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 ieee80211_tx_info
*rts_info
;
41 if (tx_info
->flags
& IEEE80211_TX_CTL_USE_CTS_PROTECT
)
42 size
= sizeof(struct ieee80211_cts
);
44 size
= sizeof(struct ieee80211_rts
);
46 skb
= dev_alloc_skb(size
+ rt2x00dev
->hw
->extra_tx_headroom
);
48 WARNING(rt2x00dev
, "Failed to create RTS/CTS frame.\n");
49 return NETDEV_TX_BUSY
;
52 skb_reserve(skb
, rt2x00dev
->hw
->extra_tx_headroom
);
56 * Copy TX information over from original frame to
57 * RTS/CTS frame. Note that we set the no encryption flag
58 * since we don't want this frame to be encrypted.
59 * RTS frames should be acked, while CTS-to-self frames
60 * should not. The ready for TX flag is cleared to prevent
61 * it being automatically send when the descriptor is
62 * written to the hardware.
64 memcpy(skb
->cb
, frag_skb
->cb
, sizeof(skb
->cb
));
65 rts_info
= IEEE80211_SKB_CB(skb
);
66 rts_info
->flags
|= IEEE80211_TX_CTL_DO_NOT_ENCRYPT
;
67 rts_info
->flags
&= ~IEEE80211_TX_CTL_USE_RTS_CTS
;
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
));
85 if (rt2x00queue_write_tx_frame(queue
, skb
)) {
86 dev_kfree_skb_any(skb
);
87 WARNING(rt2x00dev
, "Failed to send RTS/CTS frame.\n");
88 return NETDEV_TX_BUSY
;
94 int rt2x00mac_tx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
96 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
97 struct ieee80211_tx_info
*tx_info
= IEEE80211_SKB_CB(skb
);
98 struct ieee80211_hdr
*ieee80211hdr
= (struct ieee80211_hdr
*)skb
->data
;
99 enum data_queue_qid qid
= skb_get_queue_mapping(skb
);
100 struct data_queue
*queue
;
104 * Mac80211 might be calling this function while we are trying
105 * to remove the device or perhaps suspending it.
106 * Note that we can only stop the TX queues inside the TX path
107 * due to possible race conditions in mac80211.
109 if (!test_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
)) {
110 ieee80211_stop_queues(hw
);
111 dev_kfree_skb_any(skb
);
116 * Determine which queue to put packet on.
118 if (tx_info
->flags
& IEEE80211_TX_CTL_SEND_AFTER_DTIM
&&
119 test_bit(DRIVER_REQUIRE_ATIM_QUEUE
, &rt2x00dev
->flags
))
120 queue
= rt2x00queue_get_queue(rt2x00dev
, QID_ATIM
);
122 queue
= rt2x00queue_get_queue(rt2x00dev
, qid
);
123 if (unlikely(!queue
)) {
125 "Attempt to send packet over invalid queue %d.\n"
126 "Please file bug report to %s.\n", qid
, DRV_PROJECT
);
127 dev_kfree_skb_any(skb
);
132 * If CTS/RTS is required. create and queue that frame first.
133 * Make sure we have at least enough entries available to send
134 * this CTS/RTS frame as well as the data frame.
135 * Note that when the driver has set the set_rts_threshold()
136 * callback function it doesn't need software generation of
137 * either RTS or CTS-to-self frame and handles everything
138 * inside the hardware.
