1 /*
2 Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
3 <http://rt2x00.serialmonkey.com>
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, see <http://www.gnu.org/licenses/>.
17 */
18
19 /*
20 Module: rt2x00mac
21 Abstract: rt2x00 generic mac80211 routines.
22 */
23
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26
27 #include "rt2x00.h"
28 #include "rt2x00lib.h"
29
rt2x00mac_tx_rts_cts(struct rt2x00_dev * rt2x00dev,struct data_queue * queue,struct sk_buff * frag_skb)30 static int rt2x00mac_tx_rts_cts(struct rt2x00_dev *rt2x00dev,
31 struct data_queue *queue,
32 struct sk_buff *frag_skb)
33 {
34 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(frag_skb);
35 struct ieee80211_tx_info *rts_info;
36 struct sk_buff *skb;
37 unsigned int data_length;
38 int retval = 0;
39
40 if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
41 data_length = sizeof(struct ieee80211_cts);
42 else
43 data_length = sizeof(struct ieee80211_rts);
44
45 skb = dev_alloc_skb(data_length + rt2x00dev->hw->extra_tx_headroom);
46 if (unlikely(!skb)) {
47 rt2x00_warn(rt2x00dev, "Failed to create RTS/CTS frame\n");
48 return -ENOMEM;
49 }
50
51 skb_reserve(skb, rt2x00dev->hw->extra_tx_headroom);
52 skb_put(skb, data_length);
53
54 /*
55 * Copy TX information over from original frame to
56 * RTS/CTS frame. Note that we set the no encryption flag
57 * since we don't want this frame to be encrypted.
58 * RTS frames should be acked, while CTS-to-self frames
59 * should not. The ready for TX flag is cleared to prevent
60 * it being automatically send when the descriptor is
61 * written to the hardware.
62 */
63 memcpy(skb->cb, frag_skb->cb, sizeof(skb->cb));
64 rts_info = IEEE80211_SKB_CB(skb);
65 rts_info->control.rates[0].flags &= ~IEEE80211_TX_RC_USE_RTS_CTS;
66 rts_info->control.rates[0].flags &= ~IEEE80211_TX_RC_USE_CTS_PROTECT;
67
68 if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
69 rts_info->flags |= IEEE80211_TX_CTL_NO_ACK;
70 else
71 rts_info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
72
73 /* Disable hardware encryption */
74 rts_info->control.hw_key = NULL;
75
76 /*
77 * RTS/CTS frame should use the length of the frame plus any
78 * encryption overhead that will be added by the hardware.
79 */
80 data_length += rt2x00crypto_tx_overhead(rt2x00dev, skb);
81
82 if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
83 ieee80211_ctstoself_get(rt2x00dev->hw, tx_info->control.vif,
84 frag_skb->data, data_length, tx_info,
85 (struct ieee80211_cts *)(skb->data));
86 else
87 ieee80211_rts_get(rt2x00dev->hw, tx_info->control.vif,
88 frag_skb->data, data_length, tx_info,
89 (struct ieee80211_rts *)(skb->data));
90
91 retval = rt2x00queue_write_tx_frame(queue, skb, NULL, true);
92 if (retval) {
93 dev_kfree_skb_any(skb);
94 rt2x00_warn(rt2x00dev, "Failed to send RTS/CTS frame\n");
95 }
96
97 return retval;
98 }
99
rt2x00mac_tx(struct ieee80211_hw * hw,struct ieee80211_tx_control * control,struct sk_buff * skb)100 void rt2x00mac_tx(struct ieee80211_hw *hw,
101 struct ieee80211_tx_control *control,
102 struct sk_buff *skb)
103 {
104 struct rt2x00_dev *rt2x00dev = hw->priv;
105 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
106 enum data_queue_qid qid = skb_get_queue_mapping(skb);
107 struct data_queue *queue = NULL;
108
109 /*
110 * Mac80211 might be calling this function while we are trying
111 * to remove the device or perhaps suspending it.
112 * Note that we can only stop the TX queues inside the TX path
113 * due to possible race conditions in mac80211.
114 */
115 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
116 goto exit_free_skb;
117
118 /*
119 * Use the ATIM queue if appropriate and present.
