aboutsummaryrefslogtreecommitdiffstats
path: root/src/bts.cpp
blob: 73ec1f778599954a8dbceb1bb32bf5ce9e23c3d9 (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
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
/*
 * Copyright (C) 2013 by Holger Hans Peter Freyther
 *
 * All Rights Reserved
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation; either version 3 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 Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include <bts.h>
#include <poll_controller.h>
#include <tbf.h>
#include <encoding.h>
#include <decoding.h>
#include <rlc.h>
#include <pcu_l1_if.h>

#include <gprs_rlcmac.h>
#include <gprs_debug.h>

extern "C" {
	#include <osmocom/core/talloc.h>
	#include <osmocom/core/msgb.h>
	#include <osmocom/core/stats.h>
	#include <osmocom/gsm/protocol/gsm_04_08.h>
}

#include <arpa/inet.h>

#include <errno.h>
#include <string.h>

extern void *tall_pcu_ctx;

static BTS s_bts;

/**
 * For gcc-4.4 compat do not use extended initializer list but keep the
 * order from the enum here. Once we support GCC4.7 and up we can change
 * the code below.
 */
static const struct rate_ctr_desc bts_ctr_description[] = {
	{ "tbf.dl.alloc",		"TBF DL Allocated     "},
	{ "tbf.dl.freed",		"TBF DL Freed         "},
	{ "tbf.dl.aborted",		"TBF DL Aborted       "},
	{ "tbf.ul.alloc",		"TBF UL Allocated     "},
	{ "tbf.ul.freed",		"TBF UL Freed         "},
	{ "tbf.ul.aborted",		"TBF UL Aborted       "},
	{ "tbf.reused",			"TBF Reused           "},
	{ "tbf.alloc.algo-a",		"TBF Alloc Algo A     "},
	{ "tbf.alloc.algo-b",		"TBF Alloc Algo B     "},
	{ "tbf.failed.egprs-only",	"TBF Failed EGPRS-only"},
	{ "rlc.sent",			"RLC Sent             "},
	{ "rlc.resent",			"RLC Resent           "},
	{ "rlc.restarted",		"RLC Restarted        "},
	{ "rlc.stalled",		"RLC Stalled          "},
	{ "rlc.nacked",			"RLC Nacked           "},
	{ "rlc.ass.timedout",		"RLC Assign Timeout   "},
	{ "rlc.ass.failed",		"RLC Assign Failed    "},
	{ "rlc.ack.timedout",		"RLC Ack Timeout      "},
	{ "rlc.ack.failed",		"RLC Ack Failed       "},
	{ "rlc.rel.timedout",		"RLC Release Timeout  "},
	{ "rlc.late-block",		"RLC Late Block       "},
	{ "rlc.sent-dummy",		"RLC Sent Dummy       "},
	{ "rlc.sent-control",		"RLC Sent Control     "},
	{ "rlc.dl_bytes",		"RLC DL Bytes         "},
	{ "rlc.dl_payload_bytes",	"RLC DL Payload Bytes "},
	{ "rlc.ul_bytes",		"RLC UL Bytes         "},
	{ "rlc.ul_payload_bytes",	"RLC UL Payload Bytes "},
	{ "decode.errors",		"Decode Errors        "},
	{ "sba.allocated",		"SBA Allocated        "},
	{ "sba.freed",			"SBA Freed            "},
	{ "sba.timedout",		"SBA Timeout          "},
	{ "llc.timeout",		"Timedout Frames      "},
	{ "llc.dropped",		"Dropped Frames       "},
	{ "llc.scheduled",		"Scheduled Frames     "},
	{ "llc.dl_bytes",               "RLC encapsulated PDUs"},
	{ "llc.ul_bytes",               "full PDUs received   "},
	{ "rach.requests",		"RACH requests        "},
};

static const struct rate_ctr_group_desc bts_ctrg_desc = {
	"bts",
	"BTS Statistics",
	OSMO_STATS_CLASS_GLOBAL,
	ARRAY_SIZE(bts_ctr_description),
	bts_ctr_description,
};

static const struct osmo_stat_item_desc bts_stat_item_description[] = {
	{ "ms.present",		"MS Present           ",
		OSMO_STAT_ITEM_NO_UNIT, 4, 0},
};

static const struct osmo_stat_item_group_desc bts_statg_desc = {
	"bts",
	"BTS Statistics",
	OSMO_STATS_CLASS_GLOBAL,
	ARRAY_SIZE(bts_stat_item_description),
	bts_stat_item_description,
};

BTS* BTS::main_bts()
{
	return &s_bts;
}

struct gprs_rlcmac_bts *BTS::bts_data()
{
	return &m_bts;
}

struct gprs_rlcmac_bts *bts_main_data()
{
	return BTS::main_bts()->bts_data();
}

struct rate_ctr_group *bts_main_data_stats()
{
	return BTS::main_bts()->rate_counters();
}

BTS::BTS()
	: m_cur_fn(0)
	, m_cur_blk_fn(-1)
	, m_pollController(*this)
	, m_sba(*this)
	, m_ms_store(this)
{
	memset(&m_bts, 0, sizeof(m_bts));
	m_bts.bts = this;

	/* initialize back pointers */
	for (size_t trx_no = 0; trx_no < ARRAY_SIZE(m_bts.trx); ++trx_no) {
		struct gprs_rlcmac_trx *trx = &m_bts.trx[trx_no];
		trx->trx_no = trx_no;
		trx->bts = this;

		for (size_t ts_no = 0; ts_no < ARRAY_SIZE(trx->pdch); ++ts_no) {
			struct gprs_rlcmac_pdch *pdch = &trx->pdch[ts_no];
			pdch->ts_no = ts_no;
			pdch->trx = trx;
		}
	}

	m_ratectrs = rate_ctr_group_alloc(tall_pcu_ctx, &bts_ctrg_desc, 0);
	m_statg = osmo_stat_item_group_alloc(tall_pcu_ctx, &bts_statg_desc, 0);
}

BTS::~BTS()
{
	/* this can cause counter updates and must not be left to the
	 * m_ms_store's destructor */
	m_ms_store.cleanup();

	rate_ctr_group_free(m_ratectrs);
	osmo_stat_item_group_free(m_statg);
}


void BTS::set_current_frame_number(int fn)
{
	/* The UL frame numbers lag 3 behind the DL frames and the data
	 * indication is only sent after all 4 frames of the block have been
	 * received. Sometimes there is an idle frame between the end of one
	 * and start of another frame (every 3 blocks).  So the timeout should
	 * definitely be there if we're more than 8 frames past poll_fn. Let's
	 * stay on the safe side and say 13 or more. An additional delay can
	 * happen due to the block processing time in the DSP, so the delay of
	 * decoded blocks relative to the timing clock can be much larger.
	 * Values up to 50 frames have been observed under load. */
	const static int max_delay = 60;

	m_cur_fn = fn;
	m_pollController.expireTimedout(m_cur_fn, max_delay);
}

void BTS::set_current_block_frame_number(int fn, unsigned max_delay)
{
	int delay = 0;
	const int late_block_delay_thresh = 13;
	const int fn_update_ok_min_delay = -500;
	const int fn_update_ok_max_delay = 0;

	/* frame numbers in the received blocks are assumed to be strongly
	 * monotonic. */
	if (m_cur_blk_fn >= 0) {
		int delta = (fn + 2715648 * 3 / 2 - m_cur_blk_fn) % 2715648 - 2715648/2;
		if (delta <= 0)
			return;
	}

	/* Check block delay vs. the current frame number */
	if (current_frame_number() != 0)
		delay = (fn + 2715648 * 3 / 2 - current_frame_number()) % 2715648
			- 2715648/2;
	if (delay <= -late_block_delay_thresh) {
		LOGP(DRLCMAC, LOGL_NOTICE,
			"Late RLC block, FN delta: %d FN: %d curFN: %d\n",
			delay, fn, current_frame_number());
		rlc_late_block();
	}

	m_cur_blk_fn = fn;
	if (delay < fn_update_ok_min_delay || delay > fn_update_ok_max_delay ||
		current_frame_number() == 0)
		m_cur_fn = fn;

	m_pollController.expireTimedout(fn, max_delay);
}

int BTS::add_paging(uint8_t chan_needed, uint8_t *identity_lv)
{
	uint8_t l, trx, ts, any_tbf = 0;
	struct gprs_rlcmac_tbf *tbf;
	LListHead<gprs_rlcmac_tbf> *pos;
	struct gprs_rlcmac_paging *pag;
	uint8_t slot_mask[8];
	int8_t first_ts; /* must be signed */

