Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / net / mac80211 / rate.c
blob76f303fda3edaf15a98b4d159a6b455e1e8fbfc5
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2017 Intel Deutschland GmbH
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/kernel.h>
13 #include <linux/rtnetlink.h>
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include "rate.h"
17 #include "ieee80211_i.h"
18 #include "debugfs.h"
20 struct rate_control_alg {
21 struct list_head list;
22 const struct rate_control_ops *ops;
25 static LIST_HEAD(rate_ctrl_algs);
26 static DEFINE_MUTEX(rate_ctrl_mutex);
28 static char *ieee80211_default_rc_algo = CONFIG_MAC80211_RC_DEFAULT;
29 module_param(ieee80211_default_rc_algo, charp, 0644);
30 MODULE_PARM_DESC(ieee80211_default_rc_algo,
31 "Default rate control algorithm for mac80211 to use");
33 void rate_control_rate_init(struct sta_info *sta)
35 struct ieee80211_local *local = sta->sdata->local;
36 struct rate_control_ref *ref = sta->rate_ctrl;
37 struct ieee80211_sta *ista = &sta->sta;
38 void *priv_sta = sta->rate_ctrl_priv;
39 struct ieee80211_supported_band *sband;
40 struct ieee80211_chanctx_conf *chanctx_conf;
42 ieee80211_sta_set_rx_nss(sta);
44 if (!ref)
45 return;
47 rcu_read_lock();
49 chanctx_conf = rcu_dereference(sta->sdata->vif.chanctx_conf);
50 if (WARN_ON(!chanctx_conf)) {
51 rcu_read_unlock();
52 return;
55 sband = local->hw.wiphy->bands[chanctx_conf->def.chan->band];
57 spin_lock_bh(&sta->rate_ctrl_lock);
58 ref->ops->rate_init(ref->priv, sband, &chanctx_conf->def, ista,
59 priv_sta);
60 spin_unlock_bh(&sta->rate_ctrl_lock);
61 rcu_read_unlock();
62 set_sta_flag(sta, WLAN_STA_RATE_CONTROL);
65 void rate_control_tx_status(struct ieee80211_local *local,
66 struct ieee80211_supported_band *sband,
67 struct ieee80211_tx_status *st)
69 struct rate_control_ref *ref = local->rate_ctrl;
70 struct sta_info *sta = container_of(st->sta, struct sta_info, sta);
71 void *priv_sta = sta->rate_ctrl_priv;
73 if (!ref || !test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
74 return;
76 spin_lock_bh(&sta->rate_ctrl_lock);
77 if (ref->ops->tx_status_ext)
78 ref->ops->tx_status_ext(ref->priv, sband, priv_sta, st);
79 else if (st->skb)
80 ref->ops->tx_status(ref->priv, sband, st->sta, priv_sta, st->skb);
81 else
82 WARN_ON_ONCE(1);
84 spin_unlock_bh(&sta->rate_ctrl_lock);
87 void rate_control_rate_update(struct ieee80211_local *local,
88 struct ieee80211_supported_band *sband,
89 struct sta_info *sta, u32 changed)
91 struct rate_control_ref *ref = local->rate_ctrl;
92 struct ieee80211_sta *ista = &sta->sta;
93 void *priv_sta = sta->rate_ctrl_priv;
94 struct ieee80211_chanctx_conf *chanctx_conf;
96 if (ref && ref->ops->rate_update) {
97 rcu_read_lock();
99 chanctx_conf = rcu_dereference(sta->sdata->vif.chanctx_conf);
100 if (WARN_ON(!chanctx_conf)) {
101 rcu_read_unlock();
102 return;
105 spin_lock_bh(&sta->rate_ctrl_lock);
106 ref->ops->rate_update(ref->priv, sband, &chanctx_conf->def,
107 ista, priv_sta, changed);
108 spin_unlock_bh(&sta->rate_ctrl_lock);
109 rcu_read_unlock();
111 drv_sta_rc_update(local, sta->sdata, &sta->sta, changed);
114 int ieee80211_rate_control_register(const struct rate_control_ops *ops)
