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
->flags
& IEEE80211_TX_CTL_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
->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 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 #ifdef CONFIG_RT2X00_LIB_CRYPTO
83 if (!frag_skb
->do_not_encrypt
)
84 data_length
+= rt2x00crypto_tx_overhead(tx_info
);
85 #endif /* CONFIG_RT2X00_LIB_CRYPTO */
87 if (tx_info
->flags
& IEEE80211_TX_CTL_USE_CTS_PROTECT
)
88 ieee80211_ctstoself_get(rt2x00dev
->hw
, tx_info
->control
.vif
,
89 frag_skb
->data
, data_length
, tx_info
,
90 (struct ieee80211_cts
*)(skb
->data
));
92 ieee80211_rts_get(rt2x00dev
->hw
, tx_info
->control
.vif
,
93 frag_skb
->data
, data_length
, tx_info
,
94 (struct ieee80211_rts
*)(skb
->data
));
96 retval
= rt2x00queue_write_tx_frame(queue
, skb
);
98 dev_kfree_skb_any(skb
);
99 WARNING(rt2x00dev
, "Failed to send RTS/CTS frame.\n");
105 int rt2x00mac_tx(struct ieee80211_hw
*hw
, struct sk_buff
*skb
)
107 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
108 struct ieee80211_tx_info
*tx_info
= IEEE80211_SKB_CB(skb
);
109 struct ieee80211_hdr
*ieee80211hdr
= (struct ieee80211_hdr
*)skb
->data
;
110 enum data_queue_qid qid
= skb_get_queue_mapping(skb
);
111 struct data_queue
*queue
;
115 * Mac80211 might be calling this function while we are trying
116 * to remove the device or perhaps suspending it.
117 * Note that we can only stop the TX queues inside the TX path
118 * due to possible race conditions in mac80211.
120 if (!test_bit(DEVICE_STATE_PRESENT
, &rt2x00dev
->flags
))
124 * Determine which queue to put packet on.
126 if (tx_info
->flags
& IEEE80211_TX_CTL_SEND_AFTER_DTIM
&&
127 test_bit(DRIVER_REQUIRE_ATIM_QUEUE
, &rt2x00dev
->flags
))
128 queue
= rt2x00queue_get_queue(rt2x00dev
, QID_ATIM
);
130 queue
= rt2x00queue_get_queue(rt2x00dev
, qid
);
131 if (unlikely(!queue
)) {
133 "Attempt to send packet over invalid queue %d.\n"
134 "Please file bug report to %s.\n", qid
, DRV_PROJECT
);
135 dev_kfree_skb_any(skb
);
140 * If CTS/RTS is required. create and queue that frame first.
141 * Make sure we have at least enough entries available to send
142 * this CTS/RTS frame as well as the data frame.
143 * Note that when the driver has set the set_rts_threshold()
144 * callback function it doesn't need software generation of
145 * either RTS or CTS-to-self frame and handles everything
146 * inside the hardware.
148 frame_control
= le16_to_cpu(ieee80211hdr
->frame_control
);
149 if ((tx_info
->flags
& (IEEE80211_TX_CTL_USE_RTS_CTS
|
150 IEEE80211_TX_CTL_USE_CTS_PROTECT
)) &&
151 !rt2x00dev
->ops
->hw
->set_rts_threshold
) {
152 if (rt2x00queue_available(queue
) <= 1)
155 if (rt2x00mac_tx_rts_cts(rt2x00dev
, queue
, skb
))
159 if (rt2x00queue_write_tx_frame(queue
, skb
))
162 if (rt2x00queue_threshold(queue
))
163 ieee80211_stop_queue(rt2x00dev
->hw
, qid
);
168 ieee80211_stop_queue(rt2x00dev
->hw
, qid
);
169 dev_kfree_skb_any(skb
);
172 EXPORT_SYMBOL_GPL(rt2x00mac_tx
);
174 int rt2x00mac_start(struct ieee80211_hw
*hw
)
176 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
178 if (!test_bit(DEVICE_STATE_PRESENT
, &rt2x00dev
->flags
))
181 return rt2x00lib_start(rt2x00dev
);
183 EXPORT_SYMBOL_GPL(rt2x00mac_start
);
185 void rt2x00mac_stop(struct ieee80211_hw
*hw
)
187 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
189 if (!test_bit(DEVICE_STATE_PRESENT
, &rt2x00dev
->flags
))
192 rt2x00lib_stop(rt2x00dev
);
194 EXPORT_SYMBOL_GPL(rt2x00mac_stop
);
196 int rt2x00mac_add_interface(struct ieee80211_hw
*hw
,
197 struct ieee80211_if_init_conf
*conf
)
199 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
200 struct rt2x00_intf
*intf
= vif_to_intf(conf
->vif
);
201 struct data_queue
*queue
= rt2x00queue_get_queue(rt2x00dev
, QID_BEACON
);
202 struct queue_entry
*entry
= NULL
;
206 * Don't allow interfaces to be added
207 * the device has disappeared.
