248 lines
9.1 KiB
C
248 lines
9.1 KiB
C
/*
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* iSCSI transport class definitions
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*
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* Copyright (C) IBM Corporation, 2004
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* Copyright (C) Mike Christie, 2004 - 2006
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* Copyright (C) Dmitry Yusupov, 2004 - 2005
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* Copyright (C) Alex Aizman, 2004 - 2005
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef SCSI_TRANSPORT_ISCSI_H
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#define SCSI_TRANSPORT_ISCSI_H
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#include <linux/device.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <scsi/iscsi_if.h>
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struct scsi_transport_template;
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struct iscsi_transport;
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struct iscsi_endpoint;
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struct Scsi_Host;
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struct iscsi_cls_conn;
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struct iscsi_conn;
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struct iscsi_task;
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struct sockaddr;
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/**
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* struct iscsi_transport - iSCSI Transport template
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*
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* @name: transport name
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* @caps: iSCSI Data-Path capabilities
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* @create_session: create new iSCSI session object
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* @destroy_session: destroy existing iSCSI session object
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* @create_conn: create new iSCSI connection
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* @bind_conn: associate this connection with existing iSCSI session
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* and specified transport descriptor
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* @destroy_conn: destroy inactive iSCSI connection
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* @set_param: set iSCSI parameter. Return 0 on success, -ENODATA
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* when param is not supported, and a -Exx value on other
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* error.
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* @get_param get iSCSI parameter. Must return number of bytes
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* copied to buffer on success, -ENODATA when param
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* is not supported, and a -Exx value on other error
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* @start_conn: set connection to be operational
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* @stop_conn: suspend/recover/terminate connection
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* @send_pdu: send iSCSI PDU, Login, Logout, NOP-Out, Reject, Text.
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* @session_recovery_timedout: notify LLD a block during recovery timed out
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* @init_task: Initialize a iscsi_task and any internal structs.
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* When offloading the data path, this is called from
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* queuecommand with the session lock, or from the
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* iscsi_conn_send_pdu context with the session lock.
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* When not offloading the data path, this is called
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* from the scsi work queue without the session lock.
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* @xmit_task Requests LLD to transfer cmd task. Returns 0 or the
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* the number of bytes transferred on success, and -Exyz
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* value on error. When offloading the data path, this
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* is called from queuecommand with the session lock, or
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* from the iscsi_conn_send_pdu context with the session
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* lock. When not offloading the data path, this is called
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* from the scsi work queue without the session lock.
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* @cleanup_task: requests LLD to fail task. Called with session lock
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* and after the connection has been suspended and
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* terminated during recovery. If called
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* from abort task then connection is not suspended
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* or terminated but sk_callback_lock is held
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*
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* Template API provided by iSCSI Transport
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*/
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struct iscsi_transport {
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struct module *owner;
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char *name;
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unsigned int caps;
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/* LLD sets this to indicate what values it can export to sysfs */
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uint64_t param_mask;
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uint64_t host_param_mask;
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struct iscsi_cls_session *(*create_session) (struct iscsi_endpoint *ep,
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uint16_t cmds_max, uint16_t qdepth,
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uint32_t sn, uint32_t *hn);
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void (*destroy_session) (struct iscsi_cls_session *session);
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struct iscsi_cls_conn *(*create_conn) (struct iscsi_cls_session *sess,
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uint32_t cid);
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int (*bind_conn) (struct iscsi_cls_session *session,
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struct iscsi_cls_conn *cls_conn,
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uint64_t transport_eph, int is_leading);
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int (*start_conn) (struct iscsi_cls_conn *conn);
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void (*stop_conn) (struct iscsi_cls_conn *conn, int flag);
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void (*destroy_conn) (struct iscsi_cls_conn *conn);
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int (*set_param) (struct iscsi_cls_conn *conn, enum iscsi_param param,
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char *buf, int buflen);
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int (*get_conn_param) (struct iscsi_cls_conn *conn,
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enum iscsi_param param, char *buf);
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int (*get_session_param) (struct iscsi_cls_session *session,
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enum iscsi_param param, char *buf);
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int (*get_host_param) (struct Scsi_Host *shost,
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enum iscsi_host_param param, char *buf);
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int (*set_host_param) (struct Scsi_Host *shost,
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enum iscsi_host_param param, char *buf,
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int buflen);
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int (*send_pdu) (struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
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char *data, uint32_t data_size);
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void (*get_stats) (struct iscsi_cls_conn *conn,
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struct iscsi_stats *stats);
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int (*init_task) (struct iscsi_task *task);
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int (*xmit_task) (struct iscsi_task *task);
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void (*cleanup_task) (struct iscsi_conn *conn,
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struct iscsi_task *task);
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void (*session_recovery_timedout) (struct iscsi_cls_session *session);
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struct iscsi_endpoint *(*ep_connect) (struct sockaddr *dst_addr,
