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)
40 if (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
41 size = sizeof(struct ieee80211_cts);
43 size = sizeof(struct ieee80211_rts);
45 skb = dev_alloc_skb(size + rt2x00dev->hw->extra_tx_headroom);
47 WARNING(rt2x00dev, "Failed to create RTS/CTS frame.\n");
48 return NETDEV_TX_BUSY;
51 skb_reserve(skb, rt2x00dev->hw->extra_tx_headroom);
54 if (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
55 ieee80211_ctstoself_get(rt2x00dev->hw, control->vif,
56 frag_skb->data, frag_skb->len, control,
57 (struct ieee80211_cts *)(skb->data));
59 ieee80211_rts_get(rt2x00dev->hw, control->vif,
60 frag_skb->data, frag_skb->len, control,
61 (struct ieee80211_rts *)(skb->data));
63 if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, queue, skb, control)) {
64 WARNING(rt2x00dev, "Failed to send RTS/CTS frame.\n");
65 return NETDEV_TX_BUSY;
71 int rt2x00mac_tx(struct ieee80211_hw *hw, struct sk_buff *skb,
72 struct ieee80211_tx_control *control)
74 struct rt2x00_dev *rt2x00dev = hw->priv;
75 struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data;
76 struct data_queue *queue;
80 * Mac80211 might be calling this function while we are trying
81 * to remove the device or perhaps suspending it.
82 * Note that we can only stop the TX queues inside the TX path
83 * due to possible race conditions in mac80211.
85 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags)) {
86 ieee80211_stop_queues(hw);
91 * Determine which queue to put packet on.
93 queue = rt2x00queue_get_queue(rt2x00dev, control->queue);
94 if (unlikely(!queue)) {
96 "Attempt to send packet over invalid queue %d.\n"
97 "Please file bug report to %s.\n",
98 control->queue, DRV_PROJECT);
99 dev_kfree_skb_any(skb);
104 * If CTS/RTS is required. and this frame is not CTS or RTS,
105 * create and queue that frame first. But make sure we have
106 * at least enough entries available to send this CTS/RTS
107 * frame as well as the data frame.
109 frame_control = le16_to_cpu(ieee80211hdr->frame_control);
110 if (!is_rts_frame(frame_control) && !is_cts_frame(frame_control) &&
111 (control->flags & (IEEE80211_TXCTL_USE_RTS_CTS |
112 IEEE80211_TXCTL_USE_CTS_PROTECT))) {
113 if (rt2x00queue_available(queue) <= 1) {
114 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
115 return NETDEV_TX_BUSY;
118 if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb, control)) {
119 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
120 return NETDEV_TX_BUSY;
124 if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, queue, skb, control)) {
125 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
126 return NETDEV_TX_BUSY;
129 if (rt2x00queue_full(queue))
130 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
132 if (rt2x00dev->ops->lib->kick_tx_queue)
133 rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);
137 EXPORT_SYMBOL_GPL(rt2x00mac_tx);
139 int rt2x00mac_start(struct ieee80211_hw *hw)
141 struct rt2x00_dev *rt2x00dev = hw->priv;
143 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
146 return rt2x00lib_start(rt2x00dev);
148 EXPORT_SYMBOL_GPL(rt2x00mac_start);
150 void rt2x00mac_stop(struct ieee80211_hw *hw)
152 struct rt2x00_dev *rt2x00dev = hw->priv;
154 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
157 rt2x00lib_stop(rt2x00dev);
159 EXPORT_SYMBOL_GPL(rt2x00mac_stop);
161 int rt2x00mac_add_interface(struct ieee80211_hw *hw,
162 struct ieee80211_if_init_conf *conf)
164 struct rt2x00_dev *rt2x00dev = hw->priv;
165 struct rt2x00_intf *intf = vif_to_intf(conf->vif);
166 struct data_queue *queue =
167 rt2x00queue_get_queue(rt2x00dev, RT2X00_BCN_QUEUE_BEACON);
168 struct queue_entry *entry = NULL;
172 * Don't allow interfaces to be added
173 * the device has disappeared.
