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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
30static 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
100void 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 test_bit(REQUIRE_ATIM_QUEUE, &rt2x00dev->cap_flags))
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 goto exit_fail;
147
148 if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb))
149 goto exit_fail;
150 }
151
152 if (unlikely(rt2x00queue_write_tx_frame(queue, skb, control->sta, false)))
153 goto exit_fail;
154
155 /*
156 * Pausing queue has to be serialized with rt2x00lib_txdone(). Note
157 * we should not use spin_lock_bh variant as bottom halve was already
158 * disabled before ieee80211_xmit() call.
159 */
160 spin_lock(&queue->tx_lock);
161 if (rt2x00queue_threshold(queue))
162 rt2x00queue_pause_queue(queue);
163 spin_unlock(&queue->tx_lock);
164
165 return;
166
167 exit_fail:
168 spin_lock(&queue->tx_lock);
169 rt2x00queue_pause_queue(queue);
170 spin_unlock(&queue->tx_lock);
171 exit_free_skb:
172 ieee80211_free_txskb(hw, skb);
173}
174EXPORT_SYMBOL_GPL(rt2x00mac_tx);
175
176int rt2x00mac_start(struct ieee80211_hw *hw)
177{
178 struct rt2x00_dev *rt2x00dev = hw->priv;
179
180 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
181 return 0;
182
183 return rt2x00lib_start(rt2x00dev);
184}
185EXPORT_SYMBOL_GPL(rt2x00mac_start);
186
187void rt2x00mac_stop(struct ieee80211_hw *hw)
188{
189 struct rt2x00_dev *rt2x00dev = hw->priv;
190
191 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
192 return;
193
194 rt2x00lib_stop(rt2x00dev);
195}
196EXPORT_SYMBOL_GPL(rt2x00mac_stop);
197
198int rt2x00mac_add_interface(struct ieee80211_hw *hw,
199 struct ieee80211_vif *vif)
200{
201 struct rt2x00_dev *rt2x00dev = hw->priv;
202 struct rt2x00_intf *intf = vif_to_intf(vif);
203 struct data_queue *queue = rt2x00dev->bcn;
204 struct queue_entry *entry = NULL;
205 unsigned int i;
206
207 /*
208 * Don't allow interfaces to be added
209 * the device has disappeared.
210 */
211 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
212 !test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
213 return -ENODEV;
214
215 /*
216 * Loop through all beacon queues to find a free
217 * entry. Since there are as much beacon entries
218 * as the maximum interfaces, this search shouldn't
219 * fail.
220 */
221 for (i = 0; i < queue->limit; i++) {
222 entry = &queue->entries[i];
223 if (!test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
224 break;
225 }
226
227 if (unlikely(i == queue->limit))
228 return -ENOBUFS;
229
230 /*
231 * We are now absolutely sure the interface can be created,
232 * increase interface count and start initialization.
233 */
234
235 if (vif->type == NL80211_IFTYPE_AP)
236 rt2x00dev->intf_ap_count++;
237 else
238 rt2x00dev->intf_sta_count++;
239
240 mutex_init(&intf->beacon_skb_mutex);
241 intf->beacon = entry;
242
243 /*
244 * The MAC address must be configured after the device
245 * has been initialized. Otherwise the device can reset
246 * the MAC registers.
247 * The BSSID address must only be configured in AP mode,
248 * however we should not send an empty BSSID address for
249 * STA interfaces at this time, since this can cause
250 * invalid behavior in the device.
251 */
252 rt2x00lib_config_intf(rt2x00dev, intf, vif->type,
253 vif->addr, NULL);
254
255 /*
256 * Some filters depend on the current working mode. We can force
257 * an update during the next configure_filter() run by mac80211 by
258 * resetting the current packet_filter state.
259 */
260 rt2x00dev->packet_filter = 0;
261
262 return 0;
263}
264EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
265
266void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
267 struct ieee80211_vif *vif)
268{
269 struct rt2x00_dev *rt2x00dev = hw->priv;
270 struct rt2x00_intf *intf = vif_to_intf(vif);
271
272 /*
273 * Don't allow interfaces to be remove while
274 * either the device has disappeared or when
275 * no interface is present.
