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 queue = rt2x00queue_get_queue(rt2x00dev, control->queue);
103 if (unlikely(!queue)) {
105 "Attempt to send packet over invalid queue %d.\n"
106 "Please file bug report to %s.\n",
107 control->queue, DRV_PROJECT);
108 dev_kfree_skb_any(skb);
113 * If CTS/RTS is required. and this frame is not CTS or RTS,
114 * create and queue that frame first. But make sure we have
115 * at least enough entries available to send this CTS/RTS
116 * frame as well as the data frame.
118 frame_control = le16_to_cpu(ieee80211hdr->frame_control);
119 if (!is_rts_frame(frame_control) && !is_cts_frame(frame_control) &&
120 (control->flags & (IEEE80211_TXCTL_USE_RTS_CTS |
121 IEEE80211_TXCTL_USE_CTS_PROTECT))) {
122 if (rt2x00queue_available(queue) <= 1) {
123 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
124 return NETDEV_TX_BUSY;
127 if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb, control)) {
128 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
129 return NETDEV_TX_BUSY;
134 * Initialize skb descriptor
136 skbdesc = get_skb_frame_desc(skb);
137 memset(skbdesc, 0, sizeof(*skbdesc));
139 if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, queue, skb, control)) {
140 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
141 return NETDEV_TX_BUSY;
144 if (rt2x00queue_full(queue))
145 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
147 if (rt2x00dev->ops->lib->kick_tx_queue)
148 rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);
152 EXPORT_SYMBOL_GPL(rt2x00mac_tx);
154 int rt2x00mac_start(struct ieee80211_hw *hw)
156 struct rt2x00_dev *rt2x00dev = hw->priv;
158 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
161 return rt2x00lib_start(rt2x00dev);
163 EXPORT_SYMBOL_GPL(rt2x00mac_start);
165 void rt2x00mac_stop(struct ieee80211_hw *hw)
167 struct rt2x00_dev *rt2x00dev = hw->priv;
169 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
172 rt2x00lib_stop(rt2x00dev);
174 EXPORT_SYMBOL_GPL(rt2x00mac_stop);
176 int rt2x00mac_add_interface(struct ieee80211_hw *hw,
177 struct ieee80211_if_init_conf *conf)
179 struct rt2x00_dev *rt2x00dev = hw->priv;
180 struct rt2x00_intf *intf = vif_to_intf(conf->vif);
181 struct data_queue *queue =
182 rt2x00queue_get_queue(rt2x00dev, RT2X00_BCN_QUEUE_BEACON);
183 struct queue_entry *entry = NULL;
187 * Don't allow interfaces to be added
188 * the device has disappeared.
190 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
191 !test_bit(DEVICE_STARTED, &rt2x00dev->flags))
195 * When we don't support mixed interfaces (a combination
196 * of sta and ap virtual interfaces) then we can only
197 * add this interface when the rival interface count is 0.
199 if (!test_bit(DRIVER_SUPPORT_MIXED_INTERFACES, &rt2x00dev->flags) &&
200 ((conf->type == IEEE80211_IF_TYPE_AP && rt2x00dev->intf_sta_count) ||
201 (conf->type != IEEE80211_IF_TYPE_AP && rt2x00dev->intf_ap_count)))
205 * Check if we exceeded the maximum amount of supported interfaces.
207 if ((conf->type == IEEE80211_IF_TYPE_AP &&
208 rt2x00dev->intf_ap_count >= rt2x00dev->ops->max_ap_intf) ||
209 (conf->type != IEEE80211_IF_TYPE_AP &&
210 rt2x00dev->intf_sta_count >= rt2x00dev->ops->max_sta_intf))
214 * Loop through all beacon queues to find a free
215 * entry. Since there are as much beacon entries
216 * as the maximum interfaces, this search shouldn't
219 for (i = 0; i < queue->limit; i++) {
220 entry = &queue->entries[i];
221 if (!__test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
225 if (unlikely(i == queue->limit))
229 * We are now absolutely sure the interface can be created,
230 * increase interface count and start initialization.
233 if (conf->type == IEEE80211_IF_TYPE_AP)
234 rt2x00dev->intf_ap_count++;
236 rt2x00dev->intf_sta_count++;
238 spin_lock_init(&intf->lock);
239 intf->beacon = entry;
241 if (conf->type == IEEE80211_IF_TYPE_AP)
242 memcpy(&intf->bssid, conf->mac_addr, ETH_ALEN);
243 memcpy(&intf->mac, conf->mac_addr, ETH_ALEN);
246 * The MAC adddress must be configured after the device
247 * has been initialized. Otherwise the device can reset
250 rt2x00lib_config_intf(rt2x00dev, intf, conf->type, intf->mac, NULL);
254 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
256 void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
257 struct ieee80211_if_init_conf *conf)
259 struct rt2x00_dev *rt2x00dev = hw->priv;
260 struct rt2x00_intf *intf = vif_to_intf(conf->vif);
263 * Don't allow interfaces to be remove while
264 * either the device has disappeared or when
265 * no interface is present.
267 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
268 (conf->type == IEEE80211_IF_TYPE_AP && !rt2x00dev->intf_ap_count) ||
269 (conf->type != IEEE80211_IF_TYPE_AP && !rt2x00dev->intf_sta_count))
272 if (conf->type == IEEE80211_IF_TYPE_AP)
273 rt2x00dev->intf_ap_count--;
275 rt2x00dev->intf_sta_count--;
278 * Release beacon entry so it is available for
279 * new interfaces again.
