summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/ath/ath9k/rc.c
blob: 70fdb9d8db82579193b8ed7e393ef9cc0a30cd7a (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
/*
 * Copyright (c) 2004 Video54 Technologies, Inc.
 * Copyright (c) 2004-2009 Atheros Communications, Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "ath9k.h"

static const struct ath_rate_table ar5416_11na_ratetable = {
	42,
	8, /* MCS start */
	{
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
			5400, 0, 12, 0, 0, 0, 0, 0 },
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
			7800,  1, 18, 0, 1, 1, 1, 1 },
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
			10000, 2, 24, 2, 2, 2, 2, 2 },
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
			13900, 3, 36, 2, 3, 3, 3, 3 },
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
			17300, 4, 48, 4, 4, 4, 4, 4 },
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
			23000, 5, 72, 4, 5, 5, 5, 5 },
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
			27400, 6, 96, 4, 6, 6, 6, 6 },
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
			29300, 7, 108, 4, 7, 7, 7, 7 },
		{ VALID_2040, VALID_2040, WLAN_RC_PHY_HT_20_SS, 6500, /* 6.5 Mb */
			6400, 0, 0, 0, 8, 24, 8, 24 },
		{ VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 13000, /* 13 Mb */
			12700, 1, 1, 2, 9, 25, 9, 25 },
		{ VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 19500, /* 19.5 Mb */
			18800, 2, 2, 2, 10, 26, 10, 26 },
		{ VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 26000, /* 26 Mb */
			25000, 3, 3, 4, 11, 27, 11, 27 },
		{ VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 39000, /* 39 Mb */
			36700, 4, 4, 4, 12, 28, 12, 28 },
		{ INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 52000, /* 52 Mb */
			48100, 5, 5, 4, 13, 29, 13, 29 },
		{ INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 58500, /* 58.5 Mb */
			53500, 6, 6, 4, 14, 30, 14, 30 },
		{ INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 65000, /* 65 Mb */
			59000, 7, 7, 4, 15, 31, 15, 32 },
		{ INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 13000, /* 13 Mb */
			12700, 8, 8, 3, 16, 33, 16, 33 },
		{ INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 26000, /* 26 Mb */
			24800, 9, 9, 2, 17, 34, 17, 34 },
		{ INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 39000, /* 39 Mb */
			36600, 10, 10, 2, 18, 35, 18, 35 },
		{ VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 52000, /* 52 Mb */
			48100, 11, 11, 4, 19, 36, 19, 36 },
		{ VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 78000, /* 78 Mb */
			69500, 12, 12, 4, 20, 37, 20, 37 },
		{ VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 104000, /* 104 Mb */
			89500, 13, 13, 4, 21, 38, 21, 38 },
		{ VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 117000, /* 117 Mb */
			98900, 14, 14, 4, 22, 39, 22, 39 },
		{ VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 130000, /* 130 Mb */
			108300, 15, 15, 4, 23, 40, 23, 41 },
		{ VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 13500, /* 13.5 Mb */
			13200, 0, 0, 0, 8, 24, 24, 24 },
		{ VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 27500, /* 27.0 Mb */
			25900, 1, 1, 2, 9, 25, 25, 25 },
		{ VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 40500, /* 40.5 Mb */
			38600, 2, 2, 2, 10, 26, 26, 26 },
		{ VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 54000, /* 54 Mb */
			49800, 3, 3, 4, 11, 27, 27, 27 },
		{ VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 81500, /* 81 Mb */
			72200, 4, 4, 4, 12, 28, 28, 28 },
		{ INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 108000, /* 108 Mb */
			92900, 5, 5, 4, 13, 29, 29, 29 },
		{ INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 121500, /* 121.5 Mb */
			102700, 6, 6, 4, 14, 30, 30, 30 },
		{ INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 135000, /* 135 Mb */
			112000, 7, 7, 4, 15, 31, 32, 32 },
		{ INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS_HGI, 150000, /* 150 Mb */
			122000, 7, 7, 4, 15, 31, 32, 32 },
		{ INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 27000, /* 27 Mb */
			25800, 8, 8, 0, 16, 33, 33, 33 },
		{ INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 54000, /* 54 Mb */
			49800, 9, 9, 2, 17, 34, 34, 34 },
		{ INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 81000, /* 81 Mb */
			71900, 10, 10, 2, 18, 35, 35, 35 },
		{ VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 108000, /* 108 Mb */
			92500, 11, 11, 4, 19, 36, 36, 36 },
		{ VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 162000, /* 162 Mb */
			130300, 12, 12, 4, 20, 37, 37, 37 },
		{ VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 216000, /* 216 Mb */
			162800, 13, 13, 4, 21, 38, 38, 38 },
		{ VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 243000, /* 243 Mb */
			178200, 14, 14, 4, 22, 39, 39, 39 },
		{ VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 270000, /* 270 Mb */
			192100, 15, 15, 4, 23, 40, 41, 41 },
		{ VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS_HGI, 300000, /* 300 Mb */
			207000, 15, 15, 4, 23, 40, 41, 41 },
	},
	50,  /* probe interval */
	WLAN_RC_HT_FLAG,  /* Phy rates allowed initially */
};

/* 4ms frame limit not used for NG mode.  The values filled
 * for HT are the 64K max aggregate limit */

