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
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
Copyright (C) 2010 Willow Garage <http://www.willowgarage.com>
Copyright (C) 2004 - 2010 Ivo van Doorn <IvDoorn@gmail.com>
<http://rt2x00.serialmonkey.com>
*/
/*
Module: rt2x00lib
Abstract: rt2x00 generic device routines.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/log2.h>
#include <linux/of.h>
#include <linux/of_net.h>
#include "rt2x00.h"
#include "rt2x00lib.h"
/*
* Utility functions.
*/
u32 rt2x00lib_get_bssidx(struct rt2x00_dev *rt2x00dev,
struct ieee80211_vif *vif)
{
/*
* When in STA mode, bssidx is always 0 otherwise local_address[5]
* contains the bss number, see BSS_ID_MASK comments for details.
*/
if (rt2x00dev->intf_sta_count)
return 0;
return vif->addr[5] & (rt2x00dev->ops->max_ap_intf - 1);
}
EXPORT_SYMBOL_GPL(rt2x00lib_get_bssidx);
/*
* Radio control handlers.
*/
int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
{
int status;
/*
* Don't enable the radio twice.
* And check if the hardware button has been disabled.
*/
if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
return 0;
/*
* Initialize all data queues.
*/
rt2x00queue_init_queues(rt2x00dev);
/*
* Enable radio.
*/
status =
rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_ON);
if (status)
return status;
rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_ON);
rt2x00leds_led_radio(rt2x00dev, true);
rt2x00led_led_activity(rt2x00dev, true);
set_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags);
/*
* Enable queues.
*/
rt2x00queue_start_queues(rt2x00dev);
rt2x00link_start_tuner(rt2x00dev);
/*
* Start watchdog monitoring.
*/
rt2x00link_start_watchdog(rt2x00dev);
return 0;
}
void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
{
if (!test_and_clear_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
return;
/*
* Stop watchdog monitoring.
*/
rt2x00link_stop_watchdog(rt2x00dev);
/*
* Stop all queues
*/
rt2x00link_stop_tuner(rt2x00dev);
rt2x00queue_stop_queues(rt2x00dev);
rt2x00queue_flush_queues(rt2x00dev, true);
/*
* Disable radio.
*/
rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF);
rt2x00led_led_activity(rt2x00dev, false);
rt2x00leds_led_radio(rt2x00dev, false);
}
static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
struct ieee80211_vif *vif)
{
struct rt2x00_dev *rt2x00dev = data;
struct rt2x00_intf *intf = vif_to_intf(vif);
/*
* It is possible the radio was disabled while the work had been
* scheduled. If that happens we should return here immediately,
* note that in the spinlock protected area above the delayed_flags
* have been cleared correctly.
*/
if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
return;
if (test_and_clear_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags)) {
mutex_lock(&intf->beacon_skb_mutex);
rt2x00queue_update_beacon(rt2x00dev, vif);
mutex_unlock(&intf->beacon_skb_mutex);
}
}
static void rt2x00lib_intf_scheduled(struct work_struct *work)
{
struct rt2x00_dev *rt2x00dev =
container_of(work, struct rt2x00_dev, intf_work);
/*
* Iterate over each interface and perform the
* requested configurations.
*/
ieee80211_iterate_active_interfaces(rt2x00dev->hw,
IEEE80211_IFACE_ITER_RESUME_ALL,
rt2x00lib_intf_scheduled_iter,
rt2x00dev);
}
static void rt2x00lib_autowakeup(struct work_struct *work)
{
struct rt2x00_dev *rt2x00dev =
container_of(work, struct rt2x00_dev, autowakeup_work.work);
if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
return;
if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_AWAKE))
rt2x00_err(rt2x00dev, "Device failed to wakeup\n");
clear_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
}
/*
* Interrupt context handlers.
*/
static void rt2x00lib_bc_buffer_iter(void *data, u8 *mac,
struct ieee80211_vif *vif)
{
struct ieee80211_tx_control control = {};
struct rt2x00_dev *rt2x00dev = data;
struct sk_buff *skb;
/*
* Only AP mode interfaces do broad- and multicast buffering
*/
if (vif->type != NL80211_IFTYPE_AP)
return;
/*
* Send out buffered broad- and multicast frames
*/
skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
while (skb) {
rt2x00mac_tx(rt2x00dev->hw, &control, skb);
skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
}
}
static void rt2x00lib_beaconupdate_iter(void *data, u8 *mac,
struct ieee80211_vif *vif)
{
struct rt2x00_dev *rt2x00dev = data;
if (vif->type != NL80211_IFTYPE_AP &&
vif->type != NL80211_IFTYPE_ADHOC &&
vif->type != NL80211_IFTYPE_MESH_POINT)
return;
/*
* Update the beacon without locking. This is safe on PCI devices
* as they only update the beacon periodically here. This should
* never be called for USB devices.
*/
WARN_ON(rt2x00_is_usb(rt2x00dev));
rt2x00queue_update_beacon(rt2x00dev, vif);
}
void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
{
if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
return;
/* send buffered bc/mc frames out for every bssid */
ieee80211_iterate_active_interfaces_atomic(
rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
rt2x00lib_bc_buffer_iter, rt2x00dev);
/*
* Devices with pre tbtt interrupt don't need to update the beacon
* here as they will fetch the next beacon directly prior to
* transmission.
