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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> |
d773c082 MT |
27 | #include <linux/list.h> |
28 | #include <linux/mutex.h> | |
39e84790 | 29 | #include <scsi/iscsi_if.h> |
1da177e4 | 30 | |
7b8631b5 | 31 | struct scsi_transport_template; |
7996a778 | 32 | struct iscsi_transport; |
d82ff9be | 33 | struct iscsi_endpoint; |
7b8631b5 | 34 | struct Scsi_Host; |
7b8631b5 | 35 | struct iscsi_cls_conn; |
7996a778 | 36 | struct iscsi_conn; |
9c19a7d0 | 37 | struct iscsi_task; |
a54a52ca | 38 | struct sockaddr; |
7b8631b5 | 39 | |
39e84790 AA |
40 | /** |
41 | * struct iscsi_transport - iSCSI Transport template | |
42 | * | |
43 | * @name: transport name | |
44 | * @caps: iSCSI Data-Path capabilities | |
45 | * @create_session: create new iSCSI session object | |
46 | * @destroy_session: destroy existing iSCSI session object | |
47 | * @create_conn: create new iSCSI connection | |
48 | * @bind_conn: associate this connection with existing iSCSI session | |
49 | * and specified transport descriptor | |
50 | * @destroy_conn: destroy inactive iSCSI connection | |
a54a52ca MC |
51 | * @set_param: set iSCSI parameter. Return 0 on success, -ENODATA |
52 | * when param is not supported, and a -Exx value on other | |
53 | * error. | |
54 | * @get_param get iSCSI parameter. Must return number of bytes | |
55 | * copied to buffer on success, -ENODATA when param | |
56 | * is not supported, and a -Exx value on other error | |
39e84790 AA |
57 | * @start_conn: set connection to be operational |
58 | * @stop_conn: suspend/recover/terminate connection | |
59 | * @send_pdu: send iSCSI PDU, Login, Logout, NOP-Out, Reject, Text. | |
7996a778 | 60 | * @session_recovery_timedout: notify LLD a block during recovery timed out |
3e5c28ad MC |
61 | * @init_task: Initialize a iscsi_task and any internal structs. |
62 | * When offloading the data path, this is called from | |
63 | * queuecommand with the session lock, or from the | |
64 | * iscsi_conn_send_pdu context with the session lock. | |
65 | * When not offloading the data path, this is called | |
66 | * from the scsi work queue without the session lock. | |
67 | * @xmit_task Requests LLD to transfer cmd task. Returns 0 or the | |
3219e529 | 68 | * the number of bytes transferred on success, and -Exyz |
3e5c28ad MC |
69 | * value on error. When offloading the data path, this |
70 | * is called from queuecommand with the session lock, or | |
71 | * from the iscsi_conn_send_pdu context with the session | |
72 | * lock. When not offloading the data path, this is called | |
73 | * from the scsi work queue without the session lock. | |
74 | * @cleanup_task: requests LLD to fail task. Called with session lock | |
75 | * and after the connection has been suspended and | |
76 | * terminated during recovery. If called | |
7996a778 MC |
77 | * from abort task then connection is not suspended |
78 | * or terminated but sk_callback_lock is held | |
39e84790 AA |
79 | * |
80 | * Template API provided by iSCSI Transport | |
81 | */ | |
82 | struct iscsi_transport { | |
83 | struct module *owner; | |
84 | char *name; | |
85 | unsigned int caps; | |
fd7255f5 | 86 | /* LLD sets this to indicate what values it can export to sysfs */ |
1819dc81 MC |
87 | uint64_t param_mask; |
88 | uint64_t host_param_mask; | |
d82ff9be | 89 | struct iscsi_cls_session *(*create_session) (struct iscsi_endpoint *ep, |
75613521 MC |
90 | uint16_t cmds_max, uint16_t qdepth, |
91 | uint32_t sn, uint32_t *hn); | |
7b7232f3 MC |
92 | void (*destroy_session) (struct iscsi_cls_session *session); |
93 | struct iscsi_cls_conn *(*create_conn) (struct iscsi_cls_session *sess, | |
7b8631b5 | 94 | uint32_t cid); |
7b7232f3 MC |
