2 Copyright (C) 2004 - 2009 rt2x00 SourceForge Project
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;
69 rts_info->flags &= ~IEEE80211_TX_CTL_REQ_TX_STATUS;
71 if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
72 rts_info->flags |= IEEE80211_TX_CTL_NO_ACK;
74 rts_info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
76 skb->do_not_encrypt = 1;
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);
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 struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data;
107 enum data_queue_qid qid = skb_get_queue_mapping(skb);
108 struct data_queue *queue;
112 * Mac80211 might be calling this function while we are trying
113 * to remove the device or perhaps suspending it.
114 * Note that we can only stop the TX queues inside the TX path
115 * due to possible race conditions in mac80211.
117 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
121 * Determine which queue to put packet on.
123 if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM &&
124 test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags))
125 queue = rt2x00queue_get_queue(rt2x00dev, QID_ATIM);
127 queue = rt2x00queue_get_queue(rt2x00dev, qid);
128 if (unlikely(!queue)) {
130 "Attempt to send packet over invalid queue %d.\n"
131 "Please file bug report to %s.\n", qid, DRV_PROJECT);
136 * If CTS/RTS is required. create and queue that frame first.
137 * Make sure we have at least enough entries available to send
138 * this CTS/RTS frame as well as the data frame.
139 * Note that when the driver has set the set_rts_threshold()
140 * callback function it doesn't need software generation of
141 * either RTS or CTS-to-self frame and handles everything
142 * inside the hardware.
144 frame_control = le16_to_cpu(ieee80211hdr->frame_control);
145 if ((tx_info->control.rates[0].flags & (IEEE80211_TX_RC_USE_RTS_CTS |
146 IEEE80211_TX_RC_USE_CTS_PROTECT)) &&
147 !rt2x00dev->ops->hw->set_rts_threshold) {
148 if (rt2x00queue_available(queue) <= 1)
151 if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb))
155 if (rt2x00queue_write_tx_frame(queue, skb))
158 if (rt2x00queue_threshold(queue))
159 ieee80211_stop_queue(rt2x00dev->hw, qid);
164 ieee80211_stop_queue(rt2x00dev->hw, qid);
165 dev_kfree_skb_any(skb);
168 EXPORT_SYMBOL_GPL(rt2x00mac_tx);
170 int rt2x00mac_start(struct ieee80211_hw *hw)
172 struct rt2x00_dev *rt2x00dev = hw->priv;
174 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
177 return rt2x00lib_start(rt2x00dev);
179 EXPORT_SYMBOL_GPL(rt2x00mac_start);
181 void rt2x00mac_stop(struct ieee80211_hw *hw)
183 struct rt2x00_dev *rt2x00dev = hw->priv;
185 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
188 rt2x00lib_stop(rt2x00dev);
190 EXPORT_SYMBOL_GPL(rt2x00mac_stop);
192 int rt2x00mac_add_interface(struct ieee80211_hw *hw,
193 struct ieee80211_if_init_conf *conf)
195 struct rt2x00_dev *rt2x00dev = hw->priv;
196 struct rt2x00_intf *intf = vif_to_intf(conf->vif);
197 struct data_queue *queue = rt2x00queue_get_queue(rt2x00dev, QID_BEACON);
198 struct queue_entry *entry = NULL;
202 * Don't allow interfaces to be added
203 * the device has disappeared.
205 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
206 !test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
209 switch (conf->type) {
210 case NL80211_IFTYPE_AP:
212 * We don't support mixed combinations of
213 * sta and ap interfaces.
215 if (rt2x00dev->intf_sta_count)
219 * Check if we exceeded the maximum amount
220 * of supported interfaces.
222 if (rt2x00dev->intf_ap_count >= rt2x00dev->ops->max_ap_intf)
226 case NL80211_IFTYPE_STATION:
227 case NL80211_IFTYPE_ADHOC:
228 case NL80211_IFTYPE_MESH_POINT:
229 case NL80211_IFTYPE_WDS:
231 * We don't support mixed combinations of
232 * sta and ap interfaces.
234 if (rt2x00dev->intf_ap_count)
238 * Check if we exceeded the maximum amount
239 * of supported interfaces.
