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 < sizeof(mcs_mask); 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);