summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/rt2x00/rt2x00mac.c
blob: cef1c878c37ede1775f00278cc0cc58b0bb68bdc (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
/*
	Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
	<http://rt2x00.serialmonkey.com>

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the
	Free Software Foundation, Inc.,
	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*
	Module: rt2x00mac
	Abstract: rt2x00 generic mac80211 routines.
 */

#include <linux/kernel.h>
#include <linux/module.h>

#include "rt2x00.h"
#include "rt2x00lib.h"

static int rt2x00mac_tx_rts_cts(struct rt2x00_dev *rt2x00dev,
				struct data_queue *queue,
				struct sk_buff *frag_skb)
{
	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(frag_skb);
	struct ieee80211_tx_info *rts_info;
	struct sk_buff *skb;
	unsigned int data_length;
	int retval = 0;

	if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
		data_length = sizeof(struct ieee80211_cts);
	else
		data_length = sizeof(struct ieee80211_rts);

	skb = dev_alloc_skb(data_length + rt2x00dev->hw->extra_tx_headroom);
	if (unlikely(!skb)) {
		WARNING(rt2x00dev, "Failed to create RTS/CTS frame.\n");
		return -ENOMEM;
	}

	skb_reserve(skb, rt2x00dev->hw->extra_tx_headroom);
	skb_put(skb, data_length);

	/*
	 * Copy TX information over from original frame to
	 * RTS/CTS frame. Note that we set the no encryption flag
	 * since we don't want this frame to be encrypted.
	 * RTS frames should be acked, while CTS-to-self frames
	 * should not. The ready for TX flag is cleared to prevent
	 * it being automatically send when the descriptor is
	 * written to the hardware.
	 */
	memcpy(skb->cb, frag_skb->cb, sizeof(skb->cb));
	rts_info = IEEE80211_SKB_CB(skb);
	rts_info->control.rates[0].flags &= ~IEEE80211_TX_RC_USE_RTS_CTS;
	rts_info->control.rates[0].flags &= ~IEEE80211_TX_RC_USE_CTS_PROTECT;

	if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
		rts_info->flags |= IEEE80211_TX_CTL_NO_ACK;
	else
		rts_info->flags &= ~IEEE80211_TX_CTL_NO_ACK;

	/* Disable hardware encryption */
	rts_info->control.hw_key = NULL;

	/*
	 * RTS/CTS frame should use the length of the frame plus any
	 * encryption overhead that will be added by the hardware.
	 */
	data_length += rt2x00crypto_tx_overhead(rt2x00dev, skb);

	if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
		ieee80211_ctstoself_get(rt2x00dev->hw, tx_info->control.vif,
					frag_skb->data, data_length, tx_info,
					(struct ieee80211_cts *)(skb->data));
	else
		ieee80211_rts_get(rt2x00dev->hw, tx_info->control.vif,
				  frag_skb->data, data_length, tx_info,
				  (struct ieee80211_rts *)(skb->data));

	retval = rt2x00queue_write_tx_frame(queue, skb, true);
	if (retval) {
		dev_kfree_skb_any(skb);
		WARNING(rt2x00dev, "Failed to send RTS/CTS frame.\n");
	}

	return retval;
}

void rt2x00mac_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
	enum data_queue_qid qid = skb_get_queue_mapping(skb);
	struct data_queue *queue = NULL;

	/*
	 * Mac80211 might be calling this function while we are trying
	 * to remove the device or perhaps suspending it.
	 * Note that we can only stop the TX queues inside the TX path
	 * due to possible race conditions in mac80211.
	 */
	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
		goto exit_free_skb;

	/*
	 * Use the ATIM queue if appropriate and present.
	 */
	if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM &&
	    test_bit(REQUIRE_ATIM_QUEUE, &rt2x00dev->cap_flags))
		qid = QID_ATIM;

	queue = rt2x00queue_get_tx_queue(rt2x00dev, qid);
	if (unlikely(!queue)) {
		ERROR(rt2x00dev,
		      "Attempt to send packet over invalid queue %d.\n"
		      "Please file bug report to %s.\n", qid, DRV_PROJECT);
		goto exit_free_skb;
	}

