summaryrefslogtreecommitdiffstats
path: root/include/scsi/scsi_transport_iscsi.h
blob: b266d2a3bcb1d099ed4a16237a8f06ab820714d5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
/*
 * iSCSI transport class definitions
 *
 * Copyright (C) IBM Corporation, 2004
 * Copyright (C) Mike Christie, 2004 - 2006
 * Copyright (C) Dmitry Yusupov, 2004 - 2005
 * Copyright (C) Alex Aizman, 2004 - 2005
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
#ifndef SCSI_TRANSPORT_ISCSI_H
#define SCSI_TRANSPORT_ISCSI_H

#include <linux/device.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <scsi/iscsi_if.h>

struct scsi_transport_template;
struct iscsi_transport;
struct iscsi_endpoint;
struct Scsi_Host;
struct scsi_cmnd;
struct iscsi_cls_conn;
struct iscsi_conn;
struct iscsi_task;
struct sockaddr;
struct iscsi_iface;
struct bsg_job;
struct iscsi_bus_flash_session;
struct iscsi_bus_flash_conn;

/**
 * struct iscsi_transport - iSCSI Transport template
 *
 * @name:		transport name
 * @caps:		iSCSI Data-Path capabilities
 * @create_session:	create new iSCSI session object
 * @destroy_session:	destroy existing iSCSI session object
 * @create_conn:	create new iSCSI connection
 * @bind_conn:		associate this connection with existing iSCSI session
 *			and specified transport descriptor
 * @destroy_conn:	destroy inactive iSCSI connection
 * @set_param:		set iSCSI parameter. Return 0 on success, -ENODATA
 *			when param is not supported, and a -Exx value on other
 *			error.
 * @get_param		get iSCSI parameter. Must return number of bytes
 *			copied to buffer on success, -ENODATA when param
 *			is not supported, and a -Exx value on other error
 * @start_conn:		set connection to be operational
 * @stop_conn:		suspend/recover/terminate connection
 * @send_pdu:		send iSCSI PDU, Login, Logout, NOP-Out, Reject, Text.
 * @session_recovery_timedout: notify LLD a block during recovery timed out
 * @init_task:		Initialize a iscsi_task and any internal structs.
 *			When offloading the data path, this is called from
 *			queuecommand with the session lock, or from the
 *			iscsi_conn_send_pdu context with the session lock.
 *			When not offloading the data path, this is called
 *			from the scsi work queue without the session lock.
 * @xmit_task		Requests LLD to transfer cmd task. Returns 0 or the
 *			the number of bytes transferred on success, and -Exyz
 *			value on error. When offloading the data path, this
 *			is called from queuecommand with the session lock, or
 *			from the iscsi_conn_send_pdu context with the session
 *			lock. When not offloading the data path, this is called
 *			from the scsi work queue without the session lock.
 * @cleanup_task:	requests LLD to fail task. Called with session lock
 *			and after the connection has been suspended and
 *			terminated during recovery. If called
 *			from abort task then connection is not suspended
 *			or terminated but sk_callback_lock is held
 *
 * Template API provided by iSCSI Transport
 */
struct iscsi_transport {
	struct module *owner;
	char *name;
	unsigned int caps;

	struct iscsi_cls_session *(*create_session) (struct iscsi_endpoint *ep,
					uint16_t cmds_max, uint16_t qdepth,
					uint32_t sn);
	void (*destroy_session) (struct iscsi_cls_session *session);
	struct iscsi_cls_conn *(*create_conn) (struct iscsi_cls_session *sess,
				uint32_t cid);
	int (*bind_conn) (struct iscsi_cls_session *session,
			  struct iscsi_cls_conn *cls_conn,
			  uint64_t transport_eph, int is_leading);
	int (*start_conn) (struct iscsi_cls_conn *conn);
	void (*stop_conn) (struct iscsi_cls_conn *conn, int flag);
	void (*destroy_conn) (struct iscsi_cls_conn *conn);
	int (*set_param) (struct iscsi_cls_conn *conn, enum iscsi_param param,
			  char *buf, int buflen);
	int (*get_ep_param) (struct iscsi_endpoint *ep, enum iscsi_param param,
			     char *buf);
	int (*get_conn_param) (struct iscsi_cls_conn *conn,
			       enum iscsi_param param, char *buf);
	int (*get_session_param) (struct iscsi_cls_session *session,
				  enum iscsi_param param, char *buf);
	int (*get_host_param) (struct Scsi_Host *shost,
				enum iscsi_host_param param, char *buf);
	int (*set_host_param) (struct Scsi_Host *shost,
			       enum iscsi_host_param param, char *buf,
			       int buflen);
	int (*send_pdu) (struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
			 char *data, uint32_t data_size);
	void (*get_stats) (struct iscsi_cls_conn *conn,
			   struct iscsi_stats *stats);

