aboutsummaryrefslogtreecommitdiffstats
path: root/src/tbf.h
blob: 1a23e43860ae2d2cf93b158214d89b2f30af91a7 (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
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
/*
 * Copyright (C) 2013 by Holger Hans Peter Freyther
 *
 * 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.
 */

#pragma once

#ifdef __cplusplus

#include "gprs_rlcmac.h"
#include "llc.h"
#include "rlc.h"
#include "cxx_linuxlist.h"
#include <gprs_debug.h>

#include <stdint.h>

struct bssgp_bvc_ctx;
struct rlc_ul_header;
struct msgb;
struct pcu_l1_meas;
class GprsMs;

/*
 * TBF instance
 */

#define Tassign_agch 0,200000	/* waiting after IMM.ASS confirm */
#define Tassign_pacch 2,0	/* timeout for pacch assigment */

enum gprs_rlcmac_tbf_state {
	GPRS_RLCMAC_NULL = 0,	/* new created TBF */
	GPRS_RLCMAC_ASSIGN,     /* wait for DL transmission */
	GPRS_RLCMAC_WAIT_ASSIGN,/* wait for confirmation */
	GPRS_RLCMAC_FLOW,	/* RLC/MAC flow, resource needed */
	GPRS_RLCMAC_FINISHED,	/* flow finished, wait for release */
	GPRS_RLCMAC_WAIT_RELEASE,/* wait for release or restart of DL TBF */
	GPRS_RLCMAC_RELEASING,	/* releasing, wait to free TBI/USF */
	GPRS_RLCMAC_RECONFIGURING, // TS RECON. scheduled
};

enum gprs_rlcmac_tbf_poll_state {
	GPRS_RLCMAC_POLL_NONE = 0,
	GPRS_RLCMAC_POLL_SCHED, /* a polling was scheduled */
};

enum gprs_rlcmac_tbf_dl_ts_recon_state {
	GPRS_RLCMAC_DL_TS_RECON_NONE = 0,
	GPRS_RLCMAC_DL_TS_RECON_SEND, /* send PTSR on next RTS */
	GPRS_RLCMAC_DL_TS_RECON_WAIT_ACK, /* wait for PACKET CONTROL ACK */
};

enum gprs_rlcmac_tbf_dl_ass_state {
	GPRS_RLCMAC_DL_ASS_NONE = 0,
	GPRS_RLCMAC_DL_ASS_SEND_ASS, /* send downlink assignment on next RTS */
	GPRS_RLCMAC_DL_ASS_WAIT_ACK, /* wait for PACKET CONTROL ACK */
};

enum gprs_rlcmac_tbf_ul_ass_state {
	GPRS_RLCMAC_UL_ASS_NONE = 0,
	GPRS_RLCMAC_UL_ASS_SEND_ASS, /* send uplink assignment on next RTS */
	GPRS_RLCMAC_UL_ASS_WAIT_ACK, /* wait for PACKET CONTROL ACK */
};

enum gprs_rlcmac_tbf_ul_ack_state {
	GPRS_RLCMAC_UL_ACK_NONE = 0,
	GPRS_RLCMAC_UL_ACK_SEND_ACK, /* send acknowledge on next RTS */
	GPRS_RLCMAC_UL_ACK_WAIT_ACK, /* wait for PACKET CONTROL ACK */
};

enum gprs_rlcmac_tbf_direction {
	GPRS_RLCMAC_DL_TBF,
	GPRS_RLCMAC_UL_TBF
};

#define GPRS_RLCMAC_FLAG_CCCH		0 /* assignment on CCCH */
#define GPRS_RLCMAC_FLAG_PACCH		1 /* assignment on PACCH */
#define GPRS_RLCMAC_FLAG_UL_DATA	2 /* uplink data received */
#define GPRS_RLCMAC_FLAG_DL_ACK		3 /* downlink acknowledge received  */
#define GPRS_RLCMAC_FLAG_TO_UL_ACK	4
#define GPRS_RLCMAC_FLAG_TO_DL_ACK	5
#define GPRS_RLCMAC_FLAG_TO_UL_ASS	6
#define GPRS_RLCMAC_FLAG_TO_DL_ASS	7
#define GPRS_RLCMAC_FLAG_TO_MASK	0xf0 /* timeout bits */

struct gprs_rlcmac_tbf {
	gprs_rlcmac_tbf(BTS *bts_, gprs_rlcmac_tbf_direction dir);

	static void free_all(struct gprs_rlcmac_trx *trx);
	static void free_all(struct gprs_rlcmac_pdch *pdch);

	bool state_is(enum gprs_rlcmac_tbf_state rhs) const;
	bool state_is_not(enum gprs_rlcmac_tbf_state rhs) const;
	void set_state(enum gprs_rlcmac_tbf_state new_state);
	const char *state_name() const;

	const char *name() const;

	struct msgb *create_dl_ass(uint32_t fn, uint8_t ts);
	struct msgb *create_ul_ass(uint32_t fn, uint8_t ts);