276 */
277 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
278 (vif->type == NL80211_IFTYPE_AP && !rt2x00dev->intf_ap_count) ||
279 (vif->type != NL80211_IFTYPE_AP && !rt2x00dev->intf_sta_count))
280 return;
281
282 if (vif->type == NL80211_IFTYPE_AP)
283 rt2x00dev->intf_ap_count--;
284 else
285 rt2x00dev->intf_sta_count--;
286
287 /*
288 * Release beacon entry so it is available for
289 * new interfaces again.
290 */
291 clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);
292
293 /*
294 * Make sure the bssid and mac address registers
295 * are cleared to prevent false ACKing of frames.
296 */
297 rt2x00lib_config_intf(rt2x00dev, intf,
298 NL80211_IFTYPE_UNSPECIFIED, NULL, NULL);
299}
300EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
301
302int rt2x00mac_config(struct ieee80211_hw *hw, u32 changed)
303{
304 struct rt2x00_dev *rt2x00dev = hw->priv;
305 struct ieee80211_conf *conf = &hw->conf;
306
307 /*
308 * mac80211 might be calling this function while we are trying
309 * to remove the device or perhaps suspending it.
310 */
311 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
312 return 0;
313
314 /*
315 * Some configuration parameters (e.g. channel and antenna values) can
316 * only be set when the radio is enabled, but do require the RX to
317 * be off. During this period we should keep link tuning enabled,
318 * if for any reason the link tuner must be reset, this will be
319 * handled by rt2x00lib_config().
320 */
321 rt2x00queue_stop_queue(rt2x00dev->rx);
322
323 /*
324 * When we've just turned on the radio, we want to reprogram
325 * everything to ensure a consistent state
326 */
327 rt2x00lib_config(rt2x00dev, conf, changed);
328
329 /*
330 * After the radio has been enabled we need to configure
331 * the antenna to the default settings. rt2x00lib_config_antenna()
332 * should determine if any action should be taken based on
333 * checking if diversity has been enabled or no antenna changes
334 * have been made since the last configuration change.
335 */
336 rt2x00lib_config_antenna(rt2x00dev, rt2x00dev->default_ant);
337
338 /* Turn RX back on */
339 rt2x00queue_start_queue(rt2x00dev->rx);
340
341 return 0;
342}
343EXPORT_SYMBOL_GPL(rt2x00mac_config);
344
345void rt2x00mac_configure_filter(struct ieee80211_hw *hw,
346 unsigned int changed_flags,
347 unsigned int *total_flags,
348 u64 multicast)
349{
350 struct rt2x00_dev *rt2x00dev = hw->priv;
351
352 /*
353 * Mask off any flags we are going to ignore
354 * from the total_flags field.
355 */
356 *total_flags &=
357 FIF_ALLMULTI |
358 FIF_FCSFAIL |
359 FIF_PLCPFAIL |
360 FIF_CONTROL |
361 FIF_PSPOLL |
362 FIF_OTHER_BSS |
363 FIF_PROMISC_IN_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 if (*total_flags & FIF_OTHER_BSS ||
373 *total_flags & FIF_PROMISC_IN_BSS)
374 *total_flags |= FIF_PROMISC_IN_BSS | FIF_OTHER_BSS;
375
376 /*
377 * If the device has a single filter for all control frames,
378 * FIF_CONTROL and FIF_PSPOLL flags imply each other.
379 * And if the device has more than one filter for control frames
380 * of different types, but has no a separate filter for PS Poll frames,
381 * FIF_CONTROL flag implies FIF_PSPOLL.
382 */
383 if (!rt2x00_has_cap_control_filters(rt2x00dev)) {
384 if (*total_flags & FIF_CONTROL || *total_flags & FIF_PSPOLL)
385 *total_flags |= FIF_CONTROL | FIF_PSPOLL;
386 }
387 if (!rt2x00_has_cap_control_filter_pspoll(rt2x00dev)) {
388 if (*total_flags & FIF_CONTROL)
389 *total_flags |= FIF_PSPOLL;
390 }
391
392 /*
393 * Check if there is any work left for us.
