aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/wireless/b43/xmit.c
blob: eae9b8052658c3c28de328df9016a0bb82917ff8 (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
/*

  Broadcom B43 wireless driver

  Transmission (TX/RX) related functions.

  Copyright (C) 2005 Martin Langer <martin-langer@gmx.de>
  Copyright (C) 2005 Stefano Brivio <stefano.brivio@polimi.it>
  Copyright (C) 2005, 2006 Michael Buesch <mb@bu3sch.de>
  Copyright (C) 2005 Danny van Dyk <kugelfang@gentoo.org>
  Copyright (C) 2005 Andreas Jaggi <andreas.jaggi@waterwave.ch>

  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; see the file COPYING.  If not, write to
  the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
  Boston, MA 02110-1301, USA.

*/

#include "xmit.h"
#include "phy_common.h"
#include "dma.h"
#include "pio.h"


/* Extract the bitrate index out of a CCK PLCP header. */
static int b43_plcp_get_bitrate_idx_cck(struct b43_plcp_hdr6 *plcp)
{
	switch (plcp->raw[0]) {
	case 0x0A:
		return 0;
	case 0x14:
		return 1;
	case 0x37:
		return 2;
	case 0x6E:
		return 3;
	}
	return -1;
}

/* Extract the bitrate index out of an OFDM PLCP header. */
static u8 b43_plcp_get_bitrate_idx_ofdm(struct b43_plcp_hdr6 *plcp, bool aphy)
{
	int base = aphy ? 0 : 4;

	switch (plcp->raw[0] & 0xF) {
	case 0xB:
		return base + 0;
	case 0xF:
		return base + 1;
	case 0xA:
		return base + 2;
	case 0xE:
		return base + 3;
	case 0x9:
		return base + 4;
	case 0xD:
		return base + 5;
	case 0x8:
		return base + 6;
	case 0xC:
		return base + 7;
	}
	return -1;
}

u8 b43_plcp_get_ratecode_cck(const u8 bitrate)
{
	switch (bitrate) {
	case B43_CCK_RATE_1MB:
		return 0x0A;
	case B43_CCK_RATE_2MB:
		return 0x14;
	case B43_CCK_RATE_5MB:
		return 0x37;
	case B43_CCK_RATE_11MB:
		return 0x6E;
	}
	B43_WARN_ON(1);
	return 0;
}

u8 b43_plcp_get_ratecode_ofdm(const u8 bitrate)
{
	switch (bitrate) {
	case B43_OFDM_RATE_6MB:
		return 0xB;
	case B43_OFDM_RATE_9MB:
		return 0xF;
	case B43_OFDM_RATE_12MB:
		return 0xA;
	case B43_OFDM_RATE_18MB:
		return 0xE;
	case B43_OFDM_RATE_24MB:
		return 0x9;
	case B43_OFDM_RATE_36MB:
		return 0xD;
	case B43_OFDM_RATE_48MB:
		return 0x8;
	case B43_OFDM_RATE_54MB:
		return 0xC;
	}
	B43_WARN_ON(1);
	return 0;
}

void b43_generate_plcp_hdr(struct b43_plcp_hdr4 *plcp,
			   const u16 octets, const u8 bitrate)
{
	__le32 *data = &(plcp->data);
	__u8 *raw = plcp->raw;

	if (b43_is_ofdm_rate(bitrate)) {
		u32 d;

		d = b43_plcp_get_ratecode_ofdm(bitrate);
		B43_WARN_ON(octets & 0xF000);
		d |= (octets << 5);
		*data = cpu_to_le32(d);
	} else {
		u32 plen;

		plen = octets * 16 / bitrate;
		if ((octets * 16 % bitrate) > 0) {
			plen++;
			if ((bitrate == B43_CCK_RATE_11MB)
			    && ((octets * 8 % 11) < 4)) {
				raw[1] = 0x84;
			} else
				raw[1] = 0x04;
		} else
			raw[1] = 0x04;
		*data |= cpu_to_le32(plen << 16);
		raw[0] = b43_plcp_get_ratecode_cck(bitrate);
	}
}