209 if (!test_bit(DEVICE_STATE_PRESENT
, &rt2x00dev
->flags
) ||
210 !test_bit(DEVICE_STATE_STARTED
, &rt2x00dev
->flags
))
213 switch (conf
->type
) {
214 case NL80211_IFTYPE_AP
:
216 * We don't support mixed combinations of
217 * sta and ap interfaces.
219 if (rt2x00dev
->intf_sta_count
)
223 * Check if we exceeded the maximum amount
224 * of supported interfaces.
226 if (rt2x00dev
->intf_ap_count
>= rt2x00dev
->ops
->max_ap_intf
)
230 case NL80211_IFTYPE_STATION
:
231 case NL80211_IFTYPE_ADHOC
:
233 * We don't support mixed combinations of
234 * sta and ap interfaces.
236 if (rt2x00dev
->intf_ap_count
)
240 * Check if we exceeded the maximum amount
241 * of supported interfaces.
243 if (rt2x00dev
->intf_sta_count
>= rt2x00dev
->ops
->max_sta_intf
)
252 * Loop through all beacon queues to find a free
253 * entry. Since there are as much beacon entries
254 * as the maximum interfaces, this search shouldn't
257 for (i
= 0; i
< queue
->limit
; i
++) {
258 entry
= &queue
->entries
[i
];
259 if (!test_and_set_bit(ENTRY_BCN_ASSIGNED
, &entry
->flags
))
263 if (unlikely(i
== queue
->limit
))
267 * We are now absolutely sure the interface can be created,
268 * increase interface count and start initialization.
271 if (conf
->type
== NL80211_IFTYPE_AP
)
272 rt2x00dev
->intf_ap_count
++;
274 rt2x00dev
->intf_sta_count
++;
276 spin_lock_init(&intf
->lock
);
277 spin_lock_init(&intf
->seqlock
);
278 intf
->beacon
= entry
;
280 if (conf
->type
== NL80211_IFTYPE_AP
)
281 memcpy(&intf
->bssid
, conf
->mac_addr
, ETH_ALEN
);
282 memcpy(&intf
->mac
, conf
->mac_addr
, ETH_ALEN
);
285 * The MAC adddress must be configured after the device
286 * has been initialized. Otherwise the device can reset
289 rt2x00lib_config_intf(rt2x00dev
, intf
, conf
->type
, intf
->mac
, NULL
);
292 * Some filters depend on the current working mode. We can force
293 * an update during the next configure_filter() run by mac80211 by
294 * resetting the current packet_filter state.
296 rt2x00dev
->packet_filter
= 0;
300 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface
);
302 void rt2x00mac_remove_interface(struct ieee80211_hw
*hw
,
303 struct ieee80211_if_init_conf
*conf
)
305 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
306 struct rt2x00_intf
*intf
= vif_to_intf(conf
->vif
);
309 * Don't allow interfaces to be remove while
310 * either the device has disappeared or when
311 * no interface is present.
313 if (!test_bit(DEVICE_STATE_PRESENT
, &rt2x00dev
->flags
) ||
314 (conf
->type
== NL80211_IFTYPE_AP
&& !rt2x00dev
->intf_ap_count
) ||
315 (conf
->type
!= NL80211_IFTYPE_AP
&& !rt2x00dev
->intf_sta_count
))
318 if (conf
->type
== NL80211_IFTYPE_AP
)
319 rt2x00dev
->intf_ap_count
--;
321 rt2x00dev
->intf_sta_count
--;
324 * Release beacon entry so it is available for
325 * new interfaces again.
327 clear_bit(ENTRY_BCN_ASSIGNED
, &intf
->beacon
->flags
);
330 * Make sure the bssid and mac address registers
331 * are cleared to prevent false ACKing of frames.
333 rt2x00lib_config_intf(rt2x00dev
, intf
,
334 NL80211_IFTYPE_UNSPECIFIED
, NULL
, NULL
);
336 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface
);
338 int rt2x00mac_config(struct ieee80211_hw
*hw
, u32 changed
)
340 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
341 struct ieee80211_conf
*conf
= &hw
->conf
;
346 * Mac80211 might be calling this function while we are trying
347 * to remove the device or perhaps suspending it.
349 if (!test_bit(DEVICE_STATE_PRESENT
, &rt2x00dev
->flags
))
352 if (changed
& IEEE80211_CONF_CHANGE_RETRY_LIMITS
) {
353 rt2x00dev
->ops
->lib
->set_retry_limit(hw
,
354 conf
->short_frame_max_tx_count
,
355 conf
->long_frame_max_tx_count
);
357 changed
&= ~IEEE80211_CONF_CHANGE_RETRY_LIMITS
;
362 * Only change device state when the radio is enabled. It does not
363 * matter what parameters we have configured when the radio is disabled
364 * because we won't be able to send or receive anyway. Also note that
365 * some configuration parameters (e.g. channel and antenna values) can
366 * only be set when the radio is enabled.