static const struct ath_rate_table ar5416_11ng_ratetable = {
	46,
	12, /* MCS start */
	{
		{ VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 1000, /* 1 Mb */
			900, 0, 2, 0, 0, 0, 0, 0 },
		{ VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 2000, /* 2 Mb */
			1900, 1, 4, 1, 1, 1, 1, 1 },
		{ VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 5500, /* 5.5 Mb */
			4900, 2, 11, 2, 2, 2, 2, 2 },
		{ VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 11000, /* 11 Mb */
			8100, 3, 22, 3, 3, 3, 3, 3 },
		{ INVALID, INVALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
			5400, 4, 12, 4, 4, 4, 4, 4 },
		{ INVALID, INVALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
			7800, 5, 18, 4, 5, 5, 5, 5 },
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
			10100, 6, 24, 6, 6, 6, 6, 6 },
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
			14100, 7, 36, 6, 7, 7, 7, 7 },
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
			17700, 8, 48, 8, 8, 8, 8, 8 },
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
			23700, 9, 72, 8, 9, 9, 9, 9 },
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
			27400, 10, 96, 8, 10, 10, 10, 10 },
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
			30900, 11, 108, 8, 11, 11, 11, 11 },
		{ INVALID, INVALID, WLAN_RC_PHY_HT_20_SS, 6500, /* 6.5 Mb */
			6400, 0, 0, 4, 12, 28, 12, 28 },
		{ VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 13000, /* 13 Mb */
			12700, 1, 1, 6, 13, 29, 13, 29 },
		{ VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 19500, /* 19.5 Mb */
			18800, 2, 2, 6, 14, 30, 14, 30 },
		{ VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 26000, /* 26 Mb */
			25000, 3, 3, 8, 15, 31, 15, 31 },
		{ VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 39000, /* 39 Mb */
			36700, 4, 4, 8, 16, 32, 16, 32 },
		{ INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 52000, /* 52 Mb */
			48100, 5, 5, 8, 17, 33, 17, 33 },
		{ INVALID,  VALID_20, WLAN_RC_PHY_HT_20_SS, 58500, /* 58.5 Mb */
			53500, 6, 6, 8, 18, 34, 18, 34 },
		{ INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 65000, /* 65 Mb */
			59000, 7, 7, 8, 19, 35, 19, 36 },
		{ INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 13000, /* 13 Mb */
			12700, 8, 8, 4, 20, 37, 20, 37 },
		{ INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 26000, /* 26 Mb */
			24800, 9, 9, 6, 21, 38, 21, 38 },
		{ INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 39000, /* 39 Mb */
			36600, 10, 10, 6, 22, 39, 22, 39 },
		{ VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 52000, /* 52 Mb */
			48100, 11, 11, 8, 23, 40, 23, 40 },
		{ VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 78000, /* 78 Mb */
			69500, 12, 12, 8, 24, 41, 24, 41 },
		{ VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 104000, /* 104 Mb */
			89500, 13, 13, 8, 25, 42, 25, 42 },
		{ VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 117000, /* 117 Mb */
			98900, 14, 14, 8, 26, 43, 26, 44 },
		{ VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 130000, /* 130 Mb */
			108300, 15, 15, 8, 27, 44, 27, 45 },
		{ VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 13500, /* 13.5 Mb */
			13200, 0, 0, 8, 12, 28, 28, 28 },
		{ VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 27500, /* 27.0 Mb */
			25900, 1, 1, 8, 13, 29, 29, 29 },
		{ VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 40500, /* 40.5 Mb */
			38600, 2, 2, 8, 14, 30, 30, 30 },
		{ VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 54000, /* 54 Mb */
			49800, 3, 3, 8,  15, 31, 31, 31 },
		{ VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 81500, /* 81 Mb */
			72200, 4, 4, 8, 16, 32, 32, 32 },
		{ INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 108000, /* 108 Mb */
			92900, 5, 5, 8, 17, 33, 33, 33 },
		{ INVALID,  VALID_40, WLAN_RC_PHY_HT_40_SS, 121500, /* 121.5 Mb */
			102700, 6, 6, 8, 18, 34, 34, 34 },
		{ INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 135000, /* 135 Mb */
			112000, 7, 7, 8, 19, 35, 36, 36 },
		{ INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS_HGI, 150000, /* 150 Mb */
			122000, 7, 7, 8, 19, 35, 36, 36 },
		{ INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 27000, /* 27 Mb */
			25800, 8, 8, 8, 20, 37, 37, 37 },
		{ INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 54000, /* 54 Mb */
			49800, 9, 9, 8, 21, 38, 38, 38 },
		{ INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 81000, /* 81 Mb */
			71900, 10, 10, 8, 22, 39, 39, 39 },
		{ VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 108000, /* 108 Mb */
			92500, 11, 11, 8, 23, 40, 40, 40 },
		{ VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 162000, /* 162 Mb */
			130300, 12, 12, 8, 24, 41, 41, 41 },
		{ VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 216000, /* 216 Mb */
			162800, 13, 13, 8, 25, 42, 42, 42 },
		{ VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 243000, /* 243 Mb */
			178200, 14, 14, 8, 26, 43, 43, 43 },
		{ VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 270000, /* 270 Mb */
			192100, 15, 15, 8, 27, 44, 45, 45 },
		{ VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS_HGI, 300000, /* 300 Mb */
			207000, 15, 15, 8, 27, 44, 45, 45 },
	},
	50,  /* probe interval */
	WLAN_RC_HT_FLAG,  /* Phy rates allowed initially */
};

static const struct ath_rate_table ar5416_11a_ratetable = {
	8,
	0,
	{
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
			5400, 0, 12, 0, 0, 0 },
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
			7800,  1, 18, 0, 1, 0 },
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
			10000, 2, 24, 2, 2, 0 },
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
			13900, 3, 36, 2, 3, 0 },
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
			17300, 4, 48, 4, 4, 0 },
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
			23000, 5, 72, 4, 5, 0 },
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
			27400, 6, 96, 4, 6, 0 },
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
			29300, 7, 108, 4, 7, 0 },
	},
	50,  /* probe interval */
	0,   /* Phy rates allowed initially */
};

static const struct ath_rate_table ar5416_11g_ratetable = {
	12,
	0,
	{
		{ VALID, VALID, WLAN_RC_PHY_CCK, 1000, /* 1 Mb */
			900, 0, 2, 0, 0, 0 },
		{ VALID, VALID, WLAN_RC_PHY_CCK, 2000, /* 2 Mb */
			1900, 1, 4, 1, 1, 0 },
		{ VALID, VALID, WLAN_RC_PHY_CCK, 5500, /* 5.5 Mb */
			4900, 2, 11, 2, 2, 0 },
		{ VALID, VALID, WLAN_RC_PHY_CCK, 11000, /* 11 Mb */
			8100, 3, 22, 3, 3, 0 },
		{ INVALID, INVALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
			5400, 4, 12, 4, 4, 0 },
		{ INVALID, INVALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
			7800, 5, 18, 4, 5, 0 },
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
			10000, 6, 24, 6, 6, 0 },
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
			13900, 7, 36, 6, 7, 0 },
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
			17300, 8, 48, 8, 8, 0 },
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
			23000, 9, 72, 8, 9, 0 },
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
			27400, 10, 96, 8, 10, 0 },
		{ VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
			29300, 11, 108, 8, 11, 0 },
	},
	50,  /* probe interval */
	0,   /* Phy rates allowed initially */
};

static const struct ath_rate_table *hw_rate_table[ATH9K_MODE_MAX] = {
	[ATH9K_MODE_11A] = &ar5416_11a_ratetable,
	[ATH9K_MODE_11G] = &ar5416_11g_ratetable,
	[ATH9K_MODE_11NA_HT20] = &ar5416_11na_ratetable,
	[ATH9K_MODE_11NG_HT20] = &ar5416_11ng_ratetable,
	[ATH9K_MODE_11NA_HT40PLUS] = &ar5416_11na_ratetable,
	[ATH9K_MODE_11NA_HT40MINUS] = &ar5416_11na_ratetable,
	[ATH9K_MODE_11NG_HT40PLUS] = &ar5416_11ng_ratetable,
	[ATH9K_MODE_11NG_HT40MINUS] = &ar5416_11ng_ratetable,
};

