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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, write to the
17 Free Software Foundation, Inc.,
18 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 */
20
21/*
22 Module: rt2x00mac
23 Abstract: rt2x00 generic mac80211 routines.
24 */
25
26#include <linux/kernel.h>
27#include <linux/module.h>
28
29#include "rt2x00.h"
30#include "rt2x00lib.h"
31
32static int rt2x00mac_tx_rts_cts(struct rt2x00_dev *rt2x00dev,
33 struct data_queue *queue,
34 struct sk_buff *frag_skb)
35{
36 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(frag_skb);
37 struct ieee80211_tx_info *rts_info;
38 struct sk_buff *skb;
39 unsigned int data_length;
40 int retval = 0;
41
42 if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
43 data_length = sizeof(struct ieee80211_cts);
44 else
45 data_length = sizeof(struct ieee80211_rts);
46
47 skb = dev_alloc_skb(data_length + rt2x00dev->hw->extra_tx_headroom);
48 if (unlikely(!skb)) {
49 WARNING(rt2x00dev, "Failed to create RTS/CTS frame.\n");
50 return -ENOMEM;
51 }
52
53 skb_reserve(skb, rt2x00dev->hw->extra_tx_headroom);
54 skb_put(skb, data_length);
55
56 /*
57 * Copy TX information over from original frame to
58 * RTS/CTS frame. Note that we set the no encryption flag
59 * since we don't want this frame to be encrypted.
60 * RTS frames should be acked, while CTS-to-self frames
61 * should not. The ready for TX flag is cleared to prevent
62 * it being automatically send when the descriptor is
63 * written to the hardware.
64 */
65 memcpy(skb->cb, frag_skb->cb, sizeof(skb->cb));
66 rts_info = IEEE80211_SKB_CB(skb);
67 rts_info->control.rates[0].flags &= ~IEEE80211_TX_RC_USE_RTS_CTS;
68 rts_info->control.rates[0].flags &= ~IEEE80211_TX_RC_USE_CTS_PROTECT;
69
70 if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
71 rts_info->flags |= IEEE80211_TX_CTL_NO_ACK;
72 else
73 rts_info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
74
75 /* Disable hardware encryption */
76 rts_info->control.hw_key = NULL;
77
78 /*
79 * RTS/CTS frame should use the length of the frame plus any
80 * encryption overhead that will be added by the hardware.
81 */
82 data_length += rt2x00crypto_tx_overhead(rt2x00dev, skb);
83
84 if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
85 ieee80211_ctstoself_get(rt2x00dev->hw, tx_info->control.vif,
86 frag_skb->data, data_length, tx_info,
87 (struct ieee80211_cts *)(skb->data));
88 else
89 ieee80211_rts_get(rt2x00dev->hw, tx_info->control.vif,
90 frag_skb->data, data_length, tx_info,
91 (struct ieee80211_rts *)(skb->data));
92
93 retval = rt2x00queue_write_tx_frame(queue, skb, true);
94 if (retval) {
95 dev_kfree_skb_any(skb);
96 WARNING(rt2x00dev, "Failed to send RTS/CTS frame.\n");
97 }
98
99 return retval;
100}
101
102void rt2x00mac_tx(struct ieee80211_hw *hw, 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 ERROR(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, false)))
153 goto exit_fail;
154
155 if (rt2x00queue_threshold(queue))
156 rt2x00queue_pause_queue(queue);
157
158 return;
159
160 exit_fail:
161 rt2x00queue_pause_queue(queue);
162 exit_free_skb:
163 dev_kfree_skb_any(skb);
164}
165EXPORT_SYMBOL_GPL(rt2x00mac_tx);
166
167int rt2x00mac_start(struct ieee80211_hw *hw)
168{
169 struct rt2x00_dev *rt2x00dev = hw->priv;
170
171 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
172 return 0;
173
174 return rt2x00lib_start(rt2x00dev);
175}
176EXPORT_SYMBOL_GPL(rt2x00mac_start);
177
178void rt2x00mac_stop(struct ieee80211_hw *hw)
179{
180 struct rt2x00_dev *rt2x00dev = hw->priv;
181
182 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
183 return;
184
185 rt2x00lib_stop(rt2x00dev);
186}
187EXPORT_SYMBOL_GPL(rt2x00mac_stop);
188
189int rt2x00mac_add_interface(struct ieee80211_hw *hw,
190 struct ieee80211_vif *vif)
191{
192 struct rt2x00_dev *rt2x00dev = hw->priv;
193 struct rt2x00_intf *intf = vif_to_intf(vif);
194 struct data_queue *queue = rt2x00dev->bcn;
195 struct queue_entry *entry = NULL;
196 unsigned int i;
197
198 /*
199 * Don't allow interfaces to be added
200 * the device has disappeared.
201 */
202 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
203 !test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
204 return -ENODEV;
205
206 switch (vif->type) {
207 case NL80211_IFTYPE_AP:
208 /*
209 * We don't support mixed combinations of
210 * sta and ap interfaces.
211 */
212 if (rt2x00dev->intf_sta_count)
213 return -ENOBUFS;
214
215 /*
216 * Check if we exceeded the maximum amount
217 * of supported interfaces.
218 */
219 if (rt2x00dev->intf_ap_count >= rt2x00dev->ops->max_ap_intf)
220 return -ENOBUFS;
221
222 break;
223 case NL80211_IFTYPE_STATION:
224 case NL80211_IFTYPE_ADHOC:
225 case NL80211_IFTYPE_MESH_POINT:
226 case NL80211_IFTYPE_WDS:
227 /*
228 * We don't support mixed combinations of
229 * sta and ap interfaces.
230 */
231 if (rt2x00dev->intf_ap_count)
232 return -ENOBUFS;
233
234 /*
235 * Check if we exceeded the maximum amount
236 * of supported interfaces.
237 */
238 if (rt2x00dev->intf_sta_count >= rt2x00dev->ops->max_sta_intf)
239 return -ENOBUFS;
240
241 break;
242 default:
243 return -EINVAL;
244 }
245
246 /*
247 * Loop through all beacon queues to find a free
248 * entry. Since there are as much beacon entries
249 * as the maximum interfaces, this search shouldn't
250 * fail.
251 */
252 for (i = 0; i < queue->limit; i++) {
253 entry = &queue->entries[i];
254 if (!test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
255 break;
256 }
257
258 if (unlikely(i == queue->limit))
259 return -ENOBUFS;
260
261 /*
262 * We are now absolutely sure the interface can be created,
263 * increase interface count and start initialization.
264 */
265
266 if (vif->type == NL80211_IFTYPE_AP)
267 rt2x00dev->intf_ap_count++;
268 else
269 rt2x00dev->intf_sta_count++;
270
271 spin_lock_init(&intf->seqlock);
272 mutex_init(&intf->beacon_skb_mutex);
273 intf->beacon = entry;
274
275 /*
276 * The MAC address must be configured after the device
277 * has been initialized. Otherwise the device can reset
278 * the MAC registers.
