[mirror_ubuntu-bionic-kernel.git] / include / scsi / scsi_transport_iscsi.h

/*
 * iSCSI transport class definitions
 *
 * Copyright (C) IBM Corporation, 2004
 * Copyright (C) Mike Christie, 2004 - 2006
 * Copyright (C) Dmitry Yusupov, 2004 - 2005
 * Copyright (C) Alex Aizman, 2004 - 2005
 *
 * 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 SCSI_TRANSPORT_ISCSI_H
#define SCSI_TRANSPORT_ISCSI_H

#include <linux/device.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <scsi/iscsi_if.h>

struct scsi_transport_template;
struct iscsi_transport;
struct iscsi_endpoint;
struct Scsi_Host;
struct scsi_cmnd;
struct iscsi_cls_conn;
struct iscsi_conn;
struct iscsi_task;
struct sockaddr;
struct iscsi_iface;
struct bsg_job;

/**
 * struct iscsi_transport - iSCSI Transport template
 *
 * @name:		transport name
 * @caps:		iSCSI Data-Path capabilities
 * @create_session:	create new iSCSI session object
 * @destroy_session:	destroy existing iSCSI session object
 * @create_conn:	create new iSCSI connection
 * @bind_conn:		associate this connection with existing iSCSI session
 *			and specified transport descriptor
 * @destroy_conn:	destroy inactive iSCSI connection
 * @set_param:		set iSCSI parameter. Return 0 on success, -ENODATA
 *			when param is not supported, and a -Exx value on other
 *			error.
 * @get_param		get iSCSI parameter. Must return number of bytes
 *			copied to buffer on success, -ENODATA when param
 *			is not supported, and a -Exx value on other error
 * @start_conn:		set connection to be operational
 * @stop_conn:		suspend/recover/terminate connection
 * @send_pdu:		send iSCSI PDU, Login, Logout, NOP-Out, Reject, Text.
 * @session_recovery_timedout: notify LLD a block during recovery timed out
 * @init_task:		Initialize a iscsi_task and any internal structs.
 *			When offloading the data path, this is called from
 *			queuecommand with the session lock, or from the
 *			iscsi_conn_send_pdu context with the session lock.
 *			When not offloading the data path, this is called
 *			from the scsi work queue without the session lock.
 * @xmit_task		Requests LLD to transfer cmd task. Returns 0 or the
 *			the number of bytes transferred on success, and -Exyz
 *			value on error. When offloading the data path, this
 *			is called from queuecommand with the session lock, or
 *			from the iscsi_conn_send_pdu context with the session
 *			lock. When not offloading the data path, this is called
 *			from the scsi work queue without the session lock.
 * @cleanup_task:	requests LLD to fail task. Called with session lock
 *			and after the connection has been suspended and
 *			terminated during recovery. If called
 *			from abort task then connection is not suspended
 *			or terminated but sk_callback_lock is held
 *
 * Template API provided by iSCSI Transport
 */
struct iscsi_transport {
	struct module *owner;
	char *name;
	unsigned int caps;

	struct iscsi_cls_session *(*create_session) (struct iscsi_endpoint *ep,
					uint16_t cmds_max, uint16_t qdepth,
					uint32_t sn);
	void (*destroy_session) (struct iscsi_cls_session *session);
	struct iscsi_cls_conn *(*create_conn) (struct iscsi_cls_session *sess,
				uint32_t cid);
	int (*bind_conn) (struct iscsi_cls_session *session,
			  struct iscsi_cls_conn *cls_conn,
			  uint64_t transport_eph, int is_leading);
	int (*start_conn) (struct iscsi_cls_conn *conn);
	void (*stop_conn) (struct iscsi_cls_conn *conn, int flag);
	void (*destroy_conn) (struct iscsi_cls_conn *conn);
	int (*set_param) (struct iscsi_cls_conn *conn, enum iscsi_param param,
			  char *buf, int buflen);
	int (*get_ep_param) (struct iscsi_endpoint *ep, enum iscsi_param param,
			     char *buf);
	int (*get_conn_param) (struct iscsi_cls_conn *conn,
			       enum iscsi_param param, char *buf);
	int (*get_session_param) (struct iscsi_cls_session *session,
				  enum iscsi_param param, char *buf);
	int (*get_host_param) (struct Scsi_Host *shost,
				enum iscsi_host_param param, char *buf);
	int (*set_host_param) (struct Scsi_Host *shost,
			       enum iscsi_host_param param, char *buf,
			       int buflen);
	int (*send_pdu) (struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
			 char *data, uint32_t data_size);
	void (*get_stats) (struct iscsi_cls_conn *conn,
			   struct iscsi_stats *stats);

