b5c7a12dc2
from hare@suse.de and michaelc@cs.wisc.edu hw iscsi like qla4xxx does not allocate a host per session and for userspace it is difficult to restart iscsid using the "iscsi handles" for the session and connection, so this patch just has the class or userspace allocate the id for the session and connection. Note: this breaks userspace and requires users to upgrade to the newest open-iscsi tools. Sorry about his but open-iscsi is still too new to say we have a stable user-kernel api and we were not good nough designers to know that other hw iscsi drivers and iscsid itself would need such changes. Actually we sorta did but at the time we did not have the HW available to us so we could only guess. Luckily, the only tools hooking into the class are the open-iscsi ones or other tools like iscsitart hook into the open-iscsi engine from userspace or prgroams like anaconda call our tools so they are not affected. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
153 lines
5.3 KiB
C
153 lines
5.3 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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/* LLD session data size */
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int sessiondata_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 iscsi_cls_session *(*create_session)
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(struct scsi_transport_template *t, 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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uint32_t transport_fd, 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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uint32_t value);
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int (*get_conn_param) (struct iscsi_cls_conn *conn,
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enum iscsi_param param,
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uint32_t *value);
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int (*get_session_param) (struct iscsi_cls_session *session,
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enum iscsi_param param, uint32_t *value);
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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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};
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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(struct iscsi_cls_conn *conn, 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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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 sess_list; /* item in session_list */
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struct iscsi_transport *transport;
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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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/*
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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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