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23#ifndef SCSI_TRANSPORT_ISCSI_H
24#define SCSI_TRANSPORT_ISCSI_H
25
26#include <linux/device.h>
27#include <linux/list.h>
28#include <linux/mutex.h>
29#include <scsi/iscsi_if.h>
30
31struct scsi_transport_template;
32struct iscsi_transport;
33struct iscsi_endpoint;
34struct Scsi_Host;
35struct iscsi_cls_conn;
36struct iscsi_conn;
37struct iscsi_task;
38struct sockaddr;
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82struct iscsi_transport {
83 struct module *owner;
84 char *name;
85 unsigned int caps;
86
87 uint64_t param_mask;
88 uint64_t host_param_mask;
89 struct iscsi_cls_session *(*create_session) (struct iscsi_endpoint *ep,
90 uint16_t cmds_max, uint16_t qdepth,
91 uint32_t sn);
92 void (*destroy_session) (struct iscsi_cls_session *session);
93 struct iscsi_cls_conn *(*create_conn) (struct iscsi_cls_session *sess,
94 uint32_t cid);
95 int (*bind_conn) (struct iscsi_cls_session *session,
96 struct iscsi_cls_conn *cls_conn,
97 uint64_t transport_eph, int is_leading);
98 int (*start_conn) (struct iscsi_cls_conn *conn);
99 void (*stop_conn) (struct iscsi_cls_conn *conn, int flag);
100 void (*destroy_conn) (struct iscsi_cls_conn *conn);
101 int (*set_param) (struct iscsi_cls_conn *conn, enum iscsi_param param,
102 char *buf, int buflen);
103 int (*get_conn_param) (struct iscsi_cls_conn *conn,
104 enum iscsi_param param, char *buf);
105 int (*get_session_param) (struct iscsi_cls_session *session,
106 enum iscsi_param param, char *buf);
107 int (*get_host_param) (struct Scsi_Host *shost,
108 enum iscsi_host_param param, char *buf);
109 int (*set_host_param) (struct Scsi_Host *shost,
110 enum iscsi_host_param param, char *buf,
111 int buflen);
112 int (*send_pdu) (struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
113 char *data, uint32_t data_size);
114 void (*get_stats) (struct iscsi_cls_conn *conn,
115 struct iscsi_stats *stats);
116
117 int (*init_task) (struct iscsi_task *task);
118 int (*xmit_task) (struct iscsi_task *task);
119 void (*cleanup_task) (struct iscsi_task *task);
120
121 int (*alloc_pdu) (struct iscsi_task *task, uint8_t opcode);
122 int (*xmit_pdu) (struct iscsi_task *task);
123 int (*init_pdu) (struct iscsi_task *task, unsigned int offset,
124 unsigned int count);
125 void (*parse_pdu_itt) (struct iscsi_conn *conn, itt_t itt,
126 int *index, int *age);
127
128 void (*session_recovery_timedout) (struct iscsi_cls_session *session);
129 struct iscsi_endpoint *(*ep_connect) (struct Scsi_Host *shost,
130 struct sockaddr *dst_addr,
131 int non_blocking);
132 int (*ep_poll) (struct iscsi_endpoint *ep, int timeout_ms);
133 void (*ep_disconnect) (struct iscsi_endpoint *ep);
134 int (*tgt_dscvr) (struct Scsi_Host *shost, enum iscsi_tgt_dscvr type,
135 uint32_t enable, struct sockaddr *dst_addr);
136 int (*set_path) (struct Scsi_Host *shost, struct iscsi_path *params);
137};
138
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141
142extern struct scsi_transport_template *iscsi_register_transport(struct iscsi_transport *tt);
143extern int iscsi_unregister_transport(struct iscsi_transport *tt);
144
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147
148extern void iscsi_conn_error_event(struct iscsi_cls_conn *conn,
149 enum iscsi_err error);
150extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
151 char *data, uint32_t data_size);
152
153extern int iscsi_offload_mesg(struct Scsi_Host *shost,
154 struct iscsi_transport *transport, uint32_t type,
155 char *data, uint16_t data_size);
156
157struct iscsi_cls_conn {
158 struct list_head conn_list;
159 void *dd_data;
160 struct iscsi_transport *transport;
161 uint32_t cid;
162
163 int active;
164 struct device dev;
165};
166
167#define iscsi_dev_to_conn(_dev) \
168 container_of(_dev, struct iscsi_cls_conn, dev)
169
170#define iscsi_conn_to_session(_conn) \
171 iscsi_dev_to_session(_conn->dev.parent)
172
173
174enum {
175 ISCSI_SESSION_LOGGED_IN,
176 ISCSI_SESSION_FAILED,
177 ISCSI_SESSION_FREE,
178};
179
180#define ISCSI_MAX_TARGET -1
181
182struct iscsi_cls_session {
183 struct list_head sess_list;
184 struct iscsi_transport *transport;
185 spinlock_t lock;
186 struct work_struct block_work;
187 struct work_struct unblock_work;
188 struct work_struct scan_work;
189 struct work_struct unbind_work;
190
191
192 int recovery_tmo;
193 struct delayed_work recovery_work;
194
195 unsigned int target_id;
196
197 int state;
198 int sid;
199 void *dd_data;
200 struct device dev;
201};
202
203#define iscsi_dev_to_session(_dev) \
204 container_of(_dev, struct iscsi_cls_session, dev)
205
206#define iscsi_session_to_shost(_session) \
207 dev_to_shost(_session->dev.parent)
208
209#define starget_to_session(_stgt) \
210 iscsi_dev_to_session(_stgt->dev.parent)
211
212struct iscsi_cls_host {
213 atomic_t nr_scans;
214 struct mutex mutex;
215};
216
217extern void iscsi_host_for_each_session(struct Scsi_Host *shost,
218 void (*fn)(struct iscsi_cls_session *));
219
220struct iscsi_endpoint {
221 void *dd_data;
222 struct device dev;
223 uint64_t id;
224};
225
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228
229#define iscsi_cls_session_printk(prefix, _cls_session, fmt, a...) \
230 dev_printk(prefix, &(_cls_session)->dev, fmt, ##a)
231
232#define iscsi_cls_conn_printk(prefix, _cls_conn, fmt, a...) \
233 dev_printk(prefix, &(_cls_conn)->dev, fmt, ##a)
234
235extern int iscsi_session_chkready(struct iscsi_cls_session *session);
236extern struct iscsi_cls_session *iscsi_alloc_session(struct Scsi_Host *shost,
237 struct iscsi_transport *transport, int dd_size);
238extern int iscsi_add_session(struct iscsi_cls_session *session,
239 unsigned int target_id);
240extern int iscsi_session_event(struct iscsi_cls_session *session,
241 enum iscsi_uevent_e event);
242extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost,
243 struct iscsi_transport *t,
244 int dd_size,
245 unsigned int target_id);
246extern void iscsi_remove_session(struct iscsi_cls_session *session);
247extern void iscsi_free_session(struct iscsi_cls_session *session);
248extern int iscsi_destroy_session(struct iscsi_cls_session *session);
249extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess,
250 int dd_size, uint32_t cid);
251extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn);
252extern void iscsi_unblock_session(struct iscsi_cls_session *session);
253extern void iscsi_block_session(struct iscsi_cls_session *session);
254extern int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time);
255extern struct iscsi_endpoint *iscsi_create_endpoint(int dd_size);
256extern void iscsi_destroy_endpoint(struct iscsi_endpoint *ep);
257extern struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle);
258
259#endif
260