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
= mac80211_queue_to_qid(tx_info
->queue
);
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
);
121 * Determine which queue to put packet on.
123 if (tx_info
->flags
& IEEE80211_TX_CTL_SEND_AFTER_DTIM
&&
124 test_bit(DRIVER_REQUIRE_ATIM_QUEUE
, &rt2x00dev
->flags
))
125 queue
= rt2x00queue_get_queue(rt2x00dev
, QID_ATIM
);
127 queue
= rt2x00queue_get_queue(rt2x00dev
, qid
);
128 if (unlikely(!queue
)) {
130 "Attempt to send packet over invalid queue %d.\n"
131 "Please file bug report to %s.\n", qid
, DRV_PROJECT
);
132 dev_kfree_skb_any(skb
);
137 * If CTS/RTS is required. and this frame is not CTS or RTS,
138 * create and queue that frame first. But make sure we have
139 * at least enough entries available to send this CTS/RTS
140 * frame as well as the data frame.
141 * Note that when the driver has set the set_rts_threshold()
142 * callback function it doesn't need software generation of
143 * neither RTS or CTS-to-self frames and handles everything
144 * inside the hardware.
146 frame_control
= le16_to_cpu(ieee80211hdr
->frame_control
);
147 if (!is_rts_frame(frame_control
) && !is_cts_frame(frame_control
) &&
148 (tx_info
->flags
& (IEEE80211_TX_CTL_USE_RTS_CTS
|
149 IEEE80211_TX_CTL_USE_CTS_PROTECT
)) &&
150 !rt2x00dev
->ops
->hw
->set_rts_threshold
) {
151 if (rt2x00queue_available(queue
) <= 1) {
152 ieee80211_stop_queue(rt2x00dev
->hw
, tx_info
->queue
);
153 return NETDEV_TX_BUSY
;
156 if (rt2x00mac_tx_rts_cts(rt2x00dev
, queue
, skb
)) {
157 ieee80211_stop_queue(rt2x00dev
->hw
, tx_info
->queue
);
158 return NETDEV_TX_BUSY
;
162 if (rt2x00dev
->ops
->lib
->write_tx_data(rt2x00dev
, queue
, skb
)) {
163 ieee80211_stop_queue(rt2x00dev
->hw
, tx_info
->queue
);
164 return NETDEV_TX_BUSY
;
167 if (rt2x00queue_full(queue
))
168 ieee80211_stop_queue(rt2x00dev
->hw
, tx_info
->queue
);
170 if (rt2x00dev
->ops
->lib
->kick_tx_queue
)
171 rt2x00dev
->ops
->lib
->kick_tx_queue(rt2x00dev
, qid
);
175 EXPORT_SYMBOL_GPL(rt2x00mac_tx
);
177 int rt2x00mac_start(struct ieee80211_hw
*hw
)
179 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
181 if (!test_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
))
184 return rt2x00lib_start(rt2x00dev
);
186 EXPORT_SYMBOL_GPL(rt2x00mac_start
);
188 void rt2x00mac_stop(struct ieee80211_hw
*hw
)
190 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
192 if (!test_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
))
195 rt2x00lib_stop(rt2x00dev
);
197 EXPORT_SYMBOL_GPL(rt2x00mac_stop
);
199 int rt2x00mac_add_interface(struct ieee80211_hw
*hw
,
200 struct ieee80211_if_init_conf
*conf
)
202 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
203 struct rt2x00_intf
*intf
= vif_to_intf(conf
->vif
);
204 struct data_queue
*queue
= rt2x00queue_get_queue(rt2x00dev
, QID_BEACON
);
205 struct queue_entry
*entry
= NULL
;
209 * Don't allow interfaces to be added
210 * the device has disappeared.
212 if (!test_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
) ||
213 !test_bit(DEVICE_STARTED
, &rt2x00dev
->flags
))
217 * We don't support mixed combinations of sta and ap virtual
218 * interfaces. We can only add this interface when the rival
219 * interface count is 0.