*/
if (rt2x00_has_cap_pre_tbtt_interrupt(rt2x00dev))
return;
/* fetch next beacon */
ieee80211_iterate_active_interfaces_atomic(
rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
rt2x00lib_beaconupdate_iter, rt2x00dev);
}
EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
void rt2x00lib_pretbtt(struct rt2x00_dev *rt2x00dev)
{
if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
return;
/* fetch next beacon */
ieee80211_iterate_active_interfaces_atomic(
rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
rt2x00lib_beaconupdate_iter, rt2x00dev);
}
EXPORT_SYMBOL_GPL(rt2x00lib_pretbtt);
void rt2x00lib_dmastart(struct queue_entry *entry)
{
set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
rt2x00queue_index_inc(entry, Q_INDEX);
}
EXPORT_SYMBOL_GPL(rt2x00lib_dmastart);
void rt2x00lib_dmadone(struct queue_entry *entry)
{
set_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags);
clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
rt2x00queue_index_inc(entry, Q_INDEX_DMA_DONE);
}
EXPORT_SYMBOL_GPL(rt2x00lib_dmadone);
static inline int rt2x00lib_txdone_bar_status(struct queue_entry *entry)
{
struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
struct ieee80211_bar *bar = (void *) entry->skb->data;
struct rt2x00_bar_list_entry *bar_entry;
int ret;
if (likely(!ieee80211_is_back_req(bar->frame_control)))
return 0;
/*
* Unlike all other frames, the status report for BARs does
* not directly come from the hardware as it is incapable of
* matching a BA to a previously send BAR. The hardware will
* report all BARs as if they weren't acked at all.
*
* Instead the RX-path will scan for incoming BAs and set the
* block_acked flag if it sees one that was likely caused by
* a BAR from us.
*
* Remove remaining BARs here and return their status for
* TX done processing.
*/
ret = 0;
rcu_read_lock();
list_for_each_entry_rcu(bar_entry, &rt2x00dev->bar_list, list) {
if (bar_entry->entry != entry)
continue;
spin_lock_bh(&rt2x00dev->bar_list_lock);
/* Return whether this BAR was blockacked or not */
ret = bar_entry->block_acked;
/* Remove the BAR from our checklist */
list_del_rcu(&bar_entry->list);
spin_unlock_bh(&rt2x00dev->bar_list_lock);
kfree_rcu(bar_entry, head);
break;
}
rcu_read_unlock();
return ret;
}
static void rt2x00lib_fill_tx_status(struct rt2x00_dev *rt2x00dev,
struct ieee80211_tx_info *tx_info,
struct skb_frame_desc *skbdesc,
struct txdone_entry_desc *txdesc,
bool success)
{
u8 rate_idx, rate_flags, retry_rates;
int i;
rate_idx = skbdesc->tx_rate_idx;
rate_flags = skbdesc->tx_rate_flags;
retry_rates = test_bit(TXDONE_FALLBACK, &txdesc->flags) ?
(txdesc->retry + 1) : 1;
/*
* Initialize TX status
*/
memset(&tx_info->status, 0, sizeof(tx_info->status));
tx_info->status.ack_signal = 0;
/*
* Frame was send with retries, hardware tried
* different rates to send out the frame, at each
* retry it lowered the rate 1 step except when the
* lowest rate was used.
*/
for (i = 0; i < retry_rates && i < IEEE80211_TX_MAX_RATES; i++) {
tx_info->status.rates[i].idx = rate_idx - i;
tx_info->status.rates[i].flags = rate_flags;
if (rate_idx - i == 0) {
/*
* The lowest rate (index 0) was used until the
* number of max retries was reached.
*/
tx_info->status.rates[i].count = retry_rates - i;
i++;
break;
}
tx_info->status.rates[i].count = 1;
}
if (i < (IEEE80211_TX_MAX_RATES - 1))
tx_info->status.rates[i].idx = -1; /* terminate */
if (test_bit(TXDONE_NO_ACK_REQ, &txdesc->flags))
tx_info->flags |= IEEE80211_TX_CTL_NO_ACK;
if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
if (success)
tx_info->flags |= IEEE80211_TX_STAT_ACK;
else
rt2x00dev->low_level_stats.dot11ACKFailureCount++;
}
/*
* Every single frame has it's own tx status, hence report
* every frame as ampdu of size 1.
*
* TODO: if we can find out how many frames were aggregated
* by the hw we could provide the real ampdu_len to mac80211
* which would allow the rc algorithm to better decide on
* which rates are suitable.
*/
if (test_bit(TXDONE_AMPDU, &txdesc->flags) ||
tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
tx_info->flags |= IEEE80211_TX_STAT_AMPDU |
IEEE80211_TX_CTL_AMPDU;
tx_info->status.ampdu_len = 1;
tx_info->status.ampdu_ack_len = success ? 1 : 0;
}
if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
if (success)
rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
else
rt2x00dev->low_level_stats.dot11RTSFailureCount++;
}
}
static void rt2x00lib_clear_entry(struct rt2x00_dev *rt2x00dev,
struct queue_entry *entry)
{
/*
* Make this entry available for reuse.
*/
entry->skb = NULL;
entry->flags = 0;
rt2x00dev->ops->lib->clear_entry(entry);
rt2x00queue_index_inc(entry, Q_INDEX_DONE);
/*
* If the data queue was below the threshold before the txdone
* handler we must make sure the packet queue in the mac80211 stack
* is reenabled when the txdone handler has finished. This has to be
* serialized with rt2x00mac_tx(), otherwise we can wake up queue
* before it was stopped.
*/
spin_lock_bh(&entry->queue->tx_lock);
if (!rt2x00queue_threshold(entry->queue))
rt2x00queue_unpause_queue(entry->queue);
spin_unlock_bh(&entry->queue->tx_lock);
}
void rt2x00lib_txdone_nomatch(struct queue_entry *entry,
struct txdone_entry_desc *txdesc)
{
struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
struct ieee80211_tx_info txinfo = {};
bool success;
/*
* Unmap the skb.
