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
);