summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/purelifi/plfxlc/mac.c
blob: 641f847d47ab080e6ff8fa5c4445f98306a0c142 (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2021 pureLiFi
 */

#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/jiffies.h>
#include <net/ieee80211_radiotap.h>

#include "chip.h"
#include "mac.h"
#include "usb.h"

static const struct ieee80211_rate plfxlc_rates[] = {
	{ .bitrate = 10,
		.hw_value = PURELIFI_CCK_RATE_1M,
		.flags = 0 },
	{ .bitrate = 20,
		.hw_value = PURELIFI_CCK_RATE_2M,
		.hw_value_short = PURELIFI_CCK_RATE_2M
			| PURELIFI_CCK_PREA_SHORT,
		.flags = IEEE80211_RATE_SHORT_PREAMBLE },
	{ .bitrate = 55,
		.hw_value = PURELIFI_CCK_RATE_5_5M,
		.hw_value_short = PURELIFI_CCK_RATE_5_5M
			| PURELIFI_CCK_PREA_SHORT,
		.flags = IEEE80211_RATE_SHORT_PREAMBLE },
	{ .bitrate = 110,
		.hw_value = PURELIFI_CCK_RATE_11M,
		.hw_value_short = PURELIFI_CCK_RATE_11M
			| PURELIFI_CCK_PREA_SHORT,
		.flags = IEEE80211_RATE_SHORT_PREAMBLE },
	{ .bitrate = 60,
		.hw_value = PURELIFI_OFDM_RATE_6M,
		.flags = 0 },
	{ .bitrate = 90,
		.hw_value = PURELIFI_OFDM_RATE_9M,
		.flags = 0 },
	{ .bitrate = 120,
		.hw_value = PURELIFI_OFDM_RATE_12M,
		.flags = 0 },
	{ .bitrate = 180,
		.hw_value = PURELIFI_OFDM_RATE_18M,
		.flags = 0 },
	{ .bitrate = 240,
		.hw_value = PURELIFI_OFDM_RATE_24M,
		.flags = 0 },
	{ .bitrate = 360,
		.hw_value = PURELIFI_OFDM_RATE_36M,
		.flags = 0 },
	{ .bitrate = 480,
		.hw_value = PURELIFI_OFDM_RATE_48M,
		.flags = 0 },
	{ .bitrate = 540,
		.hw_value = PURELIFI_OFDM_RATE_54M,
		.flags = 0 }
};

static const struct ieee80211_channel plfxlc_channels[] = {
	{ .center_freq = 2412, .hw_value = 1 },
	{ .center_freq = 2417, .hw_value = 2 },
	{ .center_freq = 2422, .hw_value = 3 },
	{ .center_freq = 2427, .hw_value = 4 },
	{ .center_freq = 2432, .hw_value = 5 },
	{ .center_freq = 2437, .hw_value = 6 },
	{ .center_freq = 2442, .hw_value = 7 },
	{ .center_freq = 2447, .hw_value = 8 },
	{ .center_freq = 2452, .hw_value = 9 },
	{ .center_freq = 2457, .hw_value = 10 },
	{ .center_freq = 2462, .hw_value = 11 },
	{ .center_freq = 2467, .hw_value = 12 },
	{ .center_freq = 2472, .hw_value = 13 },
	{ .center_freq = 2484, .hw_value = 14 },
};

int plfxlc_mac_preinit_hw(struct ieee80211_hw *hw, const u8 *hw_address)
{
	SET_IEEE80211_PERM_ADDR(hw, hw_address);
	return 0;
}

int plfxlc_mac_init_hw(struct ieee80211_hw *hw)
{
	struct plfxlc_mac *mac = plfxlc_hw_mac(hw);
	struct plfxlc_chip *chip = &mac->chip;
	int r;

	r = plfxlc_chip_init_hw(chip);
	if (r) {
		dev_warn(plfxlc_mac_dev(mac), "init hw failed (%d)\n", r);
		return r;
	}

