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
;
39 unsigned int data_length
;
42 if (tx_info
->control
.rates
[0].flags
& IEEE80211_TX_RC_USE_CTS_PROTECT
)
43 data_length
= sizeof(struct ieee80211_cts
);
45 data_length
= sizeof(struct ieee80211_rts
);
47 skb
= dev_alloc_skb(data_length
+ rt2x00dev
->hw
->extra_tx_headroom
);
49 WARNING(rt2x00dev
, "Failed to create RTS/CTS frame.\n");
53 skb_reserve(skb
, rt2x00dev
->hw
->extra_tx_headroom
);
54 skb_put(skb
, data_length
);
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
->control
.rates
[0].flags
&= ~IEEE80211_TX_RC_USE_RTS_CTS
;
68 rts_info
->control
.rates
[0].flags
&= ~IEEE80211_TX_RC_USE_CTS_PROTECT
;
69 rts_info
->flags
&= ~IEEE80211_TX_CTL_REQ_TX_STATUS
;
71 if (tx_info
->control
.rates
[0].flags
& IEEE80211_TX_RC_USE_CTS_PROTECT
)
72 rts_info
->flags
|= IEEE80211_TX_CTL_NO_ACK
;
74 rts_info
->flags
&= ~IEEE80211_TX_CTL_NO_ACK
;
76 skb
->do_not_encrypt
= 1;
79 * RTS/CTS frame should use the length of the frame plus any
80 * encryption overhead that will be added by the hardware.
82 if (!frag_skb
->do_not_encrypt
)
83 data_length
+= rt2x00crypto_tx_overhead(tx_info
);
85 if (tx_info
->control
.rates
[0].flags
& IEEE80211_TX_RC_USE_CTS_PROTECT
)
86 ieee80211_ctstoself_get(rt2x00dev
->hw
, tx_info
->control
.vif
,
87 frag_skb
->data
, data_length
, tx_info
,
88 (struct ieee80211_cts
*)(skb
->data
));
90 ieee80211_rts_get(rt2x00dev
->hw
, tx_info
->control
.vif
,
91 frag_skb
->data
, data_length
, tx_info
,
92 (struct ieee80211_rts
*)(skb
->data
));
94 retval
= rt2x00queue_write_tx_frame(queue
, skb
);
96 dev_kfree_skb_any(skb
);
97 WARNING(rt2x00dev
, "Failed to send RTS/CTS frame.\n");
103 int rt2x00mac_tx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
105 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
106 struct ieee80211_tx_info
*tx_info
= IEEE80211_SKB_CB(skb
);
107 struct ieee80211_hdr
*ieee80211hdr
= (struct ieee80211_hdr
*)skb
->data
;
108 enum data_queue_qid qid
= skb_get_queue_mapping(skb
);
109 struct data_queue
*queue
;
113 * Mac80211 might be calling this function while we are trying
114 * to remove the device or perhaps suspending it.
115 * Note that we can only stop the TX queues inside the TX path
116 * due to possible race conditions in mac80211.
118 if (!test_bit(DEVICE_STATE_PRESENT
, &rt2x00dev
->flags
))
122 * Determine which queue to put packet on.
124 if (tx_info
->flags
& IEEE80211_TX_CTL_SEND_AFTER_DTIM
&&
125 test_bit(DRIVER_REQUIRE_ATIM_QUEUE
, &rt2x00dev
->flags
))
126 queue
= rt2x00queue_get_queue(rt2x00dev
, QID_ATIM
);
128 queue
= rt2x00queue_get_queue(rt2x00dev
, qid
);
129 if (unlikely(!queue
)) {
131 "Attempt to send packet over invalid queue %d.\n"
132 "Please file bug report to %s.\n", qid
, DRV_PROJECT
);
137 * If CTS/RTS is required. create and queue that frame first.
138 * Make sure we have at least enough entries available to send
139 * this CTS/RTS frame as well as the data frame.
140 * Note that when the driver has set the set_rts_threshold()
141 * callback function it doesn't need software generation of
142 * either RTS or CTS-to-self frame and handles everything
143 * inside the hardware.
