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95ea3627 ID |
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 | ||
95ea3627 ID |
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 | ||
066cb637 ID |
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); | |
1230cb83 | 87 | return NETDEV_TX_OK; |
066cb637 ID |
88 | } |
89 | ||
95ea3627 ID |
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))) { | |
1230cb83 ID |
113 | if (rt2x00_ring_free(ring) <= 1) { |
114 | ieee80211_stop_queue(rt2x00dev->hw, control->queue); | |
95ea3627 | 115 | return NETDEV_TX_BUSY; |
1230cb83 | 116 | } |
95ea3627 | 117 | |
1230cb83 ID |
118 | if (rt2x00mac_tx_rts_cts(rt2x00dev, ring, skb, control)) { |
119 | ieee80211_stop_queue(rt2x00dev->hw, control->queue); | |
95ea3627 | 120 | return NETDEV_TX_BUSY; |
1230cb83 | 121 | } |
95ea3627 ID |
122 | } |
123 | ||
1230cb83 ID |
124 | if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, ring, skb, control)) { |
125 | ieee80211_stop_queue(rt2x00dev->hw, control->queue); | |
95ea3627 | 126 | return NETDEV_TX_BUSY; |
1230cb83 ID |
127 | } |
128 | ||
129 | if (rt2x00_ring_full(ring)) | |
130 | ieee80211_stop_queue(rt2x00dev->hw, control->queue); | |
95ea3627 ID |
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 | int status; | |
143 | ||
066cb637 ID |
144 | if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) || |
145 | test_bit(DEVICE_STARTED, &rt2x00dev->flags)) | |
95ea3627 ID |
146 | return 0; |
147 | ||
148 | /* | |
149 | * If this is the first interface which is added, | |
150 | * we should load the firmware now. | |
151 | */ | |
066cb637 | 152 | if (test_bit(DRIVER_REQUIRE_FIRMWARE, &rt2x00dev->flags)) { |
95ea3627 ID |
153 | status = rt2x00lib_load_firmware(rt2x00dev); |
154 | if (status) | |
155 | return status; | |
156 | } | |
157 | ||
158 | /* | |
159 | * Initialize the device. | |
160 | */ | |
161 | status = rt2x00lib_initialize(rt2x00dev); | |
162 | if (status) | |
163 | return status; | |
164 | ||
165 | /* | |
166 | * Enable radio. | |
167 | */ | |
168 | status = rt2x00lib_enable_radio(rt2x00dev); | |
169 | if (status) { | |
170 | rt2x00lib_uninitialize(rt2x00dev); | |
171 | return status; | |
172 | } | |
173 | ||
066cb637 ID |
174 | __set_bit(DEVICE_STARTED, &rt2x00dev->flags); |
175 | ||
95ea3627 ID |
176 | return 0; |
177 | } | |
178 | EXPORT_SYMBOL_GPL(rt2x00mac_start); | |
179 | ||
180 | void rt2x00mac_stop(struct ieee80211_hw *hw) | |
181 | { | |
182 | struct rt2x00_dev *rt2x00dev = hw->priv; | |
183 | ||
066cb637 ID |
184 | if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags)) |
185 | return; | |
186 | ||
95ea3627 ID |
187 | /* |
188 | * Perhaps we can add something smarter here, | |
189 | * but for now just disabling the radio should do. | |
190 | */ | |
191 | rt2x00lib_disable_radio(rt2x00dev); | |
066cb637 ID |
192 | |
193 | __clear_bit(DEVICE_STARTED, &rt2x00dev->flags); | |
95ea3627 ID |
194 | } |
195 | EXPORT_SYMBOL_GPL(rt2x00mac_stop); | |
196 | ||
197 | int rt2x00mac_add_interface(struct ieee80211_hw *hw, | |
198 | struct ieee80211_if_init_conf *conf) | |
199 | { | |
200 | struct rt2x00_dev *rt2x00dev = hw->priv; | |
