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)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
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,u32 changed)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
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 vif->type != NL80211_IFTYPE_WDS)
413 return;
414
415 set_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags);
416 }
417
rt2x00mac_set_tim(struct ieee80211_hw * hw,struct ieee80211_sta * sta,bool set)418 int rt2x00mac_set_tim(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
419 bool set)
420 {
421 struct rt2x00_dev *rt2x00dev = hw->priv;
422
423 if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
424 return 0;
425
426 ieee80211_iterate_active_interfaces_atomic(
427 rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
428 rt2x00mac_set_tim_iter, rt2x00dev);
429
430 /* queue work to upodate the beacon template */
431 ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->intf_work);
432 return 0;
433 }
434 EXPORT_SYMBOL_GPL(rt2x00mac_set_tim);
435
436 #ifdef CONFIG_RT2X00_LIB_CRYPTO
memcpy_tkip(struct rt2x00lib_crypto * crypto,u8 * key,u8 key_len)437 static void memcpy_tkip(struct rt2x00lib_crypto *crypto, u8 *key, u8 key_len)
438 {
439 if (key_len > NL80211_TKIP_DATA_OFFSET_ENCR_KEY)
440 memcpy(crypto->key,
441 &key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY],
442 sizeof(crypto->key));
443
444 if (key_len > NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY)
445 memcpy(crypto->tx_mic,
446 &key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY],
447 sizeof(crypto->tx_mic));
448
449 if (key_len > NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY)
450 memcpy(crypto->rx_mic,
451 &key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY],
452 sizeof(crypto->rx_mic));
453 }
454
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)455 int rt2x00mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
456 struct ieee80211_vif *vif, struct ieee80211_sta *sta,
457 struct ieee80211_key_conf *key)
458 {
459 struct rt2x00_dev *rt2x00dev = hw->priv;
460 int (*set_key) (struct rt2x00_dev *rt2x00dev,
461 struct rt2x00lib_crypto *crypto,
462 struct ieee80211_key_conf *key);
463 struct rt2x00lib_crypto crypto;
464 static const u8 bcast_addr[ETH_ALEN] =
465 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, };
466 struct rt2x00_sta *sta_priv = NULL;
467
468 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
469 return 0;
470
471 /* The hardware can't do MFP */
472 if (!rt2x00_has_cap_hw_crypto(rt2x00dev) || (sta && sta->mfp))
473 return -EOPNOTSUPP;
474
475 /*
476 * To support IBSS RSN, don't program group keys in IBSS, the
477 * hardware will then not attempt to decrypt the frames.
478 */
479 if (vif->type == NL80211_IFTYPE_ADHOC &&
480 !(key->flags & IEEE80211_KEY_FLAG_PAIRWISE))
481 return -EOPNOTSUPP;
482
483 if (key->keylen > 32)
484 return -ENOSPC;
485
486 memset(&crypto, 0, sizeof(crypto));
487
488 crypto.bssidx = rt2x00lib_get_bssidx(rt2x00dev, vif);
489 crypto.cipher = rt2x00crypto_key_to_cipher(key);
490 if (crypto.cipher == CIPHER_NONE)
491 return -EOPNOTSUPP;
492 if (crypto.cipher == CIPHER_TKIP && rt2x00_is_usb(rt2x00dev))
493 return -EOPNOTSUPP;
494
495 crypto.cmd = cmd;
496
497 if (sta) {
498 crypto.address = sta->addr;
499 sta_priv = sta_to_rt2x00_sta(sta);
500 crypto.wcid = sta_priv->wcid;
501 } else
502 crypto.address = bcast_addr;
503
504 if (crypto.cipher == CIPHER_TKIP)
505 memcpy_tkip(&crypto, &key->key[0], key->keylen);
506 else
507 memcpy(crypto.key, &key->key[0], key->keylen);
508 /*
509 * Each BSS has a maximum of 4 shared keys.
510 * Shared key index values:
511 * 0) BSS0 key0
512 * 1) BSS0 key1
513 * ...
514 * 4) BSS1 key0
515 * ...
516 * 8) BSS2 key0
517 * ...
518 * Both pairwise as shared key indeces are determined by
519 * driver. This is required because the hardware requires
520 * keys to be assigned in correct order (When key 1 is
521 * provided but key 0 is not, then the key is not found
522 * by the hardware during RX).
