2 Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
3 <http://rt2x00.serialmonkey.com>
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.
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.
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.
23 Abstract: rt2x00 generic mac80211 routines.
26 #include <linux/kernel.h>
27 #include <linux/module.h>
30 #include "rt2x00lib.h"
32 static int rt2x00mac_tx_rts_cts(struct rt2x00_dev *rt2x00dev,
33 struct data_queue *queue,
34 struct sk_buff *frag_skb)
36 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(frag_skb);
37 struct ieee80211_tx_info *rts_info;
39 unsigned int data_length;
42 if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
43 data_length = sizeof(struct ieee80211_cts);
45 data_length = sizeof(struct ieee80211_rts);
47 skb = dev_alloc_skb(data_length + rt2x00dev->hw->extra_tx_headroom);
49 WARNING(rt2x00dev, "Failed to create RTS/CTS frame.\n");
53 skb_reserve(skb, rt2x00dev->hw->extra_tx_headroom);
54 skb_put(skb, data_length);
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.
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;
70 if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
71 rts_info->flags |= IEEE80211_TX_CTL_NO_ACK;
73 rts_info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
75 /* Disable hardware encryption */
76 rts_info->control.hw_key = NULL;
79 * RTS/CTS frame should use the length of the frame plus any
80 * encryption overhead that will be added by the hardware.
82 data_length += rt2x00crypto_tx_overhead(rt2x00dev, skb);
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));
89 ieee80211_rts_get(rt2x00dev->hw, tx_info->control.vif,
90 frag_skb->data, data_length, tx_info,
91 (struct ieee80211_rts *)(skb->data));
93 retval = rt2x00queue_write_tx_frame(queue, skb, true);
95 dev_kfree_skb_any(skb);
96 WARNING(rt2x00dev, "Failed to send RTS/CTS frame.\n");
102 int rt2x00mac_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
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;
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.
115 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
119 * Determine which queue to put packet on.
121 if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM &&
122 test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags))
123 queue = rt2x00queue_get_queue(rt2x00dev, QID_ATIM);
125 queue = rt2x00queue_get_queue(rt2x00dev, qid);
126 if (unlikely(!queue)) {
128 "Attempt to send packet over invalid queue %d.\n"
129 "Please file bug report to %s.\n", qid, DRV_PROJECT);
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.
142 if ((tx_info->control.rates[0].flags & (IEEE80211_TX_RC_USE_RTS_CTS |
143 IEEE80211_TX_RC_USE_CTS_PROTECT)) &&
144 !rt2x00dev->ops->hw->set_rts_threshold) {
145 if (rt2x00queue_available(queue) <= 1)
148 if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb))
152 if (rt2x00queue_write_tx_frame(queue, skb, false))
155 if (rt2x00queue_threshold(queue))
156 rt2x00queue_pause_queue(queue);
161 ieee80211_stop_queue(rt2x00dev->hw, qid);
162 dev_kfree_skb_any(skb);
165 EXPORT_SYMBOL_GPL(rt2x00mac_tx);
167 int rt2x00mac_start(struct ieee80211_hw *hw)
169 struct rt2x00_dev *rt2x00dev = hw->priv;
171 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
174 return rt2x00lib_start(rt2x00dev);
176 EXPORT_SYMBOL_GPL(rt2x00mac_start);
178 void rt2x00mac_stop(struct ieee80211_hw *hw)
180 struct rt2x00_dev *rt2x00dev = hw->priv;
182 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
185 rt2x00lib_stop(rt2x00dev);
187 EXPORT_SYMBOL_GPL(rt2x00mac_stop);
189 int rt2x00mac_add_interface(struct ieee80211_hw *hw,
190 struct ieee80211_vif *vif)
192 struct rt2x00_dev *rt2x00dev = hw->priv;
193 struct rt2x00_intf *intf = vif_to_intf(vif);
194 struct data_queue *queue = rt2x00queue_get_queue(rt2x00dev, QID_BEACON);
195 struct queue_entry *entry = NULL;
199 * Don't allow interfaces to be added
200 * the device has disappeared.
202 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
203 !test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
207 case NL80211_IFTYPE_AP:
209 * We don't support mixed combinations of
210 * sta and ap interfaces.
212 if (rt2x00dev->intf_sta_count)
216 * Check if we exceeded the maximum amount
217 * of supported interfaces.
219 if (rt2x00dev->intf_ap_count >= rt2x00dev->ops->max_ap_intf)
223 case NL80211_IFTYPE_STATION:
224 case NL80211_IFTYPE_ADHOC:
225 case NL80211_IFTYPE_MESH_POINT:
226 case NL80211_IFTYPE_WDS:
228 * We don't support mixed combinations of
229 * sta and ap interfaces.
