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 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
rt2x00mac_stop(struct ieee80211_hw * hw,bool suspend)181 void rt2x00mac_stop(struct ieee80211_hw *hw, bool suspend)
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
rt2x00mac_reconfig_complete(struct ieee80211_hw * hw,enum ieee80211_reconfig_type reconfig_type)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
rt2x00mac_add_interface(struct ieee80211_hw * hw,struct ieee80211_vif * vif)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
rt2x00mac_remove_interface(struct ieee80211_hw * hw,struct ieee80211_vif * vif)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
rt2x00mac_config(struct ieee80211_hw * hw,int radio_idx,u32 changed)307 int rt2x00mac_config(struct ieee80211_hw *hw, int radio_idx, 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 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
rt2x00mac_configure_filter(struct ieee80211_hw * hw,unsigned int changed_flags,unsigned int * total_flags,u64 multicast)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
rt2x00mac_set_tim_iter(void * data,u8 * mac,struct ieee80211_vif * vif)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
rt2x00mac_set_tim(struct ieee80211_hw * hw,struct ieee80211_sta * sta,bool set)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
memcpy_tkip(struct rt2x00lib_crypto * crypto,u8 * key,u8 key_len)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
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)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
rt2x00mac_sw_scan_start(struct ieee80211_hw * hw,struct ieee80211_vif * vif,const u8 * mac_addr)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
rt2x00mac_sw_scan_complete(struct ieee80211_hw * hw,struct ieee80211_vif * vif)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
rt2x00mac_get_stats(struct ieee80211_hw * hw,struct ieee80211_low_level_stats * stats)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
rt2x00mac_bss_info_changed(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_bss_conf * bss_conf,u64 changes)574 void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
575 struct ieee80211_vif *vif,
576 struct ieee80211_bss_conf *bss_conf,
577 u64 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
602 /*
603 * Clear the 'enable_beacon' flag and clear beacon because
604 * the beacon queue has been stopped after hardware reset.
605 */
606 if (test_bit(DEVICE_STATE_RESET, &rt2x00dev->flags) &&
607 intf->enable_beacon) {
608 intf->enable_beacon = false;
609 rt2x00queue_clear_beacon(rt2x00dev, vif);
610 }
611
612 if (!bss_conf->enable_beacon && intf->enable_beacon) {
613 rt2x00dev->intf_beaconing--;
614 intf->enable_beacon = false;
615
616 if (rt2x00dev->intf_beaconing == 0) {
617 /*
618 * Last beaconing interface disabled
619 * -> stop beacon queue.
620 */
621 rt2x00queue_stop_queue(rt2x00dev->bcn);
622 }
623 /*
624 * Clear beacon in the H/W for this vif. This is needed
625 * to disable beaconing on this particular interface
626 * and keep it running on other interfaces.
627 */
628 rt2x00queue_clear_beacon(rt2x00dev, vif);
629 } else if (bss_conf->enable_beacon && !intf->enable_beacon) {
630 rt2x00dev->intf_beaconing++;
631 intf->enable_beacon = true;
632 /*
633 * Upload beacon to the H/W. This is only required on
634 * USB devices. PCI devices fetch beacons periodically.
635 */
636 if (rt2x00_is_usb(rt2x00dev))
637 rt2x00queue_update_beacon(rt2x00dev, vif);
638
639 if (rt2x00dev->intf_beaconing == 1) {
640 /*
641 * First beaconing interface enabled
642 * -> start beacon queue.
643 */
644 rt2x00queue_start_queue(rt2x00dev->bcn);
645 }
646 }
647 mutex_unlock(&intf->beacon_skb_mutex);
648 }
649
650 /*
651 * When the association status has changed we must reset the link
652 * tuner counter. This is because some drivers determine if they
653 * should perform link tuning based on the number of seconds
654 * while associated or not associated.
655 */
656 if (changes & BSS_CHANGED_ASSOC) {
657 rt2x00dev->link.count = 0;
658
659 if (vif->cfg.assoc)
660 rt2x00dev->intf_associated++;
661 else
662 rt2x00dev->intf_associated--;
663
664 rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
665 }
666
667 /*
668 * When the erp information has changed, we should perform
669 * additional configuration steps. For all other changes we are done.
