1 /*
2 Copyright (C) 2004 - 2007 rt2x00 SourceForge Project
3 <http://rt2x00.serialmonkey.com>
4
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.
9
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.
14
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.
19 */
20
21 /*
22 Module: rt2x00mac
23 Abstract: rt2x00 generic mac80211 routines.
24 */
25
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28
29 #include "rt2x00.h"
30 #include "rt2x00lib.h"
31
32 static int rt2x00mac_tx_rts_cts(struct rt2x00_dev *rt2x00dev,
33 struct data_ring *ring,
34 struct sk_buff *frag_skb,
35 struct ieee80211_tx_control *control)
36 {
37 struct sk_buff *skb;
38 int size;
39
40 if (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
41 size = sizeof(struct ieee80211_cts);
42 else
43 size = sizeof(struct ieee80211_rts);
44
45 skb = dev_alloc_skb(size + rt2x00dev->hw->extra_tx_headroom);
46 if (!skb) {
47 WARNING(rt2x00dev, "Failed to create RTS/CTS frame.\n");
48 return NETDEV_TX_BUSY;
49 }
50
51 skb_reserve(skb, rt2x00dev->hw->extra_tx_headroom);
52 skb_put(skb, size);
53
54 if (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
55 ieee80211_ctstoself_get(rt2x00dev->hw, rt2x00dev->interface.id,
56 frag_skb->data, frag_skb->len, control,
57 (struct ieee80211_cts *)(skb->data));
58 else
59 ieee80211_rts_get(rt2x00dev->hw, rt2x00dev->interface.id,
60 frag_skb->data, frag_skb->len, control,
61 (struct ieee80211_rts *)(skb->data));
62
63 if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, ring, skb, control)) {
64 WARNING(rt2x00dev, "Failed to send RTS/CTS frame.\n");
65 return NETDEV_TX_BUSY;
66 }
67
68 return NETDEV_TX_OK;
69 }
70
71 int rt2x00mac_tx(struct ieee80211_hw *hw, struct sk_buff *skb,
72 struct ieee80211_tx_control *control)
73 {
74 struct rt2x00_dev *rt2x00dev = hw->priv;
75 struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data;
76 struct data_ring *ring;
77 u16 frame_control;
78
79 /*
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.
84 */
85 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags)) {
86 ieee80211_stop_queues(hw);
87 return NETDEV_TX_OK;
88 }
89
90 /*
91 * Determine which ring to put packet on.
92 */
93 ring = rt2x00lib_get_ring(rt2x00dev, control->queue);
94 if (unlikely(!ring)) {
95 ERROR(rt2x00dev,
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);
100 return NETDEV_TX_OK;
101 }
102
103 /*
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.
108 */
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 (rt2x00_ring_free(ring) <= 1) {
114 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
115 return NETDEV_TX_BUSY;
116 }
117
118 if (rt2x00mac_tx_rts_cts(rt2x00dev, ring, skb, control)) {
119 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
120 return NETDEV_TX_BUSY;
121 }
122 }
123
124 if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, ring, skb, control)) {
125 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
126 return NETDEV_TX_BUSY;
127 }
128
129 if (rt2x00_ring_full(ring))
130 ieee80211_stop_queue(rt2x00dev->hw, control->queue);
131
132 if (rt2x00dev->ops->lib->kick_tx_queue)
133 rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);
134
135 return NETDEV_TX_OK;
136 }
137 EXPORT_SYMBOL_GPL(rt2x00mac_tx);
138
139 int rt2x00mac_start(struct ieee80211_hw *hw)
140 {
141 struct rt2x00_dev *rt2x00dev = hw->priv;
142
143 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
144 return 0;
145
146 return rt2x00lib_start(rt2x00dev);
147 }
148 EXPORT_SYMBOL_GPL(rt2x00mac_start);
149
150 void rt2x00mac_stop(struct ieee80211_hw *hw)
151 {
152 struct rt2x00_dev *rt2x00dev = hw->priv;
153
154 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
155 return;
156
157 rt2x00lib_stop(rt2x00dev);
158 }
159 EXPORT_SYMBOL_GPL(rt2x00mac_stop);
160
161 int rt2x00mac_add_interface(struct ieee80211_hw *hw,
162 struct ieee80211_if_init_conf *conf)
163 {
164 struct rt2x00_dev *rt2x00dev = hw->priv;
165 struct interface *intf = &rt2x00dev->interface;
166
167 /* FIXME: Beaconing is broken in rt2x00. */
168 if (conf->type == IEEE80211_IF_TYPE_IBSS ||
169 conf->type == IEEE80211_IF_TYPE_AP) {
170 ERROR(rt2x00dev,
171 "rt2x00 does not support Adhoc or Master mode");
172 return -EOPNOTSUPP;
173 }
174
175 /*
176 * Don't allow interfaces to be added while
177 * either the device has disappeared or when
178 * another interface is already present.