	dev_dbg(plfxlc_mac_dev(mac), "irq_disabled (%d)\n", irqs_disabled());
	regulatory_hint(hw->wiphy, "00");
	return r;
}

void plfxlc_mac_release(struct plfxlc_mac *mac)
{
	plfxlc_chip_release(&mac->chip);
	lockdep_assert_held(&mac->lock);
}

int plfxlc_op_start(struct ieee80211_hw *hw)
{
	plfxlc_hw_mac(hw)->chip.usb.initialized = 1;
	return 0;
}

void plfxlc_op_stop(struct ieee80211_hw *hw)
{
	struct plfxlc_mac *mac = plfxlc_hw_mac(hw);

	clear_bit(PURELIFI_DEVICE_RUNNING, &mac->flags);
}

int plfxlc_restore_settings(struct plfxlc_mac *mac)
{
	int beacon_interval, beacon_period;
	struct sk_buff *beacon;

	spin_lock_irq(&mac->lock);
	beacon_interval = mac->beacon.interval;
	beacon_period = mac->beacon.period;
	spin_unlock_irq(&mac->lock);

	if (mac->type != NL80211_IFTYPE_ADHOC)
		return 0;

	if (mac->vif) {
		beacon = ieee80211_beacon_get(mac->hw, mac->vif, 0);
		if (beacon) {
			/*beacon is hardcoded in firmware */
			kfree_skb(beacon);
			/* Returned skb is used only once and lowlevel
			 * driver is responsible for freeing it.
			 */
		}
	}

	plfxlc_set_beacon_interval(&mac->chip, beacon_interval,
				   beacon_period, mac->type);

	spin_lock_irq(&mac->lock);
	mac->beacon.last_update = jiffies;
	spin_unlock_irq(&mac->lock);

	return 0;
}

static void plfxlc_mac_tx_status(struct ieee80211_hw *hw,
				 struct sk_buff *skb,
				 int ackssi,
				 struct tx_status *tx_status)
{
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	int success = 1;

	ieee80211_tx_info_clear_status(info);
	if (tx_status)
		success = !tx_status->failure;

	if (success)
		info->flags |= IEEE80211_TX_STAT_ACK;
	else
		info->flags &= ~IEEE80211_TX_STAT_ACK;

	info->status.ack_signal = 50;
	ieee80211_tx_status_irqsafe(hw, skb);
}

void plfxlc_mac_tx_to_dev(struct sk_buff *skb, int error)
{
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_hw *hw = info->rate_driver_data[0];
	struct plfxlc_mac *mac = plfxlc_hw_mac(hw);
	struct sk_buff_head *q = NULL;

	ieee80211_tx_info_clear_status(info);
	skb_pull(skb, sizeof(struct plfxlc_ctrlset));

	if (unlikely(error ||
		     (info->flags & IEEE80211_TX_CTL_NO_ACK))) {
		ieee80211_tx_status_irqsafe(hw, skb);
		return;
	}

	q = &mac->ack_wait_queue;

	skb_queue_tail(q, skb);
	while (skb_queue_len(q)/* > PURELIFI_MAC_MAX_ACK_WAITERS*/) {
		plfxlc_mac_tx_status(hw, skb_dequeue(q),
				     mac->ack_pending ?
				     mac->ack_signal : 0,
				     NULL);
		mac->ack_pending = 0;
	}
}

static int plfxlc_fill_ctrlset(struct plfxlc_mac *mac, struct sk_buff *skb)
{
	unsigned int frag_len = skb->len;
	struct plfxlc_ctrlset *cs;
	u32 temp_payload_len = 0;
	unsigned int tmp;
	u32 temp_len = 0;

	if (skb_headroom(skb) < sizeof(struct plfxlc_ctrlset)) {
		dev_dbg(plfxlc_mac_dev(mac), "Not enough hroom(1)\n");
		return 1;
	}

	cs = (void *)skb_push(skb, sizeof(struct plfxlc_ctrlset));
	temp_payload_len = frag_len;
	temp_len = temp_payload_len +
		  sizeof(struct plfxlc_ctrlset) -
		  sizeof(cs->id) - sizeof(cs->len);

