xref: /linux/drivers/net/wireless/ralink/rt2x00/rt2x00mac.c (revision ebf68996de0ab250c5d520eb2291ab65643e9a1e)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 	Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
4 	<http://rt2x00.serialmonkey.com>
5 
6  */
7 
8 /*
9 	Module: rt2x00mac
10 	Abstract: rt2x00 generic mac80211 routines.
11  */
12 
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 
16 #include "rt2x00.h"
17 #include "rt2x00lib.h"
18 
19 static int rt2x00mac_tx_rts_cts(struct rt2x00_dev *rt2x00dev,
20 				struct data_queue *queue,
21 				struct sk_buff *frag_skb)
22 {
23 	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(frag_skb);
24 	struct ieee80211_tx_info *rts_info;
25 	struct sk_buff *skb;
26 	unsigned int data_length;
27 	int retval = 0;
28 
29 	if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
30 		data_length = sizeof(struct ieee80211_cts);
31 	else
32 		data_length = sizeof(struct ieee80211_rts);
33 
34 	skb = dev_alloc_skb(data_length + rt2x00dev->hw->extra_tx_headroom);
35 	if (unlikely(!skb)) {
36 		rt2x00_warn(rt2x00dev, "Failed to create RTS/CTS frame\n");
37 		return -ENOMEM;
38 	}
39 
40 	skb_reserve(skb, rt2x00dev->hw->extra_tx_headroom);
41 	skb_put(skb, data_length);
42 
43 	/*
44 	 * Copy TX information over from original frame to
45 	 * RTS/CTS frame. Note that we set the no encryption flag
46 	 * since we don't want this frame to be encrypted.
47 	 * RTS frames should be acked, while CTS-to-self frames
48 	 * should not. The ready for TX flag is cleared to prevent
49 	 * it being automatically send when the descriptor is
50 	 * written to the hardware.
51 	 */
52 	memcpy(skb->cb, frag_skb->cb, sizeof(skb->cb));
53 	rts_info = IEEE80211_SKB_CB(skb);
54 	rts_info->control.rates[0].flags &= ~IEEE80211_TX_RC_USE_RTS_CTS;
55 	rts_info->control.rates[0].flags &= ~IEEE80211_TX_RC_USE_CTS_PROTECT;
56 
57 	if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
58 		rts_info->flags |= IEEE80211_TX_CTL_NO_ACK;
59 	else
60 		rts_info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
61 
62 	/* Disable hardware encryption */
63 	rts_info->control.hw_key = NULL;
64 
65 	/*
66 	 * RTS/CTS frame should use the length of the frame plus any
67 	 * encryption overhead that will be added by the hardware.
68 	 */
69 	data_length += rt2x00crypto_tx_overhead(rt2x00dev, skb);
70 
71 	if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
72 		ieee80211_ctstoself_get(rt2x00dev->hw, tx_info->control.vif,
73 					frag_skb->data, data_length, tx_info,
74 					(struct ieee80211_cts *)(skb->data));
75 	else
76 		ieee80211_rts_get(rt2x00dev->hw, tx_info->control.vif,
77 				  frag_skb->data, data_length, tx_info,
78 				  (struct ieee80211_rts *)(skb->data));
79 
80 	retval = rt2x00queue_write_tx_frame(queue, skb, NULL, true);
81 	if (retval) {
82 		dev_kfree_skb_any(skb);
83 		rt2x00_warn(rt2x00dev, "Failed to send RTS/CTS frame\n");
84 	}
85 
86 	return retval;
87 }
88 
89 void rt2x00mac_tx(struct ieee80211_hw *hw,
90 		  struct ieee80211_tx_control *control,
91 		  struct sk_buff *skb)
92 {
93 	struct rt2x00_dev *rt2x00dev = hw->priv;
94 	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
95 	enum data_queue_qid qid = skb_get_queue_mapping(skb);
96 	struct data_queue *queue = NULL;
97 
98 	/*
99 	 * Mac80211 might be calling this function while we are trying
100 	 * to remove the device or perhaps suspending it.
