2 * iSCSI transport class definitions
4 * Copyright (C) IBM Corporation, 2004
5 * Copyright (C) Mike Christie, 2004 - 2006
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 <linux/list.h>
28 #include <linux/mutex.h>
29 #include <scsi/iscsi_if.h>
31 struct scsi_transport_template;
32 struct iscsi_transport;
33 struct iscsi_endpoint;
36 struct iscsi_cls_conn;
43 * struct iscsi_transport - iSCSI Transport template
45 * @name: transport name
46 * @caps: iSCSI Data-Path capabilities
47 * @create_session: create new iSCSI session object
48 * @destroy_session: destroy existing iSCSI session object
49 * @create_conn: create new iSCSI connection
50 * @bind_conn: associate this connection with existing iSCSI session
51 * and specified transport descriptor
52 * @destroy_conn: destroy inactive iSCSI connection
53 * @set_param: set iSCSI parameter. Return 0 on success, -ENODATA
54 * when param is not supported, and a -Exx value on other
56 * @get_param get iSCSI parameter. Must return number of bytes
57 * copied to buffer on success, -ENODATA when param
58 * is not supported, and a -Exx value on other error
59 * @start_conn: set connection to be operational
60 * @stop_conn: suspend/recover/terminate connection
61 * @send_pdu: send iSCSI PDU, Login, Logout, NOP-Out, Reject, Text.
62 * @session_recovery_timedout: notify LLD a block during recovery timed out
63 * @init_task: Initialize a iscsi_task and any internal structs.
64 * When offloading the data path, this is called from
65 * queuecommand with the session lock, or from the
66 * iscsi_conn_send_pdu context with the session lock.
67 * When not offloading the data path, this is called
68 * from the scsi work queue without the session lock.
69 * @xmit_task Requests LLD to transfer cmd task. Returns 0 or the
70 * the number of bytes transferred on success, and -Exyz
71 * value on error. When offloading the data path, this
72 * is called from queuecommand with the session lock, or
73 * from the iscsi_conn_send_pdu context with the session
74 * lock. When not offloading the data path, this is called
75 * from the scsi work queue without the session lock.
76 * @cleanup_task: requests LLD to fail task. Called with session lock
77 * and after the connection has been suspended and
78 * terminated during recovery. If called
79 * from abort task then connection is not suspended
80 * or terminated but sk_callback_lock is held
82 * Template API provided by iSCSI Transport
84 struct iscsi_transport {
88 /* LLD sets this to indicate what values it can export to sysfs */
90 uint64_t host_param_mask;
91 uint64_t iface_param_mask;
93 struct iscsi_cls_session *(*create_session) (struct iscsi_endpoint *ep,
94 uint16_t cmds_max, uint16_t qdepth,
96 void (*destroy_session) (struct iscsi_cls_session *session);
97 struct iscsi_cls_conn *(*create_conn) (struct iscsi_cls_session *sess,
99 int (*bind_conn) (struct iscsi_cls_session *session,
100 struct iscsi_cls_conn *cls_conn,
101 uint64_t transport_eph, int is_leading);
102 int (*start_conn) (struct iscsi_cls_conn *conn);
103 void (*stop_conn) (struct iscsi_cls_conn *conn, int flag);
104 void (*destroy_conn) (struct iscsi_cls_conn *conn);
105 int (*set_param) (struct iscsi_cls_conn *conn, enum iscsi_param param,
106 char *buf, int buflen);
107 int (*get_ep_param) (struct iscsi_endpoint *ep, enum iscsi_param param,
109 int (*get_conn_param) (struct iscsi_cls_conn *conn,
110 enum iscsi_param param, char *buf);
111 int (*get_session_param) (struct iscsi_cls_session *session,
112 enum iscsi_param param, char *buf);
113 int (*get_host_param) (struct Scsi_Host *shost,
114 enum iscsi_host_param param, char *buf);
115 int (*set_host_param) (struct Scsi_Host *shost,
116 enum iscsi_host_param param, char *buf,
118 int (*send_pdu) (struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
119 char *data, uint32_t data_size);
120 void (*get_stats) (struct iscsi_cls_conn *conn,
121 struct iscsi_stats *stats);
123 int (*init_task) (struct iscsi_task *task);
124 int (*xmit_task) (struct iscsi_task *task);
125 void (*cleanup_task) (struct iscsi_task *task);
127 int (*alloc_pdu) (struct iscsi_task *task, uint8_t opcode);
128 int (*xmit_pdu) (struct iscsi_task *task);
129 int (*init_pdu) (struct iscsi_task *task, unsigned int offset,
131 void (*parse_pdu_itt) (struct iscsi_conn *conn, itt_t itt,
132 int *index, int *age);
134 void (*session_recovery_timedout) (struct iscsi_cls_session *session);
135 struct iscsi_endpoint *(*ep_connect) (struct Scsi_Host *shost,
136 struct sockaddr *dst_addr,
138 int (*ep_poll) (struct iscsi_endpoint *ep, int timeout_ms);
139 void (*ep_disconnect) (struct iscsi_endpoint *ep);
140 int (*tgt_dscvr) (struct Scsi_Host *shost, enum iscsi_tgt_dscvr type,
141 uint32_t enable, struct sockaddr *dst_addr);
142 int (*set_path) (struct Scsi_Host *shost, struct iscsi_path *params);