670 */
671 if (changes & (BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE |
672 BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BASIC_RATES |
673 BSS_CHANGED_BEACON_INT | BSS_CHANGED_HT))
674 rt2x00lib_config_erp(rt2x00dev, intf, bss_conf, changes);
675 }
676 EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
677
rt2x00mac_conf_tx(struct ieee80211_hw * hw,struct ieee80211_vif * vif,unsigned int link_id,u16 queue_idx,const struct ieee80211_tx_queue_params * params)678 int rt2x00mac_conf_tx(struct ieee80211_hw *hw,
679 struct ieee80211_vif *vif,
680 unsigned int link_id, u16 queue_idx,
681 const struct ieee80211_tx_queue_params *params)
682 {
683 struct rt2x00_dev *rt2x00dev = hw->priv;
684 struct data_queue *queue;
685
686 queue = rt2x00queue_get_tx_queue(rt2x00dev, queue_idx);
687 if (unlikely(!queue))
688 return -EINVAL;
689
690 /*
691 * The passed variables are stored as real value ((2^n)-1).
692 * Ralink registers require to know the bit number 'n'.
693 */
694 if (params->cw_min > 0)
695 queue->cw_min = fls(params->cw_min);
696 else
697 queue->cw_min = 5; /* cw_min: 2^5 = 32. */
698
699 if (params->cw_max > 0)
700 queue->cw_max = fls(params->cw_max);
701 else
702 queue->cw_max = 10; /* cw_min: 2^10 = 1024. */
703
704 queue->aifs = params->aifs;
705 queue->txop = params->txop;
706
707 rt2x00_dbg(rt2x00dev,
708 "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d, TXop: %d\n",
709 queue_idx, queue->cw_min, queue->cw_max, queue->aifs,
710 queue->txop);
711
712 return 0;
713 }
714 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);
715
rt2x00mac_rfkill_poll(struct ieee80211_hw * hw)716 void rt2x00mac_rfkill_poll(struct ieee80211_hw *hw)
717 {
718 struct rt2x00_dev *rt2x00dev = hw->priv;
719 bool active = !!rt2x00dev->ops->lib->rfkill_poll(rt2x00dev);
720
721 wiphy_rfkill_set_hw_state(hw->wiphy, !active);
722 }
723 EXPORT_SYMBOL_GPL(rt2x00mac_rfkill_poll);
724
rt2x00mac_flush(struct ieee80211_hw * hw,struct ieee80211_vif * vif,u32 queues,bool drop)725 void rt2x00mac_flush(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
726 u32 queues, bool drop)
727 {
728 struct rt2x00_dev *rt2x00dev = hw->priv;
729 struct data_queue *queue;
730
731 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
732 return;
733
734 set_bit(DEVICE_STATE_FLUSHING, &rt2x00dev->flags);
735
736 tx_queue_for_each(rt2x00dev, queue)
737 rt2x00queue_flush_queue(queue, drop);
738
739 clear_bit(DEVICE_STATE_FLUSHING, &rt2x00dev->flags);
740 }
741 EXPORT_SYMBOL_GPL(rt2x00mac_flush);
742
rt2x00mac_set_antenna(struct ieee80211_hw * hw,int radio_idx,u32 tx_ant,u32 rx_ant)743 int rt2x00mac_set_antenna(struct ieee80211_hw *hw, int radio_idx,
744 u32 tx_ant, u32 rx_ant)
745 {
746 struct rt2x00_dev *rt2x00dev = hw->priv;
747 struct link_ant *ant = &rt2x00dev->link.ant;
748 struct antenna_setup *def = &rt2x00dev->default_ant;
749 struct antenna_setup setup;
750
751 // The antenna value is not supposed to be 0,
752 // or exceed the maximum number of antenna's.
