aboutsummaryrefslogtreecommitdiffstats
path: root/include/net/iucv/iucv.h
blob: 205a3360156ed46d43a077e3cfabac1647ce236f (plain) (blame)
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
/*
 *  drivers/s390/net/iucv.h
 *    IUCV base support.
 *
 *  S390 version
 *    Copyright 2000, 2006 IBM Corporation
 *    Author(s):Alan Altmark (Alan_Altmark@us.ibm.com)
 *		Xenia Tkatschow (xenia@us.ibm.com)
 *    Rewritten for af_iucv:
 *	Martin Schwidefsky <schwidefsky@de.ibm.com>
 *
 *
 * Functionality:
 * To explore any of the IUCV functions, one must first register their
 * program using iucv_register(). Once your program has successfully
 * completed a register, it can exploit the other functions.
 * For furthur reference on all IUCV functionality, refer to the
 * CP Programming Services book, also available on the web thru
 * www.vm.ibm.com/pubs, manual # SC24-6084
 *
 * Definition of Return Codes
 * - All positive return codes including zero are reflected back
 *   from CP. The definition of each return code can be found in
 *   CP Programming Services book.
 * - Return Code of:
 *   -EINVAL: Invalid value
 *   -ENOMEM: storage allocation failed
 */

#include <linux/types.h>
#include <linux/slab.h>
#include <asm/debug.h>

/*
 * IUCV option flags usable by device drivers:
 *
 * IUCV_IPRMDATA  Indicates that your program can handle a message in the
 *		  parameter list / a message is sent in the parameter list.
 *		  Used for iucv_path_accept, iucv_path_connect,
 *		  iucv_message_reply, iucv_message_send, iucv_message_send2way.
 * IUCV_IPQUSCE	  Indicates that you do not want to receive messages on this
 *		  path until an iucv_path_resume is issued.
 *		  Used for iucv_path_accept, iucv_path_connect.
 * IUCV_IPBUFLST  Indicates that an address list is used for the message data.
 *		  Used for iucv_message_receive, iucv_message_send,
 *		  iucv_message_send2way.
 * IUCV_IPPRTY	  Specifies that you want to send priority messages.
 *		  Used for iucv_path_accept, iucv_path_connect,
 *		  iucv_message_reply, iucv_message_send, iucv_message_send2way.
 * IUCV_IPSYNC	  Indicates a synchronous send request.
 *		  Used for iucv_message_send, iucv_message_send2way.
 * IUCV_IPANSLST  Indicates that an address list is used for the reply data.
 *		  Used for iucv_message_reply, iucv_message_send2way.
 * IUCV_IPLOCAL	  Specifies that the communication partner has to be on the
 *		  local system. If local is specified no target class can be
 *		  specified.
 *		  Used for iucv_path_connect.
 *
 * All flags are defined in the input field IPFLAGS1 of each function
 * and can be found in CP Programming Services.
 */
#define IUCV_IPRMDATA	0x80
#define IUCV_IPQUSCE	0x40
#define IUCV_IPBUFLST	0x40
#define IUCV_IPPRTY	0x20
#define IUCV_IPANSLST	0x08
#define IUCV_IPSYNC	0x04
#define IUCV_IPLOCAL	0x01

/*
 * iucv_array : Defines buffer array.
 * Inside the array may be 31- bit addresses and 31-bit lengths.
 * Use a pointer to an iucv_array as the buffer, reply or answer
 * parameter on iucv_message_send, iucv_message_send2way, iucv_message_receive
 * and iucv_message_reply if IUCV_IPBUFLST or IUCV_IPANSLST are used.
 */
struct iucv_array {
	u32 address;
	u32 length;
} __attribute__ ((aligned (8)));

extern struct bus_type iucv_bus;
extern struct device *iucv_root;