143 int (*set_iface_param) (struct Scsi_Host *shost, char *data, int count);
144 int (*get_iface_param) (struct iscsi_iface *iface,
145 enum iscsi_param_type param_type,
146 int param, char *buf);
147 mode_t (*attr_is_visible)(int param_type, int param);
152 * transport registration upcalls
154 extern struct scsi_transport_template *iscsi_register_transport(struct iscsi_transport *tt);
155 extern int iscsi_unregister_transport(struct iscsi_transport *tt);
158 * control plane upcalls
160 extern void iscsi_conn_error_event(struct iscsi_cls_conn *conn,
161 enum iscsi_err error);
162 extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
163 char *data, uint32_t data_size);
165 extern int iscsi_offload_mesg(struct Scsi_Host *shost,
166 struct iscsi_transport *transport, uint32_t type,
167 char *data, uint16_t data_size);
169 struct iscsi_cls_conn {
170 struct list_head conn_list; /* item in connlist */
171 void *dd_data; /* LLD private data */
172 struct iscsi_transport *transport;
173 uint32_t cid; /* connection id */
174 struct mutex ep_mutex;
175 struct iscsi_endpoint *ep;
177 struct device dev; /* sysfs transport/container device */
180 #define iscsi_dev_to_conn(_dev) \
181 container_of(_dev, struct iscsi_cls_conn, dev)
183 #define transport_class_to_conn(_cdev) \
184 iscsi_dev_to_conn(_cdev->parent)
186 #define iscsi_conn_to_session(_conn) \
187 iscsi_dev_to_session(_conn->dev.parent)
189 /* iscsi class session state */
191 ISCSI_SESSION_LOGGED_IN,
192 ISCSI_SESSION_FAILED,
196 #define ISCSI_MAX_TARGET -1
198 struct iscsi_cls_session {
199 struct list_head sess_list; /* item in session_list */
200 struct iscsi_transport *transport;
202 struct work_struct block_work;
203 struct work_struct unblock_work;
204 struct work_struct scan_work;
205 struct work_struct unbind_work;
207 /* recovery fields */
209 struct delayed_work recovery_work;
211 unsigned int target_id;
214 int sid; /* session id */
215 void *dd_data; /* LLD private data */
216 struct device dev; /* sysfs transport/container device */
219 #define iscsi_dev_to_session(_dev) \
220 container_of(_dev, struct iscsi_cls_session, dev)
222 #define iscsi_session_to_shost(_session) \
223 dev_to_shost(_session->dev.parent)
225 #define starget_to_session(_stgt) \
226 iscsi_dev_to_session(_stgt->dev.parent)
228 struct iscsi_cls_host {
233 extern void iscsi_host_for_each_session(struct Scsi_Host *shost,
234 void (*fn)(struct iscsi_cls_session *));
236 struct iscsi_endpoint {
237 void *dd_data; /* LLD private data */
240 struct iscsi_cls_conn *conn;
245 struct iscsi_transport *transport;
246 uint32_t iface_type; /* IPv4 or IPv6 */
247 uint32_t iface_num; /* iface number, 0 - n */
248 void *dd_data; /* LLD private data */
251 #define iscsi_dev_to_iface(_dev) \
252 container_of(_dev, struct iscsi_iface, dev)
254 #define iscsi_iface_to_shost(_iface) \
255 dev_to_shost(_iface->dev.parent)
258 * session and connection functions that can be used by HW iSCSI LLDs
260 #define iscsi_cls_session_printk(prefix, _cls_session, fmt, a...) \
261 dev_printk(prefix, &(_cls_session)->dev, fmt, ##a)
263 #define iscsi_cls_conn_printk(prefix, _cls_conn, fmt, a...) \
264 dev_printk(prefix, &(_cls_conn)->dev, fmt, ##a)
266 extern int iscsi_session_chkready(struct iscsi_cls_session *session);
267 extern struct iscsi_cls_session *iscsi_alloc_session(struct Scsi_Host *shost,
268 struct iscsi_transport *transport, int dd_size);
269 extern int iscsi_add_session(struct iscsi_cls_session *session,
270 unsigned int target_id);
271 extern int iscsi_session_event(struct iscsi_cls_session *session,
272 enum iscsi_uevent_e event);
273 extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost,
274 struct iscsi_transport *t,
276 unsigned int target_id);
277 extern void iscsi_remove_session(struct iscsi_cls_session *session);
278 extern void iscsi_free_session(struct iscsi_cls_session *session);
279 extern int iscsi_destroy_session(struct iscsi_cls_session *session);
280 extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess,
281 int dd_size, uint32_t cid);
282 extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn);
283 extern void iscsi_unblock_session(struct iscsi_cls_session *session);
284 extern void iscsi_block_session(struct iscsi_cls_session *session);
285 extern int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time);
286 extern struct iscsi_endpoint *iscsi_create_endpoint(int dd_size);
287 extern void iscsi_destroy_endpoint(struct iscsi_endpoint *ep);
288 extern struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle);
289 extern int iscsi_block_scsi_eh(struct scsi_cmnd *cmd);
290 extern struct iscsi_iface *iscsi_create_iface(struct Scsi_Host *shost,
291 struct iscsi_transport *t,
293 uint32_t iface_num, int dd_size);
294 extern void iscsi_destroy_iface(struct iscsi_iface *iface);
295 extern struct iscsi_iface *iscsi_lookup_iface(int handle);