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);
135 dev_kfree_skb_any(skb);
140 * If CTS/RTS is required. create and queue that frame first.
141 * Make sure we have at least enough entries available to send
142 * this CTS/RTS frame as well as the data frame.
143 * Note that when the driver has set the set_rts_threshold()
144 * callback function it doesn't need software generation of
145 * either RTS or CTS-to-self frame and handles everything
146 * inside the hardware.
148 frame_control = le16_to_cpu(ieee80211hdr->frame_control);
149 if ((tx_info->control.rates[0].flags & (IEEE80211_TX_RC_USE_RTS_CTS |
150 IEEE80211_TX_RC_USE_CTS_PROTECT)) &&
151 !rt2x00dev->ops->hw->set_rts_threshold) {
152 if (rt2x00queue_available(queue) <= 1)
155 if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb))
159 if (rt2x00queue_write_tx_frame(queue, skb))
162 if (rt2x00queue_threshold(queue))
163 ieee80211_stop_queue(rt2x00dev->hw, qid);
168 ieee80211_stop_queue(rt2x00dev->hw, qid);
169 dev_kfree_skb_any(skb);
172 EXPORT_SYMBOL_GPL(rt2x00mac_tx);
174 int rt2x00mac_start(struct ieee80211_hw *hw)
176 struct rt2x00_dev *rt2x00dev = hw->priv;
178 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
181 return rt2x00lib_start(rt2x00dev);
183 EXPORT_SYMBOL_GPL(rt2x00mac_start);
185 void rt2x00mac_stop(struct ieee80211_hw *hw)
187 struct rt2x00_dev *rt2x00dev = hw->priv;
189 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
192 rt2x00lib_stop(rt2x00dev);
194 EXPORT_SYMBOL_GPL(rt2x00mac_stop);
196 int rt2x00mac_add_interface(struct ieee80211_hw *hw,
197 struct ieee80211_if_init_conf *conf)
199 struct rt2x00_dev *rt2x00dev = hw->priv;
200 struct rt2x00_intf *intf = vif_to_intf(conf->vif);
201 struct data_queue *queue = rt2x00queue_get_queue(rt2x00dev, QID_BEACON);
202 struct queue_entry *entry = NULL;
206 * Don't allow interfaces to be added
207 * the device has disappeared.
209 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
210 !test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
213 switch (conf->type) {
214 case NL80211_IFTYPE_AP:
216 * We don't support mixed combinations of
217 * sta and ap interfaces.
219 if (rt2x00dev->intf_sta_count)
223 * Check if we exceeded the maximum amount
224 * of supported interfaces.
226 if (rt2x00dev->intf_ap_count >= rt2x00dev->ops->max_ap_intf)
230 case NL80211_IFTYPE_STATION:
231 case NL80211_IFTYPE_ADHOC:
233 * We don't support mixed combinations of
234 * sta and ap interfaces.
236 if (rt2x00dev->intf_ap_count)
240 * Check if we exceeded the maximum amount
241 * of supported interfaces.
243 if (rt2x00dev->intf_sta_count >= rt2x00dev->ops->max_sta_intf)
252 * Loop through all beacon queues to find a free
253 * entry. Since there are as much beacon entries
254 * as the maximum interfaces, this search shouldn't
257 for (i = 0; i < queue->limit; i++) {
258 entry = &queue->entries[i];
259 if (!test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
263 if (unlikely(i == queue->limit))
267 * We are now absolutely sure the interface can be created,
268 * increase interface count and start initialization.
271 if (conf->type == NL80211_IFTYPE_AP)
272 rt2x00dev->intf_ap_count++;
274 rt2x00dev->intf_sta_count++;
276 spin_lock_init(&intf->lock);
277 spin_lock_init(&intf->seqlock);
278 intf->beacon = entry;
280 if (conf->type == NL80211_IFTYPE_AP)
281 memcpy(&intf->bssid, conf->mac_addr, ETH_ALEN);
282 memcpy(&intf->mac, conf->mac_addr, ETH_ALEN);
285 * The MAC adddress must be configured after the device
286 * has been initialized. Otherwise the device can reset
289 rt2x00lib_config_intf(rt2x00dev, intf, conf->type, intf->mac, NULL);
292 * Some filters depend on the current working mode. We can force
293 * an update during the next configure_filter() run by mac80211 by
294 * resetting the current packet_filter state.
296 rt2x00dev->packet_filter = 0;
300 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
302 void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
303 struct ieee80211_if_init_conf *conf)
305 struct rt2x00_dev *rt2x00dev = hw->priv;
306 struct rt2x00_intf *intf = vif_to_intf(conf->vif);
309 * Don't allow interfaces to be remove while
310 * either the device has disappeared or when
311 * no interface is present.