140 frame_control
= le16_to_cpu(ieee80211hdr
->frame_control
);
141 if ((tx_info
->flags
& (IEEE80211_TX_CTL_USE_RTS_CTS
|
142 IEEE80211_TX_CTL_USE_CTS_PROTECT
)) &&
143 !rt2x00dev
->ops
->hw
->set_rts_threshold
) {
144 if (rt2x00queue_available(queue
) <= 1) {
145 ieee80211_stop_queue(rt2x00dev
->hw
, qid
);
146 return NETDEV_TX_BUSY
;
149 if (rt2x00mac_tx_rts_cts(rt2x00dev
, queue
, skb
)) {
150 ieee80211_stop_queue(rt2x00dev
->hw
, qid
);
151 return NETDEV_TX_BUSY
;
155 if (rt2x00queue_write_tx_frame(queue
, skb
)) {
156 ieee80211_stop_queue(rt2x00dev
->hw
, qid
);
157 return NETDEV_TX_BUSY
;
160 if (rt2x00queue_threshold(queue
))
161 ieee80211_stop_queue(rt2x00dev
->hw
, qid
);
165 EXPORT_SYMBOL_GPL(rt2x00mac_tx
);
167 int rt2x00mac_start(struct ieee80211_hw
*hw
)
169 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
171 if (!test_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
))
174 return rt2x00lib_start(rt2x00dev
);
176 EXPORT_SYMBOL_GPL(rt2x00mac_start
);
178 void rt2x00mac_stop(struct ieee80211_hw
*hw
)
180 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
182 if (!test_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
))
185 rt2x00lib_stop(rt2x00dev
);
187 EXPORT_SYMBOL_GPL(rt2x00mac_stop
);
189 int rt2x00mac_add_interface(struct ieee80211_hw
*hw
,
190 struct ieee80211_if_init_conf
*conf
)
192 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
193 struct rt2x00_intf
*intf
= vif_to_intf(conf
->vif
);
194 struct data_queue
*queue
= rt2x00queue_get_queue(rt2x00dev
, QID_BEACON
);
195 struct queue_entry
*entry
= NULL
;
199 * Don't allow interfaces to be added
200 * the device has disappeared.
202 if (!test_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
) ||
203 !test_bit(DEVICE_STARTED
, &rt2x00dev
->flags
))
207 * We don't support mixed combinations of sta and ap virtual
208 * interfaces. We can only add this interface when the rival
209 * interface count is 0.
211 if ((conf
->type
== IEEE80211_IF_TYPE_AP
&& rt2x00dev
->intf_sta_count
) ||
212 (conf
->type
!= IEEE80211_IF_TYPE_AP
&& rt2x00dev
->intf_ap_count
))
216 * Check if we exceeded the maximum amount of supported interfaces.
218 if ((conf
->type
== IEEE80211_IF_TYPE_AP
&&
219 rt2x00dev
->intf_ap_count
>= rt2x00dev
->ops
->max_ap_intf
) ||
220 (conf
->type
!= IEEE80211_IF_TYPE_AP
&&
221 rt2x00dev
->intf_sta_count
>= rt2x00dev
->ops
->max_sta_intf
))
225 * Loop through all beacon queues to find a free
226 * entry. Since there are as much beacon entries
227 * as the maximum interfaces, this search shouldn't
230 for (i
= 0; i
< queue
->limit
; i
++) {
231 entry
= &queue
->entries
[i
];
232 if (!__test_and_set_bit(ENTRY_BCN_ASSIGNED
, &entry
->flags
))
236 if (unlikely(i
== queue
->limit
))
240 * We are now absolutely sure the interface can be created,
241 * increase interface count and start initialization.
244 if (conf
->type
== IEEE80211_IF_TYPE_AP
)
245 rt2x00dev
->intf_ap_count
++;
247 rt2x00dev
->intf_sta_count
++;
249 spin_lock_init(&intf
->lock
);
250 intf
->beacon
= entry
;
252 if (conf
->type
== IEEE80211_IF_TYPE_AP
)
253 memcpy(&intf
->bssid
, conf
->mac_addr
, ETH_ALEN
);
254 memcpy(&intf
->mac
, conf
->mac_addr
, ETH_ALEN
);
257 * The MAC adddress must be configured after the device
258 * has been initialized. Otherwise the device can reset
261 rt2x00lib_config_intf(rt2x00dev
, intf
, conf
->type
, intf
->mac
, NULL
);
264 * Some filters depend on the current working mode. We can force
265 * an update during the next configure_filter() run by mac80211 by
266 * resetting the current packet_filter state.
268 rt2x00dev
->packet_filter
= 0;
272 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface
);
274 void rt2x00mac_remove_interface(struct ieee80211_hw
*hw
,
275 struct ieee80211_if_init_conf
*conf
)
277 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
278 struct rt2x00_intf
*intf
= vif_to_intf(conf
->vif
);
281 * Don't allow interfaces to be remove while
282 * either the device has disappeared or when
283 * no interface is present.