*/
rt2x00queue_unmap_skb(entry);
/*
* Signal that the TX descriptor is no longer in the skb.
*/
skbdesc->flags &= ~SKBDESC_DESC_IN_SKB;
/*
* Send frame to debugfs immediately, after this call is completed
* we are going to overwrite the skb->cb array.
*/
rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry);
/*
* Determine if the frame has been successfully transmitted and
* remove BARs from our check list while checking for their
* TX status.
*/
success =
rt2x00lib_txdone_bar_status(entry) ||
test_bit(TXDONE_SUCCESS, &txdesc->flags);
if (!test_bit(TXDONE_UNKNOWN, &txdesc->flags)) {
/*
* Update TX statistics.
*/
rt2x00dev->link.qual.tx_success += success;
rt2x00dev->link.qual.tx_failed += !success;
rt2x00lib_fill_tx_status(rt2x00dev, &txinfo, skbdesc, txdesc,
success);
ieee80211_tx_status_noskb(rt2x00dev->hw, skbdesc->sta, &txinfo);
}
dev_kfree_skb_any(entry->skb);
rt2x00lib_clear_entry(rt2x00dev, entry);
}
EXPORT_SYMBOL_GPL(rt2x00lib_txdone_nomatch);
void rt2x00lib_txdone(struct queue_entry *entry,
struct txdone_entry_desc *txdesc)
{
struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
u8 skbdesc_flags = skbdesc->flags;
unsigned int header_length;
bool success;
/*
* Unmap the skb.
*/
rt2x00queue_unmap_skb(entry);
/*
* Remove the extra tx headroom from the skb.
*/
skb_pull(entry->skb, rt2x00dev->extra_tx_headroom);
/*
* Signal that the TX descriptor is no longer in the skb.
*/
skbdesc->flags &= ~SKBDESC_DESC_IN_SKB;
/*
* Determine the length of 802.11 header.
*/
header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
/*
* Remove L2 padding which was added during
*/
if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_L2PAD))
rt2x00queue_remove_l2pad(entry->skb, header_length);
/*
* If the IV/EIV data was stripped from the frame before it was
* passed to the hardware, we should now reinsert it again because
* mac80211 will expect the same data to be present it the
* frame as it was passed to us.
*/
if (rt2x00_has_cap_hw_crypto(rt2x00dev))
rt2x00crypto_tx_insert_iv(entry->skb, header_length);
/*
* Send frame to debugfs immediately, after this call is completed
* we are going to overwrite the skb->cb array.
*/
rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry);
/*
* Determine if the frame has been successfully transmitted and
* remove BARs from our check list while checking for their
* TX status.
*/
success =
rt2x00lib_txdone_bar_status(entry) ||
test_bit(TXDONE_SUCCESS, &txdesc->flags) ||
test_bit(TXDONE_UNKNOWN, &txdesc->flags);
/*
* Update TX statistics.
*/
rt2x00dev->link.qual.tx_success += success;
rt2x00dev->link.qual.tx_failed += !success;
rt2x00lib_fill_tx_status(rt2x00dev, tx_info, skbdesc, txdesc, success);
/*
* Only send the status report to mac80211 when it's a frame
* that originated in mac80211. If this was a extra frame coming
* through a mac80211 library call (RTS/CTS) then we should not
* send the status report back.
*/
if (!(skbdesc_flags & SKBDESC_NOT_MAC80211)) {
if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_TASKLET_CONTEXT))
ieee80211_tx_status(rt2x00dev->hw, entry->skb);
else
ieee80211_tx_status_ni(rt2x00dev->hw, entry->skb);
} else {
dev_kfree_skb_any(entry->skb);
}
rt2x00lib_clear_entry(rt2x00dev, entry);
}
EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
void rt2x00lib_txdone_noinfo(struct queue_entry *entry, u32 status)
{
struct txdone_entry_desc txdesc;
txdesc.flags = 0;
__set_bit(status, &txdesc.flags);
txdesc.retry = 0;
rt2x00lib_txdone(entry, &txdesc);
}
EXPORT_SYMBOL_GPL(rt2x00lib_txdone_noinfo);
static u8 *rt2x00lib_find_ie(u8 *data, unsigned int len, u8 ie)
{
struct ieee80211_mgmt *mgmt = (void *)data;
u8 *pos, *end;
pos = (u8 *)mgmt->u.beacon.variable;
end = data + len;
while (pos < end) {
if (pos + 2 + pos[1] > end)
return NULL;
if (pos[0] == ie)
return pos;
pos += 2 + pos[1];
}
return NULL;
}
static void rt2x00lib_sleep(struct work_struct *work)
{
struct rt2x00_dev *rt2x00dev =
container_of(work, struct rt2x00_dev, sleep_work);
if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
return;
/*
* Check again is powersaving is enabled, to prevent races from delayed
* work execution.
