1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright 2002-2005, Instant802 Networks, Inc.
4 * Copyright 2005-2006, Devicescape Software, Inc.
5 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
6 * Copyright 2017 Intel Deutschland GmbH
9 #include <linux/kernel.h>
10 #include <linux/rtnetlink.h>
11 #include <linux/module.h>
12 #include <linux/slab.h>
14 #include "ieee80211_i.h"
17 struct rate_control_alg {
18 struct list_head list;
19 const struct rate_control_ops *ops;
22 static LIST_HEAD(rate_ctrl_algs);
23 static DEFINE_MUTEX(rate_ctrl_mutex);
25 static char *ieee80211_default_rc_algo = CONFIG_MAC80211_RC_DEFAULT;
26 module_param(ieee80211_default_rc_algo, charp, 0644);
27 MODULE_PARM_DESC(ieee80211_default_rc_algo,
28 "Default rate control algorithm for mac80211 to use");
30 void rate_control_rate_init(struct sta_info *sta)
32 struct ieee80211_local *local = sta->sdata->local;
33 struct rate_control_ref *ref = sta->rate_ctrl;
34 struct ieee80211_sta *ista = &sta->sta;
35 void *priv_sta = sta->rate_ctrl_priv;
36 struct ieee80211_supported_band *sband;
37 struct ieee80211_chanctx_conf *chanctx_conf;
39 ieee80211_sta_set_rx_nss(sta);
46 chanctx_conf = rcu_dereference(sta->sdata->vif.chanctx_conf);
47 if (WARN_ON(!chanctx_conf)) {
52 sband = local->hw.wiphy->bands[chanctx_conf->def.chan->band];
54 spin_lock_bh(&sta->rate_ctrl_lock);
55 ref->ops->rate_init(ref->priv, sband, &chanctx_conf->def, ista,
57 spin_unlock_bh(&sta->rate_ctrl_lock);
59 set_sta_flag(sta, WLAN_STA_RATE_CONTROL);
62 void rate_control_tx_status(struct ieee80211_local *local,
63 struct ieee80211_supported_band *sband,
64 struct ieee80211_tx_status *st)
66 struct rate_control_ref *ref = local->rate_ctrl;
67 struct sta_info *sta = container_of(st->sta, struct sta_info, sta);
68 void *priv_sta = sta->rate_ctrl_priv;
70 if (!ref || !test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
73 spin_lock_bh(&sta->rate_ctrl_lock);
74 if (ref->ops->tx_status_ext)
75 ref->ops->tx_status_ext(ref->priv, sband, priv_sta, st);
77 ref->ops->tx_status(ref->priv, sband, st->sta, priv_sta, st->skb);
81 spin_unlock_bh(&sta->rate_ctrl_lock);
84 void rate_control_rate_update(struct ieee80211_local *local,
85 struct ieee80211_supported_band *sband,
86 struct sta_info *sta, u32 changed)
88 struct rate_control_ref *ref = local->rate_ctrl;
89 struct ieee80211_sta *ista = &sta->sta;
90 void *priv_sta = sta->rate_ctrl_priv;
91 struct ieee80211_chanctx_conf *chanctx_conf;
93 if (ref && ref->ops->rate_update) {
96 chanctx_conf = rcu_dereference(sta->sdata->vif.chanctx_conf);
97 if (WARN_ON(!chanctx_conf)) {
102 spin_lock_bh(&sta->rate_ctrl_lock);
103 ref->ops->rate_update(ref->priv, sband, &chanctx_conf->def,
104 ista, priv_sta, changed);
105 spin_unlock_bh(&sta->rate_ctrl_lock);
108 drv_sta_rc_update(local, sta->sdata, &sta->sta, changed);
111 int ieee80211_rate_control_register(const struct rate_control_ops *ops)
113 struct rate_control_alg *alg;
118 mutex_lock(&rate_ctrl_mutex);
119 list_for_each_entry(alg, &rate_ctrl_algs, list) {
120 if (!strcmp(alg->ops->name, ops->name)) {
121 /* don't register an algorithm twice */
123 mutex_unlock(&rate_ctrl_mutex);
128 alg = kzalloc(sizeof(*alg), GFP_KERNEL);
130 mutex_unlock(&rate_ctrl_mutex);
135 list_add_tail(&alg->list, &rate_ctrl_algs);
136 mutex_unlock(&rate_ctrl_mutex);
140 EXPORT_SYMBOL(ieee80211_rate_control_register);
142 void ieee80211_rate_control_unregister(const struct rate_control_ops *ops)