101 	 * Note that we can only stop the TX queues inside the TX path
102 	 * due to possible race conditions in mac80211.
103 	 */
104 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
105 		goto exit_free_skb;
106 
107 	/*
108 	 * Use the ATIM queue if appropriate and present.
109 	 */
110 	if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM &&
111 	    rt2x00_has_cap_flag(rt2x00dev, REQUIRE_ATIM_QUEUE))
112 		qid = QID_ATIM;
113 
114 	queue = rt2x00queue_get_tx_queue(rt2x00dev, qid);
115 	if (unlikely(!queue)) {
116 		rt2x00_err(rt2x00dev,
117 			   "Attempt to send packet over invalid queue %d\n"
118 			   "Please file bug report to %s\n", qid, DRV_PROJECT);
119 		goto exit_free_skb;
120 	}
121 
122 	/*
123 	 * If CTS/RTS is required. create and queue that frame first.
124 	 * Make sure we have at least enough entries available to send
125 	 * this CTS/RTS frame as well as the data frame.
126 	 * Note that when the driver has set the set_rts_threshold()
127 	 * callback function it doesn't need software generation of
128 	 * either RTS or CTS-to-self frame and handles everything
129 	 * inside the hardware.
130 	 */
131 	if (!rt2x00dev->ops->hw->set_rts_threshold &&
132 	    (tx_info->control.rates[0].flags & (IEEE80211_TX_RC_USE_RTS_CTS |
133 						IEEE80211_TX_RC_USE_CTS_PROTECT))) {
134 		if (rt2x00queue_available(queue) <= 1) {
135 			/*
136 			 * Recheck for full queue under lock to avoid race
137 			 * conditions with rt2x00lib_txdone().
138 			 */
139 			spin_lock(&queue->tx_lock);
140 			if (rt2x00queue_threshold(queue))
141 				rt2x00queue_pause_queue(queue);
142 			spin_unlock(&queue->tx_lock);
143 
144 			goto exit_free_skb;
145 		}
146 
147 		if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb))
148 			goto exit_free_skb;
149 	}
150 
151 	if (unlikely(rt2x00queue_write_tx_frame(queue, skb, control->sta, false)))
152 		goto exit_free_skb;
153 
154 	return;
155 
156  exit_free_skb:
157 	ieee80211_free_txskb(hw, skb);
158 }
159 EXPORT_SYMBOL_GPL(rt2x00mac_tx);
160 
161 int rt2x00mac_start(struct ieee80211_hw *hw)
162 {
163 	struct rt2x00_dev *rt2x00dev = hw->priv;
164 
165 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
166 		return 0;
167 
168 	return rt2x00lib_start(rt2x00dev);
169 }
170 EXPORT_SYMBOL_GPL(rt2x00mac_start);
171 
172 void rt2x00mac_stop(struct ieee80211_hw *hw)
173 {
174 	struct rt2x00_dev *rt2x00dev = hw->priv;
175 
176 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
177 		return;
178 
179 	rt2x00lib_stop(rt2x00dev);
180 }
181 EXPORT_SYMBOL_GPL(rt2x00mac_stop);
182 
183 int rt2x00mac_add_interface(struct ieee80211_hw *hw,
184 			    struct ieee80211_vif *vif)
185 {
186 	struct rt2x00_dev *rt2x00dev = hw->priv;
187 	struct rt2x00_intf *intf = vif_to_intf(vif);
188 	struct data_queue *queue = rt2x00dev->bcn;
189 	struct queue_entry *entry = NULL;
190 	unsigned int i;
191 
192 	/*
193 	 * Don't allow interfaces to be added
194 	 * the device has disappeared.
195 	 */
196 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
197 	    !test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
198 		return -ENODEV;
199 
200 	/*
201 	 * Loop through all beacon queues to find a free
202 	 * entry. Since there are as much beacon entries
203 	 * as the maximum interfaces, this search shouldn't
204 	 * fail.
