2 Copyright (C) 2004 - 2008 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 #ifdef CONFIG_RT2X00_LIB_CRYPTO
83 if (!frag_skb->do_not_encrypt)
84 data_length += rt2x00crypto_tx_overhead(tx_info);
85 #endif /* CONFIG_RT2X00_LIB_CRYPTO */
87 if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
88 ieee80211_ctstoself_get(rt2x00dev->hw, tx_info->control.vif,
89 frag_skb->data, data_length, tx_info,
90 (struct ieee80211_cts *)(skb->data));
92 ieee80211_rts_get(rt2x00dev->hw, tx_info->control.vif,
93 frag_skb->data, data_length, tx_info,
94 (struct ieee80211_rts *)(skb->data));
96 retval = rt2x00queue_write_tx_frame(queue, skb);
98 dev_kfree_skb_any(skb);
99 WARNING(rt2x00dev, "Failed to send RTS/CTS frame.\n");
105 int rt2x00mac_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
107 struct rt2x00_dev *rt2x00dev = hw->priv;
108 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
109 struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data;
110 enum data_queue_qid qid = skb_get_queue_mapping(skb);
111 struct data_queue *queue;
115 * Mac80211 might be calling this function while we are trying
116 * to remove the device or perhaps suspending it.
117 * Note that we can only stop the TX queues inside the TX path
118 * due to possible race conditions in mac80211.
120 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
124 * Determine which queue to put packet on.
126 if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM &&
127 test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags))
128 queue = rt2x00queue_get_queue(rt2x00dev, QID_ATIM);
130 queue = rt2x00queue_get_queue(rt2x00dev, qid);
131 if (unlikely(!queue)) {
133 "Attempt to send packet over invalid queue %d.\n"
134 "Please file bug report to %s.\n", qid, DRV_PROJECT);
139 * If CTS/RTS is required. create and queue that frame first.
140 * Make sure we have at least enough entries available to send
141 * this CTS/RTS frame as well as the data frame.
142 * Note that when the driver has set the set_rts_threshold()
143 * callback function it doesn't need software generation of
144 * either RTS or CTS-to-self frame and handles everything
145 * inside the hardware.
147 frame_control = le16_to_cpu(ieee80211hdr->frame_control);
148 if ((tx_info->control.rates[0].flags & (IEEE80211_TX_RC_USE_RTS_CTS |
149 IEEE80211_TX_RC_USE_CTS_PROTECT)) &&
150 !rt2x00dev->ops->hw->set_rts_threshold) {
151 if (rt2x00queue_available(queue) <= 1)
154 if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb))
158 if (rt2x00queue_write_tx_frame(queue, skb))
161 if (rt2x00queue_threshold(queue))
162 ieee80211_stop_queue(rt2x00dev->hw, qid);
167 ieee80211_stop_queue(rt2x00dev->hw, qid);
168 dev_kfree_skb_any(skb);
171 EXPORT_SYMBOL_GPL(rt2x00mac_tx);
173 int rt2x00mac_start(struct ieee80211_hw *hw)
175 struct rt2x00_dev *rt2x00dev = hw->priv;
177 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
180 return rt2x00lib_start(rt2x00dev);
182 EXPORT_SYMBOL_GPL(rt2x00mac_start);
184 void rt2x00mac_stop(struct ieee80211_hw *hw)
186 struct rt2x00_dev *rt2x00dev = hw->priv;
188 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
191 rt2x00lib_stop(rt2x00dev);
193 EXPORT_SYMBOL_GPL(rt2x00mac_stop);
195 int rt2x00mac_add_interface(struct ieee80211_hw *hw,
196 struct ieee80211_if_init_conf *conf)
198 struct rt2x00_dev *rt2x00dev = hw->priv;
199 struct rt2x00_intf *intf = vif_to_intf(conf->vif);
200 struct data_queue *queue = rt2x00queue_get_queue(rt2x00dev, QID_BEACON);
201 struct queue_entry *entry = NULL;
205 * Don't allow interfaces to be added
206 * the device has disappeared.
208 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
209 !test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
212 switch (conf->type) {
213 case NL80211_IFTYPE_AP:
215 * We don't support mixed combinations of
216 * sta and ap interfaces.
