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 skb_frame_desc *skbdesc;
38 struct ieee80211_tx_info *rts_info;
42 if (tx_info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)
43 size = sizeof(struct ieee80211_cts);
45 size = sizeof(struct ieee80211_rts);
47 skb = dev_alloc_skb(size + rt2x00dev->hw->extra_tx_headroom);
49 WARNING(rt2x00dev, "Failed to create RTS/CTS frame.\n");
50 return NETDEV_TX_BUSY;
53 skb_reserve(skb, rt2x00dev->hw->extra_tx_headroom);
57 * Copy TX information over from original frame to
58 * RTS/CTS frame. Note that we set the no encryption flag
59 * since we don't want this frame to be encrypted.
60 * RTS frames should be acked, while CTS-to-self frames
61 * should not. The ready for TX flag is cleared to prevent
62 * it being automatically send when the descriptor is
63 * written to the hardware.
65 memcpy(skb->cb, frag_skb->cb, sizeof(skb->cb));
66 rts_info = IEEE80211_SKB_CB(skb);
67 rts_info->flags |= IEEE80211_TX_CTL_DO_NOT_ENCRYPT;
68 rts_info->flags &= ~IEEE80211_TX_CTL_USE_CTS_PROTECT;
69 rts_info->flags &= ~IEEE80211_TX_CTL_REQ_TX_STATUS;
71 if (tx_info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)
72 rts_info->flags |= IEEE80211_TX_CTL_NO_ACK;
74 rts_info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
76 if (tx_info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)
77 ieee80211_ctstoself_get(rt2x00dev->hw, tx_info->control.vif,
78 frag_skb->data, size, tx_info,
79 (struct ieee80211_cts *)(skb->data));
81 ieee80211_rts_get(rt2x00dev->hw, tx_info->control.vif,
82 frag_skb->data, size, tx_info,
83 (struct ieee80211_rts *)(skb->data));
86 * Initialize skb descriptor
88 skbdesc = get_skb_frame_desc(skb);
89 memset(skbdesc, 0, sizeof(*skbdesc));
90 skbdesc->flags |= FRAME_DESC_DRIVER_GENERATED;
92 if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, queue, skb)) {
93 WARNING(rt2x00dev, "Failed to send RTS/CTS frame.\n");
94 return NETDEV_TX_BUSY;
100 int rt2x00mac_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
102 struct rt2x00_dev *rt2x00dev = hw->priv;
103 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
104 struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data;
105 enum data_queue_qid qid = skb_get_queue_mapping(skb);
106 struct data_queue *queue;
110 * Mac80211 might be calling this function while we are trying
111 * to remove the device or perhaps suspending it.
112 * Note that we can only stop the TX queues inside the TX path
113 * due to possible race conditions in mac80211.
115 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags)) {
116 ieee80211_stop_queues(hw);
117 dev_kfree_skb_any(skb);
122 * Determine which queue to put packet on.
124 if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM &&
125 test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags))
126 queue = rt2x00queue_get_queue(rt2x00dev, QID_ATIM);
128 queue = rt2x00queue_get_queue(rt2x00dev, qid);
129 if (unlikely(!queue)) {
131 "Attempt to send packet over invalid queue %d.\n"
132 "Please file bug report to %s.\n", qid, DRV_PROJECT);
133 dev_kfree_skb_any(skb);
138 * If CTS/RTS is required. and this frame is not CTS or RTS,
139 * create and queue that frame first. But make sure we have
140 * at least enough entries available to send this CTS/RTS
141 * frame as well as the data frame.
142 * Note that when the driver has set the set_rts_threshold()
143 * callback function it doesn't need software generation of
144 * neither RTS or CTS-to-self frames and handles everything
145 * inside the hardware.