205 	 */
206 	for (i = 0; i < queue->limit; i++) {
207 		entry = &queue->entries[i];
208 		if (!test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
209 			break;
210 	}
211 
212 	if (unlikely(i == queue->limit))
213 		return -ENOBUFS;
214 
215 	/*
216 	 * We are now absolutely sure the interface can be created,
217 	 * increase interface count and start initialization.
218 	 */
219 
220 	if (vif->type == NL80211_IFTYPE_AP)
221 		rt2x00dev->intf_ap_count++;
222 	else
223 		rt2x00dev->intf_sta_count++;
224 
225 	mutex_init(&intf->beacon_skb_mutex);
226 	intf->beacon = entry;
227 
228 	/*
229 	 * The MAC address must be configured after the device
230 	 * has been initialized. Otherwise the device can reset
231 	 * the MAC registers.
232 	 * The BSSID address must only be configured in AP mode,
233 	 * however we should not send an empty BSSID address for
234 	 * STA interfaces at this time, since this can cause
235 	 * invalid behavior in the device.
236 	 */
237 	rt2x00lib_config_intf(rt2x00dev, intf, vif->type,
238 			      vif->addr, NULL);
239 
240 	/*
241 	 * Some filters depend on the current working mode. We can force
242 	 * an update during the next configure_filter() run by mac80211 by
243 	 * resetting the current packet_filter state.
244 	 */
245 	rt2x00dev->packet_filter = 0;
246 
247 	return 0;
248 }
249 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
250 
251 void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
252 				struct ieee80211_vif *vif)
253 {
254 	struct rt2x00_dev *rt2x00dev = hw->priv;
255 	struct rt2x00_intf *intf = vif_to_intf(vif);
256 
257 	/*
258 	 * Don't allow interfaces to be remove while
259 	 * either the device has disappeared or when
260 	 * no interface is present.
261 	 */
262 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
263 	    (vif->type == NL80211_IFTYPE_AP && !rt2x00dev->intf_ap_count) ||
264 	    (vif->type != NL80211_IFTYPE_AP && !rt2x00dev->intf_sta_count))
265 		return;
266 
267 	if (vif->type == NL80211_IFTYPE_AP)
268 		rt2x00dev->intf_ap_count--;
269 	else
270 		rt2x00dev->intf_sta_count--;
271 
272 	/*
273 	 * Release beacon entry so it is available for
274 	 * new interfaces again.
275 	 */
276 	clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);
277 
278 	/*
279 	 * Make sure the bssid and mac address registers
280 	 * are cleared to prevent false ACKing of frames.
281 	 */
282 	rt2x00lib_config_intf(rt2x00dev, intf,
283 			      NL80211_IFTYPE_UNSPECIFIED, NULL, NULL);
284 }
285 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
286 
287 int rt2x00mac_config(struct ieee80211_hw *hw, u32 changed)
288 {
289 	struct rt2x00_dev *rt2x00dev = hw->priv;
290 	struct ieee80211_conf *conf = &hw->conf;
291 
292 	/*
293 	 * mac80211 might be calling this function while we are trying
294 	 * to remove the device or perhaps suspending it.
295 	 */
296 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
297 		return 0;
298 
299 	/*
300 	 * Some configuration parameters (e.g. channel and antenna values) can
301 	 * only be set when the radio is enabled, but do require the RX to
302 	 * be off. During this period we should keep link tuning enabled,
303 	 * if for any reason the link tuner must be reset, this will be
304 	 * handled by rt2x00lib_config().
305 	 */
306 	rt2x00queue_stop_queue(rt2x00dev->rx);
307 
308 	/* Do not race with with link tuner. */
309 	mutex_lock(&rt2x00dev->conf_mutex);
310 
311 	/*
312 	 * When we've just turned on the radio, we want to reprogram
313 	 * everything to ensure a consistent state
314 	 */
315 	rt2x00lib_config(rt2x00dev, conf, changed);
316 
317 	/*
318 	 * After the radio has been enabled we need to configure
319 	 * the antenna to the default settings. rt2x00lib_config_antenna()
320 	 * should determine if any action should be taken based on
321 	 * checking if diversity has been enabled or no antenna changes
322 	 * have been made since the last configuration change.