145 frame_control
= le16_to_cpu(ieee80211hdr
->frame_control
);
146 if ((tx_info
->control
.rates
[0].flags
& (IEEE80211_TX_RC_USE_RTS_CTS
|
147 IEEE80211_TX_RC_USE_CTS_PROTECT
)) &&
148 !rt2x00dev
->ops
->hw
->set_rts_threshold
) {
149 if (rt2x00queue_available(queue
) <= 1)
152 if (rt2x00mac_tx_rts_cts(rt2x00dev
, queue
, skb
))
156 if (rt2x00queue_write_tx_frame(queue
, skb
))
159 if (rt2x00queue_threshold(queue
))
160 ieee80211_stop_queue(rt2x00dev
->hw
, qid
);
165 ieee80211_stop_queue(rt2x00dev
->hw
, qid
);
166 dev_kfree_skb_any(skb
);
169 EXPORT_SYMBOL_GPL(rt2x00mac_tx
);
171 int rt2x00mac_start(struct ieee80211_hw
*hw
)
173 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
175 if (!test_bit(DEVICE_STATE_PRESENT
, &rt2x00dev
->flags
))
178 return rt2x00lib_start(rt2x00dev
);
180 EXPORT_SYMBOL_GPL(rt2x00mac_start
);
182 void rt2x00mac_stop(struct ieee80211_hw
*hw
)
184 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
186 if (!test_bit(DEVICE_STATE_PRESENT
, &rt2x00dev
->flags
))
189 rt2x00lib_stop(rt2x00dev
);
191 EXPORT_SYMBOL_GPL(rt2x00mac_stop
);
193 int rt2x00mac_add_interface(struct ieee80211_hw
*hw
,
194 struct ieee80211_if_init_conf
*conf
)
196 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
197 struct rt2x00_intf
*intf
= vif_to_intf(conf
->vif
);
198 struct data_queue
*queue
= rt2x00queue_get_queue(rt2x00dev
, QID_BEACON
);
199 struct queue_entry
*entry
= NULL
;
203 * Don't allow interfaces to be added
204 * the device has disappeared.
206 if (!test_bit(DEVICE_STATE_PRESENT
, &rt2x00dev
->flags
) ||
207 !test_bit(DEVICE_STATE_STARTED
, &rt2x00dev
->flags
))
210 switch (conf
->type
) {
211 case NL80211_IFTYPE_AP
:
213 * We don't support mixed combinations of
214 * sta and ap interfaces.
216 if (rt2x00dev
->intf_sta_count
)
220 * Check if we exceeded the maximum amount
221 * of supported interfaces.
223 if (rt2x00dev
->intf_ap_count
>= rt2x00dev
->ops
->max_ap_intf
)
227 case NL80211_IFTYPE_STATION
:
228 case NL80211_IFTYPE_ADHOC
:
230 * We don't support mixed combinations of
231 * sta and ap interfaces.
233 if (rt2x00dev
->intf_ap_count
)
237 * Check if we exceeded the maximum amount
238 * of supported interfaces.
240 if (rt2x00dev
->intf_sta_count
>= rt2x00dev
->ops
->max_sta_intf
)
249 * Loop through all beacon queues to find a free
250 * entry. Since there are as much beacon entries
251 * as the maximum interfaces, this search shouldn't
254 for (i
= 0; i
< queue
->limit
; i
++) {
255 entry
= &queue
->entries
[i
];
256 if (!test_and_set_bit(ENTRY_BCN_ASSIGNED
, &entry
->flags
))
260 if (unlikely(i
== queue
->limit
))
264 * We are now absolutely sure the interface can be created,
265 * increase interface count and start initialization.
268 if (conf
->type
== NL80211_IFTYPE_AP
)
269 rt2x00dev
->intf_ap_count
++;
271 rt2x00dev
->intf_sta_count
++;
273 spin_lock_init(&intf
->lock
);
274 spin_lock_init(&intf
->seqlock
);
275 intf
->beacon
= entry
;
277 if (conf
->type
== NL80211_IFTYPE_AP
)
278 memcpy(&intf
->bssid
, conf
->mac_addr
, ETH_ALEN
);
279 memcpy(&intf
->mac
, conf
->mac_addr
, ETH_ALEN
);
282 * The MAC adddress must be configured after the device
283 * has been initialized. Otherwise the device can reset
286 rt2x00lib_config_intf(rt2x00dev
, intf
, conf
->type
, intf
->mac
, NULL
);
289 * Some filters depend on the current working mode. We can force
290 * an update during the next configure_filter() run by mac80211 by
291 * resetting the current packet_filter state.