175 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
176 !test_bit(DEVICE_STARTED, &rt2x00dev->flags))
180 * When we don't support mixed interfaces (a combination
181 * of sta and ap virtual interfaces) then we can only
182 * add this interface when the rival interface count is 0.
184 if (!test_bit(DRIVER_SUPPORT_MIXED_INTERFACES, &rt2x00dev->flags) &&
185 ((conf->type == IEEE80211_IF_TYPE_AP && rt2x00dev->intf_sta_count) ||
186 (conf->type != IEEE80211_IF_TYPE_AP && rt2x00dev->intf_ap_count)))
190 * Check if we exceeded the maximum amount of supported interfaces.
192 if ((conf->type == IEEE80211_IF_TYPE_AP &&
193 rt2x00dev->intf_ap_count >= rt2x00dev->ops->max_ap_intf) ||
194 (conf->type != IEEE80211_IF_TYPE_AP &&
195 rt2x00dev->intf_sta_count >= rt2x00dev->ops->max_sta_intf))
199 * Loop through all beacon queues to find a free
200 * entry. Since there are as much beacon entries
201 * as the maximum interfaces, this search shouldn't
204 for (i = 0; i < queue->limit; i++) {
205 entry = &queue->entries[i];
206 if (!__test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
210 if (unlikely(i == queue->limit))
214 * We are now absolutely sure the interface can be created,
215 * increase interface count and start initialization.
218 if (conf->type == IEEE80211_IF_TYPE_AP)
219 rt2x00dev->intf_ap_count++;
221 rt2x00dev->intf_sta_count++;
223 spin_lock_init(&intf->lock);
224 intf->beacon = entry;
226 if (conf->type == IEEE80211_IF_TYPE_AP)
227 memcpy(&intf->bssid, conf->mac_addr, ETH_ALEN);
228 memcpy(&intf->mac, conf->mac_addr, ETH_ALEN);
231 * The MAC adddress must be configured after the device
232 * has been initialized. Otherwise the device can reset
235 rt2x00lib_config_intf(rt2x00dev, intf, conf->type, intf->mac, NULL);
239 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
241 void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
242 struct ieee80211_if_init_conf *conf)
244 struct rt2x00_dev *rt2x00dev = hw->priv;
245 struct rt2x00_intf *intf = vif_to_intf(conf->vif);
248 * Don't allow interfaces to be remove while
249 * either the device has disappeared or when
250 * no interface is present.
252 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
253 (conf->type == IEEE80211_IF_TYPE_AP && !rt2x00dev->intf_ap_count) ||
254 (conf->type != IEEE80211_IF_TYPE_AP && !rt2x00dev->intf_sta_count))
257 if (conf->type == IEEE80211_IF_TYPE_AP)
258 rt2x00dev->intf_ap_count--;
260 rt2x00dev->intf_sta_count--;
263 * Release beacon entry so it is available for
264 * new interfaces again.
266 __clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);
269 * Make sure the bssid and mac address registers
270 * are cleared to prevent false ACKing of frames.
272 rt2x00lib_config_intf(rt2x00dev, intf,
273 IEEE80211_IF_TYPE_INVALID, NULL, NULL);
275 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
277 int rt2x00mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
279 struct rt2x00_dev *rt2x00dev = hw->priv;
282 * Mac80211 might be calling this function while we are trying
283 * to remove the device or perhaps suspending it.
285 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
289 * Check if we need to disable the radio,
290 * if this is not the case, at least the RX must be disabled.
292 if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags)) {
293 if (!conf->radio_enabled)
294 rt2x00lib_disable_radio(rt2x00dev);
296 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
299 rt2x00lib_config(rt2x00dev, conf, 0);
302 * Reenable RX only if the radio should be on.
304 if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
305 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
306 else if (conf->radio_enabled)
307 return rt2x00lib_enable_radio(rt2x00dev);
311 EXPORT_SYMBOL_GPL(rt2x00mac_config);
313 int rt2x00mac_config_interface(struct ieee80211_hw *hw,
314 struct ieee80211_vif *vif,
315 struct ieee80211_if_conf *conf)
317 struct rt2x00_dev *rt2x00dev = hw->priv;
318 struct rt2x00_intf *intf = vif_to_intf(vif);
322 * Mac80211 might be calling this function while we are trying
323 * to remove the device or perhaps suspending it.
