2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 #include <linux/kernel.h>
12 #include <linux/rtnetlink.h>
13 #include <linux/module.h>
14 #include <linux/slab.h>
16 #include "ieee80211_i.h"
19 struct rate_control_alg
{
20 struct list_head list
;
21 const struct rate_control_ops
*ops
;
24 static LIST_HEAD(rate_ctrl_algs
);
25 static DEFINE_MUTEX(rate_ctrl_mutex
);
27 static char *ieee80211_default_rc_algo
= CONFIG_MAC80211_RC_DEFAULT
;
28 module_param(ieee80211_default_rc_algo
, charp
, 0644);
29 MODULE_PARM_DESC(ieee80211_default_rc_algo
,
30 "Default rate control algorithm for mac80211 to use");
32 void rate_control_rate_init(struct sta_info
*sta
)
34 struct ieee80211_local
*local
= sta
->sdata
->local
;
35 struct rate_control_ref
*ref
= sta
->rate_ctrl
;
36 struct ieee80211_sta
*ista
= &sta
->sta
;
37 void *priv_sta
= sta
->rate_ctrl_priv
;
38 struct ieee80211_supported_band
*sband
;
39 struct ieee80211_chanctx_conf
*chanctx_conf
;
41 ieee80211_sta_set_rx_nss(sta
);
48 chanctx_conf
= rcu_dereference(sta
->sdata
->vif
.chanctx_conf
);
49 if (WARN_ON(!chanctx_conf
)) {
54 sband
= local
->hw
.wiphy
->bands
[chanctx_conf
->def
.chan
->band
];
56 spin_lock_bh(&sta
->rate_ctrl_lock
);
57 ref
->ops
->rate_init(ref
->priv
, sband
, &chanctx_conf
->def
, ista
,
59 spin_unlock_bh(&sta
->rate_ctrl_lock
);
61 set_sta_flag(sta
, WLAN_STA_RATE_CONTROL
);
64 void rate_control_rate_update(struct ieee80211_local
*local
,
65 struct ieee80211_supported_band
*sband
,
66 struct sta_info
*sta
, u32 changed
)
68 struct rate_control_ref
*ref
= local
->rate_ctrl
;
69 struct ieee80211_sta
*ista
= &sta
->sta
;
70 void *priv_sta
= sta
->rate_ctrl_priv
;
71 struct ieee80211_chanctx_conf
*chanctx_conf
;
73 if (ref
&& ref
->ops
->rate_update
) {
76 chanctx_conf
= rcu_dereference(sta
->sdata
->vif
.chanctx_conf
);
77 if (WARN_ON(!chanctx_conf
)) {
82 spin_lock_bh(&sta
->rate_ctrl_lock
);
83 ref
->ops
->rate_update(ref
->priv
, sband
, &chanctx_conf
->def
,
84 ista
, priv_sta
, changed
);
85 spin_unlock_bh(&sta
->rate_ctrl_lock
);
88 drv_sta_rc_update(local
, sta
->sdata
, &sta
->sta
, changed
);
91 int ieee80211_rate_control_register(const struct rate_control_ops
*ops
)
93 struct rate_control_alg
*alg
;
98 mutex_lock(&rate_ctrl_mutex
);
99 list_for_each_entry(alg
, &rate_ctrl_algs
, list
) {
100 if (!strcmp(alg
->ops
->name
, ops
->name
)) {
101 /* don't register an algorithm twice */
103 mutex_unlock(&rate_ctrl_mutex
);
108 alg
= kzalloc(sizeof(*alg
), GFP_KERNEL
);
110 mutex_unlock(&rate_ctrl_mutex
);
115 list_add_tail(&alg
->list
, &rate_ctrl_algs
);
116 mutex_unlock(&rate_ctrl_mutex
);
120 EXPORT_SYMBOL(ieee80211_rate_control_register