static u8 b43_calc_fallback_rate(u8 bitrate)
{
	switch (bitrate) {
	case B43_CCK_RATE_1MB:
		return B43_CCK_RATE_1MB;
	case B43_CCK_RATE_2MB:
		return B43_CCK_RATE_1MB;
	case B43_CCK_RATE_5MB:
		return B43_CCK_RATE_2MB;
	case B43_CCK_RATE_11MB:
		return B43_CCK_RATE_5MB;
	case B43_OFDM_RATE_6MB:
		return B43_CCK_RATE_5MB;
	case B43_OFDM_RATE_9MB:
		return B43_OFDM_RATE_6MB;
	case B43_OFDM_RATE_12MB:
		return B43_OFDM_RATE_9MB;
	case B43_OFDM_RATE_18MB:
		return B43_OFDM_RATE_12MB;
	case B43_OFDM_RATE_24MB:
		return B43_OFDM_RATE_18MB;
	case B43_OFDM_RATE_36MB:
		return B43_OFDM_RATE_24MB;
	case B43_OFDM_RATE_48MB:
		return B43_OFDM_RATE_36MB;
	case B43_OFDM_RATE_54MB:
		return B43_OFDM_RATE_48MB;
	}
	B43_WARN_ON(1);
	return 0;
}

/* Generate a TX data header. */
int b43_generate_txhdr(struct b43_wldev *dev,
		       u8 *_txhdr,
		       const unsigned char *fragment_data,
		       unsigned int fragment_len,
		       struct ieee80211_tx_info *info,
		       u16 cookie)
{
	struct b43_txhdr *txhdr = (struct b43_txhdr *)_txhdr;
	const struct b43_phy *phy = &dev->phy;
	const struct ieee80211_hdr *wlhdr =
	    (const struct ieee80211_hdr *)fragment_data;
	int use_encryption = !!info->control.hw_key;
	__le16 fctl = wlhdr->frame_control;
	struct ieee80211_rate *fbrate;
	u8 rate, rate_fb;
	int rate_ofdm, rate_fb_ofdm;
	unsigned int plcp_fragment_len;
	u32 mac_ctl = 0;
	u16 phy_ctl = 0;
	u8 extra_ft = 0;
	struct ieee80211_rate *txrate;
	struct ieee80211_tx_rate *rates;

	memset(txhdr, 0, sizeof(*txhdr));

	txrate = ieee80211_get_tx_rate(dev->wl->hw, info);
	rate = txrate ? txrate->hw_value : B43_CCK_RATE_1MB;
	rate_ofdm = b43_is_ofdm_rate(rate);
	fbrate = ieee80211_get_alt_retry_rate(dev->wl->hw, info, 0) ? : txrate;
	rate_fb = fbrate->hw_value;
	rate_fb_ofdm = b43_is_ofdm_rate(rate_fb);

	if (rate_ofdm)
		txhdr->phy_rate = b43_plcp_get_ratecode_ofdm(rate);
	else
		txhdr->phy_rate = b43_plcp_get_ratecode_cck(rate);
	txhdr->mac_frame_ctl = wlhdr->frame_control;
	memcpy(txhdr->tx_receiver, wlhdr->addr1, 6);

	/* Calculate duration for fallback rate */
	if ((rate_fb == rate) ||
	    (wlhdr->duration_id & cpu_to_le16(0x8000)) ||
	    (wlhdr->duration_id == cpu_to_le16(0))) {
		/* If the fallback rate equals the normal rate or the
		 * dur_id field contains an AID, CFP magic or 0,
		 * use the original dur_id field. */
		txhdr->dur_fb = wlhdr->duration_id;
	} else {
		txhdr->dur_fb = ieee80211_generic_frame_duration(
			dev->wl->hw, info->control.vif, fragment_len, fbrate);
	}

	plcp_fragment_len = fragment_len + FCS_LEN;
	if (use_encryption) {
		u8 key_idx = info->control.hw_key->hw_key_idx;
		struct b43_key *key;
		int wlhdr_len;
		size_t iv_len;