293 rt2x00dev
->packet_filter
= 0;
297 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface
);
299 void rt2x00mac_remove_interface(struct ieee80211_hw
*hw
,
300 struct ieee80211_if_init_conf
*conf
)
302 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
303 struct rt2x00_intf
*intf
= vif_to_intf(conf
->vif
);
306 * Don't allow interfaces to be remove while
307 * either the device has disappeared or when
308 * no interface is present.
310 if (!test_bit(DEVICE_STATE_PRESENT
, &rt2x00dev
->flags
) ||
311 (conf
->type
== NL80211_IFTYPE_AP
&& !rt2x00dev
->intf_ap_count
) ||
312 (conf
->type
!= NL80211_IFTYPE_AP
&& !rt2x00dev
->intf_sta_count
))
315 if (conf
->type
== NL80211_IFTYPE_AP
)
316 rt2x00dev
->intf_ap_count
--;
318 rt2x00dev
->intf_sta_count
--;
321 * Release beacon entry so it is available for
322 * new interfaces again.
324 clear_bit(ENTRY_BCN_ASSIGNED
, &intf
->beacon
->flags
);
327 * Make sure the bssid and mac address registers
328 * are cleared to prevent false ACKing of frames.
330 rt2x00lib_config_intf(rt2x00dev
, intf
,
331 NL80211_IFTYPE_UNSPECIFIED
, NULL
, NULL
);
333 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface
);
335 int rt2x00mac_config(struct ieee80211_hw
*hw
, u32 changed
)
337 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
338 struct ieee80211_conf
*conf
= &hw
->conf
;
342 * Mac80211 might be calling this function while we are trying
343 * to remove the device or perhaps suspending it.
345 if (!test_bit(DEVICE_STATE_PRESENT
, &rt2x00dev
->flags
))
349 * Only change device state when the radio is enabled. It does not
350 * matter what parameters we have configured when the radio is disabled
351 * because we won't be able to send or receive anyway. Also note that
352 * some configuration parameters (e.g. channel and antenna values) can
353 * only be set when the radio is enabled.
355 if (conf
->radio_enabled
) {
356 /* For programming the values, we have to turn RX off */
357 rt2x00lib_toggle_rx(rt2x00dev
, STATE_RADIO_RX_OFF
);
359 /* Enable the radio */
360 status
= rt2x00lib_enable_radio(rt2x00dev
);
361 if (unlikely(status
))
365 * When we've just turned on the radio, we want to reprogram
366 * everything to ensure a consistent state
368 rt2x00lib_config(rt2x00dev
, conf
, changed
);
371 * The radio was enabled, configure the antenna to the
372 * default settings, the link tuner will later start
373 * continue configuring the antenna based on the software
374 * diversity. But for non-diversity configurations, we need
375 * to have configured the correct state now.
377 if (changed
& IEEE80211_CONF_CHANGE_RADIO_ENABLED
)
378 rt2x00lib_config_antenna(rt2x00dev
,
379 &rt2x00dev
->default_ant
);
381 /* Turn RX back on */
382 rt2x00lib_toggle_rx(rt2x00dev
, STATE_RADIO_RX_ON
);
384 /* Disable the radio */
385 rt2x00lib_disable_radio(rt2x00dev
);
390 EXPORT_SYMBOL_GPL(rt2x00mac_config
);
392 int rt2x00mac_config_interface(struct ieee80211_hw
*hw
,
393 struct ieee80211_vif
*vif
,
394 struct ieee80211_if_conf
*conf
)
396 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
397 struct rt2x00_intf
*intf
= vif_to_intf(vif
);
398 int update_bssid
= 0;
402 * Mac80211 might be calling this function while we are trying
403 * to remove the device or perhaps suspending it.
405 if (!test_bit(DEVICE_STATE_PRESENT
, &rt2x00dev
->flags
))
408 spin_lock(&intf
->lock
);
411 * conf->bssid can be NULL if coming from the internal
412 * beacon update routine.
414 if (conf
->changed
& IEEE80211_IFCC_BSSID
&& conf
->bssid
) {
416 memcpy(&intf
->bssid
, conf
->bssid
, ETH_ALEN
);
419 spin_unlock(&intf
->lock
);
422 * Call rt2x00_config_intf() outside of the spinlock context since
423 * the call will sleep for USB drivers. By using the ieee80211_if_conf
424 * values as arguments we make keep access to rt2x00_intf thread safe
425 * even without the lock.