	LListHead<gprs_rlcmac_tbf> *tbfs_lists[] = {
		&m_ul_tbfs,
		&m_dl_tbfs,
		NULL
	};


	LOGP(DRLCMAC, LOGL_INFO, "Add RR paging: chan-needed=%d MI=%s\n",
		chan_needed, osmo_hexdump(identity_lv + 1, identity_lv[0]));

	/* collect slots to page
	 * Mark slots for every TBF, but only mark one of it.
	 * Mark only the first slot found.
	 * Don't mark, if TBF uses a different slot that is already marked. */
	memset(slot_mask, 0, sizeof(slot_mask));
	for (l = 0; tbfs_lists[l]; l++) {
		llist_for_each(pos, tbfs_lists[l]) {
			tbf = pos->entry();
			first_ts = -1;
			for (ts = 0; ts < 8; ts++) {
				if (tbf->pdch[ts]) {
					/* remember the first slot found */
					if (first_ts < 0)
						first_ts = ts;
					/* break, if we already marked a slot */
					if ((slot_mask[tbf->trx->trx_no] & (1 << ts)))
						break;
				}
			}
			/* mark first slot found, if none is marked already */
			if (ts == 8 && first_ts >= 0) {
				LOGP(DRLCMAC, LOGL_DEBUG, "- %s uses "
					"TRX=%d TS=%d, so we mark\n",
					tbf_name(tbf),
					tbf->trx->trx_no, first_ts);
				slot_mask[tbf->trx->trx_no] |= (1 << first_ts);
			} else
				LOGP(DRLCMAC, LOGL_DEBUG, "- %s uses "
					"already marked TRX=%d TS=%d\n",
					tbf_name(tbf),
					tbf->trx->trx_no, ts);
		}
	}

	/* Now we have a list of marked slots. Every TBF uses at least one
	 * of these slots. */

	/* schedule paging to all marked slots */
	for (trx = 0; trx < 8; trx++) {
		if (slot_mask[trx] == 0)
			continue;
		for (ts = 0; ts < 8; ts++) {
			if ((slot_mask[trx] & (1 << ts))) {
				/* schedule */
				pag = talloc_zero(tall_pcu_ctx,
					struct gprs_rlcmac_paging);
				if (!pag)
					return -ENOMEM;
				pag->chan_needed = chan_needed;
				memcpy(pag->identity_lv, identity_lv,
					identity_lv[0] + 1);
				m_bts.trx[trx].pdch[ts].add_paging(pag);
				LOGP(DRLCMAC, LOGL_INFO, "Paging on PACCH of "
					"TRX=%d TS=%d\n", trx, ts);
				any_tbf = 1;
			}
		}
	}

	if (!any_tbf)
		LOGP(DRLCMAC, LOGL_INFO, "No paging, because no TBF\n");

	return 0;
}

gprs_rlcmac_dl_tbf *BTS::dl_tbf_by_poll_fn(uint32_t fn, uint8_t trx, uint8_t ts)
{
	struct gprs_rlcmac_dl_tbf *tbf;
	LListHead<gprs_rlcmac_tbf> *pos;

	/* only one TBF can poll on specific TS/FN, because scheduler can only
	 * schedule one downlink control block (with polling) at a FN per TS */
	llist_for_each(pos, &m_dl_tbfs) {
		tbf = as_dl_tbf(pos->entry());
		if (tbf->state_is_not(GPRS_RLCMAC_RELEASING)
		 && tbf->poll_state == GPRS_RLCMAC_POLL_SCHED
		 && tbf->poll_fn == fn && tbf->trx->trx_no == trx
		 && tbf->poll_ts == ts) {
			return tbf;
		}
	}
	return NULL;
}
gprs_rlcmac_ul_tbf *BTS::ul_tbf_by_poll_fn(uint32_t fn, uint8_t trx, uint8_t ts)
{
	struct gprs_rlcmac_ul_tbf *tbf;
	LListHead<gprs_rlcmac_tbf> *pos;

	/* only one TBF can poll on specific TS/FN, because scheduler can only
	 * schedule one downlink control block (with polling) at a FN per TS */
	llist_for_each(pos, &m_ul_tbfs) {
		tbf = as_ul_tbf(pos->entry());
		if (tbf->state_is_not(GPRS_RLCMAC_RELEASING)
		 && tbf->poll_state == GPRS_RLCMAC_POLL_SCHED
		 && tbf->poll_fn == fn && tbf->trx->trx_no == trx
		 && tbf->poll_ts == ts) {
			return tbf;
		}
	}
	return NULL;
}

/* lookup downlink TBF Entity (by TFI) */
gprs_rlcmac_dl_tbf *BTS::dl_tbf_by_tfi(uint8_t tfi, uint8_t trx, uint8_t ts)
{
	if (trx >= 8 || ts >= 8)
		return NULL;

	return m_bts.trx[trx].pdch[ts].dl_tbf_by_tfi(tfi);
}

/* lookup uplink TBF Entity (by TFI) */
gprs_rlcmac_ul_tbf *BTS::ul_tbf_by_tfi(uint8_t tfi, uint8_t trx, uint8_t ts)
{
	if (trx >= 8 || ts >= 8)
		return NULL;

	return m_bts.trx[trx].pdch[ts].ul_tbf_by_tfi(tfi);
}

/*
 * Search for free TFI and return TFI, TRX.
 * This method returns the first TFI that is currently not used in any PDCH of
 * a TRX. The first TRX that contains such an TFI is returned. Negative values
 * indicate errors.
 */
int BTS::tfi_find_free(enum gprs_rlcmac_tbf_direction dir,
		uint8_t *_trx, int8_t use_trx)
{
	struct gprs_rlcmac_pdch *pdch;
	uint32_t free_tfis;
	bool has_pdch = false;
	uint8_t trx_from, trx_to, trx, ts, tfi;

	if (use_trx >= 0 && use_trx < 8)
		trx_from = trx_to = use_trx;
	else {
		trx_from = 0;
		trx_to = 7;
	}

	/* find a TFI that is unused on all PDCH */
	for (trx = trx_from; trx <= trx_to; trx++) {
		bool trx_has_pdch = false;

		free_tfis = 0xffffffff;

		for (ts = 0; ts < 8; ts++) {
			pdch = &m_bts.trx[trx].pdch[ts];
			if (!pdch->is_enabled())
				continue;
			free_tfis &= ~pdch->assigned_tfi(dir);
			trx_has_pdch = true;
			has_pdch = true;
		}
		if (trx_has_pdch && free_tfis)
			break;

		free_tfis = 0;
	}
	if (!has_pdch) {
		LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH available.\n");
		return -EINVAL;
	}

	if (!free_tfis) {
		LOGP(DRLCMAC, LOGL_NOTICE, "No TFI available.\n");
		return -EBUSY;
	}


	LOGP(DRLCMAC, LOGL_DEBUG,
		"Searching for first unallocated TFI: TRX=%d\n", trx);

	/* find the first */
	for (tfi = 0; tfi < 32; tfi++) {
		if (free_tfis & 1 << tfi)
			break;
	}

	OSMO_ASSERT(tfi < 32);

	LOGP(DRLCMAC, LOGL_DEBUG, " Found TFI=%d.\n", tfi);
	*_trx = trx;
	return tfi;
}

int BTS::rcv_imm_ass_cnf(const uint8_t *data, uint32_t fn)
{
	struct gprs_rlcmac_dl_tbf *dl_tbf = NULL;
	uint8_t plen;
	uint32_t tlli;
	GprsMs *ms;

