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 	if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags)) {
169 		/*
170 		 * This is special case for ieee80211_restart_hw(), otherwise
171 		 * mac80211 never call start() two times in row without stop();
172 		 */
173 		set_bit(DEVICE_STATE_RESET, &rt2x00dev->flags);
174 		rt2x00dev->ops->lib->pre_reset_hw(rt2x00dev);
175 		rt2x00lib_stop(rt2x00dev);
176 	}
177 	return rt2x00lib_start(rt2x00dev);
178 }
179 EXPORT_SYMBOL_GPL(rt2x00mac_start);
180 
181 void rt2x00mac_stop(struct ieee80211_hw *hw)
182 {
183 	struct rt2x00_dev *rt2x00dev = hw->priv;
184 
185 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
186 		return;
187 
188 	rt2x00lib_stop(rt2x00dev);
189 }
190 EXPORT_SYMBOL_GPL(rt2x00mac_stop);
191 
192 void
193 rt2x00mac_reconfig_complete(struct ieee80211_hw *hw,
194 			    enum ieee80211_reconfig_type reconfig_type)
195 {
196 	struct rt2x00_dev *rt2x00dev = hw->priv;
197 
198 	if (reconfig_type == IEEE80211_RECONFIG_TYPE_RESTART)
199 		clear_bit(DEVICE_STATE_RESET, &rt2x00dev->flags);
200 }
201 EXPORT_SYMBOL_GPL(rt2x00mac_reconfig_complete);
202 
203 int rt2x00mac_add_interface(struct ieee80211_hw *hw,
204 			    struct ieee80211_vif *vif)
205 {
206 	struct rt2x00_dev *rt2x00dev = hw->priv;
207 	struct rt2x00_intf *intf = vif_to_intf(vif);
208 	struct data_queue *queue = rt2x00dev->bcn;
209 	struct queue_entry *entry = NULL;
210 	unsigned int i;
211 
212 	/*
213 	 * Don't allow interfaces to be added
214 	 * the device has disappeared.
215 	 */
216 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
217 	    !test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
218 		return -ENODEV;
219 
220 	/*
221 	 * Loop through all beacon queues to find a free
222 	 * entry. Since there are as much beacon entries
223 	 * as the maximum interfaces, this search shouldn't
224 	 * fail.
225 	 */
226 	for (i = 0; i < queue->limit; i++) {
227 		entry = &queue->entries[i];
228 		if (!test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
229 			break;
230 	}
231 
232 	if (unlikely(i == queue->limit))
233 		return -ENOBUFS;
234 
235 	/*
236 	 * We are now absolutely sure the interface can be created,
237 	 * increase interface count and start initialization.
238 	 */
239 
240 	if (vif->type == NL80211_IFTYPE_AP)
241 		rt2x00dev->intf_ap_count++;
242 	else
243 		rt2x00dev->intf_sta_count++;
244 
245 	mutex_init(&intf->beacon_skb_mutex);
246 	intf->beacon = entry;
247 
248 	/*
249 	 * The MAC address must be configured after the device
250 	 * has been initialized. Otherwise the device can reset
251 	 * the MAC registers.
252 	 * The BSSID address must only be configured in AP mode,
253 	 * however we should not send an empty BSSID address for
254 	 * STA interfaces at this time, since this can cause
255 	 * invalid behavior in the device.
256 	 */
257 	rt2x00lib_config_intf(rt2x00dev, intf, vif->type,
258 			      vif->addr, NULL);
259 
260 	/*
261 	 * Some filters depend on the current working mode. We can force
262 	 * an update during the next configure_filter() run by mac80211 by
263 	 * resetting the current packet_filter state.
264 	 */
265 	rt2x00dev->packet_filter = 0;
266 
267 	return 0;
268 }
269 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
270 
271 void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
272 				struct ieee80211_vif *vif)
273 {
274 	struct rt2x00_dev *rt2x00dev = hw->priv;
275 	struct rt2x00_intf *intf = vif_to_intf(vif);
276 
277 	/*
278 	 * Don't allow interfaces to be remove while
279 	 * either the device has disappeared or when
280 	 * no interface is present.