179 */
180 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
181 is_interface_present(intf))
182 return -ENOBUFS;
183
184 intf->id = conf->vif;
185 intf->type = conf->type;
186 if (conf->type == IEEE80211_IF_TYPE_AP)
187 memcpy(&intf->bssid, conf->mac_addr, ETH_ALEN);
188 memcpy(&intf->mac, conf->mac_addr, ETH_ALEN);
189
190 /*
191 * The MAC adddress must be configured after the device
192 * has been initialized. Otherwise the device can reset
193 * the MAC registers.
194 */
195 rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
196 rt2x00lib_config_type(rt2x00dev, conf->type);
197
198 return 0;
199 }
200 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
201
202 void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
203 struct ieee80211_if_init_conf *conf)
204 {
205 struct rt2x00_dev *rt2x00dev = hw->priv;
206 struct interface *intf = &rt2x00dev->interface;
207
208 /*
209 * Don't allow interfaces to be remove while
210 * either the device has disappeared or when
211 * no interface is present.
212 */
213 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
214 !is_interface_present(intf))
215 return;
216
217 intf->id = 0;
218 intf->type = IEEE80211_IF_TYPE_INVALID;
219 memset(&intf->bssid, 0x00, ETH_ALEN);
220 memset(&intf->mac, 0x00, ETH_ALEN);
221
222 /*
223 * Make sure the bssid and mac address registers
224 * are cleared to prevent false ACKing of frames.
225 */
226 rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
227 rt2x00lib_config_bssid(rt2x00dev, intf->bssid);
228 rt2x00lib_config_type(rt2x00dev, intf->type);
229 }
230 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
231
232 int rt2x00mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
233 {
234 struct rt2x00_dev *rt2x00dev = hw->priv;
235
236 /*
237 * Mac80211 might be calling this function while we are trying
238 * to remove the device or perhaps suspending it.
239 */
240 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
241 return 0;
242
243 /*
244 * Check if we need to disable the radio,
245 * if this is not the case, at least the RX must be disabled.
246 */
247 if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags)) {
248 if (!conf->radio_enabled)
249 rt2x00lib_disable_radio(rt2x00dev);
250 else
251 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
252 }
253
254 rt2x00lib_config(rt2x00dev, conf, 0);
255
256 /*
257 * Reenable RX only if the radio should be on.
258 */
259 if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
260 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
261 else if (conf->radio_enabled)
262 return rt2x00lib_enable_radio(rt2x00dev);
263
264 return 0;
265 }
266 EXPORT_SYMBOL_GPL(rt2x00mac_config);
267
268 int rt2x00mac_config_interface(struct ieee80211_hw *hw,
269 struct ieee80211_vif *vif,
270 struct ieee80211_if_conf *conf)
271 {
272 struct rt2x00_dev *rt2x00dev = hw->priv;
273 struct interface *intf = &rt2x00dev->interface;
274 int status;
275
276 /*
277 * Mac80211 might be calling this function while we are trying
278 * to remove the device or perhaps suspending it.
279 */
280 if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
281 return 0;
282
283 /*
284 * If the given type does not match the configured type,
285 * there has been a problem.
286 */
287 if (conf->type != intf->type)
288 return -EINVAL;
289
290 /*
291 * If the interface does not work in master mode,
292 * then the bssid value in the interface structure
293 * should now be set.
294 */
295 if (conf->type != IEEE80211_IF_TYPE_AP)
296 memcpy(&intf->bssid, conf->bssid, ETH_ALEN);
297 rt2x00lib_config_bssid(rt2x00dev, intf->bssid);
298
299 /*
300 * We only need to initialize the beacon when master mode is enabled.