218 if (rt2x00dev->intf_sta_count)
222 * Check if we exceeded the maximum amount
223 * of supported interfaces.
225 if (rt2x00dev->intf_ap_count >= rt2x00dev->ops->max_ap_intf)
229 case NL80211_IFTYPE_STATION:
230 case NL80211_IFTYPE_ADHOC:
232 * We don't support mixed combinations of
233 * sta and ap interfaces.
235 if (rt2x00dev->intf_ap_count)
239 * Check if we exceeded the maximum amount
240 * of supported interfaces.
242 if (rt2x00dev->intf_sta_count >= rt2x00dev->ops->max_sta_intf)
251 * Loop through all beacon queues to find a free
252 * entry. Since there are as much beacon entries
253 * as the maximum interfaces, this search shouldn't
256 for (i = 0; i < queue->limit; i++) {
257 entry = &queue->entries[i];
258 if (!test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
262 if (unlikely(i == queue->limit))
266 * We are now absolutely sure the interface can be created,
267 * increase interface count and start initialization.
270 if (conf->type == NL80211_IFTYPE_AP)
271 rt2x00dev->intf_ap_count++;
273 rt2x00dev->intf_sta_count++;
275 spin_lock_init(&intf->lock);
276 spin_lock_init(&intf->seqlock);
277 intf->beacon = entry;
279 if (conf->type == NL80211_IFTYPE_AP)
280 memcpy(&intf->bssid, conf->mac_addr, ETH_ALEN);
281 memcpy(&intf->mac, conf->mac_addr, ETH_ALEN);
284 * The MAC adddress must be configured after the device
285 * has been initialized. Otherwise the device can reset
288 rt2x00lib_config_intf(rt2x00dev, intf, conf->type, intf->mac, NULL);
291 * Some filters depend on the current working mode. We can force
292 * an update during the next configure_filter() run by mac80211 by
293 * resetting the current packet_filter state.
295 rt2x00dev->packet_filter = 0;
299 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
301 void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
302 struct ieee80211_if_init_conf *conf)
304 struct rt2x00_dev *rt2x00dev = hw->priv;
305 struct rt2x00_intf *intf = vif_to_intf(conf->vif);
308 * Don't allow interfaces to be remove while
309 * either the device has disappeared or when
310 * no interface is present.
312 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
313 (conf->type == NL80211_IFTYPE_AP && !rt2x00dev->intf_ap_count) ||
314 (conf->type != NL80211_IFTYPE_AP && !rt2x00dev->intf_sta_count))
317 if (conf->type == NL80211_IFTYPE_AP)
318 rt2x00dev->intf_ap_count--;
320 rt2x00dev->intf_sta_count--;
323 * Release beacon entry so it is available for
324 * new interfaces again.
326 clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);
329 * Make sure the bssid and mac address registers
330 * are cleared to prevent false ACKing of frames.
332 rt2x00lib_config_intf(rt2x00dev, intf,
333 NL80211_IFTYPE_UNSPECIFIED, NULL, NULL);
335 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
337 int rt2x00mac_config(struct ieee80211_hw *hw, u32 changed)
339 struct rt2x00_dev *rt2x00dev = hw->priv;
340 struct ieee80211_conf *conf = &hw->conf;
344 * Mac80211 might be calling this function while we are trying
345 * to remove the device or perhaps suspending it.
347 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
351 * Only change device state when the radio is enabled. It does not
352 * matter what parameters we have configured when the radio is disabled
353 * because we won't be able to send or receive anyway. Also note that
354 * some configuration parameters (e.g. channel and antenna values) can
355 * only be set when the radio is enabled.
357 if (conf->radio_enabled) {
358 /* For programming the values, we have to turn RX off */
359 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
361 /* Enable the radio */
362 status = rt2x00lib_enable_radio(rt2x00dev);
363 if (unlikely(status))
367 * When we've just turned on the radio, we want to reprogram
368 * everything to ensure a consistent state
370 rt2x00lib_config(rt2x00dev, conf, changed);
373 * The radio was enabled, configure the antenna to the
374 * default settings, the link tuner will later start
375 * continue configuring the antenna based on the software
376 * diversity. But for non-diversity configurations, we need
377 * to have configured the correct state now.