368 radio_on
= test_bit(DEVICE_STATE_ENABLED_RADIO
, &rt2x00dev
->flags
);
369 if (conf
->radio_enabled
) {
370 /* For programming the values, we have to turn RX off */
371 rt2x00lib_toggle_rx(rt2x00dev
, STATE_RADIO_RX_OFF
);
373 /* Enable the radio */
374 status
= rt2x00lib_enable_radio(rt2x00dev
);
375 if (unlikely(status
))
379 * When we've just turned on the radio, we want to reprogram
380 * everything to ensure a consistent state
382 rt2x00lib_config(rt2x00dev
, conf
, !radio_on
);
384 /* Turn RX back on */
385 rt2x00lib_toggle_rx(rt2x00dev
, STATE_RADIO_RX_ON
);
387 /* Disable the radio */
388 rt2x00lib_disable_radio(rt2x00dev
);
393 EXPORT_SYMBOL_GPL(rt2x00mac_config
);
395 int rt2x00mac_config_interface(struct ieee80211_hw
*hw
,
396 struct ieee80211_vif
*vif
,
397 struct ieee80211_if_conf
*conf
)
399 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
400 struct rt2x00_intf
*intf
= vif_to_intf(vif
);
401 int update_bssid
= 0;
405 * Mac80211 might be calling this function while we are trying
406 * to remove the device or perhaps suspending it.
408 if (!test_bit(DEVICE_STATE_PRESENT
, &rt2x00dev
->flags
))
411 spin_lock(&intf
->lock
);
414 * conf->bssid can be NULL if coming from the internal
415 * beacon update routine.
417 if (conf
->changed
& IEEE80211_IFCC_BSSID
&& conf
->bssid
) {
419 memcpy(&intf
->bssid
, conf
->bssid
, ETH_ALEN
);
422 spin_unlock(&intf
->lock
);
425 * Call rt2x00_config_intf() outside of the spinlock context since
426 * the call will sleep for USB drivers. By using the ieee80211_if_conf
427 * values as arguments we make keep access to rt2x00_intf thread safe
428 * even without the lock.
430 rt2x00lib_config_intf(rt2x00dev
, intf
, vif
->type
, NULL
,
431 update_bssid
? conf
->bssid
: NULL
);
436 if (conf
->changed
& IEEE80211_IFCC_BEACON
)
437 status
= rt2x00queue_update_beacon(rt2x00dev
, vif
);
441 EXPORT_SYMBOL_GPL(rt2x00mac_config_interface
);
443 void rt2x00mac_configure_filter(struct ieee80211_hw
*hw
,
444 unsigned int changed_flags
,
445 unsigned int *total_flags
,
446 int mc_count
, struct dev_addr_list
*mc_list
)
448 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
451 * Mask off any flags we are going to ignore
452 * from the total_flags field.
463 * Apply some rules to the filters:
464 * - Some filters imply different filters to be set.
465 * - Some things we can't filter out at all.
466 * - Multicast filter seems to kill broadcast traffic so never use it.
468 *total_flags
|= FIF_ALLMULTI
;
469 if (*total_flags
& FIF_OTHER_BSS
||
470 *total_flags
& FIF_PROMISC_IN_BSS
)
471 *total_flags
|= FIF_PROMISC_IN_BSS
| FIF_OTHER_BSS
;
474 * Check if there is any work left for us.
476 if (rt2x00dev
->packet_filter
== *total_flags
)
478 rt2x00dev
->packet_filter
= *total_flags
;
480 if (!test_bit(DRIVER_REQUIRE_SCHEDULED
, &rt2x00dev
->flags
))
481 rt2x00dev
->ops
->lib
->config_filter(rt2x00dev
, *total_flags
);
483 queue_work(rt2x00dev
->hw
->workqueue
, &rt2x00dev
->filter_work
);
485 EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter
);
487 #ifdef CONFIG_RT2X00_LIB_CRYPTO
488 int rt2x00mac_set_key(struct ieee80211_hw
*hw
, enum set_key_cmd cmd
,
489 const u8
*local_address
, const u8
*address
,
490 struct ieee80211_key_conf
*key
)
492 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
493 int (*set_key
) (struct rt2x00_dev
*rt2x00dev
,
494 struct rt2x00lib_crypto
*crypto
,
495 struct ieee80211_key_conf
*key
);
496 struct rt2x00lib_crypto crypto
;
498 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 * Each BSS has a maximum of 4 shared keys.