	int (*init_task) (struct iscsi_task *task);
	int (*xmit_task) (struct iscsi_task *task);
	void (*cleanup_task) (struct iscsi_task *task);

	int (*alloc_pdu) (struct iscsi_task *task, uint8_t opcode);
	int (*xmit_pdu) (struct iscsi_task *task);
	int (*init_pdu) (struct iscsi_task *task, unsigned int offset,
			 unsigned int count);
	void (*parse_pdu_itt) (struct iscsi_conn *conn, itt_t itt,
			       int *index, int *age);

	void (*session_recovery_timedout) (struct iscsi_cls_session *session);
	struct iscsi_endpoint *(*ep_connect) (struct Scsi_Host *shost,
					      struct sockaddr *dst_addr,
					      int non_blocking);
	int (*ep_poll) (struct iscsi_endpoint *ep, int timeout_ms);
	void (*ep_disconnect) (struct iscsi_endpoint *ep);
	int (*tgt_dscvr) (struct Scsi_Host *shost, enum iscsi_tgt_dscvr type,
			  uint32_t enable, struct sockaddr *dst_addr);
	int (*set_path) (struct Scsi_Host *shost, struct iscsi_path *params);
	int (*set_iface_param) (struct Scsi_Host *shost, void *data,
				uint32_t len);
	int (*get_iface_param) (struct iscsi_iface *iface,
				enum iscsi_param_type param_type,
				int param, char *buf);
	umode_t (*attr_is_visible)(int param_type, int param);
	int (*bsg_request)(struct bsg_job *job);
	int (*send_ping) (struct Scsi_Host *shost, uint32_t iface_num,
			  uint32_t iface_type, uint32_t payload_size,
			  uint32_t pid, struct sockaddr *dst_addr);
	int (*get_chap) (struct Scsi_Host *shost, uint16_t chap_tbl_idx,
			 uint32_t *num_entries, char *buf);
	int (*delete_chap) (struct Scsi_Host *shost, uint16_t chap_tbl_idx);
	int (*set_chap) (struct Scsi_Host *shost, void *data, int len);
	int (*get_flashnode_param) (struct iscsi_bus_flash_session *fnode_sess,
				    int param, char *buf);
	int (*set_flashnode_param) (struct iscsi_bus_flash_session *fnode_sess,
				    struct iscsi_bus_flash_conn *fnode_conn,
				    void *data, int len);
	int (*new_flashnode) (struct Scsi_Host *shost, const char *buf,
			      int len);
	int (*del_flashnode) (struct iscsi_bus_flash_session *fnode_sess);
	int (*login_flashnode) (struct iscsi_bus_flash_session *fnode_sess,
				struct iscsi_bus_flash_conn *fnode_conn);
	int (*logout_flashnode) (struct iscsi_bus_flash_session *fnode_sess,
				 struct iscsi_bus_flash_conn *fnode_conn);
	int (*logout_flashnode_sid) (struct iscsi_cls_session *cls_sess);
	int (*get_host_stats) (struct Scsi_Host *shost, char *buf, int len);
	u8 (*check_protection)(struct iscsi_task *task, sector_t *sector);
};

/*
 * transport registration upcalls
 */
extern struct scsi_transport_template *iscsi_register_transport(struct iscsi_transport *tt);
extern int iscsi_unregister_transport(struct iscsi_transport *tt);

/*
 * control plane upcalls
 */
extern void iscsi_conn_error_event(struct iscsi_cls_conn *conn,
				   enum iscsi_err error);
extern void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
				   enum iscsi_conn_state state);
extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
			  char *data, uint32_t data_size);

extern int iscsi_offload_mesg(struct Scsi_Host *shost,
			      struct iscsi_transport *transport, uint32_t type,
			      char *data, uint16_t data_size);

extern void iscsi_post_host_event(uint32_t host_no,
				  struct iscsi_transport *transport,
				  enum iscsi_host_event_code code,
				  uint32_t data_size,
				  uint8_t *data);

extern void iscsi_ping_comp_event(uint32_t host_no,
				  struct iscsi_transport *transport,
				  uint32_t status, uint32_t pid,
				  uint32_t data_size, uint8_t *data);

struct iscsi_cls_conn {
	struct list_head conn_list;	/* item in connlist */
	void *dd_data;			/* LLD private data */
	struct iscsi_transport *transport;
	uint32_t cid;			/* connection id */
	struct mutex ep_mutex;
	struct iscsi_endpoint *ep;

	struct device dev;		/* sysfs transport/container device */
};

#define iscsi_dev_to_conn(_dev) \
	container_of(_dev, struct iscsi_cls_conn, dev)

#define transport_class_to_conn(_cdev) \
	iscsi_dev_to_conn(_cdev->parent)

#define iscsi_conn_to_session(_conn) \
	iscsi_dev_to_session(_conn->dev.parent)