);
122 void ieee80211_rate_control_unregister(const struct rate_control_ops
*ops
)
124 struct rate_control_alg
*alg
;
126 mutex_lock(&rate_ctrl_mutex
);
127 list_for_each_entry(alg
, &rate_ctrl_algs
, list
) {
128 if (alg
->ops
== ops
) {
129 list_del(&alg
->list
);
134 mutex_unlock(&rate_ctrl_mutex
);
136 EXPORT_SYMBOL(ieee80211_rate_control_unregister
);
138 static const struct rate_control_ops
*
139 ieee80211_try_rate_control_ops_get(const char *name
)
141 struct rate_control_alg
*alg
;
142 const struct rate_control_ops
*ops
= NULL
;
147 mutex_lock(&rate_ctrl_mutex
);
148 list_for_each_entry(alg
, &rate_ctrl_algs
, list
) {
149 if (!strcmp(alg
->ops
->name
, name
)) {
154 mutex_unlock(&rate_ctrl_mutex
);
158 /* Get the rate control algorithm. */
159 static const struct rate_control_ops
*
160 ieee80211_rate_control_ops_get(const char *name
)
162 const struct rate_control_ops
*ops
;
163 const char *alg_name
;
165 kernel_param_lock(THIS_MODULE
);
167 alg_name
= ieee80211_default_rc_algo
;
171 ops
= ieee80211_try_rate_control_ops_get(alg_name
);
173 /* try default if specific alg requested but not found */
174 ops
= ieee80211_try_rate_control_ops_get(ieee80211_default_rc_algo
);
176 /* try built-in one if specific alg requested but not found */
177 if (!ops
&& strlen(CONFIG_MAC80211_RC_DEFAULT
))
178 ops
= ieee80211_try_rate_control_ops_get(CONFIG_MAC80211_RC_DEFAULT
);
179 kernel_param_unlock(THIS_MODULE
);
184 #ifdef CONFIG_MAC80211_DEBUGFS
185 static ssize_t
rcname_read(struct file
*file
, char __user
*userbuf
,
186 size_t count
, loff_t
*ppos
)
188 struct rate_control_ref
*ref
= file
->private_data
;
189 int len
= strlen(ref
->ops
->name
);
191 return simple_read_from_buffer(userbuf
, count
, ppos
,
192 ref
->ops
->name
, len
);
195 static const struct file_operations rcname_ops
= {
198 .llseek
= default_llseek
,
202 static struct rate_control_ref
*rate_control_alloc(const char *name
,
203 struct ieee80211_local
*local
)
205 struct dentry
*debugfsdir
= NULL
;
206 struct rate_control_ref
*ref
;
208 ref
= kmalloc(sizeof(struct rate_control_ref
), GFP_KERNEL
);
212 ref
->ops
= ieee80211_rate_control_ops_get(name
);
216 #ifdef CONFIG_MAC80211_DEBUGFS
217 debugfsdir
= debugfs_create_dir("rc", local
->hw
.wiphy
->debugfsdir
);
218 local
->debugfs
.rcdir
= debugfsdir
;
219 debugfs_create_file("name", 0400, debugfsdir
, ref
, &rcname_ops
);
222 ref
->priv
= ref
->ops
->alloc(&local
->hw
, debugfsdir
);
232 static void rate_control_free(struct rate_control_ref
*ctrl_ref
)
234 ctrl_ref
->ops
->free(ctrl_ref
->priv
);
236 #ifdef CONFIG_MAC80211_DEBUGFS
237 debugfs_remove_recursive(ctrl_ref
->local
->debugfs
.rcdir
);