285 if (!test_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
) ||
286 (conf
->type
== IEEE80211_IF_TYPE_AP
&& !rt2x00dev
->intf_ap_count
) ||
287 (conf
->type
!= IEEE80211_IF_TYPE_AP
&& !rt2x00dev
->intf_sta_count
))
290 if (conf
->type
== IEEE80211_IF_TYPE_AP
)
291 rt2x00dev
->intf_ap_count
--;
293 rt2x00dev
->intf_sta_count
--;
296 * Release beacon entry so it is available for
297 * new interfaces again.
299 __clear_bit(ENTRY_BCN_ASSIGNED
, &intf
->beacon
->flags
);
302 * Make sure the bssid and mac address registers
303 * are cleared to prevent false ACKing of frames.
305 rt2x00lib_config_intf(rt2x00dev
, intf
,
306 IEEE80211_IF_TYPE_INVALID
, NULL
, NULL
);
308 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface
);
310 int rt2x00mac_config(struct ieee80211_hw
*hw
, struct ieee80211_conf
*conf
)
312 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
315 * Mac80211 might be calling this function while we are trying
316 * to remove the device or perhaps suspending it.
318 if (!test_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
))
322 * Check if we need to disable the radio,
323 * if this is not the case, at least the RX must be disabled.
325 if (test_bit(DEVICE_ENABLED_RADIO
, &rt2x00dev
->flags
)) {
326 if (!conf
->radio_enabled
)
327 rt2x00lib_disable_radio(rt2x00dev
);
329 rt2x00lib_toggle_rx(rt2x00dev
, STATE_RADIO_RX_OFF
);
332 rt2x00lib_config(rt2x00dev
, conf
, 0);
335 * Reenable RX only if the radio should be on.
337 if (test_bit(DEVICE_ENABLED_RADIO
, &rt2x00dev
->flags
))
338 rt2x00lib_toggle_rx(rt2x00dev
, STATE_RADIO_RX_ON
);
339 else if (conf
->radio_enabled
)
340 return rt2x00lib_enable_radio(rt2x00dev
);
344 EXPORT_SYMBOL_GPL(rt2x00mac_config
);
346 int rt2x00mac_config_interface(struct ieee80211_hw
*hw
,
347 struct ieee80211_vif
*vif
,
348 struct ieee80211_if_conf
*conf
)
350 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
351 struct rt2x00_intf
*intf
= vif_to_intf(vif
);
352 int update_bssid
= 0;
356 * Mac80211 might be calling this function while we are trying
357 * to remove the device or perhaps suspending it.
359 if (!test_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
))
362 spin_lock(&intf
->lock
);
365 * conf->bssid can be NULL if coming from the internal
366 * beacon update routine.
368 if (conf
->changed
& IEEE80211_IFCC_BSSID
&& conf
->bssid
) {
370 memcpy(&intf
->bssid
, conf
->bssid
, ETH_ALEN
);
373 spin_unlock(&intf
->lock
);
376 * Call rt2x00_config_intf() outside of the spinlock context since
377 * the call will sleep for USB drivers. By using the ieee80211_if_conf
378 * values as arguments we make keep access to rt2x00_intf thread safe
379 * even without the lock.
381 rt2x00lib_config_intf(rt2x00dev
, intf
, vif
->type
, NULL
,
382 update_bssid
? conf
->bssid
: NULL
);
387 if (conf
->changed
& IEEE80211_IFCC_BEACON
)
388 status
= rt2x00queue_update_beacon(rt2x00dev
, vif
);
392 EXPORT_SYMBOL_GPL(rt2x00mac_config_interface
);
394 void rt2x00mac_configure_filter(struct ieee80211_hw
*hw
,
395 unsigned int changed_flags
,
396 unsigned int *total_flags
,
397 int mc_count
, struct dev_addr_list
*mc_list
)
399 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
402 * Mask off any flags we are going to ignore
403 * from the total_flags field.
414 * Apply some rules to the filters:
415 * - Some filters imply different filters to be set.
416 * - Some things we can't filter out at all.
417 * - Multicast filter seems to kill broadcast traffic so never use it.
419 *total_flags
|= FIF_ALLMULTI
;
420 if (*total_flags
& FIF_OTHER_BSS
||
421 *total_flags
& FIF_PROMISC_IN_BSS
)
422 *total_flags
|= FIF_PROMISC_IN_BSS
| FIF_OTHER_BSS
;
425 * Check if there is any work left for us.