*/
if (!test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf,
IEEE80211_CONF_CHANGE_PS);
}
static void rt2x00lib_rxdone_check_ba(struct rt2x00_dev *rt2x00dev,
struct sk_buff *skb,
struct rxdone_entry_desc *rxdesc)
{
struct rt2x00_bar_list_entry *entry;
struct ieee80211_bar *ba = (void *)skb->data;
if (likely(!ieee80211_is_back(ba->frame_control)))
return;
if (rxdesc->size < sizeof(*ba) + FCS_LEN)
return;
rcu_read_lock();
list_for_each_entry_rcu(entry, &rt2x00dev->bar_list, list) {
if (ba->start_seq_num != entry->start_seq_num)
continue;
#define TID_CHECK(a, b) ( \
((a) & cpu_to_le16(IEEE80211_BAR_CTRL_TID_INFO_MASK)) == \
((b) & cpu_to_le16(IEEE80211_BAR_CTRL_TID_INFO_MASK))) \
if (!TID_CHECK(ba->control, entry->control))
continue;
#undef TID_CHECK
if (!ether_addr_equal_64bits(ba->ra, entry->ta))
continue;
if (!ether_addr_equal_64bits(ba->ta, entry->ra))
continue;
/* Mark BAR since we received the according BA */
spin_lock_bh(&rt2x00dev->bar_list_lock);
entry->block_acked = 1;
spin_unlock_bh(&rt2x00dev->bar_list_lock);
break;
}
rcu_read_unlock();
}
static void rt2x00lib_rxdone_check_ps(struct rt2x00_dev *rt2x00dev,
struct sk_buff *skb,
struct rxdone_entry_desc *rxdesc)
{
struct ieee80211_hdr *hdr = (void *) skb->data;
struct ieee80211_tim_ie *tim_ie;
u8 *tim;
u8 tim_len;
bool cam;
/* If this is not a beacon, or if mac80211 has no powersaving
* configured, or if the device is already in powersaving mode
* we can exit now. */
if (likely(!ieee80211_is_beacon(hdr->frame_control) ||
!(rt2x00dev->hw->conf.flags & IEEE80211_CONF_PS)))
return;
/* min. beacon length + FCS_LEN */
if (skb->len <= 40 + FCS_LEN)
return;
/* and only beacons from the associated BSSID, please */
if (!(rxdesc->dev_flags & RXDONE_MY_BSS) ||
!rt2x00dev->aid)
return;
rt2x00dev->last_beacon = jiffies;
tim = rt2x00lib_find_ie(skb->data, skb->len - FCS_LEN, WLAN_EID_TIM);
if (!tim)
return;
if (tim[1] < sizeof(*tim_ie))
return;
tim_len = tim[1];
tim_ie = (struct ieee80211_tim_ie *) &tim[2];
/* Check whenever the PHY can be turned off again. */
/* 1. What about buffered unicast traffic for our AID? */
cam = ieee80211_check_tim(tim_ie, tim_len, rt2x00dev->aid);
/* 2. Maybe the AP wants to send multicast/broadcast data? */
cam |= (tim_ie->bitmap_ctrl & 0x01);
if (!cam && !test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
queue_work(rt2x00dev->workqueue, &rt2x00dev->sleep_work);
}
static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
struct rxdone_entry_desc *rxdesc)
{
struct ieee80211_supported_band *sband;
const struct rt2x00_rate *rate;
unsigned int i;
int signal = rxdesc->signal;
int type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
switch (rxdesc->rate_mode) {
case RATE_MODE_CCK:
case RATE_MODE_OFDM:
/*
* For non-HT rates the MCS value needs to contain the
* actually used rate modulation (CCK or OFDM).
*/
if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
signal = RATE_MCS(rxdesc->rate_mode, signal);
sband = &rt2x00dev->bands[rt2x00dev->curr_band];
for (i = 0; i < sband->n_bitrates; i++) {
rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
if (((type == RXDONE_SIGNAL_PLCP) &&
(rate->plcp == signal)) ||
((type == RXDONE_SIGNAL_BITRATE) &&
(rate->bitrate == signal)) ||
((type == RXDONE_SIGNAL_MCS) &&
(rate->mcs == signal))) {
return i;
}
}
break;
case RATE_MODE_HT_MIX:
case RATE_MODE_HT_GREENFIELD:
if (signal >= 0 && signal <= 76)
return signal;
break;
default:
break;
}
rt2x00_warn(rt2x00dev, "Frame received with unrecognized signal, mode=0x%.4x, signal=0x%.4x, type=%d\n",
rxdesc->rate_mode, signal, type);
return 0;
}
void rt2x00lib_rxdone(struct queue_entry *entry, gfp_t gfp)
{
struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
struct rxdone_entry_desc rxdesc;
struct sk_buff *skb;
struct ieee80211_rx_status *rx_status;
unsigned int header_length;
int rate_idx;
if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
goto submit_entry;
if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
goto submit_entry;
/*
* Allocate a new sk_buffer. If no new buffer available, drop the
* received frame and reuse the existing buffer.
*/
skb = rt2x00queue_alloc_rxskb(entry, gfp);
if (!skb)
goto submit_entry;
/*
* Unmap the skb.
*/
rt2x00queue_unmap_skb(entry);
/*
* Extract the RXD details.
*/
memset(&rxdesc, 0, sizeof(rxdesc));
rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
/*
* Check for valid size in case we get corrupted descriptor from
* hardware.
*/
if (unlikely(rxdesc.size == 0 ||
rxdesc.size > entry->queue->data_size)) {
rt2x00_err(rt2x00dev, "Wrong frame size %d max %d\n",
rxdesc.size, entry->queue->data_size);
dev_kfree_skb(entry->skb);
goto renew_skb;
}
/*
* The data behind the ieee80211 header must be
* aligned on a 4 byte boundary.
*/
header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
/*
* Hardware might have stripped the IV/EIV/ICV data,
* in that case it is possible that the data was
* provided separately (through hardware descriptor)
* in which case we should reinsert the data into the frame.
*/
if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
(rxdesc.flags & RX_FLAG_IV_STRIPPED))
rt2x00crypto_rx_insert_iv(entry->skb, header_length,
&rxdesc);
else if (header_length &&
(rxdesc.size > header_length) &&
(rxdesc.dev_flags & RXDONE_L2PAD))
rt2x00queue_remove_l2pad(entry->skb, header_length);
/* Trim buffer to correct size */
skb_trim(entry->skb, rxdesc.size);
/*
* Translate the signal to the correct bitrate index.