		B43_WARN_ON(key_idx >= dev->max_nr_keys);
		key = &(dev->key[key_idx]);

		if (unlikely(!key->keyconf)) {
			/* This key is invalid. This might only happen
			 * in a short timeframe after machine resume before
			 * we were able to reconfigure keys.
			 * Drop this packet completely. Do not transmit it
			 * unencrypted to avoid leaking information. */
			return -ENOKEY;
		}

		/* Hardware appends ICV. */
		plcp_fragment_len += info->control.hw_key->icv_len;

		key_idx = b43_kidx_to_fw(dev, key_idx);
		mac_ctl |= (key_idx << B43_TXH_MAC_KEYIDX_SHIFT) &
			   B43_TXH_MAC_KEYIDX;
		mac_ctl |= (key->algorithm << B43_TXH_MAC_KEYALG_SHIFT) &
			   B43_TXH_MAC_KEYALG;
		wlhdr_len = ieee80211_hdrlen(fctl);
		iv_len = min((size_t) info->control.hw_key->iv_len,
			     ARRAY_SIZE(txhdr->iv));
		memcpy(txhdr->iv, ((u8 *) wlhdr) + wlhdr_len, iv_len);
	}
	if (b43_is_old_txhdr_format(dev)) {
		b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->old_format.plcp),
				      plcp_fragment_len, rate);
	} else {
		b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->new_format.plcp),
				      plcp_fragment_len, rate);
	}
	b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->plcp_fb),
			      plcp_fragment_len, rate_fb);

	/* Extra Frame Types */
	if (rate_fb_ofdm)
		extra_ft |= B43_TXH_EFT_FB_OFDM;
	else
		extra_ft |= B43_TXH_EFT_FB_CCK;

	/* Set channel radio code. Note that the micrcode ORs 0x100 to
	 * this value before comparing it to the value in SHM, if this
	 * is a 5Ghz packet.
	 */
	txhdr->chan_radio_code = phy->channel;

	/* PHY TX Control word */
	if (rate_ofdm)
		phy_ctl |= B43_TXH_PHY_ENC_OFDM;
	else
		phy_ctl |= B43_TXH_PHY_ENC_CCK;
	if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
		phy_ctl |= B43_TXH_PHY_SHORTPRMBL;

	switch (b43_ieee80211_antenna_sanitize(dev, info->antenna_sel_tx)) {
	case 0: /* Default */
		phy_ctl |= B43_TXH_PHY_ANT01AUTO;
		break;
	case 1: /* Antenna 0 */
		phy_ctl |= B43_TXH_PHY_ANT0;
		break;
	case 2: /* Antenna 1 */
		phy_ctl |= B43_TXH_PHY_ANT1;
		break;
	case 3: /* Antenna 2 */
		phy_ctl |= B43_TXH_PHY_ANT2;
		break;
	case 4: /* Antenna 3 */
		phy_ctl |= B43_TXH_PHY_ANT3;
		break;
	default:
		B43_WARN_ON(1);
	}

	rates = info->control.rates;
	/* MAC control */
	if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
		mac_ctl |= B43_TXH_MAC_ACK;
	/* use hardware sequence counter as the non-TID counter */
	if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
		mac_ctl |= B43_TXH_MAC_HWSEQ;
	if (info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)
		mac_ctl |= B43_TXH_MAC_STMSDU;
	if (phy->type == B43_PHYTYPE_A)
		mac_ctl |= B43_TXH_MAC_5GHZ;

	/* Overwrite rates[0].count to make the retry calculation
	 * in the tx status easier. need the actual retry limit to
	 * detect whether the fallback rate was used.
	 */
	if ((rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
	    (rates[0].count <= dev->wl->hw->conf.long_frame_max_tx_count)) {
		rates[0].count = dev->wl->hw->conf.long_frame_max_tx_count;
		mac_ctl |= B43_TXH_MAC_LONGFRAME;
	} else {
		rates[0].count = dev->wl->hw->conf.short_frame_max_tx_count;
	}