279 * The BSSID address must only be configured in AP mode,
280 * however we should not send an empty BSSID address for
281 * STA interfaces at this time, since this can cause
282 * invalid behavior in the device.
283 */
284 rt2x00lib_config_intf(rt2x00dev, intf, vif->type,
285 vif->addr, NULL);
286
287 /*
288 * Some filters depend on the current working mode. We can force
289 * an update during the next configure_filter() run by mac80211 by
290 * resetting the current packet_filter state.
291 */
292 rt2x00dev->packet_filter = 0;
293
294 return 0;
295}
296EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
297
298void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
299 struct ieee80211_vif *vif)
300{
301 struct rt2x00_dev *rt2x00dev = hw->priv;
302 struct rt2x00_intf *intf = vif_to_intf(vif);
303
304 /*
305 * Don't allow interfaces to be remove while
306 * either the device has disappeared or when
307 * no interface is present.
308 */
309 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
310 (vif->type == NL80211_IFTYPE_AP && !rt2x00dev->intf_ap_count) ||
311 (vif->type != NL80211_IFTYPE_AP && !rt2x00dev->intf_sta_count))
312 return;
313
314 if (vif->type == NL80211_IFTYPE_AP)
315 rt2x00dev->intf_ap_count--;
316 else
317 rt2x00dev->intf_sta_count--;
318
319 /*
320 * Release beacon entry so it is available for
321 * new interfaces again.
322 */
323 clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);
324
325 /*
326 * Make sure the bssid and mac address registers
327 * are cleared to prevent false ACKing of frames.
328 */
329 rt2x00lib_config_intf(rt2x00dev, intf,
330 NL80211_IFTYPE_UNSPECIFIED, NULL, NULL);
331}
332EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
333
334int rt2x00mac_config(struct ieee80211_hw *hw, u32 changed)
335{
336 struct rt2x00_dev *rt2x00dev = hw->priv;
337 struct ieee80211_conf *conf = &hw->conf;
338
339 /*
340 * mac80211 might be calling this function while we are trying
341 * to remove the device or perhaps suspending it.
342 */
343 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
344 return 0;
345
346 /*
347 * Some configuration parameters (e.g. channel and antenna values) can
348 * only be set when the radio is enabled, but do require the RX to
349 * be off. During this period we should keep link tuning enabled,
350 * if for any reason the link tuner must be reset, this will be
351 * handled by rt2x00lib_config().
352 */
353 rt2x00queue_stop_queue(rt2x00dev->rx);
354
355 /*
356 * When we've just turned on the radio, we want to reprogram
357 * everything to ensure a consistent state
358 */
359 rt2x00lib_config(rt2x00dev, conf, changed);
360
361 /*
362 * After the radio has been enabled we need to configure
363 * the antenna to the default settings. rt2x00lib_config_antenna()
364 * should determine if any action should be taken based on
365 * checking if diversity has been enabled or no antenna changes
366 * have been made since the last configuration change.
367 */
368 rt2x00lib_config_antenna(rt2x00dev, rt2x00dev->default_ant);
369
370 /* Turn RX back on */
371 rt2x00queue_start_queue(rt2x00dev->rx);
372
373 return 0;
374}
375EXPORT_SYMBOL_GPL(rt2x00mac_config);
376
377void rt2x00mac_configure_filter(struct ieee80211_hw *hw,
378 unsigned int changed_flags,
379 unsigned int *total_flags,
380 u64 multicast)
381{
382 struct rt2x00_dev *rt2x00dev = hw->priv;
383
384 /*
385 * Mask off any flags we are going to ignore
386 * from the total_flags field.
387 */
388 *total_flags &=
389 FIF_ALLMULTI |
390 FIF_FCSFAIL |
391 FIF_PLCPFAIL |
392 FIF_CONTROL |
393 FIF_PSPOLL |
394 FIF_OTHER_BSS |
395 FIF_PROMISC_IN_BSS;
396
397 /*
398 * Apply some rules to the filters:
399 * - Some filters imply different filters to be set.
400 * - Some things we can't filter out at all.
401 * - Multicast filter seems to kill broadcast traffic so never use it.
402 */
403 *total_flags |= FIF_ALLMULTI;
404 if (*total_flags & FIF_OTHER_BSS ||
405 *total_flags & FIF_PROMISC_IN_BSS)
406 *total_flags |= FIF_PROMISC_IN_BSS | FIF_OTHER_BSS;
407
408 /*
409 * If the device has a single filter for all control frames,
410 * FIF_CONTROL and FIF_PSPOLL flags imply each other.
411 * And if the device has more than one filter for control frames
412 * of different types, but has no a separate filter for PS Poll frames,
413 * FIF_CONTROL flag implies FIF_PSPOLL.
414 */
415 if (!test_bit(CAPABILITY_CONTROL_FILTERS, &rt2x00dev->cap_flags)) {
416 if (*total_flags & FIF_CONTROL || *total_flags & FIF_PSPOLL)
417 *total_flags |= FIF_CONTROL | FIF_PSPOLL;
418 }
419 if (!test_bit(CAPABILITY_CONTROL_FILTER_PSPOLL, &rt2x00dev->cap_flags)) {
420 if (*total_flags & FIF_CONTROL)
421 *total_flags |= FIF_PSPOLL;
422 }
423
424 /*
425 * Check if there is any work left for us.