325 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
328 spin_lock(&intf->lock);
331 * If the interface does not work in master mode,
332 * then the bssid value in the interface structure
335 if (conf->type != IEEE80211_IF_TYPE_AP)
336 memcpy(&intf->bssid, conf->bssid, ETH_ALEN);
337 rt2x00lib_config_intf(rt2x00dev, intf, conf->type, NULL, intf->bssid);
339 spin_unlock(&intf->lock);
342 * We only need to initialize the beacon when master mode is enabled.
344 if (conf->type != IEEE80211_IF_TYPE_AP || !conf->beacon)
347 status = rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw,
349 conf->beacon_control);
351 dev_kfree_skb(conf->beacon);
355 EXPORT_SYMBOL_GPL(rt2x00mac_config_interface);
357 int rt2x00mac_get_stats(struct ieee80211_hw *hw,
358 struct ieee80211_low_level_stats *stats)
360 struct rt2x00_dev *rt2x00dev = hw->priv;
363 * The dot11ACKFailureCount, dot11RTSFailureCount and
364 * dot11RTSSuccessCount are updated in interrupt time.
365 * dot11FCSErrorCount is updated in the link tuner.
367 memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
371 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
373 int rt2x00mac_get_tx_stats(struct ieee80211_hw *hw,
374 struct ieee80211_tx_queue_stats *stats)
376 struct rt2x00_dev *rt2x00dev = hw->priv;
379 for (i = 0; i < hw->queues; i++) {
380 stats->data[i].len = rt2x00dev->tx[i].length;
381 stats->data[i].limit = rt2x00dev->tx[i].limit;
382 stats->data[i].count = rt2x00dev->tx[i].count;
387 EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats);
389 void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
390 struct ieee80211_vif *vif,
391 struct ieee80211_bss_conf *bss_conf,
394 struct rt2x00_dev *rt2x00dev = hw->priv;
395 struct rt2x00_intf *intf = vif_to_intf(vif);
398 * When the association status has changed we must reset the link
399 * tuner counter. This is because some drivers determine if they
400 * should perform link tuning based on the number of seconds
401 * while associated or not associated.
403 if (changes & BSS_CHANGED_ASSOC) {
404 rt2x00dev->link.count = 0;
407 rt2x00dev->intf_associated++;
409 rt2x00dev->intf_associated--;
413 * When the preamble mode has changed, we should perform additional
414 * configuration steps. For all other changes we are already done.
416 if (changes & BSS_CHANGED_ERP_PREAMBLE) {
417 rt2x00lib_config_preamble(rt2x00dev, intf,
418 bss_conf->use_short_preamble);
420 spin_lock(&intf->lock);
421 memcpy(&intf->conf, bss_conf, sizeof(*bss_conf));
422 spin_unlock(&intf->lock);
425 EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
427 int rt2x00mac_conf_tx(struct ieee80211_hw *hw, int queue_idx,
428 const struct ieee80211_tx_queue_params *params)
430 struct rt2x00_dev *rt2x00dev = hw->priv;
431 struct data_queue *queue;
433 queue = rt2x00queue_get_queue(rt2x00dev, queue_idx);
434 if (unlikely(!queue))
438 * The passed variables are stored as real value ((2^n)-1).
439 * Ralink registers require to know the bit number 'n'.
441 if (params->cw_min > 0)
442 queue->cw_min = fls(params->cw_min);
444 queue->cw_min = 5; /* cw_min: 2^5 = 32. */
446 if (params->cw_max > 0)
447 queue->cw_max = fls(params->cw_max);
449 queue->cw_max = 10; /* cw_min: 2^10 = 1024. */
451 if (params->aifs >= 0)
452 queue->aifs = params->aifs;
457 "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d.\n",
458 queue_idx, queue->cw_min, queue->cw_max, queue->aifs);
462 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);