static int ath_rc_get_rateindex(const struct ath_rate_table *rate_table,
				struct ieee80211_tx_rate *rate);

static inline int8_t median(int8_t a, int8_t b, int8_t c)
{
	if (a >= b) {
		if (b >= c)
			return b;
		else if (a > c)
			return c;
		else
			return a;
	} else {
		if (a >= c)
			return a;
		else if (b >= c)
			return c;
		else
			return b;
	}
}

static void ath_rc_sort_validrates(const struct ath_rate_table *rate_table,
				   struct ath_rate_priv *ath_rc_priv)
{
	u8 i, j, idx, idx_next;

	for (i = ath_rc_priv->max_valid_rate - 1; i > 0; i--) {
		for (j = 0; j <= i-1; j++) {
			idx = ath_rc_priv->valid_rate_index[j];
			idx_next = ath_rc_priv->valid_rate_index[j+1];

			if (rate_table->info[idx].ratekbps >
				rate_table->info[idx_next].ratekbps) {
				ath_rc_priv->valid_rate_index[j] = idx_next;
				ath_rc_priv->valid_rate_index[j+1] = idx;
			}
		}
	}
}

static void ath_rc_init_valid_txmask(struct ath_rate_priv *ath_rc_priv)
{
	u8 i;

	for (i = 0; i < ath_rc_priv->rate_table_size; i++)
		ath_rc_priv->valid_rate_index[i] = 0;
}

static inline void ath_rc_set_valid_txmask(struct ath_rate_priv *ath_rc_priv,
					   u8 index, int valid_tx_rate)
{
	BUG_ON(index > ath_rc_priv->rate_table_size);
	ath_rc_priv->valid_rate_index[index] = valid_tx_rate ? 1 : 0;
}

static inline
int ath_rc_get_nextvalid_txrate(const struct ath_rate_table *rate_table,
				struct ath_rate_priv *ath_rc_priv,
				u8 cur_valid_txrate,
				u8 *next_idx)
{
	u8 i;

	for (i = 0; i < ath_rc_priv->max_valid_rate - 1; i++) {
		if (ath_rc_priv->valid_rate_index[i] == cur_valid_txrate) {
			*next_idx = ath_rc_priv->valid_rate_index[i+1];
			return 1;
		}
	}

	/* No more valid rates */
	*next_idx = 0;

	return 0;
}

/* Return true only for single stream */

static int ath_rc_valid_phyrate(u32 phy, u32 capflag, int ignore_cw)
{
	if (WLAN_RC_PHY_HT(phy) && !(capflag & WLAN_RC_HT_FLAG))
		return 0;
	if (WLAN_RC_PHY_DS(phy) && !(capflag & WLAN_RC_DS_FLAG))
		return 0;
	if (WLAN_RC_PHY_SGI(phy) && !(capflag & WLAN_RC_SGI_FLAG))
		return 0;
	if (!ignore_cw && WLAN_RC_PHY_HT(phy))
		if (WLAN_RC_PHY_40(phy) && !(capflag & WLAN_RC_40_FLAG))
			return 0;
	return 1;
}

static inline int
ath_rc_get_lower_rix(const struct ath_rate_table *rate_table,
		     struct ath_rate_priv *ath_rc_priv,
		     u8 cur_valid_txrate, u8 *next_idx)
{
	int8_t i;

	for (i = 1; i < ath_rc_priv->max_valid_rate ; i++) {
		if (ath_rc_priv->valid_rate_index[i] == cur_valid_txrate) {
			*next_idx = ath_rc_priv->valid_rate_index[i-1];
			return 1;
		}
	}

	return 0;
}

static u8 ath_rc_init_validrates(struct ath_rate_priv *ath_rc_priv,
				 const struct ath_rate_table *rate_table,
				 u32 capflag)
{
	u8 i, hi = 0;
	u32 valid;

	for (i = 0; i < rate_table->rate_cnt; i++) {
		valid = (!(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG) ?
			 rate_table->info[i].valid_single_stream :
			 rate_table->info[i].valid);
		if (valid == 1) {
			u32 phy = rate_table->info[i].phy;
			u8 valid_rate_count = 0;

			if (!ath_rc_valid_phyrate(phy, capflag, 0))
				continue;

			valid_rate_count = ath_rc_priv->valid_phy_ratecnt[phy];

			ath_rc_priv->valid_phy_rateidx[phy][valid_rate_count] = i;
			ath_rc_priv->valid_phy_ratecnt[phy] += 1;
			ath_rc_set_valid_txmask(ath_rc_priv, i, 1);
			hi = A_MAX(hi, i);
		}
	}

	return hi;
}

static u8 ath_rc_setvalid_rates(struct ath_rate_priv *ath_rc_priv,
				const struct ath_rate_table *rate_table,
				struct ath_rateset *rateset,
				u32 capflag)
{
	u8 i, j, hi = 0;

	/* Use intersection of working rates and valid rates */
	for (i = 0; i < rateset->rs_nrates; i++) {
		for (j = 0; j < rate_table->rate_cnt; j++) {
			u32 phy = rate_table->info[j].phy;
			u32 valid = (!(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG) ?
				     rate_table->info[j].valid_single_stream :
				     rate_table->info[j].valid);
			u8 rate = rateset->rs_rates[i];
			u8 dot11rate = rate_table->info[j].dot11rate;

			/* We allow a rate only if its valid and the
			 * capflag matches one of the validity
			 * (VALID/VALID_20/VALID_40) flags */

			if ((rate == dot11rate) &&
			    ((valid & WLAN_RC_CAP_MODE(capflag)) ==
			     WLAN_RC_CAP_MODE(capflag)) &&
			    !WLAN_RC_PHY_HT(phy)) {
				u8 valid_rate_count = 0;

				if (!ath_rc_valid_phyrate(phy, capflag, 0))
					continue;

				valid_rate_count =
					ath_rc_priv->valid_phy_ratecnt[phy];

				ath_rc_priv->valid_phy_rateidx[phy]
					[valid_rate_count] = j;
				ath_rc_priv->valid_phy_ratecnt[phy] += 1;
				ath_rc_set_valid_txmask(ath_rc_priv, j, 1);
				hi = A_MAX(hi, j);
			}
		}
	}

	return hi;
}

static u8 ath_rc_setvalid_htrates(struct ath_rate_priv *ath_rc_priv,
				  const struct ath_rate_table *rate_table,
				  u8 *mcs_set, u32 capflag)
{
	struct ath_rateset *rateset = (struct ath_rateset *)mcs_set;

	u8 i, j, hi = 0;

