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39e84790 | 1 | /* |
1da177e4 LT |
2 | * iSCSI transport class definitions |
3 | * | |
4 | * Copyright (C) IBM Corporation, 2004 | |
7996a778 | 5 | * Copyright (C) Mike Christie, 2004 - 2006 |
39e84790 AA |
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 | 29 | struct scsi_transport_template; |
7996a778 | 30 | struct iscsi_transport; |
7b8631b5 MC |
31 | struct Scsi_Host; |
32 | struct mempool_zone; | |
33 | struct iscsi_cls_conn; | |
7996a778 MC |
34 | struct iscsi_conn; |
35 | struct iscsi_cmd_task; | |
36 | struct iscsi_mgmt_task; | |
7b8631b5 | 37 | |
39e84790 AA |
38 | /** |
39 | * struct iscsi_transport - iSCSI Transport template | |
40 | * | |
41 | * @name: transport name | |
42 | * @caps: iSCSI Data-Path capabilities | |
43 | * @create_session: create new iSCSI session object | |
44 | * @destroy_session: destroy existing iSCSI session object | |
45 | * @create_conn: create new iSCSI connection | |
46 | * @bind_conn: associate this connection with existing iSCSI session | |
47 | * and specified transport descriptor | |
48 | * @destroy_conn: destroy inactive iSCSI connection | |
49 | * @set_param: set iSCSI Data-Path operational parameter | |
50 | * @start_conn: set connection to be operational | |
51 | * @stop_conn: suspend/recover/terminate connection | |
52 | * @send_pdu: send iSCSI PDU, Login, Logout, NOP-Out, Reject, Text. | |
7996a778 MC |
53 | * @session_recovery_timedout: notify LLD a block during recovery timed out |
54 | * @suspend_conn_recv: susepend the recv side of the connection | |
55 | * @termincate_conn: destroy socket connection. Called with mutex lock. | |
56 | * @init_cmd_task: Initialize a iscsi_cmd_task and any internal structs. | |
57 | * Called from queuecommand with session lock held. | |
58 | * @init_mgmt_task: Initialize a iscsi_mgmt_task and any internal structs. | |
59 | * Called from iscsi_conn_send_generic with xmitmutex. | |
3219e529 MC |
60 | * @xmit_cmd_task: Requests LLD to transfer cmd task. Returns 0 or the |
61 | * the number of bytes transferred on success, and -Exyz | |
62 | * value on error. | |
63 | * @xmit_mgmt_task: Requests LLD to transfer mgmt task. Returns 0 or the | |
64 | * the number of bytes transferred on success, and -Exyz | |
65 | * value on error. | |
7996a778 MC |
66 | * @cleanup_cmd_task: requests LLD to fail cmd task. Called with xmitmutex |
67 | * and session->lock after the connection has been | |
68 | * suspended and terminated during recovery. If called | |
69 | * from abort task then connection is not suspended | |
70 | * or terminated but sk_callback_lock is held | |
39e84790 AA |
71 | * |
72 | * Template API provided by iSCSI Transport | |
73 | */ | |
74 | struct iscsi_transport { | |
75 | struct module *owner; | |
76 | char *name; | |
77 | unsigned int caps; | |
fd7255f5 MC |
78 | /* LLD sets this to indicate what values it can export to sysfs */ |
79 | unsigned int param_mask; | |
39e84790 | 80 | struct scsi_host_template *host_template; |
7b8631b5 MC |
81 | /* LLD connection data size */ |
82 | int conndata_size; | |
b5c7a12d MC |
83 | /* LLD session data size */ |
84 | int sessiondata_size; | |
39e84790 AA |
85 | int max_lun; |
86 | unsigned int max_conn; | |
87 | unsigned int max_cmd_len; | |