426 */
427 if (rt2x00dev->packet_filter == *total_flags)
428 return;
429 rt2x00dev->packet_filter = *total_flags;
430
431 rt2x00dev->ops->lib->config_filter(rt2x00dev, *total_flags);
432}
433EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter);
434
435static void rt2x00mac_set_tim_iter(void *data, u8 *mac,
436 struct ieee80211_vif *vif)
437{
438 struct rt2x00_intf *intf = vif_to_intf(vif);
439
440 if (vif->type != NL80211_IFTYPE_AP &&
441 vif->type != NL80211_IFTYPE_ADHOC &&
442 vif->type != NL80211_IFTYPE_MESH_POINT &&
443 vif->type != NL80211_IFTYPE_WDS)
444 return;
445
446 set_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags);
447}
448
449int rt2x00mac_set_tim(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
450 bool set)
451{
452 struct rt2x00_dev *rt2x00dev = hw->priv;
453
454 if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
455 return 0;
456
457 ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
458 rt2x00mac_set_tim_iter,
459 rt2x00dev);
460
461 /* queue work to upodate the beacon template */
462 ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->intf_work);
463 return 0;
464}
465EXPORT_SYMBOL_GPL(rt2x00mac_set_tim);
466
467#ifdef CONFIG_RT2X00_LIB_CRYPTO
468static void memcpy_tkip(struct rt2x00lib_crypto *crypto, u8 *key, u8 key_len)
469{
470 if (key_len > NL80211_TKIP_DATA_OFFSET_ENCR_KEY)
471 memcpy(crypto->key,
472 &key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY],
473 sizeof(crypto->key));
474
475 if (key_len > NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY)
476 memcpy(crypto->tx_mic,
477 &key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY],
478 sizeof(crypto->tx_mic));
479
480 if (key_len > NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY)
481 memcpy(crypto->rx_mic,
482 &key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY],
483 sizeof(crypto->rx_mic));
484}
485
486int rt2x00mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
487 struct ieee80211_vif *vif, struct ieee80211_sta *sta,
488 struct ieee80211_key_conf *key)
489{
490 struct rt2x00_dev *rt2x00dev = hw->priv;
491 int (*set_key) (struct rt2x00_dev *rt2x00dev,
492 struct rt2x00lib_crypto *crypto,
493 struct ieee80211_key_conf *key);
494 struct rt2x00lib_crypto crypto;
495 static const u8 bcast_addr[ETH_ALEN] =
496 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, };
497
498 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
499 return 0;
500 else if (!test_bit(CAPABILITY_HW_CRYPTO, &rt2x00dev->cap_flags))
501 return -EOPNOTSUPP;
502 else if (key->keylen > 32)
503 return -ENOSPC;
504
505 memset(&crypto, 0, sizeof(crypto));
506
507 /*
508 * When in STA mode, bssidx is always 0 otherwise local_address[5]
509 * contains the bss number, see BSS_ID_MASK comments for details.
510 */
511 if (rt2x00dev->intf_sta_count)
512 crypto.bssidx = 0;
513 else
514 crypto.bssidx = vif->addr[5] & (rt2x00dev->ops->max_ap_intf - 1);
515
516 crypto.cipher = rt2x00crypto_key_to_cipher(key);
517 if (crypto.cipher == CIPHER_NONE)
518 return -EOPNOTSUPP;
519
520 crypto.cmd = cmd;
521
522 if (sta)
523 crypto.address = sta->addr;
524 else
525 crypto.address = bcast_addr;
526
527 if (crypto.cipher == CIPHER_TKIP)
528 memcpy_tkip(&crypto, &key->key[0], key->keylen);
529 else
530 memcpy(crypto.key, &key->key[0], key->keylen);
531 /*
532 * Each BSS has a maximum of 4 shared keys.
533 * Shared key index values:
534 * 0) BSS0 key0
535 * 1) BSS0 key1
536 * ...
537 * 4) BSS1 key0
538 * ...
539 * 8) BSS2 key0
540 * ...
541 * Both pairwise as shared key indeces are determined by
542 * driver. This is required because the hardware requires
543 * keys to be assigned in correct order (When key 1 is
544 * provided but key 0 is not, then the key is not found
545 * by the hardware during RX).
546 */
547 if (cmd == SET_KEY)
548 key->hw_key_idx = 0;
549
550 if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
551 set_key = rt2x00dev->ops->lib->config_pairwise_key;
552 else
553 set_key = rt2x00dev->ops->lib->config_shared_key;
554
555 if (!set_key)
556 return -EOPNOTSUPP;
557
558 return set_key(rt2x00dev, &crypto, key);
559}
560EXPORT_SYMBOL_GPL(rt2x00mac_set_key);
561#endif /* CONFIG_RT2X00_LIB_CRYPTO */
562
563void rt2x00mac_sw_scan_start(struct ieee80211_hw *hw)
564{
565 struct rt2x00_dev *rt2x00dev = hw->priv;
566 set_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
567 rt2x00link_stop_tuner(rt2x00dev);
568}
569EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_start);
570
571void rt2x00mac_sw_scan_complete(struct ieee80211_hw *hw)
572{
573 struct rt2x00_dev *rt2x00dev = hw->priv;
574 clear_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
575 rt2x00link_start_tuner(rt2x00dev);
576}
577EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_complete);
578
579int rt2x00mac_get_stats(struct ieee80211_hw *hw,
580 struct ieee80211_low_level_stats *stats)
581{
582 struct rt2x00_dev *rt2x00dev = hw->priv;
583
584 /*
585 * The dot11ACKFailureCount, dot11RTSFailureCount and
586 * dot11RTSSuccessCount are updated in interrupt time.
587 * dot11FCSErrorCount is updated in the link tuner.
588 */
589 memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
590
591 return 0;
592}
593EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
594
595void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
596 struct ieee80211_vif *vif,
597 struct ieee80211_bss_conf *bss_conf,
598 u32 changes)
599{
600 struct rt2x00_dev *rt2x00dev = hw->priv;
601 struct rt2x00_intf *intf = vif_to_intf(vif);
602
603 /*
604 * mac80211 might be calling this function while we are trying
605 * to remove the device or perhaps suspending it.
606 */
607 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
608 return;
609
610 /*
611 * Update the BSSID.
612 */
613 if (changes & BSS_CHANGED_BSSID)
614 rt2x00lib_config_intf(rt2x00dev, intf, vif->type, NULL,
615 bss_conf->bssid);
616
617 /*
618 * Update the beacon. This is only required on USB devices. PCI
619 * devices fetch beacons periodically.
620 */
621 if (changes & BSS_CHANGED_BEACON && rt2x00_is_usb(rt2x00dev))
622 rt2x00queue_update_beacon(rt2x00dev, vif);
623
624 /*
625 * Start/stop beaconing.
626 */
627 if (changes & BSS_CHANGED_BEACON_ENABLED) {
628 if (!bss_conf->enable_beacon && intf->enable_beacon) {
629 rt2x00queue_clear_beacon(rt2x00dev, vif);
630 rt2x00dev->intf_beaconing--;
631 intf->enable_beacon = false;
632
633 if (rt2x00dev->intf_beaconing == 0) {
634 /*
635 * Last beaconing interface disabled
636 * -> stop beacon queue.
637 */
638 mutex_lock(&intf->beacon_skb_mutex);
639 rt2x00queue_stop_queue(rt2x00dev->bcn);
640 mutex_unlock(&intf->beacon_skb_mutex);
641 }
642
643
644 } else if (bss_conf->enable_beacon && !intf->enable_beacon) {
645 rt2x00dev->intf_beaconing++;
646 intf->enable_beacon = true;
647
648 if (rt2x00dev->intf_beaconing == 1) {
649 /*
650 * First beaconing interface enabled
651 * -> start beacon queue.
652 */
653 mutex_lock(&intf->beacon_skb_mutex);
654 rt2x00queue_start_queue(rt2x00dev->bcn);
655 mutex_unlock(&intf->beacon_skb_mutex);
656 }
657 }
658 }
659
660 /*
661 * When the association status has changed we must reset the link
662 * tuner counter. This is because some drivers determine if they
663 * should perform link tuning based on the number of seconds
664 * while associated or not associated.