238 ctrl_ref
->local
->debugfs
.rcdir
= NULL
;
244 static bool rc_no_data_or_no_ack_use_min(struct ieee80211_tx_rate_control
*txrc
)
246 struct sk_buff
*skb
= txrc
->skb
;
247 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
248 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
251 fc
= hdr
->frame_control
;
253 return (info
->flags
& (IEEE80211_TX_CTL_NO_ACK
|
254 IEEE80211_TX_CTL_USE_MINRATE
)) ||
255 !ieee80211_is_data(fc
);
258 static void rc_send_low_basicrate(s8
*idx
, u32 basic_rates
,
259 struct ieee80211_supported_band
*sband
)
263 if (basic_rates
== 0)
264 return; /* assume basic rates unknown and accept rate */
267 if (basic_rates
& (1 << *idx
))
268 return; /* selected rate is a basic rate */
270 for (i
= *idx
+ 1; i
<= sband
->n_bitrates
; i
++) {
271 if (basic_rates
& (1 << i
)) {
277 /* could not find a basic rate; use original selection */
280 static void __rate_control_send_low(struct ieee80211_hw
*hw
,
281 struct ieee80211_supported_band
*sband
,
282 struct ieee80211_sta
*sta
,
283 struct ieee80211_tx_info
*info
,
288 ieee80211_chandef_rate_flags(&hw
->conf
.chandef
);
290 if ((sband
->band
== IEEE80211_BAND_2GHZ
) &&
291 (info
->flags
& IEEE80211_TX_CTL_NO_CCK_RATE
))
292 rate_flags
|= IEEE80211_RATE_ERP_G
;
294 info
->control
.rates
[0].idx
= 0;
295 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
296 if (!(rate_mask
& BIT(i
)))
299 if ((rate_flags
& sband
->bitrates
[i
].flags
) != rate_flags
)
302 if (!rate_supported(sta
, sband
->band
, i
))
305 info
->control
.rates
[0].idx
= i
;
308 WARN_ON_ONCE(i
== sband
->n_bitrates
);
310 info
->control
.rates
[0].count
=
311 (info
->flags
& IEEE80211_TX_CTL_NO_ACK
) ?
312 1 : hw
->max_rate_tries
;
314 info
->control
.skip_table
= 1;
318 bool rate_control_send_low(struct ieee80211_sta
*pubsta
,
320 struct ieee80211_tx_rate_control
*txrc
)
322 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(txrc
->skb
);
323 struct ieee80211_supported_band
*sband
= txrc
->sband
;
324 struct sta_info
*sta
;
326 bool use_basicrate
= false;
328 if (!pubsta
|| !priv_sta
|| rc_no_data_or_no_ack_use_min(txrc
)) {
329 __rate_control_send_low(txrc
->hw
, sband
, pubsta
, info
,
330 txrc
->rate_idx_mask
);
332 if (!pubsta
&& txrc
->bss
) {
333 mcast_rate
= txrc
->bss_conf
->mcast_rate
[sband
->band
];
334 if (mcast_rate
> 0) {
335 info
->control
.rates
[0].idx
= mcast_rate
- 1;
338 use_basicrate
= true;
340 sta
= container_of(pubsta
, struct sta_info
, sta
);
341 if (ieee80211_vif_is_mesh(&sta
->sdata
->vif
))
342 use_basicrate
= true;
346 rc_send_low_basicrate(&info
->control
.rates
[0].idx
,
347 txrc
->bss_conf
->basic_rates
,
354 EXPORT_SYMBOL(rate_control_send_low
