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;
42 struct iscsi_bus_flash_session;
43 struct iscsi_bus_flash_conn;
46 * struct iscsi_transport - iSCSI Transport template
48 * @name: transport name
49 * @caps: iSCSI Data-Path capabilities
50 * @create_session: create new iSCSI session object
51 * @destroy_session: destroy existing iSCSI session object
52 * @create_conn: create new iSCSI connection
53 * @bind_conn: associate this connection with existing iSCSI session
54 * and specified transport descriptor
55 * @destroy_conn: destroy inactive iSCSI connection
56 * @set_param: set iSCSI parameter. Return 0 on success, -ENODATA
57 * when param is not supported, and a -Exx value on other
59 * @get_param get iSCSI parameter. Must return number of bytes
60 * copied to buffer on success, -ENODATA when param
61 * is not supported, and a -Exx value on other error
62 * @start_conn: set connection to be operational
63 * @stop_conn: suspend/recover/terminate connection
64 * @send_pdu: send iSCSI PDU, Login, Logout, NOP-Out, Reject, Text.
65 * @session_recovery_timedout: notify LLD a block during recovery timed out
66 * @init_task: Initialize a iscsi_task and any internal structs.
67 * When offloading the data path, this is called from
68 * queuecommand with the session lock, or from the
69 * iscsi_conn_send_pdu context with the session lock.
70 * When not offloading the data path, this is called
71 * from the scsi work queue without the session lock.
72 * @xmit_task Requests LLD to transfer cmd task. Returns 0 or the
73 * the number of bytes transferred on success, and -Exyz
74 * value on error. When offloading the data path, this
75 * is called from queuecommand with the session lock, or
76 * from the iscsi_conn_send_pdu context with the session
77 * lock. When not offloading the data path, this is called
78 * from the scsi work queue without the session lock.
79 * @cleanup_task: requests LLD to fail task. Called with session lock
80 * and after the connection has been suspended and
81 * terminated during recovery. If called
82 * from abort task then connection is not suspended
83 * or terminated but sk_callback_lock is held
85 * Template API provided by iSCSI Transport
87 struct iscsi_transport {
92 struct iscsi_cls_session *(*create_session) (struct iscsi_endpoint *ep,
93 uint16_t cmds_max, uint16_t qdepth,
95 void (*destroy_session) (struct iscsi_cls_session *session);
96 struct iscsi_cls_conn *(*create_conn) (struct iscsi_cls_session *sess,
98 int (*bind_conn) (struct iscsi_cls_session *session,
99 struct iscsi_cls_conn *cls_conn,
100 uint64_t transport_eph, int is_leading);
101 int (*start_conn) (struct iscsi_cls_conn *conn);
102 void (*stop_conn) (struct iscsi_cls_conn *conn, int flag);
103 void (*destroy_conn) (struct iscsi_cls_conn *conn);
104 int (*set_param) (struct iscsi_cls_conn *conn, enum iscsi_param param,
105 char *buf, int buflen);
106 int (*get_ep_param) (struct iscsi_endpoint *ep, enum iscsi_param param,
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,
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);
122 int (*init_task) (struct iscsi_task *task);
123 int (*xmit_task) (struct iscsi_task *task);
124 void (*cleanup_task) (struct iscsi_task *task);
126 int (*alloc_pdu) (struct iscsi_task *task, uint8_t opcode);
127 int (*xmit_pdu) (struct iscsi_task *task);
128 int (*init_pdu) (struct iscsi_task *task, unsigned int offset,
130 void (*parse_pdu_itt) (struct iscsi_conn *conn, itt_t itt,
131 int *index, int *age);
133 void (*session_recovery_timedout) (struct iscsi_cls_session *session);
134 struct iscsi_endpoint *(*ep_connect) (struct Scsi_Host *shost,
135 struct sockaddr *dst_addr,
137 int (*ep_poll) (struct iscsi_endpoint *ep, int timeout_ms);