665 */
666 if (changes & BSS_CHANGED_ASSOC) {
667 rt2x00dev->link.count = 0;
668
669 if (bss_conf->assoc)
670 rt2x00dev->intf_associated++;
671 else
672 rt2x00dev->intf_associated--;
673
674 rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
675 }
676
677 /*
678 * When the erp information has changed, we should perform
679 * additional configuration steps. For all other changes we are done.
680 */
681 if (changes & (BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE |
682 BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BASIC_RATES |
683 BSS_CHANGED_BEACON_INT | BSS_CHANGED_HT))
684 rt2x00lib_config_erp(rt2x00dev, intf, bss_conf, changes);
685}
686EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
687
688int rt2x00mac_conf_tx(struct ieee80211_hw *hw, u16 queue_idx,
689 const struct ieee80211_tx_queue_params *params)
690{
691 struct rt2x00_dev *rt2x00dev = hw->priv;
692 struct data_queue *queue;
693
694 queue = rt2x00queue_get_tx_queue(rt2x00dev, queue_idx);
695 if (unlikely(!queue))
696 return -EINVAL;
697
698 /*
699 * The passed variables are stored as real value ((2^n)-1).
700 * Ralink registers require to know the bit number 'n'.
701 */
702 if (params->cw_min > 0)
703 queue->cw_min = fls(params->cw_min);
704 else
705 queue->cw_min = 5; /* cw_min: 2^5 = 32. */
706
707 if (params->cw_max > 0)
708 queue->cw_max = fls(params->cw_max);
709 else
710 queue->cw_max = 10; /* cw_min: 2^10 = 1024. */
711
712 queue->aifs = params->aifs;
713 queue->txop = params->txop;
714
715 INFO(rt2x00dev,
716 "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d, TXop: %d.\n",
717 queue_idx, queue->cw_min, queue->cw_max, queue->aifs, queue->txop);
718
719 return 0;
720}
721EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);
722
723void rt2x00mac_rfkill_poll(struct ieee80211_hw *hw)
724{
725 struct rt2x00_dev *rt2x00dev = hw->priv;
726 bool active = !!rt2x00dev->ops->lib->rfkill_poll(rt2x00dev);
727
728 wiphy_rfkill_set_hw_state(hw->wiphy, !active);
729}
730EXPORT_SYMBOL_GPL(rt2x00mac_rfkill_poll);
731
732void rt2x00mac_flush(struct ieee80211_hw *hw, bool drop)
733{
734 struct rt2x00_dev *rt2x00dev = hw->priv;
735 struct data_queue *queue;
736
737 tx_queue_for_each(rt2x00dev, queue)
738 rt2x00queue_flush_queue(queue, drop);
739}
740EXPORT_SYMBOL_GPL(rt2x00mac_flush);
741
742int rt2x00mac_set_antenna(struct ieee80211_hw *hw, u32 tx_ant, u32 rx_ant)
743{
744 struct rt2x00_dev *rt2x00dev = hw->priv;
745 struct link_ant *ant = &rt2x00dev->link.ant;
746 struct antenna_setup *def = &rt2x00dev->default_ant;
747 struct antenna_setup setup;
748
749 // The antenna value is not supposed to be 0,
750 // or exceed the maximum number of antenna's.
751 if (!tx_ant || (tx_ant & ~3) || !rx_ant || (rx_ant & ~3))
752 return -EINVAL;
753
754 // When the client tried to configure the antenna to or from
755 // diversity mode, we must reset the default antenna as well
756 // as that controls the diversity switch.
757 if (ant->flags & ANTENNA_TX_DIVERSITY && tx_ant != 3)
758 ant->flags &= ~ANTENNA_TX_DIVERSITY;
759 if (ant->flags & ANTENNA_RX_DIVERSITY && rx_ant != 3)
760 ant->flags &= ~ANTENNA_RX_DIVERSITY;
761
762 // If diversity is being enabled, check if we need hardware
763 // or software diversity. In the latter case, reset the value,
764 // and make sure we update the antenna flags to have the
765 // link tuner pick up the diversity tuning.
766 if (tx_ant == 3 && def->tx == ANTENNA_SW_DIVERSITY) {
767 tx_ant = ANTENNA_SW_DIVERSITY;
768 ant->flags |= ANTENNA_TX_DIVERSITY;
769 }
770
771 if (rx_ant == 3 && def->rx == ANTENNA_SW_DIVERSITY) {
772 rx_ant = ANTENNA_SW_DIVERSITY;
773 ant->flags |= ANTENNA_RX_DIVERSITY;
774 }
775
776 setup.tx = tx_ant;
777 setup.rx = rx_ant;
778
779 rt2x00lib_config_antenna(rt2x00dev, setup);
780
781 return 0;
782}
783EXPORT_SYMBOL_GPL(rt2x00mac_set_antenna);
784
785int rt2x00mac_get_antenna(struct ieee80211_hw *hw, u32 *tx_ant, u32 *rx_ant)
786{
787 struct rt2x00_dev *rt2x00dev = hw->priv;
788 struct link_ant *ant = &rt2x00dev->link.ant;
789 struct antenna_setup *active = &rt2x00dev->link.ant.active;
790
791 // When software diversity is active, we must report this to the
792 // client and not the current active antenna state.
793 if (ant->flags & ANTENNA_TX_DIVERSITY)
794 *tx_ant = ANTENNA_HW_DIVERSITY;
795 else
796 *tx_ant = active->tx;
797
798 if (ant->flags & ANTENNA_RX_DIVERSITY)
799 *rx_ant = ANTENNA_HW_DIVERSITY;
800 else
801 *rx_ant = active->rx;
802
803 return 0;
804}
805EXPORT_SYMBOL_GPL(rt2x00mac_get_antenna);
806
807void rt2x00mac_get_ringparam(struct ieee80211_hw *hw,
808 u32 *tx, u32 *tx_max, u32 *rx, u32 *rx_max)
809{
810 struct rt2x00_dev *rt2x00dev = hw->priv;
811 struct data_queue *queue;
812
813 tx_queue_for_each(rt2x00dev, queue) {
814 *tx += queue->length;
815 *tx_max += queue->limit;
816 }
817
818 *rx = rt2x00dev->rx->length;
819 *rx_max = rt2x00dev->rx->limit;
820}
821EXPORT_SYMBOL_GPL(rt2x00mac_get_ringparam);
822
823bool rt2x00mac_tx_frames_pending(struct ieee80211_hw *hw)
824{
825 struct rt2x00_dev *rt2x00dev = hw->priv;
826 struct data_queue *queue;
827
828 tx_queue_for_each(rt2x00dev, queue) {
829 if (!rt2x00queue_empty(queue))
830 return true;
831 }
832
833 return false;
834}
835EXPORT_SYMBOL_GPL(rt2x00mac_tx_frames_pending);