	/* Data packet lengths must be multiple of four bytes and must
	 * not be a multiple of 512 bytes. First, it is attempted to
	 * append the data packet in the tailroom of the skb. In rare
	 * occasions, the tailroom is too small. In this case, the
	 * content of the packet is shifted into the headroom of the skb
	 * by memcpy. Headroom is allocated at startup (below in this
	 * file). Therefore, there will be always enough headroom. The
	 * call skb_headroom is an additional safety which might be
	 * dropped.
	 */
	/* check if 32 bit aligned and align data */
	tmp = skb->len & 3;
	if (tmp) {
		if (skb_tailroom(skb) < (3 - tmp)) {
			if (skb_headroom(skb) >= 4 - tmp) {
				u8 len;
				u8 *src_pt;
				u8 *dest_pt;

				len = skb->len;
				src_pt = skb->data;
				dest_pt = skb_push(skb, 4 - tmp);
				memmove(dest_pt, src_pt, len);
			} else {
				return -ENOBUFS;
			}
		} else {
			skb_put(skb, 4 - tmp);
		}
		temp_len += 4 - tmp;
	}

	/* check if not multiple of 512 and align data */
	tmp = skb->len & 0x1ff;
	if (!tmp) {
		if (skb_tailroom(skb) < 4) {
			if (skb_headroom(skb) >= 4) {
				u8 len = skb->len;
				u8 *src_pt = skb->data;
				u8 *dest_pt = skb_push(skb, 4);

				memmove(dest_pt, src_pt, len);
			} else {
				/* should never happen because
				 * sufficient headroom was reserved
				 */
				return -ENOBUFS;
			}
		} else {
			skb_put(skb, 4);
		}
		temp_len += 4;
	}

	cs->id = cpu_to_be32(USB_REQ_DATA_TX);
	cs->len = cpu_to_be32(temp_len);
	cs->payload_len_nw = cpu_to_be32(temp_payload_len);

	return 0;
}

static void plfxlc_op_tx(struct ieee80211_hw *hw,
			 struct ieee80211_tx_control *control,
			 struct sk_buff *skb)
{
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct plfxlc_header *plhdr = (void *)skb->data;
	struct plfxlc_mac *mac = plfxlc_hw_mac(hw);
	struct plfxlc_usb *usb = &mac->chip.usb;
	unsigned long flags;
	int r;

	r = plfxlc_fill_ctrlset(mac, skb);
	if (r)
		goto fail;

	info->rate_driver_data[0] = hw;

	if (plhdr->frametype  == IEEE80211_FTYPE_DATA) {
		u8 *dst_mac = plhdr->dmac;
		u8 sidx;
		bool found = false;
		struct plfxlc_usb_tx *tx = &usb->tx;

		for (sidx = 0; sidx < MAX_STA_NUM; sidx++) {
			if (!(tx->station[sidx].flag & STATION_CONNECTED_FLAG))
				continue;
			if (memcmp(tx->station[sidx].mac, dst_mac, ETH_ALEN))
				continue;
			found = true;
			break;
		}

		/* Default to broadcast address for unknown MACs */
		if (!found)
			sidx = STA_BROADCAST_INDEX;

		/* Stop OS from sending packets, if the queue is half full */
		if (skb_queue_len(&tx->station[sidx].data_list) > 60)
			ieee80211_stop_queues(plfxlc_usb_to_hw(usb));

		/* Schedule packet for transmission if queue is not full */
		if (skb_queue_len(&tx->station[sidx].data_list) > 256)
			goto fail;
		skb_queue_tail(&tx->station[sidx].data_list, skb);
		plfxlc_send_packet_from_data_queue(usb);

