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
)
37 struct skb_frame_desc
*skbdesc
;
41 if (control
->flags
& IEEE80211_TXCTL_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
);
55 if (control
->flags
& IEEE80211_TXCTL_USE_CTS_PROTECT
)
56 ieee80211_ctstoself_get(rt2x00dev
->hw
, control
->vif
,
57 frag_skb
->data
, frag_skb
->len
, control
,
58 (struct ieee80211_cts
*)(skb
->data
));
60 ieee80211_rts_get(rt2x00dev
->hw
, control
->vif
,
61 frag_skb
->data
, frag_skb
->len
, control
,
62 (struct ieee80211_rts
*)(skb
->data
));
65 * Initialize skb descriptor
67 skbdesc
= get_skb_frame_desc(skb
);
68 memset(skbdesc
, 0, sizeof(*skbdesc
));
69 skbdesc
->flags
|= FRAME_DESC_DRIVER_GENERATED
;
71 if (rt2x00dev
->ops
->lib
->write_tx_data(rt2x00dev
, queue
, skb
, control
)) {
72 WARNING(rt2x00dev
, "Failed to send RTS/CTS frame.\n");
73 return NETDEV_TX_BUSY
;
79 int rt2x00mac_tx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
,
80 struct ieee80211_tx_control
*control
)
82 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
83 struct ieee80211_hdr
*ieee80211hdr
= (struct ieee80211_hdr
*)skb
->data
;
84 struct data_queue
*queue
;
85 struct skb_frame_desc
*skbdesc
;
89 * Mac80211 might be calling this function while we are trying
90 * to remove the device or perhaps suspending it.
91 * Note that we can only stop the TX queues inside the TX path
92 * due to possible race conditions in mac80211.
94 if (!test_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
)) {
95 ieee80211_stop_queues(hw
);
100 * Determine which queue to put packet on.
102 if (control
->flags
& IEEE80211_TXCTL_SEND_AFTER_DTIM
&&
103 test_bit(DRIVER_REQUIRE_ATIM_QUEUE
, &rt2x00dev
->flags
))
104 queue
= rt2x00queue_get_queue(rt2x00dev
, RT2X00_BCN_QUEUE_ATIM
);
106 queue
= rt2x00queue_get_queue(rt2x00dev
, control
->queue
);
107 if (unlikely(!queue
)) {
109 "Attempt to send packet over invalid queue %d.\n"
110 "Please file bug report to %s.\n",
111 control
->queue
, DRV_PROJECT
);
112 dev_kfree_skb_any(skb
);
117 * If CTS/RTS is required. and this frame is not CTS or RTS,
118 * create and queue that frame first. But make sure we have
119 * at least enough entries available to send this CTS/RTS
120 * frame as well as the data frame.
122 frame_control
= le16_to_cpu(ieee80211hdr
->frame_control
);
123 if (!is_rts_frame(frame_control
) && !is_cts_frame(frame_control
) &&
124 (control
->flags
& (IEEE80211_TXCTL_USE_RTS_CTS
|
125 IEEE80211_TXCTL_USE_CTS_PROTECT
))) {
126 if (rt2x00queue_available(queue
) <= 1) {
127 ieee80211_stop_queue(rt2x00dev
->hw
, control
->queue
);
128 return NETDEV_TX_BUSY
;
131 if (rt2x00mac_tx_rts_cts(rt2x00dev
, queue
, skb
, control
)) {
132 ieee80211_stop_queue(rt2x00dev
->hw
, control
->queue
);
133 return NETDEV_TX_BUSY
;
138 * Initialize skb descriptor
140 skbdesc
= get_skb_frame_desc(skb
);
141 memset(skbdesc
, 0, sizeof(*skbdesc
));
143 if (rt2x00dev
->ops
->lib
->write_tx_data(rt2x00dev
, queue
, skb
, control
)) {
144 ieee80211_stop_queue(rt2x00dev
->hw
, control
->queue
);
145 return NETDEV_TX_BUSY
;
148 if (rt2x00queue_full(queue
))
149 ieee80211_stop_queue(rt2x00dev
->hw
, control
->queue
);
151 if (rt2x00dev
->ops
->lib
->kick_tx_queue
)
152 rt2x00dev
->ops
->lib
->kick_tx_queue(rt2x00dev
, control
->queue
);
156 EXPORT_SYMBOL_GPL(rt2x00mac_tx
);
158 int rt2x00mac_start(struct ieee80211_hw
*hw
)
160 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
162 if (!test_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
))
165 return rt2x00lib_start(rt2x00dev
);
167 EXPORT_SYMBOL_GPL(rt2x00mac_start
);
169 void rt2x00mac_stop(struct ieee80211_hw
*hw
)
171 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
173 if (!test_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
))
176 rt2x00lib_stop(rt2x00dev
);
178 EXPORT_SYMBOL_GPL(rt2x00mac_stop
);
180 int rt2x00mac_add_interface(struct ieee80211_hw
*hw
,
181 struct ieee80211_if_init_conf
*conf
)
183 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
184 struct rt2x00_intf
*intf
= vif_to_intf(conf
->vif
);
185 struct data_queue
*queue
=
186 rt2x00queue_get_queue(rt2x00dev
, RT2X00_BCN_QUEUE_BEACON
);
187 struct queue_entry
*entry
= NULL
;
191 * Don't allow interfaces to be added
192 * the device has disappeared.