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, write to the
17 Free Software Foundation, Inc.,
18 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 */
20
21/*
22 Module: rt2x00mac
23 Abstract: rt2x00 generic mac80211 routines.
24 */
25
26#include <linux/kernel.h>
27#include <linux/module.h>
28
29#include "rt2x00.h"
30#include "rt2x00lib.h"
31
32static int rt2x00mac_tx_rts_cts(struct rt2x00_dev *rt2x00dev,
33 struct data_queue *queue,
34 struct sk_buff *frag_skb)
35{
36 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(frag_skb);
37 struct ieee80211_tx_info *rts_info;
38 struct sk_buff *skb;
39 unsigned int data_length;
40 int retval = 0;
41
42 if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
43 data_length = sizeof(struct ieee80211_cts);
44 else
45 data_length = sizeof(struct ieee80211_rts);
46
47 skb = dev_alloc_skb(data_length + rt2x00dev->hw->extra_tx_headroom);
48 if (unlikely(!skb)) {
49 WARNING(rt2x00dev, "Failed to create RTS/CTS frame.\n");
50 return -ENOMEM;
51 }
52
53 skb_reserve(skb, rt2x00dev->hw->extra_tx_headroom);
54 skb_put(skb, data_length);
55
56 /*
57 * Copy TX information over from original frame to
58 * RTS/CTS frame. Note that we set the no encryption flag
59 * since we don't want this frame to be encrypted.
60 * RTS frames should be acked, while CTS-to-self frames
61 * should not. The ready for TX flag is cleared to prevent
62 * it being automatically send when the descriptor is
63 * written to the hardware.
64 */
65 memcpy(skb->cb, frag_skb->cb, sizeof(skb->cb));
66 rts_info = IEEE80211_SKB_CB(skb);
67 rts_info->control.rates[0].flags &= ~IEEE80211_TX_RC_USE_RTS_CTS;
68 rts_info->control.rates[0].flags &= ~IEEE80211_TX_RC_USE_CTS_PROTECT;
69
70 if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
71 rts_info->flags |= IEEE80211_TX_CTL_NO_ACK;
72 else
73 rts_info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
74
75 /* Disable hardware encryption */
76 rts_info->control.hw_key = NULL;
77
78 /*
79 * RTS/CTS frame should use the length of the frame plus any
80 * encryption overhead that will be added by the hardware.
81 */
82 data_length += rt2x00crypto_tx_overhead(rt2x00dev, skb);
83
84 if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
85 ieee80211_ctstoself_get(rt2x00dev->hw, tx_info->control.vif,
86 frag_skb->data, data_length, tx_info,
87 (struct ieee80211_cts *)(skb->data));
88 else
89 ieee80211_rts_get(rt2x00dev->hw, tx_info->control.vif,
90 frag_skb->data, data_length, tx_info,
91 (struct ieee80211_rts *)(skb->data));
92
93 retval = rt2x00queue_write_tx_frame(queue, skb, true);
94 if (retval) {
95 dev_kfree_skb_any(skb);
96 WARNING(rt2x00dev, "Failed to send RTS/CTS frame.\n");
97 }
98
99 return retval;
100}
101
102void rt2x00mac_tx(struct ieee80211_hw *hw, 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 ERROR(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, 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 switch (vif->type) {
216 case NL80211_IFTYPE_AP:
217 /*
218 * We don't support mixed combinations of
219 * sta and ap interfaces.
220 */
221 if (rt2x00dev->intf_sta_count)
222 return -ENOBUFS;
223
224 /*
225 * Check if we exceeded the maximum amount
226 * of supported interfaces.
227 */
228 if (rt2x00dev->intf_ap_count >= rt2x00dev->ops->max_ap_intf)
229 return -ENOBUFS;
230
231 break;
232 case NL80211_IFTYPE_STATION:
233 case NL80211_IFTYPE_ADHOC:
234 case NL80211_IFTYPE_MESH_POINT:
235 case NL80211_IFTYPE_WDS:
236 /*
237 * We don't support mixed combinations of
238 * sta and ap interfaces.
239 */
240 if (rt2x00dev->intf_ap_count)
241 return -ENOBUFS;
242
243 /*
244 * Check if we exceeded the maximum amount
245 * of supported interfaces.
246 */
247 if (rt2x00dev->intf_sta_count >= rt2x00dev->ops->max_sta_intf)
248 return -ENOBUFS;
249
250 break;
251 default:
252 return -EINVAL;
253 }
254
255 /*
256 * Loop through all beacon queues to find a free
257 * entry. Since there are as much beacon entries
258 * as the maximum interfaces, this search shouldn't
259 * fail.
260 */
261 for (i = 0; i < queue->limit; i++) {
262 entry = &queue->entries[i];
263 if (!test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
264 break;
265 }
266
267 if (unlikely(i == queue->limit))
268 return -ENOBUFS;
269
270 /*
271 * We are now absolutely sure the interface can be created,
272 * increase interface count and start initialization.
273 */
274
275 if (vif->type == NL80211_IFTYPE_AP)
276 rt2x00dev->intf_ap_count++;
277 else
278 rt2x00dev->intf_sta_count++;
279
280 mutex_init(&intf->beacon_skb_mutex);
281 intf->beacon = entry;
282
283 /*
284 * The MAC address must be configured after the device
285 * has been initialized. Otherwise the device can reset
286 * the MAC registers.
287 * The BSSID address must only be configured in AP mode,
288 * however we should not send an empty BSSID address for
289 * STA interfaces at this time, since this can cause
290 * invalid behavior in the device.
291 */
292 rt2x00lib_config_intf(rt2x00dev, intf, vif->type,
293 vif->addr, NULL);
294
295 /*
296 * Some filters depend on the current working mode. We can force
297 * an update during the next configure_filter() run by mac80211 by
298 * resetting the current packet_filter state.
299 */
300 rt2x00dev->packet_filter = 0;
301
302 return 0;
303}
304EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
305
306void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
307 struct ieee80211_vif *vif)
308{
309 struct rt2x00_dev *rt2x00dev = hw->priv;
310 struct rt2x00_intf *intf = vif_to_intf(vif);
311
312 /*
313 * Don't allow interfaces to be remove while
314 * either the device has disappeared or when
315 * no interface is present.
316 */
317 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
318 (vif->type == NL80211_IFTYPE_AP && !rt2x00dev->intf_ap_count) ||
319 (vif->type != NL80211_IFTYPE_AP && !rt2x00dev->intf_sta_count))
320 return;
321
322 if (vif->type == NL80211_IFTYPE_AP)
323 rt2x00dev->intf_ap_count--;
324 else
325 rt2x00dev->intf_sta_count--;
326
327 /*
328 * Release beacon entry so it is available for
329 * new interfaces again.
330 */
331 clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);
332
333 /*
334 * Make sure the bssid and mac address registers
335 * are cleared to prevent false ACKing of frames.