7996a778 MC |
88 | struct iscsi_cls_session *(*create_session) (struct iscsi_transport *it, |
89 | struct scsi_transport_template *t, uint32_t sn, uint32_t *hn); | |
7b7232f3 MC |
90 | void (*destroy_session) (struct iscsi_cls_session *session); |
91 | struct iscsi_cls_conn *(*create_conn) (struct iscsi_cls_session *sess, | |
7b8631b5 | 92 | uint32_t cid); |
7b7232f3 MC |
93 | int (*bind_conn) (struct iscsi_cls_session *session, |
94 | struct iscsi_cls_conn *cls_conn, | |
264faaaa | 95 | uint64_t transport_eph, int is_leading); |
7b7232f3 MC |
96 | int (*start_conn) (struct iscsi_cls_conn *conn); |
97 | void (*stop_conn) (struct iscsi_cls_conn *conn, int flag); | |
7b8631b5 | 98 | void (*destroy_conn) (struct iscsi_cls_conn *conn); |
7b7232f3 | 99 | int (*set_param) (struct iscsi_cls_conn *conn, enum iscsi_param param, |
39e84790 | 100 | uint32_t value); |
7b7232f3 | 101 | int (*get_conn_param) (struct iscsi_cls_conn *conn, |
fd7255f5 | 102 | enum iscsi_param param, uint32_t *value); |
7b7232f3 | 103 | int (*get_session_param) (struct iscsi_cls_session *session, |
7b8631b5 | 104 | enum iscsi_param param, uint32_t *value); |
fd7255f5 MC |
105 | int (*get_conn_str_param) (struct iscsi_cls_conn *conn, |
106 | enum iscsi_param param, char *buf); | |
107 | int (*get_session_str_param) (struct iscsi_cls_session *session, | |
108 | enum iscsi_param param, char *buf); | |
7b7232f3 | 109 | int (*send_pdu) (struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, |
39e84790 | 110 | char *data, uint32_t data_size); |
7b7232f3 MC |
111 | void (*get_stats) (struct iscsi_cls_conn *conn, |
112 | struct iscsi_stats *stats); | |
7996a778 MC |
113 | void (*suspend_conn_recv) (struct iscsi_conn *conn); |
114 | void (*terminate_conn) (struct iscsi_conn *conn); | |
115 | void (*init_cmd_task) (struct iscsi_cmd_task *ctask); | |
116 | void (*init_mgmt_task) (struct iscsi_conn *conn, | |
117 | struct iscsi_mgmt_task *mtask, | |
118 | char *data, uint32_t data_size); | |
119 | int (*xmit_cmd_task) (struct iscsi_conn *conn, | |
120 | struct iscsi_cmd_task *ctask); | |
121 | void (*cleanup_cmd_task) (struct iscsi_conn *conn, | |
122 | struct iscsi_cmd_task *ctask); | |
123 | int (*xmit_mgmt_task) (struct iscsi_conn *conn, | |
124 | struct iscsi_mgmt_task *mtask); | |
30a6c652 | 125 | void (*session_recovery_timedout) (struct iscsi_cls_session *session); |
264faaaa OG |
126 | int (*ep_connect) (struct sockaddr *dst_addr, int non_blocking, |
127 | uint64_t *ep_handle); | |
128 | int (*ep_poll) (uint64_t ep_handle, int timeout_ms); | |
129 | void (*ep_disconnect) (uint64_t ep_handle); | |
1da177e4 LT |
130 | }; |
131 | ||
132 | /* | |
39e84790 | 133 | * transport registration upcalls |
1da177e4 | 134 | */ |
7b8631b5 | 135 | extern struct scsi_transport_template *iscsi_register_transport(struct iscsi_transport *tt); |
39e84790 | 136 | extern int iscsi_unregister_transport(struct iscsi_transport *tt); |
1da177e4 LT |
137 | |
138 | /* | |
39e84790 | 139 | * control plane upcalls |
1da177e4 | 140 | */ |
7b7232f3 MC |
141 | extern void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error); |
142 | extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, | |
39e84790 | 143 | char *data, uint32_t data_size); |
1da177e4 | 144 | |
7996a778 MC |
145 | |