/*
 * struct iucv_path
 * pathid: 16 bit path identification
 * msglim: 16 bit message limit
 * flags: properties of the path: IPRMDATA, IPQUSCE, IPPRTY
 * handler:  address of iucv handler structure
 * private: private information of the handler associated with the path
 * list: list_head for the iucv_handler path list.
 */
struct iucv_path {
	u16 pathid;
	u16 msglim;
	u8  flags;
	void *private;
	struct iucv_handler *handler;
	struct list_head list;
};

/*
 * struct iucv_message
 * id: 32 bit message id
 * audit: 32 bit error information of purged or replied messages
 * class: 32 bit target class of a message (source class for replies)
 * tag: 32 bit tag to be associated with the message
 * length: 32 bit length of the message / reply
 * reply_size: 32 bit maximum allowed length of the reply
 * rmmsg: 8 byte inline message
 * flags: message properties (IUCV_IPPRTY)
 */
struct iucv_message {
	u32 id;
	u32 audit;
	u32 class;
	u32 tag;
	u32 length;
	u32 reply_size;
	u8  rmmsg[8];
	u8  flags;
};

/*
 * struct iucv_handler
 *
 * A vector of functions that handle IUCV interrupts. Each functions gets
 * a parameter area as defined by the CP Programming Services and private
 * pointer that is provided by the user of the interface.
 */
struct iucv_handler {
	 /*
	  * The path_pending function is called after an iucv interrupt
	  * type 0x01 has been received. The base code allocates a path
	  * structure and "asks" the handler if this path belongs to the
	  * handler. To accept the path the path_pending function needs
	  * to call iucv_path_accept and return 0. If the callback returns
	  * a value != 0 the iucv base code will continue with the next
	  * handler. The order in which the path_pending functions are
	  * called is the order of the registration of the iucv handlers
	  * to the base code.
	  */
	int  (*path_pending)(struct iucv_path *, u8 ipvmid[8], u8 ipuser[16]);
	/*
	 * The path_complete function is called after an iucv interrupt
	 * type 0x02 has been received for a path that has been established
	 * for this handler with iucv_path_connect and got accepted by the
	 * peer with iucv_path_accept.
	 */
	void (*path_complete)(struct iucv_path *, u8 ipuser[16]);
	 /*
	  * The path_severed function is called after an iucv interrupt
	  * type 0x03 has been received. The communication peer shutdown
	  * his end of the communication path. The path still exists and
	  * remaining messages can be received until a iucv_path_sever
	  * shuts down the other end of the path as well.
	  */
	void (*path_severed)(struct iucv_path *, u8 ipuser[16]);
	/*
	 * The path_quiesced function is called after an icuv interrupt
	 * type 0x04 has been received. The communication peer has quiesced
	 * the path. Delivery of messages is stopped until iucv_path_resume
	 * has been called.
	 */
	void (*path_quiesced)(struct iucv_path *, u8 ipuser[16]);
	/*
	 * The path_resumed function is called after an icuv interrupt
	 * type 0x05 has been received. The communication peer has resumed
	 * the path.
	 */
	void (*path_resumed)(struct iucv_path *, u8 ipuser[16]);
	/*
	 * The message_pending function is called after an icuv interrupt
	 * type 0x06 or type 0x07 has been received. A new message is
	 * availabe and can be received with iucv_message_receive.
	 */
	void (*message_pending)(struct iucv_path *, struct iucv_message *);
	/*
	 * The message_complete function is called after an icuv interrupt
	 * type 0x08 or type 0x09 has been received. A message send with
	 * iucv_message_send2way has been replied to. The reply can be
	 * received with iucv_message_receive.
	 */
	void (*message_complete)(struct iucv_path *, struct iucv_message *);

	struct list_head list;
	struct list_head paths;
};

/**
 * iucv_register:
 * @handler: address of iucv handler structure
 * @smp: != 0 indicates that the handler can deal with out of order messages
 *
 * Registers a driver with IUCV.
 *
 * Returns 0 on success, -ENOMEM if the memory allocation for the pathid
 * table failed, or -EIO if IUCV_DECLARE_BUFFER failed on all cpus.
 */
int iucv_register(struct iucv_handler *handler, int smp);