	/*
	 * If CTS/RTS is required. create and queue that frame first.
	 * Make sure we have at least enough entries available to send
	 * this CTS/RTS frame as well as the data frame.
	 * Note that when the driver has set the set_rts_threshold()
	 * callback function it doesn't need software generation of
	 * either RTS or CTS-to-self frame and handles everything
	 * inside the hardware.
	 */
	if (!rt2x00dev->ops->hw->set_rts_threshold &&
	    (tx_info->control.rates[0].flags & (IEEE80211_TX_RC_USE_RTS_CTS |
						IEEE80211_TX_RC_USE_CTS_PROTECT))) {
		if (rt2x00queue_available(queue) <= 1)
			goto exit_fail;

		if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb))
			goto exit_fail;
	}

	if (unlikely(rt2x00queue_write_tx_frame(queue, skb, false)))
		goto exit_fail;

	if (rt2x00queue_threshold(queue))
		rt2x00queue_pause_queue(queue);

	return;

 exit_fail:
	rt2x00queue_pause_queue(queue);
 exit_free_skb:
	dev_kfree_skb_any(skb);
}
EXPORT_SYMBOL_GPL(rt2x00mac_tx);

int rt2x00mac_start(struct ieee80211_hw *hw)
{
	struct rt2x00_dev *rt2x00dev = hw->priv;

	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
		return 0;

	return rt2x00lib_start(rt2x00dev);
}
EXPORT_SYMBOL_GPL(rt2x00mac_start);

void rt2x00mac_stop(struct ieee80211_hw *hw)
{
	struct rt2x00_dev *rt2x00dev = hw->priv;

	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
		return;

	rt2x00lib_stop(rt2x00dev);
}
EXPORT_SYMBOL_GPL(rt2x00mac_stop);

int rt2x00mac_add_interface(struct ieee80211_hw *hw,
			    struct ieee80211_vif *vif)
{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	struct rt2x00_intf *intf = vif_to_intf(vif);
	struct data_queue *queue = rt2x00dev->bcn;
	struct queue_entry *entry = NULL;
	unsigned int i;

	/*
	 * Don't allow interfaces to be added
	 * the device has disappeared.
	 */
	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
	    !test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
		return -ENODEV;

	switch (vif->type) {
	case NL80211_IFTYPE_AP:
		/*
		 * We don't support mixed combinations of
		 * sta and ap interfaces.
		 */
		if (rt2x00dev->intf_sta_count)
			return -ENOBUFS;

		/*
		 * Check if we exceeded the maximum amount
		 * of supported interfaces.
		 */
		if (rt2x00dev->intf_ap_count >= rt2x00dev->ops->max_ap_intf)
			return -ENOBUFS;

		break;
	case NL80211_IFTYPE_STATION:
	case NL80211_IFTYPE_ADHOC:
	case NL80211_IFTYPE_MESH_POINT:
	case NL80211_IFTYPE_WDS:
		/*
		 * We don't support mixed combinations of
		 * sta and ap interfaces.
		 */
		if (rt2x00dev->intf_ap_count)
			return -ENOBUFS;

		/*
		 * Check if we exceeded the maximum amount
		 * of supported interfaces.
		 */
		if (rt2x00dev->intf_sta_count >= rt2x00dev->ops->max_sta_intf)
			return -ENOBUFS;

		break;
	default:
		return -EINVAL;
	}

	/*
	 * Loop through all beacon queues to find a free
	 * entry. Since there are as much beacon entries
	 * as the maximum interfaces, this search shouldn't
	 * fail.
	 */
	for (i = 0; i < queue->limit; i++) {
		entry = &queue->entries[i];
		if (!test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
			break;
	}

	if (unlikely(i == queue->limit))
		return -ENOBUFS;

