aboutsummaryrefslogtreecommitdiffstats
path: root/src/tbf.h
blob: 0f8e77d1cda927feebf39414bdd0a199f8e509a3 (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
/*
 * 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

#include "gprs_rlcmac.h"

#include <stdint.h>

struct bssgp_bvc_ctx;

/*
 * TBF instance
 */

#define LLC_MAX_LEN 1543
#define RLC_MAX_SNS 128 /* GPRS, must be power of 2 */
#define RLC_MAX_WS  64 /* max window size */
#define RLC_MAX_LEN 54 /* CS-4 including spare bits */

#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 downlink assignment */
	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 */
};

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

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 {

	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);

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

	/* TODO: extract LLC class? */
	int assemble_forward_llc(uint8_t *data, uint8_t len);

	int rlcmac_diag();

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

	struct llist_head list;
	uint32_t state_flags;
	enum gprs_rlcmac_tbf_direction direction;
	uint8_t tfi;
	uint32_t tlli;
	uint8_t tlli_valid;
	struct gprs_rlcmac_trx *trx;
	uint8_t trx_no;
	uint16_t arfcn;
	uint8_t tsc;
	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 */
	uint8_t ms_class;
	struct gprs_rlcmac_pdch *pdch[8]; /* list of PDCHs allocated to TBF */
	uint16_t ta;
	uint8_t llc_frame[LLC_MAX_LEN]; /* current DL or UL frame */
	uint16_t llc_index; /* current write/read position of frame */
	uint16_t llc_length; /* len of current DL LLC_frame, 0 == no frame */
	struct llist_head llc_queue; /* queued LLC DL data */

	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 */

	uint16_t ws;	/* window size */
	uint16_t sns;	/* sequence number space */

	/* 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.
	 */
	union {
		struct {
			uint16_t bsn;	/* block sequence number */
			uint16_t v_s;	/* send state */
			uint16_t v_a;	/* ack state */
			char v_b[RLC_MAX_SNS/2]; /* acknowledge state array */
			int32_t tx_counter; /* count all transmitted blocks */
			char imsi[16]; /* store IMSI for PCH retransmission */
			uint8_t wait_confirm; /* wait for CCCH IMM.ASS cnf */
		} dl;
		struct {
			uint16_t bsn;	/* block sequence number */
			uint16_t v_r;	/* receive state */
			uint16_t v_q;	/* receive window state */
			char v_n[RLC_MAX_SNS/2]; /* receive state array */
			int32_t rx_counter; /* count all received blocks */
			uint8_t n3103;	/* N3103 counter */
			uint8_t usf[8];	/* list USFs per PDCH (timeslot) */
			uint8_t contention_resolution_done; /* set after done */
			uint8_t final_ack_sent; /* set if we sent final ack */
		} ul;
	} dir;
	uint8_t rlc_block[RLC_MAX_SNS/2][RLC_MAX_LEN]; /* block history */
	uint8_t rlc_block_len[RLC_MAX_SNS/2]; /* block len  of history */
	
	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 {
		char imsi[16];

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

		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 */

		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 */

	} meas;

	uint8_t cs; /* current coding scheme */

#ifdef DEBUG_DIAGRAM
	int diag; /* number where TBF is presented in diagram */
	int diag_new; /* used to format output of new TBF */
#endif

	/* 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;

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


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

struct gprs_rlcmac_tbf *tbf_alloc_ul(struct gprs_rlcmac_bts *bts,
	int8_t use_trx, uint8_t ms_class,
	uint32_t tlli, uint8_t ta, struct gprs_rlcmac_tbf *dl_tbf);

struct gprs_rlcmac_tbf *tbf_alloc(struct gprs_rlcmac_bts *bts,
	struct gprs_rlcmac_tbf *old_tbf,
	enum gprs_rlcmac_tbf_direction dir, uint8_t tfi, uint8_t trx,
	uint8_t 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_new_state(struct gprs_rlcmac_tbf *tbf,
        enum gprs_rlcmac_tbf_state state);

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;
}

inline void gprs_rlcmac_tbf::set_state(enum gprs_rlcmac_tbf_state new_state)
{
	state = new_state;
}