	/* Generate the RTS or CTS-to-self frame */
	if ((rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
	    (rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) {
		unsigned int len;
		struct ieee80211_hdr *hdr;
		int rts_rate, rts_rate_fb;
		int rts_rate_ofdm, rts_rate_fb_ofdm;
		struct b43_plcp_hdr6 *plcp;
		struct ieee80211_rate *rts_cts_rate;

		rts_cts_rate = ieee80211_get_rts_cts_rate(dev->wl->hw, info);

		rts_rate = rts_cts_rate ? rts_cts_rate->hw_value : B43_CCK_RATE_1MB;
		rts_rate_ofdm = b43_is_ofdm_rate(rts_rate);
		rts_rate_fb = b43_calc_fallback_rate(rts_rate);
		rts_rate_fb_ofdm = b43_is_ofdm_rate(rts_rate_fb);

		if (rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
			struct ieee80211_cts *cts;

			if (b43_is_old_txhdr_format(dev)) {
				cts = (struct ieee80211_cts *)
					(txhdr->old_format.rts_frame);
			} else {
				cts = (struct ieee80211_cts *)
					(txhdr->new_format.rts_frame);
			}
			ieee80211_ctstoself_get(dev->wl->hw, info->control.vif,
						fragment_data, fragment_len,
						info, cts);
			mac_ctl |= B43_TXH_MAC_SENDCTS;
			len = sizeof(struct ieee80211_cts);
		} else {
			struct ieee80211_rts *rts;

			if (b43_is_old_txhdr_format(dev)) {
				rts = (struct ieee80211_rts *)
					(txhdr->old_format.rts_frame);
			} else {
				rts = (struct ieee80211_rts *)
					(txhdr->new_format.rts_frame);
			}
			ieee80211_rts_get(dev->wl->hw, info->control.vif,
					  fragment_data, fragment_len,
					  info, rts);
			mac_ctl |= B43_TXH_MAC_SENDRTS;
			len = sizeof(struct ieee80211_rts);
		}
		len += FCS_LEN;

		/* Generate the PLCP headers for the RTS/CTS frame */
		if (b43_is_old_txhdr_format(dev))
			plcp = &txhdr->old_format.rts_plcp;
		else
			plcp = &txhdr->new_format.rts_plcp;
		b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)plcp,
				      len, rts_rate);
		plcp = &txhdr->rts_plcp_fb;
		b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)plcp,
				      len, rts_rate_fb);

		if (b43_is_old_txhdr_format(dev)) {
			hdr = (struct ieee80211_hdr *)
				(&txhdr->old_format.rts_frame);
		} else {
			hdr = (struct ieee80211_hdr *)
				(&txhdr->new_format.rts_frame);
		}
		txhdr->rts_dur_fb = hdr->duration_id;

		if (rts_rate_ofdm) {
			extra_ft |= B43_TXH_EFT_RTS_OFDM;
			txhdr->phy_rate_rts =
			    b43_plcp_get_ratecode_ofdm(rts_rate);
		} else {
			extra_ft |= B43_TXH_EFT_RTS_CCK;
			txhdr->phy_rate_rts =
			    b43_plcp_get_ratecode_cck(rts_rate);
		}
		if (rts_rate_fb_ofdm)
			extra_ft |= B43_TXH_EFT_RTSFB_OFDM;
		else
			extra_ft |= B43_TXH_EFT_RTSFB_CCK;
	}

	/* Magic cookie */
	if (b43_is_old_txhdr_format(dev))
		txhdr->old_format.cookie = cpu_to_le16(cookie);
	else
		txhdr->new_format.cookie = cpu_to_le16(cookie);