323 	 */
324 	rt2x00lib_config_antenna(rt2x00dev, rt2x00dev->default_ant);
325 
326 	mutex_unlock(&rt2x00dev->conf_mutex);
327 
328 	/* Turn RX back on */
329 	rt2x00queue_start_queue(rt2x00dev->rx);
330 
331 	return 0;
332 }
333 EXPORT_SYMBOL_GPL(rt2x00mac_config);
334 
335 void rt2x00mac_configure_filter(struct ieee80211_hw *hw,
336 				unsigned int changed_flags,
337 				unsigned int *total_flags,
338 				u64 multicast)
339 {
340 	struct rt2x00_dev *rt2x00dev = hw->priv;
341 
342 	/*
343 	 * Mask off any flags we are going to ignore
344 	 * from the total_flags field.
345 	 */
346 	*total_flags &=
347 	    FIF_ALLMULTI |
348 	    FIF_FCSFAIL |
349 	    FIF_PLCPFAIL |
350 	    FIF_CONTROL |
351 	    FIF_PSPOLL |
352 	    FIF_OTHER_BSS;
353 
354 	/*
355 	 * Apply some rules to the filters:
356 	 * - Some filters imply different filters to be set.
357 	 * - Some things we can't filter out at all.
358 	 * - Multicast filter seems to kill broadcast traffic so never use it.
359 	 */
360 	*total_flags |= FIF_ALLMULTI;
361 
362 	/*
363 	 * If the device has a single filter for all control frames,
364 	 * FIF_CONTROL and FIF_PSPOLL flags imply each other.
365 	 * And if the device has more than one filter for control frames
366 	 * of different types, but has no a separate filter for PS Poll frames,
367 	 * FIF_CONTROL flag implies FIF_PSPOLL.
368 	 */
369 	if (!rt2x00_has_cap_control_filters(rt2x00dev)) {
370 		if (*total_flags & FIF_CONTROL || *total_flags & FIF_PSPOLL)
371 			*total_flags |= FIF_CONTROL | FIF_PSPOLL;
372 	}
373 	if (!rt2x00_has_cap_control_filter_pspoll(rt2x00dev)) {
374 		if (*total_flags & FIF_CONTROL)
375 			*total_flags |= FIF_PSPOLL;
376 	}
377 
378 	rt2x00dev->packet_filter = *total_flags;
379 
380 	rt2x00dev->ops->lib->config_filter(rt2x00dev, *total_flags);
381 }
382 EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter);
383 
384 static void rt2x00mac_set_tim_iter(void *data, u8 *mac,
385 				   struct ieee80211_vif *vif)
386 {
387 	struct rt2x00_intf *intf = vif_to_intf(vif);
388 
389 	if (vif->type != NL80211_IFTYPE_AP &&
390 	    vif->type != NL80211_IFTYPE_ADHOC &&
391 	    vif->type != NL80211_IFTYPE_MESH_POINT &&
392 	    vif->type != NL80211_IFTYPE_WDS)
393 		return;
394 
395 	set_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags);
396 }
397 
398 int rt2x00mac_set_tim(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
399 		      bool set)
400 {
401 	struct rt2x00_dev *rt2x00dev = hw->priv;
402 
403 	if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
404 		return 0;
405 
406 	ieee80211_iterate_active_interfaces_atomic(
407 		rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
408 		rt2x00mac_set_tim_iter, rt2x00dev);
409 
410 	/* queue work to upodate the beacon template */
411 	ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->intf_work);
412 	return 0;
413 }
414 EXPORT_SYMBOL_GPL(rt2x00mac_set_tim);
415 
416 #ifdef CONFIG_RT2X00_LIB_CRYPTO