231 if (rt2x00dev->intf_ap_count)
235 * Check if we exceeded the maximum amount
236 * of supported interfaces.
238 if (rt2x00dev->intf_sta_count >= rt2x00dev->ops->max_sta_intf)
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
252 for (i = 0; i < queue->limit; i++) {
253 entry = &queue->entries[i];
254 if (!test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
258 if (unlikely(i == queue->limit))
262 * We are now absolutely sure the interface can be created,
263 * increase interface count and start initialization.
266 if (vif->type == NL80211_IFTYPE_AP)
267 rt2x00dev->intf_ap_count++;
269 rt2x00dev->intf_sta_count++;
271 spin_lock_init(&intf->lock);
272 spin_lock_init(&intf->seqlock);
273 mutex_init(&intf->beacon_skb_mutex);
274 intf->beacon = entry;
277 * The MAC adddress must be configured after the device
278 * has been initialized. Otherwise the device can reset
280 * The BSSID address must only be configured in AP mode,
281 * however we should not send an empty BSSID address for
282 * STA interfaces at this time, since this can cause
283 * invalid behavior in the device.
285 rt2x00lib_config_intf(rt2x00dev, intf, vif->type,
289 * Some filters depend on the current working mode. We can force
290 * an update during the next configure_filter() run by mac80211 by
291 * resetting the current packet_filter state.
293 rt2x00dev->packet_filter = 0;
297 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
299 void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
300 struct ieee80211_vif *vif)
302 struct rt2x00_dev *rt2x00dev = hw->priv;
303 struct rt2x00_intf *intf = vif_to_intf(vif);
306 * Don't allow interfaces to be remove while
307 * either the device has disappeared or when
308 * no interface is present.
310 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
311 (vif->type == NL80211_IFTYPE_AP && !rt2x00dev->intf_ap_count) ||
312 (vif->type != NL80211_IFTYPE_AP && !rt2x00dev->intf_sta_count))
315 if (vif->type == NL80211_IFTYPE_AP)
316 rt2x00dev->intf_ap_count--;
318 rt2x00dev->intf_sta_count--;
321 * Release beacon entry so it is available for
322 * new interfaces again.
324 clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);
327 * Make sure the bssid and mac address registers
328 * are cleared to prevent false ACKing of frames.
330 rt2x00lib_config_intf(rt2x00dev, intf,
331 NL80211_IFTYPE_UNSPECIFIED, NULL, NULL);
333 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
335 int rt2x00mac_config(struct ieee80211_hw *hw, u32 changed)
337 struct rt2x00_dev *rt2x00dev = hw->priv;
338 struct ieee80211_conf *conf = &hw->conf;
341 * mac80211 might be calling this function while we are trying
342 * to remove the device or perhaps suspending it.
344 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
348 * Some configuration parameters (e.g. channel and antenna values) can
349 * only be set when the radio is enabled, but do require the RX to
350 * be off. During this period we should keep link tuning enabled,
351 * if for any reason the link tuner must be reset, this will be
352 * handled by rt2x00lib_config().
354 rt2x00queue_stop_queue(rt2x00dev->rx);
357 * When we've just turned on the radio, we want to reprogram
358 * everything to ensure a consistent state
360 rt2x00lib_config(rt2x00dev, conf, changed);
363 * After the radio has been enabled we need to configure
364 * the antenna to the default settings. rt2x00lib_config_antenna()
365 * should determine if any action should be taken based on
366 * checking if diversity has been enabled or no antenna changes
367 * have been made since the last configuration change.
369 rt2x00lib_config_antenna(rt2x00dev, rt2x00dev->default_ant);
371 /* Turn RX back on */
372 rt2x00queue_start_queue(rt2x00dev->rx);
376 EXPORT_SYMBOL_GPL(rt2x00mac_config);
378 void rt2x00mac_configure_filter(struct ieee80211_hw *hw,
379 unsigned int changed_flags,
380 unsigned int *total_flags,
383 struct rt2x00_dev *rt2x00dev = hw->priv;
386 * Mask off any flags we are going to ignore
387 * from the total_flags field.
399 * Apply some rules to the filters:
400 * - Some filters imply different filters to be set.
401 * - Some things we can't filter out at all.
402 * - Multicast filter seems to kill broadcast traffic so never use it.