	/* Use intersection of working rates and valid rates */
	for (i = 0; i < rateset->rs_nrates; i++) {
		for (j = 0; j < rate_table->rate_cnt; j++) {
			u32 phy = rate_table->info[j].phy;
			u32 valid = (!(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG) ?
				     rate_table->info[j].valid_single_stream :
				     rate_table->info[j].valid);
			u8 rate = rateset->rs_rates[i];
			u8 dot11rate = rate_table->info[j].dot11rate;

			if ((rate != dot11rate) || !WLAN_RC_PHY_HT(phy) ||
			    !WLAN_RC_PHY_HT_VALID(valid, capflag))
				continue;

			if (!ath_rc_valid_phyrate(phy, capflag, 0))
				continue;

			ath_rc_priv->valid_phy_rateidx[phy]
				[ath_rc_priv->valid_phy_ratecnt[phy]] = j;
			ath_rc_priv->valid_phy_ratecnt[phy] += 1;
			ath_rc_set_valid_txmask(ath_rc_priv, j, 1);
			hi = A_MAX(hi, j);
		}
	}

	return hi;
}

/* Finds the highest rate index we can use */
static u8 ath_rc_get_highest_rix(struct ath_softc *sc,
			         struct ath_rate_priv *ath_rc_priv,
				 const struct ath_rate_table *rate_table,
				 int *is_probing)
{
	u32 best_thruput, this_thruput, now_msec;
	u8 rate, next_rate, best_rate, maxindex, minindex;
	int8_t index = 0;

	now_msec = jiffies_to_msecs(jiffies);
	*is_probing = 0;
	best_thruput = 0;
	maxindex = ath_rc_priv->max_valid_rate-1;
	minindex = 0;
	best_rate = minindex;

	/*
	 * Try the higher rate first. It will reduce memory moving time
	 * if we have very good channel characteristics.
	 */
	for (index = maxindex; index >= minindex ; index--) {
		u8 per_thres;

		rate = ath_rc_priv->valid_rate_index[index];
		if (rate > ath_rc_priv->rate_max_phy)
			continue;

		/*
		 * For TCP the average collision rate is around 11%,
		 * so we ignore PERs less than this.  This is to
		 * prevent the rate we are currently using (whose
		 * PER might be in the 10-15 range because of TCP
		 * collisions) looking worse than the next lower
		 * rate whose PER has decayed close to 0.  If we
		 * used to next lower rate, its PER would grow to
		 * 10-15 and we would be worse off then staying
		 * at the current rate.
		 */
		per_thres = ath_rc_priv->per[rate];
		if (per_thres < 12)
			per_thres = 12;

		this_thruput = rate_table->info[rate].user_ratekbps *
			(100 - per_thres);

		if (best_thruput <= this_thruput) {
			best_thruput = this_thruput;
			best_rate    = rate;
		}
	}

	rate = best_rate;

	/*
	 * Must check the actual rate (ratekbps) to account for
	 * non-monoticity of 11g's rate table
	 */

	if (rate >= ath_rc_priv->rate_max_phy) {
		rate = ath_rc_priv->rate_max_phy;

		/* Probe the next allowed phy state */
		if (ath_rc_get_nextvalid_txrate(rate_table,
					ath_rc_priv, rate, &next_rate) &&
		    (now_msec - ath_rc_priv->probe_time >
		     rate_table->probe_interval) &&
		    (ath_rc_priv->hw_maxretry_pktcnt >= 1)) {
			rate = next_rate;
			ath_rc_priv->probe_rate = rate;
			ath_rc_priv->probe_time = now_msec;
			ath_rc_priv->hw_maxretry_pktcnt = 0;
			*is_probing = 1;
		}
	}

	if (rate > (ath_rc_priv->rate_table_size - 1))
		rate = ath_rc_priv->rate_table_size - 1;

	if (rate_table->info[rate].valid &&
	    (ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG))
		return rate;

	if (rate_table->info[rate].valid_single_stream &&
	    !(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG))
		return rate;

	/* This should not happen */
	WARN_ON(1);

	rate = ath_rc_priv->valid_rate_index[0];

	return rate;
}

static void ath_rc_rate_set_series(const struct ath_rate_table *rate_table,
				   struct ieee80211_tx_rate *rate,
				   struct ieee80211_tx_rate_control *txrc,
				   u8 tries, u8 rix, int rtsctsenable)
{
	rate->count = tries;
	rate->idx = rate_table->info[rix].ratecode;

	if (txrc->short_preamble)
		rate->flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
	if (txrc->rts || rtsctsenable)
		rate->flags |= IEEE80211_TX_RC_USE_RTS_CTS;

	if (WLAN_RC_PHY_HT(rate_table->info[rix].phy)) {
		rate->flags |= IEEE80211_TX_RC_MCS;
		if (WLAN_RC_PHY_40(rate_table->info[rix].phy))
			rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
		if (WLAN_RC_PHY_SGI(rate_table->info[rix].phy))
			rate->flags |= IEEE80211_TX_RC_SHORT_GI;
	}
}

static void ath_rc_rate_set_rtscts(struct ath_softc *sc,
				   const struct ath_rate_table *rate_table,
				   struct ieee80211_tx_info *tx_info)
{
	struct ieee80211_tx_rate *rates = tx_info->control.rates;
	int i = 0, rix = 0, cix, enable_g_protection = 0;

	/* get the cix for the lowest valid rix */
	for (i = 3; i >= 0; i--) {
		if (rates[i].count && (rates[i].idx >= 0)) {
			rix = ath_rc_get_rateindex(rate_table, &rates[i]);
			break;
		}
	}
	cix = rate_table->info[rix].ctrl_rate;

	/* All protection frames are transmited at 2Mb/s for 802.11g,
	 * otherwise we transmit them at 1Mb/s */
	if (sc->hw->conf.channel->band == IEEE80211_BAND_2GHZ &&
	    !conf_is_ht(&sc->hw->conf))
		enable_g_protection = 1;

	/*
	 * If 802.11g protection is enabled, determine whether to use RTS/CTS or
	 * just CTS.  Note that this is only done for OFDM/HT unicast frames.
	 */
	if ((sc->sc_flags & SC_OP_PROTECT_ENABLE) &&
	    (rate_table->info[rix].phy == WLAN_RC_PHY_OFDM ||
	     WLAN_RC_PHY_HT(rate_table->info[rix].phy))) {
		rates[0].flags |= IEEE80211_TX_RC_USE_CTS_PROTECT;
		cix = rate_table->info[enable_g_protection].ctrl_rate;
	}

	tx_info->control.rts_cts_rate_idx = cix;
}

static void ath_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta,
			 struct ieee80211_tx_rate_control *txrc)
{
	struct ath_softc *sc = priv;
	struct ath_rate_priv *ath_rc_priv = priv_sta;
	const struct ath_rate_table *rate_table;
	struct sk_buff *skb = txrc->skb;
	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
	struct ieee80211_tx_rate *rates = tx_info->control.rates;
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	__le16 fc = hdr->frame_control;
	u8 try_per_rate, i = 0, rix, nrix;
	int is_probe = 0;

	if (rate_control_send_low(sta, priv_sta, txrc))
		return;