753 if (!tx_ant || (tx_ant & ~3) || !rx_ant || (rx_ant & ~3))
754 return -EINVAL;
755
756 // When the client tried to configure the antenna to or from
757 // diversity mode, we must reset the default antenna as well
758 // as that controls the diversity switch.
759 if (ant->flags & ANTENNA_TX_DIVERSITY && tx_ant != 3)
760 ant->flags &= ~ANTENNA_TX_DIVERSITY;
761 if (ant->flags & ANTENNA_RX_DIVERSITY && rx_ant != 3)
762 ant->flags &= ~ANTENNA_RX_DIVERSITY;
763
764 // If diversity is being enabled, check if we need hardware
765 // or software diversity. In the latter case, reset the value,
766 // and make sure we update the antenna flags to have the
767 // link tuner pick up the diversity tuning.
768 if (tx_ant == 3 && def->tx == ANTENNA_SW_DIVERSITY) {
769 tx_ant = ANTENNA_SW_DIVERSITY;
770 ant->flags |= ANTENNA_TX_DIVERSITY;
771 }
772
773 if (rx_ant == 3 && def->rx == ANTENNA_SW_DIVERSITY) {
774 rx_ant = ANTENNA_SW_DIVERSITY;
775 ant->flags |= ANTENNA_RX_DIVERSITY;
776 }
777
778 setup.tx = tx_ant;
779 setup.rx = rx_ant;
780 setup.rx_chain_num = 0;
781 setup.tx_chain_num = 0;
782
783 rt2x00lib_config_antenna(rt2x00dev, setup);
784
785 return 0;
786 }
787 EXPORT_SYMBOL_GPL(rt2x00mac_set_antenna);
788
rt2x00mac_get_antenna(struct ieee80211_hw * hw,int radio_idx,u32 * tx_ant,u32 * rx_ant)789 int rt2x00mac_get_antenna(struct ieee80211_hw *hw, int radio_idx,
790 u32 *tx_ant, u32 *rx_ant)
791 {
792 struct rt2x00_dev *rt2x00dev = hw->priv;
793 struct link_ant *ant = &rt2x00dev->link.ant;
794 struct antenna_setup *active = &rt2x00dev->link.ant.active;
795
796 // When software diversity is active, we must report this to the
797 // client and not the current active antenna state.
798 if (ant->flags & ANTENNA_TX_DIVERSITY)
799 *tx_ant = ANTENNA_HW_DIVERSITY;
800 else
801 *tx_ant = active->tx;
802
803 if (ant->flags & ANTENNA_RX_DIVERSITY)
804 *rx_ant = ANTENNA_HW_DIVERSITY;
805 else
806 *rx_ant = active->rx;
807
808 return 0;
809 }
810 EXPORT_SYMBOL_GPL(rt2x00mac_get_antenna);
811
rt2x00mac_get_ringparam(struct ieee80211_hw * hw,u32 * tx,u32 * tx_max,u32 * rx,u32 * rx_max)812 void rt2x00mac_get_ringparam(struct ieee80211_hw *hw,
813 u32 *tx, u32 *tx_max, u32 *rx, u32 *rx_max)
814 {
815 struct rt2x00_dev *rt2x00dev = hw->priv;
816 struct data_queue *queue;
817
818 tx_queue_for_each(rt2x00dev, queue) {
819 *tx += queue->length;
820 *tx_max += queue->limit;
821 }
822
823 *rx = rt2x00dev->rx->length;
824 *rx_max = rt2x00dev->rx->limit;
825 }
826 EXPORT_SYMBOL_GPL(rt2x00mac_get_ringparam);
827
rt2x00mac_tx_frames_pending(struct ieee80211_hw * hw)828 bool rt2x00mac_tx_frames_pending(struct ieee80211_hw *hw)
829 {
830 struct rt2x00_dev *rt2x00dev = hw->priv;
831 struct data_queue *queue;
832
833 tx_queue_for_each(rt2x00dev, queue) {
834 if (!rt2x00queue_empty(queue))
835 return true;
836 }
837
838 return false;
839 }
840 EXPORT_SYMBOL_GPL(rt2x00mac_tx_frames_pending);
841