201 | struct interface *intf = &rt2x00dev->interface; | |
95ea3627 | 202 | |
453a3fb9 ID |
203 | /* FIXME: Beaconing is broken in rt2x00. */ |
204 | if (conf->type == IEEE80211_IF_TYPE_IBSS || | |
205 | conf->type == IEEE80211_IF_TYPE_AP) { | |
206 | ERROR(rt2x00dev, | |
207 | "rt2x00 does not support Adhoc or Master mode"); | |
208 | return -EOPNOTSUPP; | |
209 | } | |
210 | ||
95ea3627 | 211 | /* |
066cb637 ID |
212 | * Don't allow interfaces to be added while |
213 | * either the device has disappeared or when | |
214 | * another interface is already present. | |
95ea3627 | 215 | */ |
066cb637 ID |
216 | if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) || |
217 | is_interface_present(intf)) | |
95ea3627 ID |
218 | return -ENOBUFS; |
219 | ||
4150c572 JB |
220 | intf->id = conf->if_id; |
221 | intf->type = conf->type; | |
222 | if (conf->type == IEEE80211_IF_TYPE_AP) | |
223 | memcpy(&intf->bssid, conf->mac_addr, ETH_ALEN); | |
224 | memcpy(&intf->mac, conf->mac_addr, ETH_ALEN); | |
95ea3627 ID |
225 | |
226 | /* | |
95ea3627 | 227 | * The MAC adddress must be configured after the device |
4150c572 JB |
228 | * has been initialized. Otherwise the device can reset |
229 | * the MAC registers. | |
95ea3627 ID |
230 | */ |
231 | rt2x00lib_config_mac_addr(rt2x00dev, intf->mac); | |
232 | rt2x00lib_config_type(rt2x00dev, conf->type); | |
95ea3627 ID |
233 | |
234 | return 0; | |
235 | } | |
236 | EXPORT_SYMBOL_GPL(rt2x00mac_add_interface); | |
237 | ||
238 | void rt2x00mac_remove_interface(struct ieee80211_hw *hw, | |
239 | struct ieee80211_if_init_conf *conf) | |
240 | { | |
241 | struct rt2x00_dev *rt2x00dev = hw->priv; | |
242 | struct interface *intf = &rt2x00dev->interface; | |
243 | ||
244 | /* | |
066cb637 ID |
245 | * Don't allow interfaces to be remove while |
246 | * either the device has disappeared or when | |
247 | * no interface is present. | |
95ea3627 | 248 | */ |
066cb637 ID |
249 | if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) || |
250 | !is_interface_present(intf)) | |
95ea3627 ID |
251 | return; |
252 | ||
4150c572 | 253 | intf->id = 0; |
d28c2561 | 254 | intf->type = IEEE80211_IF_TYPE_INVALID; |
4150c572 JB |
255 | memset(&intf->bssid, 0x00, ETH_ALEN); |
256 | memset(&intf->mac, 0x00, ETH_ALEN); | |
95ea3627 ID |
257 | |
258 | /* | |
259 | * Make sure the bssid and mac address registers | |
260 | * are cleared to prevent false ACKing of frames. | |
261 | */ | |
262 | rt2x00lib_config_mac_addr(rt2x00dev, intf->mac); | |
263 | rt2x00lib_config_bssid(rt2x00dev, intf->bssid); | |
264 | rt2x00lib_config_type(rt2x00dev, intf->type); | |
95ea3627 ID |
265 | } |
266 | EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface); | |
267 | ||
268 | int rt2x00mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf) | |
269 | { | |
270 | struct rt2x00_dev *rt2x00dev = hw->priv; | |
271 | ||
272 | /* | |
066cb637 ID |
273 | * Mac80211 might be calling this function while we are trying |
274 | * to remove the device or perhaps suspending it. | |
95ea3627 | 275 | */ |
066cb637 | 276 | if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags)) |