	/*
	 * For Multi Rate Retry we use a different number of
	 * retry attempt counts. This ends up looking like this:
	 *
	 * MRR[0] = 2
	 * MRR[1] = 2
	 * MRR[2] = 2
	 * MRR[3] = 4
	 *
	 */
	try_per_rate = sc->hw->max_rate_tries;

	rate_table = sc->cur_rate_table;
	rix = ath_rc_get_highest_rix(sc, ath_rc_priv, rate_table, &is_probe);
	nrix = rix;

	if (is_probe) {
		/* set one try for probe rates. For the
		 * probes don't enable rts */
		ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
				       1, nrix, 0);

		/* Get the next tried/allowed rate. No RTS for the next series
		 * after the probe rate
		 */
		ath_rc_get_lower_rix(rate_table, ath_rc_priv, rix, &nrix);
		ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
				       try_per_rate, nrix, 0);

		tx_info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
	} else {
		/* Set the choosen rate. No RTS for first series entry. */
		ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
				       try_per_rate, nrix, 0);
	}

	/* Fill in the other rates for multirate retry */
	for ( ; i < 4; i++) {
		/* Use twice the number of tries for the last MRR segment. */
		if (i + 1 == 4)
			try_per_rate = 4;

		ath_rc_get_lower_rix(rate_table, ath_rc_priv, rix, &nrix);
		/* All other rates in the series have RTS enabled */
		ath_rc_rate_set_series(rate_table, &rates[i], txrc,
				       try_per_rate, nrix, 1);
	}

	/*
	 * NB:Change rate series to enable aggregation when operating
	 * at lower MCS rates. When first rate in series is MCS2
	 * in HT40 @ 2.4GHz, series should look like:
	 *
	 * {MCS2, MCS1, MCS0, MCS0}.
	 *
	 * When first rate in series is MCS3 in HT20 @ 2.4GHz, series should
	 * look like:
	 *
	 * {MCS3, MCS2, MCS1, MCS1}
	 *
	 * So, set fourth rate in series to be same as third one for
	 * above conditions.
	 */
	if ((sc->hw->conf.channel->band == IEEE80211_BAND_2GHZ) &&
	    (conf_is_ht(&sc->hw->conf))) {
		u8 dot11rate = rate_table->info[rix].dot11rate;
		u8 phy = rate_table->info[rix].phy;
		if (i == 4 &&
		    ((dot11rate == 2 && phy == WLAN_RC_PHY_HT_40_SS) ||
		     (dot11rate == 3 && phy == WLAN_RC_PHY_HT_20_SS))) {
			rates[3].idx = rates[2].idx;
			rates[3].flags = rates[2].flags;
		}
	}

	/*
	 * Force hardware to use computed duration for next
	 * fragment by disabling multi-rate retry, which
	 * updates duration based on the multi-rate duration table.
	 *
	 * FIXME: Fix duration
	 */
	if (ieee80211_has_morefrags(fc) ||
	    (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG)) {
		rates[1].count = rates[2].count = rates[3].count = 0;
		rates[1].idx = rates[2].idx = rates[3].idx = 0;
		rates[0].count = ATH_TXMAXTRY;
	}

	/* Setup RTS/CTS */
	ath_rc_rate_set_rtscts(sc, rate_table, tx_info);
}

static bool ath_rc_update_per(struct ath_softc *sc,
			      const struct ath_rate_table *rate_table,
			      struct ath_rate_priv *ath_rc_priv,
				  struct ieee80211_tx_info *tx_info,
			      int tx_rate, int xretries, int retries,
			      u32 now_msec)
{
	bool state_change = false;
	int count, n_bad_frames;
	u8 last_per;
	static u32 nretry_to_per_lookup[10] = {
		100 * 0 / 1,
		100 * 1 / 4,
		100 * 1 / 2,
		100 * 3 / 4,
		100 * 4 / 5,
		100 * 5 / 6,
		100 * 6 / 7,
		100 * 7 / 8,
		100 * 8 / 9,
		100 * 9 / 10
	};

	last_per = ath_rc_priv->per[tx_rate];
	n_bad_frames = tx_info->status.ampdu_len - tx_info->status.ampdu_ack_len;

	if (xretries) {
		if (xretries == 1) {
			ath_rc_priv->per[tx_rate] += 30;
			if (ath_rc_priv->per[tx_rate] > 100)
				ath_rc_priv->per[tx_rate] = 100;
		} else {
			/* xretries == 2 */
			count = ARRAY_SIZE(nretry_to_per_lookup);
			if (retries >= count)
				retries = count - 1;

			/* new_PER = 7/8*old_PER + 1/8*(currentPER) */
			ath_rc_priv->per[tx_rate] =
				(u8)(last_per - (last_per >> 3) + (100 >> 3));
		}

		/* xretries == 1 or 2 */

		if (ath_rc_priv->probe_rate == tx_rate)
			ath_rc_priv->probe_rate = 0;

	} else { /* xretries == 0 */
		count = ARRAY_SIZE(nretry_to_per_lookup);
		if (retries >= count)
			retries = count - 1;

		if (n_bad_frames) {
			/* new_PER = 7/8*old_PER + 1/8*(currentPER)
			 * Assuming that n_frames is not 0.  The current PER
			 * from the retries is 100 * retries / (retries+1),
			 * since the first retries attempts failed, and the
			 * next one worked.  For the one that worked,
			 * n_bad_frames subframes out of n_frames wored,
			 * so the PER for that part is
			 * 100 * n_bad_frames / n_frames, and it contributes
			 * 100 * n_bad_frames / (n_frames * (retries+1)) to
			 * the above PER.  The expression below is a
			 * simplified version of the sum of these two terms.
			 */
			if (tx_info->status.ampdu_len > 0) {
				int n_frames, n_bad_tries;
				u8 cur_per, new_per;

				n_bad_tries = retries * tx_info->status.ampdu_len +
					n_bad_frames;
				n_frames = tx_info->status.ampdu_len * (retries + 1);
				cur_per = (100 * n_bad_tries / n_frames) >> 3;
				new_per = (u8)(last_per - (last_per >> 3) + cur_per);
				ath_rc_priv->per[tx_rate] = new_per;
			}
		} else {
			ath_rc_priv->per[tx_rate] =
				(u8)(last_per - (last_per >> 3) +
				     (nretry_to_per_lookup[retries] >> 3));
		}