427 if (rt2x00dev
->packet_filter
== *total_flags
)
429 rt2x00dev
->packet_filter
= *total_flags
;
431 if (!test_bit(DRIVER_REQUIRE_SCHEDULED
, &rt2x00dev
->flags
))
432 rt2x00dev
->ops
->lib
->config_filter(rt2x00dev
, *total_flags
);
434 queue_work(rt2x00dev
->hw
->workqueue
, &rt2x00dev
->filter_work
);
436 EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter
);
438 int rt2x00mac_get_stats(struct ieee80211_hw
*hw
,
439 struct ieee80211_low_level_stats
*stats
)
441 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
444 * The dot11ACKFailureCount, dot11RTSFailureCount and
445 * dot11RTSSuccessCount are updated in interrupt time.
446 * dot11FCSErrorCount is updated in the link tuner.
448 memcpy(stats
, &rt2x00dev
->low_level_stats
, sizeof(*stats
));
452 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats
);
454 int rt2x00mac_get_tx_stats(struct ieee80211_hw
*hw
,
455 struct ieee80211_tx_queue_stats
*stats
)
457 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
460 for (i
= 0; i
< rt2x00dev
->ops
->tx_queues
; i
++) {
461 stats
[i
].len
= rt2x00dev
->tx
[i
].length
;
462 stats
[i
].limit
= rt2x00dev
->tx
[i
].limit
;
463 stats
[i
].count
= rt2x00dev
->tx
[i
].count
;
468 EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats
);
470 void rt2x00mac_bss_info_changed(struct ieee80211_hw
*hw
,
471 struct ieee80211_vif
*vif
,
472 struct ieee80211_bss_conf
*bss_conf
,
475 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
476 struct rt2x00_intf
*intf
= vif_to_intf(vif
);
477 unsigned int delayed
= 0;
480 * When the association status has changed we must reset the link
481 * tuner counter. This is because some drivers determine if they
482 * should perform link tuning based on the number of seconds
483 * while associated or not associated.
485 if (changes
& BSS_CHANGED_ASSOC
) {
486 rt2x00dev
->link
.count
= 0;
489 rt2x00dev
->intf_associated
++;
491 rt2x00dev
->intf_associated
--;
493 if (!test_bit(DRIVER_REQUIRE_SCHEDULED
, &rt2x00dev
->flags
))
494 rt2x00leds_led_assoc(rt2x00dev
,
495 !!rt2x00dev
->intf_associated
);
497 delayed
|= DELAYED_LED_ASSOC
;
501 * When the erp information has changed, we should perform
502 * additional configuration steps. For all other changes we are done.
504 if (changes
& (BSS_CHANGED_ERP_PREAMBLE
| BSS_CHANGED_ERP_CTS_PROT
)) {
505 if (!test_bit(DRIVER_REQUIRE_SCHEDULED
, &rt2x00dev
->flags
))
506 rt2x00lib_config_erp(rt2x00dev
, intf
, bss_conf
);
508 delayed
|= DELAYED_CONFIG_ERP
;
511 spin_lock(&intf
->lock
);
512 memcpy(&intf
->conf
, bss_conf
, sizeof(*bss_conf
));
514 intf
->delayed_flags
|= delayed
;
515 schedule_work(&rt2x00dev
->intf_work
);
517 spin_unlock(&intf
->lock
);
519 EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed
);
521 int rt2x00mac_conf_tx(struct ieee80211_hw
*hw
, u16 queue_idx
,
522 const struct ieee80211_tx_queue_params
*params
)
524 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
525 struct data_queue
*queue
;
527 queue
= rt2x00queue_get_queue(rt2x00dev
, queue_idx
);
528 if (unlikely(!queue
))
532 * The passed variables are stored as real value ((2^n)-1).
533 * Ralink registers require to know the bit number 'n'.
535 if (params
->cw_min
> 0)
536 queue
->cw_min
= fls(params
->cw_min
);
538 queue
->cw_min
= 5; /* cw_min: 2^5 = 32. */
540 if (params
->cw_max
> 0)
541 queue
->cw_max
= fls(params
->cw_max
);
543 queue
->cw_max
= 10; /* cw_min: 2^10 = 1024. */
545 queue
->aifs
= params
->aifs
;
548 "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d.\n",
549 queue_idx
, queue
->cw_min
, queue
->cw_max
, queue
->aifs
);
553 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx
);