120 */
121 if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM &&
122 rt2x00_has_cap_flag(rt2x00dev, REQUIRE_ATIM_QUEUE))
123 qid = QID_ATIM;
124
125 queue = rt2x00queue_get_tx_queue(rt2x00dev, qid);
126 if (unlikely(!queue)) {
127 rt2x00_err(rt2x00dev,
128 "Attempt to send packet over invalid queue %d\n"
129 "Please file bug report to %s\n", qid, DRV_PROJECT);
130 goto exit_free_skb;
131 }
132
133 /*
134 * If CTS/RTS is required. create and queue that frame first.
135 * Make sure we have at least enough entries available to send
136 * this CTS/RTS frame as well as the data frame.
137 * Note that when the driver has set the set_rts_threshold()
138 * callback function it doesn't need software generation of
139 * either RTS or CTS-to-self frame and handles everything
140 * inside the hardware.
141 */
142 if (!rt2x00dev->ops->hw->set_rts_threshold &&
143 (tx_info->control.rates[0].flags & (IEEE80211_TX_RC_USE_RTS_CTS |
144 IEEE80211_TX_RC_USE_CTS_PROTECT))) {
145 if (rt2x00queue_available(queue) <= 1) {
146 /*
147 * Recheck for full queue under lock to avoid race
148 * conditions with rt2x00lib_txdone().
149 */
150 spin_lock(&queue->tx_lock);
151 if (rt2x00queue_threshold(queue))
152 rt2x00queue_pause_queue(queue);
153 spin_unlock(&queue->tx_lock);
154
155 goto exit_free_skb;
156 }
157
158 if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb))
159 goto exit_free_skb;
160 }
161
162 if (unlikely(rt2x00queue_write_tx_frame(queue, skb, control->sta, false)))
163 goto exit_free_skb;
164
165 return;
166
167 exit_free_skb:
168 ieee80211_free_txskb(hw, skb);
169 }
170 EXPORT_SYMBOL_GPL(rt2x00mac_tx);
171
rt2x00mac_start(struct ieee80211_hw * hw)172 int rt2x00mac_start(struct ieee80211_hw *hw)
173 {
174 struct rt2x00_dev *rt2x00dev = hw->priv;
175
176 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
177 return 0;
178
179 return rt2x00lib_start(rt2x00dev);
180 }
181 EXPORT_SYMBOL_GPL(rt2x00mac_start);
182
rt2x00mac_stop(struct ieee80211_hw * hw)183 void rt2x00mac_stop(struct ieee80211_hw *hw)
184 {
185 struct rt2x00_dev *rt2x00dev = hw->priv;
186
187 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
188 return;
189
190 rt2x00lib_stop(rt2x00dev);
191 }
192 EXPORT_SYMBOL_GPL(rt2x00mac_stop);
193
rt2x00mac_add_interface(struct ieee80211_hw * hw,struct ieee80211_vif * vif)194 int rt2x00mac_add_interface(struct ieee80211_hw *hw,
195 struct ieee80211_vif *vif)
196 {
197 struct rt2x00_dev *rt2x00dev = hw->priv;
198 struct rt2x00_intf *intf = vif_to_intf(vif);
199 struct data_queue *queue = rt2x00dev->bcn;
200 struct queue_entry *entry = NULL;
201 unsigned int i;
202
203 /*
204 * Don't allow interfaces to be added
205 * the device has disappeared.
206 */
207 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
208 !test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
209 return -ENODEV;
210
211 /*
212 * Loop through all beacon queues to find a free
213 * entry. Since there are as much beacon entries
214 * as the maximum interfaces, this search shouldn't
215 * fail.
216 */
217 for (i = 0; i < queue->limit; i++) {
218 entry = &queue->entries[i];
219 if (!test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
220 break;
221 }
222
223 if (unlikely(i == queue->limit))
224 return -ENOBUFS;
225
226 /*
227 * We are now absolutely sure the interface can be created,
228 * increase interface count and start initialization.
229 */
230
231 if (vif->type == NL80211_IFTYPE_AP)
232 rt2x00dev->intf_ap_count++;
233 else
234 rt2x00dev->intf_sta_count++;
235
236 mutex_init(&intf->beacon_skb_mutex);
237 intf->beacon = entry;
238
239 /*
240 * The MAC address must be configured after the device
241 * has been initialized. Otherwise the device can reset
242 * the MAC registers.