147 frame_control = le16_to_cpu(ieee80211hdr->frame_control);
148 if (!is_rts_frame(frame_control) && !is_cts_frame(frame_control) &&
149 (tx_info->flags & (IEEE80211_TX_CTL_USE_RTS_CTS |
150 IEEE80211_TX_CTL_USE_CTS_PROTECT)) &&
151 !rt2x00dev->ops->hw->set_rts_threshold) {
152 if (rt2x00queue_available(queue) <= 1) {
153 ieee80211_stop_queue(rt2x00dev->hw, qid);
154 return NETDEV_TX_BUSY;
157 if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb)) {
158 ieee80211_stop_queue(rt2x00dev->hw, qid);
159 return NETDEV_TX_BUSY;
163 if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, queue, skb)) {
164 ieee80211_stop_queue(rt2x00dev->hw, qid);
165 return NETDEV_TX_BUSY;
168 if (rt2x00queue_full(queue))
169 ieee80211_stop_queue(rt2x00dev->hw, qid);
171 if (rt2x00dev->ops->lib->kick_tx_queue)
172 rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, qid);
176 EXPORT_SYMBOL_GPL(rt2x00mac_tx);
178 int rt2x00mac_start(struct ieee80211_hw *hw)
180 struct rt2x00_dev *rt2x00dev = hw->priv;
182 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
185 return rt2x00lib_start(rt2x00dev);
187 EXPORT_SYMBOL_GPL(rt2x00mac_start);
189 void rt2x00mac_stop(struct ieee80211_hw *hw)
191 struct rt2x00_dev *rt2x00dev = hw->priv;
193 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
196 rt2x00lib_stop(rt2x00dev);
198 EXPORT_SYMBOL_GPL(rt2x00mac_stop);
200 int rt2x00mac_add_interface(struct ieee80211_hw *hw,
201 struct ieee80211_if_init_conf *conf)
203 struct rt2x00_dev *rt2x00dev = hw->priv;
204 struct rt2x00_intf *intf = vif_to_intf(conf->vif);
205 struct data_queue *queue = rt2x00queue_get_queue(rt2x00dev, QID_BEACON);
206 struct queue_entry *entry = NULL;
210 * Don't allow interfaces to be added
211 * the device has disappeared.
213 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
214 !test_bit(DEVICE_STARTED, &rt2x00dev->flags))
218 * We don't support mixed combinations of sta and ap virtual
219 * interfaces. We can only add this interface when the rival
220 * interface count is 0.
222 if ((conf->type == IEEE80211_IF_TYPE_AP && rt2x00dev->intf_sta_count) ||
223 (conf->type != IEEE80211_IF_TYPE_AP && rt2x00dev->intf_ap_count))
227 * Check if we exceeded the maximum amount of supported interfaces.
229 if ((conf->type == IEEE80211_IF_TYPE_AP &&
230 rt2x00dev->intf_ap_count >= rt2x00dev->ops->max_ap_intf) ||
231 (conf->type != IEEE80211_IF_TYPE_AP &&
232 rt2x00dev->intf_sta_count >= rt2x00dev->ops->max_sta_intf))
236 * Loop through all beacon queues to find a free
237 * entry. Since there are as much beacon entries
238 * as the maximum interfaces, this search shouldn't
241 for (i = 0; i < queue->limit; i++) {
242 entry = &queue->entries[i];
243 if (!__test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
247 if (unlikely(i == queue->limit))
251 * We are now absolutely sure the interface can be created,
252 * increase interface count and start initialization.
255 if (conf->type == IEEE80211_IF_TYPE_AP)
256 rt2x00dev->intf_ap_count++;
258 rt2x00dev->intf_sta_count++;
260 spin_lock_init(&intf->lock);
261 intf->beacon = entry;
263 if (conf->type == IEEE80211_IF_TYPE_AP)
264 memcpy(&intf->bssid, conf->mac_addr, ETH_ALEN);
265 memcpy(&intf->mac, conf->mac_addr, ETH_ALEN);
268 * The MAC adddress must be configured after the device
269 * has been initialized. Otherwise the device can reset
272 rt2x00lib_config_intf(rt2x00dev, intf, conf->type, intf->mac, NULL);
275 * Some filters depend on the current working mode. We can force
276 * an update during the next configure_filter() run by mac80211 by
277 * resetting the current packet_filter state.