);
356 static bool rate_idx_match_legacy_mask(s8
*rate_idx
, int n_bitrates
, u32 mask
)
360 /* See whether the selected rate or anything below it is allowed. */
361 for (j
= *rate_idx
; j
>= 0; j
--) {
362 if (mask
& (1 << j
)) {
363 /* Okay, found a suitable rate. Use it. */
369 /* Try to find a higher rate that would be allowed */
370 for (j
= *rate_idx
+ 1; j
< n_bitrates
; j
++) {
371 if (mask
& (1 << j
)) {
372 /* Okay, found a suitable rate. Use it. */
380 static bool rate_idx_match_mcs_mask(s8
*rate_idx
, u8
*mcs_mask
)
385 ridx
= *rate_idx
/ 8;
386 rbit
= *rate_idx
% 8;
389 if (ridx
< 0 || ridx
>= IEEE80211_HT_MCS_MASK_LEN
)
392 /* See whether the selected rate or anything below it is allowed. */
393 for (i
= ridx
; i
>= 0; i
--) {
394 for (j
= rbit
; j
>= 0; j
--)
395 if (mcs_mask
[i
] & BIT(j
)) {
396 *rate_idx
= i
* 8 + j
;
402 /* Try to find a higher rate that would be allowed */
403 ridx
= (*rate_idx
+ 1) / 8;
404 rbit
= (*rate_idx
+ 1) % 8;
406 for (i
= ridx
; i
< IEEE80211_HT_MCS_MASK_LEN
; i
++) {
407 for (j
= rbit
; j
< 8; j
++)
408 if (mcs_mask
[i
] & BIT(j
)) {
409 *rate_idx
= i
* 8 + j
;
417 static bool rate_idx_match_vht_mcs_mask(s8
*rate_idx
, u16
*vht_mask
)
422 ridx
= *rate_idx
>> 4;
423 rbit
= *rate_idx
& 0xf;
425 if (ridx
< 0 || ridx
>= NL80211_VHT_NSS_MAX
)
428 /* See whether the selected rate or anything below it is allowed. */
429 for (i
= ridx
; i
>= 0; i
--) {
430 for (j
= rbit
; j
>= 0; j
--) {
431 if (vht_mask
[i
] & BIT(j
)) {
432 *rate_idx
= (i
<< 4) | j
;
439 /* Try to find a higher rate that would be allowed */
440 ridx
= (*rate_idx
+ 1) >> 4;
441 rbit
= (*rate_idx
+ 1) & 0xf;
443 for (i
= ridx
; i
< NL80211_VHT_NSS_MAX
; i
++) {
444 for (j
= rbit
; j
< 16; j
++) {
445 if (vht_mask
[i
] & BIT(j
)) {
446 *rate_idx
= (i
<< 4) | j
;
455 static void rate_idx_match_mask(s8
*rate_idx
, u16
*rate_flags
,
456 struct ieee80211_supported_band
*sband
,
457 enum nl80211_chan_width chan_width
,
459 u8 mcs_mask
[IEEE80211_HT_MCS_MASK_LEN
],
460 u16 vht_mask
[NL80211_VHT_NSS_MAX
])
462 if (*rate_flags
& IEEE80211_TX_RC_VHT_MCS
) {
463 /* handle VHT rates */
464 if (rate_idx_match_vht_mcs_mask(rate_idx
, vht_mask
))
468 /* keep protection flags */
469 *rate_flags
&= (IEEE80211_TX_RC_USE_RTS_CTS
|
470 IEEE80211_TX_RC_USE_CTS_PROTECT
|
471 IEEE80211_TX_RC_USE_SHORT_PREAMBLE
);
473 *rate_flags
|= IEEE80211_TX_RC_MCS
;
474 if (chan_width
== NL80211_CHAN_WIDTH_40
)
475 *rate_flags
|= IEEE80211_TX_RC_40_MHZ_WIDTH
;
477 if (rate_idx_match_mcs_mask(rate_idx
, mcs_mask
))
480 /* also try the legacy rates. */
481 *rate_flags
&= ~(IEEE80211_TX_RC_MCS
|
482 IEEE80211_TX_RC_40_MHZ_WIDTH
);