243 * The BSSID address must only be configured in AP mode,
244 * however we should not send an empty BSSID address for
245 * STA interfaces at this time, since this can cause
246 * invalid behavior in the device.
247 */
248 rt2x00lib_config_intf(rt2x00dev, intf, vif->type,
249 vif->addr, NULL);
250
251 /*
252 * Some filters depend on the current working mode. We can force
253 * an update during the next configure_filter() run by mac80211 by
254 * resetting the current packet_filter state.
255 */
256 rt2x00dev->packet_filter = 0;
257
258 return 0;
259 }
260 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
261
rt2x00mac_remove_interface(struct ieee80211_hw * hw,struct ieee80211_vif * vif)262 void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
263 struct ieee80211_vif *vif)
264 {
265 struct rt2x00_dev *rt2x00dev = hw->priv;
266 struct rt2x00_intf *intf = vif_to_intf(vif);
267
268 /*
269 * Don't allow interfaces to be remove while
270 * either the device has disappeared or when
271 * no interface is present.
272 */
273 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
274 (vif->type == NL80211_IFTYPE_AP && !rt2x00dev->intf_ap_count) ||
275 (vif->type != NL80211_IFTYPE_AP && !rt2x00dev->intf_sta_count))
276 return;
277
278 if (vif->type == NL80211_IFTYPE_AP)
279 rt2x00dev->intf_ap_count--;
280 else
281 rt2x00dev->intf_sta_count--;
282
283 /*
284 * Release beacon entry so it is available for
285 * new interfaces again.
286 */
287 clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);
288
289 /*
290 * Make sure the bssid and mac address registers
291 * are cleared to prevent false ACKing of frames.
292 */
293 rt2x00lib_config_intf(rt2x00dev, intf,
294 NL80211_IFTYPE_UNSPECIFIED, NULL, NULL);
295 }
296 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
297
rt2x00mac_config(struct ieee80211_hw * hw,u32 changed)298 int rt2x00mac_config(struct ieee80211_hw *hw, u32 changed)
299 {
300 struct rt2x00_dev *rt2x00dev = hw->priv;
301 struct ieee80211_conf *conf = &hw->conf;
302
303 /*
304 * mac80211 might be calling this function while we are trying
305 * to remove the device or perhaps suspending it.
306 */
307 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
308 return 0;
309
310 /*
311 * Some configuration parameters (e.g. channel and antenna values) can
312 * only be set when the radio is enabled, but do require the RX to
313 * be off. During this period we should keep link tuning enabled,
314 * if for any reason the link tuner must be reset, this will be
315 * handled by rt2x00lib_config().
316 */
317 rt2x00queue_stop_queue(rt2x00dev->rx);
318
319 /* Do not race with with link tuner. */
320 mutex_lock(&rt2x00dev->conf_mutex);
321
322 /*
323 * When we've just turned on the radio, we want to reprogram
324 * everything to ensure a consistent state
325 */
326 rt2x00lib_config(rt2x00dev, conf, changed);
327
328 /*
329 * After the radio has been enabled we need to configure
330 * the antenna to the default settings. rt2x00lib_config_antenna()
331 * should determine if any action should be taken based on
332 * checking if diversity has been enabled or no antenna changes
333 * have been made since the last configuration change.
334 */
335 rt2x00lib_config_antenna(rt2x00dev, rt2x00dev->default_ant);
336
337 mutex_unlock(&rt2x00dev->conf_mutex);
338
339 /* Turn RX back on */
340 rt2x00queue_start_queue(rt2x00dev->rx);
341
342 return 0;
343 }
344 EXPORT_SYMBOL_GPL(rt2x00mac_config);
345
rt2x00mac_configure_filter(struct ieee80211_hw * hw,unsigned int changed_flags,unsigned int * total_flags,u64 multicast)346 void rt2x00mac_configure_filter(struct ieee80211_hw *hw,
347 unsigned int changed_flags,
348 unsigned int *total_flags,
349 u64 multicast)
350 {
351 struct rt2x00_dev *rt2x00dev = hw->priv;
352
353 /*
354 * Mask off any flags we are going to ignore
355 * from the total_flags field.
