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,
35 struct ieee80211_tx_control *control)
37 struct skb_frame_desc *skbdesc;
41 if (control->flags & IEEE80211_TXCTL_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);
55 if (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
56 ieee80211_ctstoself_get(rt2x00dev->hw, control->vif,
57 frag_skb->data, frag_skb->len, control,
58 (struct ieee80211_cts *)(skb->data));
60 ieee80211_rts_get(rt2x00dev->hw, control->vif,
61 frag_skb->data, frag_skb->len, control,
62 (struct ieee80211_rts *)(skb->data));
65 * Initialize skb descriptor
67 skbdesc = get_skb_frame_desc(skb);
68 memset(skbdesc, 0, sizeof(*skbdesc));
69 skbdesc->flags |= FRAME_DESC_DRIVER_GENERATED;
71 if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, queue, skb, control)) {
72 WARNING(rt2x00dev, "Failed to send RTS/CTS frame.\n");
73 return NETDEV_TX_BUSY;
79 int rt2x00mac_tx(struct ieee80211_hw *hw, struct sk_buff *skb,
80 struct ieee80211_tx_control *control)
82 struct rt2x00_dev *rt2x00dev = hw->priv;
83 struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data;
84 struct data_queue *queue;
85 struct skb_frame_desc *skbdesc;
89 * Mac80211 might be calling this function while we are trying
90 * to remove the device or perhaps suspending it.
91 * Note that we can only stop the TX queues inside the TX path
92 * due to possible race conditions in mac80211.
94 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags)) {
95 ieee80211_stop_queues(hw);
100 * Determine which queue to put packet on.
102 if (control->flags & IEEE80211_TXCTL_SEND_AFTER_DTIM &&
103 test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags))
104 queue = rt2x00queue_get_queue(rt2x00dev, RT2X00_BCN_QUEUE_ATIM);
106 queue = rt2x00queue_get_queue(rt2x00dev, control->queue);
107 if (unlikely(!queue)) {
109 "Attempt to send packet over invalid queue %d.\n"
110 "Please file bug report to %s.\n",
111 control->queue, DRV_PROJECT);
112 dev_kfree_skb_any(skb);
117 * If CTS/RTS is required. and this frame is not CTS or RTS,
118 * create and queue that frame first. But make sure we have
119 * at least enough entries available to send this CTS/RTS
120 * frame as well as the data frame.
121 * Note that when the driver has set the set_rts_threshold()
122 * callback function it doesn't need software generation of
123 * neither RTS or CTS-to-self frames and handles everything
124 * inside the hardware.
126 frame_control = le16_to_cpu(ieee80211hdr->frame_control);
127 if (!is_rts_frame(frame_control) && !is_cts_frame(frame_control) &&
128 (control->flags & (IEEE80211_TXCTL_USE_RTS_CTS |
129 IEEE80211_TXCTL_USE_CTS_PROTECT)) &&
130 !rt2x00dev->ops->hw->set_rts_threshold) {
131 if (rt2x00queue_available(queue) <= 1) {
132 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
133 return NETDEV_TX_BUSY;
136 if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb, control)) {
137 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
138 return NETDEV_TX_BUSY;
143 * Initialize skb descriptor
145 skbdesc = get_skb_frame_desc(skb);
146 memset(skbdesc, 0, sizeof(*skbdesc));
148 if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, queue, skb, control)) {
149 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
150 return NETDEV_TX_BUSY;
153 if (rt2x00queue_full(queue))
154 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
156 if (rt2x00dev->ops->lib->kick_tx_queue)
157 rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);
161 EXPORT_SYMBOL_GPL(rt2x00mac_tx);
163 int rt2x00mac_start(struct ieee80211_hw *hw)
165 struct rt2x00_dev *rt2x00dev = hw->priv;
167 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
170 return rt2x00lib_start(rt2x00dev);
172 EXPORT_SYMBOL_GPL(rt2x00mac_start);
174 void rt2x00mac_stop(struct ieee80211_hw *hw)
176 struct rt2x00_dev *rt2x00dev = hw->priv;
178 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
181 rt2x00lib_stop(rt2x00dev);
183 EXPORT_SYMBOL_GPL(rt2x00mac_stop);
185 int rt2x00mac_add_interface(struct ieee80211_hw *hw,
186 struct ieee80211_if_init_conf *conf)
188 struct rt2x00_dev *rt2x00dev = hw->priv;
189 struct rt2x00_intf *intf = vif_to_intf(conf->vif);
190 struct data_queue *queue =
191 rt2x00queue_get_queue(rt2x00dev, RT2X00_BCN_QUEUE_BEACON);
192 struct queue_entry *entry = NULL;
196 * Don't allow interfaces to be added
197 * the device has disappeared.
199 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
200 !test_bit(DEVICE_STARTED, &rt2x00dev->flags))
204 * When we don't support mixed interfaces (a combination
205 * of sta and ap virtual interfaces) then we can only
206 * add this interface when the rival interface count is 0.