394 */
395 if (rt2x00dev->packet_filter == *total_flags)
396 return;
397 rt2x00dev->packet_filter = *total_flags;
398
399 rt2x00dev->ops->lib->config_filter(rt2x00dev, *total_flags);
400}
401EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter);
402
403static void rt2x00mac_set_tim_iter(void *data, u8 *mac,
404 struct ieee80211_vif *vif)
405{
406 struct rt2x00_intf *intf = vif_to_intf(vif);
407
408 if (vif->type != NL80211_IFTYPE_AP &&
409 vif->type != NL80211_IFTYPE_ADHOC &&
410 vif->type != NL80211_IFTYPE_MESH_POINT &&
411 vif->type != NL80211_IFTYPE_WDS)
412 return;
413
414 set_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags);
415}
416
417int 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}
433EXPORT_SYMBOL_GPL(rt2x00mac_set_tim);
434
435#ifdef CONFIG_RT2X00_LIB_CRYPTO
436static 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
454int 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 if (!rt2x00_has_cap_hw_crypto(rt2x00dev))
471 return -EOPNOTSUPP;
472
473 /*
474 * To support IBSS RSN, don't program group keys in IBSS, the
475 * hardware will then not attempt to decrypt the frames.
476 */
477 if (vif->type == NL80211_IFTYPE_ADHOC &&
478 !(key->flags & IEEE80211_KEY_FLAG_PAIRWISE))
479 return -EOPNOTSUPP;
480
481 if (key->keylen > 32)
482 return -ENOSPC;
483
484 memset(&crypto, 0, sizeof(crypto));
485
486 crypto.bssidx = rt2x00lib_get_bssidx(rt2x00dev, vif);
487 crypto.cipher = rt2x00crypto_key_to_cipher(key);
488 if (crypto.cipher == CIPHER_NONE)
489 return -EOPNOTSUPP;
490
491 crypto.cmd = cmd;
492
493 if (sta) {
494 crypto.address = sta->addr;
495 sta_priv = sta_to_rt2x00_sta(sta);
496 crypto.wcid = sta_priv->wcid;
497 } else
498 crypto.address = bcast_addr;
499
500 if (crypto.cipher == CIPHER_TKIP)
501 memcpy_tkip(&crypto, &key->key[0], key->keylen);
502 else
503 memcpy(crypto.key, &key->key[0], key->keylen);
504 /*
505 * Each BSS has a maximum of 4 shared keys.
506 * Shared key index values:
507 * 0) BSS0 key0
508 * 1) BSS0 key1
509 * ...
510 * 4) BSS1 key0
511 * ...
512 * 8) BSS2 key0
513 * ...
514 * Both pairwise as shared key indeces are determined by
515 * driver. This is required because the hardware requires
516 * keys to be assigned in correct order (When key 1 is
517 * provided but key 0 is not, then the key is not found
518 * by the hardware during RX).
519 */
520 if (cmd == SET_KEY)
521 key->hw_key_idx = 0;
522
523 if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
524 set_key = rt2x00dev->ops->lib->config_pairwise_key;
525 else
526 set_key = rt2x00dev->ops->lib->config_shared_key;
527
528 if (!set_key)
529 return -EOPNOTSUPP;
530
531 return set_key(rt2x00dev, &crypto, key);
532}
533EXPORT_SYMBOL_GPL(rt2x00mac_set_key);
534#endif /* CONFIG_RT2X00_LIB_CRYPTO */
535
536int rt2x00mac_sta_add(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
537 struct ieee80211_sta *sta)
538{
539 struct rt2x00_dev *rt2x00dev = hw->priv;
540 struct rt2x00_sta *sta_priv = sta_to_rt2x00_sta(sta);
541
542 /*
543 * If there's no space left in the device table store
544 * -1 as wcid but tell mac80211 everything went ok.