483 if (rate_idx_match_legacy_mask(rate_idx
, sband
->n_bitrates
,
486 } else if (*rate_flags
& IEEE80211_TX_RC_MCS
) {
487 /* handle HT rates */
488 if (rate_idx_match_mcs_mask(rate_idx
, mcs_mask
))
491 /* also try the legacy rates. */
493 /* keep protection flags */
494 *rate_flags
&= (IEEE80211_TX_RC_USE_RTS_CTS
|
495 IEEE80211_TX_RC_USE_CTS_PROTECT
|
496 IEEE80211_TX_RC_USE_SHORT_PREAMBLE
);
497 if (rate_idx_match_legacy_mask(rate_idx
, sband
->n_bitrates
,
501 /* handle legacy rates */
502 if (rate_idx_match_legacy_mask(rate_idx
, sband
->n_bitrates
,
506 /* if HT BSS, and we handle a data frame, also try HT rates */
507 switch (chan_width
) {
508 case NL80211_CHAN_WIDTH_20_NOHT
:
509 case NL80211_CHAN_WIDTH_5
:
510 case NL80211_CHAN_WIDTH_10
:
517 /* keep protection flags */
518 *rate_flags
&= (IEEE80211_TX_RC_USE_RTS_CTS
|
519 IEEE80211_TX_RC_USE_CTS_PROTECT
|
520 IEEE80211_TX_RC_USE_SHORT_PREAMBLE
);
522 *rate_flags
|= IEEE80211_TX_RC_MCS
;
524 if (chan_width
== NL80211_CHAN_WIDTH_40
)
525 *rate_flags
|= IEEE80211_TX_RC_40_MHZ_WIDTH
;
527 if (rate_idx_match_mcs_mask(rate_idx
, mcs_mask
))
532 * Uh.. No suitable rate exists. This should not really happen with
533 * sane TX rate mask configurations. However, should someone manage to
534 * configure supported rates and TX rate mask in incompatible way,
535 * allow the frame to be transmitted with whatever the rate control
540 static void rate_fixup_ratelist(struct ieee80211_vif
*vif
,
541 struct ieee80211_supported_band
*sband
,
542 struct ieee80211_tx_info
*info
,
543 struct ieee80211_tx_rate
*rates
,
546 struct ieee80211_rate
*rate
;
551 * Set up the RTS/CTS rate as the fastest basic rate
552 * that is not faster than the data rate unless there
553 * is no basic rate slower than the data rate, in which
554 * case we pick the slowest basic rate
556 * XXX: Should this check all retry rates?
558 if (!(rates
[0].flags
&
559 (IEEE80211_TX_RC_MCS
| IEEE80211_TX_RC_VHT_MCS
))) {
560 u32 basic_rates
= vif
->bss_conf
.basic_rates
;
561 s8 baserate
= basic_rates
? ffs(basic_rates
) - 1 : 0;
563 rate
= &sband
->bitrates
[rates
[0].idx
];
565 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
566 /* must be a basic rate */
567 if (!(basic_rates
& BIT(i
)))
569 /* must not be faster than the data rate */
570 if (sband
->bitrates
[i
].bitrate
> rate
->bitrate
)
573 if (sband
->bitrates
[baserate
].bitrate
<
574 sband
->bitrates
[i
].bitrate
)
578 info
->control
.rts_cts_rate_idx
= baserate
;
581 for (i
= 0; i
< max_rates
; i
++) {
583 * make sure there's no valid rate following
584 * an invalid one, just in case drivers don't
585 * take the API seriously to stop at -1.