417 static void memcpy_tkip(struct rt2x00lib_crypto *crypto, u8 *key, u8 key_len)
418 {
419 	if (key_len > NL80211_TKIP_DATA_OFFSET_ENCR_KEY)
420 		memcpy(crypto->key,
421 		       &key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY],
422 		       sizeof(crypto->key));
423 
424 	if (key_len > NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY)
425 		memcpy(crypto->tx_mic,
426 		       &key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY],
427 		       sizeof(crypto->tx_mic));
428 
429 	if (key_len > NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY)
430 		memcpy(crypto->rx_mic,
431 		       &key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY],
432 		       sizeof(crypto->rx_mic));
433 }
434 
435 int rt2x00mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
436 		      struct ieee80211_vif *vif, struct ieee80211_sta *sta,
437 		      struct ieee80211_key_conf *key)
438 {
439 	struct rt2x00_dev *rt2x00dev = hw->priv;
440 	int (*set_key) (struct rt2x00_dev *rt2x00dev,
441 			struct rt2x00lib_crypto *crypto,
442 			struct ieee80211_key_conf *key);
443 	struct rt2x00lib_crypto crypto;
444 	static const u8 bcast_addr[ETH_ALEN] =
445 		{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, };
446 	struct rt2x00_sta *sta_priv = NULL;
447 
448 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
449 		return 0;
450 
451 	if (!rt2x00_has_cap_hw_crypto(rt2x00dev))
452 		return -EOPNOTSUPP;
453 
454 	/*
455 	 * To support IBSS RSN, don't program group keys in IBSS, the
456 	 * hardware will then not attempt to decrypt the frames.
457 	 */
458 	if (vif->type == NL80211_IFTYPE_ADHOC &&
459 	    !(key->flags & IEEE80211_KEY_FLAG_PAIRWISE))
460 		return -EOPNOTSUPP;
461 
462 	if (key->keylen > 32)
463 		return -ENOSPC;
464 
465 	memset(&crypto, 0, sizeof(crypto));
466 
467 	crypto.bssidx = rt2x00lib_get_bssidx(rt2x00dev, vif);
468 	crypto.cipher = rt2x00crypto_key_to_cipher(key);
469 	if (crypto.cipher == CIPHER_NONE)
470 		return -EOPNOTSUPP;
471 	if (crypto.cipher == CIPHER_TKIP && rt2x00_is_usb(rt2x00dev))
472 		return -EOPNOTSUPP;
473 
474 	crypto.cmd = cmd;
475 
476 	if (sta) {
477 		crypto.address = sta->addr;
478 		sta_priv = sta_to_rt2x00_sta(sta);
479 		crypto.wcid = sta_priv->wcid;
480 	} else
481 		crypto.address = bcast_addr;
482 
483 	if (crypto.cipher == CIPHER_TKIP)
484 		memcpy_tkip(&crypto, &key->key[0], key->keylen);
485 	else
486 		memcpy(crypto.key, &key->key[0], key->keylen);
487 	/*
488 	 * Each BSS has a maximum of 4 shared keys.
489 	 * Shared key index values:
490 	 *	0) BSS0 key0
491 	 *	1) BSS0 key1
492 	 *	...
493 	 *	4) BSS1 key0
494 	 *	...
495 	 *	8) BSS2 key0
496 	 *	...
497 	 * Both pairwise as shared key indeces are determined by
498 	 * driver. This is required because the hardware requires
499 	 * keys to be assigned in correct order (When key 1 is
500 	 * provided but key 0 is not, then the key is not found
501 	 * by the hardware during RX).
