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;
41 if (tx_info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)
42 size = sizeof(struct ieee80211_cts);
44 size = sizeof(struct ieee80211_rts);
46 skb = dev_alloc_skb(size + rt2x00dev->hw->extra_tx_headroom);
48 WARNING(rt2x00dev, "Failed to create RTS/CTS frame.\n");
49 return NETDEV_TX_BUSY;
52 skb_reserve(skb, rt2x00dev->hw->extra_tx_headroom);
56 * Copy TX information over from original frame to
57 * RTS/CTS frame. Note that we set the no encryption flag
58 * since we don't want this frame to be encrypted.
59 * RTS frames should be acked, while CTS-to-self frames
60 * should not. The ready for TX flag is cleared to prevent
61 * it being automatically send when the descriptor is
62 * written to the hardware.
64 memcpy(skb->cb, frag_skb->cb, sizeof(skb->cb));
65 rts_info = IEEE80211_SKB_CB(skb);
66 rts_info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
67 rts_info->flags &= ~IEEE80211_TX_CTL_USE_CTS_PROTECT;
68 rts_info->flags &= ~IEEE80211_TX_CTL_REQ_TX_STATUS;
70 if (tx_info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)
71 rts_info->flags |= IEEE80211_TX_CTL_NO_ACK;
73 rts_info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
75 if (tx_info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)
76 ieee80211_ctstoself_get(rt2x00dev->hw, tx_info->control.vif,
77 frag_skb->data, size, tx_info,
78 (struct ieee80211_cts *)(skb->data));
80 ieee80211_rts_get(rt2x00dev->hw, tx_info->control.vif,
81 frag_skb->data, size, tx_info,
82 (struct ieee80211_rts *)(skb->data));
84 if (rt2x00queue_write_tx_frame(queue, skb)) {
85 WARNING(rt2x00dev, "Failed to send RTS/CTS frame.\n");
86 return NETDEV_TX_BUSY;
92 int rt2x00mac_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
94 struct rt2x00_dev *rt2x00dev = hw->priv;
95 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
96 struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data;
97 enum data_queue_qid qid = skb_get_queue_mapping(skb);
98 struct data_queue *queue;
102 * Mac80211 might be calling this function while we are trying
103 * to remove the device or perhaps suspending it.
104 * Note that we can only stop the TX queues inside the TX path
105 * due to possible race conditions in mac80211.
107 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags)) {
108 ieee80211_stop_queues(hw);
109 dev_kfree_skb_any(skb);
114 * Determine which queue to put packet on.
116 if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM &&
117 test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags))
118 queue = rt2x00queue_get_queue(rt2x00dev, QID_ATIM);
120 queue = rt2x00queue_get_queue(rt2x00dev, qid);
121 if (unlikely(!queue)) {
123 "Attempt to send packet over invalid queue %d.\n"
124 "Please file bug report to %s.\n", qid, DRV_PROJECT);
125 dev_kfree_skb_any(skb);
130 * If CTS/RTS is required. create and queue that frame first.
131 * Make sure we have at least enough entries available to send
132 * this CTS/RTS frame as well as the data frame.
133 * Note that when the driver has set the set_rts_threshold()
134 * callback function it doesn't need software generation of
135 * either RTS or CTS-to-self frame and handles everything
136 * inside the hardware.
138 frame_control = le16_to_cpu(ieee80211hdr->frame_control);
139 if ((tx_info->flags & (IEEE80211_TX_CTL_USE_RTS_CTS |
140 IEEE80211_TX_CTL_USE_CTS_PROTECT)) &&
141 !rt2x00dev->ops->hw->set_rts_threshold) {
142 if (rt2x00queue_available(queue) <= 1) {
143 ieee80211_stop_queue(rt2x00dev->hw, qid);
144 return NETDEV_TX_BUSY;
147 if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb)) {
148 ieee80211_stop_queue(rt2x00dev->hw, qid);
149 return NETDEV_TX_BUSY;
153 if (rt2x00queue_write_tx_frame(queue, skb)) {
154 ieee80211_stop_queue(rt2x00dev->hw, qid);
155 return NETDEV_TX_BUSY;
158 if (rt2x00queue_threshold(queue))
159 ieee80211_stop_queue(rt2x00dev->hw, qid);
163 EXPORT_SYMBOL_GPL(rt2x00mac_tx);
165 int rt2x00mac_start(struct ieee80211_hw *hw)
167 struct rt2x00_dev *rt2x00dev = hw->priv;
169 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
172 return rt2x00lib_start(rt2x00dev);
174 EXPORT_SYMBOL_GPL(rt2x00mac_start);
176 void rt2x00mac_stop(struct ieee80211_hw *hw)
178 struct rt2x00_dev *rt2x00dev = hw->priv;
180 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
183 rt2x00lib_stop(rt2x00dev);
185 EXPORT_SYMBOL_GPL(rt2x00mac_stop);
187 int rt2x00mac_add_interface(struct ieee80211_hw *hw,
188 struct ieee80211_if_init_conf *conf)
190 struct rt2x00_dev *rt2x00dev = hw->priv;
191 struct rt2x00_intf *intf = vif_to_intf(conf->vif);
192 struct data_queue *queue = rt2x00queue_get_queue(rt2x00dev, QID_BEACON);
193 struct queue_entry *entry = NULL;
197 * Don't allow interfaces to be added
198 * the device has disappeared.