591 if (rates
[i
].idx
< 0) {
597 * For now assume MCS is already set up correctly, this
600 if (rates
[i
].flags
& IEEE80211_TX_RC_MCS
) {
601 WARN_ON(rates
[i
].idx
> 76);
603 if (!(rates
[i
].flags
& IEEE80211_TX_RC_USE_RTS_CTS
) &&
604 info
->control
.use_cts_prot
)
606 IEEE80211_TX_RC_USE_CTS_PROTECT
;
610 if (rates
[i
].flags
& IEEE80211_TX_RC_VHT_MCS
) {
611 WARN_ON(ieee80211_rate_get_vht_mcs(&rates
[i
]) > 9);
615 /* set up RTS protection if desired */
616 if (info
->control
.use_rts
) {
617 rates
[i
].flags
|= IEEE80211_TX_RC_USE_RTS_CTS
;
618 info
->control
.use_cts_prot
= false;
622 if (WARN_ON_ONCE(rates
[i
].idx
>= sband
->n_bitrates
)) {
627 rate
= &sband
->bitrates
[rates
[i
].idx
];
629 /* set up short preamble */
630 if (info
->control
.short_preamble
&&
631 rate
->flags
& IEEE80211_RATE_SHORT_PREAMBLE
)
632 rates
[i
].flags
|= IEEE80211_TX_RC_USE_SHORT_PREAMBLE
;
634 /* set up G protection */
635 if (!(rates
[i
].flags
& IEEE80211_TX_RC_USE_RTS_CTS
) &&
636 info
->control
.use_cts_prot
&&
637 rate
->flags
& IEEE80211_RATE_ERP_G
)
638 rates
[i
].flags
|= IEEE80211_TX_RC_USE_CTS_PROTECT
;
643 static void rate_control_fill_sta_table(struct ieee80211_sta
*sta
,
644 struct ieee80211_tx_info
*info
,
645 struct ieee80211_tx_rate
*rates
,
648 struct ieee80211_sta_rates
*ratetbl
= NULL
;
651 if (sta
&& !info
->control
.skip_table
)
652 ratetbl
= rcu_dereference(sta
->rates
);
654 /* Fill remaining rate slots with data from the sta rate table. */
655 max_rates
= min_t(int, max_rates
, IEEE80211_TX_RATE_TABLE_SIZE
);
656 for (i
= 0; i
< max_rates
; i
++) {
657 if (i
< ARRAY_SIZE(info
->control
.rates
) &&
658 info
->control
.rates
[i
].idx
>= 0 &&
659 info
->control
.rates
[i
].count
) {
660 if (rates
!= info
->control
.rates
)
661 rates
[i
] = info
->control
.rates
[i
];
662 } else if (ratetbl
) {
663 rates
[i
].idx
= ratetbl
->rate
[i
].idx
;
664 rates
[i
].flags
= ratetbl
->rate
[i
].flags
;
665 if (info
->control
.use_rts
)
666 rates
[i
].count
= ratetbl
->rate
[i
].count_rts
;
667 else if (info
->control
.use_cts_prot
)
668 rates
[i
].count
= ratetbl
->rate
[i
].count_cts
;
670 rates
[i
].count
= ratetbl
->rate
[i
].count
;
676 if (rates
[i
].idx
< 0 || !rates
[i
].count
)
681 static bool rate_control_cap_mask(struct ieee80211_sub_if_data
*sdata
,
682 struct ieee80211_supported_band
*sband
,
683 struct ieee80211_sta
*sta
, u32
*mask
,
684 u8 mcs_mask
[IEEE80211_HT_MCS_MASK_LEN
],
685 u16 vht_mask
[NL80211_VHT_NSS_MAX
])
689 *mask
= sdata
->rc_rateidx_mask
[sband
->band
];
690 flags
= ieee80211_chandef_rate_flags(&sdata
->vif
.bss_conf
.chandef
);
691 for (i
= 0; i
< sband
->n_bitrates
; i
++) {
692 if ((flags
& sband
->bitrates
[i
].flags
) != flags
)
696 if (*mask
== (1 << sband
->n_bitrates
) - 1 &&
697 !sdata
->rc_has_mcs_mask
[sband
->band
] &&
698 !sdata
->rc_has_vht_mcs_mask
[sband
->band
])
701 if (sdata
->rc_has_mcs_mask
[sband
->band
])
702 memcpy(mcs_mask
, sdata
->rc_rateidx_mcs_mask
[sband