545 */
546 if (rt2x00dev->ops->lib->sta_add(rt2x00dev, vif, sta))
547 sta_priv->wcid = -1;
548
549 return 0;
550}
551EXPORT_SYMBOL_GPL(rt2x00mac_sta_add);
552
553int rt2x00mac_sta_remove(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
554 struct ieee80211_sta *sta)
555{
556 struct rt2x00_dev *rt2x00dev = hw->priv;
557 struct rt2x00_sta *sta_priv = sta_to_rt2x00_sta(sta);
558
559 /*
560 * If we never sent the STA to the device no need to clean it up.
561 */
562 if (sta_priv->wcid < 0)
563 return 0;
564
565 return rt2x00dev->ops->lib->sta_remove(rt2x00dev, sta_priv->wcid);
566}
567EXPORT_SYMBOL_GPL(rt2x00mac_sta_remove);
568
569void rt2x00mac_sw_scan_start(struct ieee80211_hw *hw)
570{
571 struct rt2x00_dev *rt2x00dev = hw->priv;
572 set_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
573 rt2x00link_stop_tuner(rt2x00dev);
574}
575EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_start);
576
577void rt2x00mac_sw_scan_complete(struct ieee80211_hw *hw)
578{
579 struct rt2x00_dev *rt2x00dev = hw->priv;
580 clear_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
581 rt2x00link_start_tuner(rt2x00dev);
582}
583EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_complete);
584
585int rt2x00mac_get_stats(struct ieee80211_hw *hw,
586 struct ieee80211_low_level_stats *stats)
587{
588 struct rt2x00_dev *rt2x00dev = hw->priv;
589
590 /*
591 * The dot11ACKFailureCount, dot11RTSFailureCount and
592 * dot11RTSSuccessCount are updated in interrupt time.
593 * dot11FCSErrorCount is updated in the link tuner.
594 */
595 memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
596
597 return 0;
598}
599EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
600
601void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
602 struct ieee80211_vif *vif,
603 struct ieee80211_bss_conf *bss_conf,
604 u32 changes)
605{
606 struct rt2x00_dev *rt2x00dev = hw->priv;
607 struct rt2x00_intf *intf = vif_to_intf(vif);
608
609 /*
610 * mac80211 might be calling this function while we are trying
611 * to remove the device or perhaps suspending it.
612 */
613 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
614 return;
615
616 /*
617 * Update the BSSID.
618 */
619 if (changes & BSS_CHANGED_BSSID)
620 rt2x00lib_config_intf(rt2x00dev, intf, vif->type, NULL,
621 bss_conf->bssid);
622
623 /*
624 * Start/stop beaconing.
625 */
626 if (changes & BSS_CHANGED_BEACON_ENABLED) {
627 if (!bss_conf->enable_beacon && intf->enable_beacon) {
628 rt2x00dev->intf_beaconing--;
629 intf->enable_beacon = false;
630 /*
631 * Clear beacon in the H/W for this vif. This is needed
632 * to disable beaconing on this particular interface
633 * and keep it running on other interfaces.
634 */
635 rt2x00queue_clear_beacon(rt2x00dev, vif);
636
637 if (rt2x00dev->intf_beaconing == 0) {
638 /*
639 * Last beaconing interface disabled
640 * -> stop beacon queue.
641 */
642 mutex_lock(&intf->beacon_skb_mutex);
643 rt2x00queue_stop_queue(rt2x00dev->bcn);
644 mutex_unlock(&intf->beacon_skb_mutex);
645 }
646 } else if (bss_conf->enable_beacon && !intf->enable_beacon) {
647 rt2x00dev->intf_beaconing++;
648 intf->enable_beacon = true;
649 /*
650 * Upload beacon to the H/W. This is only required on
651 * USB devices. PCI devices fetch beacons periodically.