356 */
357 *total_flags &=
358 FIF_ALLMULTI |
359 FIF_FCSFAIL |
360 FIF_PLCPFAIL |
361 FIF_CONTROL |
362 FIF_PSPOLL |
363 FIF_OTHER_BSS;
364
365 /*
366 * Apply some rules to the filters:
367 * - Some filters imply different filters to be set.
368 * - Some things we can't filter out at all.
369 * - Multicast filter seems to kill broadcast traffic so never use it.
370 */
371 *total_flags |= FIF_ALLMULTI;
372
373 /*
374 * If the device has a single filter for all control frames,
375 * FIF_CONTROL and FIF_PSPOLL flags imply each other.
376 * And if the device has more than one filter for control frames
377 * of different types, but has no a separate filter for PS Poll frames,
378 * FIF_CONTROL flag implies FIF_PSPOLL.
379 */
380 if (!rt2x00_has_cap_control_filters(rt2x00dev)) {
381 if (*total_flags & FIF_CONTROL || *total_flags & FIF_PSPOLL)
382 *total_flags |= FIF_CONTROL | FIF_PSPOLL;
383 }
384 if (!rt2x00_has_cap_control_filter_pspoll(rt2x00dev)) {
385 if (*total_flags & FIF_CONTROL)
386 *total_flags |= FIF_PSPOLL;
387 }
388
389 rt2x00dev->packet_filter = *total_flags;
390
391 rt2x00dev->ops->lib->config_filter(rt2x00dev, *total_flags);
392 }
393 EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter);
394
rt2x00mac_set_tim_iter(void * data,u8 * mac,struct ieee80211_vif * vif)395 static void rt2x00mac_set_tim_iter(void *data, u8 *mac,
396 struct ieee80211_vif *vif)
397 {
398 struct rt2x00_intf *intf = vif_to_intf(vif);
399
400 if (vif->type != NL80211_IFTYPE_AP &&
401 vif->type != NL80211_IFTYPE_ADHOC &&
402 vif->type != NL80211_IFTYPE_MESH_POINT &&
403 vif->type != NL80211_IFTYPE_WDS)
404 return;
405
406 set_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags);
407 }
408
rt2x00mac_set_tim(struct ieee80211_hw * hw,struct ieee80211_sta * sta,bool set)409 int rt2x00mac_set_tim(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
410 bool set)
411 {
412 struct rt2x00_dev *rt2x00dev = hw->priv;
413
414 if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
415 return 0;
416
417 ieee80211_iterate_active_interfaces_atomic(
418 rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
419 rt2x00mac_set_tim_iter, rt2x00dev);
420
421 /* queue work to upodate the beacon template */
422 ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->intf_work);
423 return 0;
424 }
425 EXPORT_SYMBOL_GPL(rt2x00mac_set_tim);
426
427 #ifdef CONFIG_RT2X00_LIB_CRYPTO
memcpy_tkip(struct rt2x00lib_crypto * crypto,u8 * key,u8 key_len)428 static void memcpy_tkip(struct rt2x00lib_crypto *crypto, u8 *key, u8 key_len)
429 {
430 if (key_len > NL80211_TKIP_DATA_OFFSET_ENCR_KEY)
431 memcpy(crypto->key,
432 &key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY],
433 sizeof(crypto->key));
434
435 if (key_len > NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY)
436 memcpy(crypto->tx_mic,
437 &key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY],
438 sizeof(crypto->tx_mic));
439
440 if (key_len > NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY)
441 memcpy(crypto->rx_mic,
442 &key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY],
443 sizeof(crypto->rx_mic));
444 }
445
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)446 int rt2x00mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
447 struct ieee80211_vif *vif, struct ieee80211_sta *sta,
448 struct ieee80211_key_conf *key)
449 {
450 struct rt2x00_dev *rt2x00dev = hw->priv;
451 int (*set_key) (struct rt2x00_dev *rt2x00dev,
452 struct rt2x00lib_crypto *crypto,
453 struct ieee80211_key_conf *key);
454 struct rt2x00lib_crypto crypto;
455 static const u8 bcast_addr[ETH_ALEN] =
456 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, };
457 struct rt2x00_sta *sta_priv = NULL;
458
459 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
460 return 0;
461
462 if (!rt2x00_has_cap_hw_crypto(rt2x00dev))
463 return -EOPNOTSUPP;
464
465 /*
466 * To support IBSS RSN, don't program group keys in IBSS, the
467 * hardware will then not attempt to decrypt the frames.