	/* Apply the bitfields */
	txhdr->mac_ctl = cpu_to_le32(mac_ctl);
	txhdr->phy_ctl = cpu_to_le16(phy_ctl);
	txhdr->extra_ft = extra_ft;

	return 0;
}

static s8 b43_rssi_postprocess(struct b43_wldev *dev,
			       u8 in_rssi, int ofdm,
			       int adjust_2053, int adjust_2050)
{
	struct b43_phy *phy = &dev->phy;
	struct b43_phy_g *gphy = phy->g;
	s32 tmp;

	switch (phy->radio_ver) {
	case 0x2050:
		if (ofdm) {
			tmp = in_rssi;
			if (tmp > 127)
				tmp -= 256;
			tmp *= 73;
			tmp /= 64;
			if (adjust_2050)
				tmp += 25;
			else
				tmp -= 3;
		} else {
			if (dev->dev->bus->sprom.
			    boardflags_lo & B43_BFL_RSSI) {
				if (in_rssi > 63)
					in_rssi = 63;
				B43_WARN_ON(phy->type != B43_PHYTYPE_G);
				tmp = gphy->nrssi_lt[in_rssi];
				tmp = 31 - tmp;
				tmp *= -131;
				tmp /= 128;
				tmp -= 57;
			} else {
				tmp = in_rssi;
				tmp = 31 - tmp;
				tmp *= -149;
				tmp /= 128;
				tmp -= 68;
			}
			if (phy->type == B43_PHYTYPE_G && adjust_2050)
				tmp += 25;
		}
		break;
	case 0x2060:
		if (in_rssi > 127)
			tmp = in_rssi - 256;
		else
			tmp = in_rssi;
		break;
	default:
		tmp = in_rssi;
		tmp -= 11;
		tmp *= 103;
		tmp /= 64;
		if (adjust_2053)
			tmp -= 109;
		else
			tmp -= 83;
	}

	return (s8) tmp;
}

//TODO
#if 0
static s8 b43_rssinoise_postprocess(struct b43_wldev *dev, u8 in_rssi)
{
	struct b43_phy *phy = &dev->phy;
	s8 ret;

	if (phy->type == B43_PHYTYPE_A) {
		//TODO: Incomplete specs.
		ret = 0;
	} else
		ret = b43_rssi_postprocess(dev, in_rssi, 0, 1, 1);

	return ret;
}
#endif

void b43_rx(struct b43_wldev *dev, struct sk_buff *skb, const void *_rxhdr)
{
	struct ieee80211_rx_status status;
	struct b43_plcp_hdr6 *plcp;
	struct ieee80211_hdr *wlhdr;
	const struct b43_rxhdr_fw4 *rxhdr = _rxhdr;
	__le16 fctl;
	u16 phystat0, phystat3, chanstat, mactime;
	u32 macstat;
	u16 chanid;
	u16 phytype;
	int padding;

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

	/* Get metadata about the frame from the header. */
	phystat0 = le16_to_cpu(rxhdr->phy_status0);
	phystat3 = le16_to_cpu(rxhdr->phy_status3);
	macstat = le32_to_cpu(rxhdr->mac_status);
	mactime = le16_to_cpu(rxhdr->mac_time);
	chanstat = le16_to_cpu(rxhdr->channel);
	phytype = chanstat & B43_RX_CHAN_PHYTYPE;

	if (macstat & B43_RX_MAC_FCSERR)
		dev->wl->ieee_stats.dot11FCSErrorCount++;
	if (macstat & B43_RX_MAC_DECERR) {
		/* Decryption with the given key failed.
		 * Drop the packet. We also won't be able to decrypt it with
		 * the key in software. */
		goto drop;
	}

	/* Skip PLCP and padding */
	padding = (macstat & B43_RX_MAC_PADDING) ? 2 : 0;
	if (unlikely(skb->len < (sizeof(struct b43_plcp_hdr6) + padding))) {
		b43dbg(dev->wl, "RX: Packet size underrun (1)\n");
		goto drop;
	}
	plcp = (struct b43_plcp_hdr6 *)(skb->data + padding);
	skb_pull(skb, sizeof(struct b43_plcp_hdr6) + padding);
	/* The skb contains the Wireless Header + payload data now */
	if (unlikely(skb->len < (2 + 2 + 6 /*minimum hdr */  + FCS_LEN))) {
		b43dbg(dev->wl, "RX: Packet size underrun (2)\n");
		goto drop;
	}
	wlhdr = (struct ieee80211_hdr *)(skb->data);
	fctl = wlhdr->frame_control;