95 | int (*bind_conn) (struct iscsi_cls_session *session, |
96 | struct iscsi_cls_conn *cls_conn, | |
264faaaa | 97 | uint64_t transport_eph, int is_leading); |
7b7232f3 MC |
98 | int (*start_conn) (struct iscsi_cls_conn *conn); |
99 | void (*stop_conn) (struct iscsi_cls_conn *conn, int flag); | |
7b8631b5 | 100 | void (*destroy_conn) (struct iscsi_cls_conn *conn); |
7b7232f3 | 101 | int (*set_param) (struct iscsi_cls_conn *conn, enum iscsi_param param, |
a54a52ca | 102 | char *buf, int buflen); |
7b7232f3 | 103 | int (*get_conn_param) (struct iscsi_cls_conn *conn, |
a54a52ca | 104 | enum iscsi_param param, char *buf); |
7b7232f3 | 105 | int (*get_session_param) (struct iscsi_cls_session *session, |
a54a52ca | 106 | enum iscsi_param param, char *buf); |
1819dc81 MC |
107 | int (*get_host_param) (struct Scsi_Host *shost, |
108 | enum iscsi_host_param param, char *buf); | |
1d9bf13a MC |
109 | int (*set_host_param) (struct Scsi_Host *shost, |
110 | enum iscsi_host_param param, char *buf, | |
111 | int buflen); | |
7b7232f3 | 112 | int (*send_pdu) (struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, |
39e84790 | 113 | char *data, uint32_t data_size); |
7b7232f3 MC |
114 | void (*get_stats) (struct iscsi_cls_conn *conn, |
115 | struct iscsi_stats *stats); | |
9c19a7d0 MC |
116 | int (*init_task) (struct iscsi_task *task); |
117 | int (*xmit_task) (struct iscsi_task *task); | |
3e5c28ad | 118 | void (*cleanup_task) (struct iscsi_conn *conn, |
9c19a7d0 | 119 | struct iscsi_task *task); |
30a6c652 | 120 | void (*session_recovery_timedout) (struct iscsi_cls_session *session); |
d82ff9be MC |
121 | struct iscsi_endpoint *(*ep_connect) (struct sockaddr *dst_addr, |
122 | int non_blocking); | |
123 | int (*ep_poll) (struct iscsi_endpoint *ep, int timeout_ms); | |
124 | void (*ep_disconnect) (struct iscsi_endpoint *ep); | |
2174a04e | 125 | int (*tgt_dscvr) (struct Scsi_Host *shost, enum iscsi_tgt_dscvr type, |
01cb225d | 126 | uint32_t enable, struct sockaddr *dst_addr); |
1da177e4 LT |
127 | }; |
128 | ||
129 | /* | |
39e84790 | 130 | * transport registration upcalls |
1da177e4 | 131 | */ |
7b8631b5 | 132 | extern struct scsi_transport_template *iscsi_register_transport(struct iscsi_transport *tt); |
39e84790 | 133 | extern int iscsi_unregister_transport(struct iscsi_transport *tt); |
1da177e4 LT |
134 | |
135 | /* | |
39e84790 | 136 | * control plane upcalls |
1da177e4 | 137 | */ |
e5bd7b54 MC |
138 | extern void iscsi_conn_error_event(struct iscsi_cls_conn *conn, |
139 | enum iscsi_err error); | |
7b7232f3 | 140 | extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, |
39e84790 | 141 | char *data, uint32_t data_size); |
1da177e4 | 142 | |
7b8631b5 MC |
143 | struct iscsi_cls_conn { |
144 | struct list_head conn_list; /* item in connlist */ | |
145 | void *dd_data; /* LLD private data */ | |
146 | struct iscsi_transport *transport; | |
b5c7a12d | 147 | uint32_t cid; /* connection id */ |
fd7255f5 | 148 | |
7b8631b5 MC |
149 | int active; /* must be accessed with the connlock */ |
150 | struct device dev; /* sysfs transport/container device */ | |
7b8631b5 MC |
151 | }; |
152 | ||
153 | #define iscsi_dev_to_conn(_dev) \ | |
154 | container_of(_dev, struct iscsi_cls_conn, dev) | |
155 | ||
6eabafbe MC |
156 | #define iscsi_conn_to_session(_conn) \ |
157 | iscsi_dev_to_session(_conn->dev.parent) | |
158 | ||
159 | /* iscsi class session state */ | |
160 | enum { | |
161 | ISCSI_SESSION_LOGGED_IN, | |
162 | ISCSI_SESSION_FAILED, | |
163 | ISCSI_SESSION_FREE, | |
164 | }; | |
7996a778 | 165 | |
7970634b MC |
166 | #define ISCSI_MAX_TARGET -1 |
167 | ||
7b8631b5 | 168 | struct iscsi_cls_session { |
7b7232f3 | 169 | struct list_head sess_list; /* item in session_list */ |
7b8631b5 | 170 | struct iscsi_transport *transport; |