/* iscsi class session state */
enum {
	ISCSI_SESSION_LOGGED_IN,
	ISCSI_SESSION_FAILED,
	ISCSI_SESSION_FREE,
};

#define ISCSI_MAX_TARGET -1

struct iscsi_cls_session {
	struct list_head sess_list;		/* item in session_list */
	struct iscsi_transport *transport;
	spinlock_t lock;
	struct work_struct block_work;
	struct work_struct unblock_work;
	struct work_struct scan_work;
	struct work_struct unbind_work;

	/* recovery fields */
	int recovery_tmo;
	bool recovery_tmo_sysfs_override;
	struct delayed_work recovery_work;

	unsigned int target_id;
	bool ida_used;

	/*
	 * pid of userspace process that created session or -1 if
	 * created by the kernel.
	 */
	pid_t creator;
	int state;
	int sid;				/* session id */
	void *dd_data;				/* LLD private data */
	struct device dev;	/* sysfs transport/container device */
};

#define iscsi_dev_to_session(_dev) \
	container_of(_dev, struct iscsi_cls_session, dev)

#define transport_class_to_session(_cdev) \
	iscsi_dev_to_session(_cdev->parent)

#define iscsi_session_to_shost(_session) \
	dev_to_shost(_session->dev.parent)

#define starget_to_session(_stgt) \
	iscsi_dev_to_session(_stgt->dev.parent)

struct iscsi_cls_host {
	atomic_t nr_scans;
	struct mutex mutex;
	struct request_queue *bsg_q;
	uint32_t port_speed;
	uint32_t port_state;
};

#define iscsi_job_to_shost(_job) \
        dev_to_shost(_job->dev)

extern void iscsi_host_for_each_session(struct Scsi_Host *shost,
				void (*fn)(struct iscsi_cls_session *));

struct iscsi_endpoint {
	void *dd_data;			/* LLD private data */
	struct device dev;
	uint64_t id;
	struct iscsi_cls_conn *conn;
};

struct iscsi_iface {
	struct device dev;
	struct iscsi_transport *transport;
	uint32_t iface_type;	/* IPv4 or IPv6 */
	uint32_t iface_num;	/* iface number, 0 - n */
	void *dd_data;		/* LLD private data */
};

#define iscsi_dev_to_iface(_dev) \
	container_of(_dev, struct iscsi_iface, dev)

#define iscsi_iface_to_shost(_iface) \
	dev_to_shost(_iface->dev.parent)


struct iscsi_bus_flash_conn {
	struct list_head conn_list;	/* item in connlist */
	void *dd_data;			/* LLD private data */
	struct iscsi_transport *transport;
	struct device dev;		/* sysfs transport/container device */
	/* iscsi connection parameters */
	uint32_t		exp_statsn;
	uint32_t		statsn;
	unsigned		max_recv_dlength; /* initiator_max_recv_dsl*/
	unsigned		max_xmit_dlength; /* target_max_recv_dsl */
	unsigned		max_segment_size;
	unsigned		tcp_xmit_wsf;
	unsigned		tcp_recv_wsf;
	int			hdrdgst_en;
	int			datadgst_en;
	int			port;
	char			*ipaddress;
	char			*link_local_ipv6_addr;
	char			*redirect_ipaddr;
	uint16_t		keepalive_timeout;
	uint16_t		local_port;
	uint8_t			snack_req_en;
	/* tcp timestamp negotiation status */
	uint8_t			tcp_timestamp_stat;
	uint8_t			tcp_nagle_disable;
	/* tcp window scale factor */
	uint8_t			tcp_wsf_disable;
	uint8_t			tcp_timer_scale;
	uint8_t			tcp_timestamp_en;
	uint8_t			ipv4_tos;
	uint8_t			ipv6_traffic_class;
	uint8_t			ipv6_flow_label;
	uint8_t			fragment_disable;
	/* Link local IPv6 address is assigned by firmware or driver */
	uint8_t			is_fw_assigned_ipv6;
};

#define iscsi_dev_to_flash_conn(_dev) \
	container_of(_dev, struct iscsi_bus_flash_conn, dev)

#define iscsi_flash_conn_to_flash_session(_conn) \
	iscsi_dev_to_flash_session(_conn->dev.parent)