	} else {
		spin_lock_irqsave(&usb->tx.lock, flags);
		r = plfxlc_usb_wreq_async(&mac->chip.usb, skb->data, skb->len,
					  USB_REQ_DATA_TX, plfxlc_tx_urb_complete, skb);
		spin_unlock_irqrestore(&usb->tx.lock, flags);
		if (r)
			goto fail;
	}
	return;

fail:
	dev_kfree_skb(skb);
}

static int plfxlc_filter_ack(struct ieee80211_hw *hw, struct ieee80211_hdr *rx_hdr,
			     struct ieee80211_rx_status *stats)
{
	struct plfxlc_mac *mac = plfxlc_hw_mac(hw);
	struct sk_buff_head *q;
	int i, position = 0;
	unsigned long flags;
	struct sk_buff *skb;
	bool found = false;

	if (!ieee80211_is_ack(rx_hdr->frame_control))
		return 0;

	dev_dbg(plfxlc_mac_dev(mac), "ACK Received\n");

	/* code based on zy driver, this logic may need fix */
	q = &mac->ack_wait_queue;
	spin_lock_irqsave(&q->lock, flags);

	skb_queue_walk(q, skb) {
		struct ieee80211_hdr *tx_hdr;

		position++;

		if (mac->ack_pending && skb_queue_is_first(q, skb))
			continue;
		if (mac->ack_pending == 0)
			break;

		tx_hdr = (struct ieee80211_hdr *)skb->data;
		if (likely(ether_addr_equal(tx_hdr->addr2, rx_hdr->addr1))) {
			found = 1;
			break;
		}
	}

	if (found) {
		for (i = 1; i < position; i++)
			skb = __skb_dequeue(q);
		if (i == position) {
			plfxlc_mac_tx_status(hw, skb,
					     mac->ack_pending ?
					     mac->ack_signal : 0,
					     NULL);
			mac->ack_pending = 0;
		}

		mac->ack_pending = skb_queue_len(q) ? 1 : 0;
		mac->ack_signal = stats->signal;
	}

	spin_unlock_irqrestore(&q->lock, flags);
	return 1;
}

int plfxlc_mac_rx(struct ieee80211_hw *hw, const u8 *buffer,
		  unsigned int length)
{
	struct plfxlc_mac *mac = plfxlc_hw_mac(hw);
	struct ieee80211_rx_status stats;
	const struct rx_status *status;
	unsigned int payload_length;
	struct plfxlc_usb_tx *tx;
	struct sk_buff *skb;
	int need_padding;
	__le16 fc;
	int sidx;

	/* Packet blockade during disabled interface. */
	if (!mac->vif)
		return 0;

	status = (struct rx_status *)buffer;

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

	stats.flag     = 0;
	stats.freq     = 2412;
	stats.band     = NL80211_BAND_LC;
	mac->rssi      = -15 * be16_to_cpu(status->rssi) / 10;

	stats.signal   = mac->rssi;

	if (status->rate_idx > 7)
		stats.rate_idx = 0;
	else
		stats.rate_idx = status->rate_idx;

	mac->crc_errors = be64_to_cpu(status->crc_error_count);

	/* TODO bad frame check for CRC error*/
	if (plfxlc_filter_ack(hw, (struct ieee80211_hdr *)buffer, &stats) &&
	    !mac->pass_ctrl)
		return 0;

	buffer += sizeof(struct rx_status);
	payload_length = get_unaligned_be32(buffer);

	if (payload_length > 1560) {
		dev_err(plfxlc_mac_dev(mac), " > MTU %u\n", payload_length);
		return 0;
	}
	buffer += sizeof(u32);

	fc = get_unaligned((__le16 *)buffer);
	need_padding = ieee80211_is_data_qos(fc) ^ ieee80211_has_a4(fc);

	tx = &mac->chip.usb.tx;

	for (sidx = 0; sidx < MAX_STA_NUM - 1; sidx++) {
		if (memcmp(&buffer[10], tx->station[sidx].mac, ETH_ALEN))
			continue;
		if (tx->station[sidx].flag & STATION_CONNECTED_FLAG) {
			tx->station[sidx].flag |= STATION_HEARTBEAT_FLAG;
			break;
		}
	}