95ea3627 ID |
277 | return 0; |
278 | ||
279 | /* | |
280 | * Check if we need to disable the radio, | |
281 | * if this is not the case, at least the RX must be disabled. | |
282 | */ | |
283 | if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags)) { | |
284 | if (!conf->radio_enabled) | |
285 | rt2x00lib_disable_radio(rt2x00dev); | |
286 | else | |
5cbf830e | 287 | rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF); |
95ea3627 ID |
288 | } |
289 | ||
066cb637 | 290 | rt2x00lib_config(rt2x00dev, conf, 0); |
95ea3627 | 291 | |
95ea3627 ID |
292 | /* |
293 | * Reenable RX only if the radio should be on. | |
294 | */ | |
295 | if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags)) | |
5cbf830e | 296 | rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON); |
95ea3627 ID |
297 | else if (conf->radio_enabled) |
298 | return rt2x00lib_enable_radio(rt2x00dev); | |
299 | ||
300 | return 0; | |
301 | } | |
302 | EXPORT_SYMBOL_GPL(rt2x00mac_config); | |
303 | ||
304 | int rt2x00mac_config_interface(struct ieee80211_hw *hw, int if_id, | |
305 | struct ieee80211_if_conf *conf) | |
306 | { | |
307 | struct rt2x00_dev *rt2x00dev = hw->priv; | |
308 | struct interface *intf = &rt2x00dev->interface; | |
309 | int status; | |
310 | ||
311 | /* | |
066cb637 ID |
312 | * Mac80211 might be calling this function while we are trying |
313 | * to remove the device or perhaps suspending it. | |
95ea3627 | 314 | */ |
066cb637 | 315 | if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags)) |
95ea3627 ID |
316 | return 0; |
317 | ||
318 | /* | |
95ea3627 ID |
319 | * If the given type does not match the configured type, |
320 | * there has been a problem. | |
321 | */ | |
4150c572 | 322 | if (conf->type != intf->type) |
95ea3627 ID |
323 | return -EINVAL; |
324 | ||
325 | /* | |
326 | * If the interface does not work in master mode, | |
327 | * then the bssid value in the interface structure | |
328 | * should now be set. | |
329 | */ | |
330 | if (conf->type != IEEE80211_IF_TYPE_AP) | |
331 | memcpy(&intf->bssid, conf->bssid, ETH_ALEN); | |
332 | rt2x00lib_config_bssid(rt2x00dev, intf->bssid); | |
333 | ||
334 | /* | |
335 | * We only need to initialize the beacon when master mode is enabled. | |
336 | */ | |
337 | if (conf->type != IEEE80211_IF_TYPE_AP || !conf->beacon) | |
338 | return 0; | |
339 | ||
340 | status = rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw, | |
341 | conf->beacon, | |
342 | conf->beacon_control); | |
343 | if (status) | |
344 | dev_kfree_skb(conf->beacon); | |
345 | ||
346 | return status; | |
347 | } | |
348 | EXPORT_SYMBOL_GPL(rt2x00mac_config_interface); | |
349 | ||
95ea3627 ID |
350 | int rt2x00mac_get_stats(struct ieee80211_hw *hw, |
351 | struct ieee80211_low_level_stats *stats) | |
352 | { | |
353 | struct rt2x00_dev *rt2x00dev = hw->priv; | |
354 | ||
355 | /* | |
356 | * The dot11ACKFailureCount, dot11RTSFailureCount and | |
357 | * dot11RTSSuccessCount are updated in interrupt time. | |
358 | * dot11FCSErrorCount is updated in the link tuner. | |
359 | */ | |
360 | memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats)); | |