116 struct rate_control_alg *alg;
118 if (!ops->name)
119 return -EINVAL;
121 mutex_lock(&rate_ctrl_mutex);
122 list_for_each_entry(alg, &rate_ctrl_algs, list) {
123 if (!strcmp(alg->ops->name, ops->name)) {
124 /* don't register an algorithm twice */
125 WARN_ON(1);
126 mutex_unlock(&rate_ctrl_mutex);
127 return -EALREADY;
131 alg = kzalloc(sizeof(*alg), GFP_KERNEL);
132 if (alg == NULL) {
133 mutex_unlock(&rate_ctrl_mutex);
134 return -ENOMEM;
136 alg->ops = ops;
138 list_add_tail(&alg->list, &rate_ctrl_algs);
139 mutex_unlock(&rate_ctrl_mutex);
141 return 0;
143 EXPORT_SYMBOL(ieee80211_rate_control_register);
145 void ieee80211_rate_control_unregister(const struct rate_control_ops *ops)
147 struct rate_control_alg *alg;
149 mutex_lock(&rate_ctrl_mutex);
150 list_for_each_entry(alg, &rate_ctrl_algs, list) {
151 if (alg->ops == ops) {
152 list_del(&alg->list);
153 kfree(alg);
154 break;
157 mutex_unlock(&rate_ctrl_mutex);
159 EXPORT_SYMBOL(ieee80211_rate_control_unregister);
161 static const struct rate_control_ops *
162 ieee80211_try_rate_control_ops_get(const char *name)
164 struct rate_control_alg *alg;
165 const struct rate_control_ops *ops = NULL;
167 if (!name)
168 return NULL;
170 mutex_lock(&rate_ctrl_mutex);
171 list_for_each_entry(alg, &rate_ctrl_algs, list) {
172 if (!strcmp(alg->ops->name, name)) {
173 ops = alg->ops;
174 break;
177 mutex_unlock(&rate_ctrl_mutex);
178 return ops;
181 /* Get the rate control algorithm. */
182 static const struct rate_control_ops *
183 ieee80211_rate_control_ops_get(const char *name)
185 const struct rate_control_ops *ops;
186 const char *alg_name;
188 kernel_param_lock(THIS_MODULE);
189 if (!name)
190 alg_name = ieee80211_default_rc_algo;
191 else
192 alg_name = name;
194 ops = ieee80211_try_rate_control_ops_get(alg_name);
195 if (!ops && name)
196 /* try default if specific alg requested but not found */
197 ops = ieee80211_try_rate_control_ops_get(ieee80211_default_rc_algo);
199 /* Note: check for > 0 is intentional to avoid clang warning */
200 if (!ops && (strlen(CONFIG_MAC80211_RC_DEFAULT) > 0))
201 /* try built-in one if specific alg requested but not found */
202 ops = ieee80211_try_rate_control_ops_get(CONFIG_MAC80211_RC_DEFAULT);
204 kernel_param_unlock(THIS_MODULE);
206 return ops;
209 #ifdef CONFIG_MAC80211_DEBUGFS
210 static ssize_t rcname_read(struct file *file, char __user *userbuf,
211 size_t count, loff_t *ppos)
213 struct rate_control_ref *ref = file->private_data;
214 int len = strlen(ref->ops->name);
216 return simple_read_from_buffer(userbuf, count, ppos,
217 ref->ops->name, len);
220 static const struct file_operations rcname_ops = {
221 .read = rcname_read,
222 .open = simple_open,
223 .llseek = default_llseek,
225 #endif
227 static struct rate_control_ref *rate_control_alloc(const char *name,
228 struct ieee80211_local *local)
230 struct dentry *debugfsdir = NULL;
231 struct rate_control_ref *ref;
233 ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL);
234 if (!ref)
235 return NULL;
236 ref->ops = ieee80211_rate_control_ops_get(name);
237 if (!ref->ops)
238 goto free;
240 #ifdef CONFIG_MAC80211_DEBUGFS
241 debugfsdir = debugfs_create_dir("rc", local->hw.wiphy->debugfsdir);