138 void (*ep_disconnect) (struct iscsi_endpoint *ep);
139 int (*tgt_dscvr) (struct Scsi_Host *shost, enum iscsi_tgt_dscvr type,
140 uint32_t enable, struct sockaddr *dst_addr);
141 int (*set_path) (struct Scsi_Host *shost, struct iscsi_path *params);
142 int (*set_iface_param) (struct Scsi_Host *shost, void *data,
144 int (*get_iface_param) (struct iscsi_iface *iface,
145 enum iscsi_param_type param_type,
146 int param, char *buf);
147 umode_t (*attr_is_visible)(int param_type, int param);
148 int (*bsg_request)(struct bsg_job *job);
149 int (*send_ping) (struct Scsi_Host *shost, uint32_t iface_num,
150 uint32_t iface_type, uint32_t payload_size,
151 uint32_t pid, struct sockaddr *dst_addr);
152 int (*get_chap) (struct Scsi_Host *shost, uint16_t chap_tbl_idx,
153 uint32_t *num_entries, char *buf);
154 int (*delete_chap) (struct Scsi_Host *shost, uint16_t chap_tbl_idx);
155 int (*get_flashnode_param) (struct iscsi_bus_flash_session *fnode_sess,
156 int param, char *buf);
157 int (*set_flashnode_param) (struct iscsi_bus_flash_session *fnode_sess,
158 struct iscsi_bus_flash_conn *fnode_conn,
159 void *data, int len);
160 int (*new_flashnode) (struct Scsi_Host *shost, const char *buf,
162 int (*del_flashnode) (struct iscsi_bus_flash_session *fnode_sess);
163 int (*login_flashnode) (struct iscsi_bus_flash_session *fnode_sess,
164 struct iscsi_bus_flash_conn *fnode_conn);
165 int (*logout_flashnode) (struct iscsi_bus_flash_session *fnode_sess,
166 struct iscsi_bus_flash_conn *fnode_conn);
167 int (*logout_flashnode_sid) (struct iscsi_cls_session *cls_sess);
171 * transport registration upcalls
173 extern struct scsi_transport_template *iscsi_register_transport(struct iscsi_transport *tt);
174 extern int iscsi_unregister_transport(struct iscsi_transport *tt);
177 * control plane upcalls
179 extern void iscsi_conn_error_event(struct iscsi_cls_conn *conn,
180 enum iscsi_err error);
181 extern void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
182 enum iscsi_conn_state state);
183 extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
184 char *data, uint32_t data_size);
186 extern int iscsi_offload_mesg(struct Scsi_Host *shost,
187 struct iscsi_transport *transport, uint32_t type,
188 char *data, uint16_t data_size);
190 extern void iscsi_post_host_event(uint32_t host_no,
191 struct iscsi_transport *transport,
192 enum iscsi_host_event_code code,
196 extern void iscsi_ping_comp_event(uint32_t host_no,
197 struct iscsi_transport *transport,
198 uint32_t status, uint32_t pid,
199 uint32_t data_size, uint8_t *data);
201 struct iscsi_cls_conn {
202 struct list_head conn_list; /* item in connlist */
203 void *dd_data; /* LLD private data */
204 struct iscsi_transport *transport;
205 uint32_t cid; /* connection id */
206 struct mutex ep_mutex;
207 struct iscsi_endpoint *ep;
209 struct device dev; /* sysfs transport/container device */
212 #define iscsi_dev_to_conn(_dev) \
213 container_of(_dev, struct iscsi_cls_conn, dev)
215 #define transport_class_to_conn(_cdev) \
216 iscsi_dev_to_conn(_cdev->parent)
218 #define iscsi_conn_to_session(_conn) \
219 iscsi_dev_to_session(_conn->dev.parent)
221 /* iscsi class session state */
223 ISCSI_SESSION_LOGGED_IN,
224 ISCSI_SESSION_FAILED,
228 #define ISCSI_MAX_TARGET -1
230 struct iscsi_cls_session {
231 struct list_head sess_list; /* item in session_list */
232 struct iscsi_transport *transport;
234 struct work_struct block_work;
235 struct work_struct unblock_work;
236 struct work_struct scan_work;
237 struct work_struct unbind_work;
239 /* recovery fields */
241 struct delayed_work recovery_work;
243 unsigned int target_id;
247 * pid of userspace process that created session or -1 if
248 * created by the kernel.