502 	 */
503 	if (cmd == SET_KEY)
504 		key->hw_key_idx = 0;
505 
506 	if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
507 		set_key = rt2x00dev->ops->lib->config_pairwise_key;
508 	else
509 		set_key = rt2x00dev->ops->lib->config_shared_key;
510 
511 	if (!set_key)
512 		return -EOPNOTSUPP;
513 
514 	return set_key(rt2x00dev, &crypto, key);
515 }
516 EXPORT_SYMBOL_GPL(rt2x00mac_set_key);
517 #endif /* CONFIG_RT2X00_LIB_CRYPTO */
518 
519 void rt2x00mac_sw_scan_start(struct ieee80211_hw *hw,
520 			     struct ieee80211_vif *vif,
521 			     const u8 *mac_addr)
522 {
523 	struct rt2x00_dev *rt2x00dev = hw->priv;
524 	set_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
525 	rt2x00link_stop_tuner(rt2x00dev);
526 }
527 EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_start);
528 
529 void rt2x00mac_sw_scan_complete(struct ieee80211_hw *hw,
530 				struct ieee80211_vif *vif)
531 {
532 	struct rt2x00_dev *rt2x00dev = hw->priv;
533 	clear_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
534 	rt2x00link_start_tuner(rt2x00dev);
535 }
536 EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_complete);
537 
538 int rt2x00mac_get_stats(struct ieee80211_hw *hw,
539 			struct ieee80211_low_level_stats *stats)
540 {
541 	struct rt2x00_dev *rt2x00dev = hw->priv;
542 
543 	/*
544 	 * The dot11ACKFailureCount, dot11RTSFailureCount and
545 	 * dot11RTSSuccessCount are updated in interrupt time.
546 	 * dot11FCSErrorCount is updated in the link tuner.
547 	 */
548 	memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
549 
550 	return 0;
551 }
552 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
553 
554 void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
555 				struct ieee80211_vif *vif,
556 				struct ieee80211_bss_conf *bss_conf,
557 				u32 changes)
558 {
559 	struct rt2x00_dev *rt2x00dev = hw->priv;
560 	struct rt2x00_intf *intf = vif_to_intf(vif);
561 
562 	/*
563 	 * mac80211 might be calling this function while we are trying
564 	 * to remove the device or perhaps suspending it.
565 	 */
566 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
567 		return;
568 
569 	/*
570 	 * Update the BSSID.
571 	 */
572 	if (changes & BSS_CHANGED_BSSID)
573 		rt2x00lib_config_intf(rt2x00dev, intf, vif->type, NULL,
574 				      bss_conf->bssid);
575 
576 	/*
577 	 * Start/stop beaconing.
578 	 */
579 	if (changes & BSS_CHANGED_BEACON_ENABLED) {
580 		mutex_lock(&intf->beacon_skb_mutex);
581 		if (!bss_conf->enable_beacon && intf->enable_beacon) {
582 			rt2x00dev->intf_beaconing--;
583 			intf->enable_beacon = false;
584 
585 			if (rt2x00dev->intf_beaconing == 0) {
586 				/*
587 				 * Last beaconing interface disabled
588 				 * -> stop beacon queue.
589 				 */
590 				rt2x00queue_stop_queue(rt2x00dev->bcn);
591 			}
592 			/*
593 			 * Clear beacon in the H/W for this vif. This is needed
594 			 * to disable beaconing on this particular interface
595 			 * and keep it running on other interfaces.
596 			 */
597 			rt2x00queue_clear_beacon(rt2x00dev, vif);
598 		} else if (bss_conf->enable_beacon && !intf->enable_beacon) {
599 			rt2x00dev->intf_beaconing++;
600 			intf->enable_beacon = true;
601 			/*
602 			 * Upload beacon to the H/W. This is only required on
603 			 * USB devices. PCI devices fetch beacons periodically.
604 			 */
605 			if (rt2x00_is_usb(rt2x00dev))
606 				rt2x00queue_update_beacon(rt2x00dev, vif);
607 
608 			if (rt2x00dev->intf_beaconing == 1) {
609 				/*
610 				 * First beaconing interface enabled
611 				 * -> start beacon queue.
612 				 */
613 				rt2x00queue_start_queue(rt2x00dev->bcn);
614 			}
615 		}
616 		mutex_unlock(&intf->beacon_skb_mutex);
617 	}
618 
619 	/*
620 	 * When the association status has changed we must reset the link
621 	 * tuner counter. This is because some drivers determine if they
622 	 * should perform link tuning based on the number of seconds
623 	 * while associated or not associated.