242 local->debugfs.rcdir = debugfsdir;
243 debugfs_create_file("name", 0400, debugfsdir, ref, &rcname_ops);
244 #endif
246 ref->priv = ref->ops->alloc(&local->hw, debugfsdir);
247 if (!ref->priv)
248 goto free;
249 return ref;
251 free:
252 kfree(ref);
253 return NULL;
256 static void rate_control_free(struct ieee80211_local *local,
257 struct rate_control_ref *ctrl_ref)
259 ctrl_ref->ops->free(ctrl_ref->priv);
261 #ifdef CONFIG_MAC80211_DEBUGFS
262 debugfs_remove_recursive(local->debugfs.rcdir);
263 local->debugfs.rcdir = NULL;
264 #endif
266 kfree(ctrl_ref);
269 void ieee80211_check_rate_mask(struct ieee80211_sub_if_data *sdata)
271 struct ieee80211_local *local = sdata->local;
272 struct ieee80211_supported_band *sband;
273 u32 user_mask, basic_rates = sdata->vif.bss_conf.basic_rates;
274 enum nl80211_band band;
276 if (WARN_ON(!sdata->vif.bss_conf.chandef.chan))
277 return;
279 if (WARN_ON_ONCE(!basic_rates))
280 return;
282 band = sdata->vif.bss_conf.chandef.chan->band;
283 user_mask = sdata->rc_rateidx_mask[band];
284 sband = local->hw.wiphy->bands[band];
286 if (user_mask & basic_rates)
287 return;
289 sdata_dbg(sdata,
290 "no overlap between basic rates (0x%x) and user mask (0x%x on band %d) - clearing the latter",
291 basic_rates, user_mask, band);
292 sdata->rc_rateidx_mask[band] = (1 << sband->n_bitrates) - 1;
295 static bool rc_no_data_or_no_ack_use_min(struct ieee80211_tx_rate_control *txrc)
297 struct sk_buff *skb = txrc->skb;
298 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
299 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
300 __le16 fc;
302 fc = hdr->frame_control;
304 return (info->flags & (IEEE80211_TX_CTL_NO_ACK |
305 IEEE80211_TX_CTL_USE_MINRATE)) ||
306 !ieee80211_is_data(fc);
309 static void rc_send_low_basicrate(s8 *idx, u32 basic_rates,
310 struct ieee80211_supported_band *sband)
312 u8 i;
314 if (basic_rates == 0)
315 return; /* assume basic rates unknown and accept rate */
316 if (*idx < 0)
317 return;
318 if (basic_rates & (1 << *idx))
319 return; /* selected rate is a basic rate */
321 for (i = *idx + 1; i <= sband->n_bitrates; i++) {
322 if (basic_rates & (1 << i)) {
323 *idx = i;
324 return;
328 /* could not find a basic rate; use original selection */
331 static void __rate_control_send_low(struct ieee80211_hw *hw,
332 struct ieee80211_supported_band *sband,
333 struct ieee80211_sta *sta,
334 struct ieee80211_tx_info *info,
335 u32 rate_mask)
337 int i;
338 u32 rate_flags =
339 ieee80211_chandef_rate_flags(&hw->conf.chandef);
341 if ((sband->band == NL80211_BAND_2GHZ) &&
342 (info->flags & IEEE80211_TX_CTL_NO_CCK_RATE))
343 rate_flags |= IEEE80211_RATE_ERP_G;
345 info->control.rates[0].idx = 0;
346 for (i = 0; i < sband->n_bitrates; i++) {
347 if (!(rate_mask & BIT(i)))
348 continue;
350 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
351 continue;
353 if (!rate_supported(sta, sband->band, i))
354 continue;
356 info->control.rates[0].idx = i;
357 break;
359 WARN_ONCE(i == sband->n_bitrates,
360 "no supported rates (0x%x) in rate_mask 0x%x with flags 0x%x\n",
361 sta ? sta->supp_rates[sband->band] : -1,
362 rate_mask, rate_flags);
364 info->control.rates[0].count =
365 (info->flags & IEEE80211_TX_CTL_NO_ACK) ?