379 if (changed & IEEE80211_CONF_CHANGE_RADIO_ENABLED)
380 rt2x00lib_config_antenna(rt2x00dev,
381 &rt2x00dev->default_ant);
383 /* Turn RX back on */
384 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
386 /* Disable the radio */
387 rt2x00lib_disable_radio(rt2x00dev);
392 EXPORT_SYMBOL_GPL(rt2x00mac_config);
394 int rt2x00mac_config_interface(struct ieee80211_hw *hw,
395 struct ieee80211_vif *vif,
396 struct ieee80211_if_conf *conf)
398 struct rt2x00_dev *rt2x00dev = hw->priv;
399 struct rt2x00_intf *intf = vif_to_intf(vif);
400 int update_bssid = 0;
404 * Mac80211 might be calling this function while we are trying
405 * to remove the device or perhaps suspending it.
407 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
410 spin_lock(&intf->lock);
413 * conf->bssid can be NULL if coming from the internal
414 * beacon update routine.
416 if (conf->changed & IEEE80211_IFCC_BSSID && conf->bssid) {
418 memcpy(&intf->bssid, conf->bssid, ETH_ALEN);
421 spin_unlock(&intf->lock);
424 * Call rt2x00_config_intf() outside of the spinlock context since
425 * the call will sleep for USB drivers. By using the ieee80211_if_conf
426 * values as arguments we make keep access to rt2x00_intf thread safe
427 * even without the lock.
429 rt2x00lib_config_intf(rt2x00dev, intf, vif->type, NULL,
430 update_bssid ? conf->bssid : NULL);
435 if (conf->changed & IEEE80211_IFCC_BEACON)
436 status = rt2x00queue_update_beacon(rt2x00dev, vif);
440 EXPORT_SYMBOL_GPL(rt2x00mac_config_interface);
442 void rt2x00mac_configure_filter(struct ieee80211_hw *hw,
443 unsigned int changed_flags,
444 unsigned int *total_flags,
445 int mc_count, struct dev_addr_list *mc_list)
447 struct rt2x00_dev *rt2x00dev = hw->priv;
450 * Mask off any flags we are going to ignore
451 * from the total_flags field.
462 * Apply some rules to the filters:
463 * - Some filters imply different filters to be set.
464 * - Some things we can't filter out at all.
465 * - Multicast filter seems to kill broadcast traffic so never use it.
467 *total_flags |= FIF_ALLMULTI;
468 if (*total_flags & FIF_OTHER_BSS ||
469 *total_flags & FIF_PROMISC_IN_BSS)
470 *total_flags |= FIF_PROMISC_IN_BSS | FIF_OTHER_BSS;
473 * Check if there is any work left for us.
475 if (rt2x00dev->packet_filter == *total_flags)
477 rt2x00dev->packet_filter = *total_flags;
479 if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags))
480 rt2x00dev->ops->lib->config_filter(rt2x00dev, *total_flags);
482 queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->filter_work);
484 EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter);
486 #ifdef CONFIG_RT2X00_LIB_CRYPTO
487 int rt2x00mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
488 const u8 *local_address, const u8 *address,
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;
497 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
499 else if (!test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags))
501 else if (key->keylen > 32)
504 memset(&crypto, 0, sizeof(crypto));
507 * When in STA mode, bssidx is always 0 otherwise local_address[5]
508 * contains the bss number, see BSS_ID_MASK comments for details.
510 if (rt2x00dev->intf_sta_count)
514 local_address[5] & (rt2x00dev->ops->max_ap_intf - 1);
516 crypto.cipher = rt2x00crypto_key_to_cipher(key);
517 if (crypto.cipher == CIPHER_NONE)
521 crypto.address = address;
523 if (crypto.cipher == CIPHER_TKIP) {
524 if (key->keylen > NL80211_TKIP_DATA_OFFSET_ENCR_KEY)
526 &key->key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY],
529 if (key->keylen > NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY)
530 memcpy(&crypto.tx_mic,
531 &key->key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY],
532 sizeof(crypto.tx_mic));
534 if (key->keylen > NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY)
535 memcpy(&crypto.rx_mic,
536 &key->key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY],
537 sizeof(crypto.rx_mic));
539 memcpy(&crypto.key, &key->key[0], key->keylen);
542 * Each BSS has a maximum of 4 shared keys.