144 struct rate_control_alg *alg;
146 mutex_lock(&rate_ctrl_mutex);
147 list_for_each_entry(alg, &rate_ctrl_algs, list) {
148 if (alg->ops == ops) {
149 list_del(&alg->list);
154 mutex_unlock(&rate_ctrl_mutex);
156 EXPORT_SYMBOL(ieee80211_rate_control_unregister);
158 static const struct rate_control_ops *
159 ieee80211_try_rate_control_ops_get(const char *name)
161 struct rate_control_alg *alg;
162 const struct rate_control_ops *ops = NULL;
167 mutex_lock(&rate_ctrl_mutex);
168 list_for_each_entry(alg, &rate_ctrl_algs, list) {
169 if (!strcmp(alg->ops->name, name)) {
174 mutex_unlock(&rate_ctrl_mutex);
178 /* Get the rate control algorithm. */
179 static const struct rate_control_ops *
180 ieee80211_rate_control_ops_get(const char *name)
182 const struct rate_control_ops *ops;
183 const char *alg_name;
185 kernel_param_lock(THIS_MODULE);
187 alg_name = ieee80211_default_rc_algo;
191 ops = ieee80211_try_rate_control_ops_get(alg_name);
193 /* try default if specific alg requested but not found */
194 ops = ieee80211_try_rate_control_ops_get(ieee80211_default_rc_algo);
196 /* Note: check for > 0 is intentional to avoid clang warning */
197 if (!ops && (strlen(CONFIG_MAC80211_RC_DEFAULT) > 0))
198 /* try built-in one if specific alg requested but not found */
199 ops = ieee80211_try_rate_control_ops_get(CONFIG_MAC80211_RC_DEFAULT);
201 kernel_param_unlock(THIS_MODULE);
206 #ifdef CONFIG_MAC80211_DEBUGFS
207 static ssize_t rcname_read(struct file *file, char __user *userbuf,
208 size_t count, loff_t *ppos)
210 struct rate_control_ref *ref = file->private_data;
211 int len = strlen(ref->ops->name);
213 return simple_read_from_buffer(userbuf, count, ppos,
214 ref->ops->name, len);
217 const struct file_operations rcname_ops = {
220 .llseek = default_llseek,
224 static struct rate_control_ref *
225 rate_control_alloc(const char *name, struct ieee80211_local *local)
227 struct rate_control_ref *ref;
229 ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL);
232 ref->ops = ieee80211_rate_control_ops_get(name);
236 ref->priv = ref->ops->alloc(&local->hw);
246 static void rate_control_free(struct ieee80211_local *local,
247 struct rate_control_ref *ctrl_ref)
249 ctrl_ref->ops->free(ctrl_ref->priv);
251 #ifdef CONFIG_MAC80211_DEBUGFS
252 debugfs_remove_recursive(local->debugfs.rcdir);
253 local->debugfs.rcdir = NULL;
259 void ieee80211_check_rate_mask(struct ieee80211_sub_if_data *sdata)
261 struct ieee80211_local *local = sdata->local;
262 struct ieee80211_supported_band *sband;
263 u32 user_mask, basic_rates = sdata->vif.bss_conf.basic_rates;
264 enum nl80211_band band;
266 if (WARN_ON(!sdata->vif.bss_conf.chandef.chan))
269 if (WARN_ON_ONCE(!basic_rates))
272 band = sdata->vif.bss_conf.chandef.chan->band;
273 user_mask = sdata->rc_rateidx_mask[band];
274 sband = local->hw.wiphy->bands[band];
276 if (user_mask & basic_rates)
280 "no overlap between basic rates (0x%x) and user mask (0x%x on band %d) - clearing the latter",
281 basic_rates, user_mask, band);
282 sdata->rc_rateidx_mask[band] = (1 << sband->n_bitrates) - 1;
285 static bool rc_no_data_or_no_ack_use_min(struct ieee80211_tx_rate_control *txrc)
287 struct sk_buff *skb = txrc->skb;
288 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
289 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
292 fc = hdr->frame_control;
294 return (info->flags & (IEEE80211_TX_CTL_NO_ACK |
