146 lines
5.0 KiB
C
146 lines
5.0 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 - 2005
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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 <scsi/iscsi_if.h>
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struct scsi_transport_template;
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struct Scsi_Host;
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struct mempool_zone;
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struct iscsi_cls_conn;
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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 Data-Path operational parameter
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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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*
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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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struct scsi_host_template *host_template;
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/* LLD session/scsi_host data size */
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int hostdata_size;
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/* LLD iscsi_host data size */
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int ihostdata_size;
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/* LLD connection data size */
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int conndata_size;
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int max_lun;
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unsigned int max_conn;
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unsigned int max_cmd_len;
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struct Scsi_Host *(*create_session) (struct scsi_transport_template *t,
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uint32_t initial_cmdsn);
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void (*destroy_session) (struct Scsi_Host *shost);
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struct iscsi_cls_conn *(*create_conn) (struct Scsi_Host *shost,
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uint32_t cid);
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int (*bind_conn) (iscsi_sessionh_t session, iscsi_connh_t conn,
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uint32_t transport_fd, int is_leading);
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int (*start_conn) (iscsi_connh_t conn);
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void (*stop_conn) (iscsi_connh_t conn, int flag);
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void (*destroy_conn) (struct iscsi_cls_conn *conn);
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int (*set_param) (iscsi_connh_t conn, enum iscsi_param param,
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uint32_t value);
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int (*get_conn_param) (void *conndata, enum iscsi_param param,
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uint32_t *value);
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int (*get_session_param) (struct Scsi_Host *shost,
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enum iscsi_param param, uint32_t *value);
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int (*send_pdu) (iscsi_connh_t conn, struct iscsi_hdr *hdr,
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char *data, uint32_t data_size);
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void (*get_stats) (iscsi_connh_t conn, struct iscsi_stats *stats);
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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(iscsi_connh_t conn, enum iscsi_err error);
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extern int iscsi_recv_pdu(iscsi_connh_t 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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iscsi_connh_t connh;
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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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struct mempool_zone *z_error;
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struct mempool_zone *z_pdu;
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struct list_head freequeue;
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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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struct iscsi_cls_session {
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struct list_head list; /* item in session_list */
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struct iscsi_transport *transport;
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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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/*
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* session and connection functions that can be used by HW iSCSI LLDs
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*/
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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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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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uint32_t cid);
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extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn);
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/*
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* session functions used by software iscsi
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*/
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extern struct Scsi_Host *
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iscsi_transport_create_session(struct scsi_transport_template *scsit,
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struct iscsi_transport *transport);
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extern int iscsi_transport_destroy_session(struct Scsi_Host *shost);
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#endif
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