301 */
302 if (conf->type != IEEE80211_IF_TYPE_AP || !conf->beacon)
303 return 0;
304
305 status = rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw,
306 conf->beacon,
307 conf->beacon_control);
308 if (status)
309 dev_kfree_skb(conf->beacon);
310
311 return status;
312 }
313 EXPORT_SYMBOL_GPL(rt2x00mac_config_interface);
314
315 int rt2x00mac_get_stats(struct ieee80211_hw *hw,
316 struct ieee80211_low_level_stats *stats)
317 {
318 struct rt2x00_dev *rt2x00dev = hw->priv;
319
320 /*
321 * The dot11ACKFailureCount, dot11RTSFailureCount and
322 * dot11RTSSuccessCount are updated in interrupt time.
323 * dot11FCSErrorCount is updated in the link tuner.
324 */
325 memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
326
327 return 0;
328 }
329 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
330
331 int rt2x00mac_get_tx_stats(struct ieee80211_hw *hw,
332 struct ieee80211_tx_queue_stats *stats)
333 {
334 struct rt2x00_dev *rt2x00dev = hw->priv;
335 unsigned int i;
336
337 for (i = 0; i < hw->queues; i++)
338 memcpy(&stats->data[i], &rt2x00dev->tx[i].stats,
339 sizeof(rt2x00dev->tx[i].stats));
340
341 return 0;
342 }
343 EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats);
344
345 void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
346 struct ieee80211_vif *vif,
347 struct ieee80211_bss_conf *bss_conf,
348 u32 changes)
349 {
350 struct rt2x00_dev *rt2x00dev = hw->priv;
351 int short_preamble;
352 int ack_timeout;
353 int ack_consume_time;
354 int difs;
355 int preamble;
356
357 /*
358 * We only support changing preamble mode.
359 */
360 if (!(changes & BSS_CHANGED_ERP_PREAMBLE))
361 return;
362
363 short_preamble = bss_conf->use_short_preamble;
364 preamble = bss_conf->use_short_preamble ?
365 SHORT_PREAMBLE : PREAMBLE;
366
367 difs = (hw->conf.flags & IEEE80211_CONF_SHORT_SLOT_TIME) ?
368 SHORT_DIFS : DIFS;
369 ack_timeout = difs + PLCP + preamble + get_duration(ACK_SIZE, 10);
370
371 ack_consume_time = SIFS + PLCP + preamble + get_duration(ACK_SIZE, 10);
372
373 if (short_preamble)
374 __set_bit(CONFIG_SHORT_PREAMBLE, &rt2x00dev->flags);
375 else
376 __clear_bit(CONFIG_SHORT_PREAMBLE, &rt2x00dev->flags);
377
378 rt2x00dev->ops->lib->config_preamble(rt2x00dev, short_preamble,
379 ack_timeout, ack_consume_time);
380 }
381 EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
382
383 int rt2x00mac_conf_tx(struct ieee80211_hw *hw, int queue,
384 const struct ieee80211_tx_queue_params *params)
385 {
386 struct rt2x00_dev *rt2x00dev = hw->priv;
387 struct data_ring *ring;
388
389 ring = rt2x00lib_get_ring(rt2x00dev, queue);
390 if (unlikely(!ring))
391 return -EINVAL;
392
393 /*
394 * The passed variables are stored as real value ((2^n)-1).
395 * Ralink registers require to know the bit number 'n'.
396 */
397 if (params->cw_min)
398 ring->tx_params.cw_min = fls(params->cw_min);
399 else
400 ring->tx_params.cw_min = 5; /* cw_min: 2^5 = 32. */
401
402 if (params->cw_max)
403 ring->tx_params.cw_max = fls(params->cw_max);
404 else
405 ring->tx_params.cw_max = 10; /* cw_min: 2^10 = 1024. */
406
407 if (params->aifs)
408 ring->tx_params.aifs = params->aifs;
409 else
410 ring->tx_params.aifs = 2;
411
412 INFO(rt2x00dev,
413 "Configured TX ring %d - CWmin: %d, CWmax: %d, Aifs: %d.\n",
414 queue, ring->tx_params.cw_min, ring->tx_params.cw_max,
415 ring->tx_params.aifs);
416
417 return 0;
418 }
419 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);
420
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