fd7255f51a
For iscsi boot when going from initramfs to the real root we need to stop the userpsace iscsi daemon. To later restart it iscsid needs to be able to rebuild itself and part of that process is matching a session running the kernel with the iscsid representation. To do this the attached patch adds several required iscsi values. If the LLD does not provide them becuase, login is done in userspace, then the transport class and userspace set ths up for the LLD. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
169 lines
5.8 KiB
C
169 lines
5.8 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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/* LLD sets this to indicate what values it can export to sysfs */
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unsigned int param_mask;
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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 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, 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 (*get_conn_str_param) (struct iscsi_cls_conn *conn,
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enum iscsi_param param, char *buf);
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int (*get_session_str_param) (struct iscsi_cls_session *session,
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enum iscsi_param param, char *buf);
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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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/* portal/group values we got during discovery */
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char *persistent_address;
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int persistent_port;
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/* portal/group values we are currently using */
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char *address;
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int port;
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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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/* iSCSI values used as unique id by userspace. */
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char *targetname;
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int tpgt;
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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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