	/* move to IA Rest Octets */
	plen = data[0] >> 2;
	data += 1 + plen;

	if ((*data & 0xf0) != 0xd0) {
		LOGP(DRLCMAC, LOGL_ERROR, "Got IMM.ASS confirm, but rest "
			"octets do not start with bit sequence 'HH01' "
			"(Packet Downlink Assignment)\n");
		return -EINVAL;
	}

	/* get TLLI from downlink assignment */
	tlli = (*data++) << 28;
	tlli |= (*data++) << 20;
	tlli |= (*data++) << 12;
	tlli |= (*data++) << 4;
	tlli |= (*data++) >> 4;

	ms = ms_by_tlli(tlli);
	if (ms)
		dl_tbf = ms->dl_tbf();
	if (!dl_tbf) {
		LOGP(DRLCMAC, LOGL_ERROR, "Got IMM.ASS confirm, but TLLI=%08x "
			"does not exit\n", tlli);
		return -EINVAL;
	}

	LOGP(DRLCMAC, LOGL_DEBUG, "Got IMM.ASS confirm for TLLI=%08x\n", tlli);

	if (dl_tbf->m_wait_confirm)
		tbf_timer_start(dl_tbf, 0, Tassign_agch);

	return 0;
}

int BTS::rcv_rach(uint16_t ra, uint32_t Fn, int16_t qta, uint8_t is_11bit,
		enum ph_burst_type burst_type)
{
	struct gprs_rlcmac_ul_tbf *tbf = NULL;
	uint8_t trx_no, ts_no = 0;
	uint8_t sb = 0;
	uint32_t sb_fn = 0;
	int rc;
	int plen;
	uint8_t usf = 7;
	uint8_t tsc;
	uint16_t ta;
	uint16_t ms_class = 0;
	uint16_t priority = 0;

	rach_frame();

	LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF on RACH, so we provide "
		"one:\n");

	sb = is_single_block(ra, burst_type, is_11bit, &ms_class, &priority);

	if (qta < 0)
		qta = 0;
	if (qta > 252)
		qta = 252;

	ta = qta >> 2;

	if (sb) {
		rc = sba()->alloc(&trx_no, &ts_no, &sb_fn, ta);
		if (rc < 0)
			return rc;
		LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] RACH qbit-ta=%d "
			"ra=0x%02x, Fn=%d (%d,%d,%d), SBFn=%d\n",
			qta, ra,
			Fn, (Fn / (26 * 51)) % 32, Fn % 51, Fn % 26,
			sb_fn);
		LOGP(DRLCMAC, LOGL_INFO, "TX: Immediate Assignment Uplink "
			"(AGCH)\n");
		tsc = m_bts.trx[trx_no].pdch[ts_no].tsc;
	} else {
		// Create new TBF
		#warning "Copy and paste with other routines.."

		if (is_11bit) {
			tbf = tbf_alloc_ul_tbf(&m_bts, NULL, -1, 0,
				ms_class, 1);
		} else {
			/* set class to 0, since we don't know the multislot
			 * class yet */
			tbf = tbf_alloc_ul_tbf(&m_bts, NULL, -1, 0, 0, 1);
		}

		if (!tbf) {
			LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH resource\n");
			/* FIXME: send reject */
			return -EBUSY;
		}
		tbf->set_ta(ta);
		tbf->set_state(GPRS_RLCMAC_FLOW);
		tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_CCCH);
		tbf_timer_start(tbf, 3169, m_bts.t3169, 0);
		LOGP(DRLCMAC, LOGL_DEBUG, "%s [UPLINK] START\n",
			tbf_name(tbf));
		LOGP(DRLCMAC, LOGL_DEBUG, "%s RX: [PCU <- BTS] RACH "
			"qbit-ta=%d ra=0x%02x, Fn=%d (%d,%d,%d)\n",
			tbf_name(tbf),
			qta, ra, Fn, (Fn / (26 * 51)) % 32, Fn % 51, Fn % 26);
		LOGP(DRLCMAC, LOGL_INFO, "%s TX: START Immediate "
			"Assignment Uplink (AGCH)\n", tbf_name(tbf));
		trx_no = tbf->trx->trx_no;
		ts_no = tbf->first_ts;
		usf = tbf->m_usf[ts_no];
		tsc = tbf->tsc();
	}
	bitvec *immediate_assignment = bitvec_alloc(22) /* without plen */;
	bitvec_unhex(immediate_assignment,
		"2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");

	LOGP(DRLCMAC, LOGL_DEBUG,
		" - TRX=%d (%d) TS=%d TA=%d TSC=%d TFI=%d USF=%d\n",
		trx_no, m_bts.trx[trx_no].arfcn, ts_no, ta, tsc,
		tbf ? tbf->tfi() : -1, usf);

	plen = Encoding::write_immediate_assignment(
		tbf, immediate_assignment, 0, ra, Fn, ta,
		m_bts.trx[trx_no].arfcn, ts_no, tsc, usf, 0, sb_fn,
		m_bts.alpha, m_bts.gamma, -1, burst_type, sb);

	if (plen >= 0) {
		pcu_l1if_tx_agch(immediate_assignment, plen);
		if (tbf)
			tbf->set_state(GPRS_RLCMAC_WAIT_ASSIGN);
	}

	bitvec_free(immediate_assignment);

	return 0;
}

uint8_t BTS::is_single_block(uint16_t ra, enum ph_burst_type burst_type,
		uint8_t is_11bit, uint16_t *ms_class, uint16_t *priority)
{
	uint8_t sb = 0, val = 0;

	if (!is_11bit && (burst_type == GSM_L1_BURST_TYPE_ACCESS_0)) {

		if ((ra & 0xf8) == 0x70) {
			LOGP(DRLCMAC, LOGL_DEBUG, "MS requests single block "
				"allocation\n");
			sb = 1;
		} else if (m_bts.force_two_phase) {
			LOGP(DRLCMAC, LOGL_DEBUG, "MS requests single "
				"phase access, but we force two phase "
				"access\n");
			sb = 1;
		}

	} else if (is_11bit &&
		((burst_type == GSM_L1_BURST_TYPE_ACCESS_1) ||
		(burst_type == GSM_L1_BURST_TYPE_ACCESS_2))) {

		val = !!(ra & (1 << 10));

		if (!val) {
			if (m_bts.force_two_phase) {
				LOGP(DRLCMAC, LOGL_DEBUG, "EGPRS 11 bit RACH "
					"received. MS requests single phase "
					"access but we force two phase "
					"access\n");
				sb = 1;
			} else {
				sb = 0;
				*ms_class = (ra & 0x3e0) >> 5;
				*priority = (ra & 0x18) >> 3;
			}

		} else {
			LOGP(DRLCMAC, LOGL_DEBUG, "EGPRS 11 bit RACH received."
				"MS requests single block allocation\n");
			sb = 1;
		}

	} else if (is_11bit &&
		(burst_type == GSM_L1_BURST_TYPE_ACCESS_0)) {
		LOGP(DRLCMAC, LOGL_ERROR,
			"Error: GPRS 11 bit RACH not supported\n");

	} else if (burst_type == GSM_L1_BURST_TYPE_NONE) {
		LOGP(DRLCMAC, LOGL_DEBUG, "pcu has not received burst type "
			"from bts \n");

		if ((ra & 0xf8) == 0x70) {
			LOGP(DRLCMAC, LOGL_DEBUG, "MS requests single block "
				"allocation\n");
			sb = 1;
		} else if (m_bts.force_two_phase) {
			LOGP(DRLCMAC, LOGL_DEBUG, "MS requests single "
				"phase access, but we force two phase "
				"access\n");
			sb = 1;
		}
	}

	return sb;
}

/* depending on the current TBF, we assign on PACCH or AGCH */
void BTS::trigger_dl_ass(
	struct gprs_rlcmac_dl_tbf *dl_tbf,
	struct gprs_rlcmac_tbf *old_tbf)
{
	/* stop pending timer */
	dl_tbf->stop_timer();

	/* check for downlink tbf:  */
	if (old_tbf) {
		LOGP(DRLCMAC, LOGL_DEBUG, "Send dowlink assignment on "
			"PACCH, because %s exists\n", tbf_name(old_tbf));
		old_tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_SEND_ASS;

		old_tbf->was_releasing = old_tbf->state_is(GPRS_RLCMAC_WAIT_RELEASE);