281 __clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);
284 * Make sure the bssid and mac address registers
285 * are cleared to prevent false ACKing of frames.
287 rt2x00lib_config_intf(rt2x00dev, intf,
288 IEEE80211_IF_TYPE_INVALID, NULL, NULL);
290 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
292 int rt2x00mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
294 struct rt2x00_dev *rt2x00dev = hw->priv;
297 * Mac80211 might be calling this function while we are trying
298 * to remove the device or perhaps suspending it.
300 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
304 * Check if we need to disable the radio,
305 * if this is not the case, at least the RX must be disabled.
307 if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags)) {
308 if (!conf->radio_enabled)
309 rt2x00lib_disable_radio(rt2x00dev);
311 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
314 rt2x00lib_config(rt2x00dev, conf, 0);
317 * Reenable RX only if the radio should be on.
319 if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
320 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
321 else if (conf->radio_enabled)
322 return rt2x00lib_enable_radio(rt2x00dev);
326 EXPORT_SYMBOL_GPL(rt2x00mac_config);
328 int rt2x00mac_config_interface(struct ieee80211_hw *hw,
329 struct ieee80211_vif *vif,
330 struct ieee80211_if_conf *conf)
332 struct rt2x00_dev *rt2x00dev = hw->priv;
333 struct rt2x00_intf *intf = vif_to_intf(vif);
337 * Mac80211 might be calling this function while we are trying
338 * to remove the device or perhaps suspending it.
340 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
343 spin_lock(&intf->lock);
346 * If the interface does not work in master mode,
347 * then the bssid value in the interface structure
350 if (conf->type != IEEE80211_IF_TYPE_AP)
351 memcpy(&intf->bssid, conf->bssid, ETH_ALEN);
353 spin_unlock(&intf->lock);
356 * Call rt2x00_config_intf() outside of the spinlock context since
357 * the call will sleep for USB drivers. By using the ieee80211_if_conf
358 * values as arguments we make keep access to rt2x00_intf thread safe
359 * even without the lock.
361 rt2x00lib_config_intf(rt2x00dev, intf, conf->type, NULL, conf->bssid);
364 * We only need to initialize the beacon when master mode is enabled.
366 if (conf->type != IEEE80211_IF_TYPE_AP || !conf->beacon)
369 status = rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw,
371 conf->beacon_control);
373 dev_kfree_skb(conf->beacon);
377 EXPORT_SYMBOL_GPL(rt2x00mac_config_interface);
379 int rt2x00mac_get_stats(struct ieee80211_hw *hw,
380 struct ieee80211_low_level_stats *stats)
382 struct rt2x00_dev *rt2x00dev = hw->priv;
385 * The dot11ACKFailureCount, dot11RTSFailureCount and
386 * dot11RTSSuccessCount are updated in interrupt time.
387 * dot11FCSErrorCount is updated in the link tuner.
389 memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
393 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
395 int rt2x00mac_get_tx_stats(struct ieee80211_hw *hw,
396 struct ieee80211_tx_queue_stats *stats)
398 struct rt2x00_dev *rt2x00dev = hw->priv;
401 for (i = 0; i < hw->queues; i++) {
402 stats->data[i].len = rt2x00dev->tx[i].length;
403 stats->data[i].limit = rt2x00dev->tx[i].limit;
404 stats->data[i].count = rt2x00dev->tx[i].count;
409 EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats);
411 void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
412 struct ieee80211_vif *vif,
413 struct ieee80211_bss_conf *bss_conf,
416 struct rt2x00_dev *rt2x00dev = hw->priv;
417 struct rt2x00_intf *intf = vif_to_intf(vif);
420 * When the association status has changed we must reset the link
421 * tuner counter. This is because some drivers determine if they
422 * should perform link tuning based on the number of seconds
423 * while associated or not associated.
425 if (changes & BSS_CHANGED_ASSOC) {
426 rt2x00dev->link.count = 0;
429 rt2x00dev->intf_associated++;
431 rt2x00dev->intf_associated--;
435 * When the preamble mode has changed, we should perform additional
436 * configuration steps. For all other changes we are already done.
438 if (changes & BSS_CHANGED_ERP_PREAMBLE) {
439 rt2x00lib_config_preamble(rt2x00dev, intf,
440 bss_conf->use_short_preamble);
442 spin_lock(&intf->lock);
443 memcpy(&intf->conf, bss_conf, sizeof(*bss_conf));
444 spin_unlock(&intf->lock);
447 EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
449 int rt2x00mac_conf_tx(struct ieee80211_hw *hw, int queue_idx,
450 const struct ieee80211_tx_queue_params *params)
452 struct rt2x00_dev *rt2x00dev = hw->priv;
453 struct data_queue *queue;
455 queue = rt2x00queue_get_queue(rt2x00dev, queue_idx);
456 if (unlikely(!queue))
460 * The passed variables are stored as real value ((2^n)-1).
461 * Ralink registers require to know the bit number 'n'.
463 if (params->cw_min > 0)
464 queue->cw_min = fls(params->cw_min);
466 queue->cw_min = 5; /* cw_min: 2^5 = 32. */
468 if (params->cw_max > 0)
469 queue->cw_max = fls(params->cw_max);
471 queue->cw_max = 10; /* cw_min: 2^10 = 1024. */
473 if (params->aifs >= 0)
474 queue->aifs = params->aifs;
479 "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d.\n",
480 queue_idx, queue->cw_min, queue->cw_max, queue->aifs);
484 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);