221 if ((conf
->type
== IEEE80211_IF_TYPE_AP
&& rt2x00dev
->intf_sta_count
) ||
222 (conf
->type
!= IEEE80211_IF_TYPE_AP
&& rt2x00dev
->intf_ap_count
))
226 * Check if we exceeded the maximum amount of supported interfaces.
228 if ((conf
->type
== IEEE80211_IF_TYPE_AP
&&
229 rt2x00dev
->intf_ap_count
>= rt2x00dev
->ops
->max_ap_intf
) ||
230 (conf
->type
!= IEEE80211_IF_TYPE_AP
&&
231 rt2x00dev
->intf_sta_count
>= rt2x00dev
->ops
->max_sta_intf
))
235 * Loop through all beacon queues to find a free
236 * entry. Since there are as much beacon entries
237 * as the maximum interfaces, this search shouldn't
240 for (i
= 0; i
< queue
->limit
; i
++) {
241 entry
= &queue
->entries
[i
];
242 if (!__test_and_set_bit(ENTRY_BCN_ASSIGNED
, &entry
->flags
))
246 if (unlikely(i
== queue
->limit
))
250 * We are now absolutely sure the interface can be created,
251 * increase interface count and start initialization.
254 if (conf
->type
== IEEE80211_IF_TYPE_AP
)
255 rt2x00dev
->intf_ap_count
++;
257 rt2x00dev
->intf_sta_count
++;
259 spin_lock_init(&intf
->lock
);
260 intf
->beacon
= entry
;
262 if (conf
->type
== IEEE80211_IF_TYPE_AP
)
263 memcpy(&intf
->bssid
, conf
->mac_addr
, ETH_ALEN
);
264 memcpy(&intf
->mac
, conf
->mac_addr
, ETH_ALEN
);
267 * The MAC adddress must be configured after the device
268 * has been initialized. Otherwise the device can reset
271 rt2x00lib_config_intf(rt2x00dev
, intf
, conf
->type
, intf
->mac
, NULL
);
274 * Some filters depend on the current working mode. We can force
275 * an update during the next configure_filter() run by mac80211 by
276 * resetting the current packet_filter state.
278 rt2x00dev
->packet_filter
= 0;
282 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface
);
284 void rt2x00mac_remove_interface(struct ieee80211_hw
*hw
,
285 struct ieee80211_if_init_conf
*conf
)
287 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
288 struct rt2x00_intf
*intf
= vif_to_intf(conf
->vif
);
291 * Don't allow interfaces to be remove while
292 * either the device has disappeared or when
293 * no interface is present.
295 if (!test_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
) ||
296 (conf
->type
== IEEE80211_IF_TYPE_AP
&& !rt2x00dev
->intf_ap_count
) ||
297 (conf
->type
!= IEEE80211_IF_TYPE_AP
&& !rt2x00dev
->intf_sta_count
))
300 if (conf
->type
== IEEE80211_IF_TYPE_AP
)
301 rt2x00dev
->intf_ap_count
--;
303 rt2x00dev
->intf_sta_count
--;
306 * Release beacon entry so it is available for
307 * new interfaces again.
309 __clear_bit(ENTRY_BCN_ASSIGNED
, &intf
->beacon
->flags
);
312 * Make sure the bssid and mac address registers
313 * are cleared to prevent false ACKing of frames.
315 rt2x00lib_config_intf(rt2x00dev
, intf
,
316 IEEE80211_IF_TYPE_INVALID
, NULL
, NULL
);
318 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface
);
320 int rt2x00mac_config(struct ieee80211_hw
*hw
, struct ieee80211_conf
*conf
)
322 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
325 * Mac80211 might be calling this function while we are trying
326 * to remove the device or perhaps suspending it.