		/* change state */
		dl_tbf->set_state(GPRS_RLCMAC_ASSIGN);
		if (!(dl_tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH)))
			dl_tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_PACCH);
		/* start timer */
		tbf_timer_start(dl_tbf, 0, Tassign_pacch);
	} else {
		LOGP(DRLCMAC, LOGL_DEBUG, "Send dowlink assignment for %s on PCH, no TBF exist (IMSI=%s)\n", tbf_name(dl_tbf), dl_tbf->imsi());
		dl_tbf->was_releasing = dl_tbf->state_is(GPRS_RLCMAC_WAIT_RELEASE);
		/* change state */
		dl_tbf->set_state(GPRS_RLCMAC_ASSIGN);
		dl_tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_CCCH);
		/* send immediate assignment */
		dl_tbf->bts->snd_dl_ass(dl_tbf, 0, dl_tbf->imsi());
		dl_tbf->m_wait_confirm = 1;
	}
}

void BTS::snd_dl_ass(gprs_rlcmac_tbf *tbf, uint8_t poll, const char *imsi)
{
	int plen;
	unsigned int ts = tbf->first_ts;

	LOGP(DRLCMAC, LOGL_INFO, "TX: START %s Immediate Assignment Downlink (PCH)\n", tbf_name(tbf));
	bitvec *immediate_assignment = bitvec_alloc(22); /* without plen */
	bitvec_unhex(immediate_assignment, "2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b2b");
	/* use request reference that has maximum distance to current time,
	 * so the assignment will not conflict with possible RACH requests. */
	LOGP(DRLCMAC, LOGL_DEBUG, " - TRX=%d (%d) TS=%d TA=%d pollFN=%d\n",
		tbf->trx->trx_no, tbf->trx->arfcn,
		ts, tbf->ta(), poll ? tbf->poll_fn : -1);
	plen = Encoding::write_immediate_assignment(tbf, immediate_assignment, 1, 125,
		(tbf->pdch[ts]->last_rts_fn + 21216) % 2715648, tbf->ta(),
		tbf->trx->arfcn, ts, tbf->tsc(), 7, poll,
		tbf->poll_fn, m_bts.alpha, m_bts.gamma, -1);
	if (plen >= 0) {
		pcu_l1if_tx_pch(immediate_assignment, plen, imsi);
		tbf->set_state(GPRS_RLCMAC_WAIT_ASSIGN);
	}
	bitvec_free(immediate_assignment);
}


GprsMs *BTS::ms_alloc(uint8_t ms_class, uint8_t egprs_ms_class)
{
	GprsMs *ms;
	ms = ms_store().create_ms();

	ms->set_timeout(m_bts.ms_idle_sec);
	ms->set_ms_class(ms_class);
	ms->set_egprs_ms_class(egprs_ms_class);

	return ms;
}

/*
 * PDCH code below. TODO: move to a separate file
 */

void gprs_rlcmac_pdch::enable()
{
	/* TODO: Check if there are still allocated resources.. */
	INIT_LLIST_HEAD(&paging_list);
	m_is_enabled = 1;
}

void gprs_rlcmac_pdch::disable()
{
	/* TODO.. kick free_resources once we know the TRX/TS we are on */
	m_is_enabled = 0;
}

void gprs_rlcmac_pdch::free_resources()
{
	struct gprs_rlcmac_paging *pag;

	/* we are not enabled. there should be no resources */
	if (!is_enabled())
		return;

	/* kick all TBF on slot */
	gprs_rlcmac_tbf::free_all(this);

	/* flush all pending paging messages */
	while ((pag = dequeue_paging()))
		talloc_free(pag);

	trx->bts->sba()->free_resources(this);
}

struct gprs_rlcmac_paging *gprs_rlcmac_pdch::dequeue_paging()
{
	struct gprs_rlcmac_paging *pag;

	if (llist_empty(&paging_list))
		return NULL;
	pag = llist_entry(paging_list.next, struct gprs_rlcmac_paging, list);
	llist_del(&pag->list);

	return pag;
}

struct msgb *gprs_rlcmac_pdch::packet_paging_request()
{
	struct gprs_rlcmac_paging *pag;
	struct msgb *msg;
	unsigned wp = 0, len;

	/* no paging, no message */
	pag = dequeue_paging();
	if (!pag)
		return NULL;

	LOGP(DRLCMAC, LOGL_DEBUG, "Scheduling paging\n");

	/* alloc message */
	msg = msgb_alloc(23, "pag ctrl block");
	if (!msg) {
		talloc_free(pag);
		return NULL;
	}
	bitvec *pag_vec = bitvec_alloc(23);
	if (!pag_vec) {
		msgb_free(msg);
		talloc_free(pag);
		return NULL;
	}
	wp = Encoding::write_packet_paging_request(pag_vec);

	/* loop until message is full */
	while (pag) {
		/* try to add paging */
		if ((pag->identity_lv[1] & 0x07) == 4) {
			/* TMSI */
			LOGP(DRLCMAC, LOGL_DEBUG, "- TMSI=0x%08x\n",
				ntohl(*((uint32_t *)(pag->identity_lv + 1))));
			len = 1 + 1 + 1 + 32 + 2 + 1;
			if (pag->identity_lv[0] != 5) {
				LOGP(DRLCMAC, LOGL_ERROR, "TMSI paging with "
					"MI != 5 octets!\n");
				goto continue_next;
			}
		} else {
			/* MI */
			LOGP(DRLCMAC, LOGL_DEBUG, "- MI=%s\n",
				osmo_hexdump(pag->identity_lv + 1,
					pag->identity_lv[0]));
			len = 1 + 1 + 1 + 4 + (pag->identity_lv[0]<<3) + 2 + 1;
			if (pag->identity_lv[0] > 8) {
				LOGP(DRLCMAC, LOGL_ERROR, "Paging with "
					"MI > 8 octets!\n");
				goto continue_next;
			}
		}
		if (wp + len > 184) {
			LOGP(DRLCMAC, LOGL_DEBUG, "- Does not fit, so schedule "
				"next time\n");
			/* put back paging record, because does not fit */
			llist_add_tail(&pag->list, &paging_list);
			break;
		}
		Encoding::write_repeated_page_info(pag_vec, wp, pag->identity_lv[0],
			pag->identity_lv + 1, pag->chan_needed);

continue_next:
		talloc_free(pag);
		pag = dequeue_paging();
	}

	bitvec_pack(pag_vec, msgb_put(msg, 23));
	RlcMacDownlink_t * mac_control_block = (RlcMacDownlink_t *)talloc_zero(tall_pcu_ctx, RlcMacDownlink_t);
	LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ TX : Packet Paging Request +++++++++++++++++++++++++\n");
	decode_gsm_rlcmac_downlink(pag_vec, mac_control_block);
	LOGPC(DCSN1, LOGL_NOTICE, "\n");
	LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- TX : Packet Paging Request -------------------------\n");
	bitvec_free(pag_vec);
	talloc_free(mac_control_block);

	return msg;
}

void gprs_rlcmac_pdch::add_paging(struct gprs_rlcmac_paging *pag)
{
	llist_add(&pag->list, &paging_list);
}

void gprs_rlcmac_pdch::rcv_control_ack(Packet_Control_Acknowledgement_t *packet, uint32_t fn)
{
	struct gprs_rlcmac_tbf *tbf, *new_tbf;
	uint32_t tlli = 0;

	tlli = packet->TLLI;
	tbf = bts()->ul_tbf_by_poll_fn(fn, trx_no(), ts_no);
	if (!tbf)
		tbf = bts()->dl_tbf_by_poll_fn(fn, trx_no(), ts_no);

	if (!tbf) {
		LOGP(DRLCMAC, LOGL_NOTICE, "PACKET CONTROL ACK with "
			"unknown FN=%u TLLI=0x%08x (TRX %d TS %d)\n",
			fn, tlli, trx_no(), ts_no);
		return;
	}
	tbf->update_ms(tlli, GPRS_RLCMAC_UL_TBF);

	LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] %s Packet Control Ack\n", tbf_name(tbf));
	tbf->poll_state = GPRS_RLCMAC_POLL_NONE;

	/* check if this control ack belongs to packet uplink ack */
	if (tbf->ul_ack_state == GPRS_RLCMAC_UL_ACK_WAIT_ACK) {
		LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] END %s\n", tbf_name(tbf));
		tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE;
		if ((tbf->state_flags &
			(1 << GPRS_RLCMAC_FLAG_TO_UL_ACK))) {
			tbf->state_flags &=
				~(1 << GPRS_RLCMAC_FLAG_TO_UL_ACK);
				LOGP(DRLCMAC, LOGL_NOTICE, "Recovered uplink "
					"ack for UL %s\n", tbf_name(tbf));
		}
		tbf_free(tbf);
		return;
	}
	if (tbf->dl_ass_state == GPRS_RLCMAC_DL_ASS_WAIT_ACK) {
		LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [UPLINK] DOWNLINK ASSIGNED %s\n", tbf_name(tbf));
		/* reset N3105 */
		tbf->n3105 = 0;
		tbf->dl_ass_state = GPRS_RLCMAC_DL_ASS_NONE;

		new_tbf = tbf->ms() ? tbf->ms()->dl_tbf() : NULL;
		if (!new_tbf) {
			LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but DL "
				"TBF is gone TLLI=0x%08x\n", tlli);
			return;
		}
		if (tbf->state_is(GPRS_RLCMAC_WAIT_RELEASE) &&
				tbf->direction == new_tbf->direction)
			tbf_free(tbf);

		if ((new_tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_CCCH))) {
			/* We now know that the PACCH really existed */
			LOGP(DRLCMAC, LOGL_INFO,
				"The TBF has been confirmed on the PACCH, "
				"changed type from CCCH to PACCH for %s\n",
				tbf_name(new_tbf));
			new_tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH);
			new_tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_PACCH);
		}
		new_tbf->set_state(GPRS_RLCMAC_FLOW);
		/* stop pending assignment timer */
		new_tbf->stop_timer();
		if ((new_tbf->state_flags &
			(1 << GPRS_RLCMAC_FLAG_TO_DL_ASS))) {
			new_tbf->state_flags &=
				~(1 << GPRS_RLCMAC_FLAG_TO_DL_ASS);
			LOGP(DRLCMAC, LOGL_NOTICE, "Recovered downlink "
				"assignment for %s\n", tbf_name(new_tbf));
		}
		tbf_assign_control_ts(new_tbf);
		return;
	}
	if (tbf->ul_ass_state == GPRS_RLCMAC_UL_ASS_WAIT_ACK) {
		LOGP(DRLCMAC, LOGL_DEBUG, "TBF: [DOWNLINK] UPLINK ASSIGNED %s\n", tbf_name(tbf));
		/* reset N3105 */
		tbf->n3105 = 0;
		tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_NONE;

		new_tbf = tbf->ms() ? tbf->ms()->ul_tbf() : NULL;
		if (!new_tbf) {
			LOGP(DRLCMAC, LOGL_ERROR, "Got ACK, but UL "
				"TBF is gone TLLI=0x%08x\n", tlli);
			return;
		}
		if (tbf->state_is(GPRS_RLCMAC_WAIT_RELEASE) &&
				tbf->direction == new_tbf->direction)
			tbf_free(tbf);

		new_tbf->set_state(GPRS_RLCMAC_FLOW);
		if ((new_tbf->state_flags &
			(1 << GPRS_RLCMAC_FLAG_TO_UL_ASS))) {
			new_tbf->state_flags &=
				~(1 << GPRS_RLCMAC_FLAG_TO_UL_ASS);
			LOGP(DRLCMAC, LOGL_NOTICE, "Recovered uplink "
				"assignment for UL %s\n", tbf_name(new_tbf));
		}
		tbf_assign_control_ts(new_tbf);
		/* there might be LLC packets waiting in the queue, but the DL
		 * TBF might have been released while the UL TBF has been
		 * established */
		if (new_tbf->ms()->need_dl_tbf())
			new_tbf->establish_dl_tbf_on_pacch();

		return;
	}
	LOGP(DRLCMAC, LOGL_ERROR, "Error: received PACET CONTROL ACK "
		"at no request\n");
}

static void get_rx_qual_meas(struct pcu_l1_meas *meas, uint8_t rx_qual_enc)
{
	static const int16_t rx_qual_map[] = {
		0, /* 0,14 % */
		0, /* 0,28 % */
		1, /* 0,57 % */
		1, /* 1,13 % */
		2, /* 2,26 % */
		5, /* 4,53 % */
		9, /* 9,05 % */
		18, /* 18,10 % */
	};

	meas->set_ms_rx_qual(rx_qual_map[
		OSMO_MIN(rx_qual_enc, ARRAY_SIZE(rx_qual_map)-1)
		]);
}

static void get_meas(struct pcu_l1_meas *meas,
	const Packet_Resource_Request_t *qr)
{
	unsigned i;

	meas->set_ms_c_value(qr->C_VALUE);
	if (qr->Exist_SIGN_VAR)
		meas->set_ms_sign_var((qr->SIGN_VAR + 2) / 4); /* SIGN_VAR * 0.25 dB */

	for (i = 0; i < OSMO_MIN(ARRAY_SIZE(qr->Slot), ARRAY_SIZE(meas->ts)); i++)
	{
		if (qr->Slot[i].Exist) {
			LOGP(DRLCMAC, LOGL_INFO,
				"Packet resource request: i_level[%d] = %d\n",
				i, qr->Slot[i].I_LEVEL);
			meas->set_ms_i_level(i, -2 * qr->Slot[i].I_LEVEL);
		}
	}
}

static void get_meas(struct pcu_l1_meas *meas,
	const Channel_Quality_Report_t *qr)
{
	unsigned i;

	get_rx_qual_meas(meas, qr->RXQUAL);
	meas->set_ms_c_value(qr->C_VALUE);
	meas->set_ms_sign_var((qr->SIGN_VAR + 2) / 4); /* SIGN_VAR * 0.25 dB */

	for (i = 0; i < OSMO_MIN(ARRAY_SIZE(qr->Slot), ARRAY_SIZE(meas->ts)); i++)
	{
		if (qr->Slot[i].Exist) {
			LOGP(DRLCMAC, LOGL_INFO,
				"Channel quality report: i_level[%d] = %d\n",
				i, qr->Slot[i].I_LEVEL_TN);
			meas->set_ms_i_level(i, -2 * qr->Slot[i].I_LEVEL_TN);
		}
	}
}

void gprs_rlcmac_pdch::rcv_control_dl_ack_nack(Packet_Downlink_Ack_Nack_t *ack_nack, uint32_t fn)
{
	int8_t tfi = 0; /* must be signed */
	struct gprs_rlcmac_dl_tbf *tbf;
	int rc;
	struct pcu_l1_meas meas;
	int num_blocks;
	uint8_t bits_data[RLC_GPRS_WS/8];
	bitvec bits;
	int bsn_begin, bsn_end;
	char show_bits[RLC_GPRS_WS + 1];

	tfi = ack_nack->DOWNLINK_TFI;
	tbf = bts()->dl_tbf_by_poll_fn(fn, trx_no(), ts_no);
	if (!tbf) {
		LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with "
			"unknown FN=%u TFI=%d (TRX %d TS %d)\n",
			fn, tfi, trx_no(), ts_no);
		return;
	}
	if (tbf->tfi() != tfi) {
		LOGP(DRLCMAC, LOGL_NOTICE, "PACKET DOWNLINK ACK with "
			"wrong TFI=%d, ignoring!\n", tfi);
		return;
	}
	tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_DL_ACK);
	if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK))) {
		tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ACK);
		LOGP(DRLCMAC, LOGL_NOTICE, "Recovered downlink ack "
			"for %s\n", tbf_name(tbf));
	}
	/* reset N3105 */
	tbf->n3105 = 0;
	tbf->stop_t3191();
	LOGP(DRLCMAC, LOGL_DEBUG, "RX: [PCU <- BTS] %s Packet Downlink Ack/Nack\n", tbf_name(tbf));
	tbf->poll_state = GPRS_RLCMAC_POLL_NONE;

	bits.data = bits_data;
	bits.data_len = sizeof(bits_data);
	bits.cur_bit = 0;

	num_blocks = Decoding::decode_gprs_acknack_bits(
		&ack_nack->Ack_Nack_Description, &bits,
		&bsn_begin, &bsn_end, &tbf->m_window);