313 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
314 (conf->type == NL80211_IFTYPE_AP && !rt2x00dev->intf_ap_count) ||
315 (conf->type != NL80211_IFTYPE_AP && !rt2x00dev->intf_sta_count))
318 if (conf->type == NL80211_IFTYPE_AP)
319 rt2x00dev->intf_ap_count--;
321 rt2x00dev->intf_sta_count--;
324 * Release beacon entry so it is available for
325 * new interfaces again.
327 clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);
330 * Make sure the bssid and mac address registers
331 * are cleared to prevent false ACKing of frames.
333 rt2x00lib_config_intf(rt2x00dev, intf,
334 NL80211_IFTYPE_UNSPECIFIED, NULL, NULL);
336 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
338 int rt2x00mac_config(struct ieee80211_hw *hw, u32 changed)
340 struct rt2x00_dev *rt2x00dev = hw->priv;
341 struct ieee80211_conf *conf = &hw->conf;
346 * Mac80211 might be calling this function while we are trying
347 * to remove the device or perhaps suspending it.
349 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
353 * Only change device state when the radio is enabled. It does not
354 * matter what parameters we have configured when the radio is disabled
355 * because we won't be able to send or receive anyway. Also note that
356 * some configuration parameters (e.g. channel and antenna values) can
357 * only be set when the radio is enabled.
359 radio_on = test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags);
360 if (conf->radio_enabled) {
361 /* For programming the values, we have to turn RX off */
362 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
364 /* Enable the radio */
365 status = rt2x00lib_enable_radio(rt2x00dev);
366 if (unlikely(status))
370 * When we've just turned on the radio, we want to reprogram
371 * everything to ensure a consistent state
373 rt2x00lib_config(rt2x00dev, conf, changed);
375 /* Turn RX back on */
376 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
378 /* Disable the radio */
379 rt2x00lib_disable_radio(rt2x00dev);
384 EXPORT_SYMBOL_GPL(rt2x00mac_config);
386 int rt2x00mac_config_interface(struct ieee80211_hw *hw,
387 struct ieee80211_vif *vif,
388 struct ieee80211_if_conf *conf)
390 struct rt2x00_dev *rt2x00dev = hw->priv;
391 struct rt2x00_intf *intf = vif_to_intf(vif);
392 int update_bssid = 0;
396 * Mac80211 might be calling this function while we are trying
397 * to remove the device or perhaps suspending it.
399 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
402 spin_lock(&intf->lock);
405 * conf->bssid can be NULL if coming from the internal
406 * beacon update routine.
408 if (conf->changed & IEEE80211_IFCC_BSSID && conf->bssid) {
410 memcpy(&intf->bssid, conf->bssid, ETH_ALEN);
413 spin_unlock(&intf->lock);
416 * Call rt2x00_config_intf() outside of the spinlock context since
417 * the call will sleep for USB drivers. By using the ieee80211_if_conf
418 * values as arguments we make keep access to rt2x00_intf thread safe
419 * even without the lock.
421 rt2x00lib_config_intf(rt2x00dev, intf, vif->type, NULL,
422 update_bssid ? conf->bssid : NULL);
427 if (conf->changed & IEEE80211_IFCC_BEACON)
428 status = rt2x00queue_update_beacon(rt2x00dev, vif);
432 EXPORT_SYMBOL_GPL(rt2x00mac_config_interface);
434 void rt2x00mac_configure_filter(struct ieee80211_hw *hw,
435 unsigned int changed_flags,
436 unsigned int *total_flags,
437 int mc_count, struct dev_addr_list *mc_list)
439 struct rt2x00_dev *rt2x00dev = hw->priv;
442 * Mask off any flags we are going to ignore
443 * from the total_flags field.
454 * Apply some rules to the filters:
455 * - Some filters imply different filters to be set.
456 * - Some things we can't filter out at all.
457 * - Multicast filter seems to kill broadcast traffic so never use it.
459 *total_flags |= FIF_ALLMULTI;
460 if (*total_flags & FIF_OTHER_BSS ||
461 *total_flags & FIF_PROMISC_IN_BSS)
462 *total_flags |= FIF_PROMISC_IN_BSS | FIF_OTHER_BSS;
465 * Check if there is any work left for us.
467 if (rt2x00dev->packet_filter == *total_flags)
469 rt2x00dev->packet_filter = *total_flags;
471 if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags))
472 rt2x00dev->ops->lib->config_filter(rt2x00dev, *total_flags);
474 queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->filter_work);
476 EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter);
478 #ifdef CONFIG_RT2X00_LIB_CRYPTO
479 int rt2x00mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
480 const u8 *local_address, const u8 *address,
481 struct ieee80211_key_conf *key)
483 struct rt2x00_dev *rt2x00dev = hw->priv;
484 int (*set_key) (struct rt2x00_dev *rt2x00dev,
485 struct rt2x00lib_crypto *crypto,
486 struct ieee80211_key_conf *key);
487 struct rt2x00lib_crypto crypto;
489 if (!test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags))
491 else if (key->keylen > 32)
494 memset(&crypto, 0, sizeof(crypto));
497 * When in STA mode, bssidx is always 0 otherwise local_address[5]
498 * contains the bss number, see BSS_ID_MASK comments for details.