241 if (rt2x00dev->intf_sta_count >= rt2x00dev->ops->max_sta_intf)
250 * Loop through all beacon queues to find a free
251 * entry. Since there are as much beacon entries
252 * as the maximum interfaces, this search shouldn't
255 for (i = 0; i < queue->limit; i++) {
256 entry = &queue->entries[i];
257 if (!test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
261 if (unlikely(i == queue->limit))
265 * We are now absolutely sure the interface can be created,
266 * increase interface count and start initialization.
269 if (conf->type == NL80211_IFTYPE_AP)
270 rt2x00dev->intf_ap_count++;
272 rt2x00dev->intf_sta_count++;
274 spin_lock_init(&intf->lock);
275 spin_lock_init(&intf->seqlock);
276 intf->beacon = entry;
278 if (conf->type == NL80211_IFTYPE_AP)
279 memcpy(&intf->bssid, conf->mac_addr, ETH_ALEN);
280 memcpy(&intf->mac, conf->mac_addr, ETH_ALEN);
283 * The MAC adddress must be configured after the device
284 * has been initialized. Otherwise the device can reset
287 rt2x00lib_config_intf(rt2x00dev, intf, conf->type, intf->mac, NULL);
290 * Some filters depend on the current working mode. We can force
291 * an update during the next configure_filter() run by mac80211 by
292 * resetting the current packet_filter state.
294 rt2x00dev->packet_filter = 0;
298 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
300 void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
301 struct ieee80211_if_init_conf *conf)
303 struct rt2x00_dev *rt2x00dev = hw->priv;
304 struct rt2x00_intf *intf = vif_to_intf(conf->vif);
307 * Don't allow interfaces to be remove while
308 * either the device has disappeared or when
309 * no interface is present.
311 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
312 (conf->type == NL80211_IFTYPE_AP && !rt2x00dev->intf_ap_count) ||
313 (conf->type != NL80211_IFTYPE_AP && !rt2x00dev->intf_sta_count))
316 if (conf->type == NL80211_IFTYPE_AP)
317 rt2x00dev->intf_ap_count--;
319 rt2x00dev->intf_sta_count--;
322 * Release beacon entry so it is available for
323 * new interfaces again.
325 clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);
328 * Make sure the bssid and mac address registers
329 * are cleared to prevent false ACKing of frames.
331 rt2x00lib_config_intf(rt2x00dev, intf,
332 NL80211_IFTYPE_UNSPECIFIED, NULL, NULL);
334 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
336 int rt2x00mac_config(struct ieee80211_hw *hw, u32 changed)
338 struct rt2x00_dev *rt2x00dev = hw->priv;
339 struct ieee80211_conf *conf = &hw->conf;
343 * Mac80211 might be calling this function while we are trying
344 * to remove the device or perhaps suspending it.
346 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
350 * Only change device state when the radio is enabled. It does not
351 * matter what parameters we have configured when the radio is disabled
352 * because we won't be able to send or receive anyway. Also note that
353 * some configuration parameters (e.g. channel and antenna values) can
354 * only be set when the radio is enabled.
356 if (conf->radio_enabled) {
357 /* For programming the values, we have to turn RX off */
358 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
360 /* Enable the radio */
361 status = rt2x00lib_enable_radio(rt2x00dev);
362 if (unlikely(status))
366 * When we've just turned on the radio, we want to reprogram
367 * everything to ensure a consistent state
369 rt2x00lib_config(rt2x00dev, conf, changed);
372 * The radio was enabled, configure the antenna to the
373 * default settings, the link tuner will later start
374 * continue configuring the antenna based on the software
375 * diversity. But for non-diversity configurations, we need
376 * to have configured the correct state now.
378 if (changed & IEEE80211_CONF_CHANGE_RADIO_ENABLED)
379 rt2x00lib_config_antenna(rt2x00dev,
380 &rt2x00dev->default_ant);
382 /* Turn RX back on */
383 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
385 /* Disable the radio */
386 rt2x00lib_disable_radio(rt2x00dev);
391 EXPORT_SYMBOL_GPL(rt2x00mac_config);
393 void rt2x00mac_configure_filter(struct ieee80211_hw *hw,
394 unsigned int changed_flags,
395 unsigned int *total_flags,
396 int mc_count, struct dev_addr_list *mc_list)
398 struct rt2x00_dev *rt2x00dev = hw->priv;
401 * Mask off any flags we are going to ignore
402 * from the total_flags field.