279 rt2x00dev->packet_filter = 0;
283 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
285 void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
286 struct ieee80211_if_init_conf *conf)
288 struct rt2x00_dev *rt2x00dev = hw->priv;
289 struct rt2x00_intf *intf = vif_to_intf(conf->vif);
292 * Don't allow interfaces to be remove while
293 * either the device has disappeared or when
294 * no interface is present.
296 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
297 (conf->type == IEEE80211_IF_TYPE_AP && !rt2x00dev->intf_ap_count) ||
298 (conf->type != IEEE80211_IF_TYPE_AP && !rt2x00dev->intf_sta_count))
301 if (conf->type == IEEE80211_IF_TYPE_AP)
302 rt2x00dev->intf_ap_count--;
304 rt2x00dev->intf_sta_count--;
307 * Release beacon entry so it is available for
308 * new interfaces again.
310 __clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);
313 * Make sure the bssid and mac address registers
314 * are cleared to prevent false ACKing of frames.
316 rt2x00lib_config_intf(rt2x00dev, intf,
317 IEEE80211_IF_TYPE_INVALID, NULL, NULL);
319 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
321 int rt2x00mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
323 struct rt2x00_dev *rt2x00dev = hw->priv;
326 * Mac80211 might be calling this function while we are trying
327 * to remove the device or perhaps suspending it.
329 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
333 * Check if we need to disable the radio,
334 * if this is not the case, at least the RX must be disabled.
336 if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags)) {
337 if (!conf->radio_enabled)
338 rt2x00lib_disable_radio(rt2x00dev);
340 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
343 rt2x00lib_config(rt2x00dev, conf, 0);
346 * Reenable RX only if the radio should be on.
348 if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
349 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
350 else if (conf->radio_enabled)
351 return rt2x00lib_enable_radio(rt2x00dev);
355 EXPORT_SYMBOL_GPL(rt2x00mac_config);
357 int rt2x00mac_config_interface(struct ieee80211_hw *hw,
358 struct ieee80211_vif *vif,
359 struct ieee80211_if_conf *conf)
361 struct rt2x00_dev *rt2x00dev = hw->priv;
362 struct rt2x00_intf *intf = vif_to_intf(vif);
366 * Mac80211 might be calling this function while we are trying
367 * to remove the device or perhaps suspending it.
369 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
372 spin_lock(&intf->lock);
375 * If the interface does not work in master mode,
376 * then the bssid value in the interface structure
379 if (conf->type != IEEE80211_IF_TYPE_AP)
380 memcpy(&intf->bssid, conf->bssid, ETH_ALEN);
382 spin_unlock(&intf->lock);
385 * Call rt2x00_config_intf() outside of the spinlock context since
386 * the call will sleep for USB drivers. By using the ieee80211_if_conf
387 * values as arguments we make keep access to rt2x00_intf thread safe
388 * even without the lock.
390 rt2x00lib_config_intf(rt2x00dev, intf, conf->type, NULL, conf->bssid);
393 * We only need to initialize the beacon when master mode is enabled.
395 if (conf->type != IEEE80211_IF_TYPE_AP || !conf->beacon)
398 status = rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw, conf->beacon);
400 dev_kfree_skb(conf->beacon);
404 EXPORT_SYMBOL_GPL(rt2x00mac_config_interface);
406 void rt2x00mac_configure_filter(struct ieee80211_hw *hw,
407 unsigned int changed_flags,
408 unsigned int *total_flags,
409 int mc_count, struct dev_addr_list *mc_list)
411 struct rt2x00_dev *rt2x00dev = hw->priv;
414 * Mask off any flags we are going to ignore
415 * from the total_flags field.
426 * Apply some rules to the filters:
427 * - Some filters imply different filters to be set.
428 * - Some things we can't filter out at all.
429 * - Multicast filter seems to kill broadcast traffic so never use it.