	GprsMs *ms() const;
	void set_ms(GprsMs *ms);

	gprs_rlc_window *window();

	uint8_t tsc() const;

	int rlcmac_diag();

	int update();
	void handle_timeout();
	void stop_timer();
	void stop_t3191();
	int establish_dl_tbf_on_pacch();

	int check_polling(uint32_t fn, uint8_t ts,
		uint32_t *poll_fn, unsigned int *rrbp);
	void set_polling(uint32_t poll_fn, uint8_t ts);
	void poll_timeout();

	/** tlli handling */
	uint32_t tlli() const;
	bool is_tlli_valid() const;

	/** MS updating */
	void update_ms(uint32_t tlli, enum gprs_rlcmac_tbf_direction);

	uint8_t tfi() const;
	bool is_tfi_assigned() const;

	const char *imsi() const;
	void assign_imsi(const char *imsi);
	uint8_t ta() const;
	void set_ta(uint8_t);
	uint8_t ms_class() const;
	void set_ms_class(uint8_t);
	GprsCodingScheme current_cs() const;
	gprs_llc_queue *llc_queue();
	const gprs_llc_queue *llc_queue() const;

	time_t created_ts() const;
	uint8_t dl_slots() const;
	uint8_t ul_slots() const;

	bool is_control_ts(uint8_t ts) const;

	/* EGPRS */
	bool is_egprs_enabled() const;
	void enable_egprs();
	void disable_egprs();

	/* attempt to make things a bit more fair */
	void rotate_in_list();

	LListHead<gprs_rlcmac_tbf>& ms_list() {return this->m_ms_list;}
	const LListHead<gprs_rlcmac_tbf>& ms_list() const {return this->m_ms_list;}

	LListHead<gprs_rlcmac_tbf>& list();
	const LListHead<gprs_rlcmac_tbf>& list() const;

	uint32_t state_flags;
	enum gprs_rlcmac_tbf_direction direction;
	struct gprs_rlcmac_trx *trx;
	uint8_t first_ts; /* first TS used by TBF */
	uint8_t first_common_ts; /* first TS that the phone can send and
		reveive simultaniously */
	uint8_t control_ts; /* timeslot control messages and polling */
	struct gprs_rlcmac_pdch *pdch[8]; /* list of PDCHs allocated to TBF */

	gprs_llc m_llc;

	enum gprs_rlcmac_tbf_dl_ass_state dl_ass_state;
	enum gprs_rlcmac_tbf_ul_ass_state ul_ass_state;
	enum gprs_rlcmac_tbf_ul_ack_state ul_ack_state;

	enum gprs_rlcmac_tbf_poll_state poll_state;
	uint32_t poll_fn; /* frame number to poll */
	uint8_t poll_ts; /* TS to poll */

	gprs_rlc m_rlc;
	
	uint8_t n3105;	/* N3105 counter */

	struct osmo_timer_list	timer;
	unsigned int T; /* Txxxx number */
	unsigned int num_T_exp; /* number of consecutive T expirations */
	
	struct osmo_gsm_timer_list	gsm_timer;
	unsigned int fT; /* fTxxxx number */
	unsigned int num_fT_exp; /* number of consecutive fT expirations */

	struct Meas {
		struct timeval rssi_tv; /* timestamp for rssi calculation */
		int32_t rssi_sum; /* sum of rssi values */
		int rssi_num; /* number of rssi values added since rssi_tv */

		Meas();
	} meas;

	/* these should become protected but only after gprs_rlcmac_data.c
	 * stops to iterate over all tbf in its current form */
	enum gprs_rlcmac_tbf_state state;

	/* Remember if the tbf was in wait_release state when we want to
	 * schedule a new dl assignment */
	uint8_t was_releasing;

	/* Can/should we upgrade this tbf to use multiple slots? */
	uint8_t upgrade_to_multislot;

	/* store the BTS this TBF belongs to */
	BTS *bts;

	/*
	 * private fields. We can't make it private as it is breaking the
	 * llist macros.
	 */
	uint8_t m_tfi;
	time_t m_created_ts;

protected:
	gprs_rlcmac_bts *bts_data() const;

	int set_tlli_from_ul(uint32_t new_tlli);
	void merge_and_clear_ms(GprsMs *old_ms);

    static const char *tbf_state_name[8];

	class GprsMs *m_ms;