200 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
201 !test_bit(DEVICE_STARTED, &rt2x00dev->flags))
205 * We don't support mixed combinations of sta and ap virtual
206 * interfaces. We can only add this interface when the rival
207 * interface count is 0.
209 if ((conf->type == IEEE80211_IF_TYPE_AP && rt2x00dev->intf_sta_count) ||
210 (conf->type != IEEE80211_IF_TYPE_AP && rt2x00dev->intf_ap_count))
214 * Check if we exceeded the maximum amount of supported interfaces.
216 if ((conf->type == IEEE80211_IF_TYPE_AP &&
217 rt2x00dev->intf_ap_count >= rt2x00dev->ops->max_ap_intf) ||
218 (conf->type != IEEE80211_IF_TYPE_AP &&
219 rt2x00dev->intf_sta_count >= rt2x00dev->ops->max_sta_intf))
223 * Loop through all beacon queues to find a free
224 * entry. Since there are as much beacon entries
225 * as the maximum interfaces, this search shouldn't
228 for (i = 0; i < queue->limit; i++) {
229 entry = &queue->entries[i];
230 if (!__test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
234 if (unlikely(i == queue->limit))
238 * We are now absolutely sure the interface can be created,
239 * increase interface count and start initialization.
242 if (conf->type == IEEE80211_IF_TYPE_AP)
243 rt2x00dev->intf_ap_count++;
245 rt2x00dev->intf_sta_count++;
247 spin_lock_init(&intf->lock);
248 intf->beacon = entry;
250 if (conf->type == IEEE80211_IF_TYPE_AP)
251 memcpy(&intf->bssid, conf->mac_addr, ETH_ALEN);
252 memcpy(&intf->mac, conf->mac_addr, ETH_ALEN);
255 * The MAC adddress must be configured after the device
256 * has been initialized. Otherwise the device can reset
259 rt2x00lib_config_intf(rt2x00dev, intf, conf->type, intf->mac, NULL);
262 * Some filters depend on the current working mode. We can force
263 * an update during the next configure_filter() run by mac80211 by
264 * resetting the current packet_filter state.
266 rt2x00dev->packet_filter = 0;
270 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
272 void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
273 struct ieee80211_if_init_conf *conf)
275 struct rt2x00_dev *rt2x00dev = hw->priv;
276 struct rt2x00_intf *intf = vif_to_intf(conf->vif);
279 * Don't allow interfaces to be remove while
280 * either the device has disappeared or when
281 * no interface is present.
283 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
284 (conf->type == IEEE80211_IF_TYPE_AP && !rt2x00dev->intf_ap_count) ||
285 (conf->type != IEEE80211_IF_TYPE_AP && !rt2x00dev->intf_sta_count))
288 if (conf->type == IEEE80211_IF_TYPE_AP)
289 rt2x00dev->intf_ap_count--;
291 rt2x00dev->intf_sta_count--;
294 * Release beacon entry so it is available for
295 * new interfaces again.
297 __clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);
300 * Make sure the bssid and mac address registers
301 * are cleared to prevent false ACKing of frames.
303 rt2x00lib_config_intf(rt2x00dev, intf,
304 IEEE80211_IF_TYPE_INVALID, NULL, NULL);
306 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
308 int rt2x00mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
310 struct rt2x00_dev *rt2x00dev = hw->priv;
313 * Mac80211 might be calling this function while we are trying
314 * to remove the device or perhaps suspending it.
316 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
320 * Check if we need to disable the radio,
321 * if this is not the case, at least the RX must be disabled.
323 if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags)) {
324 if (!conf->radio_enabled)
325 rt2x00lib_disable_radio(rt2x00dev);
327 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
330 rt2x00lib_config(rt2x00dev, conf, 0);
333 * Reenable RX only if the radio should be on.