431 *total_flags |= FIF_ALLMULTI;
432 if (*total_flags & FIF_OTHER_BSS ||
433 *total_flags & FIF_PROMISC_IN_BSS)
434 *total_flags |= FIF_PROMISC_IN_BSS | FIF_OTHER_BSS;
437 * Check if there is any work left for us.
439 if (rt2x00dev->packet_filter == *total_flags)
441 rt2x00dev->packet_filter = *total_flags;
443 if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags))
444 rt2x00dev->ops->lib->config_filter(rt2x00dev, *total_flags);
446 queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->filter_work);
448 EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter);
450 int rt2x00mac_get_stats(struct ieee80211_hw *hw,
451 struct ieee80211_low_level_stats *stats)
453 struct rt2x00_dev *rt2x00dev = hw->priv;
456 * The dot11ACKFailureCount, dot11RTSFailureCount and
457 * dot11RTSSuccessCount are updated in interrupt time.
458 * dot11FCSErrorCount is updated in the link tuner.
460 memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
464 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
466 int rt2x00mac_get_tx_stats(struct ieee80211_hw *hw,
467 struct ieee80211_tx_queue_stats *stats)
469 struct rt2x00_dev *rt2x00dev = hw->priv;
472 for (i = 0; i < rt2x00dev->ops->tx_queues; i++) {
473 stats[i].len = rt2x00dev->tx[i].length;
474 stats[i].limit = rt2x00dev->tx[i].limit;
475 stats[i].count = rt2x00dev->tx[i].count;
480 EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats);
482 void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
483 struct ieee80211_vif *vif,
484 struct ieee80211_bss_conf *bss_conf,
487 struct rt2x00_dev *rt2x00dev = hw->priv;
488 struct rt2x00_intf *intf = vif_to_intf(vif);
489 unsigned int delayed = 0;
492 * When the association status has changed we must reset the link
493 * tuner counter. This is because some drivers determine if they
494 * should perform link tuning based on the number of seconds
495 * while associated or not associated.
497 if (changes & BSS_CHANGED_ASSOC) {
498 rt2x00dev->link.count = 0;
501 rt2x00dev->intf_associated++;
503 rt2x00dev->intf_associated--;
505 if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags))
506 rt2x00leds_led_assoc(rt2x00dev,
507 !!rt2x00dev->intf_associated);
509 delayed |= DELAYED_LED_ASSOC;
513 * When the erp information has changed, we should perform
514 * additional configuration steps. For all other changes we are done.
516 if (changes & BSS_CHANGED_ERP_PREAMBLE) {
517 if (!test_bit(DRIVER_REQUIRE_SCHEDULED, &rt2x00dev->flags))
518 rt2x00lib_config_erp(rt2x00dev, intf, bss_conf);
520 delayed |= DELAYED_CONFIG_ERP;
523 spin_lock(&intf->lock);
524 memcpy(&intf->conf, bss_conf, sizeof(*bss_conf));
526 intf->delayed_flags |= delayed;
527 queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->intf_work);
529 spin_unlock(&intf->lock);
531 EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
533 int rt2x00mac_conf_tx(struct ieee80211_hw *hw, u16 queue_idx,
534 const struct ieee80211_tx_queue_params *params)
536 struct rt2x00_dev *rt2x00dev = hw->priv;
537 struct data_queue *queue;
539 queue = rt2x00queue_get_queue(rt2x00dev, queue_idx);
540 if (unlikely(!queue))
544 * The passed variables are stored as real value ((2^n)-1).
545 * Ralink registers require to know the bit number 'n'.
547 if (params->cw_min > 0)
548 queue->cw_min = fls(params->cw_min);
550 queue->cw_min = 5; /* cw_min: 2^5 = 32. */
552 if (params->cw_max > 0)
553 queue->cw_max = fls(params->cw_max);
555 queue->cw_max = 10; /* cw_min: 2^10 = 1024. */
557 if (params->aifs >= 0)
558 queue->aifs = params->aifs;
563 "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d.\n",
564 queue_idx, queue->cw_min, queue->cw_max, queue->aifs);
568 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);