	LOGP(DRLCMAC, LOGL_DEBUG,
		"Got GPRS DL ACK bitmap: SSN: %d, BSN %d to %d - 1 (%d blocks), "
		"\"%s\"\n",
		ack_nack->Ack_Nack_Description.STARTING_SEQUENCE_NUMBER,
		bsn_begin, bsn_end, num_blocks,
		(Decoding::extract_rbb(&bits, show_bits), show_bits));

	rc = tbf->rcvd_dl_ack(
		ack_nack->Ack_Nack_Description.FINAL_ACK_INDICATION,
		bsn_begin, &bits);
	if (rc == 1) {
		tbf_free(tbf);
		return;
	}
	/* check for channel request */
	if (ack_nack->Exist_Channel_Request_Description) {
		LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF in ack "
			"message, so we provide one:\n");

		/* This call will register the new TBF with the MS on success */
		tbf_alloc_ul(bts_data(), tbf->trx->trx_no,
			tbf->ms_class(), tbf->ms()->egprs_ms_class(),
			tbf->tlli(), tbf->ta(), tbf->ms());

		/* schedule uplink assignment */
		tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS;
	}
	/* get measurements */
	if (tbf->ms()) {
		get_meas(&meas, &ack_nack->Channel_Quality_Report);
		tbf->ms()->update_l1_meas(&meas);
	}
}

void gprs_rlcmac_pdch::rcv_control_egprs_dl_ack_nack(EGPRS_PD_AckNack_t *ack_nack, uint32_t fn)
{
	int8_t tfi = 0; /* must be signed */
	struct gprs_rlcmac_dl_tbf *tbf;
	struct pcu_l1_meas meas;
	int rc;
	int num_blocks;
	uint8_t bits_data[RLC_EGPRS_MAX_WS/8];
	char show_bits[RLC_EGPRS_MAX_WS + 1];
	bitvec bits;
	int bsn_begin, bsn_end;

	tfi = ack_nack->DOWNLINK_TFI;
	tbf = bts()->dl_tbf_by_poll_fn(fn, trx_no(), ts_no);
	if (!tbf) {
		LOGP(DRLCMAC, LOGL_NOTICE, "EGPRS PACKET DOWNLINK ACK with "
			"unknown FN=%u TFI=%d (TRX %d TS %d)\n",
			fn, tfi, trx_no(), ts_no);
		return;
	}
	if (tbf->tfi() != tfi) {
		LOGP(DRLCMAC, LOGL_NOTICE, "EGPRS PACKET DOWNLINK ACK with "
			"wrong TFI=%d, ignoring!\n", tfi);
		return;
	}
	tbf->state_flags |= (1 << GPRS_RLCMAC_FLAG_DL_ACK);
	if ((tbf->state_flags & (1 << GPRS_RLCMAC_FLAG_TO_DL_ACK))) {
		tbf->state_flags &= ~(1 << GPRS_RLCMAC_FLAG_TO_DL_ACK);
		LOGP(DRLCMAC, LOGL_NOTICE, "Recovered EGPRS downlink ack "
			"for %s\n", tbf_name(tbf));
	}
	/* reset N3105 */
	tbf->n3105 = 0;
	tbf->stop_t3191();
	LOGP(DRLCMAC, LOGL_DEBUG,
		"RX: [PCU <- BTS] %s EGPRS Packet Downlink Ack/Nack\n",
		tbf_name(tbf));
	tbf->poll_state = GPRS_RLCMAC_POLL_NONE;

	LOGP(DRLCMAC, LOGL_DEBUG, "EGPRS ACK/NACK: "
		"ut: %d, final: %d, bow: %d, eow: %d, ssn: %d, have_crbb: %d, "
		"urbb_len:%d, %p, %p, %d, %d, win: %d-%d, urbb: %s\n",
		(int)ack_nack->EGPRS_AckNack.UnionType,
		(int)ack_nack->EGPRS_AckNack.Desc.FINAL_ACK_INDICATION,
		(int)ack_nack->EGPRS_AckNack.Desc.BEGINNING_OF_WINDOW,
		(int)ack_nack->EGPRS_AckNack.Desc.END_OF_WINDOW,
		(int)ack_nack->EGPRS_AckNack.Desc.STARTING_SEQUENCE_NUMBER,
		(int)ack_nack->EGPRS_AckNack.Desc.Exist_CRBB,
		(int)ack_nack->EGPRS_AckNack.Desc.URBB_LENGTH,
		(void *)&ack_nack->EGPRS_AckNack.UnionType,
		(void *)&ack_nack->EGPRS_AckNack.Desc,
		(int)offsetof(EGPRS_AckNack_t, Desc),
		(int)offsetof(EGPRS_AckNack_w_len_t, Desc),
		tbf->m_window.v_a(),
		tbf->m_window.v_s(),
		osmo_hexdump((const uint8_t *)&ack_nack->EGPRS_AckNack.Desc.URBB,
			sizeof(ack_nack->EGPRS_AckNack.Desc.URBB)));

	bits.data = bits_data;
	bits.data_len = sizeof(bits_data);
	bits.cur_bit = 0;

	num_blocks = Decoding::decode_egprs_acknack_bits(
		&ack_nack->EGPRS_AckNack.Desc, &bits,
		&bsn_begin, &bsn_end, &tbf->m_window);

	LOGP(DRLCMAC, LOGL_DEBUG,
		"Got EGPRS DL ACK bitmap: SSN: %d, BSN %d to %d - 1 (%d blocks), "
		"\"%s\"\n",
		ack_nack->EGPRS_AckNack.Desc.STARTING_SEQUENCE_NUMBER,
		bsn_begin, bsn_end, num_blocks,
		(Decoding::extract_rbb(&bits, show_bits), show_bits)
	    );

	rc = tbf->rcvd_dl_ack(
		ack_nack->EGPRS_AckNack.Desc.FINAL_ACK_INDICATION,
		bsn_begin, &bits);
	if (rc == 1) {
		tbf_free(tbf);
		return;
	}

	/* check for channel request */
	if (ack_nack->Exist_ChannelRequestDescription) {
		LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF in ack "
			"message, so we provide one:\n");

		/* This call will register the new TBF with the MS on success */
		tbf_alloc_ul(bts_data(), tbf->trx->trx_no,
			tbf->ms_class(), tbf->ms()->egprs_ms_class(),
			tbf->tlli(), tbf->ta(), tbf->ms());

		/* schedule uplink assignment */
		tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS;
	}

	/* get measurements */
	if (tbf->ms()) {
		/* TODO: Implement Measurements parsing for EGPRS */
		/*
		get_meas(&meas, &ack_nack->Channel_Quality_Report);
		tbf->ms()->update_l1_meas(&meas);
		*/
	}
}

void gprs_rlcmac_pdch::rcv_resource_request(Packet_Resource_Request_t *request, uint32_t fn)
{
	struct gprs_rlcmac_sba *sba;

	if (request->ID.UnionType) {
		struct gprs_rlcmac_ul_tbf *ul_tbf = NULL;
		struct gprs_rlcmac_dl_tbf *dl_tbf = NULL;
		uint32_t tlli = request->ID.u.TLLI;
		uint8_t ms_class = 0;
		uint8_t egprs_ms_class = 0;
		uint8_t ta = GSM48_TA_INVALID;
		struct pcu_l1_meas meas;

		GprsMs *ms = bts()->ms_by_tlli(tlli);
		/* Keep the ms, even if it gets idle temporarily */
		GprsMs::Guard guard(ms);

		if (ms) {
			ul_tbf = ms->ul_tbf();
			dl_tbf = ms->dl_tbf();
			ta = ms->ta();
		}