523 */
524 if (cmd == SET_KEY)
525 key->hw_key_idx = 0;
526
527 if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
528 set_key = rt2x00dev->ops->lib->config_pairwise_key;
529 else
530 set_key = rt2x00dev->ops->lib->config_shared_key;
531
532 if (!set_key)
533 return -EOPNOTSUPP;
534
535 return set_key(rt2x00dev, &crypto, key);
536 }
537 EXPORT_SYMBOL_GPL(rt2x00mac_set_key);
538 #endif /* CONFIG_RT2X00_LIB_CRYPTO */
539
rt2x00mac_sw_scan_start(struct ieee80211_hw * hw,struct ieee80211_vif * vif,const u8 * mac_addr)540 void rt2x00mac_sw_scan_start(struct ieee80211_hw *hw,
541 struct ieee80211_vif *vif,
542 const u8 *mac_addr)
543 {
544 struct rt2x00_dev *rt2x00dev = hw->priv;
545 set_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
546 rt2x00link_stop_tuner(rt2x00dev);
547 }
548 EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_start);
549
rt2x00mac_sw_scan_complete(struct ieee80211_hw * hw,struct ieee80211_vif * vif)550 void rt2x00mac_sw_scan_complete(struct ieee80211_hw *hw,
551 struct ieee80211_vif *vif)
552 {
553 struct rt2x00_dev *rt2x00dev = hw->priv;
554 clear_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
555 rt2x00link_start_tuner(rt2x00dev);
556 }
557 EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_complete);
558
rt2x00mac_get_stats(struct ieee80211_hw * hw,struct ieee80211_low_level_stats * stats)559 int rt2x00mac_get_stats(struct ieee80211_hw *hw,
560 struct ieee80211_low_level_stats *stats)
561 {
562 struct rt2x00_dev *rt2x00dev = hw->priv;
563
564 /*
565 * The dot11ACKFailureCount, dot11RTSFailureCount and
566 * dot11RTSSuccessCount are updated in interrupt time.
567 * dot11FCSErrorCount is updated in the link tuner.
568 */
569 memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
570
571 return 0;
572 }
573 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
574
rt2x00mac_bss_info_changed(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_bss_conf * bss_conf,u32 changes)575 void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
576 struct ieee80211_vif *vif,
577 struct ieee80211_bss_conf *bss_conf,
578 u32 changes)
579 {
580 struct rt2x00_dev *rt2x00dev = hw->priv;
581 struct rt2x00_intf *intf = vif_to_intf(vif);
582
583 /*
584 * mac80211 might be calling this function while we are trying
585 * to remove the device or perhaps suspending it.
586 */
587 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
588 return;
589
590 /*
591 * Update the BSSID.
592 */
593 if (changes & BSS_CHANGED_BSSID)
594 rt2x00lib_config_intf(rt2x00dev, intf, vif->type, NULL,
595 bss_conf->bssid);
596
597 /*
598 * Start/stop beaconing.
599 */
600 if (changes & BSS_CHANGED_BEACON_ENABLED) {
601 mutex_lock(&intf->beacon_skb_mutex);
602 if (!bss_conf->enable_beacon && intf->enable_beacon) {
603 rt2x00dev->intf_beaconing--;
604 intf->enable_beacon = false;
605
606 if (rt2x00dev->intf_beaconing == 0) {
607 /*
608 * Last beaconing interface disabled
609 * -> stop beacon queue.
610 */
611 rt2x00queue_stop_queue(rt2x00dev->bcn);
612 }
613 /*
614 * Clear beacon in the H/W for this vif. This is needed
615 * to disable beaconing on this particular interface
616 * and keep it running on other interfaces.
617 */
618 rt2x00queue_clear_beacon(rt2x00dev, vif);
619 } else if (bss_conf->enable_beacon && !intf->enable_beacon) {
620 rt2x00dev->intf_beaconing++;
621 intf->enable_beacon = true;
622 /*
623 * Upload beacon to the H/W. This is only required on
624 * USB devices. PCI devices fetch beacons periodically.
625 */
626 if (rt2x00_is_usb(rt2x00dev))
627 rt2x00queue_update_beacon(rt2x00dev, vif);
628
629 if (rt2x00dev->intf_beaconing == 1) {
630 /*
631 * First beaconing interface enabled
632 * -> start beacon queue.