		/*
		 * If we got at most one retry then increase the max rate if
		 * this was a probe.  Otherwise, ignore the probe.
		 */
		if (ath_rc_priv->probe_rate && ath_rc_priv->probe_rate == tx_rate) {
			if (retries > 0 || 2 * n_bad_frames > tx_info->status.ampdu_len) {
				/*
				 * Since we probed with just a single attempt,
				 * any retries means the probe failed.  Also,
				 * if the attempt worked, but more than half
				 * the subframes were bad then also consider
				 * the probe a failure.
				 */
				ath_rc_priv->probe_rate = 0;
			} else {
				u8 probe_rate = 0;

				ath_rc_priv->rate_max_phy =
					ath_rc_priv->probe_rate;
				probe_rate = ath_rc_priv->probe_rate;

				if (ath_rc_priv->per[probe_rate] > 30)
					ath_rc_priv->per[probe_rate] = 20;

				ath_rc_priv->probe_rate = 0;

				/*
				 * Since this probe succeeded, we allow the next
				 * probe twice as soon.  This allows the maxRate
				 * to move up faster if the probes are
				 * successful.
				 */
				ath_rc_priv->probe_time =
					now_msec - rate_table->probe_interval / 2;
			}
		}

		if (retries > 0) {
			/*
			 * Don't update anything.  We don't know if
			 * this was because of collisions or poor signal.
			 */
			ath_rc_priv->hw_maxretry_pktcnt = 0;
		} else {
			/*
			 * It worked with no retries. First ignore bogus (small)
			 * rssi_ack values.
			 */
			if (tx_rate == ath_rc_priv->rate_max_phy &&
			    ath_rc_priv->hw_maxretry_pktcnt < 255) {
				ath_rc_priv->hw_maxretry_pktcnt++;
			}

		}
	}

	return state_change;
}

/* Update PER, RSSI and whatever else that the code thinks it is doing.
   If you can make sense of all this, you really need to go out more. */

static void ath_rc_update_ht(struct ath_softc *sc,
			     struct ath_rate_priv *ath_rc_priv,
			     struct ieee80211_tx_info *tx_info,
			     int tx_rate, int xretries, int retries)
{
	u32 now_msec = jiffies_to_msecs(jiffies);
	int rate;
	u8 last_per;
	bool state_change = false;
	const struct ath_rate_table *rate_table = sc->cur_rate_table;
	int size = ath_rc_priv->rate_table_size;

	if ((tx_rate < 0) || (tx_rate > rate_table->rate_cnt))
		return;

	last_per = ath_rc_priv->per[tx_rate];

	/* Update PER first */
	state_change = ath_rc_update_per(sc, rate_table, ath_rc_priv,
					 tx_info, tx_rate, xretries,
					 retries, now_msec);

	/*
	 * If this rate looks bad (high PER) then stop using it for
	 * a while (except if we are probing).
	 */
	if (ath_rc_priv->per[tx_rate] >= 55 && tx_rate > 0 &&
	    rate_table->info[tx_rate].ratekbps <=
	    rate_table->info[ath_rc_priv->rate_max_phy].ratekbps) {
		ath_rc_get_lower_rix(rate_table, ath_rc_priv,
				     (u8)tx_rate, &ath_rc_priv->rate_max_phy);

		/* Don't probe for a little while. */
		ath_rc_priv->probe_time = now_msec;
	}

	/* Make sure the rates below this have lower PER */
	/* Monotonicity is kept only for rates below the current rate. */
	if (ath_rc_priv->per[tx_rate] < last_per) {
		for (rate = tx_rate - 1; rate >= 0; rate--) {

			if (ath_rc_priv->per[rate] >
			    ath_rc_priv->per[rate+1]) {
				ath_rc_priv->per[rate] =
					ath_rc_priv->per[rate+1];
			}
		}
	}

	/* Maintain monotonicity for rates above the current rate */
	for (rate = tx_rate; rate < size - 1; rate++) {
		if (ath_rc_priv->per[rate+1] <
		    ath_rc_priv->per[rate])
			ath_rc_priv->per[rate+1] =
				ath_rc_priv->per[rate];
	}

	/* Every so often, we reduce the thresholds
	 * and PER (different for CCK and OFDM). */
	if (now_msec - ath_rc_priv->per_down_time >=
	    rate_table->probe_interval) {
		for (rate = 0; rate < size; rate++) {
			ath_rc_priv->per[rate] =
				7 * ath_rc_priv->per[rate] / 8;
		}

		ath_rc_priv->per_down_time = now_msec;
	}

	ath_debug_stat_retries(sc, tx_rate, xretries, retries,
			       ath_rc_priv->per[tx_rate]);

}

static int ath_rc_get_rateindex(const struct ath_rate_table *rate_table,
				struct ieee80211_tx_rate *rate)
{
	int rix;

	if (!(rate->flags & IEEE80211_TX_RC_MCS))
		return rate->idx;

	rix = rate->idx + rate_table->mcs_start;
	if ((rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) &&
	    (rate->flags & IEEE80211_TX_RC_SHORT_GI))
		rix = rate_table->info[rix].ht_index;
	else if (rate->flags & IEEE80211_TX_RC_SHORT_GI)
		rix = rate_table->info[rix].sgi_index;
	else if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
		rix = rate_table->info[rix].cw40index;
	else
		rix = rate_table->info[rix].base_index;

	return rix;
}

static void ath_rc_tx_status(struct ath_softc *sc,
			     struct ath_rate_priv *ath_rc_priv,
			     struct ieee80211_tx_info *tx_info,
			     int final_ts_idx, int xretries, int long_retry)
{
	const struct ath_rate_table *rate_table;
	struct ieee80211_tx_rate *rates = tx_info->status.rates;
	u8 flags;
	u32 i = 0, rix;

	rate_table = sc->cur_rate_table;

	/*
	 * If the first rate is not the final index, there
	 * are intermediate rate failures to be processed.
	 */
	if (final_ts_idx != 0) {
		/* Process intermediate rates that failed.*/
		for (i = 0; i < final_ts_idx ; i++) {
			if (rates[i].count != 0 && (rates[i].idx >= 0)) {
				flags = rates[i].flags;

				/* If HT40 and we have switched mode from
				 * 40 to 20 => don't update */

				if ((flags & IEEE80211_TX_RC_40_MHZ_WIDTH) &&
				    !(ath_rc_priv->ht_cap & WLAN_RC_40_FLAG))
					return;

				rix = ath_rc_get_rateindex(rate_table, &rates[i]);
				ath_rc_update_ht(sc, ath_rc_priv, tx_info,
						rix, xretries ? 1 : 2,
						rates[i].count);
			}
		}
	} else {
		/*
		 * Handle the special case of MIMO PS burst, where the second
		 * aggregate is sent out with only one rate and one try.
		 * Treating it as an excessive retry penalizes the rate
		 * inordinately.
		 */
		if (rates[0].count == 1 && xretries == 1)
			xretries = 2;
	}

	flags = rates[i].flags;