#define ISID_SIZE 6

struct iscsi_bus_flash_session {
	struct list_head sess_list;		/* item in session_list */
	struct iscsi_transport *transport;
	unsigned int target_id;
	int flash_state;	/* persistent or non-persistent */
	void *dd_data;				/* LLD private data */
	struct device dev;	/* sysfs transport/container device */
	/* iscsi session parameters */
	unsigned		first_burst;
	unsigned		max_burst;
	unsigned short		max_r2t;
	int			default_taskmgmt_timeout;
	int			initial_r2t_en;
	int			imm_data_en;
	int			time2wait;
	int			time2retain;
	int			pdu_inorder_en;
	int			dataseq_inorder_en;
	int			erl;
	int			tpgt;
	char			*username;
	char			*username_in;
	char			*password;
	char			*password_in;
	char			*targetname;
	char			*targetalias;
	char			*portal_type;
	uint16_t		tsid;
	uint16_t		chap_in_idx;
	uint16_t		chap_out_idx;
	/* index of iSCSI discovery session if the entry is
	 * discovered by iSCSI discovery session
	 */
	uint16_t		discovery_parent_idx;
	/* indicates if discovery was done through iSNS discovery service
	 * or through sendTarget */
	uint16_t		discovery_parent_type;
	/* Firmware auto sendtarget discovery disable */
	uint8_t			auto_snd_tgt_disable;
	uint8_t			discovery_sess;
	/* indicates if this flashnode entry is enabled or disabled */
	uint8_t			entry_state;
	uint8_t			chap_auth_en;
	/* enables firmware to auto logout the discovery session on discovery
	 * completion
	 */
	uint8_t			discovery_logout_en;
	uint8_t			bidi_chap_en;
	/* makes authentication for discovery session optional */
	uint8_t			discovery_auth_optional;
	uint8_t			isid[ISID_SIZE];
	uint8_t			is_boot_target;
};

#define iscsi_dev_to_flash_session(_dev) \
	container_of(_dev, struct iscsi_bus_flash_session, dev)

#define iscsi_flash_session_to_shost(_session) \
	dev_to_shost(_session->dev.parent)

/*
 * session and connection functions that can be used by HW iSCSI LLDs
 */
#define iscsi_cls_session_printk(prefix, _cls_session, fmt, a...) \
	dev_printk(prefix, &(_cls_session)->dev, fmt, ##a)

#define iscsi_cls_conn_printk(prefix, _cls_conn, fmt, a...) \
	dev_printk(prefix, &(_cls_conn)->dev, fmt, ##a)

extern int iscsi_session_chkready(struct iscsi_cls_session *session);
extern int iscsi_is_session_online(struct iscsi_cls_session *session);
extern struct iscsi_cls_session *iscsi_alloc_session(struct Scsi_Host *shost,
				struct iscsi_transport *transport, int dd_size);
extern int iscsi_add_session(struct iscsi_cls_session *session,
			     unsigned int target_id);
extern int iscsi_session_event(struct iscsi_cls_session *session,
			       enum iscsi_uevent_e event);
extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost,
						struct iscsi_transport *t,
						int dd_size,
						unsigned int target_id);
extern void iscsi_remove_session(struct iscsi_cls_session *session);
extern void iscsi_free_session(struct iscsi_cls_session *session);
extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess,
						int dd_size, uint32_t cid);
extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn);
extern void iscsi_unblock_session(struct iscsi_cls_session *session);
extern void iscsi_block_session(struct iscsi_cls_session *session);
extern int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time);
extern struct iscsi_endpoint *iscsi_create_endpoint(int dd_size);
extern void iscsi_destroy_endpoint(struct iscsi_endpoint *ep);
extern struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle);
extern int iscsi_block_scsi_eh(struct scsi_cmnd *cmd);
extern struct iscsi_iface *iscsi_create_iface(struct Scsi_Host *shost,
					      struct iscsi_transport *t,
					      uint32_t iface_type,
					      uint32_t iface_num, int dd_size);
extern void iscsi_destroy_iface(struct iscsi_iface *iface);
extern struct iscsi_iface *iscsi_lookup_iface(int handle);
extern char *iscsi_get_port_speed_name(struct Scsi_Host *shost);
extern char *iscsi_get_port_state_name(struct Scsi_Host *shost);
extern int iscsi_is_session_dev(const struct device *dev);

extern char *iscsi_get_discovery_parent_name(int parent_type);
extern struct device *
iscsi_find_flashnode(struct Scsi_Host *shost, void *data,
		     int (*fn)(struct device *dev, void *data));

extern struct iscsi_bus_flash_session *
iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
			    struct iscsi_transport *transport, int dd_size);

extern struct iscsi_bus_flash_conn *
iscsi_create_flashnode_conn(struct Scsi_Host *shost,
			    struct iscsi_bus_flash_session *fnode_sess,
			    struct iscsi_transport *transport, int dd_size);

extern void
iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess);

extern void iscsi_destroy_all_flashnode(struct Scsi_Host *shost);
extern int iscsi_flashnode_bus_match(struct device *dev,
				     struct device_driver *drv);
extern struct device *
iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
			  int (*fn)(struct device *dev, void *data));
extern struct device *
iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess);

extern char *
iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state);
extern char *iscsi_get_router_state_name(enum iscsi_router_state router_state);
#endif
OpenPOWER on IntegriCloud