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int non_blocking);
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int (*ep_poll) (struct iscsi_endpoint *ep, int timeout_ms);
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void (*ep_disconnect) (struct iscsi_endpoint *ep);
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int (*tgt_dscvr) (struct Scsi_Host *shost, enum iscsi_tgt_dscvr type,
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uint32_t enable, struct sockaddr *dst_addr);
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};
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/*
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* transport registration upcalls
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*/
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extern struct scsi_transport_template *iscsi_register_transport(struct iscsi_transport *tt);
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extern int iscsi_unregister_transport(struct iscsi_transport *tt);
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/*
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* control plane upcalls
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*/
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extern void iscsi_conn_error_event(struct iscsi_cls_conn *conn,
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enum iscsi_err error);
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extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
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char *data, uint32_t data_size);
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struct iscsi_cls_conn {
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struct list_head conn_list; /* item in connlist */
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void *dd_data; /* LLD private data */
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struct iscsi_transport *transport;
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uint32_t cid; /* connection id */
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int active; /* must be accessed with the connlock */
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struct device dev; /* sysfs transport/container device */
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};
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#define iscsi_dev_to_conn(_dev) \
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container_of(_dev, struct iscsi_cls_conn, dev)
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#define iscsi_conn_to_session(_conn) \
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iscsi_dev_to_session(_conn->dev.parent)
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/* iscsi class session state */
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enum {
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ISCSI_SESSION_LOGGED_IN,
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ISCSI_SESSION_FAILED,
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ISCSI_SESSION_FREE,
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};
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#define ISCSI_MAX_TARGET -1
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struct iscsi_cls_session {
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struct list_head sess_list; /* item in session_list */
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struct iscsi_transport *transport;
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spinlock_t lock;
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struct work_struct block_work;
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struct work_struct unblock_work;
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struct work_struct scan_work;
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struct work_struct unbind_work;
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/* recovery fields */
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int recovery_tmo;
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struct delayed_work recovery_work;
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unsigned int target_id;
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int state;
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int sid; /* session id */
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void *dd_data; /* LLD private data */
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struct device dev; /* sysfs transport/container device */
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};
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#define iscsi_dev_to_session(_dev) \
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container_of(_dev, struct iscsi_cls_session, dev)
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#define iscsi_session_to_shost(_session) \
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dev_to_shost(_session->dev.parent)
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#define starget_to_session(_stgt) \
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iscsi_dev_to_session(_stgt->dev.parent)
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struct iscsi_cls_host {
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atomic_t nr_scans;
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struct mutex mutex;
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struct workqueue_struct *scan_workq;
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char scan_workq_name[20];
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};
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extern void iscsi_host_for_each_session(struct Scsi_Host *shost,
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void (*fn)(struct iscsi_cls_session *));
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struct iscsi_endpoint {
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void *dd_data; /* LLD private data */
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struct device dev;
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uint64_t id;
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};
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/*
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* session and connection functions that can be used by HW iSCSI LLDs
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*/
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#define iscsi_cls_session_printk(prefix, _cls_session, fmt, a...) \
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dev_printk(prefix, &(_cls_session)->dev, fmt, ##a)
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#define iscsi_cls_conn_printk(prefix, _cls_conn, fmt, a...) \
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dev_printk(prefix, &(_cls_conn)->dev, fmt, ##a)
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extern int iscsi_session_chkready(struct iscsi_cls_session *session);
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extern struct iscsi_cls_session *iscsi_alloc_session(struct Scsi_Host *shost,
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struct iscsi_transport *transport, int dd_size);
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extern int iscsi_add_session(struct iscsi_cls_session *session,
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unsigned int target_id);
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extern int iscsi_session_event(struct iscsi_cls_session *session,
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enum iscsi_uevent_e event);
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extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost,
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struct iscsi_transport *t,
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int dd_size,
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unsigned int target_id);
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extern void iscsi_remove_session(struct iscsi_cls_session *session);
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extern void iscsi_free_session(struct iscsi_cls_session *session);
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extern int iscsi_destroy_session(struct iscsi_cls_session *session);
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extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess,
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int dd_size, uint32_t cid);
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extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn);
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extern void iscsi_unblock_session(struct iscsi_cls_session *session);
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extern void iscsi_block_session(struct iscsi_cls_session *session);
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extern int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time);
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extern struct iscsi_endpoint *iscsi_create_endpoint(int dd_size);
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extern void iscsi_destroy_endpoint(struct iscsi_endpoint *ep);
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extern struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle);
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#endif
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