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39e84790 | 1 | /* |
1da177e4 LT |
2 | * iSCSI transport class definitions |
3 | * | |
4 | * Copyright (C) IBM Corporation, 2004 | |
39e84790 AA |
5 | * Copyright (C) Mike Christie, 2004 - 2005 |
6 | * Copyright (C) Dmitry Yusupov, 2004 - 2005 | |
7 | * Copyright (C) Alex Aizman, 2004 - 2005 | |
1da177e4 LT |
8 | * |
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. | |
13 | * | |
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. | |
18 | * | |
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. | |
22 | */ | |
23 | #ifndef SCSI_TRANSPORT_ISCSI_H | |
24 | #define SCSI_TRANSPORT_ISCSI_H | |
25 | ||
7b8631b5 | 26 | #include <linux/device.h> |
39e84790 | 27 | #include <scsi/iscsi_if.h> |
1da177e4 | 28 | |
7b8631b5 MC |
29 | struct scsi_transport_template; |
30 | struct Scsi_Host; | |
31 | struct mempool_zone; | |
32 | struct iscsi_cls_conn; | |
33 | ||
39e84790 AA |
34 | /** |
35 | * struct iscsi_transport - iSCSI Transport template | |
36 | * | |
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. | |
49 | * | |
50 | * Template API provided by iSCSI Transport | |
51 | */ | |
52 | struct iscsi_transport { | |
53 | struct module *owner; | |
54 | char *name; | |
55 | unsigned int caps; | |
56 | struct scsi_host_template *host_template; | |
7b8631b5 | 57 | /* LLD session/scsi_host data size */ |
39e84790 | 58 | int hostdata_size; |
7b8631b5 MC |
59 | /* LLD iscsi_host data size */ |
60 | int ihostdata_size; | |
61 | /* LLD connection data size */ | |
62 | int conndata_size; | |
b5c7a12d MC |
63 | /* LLD session data size */ |
64 | int sessiondata_size; | |
39e84790 AA |
65 | int max_lun; |
66 | unsigned int max_conn; | |
67 | unsigned int max_cmd_len; | |
7b7232f3 | 68 | struct iscsi_cls_session *(*create_session) |
b5c7a12d | 69 | (struct scsi_transport_template *t, uint32_t sn, uint32_t *hn); |
7b7232f3 MC |
70 | void (*destroy_session) (struct iscsi_cls_session *session); |
71 | struct iscsi_cls_conn *(*create_conn) (struct iscsi_cls_session *sess, | |
7b8631b5 | 72 | uint32_t cid); |
7b7232f3 MC |
73 | int (*bind_conn) (struct iscsi_cls_session *session, |
74 | struct iscsi_cls_conn *cls_conn, | |
39e84790 | 75 | uint32_t transport_fd, int is_leading); |
7b7232f3 MC |
76 | int (*start_conn) (struct iscsi_cls_conn *conn); |
77 | void (*stop_conn) (struct iscsi_cls_conn *conn, int flag); | |
7b8631b5 | 78 | void (*destroy_conn) (struct iscsi_cls_conn *conn); |
7b7232f3 | 79 | int (*set_param) (struct iscsi_cls_conn *conn, enum iscsi_param param, |
39e84790 | 80 | uint32_t value); |
7b7232f3 MC |
81 | int (*get_conn_param) (struct iscsi_cls_conn *conn, |
82 | enum iscsi_param param, | |
7b8631b5 | 83 | uint32_t *value); |
7b7232f3 | 84 | int (*get_session_param) (struct iscsi_cls_session *session, |
7b8631b5 | 85 | enum iscsi_param param, uint32_t *value); |
7b7232f3 | 86 | int (*send_pdu) (struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, |
39e84790 | 87 | char *data, uint32_t data_size); |
7b7232f3 MC |
88 | void (*get_stats) (struct iscsi_cls_conn *conn, |
89 | struct iscsi_stats *stats); | |
1da177e4 LT |
90 | }; |
91 | ||
92 | /* | |
39e84790 | 93 | * transport registration upcalls |
1da177e4 | 94 | */ |
7b8631b5 | 95 | extern struct scsi_transport_template *iscsi_register_transport(struct iscsi_transport *tt); |
39e84790 | 96 | extern int iscsi_unregister_transport(struct iscsi_transport *tt); |
1da177e4 LT |
97 | |
98 | /* | |
39e84790 | 99 | * control plane upcalls |
1da177e4 | 100 | */ |
7b7232f3 MC |
101 | extern void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error); |
102 | extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, | |
39e84790 | 103 | char *data, uint32_t data_size); |
1da177e4 | 104 | |
7b8631b5 MC |
105 | struct iscsi_cls_conn { |
106 | struct list_head conn_list; /* item in connlist */ | |
107 | void *dd_data; /* LLD private data */ | |
108 | struct iscsi_transport *transport; | |
b5c7a12d | 109 | uint32_t cid; /* connection id */ |
7b8631b5 MC |
110 | int active; /* must be accessed with the connlock */ |
111 | struct device dev; /* sysfs transport/container device */ | |
112 | struct mempool_zone *z_error; | |
113 | struct mempool_zone *z_pdu; | |
114 | struct list_head freequeue; | |
115 | }; | |
116 | ||
117 | #define iscsi_dev_to_conn(_dev) \ | |
118 | container_of(_dev, struct iscsi_cls_conn, dev) | |
119 | ||
120 | struct iscsi_cls_session { | |
7b7232f3 | 121 | struct list_head sess_list; /* item in session_list */ |
7b8631b5 | 122 | struct iscsi_transport *transport; |
b5c7a12d MC |
123 | int sid; /* session id */ |
124 | void *dd_data; /* LLD private data */ | |
7b8631b5 MC |
125 | struct device dev; /* sysfs transport/container device */ |
126 | }; | |
127 | ||
128 | #define iscsi_dev_to_session(_dev) \ | |
129 | container_of(_dev, struct iscsi_cls_session, dev) | |
130 | ||
131 | #define iscsi_session_to_shost(_session) \ | |
132 | dev_to_shost(_session->dev.parent) | |
133 | ||
134 | /* | |
135 | * session and connection functions that can be used by HW iSCSI LLDs | |
136 | */ | |
137 | extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost, | |
138 | struct iscsi_transport *t); | |
139 | extern int iscsi_destroy_session(struct iscsi_cls_session *session); | |
140 | extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess, | |
141 | uint32_t cid); | |
142 | extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn); | |
143 | ||
144 | /* | |
145 | * session functions used by software iscsi | |
146 | */ | |
147 | extern struct Scsi_Host * | |
148 | iscsi_transport_create_session(struct scsi_transport_template *scsit, | |
149 | struct iscsi_transport *transport); | |
150 | extern int iscsi_transport_destroy_session(struct Scsi_Host *shost); | |
151 | ||
1da177e4 | 152 | #endif |