fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / include / scsi / scsi_transport_iscsi.h
blob7ff6199cbd55bef57c55b58b8c5a58f20a5d115a
1 /*
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 Scsi_Host;
34 struct iscsi_cls_conn;
35 struct iscsi_conn;
36 struct iscsi_cmd_task;
37 struct iscsi_mgmt_task;
38 struct sockaddr;
40 /**
41 * struct iscsi_transport - iSCSI Transport template
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
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
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.
60 * @session_recovery_timedout: notify LLD a block during recovery timed out
61 * @init_cmd_task: Initialize a iscsi_cmd_task and any internal structs.
62 * Called from queuecommand with session lock held.
63 * @init_mgmt_task: Initialize a iscsi_mgmt_task and any internal structs.
64 * Called from iscsi_conn_send_generic with xmitmutex.
65 * @xmit_cmd_task: Requests LLD to transfer cmd task. Returns 0 or the
66 * the number of bytes transferred on success, and -Exyz
67 * value on error.
68 * @xmit_mgmt_task: Requests LLD to transfer mgmt task. Returns 0 or the
69 * the number of bytes transferred on success, and -Exyz
70 * value on error.
71 * @cleanup_cmd_task: requests LLD to fail cmd task. Called with xmitmutex
72 * and session->lock after the connection has been
73 * suspended and terminated during recovery. If called
74 * from abort task then connection is not suspended
75 * or terminated but sk_callback_lock is held
77 * Template API provided by iSCSI Transport
79 struct iscsi_transport {
80 struct module *owner;
81 char *name;
82 unsigned int caps;
83 /* LLD sets this to indicate what values it can export to sysfs */
84 uint64_t param_mask;
85 uint64_t host_param_mask;
86 struct scsi_host_template *host_template;
87 /* LLD connection data size */
88 int conndata_size;
89 /* LLD session data size */
90 int sessiondata_size;
91 int max_lun;
92 unsigned int max_conn;
93 unsigned int max_cmd_len;
94 struct iscsi_cls_session *(*create_session) (struct iscsi_transport *it,
95 struct scsi_transport_template *t, uint16_t, uint16_t,
96 uint32_t sn, uint32_t *hn);
97 void (*destroy_session) (struct iscsi_cls_session *session);
98 struct iscsi_cls_conn *(*create_conn) (struct iscsi_cls_session *sess,
99 uint32_t cid);
100 int (*bind_conn) (struct iscsi_cls_session *session,
101 struct iscsi_cls_conn *cls_conn,
102 uint64_t transport_eph, int is_leading);
103 int (*start_conn) (struct iscsi_cls_conn *conn);
104 void (*stop_conn) (struct iscsi_cls_conn *conn, int flag);
105 void (*destroy_conn) (struct iscsi_cls_conn *conn);
106 int (*set_param) (struct iscsi_cls_conn *conn, enum iscsi_param param,
107 char *buf, int buflen);
108 int (*get_conn_param) (struct iscsi_cls_conn *conn,
109 enum iscsi_param param, char *buf);
110 int (*get_session_param) (struct iscsi_cls_session *session,
111 enum iscsi_param param, char *buf);
112 int (*get_host_param) (struct Scsi_Host *shost,
113 enum iscsi_host_param param, char *buf);
114 int (*set_host_param) (struct Scsi_Host *shost,
115 enum iscsi_host_param param, char *buf,
116 int buflen);
117 int (*send_pdu) (struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
118 char *data, uint32_t data_size);
119 void (*get_stats) (struct iscsi_cls_conn *conn,
120 struct iscsi_stats *stats);
121 void (*init_cmd_task) (struct iscsi_cmd_task *ctask);
122 void (*init_mgmt_task) (struct iscsi_conn *conn,
123 struct iscsi_mgmt_task *mtask);
124 int (*xmit_cmd_task) (struct iscsi_conn *conn,
125 struct iscsi_cmd_task *ctask);
126 void (*cleanup_cmd_task) (struct iscsi_conn *conn,