->band
],
703 IEEE80211_HT_MCS_MASK_LEN
);
705 memset(mcs_mask
, 0xff, IEEE80211_HT_MCS_MASK_LEN
);
707 if (sdata
->rc_has_vht_mcs_mask
[sband
->band
])
708 memcpy(vht_mask
, sdata
->rc_rateidx_vht_mcs_mask
[sband
->band
],
709 sizeof(u16
) * NL80211_VHT_NSS_MAX
);
711 memset(vht_mask
, 0xff, sizeof(u16
) * NL80211_VHT_NSS_MAX
);
715 u16 sta_vht_mask
[NL80211_VHT_NSS_MAX
];
717 /* Filter out rates that the STA does not support */
718 *mask
&= sta
->supp_rates
[sband
->band
];
719 for (i
= 0; i
< IEEE80211_HT_MCS_MASK_LEN
; i
++)
720 mcs_mask
[i
] &= sta
->ht_cap
.mcs
.rx_mask
[i
];
722 sta_vht_cap
= sta
->vht_cap
.vht_mcs
.rx_mcs_map
;
723 ieee80211_get_vht_mask_from_cap(sta_vht_cap
, sta_vht_mask
);
724 for (i
= 0; i
< NL80211_VHT_NSS_MAX
; i
++)
725 vht_mask
[i
] &= sta_vht_mask
[i
];
732 rate_control_apply_mask_ratetbl(struct sta_info
*sta
,
733 struct ieee80211_supported_band
*sband
,
734 struct ieee80211_sta_rates
*rates
)
738 u8 mcs_mask
[IEEE80211_HT_MCS_MASK_LEN
];
739 u16 vht_mask
[NL80211_VHT_NSS_MAX
];
740 enum nl80211_chan_width chan_width
;
742 if (!rate_control_cap_mask(sta
->sdata
, sband
, &sta
->sta
, &mask
,
746 chan_width
= sta
->sdata
->vif
.bss_conf
.chandef
.width
;
747 for (i
= 0; i
< IEEE80211_TX_RATE_TABLE_SIZE
; i
++) {
748 if (rates
->rate
[i
].idx
< 0)
751 rate_idx_match_mask(&rates
->rate
[i
].idx
, &rates
->rate
[i
].flags
,
752 sband
, chan_width
, mask
, mcs_mask
,
757 static void rate_control_apply_mask(struct ieee80211_sub_if_data
*sdata
,
758 struct ieee80211_sta
*sta
,
759 struct ieee80211_supported_band
*sband
,
760 struct ieee80211_tx_rate
*rates
,
763 enum nl80211_chan_width chan_width
;
764 u8 mcs_mask
[IEEE80211_HT_MCS_MASK_LEN
];
766 u16 rate_flags
, vht_mask
[NL80211_VHT_NSS_MAX
];
770 * Try to enforce the rateidx mask the user wanted. skip this if the
771 * default mask (allow all rates) is used to save some processing for
774 if (!rate_control_cap_mask(sdata
, sband
, sta
, &mask
, mcs_mask
,
779 * Make sure the rate index selected for each TX rate is
780 * included in the configured mask and change the rate indexes
783 chan_width
= sdata
->vif
.bss_conf
.chandef
.width
;
784 for (i
= 0; i
< max_rates
; i
++) {
785 /* Skip invalid rates */
786 if (rates
[i
].idx
< 0)
789 rate_flags
= rates
[i
].flags
;
790 rate_idx_match_mask(&rates
[i
].idx
, &rate_flags
, sband
,
791 chan_width
, mask
, mcs_mask
, vht_mask
);
792 rates
[i
].flags
= rate_flags
;
796 void ieee80211_get_tx_rates(struct ieee80211_vif
*vif
,
797 struct ieee80211_sta
*sta
,
799 struct ieee80211_tx_rate
*dest
,
802 struct ieee80211_sub_if_data
*sdata
;
803 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
804 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
805 struct ieee80211_supported_band
*sband
;
807 rate_control_fill_sta_table(sta
, info
, dest
, max_rates
);
812 sdata
= vif_to_sdata(vif
);
813 sband
= sdata
->local
->hw
.wiphy
->bands
[info
->band
];
815 if (ieee80211_is_data(hdr
->frame_control
))