	/* If HT40 and we have switched mode from 40 to 20 => don't update */
	if ((flags & IEEE80211_TX_RC_40_MHZ_WIDTH) &&
	    !(ath_rc_priv->ht_cap & WLAN_RC_40_FLAG))
		return;

	rix = ath_rc_get_rateindex(rate_table, &rates[i]);
	ath_rc_update_ht(sc, ath_rc_priv, tx_info, rix, xretries, long_retry);
}

static const
struct ath_rate_table *ath_choose_rate_table(struct ath_softc *sc,
					     enum ieee80211_band band,
					     bool is_ht,
					     bool is_cw_40)
{
	int mode = 0;
	struct ath_common *common = ath9k_hw_common(sc->sc_ah);

	switch(band) {
	case IEEE80211_BAND_2GHZ:
		mode = ATH9K_MODE_11G;
		if (is_ht)
			mode = ATH9K_MODE_11NG_HT20;
		if (is_cw_40)
			mode = ATH9K_MODE_11NG_HT40PLUS;
		break;
	case IEEE80211_BAND_5GHZ:
		mode = ATH9K_MODE_11A;
		if (is_ht)
			mode = ATH9K_MODE_11NA_HT20;
		if (is_cw_40)
			mode = ATH9K_MODE_11NA_HT40PLUS;
		break;
	default:
		ath_print(common, ATH_DBG_CONFIG, "Invalid band\n");
		return NULL;
	}

	BUG_ON(mode >= ATH9K_MODE_MAX);

	ath_print(common, ATH_DBG_CONFIG,
		  "Choosing rate table for mode: %d\n", mode);

	sc->cur_rate_mode = mode;
	return hw_rate_table[mode];
}

static void ath_rc_init(struct ath_softc *sc,
			struct ath_rate_priv *ath_rc_priv,
			struct ieee80211_supported_band *sband,
			struct ieee80211_sta *sta,
			const struct ath_rate_table *rate_table)
{
	struct ath_rateset *rateset = &ath_rc_priv->neg_rates;
	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
	u8 *ht_mcs = (u8 *)&ath_rc_priv->neg_ht_rates;
	u8 i, j, k, hi = 0, hthi = 0;

	/* Initial rate table size. Will change depending
	 * on the working rate set */
	ath_rc_priv->rate_table_size = RATE_TABLE_SIZE;

	/* Initialize thresholds according to the global rate table */
	for (i = 0 ; i < ath_rc_priv->rate_table_size; i++) {
		ath_rc_priv->per[i] = 0;
	}

	/* Determine the valid rates */
	ath_rc_init_valid_txmask(ath_rc_priv);

	for (i = 0; i < WLAN_RC_PHY_MAX; i++) {
		for (j = 0; j < MAX_TX_RATE_PHY; j++)
			ath_rc_priv->valid_phy_rateidx[i][j] = 0;
		ath_rc_priv->valid_phy_ratecnt[i] = 0;
	}

	if (!rateset->rs_nrates) {
		/* No working rate, just initialize valid rates */
		hi = ath_rc_init_validrates(ath_rc_priv, rate_table,
					    ath_rc_priv->ht_cap);
	} else {
		/* Use intersection of working rates and valid rates */
		hi = ath_rc_setvalid_rates(ath_rc_priv, rate_table,
					   rateset, ath_rc_priv->ht_cap);
		if (ath_rc_priv->ht_cap & WLAN_RC_HT_FLAG) {
			hthi = ath_rc_setvalid_htrates(ath_rc_priv,
						       rate_table,
						       ht_mcs,
						       ath_rc_priv->ht_cap);
		}
		hi = A_MAX(hi, hthi);
	}

	ath_rc_priv->rate_table_size = hi + 1;
	ath_rc_priv->rate_max_phy = 0;
	BUG_ON(ath_rc_priv->rate_table_size > RATE_TABLE_SIZE);

	for (i = 0, k = 0; i < WLAN_RC_PHY_MAX; i++) {
		for (j = 0; j < ath_rc_priv->valid_phy_ratecnt[i]; j++) {
			ath_rc_priv->valid_rate_index[k++] =
				ath_rc_priv->valid_phy_rateidx[i][j];
		}

		if (!ath_rc_valid_phyrate(i, rate_table->initial_ratemax, 1)
		    || !ath_rc_priv->valid_phy_ratecnt[i])
			continue;

		ath_rc_priv->rate_max_phy = ath_rc_priv->valid_phy_rateidx[i][j-1];
	}
	BUG_ON(ath_rc_priv->rate_table_size > RATE_TABLE_SIZE);
	BUG_ON(k > RATE_TABLE_SIZE);

	ath_rc_priv->max_valid_rate = k;
	ath_rc_sort_validrates(rate_table, ath_rc_priv);
	ath_rc_priv->rate_max_phy = ath_rc_priv->valid_rate_index[k-4];
	sc->cur_rate_table = rate_table;

	ath_print(common, ATH_DBG_CONFIG,
		  "RC Initialized with capabilities: 0x%x\n",
		  ath_rc_priv->ht_cap);
}

static u8 ath_rc_build_ht_caps(struct ath_softc *sc, struct ieee80211_sta *sta,
			       bool is_cw40, bool is_sgi40)
{
	u8 caps = 0;

	if (sta->ht_cap.ht_supported) {
		caps = WLAN_RC_HT_FLAG;
		if (sc->sc_ah->caps.tx_chainmask != 1 &&
		    ath9k_hw_getcapability(sc->sc_ah, ATH9K_CAP_DS, 0, NULL)) {
			if (sta->ht_cap.mcs.rx_mask[1])
				caps |= WLAN_RC_DS_FLAG;
		}
		if (is_cw40)
			caps |= WLAN_RC_40_FLAG;
		if (is_sgi40)
			caps |= WLAN_RC_SGI_FLAG;
	}

	return caps;
}

/***********************************/
/* mac80211 Rate Control callbacks */
/***********************************/

static void ath_tx_status(void *priv, struct ieee80211_supported_band *sband,
			  struct ieee80211_sta *sta, void *priv_sta,
			  struct sk_buff *skb)
{
	struct ath_softc *sc = priv;
	struct ath_rate_priv *ath_rc_priv = priv_sta;
	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
	struct ieee80211_hdr *hdr;
	int final_ts_idx = 0, tx_status = 0, is_underrun = 0;
	int long_retry = 0;
	__le16 fc;
	int i;

	hdr = (struct ieee80211_hdr *)skb->data;
	fc = hdr->frame_control;
	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
		struct ieee80211_tx_rate *rate = &tx_info->status.rates[i];
		if (!rate->count)
			break;

		final_ts_idx = i;
		long_retry = rate->count - 1;
	}

	if (!priv_sta || !ieee80211_is_data(fc) ||
	    !(tx_info->pad[0] & ATH_TX_INFO_UPDATE_RC))
		return;

	if (tx_info->flags & IEEE80211_TX_STAT_TX_FILTERED)
		return;