	/*
	 * We are now absolutely sure the interface can be created,
	 * increase interface count and start initialization.
	 */

	if (vif->type == NL80211_IFTYPE_AP)
		rt2x00dev->intf_ap_count++;
	else
		rt2x00dev->intf_sta_count++;

	spin_lock_init(&intf->seqlock);
	mutex_init(&intf->beacon_skb_mutex);
	intf->beacon = entry;

	/*
	 * The MAC address must be configured after the device
	 * has been initialized. Otherwise the device can reset
	 * the MAC registers.
	 * The BSSID address must only be configured in AP mode,
	 * however we should not send an empty BSSID address for
	 * STA interfaces at this time, since this can cause
	 * invalid behavior in the device.
	 */
	rt2x00lib_config_intf(rt2x00dev, intf, vif->type,
			      vif->addr, NULL);

	/*
	 * Some filters depend on the current working mode. We can force
	 * an update during the next configure_filter() run by mac80211 by
	 * resetting the current packet_filter state.
	 */
	rt2x00dev->packet_filter = 0;

	return 0;
}
EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);

void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
				struct ieee80211_vif *vif)
{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	struct rt2x00_intf *intf = vif_to_intf(vif);

	/*
	 * Don't allow interfaces to be remove while
	 * either the device has disappeared or when
	 * no interface is present.
	 */
	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
	    (vif->type == NL80211_IFTYPE_AP && !rt2x00dev->intf_ap_count) ||
	    (vif->type != NL80211_IFTYPE_AP && !rt2x00dev->intf_sta_count))
		return;

	if (vif->type == NL80211_IFTYPE_AP)
		rt2x00dev->intf_ap_count--;
	else
		rt2x00dev->intf_sta_count--;

	/*
	 * Release beacon entry so it is available for
	 * new interfaces again.
	 */
	clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);

	/*
	 * Make sure the bssid and mac address registers
	 * are cleared to prevent false ACKing of frames.
	 */
	rt2x00lib_config_intf(rt2x00dev, intf,
			      NL80211_IFTYPE_UNSPECIFIED, NULL, NULL);
}
EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);

int rt2x00mac_config(struct ieee80211_hw *hw, u32 changed)
{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	struct ieee80211_conf *conf = &hw->conf;

	/*
	 * mac80211 might be calling this function while we are trying
	 * to remove the device or perhaps suspending it.
	 */
	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
		return 0;

	/*
	 * Some configuration parameters (e.g. channel and antenna values) can
	 * only be set when the radio is enabled, but do require the RX to
	 * be off. During this period we should keep link tuning enabled,
	 * if for any reason the link tuner must be reset, this will be
	 * handled by rt2x00lib_config().
	 */
	rt2x00queue_stop_queue(rt2x00dev->rx);

	/*
	 * When we've just turned on the radio, we want to reprogram
	 * everything to ensure a consistent state
	 */
	rt2x00lib_config(rt2x00dev, conf, changed);

	/*
	 * After the radio has been enabled we need to configure
	 * the antenna to the default settings. rt2x00lib_config_antenna()
	 * should determine if any action should be taken based on
	 * checking if diversity has been enabled or no antenna changes
	 * have been made since the last configuration change.
	 */
	rt2x00lib_config_antenna(rt2x00dev, rt2x00dev->default_ant);

	/* Turn RX back on */
	rt2x00queue_start_queue(rt2x00dev->rx);

	return 0;
}
EXPORT_SYMBOL_GPL(rt2x00mac_config);

void rt2x00mac_configure_filter(struct ieee80211_hw *hw,
				unsigned int changed_flags,
				unsigned int *total_flags,
				u64 multicast)
{
	struct rt2x00_dev *rt2x00dev = hw->priv;

	/*
	 * Mask off any flags we are going to ignore
	 * from the total_flags field.
	 */
	*total_flags &=
	    FIF_ALLMULTI |
	    FIF_FCSFAIL |
	    FIF_PLCPFAIL |
	    FIF_CONTROL |
	    FIF_PSPOLL |
	    FIF_OTHER_BSS |
	    FIF_PROMISC_IN_BSS;