/**
 * iucv_unregister
 * @handler:  address of iucv handler structure
 * @smp: != 0 indicates that the handler can deal with out of order messages
 *
 * Unregister driver from IUCV.
 */
void iucv_unregister(struct iucv_handler *handle, int smp);

/**
 * iucv_path_alloc
 * @msglim: initial message limit
 * @flags: initial flags
 * @gfp: kmalloc allocation flag
 *
 * Allocate a new path structure for use with iucv_connect.
 *
 * Returns NULL if the memory allocation failed or a pointer to the
 * path structure.
 */
static inline struct iucv_path *iucv_path_alloc(u16 msglim, u8 flags, gfp_t gfp)
{
	struct iucv_path *path;

	path = kzalloc(sizeof(struct iucv_path), gfp);
	if (path) {
		path->msglim = msglim;
		path->flags = flags;
	}
	return path;
}

/**
 * iucv_path_free
 * @path: address of iucv path structure
 *
 * Frees a path structure.
 */
static inline void iucv_path_free(struct iucv_path *path)
{
	kfree(path);
}

/**
 * iucv_path_accept
 * @path: address of iucv path structure
 * @handler: address of iucv handler structure
 * @userdata: 16 bytes of data reflected to the communication partner
 * @private: private data passed to interrupt handlers for this path
 *
 * This function is issued after the user received a connection pending
 * external interrupt and now wishes to complete the IUCV communication path.
 *
 * Returns the result of the CP IUCV call.
 */
int iucv_path_accept(struct iucv_path *path, struct iucv_handler *handler,
		     u8 userdata[16], void *private);

/**
 * iucv_path_connect
 * @path: address of iucv path structure
 * @handler: address of iucv handler structure
 * @userid: 8-byte user identification
 * @system: 8-byte target system identification
 * @userdata: 16 bytes of data reflected to the communication partner
 * @private: private data passed to interrupt handlers for this path
 *
 * This function establishes an IUCV path. Although the connect may complete
 * successfully, you are not able to use the path until you receive an IUCV
 * Connection Complete external interrupt.
 *
 * Returns the result of the CP IUCV call.
 */
int iucv_path_connect(struct iucv_path *path, struct iucv_handler *handler,
		      u8 userid[8], u8 system[8], u8 userdata[16],
		      void *private);

/**
 * iucv_path_quiesce:
 * @path: address of iucv path structure
 * @userdata: 16 bytes of data reflected to the communication partner
 *
 * This function temporarily suspends incoming messages on an IUCV path.
 * You can later reactivate the path by invoking the iucv_resume function.
 *
 * Returns the result from the CP IUCV call.
 */
int iucv_path_quiesce(struct iucv_path *path, u8 userdata[16]);

/**
 * iucv_path_resume:
 * @path: address of iucv path structure
 * @userdata: 16 bytes of data reflected to the communication partner
 *
 * This function resumes incoming messages on an IUCV path that has
 * been stopped with iucv_path_quiesce.
 *
 * Returns the result from the CP IUCV call.
 */
int iucv_path_resume(struct iucv_path *path, u8 userdata[16]);

/**
 * iucv_path_sever
 * @path: address of iucv path structure
 * @userdata: 16 bytes of data reflected to the communication partner
 *
 * This function terminates an IUCV path.
 *
 * Returns the result from the CP IUCV call.
 */
int iucv_path_sever(struct iucv_path *path, u8 userdata[16]);

/**
 * iucv_message_purge
 * @path: address of iucv path structure
 * @msg: address of iucv msg structure
 * @srccls: source class of message
 *
 * Cancels a message you have sent.
 *
 * Returns the result from the CP IUCV call.
 */
int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
		       u32 srccls);

/**
 * iucv_message_receive
 * @path: address of iucv path structure
 * @msg: address of iucv msg structure
 * @flags: flags that affect how the message is received (IUCV_IPBUFLST)
 * @buffer: address of data buffer or address of struct iucv_array
 * @size: length of data buffer
 * @residual:
 *
 * This function receives messages that are being sent to you over
 * established paths. This function will deal with RMDATA messages
 * embedded in struct iucv_message as well.
 *
 * Locking:	local_bh_enable/local_bh_disable
 *
 * Returns the result from the CP IUCV call.
 */
int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
			 u8 flags, void *buffer, size_t size, size_t *residual);