252 int sid; /* session id */
253 void *dd_data; /* LLD private data */
254 struct device dev; /* sysfs transport/container device */
257 #define iscsi_dev_to_session(_dev) \
258 container_of(_dev, struct iscsi_cls_session, dev)
260 #define transport_class_to_session(_cdev) \
261 iscsi_dev_to_session(_cdev->parent)
263 #define iscsi_session_to_shost(_session) \
264 dev_to_shost(_session->dev.parent)
266 #define starget_to_session(_stgt) \
267 iscsi_dev_to_session(_stgt->dev.parent)
269 struct iscsi_cls_host {
272 struct request_queue *bsg_q;
277 #define iscsi_job_to_shost(_job) \
278 dev_to_shost(_job->dev)
280 extern void iscsi_host_for_each_session(struct Scsi_Host *shost,
281 void (*fn)(struct iscsi_cls_session *));
283 struct iscsi_endpoint {
284 void *dd_data; /* LLD private data */
287 struct iscsi_cls_conn *conn;
292 struct iscsi_transport *transport;
293 uint32_t iface_type; /* IPv4 or IPv6 */
294 uint32_t iface_num; /* iface number, 0 - n */
295 void *dd_data; /* LLD private data */
298 #define iscsi_dev_to_iface(_dev) \
299 container_of(_dev, struct iscsi_iface, dev)
301 #define iscsi_iface_to_shost(_iface) \
302 dev_to_shost(_iface->dev.parent)
305 struct iscsi_bus_flash_conn {
306 struct list_head conn_list; /* item in connlist */
307 void *dd_data; /* LLD private data */
308 struct iscsi_transport *transport;
309 struct device dev; /* sysfs transport/container device */
310 /* iscsi connection parameters */
313 unsigned max_recv_dlength; /* initiator_max_recv_dsl*/
314 unsigned max_xmit_dlength; /* target_max_recv_dsl */
315 unsigned max_segment_size;
316 unsigned tcp_xmit_wsf;
317 unsigned tcp_recv_wsf;
322 char *link_local_ipv6_addr;
323 char *redirect_ipaddr;
324 uint16_t keepalive_timeout;
326 uint8_t snack_req_en;
327 /* tcp timestamp negotiation status */
328 uint8_t tcp_timestamp_stat;
329 uint8_t tcp_nagle_disable;
330 /* tcp window scale factor */
331 uint8_t tcp_wsf_disable;
332 uint8_t tcp_timer_scale;
333 uint8_t tcp_timestamp_en;
335 uint8_t ipv6_traffic_class;
336 uint8_t ipv6_flow_label;
337 uint8_t fragment_disable;
338 /* Link local IPv6 address is assigned by firmware or driver */
339 uint8_t is_fw_assigned_ipv6;
342 #define iscsi_dev_to_flash_conn(_dev) \
343 container_of(_dev, struct iscsi_bus_flash_conn, dev)
345 #define iscsi_flash_conn_to_flash_session(_conn) \
346 iscsi_dev_to_flash_session(_conn->dev.parent)
350 struct iscsi_bus_flash_session {
351 struct list_head sess_list; /* item in session_list */
352 struct iscsi_transport *transport;
353 unsigned int target_id;
354 int flash_state; /* persistent or non-persistent */
355 void *dd_data; /* LLD private data */
356 struct device dev; /* sysfs transport/container device */
357 /* iscsi session parameters */
358 unsigned first_burst;
360 unsigned short max_r2t;
361 int default_taskmgmt_timeout;
367 int dataseq_inorder_en;
378 uint16_t chap_in_idx;
379 uint16_t chap_out_idx;
380 /* index of iSCSI discovery session if the entry is
381 * discovered by iSCSI discovery session
383 uint16_t discovery_parent_idx;
384 /* indicates if discovery was done through iSNS discovery service
385 * or through sendTarget */
386 uint16_t discovery_parent_type;
387 /* Firmware auto sendtarget discovery disable */
388 uint8_t auto_snd_tgt_disable;
389 uint8_t discovery_sess;
390 /* indicates if this flashnode entry is enabled or disabled */
392 uint8_t chap_auth_en;
393 /* enables firmware to auto logout the discovery session on discovery
396 uint8_t discovery_logout_en;
397 uint8_t bidi_chap_en;
398 /* makes authentication for discovery session optional */
399 uint8_t discovery_auth_optional;