	int (*init_task) (struct iscsi_task *task);
	int (*xmit_task) (struct iscsi_task *task);
	void (*cleanup_task) (struct iscsi_task *task);

	int (*alloc_pdu) (struct iscsi_task *task, uint8_t opcode);
	int (*xmit_pdu) (struct iscsi_task *task);
	int (*init_pdu) (struct iscsi_task *task, unsigned int offset,
			 unsigned int count);
	void (*parse_pdu_itt) (struct iscsi_conn *conn, itt_t itt,
			       int *index, int *age);

	void (*session_recovery_timedout) (struct iscsi_cls_session *session);
	struct iscsi_endpoint *(*ep_connect) (struct Scsi_Host *shost,
					      struct sockaddr *dst_addr,
					      int non_blocking);
	int (*ep_poll) (struct iscsi_endpoint *ep, int timeout_ms);
	void (*ep_disconnect) (struct iscsi_endpoint *ep);
	int (*tgt_dscvr) (struct Scsi_Host *shost, enum iscsi_tgt_dscvr type,
			  uint32_t enable, struct sockaddr *dst_addr);
	int (*set_path) (struct Scsi_Host *shost, struct iscsi_path *params);
	int (*set_iface_param) (struct Scsi_Host *shost, char *data, int count);
	int (*get_iface_param) (struct iscsi_iface *iface,
				enum iscsi_param_type param_type,
				int param, char *buf);
	mode_t (*attr_is_visible)(int param_type, int param);
	int (*bsg_request)(struct bsg_job *job);
};

/*
 * transport registration upcalls
 */
extern struct scsi_transport_template *iscsi_register_transport(struct iscsi_transport *tt);
extern int iscsi_unregister_transport(struct iscsi_transport *tt);

/*
 * control plane upcalls
 */
extern void iscsi_conn_error_event(struct iscsi_cls_conn *conn,
				   enum iscsi_err error);
extern void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
				   enum iscsi_conn_state state);
extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
			  char *data, uint32_t data_size);

extern int iscsi_offload_mesg(struct Scsi_Host *shost,
			      struct iscsi_transport *transport, uint32_t type,
			      char *data, uint16_t data_size);

struct iscsi_cls_conn {
	struct list_head conn_list;	/* item in connlist */
	void *dd_data;			/* LLD private data */
	struct iscsi_transport *transport;
	uint32_t cid;			/* connection id */
	struct mutex ep_mutex;
	struct iscsi_endpoint *ep;

	struct device dev;		/* sysfs transport/container device */
};

#define iscsi_dev_to_conn(_dev) \
	container_of(_dev, struct iscsi_cls_conn, dev)

#define transport_class_to_conn(_cdev) \
	iscsi_dev_to_conn(_cdev->parent)

#define iscsi_conn_to_session(_conn) \
	iscsi_dev_to_session(_conn->dev.parent)

/* iscsi class session state */
enum {
	ISCSI_SESSION_LOGGED_IN,
	ISCSI_SESSION_FAILED,
	ISCSI_SESSION_FREE,
};

#define ISCSI_MAX_TARGET -1

struct iscsi_cls_session {
	struct list_head sess_list;		/* item in session_list */
	struct iscsi_transport *transport;
	spinlock_t lock;
	struct work_struct block_work;
	struct work_struct unblock_work;
	struct work_struct scan_work;
	struct work_struct unbind_work;