335 if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
336 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
337 else if (conf->radio_enabled)
338 return rt2x00lib_enable_radio(rt2x00dev);
342 EXPORT_SYMBOL_GPL(rt2x00mac_config);
344 int rt2x00mac_config_interface(struct ieee80211_hw *hw,
345 struct ieee80211_vif *vif,
346 struct ieee80211_if_conf *conf)
348 struct rt2x00_dev *rt2x00dev = hw->priv;
349 struct rt2x00_intf *intf = vif_to_intf(vif);
353 * Mac80211 might be calling this function while we are trying
354 * to remove the device or perhaps suspending it.
356 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
359 spin_lock(&intf->lock);
362 * If the interface does not work in master mode,
363 * then the bssid value in the interface structure
366 if (conf->type != IEEE80211_IF_TYPE_AP)
367 memcpy(&intf->bssid, conf->bssid, ETH_ALEN);
369 spin_unlock(&intf->lock);
372 * Call rt2x00_config_intf() outside of the spinlock context since
373 * the call will sleep for USB drivers. By using the ieee80211_if_conf
374 * values as arguments we make keep access to rt2x00_intf thread safe
375 * even without the lock.
377 rt2x00lib_config_intf(rt2x00dev, intf, conf->type, NULL, conf->bssid);
380 * We only need to initialize the beacon when master mode is enabled.
382 if (conf->type != IEEE80211_IF_TYPE_AP || !conf->beacon)
385 status = rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw, conf->beacon);
387 dev_kfree_skb(conf->beacon);
391 EXPORT_SYMBOL_GPL(rt2x00mac_config_interface);
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 int rt2x00mac_get_stats(struct ieee80211_hw *hw,
438 struct ieee80211_low_level_stats *stats)
440 struct rt2x00_dev *rt2x00dev = hw->priv;
443 * The dot11ACKFailureCount, dot11RTSFailureCount and
444 * dot11RTSSuccessCount are updated in interrupt time.
445 * dot11FCSErrorCount is updated in the link tuner.
447 memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
451 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
453 int rt2x00mac_get_tx_stats(struct ieee80211_hw *hw,
454 struct ieee80211_tx_queue_stats *stats)
456 struct rt2x00_dev *rt2x00dev = hw->priv;
459 for (i = 0; i < rt2x00dev->ops->tx_queues; i++) {
460 stats[i].len = rt2x00dev->tx[i].length;
461 stats[i].limit = rt2x00dev->tx[i].limit;
462 stats[i].count = rt2x00dev->tx[i].count;
467 EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats);
469 void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
470 struct ieee80211_vif *vif,
471 struct ieee80211_bss_conf *bss_conf,
474 struct rt2x00_dev *rt2x00dev = hw->priv;
475 struct rt2x00_intf *intf = vif_to_intf(vif);
476 unsigned int delayed = 0;
479 * When the association status has changed we must reset the link
480 * tuner counter. This is because some drivers determine if they
481 * should perform link tuning based on the number of seconds
482 * while associated or not associated.
484 if (changes & BSS_CHANGED_ASSOC) {
485 rt2x00dev->link.count = 0;
488 rt2x00dev->intf_associated++;
490 rt2x00dev->intf_associated--;
492 if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags))
493 rt2x00leds_led_assoc(rt2x00dev,
494 !!rt2x00dev->intf_associated);
496 delayed |= DELAYED_LED_ASSOC;
500 * When the erp information has changed, we should perform
501 * additional configuration steps. For all other changes we are done.
503 if (changes & BSS_CHANGED_ERP_PREAMBLE) {
504 if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags))
505 rt2x00lib_config_erp(rt2x00dev, intf, bss_conf);
507 delayed |= DELAYED_CONFIG_ERP;
510 spin_lock(&intf->lock);
511 memcpy(&intf->conf, bss_conf, sizeof(*bss_conf));
513 intf->delayed_flags |= delayed;
514 queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->intf_work);
516 spin_unlock(&intf->lock);
518 EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
520 int rt2x00mac_conf_tx(struct ieee80211_hw *hw, u16 queue_idx,
521 const struct ieee80211_tx_queue_params *params)
523 struct rt2x00_dev *rt2x00dev = hw->priv;
524 struct data_queue *queue;
526 queue = rt2x00queue_get_queue(rt2x00dev, queue_idx);
527 if (unlikely(!queue))
531 * The passed variables are stored as real value ((2^n)-1).
532 * Ralink registers require to know the bit number 'n'.
534 if (params->cw_min > 0)
535 queue->cw_min = fls(params->cw_min);
537 queue->cw_min = 5; /* cw_min: 2^5 = 32. */
539 if (params->cw_max > 0)
540 queue->cw_max = fls(params->cw_max);
542 queue->cw_max = 10; /* cw_min: 2^10 = 1024. */
544 if (params->aifs >= 0)
545 queue->aifs = params->aifs;
550 "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d.\n",
551 queue_idx, queue->cw_min, queue->cw_max, queue->aifs);
555 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);