295 IEEE80211_TX_CTL_USE_MINRATE)) ||
296 !ieee80211_is_data(fc);
299 static void rc_send_low_basicrate(s8 *idx, u32 basic_rates,
300 struct ieee80211_supported_band *sband)
304 if (basic_rates == 0)
305 return; /* assume basic rates unknown and accept rate */
308 if (basic_rates & (1 << *idx))
309 return; /* selected rate is a basic rate */
311 for (i = *idx + 1; i <= sband->n_bitrates; i++) {
312 if (basic_rates & (1 << i)) {
318 /* could not find a basic rate; use original selection */
321 static void __rate_control_send_low(struct ieee80211_hw *hw,
322 struct ieee80211_supported_band *sband,
323 struct ieee80211_sta *sta,
324 struct ieee80211_tx_info *info,
329 ieee80211_chandef_rate_flags(&hw->conf.chandef);
331 if ((sband->band == NL80211_BAND_2GHZ) &&
332 (info->flags & IEEE80211_TX_CTL_NO_CCK_RATE))
333 rate_flags |= IEEE80211_RATE_ERP_G;
335 info->control.rates[0].idx = 0;
336 for (i = 0; i < sband->n_bitrates; i++) {
337 if (!(rate_mask & BIT(i)))
340 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
343 if (!rate_supported(sta, sband->band, i))
346 info->control.rates[0].idx = i;
349 WARN_ONCE(i == sband->n_bitrates,
350 "no supported rates for sta %pM (0x%x, band %d) in rate_mask 0x%x with flags 0x%x\n",
351 sta ? sta->addr : NULL,
352 sta ? sta->supp_rates[sband->band] : -1,
354 rate_mask, rate_flags);
356 info->control.rates[0].count =
357 (info->flags & IEEE80211_TX_CTL_NO_ACK) ?
358 1 : hw->max_rate_tries;
360 info->control.skip_table = 1;
364 static bool rate_control_send_low(struct ieee80211_sta *pubsta,
365 struct ieee80211_tx_rate_control *txrc)
367 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
368 struct ieee80211_supported_band *sband = txrc->sband;
369 struct sta_info *sta;
371 bool use_basicrate = false;
373 if (!pubsta || rc_no_data_or_no_ack_use_min(txrc)) {
374 __rate_control_send_low(txrc->hw, sband, pubsta, info,
375 txrc->rate_idx_mask);
377 if (!pubsta && txrc->bss) {
378 mcast_rate = txrc->bss_conf->mcast_rate[sband->band];
379 if (mcast_rate > 0) {
380 info->control.rates[0].idx = mcast_rate - 1;
383 use_basicrate = true;
385 sta = container_of(pubsta, struct sta_info, sta);
386 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
387 use_basicrate = true;
391 rc_send_low_basicrate(&info->control.rates[0].idx,
392 txrc->bss_conf->basic_rates,
400 static bool rate_idx_match_legacy_mask(s8 *rate_idx, int n_bitrates, u32 mask)
404 /* See whether the selected rate or anything below it is allowed. */
405 for (j = *rate_idx; j >= 0; j--) {
406 if (mask & (1 << j)) {
407 /* Okay, found a suitable rate. Use it. */
413 /* Try to find a higher rate that would be allowed */
414 for (j = *rate_idx + 1; j < n_bitrates; j++) {
415 if (mask & (1 << j)) {
416 /* Okay, found a suitable rate. Use it. */
424 static bool rate_idx_match_mcs_mask(s8 *rate_idx, u8 *mcs_mask)
429 ridx = *rate_idx / 8;
430 rbit = *rate_idx % 8;
433 if (ridx < 0 || ridx >= IEEE80211_HT_MCS_MASK_LEN)
436 /* See whether the selected rate or anything below it is allowed. */
437 for (i = ridx; i >= 0; i--) {
438 for (j = rbit; j >= 0; j--)
439 if (mcs_mask[i] & BIT(j)) {
440 *rate_idx = i * 8 + j;
446 /* Try to find a higher rate that would be allowed */
447 ridx = (*rate_idx + 1) / 8;
448 rbit = (*rate_idx + 1) % 8;
450 for (i = ridx; i < IEEE80211_HT_MCS_MASK_LEN; i++) {
451 for (j = rbit; j < 8; j++)
452 if (mcs_mask[i] & BIT(j)) {
453 *rate_idx = i * 8 + j;