6eabafbe | 171 | spinlock_t lock; |
45ab33b6 MC |
172 | struct work_struct block_work; |
173 | struct work_struct unblock_work; | |
bd976f62 MC |
174 | struct work_struct scan_work; |
175 | struct work_struct unbind_work; | |
fd7255f5 | 176 | |
30a6c652 MC |
177 | /* recovery fields */ |
178 | int recovery_tmo; | |
c4028958 | 179 | struct delayed_work recovery_work; |
30a6c652 | 180 | |
7970634b | 181 | unsigned int target_id; |
30a6c652 | 182 | |
6eabafbe | 183 | int state; |
b5c7a12d MC |
184 | int sid; /* session id */ |
185 | void *dd_data; /* LLD private data */ | |
7b8631b5 MC |
186 | struct device dev; /* sysfs transport/container device */ |
187 | }; | |
188 | ||
189 | #define iscsi_dev_to_session(_dev) \ | |
190 | container_of(_dev, struct iscsi_cls_session, dev) | |
191 | ||
192 | #define iscsi_session_to_shost(_session) \ | |
193 | dev_to_shost(_session->dev.parent) | |
194 | ||
8434aa8b MC |
195 | #define starget_to_session(_stgt) \ |
196 | iscsi_dev_to_session(_stgt->dev.parent) | |
197 | ||
32c6e1b9 | 198 | struct iscsi_cls_host { |
8aae18ad | 199 | atomic_t nr_scans; |
30a6c652 | 200 | struct mutex mutex; |
bd976f62 | 201 | struct workqueue_struct *scan_workq; |
aab0de24 | 202 | char scan_workq_name[20]; |
30a6c652 MC |
203 | }; |
204 | ||
a4804cd6 MC |
205 | extern void iscsi_host_for_each_session(struct Scsi_Host *shost, |
206 | void (*fn)(struct iscsi_cls_session *)); | |
207 | ||
d82ff9be MC |
208 | struct iscsi_endpoint { |
209 | void *dd_data; /* LLD private data */ | |
210 | struct device dev; | |
21536062 | 211 | uint64_t id; |
d82ff9be | 212 | }; |
a4804cd6 | 213 | |
7b8631b5 MC |
214 | /* |
215 | * session and connection functions that can be used by HW iSCSI LLDs | |
216 | */ | |
322d739d MC |
217 | #define iscsi_cls_session_printk(prefix, _cls_session, fmt, a...) \ |
218 | dev_printk(prefix, &(_cls_session)->dev, fmt, ##a) | |
219 | ||
220 | #define iscsi_cls_conn_printk(prefix, _cls_conn, fmt, a...) \ | |
221 | dev_printk(prefix, &(_cls_conn)->dev, fmt, ##a) | |
222 | ||
6eabafbe | 223 | extern int iscsi_session_chkready(struct iscsi_cls_session *session); |
8434aa8b | 224 | extern struct iscsi_cls_session *iscsi_alloc_session(struct Scsi_Host *shost, |
5d91e209 | 225 | struct iscsi_transport *transport, int dd_size); |
6a8a0d36 MC |
226 | extern int iscsi_add_session(struct iscsi_cls_session *session, |
227 | unsigned int target_id); | |
26974789 MC |
228 | extern int iscsi_session_event(struct iscsi_cls_session *session, |
229 | enum iscsi_uevent_e event); | |
7b8631b5 | 230 | extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost, |
6a8a0d36 | 231 | struct iscsi_transport *t, |
5d91e209 | 232 | int dd_size, |
6a8a0d36 | 233 | unsigned int target_id); |
8434aa8b MC |
234 | extern void iscsi_remove_session(struct iscsi_cls_session *session); |
235 | extern void iscsi_free_session(struct iscsi_cls_session *session); | |
7b8631b5 MC |
236 | extern int iscsi_destroy_session(struct iscsi_cls_session *session); |
237 | extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess, | |
5d91e209 | 238 | int dd_size, uint32_t cid); |
7b8631b5 | 239 | extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn); |
30a6c652 MC |
240 | extern void iscsi_unblock_session(struct iscsi_cls_session *session); |
241 | extern void iscsi_block_session(struct iscsi_cls_session *session); | |
8aae18ad | 242 | extern int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time); |
d82ff9be MC |
243 | extern struct iscsi_endpoint *iscsi_create_endpoint(int dd_size); |
244 | extern void iscsi_destroy_endpoint(struct iscsi_endpoint *ep); | |
245 | extern struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle); | |
53cb8a1f | 246 | |
1da177e4 | 247 | #endif |