	/* recovery fields */
	int recovery_tmo;
	struct delayed_work recovery_work;

	unsigned int target_id;

	int state;
	int sid;				/* session id */
	void *dd_data;				/* LLD private data */
	struct device dev;	/* sysfs transport/container device */
};

#define iscsi_dev_to_session(_dev) \
	container_of(_dev, struct iscsi_cls_session, dev)

#define transport_class_to_session(_cdev) \
	iscsi_dev_to_session(_cdev->parent)

#define iscsi_session_to_shost(_session) \
	dev_to_shost(_session->dev.parent)

#define starget_to_session(_stgt) \
	iscsi_dev_to_session(_stgt->dev.parent)

struct iscsi_cls_host {
	atomic_t nr_scans;
	struct mutex mutex;
	struct request_queue *bsg_q;
};

#define iscsi_job_to_shost(_job) \
        dev_to_shost(_job->dev)

extern void iscsi_host_for_each_session(struct Scsi_Host *shost,
				void (*fn)(struct iscsi_cls_session *));

struct iscsi_endpoint {
	void *dd_data;			/* LLD private data */
	struct device dev;
	uint64_t id;
	struct iscsi_cls_conn *conn;
};

struct iscsi_iface {
	struct device dev;
	struct iscsi_transport *transport;
	uint32_t iface_type;	/* IPv4 or IPv6 */
	uint32_t iface_num;	/* iface number, 0 - n */
	void *dd_data;		/* LLD private data */
};

#define iscsi_dev_to_iface(_dev) \
	container_of(_dev, struct iscsi_iface, dev)

#define iscsi_iface_to_shost(_iface) \
	dev_to_shost(_iface->dev.parent)

/*
 * session and connection functions that can be used by HW iSCSI LLDs
 */
#define iscsi_cls_session_printk(prefix, _cls_session, fmt, a...) \
	dev_printk(prefix, &(_cls_session)->dev, fmt, ##a)

#define iscsi_cls_conn_printk(prefix, _cls_conn, fmt, a...) \
	dev_printk(prefix, &(_cls_conn)->dev, fmt, ##a)

extern int iscsi_session_chkready(struct iscsi_cls_session *session);
extern int iscsi_is_session_online(struct iscsi_cls_session *session);
extern struct iscsi_cls_session *iscsi_alloc_session(struct Scsi_Host *shost,
				struct iscsi_transport *transport, int dd_size);
extern int iscsi_add_session(struct iscsi_cls_session *session,
			     unsigned int target_id);
extern int iscsi_session_event(struct iscsi_cls_session *session,
			       enum iscsi_uevent_e event);
extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost,
						struct iscsi_transport *t,
						int dd_size,
						unsigned int target_id);
extern void iscsi_remove_session(struct iscsi_cls_session *session);
extern void iscsi_free_session(struct iscsi_cls_session *session);
extern int iscsi_destroy_session(struct iscsi_cls_session *session);
extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess,
						int dd_size, uint32_t cid);
extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn);
extern void iscsi_unblock_session(struct iscsi_cls_session *session);
extern void iscsi_block_session(struct iscsi_cls_session *session);
extern int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time);
extern struct iscsi_endpoint *iscsi_create_endpoint(int dd_size);
extern void iscsi_destroy_endpoint(struct iscsi_endpoint *ep);
extern struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle);
extern int iscsi_block_scsi_eh(struct scsi_cmnd *cmd);
extern struct iscsi_iface *iscsi_create_iface(struct Scsi_Host *shost,
					      struct iscsi_transport *t,
					      uint32_t iface_type,
					      uint32_t iface_num, int dd_size);
extern void iscsi_destroy_iface(struct iscsi_iface *iface);
extern struct iscsi_iface *iscsi_lookup_iface(int handle);