461 static bool rate_idx_match_vht_mcs_mask(s8 *rate_idx, u16 *vht_mask)
466 ridx = *rate_idx >> 4;
467 rbit = *rate_idx & 0xf;
469 if (ridx < 0 || ridx >= NL80211_VHT_NSS_MAX)
472 /* See whether the selected rate or anything below it is allowed. */
473 for (i = ridx; i >= 0; i--) {
474 for (j = rbit; j >= 0; j--) {
475 if (vht_mask[i] & BIT(j)) {
476 *rate_idx = (i << 4) | j;
483 /* Try to find a higher rate that would be allowed */
484 ridx = (*rate_idx + 1) >> 4;
485 rbit = (*rate_idx + 1) & 0xf;
487 for (i = ridx; i < NL80211_VHT_NSS_MAX; i++) {
488 for (j = rbit; j < 16; j++) {
489 if (vht_mask[i] & BIT(j)) {
490 *rate_idx = (i << 4) | j;
499 static void rate_idx_match_mask(s8 *rate_idx, u16 *rate_flags,
500 struct ieee80211_supported_band *sband,
501 enum nl80211_chan_width chan_width,
503 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN],
504 u16 vht_mask[NL80211_VHT_NSS_MAX])
506 if (*rate_flags & IEEE80211_TX_RC_VHT_MCS) {
507 /* handle VHT rates */
508 if (rate_idx_match_vht_mcs_mask(rate_idx, vht_mask))
512 /* keep protection flags */
513 *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS |
514 IEEE80211_TX_RC_USE_CTS_PROTECT |
515 IEEE80211_TX_RC_USE_SHORT_PREAMBLE);
517 *rate_flags |= IEEE80211_TX_RC_MCS;
518 if (chan_width == NL80211_CHAN_WIDTH_40)
519 *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
521 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask))
524 /* also try the legacy rates. */
525 *rate_flags &= ~(IEEE80211_TX_RC_MCS |
526 IEEE80211_TX_RC_40_MHZ_WIDTH);
527 if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates,
530 } else if (*rate_flags & IEEE80211_TX_RC_MCS) {
531 /* handle HT rates */
532 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask))
535 /* also try the legacy rates. */
537 /* keep protection flags */
538 *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS |
539 IEEE80211_TX_RC_USE_CTS_PROTECT |
540 IEEE80211_TX_RC_USE_SHORT_PREAMBLE);
541 if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates,
545 /* handle legacy rates */
546 if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates,
550 /* if HT BSS, and we handle a data frame, also try HT rates */
551 switch (chan_width) {
552 case NL80211_CHAN_WIDTH_20_NOHT:
553 case NL80211_CHAN_WIDTH_5:
554 case NL80211_CHAN_WIDTH_10:
561 /* keep protection flags */
562 *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS |
563 IEEE80211_TX_RC_USE_CTS_PROTECT |
564 IEEE80211_TX_RC_USE_SHORT_PREAMBLE);
566 *rate_flags |= IEEE80211_TX_RC_MCS;
568 if (chan_width == NL80211_CHAN_WIDTH_40)
569 *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
571 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask))
576 * Uh.. No suitable rate exists. This should not really happen with
577 * sane TX rate mask configurations. However, should someone manage to
578 * configure supported rates and TX rate mask in incompatible way,
579 * allow the frame to be transmitted with whatever the rate control
584 static void rate_fixup_ratelist(struct ieee80211_vif *vif,
585 struct ieee80211_supported_band *sband,
586 struct ieee80211_tx_info *info,
587 struct ieee80211_tx_rate *rates,
590 struct ieee80211_rate *rate;
595 * Set up the RTS/CTS rate as the fastest basic rate
596 * that is not faster than the data rate unless there
597 * is no basic rate slower than the data rate, in which
598 * case we pick the slowest basic rate
600 * XXX: Should this check all retry rates?
