_struct xmitwork; /* per-conn. xmit workqueue */
7996a778 MC	176	unsigned long suspend_tx; /* suspend Tx */
	177	unsigned long suspend_rx; /* suspend Rx */
	178
	179	/* abort */
	180	wait_queue_head_t ehwait; /* used in eh_abort() */
	181	struct iscsi_tm tmhdr;
843c0a8a MC	182	struct timer_list tmf_timer;
843c0a8a MC	183	int tmf_state; /* see TMF_INITIAL, etc.*/
7996a778 MC	184
7996a778 MC	185	/* negotiated params */
857ae0bd MC	186	unsigned max_recv_dlength; /* initiator_max_recv_dsl*/
857ae0bd MC	187	unsigned max_xmit_dlength; /* target_max_recv_dsl */
7996a778 MC	188	int hdrdgst_en;
7996a778 MC	189	int datadgst_en;
a54a52ca MC	190	int ifmarker_en;
	191	int ofmarker_en;
	192	/* values userspace uses to id a conn */
	193	int persistent_port;
	194	char *persistent_address;
22236961 MC	195	/* remote portal currently connected to */
	196	int portal_port;
	197	char portal_address[ISCSI_ADDRESS_BUF_LEN];
7996a778 MC	198
	199	/* MIB-statistics */
	200	uint64_t txdata_octets;
	201	uint64_t rxdata_octets;
	202	uint32_t scsicmd_pdus_cnt;
	203	uint32_t dataout_pdus_cnt;
	204	uint32_t scsirsp_pdus_cnt;
	205	uint32_t datain_pdus_cnt;
	206	uint32_t r2t_pdus_cnt;
	207	uint32_t tmfcmd_pdus_cnt;
	208	int32_t tmfrsp_pdus_cnt;
	209
	210	/* custom statistics */
	211	uint32_t eh_abort_cnt;
87528227	212	uint32_t fmr_unalign_cnt;
7996a778 MC	213	};
7996a778 MC	214
6320377f	215	struct iscsi_pool {
7996a778 MC	216	struct kfifo queue; / FIFO Queue */
	217	void *pool; / Pool of elements */
	218	int max; /* Max number of elements */
	219	};
	220
6eabafbe MC	221	/* Session's states */
	222	enum {
	223	ISCSI_STATE_FREE = 1,
	224	ISCSI_STATE_LOGGED_IN,
	225	ISCSI_STATE_FAILED,
	226	ISCSI_STATE_TERMINATE,
	227	ISCSI_STATE_IN_RECOVERY,
	228	ISCSI_STATE_RECOVERY_FAILED,
	229	ISCSI_STATE_LOGGING_OUT,
	230	};
	231
7996a778	232	struct iscsi_session {
75613521	233	struct iscsi_cls_session *cls_session;
6724add1 MC	234	/*
	235	* Syncs up the scsi eh thread with the iscsi eh thread when sending
	236	* task management functions. This must be taken before the session
	237	* and recv lock.
	238	*/
	239	struct mutex eh_mutex;
	240
7996a778 MC	241	/* iSCSI session-wide sequencing */
	242	uint32_t cmdsn;
	243	uint32_t exp_cmdsn;
	244	uint32_t max_cmdsn;
	245
e0726407 MC	246	/* This tracks the reqs queued into the initiator */
	247	uint32_t queued_cmdsn;
	248
7996a778	249	/* configuration */
f6d5180c MC	250	int abort_timeout;
f6d5180c MC	251	int lu_reset_timeout;
7996a778	252	int initial_r2t_en;
857ae0bd	253	unsigned max_r2t;
7996a778	254	int imm_data_en;
857ae0bd MC	255	unsigned first_burst;
857ae0bd MC	256	unsigned max_burst;
7996a778 MC	257	int time2wait;
	258	int time2retain;
	259	int pdu_inorder_en;
	260	int dataseq_inorder_en;
	261	int erl;
843c0a8a	262	int fast_abort;
a54a52ca	263	int tpgt;
b2c64167 MC	264	char *username;
	265	char *username_in;
	266	char *password;
	267	char *password_in;
a54a52ca	268	char *targetname;
88dfd340 MC	269	char *ifacename;
88dfd340 MC	270	char *initiatorname;
7996a778 MC	271	/* control data */
	272	struct iscsi_transport *tt;
	273	struct Scsi_Host *host;
	274	struct iscsi_conn leadconn; / leading connection */
	275	spinlock_t lock; /* protects session state, *
	276	* sequence numbers, *
	277	* session resources: *
	278	* - cmdpool, *
	279	* - mgmtpool, *
	280	* - r2tpool */
	281	int state; /* session state */
7996a778 MC	282	int age; /* counts session re-opens */
7996a778 MC	283
3e5c28ad	284	int scsi_cmds_max; /* max scsi commands */
7996a778	285	int cmds_max; /* size of cmds array */
9c19a7d0	286	struct iscsi_task *cmds; / Original Cmds arr */
6320377f	287	struct iscsi_pool cmdpool; /* PDU's pool */
7996a778 MC	288	};
7996a778 MC	289
75613521 MC	290	struct iscsi_host {
	291	char *initiatorname;
	292	/* hw address or netdev iscsi connection is bound to */
	293	char *hwaddress;
	294	char *netdev;
	295	/* local address */
	296	int local_port;
	297	char local_address[ISCSI_ADDRESS_BUF_LEN];
	298	};
	299
7996a778 MC	300	/*
	301	* scsi host template
	302	*/
	303	extern int iscsi_change_queue_depth(struct scsi_device *sdev, int depth);
	304	extern int iscsi_eh_abort(struct scsi_cmnd *sc);
	305	extern int iscsi_eh_host_reset(struct scsi_cmnd *sc);
843c0a8a	306	extern int iscsi_eh_device_reset(struct scsi_cmnd *sc);
7996a778 MC	307	extern int iscsi_queuecommand(struct scsi_cmnd *sc,
7996a778 MC	308	void (done)(struct scsi_cmnd ));
0801c242	309
0801c242 MC	310	/*
	311	* iSCSI host helpers.