400 uint8_t isid[ISID_SIZE];
401 uint8_t is_boot_target;
404 #define iscsi_dev_to_flash_session(_dev) \
405 container_of(_dev, struct iscsi_bus_flash_session, dev)
407 #define iscsi_flash_session_to_shost(_session) \
408 dev_to_shost(_session->dev.parent)
411 * session and connection functions that can be used by HW iSCSI LLDs
413 #define iscsi_cls_session_printk(prefix, _cls_session, fmt, a...) \
414 dev_printk(prefix, &(_cls_session)->dev, fmt, ##a)
416 #define iscsi_cls_conn_printk(prefix, _cls_conn, fmt, a...) \
417 dev_printk(prefix, &(_cls_conn)->dev, fmt, ##a)
419 extern int iscsi_session_chkready(struct iscsi_cls_session *session);
420 extern int iscsi_is_session_online(struct iscsi_cls_session *session);
421 extern struct iscsi_cls_session *iscsi_alloc_session(struct Scsi_Host *shost,
422 struct iscsi_transport *transport, int dd_size);
423 extern int iscsi_add_session(struct iscsi_cls_session *session,
424 unsigned int target_id);
425 extern int iscsi_session_event(struct iscsi_cls_session *session,
426 enum iscsi_uevent_e event);
427 extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost,
428 struct iscsi_transport *t,
430 unsigned int target_id);
431 extern void iscsi_remove_session(struct iscsi_cls_session *session);
432 extern void iscsi_free_session(struct iscsi_cls_session *session);
433 extern int iscsi_destroy_session(struct iscsi_cls_session *session);
434 extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess,
435 int dd_size, uint32_t cid);
436 extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn);
437 extern void iscsi_unblock_session(struct iscsi_cls_session *session);
438 extern void iscsi_block_session(struct iscsi_cls_session *session);
439 extern int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time);
440 extern struct iscsi_endpoint *iscsi_create_endpoint(int dd_size);
441 extern void iscsi_destroy_endpoint(struct iscsi_endpoint *ep);
442 extern struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle);
443 extern int iscsi_block_scsi_eh(struct scsi_cmnd *cmd);
444 extern struct iscsi_iface *iscsi_create_iface(struct Scsi_Host *shost,
445 struct iscsi_transport *t,
447 uint32_t iface_num, int dd_size);
448 extern void iscsi_destroy_iface(struct iscsi_iface *iface);
449 extern struct iscsi_iface *iscsi_lookup_iface(int handle);
450 extern char *iscsi_get_port_speed_name(struct Scsi_Host *shost);
451 extern char *iscsi_get_port_state_name(struct Scsi_Host *shost);
452 extern int iscsi_is_session_dev(const struct device *dev);
454 extern char *iscsi_get_discovery_parent_name(int parent_type);
455 extern struct device *
456 iscsi_find_flashnode(struct Scsi_Host *shost, void *data,
457 int (*fn)(struct device *dev, void *data));
459 extern struct iscsi_bus_flash_session *
460 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
461 struct iscsi_transport *transport, int dd_size);
463 extern struct iscsi_bus_flash_conn *
464 iscsi_create_flashnode_conn(struct Scsi_Host *shost,
465 struct iscsi_bus_flash_session *fnode_sess,
466 struct iscsi_transport *transport, int dd_size);
469 iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess);
471 extern void iscsi_destroy_all_flashnode(struct Scsi_Host *shost);
472 extern int iscsi_flashnode_bus_match(struct device *dev,
473 struct device_driver *drv);
474 extern int iscsi_is_flashnode_conn_dev(struct device *dev, void *data);
476 extern struct device *
477 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
478 int (*fn)(struct device *dev, void *data));
480 extern struct device *
481 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess,
483 int (*fn)(struct device *dev, void *data));