281 	 */
282 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
283 	    (vif->type == NL80211_IFTYPE_AP && !rt2x00dev->intf_ap_count) ||
284 	    (vif->type != NL80211_IFTYPE_AP && !rt2x00dev->intf_sta_count))
285 		return;
286 
287 	if (vif->type == NL80211_IFTYPE_AP)
288 		rt2x00dev->intf_ap_count--;
289 	else
290 		rt2x00dev->intf_sta_count--;
291 
292 	/*
293 	 * Release beacon entry so it is available for
294 	 * new interfaces again.
295 	 */
296 	clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);
297 
298 	/*
299 	 * Make sure the bssid and mac address registers
300 	 * are cleared to prevent false ACKing of frames.
301 	 */
302 	rt2x00lib_config_intf(rt2x00dev, intf,
303 			      NL80211_IFTYPE_UNSPECIFIED, NULL, NULL);
304 }
305 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
306 
307 int rt2x00mac_config(struct ieee80211_hw *hw, u32 changed)
308 {
309 	struct rt2x00_dev *rt2x00dev = hw->priv;
310 	struct ieee80211_conf *conf = &hw->conf;
311 
312 	/*
313 	 * mac80211 might be calling this function while we are trying
314 	 * to remove the device or perhaps suspending it.
315 	 */
316 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
317 		return 0;
318 
319 	/*
320 	 * Some configuration parameters (e.g. channel and antenna values) can
321 	 * only be set when the radio is enabled, but do require the RX to
322 	 * be off. During this period we should keep link tuning enabled,
323 	 * if for any reason the link tuner must be reset, this will be
324 	 * handled by rt2x00lib_config().
325 	 */
326 	rt2x00queue_stop_queue(rt2x00dev->rx);
327 
328 	/* Do not race with with link tuner. */
329 	mutex_lock(&rt2x00dev->conf_mutex);
330 
331 	/*
332 	 * When we've just turned on the radio, we want to reprogram
333 	 * everything to ensure a consistent state
334 	 */
335 	rt2x00lib_config(rt2x00dev, conf, changed);
336 
337 	/*
338 	 * After the radio has been enabled we need to configure
339 	 * the antenna to the default settings. rt2x00lib_config_antenna()
340 	 * should determine if any action should be taken based on
341 	 * checking if diversity has been enabled or no antenna changes
342 	 * have been made since the last configuration change.
343 	 */
344 	rt2x00lib_config_antenna(rt2x00dev, rt2x00dev->default_ant);
345 
346 	mutex_unlock(&rt2x00dev->conf_mutex);
347 
348 	/* Turn RX back on */
349 	rt2x00queue_start_queue(rt2x00dev->rx);
350 
351 	return 0;
352 }
353 EXPORT_SYMBOL_GPL(rt2x00mac_config);
354 
355 void rt2x00mac_configure_filter(struct ieee80211_hw *hw,
356 				unsigned int changed_flags,
357 				unsigned int *total_flags,
358 				u64 multicast)
359 {
360 	struct rt2x00_dev *rt2x00dev = hw->priv;
361 
362 	/*
363 	 * Mask off any flags we are going to ignore
364 	 * from the total_flags field.
365 	 */
366 	*total_flags &=
367 	    FIF_ALLMULTI |
368 	    FIF_FCSFAIL |
369 	    FIF_PLCPFAIL |
370 	    FIF_CONTROL |
371 	    FIF_PSPOLL |
372 	    FIF_OTHER_BSS;
373 
374 	/*
375 	 * Apply some rules to the filters:
376 	 * - Some filters imply different filters to be set.
377 	 * - Some things we can't filter out at all.
378 	 * - Multicast filter seems to kill broadcast traffic so never use it.
379 	 */
380 	*total_flags |= FIF_ALLMULTI;
381 
382 	/*
383 	 * If the device has a single filter for all control frames,
384 	 * FIF_CONTROL and FIF_PSPOLL flags imply each other.
385 	 * And if the device has more than one filter for control frames
386 	 * of different types, but has no a separate filter for PS Poll frames,
387 	 * FIF_CONTROL flag implies FIF_PSPOLL.