500 if (rt2x00dev->intf_sta_count)
504 local_address[5] & (rt2x00dev->ops->max_ap_intf - 1);
506 crypto.cipher = rt2x00crypto_key_to_cipher(key);
507 if (crypto.cipher == CIPHER_NONE)
511 crypto.address = address;
513 if (crypto.cipher == CIPHER_TKIP) {
514 if (key->keylen > NL80211_TKIP_DATA_OFFSET_ENCR_KEY)
516 &key->key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY],
519 if (key->keylen > NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY)
520 memcpy(&crypto.tx_mic,
521 &key->key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY],
522 sizeof(crypto.tx_mic));
524 if (key->keylen > NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY)
525 memcpy(&crypto.rx_mic,
526 &key->key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY],
527 sizeof(crypto.rx_mic));
529 memcpy(&crypto.key, &key->key[0], key->keylen);
532 * Each BSS has a maximum of 4 shared keys.
533 * Shared key index values:
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).
550 if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
551 set_key = rt2x00dev->ops->lib->config_pairwise_key;
553 set_key = rt2x00dev->ops->lib->config_shared_key;
558 return set_key(rt2x00dev, &crypto, key);
560 EXPORT_SYMBOL_GPL(rt2x00mac_set_key);
561 #endif /* CONFIG_RT2X00_LIB_CRYPTO */
563 int rt2x00mac_get_stats(struct ieee80211_hw *hw,
564 struct ieee80211_low_level_stats *stats)
566 struct rt2x00_dev *rt2x00dev = hw->priv;
569 * The dot11ACKFailureCount, dot11RTSFailureCount and
570 * dot11RTSSuccessCount are updated in interrupt time.
571 * dot11FCSErrorCount is updated in the link tuner.
573 memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
577 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
579 int rt2x00mac_get_tx_stats(struct ieee80211_hw *hw,
580 struct ieee80211_tx_queue_stats *stats)
582 struct rt2x00_dev *rt2x00dev = hw->priv;
585 for (i = 0; i < rt2x00dev->ops->tx_queues; i++) {
586 stats[i].len = rt2x00dev->tx[i].length;
587 stats[i].limit = rt2x00dev->tx[i].limit;
588 stats[i].count = rt2x00dev->tx[i].count;
593 EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats);
595 void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
596 struct ieee80211_vif *vif,
597 struct ieee80211_bss_conf *bss_conf,
600 struct rt2x00_dev *rt2x00dev = hw->priv;
601 struct rt2x00_intf *intf = vif_to_intf(vif);
602 unsigned int delayed = 0;
605 * When the association status has changed we must reset the link
606 * tuner counter. This is because some drivers determine if they
607 * should perform link tuning based on the number of seconds
608 * while associated or not associated.
610 if (changes & BSS_CHANGED_ASSOC) {
611 rt2x00dev->link.count = 0;
614 rt2x00dev->intf_associated++;
616 rt2x00dev->intf_associated--;
618 if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags))
619 rt2x00leds_led_assoc(rt2x00dev,
620 !!rt2x00dev->intf_associated);
622 delayed |= DELAYED_LED_ASSOC;
626 * When the erp information has changed, we should perform
627 * additional configuration steps. For all other changes we are done.
629 if (changes & (BSS_CHANGED_ERP_PREAMBLE | BSS_CHANGED_ERP_CTS_PROT)) {
630 if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags))
631 rt2x00lib_config_erp(rt2x00dev, intf, bss_conf);
633 delayed |= DELAYED_CONFIG_ERP;
636 spin_lock(&intf->lock);
637 memcpy(&intf->conf, bss_conf, sizeof(*bss_conf));
639 intf->delayed_flags |= delayed;
640 schedule_work(&rt2x00dev->intf_work);
642 spin_unlock(&intf->lock);
644 EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
646 int rt2x00mac_conf_tx(struct ieee80211_hw *hw, u16 queue_idx,
647 const struct ieee80211_tx_queue_params *params)
649 struct rt2x00_dev *rt2x00dev = hw->priv;
650 struct data_queue *queue;
652 queue = rt2x00queue_get_queue(rt2x00dev, queue_idx);
653 if (unlikely(!queue))
657 * The passed variables are stored as real value ((2^n)-1).
658 * Ralink registers require to know the bit number 'n'.
660 if (params->cw_min > 0)
661 queue->cw_min = fls(params->cw_min);
663 queue->cw_min = 5; /* cw_min: 2^5 = 32. */
665 if (params->cw_max > 0)
666 queue->cw_max = fls(params->cw_max);
668 queue->cw_max = 10; /* cw_min: 2^10 = 1024. */
670 queue->aifs = params->aifs;
671 queue->txop = params->txop;
674 "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d, TXop: %d.\n",
675 queue_idx, queue->cw_min, queue->cw_max, queue->aifs, queue->txop);
679 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);