		/* We got a RACH so the MS was in packet idle mode and thus
		 * didn't have any active TBFs */
		if (ul_tbf) {
			LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from "
				"TLLI=0x%08x while %s still "
				"exists. Killing pending UL TBF\n",
				tlli, tbf_name(ul_tbf));
			tbf_free(ul_tbf);
			ul_tbf = NULL;
		}

		if (dl_tbf) {
			LOGP(DRLCMACUL, LOGL_NOTICE, "Got RACH from "
				"TLLI=0x%08x while %s still exists. "
				"Release pending DL TBF\n", tlli,
				tbf_name(dl_tbf));
			tbf_free(dl_tbf);
			dl_tbf = NULL;
		}
		LOGP(DRLCMAC, LOGL_DEBUG, "MS requests UL TBF "
			"in packet resource request of single "
			"block, so we provide one:\n");
		sba = bts()->sba()->find(this, fn);
		if (!sba) {
			LOGP(DRLCMAC, LOGL_NOTICE, "MS requests UL TBF "
				"in packet resource request of single "
				"block, but there is no resource request "
				"scheduled!\n");
		} else {
			ta = sba->ta;
			bts()->sba()->free_sba(sba);
		}
		if (request->Exist_MS_Radio_Access_capability) {
			ms_class = Decoding::get_ms_class_by_capability(
				&request->MS_Radio_Access_capability);
			egprs_ms_class =
				Decoding::get_egprs_ms_class_by_capability(
					&request->MS_Radio_Access_capability);
		}
		if (!ms_class)
			LOGP(DRLCMAC, LOGL_NOTICE, "MS does not give us a class.\n");
		if (egprs_ms_class)
			LOGP(DRLCMAC, LOGL_NOTICE,
				"MS supports EGPRS multislot class %d.\n",
				egprs_ms_class);
		ul_tbf = tbf_alloc_ul(bts_data(), trx_no(), ms_class,
			egprs_ms_class, tlli, ta, ms);
		if (!ul_tbf)
			return;

		/* set control ts to current MS's TS, until assignment complete */
		LOGP(DRLCMAC, LOGL_DEBUG, "Change control TS to %d until assinment is complete.\n", ts_no);
		ul_tbf->control_ts = ts_no;
		/* schedule uplink assignment */
		ul_tbf->ul_ass_state = GPRS_RLCMAC_UL_ASS_SEND_ASS;

		/* get capabilities */
		if (ul_tbf->ms())
			ul_tbf->ms()->set_egprs_ms_class(egprs_ms_class);

		/* get measurements */
		if (ul_tbf->ms()) {
			get_meas(&meas, request);
			ul_tbf->ms()->update_l1_meas(&meas);
		}
		return;
	}

	if (request->ID.u.Global_TFI.UnionType) {
		struct gprs_rlcmac_dl_tbf *dl_tbf;
		int8_t tfi = request->ID.u.Global_TFI.u.DOWNLINK_TFI;
		dl_tbf = bts()->dl_tbf_by_tfi(tfi, trx_no(), ts_no);
		if (!dl_tbf) {
			LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown downlink TFI=%d\n", tfi);
			return;
		}
		LOGP(DRLCMAC, LOGL_ERROR,
			"RX: [PCU <- BTS] %s FIXME: Packet resource request\n",
			tbf_name(dl_tbf));
	} else {
		struct gprs_rlcmac_ul_tbf *ul_tbf;
		int8_t tfi = request->ID.u.Global_TFI.u.UPLINK_TFI;
		ul_tbf = bts()->ul_tbf_by_tfi(tfi, trx_no(), ts_no);
		if (!ul_tbf) {
			LOGP(DRLCMAC, LOGL_NOTICE, "PACKET RESSOURCE REQ unknown uplink TFI=%d\n", tfi);
			return;
		}
		LOGP(DRLCMAC, LOGL_ERROR,
			"RX: [PCU <- BTS] %s FIXME: Packet resource request\n",
			tbf_name(ul_tbf));
	}
}

void gprs_rlcmac_pdch::rcv_measurement_report(Packet_Measurement_Report_t *report, uint32_t fn)
{
	struct gprs_rlcmac_sba *sba;

	sba = bts()->sba()->find(this, fn);
	if (!sba) {
		LOGP(DRLCMAC, LOGL_NOTICE, "MS send measurement "
			"in packet resource request of single "
			"block, but there is no resource request "
			"scheduled! TLLI=0x%08x\n", report->TLLI);
	} else {
		GprsMs *ms = bts()->ms_store().get_ms(report->TLLI);
		if (!ms)
			LOGP(DRLCMAC, LOGL_NOTICE, "MS send measurement "
				"but TLLI 0x%08x is unknown\n", report->TLLI);
		else
			ms->set_ta(sba->ta);

		bts()->sba()->free_sba(sba);
	}
	gprs_rlcmac_meas_rep(report);
}

/* Received Uplink RLC control block. */
int gprs_rlcmac_pdch::rcv_control_block(
	bitvec *rlc_block, uint32_t fn)
{
	RlcMacUplink_t * ul_control_block = (RlcMacUplink_t *)talloc_zero(tall_pcu_ctx, RlcMacUplink_t);
	LOGP(DRLCMAC, LOGL_DEBUG, "+++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++\n");
	decode_gsm_rlcmac_uplink(rlc_block, ul_control_block);
	LOGPC(DCSN1, LOGL_NOTICE, "\n");
	LOGP(DRLCMAC, LOGL_DEBUG, "------------------------- RX : Uplink Control Block -------------------------\n");
	switch (ul_control_block->u.MESSAGE_TYPE) {
	case MT_PACKET_CONTROL_ACK:
		rcv_control_ack(&ul_control_block->u.Packet_Control_Acknowledgement, fn);
		break;
	case MT_PACKET_DOWNLINK_ACK_NACK:
		rcv_control_dl_ack_nack(&ul_control_block->u.Packet_Downlink_Ack_Nack, fn);
		break;
	case MT_EGPRS_PACKET_DOWNLINK_ACK_NACK:
		rcv_control_egprs_dl_ack_nack(&ul_control_block->u.Egprs_Packet_Downlink_Ack_Nack, fn);
		break;
	case MT_PACKET_RESOURCE_REQUEST:
		rcv_resource_request(&ul_control_block->u.Packet_Resource_Request, fn);
		break;
	case MT_PACKET_MEASUREMENT_REPORT:
		rcv_measurement_report(&ul_control_block->u.Packet_Measurement_Report, fn);
		break;
	case MT_PACKET_UPLINK_DUMMY_CONTROL_BLOCK:
		/* ignoring it. change the SI to not force sending these? */
		break;
	default:
		bts()->decode_error();
		LOGP(DRLCMAC, LOGL_NOTICE,
			"RX: [PCU <- BTS] unknown control block(%d) received\n",
			ul_control_block->u.MESSAGE_TYPE);
	}
	talloc_free(ul_control_block);
	return 1;
}


/* received RLC/MAC block from L1 */
int gprs_rlcmac_pdch::rcv_block(uint8_t *data, uint8_t len, uint32_t fn,
	struct pcu_l1_meas *meas)
{
	GprsCodingScheme cs = GprsCodingScheme::getBySizeUL(len);
	if (!cs) {
		bts()->decode_error();
		LOGP(DRLCMACUL, LOGL_ERROR, "Dropping data block with invalid"
			"length: %d)\n", len);
		return -EINVAL;
	}

	bts()->rlc_ul_bytes(len);

	LOGP(DRLCMACUL, LOGL_DEBUG, "Got RLC block, coding scheme: %s, "
		"length: %d (%d))\n", cs.name(), len, cs.usedSizeUL());

	if (cs.isGprs())
		return rcv_block_gprs(data, fn, meas, cs);

	if (cs.isEgprs())
		return rcv_data_block(data, fn, meas, cs);

	bts()->decode_error();
	LOGP(DRLCMACUL, LOGL_ERROR, "Unsupported coding scheme %s\n",
		cs.name());
	return -EINVAL;
}