	/* Fields to take the TA/MS class values if no MS is associated */
	uint8_t m_ta;
	uint8_t m_ms_class;

private:
	LListHead<gprs_rlcmac_tbf> m_list;
	LListHead<gprs_rlcmac_tbf> m_ms_list;
	bool m_egprs_enabled;

	mutable char m_name_buf[60];
};


struct gprs_rlcmac_ul_tbf *tbf_alloc_ul(struct gprs_rlcmac_bts *bts,
	int8_t use_trx, uint8_t ms_class, uint8_t egprs_ms_class,
	uint32_t tlli, uint8_t ta, GprsMs *ms);

struct gprs_rlcmac_ul_tbf *tbf_alloc_ul_tbf(struct gprs_rlcmac_bts *bts,
	GprsMs *ms, int8_t use_trx,
	uint8_t ms_class, uint8_t egprs_ms_class, uint8_t single_slot);

struct gprs_rlcmac_dl_tbf *tbf_alloc_dl_tbf(struct gprs_rlcmac_bts *bts,
	GprsMs *ms, int8_t use_trx,
	uint8_t ms_class, uint8_t egprs_ms_class, uint8_t single_slot);

void tbf_free(struct gprs_rlcmac_tbf *tbf);

int tbf_assign_control_ts(struct gprs_rlcmac_tbf *tbf);

void tbf_timer_start(struct gprs_rlcmac_tbf *tbf, unsigned int T,
                        unsigned int seconds, unsigned int microseconds);

inline bool gprs_rlcmac_tbf::state_is(enum gprs_rlcmac_tbf_state rhs) const
{
	return state == rhs;
}

inline bool gprs_rlcmac_tbf::state_is_not(enum gprs_rlcmac_tbf_state rhs) const
{
	return state != rhs;
}

const char *tbf_name(gprs_rlcmac_tbf *tbf);

inline const char *gprs_rlcmac_tbf::state_name() const
{
	return tbf_state_name[state];
}

inline void gprs_rlcmac_tbf::set_state(enum gprs_rlcmac_tbf_state new_state)
{
	LOGP(DRLCMAC, LOGL_DEBUG, "%s changes state from %s to %s\n",
		tbf_name(this),
		tbf_state_name[state], tbf_state_name[new_state]);
	state = new_state;
}

inline LListHead<gprs_rlcmac_tbf>& gprs_rlcmac_tbf::list()
{
	return this->m_list;
}

inline const LListHead<gprs_rlcmac_tbf>& gprs_rlcmac_tbf::list() const
{
	return this->m_list;
}

inline GprsMs *gprs_rlcmac_tbf::ms() const
{
	return m_ms;
}

inline bool gprs_rlcmac_tbf::is_tlli_valid() const
{
	return tlli() != 0;
}

inline bool gprs_rlcmac_tbf::is_tfi_assigned() const
{
	/* The TBF is established or has been assigned by a IMM.ASS for
	 * download */
	return state > GPRS_RLCMAC_ASSIGN;
}

inline uint8_t gprs_rlcmac_tbf::tfi() const
{
	return m_tfi;
}

inline time_t gprs_rlcmac_tbf::created_ts() const
{
	return m_created_ts;
}

inline bool gprs_rlcmac_tbf::is_egprs_enabled() const
{
	return m_egprs_enabled;
}

inline void gprs_rlcmac_tbf::enable_egprs()
{
	m_egprs_enabled = true;
}

inline void gprs_rlcmac_tbf::disable_egprs()
{
	m_egprs_enabled = false;
}

struct gprs_rlcmac_dl_tbf : public gprs_rlcmac_tbf {
	gprs_rlcmac_dl_tbf(BTS *bts);

	void cleanup();

	/* dispatch Unitdata.DL messages */
	static int handle(struct gprs_rlcmac_bts *bts,
		const uint32_t tlli, const uint32_t old_tlli,
		const char *imsi, const uint8_t ms_class,
		const uint8_t egprs_ms_class, const uint16_t delay_csec,
		const uint8_t *data, const uint16_t len);

	int append_data(const uint8_t ms_class,
			const uint16_t pdu_delay_csec,
			const uint8_t *data, const uint16_t len);

	int rcvd_dl_ack(uint8_t final, uint8_t ssn, uint8_t *rbb);
	int rcvd_dl_ack(uint8_t final_ack, unsigned first_bsn, struct bitvec *rbb);
	struct msgb *create_dl_acked_block(uint32_t fn, uint8_t ts);
	void request_dl_ack();
	bool need_control_ts() const;
	bool have_data() const;
	int frames_since_last_poll(unsigned fn) const;
	int frames_since_last_drain(unsigned fn) const;
	bool keep_open(unsigned fn) const;
	int release();
	int abort();

    bool needs_recon_to_be_scheduled() const;
    void reconfigure_for_multislot();
    msgb *create_recon(uint32_t fn, uint8_t ts);

	/* TODO: add the gettimeofday as parameter */
	struct msgb *llc_dequeue(bssgp_bvc_ctx *bctx);