633 */
634 rt2x00queue_start_queue(rt2x00dev->bcn);
635 }
636 }
637 mutex_unlock(&intf->beacon_skb_mutex);
638 }
639
640 /*
641 * When the association status has changed we must reset the link
642 * tuner counter. This is because some drivers determine if they
643 * should perform link tuning based on the number of seconds
644 * while associated or not associated.
645 */
646 if (changes & BSS_CHANGED_ASSOC) {
647 rt2x00dev->link.count = 0;
648
649 if (bss_conf->assoc)
650 rt2x00dev->intf_associated++;
651 else
652 rt2x00dev->intf_associated--;
653
654 rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
655 }
656
657 /*
658 * When the erp information has changed, we should perform
659 * additional configuration steps. For all other changes we are done.
660 */
661 if (changes & (BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE |
662 BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BASIC_RATES |
663 BSS_CHANGED_BEACON_INT | BSS_CHANGED_HT))
664 rt2x00lib_config_erp(rt2x00dev, intf, bss_conf, changes);
665 }
666 EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
667
rt2x00mac_conf_tx(struct ieee80211_hw * hw,struct ieee80211_vif * vif,u16 queue_idx,const struct ieee80211_tx_queue_params * params)668 int rt2x00mac_conf_tx(struct ieee80211_hw *hw,
669 struct ieee80211_vif *vif, u16 queue_idx,
670 const struct ieee80211_tx_queue_params *params)
671 {
672 struct rt2x00_dev *rt2x00dev = hw->priv;
673 struct data_queue *queue;
674
675 queue = rt2x00queue_get_tx_queue(rt2x00dev, queue_idx);
676 if (unlikely(!queue))
677 return -EINVAL;
678
679 /*
680 * The passed variables are stored as real value ((2^n)-1).
681 * Ralink registers require to know the bit number 'n'.
682 */
683 if (params->cw_min > 0)
684 queue->cw_min = fls(params->cw_min);
685 else
686 queue->cw_min = 5; /* cw_min: 2^5 = 32. */
687
688 if (params->cw_max > 0)
689 queue->cw_max = fls(params->cw_max);
690 else
691 queue->cw_max = 10; /* cw_min: 2^10 = 1024. */
692
693 queue->aifs = params->aifs;
694 queue->txop = params->txop;
695
696 rt2x00_dbg(rt2x00dev,
697 "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d, TXop: %d\n",
698 queue_idx, queue->cw_min, queue->cw_max, queue->aifs,
699 queue->txop);
700
701 return 0;
702 }
703 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);
704
rt2x00mac_rfkill_poll(struct ieee80211_hw * hw)705 void rt2x00mac_rfkill_poll(struct ieee80211_hw *hw)
706 {
707 struct rt2x00_dev *rt2x00dev = hw->priv;
708 bool active = !!rt2x00dev->ops->lib->rfkill_poll(rt2x00dev);
709
710 wiphy_rfkill_set_hw_state(hw->wiphy, !active);
711 }
712 EXPORT_SYMBOL_GPL(rt2x00mac_rfkill_poll);
713
rt2x00mac_flush(struct ieee80211_hw * hw,struct ieee80211_vif * vif,u32 queues,bool drop)714 void rt2x00mac_flush(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
715 u32 queues, bool drop)
716 {
717 struct rt2x00_dev *rt2x00dev = hw->priv;
718 struct data_queue *queue;
719
720 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
721 return;
722
723 set_bit(DEVICE_STATE_FLUSHING, &rt2x00dev->flags);
724
725 tx_queue_for_each(rt2x00dev, queue)
726 rt2x00queue_flush_queue(queue, drop);
727
728 clear_bit(DEVICE_STATE_FLUSHING, &rt2x00dev->flags);
729 }
730 EXPORT_SYMBOL_GPL(rt2x00mac_flush);
731
rt2x00mac_set_antenna(struct ieee80211_hw * hw,u32 tx_ant,u32 rx_ant)732 int rt2x00mac_set_antenna(struct ieee80211_hw *hw, u32 tx_ant, u32 rx_ant)
733 {
734 struct rt2x00_dev *rt2x00dev = hw->priv;
735 struct link_ant *ant = &rt2x00dev->link.ant;
736 struct antenna_setup *def = &rt2x00dev->default_ant;
737 struct antenna_setup setup;
738
739 // The antenna value is not supposed to be 0,
740 // or exceed the maximum number of antenna's.