	if (sidx == MAX_STA_NUM - 1) {
		for (sidx = 0; sidx < MAX_STA_NUM - 1; sidx++) {
			if (tx->station[sidx].flag & STATION_CONNECTED_FLAG)
				continue;
			memcpy(tx->station[sidx].mac, &buffer[10], ETH_ALEN);
			tx->station[sidx].flag |= STATION_CONNECTED_FLAG;
			tx->station[sidx].flag |= STATION_HEARTBEAT_FLAG;
			break;
		}
	}

	switch (buffer[0]) {
	case IEEE80211_STYPE_PROBE_REQ:
		dev_dbg(plfxlc_mac_dev(mac), "Probe request\n");
		break;
	case IEEE80211_STYPE_ASSOC_REQ:
		dev_dbg(plfxlc_mac_dev(mac), "Association request\n");
		break;
	case IEEE80211_STYPE_AUTH:
		dev_dbg(plfxlc_mac_dev(mac), "Authentication req\n");
		break;
	case IEEE80211_FTYPE_DATA:
		dev_dbg(plfxlc_mac_dev(mac), "802.11 data frame\n");
		break;
	}

	skb = dev_alloc_skb(payload_length + (need_padding ? 2 : 0));
	if (!skb)
		return -ENOMEM;

	if (need_padding)
		/* Make sure that the payload data is 4 byte aligned. */
		skb_reserve(skb, 2);

	skb_put_data(skb, buffer, payload_length);
	memcpy(IEEE80211_SKB_RXCB(skb), &stats, sizeof(stats));
	ieee80211_rx_irqsafe(hw, skb);
	return 0;
}

static int plfxlc_op_add_interface(struct ieee80211_hw *hw,
				   struct ieee80211_vif *vif)
{
	struct plfxlc_mac *mac = plfxlc_hw_mac(hw);
	static const char * const iftype80211[] = {
		[NL80211_IFTYPE_STATION]	= "Station",
		[NL80211_IFTYPE_ADHOC]		= "Adhoc"
	};

	if (mac->type != NL80211_IFTYPE_UNSPECIFIED)
		return -EOPNOTSUPP;

	if (vif->type == NL80211_IFTYPE_ADHOC ||
	    vif->type == NL80211_IFTYPE_STATION) {
		dev_dbg(plfxlc_mac_dev(mac), "%s %s\n", __func__,
			iftype80211[vif->type]);
		mac->type = vif->type;
		mac->vif = vif;
		return 0;
	}
	dev_dbg(plfxlc_mac_dev(mac), "unsupported iftype\n");
	return -EOPNOTSUPP;
}

static void plfxlc_op_remove_interface(struct ieee80211_hw *hw,
				       struct ieee80211_vif *vif)
{
	struct plfxlc_mac *mac = plfxlc_hw_mac(hw);

	mac->type = NL80211_IFTYPE_UNSPECIFIED;
	mac->vif = NULL;
}

static int plfxlc_op_config(struct ieee80211_hw *hw, u32 changed)
{
	return 0;
}

#define SUPPORTED_FIF_FLAGS \
	(FIF_ALLMULTI | FIF_FCSFAIL | FIF_CONTROL | \
	 FIF_OTHER_BSS | FIF_BCN_PRBRESP_PROMISC)
static void plfxlc_op_configure_filter(struct ieee80211_hw *hw,
				       unsigned int changed_flags,
				       unsigned int *new_flags,
				       u64 multicast)
{
	struct plfxlc_mc_hash hash = {
		.low = multicast,
		.high = multicast >> 32,
	};
	struct plfxlc_mac *mac = plfxlc_hw_mac(hw);
	unsigned long flags;

	/* Only deal with supported flags */
	*new_flags &= SUPPORTED_FIF_FLAGS;