*/
rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
if (rxdesc.rate_mode == RATE_MODE_HT_MIX ||
rxdesc.rate_mode == RATE_MODE_HT_GREENFIELD)
rxdesc.encoding = RX_ENC_HT;
/*
* Check if this is a beacon, and more frames have been
* buffered while we were in powersaving mode.
*/
rt2x00lib_rxdone_check_ps(rt2x00dev, entry->skb, &rxdesc);
/*
* Check for incoming BlockAcks to match to the BlockAckReqs
* we've send out.
*/
rt2x00lib_rxdone_check_ba(rt2x00dev, entry->skb, &rxdesc);
/*
* Update extra components
*/
rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry);
/*
* Initialize RX status information, and send frame
* to mac80211.
*/
rx_status = IEEE80211_SKB_RXCB(entry->skb);
/* Ensure that all fields of rx_status are initialized
* properly. The skb->cb array was used for driver
* specific informations, so rx_status might contain
* garbage.
*/
memset(rx_status, 0, sizeof(*rx_status));
rx_status->mactime = rxdesc.timestamp;
rx_status->band = rt2x00dev->curr_band;
rx_status->freq = rt2x00dev->curr_freq;
rx_status->rate_idx = rate_idx;
rx_status->signal = rxdesc.rssi;
rx_status->flag = rxdesc.flags;
rx_status->enc_flags = rxdesc.enc_flags;
rx_status->encoding = rxdesc.encoding;
rx_status->bw = rxdesc.bw;
rx_status->antenna = rt2x00dev->link.ant.active.rx;
ieee80211_rx_ni(rt2x00dev->hw, entry->skb);
renew_skb:
/*
* Replace the skb with the freshly allocated one.
*/
entry->skb = skb;
submit_entry:
entry->flags = 0;
rt2x00queue_index_inc(entry, Q_INDEX_DONE);
if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
rt2x00dev->ops->lib->clear_entry(entry);
}
EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
/*
* Driver initialization handlers.
*/
const struct rt2x00_rate rt2x00_supported_rates[12] = {
{
.flags = DEV_RATE_CCK,
.bitrate = 10,
.ratemask = BIT(0),
.plcp = 0x00,
.mcs = RATE_MCS(RATE_MODE_CCK, 0),
},
{
.flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
.bitrate = 20,
.ratemask = BIT(1),
.plcp = 0x01,
.mcs = RATE_MCS(RATE_MODE_CCK, 1),
},
{
.flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
.bitrate = 55,
.ratemask = BIT(2),
.plcp = 0x02,
.mcs = RATE_MCS(RATE_MODE_CCK, 2),
},
{
.flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
.bitrate = 110,
.ratemask = BIT(3),
.plcp = 0x03,
.mcs = RATE_MCS(RATE_MODE_CCK, 3),
},
{
.flags = DEV_RATE_OFDM,
.bitrate = 60,
.ratemask = BIT(4),
.plcp = 0x0b,
.mcs = RATE_MCS(RATE_MODE_OFDM, 0),
},
{
.flags = DEV_RATE_OFDM,
.bitrate = 90,
.ratemask = BIT(5),
.plcp = 0x0f,
.mcs = RATE_MCS(RATE_MODE_OFDM, 1),
},
{
.flags = DEV_RATE_OFDM,
.bitrate = 120,
.ratemask = BIT(6),
.plcp = 0x0a,
.mcs = RATE_MCS(RATE_MODE_OFDM, 2),
},
{
.flags = DEV_RATE_OFDM,
.bitrate = 180,
.ratemask = BIT(7),
.plcp = 0x0e,
.mcs = RATE_MCS(RATE_MODE_OFDM, 3),
},
{
.flags = DEV_RATE_OFDM,
.bitrate = 240,
.ratemask = BIT(8),
.plcp = 0x09,
.mcs = RATE_MCS(RATE_MODE_OFDM, 4),
},
{
.flags = DEV_RATE_OFDM,
.bitrate = 360,
.ratemask = BIT(9),
.plcp = 0x0d,
.mcs = RATE_MCS(RATE_MODE_OFDM, 5),
},
{
.flags = DEV_RATE_OFDM,
.bitrate = 480,
.ratemask = BIT(10),
.plcp = 0x08,
.mcs = RATE_MCS(RATE_MODE_OFDM, 6),
},
{
.flags = DEV_RATE_OFDM,
.bitrate = 540,
.ratemask = BIT(11),
.plcp = 0x0c,
.mcs = RATE_MCS(RATE_MODE_OFDM, 7),
},
};
static void rt2x00lib_channel(struct ieee80211_channel *entry,
const int channel, const int tx_power,
const int value)
{
/* XXX: this assumption about the band is wrong for 802.11j */
entry->band = channel <= 14 ? NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
entry->center_freq = ieee80211_channel_to_frequency(channel,
entry->band);
entry->hw_value = value;
entry->max_power = tx_power;
entry->max_antenna_gain = 0xff;
}
static void rt2x00lib_rate(struct ieee80211_rate *entry,
const u16 index, const struct rt2x00_rate *rate)
{
entry->flags = 0;
entry->bitrate = rate->bitrate;
entry->hw_value = index;
entry->hw_value_short = index;
if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
}
void rt2x00lib_set_mac_address(struct rt2x00_dev *rt2x00dev, u8 *eeprom_mac_addr)
{
of_get_mac_address(rt2x00dev->dev->of_node, eeprom_mac_addr);
if (!is_valid_ether_addr(eeprom_mac_addr)) {
eth_random_addr(eeprom_mac_addr);
rt2x00_eeprom_dbg(rt2x00dev, "MAC: %pM\n", eeprom_mac_addr);
}
}
EXPORT_SYMBOL_GPL(rt2x00lib_set_mac_address);
static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
struct hw_mode_spec *spec)
{
struct ieee80211_hw *hw = rt2x00dev->hw;
struct ieee80211_channel *channels;
struct ieee80211_rate *rates;
unsigned int num_rates;
unsigned int i;
num_rates = 0;
if (spec->supported_rates & SUPPORT_RATE_CCK)
num_rates += 4;
if (spec->supported_rates & SUPPORT_RATE_OFDM)
num_rates += 8;
channels = kcalloc(spec->num_channels, sizeof(*channels), GFP_KERNEL);
if (!channels)
return -ENOMEM;
rates = kcalloc(num_rates, sizeof(*rates), GFP_KERNEL);
if (!rates)
goto exit_free_channels;
/*
* Initialize Rate list.