366 1 : hw->max_rate_tries;
368 info->control.skip_table = 1;
372 bool rate_control_send_low(struct ieee80211_sta *pubsta,
373 void *priv_sta,
374 struct ieee80211_tx_rate_control *txrc)
376 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
377 struct ieee80211_supported_band *sband = txrc->sband;
378 struct sta_info *sta;
379 int mcast_rate;
380 bool use_basicrate = false;
382 if (!pubsta || !priv_sta || rc_no_data_or_no_ack_use_min(txrc)) {
383 __rate_control_send_low(txrc->hw, sband, pubsta, info,
384 txrc->rate_idx_mask);
386 if (!pubsta && txrc->bss) {
387 mcast_rate = txrc->bss_conf->mcast_rate[sband->band];
388 if (mcast_rate > 0) {
389 info->control.rates[0].idx = mcast_rate - 1;
390 return true;
392 use_basicrate = true;
393 } else if (pubsta) {
394 sta = container_of(pubsta, struct sta_info, sta);
395 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
396 use_basicrate = true;
399 if (use_basicrate)
400 rc_send_low_basicrate(&info->control.rates[0].idx,
401 txrc->bss_conf->basic_rates,
402 sband);
404 return true;
406 return false;
408 EXPORT_SYMBOL(rate_control_send_low);
410 static bool rate_idx_match_legacy_mask(s8 *rate_idx, int n_bitrates, u32 mask)
412 int j;
414 /* See whether the selected rate or anything below it is allowed. */
415 for (j = *rate_idx; j >= 0; j--) {
416 if (mask & (1 << j)) {
417 /* Okay, found a suitable rate. Use it. */
418 *rate_idx = j;
419 return true;
423 /* Try to find a higher rate that would be allowed */
424 for (j = *rate_idx + 1; j < n_bitrates; j++) {
425 if (mask & (1 << j)) {
426 /* Okay, found a suitable rate. Use it. */
427 *rate_idx = j;
428 return true;
431 return false;
434 static bool rate_idx_match_mcs_mask(s8 *rate_idx, u8 *mcs_mask)
436 int i, j;
437 int ridx, rbit;
439 ridx = *rate_idx / 8;
440 rbit = *rate_idx % 8;
442 /* sanity check */
443 if (ridx < 0 || ridx >= IEEE80211_HT_MCS_MASK_LEN)
444 return false;
446 /* See whether the selected rate or anything below it is allowed. */
447 for (i = ridx; i >= 0; i--) {
448 for (j = rbit; j >= 0; j--)
449 if (mcs_mask[i] & BIT(j)) {
450 *rate_idx = i * 8 + j;
451 return true;
453 rbit = 7;
456 /* Try to find a higher rate that would be allowed */
457 ridx = (*rate_idx + 1) / 8;
458 rbit = (*rate_idx + 1) % 8;
460 for (i = ridx; i < IEEE80211_HT_MCS_MASK_LEN; i++) {
461 for (j = rbit; j < 8; j++)
462 if (mcs_mask[i] & BIT(j)) {
463 *rate_idx = i * 8 + j;
464 return true;
466 rbit = 0;
468 return false;
471 static bool rate_idx_match_vht_mcs_mask(s8 *rate_idx, u16 *vht_mask)
473 int i, j;
474 int ridx, rbit;
476 ridx = *rate_idx >> 4;
477 rbit = *rate_idx & 0xf;
479 if (ridx < 0 || ridx >= NL80211_VHT_NSS_MAX)
480 return false;
482 /* See whether the selected rate or anything below it is allowed. */
483 for (i = ridx; i >= 0; i--) {
484 for (j = rbit; j >= 0; j--) {
485 if (vht_mask[i] & BIT(j)) {
486 *rate_idx = (i << 4) | j;
487 return true;
490 rbit = 15;
493 /* Try to find a higher rate that would be allowed */
494 ridx = (*rate_idx + 1) >> 4;
495 rbit = (*rate_idx + 1) & 0xf;
497 for (i = ridx; i < NL80211_VHT_NSS_MAX; i++) {
498 for (j = rbit; j < 16; j++) {
499 if (vht_mask[i] & BIT(j)) {