194 if (!test_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
) ||
195 !test_bit(DEVICE_STARTED
, &rt2x00dev
->flags
))
199 * When we don't support mixed interfaces (a combination
200 * of sta and ap virtual interfaces) then we can only
201 * add this interface when the rival interface count is 0.
203 if (!test_bit(DRIVER_SUPPORT_MIXED_INTERFACES
, &rt2x00dev
->flags
) &&
204 ((conf
->type
== IEEE80211_IF_TYPE_AP
&& rt2x00dev
->intf_sta_count
) ||
205 (conf
->type
!= IEEE80211_IF_TYPE_AP
&& rt2x00dev
->intf_ap_count
)))
209 * Check if we exceeded the maximum amount of supported interfaces.
211 if ((conf
->type
== IEEE80211_IF_TYPE_AP
&&
212 rt2x00dev
->intf_ap_count
>= rt2x00dev
->ops
->max_ap_intf
) ||
213 (conf
->type
!= IEEE80211_IF_TYPE_AP
&&
214 rt2x00dev
->intf_sta_count
>= rt2x00dev
->ops
->max_sta_intf
))
218 * Loop through all beacon queues to find a free
219 * entry. Since there are as much beacon entries
220 * as the maximum interfaces, this search shouldn't
223 for (i
= 0; i
< queue
->limit
; i
++) {
224 entry
= &queue
->entries
[i
];
225 if (!__test_and_set_bit(ENTRY_BCN_ASSIGNED
, &entry
->flags
))
229 if (unlikely(i
== queue
->limit
))
233 * We are now absolutely sure the interface can be created,
234 * increase interface count and start initialization.
237 if (conf
->type
== IEEE80211_IF_TYPE_AP
)
238 rt2x00dev
->intf_ap_count
++;
240 rt2x00dev
->intf_sta_count
++;
242 spin_lock_init(&intf
->lock
);
243 intf
->beacon
= entry
;
245 if (conf
->type
== IEEE80211_IF_TYPE_AP
)
246 memcpy(&intf
->bssid
, conf
->mac_addr
, ETH_ALEN
);
247 memcpy(&intf
->mac
, conf
->mac_addr
, ETH_ALEN
);
250 * The MAC adddress must be configured after the device
251 * has been initialized. Otherwise the device can reset
254 rt2x00lib_config_intf(rt2x00dev
, intf
, conf
->type
, intf
->mac
, NULL
);
258 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface
);
260 void rt2x00mac_remove_interface(struct ieee80211_hw
*hw
,
261 struct ieee80211_if_init_conf
*conf
)
263 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
264 struct rt2x00_intf
*intf
= vif_to_intf(conf
->vif
);
267 * Don't allow interfaces to be remove while
268 * either the device has disappeared or when
269 * no interface is present.