127 struct iscsi_cmd_task *ctask);
128 int (*xmit_mgmt_task) (struct iscsi_conn *conn,
129 struct iscsi_mgmt_task *mtask);
130 void (*session_recovery_timedout) (struct iscsi_cls_session *session);
131 int (*ep_connect) (struct sockaddr *dst_addr, int non_blocking,
132 uint64_t *ep_handle);
133 int (*ep_poll) (uint64_t ep_handle, int timeout_ms);
134 void (*ep_disconnect) (uint64_t ep_handle);
135 int (*tgt_dscvr) (struct Scsi_Host *shost, enum iscsi_tgt_dscvr type,
136 uint32_t enable, struct sockaddr *dst_addr);
140 * transport registration upcalls
142 extern struct scsi_transport_template *iscsi_register_transport(struct iscsi_transport *tt);
143 extern int iscsi_unregister_transport(struct iscsi_transport *tt);
146 * control plane upcalls
148 extern void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error);
149 extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
150 char *data, uint32_t data_size);
153 /* Connection's states */
154 #define ISCSI_CONN_INITIAL_STAGE 0
155 #define ISCSI_CONN_STARTED 1
156 #define ISCSI_CONN_STOPPED 2
157 #define ISCSI_CONN_CLEANUP_WAIT 3
159 struct iscsi_cls_conn {
160 struct list_head conn_list; /* item in connlist */
161 void *dd_data; /* LLD private data */
162 struct iscsi_transport *transport;
163 uint32_t cid; /* connection id */
165 int active; /* must be accessed with the connlock */
166 struct device dev; /* sysfs transport/container device */
169 #define iscsi_dev_to_conn(_dev) \
170 container_of(_dev, struct iscsi_cls_conn, dev)
172 /* Session's states */
173 #define ISCSI_STATE_FREE 1
174 #define ISCSI_STATE_LOGGED_IN 2
175 #define ISCSI_STATE_FAILED 3
176 #define ISCSI_STATE_TERMINATE 4
177 #define ISCSI_STATE_IN_RECOVERY 5
178 #define ISCSI_STATE_RECOVERY_FAILED 6
180 struct iscsi_cls_session {
181 struct list_head sess_list; /* item in session_list */
182 struct list_head host_list;
183 struct iscsi_transport *transport;
185 /* recovery fields */
186 int recovery_tmo;
187 struct delayed_work recovery_work;
189 int target_id;
191 int sid; /* session id */
192 void *dd_data; /* LLD private data */
193 struct device dev; /* sysfs transport/container device */
196 #define iscsi_dev_to_session(_dev) \
197 container_of(_dev, struct iscsi_cls_session, dev)
199 #define iscsi_session_to_shost(_session) \
200 dev_to_shost(_session->dev.parent)
202 #define starget_to_session(_stgt) \
203 iscsi_dev_to_session(_stgt->dev.parent)
205 struct iscsi_host {
206 struct list_head sessions;
207 struct mutex mutex;
211 * session and connection functions that can be used by HW iSCSI LLDs
213 extern struct iscsi_cls_session *iscsi_alloc_session(struct Scsi_Host *shost,
214 struct iscsi_transport *transport);
215 extern int iscsi_add_session(struct iscsi_cls_session *session,
216 unsigned int target_id);
217 extern int iscsi_if_create_session_done(struct iscsi_cls_conn *conn);
218 extern int iscsi_if_destroy_session_done(struct iscsi_cls_conn *conn);
219 extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost,
220 struct iscsi_transport *t,
221 unsigned int target_id);
222 extern void iscsi_remove_session(struct iscsi_cls_session *session);
223 extern void iscsi_free_session(struct iscsi_cls_session *session);
224 extern int iscsi_destroy_session(struct iscsi_cls_session *session);
225 extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess,
226 uint32_t cid);
227 extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn);
228 extern void iscsi_unblock_session(struct iscsi_cls_session *session);
229 extern void iscsi_block_session(struct iscsi_cls_session *session);
232 #endif