	/* If multicast parameter
	 * (as returned by plfxlc_op_prepare_multicast)
	 * has changed, no bit in changed_flags is set. To handle this
	 * situation, we do not return if changed_flags is 0. If we do so,
	 * we will have some issue with IPv6 which uses multicast for link
	 * layer address resolution.
	 */
	if (*new_flags & (FIF_ALLMULTI))
		plfxlc_mc_add_all(&hash);

	spin_lock_irqsave(&mac->lock, flags);
	mac->pass_failed_fcs = !!(*new_flags & FIF_FCSFAIL);
	mac->pass_ctrl = !!(*new_flags & FIF_CONTROL);
	mac->multicast_hash = hash;
	spin_unlock_irqrestore(&mac->lock, flags);

	/* no handling required for FIF_OTHER_BSS as we don't currently
	 * do BSSID filtering
	 */
	/* FIXME: in future it would be nice to enable the probe response
	 * filter (so that the driver doesn't see them) until
	 * FIF_BCN_PRBRESP_PROMISC is set. however due to atomicity here, we'd
	 * have to schedule work to enable prbresp reception, which might
	 * happen too late. For now we'll just listen and forward them all the
	 * time.
	 */
}

static void plfxlc_op_bss_info_changed(struct ieee80211_hw *hw,
				       struct ieee80211_vif *vif,
				       struct ieee80211_bss_conf *bss_conf,
				       u64 changes)
{
	struct plfxlc_mac *mac = plfxlc_hw_mac(hw);
	int associated;

	dev_dbg(plfxlc_mac_dev(mac), "changes: %llx\n", changes);

	if (mac->type != NL80211_IFTYPE_ADHOC) { /* for STATION */
		associated = is_valid_ether_addr(bss_conf->bssid);
		goto exit_all;
	}
	/* for ADHOC */
	associated = true;
	if (changes & BSS_CHANGED_BEACON) {
		struct sk_buff *beacon = ieee80211_beacon_get(hw, vif, 0);

		if (beacon) {
			/*beacon is hardcoded in firmware */
			kfree_skb(beacon);
			/*Returned skb is used only once and
			 * low-level driver is
			 * responsible for freeing it.
			 */
		}
	}

	if (changes & BSS_CHANGED_BEACON_ENABLED) {
		u16 interval = 0;
		u8 period = 0;

		if (bss_conf->enable_beacon) {
			period = bss_conf->dtim_period;
			interval = bss_conf->beacon_int;
		}

		spin_lock_irq(&mac->lock);
		mac->beacon.period = period;
		mac->beacon.interval = interval;
		mac->beacon.last_update = jiffies;
		spin_unlock_irq(&mac->lock);

		plfxlc_set_beacon_interval(&mac->chip, interval,
					   period, mac->type);
	}
exit_all:
	spin_lock_irq(&mac->lock);
	mac->associated = associated;
	spin_unlock_irq(&mac->lock);
}

static int plfxlc_get_stats(struct ieee80211_hw *hw,
			    struct ieee80211_low_level_stats *stats)
{
	stats->dot11ACKFailureCount = 0;
	stats->dot11RTSFailureCount = 0;
	stats->dot11FCSErrorCount   = 0;
	stats->dot11RTSSuccessCount = 0;
	return 0;
}

static const char et_strings[][ETH_GSTRING_LEN] = {
	"phy_rssi",
	"phy_rx_crc_err"
};

static int plfxlc_get_et_sset_count(struct ieee80211_hw *hw,
				    struct ieee80211_vif *vif, int sset)
{
	if (sset == ETH_SS_STATS)
		return ARRAY_SIZE(et_strings);

	return 0;
}

static void plfxlc_get_et_strings(struct ieee80211_hw *hw,
				  struct ieee80211_vif *vif,
				  u32 sset, u8 *data)
{
	if (sset == ETH_SS_STATS)
		memcpy(data, et_strings, sizeof(et_strings));
}