500 *rate_idx = (i << 4) | j;
501 return true;
504 rbit = 0;
506 return false;
509 static void rate_idx_match_mask(s8 *rate_idx, u16 *rate_flags,
510 struct ieee80211_supported_band *sband,
511 enum nl80211_chan_width chan_width,
512 u32 mask,
513 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN],
514 u16 vht_mask[NL80211_VHT_NSS_MAX])
516 if (*rate_flags & IEEE80211_TX_RC_VHT_MCS) {
517 /* handle VHT rates */
518 if (rate_idx_match_vht_mcs_mask(rate_idx, vht_mask))
519 return;
521 *rate_idx = 0;
522 /* keep protection flags */
523 *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS |
524 IEEE80211_TX_RC_USE_CTS_PROTECT |
525 IEEE80211_TX_RC_USE_SHORT_PREAMBLE);
527 *rate_flags |= IEEE80211_TX_RC_MCS;
528 if (chan_width == NL80211_CHAN_WIDTH_40)
529 *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
531 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask))
532 return;
534 /* also try the legacy rates. */
535 *rate_flags &= ~(IEEE80211_TX_RC_MCS |
536 IEEE80211_TX_RC_40_MHZ_WIDTH);
537 if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates,
538 mask))
539 return;
540 } else if (*rate_flags & IEEE80211_TX_RC_MCS) {
541 /* handle HT rates */
542 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask))
543 return;
545 /* also try the legacy rates. */
546 *rate_idx = 0;
547 /* keep protection flags */
548 *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS |
549 IEEE80211_TX_RC_USE_CTS_PROTECT |
550 IEEE80211_TX_RC_USE_SHORT_PREAMBLE);
551 if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates,
552 mask))
553 return;
554 } else {
555 /* handle legacy rates */
556 if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates,
557 mask))
558 return;
560 /* if HT BSS, and we handle a data frame, also try HT rates */
561 switch (chan_width) {
562 case NL80211_CHAN_WIDTH_20_NOHT:
563 case NL80211_CHAN_WIDTH_5:
564 case NL80211_CHAN_WIDTH_10:
565 return;
566 default:
567 break;
570 *rate_idx = 0;
571 /* keep protection flags */
572 *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS |
573 IEEE80211_TX_RC_USE_CTS_PROTECT |
574 IEEE80211_TX_RC_USE_SHORT_PREAMBLE);
576 *rate_flags |= IEEE80211_TX_RC_MCS;
578 if (chan_width == NL80211_CHAN_WIDTH_40)
579 *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
581 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask))
582 return;
586 * Uh.. No suitable rate exists. This should not really happen with
587 * sane TX rate mask configurations. However, should someone manage to
588 * configure supported rates and TX rate mask in incompatible way,
589 * allow the frame to be transmitted with whatever the rate control
590 * selected.
594 static void rate_fixup_ratelist(struct ieee80211_vif *vif,
595 struct ieee80211_supported_band *sband,
596 struct ieee80211_tx_info *info,
597 struct ieee80211_tx_rate *rates,
598 int max_rates)
600 struct ieee80211_rate *rate;
601 bool inval = false;
602 int i;
605 * Set up the RTS/CTS rate as the fastest basic rate
606 * that is not faster than the data rate unless there
607 * is no basic rate slower than the data rate, in which
608 * case we pick the slowest basic rate
610 * XXX: Should this check all retry rates?