624 	 */
625 	if (changes & BSS_CHANGED_ASSOC) {
626 		rt2x00dev->link.count = 0;
627 
628 		if (bss_conf->assoc)
629 			rt2x00dev->intf_associated++;
630 		else
631 			rt2x00dev->intf_associated--;
632 
633 		rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
634 	}
635 
636 	/*
637 	 * When the erp information has changed, we should perform
638 	 * additional configuration steps. For all other changes we are done.
639 	 */
640 	if (changes & (BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE |
641 		       BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BASIC_RATES |
642 		       BSS_CHANGED_BEACON_INT | BSS_CHANGED_HT))
643 		rt2x00lib_config_erp(rt2x00dev, intf, bss_conf, changes);
644 }
645 EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
646 
647 int rt2x00mac_conf_tx(struct ieee80211_hw *hw,
648 		      struct ieee80211_vif *vif, u16 queue_idx,
649 		      const struct ieee80211_tx_queue_params *params)
650 {
651 	struct rt2x00_dev *rt2x00dev = hw->priv;
652 	struct data_queue *queue;
653 
654 	queue = rt2x00queue_get_tx_queue(rt2x00dev, queue_idx);
655 	if (unlikely(!queue))
656 		return -EINVAL;
657 
658 	/*
659 	 * The passed variables are stored as real value ((2^n)-1).
660 	 * Ralink registers require to know the bit number 'n'.
661 	 */
662 	if (params->cw_min > 0)
663 		queue->cw_min = fls(params->cw_min);
664 	else
665 		queue->cw_min = 5; /* cw_min: 2^5 = 32. */
666 
667 	if (params->cw_max > 0)
668 		queue->cw_max = fls(params->cw_max);
669 	else
670 		queue->cw_max = 10; /* cw_min: 2^10 = 1024. */
671 
672 	queue->aifs = params->aifs;
673 	queue->txop = params->txop;
674 
675 	rt2x00_dbg(rt2x00dev,
676 		   "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d, TXop: %d\n",
677 		   queue_idx, queue->cw_min, queue->cw_max, queue->aifs,
678 		   queue->txop);
679 
680 	return 0;
681 }
682 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);
683 
684 void rt2x00mac_rfkill_poll(struct ieee80211_hw *hw)
685 {
686 	struct rt2x00_dev *rt2x00dev = hw->priv;
687 	bool active = !!rt2x00dev->ops->lib->rfkill_poll(rt2x00dev);
688 
689 	wiphy_rfkill_set_hw_state(hw->wiphy, !active);
690 }
691 EXPORT_SYMBOL_GPL(rt2x00mac_rfkill_poll);
692 
693 void rt2x00mac_flush(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
694 		     u32 queues, bool drop)
695 {
696 	struct rt2x00_dev *rt2x00dev = hw->priv;
697 	struct data_queue *queue;
698 
699 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
700 		return;
701 
702 	set_bit(DEVICE_STATE_FLUSHING, &rt2x00dev->flags);
703 
704 	tx_queue_for_each(rt2x00dev, queue)
705 		rt2x00queue_flush_queue(queue, drop);
706 
707 	clear_bit(DEVICE_STATE_FLUSHING, &rt2x00dev->flags);
708 }
709 EXPORT_SYMBOL_GPL(rt2x00mac_flush);
710 
711 int rt2x00mac_set_antenna(struct ieee80211_hw *hw, u32 tx_ant, u32 rx_ant)
712 {
713 	struct rt2x00_dev *rt2x00dev = hw->priv;
714 	struct link_ant *ant = &rt2x00dev->link.ant;
715 	struct antenna_setup *def = &rt2x00dev->default_ant;
716 	struct antenna_setup setup;
717 
718 	// The antenna value is not supposed to be 0,
719 	// or exceed the maximum number of antenna's.