468 */
469 if (vif->type == NL80211_IFTYPE_ADHOC &&
470 !(key->flags & IEEE80211_KEY_FLAG_PAIRWISE))
471 return -EOPNOTSUPP;
472
473 if (key->keylen > 32)
474 return -ENOSPC;
475
476 memset(&crypto, 0, sizeof(crypto));
477
478 crypto.bssidx = rt2x00lib_get_bssidx(rt2x00dev, vif);
479 crypto.cipher = rt2x00crypto_key_to_cipher(key);
480 if (crypto.cipher == CIPHER_NONE)
481 return -EOPNOTSUPP;
482 if (crypto.cipher == CIPHER_TKIP && rt2x00_is_usb(rt2x00dev))
483 return -EOPNOTSUPP;
484
485 crypto.cmd = cmd;
486
487 if (sta) {
488 crypto.address = sta->addr;
489 sta_priv = sta_to_rt2x00_sta(sta);
490 crypto.wcid = sta_priv->wcid;
491 } else
492 crypto.address = bcast_addr;
493
494 if (crypto.cipher == CIPHER_TKIP)
495 memcpy_tkip(&crypto, &key->key[0], key->keylen);
496 else
497 memcpy(crypto.key, &key->key[0], key->keylen);
498 /*
499 * Each BSS has a maximum of 4 shared keys.
500 * Shared key index values:
501 * 0) BSS0 key0
502 * 1) BSS0 key1
503 * ...
504 * 4) BSS1 key0
505 * ...
506 * 8) BSS2 key0
507 * ...
508 * Both pairwise as shared key indeces are determined by
509 * driver. This is required because the hardware requires
510 * keys to be assigned in correct order (When key 1 is
511 * provided but key 0 is not, then the key is not found
512 * by the hardware during RX).
513 */
514 if (cmd == SET_KEY)
515 key->hw_key_idx = 0;
516
517 if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
518 set_key = rt2x00dev->ops->lib->config_pairwise_key;
519 else
520 set_key = rt2x00dev->ops->lib->config_shared_key;
521
522 if (!set_key)
523 return -EOPNOTSUPP;
524
525 return set_key(rt2x00dev, &crypto, key);
526 }
527 EXPORT_SYMBOL_GPL(rt2x00mac_set_key);
528 #endif /* CONFIG_RT2X00_LIB_CRYPTO */
529
rt2x00mac_sw_scan_start(struct ieee80211_hw * hw,struct ieee80211_vif * vif,const u8 * mac_addr)530 void rt2x00mac_sw_scan_start(struct ieee80211_hw *hw,
531 struct ieee80211_vif *vif,
532 const u8 *mac_addr)
533 {
534 struct rt2x00_dev *rt2x00dev = hw->priv;
535 set_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
536 rt2x00link_stop_tuner(rt2x00dev);
537 }
538 EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_start);
539
rt2x00mac_sw_scan_complete(struct ieee80211_hw * hw,struct ieee80211_vif * vif)540 void rt2x00mac_sw_scan_complete(struct ieee80211_hw *hw,
541 struct ieee80211_vif *vif)
542 {
543 struct rt2x00_dev *rt2x00dev = hw->priv;
544 clear_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
545 rt2x00link_start_tuner(rt2x00dev);
546 }
547 EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_complete);
548
rt2x00mac_get_stats(struct ieee80211_hw * hw,struct ieee80211_low_level_stats * stats)549 int rt2x00mac_get_stats(struct ieee80211_hw *hw,
550 struct ieee80211_low_level_stats *stats)
551 {
552 struct rt2x00_dev *rt2x00dev = hw->priv;
553
554 /*
555 * The dot11ACKFailureCount, dot11RTSFailureCount and
556 * dot11RTSSuccessCount are updated in interrupt time.