*/
for (i = 0; i < num_rates; i++)
rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
/*
* Initialize Channel list.
*/
for (i = 0; i < spec->num_channels; i++) {
rt2x00lib_channel(&channels[i],
spec->channels[i].channel,
spec->channels_info[i].max_power, i);
}
/*
* Intitialize 802.11b, 802.11g
* Rates: CCK, OFDM.
* Channels: 2.4 GHz
*/
if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
rt2x00dev->bands[NL80211_BAND_2GHZ].n_channels = 14;
rt2x00dev->bands[NL80211_BAND_2GHZ].n_bitrates = num_rates;
rt2x00dev->bands[NL80211_BAND_2GHZ].channels = channels;
rt2x00dev->bands[NL80211_BAND_2GHZ].bitrates = rates;
hw->wiphy->bands[NL80211_BAND_2GHZ] =
&rt2x00dev->bands[NL80211_BAND_2GHZ];
memcpy(&rt2x00dev->bands[NL80211_BAND_2GHZ].ht_cap,
&spec->ht, sizeof(spec->ht));
}
/*
* Intitialize 802.11a
* Rates: OFDM.
* Channels: OFDM, UNII, HiperLAN2.
*/
if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
rt2x00dev->bands[NL80211_BAND_5GHZ].n_channels =
spec->num_channels - 14;
rt2x00dev->bands[NL80211_BAND_5GHZ].n_bitrates =
num_rates - 4;
rt2x00dev->bands[NL80211_BAND_5GHZ].channels = &channels[14];
rt2x00dev->bands[NL80211_BAND_5GHZ].bitrates = &rates[4];
hw->wiphy->bands[NL80211_BAND_5GHZ] =
&rt2x00dev->bands[NL80211_BAND_5GHZ];
memcpy(&rt2x00dev->bands[NL80211_BAND_5GHZ].ht_cap,
&spec->ht, sizeof(spec->ht));
}
return 0;
exit_free_channels:
kfree(channels);
rt2x00_err(rt2x00dev, "Allocation ieee80211 modes failed\n");
return -ENOMEM;
}
static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
{
if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
ieee80211_unregister_hw(rt2x00dev->hw);
if (likely(rt2x00dev->hw->wiphy->bands[NL80211_BAND_2GHZ])) {
kfree(rt2x00dev->hw->wiphy->bands[NL80211_BAND_2GHZ]->channels);
kfree(rt2x00dev->hw->wiphy->bands[NL80211_BAND_2GHZ]->bitrates);
rt2x00dev->hw->wiphy->bands[NL80211_BAND_2GHZ] = NULL;
rt2x00dev->hw->wiphy->bands[NL80211_BAND_5GHZ] = NULL;
}
kfree(rt2x00dev->spec.channels_info);
}
static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
{
struct hw_mode_spec *spec = &rt2x00dev->spec;
int status;
if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
return 0;
/*
* Initialize HW modes.
*/
status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
if (status)
return status;
/*
* Initialize HW fields.
*/
rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
/*
* Initialize extra TX headroom required.
*/
rt2x00dev->hw->extra_tx_headroom =
max_t(unsigned int, IEEE80211_TX_STATUS_HEADROOM,
rt2x00dev->extra_tx_headroom);
/*
* Take TX headroom required for alignment into account.
*/
if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_L2PAD))
rt2x00dev->hw->extra_tx_headroom += RT2X00_L2PAD_SIZE;
else if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DMA))
rt2x00dev->hw->extra_tx_headroom += RT2X00_ALIGN_SIZE;
/*
* Tell mac80211 about the size of our private STA structure.
*/
rt2x00dev->hw->sta_data_size = sizeof(struct rt2x00_sta);
/*
* Allocate tx status FIFO for driver use.
*/
if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_TXSTATUS_FIFO)) {
/*
* Allocate the txstatus fifo. In the worst case the tx
* status fifo has to hold the tx status of all entries
* in all tx queues. Hence, calculate the kfifo size as
* tx_queues * entry_num and round up to the nearest
* power of 2.
*/
int kfifo_size =
roundup_pow_of_two(rt2x00dev->ops->tx_queues *
rt2x00dev->tx->limit *
sizeof(u32));
status = kfifo_alloc(&rt2x00dev->txstatus_fifo, kfifo_size,
GFP_KERNEL);
if (status)
return status;
}
/*
* Initialize tasklets if used by the driver. Tasklets are
* disabled until the interrupts are turned on. The driver
* has to handle that.