146 | /* Connection's states */ | |
147 | #define ISCSI_CONN_INITIAL_STAGE 0 | |
148 | #define ISCSI_CONN_STARTED 1 | |
149 | #define ISCSI_CONN_STOPPED 2 | |
150 | #define ISCSI_CONN_CLEANUP_WAIT 3 | |
151 | ||
7b8631b5 MC |
152 | struct iscsi_cls_conn { |
153 | struct list_head conn_list; /* item in connlist */ | |
154 | void *dd_data; /* LLD private data */ | |
155 | struct iscsi_transport *transport; | |
b5c7a12d | 156 | uint32_t cid; /* connection id */ |
fd7255f5 MC |
157 | |
158 | /* portal/group values we got during discovery */ | |
159 | char *persistent_address; | |
160 | int persistent_port; | |
161 | /* portal/group values we are currently using */ | |
162 | char *address; | |
163 | int port; | |
164 | ||
7b8631b5 MC |
165 | int active; /* must be accessed with the connlock */ |
166 | struct device dev; /* sysfs transport/container device */ | |
167 | struct mempool_zone *z_error; | |
168 | struct mempool_zone *z_pdu; | |
169 | struct list_head freequeue; | |
170 | }; | |
171 | ||
172 | #define iscsi_dev_to_conn(_dev) \ | |
173 | container_of(_dev, struct iscsi_cls_conn, dev) | |
174 | ||
7996a778 MC |
175 | /* Session's states */ |
176 | #define ISCSI_STATE_FREE 1 | |
177 | #define ISCSI_STATE_LOGGED_IN 2 | |
178 | #define ISCSI_STATE_FAILED 3 | |
179 | #define ISCSI_STATE_TERMINATE 4 | |
656cffc9 MC |
180 | #define ISCSI_STATE_IN_RECOVERY 5 |
181 | #define ISCSI_STATE_RECOVERY_FAILED 6 | |
7996a778 | 182 | |
7b8631b5 | 183 | struct iscsi_cls_session { |
7b7232f3 | 184 | struct list_head sess_list; /* item in session_list */ |
30a6c652 | 185 | struct list_head host_list; |
7b8631b5 | 186 | struct iscsi_transport *transport; |
fd7255f5 MC |
187 | |
188 | /* iSCSI values used as unique id by userspace. */ | |
189 | char *targetname; | |
190 | int tpgt; | |
191 | ||
30a6c652 MC |
192 | /* recovery fields */ |
193 | int recovery_tmo; | |
194 | struct work_struct recovery_work; | |
195 | ||
196 | int target_id; | |
197 | int channel; | |
198 | ||
b5c7a12d MC |
199 | int sid; /* session id */ |
200 | void *dd_data; /* LLD private data */ | |
7b8631b5 MC |
201 | struct device dev; /* sysfs transport/container device */ |
202 | }; | |
203 | ||
204 | #define iscsi_dev_to_session(_dev) \ | |
205 | container_of(_dev, struct iscsi_cls_session, dev) | |
206 | ||
207 | #define iscsi_session_to_shost(_session) \ | |
208 | dev_to_shost(_session->dev.parent) | |
209 | ||
30a6c652 MC |
210 | struct iscsi_host { |
211 | int next_target_id; | |
212 | struct list_head sessions; | |
213 | struct mutex mutex; | |
214 | }; | |
215 | ||
7b8631b5 MC |
216 | /* |
217 | * session and connection functions that can be used by HW iSCSI LLDs | |
218 | */ | |
219 | extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost, | |
30a6c652 | 220 | struct iscsi_transport *t, int channel); |
7b8631b5 MC |
221 | extern int iscsi_destroy_session(struct iscsi_cls_session *session); |
222 | extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess, | |
223 | uint32_t cid); | |
224 | extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn); | |
30a6c652 MC |
225 | extern void iscsi_unblock_session(struct iscsi_cls_session *session); |
226 | extern void iscsi_block_session(struct iscsi_cls_session *session); | |
7b8631b5 | 227 | |
1da177e4 | 228 | #endif |