336 */
337 rt2x00lib_config_intf(rt2x00dev, intf,
338 NL80211_IFTYPE_UNSPECIFIED, NULL, NULL);
339}
340EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
341
342int rt2x00mac_config(struct ieee80211_hw *hw, u32 changed)
343{
344 struct rt2x00_dev *rt2x00dev = hw->priv;
345 struct ieee80211_conf *conf = &hw->conf;
346
347 /*
348 * mac80211 might be calling this function while we are trying
349 * to remove the device or perhaps suspending it.
350 */
351 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
352 return 0;
353
354 /*
355 * Some configuration parameters (e.g. channel and antenna values) can
356 * only be set when the radio is enabled, but do require the RX to
357 * be off. During this period we should keep link tuning enabled,
358 * if for any reason the link tuner must be reset, this will be
359 * handled by rt2x00lib_config().
360 */
361 rt2x00queue_stop_queue(rt2x00dev->rx);
362
363 /*
364 * When we've just turned on the radio, we want to reprogram
365 * everything to ensure a consistent state
366 */
367 rt2x00lib_config(rt2x00dev, conf, changed);
368
369 /*
370 * After the radio has been enabled we need to configure
371 * the antenna to the default settings. rt2x00lib_config_antenna()
372 * should determine if any action should be taken based on
373 * checking if diversity has been enabled or no antenna changes
374 * have been made since the last configuration change.
375 */
376 rt2x00lib_config_antenna(rt2x00dev, rt2x00dev->default_ant);
377
378 /* Turn RX back on */
379 rt2x00queue_start_queue(rt2x00dev->rx);
380
381 return 0;
382}
383EXPORT_SYMBOL_GPL(rt2x00mac_config);
384
385void rt2x00mac_configure_filter(struct ieee80211_hw *hw,
386 unsigned int changed_flags,
387 unsigned int *total_flags,
388 u64 multicast)
389{
390 struct rt2x00_dev *rt2x00dev = hw->priv;
391
392 /*
393 * Mask off any flags we are going to ignore
394 * from the total_flags field.
395 */
396 *total_flags &=
397 FIF_ALLMULTI |
398 FIF_FCSFAIL |
399 FIF_PLCPFAIL |
400 FIF_CONTROL |
401 FIF_PSPOLL |
402 FIF_OTHER_BSS |
403 FIF_PROMISC_IN_BSS;
404
405 /*
406 * Apply some rules to the filters:
407 * - Some filters imply different filters to be set.
408 * - Some things we can't filter out at all.
409 * - Multicast filter seems to kill broadcast traffic so never use it.
410 */
411 *total_flags |= FIF_ALLMULTI;
412 if (*total_flags & FIF_OTHER_BSS ||
413 *total_flags & FIF_PROMISC_IN_BSS)
414 *total_flags |= FIF_PROMISC_IN_BSS | FIF_OTHER_BSS;
415
416 /*
417 * If the device has a single filter for all control frames,
418 * FIF_CONTROL and FIF_PSPOLL flags imply each other.
419 * And if the device has more than one filter for control frames
420 * of different types, but has no a separate filter for PS Poll frames,
421 * FIF_CONTROL flag implies FIF_PSPOLL.
422 */
423 if (!test_bit(CAPABILITY_CONTROL_FILTERS, &rt2x00dev->cap_flags)) {
424 if (*total_flags & FIF_CONTROL || *total_flags & FIF_PSPOLL)
425 *total_flags |= FIF_CONTROL | FIF_PSPOLL;
426 }
427 if (!test_bit(CAPABILITY_CONTROL_FILTER_PSPOLL, &rt2x00dev->cap_flags)) {
428 if (*total_flags & FIF_CONTROL)
429 *total_flags |= FIF_PSPOLL;
430 }
431
432 /*
433 * Check if there is any work left for us.
434 */
435 if (rt2x00dev->packet_filter == *total_flags)
436 return;
437 rt2x00dev->packet_filter = *total_flags;
438
439 rt2x00dev->ops->lib->config_filter(rt2x00dev, *total_flags);
440}
441EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter);
442
443static void rt2x00mac_set_tim_iter(void *data, u8 *mac,
444 struct ieee80211_vif *vif)
445{
446 struct rt2x00_intf *intf = vif_to_intf(vif);
447
448 if (vif->type != NL80211_IFTYPE_AP &&
449 vif->type != NL80211_IFTYPE_ADHOC &&
450 vif->type != NL80211_IFTYPE_MESH_POINT &&
451 vif->type != NL80211_IFTYPE_WDS)
452 return;
453
454 set_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags);
455}
456
457int rt2x00mac_set_tim(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
458 bool set)
459{
460 struct rt2x00_dev *rt2x00dev = hw->priv;
461
462 if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
463 return 0;
464
465 ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
466 rt2x00mac_set_tim_iter,
467 rt2x00dev);
468
469 /* queue work to upodate the beacon template */
470 ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->intf_work);
471 return 0;
472}
473EXPORT_SYMBOL_GPL(rt2x00mac_set_tim);
474
475#ifdef CONFIG_RT2X00_LIB_CRYPTO
476static void memcpy_tkip(struct rt2x00lib_crypto *crypto, u8 *key, u8 key_len)
477{
478 if (key_len > NL80211_TKIP_DATA_OFFSET_ENCR_KEY)
479 memcpy(crypto->key,
480 &key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY],
481 sizeof(crypto->key));
482
483 if (key_len > NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY)
484 memcpy(crypto->tx_mic,
485 &key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY],
486 sizeof(crypto->tx_mic));
487
488 if (key_len > NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY)
489 memcpy(crypto->rx_mic,
490 &key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY],
491 sizeof(crypto->rx_mic));
492}
493
494int rt2x00mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
495 struct ieee80211_vif *vif, struct ieee80211_sta *sta,
496 struct ieee80211_key_conf *key)
497{
498 struct rt2x00_dev *rt2x00dev = hw->priv;
499 int (*set_key) (struct rt2x00_dev *rt2x00dev,
500 struct rt2x00lib_crypto *crypto,
501 struct ieee80211_key_conf *key);
502 struct rt2x00lib_crypto crypto;
503 static const u8 bcast_addr[ETH_ALEN] =
504 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, };
505 struct rt2x00_sta *sta_priv = NULL;
506
507 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
508 return 0;
509 else if (!test_bit(CAPABILITY_HW_CRYPTO, &rt2x00dev->cap_flags))
510 return -EOPNOTSUPP;
511 else if (key->keylen > 32)
512 return -ENOSPC;
513
514 memset(&crypto, 0, sizeof(crypto));
515
516 crypto.bssidx = rt2x00lib_get_bssidx(rt2x00dev, vif);
517 crypto.cipher = rt2x00crypto_key_to_cipher(key);
518 if (crypto.cipher == CIPHER_NONE)
519 return -EOPNOTSUPP;
520
521 crypto.cmd = cmd;
522
523 if (sta) {
524 crypto.address = sta->addr;
525 sta_priv = sta_to_rt2x00_sta(sta);
526 crypto.wcid = sta_priv->wcid;
527 } else
528 crypto.address = bcast_addr;
529
530 if (crypto.cipher == CIPHER_TKIP)
531 memcpy_tkip(&crypto, &key->key[0], key->keylen);
532 else
533 memcpy(crypto.key, &key->key[0], key->keylen);
534 /*
535 * Each BSS has a maximum of 4 shared keys.