#endif
Commit	Line	Data
39e84790	1	/*
1da177e4 LT	2	* iSCSI transport class definitions
	3	*
	4	* Copyright (C) IBM Corporation, 2004
7996a778	5	* Copyright (C) Mike Christie, 2004 - 2006
39e84790 AA	6	* Copyright (C) Dmitry Yusupov, 2004 - 2005
39e84790 AA	7	* Copyright (C) Alex Aizman, 2004 - 2005
1da177e4 LT	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 SCSI_TRANSPORT_ISCSI_H
	24	#define SCSI_TRANSPORT_ISCSI_H
	25
7b8631b5	26	#include <linux/device.h>
d773c082 MT	27	#include <linux/list.h>
d773c082 MT	28	#include <linux/mutex.h>
39e84790	29	#include <scsi/iscsi_if.h>
1da177e4	30
7b8631b5	31	struct scsi_transport_template;
7996a778	32	struct iscsi_transport;
d82ff9be	33	struct iscsi_endpoint;
7b8631b5	34	struct Scsi_Host;
c01be6dc	35	struct scsi_cmnd;
7b8631b5	36	struct iscsi_cls_conn;
7996a778	37	struct iscsi_conn;
9c19a7d0	38	struct iscsi_task;
a54a52ca	39	struct sockaddr;
8d07913d	40	struct iscsi_iface;
90eeb01a	41	struct bsg_job;
7b8631b5	42
39e84790 AA	43	/**
	44	* struct iscsi_transport - iSCSI Transport template
	45	*
	46	* @name: transport name
	47	* @caps: iSCSI Data-Path capabilities
	48	* @create_session: create new iSCSI session object
	49	* @destroy_session: destroy existing iSCSI session object
	50	* @create_conn: create new iSCSI connection
	51	* @bind_conn: associate this connection with existing iSCSI session
	52	* and specified transport descriptor
	53	* @destroy_conn: destroy inactive iSCSI connection
a54a52ca MC	54	* @set_param: set iSCSI parameter. Return 0 on success, -ENODATA
	55	* when param is not supported, and a -Exx value on other
	56	* error.
	57	* @get_param get iSCSI parameter. Must return number of bytes
	58	* copied to buffer on success, -ENODATA when param
	59	* is not supported, and a -Exx value on other error
39e84790 AA	60	* @start_conn: set connection to be operational
	61	* @stop_conn: suspend/recover/terminate connection
	62	* @send_pdu: send iSCSI PDU, Login, Logout, NOP-Out, Reject, Text.
7996a778	63	* @session_recovery_timedout: notify LLD a block during recovery timed out
3e5c28ad MC	64	* @init_task: Initialize a iscsi_task and any internal structs.
	65	* When offloading the data path, this is called from
	66	* queuecommand with the session lock, or from the
	67	* iscsi_conn_send_pdu context with the session lock.
	68	* When not offloading the data path, this is called
	69	* from the scsi work queue without the session lock.
	70	* @xmit_task Requests LLD to transfer cmd task. Returns 0 or the
3219e529	71	* the number of bytes transferred on success, and -Exyz
3e5c28ad MC	72	* value on error. When offloading the data path, this
	73	* is called from queuecommand with the session lock, or
	74	* from the iscsi_conn_send_pdu context with the session
	75	* lock. When not offloading the data path, this is called
	76	* from the scsi work queue without the session lock.
	77	* @cleanup_task: requests LLD to fail task. Called with session lock
	78	* and after the connection has been suspended and
	79	* terminated during recovery. If called
7996a778 MC	80	* from abort task then connection is not suspended
7996a778 MC	81	* or terminated but sk_callback_lock is held
39e84790 AA	82	*
	83	* Template API provided by iSCSI Transport
	84	*/