static void plfxlc_get_et_stats(struct ieee80211_hw *hw,
				struct ieee80211_vif *vif,
				struct ethtool_stats *stats, u64 *data)
{
	struct plfxlc_mac *mac = plfxlc_hw_mac(hw);

	data[0] = mac->rssi;
	data[1] = mac->crc_errors;
}

static int plfxlc_set_rts_threshold(struct ieee80211_hw *hw, u32 value)
{
	return 0;
}

static const struct ieee80211_ops plfxlc_ops = {
	.add_chanctx = ieee80211_emulate_add_chanctx,
	.remove_chanctx = ieee80211_emulate_remove_chanctx,
	.change_chanctx = ieee80211_emulate_change_chanctx,
	.switch_vif_chanctx = ieee80211_emulate_switch_vif_chanctx,
	.tx = plfxlc_op_tx,
	.wake_tx_queue = ieee80211_handle_wake_tx_queue,
	.start = plfxlc_op_start,
	.stop = plfxlc_op_stop,
	.add_interface = plfxlc_op_add_interface,
	.remove_interface = plfxlc_op_remove_interface,
	.set_rts_threshold = plfxlc_set_rts_threshold,
	.config = plfxlc_op_config,
	.configure_filter = plfxlc_op_configure_filter,
	.bss_info_changed = plfxlc_op_bss_info_changed,
	.get_stats = plfxlc_get_stats,
	.get_et_sset_count = plfxlc_get_et_sset_count,
	.get_et_stats = plfxlc_get_et_stats,
	.get_et_strings = plfxlc_get_et_strings,
};

struct ieee80211_hw *plfxlc_mac_alloc_hw(struct usb_interface *intf)
{
	struct ieee80211_hw *hw;
	struct plfxlc_mac *mac;

	hw = ieee80211_alloc_hw(sizeof(struct plfxlc_mac), &plfxlc_ops);
	if (!hw) {
		dev_dbg(&intf->dev, "out of memory\n");
		return NULL;
	}
	set_wiphy_dev(hw->wiphy, &intf->dev);

	mac = plfxlc_hw_mac(hw);
	memset(mac, 0, sizeof(*mac));
	spin_lock_init(&mac->lock);
	mac->hw = hw;

	mac->type = NL80211_IFTYPE_UNSPECIFIED;

	memcpy(mac->channels, plfxlc_channels, sizeof(plfxlc_channels));
	memcpy(mac->rates, plfxlc_rates, sizeof(plfxlc_rates));
	mac->band.n_bitrates = ARRAY_SIZE(plfxlc_rates);
	mac->band.bitrates = mac->rates;
	mac->band.n_channels = ARRAY_SIZE(plfxlc_channels);
	mac->band.channels = mac->channels;
	hw->wiphy->bands[NL80211_BAND_LC] = &mac->band;
	hw->conf.chandef.width = NL80211_CHAN_WIDTH_20;

	ieee80211_hw_set(hw, RX_INCLUDES_FCS);
	ieee80211_hw_set(hw, SIGNAL_DBM);
	ieee80211_hw_set(hw, HOST_BROADCAST_PS_BUFFERING);
	ieee80211_hw_set(hw, MFP_CAPABLE);

	hw->wiphy->interface_modes =
		BIT(NL80211_IFTYPE_STATION) |
		BIT(NL80211_IFTYPE_ADHOC);
	hw->max_signal = 100;
	hw->queues = 1;
	/* 4 for 32 bit alignment if no tailroom */
	hw->extra_tx_headroom = sizeof(struct plfxlc_ctrlset) + 4;
	/* Tell mac80211 that we support multi rate retries */
	hw->max_rates = IEEE80211_TX_MAX_RATES;
	hw->max_rate_tries = 18;   /* 9 rates * 2 retries/rate */

	skb_queue_head_init(&mac->ack_wait_queue);
	mac->ack_pending = 0;

	plfxlc_chip_init(&mac->chip, hw, intf);

	SET_IEEE80211_DEV(hw, &intf->dev);
	return hw;
}