536 * Shared key index values:
537 * 0) BSS0 key0
538 * 1) BSS0 key1
539 * ...
540 * 4) BSS1 key0
541 * ...
542 * 8) BSS2 key0
543 * ...
544 * Both pairwise as shared key indeces are determined by
545 * driver. This is required because the hardware requires
546 * keys to be assigned in correct order (When key 1 is
547 * provided but key 0 is not, then the key is not found
548 * by the hardware during RX).
549 */
550 if (cmd == SET_KEY)
551 key->hw_key_idx = 0;
552
553 if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
554 set_key = rt2x00dev->ops->lib->config_pairwise_key;
555 else
556 set_key = rt2x00dev->ops->lib->config_shared_key;
557
558 if (!set_key)
559 return -EOPNOTSUPP;
560
561 return set_key(rt2x00dev, &crypto, key);
562}
563EXPORT_SYMBOL_GPL(rt2x00mac_set_key);
564#endif /* CONFIG_RT2X00_LIB_CRYPTO */
565
566int rt2x00mac_sta_add(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
567 struct ieee80211_sta *sta)
568{
569 struct rt2x00_dev *rt2x00dev = hw->priv;
570 struct rt2x00_sta *sta_priv = sta_to_rt2x00_sta(sta);
571
572 /*
573 * If there's no space left in the device table store
574 * -1 as wcid but tell mac80211 everything went ok.
575 */
576 if (rt2x00dev->ops->lib->sta_add(rt2x00dev, vif, sta))
577 sta_priv->wcid = -1;
578
579 return 0;
580}
581EXPORT_SYMBOL_GPL(rt2x00mac_sta_add);
582
583int rt2x00mac_sta_remove(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
584 struct ieee80211_sta *sta)
585{
586 struct rt2x00_dev *rt2x00dev = hw->priv;
587 struct rt2x00_sta *sta_priv = sta_to_rt2x00_sta(sta);
588
589 /*
590 * If we never sent the STA to the device no need to clean it up.
591 */
592 if (sta_priv->wcid < 0)
593 return 0;
594
595 return rt2x00dev->ops->lib->sta_remove(rt2x00dev, sta_priv->wcid);
596}
597EXPORT_SYMBOL_GPL(rt2x00mac_sta_remove);
598
599void rt2x00mac_sw_scan_start(struct ieee80211_hw *hw)
600{
601 struct rt2x00_dev *rt2x00dev = hw->priv;
602 set_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
603 rt2x00link_stop_tuner(rt2x00dev);
604}
605EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_start);
606
607void rt2x00mac_sw_scan_complete(struct ieee80211_hw *hw)
608{
609 struct rt2x00_dev *rt2x00dev = hw->priv;
610 clear_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
611 rt2x00link_start_tuner(rt2x00dev);
612}
613EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_complete);
614
615int rt2x00mac_get_stats(struct ieee80211_hw *hw,
616 struct ieee80211_low_level_stats *stats)
617{
618 struct rt2x00_dev *rt2x00dev = hw->priv;
619
620 /*
621 * The dot11ACKFailureCount, dot11RTSFailureCount and
622 * dot11RTSSuccessCount are updated in interrupt time.
623 * dot11FCSErrorCount is updated in the link tuner.
624 */
625 memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
626
627 return 0;
628}
629EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
630
631void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
632 struct ieee80211_vif *vif,
633 struct ieee80211_bss_conf *bss_conf,
634 u32 changes)
635{
636 struct rt2x00_dev *rt2x00dev = hw->priv;
637 struct rt2x00_intf *intf = vif_to_intf(vif);
638
639 /*
640 * mac80211 might be calling this function while we are trying
641 * to remove the device or perhaps suspending it.
642 */
643 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
644 return;
645
646 /*
647 * Update the BSSID.
648 */
649 if (changes & BSS_CHANGED_BSSID)
650 rt2x00lib_config_intf(rt2x00dev, intf, vif->type, NULL,
651 bss_conf->bssid);
652
653 /*
654 * Update the beacon. This is only required on USB devices. PCI
655 * devices fetch beacons periodically.
656 */
657 if (changes & BSS_CHANGED_BEACON && rt2x00_is_usb(rt2x00dev))
658 rt2x00queue_update_beacon(rt2x00dev, vif);
659
660 /*
661 * Start/stop beaconing.
662 */
663 if (changes & BSS_CHANGED_BEACON_ENABLED) {
664 if (!bss_conf->enable_beacon && intf->enable_beacon) {
665 rt2x00queue_clear_beacon(rt2x00dev, vif);
666 rt2x00dev->intf_beaconing--;
667 intf->enable_beacon = false;
668
669 if (rt2x00dev->intf_beaconing == 0) {
670 /*
671 * Last beaconing interface disabled
672 * -> stop beacon queue.
673 */
674 mutex_lock(&intf->beacon_skb_mutex);
675 rt2x00queue_stop_queue(rt2x00dev->bcn);
676 mutex_unlock(&intf->beacon_skb_mutex);
677 }
678
679
680 } else if (bss_conf->enable_beacon && !intf->enable_beacon) {
681 rt2x00dev->intf_beaconing++;
682 intf->enable_beacon = true;
683
684 if (rt2x00dev->intf_beaconing == 1) {
685 /*
686 * First beaconing interface enabled
687 * -> start beacon queue.
688 */
689 mutex_lock(&intf->beacon_skb_mutex);
690 rt2x00queue_start_queue(rt2x00dev->bcn);
691 mutex_unlock(&intf->beacon_skb_mutex);
692 }
693 }
694 }
695
696 /*
697 * When the association status has changed we must reset the link
698 * tuner counter. This is because some drivers determine if they
699 * should perform link tuning based on the number of seconds
700 * while associated or not associated.
701 */
702 if (changes & BSS_CHANGED_ASSOC) {
703 rt2x00dev->link.count = 0;
704
705 if (bss_conf->assoc)
706 rt2x00dev->intf_associated++;
707 else
708 rt2x00dev->intf_associated--;
709
710 rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
711
712 clear_bit(CONFIG_QOS_DISABLED, &rt2x00dev->flags);
713 }
714
715 /*
716 * Check for access point which do not support 802.11e . We have to
717 * generate data frames sequence number in S/W for such AP, because
718 * of H/W bug.