602 if (!(rates[0].flags &
603 (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))) {
604 u32 basic_rates = vif->bss_conf.basic_rates;
605 s8 baserate = basic_rates ? ffs(basic_rates) - 1 : 0;
607 rate = &sband->bitrates[rates[0].idx];
609 for (i = 0; i < sband->n_bitrates; i++) {
610 /* must be a basic rate */
611 if (!(basic_rates & BIT(i)))
613 /* must not be faster than the data rate */
614 if (sband->bitrates[i].bitrate > rate->bitrate)
617 if (sband->bitrates[baserate].bitrate <
618 sband->bitrates[i].bitrate)
622 info->control.rts_cts_rate_idx = baserate;
625 for (i = 0; i < max_rates; i++) {
627 * make sure there's no valid rate following
628 * an invalid one, just in case drivers don't
629 * take the API seriously to stop at -1.
635 if (rates[i].idx < 0) {
641 * For now assume MCS is already set up correctly, this
644 if (rates[i].flags & IEEE80211_TX_RC_MCS) {
645 WARN_ON(rates[i].idx > 76);
647 if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) &&
648 info->control.use_cts_prot)
650 IEEE80211_TX_RC_USE_CTS_PROTECT;
654 if (rates[i].flags & IEEE80211_TX_RC_VHT_MCS) {
655 WARN_ON(ieee80211_rate_get_vht_mcs(&rates[i]) > 9);
659 /* set up RTS protection if desired */
660 if (info->control.use_rts) {
661 rates[i].flags |= IEEE80211_TX_RC_USE_RTS_CTS;
662 info->control.use_cts_prot = false;
666 if (WARN_ON_ONCE(rates[i].idx >= sband->n_bitrates)) {
671 rate = &sband->bitrates[rates[i].idx];
673 /* set up short preamble */
674 if (info->control.short_preamble &&
675 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
676 rates[i].flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
678 /* set up G protection */
679 if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) &&
680 info->control.use_cts_prot &&
681 rate->flags & IEEE80211_RATE_ERP_G)
682 rates[i].flags |= IEEE80211_TX_RC_USE_CTS_PROTECT;
687 static void rate_control_fill_sta_table(struct ieee80211_sta *sta,
688 struct ieee80211_tx_info *info,
689 struct ieee80211_tx_rate *rates,
692 struct ieee80211_sta_rates *ratetbl = NULL;
695 if (sta && !info->control.skip_table)
696 ratetbl = rcu_dereference(sta->rates);
698 /* Fill remaining rate slots with data from the sta rate table. */
699 max_rates = min_t(int, max_rates, IEEE80211_TX_RATE_TABLE_SIZE);
700 for (i = 0; i < max_rates; i++) {
701 if (i < ARRAY_SIZE(info->control.rates) &&
702 info->control.rates[i].idx >= 0 &&
703 info->control.rates[i].count) {
704 if (rates != info->control.rates)
705 rates[i] = info->control.rates[i];
706 } else if (ratetbl) {
707 rates[i].idx = ratetbl->rate[i].idx;
708 rates[i].flags = ratetbl->rate[i].flags;
709 if (info->control.use_rts)
710 rates[i].count = ratetbl->rate[i].count_rts;
711 else if (info->control.use_cts_prot)
712 rates[i].count = ratetbl->rate[i].count_cts;
714 rates[i].count = ratetbl->rate[i].count;
720 if (rates[i].idx < 0 || !rates[i].count)
725 static bool rate_control_cap_mask(struct ieee80211_sub_if_data *sdata,
726 struct ieee80211_supported_band *sband,
727 struct ieee80211_sta *sta, u32 *mask,
728 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN],
729 u16 vht_mask[NL80211_VHT_NSS_MAX])