652 */
653 if (rt2x00_is_usb(rt2x00dev))
654 rt2x00queue_update_beacon(rt2x00dev, vif);
655
656 if (rt2x00dev->intf_beaconing == 1) {
657 /*
658 * First beaconing interface enabled
659 * -> start beacon queue.
660 */
661 mutex_lock(&intf->beacon_skb_mutex);
662 rt2x00queue_start_queue(rt2x00dev->bcn);
663 mutex_unlock(&intf->beacon_skb_mutex);
664 }
665 }
666 }
667
668 /*
669 * When the association status has changed we must reset the link
670 * tuner counter. This is because some drivers determine if they
671 * should perform link tuning based on the number of seconds
672 * while associated or not associated.
673 */
674 if (changes & BSS_CHANGED_ASSOC) {
675 rt2x00dev->link.count = 0;
676
677 if (bss_conf->assoc)
678 rt2x00dev->intf_associated++;
679 else
680 rt2x00dev->intf_associated--;
681
682 rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
683
684 clear_bit(CONFIG_QOS_DISABLED, &rt2x00dev->flags);
685 }
686
687 /*
688 * Check for access point which do not support 802.11e . We have to
689 * generate data frames sequence number in S/W for such AP, because
690 * of H/W bug.
691 */
692 if (changes & BSS_CHANGED_QOS && !bss_conf->qos)
693 set_bit(CONFIG_QOS_DISABLED, &rt2x00dev->flags);
694
695 /*
696 * When the erp information has changed, we should perform
697 * additional configuration steps. For all other changes we are done.
698 */
699 if (changes & (BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE |
700 BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BASIC_RATES |
701 BSS_CHANGED_BEACON_INT | BSS_CHANGED_HT))
702 rt2x00lib_config_erp(rt2x00dev, intf, bss_conf, changes);
703}
704EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
705
706int rt2x00mac_conf_tx(struct ieee80211_hw *hw,
707 struct ieee80211_vif *vif, u16 queue_idx,
708 const struct ieee80211_tx_queue_params *params)
709{
710 struct rt2x00_dev *rt2x00dev = hw->priv;
711 struct data_queue *queue;
712
713 queue = rt2x00queue_get_tx_queue(rt2x00dev, queue_idx);
714 if (unlikely(!queue))
715 return -EINVAL;
716
717 /*
718 * The passed variables are stored as real value ((2^n)-1).
719 * Ralink registers require to know the bit number 'n'.
720 */
721 if (params->cw_min > 0)
722 queue->cw_min = fls(params->cw_min);
723 else
724 queue->cw_min = 5; /* cw_min: 2^5 = 32. */
725
726 if (params->cw_max > 0)
727 queue->cw_max = fls(params->cw_max);
728 else
729 queue->cw_max = 10; /* cw_min: 2^10 = 1024. */
730
731 queue->aifs = params->aifs;
732 queue->txop = params->txop;
733
734 rt2x00_dbg(rt2x00dev,
735 "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d, TXop: %d\n",
736 queue_idx, queue->cw_min, queue->cw_max, queue->aifs,
737 queue->txop);
738
739 return 0;
740}
741EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);
742
743void rt2x00mac_rfkill_poll(struct ieee80211_hw *hw)
744{
745 struct rt2x00_dev *rt2x00dev = hw->priv;
746 bool active = !!rt2x00dev->ops->lib->rfkill_poll(rt2x00dev);
747
748 wiphy_rfkill_set_hw_state(hw->wiphy, !active);
749}
750EXPORT_SYMBOL_GPL(rt2x00mac_rfkill_poll);
751
752void rt2x00mac_flush(struct ieee80211_hw *hw, u32 queues, bool drop)
753{
754 struct rt2x00_dev *rt2x00dev = hw->priv;
755 struct data_queue *queue;
756
757 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
758 return;
759
760 tx_queue_for_each(rt2x00dev, queue)
761 rt2x00queue_flush_queue(queue, drop);
762}
763EXPORT_SYMBOL_GPL(rt2x00mac_flush);
764
765int rt2x00mac_set_antenna(struct ieee80211_hw *hw, u32 tx_ant, u32 rx_ant)
766{
767 struct rt2x00_dev *rt2x00dev = hw->priv;
768 struct link_ant *ant = &rt2x00dev->link.ant;
769 struct antenna_setup *def = &rt2x00dev->default_ant;
770 struct antenna_setup setup;
771
772 // The antenna value is not supposed to be 0,
773 // or exceed the maximum number of antenna's.