*/
#define RT2X00_TASKLET_INIT(taskletname) \
if (rt2x00dev->ops->lib->taskletname) { \
tasklet_setup(&rt2x00dev->taskletname, \
rt2x00dev->ops->lib->taskletname); \
}
RT2X00_TASKLET_INIT(txstatus_tasklet);
RT2X00_TASKLET_INIT(pretbtt_tasklet);
RT2X00_TASKLET_INIT(tbtt_tasklet);
RT2X00_TASKLET_INIT(rxdone_tasklet);
RT2X00_TASKLET_INIT(autowake_tasklet);
#undef RT2X00_TASKLET_INIT
/*
* Register HW.
*/
status = ieee80211_register_hw(rt2x00dev->hw);
if (status)
return status;
set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
return 0;
}
/*
* Initialization/uninitialization handlers.
*/
static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
{
if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
return;
/*
* Stop rfkill polling.
*/
if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DELAYED_RFKILL))
rt2x00rfkill_unregister(rt2x00dev);
/*
* Allow the HW to uninitialize.
*/
rt2x00dev->ops->lib->uninitialize(rt2x00dev);
/*
* Free allocated queue entries.
*/
rt2x00queue_uninitialize(rt2x00dev);
}
static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
{
int status;
if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
return 0;
/*
* Allocate all queue entries.
*/
status = rt2x00queue_initialize(rt2x00dev);
if (status)
return status;
/*
* Initialize the device.
*/
status = rt2x00dev->ops->lib->initialize(rt2x00dev);
if (status) {
rt2x00queue_uninitialize(rt2x00dev);
return status;
}
set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
/*
* Start rfkill polling.
*/
if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DELAYED_RFKILL))
rt2x00rfkill_register(rt2x00dev);
return 0;
}
int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
{
int retval = 0;
/*
* If this is the first interface which is added,
* we should load the firmware now.
*/
retval = rt2x00lib_load_firmware(rt2x00dev);
if (retval)
goto out;
/*
* Initialize the device.
*/
retval = rt2x00lib_initialize(rt2x00dev);
if (retval)
goto out;
rt2x00dev->intf_ap_count = 0;
rt2x00dev->intf_sta_count = 0;
rt2x00dev->intf_associated = 0;
/* Enable the radio */
retval = rt2x00lib_enable_radio(rt2x00dev);
if (retval)
goto out;
set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
out:
return retval;
}
void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
{
if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
return;
/*
* Perhaps we can add something smarter here,
* but for now just disabling the radio should do.
*/
rt2x00lib_disable_radio(rt2x00dev);
rt2x00dev->intf_ap_count = 0;
rt2x00dev->intf_sta_count = 0;
rt2x00dev->intf_associated = 0;
}
static inline void rt2x00lib_set_if_combinations(struct rt2x00_dev *rt2x00dev)
{
struct ieee80211_iface_limit *if_limit;
struct ieee80211_iface_combination *if_combination;
if (rt2x00dev->ops->max_ap_intf < 2)
return;
/*
* Build up AP interface limits structure.
*/
if_limit = &rt2x00dev->if_limits_ap;
if_limit->max = rt2x00dev->ops->max_ap_intf;
if_limit->types = BIT(NL80211_IFTYPE_AP);
#ifdef CONFIG_MAC80211_MESH
if_limit->types |= BIT(NL80211_IFTYPE_MESH_POINT);
#endif
/*
* Build up AP interface combinations structure.
*/
if_combination = &rt2x00dev->if_combinations[IF_COMB_AP];
if_combination->limits = if_limit;
if_combination->n_limits = 1;
if_combination->max_interfaces = if_limit->max;
if_combination->num_different_channels = 1;
/*
* Finally, specify the possible combinations to mac80211.
*/
rt2x00dev->hw->wiphy->iface_combinations = rt2x00dev->if_combinations;
rt2x00dev->hw->wiphy->n_iface_combinations = 1;
}
static unsigned int rt2x00dev_extra_tx_headroom(struct rt2x00_dev *rt2x00dev)
{
if (WARN_ON(!rt2x00dev->tx))
return 0;
if (rt2x00_is_usb(rt2x00dev))
return rt2x00dev->tx[0].winfo_size + rt2x00dev->tx[0].desc_size;
return rt2x00dev->tx[0].winfo_size;
}
/*
* driver allocation handlers.
*/
int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
{
int retval = -ENOMEM;
/*
* Set possible interface combinations.
*/
rt2x00lib_set_if_combinations(rt2x00dev);
/*
* Allocate the driver data memory, if necessary.
*/
if (rt2x00dev->ops->drv_data_size > 0) {
rt2x00dev->drv_data = kzalloc(rt2x00dev->ops->drv_data_size,
GFP_KERNEL);
if (!rt2x00dev->drv_data) {
retval = -ENOMEM;
goto exit;
}
}
spin_lock_init(&rt2x00dev->irqmask_lock);
mutex_init(&rt2x00dev->csr_mutex);
mutex_init(&rt2x00dev->conf_mutex);
INIT_LIST_HEAD(&rt2x00dev->bar_list);
spin_lock_init(&rt2x00dev->bar_list_lock);
hrtimer_init(&rt2x00dev->txstatus_timer, CLOCK_MONOTONIC,
HRTIMER_MODE_REL);
set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
/*
* Make room for rt2x00_intf inside the per-interface
* structure ieee80211_vif.
*/
rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
/*
* rt2x00 devices can only use the last n bits of the MAC address
* for virtual interfaces.
*/
rt2x00dev->hw->wiphy->addr_mask[ETH_ALEN - 1] =
(rt2x00dev->ops->max_ap_intf - 1);
/*
* Initialize work.