	/*
	 * Apply some rules to the filters:
	 * - Some filters imply different filters to be set.
	 * - Some things we can't filter out at all.
	 * - Multicast filter seems to kill broadcast traffic so never use it.
	 */
	*total_flags |= FIF_ALLMULTI;
	if (*total_flags & FIF_OTHER_BSS ||
	    *total_flags & FIF_PROMISC_IN_BSS)
		*total_flags |= FIF_PROMISC_IN_BSS | FIF_OTHER_BSS;

	/*
	 * If the device has a single filter for all control frames,
	 * FIF_CONTROL and FIF_PSPOLL flags imply each other.
	 * And if the device has more than one filter for control frames
	 * of different types, but has no a separate filter for PS Poll frames,
	 * FIF_CONTROL flag implies FIF_PSPOLL.
	 */
	if (!test_bit(CAPABILITY_CONTROL_FILTERS, &rt2x00dev->cap_flags)) {
		if (*total_flags & FIF_CONTROL || *total_flags & FIF_PSPOLL)
			*total_flags |= FIF_CONTROL | FIF_PSPOLL;
	}
	if (!test_bit(CAPABILITY_CONTROL_FILTER_PSPOLL, &rt2x00dev->cap_flags)) {
		if (*total_flags & FIF_CONTROL)
			*total_flags |= FIF_PSPOLL;
	}

	/*
	 * Check if there is any work left for us.
	 */
	if (rt2x00dev->packet_filter == *total_flags)
		return;
	rt2x00dev->packet_filter = *total_flags;

	rt2x00dev->ops->lib->config_filter(rt2x00dev, *total_flags);
}
EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter);

static void rt2x00mac_set_tim_iter(void *data, u8 *mac,
				   struct ieee80211_vif *vif)
{
	struct rt2x00_intf *intf = vif_to_intf(vif);

	if (vif->type != NL80211_IFTYPE_AP &&
	    vif->type != NL80211_IFTYPE_ADHOC &&
	    vif->type != NL80211_IFTYPE_MESH_POINT &&
	    vif->type != NL80211_IFTYPE_WDS)
		return;

	set_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags);
}

int rt2x00mac_set_tim(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
		      bool set)
{
	struct rt2x00_dev *rt2x00dev = hw->priv;

	if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
		return 0;

	ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
						   rt2x00mac_set_tim_iter,
						   rt2x00dev);

	/* queue work to upodate the beacon template */
	ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->intf_work);
	return 0;
}
EXPORT_SYMBOL_GPL(rt2x00mac_set_tim);

#ifdef CONFIG_RT2X00_LIB_CRYPTO
static void memcpy_tkip(struct rt2x00lib_crypto *crypto, u8 *key, u8 key_len)
{
	if (key_len > NL80211_TKIP_DATA_OFFSET_ENCR_KEY)
		memcpy(crypto->key,
		       &key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY],
		       sizeof(crypto->key));

	if (key_len > NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY)
		memcpy(crypto->tx_mic,
		       &key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY],
		       sizeof(crypto->tx_mic));

	if (key_len > NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY)
		memcpy(crypto->rx_mic,
		       &key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY],
		       sizeof(crypto->rx_mic));
}

int rt2x00mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
		      struct ieee80211_vif *vif, struct ieee80211_sta *sta,
		      struct ieee80211_key_conf *key)
{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	int (*set_key) (struct rt2x00_dev *rt2x00dev,
			struct rt2x00lib_crypto *crypto,
			struct ieee80211_key_conf *key);
	struct rt2x00lib_crypto crypto;
	static const u8 bcast_addr[ETH_ALEN] =
		{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, };
	struct rt2x00_sta *sta_priv = NULL;