388 	 */
389 	if (!rt2x00_has_cap_control_filters(rt2x00dev)) {
390 		if (*total_flags & FIF_CONTROL || *total_flags & FIF_PSPOLL)
391 			*total_flags |= FIF_CONTROL | FIF_PSPOLL;
392 	}
393 	if (!rt2x00_has_cap_control_filter_pspoll(rt2x00dev)) {
394 		if (*total_flags & FIF_CONTROL)
395 			*total_flags |= FIF_PSPOLL;
396 	}
397 
398 	rt2x00dev->packet_filter = *total_flags;
399 
400 	rt2x00dev->ops->lib->config_filter(rt2x00dev, *total_flags);
401 }
402 EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter);
403 
404 static void rt2x00mac_set_tim_iter(void *data, u8 *mac,
405 				   struct ieee80211_vif *vif)
406 {
407 	struct rt2x00_intf *intf = vif_to_intf(vif);
408 
409 	if (vif->type != NL80211_IFTYPE_AP &&
410 	    vif->type != NL80211_IFTYPE_ADHOC &&
411 	    vif->type != NL80211_IFTYPE_MESH_POINT)
412 		return;
413 
414 	set_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags);
415 }
416 
417 int rt2x00mac_set_tim(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
418 		      bool set)
419 {
420 	struct rt2x00_dev *rt2x00dev = hw->priv;
421 
422 	if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
423 		return 0;
424 
425 	ieee80211_iterate_active_interfaces_atomic(
426 		rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
427 		rt2x00mac_set_tim_iter, rt2x00dev);
428 
429 	/* queue work to upodate the beacon template */
430 	ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->intf_work);
431 	return 0;
432 }
433 EXPORT_SYMBOL_GPL(rt2x00mac_set_tim);
434 
435 #ifdef CONFIG_RT2X00_LIB_CRYPTO
436 static void memcpy_tkip(struct rt2x00lib_crypto *crypto, u8 *key, u8 key_len)
437 {
438 	if (key_len > NL80211_TKIP_DATA_OFFSET_ENCR_KEY)
439 		memcpy(crypto->key,
440 		       &key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY],
441 		       sizeof(crypto->key));
442 
443 	if (key_len > NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY)
444 		memcpy(crypto->tx_mic,
445 		       &key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY],
446 		       sizeof(crypto->tx_mic));
447 
448 	if (key_len > NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY)
449 		memcpy(crypto->rx_mic,
450 		       &key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY],
451 		       sizeof(crypto->rx_mic));
452 }
453 
454 int rt2x00mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
455 		      struct ieee80211_vif *vif, struct ieee80211_sta *sta,
456 		      struct ieee80211_key_conf *key)
457 {
458 	struct rt2x00_dev *rt2x00dev = hw->priv;
459 	int (*set_key) (struct rt2x00_dev *rt2x00dev,
460 			struct rt2x00lib_crypto *crypto,
461 			struct ieee80211_key_conf *key);
462 	struct rt2x00lib_crypto crypto;
463 	static const u8 bcast_addr[ETH_ALEN] =
464 		{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, };
465 	struct rt2x00_sta *sta_priv = NULL;
466 
467 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
468 		return 0;
469 
470 	/* The hardware can't do MFP */
471 	if (!rt2x00_has_cap_hw_crypto(rt2x00dev) || (sta && sta->mfp))
472 		return -EOPNOTSUPP;
473 
474 	/*
475 	 * To support IBSS RSN, don't program group keys in IBSS, the
476 	 * hardware will then not attempt to decrypt the frames.
477 	 */
478 	if (vif->type == NL80211_IFTYPE_ADHOC &&
479 	    !(key->flags & IEEE80211_KEY_FLAG_PAIRWISE))
480 		return -EOPNOTSUPP;
481 
482 	if (key->keylen > 32)
483 		return -ENOSPC;
484 
485 	memset(&crypto, 0, sizeof(crypto));
486 
487 	crypto.bssidx = rt2x00lib_get_bssidx(rt2x00dev, vif);
488 	crypto.cipher = rt2x00crypto_key_to_cipher(key);
489 	if (crypto.cipher == CIPHER_NONE)
490 		return -EOPNOTSUPP;
491 	if (crypto.cipher == CIPHER_TKIP && rt2x00_is_usb(rt2x00dev))
492 		return -EOPNOTSUPP;
493 
494 	crypto.cmd = cmd;
495 
496 	if (sta) {
497 		crypto.address = sta->addr;
498 		sta_priv = sta_to_rt2x00_sta(sta);
499 		crypto.wcid = sta_priv->wcid;
500 	} else
501 		crypto.address = bcast_addr;
502 
503 	if (crypto.cipher == CIPHER_TKIP)
504 		memcpy_tkip(&crypto, &key->key[0], key->keylen);
505 	else
506 		memcpy(crypto.key, &key->key[0], key->keylen);
507 	/*
508 	 * Each BSS has a maximum of 4 shared keys.