557 * dot11FCSErrorCount is updated in the link tuner.
558 */
559 memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
560
561 return 0;
562 }
563 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
564
rt2x00mac_bss_info_changed(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_bss_conf * bss_conf,u32 changes)565 void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
566 struct ieee80211_vif *vif,
567 struct ieee80211_bss_conf *bss_conf,
568 u32 changes)
569 {
570 struct rt2x00_dev *rt2x00dev = hw->priv;
571 struct rt2x00_intf *intf = vif_to_intf(vif);
572
573 /*
574 * mac80211 might be calling this function while we are trying
575 * to remove the device or perhaps suspending it.
576 */
577 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
578 return;
579
580 /*
581 * Update the BSSID.
582 */
583 if (changes & BSS_CHANGED_BSSID)
584 rt2x00lib_config_intf(rt2x00dev, intf, vif->type, NULL,
585 bss_conf->bssid);
586
587 /*
588 * Start/stop beaconing.
589 */
590 if (changes & BSS_CHANGED_BEACON_ENABLED) {
591 mutex_lock(&intf->beacon_skb_mutex);
592 if (!bss_conf->enable_beacon && intf->enable_beacon) {
593 rt2x00dev->intf_beaconing--;
594 intf->enable_beacon = false;
595
596 if (rt2x00dev->intf_beaconing == 0) {
597 /*
598 * Last beaconing interface disabled
599 * -> stop beacon queue.
600 */
601 rt2x00queue_stop_queue(rt2x00dev->bcn);
602 }
603 /*
604 * Clear beacon in the H/W for this vif. This is needed
605 * to disable beaconing on this particular interface
606 * and keep it running on other interfaces.
607 */
608 rt2x00queue_clear_beacon(rt2x00dev, vif);
609 } else if (bss_conf->enable_beacon && !intf->enable_beacon) {
610 rt2x00dev->intf_beaconing++;
611 intf->enable_beacon = true;
612 /*
613 * Upload beacon to the H/W. This is only required on
614 * USB devices. PCI devices fetch beacons periodically.
615 */
616 if (rt2x00_is_usb(rt2x00dev))
617 rt2x00queue_update_beacon(rt2x00dev, vif);
618
619 if (rt2x00dev->intf_beaconing == 1) {
620 /*
621 * First beaconing interface enabled
622 * -> start beacon queue.
623 */
624 rt2x00queue_start_queue(rt2x00dev->bcn);
625 }
626 }
627 mutex_unlock(&intf->beacon_skb_mutex);
628 }
629
630 /*
631 * When the association status has changed we must reset the link
632 * tuner counter. This is because some drivers determine if they
633 * should perform link tuning based on the number of seconds
634 * while associated or not associated.
635 */
636 if (changes & BSS_CHANGED_ASSOC) {
637 rt2x00dev->link.count = 0;
638
639 if (bss_conf->assoc)
640 rt2x00dev->intf_associated++;
641 else
642 rt2x00dev->intf_associated--;
643
644 rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
645
646 clear_bit(CONFIG_QOS_DISABLED, &rt2x00dev->flags);
647 }
648
649 /*
650 * Check for access point which do not support 802.11e . We have to
651 * generate data frames sequence number in S/W for such AP, because
652 * of H/W bug.
653 */
654 if (changes & BSS_CHANGED_QOS && !bss_conf->qos)
655 set_bit(CONFIG_QOS_DISABLED, &rt2x00dev->flags);
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 tx_queue_for_each(rt2x00dev, queue)
724 rt2x00queue_flush_queue(queue, drop);
725 }
726 EXPORT_SYMBOL_GPL(rt2x00mac_flush);
727
rt2x00mac_set_antenna(struct ieee80211_hw * hw,u32 tx_ant,u32 rx_ant)728 int rt2x00mac_set_antenna(struct ieee80211_hw *hw, u32 tx_ant, u32 rx_ant)
729 {
730 struct rt2x00_dev *rt2x00dev = hw->priv;
731 struct link_ant *ant = &rt2x00dev->link.ant;
732 struct antenna_setup *def = &rt2x00dev->default_ant;
733 struct antenna_setup setup;
734
735 // The antenna value is not supposed to be 0,
736 // or exceed the maximum number of antenna's.