427 rt2x00lib_config_intf(rt2x00dev
, intf
, vif
->type
, NULL
,
428 update_bssid
? conf
->bssid
: NULL
);
433 if (conf
->changed
& IEEE80211_IFCC_BEACON
)
434 status
= rt2x00queue_update_beacon(rt2x00dev
, vif
);
438 EXPORT_SYMBOL_GPL(rt2x00mac_config_interface
);
440 void rt2x00mac_configure_filter(struct ieee80211_hw
*hw
,
441 unsigned int changed_flags
,
442 unsigned int *total_flags
,
443 int mc_count
, struct dev_addr_list
*mc_list
)
445 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
448 * Mask off any flags we are going to ignore
449 * from the total_flags field.
460 * Apply some rules to the filters:
461 * - Some filters imply different filters to be set.
462 * - Some things we can't filter out at all.
463 * - Multicast filter seems to kill broadcast traffic so never use it.
465 *total_flags
|= FIF_ALLMULTI
;
466 if (*total_flags
& FIF_OTHER_BSS
||
467 *total_flags
& FIF_PROMISC_IN_BSS
)
468 *total_flags
|= FIF_PROMISC_IN_BSS
| FIF_OTHER_BSS
;
471 * Check if there is any work left for us.
473 if (rt2x00dev
->packet_filter
== *total_flags
)
475 rt2x00dev
->packet_filter
= *total_flags
;
477 if (!test_bit(DRIVER_REQUIRE_SCHEDULED
, &rt2x00dev
->flags
))
478 rt2x00dev
->ops
->lib
->config_filter(rt2x00dev
, *total_flags
);
480 queue_work(rt2x00dev
->hw
->workqueue
, &rt2x00dev
->filter_work
);
482 EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter
);
484 #ifdef CONFIG_RT2X00_LIB_CRYPTO
485 int rt2x00mac_set_key(struct ieee80211_hw
*hw
, enum set_key_cmd cmd
,
486 const u8
*local_address
, const u8
*address
,
487 struct ieee80211_key_conf
*key
)
489 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
490 struct ieee80211_sta
*sta
;
491 int (*set_key
) (struct rt2x00_dev
*rt2x00dev
,
492 struct rt2x00lib_crypto
*crypto
,
493 struct ieee80211_key_conf
*key
);
494 struct rt2x00lib_crypto crypto
;
496 if (!test_bit(DEVICE_STATE_PRESENT
, &rt2x00dev
->flags
))
498 else if (!test_bit(CONFIG_SUPPORT_HW_CRYPTO
, &rt2x00dev
->flags
))
500 else if (key
->keylen
> 32)
503 memset(&crypto
, 0, sizeof(crypto
));
506 * When in STA mode, bssidx is always 0 otherwise local_address[5]
507 * contains the bss number, see BSS_ID_MASK comments for details.
509 if (rt2x00dev
->intf_sta_count
)
513 local_address
[5] & (rt2x00dev
->ops
->max_ap_intf
- 1);
515 crypto
.cipher
= rt2x00crypto_key_to_cipher(key
);
516 if (crypto
.cipher
== CIPHER_NONE
)
520 crypto
.address
= address
;
522 if (crypto
.cipher
== CIPHER_TKIP
) {
523 if (key
->keylen
> NL80211_TKIP_DATA_OFFSET_ENCR_KEY
)
525 &key
->key
[NL80211_TKIP_DATA_OFFSET_ENCR_KEY
],
528 if (key
->keylen
> NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY
)
529 memcpy(&crypto
.tx_mic
,
530 &key
->key
[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY
],
531 sizeof(crypto
.tx_mic
));
533 if (key
->keylen
> NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY
)
534 memcpy(&crypto
.rx_mic
,
535 &key
->key
[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY
],
536 sizeof(crypto
.rx_mic
));
538 memcpy(&crypto
.key
, &key
->key
[0], key
->keylen
);
541 * Discover the Association ID from mac80211.
542 * Some drivers need this information when updating the
543 * hardware key (either adding or removing).
546 sta
= ieee80211_find_sta(hw
, address
);
548 crypto
.aid
= sta
->aid
;
552 * Each BSS has a maximum of 4 shared keys.
553 * Shared key index values:
561 * Both pairwise as shared key indeces are determined by
562 * driver. This is required because the hardware requires
563 * keys to be assigned in correct order (When key 1 is
564 * provided but key 0 is not, then the key is not found
565 * by the hardware during RX).