720 	if (!tx_ant || (tx_ant & ~3) || !rx_ant || (rx_ant & ~3))
721 		return -EINVAL;
722 
723 	// When the client tried to configure the antenna to or from
724 	// diversity mode, we must reset the default antenna as well
725 	// as that controls the diversity switch.
726 	if (ant->flags & ANTENNA_TX_DIVERSITY && tx_ant != 3)
727 		ant->flags &= ~ANTENNA_TX_DIVERSITY;
728 	if (ant->flags & ANTENNA_RX_DIVERSITY && rx_ant != 3)
729 		ant->flags &= ~ANTENNA_RX_DIVERSITY;
730 
731 	// If diversity is being enabled, check if we need hardware
732 	// or software diversity. In the latter case, reset the value,
733 	// and make sure we update the antenna flags to have the
734 	// link tuner pick up the diversity tuning.
735 	if (tx_ant == 3 && def->tx == ANTENNA_SW_DIVERSITY) {
736 		tx_ant = ANTENNA_SW_DIVERSITY;
737 		ant->flags |= ANTENNA_TX_DIVERSITY;
738 	}
739 
740 	if (rx_ant == 3 && def->rx == ANTENNA_SW_DIVERSITY) {
741 		rx_ant = ANTENNA_SW_DIVERSITY;
742 		ant->flags |= ANTENNA_RX_DIVERSITY;
743 	}
744 
745 	setup.tx = tx_ant;
746 	setup.rx = rx_ant;
747 	setup.rx_chain_num = 0;
748 	setup.tx_chain_num = 0;
749 
750 	rt2x00lib_config_antenna(rt2x00dev, setup);
751 
752 	return 0;
753 }
754 EXPORT_SYMBOL_GPL(rt2x00mac_set_antenna);
755 
756 int rt2x00mac_get_antenna(struct ieee80211_hw *hw, u32 *tx_ant, u32 *rx_ant)
757 {
758 	struct rt2x00_dev *rt2x00dev = hw->priv;
759 	struct link_ant *ant = &rt2x00dev->link.ant;
760 	struct antenna_setup *active = &rt2x00dev->link.ant.active;
761 
762 	// When software diversity is active, we must report this to the
763 	// client and not the current active antenna state.
764 	if (ant->flags & ANTENNA_TX_DIVERSITY)
765 		*tx_ant = ANTENNA_HW_DIVERSITY;
766 	else
767 		*tx_ant = active->tx;
768 
769 	if (ant->flags & ANTENNA_RX_DIVERSITY)
770 		*rx_ant = ANTENNA_HW_DIVERSITY;
771 	else
772 		*rx_ant = active->rx;
773 
774 	return 0;
775 }
776 EXPORT_SYMBOL_GPL(rt2x00mac_get_antenna);
777 
778 void rt2x00mac_get_ringparam(struct ieee80211_hw *hw,
779 			     u32 *tx, u32 *tx_max, u32 *rx, u32 *rx_max)
780 {
781 	struct rt2x00_dev *rt2x00dev = hw->priv;
782 	struct data_queue *queue;
783 
784 	tx_queue_for_each(rt2x00dev, queue) {
785 		*tx += queue->length;
786 		*tx_max += queue->limit;
787 	}
788 
789 	*rx = rt2x00dev->rx->length;
790 	*rx_max = rt2x00dev->rx->limit;
791 }
792 EXPORT_SYMBOL_GPL(rt2x00mac_get_ringparam);
793 
794 bool rt2x00mac_tx_frames_pending(struct ieee80211_hw *hw)
795 {
796 	struct rt2x00_dev *rt2x00dev = hw->priv;
797 	struct data_queue *queue;
798 
799 	tx_queue_for_each(rt2x00dev, queue) {
800 		if (!rt2x00queue_empty(queue))
801 			return true;
802 	}
803 
804 	return false;
805 }
806 EXPORT_SYMBOL_GPL(rt2x00mac_tx_frames_pending);
807