733 *mask = sdata->rc_rateidx_mask[sband->band];
734 flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
735 for (i = 0; i < sband->n_bitrates; i++) {
736 if ((flags & sband->bitrates[i].flags) != flags)
740 if (*mask == (1 << sband->n_bitrates) - 1 &&
741 !sdata->rc_has_mcs_mask[sband->band] &&
742 !sdata->rc_has_vht_mcs_mask[sband->band])
745 if (sdata->rc_has_mcs_mask[sband->band])
746 memcpy(mcs_mask, sdata->rc_rateidx_mcs_mask[sband->band],
747 IEEE80211_HT_MCS_MASK_LEN);
749 memset(mcs_mask, 0xff, IEEE80211_HT_MCS_MASK_LEN);
751 if (sdata->rc_has_vht_mcs_mask[sband->band])
752 memcpy(vht_mask, sdata->rc_rateidx_vht_mcs_mask[sband->band],
753 sizeof(u16) * NL80211_VHT_NSS_MAX);
755 memset(vht_mask, 0xff, sizeof(u16) * NL80211_VHT_NSS_MAX);
759 u16 sta_vht_mask[NL80211_VHT_NSS_MAX];
761 /* Filter out rates that the STA does not support */
762 *mask &= sta->supp_rates[sband->band];
763 for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++)
764 mcs_mask[i] &= sta->ht_cap.mcs.rx_mask[i];
766 sta_vht_cap = sta->vht_cap.vht_mcs.rx_mcs_map;
767 ieee80211_get_vht_mask_from_cap(sta_vht_cap, sta_vht_mask);
768 for (i = 0; i < NL80211_VHT_NSS_MAX; i++)
769 vht_mask[i] &= sta_vht_mask[i];
776 rate_control_apply_mask_ratetbl(struct sta_info *sta,
777 struct ieee80211_supported_band *sband,
778 struct ieee80211_sta_rates *rates)
782 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN];
783 u16 vht_mask[NL80211_VHT_NSS_MAX];
784 enum nl80211_chan_width chan_width;
786 if (!rate_control_cap_mask(sta->sdata, sband, &sta->sta, &mask,
790 chan_width = sta->sdata->vif.bss_conf.chandef.width;
791 for (i = 0; i < IEEE80211_TX_RATE_TABLE_SIZE; i++) {
792 if (rates->rate[i].idx < 0)
795 rate_idx_match_mask(&rates->rate[i].idx, &rates->rate[i].flags,
796 sband, chan_width, mask, mcs_mask,
801 static void rate_control_apply_mask(struct ieee80211_sub_if_data *sdata,
802 struct ieee80211_sta *sta,
803 struct ieee80211_supported_band *sband,
804 struct ieee80211_tx_rate *rates,
807 enum nl80211_chan_width chan_width;
808 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN];
810 u16 rate_flags, vht_mask[NL80211_VHT_NSS_MAX];
814 * Try to enforce the rateidx mask the user wanted. skip this if the
815 * default mask (allow all rates) is used to save some processing for
818 if (!rate_control_cap_mask(sdata, sband, sta, &mask, mcs_mask,
823 * Make sure the rate index selected for each TX rate is
824 * included in the configured mask and change the rate indexes
827 chan_width = sdata->vif.bss_conf.chandef.width;
828 for (i = 0; i < max_rates; i++) {
829 /* Skip invalid rates */
830 if (rates[i].idx < 0)
833 rate_flags = rates[i].flags;
834 rate_idx_match_mask(&rates[i].idx, &rate_flags, sband,
835 chan_width, mask, mcs_mask, vht_mask);
836 rates[i].flags = rate_flags;
840 void ieee80211_get_tx_rates(struct ieee80211_vif *vif,
841 struct ieee80211_sta *sta,
843 struct ieee80211_tx_rate *dest,
846 struct ieee80211_sub_if_data *sdata;
847 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
848 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
849 struct ieee80211_supported_band *sband;