361 | ||
362 | return 0; | |
363 | } | |
364 | EXPORT_SYMBOL_GPL(rt2x00mac_get_stats); | |
365 | ||
366 | int rt2x00mac_get_tx_stats(struct ieee80211_hw *hw, | |
367 | struct ieee80211_tx_queue_stats *stats) | |
368 | { | |
369 | struct rt2x00_dev *rt2x00dev = hw->priv; | |
370 | unsigned int i; | |
371 | ||
372 | for (i = 0; i < hw->queues; i++) | |
373 | memcpy(&stats->data[i], &rt2x00dev->tx[i].stats, | |
374 | sizeof(rt2x00dev->tx[i].stats)); | |
375 | ||
376 | return 0; | |
377 | } | |
378 | EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats); | |
379 | ||
5c58ee51 ID |
380 | void rt2x00mac_erp_ie_changed(struct ieee80211_hw *hw, u8 changes, |
381 | int cts_protection, int preamble) | |
382 | { | |
383 | struct rt2x00_dev *rt2x00dev = hw->priv; | |
384 | int short_preamble; | |
385 | int ack_timeout; | |
386 | int ack_consume_time; | |
387 | int difs; | |
388 | ||
389 | /* | |
390 | * We only support changing preamble mode. | |
391 | */ | |
392 | if (!(changes & IEEE80211_ERP_CHANGE_PREAMBLE)) | |
393 | return; | |
394 | ||
395 | short_preamble = !preamble; | |
396 | preamble = !!(preamble) ? PREAMBLE : SHORT_PREAMBLE; | |
397 | ||
398 | difs = (hw->conf.flags & IEEE80211_CONF_SHORT_SLOT_TIME) ? | |
399 | SHORT_DIFS : DIFS; | |
400 | ack_timeout = difs + PLCP + preamble + get_duration(ACK_SIZE, 10); | |
401 | ||
402 | ack_consume_time = SIFS + PLCP + preamble + get_duration(ACK_SIZE, 10); | |
403 | ||
404 | if (short_preamble) | |
405 | __set_bit(CONFIG_SHORT_PREAMBLE, &rt2x00dev->flags); | |
406 | else | |
407 | __clear_bit(CONFIG_SHORT_PREAMBLE, &rt2x00dev->flags); | |
408 | ||
409 | rt2x00dev->ops->lib->config_preamble(rt2x00dev, short_preamble, | |
410 | ack_timeout, ack_consume_time); | |
411 | } | |
412 | EXPORT_SYMBOL_GPL(rt2x00mac_erp_ie_changed); | |
413 | ||
95ea3627 ID |
414 | int rt2x00mac_conf_tx(struct ieee80211_hw *hw, int queue, |
415 | const struct ieee80211_tx_queue_params *params) | |
416 | { | |
417 | struct rt2x00_dev *rt2x00dev = hw->priv; | |
418 | struct data_ring *ring; | |
419 | ||
420 | ring = rt2x00lib_get_ring(rt2x00dev, queue); | |
421 | if (unlikely(!ring)) | |
422 | return -EINVAL; | |
423 | ||
424 | /* | |
425 | * The passed variables are stored as real value ((2^n)-1). | |
426 | * Ralink registers require to know the bit number 'n'. | |
427 | */ | |
428 | if (params->cw_min) | |
429 | ring->tx_params.cw_min = fls(params->cw_min); | |
430 | else | |
431 | ring->tx_params.cw_min = 5; /* cw_min: 2^5 = 32. */ | |
432 | ||
433 | if (params->cw_max) | |
434 | ring->tx_params.cw_max = fls(params->cw_max); | |
435 | else | |
436 | ring->tx_params.cw_max = 10; /* cw_min: 2^10 = 1024. */ | |
437 | ||
438 | if (params->aifs) | |
439 | ring->tx_params.aifs = params->aifs; | |
440 | else | |
441 | ring->tx_params.aifs = 2; | |
442 | ||
443 | INFO(rt2x00dev, | |
444 | "Configured TX ring %d - CWmin: %d, CWmax: %d, Aifs: %d.\n", | |
445 | queue, ring->tx_params.cw_min, ring->tx_params.cw_max, | |
446 | ring->tx_params.aifs); | |
447 | ||
448 | return 0; | |
449 | } | |
450 | EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx); |