404 *total_flags |= FIF_ALLMULTI;
405 if (*total_flags & FIF_OTHER_BSS ||
406 *total_flags & FIF_PROMISC_IN_BSS)
407 *total_flags |= FIF_PROMISC_IN_BSS | FIF_OTHER_BSS;
410 * If the device has a single filter for all control frames,
411 * FIF_CONTROL and FIF_PSPOLL flags imply each other.
412 * And if the device has more than one filter for control frames
413 * of different types, but has no a separate filter for PS Poll frames,
414 * FIF_CONTROL flag implies FIF_PSPOLL.
416 if (!test_bit(DRIVER_SUPPORT_CONTROL_FILTERS, &rt2x00dev->flags)) {
417 if (*total_flags & FIF_CONTROL || *total_flags & FIF_PSPOLL)
418 *total_flags |= FIF_CONTROL | FIF_PSPOLL;
420 if (!test_bit(DRIVER_SUPPORT_CONTROL_FILTER_PSPOLL, &rt2x00dev->flags)) {
421 if (*total_flags & FIF_CONTROL)
422 *total_flags |= FIF_PSPOLL;
426 * Check if there is any work left for us.
428 if (rt2x00dev->packet_filter == *total_flags)
430 rt2x00dev->packet_filter = *total_flags;
432 rt2x00dev->ops->lib->config_filter(rt2x00dev, *total_flags);
434 EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter);
436 static void rt2x00mac_set_tim_iter(void *data, u8 *mac,
437 struct ieee80211_vif *vif)
439 struct rt2x00_intf *intf = vif_to_intf(vif);
441 if (vif->type != NL80211_IFTYPE_AP &&
442 vif->type != NL80211_IFTYPE_ADHOC &&
443 vif->type != NL80211_IFTYPE_MESH_POINT &&
444 vif->type != NL80211_IFTYPE_WDS)
447 set_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags);
450 int rt2x00mac_set_tim(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
453 struct rt2x00_dev *rt2x00dev = hw->priv;
455 if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
458 ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
459 rt2x00mac_set_tim_iter,
462 /* queue work to upodate the beacon template */
463 ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->intf_work);
466 EXPORT_SYMBOL_GPL(rt2x00mac_set_tim);
468 #ifdef CONFIG_RT2X00_LIB_CRYPTO
469 static void memcpy_tkip(struct rt2x00lib_crypto *crypto, u8 *key, u8 key_len)
471 if (key_len > NL80211_TKIP_DATA_OFFSET_ENCR_KEY)
473 &key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY],
474 sizeof(crypto->key));
476 if (key_len > NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY)
477 memcpy(crypto->tx_mic,
478 &key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY],
479 sizeof(crypto->tx_mic));
481 if (key_len > NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY)
482 memcpy(crypto->rx_mic,
483 &key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY],
484 sizeof(crypto->rx_mic));
487 int rt2x00mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
488 struct ieee80211_vif *vif, struct ieee80211_sta *sta,
489 struct ieee80211_key_conf *key)
491 struct rt2x00_dev *rt2x00dev = hw->priv;
492 int (*set_key) (struct rt2x00_dev *rt2x00dev,
493 struct rt2x00lib_crypto *crypto,
494 struct ieee80211_key_conf *key);
495 struct rt2x00lib_crypto crypto;
496 static const u8 bcast_addr[ETH_ALEN] =
497 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, };
499 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
501 else if (!test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags))
503 else if (key->keylen > 32)
506 memset(&crypto, 0, sizeof(crypto));
509 * When in STA mode, bssidx is always 0 otherwise local_address[5]
510 * contains the bss number, see BSS_ID_MASK comments for details.
512 if (rt2x00dev->intf_sta_count)
515 crypto.bssidx = vif->addr[5] & (rt2x00dev->ops->max_ap_intf - 1);
517 crypto.cipher = rt2x00crypto_key_to_cipher(key);
518 if (crypto.cipher == CIPHER_NONE)
524 /* some drivers need the AID */
525 crypto.aid = sta->aid;
526 crypto.address = sta->addr;
528 crypto.address = bcast_addr;
530 if (crypto.cipher == CIPHER_TKIP)
531 memcpy_tkip(&crypto, &key->key[0], key->keylen);
533 memcpy(crypto.key, &key->key[0], key->keylen);
535 * Each BSS has a maximum of 4 shared keys.
536 * Shared key index values:
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).