509 	 * Shared key index values:
510 	 *	0) BSS0 key0
511 	 *	1) BSS0 key1
512 	 *	...
513 	 *	4) BSS1 key0
514 	 *	...
515 	 *	8) BSS2 key0
516 	 *	...
517 	 * Both pairwise as shared key indeces are determined by
518 	 * driver. This is required because the hardware requires
519 	 * keys to be assigned in correct order (When key 1 is
520 	 * provided but key 0 is not, then the key is not found
521 	 * by the hardware during RX).
522 	 */
523 	if (cmd == SET_KEY)
524 		key->hw_key_idx = 0;
525 
526 	if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
527 		set_key = rt2x00dev->ops->lib->config_pairwise_key;
528 	else
529 		set_key = rt2x00dev->ops->lib->config_shared_key;
530 
531 	if (!set_key)
532 		return -EOPNOTSUPP;
533 
534 	return set_key(rt2x00dev, &crypto, key);
535 }
536 EXPORT_SYMBOL_GPL(rt2x00mac_set_key);
537 #endif /* CONFIG_RT2X00_LIB_CRYPTO */
538 
539 void rt2x00mac_sw_scan_start(struct ieee80211_hw *hw,
540 			     struct ieee80211_vif *vif,
541 			     const u8 *mac_addr)
542 {
543 	struct rt2x00_dev *rt2x00dev = hw->priv;
544 	set_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
545 	rt2x00link_stop_tuner(rt2x00dev);
546 }
547 EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_start);
548 
549 void rt2x00mac_sw_scan_complete(struct ieee80211_hw *hw,
550 				struct ieee80211_vif *vif)
551 {
552 	struct rt2x00_dev *rt2x00dev = hw->priv;
553 	clear_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
554 	rt2x00link_start_tuner(rt2x00dev);
555 }
556 EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_complete);
557 
558 int rt2x00mac_get_stats(struct ieee80211_hw *hw,
559 			struct ieee80211_low_level_stats *stats)
560 {
561 	struct rt2x00_dev *rt2x00dev = hw->priv;
562 
563 	/*
564 	 * The dot11ACKFailureCount, dot11RTSFailureCount and
565 	 * dot11RTSSuccessCount are updated in interrupt time.
566 	 * dot11FCSErrorCount is updated in the link tuner.
567 	 */
568 	memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
569 
570 	return 0;
571 }
572 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
573 
574 void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
575 				struct ieee80211_vif *vif,
576 				struct ieee80211_bss_conf *bss_conf,
577 				u32 changes)
578 {
579 	struct rt2x00_dev *rt2x00dev = hw->priv;
580 	struct rt2x00_intf *intf = vif_to_intf(vif);
581 
582 	/*
583 	 * mac80211 might be calling this function while we are trying
584 	 * to remove the device or perhaps suspending it.
585 	 */
586 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
587 		return;
588 
589 	/*
590 	 * Update the BSSID.
591 	 */
592 	if (changes & BSS_CHANGED_BSSID)
593 		rt2x00lib_config_intf(rt2x00dev, intf, vif->type, NULL,
594 				      bss_conf->bssid);
595 
596 	/*
597 	 * Start/stop beaconing.
598 	 */
599 	if (changes & BSS_CHANGED_BEACON_ENABLED) {
600 		mutex_lock(&intf->beacon_skb_mutex);
601 		if (!bss_conf->enable_beacon && intf->enable_beacon) {
602 			rt2x00dev->intf_beaconing--;
603 			intf->enable_beacon = false;
604 
605 			if (rt2x00dev->intf_beaconing == 0) {
606 				/*
607 				 * Last beaconing interface disabled
608 				 * -> stop beacon queue.
609 				 */
610 				rt2x00queue_stop_queue(rt2x00dev->bcn);
611 			}
612 			/*
613 			 * Clear beacon in the H/W for this vif. This is needed
614 			 * to disable beaconing on this particular interface
615 			 * and keep it running on other interfaces.