	85	struct iscsi_transport {
	86	struct module *owner;
	87	char *name;
	88	unsigned int caps;
8d07913d	89
d82ff9be	90	struct iscsi_cls_session (create_session) (struct iscsi_endpoint *ep,
75613521	91	uint16_t cmds_max, uint16_t qdepth,
5e7facb7	92	uint32_t sn);
7b7232f3 MC	93	void (destroy_session) (struct iscsi_cls_session session);
7b7232f3 MC	94	struct iscsi_cls_conn (create_conn) (struct iscsi_cls_session *sess,
7b8631b5	95	uint32_t cid);
7b7232f3 MC	96	int (bind_conn) (struct iscsi_cls_session session,
7b7232f3 MC	97	struct iscsi_cls_conn *cls_conn,
264faaaa	98	uint64_t transport_eph, int is_leading);
7b7232f3 MC	99	int (start_conn) (struct iscsi_cls_conn conn);
7b7232f3 MC	100	void (stop_conn) (struct iscsi_cls_conn conn, int flag);
7b8631b5	101	void (destroy_conn) (struct iscsi_cls_conn conn);
7b7232f3	102	int (set_param) (struct iscsi_cls_conn conn, enum iscsi_param param,
a54a52ca	103	char *buf, int buflen);
289324b0 MC	104	int (get_ep_param) (struct iscsi_endpoint ep, enum iscsi_param param,
289324b0 MC	105	char *buf);
7b7232f3	106	int (get_conn_param) (struct iscsi_cls_conn conn,
a54a52ca	107	enum iscsi_param param, char *buf);
7b7232f3	108	int (get_session_param) (struct iscsi_cls_session session,
a54a52ca	109	enum iscsi_param param, char *buf);
1819dc81 MC	110	int (get_host_param) (struct Scsi_Host shost,
1819dc81 MC	111	enum iscsi_host_param param, char *buf);
1d9bf13a MC	112	int (set_host_param) (struct Scsi_Host shost,
	113	enum iscsi_host_param param, char *buf,
	114	int buflen);
7b7232f3	115	int (send_pdu) (struct iscsi_cls_conn conn, struct iscsi_hdr *hdr,
39e84790	116	char *data, uint32_t data_size);
7b7232f3 MC	117	void (get_stats) (struct iscsi_cls_conn conn,
7b7232f3 MC	118	struct iscsi_stats *stats);
577577da	119
9c19a7d0 MC	120	int (init_task) (struct iscsi_task task);
9c19a7d0 MC	121	int (xmit_task) (struct iscsi_task task);
577577da MC	122	void (cleanup_task) (struct iscsi_task task);
577577da MC	123
2ff79d52	124	int (alloc_pdu) (struct iscsi_task task, uint8_t opcode);
577577da MC	125	int (xmit_pdu) (struct iscsi_task task);
	126	int (init_pdu) (struct iscsi_task task, unsigned int offset,
	127	unsigned int count);
262ef636 MC	128	void (parse_pdu_itt) (struct iscsi_conn conn, itt_t itt,
	129	int index, int age);
	130
30a6c652	131	void (session_recovery_timedout) (struct iscsi_cls_session session);
10eb0f01 MC	132	struct iscsi_endpoint (ep_connect) (struct Scsi_Host *shost,
10eb0f01 MC	133	struct sockaddr *dst_addr,
d82ff9be MC	134	int non_blocking);
	135	int (ep_poll) (struct iscsi_endpoint ep, int timeout_ms);
	136	void (ep_disconnect) (struct iscsi_endpoint ep);
2174a04e	137	int (tgt_dscvr) (struct Scsi_Host shost, enum iscsi_tgt_dscvr type,
01cb225d	138	uint32_t enable, struct sockaddr *dst_addr);
43514774	139	int (set_path) (struct Scsi_Host shost, struct iscsi_path *params);
56c155b5	140	int (set_iface_param) (struct Scsi_Host shost, char *data, int count);
8d07913d MC	141	int (get_iface_param) (struct iscsi_iface iface,
	142	enum iscsi_param_type param_type,
	143	int param, char *buf);
3128c6c7	144	mode_t (*attr_is_visible)(int param_type, int param);
90eeb01a	145	int (bsg_request)(struct bsg_job job);
1da177e4 LT	146	};
	147
	148	/*
39e84790	149	* transport registration upcalls