816 rate_control_apply_mask(sdata
, sta
, sband
, dest
, max_rates
);
819 __rate_control_send_low(&sdata
->local
->hw
, sband
, sta
, info
,
820 sdata
->rc_rateidx_mask
[info
->band
]);
823 rate_fixup_ratelist(vif
, sband
, info
, dest
, max_rates
);
825 EXPORT_SYMBOL(ieee80211_get_tx_rates
);
827 void rate_control_get_rate(struct ieee80211_sub_if_data
*sdata
,
828 struct sta_info
*sta
,
829 struct ieee80211_tx_rate_control
*txrc
)
831 struct rate_control_ref
*ref
= sdata
->local
->rate_ctrl
;
832 void *priv_sta
= NULL
;
833 struct ieee80211_sta
*ista
= NULL
;
834 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(txrc
->skb
);
837 if (sta
&& test_sta_flag(sta
, WLAN_STA_RATE_CONTROL
)) {
839 priv_sta
= sta
->rate_ctrl_priv
;
842 for (i
= 0; i
< IEEE80211_TX_MAX_RATES
; i
++) {
843 info
->control
.rates
[i
].idx
= -1;
844 info
->control
.rates
[i
].flags
= 0;
845 info
->control
.rates
[i
].count
= 0;
848 if (ieee80211_hw_check(&sdata
->local
->hw
, HAS_RATE_CONTROL
))
852 spin_lock_bh(&sta
->rate_ctrl_lock
);
853 ref
->ops
->get_rate(ref
->priv
, ista
, priv_sta
, txrc
);
854 spin_unlock_bh(&sta
->rate_ctrl_lock
);
856 ref
->ops
->get_rate(ref
->priv
, NULL
, NULL
, txrc
);
859 if (ieee80211_hw_check(&sdata
->local
->hw
, SUPPORTS_RC_TABLE
))
862 ieee80211_get_tx_rates(&sdata
->vif
, ista
, txrc
->skb
,
864 ARRAY_SIZE(info
->control
.rates
));
867 int rate_control_set_rates(struct ieee80211_hw
*hw
,
868 struct ieee80211_sta
*pubsta
,
869 struct ieee80211_sta_rates
*rates
)
871 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
872 struct ieee80211_sta_rates
*old
;
873 struct ieee80211_supported_band
*sband
;
875 sband
= hw
->wiphy
->bands
[ieee80211_get_sdata_band(sta
->sdata
)];
876 rate_control_apply_mask_ratetbl(sta
, sband
, rates
);
878 * mac80211 guarantees that this function will not be called
879 * concurrently, so the following RCU access is safe, even without
880 * extra locking. This can not be checked easily, so we just set
881 * the condition to true.
883 old
= rcu_dereference_protected(pubsta
->rates
, true);
884 rcu_assign_pointer(pubsta
->rates
, rates
);
886 kfree_rcu(old
, rcu_head
);
888 drv_sta_rate_tbl_update(hw_to_local(hw
), sta
->sdata
, pubsta
);
892 EXPORT_SYMBOL(rate_control_set_rates
);
894 int ieee80211_init_rate_ctrl_alg(struct ieee80211_local
*local
,
897 struct rate_control_ref
*ref
;
901 if (local
->open_count
)
904 if (ieee80211_hw_check(&local
->hw
, HAS_RATE_CONTROL
)) {
905 if (WARN_ON(!local
->ops
->set_rts_threshold
))
910 ref
= rate_control_alloc(name
, local
);
912 wiphy_warn(local
->hw
.wiphy
,
913 "Failed to select rate control algorithm\n");
917 WARN_ON(local
->rate_ctrl
);
918 local
->rate_ctrl
= ref
;
920 wiphy_debug(local
->hw
.wiphy
, "Selected rate control algorithm '%s'\n",
926 void rate_control_deinitialize(struct ieee80211_local
*local
)
928 struct rate_control_ref
*ref
;
930 ref
= local
->rate_ctrl
;
935 local
->rate_ctrl
= NULL
;
936 rate_control_free(ref
);