616 			 */
617 			rt2x00queue_clear_beacon(rt2x00dev, vif);
618 		} else if (bss_conf->enable_beacon && !intf->enable_beacon) {
619 			rt2x00dev->intf_beaconing++;
620 			intf->enable_beacon = true;
621 			/*
622 			 * Upload beacon to the H/W. This is only required on
623 			 * USB devices. PCI devices fetch beacons periodically.
624 			 */
625 			if (rt2x00_is_usb(rt2x00dev))
626 				rt2x00queue_update_beacon(rt2x00dev, vif);
627 
628 			if (rt2x00dev->intf_beaconing == 1) {
629 				/*
630 				 * First beaconing interface enabled
631 				 * -> start beacon queue.
632 				 */
633 				rt2x00queue_start_queue(rt2x00dev->bcn);
634 			}
635 		}
636 		mutex_unlock(&intf->beacon_skb_mutex);
637 	}
638 
639 	/*
640 	 * When the association status has changed we must reset the link
641 	 * tuner counter. This is because some drivers determine if they
642 	 * should perform link tuning based on the number of seconds
643 	 * while associated or not associated.
644 	 */
645 	if (changes & BSS_CHANGED_ASSOC) {
646 		rt2x00dev->link.count = 0;
647 
648 		if (bss_conf->assoc)
649 			rt2x00dev->intf_associated++;
650 		else
651 			rt2x00dev->intf_associated--;
652 
653 		rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
654 	}
655 
656 	/*
657 	 * When the erp information has changed, we should perform
658 	 * additional configuration steps. For all other changes we are done.
659 	 */
660 	if (changes & (BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE |
661 		       BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BASIC_RATES |
662 		       BSS_CHANGED_BEACON_INT | BSS_CHANGED_HT))
663 		rt2x00lib_config_erp(rt2x00dev, intf, bss_conf, changes);
664 }
665 EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
666 
667 int rt2x00mac_conf_tx(struct ieee80211_hw *hw,
668 		      struct ieee80211_vif *vif, u16 queue_idx,
669 		      const struct ieee80211_tx_queue_params *params)
670 {
671 	struct rt2x00_dev *rt2x00dev = hw->priv;
672 	struct data_queue *queue;
673 
674 	queue = rt2x00queue_get_tx_queue(rt2x00dev, queue_idx);
675 	if (unlikely(!queue))
676 		return -EINVAL;
677 
678 	/*
679 	 * The passed variables are stored as real value ((2^n)-1).
680 	 * Ralink registers require to know the bit number 'n'.
681 	 */
682 	if (params->cw_min > 0)
683 		queue->cw_min = fls(params->cw_min);
684 	else
685 		queue->cw_min = 5; /* cw_min: 2^5 = 32. */
686 
687 	if (params->cw_max > 0)
688 		queue->cw_max = fls(params->cw_max);
689 	else
690 		queue->cw_max = 10; /* cw_min: 2^10 = 1024. */
691 
692 	queue->aifs = params->aifs;
693 	queue->txop = params->txop;
694 
695 	rt2x00_dbg(rt2x00dev,
696 		   "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d, TXop: %d\n",
697 		   queue_idx, queue->cw_min, queue->cw_max, queue->aifs,
698 		   queue->txop);
699 
700 	return 0;
701 }
702 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);
703 
704 void rt2x00mac_rfkill_poll(struct ieee80211_hw *hw)
705 {
706 	struct rt2x00_dev *rt2x00dev = hw->priv;
707 	bool active = !!rt2x00dev->ops->lib->rfkill_poll(rt2x00dev);
708 
709 	wiphy_rfkill_set_hw_state(hw->wiphy, !active);
710 }
711 EXPORT_SYMBOL_GPL(rt2x00mac_rfkill_poll);
712 
713 void rt2x00mac_flush(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
714 		     u32 queues, bool drop)
715 {
716 	struct rt2x00_dev *rt2x00dev = hw->priv;
717 	struct data_queue *queue;
718 
719 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
720 		return;
721 
722 	set_bit(DEVICE_STATE_FLUSHING, &rt2x00dev->flags);
723 
724 	tx_queue_for_each(rt2x00dev, queue)
725 		rt2x00queue_flush_queue(queue, drop);
726 
727 	clear_bit(DEVICE_STATE_FLUSHING, &rt2x00dev->flags);
728 }
729 EXPORT_SYMBOL_GPL(rt2x00mac_flush);
730 
731 int rt2x00mac_set_antenna(struct ieee80211_hw *hw, u32 tx_ant, u32 rx_ant)
732 {
733 	struct rt2x00_dev *rt2x00dev = hw->priv;
734 	struct link_ant *ant = &rt2x00dev->link.ant;
735 	struct antenna_setup *def = &rt2x00dev->default_ant;
736 	struct antenna_setup setup;
737 
738 	// The antenna value is not supposed to be 0,
739 	// or exceed the maximum number of antenna's.