	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
		return 0;
	else if (!test_bit(CAPABILITY_HW_CRYPTO, &rt2x00dev->cap_flags))
		return -EOPNOTSUPP;
	else if (key->keylen > 32)
		return -ENOSPC;

	memset(&crypto, 0, sizeof(crypto));

	crypto.bssidx = rt2x00lib_get_bssidx(rt2x00dev, vif);
	crypto.cipher = rt2x00crypto_key_to_cipher(key);
	if (crypto.cipher == CIPHER_NONE)
		return -EOPNOTSUPP;

	crypto.cmd = cmd;

	if (sta) {
		crypto.address = sta->addr;
		sta_priv = sta_to_rt2x00_sta(sta);
		crypto.wcid = sta_priv->wcid;
	} else
		crypto.address = bcast_addr;

	if (crypto.cipher == CIPHER_TKIP)
		memcpy_tkip(&crypto, &key->key[0], key->keylen);
	else
		memcpy(crypto.key, &key->key[0], key->keylen);
	/*
	 * Each BSS has a maximum of 4 shared keys.
	 * Shared key index values:
	 *	0) BSS0 key0
	 *	1) BSS0 key1
	 *	...
	 *	4) BSS1 key0
	 *	...
	 *	8) BSS2 key0
	 *	...
	 * Both pairwise as shared key indeces are determined by
	 * driver. This is required because the hardware requires
	 * keys to be assigned in correct order (When key 1 is
	 * provided but key 0 is not, then the key is not found
	 * by the hardware during RX).
	 */
	if (cmd == SET_KEY)
		key->hw_key_idx = 0;

	if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
		set_key = rt2x00dev->ops->lib->config_pairwise_key;
	else
		set_key = rt2x00dev->ops->lib->config_shared_key;

	if (!set_key)
		return -EOPNOTSUPP;

	return set_key(rt2x00dev, &crypto, key);
}
EXPORT_SYMBOL_GPL(rt2x00mac_set_key);
#endif /* CONFIG_RT2X00_LIB_CRYPTO */

int rt2x00mac_sta_add(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
		      struct ieee80211_sta *sta)
{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	struct rt2x00_sta *sta_priv = sta_to_rt2x00_sta(sta);

	/*
	 * If there's no space left in the device table store
	 * -1 as wcid but tell mac80211 everything went ok.
	 */
	if (rt2x00dev->ops->lib->sta_add(rt2x00dev, vif, sta))
		sta_priv->wcid = -1;

	return 0;
}
EXPORT_SYMBOL_GPL(rt2x00mac_sta_add);

int rt2x00mac_sta_remove(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
			 struct ieee80211_sta *sta)
{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	struct rt2x00_sta *sta_priv = sta_to_rt2x00_sta(sta);

	/*
	 * If we never sent the STA to the device no need to clean it up.
	 */
	if (sta_priv->wcid < 0)
		return 0;

	return rt2x00dev->ops->lib->sta_remove(rt2x00dev, sta_priv->wcid);
}
EXPORT_SYMBOL_GPL(rt2x00mac_sta_remove);

void rt2x00mac_sw_scan_start(struct ieee80211_hw *hw)
{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	set_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
	rt2x00link_stop_tuner(rt2x00dev);
}
EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_start);

void rt2x00mac_sw_scan_complete(struct ieee80211_hw *hw)
{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	clear_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
	rt2x00link_start_tuner(rt2x00dev);
}
EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_complete);

int rt2x00mac_get_stats(struct ieee80211_hw *hw,
			struct ieee80211_low_level_stats *stats)
{
	struct rt2x00_dev *rt2x00dev = hw->priv;

	/*
	 * The dot11ACKFailureCount, dot11RTSFailureCount and
	 * dot11RTSSuccessCount are updated in interrupt time.
	 * dot11FCSErrorCount is updated in the link tuner.
	 */
	memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));

	return 0;
}
EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);

void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
				struct ieee80211_vif *vif,
				struct ieee80211_bss_conf *bss_conf,
				u32 changes)
{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	struct rt2x00_intf *intf = vif_to_intf(vif);