*/
rt2x00dev->workqueue =
alloc_ordered_workqueue("%s", 0, wiphy_name(rt2x00dev->hw->wiphy));
if (!rt2x00dev->workqueue) {
retval = -ENOMEM;
goto exit;
}
INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
INIT_DELAYED_WORK(&rt2x00dev->autowakeup_work, rt2x00lib_autowakeup);
INIT_WORK(&rt2x00dev->sleep_work, rt2x00lib_sleep);
/*
* Let the driver probe the device to detect the capabilities.
*/
retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
if (retval) {
rt2x00_err(rt2x00dev, "Failed to allocate device\n");
goto exit;
}
/*
* Allocate queue array.
*/
retval = rt2x00queue_allocate(rt2x00dev);
if (retval)
goto exit;
/* Cache TX headroom value */
rt2x00dev->extra_tx_headroom = rt2x00dev_extra_tx_headroom(rt2x00dev);
/*
* Determine which operating modes are supported, all modes
* which require beaconing, depend on the availability of
* beacon entries.
*/
rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
if (rt2x00dev->bcn->limit > 0)
rt2x00dev->hw->wiphy->interface_modes |=
BIT(NL80211_IFTYPE_ADHOC) |
#ifdef CONFIG_MAC80211_MESH
BIT(NL80211_IFTYPE_MESH_POINT) |
#endif
BIT(NL80211_IFTYPE_AP);
rt2x00dev->hw->wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
wiphy_ext_feature_set(rt2x00dev->hw->wiphy,
NL80211_EXT_FEATURE_CQM_RSSI_LIST);
/*
* Initialize ieee80211 structure.
*/
retval = rt2x00lib_probe_hw(rt2x00dev);
if (retval) {
rt2x00_err(rt2x00dev, "Failed to initialize hw\n");
goto exit;
}
/*
* Register extra components.
*/
rt2x00link_register(rt2x00dev);
rt2x00leds_register(rt2x00dev);
rt2x00debug_register(rt2x00dev);
/*
* Start rfkill polling.
*/
if (!rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DELAYED_RFKILL))
rt2x00rfkill_register(rt2x00dev);
return 0;
exit:
rt2x00lib_remove_dev(rt2x00dev);
return retval;
}
EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
{
clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
/*
* Stop rfkill polling.
*/
if (!rt2x00_has_cap_flag(rt2x00dev, REQUIRE_DELAYED_RFKILL))
rt2x00rfkill_unregister(rt2x00dev);
/*
* Disable radio.
*/
rt2x00lib_disable_radio(rt2x00dev);
/*
* Stop all work.
*/
cancel_work_sync(&rt2x00dev->intf_work);
cancel_delayed_work_sync(&rt2x00dev->autowakeup_work);
cancel_work_sync(&rt2x00dev->sleep_work);
hrtimer_cancel(&rt2x00dev->txstatus_timer);
/*
* Kill the tx status tasklet.
*/
tasklet_kill(&rt2x00dev->txstatus_tasklet);
tasklet_kill(&rt2x00dev->pretbtt_tasklet);
tasklet_kill(&rt2x00dev->tbtt_tasklet);
tasklet_kill(&rt2x00dev->rxdone_tasklet);
tasklet_kill(&rt2x00dev->autowake_tasklet);
/*
* Uninitialize device.
*/
rt2x00lib_uninitialize(rt2x00dev);
if (rt2x00dev->workqueue)
destroy_workqueue(rt2x00dev->workqueue);
/*
* Free the tx status fifo.
*/
kfifo_free(&rt2x00dev->txstatus_fifo);
/*
* Free extra components
*/
rt2x00debug_deregister(rt2x00dev);
rt2x00leds_unregister(rt2x00dev);
/*
* Free ieee80211_hw memory.
*/
rt2x00lib_remove_hw(rt2x00dev);
/*
* Free firmware image.
*/
rt2x00lib_free_firmware(rt2x00dev);
/*
* Free queue structures.
*/
rt2x00queue_free(rt2x00dev);
/*
* Free the driver data.
*/
kfree(rt2x00dev->drv_data);
}
EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
/*
* Device state handlers
*/
int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev)
{
rt2x00_dbg(rt2x00dev, "Going to sleep\n");
/*
* Prevent mac80211 from accessing driver while suspended.
*/
if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
return 0;
/*
* Cleanup as much as possible.
*/
rt2x00lib_uninitialize(rt2x00dev);
/*
* Suspend/disable extra components.
*/
rt2x00leds_suspend(rt2x00dev);
rt2x00debug_deregister(rt2x00dev);
/*
* Set device mode to sleep for power management,
* on some hardware this call seems to consistently fail.
* From the specifications it is hard to tell why it fails,
* and if this is a "bad thing".
* Overall it is safe to just ignore the failure and
* continue suspending. The only downside is that the
* device will not be in optimal power save mode, but with
* the radio and the other components already disabled the
* device is as good as disabled.
*/
if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
rt2x00_warn(rt2x00dev, "Device failed to enter sleep state, continue suspending\n");
return 0;
}
EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
{
rt2x00_dbg(rt2x00dev, "Waking up\n");
/*
* Restore/enable extra components.
*/
rt2x00debug_register(rt2x00dev);
rt2x00leds_resume(rt2x00dev);
/*
* We are ready again to receive requests from mac80211.
*/
set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
return 0;
}
EXPORT_SYMBOL_GPL(rt2x00lib_resume);
/*
* rt2x00lib module information.
*/
MODULE_AUTHOR(DRV_PROJECT);
MODULE_VERSION(DRV_VERSION);
MODULE_DESCRIPTION("rt2x00 library");
MODULE_LICENSE("GPL");
|