612 if (!(rates[0].flags &
613 (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))) {
614 u32 basic_rates = vif->bss_conf.basic_rates;
615 s8 baserate = basic_rates ? ffs(basic_rates) - 1 : 0;
617 rate = &sband->bitrates[rates[0].idx];
619 for (i = 0; i < sband->n_bitrates; i++) {
620 /* must be a basic rate */
621 if (!(basic_rates & BIT(i)))
622 continue;
623 /* must not be faster than the data rate */
624 if (sband->bitrates[i].bitrate > rate->bitrate)
625 continue;
626 /* maximum */
627 if (sband->bitrates[baserate].bitrate <
628 sband->bitrates[i].bitrate)
629 baserate = i;
632 info->control.rts_cts_rate_idx = baserate;
635 for (i = 0; i < max_rates; i++) {
637 * make sure there's no valid rate following
638 * an invalid one, just in case drivers don't
639 * take the API seriously to stop at -1.
641 if (inval) {
642 rates[i].idx = -1;
643 continue;
645 if (rates[i].idx < 0) {
646 inval = true;
647 continue;
651 * For now assume MCS is already set up correctly, this
652 * needs to be fixed.
654 if (rates[i].flags & IEEE80211_TX_RC_MCS) {
655 WARN_ON(rates[i].idx > 76);
657 if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) &&
658 info->control.use_cts_prot)
659 rates[i].flags |=
660 IEEE80211_TX_RC_USE_CTS_PROTECT;
661 continue;
664 if (rates[i].flags & IEEE80211_TX_RC_VHT_MCS) {
665 WARN_ON(ieee80211_rate_get_vht_mcs(&rates[i]) > 9);
666 continue;
669 /* set up RTS protection if desired */
670 if (info->control.use_rts) {
671 rates[i].flags |= IEEE80211_TX_RC_USE_RTS_CTS;
672 info->control.use_cts_prot = false;
675 /* RC is busted */
676 if (WARN_ON_ONCE(rates[i].idx >= sband->n_bitrates)) {
677 rates[i].idx = -1;
678 continue;
681 rate = &sband->bitrates[rates[i].idx];
683 /* set up short preamble */
684 if (info->control.short_preamble &&
685 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
686 rates[i].flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
688 /* set up G protection */
689 if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) &&
690 info->control.use_cts_prot &&
691 rate->flags & IEEE80211_RATE_ERP_G)
692 rates[i].flags |= IEEE80211_TX_RC_USE_CTS_PROTECT;
697 static void rate_control_fill_sta_table(struct ieee80211_sta *sta,
698 struct ieee80211_tx_info *info,
699 struct ieee80211_tx_rate *rates,
700 int max_rates)
702 struct ieee80211_sta_rates *ratetbl = NULL;
703 int i;
705 if (sta && !info->control.skip_table)
706 ratetbl = rcu_dereference(sta->rates);
708 /* Fill remaining rate slots with data from the sta rate table. */
709 max_rates = min_t(int, max_rates, IEEE80211_TX_RATE_TABLE_SIZE);
710 for (i = 0; i < max_rates; i++) {
711 if (i < ARRAY_SIZE(info->control.rates) &&
712 info->control.rates[i].idx >= 0 &&
713 info->control.rates[i].count) {
714 if (rates != info->control.rates)
715 rates[i] = info->control.rates[i];
716 } else if (ratetbl) {
717 rates[i].idx = ratetbl->rate[i].idx;
718 rates[i].flags = ratetbl->rate[i].flags;
719 if (info->control.use_rts)
720 rates[i].count = ratetbl->rate[i].count_rts;
721 else if (info->control.use_cts_prot)