741 if (!tx_ant || (tx_ant & ~3) || !rx_ant || (rx_ant & ~3))
742 return -EINVAL;
743
744 // When the client tried to configure the antenna to or from
745 // diversity mode, we must reset the default antenna as well
746 // as that controls the diversity switch.
747 if (ant->flags & ANTENNA_TX_DIVERSITY && tx_ant != 3)
748 ant->flags &= ~ANTENNA_TX_DIVERSITY;
749 if (ant->flags & ANTENNA_RX_DIVERSITY && rx_ant != 3)
750 ant->flags &= ~ANTENNA_RX_DIVERSITY;
751
752 // If diversity is being enabled, check if we need hardware
753 // or software diversity. In the latter case, reset the value,
754 // and make sure we update the antenna flags to have the
755 // link tuner pick up the diversity tuning.
756 if (tx_ant == 3 && def->tx == ANTENNA_SW_DIVERSITY) {
757 tx_ant = ANTENNA_SW_DIVERSITY;
758 ant->flags |= ANTENNA_TX_DIVERSITY;
759 }
760
761 if (rx_ant == 3 && def->rx == ANTENNA_SW_DIVERSITY) {
762 rx_ant = ANTENNA_SW_DIVERSITY;
763 ant->flags |= ANTENNA_RX_DIVERSITY;
764 }
765
766 setup.tx = tx_ant;
767 setup.rx = rx_ant;
768 setup.rx_chain_num = 0;
769 setup.tx_chain_num = 0;
770
771 rt2x00lib_config_antenna(rt2x00dev, setup);
772
773 return 0;
774 }
775 EXPORT_SYMBOL_GPL(rt2x00mac_set_antenna);
776
rt2x00mac_get_antenna(struct ieee80211_hw * hw,u32 * tx_ant,u32 * rx_ant)777 int rt2x00mac_get_antenna(struct ieee80211_hw *hw, u32 *tx_ant, u32 *rx_ant)
778 {
779 struct rt2x00_dev *rt2x00dev = hw->priv;
780 struct link_ant *ant = &rt2x00dev->link.ant;
781 struct antenna_setup *active = &rt2x00dev->link.ant.active;
782
783 // When software diversity is active, we must report this to the
784 // client and not the current active antenna state.
785 if (ant->flags & ANTENNA_TX_DIVERSITY)
786 *tx_ant = ANTENNA_HW_DIVERSITY;
787 else
788 *tx_ant = active->tx;
789
790 if (ant->flags & ANTENNA_RX_DIVERSITY)
791 *rx_ant = ANTENNA_HW_DIVERSITY;
792 else
793 *rx_ant = active->rx;
794
795 return 0;
796 }
797 EXPORT_SYMBOL_GPL(rt2x00mac_get_antenna);
798
rt2x00mac_get_ringparam(struct ieee80211_hw * hw,u32 * tx,u32 * tx_max,u32 * rx,u32 * rx_max)799 void rt2x00mac_get_ringparam(struct ieee80211_hw *hw,
800 u32 *tx, u32 *tx_max, u32 *rx, u32 *rx_max)
801 {
802 struct rt2x00_dev *rt2x00dev = hw->priv;
803 struct data_queue *queue;
804
805 tx_queue_for_each(rt2x00dev, queue) {
806 *tx += queue->length;
807 *tx_max += queue->limit;
808 }
809
810 *rx = rt2x00dev->rx->length;
811 *rx_max = rt2x00dev->rx->limit;
812 }
813 EXPORT_SYMBOL_GPL(rt2x00mac_get_ringparam);
814
rt2x00mac_tx_frames_pending(struct ieee80211_hw * hw)815 bool rt2x00mac_tx_frames_pending(struct ieee80211_hw *hw)
816 {
817 struct rt2x00_dev *rt2x00dev = hw->priv;
818 struct data_queue *queue;
819
820 tx_queue_for_each(rt2x00dev, queue) {
821 if (!rt2x00queue_empty(queue))
822 return true;
823 }
824
825 return false;
826 }
827 EXPORT_SYMBOL_GPL(rt2x00mac_tx_frames_pending);
828