740 	if (!tx_ant || (tx_ant & ~3) || !rx_ant || (rx_ant & ~3))
741 		return -EINVAL;
742 
743 	// When the client tried to configure the antenna to or from
744 	// diversity mode, we must reset the default antenna as well
745 	// as that controls the diversity switch.
746 	if (ant->flags & ANTENNA_TX_DIVERSITY && tx_ant != 3)
747 		ant->flags &= ~ANTENNA_TX_DIVERSITY;
748 	if (ant->flags & ANTENNA_RX_DIVERSITY && rx_ant != 3)
749 		ant->flags &= ~ANTENNA_RX_DIVERSITY;
750 
751 	// If diversity is being enabled, check if we need hardware
752 	// or software diversity. In the latter case, reset the value,
753 	// and make sure we update the antenna flags to have the
754 	// link tuner pick up the diversity tuning.
755 	if (tx_ant == 3 && def->tx == ANTENNA_SW_DIVERSITY) {
756 		tx_ant = ANTENNA_SW_DIVERSITY;
757 		ant->flags |= ANTENNA_TX_DIVERSITY;
758 	}
759 
760 	if (rx_ant == 3 && def->rx == ANTENNA_SW_DIVERSITY) {
761 		rx_ant = ANTENNA_SW_DIVERSITY;
762 		ant->flags |= ANTENNA_RX_DIVERSITY;
763 	}
764 
765 	setup.tx = tx_ant;
766 	setup.rx = rx_ant;
767 	setup.rx_chain_num = 0;
768 	setup.tx_chain_num = 0;
769 
770 	rt2x00lib_config_antenna(rt2x00dev, setup);
771 
772 	return 0;
773 }
774 EXPORT_SYMBOL_GPL(rt2x00mac_set_antenna);
775 
776 int rt2x00mac_get_antenna(struct ieee80211_hw *hw, u32 *tx_ant, u32 *rx_ant)
777 {
778 	struct rt2x00_dev *rt2x00dev = hw->priv;
779 	struct link_ant *ant = &rt2x00dev->link.ant;
780 	struct antenna_setup *active = &rt2x00dev->link.ant.active;
781 
782 	// When software diversity is active, we must report this to the
783 	// client and not the current active antenna state.
784 	if (ant->flags & ANTENNA_TX_DIVERSITY)
785 		*tx_ant = ANTENNA_HW_DIVERSITY;
786 	else
787 		*tx_ant = active->tx;
788 
789 	if (ant->flags & ANTENNA_RX_DIVERSITY)
790 		*rx_ant = ANTENNA_HW_DIVERSITY;
791 	else
792 		*rx_ant = active->rx;
793 
794 	return 0;
795 }
796 EXPORT_SYMBOL_GPL(rt2x00mac_get_antenna);
797 
798 void rt2x00mac_get_ringparam(struct ieee80211_hw *hw,
799 			     u32 *tx, u32 *tx_max, u32 *rx, u32 *rx_max)
800 {
801 	struct rt2x00_dev *rt2x00dev = hw->priv;
802 	struct data_queue *queue;
803 
804 	tx_queue_for_each(rt2x00dev, queue) {
805 		*tx += queue->length;
806 		*tx_max += queue->limit;
807 	}
808 
809 	*rx = rt2x00dev->rx->length;
810 	*rx_max = rt2x00dev->rx->limit;
811 }
812 EXPORT_SYMBOL_GPL(rt2x00mac_get_ringparam);
813 
814 bool rt2x00mac_tx_frames_pending(struct ieee80211_hw *hw)
815 {
816 	struct rt2x00_dev *rt2x00dev = hw->priv;
817 	struct data_queue *queue;
818 
819 	tx_queue_for_each(rt2x00dev, queue) {
820 		if (!rt2x00queue_empty(queue))
821 			return true;
822 	}
823 
824 	return false;
825 }
826 EXPORT_SYMBOL_GPL(rt2x00mac_tx_frames_pending);
827