737 if (!tx_ant || (tx_ant & ~3) || !rx_ant || (rx_ant & ~3))
738 return -EINVAL;
739
740 // When the client tried to configure the antenna to or from
741 // diversity mode, we must reset the default antenna as well
742 // as that controls the diversity switch.
743 if (ant->flags & ANTENNA_TX_DIVERSITY && tx_ant != 3)
744 ant->flags &= ~ANTENNA_TX_DIVERSITY;
745 if (ant->flags & ANTENNA_RX_DIVERSITY && rx_ant != 3)
746 ant->flags &= ~ANTENNA_RX_DIVERSITY;
747
748 // If diversity is being enabled, check if we need hardware
749 // or software diversity. In the latter case, reset the value,
750 // and make sure we update the antenna flags to have the
751 // link tuner pick up the diversity tuning.
752 if (tx_ant == 3 && def->tx == ANTENNA_SW_DIVERSITY) {
753 tx_ant = ANTENNA_SW_DIVERSITY;
754 ant->flags |= ANTENNA_TX_DIVERSITY;
755 }
756
757 if (rx_ant == 3 && def->rx == ANTENNA_SW_DIVERSITY) {
758 rx_ant = ANTENNA_SW_DIVERSITY;
759 ant->flags |= ANTENNA_RX_DIVERSITY;
760 }
761
762 setup.tx = tx_ant;
763 setup.rx = rx_ant;
764 setup.rx_chain_num = 0;
765 setup.tx_chain_num = 0;
766
767 rt2x00lib_config_antenna(rt2x00dev, setup);
768
769 return 0;
770 }
771 EXPORT_SYMBOL_GPL(rt2x00mac_set_antenna);
772
rt2x00mac_get_antenna(struct ieee80211_hw * hw,u32 * tx_ant,u32 * rx_ant)773 int rt2x00mac_get_antenna(struct ieee80211_hw *hw, u32 *tx_ant, u32 *rx_ant)
774 {
775 struct rt2x00_dev *rt2x00dev = hw->priv;
776 struct link_ant *ant = &rt2x00dev->link.ant;
777 struct antenna_setup *active = &rt2x00dev->link.ant.active;
778
779 // When software diversity is active, we must report this to the
780 // client and not the current active antenna state.
781 if (ant->flags & ANTENNA_TX_DIVERSITY)
782 *tx_ant = ANTENNA_HW_DIVERSITY;
783 else
784 *tx_ant = active->tx;
785
786 if (ant->flags & ANTENNA_RX_DIVERSITY)
787 *rx_ant = ANTENNA_HW_DIVERSITY;
788 else
789 *rx_ant = active->rx;
790
791 return 0;
792 }
793 EXPORT_SYMBOL_GPL(rt2x00mac_get_antenna);
794
rt2x00mac_get_ringparam(struct ieee80211_hw * hw,u32 * tx,u32 * tx_max,u32 * rx,u32 * rx_max)795 void rt2x00mac_get_ringparam(struct ieee80211_hw *hw,
796 u32 *tx, u32 *tx_max, u32 *rx, u32 *rx_max)
797 {
798 struct rt2x00_dev *rt2x00dev = hw->priv;
799 struct data_queue *queue;
800
801 tx_queue_for_each(rt2x00dev, queue) {
802 *tx += queue->length;
803 *tx_max += queue->limit;
804 }
805
806 *rx = rt2x00dev->rx->length;
807 *rx_max = rt2x00dev->rx->limit;
808 }
809 EXPORT_SYMBOL_GPL(rt2x00mac_get_ringparam);
810
rt2x00mac_tx_frames_pending(struct ieee80211_hw * hw)811 bool rt2x00mac_tx_frames_pending(struct ieee80211_hw *hw)
812 {
813 struct rt2x00_dev *rt2x00dev = hw->priv;
814 struct data_queue *queue;
815
816 tx_queue_for_each(rt2x00dev, queue) {
817 if (!rt2x00queue_empty(queue))
818 return true;
819 }
820
821 return false;
822 }
823 EXPORT_SYMBOL_GPL(rt2x00mac_tx_frames_pending);
824