	/*
	 * mac80211 might be calling this function while we are trying
	 * to remove the device or perhaps suspending it.
	 */
	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
		return;

	/*
	 * Update the BSSID.
	 */
	if (changes & BSS_CHANGED_BSSID)
		rt2x00lib_config_intf(rt2x00dev, intf, vif->type, NULL,
				      bss_conf->bssid);

	/*
	 * Update the beacon. This is only required on USB devices. PCI
	 * devices fetch beacons periodically.
	 */
	if (changes & BSS_CHANGED_BEACON && rt2x00_is_usb(rt2x00dev))
		rt2x00queue_update_beacon(rt2x00dev, vif);

	/*
	 * Start/stop beaconing.
	 */
	if (changes & BSS_CHANGED_BEACON_ENABLED) {
		if (!bss_conf->enable_beacon && intf->enable_beacon) {
			rt2x00queue_clear_beacon(rt2x00dev, vif);
			rt2x00dev->intf_beaconing--;
			intf->enable_beacon = false;

			if (rt2x00dev->intf_beaconing == 0) {
				/*
				 * Last beaconing interface disabled
				 * -> stop beacon queue.
				 */
				mutex_lock(&intf->beacon_skb_mutex);
				rt2x00queue_stop_queue(rt2x00dev->bcn);
				mutex_unlock(&intf->beacon_skb_mutex);
			}


		} else if (bss_conf->enable_beacon && !intf->enable_beacon) {
			rt2x00dev->intf_beaconing++;
			intf->enable_beacon = true;

			if (rt2x00dev->intf_beaconing == 1) {
				/*
				 * First beaconing interface enabled
				 * -> start beacon queue.
				 */
				mutex_lock(&intf->beacon_skb_mutex);
				rt2x00queue_start_queue(rt2x00dev->bcn);
				mutex_unlock(&intf->beacon_skb_mutex);
			}
		}
	}

	/*
	 * When the association status has changed we must reset the link
	 * tuner counter. This is because some drivers determine if they
	 * should perform link tuning based on the number of seconds
	 * while associated or not associated.
	 */
	if (changes & BSS_CHANGED_ASSOC) {
		rt2x00dev->link.count = 0;

		if (bss_conf->assoc)
			rt2x00dev->intf_associated++;
		else
			rt2x00dev->intf_associated--;

		rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
	}

	/*
	 * When the erp information has changed, we should perform
	 * additional configuration steps. For all other changes we are done.
	 */
	if (changes & (BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE |
		       BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BASIC_RATES |
		       BSS_CHANGED_BEACON_INT | BSS_CHANGED_HT))
		rt2x00lib_config_erp(rt2x00dev, intf, bss_conf, changes);
}
EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);

int rt2x00mac_conf_tx(struct ieee80211_hw *hw, u16 queue_idx,
		      const struct ieee80211_tx_queue_params *params)
{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	struct data_queue *queue;

	queue = rt2x00queue_get_tx_queue(rt2x00dev, queue_idx);
	if (unlikely(!queue))
		return -EINVAL;

	/*
	 * The passed variables are stored as real value ((2^n)-1).
	 * Ralink registers require to know the bit number 'n'.
	 */
	if (params->cw_min > 0)
		queue->cw_min = fls(params->cw_min);
	else
		queue->cw_min = 5; /* cw_min: 2^5 = 32. */

	if (params->cw_max > 0)
		queue->cw_max = fls(params->cw_max);
	else
		queue->cw_max = 10; /* cw_min: 2^10 = 1024. */

	queue->aifs = params->aifs;
	queue->txop = params->txop;