1da177e4	150	*/
7b8631b5	151	extern struct scsi_transport_template iscsi_register_transport(struct iscsi_transport tt);
39e84790	152	extern int iscsi_unregister_transport(struct iscsi_transport *tt);
1da177e4 LT	153
1da177e4 LT	154	/*
39e84790	155	* control plane upcalls
1da177e4	156	*/
e5bd7b54 MC	157	extern void iscsi_conn_error_event(struct iscsi_cls_conn *conn,
e5bd7b54 MC	158	enum iscsi_err error);
17fa575e MR	159	extern void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
17fa575e MR	160	enum iscsi_conn_state state);
7b7232f3	161	extern int iscsi_recv_pdu(struct iscsi_cls_conn conn, struct iscsi_hdr hdr,
39e84790	162	char *data, uint32_t data_size);
1da177e4	163
43514774 MC	164	extern int iscsi_offload_mesg(struct Scsi_Host *shost,
	165	struct iscsi_transport *transport, uint32_t type,
	166	char *data, uint16_t data_size);
	167
7b8631b5 MC	168	struct iscsi_cls_conn {
	169	struct list_head conn_list; /* item in connlist */
	170	void dd_data; / LLD private data */
	171	struct iscsi_transport *transport;
b5c7a12d	172	uint32_t cid; /* connection id */
22a39fbb MC	173	struct mutex ep_mutex;
22a39fbb MC	174	struct iscsi_endpoint *ep;
fd7255f5	175
7b8631b5	176	struct device dev; /* sysfs transport/container device */
7b8631b5 MC	177	};
	178
	179	#define iscsi_dev_to_conn(_dev) \
	180	container_of(_dev, struct iscsi_cls_conn, dev)
	181
3128c6c7 MC	182	#define transport_class_to_conn(_cdev) \
	183	iscsi_dev_to_conn(_cdev->parent)
	184
6eabafbe MC	185	#define iscsi_conn_to_session(_conn) \
	186	iscsi_dev_to_session(_conn->dev.parent)
	187
	188	/* iscsi class session state */
	189	enum {
	190	ISCSI_SESSION_LOGGED_IN,
	191	ISCSI_SESSION_FAILED,
	192	ISCSI_SESSION_FREE,
	193	};
7996a778	194
7970634b MC	195	#define ISCSI_MAX_TARGET -1
7970634b MC	196
7b8631b5	197	struct iscsi_cls_session {
7b7232f3	198	struct list_head sess_list; /* item in session_list */
7b8631b5	199	struct iscsi_transport *transport;
6eabafbe	200	spinlock_t lock;
45ab33b6 MC	201	struct work_struct block_work;
45ab33b6 MC	202	struct work_struct unblock_work;
bd976f62 MC	203	struct work_struct scan_work;
bd976f62 MC	204	struct work_struct unbind_work;
fd7255f5	205
30a6c652 MC	206	/* recovery fields */
30a6c652 MC	207	int recovery_tmo;
c4028958	208	struct delayed_work recovery_work;
30a6c652	209
7970634b	210	unsigned int target_id;
30a6c652	211
6eabafbe	212	int state;
b5c7a12d MC	213	int sid; /* session id */
b5c7a12d MC	214	void dd_data; / LLD private data */
7b8631b5 MC	215	struct device dev; /* sysfs transport/container device */
	216	};
	217
	218	#define iscsi_dev_to_session(_dev) \
	219	container_of(_dev, struct iscsi_cls_session, dev)
	220
1d063c17 MC	221	#define transport_class_to_session(_cdev) \
	222	iscsi_dev_to_session(_cdev->parent)
	223
7b8631b5 MC	224	#define iscsi_session_to_shost(_session) \
	225	dev_to_shost(_session->dev.parent)
	226
8434aa8b MC	227	#define starget_to_session(_stgt) \
	228	iscsi_dev_to_session(_stgt->dev.parent)
	229
32c6e1b9	230	struct iscsi_cls_host {
8aae18ad	231	atomic_t nr_scans;
30a6c652	232	struct mutex mutex;
90eeb01a	233	struct request_queue *bsg_q;
30a6c652 MC	234	};
30a6c652 MC	235
90eeb01a MC	236	#define iscsi_job_to_shost(_job) \
	237	dev_to_shost(_job->dev)
