2 * iSCSI transport class definitions
4 * Copyright (C) IBM Corporation, 2004
5 * Copyright (C) Mike Christie, 2004 - 2005
6 * Copyright (C) Dmitry Yusupov, 2004 - 2005
7 * Copyright (C) Alex Aizman, 2004 - 2005
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 #ifndef SCSI_TRANSPORT_ISCSI_H
24 #define SCSI_TRANSPORT_ISCSI_H
26 #include <linux/device.h>
27 #include <scsi/iscsi_if.h>
29 struct scsi_transport_template;
32 struct iscsi_cls_conn;
35 * struct iscsi_transport - iSCSI Transport template
37 * @name: transport name
38 * @caps: iSCSI Data-Path capabilities
39 * @create_session: create new iSCSI session object
40 * @destroy_session: destroy existing iSCSI session object
41 * @create_conn: create new iSCSI connection
42 * @bind_conn: associate this connection with existing iSCSI session
43 * and specified transport descriptor
44 * @destroy_conn: destroy inactive iSCSI connection
45 * @set_param: set iSCSI Data-Path operational parameter
46 * @start_conn: set connection to be operational
47 * @stop_conn: suspend/recover/terminate connection
48 * @send_pdu: send iSCSI PDU, Login, Logout, NOP-Out, Reject, Text.
50 * Template API provided by iSCSI Transport
52 struct iscsi_transport {
56 struct scsi_host_template *host_template;
57 /* LLD session/scsi_host data size */
59 /* LLD iscsi_host data size */
61 /* LLD connection data size */
64 unsigned int max_conn;
65 unsigned int max_cmd_len;
66 struct iscsi_cls_session *(*create_session)
67 (struct scsi_transport_template *t, uint32_t sn, uint32_t *sid);
68 void (*destroy_session) (struct iscsi_cls_session *session);
69 struct iscsi_cls_conn *(*create_conn) (struct iscsi_cls_session *sess,
71 int (*bind_conn) (struct iscsi_cls_session *session,
72 struct iscsi_cls_conn *cls_conn,
73 uint32_t transport_fd, int is_leading);
74 int (*start_conn) (struct iscsi_cls_conn *conn);
75 void (*stop_conn) (struct iscsi_cls_conn *conn, int flag);
76 void (*destroy_conn) (struct iscsi_cls_conn *conn);
77 int (*set_param) (struct iscsi_cls_conn *conn, enum iscsi_param param,
79 int (*get_conn_param) (struct iscsi_cls_conn *conn,
80 enum iscsi_param param,
82 int (*get_session_param) (struct iscsi_cls_session *session,
83 enum iscsi_param param, uint32_t *value);
84 int (*send_pdu) (struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
85 char *data, uint32_t data_size);
86 void (*get_stats) (struct iscsi_cls_conn *conn,
87 struct iscsi_stats *stats);
91 * transport registration upcalls
93 extern struct scsi_transport_template *iscsi_register_transport(struct iscsi_transport *tt);
94 extern int iscsi_unregister_transport(struct iscsi_transport *tt);
97 * control plane upcalls
99 extern void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error);
100 extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
101 char *data, uint32_t data_size);
103 struct iscsi_cls_conn {
104 struct list_head conn_list; /* item in connlist */
105 void *dd_data; /* LLD private data */
106 struct iscsi_transport *transport;
107 int active; /* must be accessed with the connlock */
108 struct device dev; /* sysfs transport/container device */
109 struct mempool_zone *z_error;
110 struct mempool_zone *z_pdu;
111 struct list_head freequeue;
114 #define iscsi_dev_to_conn(_dev) \
115 container_of(_dev, struct iscsi_cls_conn, dev)
117 struct iscsi_cls_session {
118 struct list_head sess_list; /* item in session_list */
119 struct iscsi_transport *transport;
120 struct device dev; /* sysfs transport/container device */
123 #define iscsi_dev_to_session(_dev) \
124 container_of(_dev, struct iscsi_cls_session, dev)
126 #define iscsi_session_to_shost(_session) \
127 dev_to_shost(_session->dev.parent)
130 * session and connection functions that can be used by HW iSCSI LLDs
132 extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost,
133 struct iscsi_transport *t);
134 extern int iscsi_destroy_session(struct iscsi_cls_session *session);
135 extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess,
137 extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn);
140 * session functions used by software iscsi
142 extern struct Scsi_Host *
143 iscsi_transport_create_session(struct scsi_transport_template *scsit,
144 struct iscsi_transport *transport);
145 extern int iscsi_transport_destroy_session(struct Scsi_Host *shost);