774 if (!tx_ant || (tx_ant & ~3) || !rx_ant || (rx_ant & ~3))
775 return -EINVAL;
776
777 // When the client tried to configure the antenna to or from
778 // diversity mode, we must reset the default antenna as well
779 // as that controls the diversity switch.
780 if (ant->flags & ANTENNA_TX_DIVERSITY && tx_ant != 3)
781 ant->flags &= ~ANTENNA_TX_DIVERSITY;
782 if (ant->flags & ANTENNA_RX_DIVERSITY && rx_ant != 3)
783 ant->flags &= ~ANTENNA_RX_DIVERSITY;
784
785 // If diversity is being enabled, check if we need hardware
786 // or software diversity. In the latter case, reset the value,
787 // and make sure we update the antenna flags to have the
788 // link tuner pick up the diversity tuning.
789 if (tx_ant == 3 && def->tx == ANTENNA_SW_DIVERSITY) {
790 tx_ant = ANTENNA_SW_DIVERSITY;
791 ant->flags |= ANTENNA_TX_DIVERSITY;
792 }
793
794 if (rx_ant == 3 && def->rx == ANTENNA_SW_DIVERSITY) {
795 rx_ant = ANTENNA_SW_DIVERSITY;
796 ant->flags |= ANTENNA_RX_DIVERSITY;
797 }
798
799 setup.tx = tx_ant;
800 setup.rx = rx_ant;
801
802 rt2x00lib_config_antenna(rt2x00dev, setup);
803
804 return 0;
805}
806EXPORT_SYMBOL_GPL(rt2x00mac_set_antenna);
807
808int rt2x00mac_get_antenna(struct ieee80211_hw *hw, u32 *tx_ant, u32 *rx_ant)
809{
810 struct rt2x00_dev *rt2x00dev = hw->priv;
811 struct link_ant *ant = &rt2x00dev->link.ant;
812 struct antenna_setup *active = &rt2x00dev->link.ant.active;
813
814 // When software diversity is active, we must report this to the
815 // client and not the current active antenna state.
816 if (ant->flags & ANTENNA_TX_DIVERSITY)
817 *tx_ant = ANTENNA_HW_DIVERSITY;
818 else
819 *tx_ant = active->tx;
820
821 if (ant->flags & ANTENNA_RX_DIVERSITY)
822 *rx_ant = ANTENNA_HW_DIVERSITY;
823 else
824 *rx_ant = active->rx;
825
826 return 0;
827}
828EXPORT_SYMBOL_GPL(rt2x00mac_get_antenna);
829
830void rt2x00mac_get_ringparam(struct ieee80211_hw *hw,
831 u32 *tx, u32 *tx_max, u32 *rx, u32 *rx_max)
832{
833 struct rt2x00_dev *rt2x00dev = hw->priv;
834 struct data_queue *queue;
835
836 tx_queue_for_each(rt2x00dev, queue) {
837 *tx += queue->length;
838 *tx_max += queue->limit;
839 }
840
841 *rx = rt2x00dev->rx->length;
842 *rx_max = rt2x00dev->rx->limit;
843}
844EXPORT_SYMBOL_GPL(rt2x00mac_get_ringparam);
845
846bool rt2x00mac_tx_frames_pending(struct ieee80211_hw *hw)
847{
848 struct rt2x00_dev *rt2x00dev = hw->priv;
849 struct data_queue *queue;
850
851 tx_queue_for_each(rt2x00dev, queue) {
852 if (!rt2x00queue_empty(queue))
853 return true;
854 }
855
856 return false;
857}
858EXPORT_SYMBOL_GPL(rt2x00mac_tx_frames_pending);