208 if (!test_bit(DRIVER_SUPPORT_MIXED_INTERFACES, &rt2x00dev->flags) &&
209 ((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,
387 conf->beacon_control);
389 dev_kfree_skb(conf->beacon);
393 EXPORT_SYMBOL_GPL(rt2x00mac_config_interface);
395 void rt2x00mac_configure_filter(struct ieee80211_hw *hw,
396 unsigned int changed_flags,
397 unsigned int *total_flags,
398 int mc_count, struct dev_addr_list *mc_list)
400 struct rt2x00_dev *rt2x00dev = hw->priv;
403 * Mask off any flags we are going to ignore
404 * from the total_flags field.
415 * Apply some rules to the filters:
416 * - Some filters imply different filters to be set.
417 * - Some things we can't filter out at all.
418 * - Multicast filter seems to kill broadcast traffic so never use it.
420 *total_flags |= FIF_ALLMULTI;
421 if (*total_flags & FIF_OTHER_BSS ||
422 *total_flags & FIF_PROMISC_IN_BSS)
423 *total_flags |= FIF_PROMISC_IN_BSS | FIF_OTHER_BSS;
426 * Check if there is any work left for us.
428 if (rt2x00dev->packet_filter == *total_flags)
430 rt2x00dev->packet_filter = *total_flags;
432 if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags))
433 rt2x00dev->ops->lib->config_filter(rt2x00dev, *total_flags);
435 queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->filter_work);
437 EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter);
439 int rt2x00mac_get_stats(struct ieee80211_hw *hw,
440 struct ieee80211_low_level_stats *stats)
442 struct rt2x00_dev *rt2x00dev = hw->priv;
445 * The dot11ACKFailureCount, dot11RTSFailureCount and
446 * dot11RTSSuccessCount are updated in interrupt time.
447 * dot11FCSErrorCount is updated in the link tuner.
449 memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
453 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
455 int rt2x00mac_get_tx_stats(struct ieee80211_hw *hw,
456 struct ieee80211_tx_queue_stats *stats)
458 struct rt2x00_dev *rt2x00dev = hw->priv;
461 for (i = 0; i < hw->queues; i++) {
462 stats->data[i].len = rt2x00dev->tx[i].length;
463 stats->data[i].limit = rt2x00dev->tx[i].limit;
464 stats->data[i].count = rt2x00dev->tx[i].count;
469 EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats);
471 void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
472 struct ieee80211_vif *vif,
473 struct ieee80211_bss_conf *bss_conf,
476 struct rt2x00_dev *rt2x00dev = hw->priv;
477 struct rt2x00_intf *intf = vif_to_intf(vif);
478 unsigned int delayed = 0;
481 * When the association status has changed we must reset the link
482 * tuner counter. This is because some drivers determine if they
483 * should perform link tuning based on the number of seconds
484 * while associated or not associated.
486 if (changes & BSS_CHANGED_ASSOC) {
487 rt2x00dev->link.count = 0;
490 rt2x00dev->intf_associated++;
492 rt2x00dev->intf_associated--;
494 if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags))
495 rt2x00leds_led_assoc(rt2x00dev,
496 !!rt2x00dev->intf_associated);
498 delayed |= DELAYED_LED_ASSOC;
502 * When the erp information has changed, we should perform
503 * additional configuration steps. For all other changes we are done.
505 if (changes & BSS_CHANGED_ERP_PREAMBLE) {
506 if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags))
507 rt2x00lib_config_erp(rt2x00dev, intf, bss_conf);
509 delayed |= DELAYED_CONFIG_ERP;
512 spin_lock(&intf->lock);
513 memcpy(&intf->conf, bss_conf, sizeof(*bss_conf));
515 intf->delayed_flags |= delayed;
516 queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->intf_work);
518 spin_unlock(&intf->lock);
520 EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
522 int rt2x00mac_conf_tx(struct ieee80211_hw *hw, int queue_idx,
523 const struct ieee80211_tx_queue_params *params)
525 struct rt2x00_dev *rt2x00dev = hw->priv;
526 struct data_queue *queue;
528 queue = rt2x00queue_get_queue(rt2x00dev, queue_idx);
529 if (unlikely(!queue))
533 * The passed variables are stored as real value ((2^n)-1).
534 * Ralink registers require to know the bit number 'n'.
536 if (params->cw_min > 0)
537 queue->cw_min = fls(params->cw_min);
539 queue->cw_min = 5; /* cw_min: 2^5 = 32. */
541 if (params->cw_max > 0)
542 queue->cw_max = fls(params->cw_max);
544 queue->cw_max = 10; /* cw_min: 2^10 = 1024. */
546 if (params->aifs >= 0)
547 queue->aifs = params->aifs;
552 "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d.\n",
553 queue_idx, queue->cw_min, queue->cw_max, queue->aifs);
557 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);