542 * Shared key index values:
550 * Both pairwise as shared key indeces are determined by
551 * driver. This is required because the hardware requires
552 * keys to be assigned in correct order (When key 1 is
553 * provided but key 0 is not, then the key is not found
554 * by the hardware during RX).
559 if (key
->flags
& IEEE80211_KEY_FLAG_PAIRWISE
)
560 set_key
= rt2x00dev
->ops
->lib
->config_pairwise_key
;
562 set_key
= rt2x00dev
->ops
->lib
->config_shared_key
;
567 return set_key(rt2x00dev
, &crypto
, key
);
569 EXPORT_SYMBOL_GPL(rt2x00mac_set_key
);
570 #endif /* CONFIG_RT2X00_LIB_CRYPTO */
572 int rt2x00mac_get_stats(struct ieee80211_hw
*hw
,
573 struct ieee80211_low_level_stats
*stats
)
575 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
578 * The dot11ACKFailureCount, dot11RTSFailureCount and
579 * dot11RTSSuccessCount are updated in interrupt time.
580 * dot11FCSErrorCount is updated in the link tuner.
582 memcpy(stats
, &rt2x00dev
->low_level_stats
, sizeof(*stats
));
586 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats
);
588 int rt2x00mac_get_tx_stats(struct ieee80211_hw
*hw
,
589 struct ieee80211_tx_queue_stats
*stats
)
591 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
594 for (i
= 0; i
< rt2x00dev
->ops
->tx_queues
; i
++) {
595 stats
[i
].len
= rt2x00dev
->tx
[i
].length
;
596 stats
[i
].limit
= rt2x00dev
->tx
[i
].limit
;
597 stats
[i
].count
= rt2x00dev
->tx
[i
].count
;
602 EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats
);
604 void rt2x00mac_bss_info_changed(struct ieee80211_hw
*hw
,
605 struct ieee80211_vif
*vif
,
606 struct ieee80211_bss_conf
*bss_conf
,
609 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
610 struct rt2x00_intf
*intf
= vif_to_intf(vif
);
611 unsigned int delayed
= 0;
614 * When the association status has changed we must reset the link
615 * tuner counter. This is because some drivers determine if they
616 * should perform link tuning based on the number of seconds
617 * while associated or not associated.
619 if (changes
& BSS_CHANGED_ASSOC
) {
620 rt2x00dev
->link
.count
= 0;
623 rt2x00dev
->intf_associated
++;
625 rt2x00dev
->intf_associated
--;
627 if (!test_bit(DRIVER_REQUIRE_SCHEDULED
, &rt2x00dev
->flags
))
628 rt2x00leds_led_assoc(rt2x00dev
,
629 !!rt2x00dev
->intf_associated
);
631 delayed
|= DELAYED_LED_ASSOC
;
635 * When the erp information has changed, we should perform
636 * additional configuration steps. For all other changes we are done.
638 if (changes
& (BSS_CHANGED_ERP_PREAMBLE
| BSS_CHANGED_ERP_CTS_PROT
)) {
639 if (!test_bit(DRIVER_REQUIRE_SCHEDULED
, &rt2x00dev
->flags
))
640 rt2x00lib_config_erp(rt2x00dev
, intf
, bss_conf
);
642 delayed
|= DELAYED_CONFIG_ERP
;
645 spin_lock(&intf
->lock
);
646 memcpy(&intf
->conf
, bss_conf
, sizeof(*bss_conf
));
648 intf
->delayed_flags
|= delayed
;
649 schedule_work(&rt2x00dev
->intf_work
);
651 spin_unlock(&intf
->lock
);
653 EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed
);
655 int rt2x00mac_conf_tx(struct ieee80211_hw
*hw
, u16 queue_idx
,
656 const struct ieee80211_tx_queue_params
*params
)
658 struct rt2x00_dev
*rt2x00dev
= hw
->priv
;
659 struct data_queue
*queue
;
661 queue
= rt2x00queue_get_queue(rt2x00dev
, queue_idx
);
662 if (unlikely(!queue
))
666 * The passed variables are stored as real value ((2^n)-1).
667 * Ralink registers require to know the bit number 'n'.
669 if (params
->cw_min
> 0)
670 queue
->cw_min
= fls(params
->cw_min
);
672 queue
->cw_min
= 5; /* cw_min: 2^5 = 32. */
674 if (params
->cw_max
> 0)
675 queue
->cw_max
= fls(params
->cw_max
);
677 queue
->cw_max
= 10; /* cw_min: 2^10 = 1024. */
679 queue
->aifs
= params
->aifs
;
680 queue
->txop
= params
->txop
;
683 "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d, TXop: %d.\n",
684 queue_idx
, queue
->cw_min
, queue
->cw_max
, queue
->aifs
, queue
->txop
);
688 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx
);