271 if (!test_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
) ||
272 (conf
->type
== IEEE80211_IF_TYPE_AP
&& !rt2x00dev
->intf_ap_count
) ||
273 (conf
->type
!= IEEE80211_IF_TYPE_AP
&& !rt2x00dev
->intf_sta_count
))
276 if (conf
->type
== IEEE80211_IF_TYPE_AP
)
277 rt2x00dev
->intf_ap_count
--;
279 rt2x00dev
->intf_sta_count
--;
282 * Release beacon entry so it is available for
283 * new interfaces again.
285 __clear_bit(ENTRY_BCN_ASSIGNED
, &intf
->beacon
->flags
);
288 * Make sure the bssid and mac address registers
289 * are cleared to prevent false ACKing of frames.
291 rt2x00lib_config_intf(rt2x00dev
, intf
,
292 IEEE80211_IF_TYPE_INVALID
, NULL
, NULL
);
294 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface
);
296 int rt2x00mac_config(struct ieee80211_hw
*hw
, struct ieee80211_conf
*conf
)
298 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
301 * Mac80211 might be calling this function while we are trying
302 * to remove the device or perhaps suspending it.
304 if (!test_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
))
308 * Check if we need to disable the radio,
309 * if this is not the case, at least the RX must be disabled.
311 if (test_bit(DEVICE_ENABLED_RADIO
, &rt2x00dev
->flags
)) {
312 if (!conf
->radio_enabled
)
313 rt2x00lib_disable_radio(rt2x00dev
);
315 rt2x00lib_toggle_rx(rt2x00dev
, STATE_RADIO_RX_OFF
);
318 rt2x00lib_config(rt2x00dev
, conf
, 0);
321 * Reenable RX only if the radio should be on.
323 if (test_bit(DEVICE_ENABLED_RADIO
, &rt2x00dev
->flags
))
324 rt2x00lib_toggle_rx(rt2x00dev
, STATE_RADIO_RX_ON
);
325 else if (conf
->radio_enabled
)
326 return rt2x00lib_enable_radio(rt2x00dev
);
330 EXPORT_SYMBOL_GPL(rt2x00mac_config
);
332 int rt2x00mac_config_interface(struct ieee80211_hw
*hw
,
333 struct ieee80211_vif
*vif
,
334 struct ieee80211_if_conf
*conf
)
336 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
337 struct rt2x00_intf
*intf
= vif_to_intf(vif
);
341 * Mac80211 might be calling this function while we are trying
342 * to remove the device or perhaps suspending it.
344 if (!test_bit(DEVICE_PRESENT
, &rt2x00dev
->flags
))
347 spin_lock(&intf
->lock
);
350 * If the interface does not work in master mode,
351 * then the bssid value in the interface structure
354 if (conf
->type
!= IEEE80211_IF_TYPE_AP
)
355 memcpy(&intf
->bssid
, conf
->bssid
, ETH_ALEN
);
357 spin_unlock(&intf
->lock
);
360 * Call rt2x00_config_intf() outside of the spinlock context since
361 * the call will sleep for USB drivers. By using the ieee80211_if_conf
362 * values as arguments we make keep access to rt2x00_intf thread safe
363 * even without the lock.
365 rt2x00lib_config_intf(rt2x00dev
, intf
, conf
->type
, NULL
, conf
->bssid
);
368 * We only need to initialize the beacon when master mode is enabled.
370 if (conf
->type
!= IEEE80211_IF_TYPE_AP
|| !conf
->beacon
)
373 status
= rt2x00dev
->ops
->hw
->beacon_update(rt2x00dev
->hw
,
375 conf
->beacon_control
);
377 dev_kfree_skb(conf
->beacon
);
381 EXPORT_SYMBOL_GPL(rt2x00mac_config_interface
);
383 void rt2x00mac_configure_filter(struct ieee80211_hw
*hw
,
384 unsigned int changed_flags
,
385 unsigned int *total_flags
,
386 int mc_count
, struct dev_addr_list
*mc_list
)
388 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
391 * Mask off any flags we are going to ignore
392 * from the total_flags field.
403 * Apply some rules to the filters:
404 * - Some filters imply different filters to be set.
405 * - Some things we can't filter out at all.
406 * - Multicast filter seems to kill broadcast traffic so never use it.
408 *total_flags
|= FIF_ALLMULTI
;
409 if (*total_flags
& FIF_OTHER_BSS
||
410 *total_flags
& FIF_PROMISC_IN_BSS
)
411 *total_flags
|= FIF_PROMISC_IN_BSS
| FIF_OTHER_BSS
;
414 * Check if there is any work left for us.