/**
 * __iucv_message_receive
 * @path: address of iucv path structure
 * @msg: address of iucv msg structure
 * @flags: flags that affect how the message is received (IUCV_IPBUFLST)
 * @buffer: address of data buffer or address of struct iucv_array
 * @size: length of data buffer
 * @residual:
 *
 * This function receives messages that are being sent to you over
 * established paths. This function will deal with RMDATA messages
 * embedded in struct iucv_message as well.
 *
 * Locking:	no locking.
 *
 * Returns the result from the CP IUCV call.
 */
int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
			   u8 flags, void *buffer, size_t size,
			   size_t *residual);

/**
 * iucv_message_reject
 * @path: address of iucv path structure
 * @msg: address of iucv msg structure
 *
 * The reject function refuses a specified message. Between the time you
 * are notified of a message and the time that you complete the message,
 * the message may be rejected.
 *
 * Returns the result from the CP IUCV call.
 */
int iucv_message_reject(struct iucv_path *path, struct iucv_message *msg);

/**
 * iucv_message_reply
 * @path: address of iucv path structure
 * @msg: address of iucv msg structure
 * @flags: how the reply is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
 * @reply: address of data buffer or address of struct iucv_array
 * @size: length of reply data buffer
 *
 * This function responds to the two-way messages that you receive. You
 * must identify completely the message to which you wish to reply. ie,
 * pathid, msgid, and trgcls. Prmmsg signifies the data is moved into
 * the parameter list.
 *
 * Returns the result from the CP IUCV call.
 */
int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
		       u8 flags, void *reply, size_t size);

/**
 * iucv_message_send
 * @path: address of iucv path structure
 * @msg: address of iucv msg structure
 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
 * @srccls: source class of message
 * @buffer: address of data buffer or address of struct iucv_array
 * @size: length of send buffer
 *
 * This function transmits data to another application. Data to be
 * transmitted is in a buffer and this is a one-way message and the
 * receiver will not reply to the message.
 *
 * Locking:	local_bh_enable/local_bh_disable
 *
 * Returns the result from the CP IUCV call.
 */
int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
		      u8 flags, u32 srccls, void *buffer, size_t size);

/**
 * __iucv_message_send
 * @path: address of iucv path structure
 * @msg: address of iucv msg structure
 * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
 * @srccls: source class of message
 * @buffer: address of data buffer or address of struct iucv_array
 * @size: length of send buffer
 *
 * This function transmits data to another application. Data to be
 * transmitted is in a buffer and this is a one-way message and the
 * receiver will not reply to the message.
 *
 * Locking:	no locking.
 *
 * Returns the result from the CP IUCV call.
 */
int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
			u8 flags, u32 srccls, void *buffer, size_t size);

/**
 * iucv_message_send2way
 * @path: address of iucv path structure
 * @msg: address of iucv msg structure
 * @flags: how the message is sent and the reply is received
 *	   (IUCV_IPRMDATA, IUCV_IPBUFLST, IUCV_IPPRTY, IUCV_ANSLST)
 * @srccls: source class of message
 * @buffer: address of data buffer or address of struct iucv_array
 * @size: length of send buffer
 * @ansbuf: address of answer buffer or address of struct iucv_array
 * @asize: size of reply buffer
 *
 * This function transmits data to another application. Data to be
 * transmitted is in a buffer. The receiver of the send is expected to
 * reply to the message and a buffer is provided into which IUCV moves
 * the reply to this message.
 *
 * Returns the result from the CP IUCV call.
 */
int iucv_message_send2way(struct iucv_path *path, struct iucv_message *msg,
			  u8 flags, u32 srccls, void *buffer, size_t size,
			  void *answer, size_t asize, size_t *residual);