413 * Apply some rules to the filters:
414 * - Some filters imply different filters to be set.
415 * - Some things we can't filter out at all.
416 * - Multicast filter seems to kill broadcast traffic so never use it.
418 *total_flags |= FIF_ALLMULTI;
419 if (*total_flags & FIF_OTHER_BSS ||
420 *total_flags & FIF_PROMISC_IN_BSS)
421 *total_flags |= FIF_PROMISC_IN_BSS | FIF_OTHER_BSS;
424 * Check if there is any work left for us.
426 if (rt2x00dev->packet_filter == *total_flags)
428 rt2x00dev->packet_filter = *total_flags;
430 if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags))
431 rt2x00dev->ops->lib->config_filter(rt2x00dev, *total_flags);
433 queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->filter_work);
435 EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter);
437 #ifdef CONFIG_RT2X00_LIB_CRYPTO
438 static void memcpy_tkip(struct rt2x00lib_crypto *crypto, u8 *key, u8 key_len)
440 if (key_len > NL80211_TKIP_DATA_OFFSET_ENCR_KEY)
442 &key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY],
443 sizeof(crypto->key));
445 if (key_len > NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY)
446 memcpy(&crypto->tx_mic,
447 &key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY],
448 sizeof(crypto->tx_mic));
450 if (key_len > NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY)
451 memcpy(&crypto->rx_mic,
452 &key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY],
453 sizeof(crypto->rx_mic));
456 int rt2x00mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
457 struct ieee80211_vif *vif, struct ieee80211_sta *sta,
458 struct ieee80211_key_conf *key)
460 struct rt2x00_dev *rt2x00dev = hw->priv;
461 struct rt2x00_intf *intf = vif_to_intf(vif);
462 int (*set_key) (struct rt2x00_dev *rt2x00dev,
463 struct rt2x00lib_crypto *crypto,
464 struct ieee80211_key_conf *key);
465 struct rt2x00lib_crypto crypto;
466 static const u8 bcast_addr[ETH_ALEN] =
467 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, };
469 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
471 else if (!test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags))
473 else if (key->keylen > 32)
476 memset(&crypto, 0, sizeof(crypto));
479 * When in STA mode, bssidx is always 0 otherwise local_address[5]
480 * contains the bss number, see BSS_ID_MASK comments for details.
482 if (rt2x00dev->intf_sta_count)
485 crypto.bssidx = intf->mac[5] & (rt2x00dev->ops->max_ap_intf - 1);
487 crypto.cipher = rt2x00crypto_key_to_cipher(key);
488 if (crypto.cipher == CIPHER_NONE)
494 /* some drivers need the AID */
495 crypto.aid = sta->aid;
496 crypto.address = sta->addr;
498 crypto.address = bcast_addr;
500 if (crypto.cipher == CIPHER_TKIP)
501 memcpy_tkip(&crypto, &key->key[0], key->keylen);
503 memcpy(&crypto.key, &key->key[0], key->keylen);
505 * Each BSS has a maximum of 4 shared keys.
506 * Shared key index values:
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).
523 if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
524 set_key = rt2x00dev->ops->lib->config_pairwise_key;
526 set_key = rt2x00dev->ops->lib->config_shared_key;
531 return set_key(rt2x00dev, &crypto, key);
533 EXPORT_SYMBOL_GPL(rt2x00mac_set_key);
534 #endif /* CONFIG_RT2X00_LIB_CRYPTO */
536 int rt2x00mac_get_stats(struct ieee80211_hw *hw,
537 struct ieee80211_low_level_stats *stats)
539 struct rt2x00_dev *rt2x00dev = hw->priv;
542 * The dot11ACKFailureCount, dot11RTSFailureCount and
543 * dot11RTSSuccessCount are updated in interrupt time.
544 * dot11FCSErrorCount is updated in the link tuner.