719 */
720 if (changes & BSS_CHANGED_QOS && !bss_conf->qos)
721 set_bit(CONFIG_QOS_DISABLED, &rt2x00dev->flags);
722
723 /*
724 * When the erp information has changed, we should perform
725 * additional configuration steps. For all other changes we are done.
726 */
727 if (changes & (BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE |
728 BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BASIC_RATES |
729 BSS_CHANGED_BEACON_INT | BSS_CHANGED_HT))
730 rt2x00lib_config_erp(rt2x00dev, intf, bss_conf, changes);
731}
732EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
733
734int rt2x00mac_conf_tx(struct ieee80211_hw *hw,
735 struct ieee80211_vif *vif, u16 queue_idx,
736 const struct ieee80211_tx_queue_params *params)
737{
738 struct rt2x00_dev *rt2x00dev = hw->priv;
739 struct data_queue *queue;
740
741 queue = rt2x00queue_get_tx_queue(rt2x00dev, queue_idx);
742 if (unlikely(!queue))
743 return -EINVAL;
744
745 /*
746 * The passed variables are stored as real value ((2^n)-1).
747 * Ralink registers require to know the bit number 'n'.
748 */
749 if (params->cw_min > 0)
750 queue->cw_min = fls(params->cw_min);
751 else
752 queue->cw_min = 5; /* cw_min: 2^5 = 32. */
753
754 if (params->cw_max > 0)
755 queue->cw_max = fls(params->cw_max);
756 else
757 queue->cw_max = 10; /* cw_min: 2^10 = 1024. */
758
759 queue->aifs = params->aifs;
760 queue->txop = params->txop;
761
762 INFO(rt2x00dev,
763 "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d, TXop: %d.\n",
764 queue_idx, queue->cw_min, queue->cw_max, queue->aifs, queue->txop);
765
766 return 0;
767}
768EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);
769
770void rt2x00mac_rfkill_poll(struct ieee80211_hw *hw)
771{
772 struct rt2x00_dev *rt2x00dev = hw->priv;
773 bool active = !!rt2x00dev->ops->lib->rfkill_poll(rt2x00dev);
774
775 wiphy_rfkill_set_hw_state(hw->wiphy, !active);
776}
777EXPORT_SYMBOL_GPL(rt2x00mac_rfkill_poll);
778
779void rt2x00mac_flush(struct ieee80211_hw *hw, bool drop)
780{
781 struct rt2x00_dev *rt2x00dev = hw->priv;
782 struct data_queue *queue;
783
784 tx_queue_for_each(rt2x00dev, queue)
785 rt2x00queue_flush_queue(queue, drop);
786}
787EXPORT_SYMBOL_GPL(rt2x00mac_flush);
788
789int rt2x00mac_set_antenna(struct ieee80211_hw *hw, u32 tx_ant, u32 rx_ant)
790{
791 struct rt2x00_dev *rt2x00dev = hw->priv;
792 struct link_ant *ant = &rt2x00dev->link.ant;
793 struct antenna_setup *def = &rt2x00dev->default_ant;
794 struct antenna_setup setup;
795
796 // The antenna value is not supposed to be 0,
797 // or exceed the maximum number of antenna's.
798 if (!tx_ant || (tx_ant & ~3) || !rx_ant || (rx_ant & ~3))
799 return -EINVAL;
800
801 // When the client tried to configure the antenna to or from
802 // diversity mode, we must reset the default antenna as well
803 // as that controls the diversity switch.
804 if (ant->flags & ANTENNA_TX_DIVERSITY && tx_ant != 3)
805 ant->flags &= ~ANTENNA_TX_DIVERSITY;
806 if (ant->flags & ANTENNA_RX_DIVERSITY && rx_ant != 3)
807 ant->flags &= ~ANTENNA_RX_DIVERSITY;
808
809 // If diversity is being enabled, check if we need hardware
810 // or software diversity. In the latter case, reset the value,
811 // and make sure we update the antenna flags to have the
812 // link tuner pick up the diversity tuning.
813 if (tx_ant == 3 && def->tx == ANTENNA_SW_DIVERSITY) {
814 tx_ant = ANTENNA_SW_DIVERSITY;
815 ant->flags |= ANTENNA_TX_DIVERSITY;
816 }
817
818 if (rx_ant == 3 && def->rx == ANTENNA_SW_DIVERSITY) {
819 rx_ant = ANTENNA_SW_DIVERSITY;
820 ant->flags |= ANTENNA_RX_DIVERSITY;
821 }
822
823 setup.tx = tx_ant;
824 setup.rx = rx_ant;
825
826 rt2x00lib_config_antenna(rt2x00dev, setup);
827
828 return 0;
829}
830EXPORT_SYMBOL_GPL(rt2x00mac_set_antenna);
831
832int rt2x00mac_get_antenna(struct ieee80211_hw *hw, u32 *tx_ant, u32 *rx_ant)
833{
834 struct rt2x00_dev *rt2x00dev = hw->priv;
835 struct link_ant *ant = &rt2x00dev->link.ant;
836 struct antenna_setup *active = &rt2x00dev->link.ant.active;
837
838 // When software diversity is active, we must report this to the
839 // client and not the current active antenna state.
840 if (ant->flags & ANTENNA_TX_DIVERSITY)
841 *tx_ant = ANTENNA_HW_DIVERSITY;
842 else
843 *tx_ant = active->tx;
844
845 if (ant->flags & ANTENNA_RX_DIVERSITY)
846 *rx_ant = ANTENNA_HW_DIVERSITY;
847 else
848 *rx_ant = active->rx;
849
850 return 0;
851}
852EXPORT_SYMBOL_GPL(rt2x00mac_get_antenna);
853
854void rt2x00mac_get_ringparam(struct ieee80211_hw *hw,
855 u32 *tx, u32 *tx_max, u32 *rx, u32 *rx_max)
856{
857 struct rt2x00_dev *rt2x00dev = hw->priv;
858 struct data_queue *queue;
859
860 tx_queue_for_each(rt2x00dev, queue) {
861 *tx += queue->length;
862 *tx_max += queue->limit;
863 }
864
865 *rx = rt2x00dev->rx->length;
866 *rx_max = rt2x00dev->rx->limit;
867}
868EXPORT_SYMBOL_GPL(rt2x00mac_get_ringparam);
869
870bool rt2x00mac_tx_frames_pending(struct ieee80211_hw *hw)
871{
872 struct rt2x00_dev *rt2x00dev = hw->priv;
873 struct data_queue *queue;
874
875 tx_queue_for_each(rt2x00dev, queue) {
876 if (!rt2x00queue_empty(queue))
877 return true;
878 }
879
880 return false;
881}
882EXPORT_SYMBOL_GPL(rt2x00mac_tx_frames_pending);