/*! \brief process egprs and gprs data blocks */
int gprs_rlcmac_pdch::rcv_data_block(uint8_t *data, uint32_t fn,
	struct pcu_l1_meas *meas, GprsCodingScheme cs)
{
	int rc;
	struct gprs_rlc_data_info rlc_dec;
	struct gprs_rlcmac_ul_tbf *tbf;
	unsigned len = cs.sizeUL();

	/* These are always data blocks, since EGPRS still uses CS-1 for
	 * control blocks (see 44.060, section 10.3, 1st par.)
	 */
	if (cs.isEgprs()) {
		if (!bts()->bts_data()->egprs_enabled) {
			LOGP(DRLCMACUL, LOGL_ERROR,
				"Got %s RLC block but EGPRS is not enabled\n",
				cs.name());
			return -EINVAL;
		}
	}

	LOGP(DRLCMACUL, LOGL_DEBUG, "  UL data: %s\n", osmo_hexdump(data, len));

	rc = Decoding::rlc_parse_ul_data_header(&rlc_dec, data, cs);
	if (rc < 0) {
		LOGP(DRLCMACUL, LOGL_ERROR,
			"Got %s RLC block but header parsing has failed\n",
			cs.name());
		bts()->decode_error();
		return rc;
	}

	LOGP(DRLCMACUL, LOGL_INFO,
		"Got %s RLC block: "
		"R=%d, SI=%d, TFI=%d, CPS=%d, RSB=%d, "
		"rc=%d\n",
		cs.name(),
		rlc_dec.r, rlc_dec.si, rlc_dec.tfi, rlc_dec.cps, rlc_dec.rsb,
		rc);

	/* find TBF inst from given TFI */
	tbf = ul_tbf_by_tfi(rlc_dec.tfi);
	if (!tbf) {
		LOGP(DRLCMACUL, LOGL_NOTICE, "UL DATA unknown TFI=%d\n",
			rlc_dec.tfi);
		return 0;
	}

	return tbf->rcv_data_block_acknowledged(&rlc_dec, data, meas);
}

int gprs_rlcmac_pdch::rcv_block_gprs(uint8_t *data, uint32_t fn,
	struct pcu_l1_meas *meas, GprsCodingScheme cs)
{
	unsigned payload = data[0] >> 6;
	bitvec *block;
	int rc = 0;
	unsigned len = cs.maxBytesUL();

	switch (payload) {
	case GPRS_RLCMAC_DATA_BLOCK:
		rc = rcv_data_block(data, fn, meas, cs);
		break;
	case GPRS_RLCMAC_CONTROL_BLOCK:
		block = bitvec_alloc(len);
		if (!block)
			return -ENOMEM;
		bitvec_unpack(block, data);
		rc = rcv_control_block(block, fn);
		bitvec_free(block);
		break;
	case GPRS_RLCMAC_CONTROL_BLOCK_OPT:
		LOGP(DRLCMAC, LOGL_NOTICE, "GPRS_RLCMAC_CONTROL_BLOCK_OPT block payload is not supported.\n");
		break;
	default:
		LOGP(DRLCMAC, LOGL_NOTICE, "Unknown RLCMAC block payload(%u).\n", payload);
		rc = -EINVAL;
	}

	return rc;
}

gprs_rlcmac_tbf *gprs_rlcmac_pdch::tbf_from_list_by_tfi(
		LListHead<gprs_rlcmac_tbf> *tbf_list, uint8_t tfi,
		enum gprs_rlcmac_tbf_direction dir)
{
	gprs_rlcmac_tbf *tbf;
	LListHead<gprs_rlcmac_tbf> *pos;

	llist_for_each(pos, tbf_list) {
		tbf = pos->entry();
		if (tbf->tfi() != tfi)
			continue;
		if (!tbf->pdch[ts_no])
			continue;
		return tbf;
	}
	return NULL;
}

gprs_rlcmac_ul_tbf *gprs_rlcmac_pdch::ul_tbf_by_tfi(uint8_t tfi)
{
	return as_ul_tbf(tbf_by_tfi(tfi, GPRS_RLCMAC_UL_TBF));
}

gprs_rlcmac_dl_tbf *gprs_rlcmac_pdch::dl_tbf_by_tfi(uint8_t tfi)
{
	return as_dl_tbf(tbf_by_tfi(tfi, GPRS_RLCMAC_DL_TBF));
}

/* lookup TBF Entity (by TFI) */
gprs_rlcmac_tbf *gprs_rlcmac_pdch::tbf_by_tfi(uint8_t tfi,
	enum gprs_rlcmac_tbf_direction dir)
{
	struct gprs_rlcmac_tbf *tbf;

	if (tfi >= 32)
		return NULL;

	tbf = m_tbfs[dir][tfi];

	if (!tbf)
		return NULL;

	if (tbf->state_is_not(GPRS_RLCMAC_RELEASING)) {
		return tbf;
	}

	return NULL;
}

void gprs_rlcmac_pdch::attach_tbf(gprs_rlcmac_tbf *tbf)
{
	gprs_rlcmac_ul_tbf *ul_tbf;

	if (m_tbfs[tbf->direction][tbf->tfi()])
		LOGP(DRLCMAC, LOGL_ERROR, "PDCH(TS %d, TRX %d): "
			"%s has not been detached, overwriting it\n",
			ts_no, trx_no(),
			m_tbfs[tbf->direction][tbf->tfi()]->name());

	m_num_tbfs[tbf->direction] += 1;
	if (tbf->direction == GPRS_RLCMAC_UL_TBF) {
		ul_tbf = as_ul_tbf(tbf);
		m_assigned_usf |= 1 << ul_tbf->m_usf[ts_no];
	}
	m_assigned_tfi[tbf->direction] |= 1UL << tbf->tfi();
	m_tbfs[tbf->direction][tbf->tfi()] = tbf;

	LOGP(DRLCMAC, LOGL_INFO, "PDCH(TS %d, TRX %d): Attaching %s, %d TBFs, "
		"USFs = %02x, TFIs = %08x.\n",
		ts_no, trx_no(), tbf->name(), m_num_tbfs[tbf->direction],
		m_assigned_usf, m_assigned_tfi[tbf->direction]);
}

void gprs_rlcmac_pdch::detach_tbf(gprs_rlcmac_tbf *tbf)
{
	gprs_rlcmac_ul_tbf *ul_tbf;

	OSMO_ASSERT(m_num_tbfs[tbf->direction] > 0);

	m_num_tbfs[tbf->direction] -= 1;
	if (tbf->direction == GPRS_RLCMAC_UL_TBF) {
		ul_tbf = as_ul_tbf(tbf);
		m_assigned_usf &= ~(1 << ul_tbf->m_usf[ts_no]);
	}
	m_assigned_tfi[tbf->direction] &= ~(1UL << tbf->tfi());
	m_tbfs[tbf->direction][tbf->tfi()] = NULL;

	LOGP(DRLCMAC, LOGL_INFO, "PDCH(TS %d, TRX %d): Detaching %s, %d TBFs, "
		"USFs = %02x, TFIs = %08x.\n",
		ts_no, trx_no(), tbf->name(), m_num_tbfs[tbf->direction],
		m_assigned_usf, m_assigned_tfi[tbf->direction]);
}

void gprs_rlcmac_pdch::reserve(enum gprs_rlcmac_tbf_direction dir)
{
	m_num_reserved[dir] += 1;
}

void gprs_rlcmac_pdch::unreserve(enum gprs_rlcmac_tbf_direction dir)
{
	OSMO_ASSERT(m_num_reserved[dir] > 0);
	m_num_reserved[dir] -= 1;
}

void gprs_rlcmac_trx::reserve_slots(enum gprs_rlcmac_tbf_direction dir,
	uint8_t slots)
{
	unsigned i;
	for (i = 0; i < ARRAY_SIZE(pdch); i += 1)
		if (slots & (1 << i))
			pdch[i].reserve(dir);
}

void gprs_rlcmac_trx::unreserve_slots(enum gprs_rlcmac_tbf_direction dir,
	uint8_t slots)
{
	unsigned i;
	for (i = 0; i < ARRAY_SIZE(pdch); i += 1)
		if (slots & (1 << i))
			pdch[i].unreserve(dir);
}