546 memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
550 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
552 int rt2x00mac_get_tx_stats(struct ieee80211_hw *hw,
553 struct ieee80211_tx_queue_stats *stats)
555 struct rt2x00_dev *rt2x00dev = hw->priv;
558 for (i = 0; i < rt2x00dev->ops->tx_queues; i++) {
559 stats[i].len = rt2x00dev->tx[i].length;
560 stats[i].limit = rt2x00dev->tx[i].limit;
561 stats[i].count = rt2x00dev->tx[i].count;
566 EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats);
568 void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
569 struct ieee80211_vif *vif,
570 struct ieee80211_bss_conf *bss_conf,
573 struct rt2x00_dev *rt2x00dev = hw->priv;
574 struct rt2x00_intf *intf = vif_to_intf(vif);
575 unsigned int delayed = 0;
576 int update_bssid = 0;
579 * Mac80211 might be calling this function while we are trying
580 * to remove the device or perhaps suspending it.
582 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
585 spin_lock(&intf->lock);
588 * conf->bssid can be NULL if coming from the internal
589 * beacon update routine.
591 if (changes & BSS_CHANGED_BSSID) {
593 memcpy(&intf->bssid, bss_conf->bssid, ETH_ALEN);
596 spin_unlock(&intf->lock);
599 * Call rt2x00_config_intf() outside of the spinlock context since
600 * the call will sleep for USB drivers. By using the ieee80211_if_conf
601 * values as arguments we make keep access to rt2x00_intf thread safe
602 * even without the lock.
604 if (changes & BSS_CHANGED_BSSID)
605 rt2x00lib_config_intf(rt2x00dev, intf, vif->type, NULL,
606 update_bssid ? bss_conf->bssid : NULL);
611 if (changes & (BSS_CHANGED_BEACON | BSS_CHANGED_BEACON_ENABLED))
612 rt2x00queue_update_beacon(rt2x00dev, vif,
613 bss_conf->enable_beacon);
616 * When the association status has changed we must reset the link
617 * tuner counter. This is because some drivers determine if they
618 * should perform link tuning based on the number of seconds
619 * while associated or not associated.
621 if (changes & BSS_CHANGED_ASSOC) {
622 rt2x00dev->link.count = 0;
625 rt2x00dev->intf_associated++;
627 rt2x00dev->intf_associated--;
629 if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags))
630 rt2x00leds_led_assoc(rt2x00dev,
631 !!rt2x00dev->intf_associated);
633 delayed |= DELAYED_LED_ASSOC;
637 * When the erp information has changed, we should perform
638 * additional configuration steps. For all other changes we are done.
640 if (changes & ~(BSS_CHANGED_ASSOC | BSS_CHANGED_HT)) {
641 if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags))
642 rt2x00lib_config_erp(rt2x00dev, intf, bss_conf);
644 delayed |= DELAYED_CONFIG_ERP;
647 spin_lock(&intf->lock);
649 intf->delayed_flags |= delayed;
650 schedule_work(&rt2x00dev->intf_work);
652 spin_unlock(&intf->lock);
654 EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
656 int rt2x00mac_conf_tx(struct ieee80211_hw *hw, u16 queue_idx,
657 const struct ieee80211_tx_queue_params *params)
659 struct rt2x00_dev *rt2x00dev = hw->priv;
660 struct data_queue *queue;
662 queue = rt2x00queue_get_queue(rt2x00dev, queue_idx);
663 if (unlikely(!queue))
667 * The passed variables are stored as real value ((2^n)-1).
668 * Ralink registers require to know the bit number 'n'.
670 if (params->cw_min > 0)
671 queue->cw_min = fls(params->cw_min);
673 queue->cw_min = 5; /* cw_min: 2^5 = 32. */
675 if (params->cw_max > 0)
676 queue->cw_max = fls(params->cw_max);
678 queue->cw_max = 10; /* cw_min: 2^10 = 1024. */
680 queue->aifs = params->aifs;
681 queue->txop = params->txop;
684 "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d, TXop: %d.\n",
685 queue_idx, queue->cw_min, queue->cw_max, queue->aifs, queue->txop);
689 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);