722 rates[i].count = ratetbl->rate[i].count_cts;
723 else
724 rates[i].count = ratetbl->rate[i].count;
725 } else {
726 rates[i].idx = -1;
727 rates[i].count = 0;
730 if (rates[i].idx < 0 || !rates[i].count)
731 break;
735 static bool rate_control_cap_mask(struct ieee80211_sub_if_data *sdata,
736 struct ieee80211_supported_band *sband,
737 struct ieee80211_sta *sta, u32 *mask,
738 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN],
739 u16 vht_mask[NL80211_VHT_NSS_MAX])
741 u32 i, flags;
743 *mask = sdata->rc_rateidx_mask[sband->band];
744 flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
745 for (i = 0; i < sband->n_bitrates; i++) {
746 if ((flags & sband->bitrates[i].flags) != flags)
747 *mask &= ~BIT(i);
750 if (*mask == (1 << sband->n_bitrates) - 1 &&
751 !sdata->rc_has_mcs_mask[sband->band] &&
752 !sdata->rc_has_vht_mcs_mask[sband->band])
753 return false;
755 if (sdata->rc_has_mcs_mask[sband->band])
756 memcpy(mcs_mask, sdata->rc_rateidx_mcs_mask[sband->band],
757 IEEE80211_HT_MCS_MASK_LEN);
758 else
759 memset(mcs_mask, 0xff, IEEE80211_HT_MCS_MASK_LEN);
761 if (sdata->rc_has_vht_mcs_mask[sband->band])
762 memcpy(vht_mask, sdata->rc_rateidx_vht_mcs_mask[sband->band],
763 sizeof(u16) * NL80211_VHT_NSS_MAX);
764 else
765 memset(vht_mask, 0xff, sizeof(u16) * NL80211_VHT_NSS_MAX);
767 if (sta) {
768 __le16 sta_vht_cap;
769 u16 sta_vht_mask[NL80211_VHT_NSS_MAX];
771 /* Filter out rates that the STA does not support */
772 *mask &= sta->supp_rates[sband->band];
773 for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++)
774 mcs_mask[i] &= sta->ht_cap.mcs.rx_mask[i];
776 sta_vht_cap = sta->vht_cap.vht_mcs.rx_mcs_map;
777 ieee80211_get_vht_mask_from_cap(sta_vht_cap, sta_vht_mask);
778 for (i = 0; i < NL80211_VHT_NSS_MAX; i++)
779 vht_mask[i] &= sta_vht_mask[i];
782 return true;
785 static void
786 rate_control_apply_mask_ratetbl(struct sta_info *sta,
787 struct ieee80211_supported_band *sband,
788 struct ieee80211_sta_rates *rates)
790 int i;
791 u32 mask;
792 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN];
793 u16 vht_mask[NL80211_VHT_NSS_MAX];
794 enum nl80211_chan_width chan_width;
796 if (!rate_control_cap_mask(sta->sdata, sband, &sta->sta, &mask,
797 mcs_mask, vht_mask))
798 return;
800 chan_width = sta->sdata->vif.bss_conf.chandef.width;
801 for (i = 0; i < IEEE80211_TX_RATE_TABLE_SIZE; i++) {
802 if (rates->rate[i].idx < 0)
803 break;
805 rate_idx_match_mask(&rates->rate[i].idx, &rates->rate[i].flags,
806 sband, chan_width, mask, mcs_mask,
807 vht_mask);
811 static void rate_control_apply_mask(struct ieee80211_sub_if_data *sdata,
812 struct ieee80211_sta *sta,
813 struct ieee80211_supported_band *sband,
814 struct ieee80211_tx_rate *rates,
815 int max_rates)
817 enum nl80211_chan_width chan_width;
818 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN];
819 u32 mask;
820 u16 rate_flags, vht_mask[NL80211_VHT_NSS_MAX];
821 int i;
824 * Try to enforce the rateidx mask the user wanted. skip this if the
825 * default mask (allow all rates) is used to save some processing for
826 * the common case.