570 if (key
->flags
& IEEE80211_KEY_FLAG_PAIRWISE
)
571 set_key
= rt2x00dev
->ops
->lib
->config_pairwise_key
;
573 set_key
= rt2x00dev
->ops
->lib
->config_shared_key
;
578 return set_key(rt2x00dev
, &crypto
, key
);
580 EXPORT_SYMBOL_GPL(rt2x00mac_set_key
);
581 #endif /* CONFIG_RT2X00_LIB_CRYPTO */
583 int rt2x00mac_get_stats(struct ieee80211_hw
*hw
,
584 struct ieee80211_low_level_stats
*stats
)
586 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
589 * The dot11ACKFailureCount, dot11RTSFailureCount and
590 * dot11RTSSuccessCount are updated in interrupt time.
591 * dot11FCSErrorCount is updated in the link tuner.
593 memcpy(stats
, &rt2x00dev
->low_level_stats
, sizeof(*stats
));
597 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats
);
599 int rt2x00mac_get_tx_stats(struct ieee80211_hw
*hw
,
600 struct ieee80211_tx_queue_stats
*stats
)
602 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
605 for (i
= 0; i
< rt2x00dev
->ops
->tx_queues
; i
++) {
606 stats
[i
].len
= rt2x00dev
->tx
[i
].length
;
607 stats
[i
].limit
= rt2x00dev
->tx
[i
].limit
;
608 stats
[i
].count
= rt2x00dev
->tx
[i
].count
;
613 EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats
);
615 void rt2x00mac_bss_info_changed(struct ieee80211_hw
*hw
,
616 struct ieee80211_vif
*vif
,
617 struct ieee80211_bss_conf
*bss_conf
,
620 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
621 struct rt2x00_intf
*intf
= vif_to_intf(vif
);
622 unsigned int delayed
= 0;
625 * When the association status has changed we must reset the link
626 * tuner counter. This is because some drivers determine if they
627 * should perform link tuning based on the number of seconds
628 * while associated or not associated.
630 if (changes
& BSS_CHANGED_ASSOC
) {
631 rt2x00dev
->link
.count
= 0;
634 rt2x00dev
->intf_associated
++;
636 rt2x00dev
->intf_associated
--;
638 if (!test_bit(DRIVER_REQUIRE_SCHEDULED
, &rt2x00dev
->flags
))
639 rt2x00leds_led_assoc(rt2x00dev
,
640 !!rt2x00dev
->intf_associated
);
642 delayed
|= DELAYED_LED_ASSOC
;
646 * When the erp information has changed, we should perform
647 * additional configuration steps. For all other changes we are done.
649 if (changes
& ~(BSS_CHANGED_ASSOC
| BSS_CHANGED_HT
)) {
650 if (!test_bit(DRIVER_REQUIRE_SCHEDULED
, &rt2x00dev
->flags
))
651 rt2x00lib_config_erp(rt2x00dev
, intf
, bss_conf
);
653 delayed
|= DELAYED_CONFIG_ERP
;
656 spin_lock(&intf
->lock
);
658 intf
->delayed_flags
|= delayed
;
659 schedule_work(&rt2x00dev
->intf_work
);
661 spin_unlock(&intf
->lock
);
663 EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed
);
665 int rt2x00mac_conf_tx(struct ieee80211_hw
*hw
, u16 queue_idx
,
666 const struct ieee80211_tx_queue_params
*params
)
668 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
669 struct data_queue
*queue
;
671 queue
= rt2x00queue_get_queue(rt2x00dev
, queue_idx
);
672 if (unlikely(!queue
))
676 * The passed variables are stored as real value ((2^n)-1).
677 * Ralink registers require to know the bit number 'n'.
679 if (params
->cw_min
> 0)
680 queue
->cw_min
= fls(params
->cw_min
);
682 queue
->cw_min
= 5; /* cw_min: 2^5 = 32. */
684 if (params
->cw_max
> 0)
685 queue
->cw_max
= fls(params
->cw_max
);
687 queue
->cw_max
= 10; /* cw_min: 2^10 = 1024. */
689 queue
->aifs
= params
->aifs
;
690 queue
->txop
= params
->txop
;
693 "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d, TXop: %d.\n",
694 queue_idx
, queue
->cw_min
, queue
->cw_max
, queue
->aifs
, queue
->txop
);
698 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx
);