237 lines
8.6 KiB
C
237 lines
8.6 KiB
C
/*
|
|
* 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 Scsi_Host;
|
|
struct iscsi_cls_conn;
|
|
struct iscsi_conn;
|
|
struct iscsi_cmd_task;
|
|
struct iscsi_mgmt_task;
|
|
struct sockaddr;
|
|
|
|
/**
|
|
* 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_cmd_task: Initialize a iscsi_cmd_task and any internal structs.
|
|
* Called from queuecommand with session lock held.
|
|
* @init_mgmt_task: Initialize a iscsi_mgmt_task and any internal structs.
|
|
* Called from iscsi_conn_send_generic with xmitmutex.
|
|
* @xmit_cmd_task: Requests LLD to transfer cmd task. Returns 0 or the
|
|
* the number of bytes transferred on success, and -Exyz
|
|
* value on error.
|
|
* @xmit_mgmt_task: Requests LLD to transfer mgmt task. Returns 0 or the
|
|
* the number of bytes transferred on success, and -Exyz
|
|
* value on error.
|
|
* @cleanup_cmd_task: requests LLD to fail cmd task. Called with xmitmutex
|
|
* and session->lock 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;
|
|
/* LLD sets this to indicate what values it can export to sysfs */
|
|
uint64_t param_mask;
|
|
uint64_t host_param_mask;
|
|
struct scsi_host_template *host_template;
|
|
/* LLD connection data size */
|
|
int conndata_size;
|
|
/* LLD session data size */
|
|
int sessiondata_size;
|
|
int max_lun;
|
|
unsigned int max_conn;
|
|
unsigned int max_cmd_len;
|
|
struct iscsi_cls_session *(*create_session) (struct iscsi_transport *it,
|
|
struct scsi_transport_template *t, uint16_t, uint16_t,
|
|
uint32_t sn, uint32_t *hn);
|
|
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_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_cmd_task) (struct iscsi_cmd_task *ctask);
|
|
void (*init_mgmt_task) (struct iscsi_conn *conn,
|
|
struct iscsi_mgmt_task *mtask);
|
|
int (*xmit_cmd_task) (struct iscsi_conn *conn,
|
|
struct iscsi_cmd_task *ctask);
|
|
void (*cleanup_cmd_task) (struct iscsi_conn *conn,
|
|
struct iscsi_cmd_task *ctask);
|
|
int (*xmit_mgmt_task) (struct iscsi_conn *conn,
|
|
struct iscsi_mgmt_task *mtask);
|
|
void (*session_recovery_timedout) (struct iscsi_cls_session *session);
|
|
int (*ep_connect) (struct sockaddr *dst_addr, int non_blocking,
|
|
uint64_t *ep_handle);
|
|
int (*ep_poll) (uint64_t ep_handle, int timeout_ms);
|
|
void (*ep_disconnect) (uint64_t ep_handle);
|
|
int (*tgt_dscvr) (struct Scsi_Host *shost, enum iscsi_tgt_dscvr type,
|
|
uint32_t enable, struct sockaddr *dst_addr);
|
|
};
|
|
|
|
/*
|
|
* 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(struct iscsi_cls_conn *conn, enum iscsi_err error);
|
|
extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
|
|
char *data, uint32_t data_size);
|
|
|
|
|
|
/* Connection's states */
|
|
#define ISCSI_CONN_INITIAL_STAGE 0
|
|
#define ISCSI_CONN_STARTED 1
|
|
#define ISCSI_CONN_STOPPED 2
|
|
#define ISCSI_CONN_CLEANUP_WAIT 3
|
|
|
|
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 */
|
|
|
|
int active; /* must be accessed with the connlock */
|
|
struct device dev; /* sysfs transport/container device */
|
|
};
|
|
|
|
#define iscsi_dev_to_conn(_dev) \
|
|
container_of(_dev, struct iscsi_cls_conn, dev)
|
|
|
|
/* Session's states */
|
|
#define ISCSI_STATE_FREE 1
|
|
#define ISCSI_STATE_LOGGED_IN 2
|
|
#define ISCSI_STATE_FAILED 3
|
|
#define ISCSI_STATE_TERMINATE 4
|
|
#define ISCSI_STATE_IN_RECOVERY 5
|
|
#define ISCSI_STATE_RECOVERY_FAILED 6
|
|
#define ISCSI_STATE_LOGGING_OUT 7
|
|
|
|
struct iscsi_cls_session {
|
|
struct list_head sess_list; /* item in session_list */
|
|
struct list_head host_list;
|
|
struct iscsi_transport *transport;
|
|
|
|
/* recovery fields */
|
|
int recovery_tmo;
|
|
struct delayed_work recovery_work;
|
|
struct work_struct unbind_work;
|
|
|
|
int target_id;
|
|
|
|
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 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_host {
|
|
struct list_head sessions;
|
|
struct mutex mutex;
|
|
struct workqueue_struct *unbind_workq;
|
|
char unbind_workq_name[KOBJ_NAME_LEN];
|
|
};
|
|
|
|
/*
|
|
* session and connection functions that can be used by HW iSCSI LLDs
|
|
*/
|
|
extern struct iscsi_cls_session *iscsi_alloc_session(struct Scsi_Host *shost,
|
|
struct iscsi_transport *transport);
|
|
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,
|
|
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,
|
|
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);
|
|
|
|
|
|
#endif
|