	if (macstat & B43_RX_MAC_DEC) {
		unsigned int keyidx;
		int wlhdr_len;

		keyidx = ((macstat & B43_RX_MAC_KEYIDX)
			  >> B43_RX_MAC_KEYIDX_SHIFT);
		/* We must adjust the key index here. We want the "physical"
		 * key index, but the ucode passed it slightly different.
		 */
		keyidx = b43_kidx_to_raw(dev, keyidx);
		B43_WARN_ON(keyidx >= dev->max_nr_keys);

		if (dev->key[keyidx].algorithm != B43_SEC_ALGO_NONE) {
			wlhdr_len = ieee80211_hdrlen(fctl);
			if (unlikely(skb->len < (wlhdr_len + 3))) {
				b43dbg(dev->wl,
				       "RX: Packet size underrun (3)\n");
				goto drop;
			}
			status.flag |= RX_FLAG_DECRYPTED;
		}
	}

	/* Link quality statistics */
	status.noise = dev->stats.link_noise;
	if ((chanstat & B43_RX_CHAN_PHYTYPE) == B43_PHYTYPE_N) {
//		s8 rssi = max(rxhdr->power0, rxhdr->power1);
		//TODO: Find out what the rssi value is (dBm or percentage?)
		//      and also find out what the maximum possible value is.
		//      Fill status.ssi and status.signal fields.
	} else {
		status.signal = b43_rssi_postprocess(dev, rxhdr->jssi,
						  (phystat0 & B43_RX_PHYST0_OFDM),
						  (phystat0 & B43_RX_PHYST0_GAINCTL),
						  (phystat3 & B43_RX_PHYST3_TRSTATE));
		status.qual = (rxhdr->jssi * 100) / B43_RX_MAX_SSI;
	}

	if (phystat0 & B43_RX_PHYST0_OFDM)
		status.rate_idx = b43_plcp_get_bitrate_idx_ofdm(plcp,
						phytype == B43_PHYTYPE_A);
	else
		status.rate_idx = b43_plcp_get_bitrate_idx_cck(plcp);
	if (unlikely(status.rate_idx == -1))
		goto drop;
	status.antenna = !!(phystat0 & B43_RX_PHYST0_ANT);

	/*
	 * All frames on monitor interfaces and beacons always need a full
	 * 64-bit timestamp. Monitor interfaces need it for diagnostic
	 * purposes and beacons for IBSS merging.
	 * This code assumes we get to process the packet within 16 bits
	 * of timestamp, i.e. about 65 milliseconds after the PHY received
	 * the first symbol.
	 */
	if (ieee80211_is_beacon(fctl) || dev->wl->radiotap_enabled) {
		u16 low_mactime_now;

		b43_tsf_read(dev, &status.mactime);
		low_mactime_now = status.mactime;
		status.mactime = status.mactime & ~0xFFFFULL;
		status.mactime += mactime;
		if (low_mactime_now <= mactime)
			status.mactime -= 0x10000;
		status.flag |= RX_FLAG_TSFT;
	}

	chanid = (chanstat & B43_RX_CHAN_ID) >> B43_RX_CHAN_ID_SHIFT;
	switch (chanstat & B43_RX_CHAN_PHYTYPE) {
	case B43_PHYTYPE_A:
		status.band = IEEE80211_BAND_5GHZ;
		B43_WARN_ON(1);
		/* FIXME: We don't really know which value the "chanid" contains.
		 *        So the following assignment might be wrong. */
		status.freq = b43_channel_to_freq_5ghz(chanid);
		break;
	case B43_PHYTYPE_G:
		status.band = IEEE80211_BAND_2GHZ;
		/* chanid is the radio channel cookie value as used
		 * to tune the radio. */
		status.freq = chanid + 2400;
		break;
	case B43_PHYTYPE_N:
		/* chanid is the SHM channel cookie. Which is the plain
		 * channel number in b43. */
		if (chanstat & B43_RX_CHAN_5GHZ) {
			status.band = IEEE80211_BAND_5GHZ;
			status.freq = b43_freq_to_channel_5ghz(chanid);
		} else {
			status.band = IEEE80211_BAND_2GHZ;
			status.freq = b43_freq_to_channel_2ghz(chanid);
		}
		break;
	default:
		B43_WARN_ON(1);
		goto drop;
	}