	INFO(rt2x00dev,
	     "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d, TXop: %d.\n",
	     queue_idx, queue->cw_min, queue->cw_max, queue->aifs, queue->txop);

	return 0;
}
EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);

void rt2x00mac_rfkill_poll(struct ieee80211_hw *hw)
{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	bool active = !!rt2x00dev->ops->lib->rfkill_poll(rt2x00dev);

	wiphy_rfkill_set_hw_state(hw->wiphy, !active);
}
EXPORT_SYMBOL_GPL(rt2x00mac_rfkill_poll);

void rt2x00mac_flush(struct ieee80211_hw *hw, bool drop)
{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	struct data_queue *queue;

	tx_queue_for_each(rt2x00dev, queue)
		rt2x00queue_flush_queue(queue, drop);
}
EXPORT_SYMBOL_GPL(rt2x00mac_flush);

int rt2x00mac_set_antenna(struct ieee80211_hw *hw, u32 tx_ant, u32 rx_ant)
{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	struct link_ant *ant = &rt2x00dev->link.ant;
	struct antenna_setup *def = &rt2x00dev->default_ant;
	struct antenna_setup setup;

	// The antenna value is not supposed to be 0,
	// or exceed the maximum number of antenna's.
	if (!tx_ant || (tx_ant & ~3) || !rx_ant || (rx_ant & ~3))
		return -EINVAL;

	// When the client tried to configure the antenna to or from
	// diversity mode, we must reset the default antenna as well
	// as that controls the diversity switch.
	if (ant->flags & ANTENNA_TX_DIVERSITY && tx_ant != 3)
		ant->flags &= ~ANTENNA_TX_DIVERSITY;
	if (ant->flags & ANTENNA_RX_DIVERSITY && rx_ant != 3)
		ant->flags &= ~ANTENNA_RX_DIVERSITY;

	// If diversity is being enabled, check if we need hardware
	// or software diversity. In the latter case, reset the value,
	// and make sure we update the antenna flags to have the
	// link tuner pick up the diversity tuning.
	if (tx_ant == 3 && def->tx == ANTENNA_SW_DIVERSITY) {
		tx_ant = ANTENNA_SW_DIVERSITY;
		ant->flags |= ANTENNA_TX_DIVERSITY;
	}

	if (rx_ant == 3 && def->rx == ANTENNA_SW_DIVERSITY) {
		rx_ant = ANTENNA_SW_DIVERSITY;
		ant->flags |= ANTENNA_RX_DIVERSITY;
	}

	setup.tx = tx_ant;
	setup.rx = rx_ant;

	rt2x00lib_config_antenna(rt2x00dev, setup);

	return 0;
}
EXPORT_SYMBOL_GPL(rt2x00mac_set_antenna);

int rt2x00mac_get_antenna(struct ieee80211_hw *hw, u32 *tx_ant, u32 *rx_ant)
{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	struct link_ant *ant = &rt2x00dev->link.ant;
	struct antenna_setup *active = &rt2x00dev->link.ant.active;

	// When software diversity is active, we must report this to the
	// client and not the current active antenna state.
	if (ant->flags & ANTENNA_TX_DIVERSITY)
		*tx_ant = ANTENNA_HW_DIVERSITY;
	else
		*tx_ant = active->tx;

	if (ant->flags & ANTENNA_RX_DIVERSITY)
		*rx_ant = ANTENNA_HW_DIVERSITY;
	else
		*rx_ant = active->rx;

	return 0;
}
EXPORT_SYMBOL_GPL(rt2x00mac_get_antenna);

void rt2x00mac_get_ringparam(struct ieee80211_hw *hw,
			     u32 *tx, u32 *tx_max, u32 *rx, u32 *rx_max)
{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	struct data_queue *queue;

	tx_queue_for_each(rt2x00dev, queue) {
		*tx += queue->length;
		*tx_max += queue->limit;
	}

	*rx = rt2x00dev->rx->length;
	*rx_max = rt2x00dev->rx->limit;
}
EXPORT_SYMBOL_GPL(rt2x00mac_get_ringparam);

bool rt2x00mac_tx_frames_pending(struct ieee80211_hw *hw)
{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	struct data_queue *queue;

	tx_queue_for_each(rt2x00dev, queue) {
		if (!rt2x00queue_empty(queue))
			return true;
	}

	return false;
}
EXPORT_SYMBOL_GPL(rt2x00mac_tx_frames_pending);