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 enum data_queue_qid qid = mac80211_queue_to_qid(control->queue);
85 struct data_queue *queue;
86 struct skb_frame_desc *skbdesc;
90 * Mac80211 might be calling this function while we are trying
91 * to remove the device or perhaps suspending it.
92 * Note that we can only stop the TX queues inside the TX path
93 * due to possible race conditions in mac80211.
95 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags)) {
96 ieee80211_stop_queues(hw);
101 * Determine which queue to put packet on.
103 if (control->flags & IEEE80211_TXCTL_SEND_AFTER_DTIM &&
104 test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags))
105 queue = rt2x00queue_get_queue(rt2x00dev, QID_ATIM);
107 queue = rt2x00queue_get_queue(rt2x00dev, qid);
108 if (unlikely(!queue)) {
110 "Attempt to send packet over invalid queue %d.\n"
111 "Please file bug report to %s.\n", qid, 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, qid);
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 = rt2x00queue_get_queue(rt2x00dev, QID_BEACON);
191 struct queue_entry *entry = NULL;
195 * Don't allow interfaces to be added
196 * the device has disappeared.
198 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
199 !test_bit(DEVICE_STARTED, &rt2x00dev->flags))
203 * We don't support mixed combinations of sta and ap virtual
204 * interfaces. We can only add this interface when the rival
205 * interface count is 0.
207 if ((conf->type == IEEE80211_IF_TYPE_AP && rt2x00dev->intf_sta_count) ||
208 (conf->type != IEEE80211_IF_TYPE_AP && rt2x00dev->intf_ap_count))
212 * Check if we exceeded the maximum amount of supported interfaces.
214 if ((conf->type == IEEE80211_IF_TYPE_AP &&
215 rt2x00dev->intf_ap_count >= rt2x00dev->ops->max_ap_intf) ||
216 (conf->type != IEEE80211_IF_TYPE_AP &&
217 rt2x00dev->intf_sta_count >= rt2x00dev->ops->max_sta_intf))
221 * Loop through all beacon queues to find a free
222 * entry. Since there are as much beacon entries
223 * as the maximum interfaces, this search shouldn't
226 for (i = 0; i < queue->limit; i++) {
227 entry = &queue->entries[i];
228 if (!__test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
232 if (unlikely(i == queue->limit))
236 * We are now absolutely sure the interface can be created,
237 * increase interface count and start initialization.
240 if (conf->type == IEEE80211_IF_TYPE_AP)
241 rt2x00dev->intf_ap_count++;
243 rt2x00dev->intf_sta_count++;
245 spin_lock_init(&intf->lock);
246 intf->beacon = entry;
248 if (conf->type == IEEE80211_IF_TYPE_AP)
249 memcpy(&intf->bssid, conf->mac_addr, ETH_ALEN);
250 memcpy(&intf->mac, conf->mac_addr, ETH_ALEN);
253 * The MAC adddress must be configured after the device
254 * has been initialized. Otherwise the device can reset
257 rt2x00lib_config_intf(rt2x00dev, intf, conf->type, intf->mac, NULL);
260 * Some filters depend on the current working mode. We can force
261 * an update during the next configure_filter() run by mac80211 by
262 * resetting the current packet_filter state.
264 rt2x00dev->packet_filter = 0;
268 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
270 void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
271 struct ieee80211_if_init_conf *conf)
273 struct rt2x00_dev *rt2x00dev = hw->priv;
274 struct rt2x00_intf *intf = vif_to_intf(conf->vif);
277 * Don't allow interfaces to be remove while
278 * either the device has disappeared or when
279 * no interface is present.
281 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
282 (conf->type == IEEE80211_IF_TYPE_AP && !rt2x00dev->intf_ap_count) ||
283 (conf->type != IEEE80211_IF_TYPE_AP && !rt2x00dev->intf_sta_count))
286 if (conf->type == IEEE80211_IF_TYPE_AP)
287 rt2x00dev->intf_ap_count--;
289 rt2x00dev->intf_sta_count--;
292 * Release beacon entry so it is available for
293 * new interfaces again.
295 __clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);
298 * Make sure the bssid and mac address registers
299 * are cleared to prevent false ACKing of frames.
301 rt2x00lib_config_intf(rt2x00dev, intf,
302 IEEE80211_IF_TYPE_INVALID, NULL, NULL);
304 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
306 int rt2x00mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
308 struct rt2x00_dev *rt2x00dev = hw->priv;
311 * Mac80211 might be calling this function while we are trying
312 * to remove the device or perhaps suspending it.
314 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
318 * Check if we need to disable the radio,
319 * if this is not the case, at least the RX must be disabled.
321 if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags)) {
322 if (!conf->radio_enabled)
323 rt2x00lib_disable_radio(rt2x00dev);
325 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
328 rt2x00lib_config(rt2x00dev, conf, 0);
331 * Reenable RX only if the radio should be on.
333 if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
334 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
335 else if (conf->radio_enabled)
336 return rt2x00lib_enable_radio(rt2x00dev);
340 EXPORT_SYMBOL_GPL(rt2x00mac_config);
342 int rt2x00mac_config_interface(struct ieee80211_hw *hw,
343 struct ieee80211_vif *vif,
344 struct ieee80211_if_conf *conf)
346 struct rt2x00_dev *rt2x00dev = hw->priv;
347 struct rt2x00_intf *intf = vif_to_intf(vif);
351 * Mac80211 might be calling this function while we are trying
352 * to remove the device or perhaps suspending it.
354 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
357 spin_lock(&intf->lock);
360 * If the interface does not work in master mode,
361 * then the bssid value in the interface structure
364 if (conf->type != IEEE80211_IF_TYPE_AP)
365 memcpy(&intf->bssid, conf->bssid, ETH_ALEN);
367 spin_unlock(&intf->lock);
370 * Call rt2x00_config_intf() outside of the spinlock context since
371 * the call will sleep for USB drivers. By using the ieee80211_if_conf
372 * values as arguments we make keep access to rt2x00_intf thread safe
373 * even without the lock.
375 rt2x00lib_config_intf(rt2x00dev, intf, conf->type, NULL, conf->bssid);
378 * We only need to initialize the beacon when master mode is enabled.
380 if (conf->type != IEEE80211_IF_TYPE_AP || !conf->beacon)
383 status = rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw,
385 conf->beacon_control);
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 < hw->queues; i++) {
460 stats->data[i].len = rt2x00dev->tx[i].length;
461 stats->data[i].limit = rt2x00dev->tx[i].limit;
462 stats->data[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, int 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);