553 if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
554 set_key = rt2x00dev->ops->lib->config_pairwise_key;
556 set_key = rt2x00dev->ops->lib->config_shared_key;
561 return set_key(rt2x00dev, &crypto, key);
563 EXPORT_SYMBOL_GPL(rt2x00mac_set_key);
564 #endif /* CONFIG_RT2X00_LIB_CRYPTO */
566 void rt2x00mac_sw_scan_start(struct ieee80211_hw *hw)
568 struct rt2x00_dev *rt2x00dev = hw->priv;
569 __set_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
570 rt2x00link_stop_tuner(rt2x00dev);
572 EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_start);
574 void rt2x00mac_sw_scan_complete(struct ieee80211_hw *hw)
576 struct rt2x00_dev *rt2x00dev = hw->priv;
577 __clear_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
578 rt2x00link_start_tuner(rt2x00dev);
580 EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_complete);
582 int rt2x00mac_get_stats(struct ieee80211_hw *hw,
583 struct ieee80211_low_level_stats *stats)
585 struct rt2x00_dev *rt2x00dev = hw->priv;
588 * The dot11ACKFailureCount, dot11RTSFailureCount and
589 * dot11RTSSuccessCount are updated in interrupt time.
590 * dot11FCSErrorCount is updated in the link tuner.
592 memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
596 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
598 void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
599 struct ieee80211_vif *vif,
600 struct ieee80211_bss_conf *bss_conf,
603 struct rt2x00_dev *rt2x00dev = hw->priv;
604 struct rt2x00_intf *intf = vif_to_intf(vif);
607 * mac80211 might be calling this function while we are trying
608 * to remove the device or perhaps suspending it.
610 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
614 * Call rt2x00_config_intf() outside of the spinlock context since
615 * the call will sleep for USB drivers. By using the ieee80211_if_conf
616 * values as arguments we make keep access to rt2x00_intf thread safe
617 * even without the lock.
619 if (changes & BSS_CHANGED_BSSID)
620 rt2x00lib_config_intf(rt2x00dev, intf, vif->type, NULL,
626 if (changes & (BSS_CHANGED_BEACON | BSS_CHANGED_BEACON_ENABLED))
627 rt2x00queue_update_beacon(rt2x00dev, vif,
628 bss_conf->enable_beacon);
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.
636 if (changes & BSS_CHANGED_ASSOC) {
637 rt2x00dev->link.count = 0;
640 rt2x00dev->intf_associated++;
642 rt2x00dev->intf_associated--;
644 rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
648 * When the erp information has changed, we should perform
649 * additional configuration steps. For all other changes we are done.
651 if (changes & (BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE |
652 BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BASIC_RATES |
653 BSS_CHANGED_BEACON_INT | BSS_CHANGED_HT))
654 rt2x00lib_config_erp(rt2x00dev, intf, bss_conf, changes);
656 EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
658 int rt2x00mac_conf_tx(struct ieee80211_hw *hw, u16 queue_idx,
659 const struct ieee80211_tx_queue_params *params)
661 struct rt2x00_dev *rt2x00dev = hw->priv;
662 struct data_queue *queue;
664 queue = rt2x00queue_get_queue(rt2x00dev, queue_idx);
665 if (unlikely(!queue))
669 * The passed variables are stored as real value ((2^n)-1).
670 * Ralink registers require to know the bit number 'n'.
672 if (params->cw_min > 0)
673 queue->cw_min = fls(params->cw_min);
675 queue->cw_min = 5; /* cw_min: 2^5 = 32. */
677 if (params->cw_max > 0)
678 queue->cw_max = fls(params->cw_max);
680 queue->cw_max = 10; /* cw_min: 2^10 = 1024. */
682 queue->aifs = params->aifs;
683 queue->txop = params->txop;
686 "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d, TXop: %d.\n",
687 queue_idx, queue->cw_min, queue->cw_max, queue->aifs, queue->txop);
691 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);
693 void rt2x00mac_rfkill_poll(struct ieee80211_hw *hw)
695 struct rt2x00_dev *rt2x00dev = hw->priv;
696 bool active = !!rt2x00dev->ops->lib->rfkill_poll(rt2x00dev);
698 wiphy_rfkill_set_hw_state(hw->wiphy, !active);
700 EXPORT_SYMBOL_GPL(rt2x00mac_rfkill_poll);
702 void rt2x00mac_flush(struct ieee80211_hw *hw, bool drop)
704 struct rt2x00_dev *rt2x00dev = hw->priv;
705 struct data_queue *queue;
707 tx_queue_for_each(rt2x00dev, queue)
708 rt2x00queue_flush_queue(queue, drop);
710 EXPORT_SYMBOL_GPL(rt2x00mac_flush);