	238
a4804cd6 MC	239	extern void iscsi_host_for_each_session(struct Scsi_Host *shost,
	240	void (fn)(struct iscsi_cls_session ));
	241
d82ff9be MC	242	struct iscsi_endpoint {
	243	void dd_data; / LLD private data */
	244	struct device dev;
21536062	245	uint64_t id;
22a39fbb	246	struct iscsi_cls_conn *conn;
d82ff9be	247	};
a4804cd6	248
8d07913d MC	249	struct iscsi_iface {
	250	struct device dev;
	251	struct iscsi_transport *transport;
	252	uint32_t iface_type; /* IPv4 or IPv6 */
	253	uint32_t iface_num; /* iface number, 0 - n */
	254	void dd_data; / LLD private data */
	255	};
	256
	257	#define iscsi_dev_to_iface(_dev) \
	258	container_of(_dev, struct iscsi_iface, dev)
	259
	260	#define iscsi_iface_to_shost(_iface) \
	261	dev_to_shost(_iface->dev.parent)
	262
7b8631b5 MC	263	/*
	264	* session and connection functions that can be used by HW iSCSI LLDs
	265	*/
322d739d MC	266	#define iscsi_cls_session_printk(prefix, _cls_session, fmt, a...) \
	267	dev_printk(prefix, &(_cls_session)->dev, fmt, ##a)
	268
	269	#define iscsi_cls_conn_printk(prefix, _cls_conn, fmt, a...) \
	270	dev_printk(prefix, &(_cls_conn)->dev, fmt, ##a)
	271
6eabafbe	272	extern int iscsi_session_chkready(struct iscsi_cls_session *session);
17fa575e	273	extern int iscsi_is_session_online(struct iscsi_cls_session *session);
8434aa8b	274	extern struct iscsi_cls_session iscsi_alloc_session(struct Scsi_Host shost,
5d91e209	275	struct iscsi_transport *transport, int dd_size);
6a8a0d36 MC	276	extern int iscsi_add_session(struct iscsi_cls_session *session,
6a8a0d36 MC	277	unsigned int target_id);
26974789 MC	278	extern int iscsi_session_event(struct iscsi_cls_session *session,
26974789 MC	279	enum iscsi_uevent_e event);
7b8631b5	280	extern struct iscsi_cls_session iscsi_create_session(struct Scsi_Host shost,
6a8a0d36	281	struct iscsi_transport *t,
5d91e209	282	int dd_size,
6a8a0d36	283	unsigned int target_id);
8434aa8b MC	284	extern void iscsi_remove_session(struct iscsi_cls_session *session);
8434aa8b MC	285	extern void iscsi_free_session(struct iscsi_cls_session *session);
7b8631b5 MC	286	extern int iscsi_destroy_session(struct iscsi_cls_session *session);
7b8631b5 MC	287	extern struct iscsi_cls_conn iscsi_create_conn(struct iscsi_cls_session sess,
5d91e209	288	int dd_size, uint32_t cid);
7b8631b5	289	extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn);
30a6c652 MC	290	extern void iscsi_unblock_session(struct iscsi_cls_session *session);
30a6c652 MC	291	extern void iscsi_block_session(struct iscsi_cls_session *session);
8aae18ad	292	extern int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time);
d82ff9be MC	293	extern struct iscsi_endpoint *iscsi_create_endpoint(int dd_size);
	294	extern void iscsi_destroy_endpoint(struct iscsi_endpoint *ep);
	295	extern struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle);
c01be6dc	296	extern int iscsi_block_scsi_eh(struct scsi_cmnd *cmd);
8d07913d MC	297	extern struct iscsi_iface iscsi_create_iface(struct Scsi_Host shost,
	298	struct iscsi_transport *t,
	299	uint32_t iface_type,
	300	uint32_t iface_num, int dd_size);
	301	extern void iscsi_destroy_iface(struct iscsi_iface *iface);
	302	extern struct iscsi_iface *iscsi_lookup_iface(int handle);
53cb8a1f	303
1da177e4	304	#endif