328 if (!test_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
))
332 * Check if we need to disable the radio,
333 * if this is not the case, at least the RX must be disabled.
335 if (test_bit(DEVICE_ENABLED_RADIO
, &rt2x00dev
->flags
)) {
336 if (!conf
->radio_enabled
)
337 rt2x00lib_disable_radio(rt2x00dev
);
339 rt2x00lib_toggle_rx(rt2x00dev
, STATE_RADIO_RX_OFF
);
342 rt2x00lib_config(rt2x00dev
, conf
, 0);
345 * Reenable RX only if the radio should be on.
347 if (test_bit(DEVICE_ENABLED_RADIO
, &rt2x00dev
->flags
))
348 rt2x00lib_toggle_rx(rt2x00dev
, STATE_RADIO_RX_ON
);
349 else if (conf
->radio_enabled
)
350 return rt2x00lib_enable_radio(rt2x00dev
);
354 EXPORT_SYMBOL_GPL(rt2x00mac_config
);
356 int rt2x00mac_config_interface(struct ieee80211_hw
*hw
,
357 struct ieee80211_vif
*vif
,
358 struct ieee80211_if_conf
*conf
)
360 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
361 struct rt2x00_intf
*intf
= vif_to_intf(vif
);
365 * Mac80211 might be calling this function while we are trying
366 * to remove the device or perhaps suspending it.
368 if (!test_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
))
371 spin_lock(&intf
->lock
);
374 * If the interface does not work in master mode,
375 * then the bssid value in the interface structure
378 if (conf
->type
!= IEEE80211_IF_TYPE_AP
)
379 memcpy(&intf
->bssid
, conf
->bssid
, ETH_ALEN
);
381 spin_unlock(&intf
->lock
);
384 * Call rt2x00_config_intf() outside of the spinlock context since
385 * the call will sleep for USB drivers. By using the ieee80211_if_conf
386 * values as arguments we make keep access to rt2x00_intf thread safe
387 * even without the lock.
389 rt2x00lib_config_intf(rt2x00dev
, intf
, conf
->type
, NULL
, conf
->bssid
);
392 * We only need to initialize the beacon when master mode is enabled.
394 if (conf
->type
!= IEEE80211_IF_TYPE_AP
|| !conf
->beacon
)
397 status
= rt2x00dev
->ops
->hw
->beacon_update(rt2x00dev
->hw
, conf
->beacon
);
399 dev_kfree_skb(conf
->beacon
);
403 EXPORT_SYMBOL_GPL(rt2x00mac_config_interface
);
405 void rt2x00mac_configure_filter(struct ieee80211_hw
*hw
,
406 unsigned int changed_flags
,
407 unsigned int *total_flags
,
408 int mc_count
, struct dev_addr_list
*mc_list
)
410 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
413 * Mask off any flags we are going to ignore
414 * from the total_flags field.
425 * Apply some rules to the filters:
426 * - Some filters imply different filters to be set.
427 * - Some things we can't filter out at all.
428 * - Multicast filter seems to kill broadcast traffic so never use it.
430 *total_flags
|= FIF_ALLMULTI
;
431 if (*total_flags
& FIF_OTHER_BSS
||
432 *total_flags
& FIF_PROMISC_IN_BSS
)
433 *total_flags
|= FIF_PROMISC_IN_BSS
| FIF_OTHER_BSS
;
436 * Check if there is any work left for us.
438 if (rt2x00dev
->packet_filter
== *total_flags
)
440 rt2x00dev
->packet_filter
= *total_flags
;
442 if (!test_bit(DRIVER_REQUIRE_SCHEDULED
, &rt2x00dev
->flags
))
443 rt2x00dev
->ops
->lib
->config_filter(rt2x00dev
, *total_flags
);
445 queue_work(rt2x00dev
->hw
->workqueue
, &rt2x00dev
->filter_work
);
447 EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter
);
449 int rt2x00mac_get_stats(struct ieee80211_hw
*hw
,
450 struct ieee80211_low_level_stats
*stats
)
452 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
455 * The dot11ACKFailureCount, dot11RTSFailureCount and
456 * dot11RTSSuccessCount are updated in interrupt time.