	/* Please note that all variables here will be reset when changing
	 * from WAIT RELEASE back to FLOW state (re-use of TBF).
	 * All states that need reset must be in this struct, so this is why
	 * variables are in both (dl and ul) structs and not outside union.
	 */
	gprs_rlc_dl_window m_window;
	int32_t m_tx_counter; /* count all transmitted blocks */
	uint8_t m_wait_confirm; /* wait for CCCH IMM.ASS cnf */
	bool m_dl_ack_requested;
	int32_t m_last_dl_poll_fn;
	int32_t m_last_dl_drained_fn;

	struct BandWidth {
		struct timeval dl_bw_tv; /* timestamp for dl bw calculation */
		uint32_t dl_bw_octets; /* number of octets since bw_tv */

		struct timeval dl_loss_tv; /* timestamp for loss calculation */
		uint16_t dl_loss_lost; /* sum of lost packets */
		uint16_t dl_loss_received; /* sum of received packets */

		BandWidth();
	} m_bw;

protected:
    enum gprs_rlcmac_tbf_dl_ts_recon_state m_recon_state;

	struct ana_result {
		unsigned received_packets;
		unsigned lost_packets;
		unsigned received_bytes;
		unsigned lost_bytes;
	};

	int take_next_bsn(uint32_t fn, int previous_bsn,
		bool *may_combine);
	bool restart_bsn_cycle();
	int create_new_bsn(const uint32_t fn, GprsCodingScheme cs);
	struct msgb *create_dl_acked_block(const uint32_t fn, const uint8_t ts,
					int index, int index2 = -1);
	int update_window(const uint8_t ssn, const uint8_t *rbb);
	int update_window(unsigned first_bsn, const struct bitvec *rbb);
	int maybe_start_new_window();
	bool dl_window_stalled() const;
	void reuse_tbf();
	void start_llc_timer();
	int analyse_errors(char *show_rbb, uint8_t ssn, ana_result *res);
	void schedule_next_frame();

	struct osmo_timer_list m_llc_timer;
};

struct gprs_rlcmac_ul_tbf : public gprs_rlcmac_tbf {
	gprs_rlcmac_ul_tbf(BTS *bts);

	struct msgb *create_ul_ack(uint32_t fn, uint8_t ts);

	/* blocks were acked */
	int rcv_data_block_acknowledged(
		const struct gprs_rlc_data_info *rlc,
		uint8_t *data, struct pcu_l1_meas *meas);


	/* TODO: extract LLC class? */
	int assemble_forward_llc(const gprs_rlc_data *data);
	int snd_ul_ud();

	/* Please note that all variables here will be reset when changing
	 * from WAIT RELEASE back to FLOW state (re-use of TBF).
	 * All states that need reset must be in this struct, so this is why
	 * variables are in both (dl and ul) structs and not outside union.
	 */
	gprs_rlc_ul_window m_window;
	int32_t m_rx_counter; /* count all received blocks */
	uint8_t m_n3103;	/* N3103 counter */
	uint8_t m_usf[8];	/* list USFs per PDCH (timeslot) */
	uint8_t m_contention_resolution_done; /* set after done */
	uint8_t m_final_ack_sent; /* set if we sent final ack */

protected:
	void maybe_schedule_uplink_acknack(const gprs_rlc_data_info *rlc);
};

inline enum gprs_rlcmac_tbf_direction reverse(enum gprs_rlcmac_tbf_direction dir)
{
	return (enum gprs_rlcmac_tbf_direction)
		((int)GPRS_RLCMAC_UL_TBF - (int)dir + (int)GPRS_RLCMAC_DL_TBF);
}

inline gprs_rlcmac_ul_tbf *as_ul_tbf(gprs_rlcmac_tbf *tbf)
{
	if (tbf && tbf->direction == GPRS_RLCMAC_UL_TBF)
		return static_cast<gprs_rlcmac_ul_tbf *>(tbf);
	else
		return NULL;
}

inline gprs_rlcmac_dl_tbf *as_dl_tbf(gprs_rlcmac_tbf *tbf)
{
	if (tbf && tbf->direction == GPRS_RLCMAC_DL_TBF)
		return static_cast<gprs_rlcmac_dl_tbf *>(tbf);
	else
		return NULL;
}

inline gprs_rlc_window *gprs_rlcmac_tbf::window()
{
	switch (direction)
	{
	case GPRS_RLCMAC_UL_TBF: return &as_ul_tbf(this)->m_window;
	case GPRS_RLCMAC_DL_TBF: return &as_dl_tbf(this)->m_window;
	}
	return NULL;
}

inline bool gprs_rlcmac_dl_tbf::needs_recon_to_be_scheduled() const
{
    return m_recon_state == GPRS_RLCMAC_DL_TS_RECON_SEND;
}

#endif