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
rt2x00mac_tx_rts_cts(struct rt2x00_dev * rt2x00dev,struct data_queue * queue,struct sk_buff * frag_skb)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
rt2x00mac_tx(struct ieee80211_hw * hw,struct ieee80211_tx_control * control,struct sk_buff * skb)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
rt2x00mac_start(struct ieee80211_hw * hw)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
rt2x00mac_stop(struct ieee80211_hw * hw)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
rt2x00mac_add_interface(struct ieee80211_hw * hw,struct ieee80211_vif * vif)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
rt2x00mac_remove_interface(struct ieee80211_hw * hw,struct ieee80211_vif * vif)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
rt2x00mac_config(struct ieee80211_hw * hw,u32 changed)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
rt2x00mac_configure_filter(struct ieee80211_hw * hw,unsigned int changed_flags,unsigned int * total_flags,u64 multicast)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
rt2x00mac_set_tim_iter(void * data,u8 * mac,struct ieee80211_vif * vif)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
rt2x00mac_set_tim(struct ieee80211_hw * hw,struct ieee80211_sta * sta,bool set)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
memcpy_tkip(struct rt2x00lib_crypto * crypto,u8 * key,u8 key_len)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
rt2x00mac_set_key(struct ieee80211_hw * hw,enum set_key_cmd cmd,struct ieee80211_vif * vif,struct ieee80211_sta * sta,struct ieee80211_key_conf * key)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
rt2x00mac_sw_scan_start(struct ieee80211_hw * hw,struct ieee80211_vif * vif,const u8 * mac_addr)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
rt2x00mac_sw_scan_complete(struct ieee80211_hw * hw,struct ieee80211_vif * vif)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
rt2x00mac_get_stats(struct ieee80211_hw * hw,struct ieee80211_low_level_stats * stats)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
rt2x00mac_bss_info_changed(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_bss_conf * bss_conf,u32 changes)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
rt2x00mac_conf_tx(struct ieee80211_hw * hw,struct ieee80211_vif * vif,u16 queue_idx,const struct ieee80211_tx_queue_params * params)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
rt2x00mac_rfkill_poll(struct ieee80211_hw * hw)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
rt2x00mac_flush(struct ieee80211_hw * hw,struct ieee80211_vif * vif,u32 queues,bool drop)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
rt2x00mac_set_antenna(struct ieee80211_hw * hw,u32 tx_ant,u32 rx_ant)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
rt2x00mac_get_antenna(struct ieee80211_hw * hw,u32 * tx_ant,u32 * rx_ant)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
rt2x00mac_get_ringparam(struct ieee80211_hw * hw,u32 * tx,u32 * tx_max,u32 * rx,u32 * rx_max)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
rt2x00mac_tx_frames_pending(struct ieee80211_hw * hw)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