457 * dot11FCSErrorCount is updated in the link tuner.
459 memcpy(stats
, &rt2x00dev
->low_level_stats
, sizeof(*stats
));
463 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats
);
465 int rt2x00mac_get_tx_stats(struct ieee80211_hw
*hw
,
466 struct ieee80211_tx_queue_stats
*stats
)
468 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
471 for (i
= 0; i
< rt2x00dev
->ops
->tx_queues
; i
++) {
472 stats
[i
].len
= rt2x00dev
->tx
[i
].length
;
473 stats
[i
].limit
= rt2x00dev
->tx
[i
].limit
;
474 stats
[i
].count
= rt2x00dev
->tx
[i
].count
;
479 EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats
);
481 void rt2x00mac_bss_info_changed(struct ieee80211_hw
*hw
,
482 struct ieee80211_vif
*vif
,
483 struct ieee80211_bss_conf
*bss_conf
,
486 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
487 struct rt2x00_intf
*intf
= vif_to_intf(vif
);
488 unsigned int delayed
= 0;
491 * When the association status has changed we must reset the link
492 * tuner counter. This is because some drivers determine if they
493 * should perform link tuning based on the number of seconds
494 * while associated or not associated.
496 if (changes
& BSS_CHANGED_ASSOC
) {
497 rt2x00dev
->link
.count
= 0;
500 rt2x00dev
->intf_associated
++;
502 rt2x00dev
->intf_associated
--;
504 if (!test_bit(DRIVER_REQUIRE_SCHEDULED
, &rt2x00dev
->flags
))
505 rt2x00leds_led_assoc(rt2x00dev
,
506 !!rt2x00dev
->intf_associated
);
508 delayed
|= DELAYED_LED_ASSOC
;
512 * When the erp information has changed, we should perform
513 * additional configuration steps. For all other changes we are done.
515 if (changes
& BSS_CHANGED_ERP_PREAMBLE
) {
516 if (!test_bit(DRIVER_REQUIRE_SCHEDULED
, &rt2x00dev
->flags
))
517 rt2x00lib_config_erp(rt2x00dev
, intf
, bss_conf
);
519 delayed
|= DELAYED_CONFIG_ERP
;
522 spin_lock(&intf
->lock
);
523 memcpy(&intf
->conf
, bss_conf
, sizeof(*bss_conf
));
525 intf
->delayed_flags
|= delayed
;
526 queue_work(rt2x00dev
->hw
->workqueue
, &rt2x00dev
->intf_work
);
528 spin_unlock(&intf
->lock
);
530 EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed
);
532 int rt2x00mac_conf_tx(struct ieee80211_hw
*hw
, u16 queue_idx
,
533 const struct ieee80211_tx_queue_params
*params
)
535 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
536 struct data_queue
*queue
;
538 queue
= rt2x00queue_get_queue(rt2x00dev
, queue_idx
);
539 if (unlikely(!queue
))
543 * The passed variables are stored as real value ((2^n)-1).
544 * Ralink registers require to know the bit number 'n'.
546 if (params
->cw_min
> 0)
547 queue
->cw_min
= fls(params
->cw_min
);
549 queue
->cw_min
= 5; /* cw_min: 2^5 = 32. */
551 if (params
->cw_max
> 0)
552 queue
->cw_max
= fls(params
->cw_max
);
554 queue
->cw_max
= 10; /* cw_min: 2^10 = 1024. */
556 if (params
->aifs
>= 0)
557 queue
->aifs
= params
->aifs
;
562 "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d.\n",
563 queue_idx
, queue
->cw_min
, queue
->cw_max
, queue
->aifs
);
567 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx
);