	/*
	 * If an underrun error is seen assume it as an excessive retry only
	 * if max frame trigger level has been reached (2 KB for singel stream,
	 * and 4 KB for dual stream). Adjust the long retry as if the frame was
	 * tried hw->max_rate_tries times to affect how ratectrl updates PER for
	 * the failed rate. In case of congestion on the bus penalizing these
	 * type of underruns should help hardware actually transmit new frames
	 * successfully by eventually preferring slower rates. This itself
	 * should also alleviate congestion on the bus.
	 */
	if ((tx_info->pad[0] & ATH_TX_INFO_UNDERRUN) &&
	    (sc->sc_ah->tx_trig_level >= ath_rc_priv->tx_triglevel_max)) {
		tx_status = 1;
		is_underrun = 1;
	}

	if (tx_info->pad[0] & ATH_TX_INFO_XRETRY)
		tx_status = 1;

	ath_rc_tx_status(sc, ath_rc_priv, tx_info, final_ts_idx, tx_status,
			 (is_underrun) ? sc->hw->max_rate_tries : long_retry);

	/* Check if aggregation has to be enabled for this tid */
	if (conf_is_ht(&sc->hw->conf) &&
	    !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
		if (ieee80211_is_data_qos(fc)) {
			u8 *qc, tid;
			struct ath_node *an;

			qc = ieee80211_get_qos_ctl(hdr);
			tid = qc[0] & 0xf;
			an = (struct ath_node *)sta->drv_priv;

			if(ath_tx_aggr_check(sc, an, tid))
				ieee80211_start_tx_ba_session(sta, tid);
		}
	}

	ath_debug_stat_rc(sc, ath_rc_get_rateindex(sc->cur_rate_table,
		&tx_info->status.rates[final_ts_idx]));
}

static void ath_rate_init(void *priv, struct ieee80211_supported_band *sband,
                          struct ieee80211_sta *sta, void *priv_sta)
{
	struct ath_softc *sc = priv;
	struct ath_rate_priv *ath_rc_priv = priv_sta;
	const struct ath_rate_table *rate_table;
	bool is_cw40, is_sgi40;
	int i, j = 0;

	for (i = 0; i < sband->n_bitrates; i++) {
		if (sta->supp_rates[sband->band] & BIT(i)) {
			ath_rc_priv->neg_rates.rs_rates[j]
				= (sband->bitrates[i].bitrate * 2) / 10;
			j++;
		}
	}
	ath_rc_priv->neg_rates.rs_nrates = j;

	if (sta->ht_cap.ht_supported) {
		for (i = 0, j = 0; i < 77; i++) {
			if (sta->ht_cap.mcs.rx_mask[i/8] & (1<<(i%8)))
				ath_rc_priv->neg_ht_rates.rs_rates[j++] = i;
			if (j == ATH_RATE_MAX)
				break;
		}
		ath_rc_priv->neg_ht_rates.rs_nrates = j;
	}

	is_cw40 = sta->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
	is_sgi40 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40;

	/* Choose rate table first */

	if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) ||
	    (sc->sc_ah->opmode == NL80211_IFTYPE_MESH_POINT) ||
	    (sc->sc_ah->opmode == NL80211_IFTYPE_ADHOC)) {
		rate_table = ath_choose_rate_table(sc, sband->band,
		                      sta->ht_cap.ht_supported, is_cw40);
	} else {
		rate_table = hw_rate_table[sc->cur_rate_mode];
	}

	ath_rc_priv->ht_cap = ath_rc_build_ht_caps(sc, sta, is_cw40, is_sgi40);
	ath_rc_init(sc, priv_sta, sband, sta, rate_table);
}

static void ath_rate_update(void *priv, struct ieee80211_supported_band *sband,
			    struct ieee80211_sta *sta, void *priv_sta,
			    u32 changed)
{
	struct ath_softc *sc = priv;
	struct ath_rate_priv *ath_rc_priv = priv_sta;
	const struct ath_rate_table *rate_table = NULL;
	bool oper_cw40 = false, oper_sgi40;
	bool local_cw40 = (ath_rc_priv->ht_cap & WLAN_RC_40_FLAG) ?
		true : false;
	bool local_sgi40 = (ath_rc_priv->ht_cap & WLAN_RC_SGI_FLAG) ?
		true : false;

	/* FIXME: Handle AP mode later when we support CWM */

	if (changed & IEEE80211_RC_HT_CHANGED) {
		if (sc->sc_ah->opmode != NL80211_IFTYPE_STATION)
			return;

		if (sc->hw->conf.channel_type == NL80211_CHAN_HT40MINUS ||
		    sc->hw->conf.channel_type == NL80211_CHAN_HT40PLUS)
			oper_cw40 = true;

		oper_sgi40 = (sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40) ?
			true : false;

		if ((local_cw40 != oper_cw40) || (local_sgi40 != oper_sgi40)) {
			rate_table = ath_choose_rate_table(sc, sband->band,
						   sta->ht_cap.ht_supported,
						   oper_cw40);
			ath_rc_priv->ht_cap = ath_rc_build_ht_caps(sc, sta,
						   oper_cw40, oper_sgi40);
			ath_rc_init(sc, priv_sta, sband, sta, rate_table);

			ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_CONFIG,
				  "Operating HT Bandwidth changed to: %d\n",
				  sc->hw->conf.channel_type);
			sc->cur_rate_table = hw_rate_table[sc->cur_rate_mode];
		}
	}
}

static void *ath_rate_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
{
	struct ath_wiphy *aphy = hw->priv;
	return aphy->sc;
}

static void ath_rate_free(void *priv)
{
	return;
}

static void *ath_rate_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp)
{
	struct ath_softc *sc = priv;
	struct ath_rate_priv *rate_priv;

	rate_priv = kzalloc(sizeof(struct ath_rate_priv), gfp);
	if (!rate_priv) {
		ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_FATAL,
			  "Unable to allocate private rc structure\n");
		return NULL;
	}

	rate_priv->tx_triglevel_max = sc->sc_ah->caps.tx_triglevel_max;

	return rate_priv;
}

static void ath_rate_free_sta(void *priv, struct ieee80211_sta *sta,
			      void *priv_sta)
{
	struct ath_rate_priv *rate_priv = priv_sta;
	kfree(rate_priv);
}

static struct rate_control_ops ath_rate_ops = {
	.module = NULL,
	.name = "ath9k_rate_control",
	.tx_status = ath_tx_status,
	.get_rate = ath_get_rate,
	.rate_init = ath_rate_init,
	.rate_update = ath_rate_update,
	.alloc = ath_rate_alloc,
	.free = ath_rate_free,
	.alloc_sta = ath_rate_alloc_sta,
	.free_sta = ath_rate_free_sta,
};

int ath_rate_control_register(void)
{
	return ieee80211_rate_control_register(&ath_rate_ops);
}

void ath_rate_control_unregister(void)
{
	ieee80211_rate_control_unregister(&ath_rate_ops);
}
OpenPOWER on IntegriCloud