	312	*/
5d91e209 MC	313	#define iscsi_host_priv(_shost) \
	314	(shost_priv(_shost) + sizeof(struct iscsi_host))
	315
0801c242 MC	316	extern int iscsi_host_set_param(struct Scsi_Host *shost,
	317	enum iscsi_host_param param, char *buf,
	318	int buflen);
	319	extern int iscsi_host_get_param(struct Scsi_Host *shost,
	320	enum iscsi_host_param param, char *buf);
a4804cd6 MC	321	extern int iscsi_host_add(struct Scsi_Host shost, struct device pdev);
	322	extern struct Scsi_Host iscsi_host_alloc(struct scsi_host_template sht,
	323	int dd_data_size, uint16_t qdepth);
	324	extern void iscsi_host_remove(struct Scsi_Host *shost);
	325	extern void iscsi_host_free(struct Scsi_Host *shost);
7996a778 MC	326
	327	/*
	328	* session management
	329	*/
	330	extern struct iscsi_cls_session *
75613521	331	iscsi_session_setup(struct iscsi_transport , struct Scsi_Host shost,
7970634b	332	uint16_t, int, uint32_t, unsigned int);
7996a778	333	extern void iscsi_session_teardown(struct iscsi_cls_session *);
7996a778	334	extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *);
a54a52ca MC	335	extern int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
	336	enum iscsi_param param, char *buf, int buflen);
	337	extern int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
	338	enum iscsi_param param, char *buf);
7996a778	339
322d739d	340	#define iscsi_session_printk(prefix, _sess, fmt, a...) \
75613521	341	iscsi_cls_session_printk(prefix, _sess->cls_session, fmt, ##a)
322d739d	342
7996a778 MC	343	/*
	344	* connection management
	345	*/
	346	extern struct iscsi_cls_conn iscsi_conn_setup(struct iscsi_cls_session ,
5d91e209	347	int, uint32_t);
7996a778 MC	348	extern void iscsi_conn_teardown(struct iscsi_cls_conn *);
	349	extern int iscsi_conn_start(struct iscsi_cls_conn *);
	350	extern void iscsi_conn_stop(struct iscsi_cls_conn *, int);
	351	extern int iscsi_conn_bind(struct iscsi_cls_session , struct iscsi_cls_conn ,
	352	int);
	353	extern void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err);
a54a52ca MC	354	extern int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
a54a52ca MC	355	enum iscsi_param param, char *buf);
5af3e91d	356	extern void iscsi_suspend_tx(struct iscsi_conn *conn);
7996a778	357
322d739d	358	#define iscsi_conn_printk(prefix, _c, fmt, a...) \
5af3e91d MC	359	iscsi_cls_conn_printk(prefix, ((struct iscsi_conn *)_c)->cls_conn, \
5af3e91d MC	360	fmt, ##a)
322d739d	361
7996a778 MC	362	/*
	363	* pdu and task processing
	364	*/
77a23c21	365	extern void iscsi_update_cmdsn(struct iscsi_session , struct iscsi_nopin );
9c19a7d0	366	extern void iscsi_prep_unsolicit_data_pdu(struct iscsi_task *,
ffd0436e	367	struct iscsi_data *hdr);
7996a778 MC	368	extern int iscsi_conn_send_pdu(struct iscsi_cls_conn , struct iscsi_hdr ,
	369	char *, uint32_t);
	370	extern int iscsi_complete_pdu(struct iscsi_conn , struct iscsi_hdr ,
	371	char *, int);
913e5bf4 MC	372	extern int __iscsi_complete_pdu(struct iscsi_conn , struct iscsi_hdr ,
913e5bf4 MC	373	char *, int);
0af967f5	374	extern int iscsi_verify_itt(struct iscsi_conn *, itt_t);
9c19a7d0 MC	375	extern struct iscsi_task iscsi_itt_to_ctask(struct iscsi_conn , itt_t);
	376	extern void iscsi_requeue_task(struct iscsi_task *task);
	377	extern void iscsi_put_task(struct iscsi_task *task);
913e5bf4	378	extern void __iscsi_get_task(struct iscsi_task *task);
7996a778 MC	379
	380	/*
	381	* generic helpers
	382	*/
6320377f OK	383	extern void iscsi_pool_free(struct iscsi_pool *);
6320377f OK	384	extern int iscsi_pool_init(struct iscsi_pool , int, void **, int);
7996a778	385
004d6530 BH	386	/*
	387	* inline functions to deal with padding.
	388	*/
	389	static inline unsigned int
	390	iscsi_padded(unsigned int len)
	391	{
	392	return (len + ISCSI_PAD_LEN - 1) & ~(ISCSI_PAD_LEN - 1);
	393	}
	394
	395	static inline unsigned int
	396	iscsi_padding(unsigned int len)
	397	{
	398	len &= (ISCSI_PAD_LEN - 1);
	399	if (len)
	400	len = ISCSI_PAD_LEN - len;
	401	return len;
	402	}
	403
7996a778	404	#endif