543 * Shared key index values:
551 * Both pairwise as shared key indeces are determined by
552 * driver. This is required because the hardware requires
553 * keys to be assigned in correct order (When key 1 is
554 * provided but key 0 is not, then the key is not found
555 * by the hardware during RX).
560 if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
561 set_key = rt2x00dev->ops->lib->config_pairwise_key;
563 set_key = rt2x00dev->ops->lib->config_shared_key;
568 return set_key(rt2x00dev, &crypto, key);
570 EXPORT_SYMBOL_GPL(rt2x00mac_set_key);
571 #endif /* CONFIG_RT2X00_LIB_CRYPTO */
573 int rt2x00mac_get_stats(struct ieee80211_hw *hw,
574 struct ieee80211_low_level_stats *stats)
576 struct rt2x00_dev *rt2x00dev = hw->priv;
579 * The dot11ACKFailureCount, dot11RTSFailureCount and
580 * dot11RTSSuccessCount are updated in interrupt time.
581 * dot11FCSErrorCount is updated in the link tuner.
583 memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
587 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
589 int rt2x00mac_get_tx_stats(struct ieee80211_hw *hw,
590 struct ieee80211_tx_queue_stats *stats)
592 struct rt2x00_dev *rt2x00dev = hw->priv;
595 for (i = 0; i < rt2x00dev->ops->tx_queues; i++) {
596 stats[i].len = rt2x00dev->tx[i].length;
597 stats[i].limit = rt2x00dev->tx[i].limit;
598 stats[i].count = rt2x00dev->tx[i].count;
603 EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats);
605 void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
606 struct ieee80211_vif *vif,
607 struct ieee80211_bss_conf *bss_conf,
610 struct rt2x00_dev *rt2x00dev = hw->priv;
611 struct rt2x00_intf *intf = vif_to_intf(vif);
612 unsigned int delayed = 0;
615 * When the association status has changed we must reset the link
616 * tuner counter. This is because some drivers determine if they
617 * should perform link tuning based on the number of seconds
618 * while associated or not associated.
620 if (changes & BSS_CHANGED_ASSOC) {
621 rt2x00dev->link.count = 0;
624 rt2x00dev->intf_associated++;
626 rt2x00dev->intf_associated--;
628 if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags))
629 rt2x00leds_led_assoc(rt2x00dev,
630 !!rt2x00dev->intf_associated);
632 delayed |= DELAYED_LED_ASSOC;
636 * When the erp information has changed, we should perform
637 * additional configuration steps. For all other changes we are done.
639 if (changes & (BSS_CHANGED_ERP_PREAMBLE | BSS_CHANGED_ERP_CTS_PROT)) {
640 if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags))
641 rt2x00lib_config_erp(rt2x00dev, intf, bss_conf);
643 delayed |= DELAYED_CONFIG_ERP;
646 spin_lock(&intf->lock);
648 intf->delayed_flags |= delayed;
649 schedule_work(&rt2x00dev->intf_work);
651 spin_unlock(&intf->lock);
653 EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
655 int rt2x00mac_conf_tx(struct ieee80211_hw *hw, u16 queue_idx,
656 const struct ieee80211_tx_queue_params *params)
658 struct rt2x00_dev *rt2x00dev = hw->priv;
659 struct data_queue *queue;
661 queue = rt2x00queue_get_queue(rt2x00dev, queue_idx);
662 if (unlikely(!queue))
666 * The passed variables are stored as real value ((2^n)-1).
667 * Ralink registers require to know the bit number 'n'.
669 if (params->cw_min > 0)
670 queue->cw_min = fls(params->cw_min);
672 queue->cw_min = 5; /* cw_min: 2^5 = 32. */
674 if (params->cw_max > 0)
675 queue->cw_max = fls(params->cw_max);
677 queue->cw_max = 10; /* cw_min: 2^10 = 1024. */
679 queue->aifs = params->aifs;
680 queue->txop = params->txop;
683 "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d, TXop: %d.\n",
684 queue_idx, queue->cw_min, queue->cw_max, queue->aifs, queue->txop);
688 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);