416 if (rt2x00dev
->packet_filter
== *total_flags
)
418 rt2x00dev
->packet_filter
= *total_flags
;
420 if (!test_bit(DRIVER_REQUIRE_SCHEDULED
, &rt2x00dev
->flags
))
421 rt2x00dev
->ops
->lib
->config_filter(rt2x00dev
, *total_flags
);
423 queue_work(rt2x00dev
->hw
->workqueue
, &rt2x00dev
->filter_work
);
425 EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter
);
427 int rt2x00mac_get_stats(struct ieee80211_hw
*hw
,
428 struct ieee80211_low_level_stats
*stats
)
430 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
433 * The dot11ACKFailureCount, dot11RTSFailureCount and
434 * dot11RTSSuccessCount are updated in interrupt time.
435 * dot11FCSErrorCount is updated in the link tuner.
437 memcpy(stats
, &rt2x00dev
->low_level_stats
, sizeof(*stats
));
441 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats
);
443 int rt2x00mac_get_tx_stats(struct ieee80211_hw
*hw
,
444 struct ieee80211_tx_queue_stats
*stats
)
446 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
449 for (i
= 0; i
< hw
->queues
; i
++) {
450 stats
->data
[i
].len
= rt2x00dev
->tx
[i
].length
;
451 stats
->data
[i
].limit
= rt2x00dev
->tx
[i
].limit
;
452 stats
->data
[i
].count
= rt2x00dev
->tx
[i
].count
;
457 EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats
);
459 void rt2x00mac_bss_info_changed(struct ieee80211_hw
*hw
,
460 struct ieee80211_vif
*vif
,
461 struct ieee80211_bss_conf
*bss_conf
,
464 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
465 struct rt2x00_intf
*intf
= vif_to_intf(vif
);
466 unsigned int delayed
= 0;
469 * When the association status has changed we must reset the link
470 * tuner counter. This is because some drivers determine if they
471 * should perform link tuning based on the number of seconds
472 * while associated or not associated.
474 if (changes
& BSS_CHANGED_ASSOC
) {
475 rt2x00dev
->link
.count
= 0;
478 rt2x00dev
->intf_associated
++;
480 rt2x00dev
->intf_associated
--;
484 * When the erp information has changed, we should perform
485 * additional configuration steps. For all other changes we are done.
487 if (changes
& BSS_CHANGED_ERP_PREAMBLE
) {
488 if (!test_bit(DRIVER_REQUIRE_SCHEDULED
, &rt2x00dev
->flags
))
489 rt2x00lib_config_erp(rt2x00dev
, intf
, bss_conf
);
491 delayed
|= DELAYED_CONFIG_ERP
;
494 spin_lock(&intf
->lock
);
495 memcpy(&intf
->conf
, bss_conf
, sizeof(*bss_conf
));
497 intf
->delayed_flags
|= delayed
;
498 queue_work(rt2x00dev
->hw
->workqueue
, &rt2x00dev
->intf_work
);
500 spin_unlock(&intf
->lock
);
502 EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed
);
504 int rt2x00mac_conf_tx(struct ieee80211_hw
*hw
, int queue_idx
,
505 const struct ieee80211_tx_queue_params
*params
)
507 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
508 struct data_queue
*queue
;
510 queue
= rt2x00queue_get_queue(rt2x00dev
, queue_idx
);
511 if (unlikely(!queue
))
515 * The passed variables are stored as real value ((2^n)-1).
516 * Ralink registers require to know the bit number 'n'.
518 if (params
->cw_min
> 0)
519 queue
->cw_min
= fls(params
->cw_min
);
521 queue
->cw_min
= 5; /* cw_min: 2^5 = 32. */
523 if (params
->cw_max
> 0)
524 queue
->cw_max
= fls(params
->cw_max
);
526 queue
->cw_max
= 10; /* cw_min: 2^10 = 1024. */
528 if (params
->aifs
>= 0)
529 queue
->aifs
= params
->aifs
;
534 "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d.\n",
535 queue_idx
, queue
->cw_min
, queue
->cw_max
, queue
->aifs
);
539 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx
);