	dev->stats.last_rx = jiffies;
	ieee80211_rx_irqsafe(dev->wl->hw, skb, &status);

	return;
drop:
	b43dbg(dev->wl, "RX: Packet dropped\n");
	dev_kfree_skb_any(skb);
}

void b43_handle_txstatus(struct b43_wldev *dev,
			 const struct b43_txstatus *status)
{
	b43_debugfs_log_txstat(dev, status);

	if (status->intermediate)
		return;
	if (status->for_ampdu)
		return;
	if (!status->acked)
		dev->wl->ieee_stats.dot11ACKFailureCount++;
	if (status->rts_count) {
		if (status->rts_count == 0xF)	//FIXME
			dev->wl->ieee_stats.dot11RTSFailureCount++;
		else
			dev->wl->ieee_stats.dot11RTSSuccessCount++;
	}

	if (b43_using_pio_transfers(dev))
		b43_pio_handle_txstatus(dev, status);
	else
		b43_dma_handle_txstatus(dev, status);

	b43_phy_txpower_check(dev, 0);
}

/* Fill out the mac80211 TXstatus report based on the b43-specific
 * txstatus report data. This returns a boolean whether the frame was
 * successfully transmitted. */
bool b43_fill_txstatus_report(struct b43_wldev *dev,
			      struct ieee80211_tx_info *report,
			      const struct b43_txstatus *status)
{
	bool frame_success = 1;
	int retry_limit;

	/* preserve the confiured retry limit before clearing the status
	 * The xmit function has overwritten the rc's value with the actual
	 * retry limit done by the hardware */
	retry_limit = report->status.rates[0].count;
	ieee80211_tx_info_clear_status(report);

	if (status->acked) {
		/* The frame was ACKed. */
		report->flags |= IEEE80211_TX_STAT_ACK;
	} else {
		/* The frame was not ACKed... */
		if (!(report->flags & IEEE80211_TX_CTL_NO_ACK)) {
			/* ...but we expected an ACK. */
			frame_success = 0;
		}
	}
	if (status->frame_count == 0) {
		/* The frame was not transmitted at all. */
		report->status.rates[0].count = 0;
	} else if (status->rts_count > dev->wl->hw->conf.short_frame_max_tx_count) {
		/*
		 * If the short retries (RTS, not data frame) have exceeded
		 * the limit, the hw will not have tried the selected rate,
		 * but will have used the fallback rate instead.
		 * Don't let the rate control count attempts for the selected
		 * rate in this case, otherwise the statistics will be off.
		 */
		report->status.rates[0].count = 0;
		report->status.rates[1].count = status->frame_count;
	} else {
		if (status->frame_count > retry_limit) {
			report->status.rates[0].count = retry_limit;
			report->status.rates[1].count = status->frame_count -
					retry_limit;

		} else {
			report->status.rates[0].count = status->frame_count;
			report->status.rates[1].idx = -1;
		}
	}

	return frame_success;
}

/* Stop any TX operation on the device (suspend the hardware queues) */
void b43_tx_suspend(struct b43_wldev *dev)
{
	if (b43_using_pio_transfers(dev))
		b43_pio_tx_suspend(dev);
	else
		b43_dma_tx_suspend(dev);
}

/* Resume any TX operation on the device (resume the hardware queues) */
void b43_tx_resume(struct b43_wldev *dev)
{
	if (b43_using_pio_transfers(dev))
		b43_pio_tx_resume(dev);
	else
		b43_dma_tx_resume(dev);
}