851 rate_control_fill_sta_table(sta, info, dest, max_rates);
856 sdata = vif_to_sdata(vif);
857 sband = sdata->local->hw.wiphy->bands[info->band];
859 if (ieee80211_is_data(hdr->frame_control))
860 rate_control_apply_mask(sdata, sta, sband, dest, max_rates);
863 __rate_control_send_low(&sdata->local->hw, sband, sta, info,
864 sdata->rc_rateidx_mask[info->band]);
867 rate_fixup_ratelist(vif, sband, info, dest, max_rates);
869 EXPORT_SYMBOL(ieee80211_get_tx_rates);
871 void rate_control_get_rate(struct ieee80211_sub_if_data *sdata,
872 struct sta_info *sta,
873 struct ieee80211_tx_rate_control *txrc)
875 struct rate_control_ref *ref = sdata->local->rate_ctrl;
876 void *priv_sta = NULL;
877 struct ieee80211_sta *ista = NULL;
878 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
881 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
882 info->control.rates[i].idx = -1;
883 info->control.rates[i].flags = 0;
884 info->control.rates[i].count = 0;
887 if (rate_control_send_low(sta ? &sta->sta : NULL, txrc))
890 if (ieee80211_hw_check(&sdata->local->hw, HAS_RATE_CONTROL))
893 if (sta && test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) {
895 priv_sta = sta->rate_ctrl_priv;
899 spin_lock_bh(&sta->rate_ctrl_lock);
900 ref->ops->get_rate(ref->priv, ista, priv_sta, txrc);
901 spin_unlock_bh(&sta->rate_ctrl_lock);
903 rate_control_send_low(NULL, txrc);
906 if (ieee80211_hw_check(&sdata->local->hw, SUPPORTS_RC_TABLE))
909 ieee80211_get_tx_rates(&sdata->vif, ista, txrc->skb,
911 ARRAY_SIZE(info->control.rates));
914 int rate_control_set_rates(struct ieee80211_hw *hw,
915 struct ieee80211_sta *pubsta,
916 struct ieee80211_sta_rates *rates)
918 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
919 struct ieee80211_sta_rates *old;
920 struct ieee80211_supported_band *sband;
922 sband = ieee80211_get_sband(sta->sdata);
925 rate_control_apply_mask_ratetbl(sta, sband, rates);
927 * mac80211 guarantees that this function will not be called
928 * concurrently, so the following RCU access is safe, even without
929 * extra locking. This can not be checked easily, so we just set
930 * the condition to true.
932 old = rcu_dereference_protected(pubsta->rates, true);
933 rcu_assign_pointer(pubsta->rates, rates);
935 kfree_rcu(old, rcu_head);
937 drv_sta_rate_tbl_update(hw_to_local(hw), sta->sdata, pubsta);
939 ieee80211_sta_set_expected_throughput(pubsta, sta_get_expected_throughput(sta));
943 EXPORT_SYMBOL(rate_control_set_rates);
945 int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local,
948 struct rate_control_ref *ref;
952 if (local->open_count)
955 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
956 if (WARN_ON(!local->ops->set_rts_threshold))
961 ref = rate_control_alloc(name, local);
963 wiphy_warn(local->hw.wiphy,
964 "Failed to select rate control algorithm\n");
968 WARN_ON(local->rate_ctrl);
969 local->rate_ctrl = ref;
971 wiphy_debug(local->hw.wiphy, "Selected rate control algorithm '%s'\n",
977 void rate_control_deinitialize(struct ieee80211_local *local)
979 struct rate_control_ref *ref;
981 ref = local->rate_ctrl;
986 local->rate_ctrl = NULL;
987 rate_control_free(local, ref);