828 if (!rate_control_cap_mask(sdata, sband, sta, &mask, mcs_mask,
829 vht_mask))
830 return;
833 * Make sure the rate index selected for each TX rate is
834 * included in the configured mask and change the rate indexes
835 * if needed.
837 chan_width = sdata->vif.bss_conf.chandef.width;
838 for (i = 0; i < max_rates; i++) {
839 /* Skip invalid rates */
840 if (rates[i].idx < 0)
841 break;
843 rate_flags = rates[i].flags;
844 rate_idx_match_mask(&rates[i].idx, &rate_flags, sband,
845 chan_width, mask, mcs_mask, vht_mask);
846 rates[i].flags = rate_flags;
850 void ieee80211_get_tx_rates(struct ieee80211_vif *vif,
851 struct ieee80211_sta *sta,
852 struct sk_buff *skb,
853 struct ieee80211_tx_rate *dest,
854 int max_rates)
856 struct ieee80211_sub_if_data *sdata;
857 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
858 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
859 struct ieee80211_supported_band *sband;
861 rate_control_fill_sta_table(sta, info, dest, max_rates);
863 if (!vif)
864 return;
866 sdata = vif_to_sdata(vif);
867 sband = sdata->local->hw.wiphy->bands[info->band];
869 if (ieee80211_is_data(hdr->frame_control))
870 rate_control_apply_mask(sdata, sta, sband, dest, max_rates);
872 if (dest[0].idx < 0)
873 __rate_control_send_low(&sdata->local->hw, sband, sta, info,
874 sdata->rc_rateidx_mask[info->band]);
876 if (sta)
877 rate_fixup_ratelist(vif, sband, info, dest, max_rates);
879 EXPORT_SYMBOL(ieee80211_get_tx_rates);
881 void rate_control_get_rate(struct ieee80211_sub_if_data *sdata,
882 struct sta_info *sta,
883 struct ieee80211_tx_rate_control *txrc)
885 struct rate_control_ref *ref = sdata->local->rate_ctrl;
886 void *priv_sta = NULL;
887 struct ieee80211_sta *ista = NULL;
888 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
889 int i;
891 if (sta && test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) {
892 ista = &sta->sta;
893 priv_sta = sta->rate_ctrl_priv;
896 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
897 info->control.rates[i].idx = -1;
898 info->control.rates[i].flags = 0;
899 info->control.rates[i].count = 0;
902 if (ieee80211_hw_check(&sdata->local->hw, HAS_RATE_CONTROL))
903 return;
905 if (ista) {
906 spin_lock_bh(&sta->rate_ctrl_lock);
907 ref->ops->get_rate(ref->priv, ista, priv_sta, txrc);
908 spin_unlock_bh(&sta->rate_ctrl_lock);
909 } else {
910 ref->ops->get_rate(ref->priv, NULL, NULL, txrc);
913 if (ieee80211_hw_check(&sdata->local->hw, SUPPORTS_RC_TABLE))
914 return;
916 ieee80211_get_tx_rates(&sdata->vif, ista, txrc->skb,
917 info->control.rates,
918 ARRAY_SIZE(info->control.rates));
921 int rate_control_set_rates(struct ieee80211_hw *hw,
922 struct ieee80211_sta *pubsta,
923 struct ieee80211_sta_rates *rates)
925 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
926 struct ieee80211_sta_rates *old;
927 struct ieee80211_supported_band *sband;
929 sband = ieee80211_get_sband(sta->sdata);
930 if (!sband)
931 return -EINVAL;
932 rate_control_apply_mask_ratetbl(sta, sband, rates);
934 * mac80211 guarantees that this function will not be called
935 * concurrently, so the following RCU access is safe, even without
936 * extra locking. This can not be checked easily, so we just set
937 * the condition to true.
939 old = rcu_dereference_protected(pubsta->rates, true);
940 rcu_assign_pointer(pubsta->rates, rates);
941 if (old)
942 kfree_rcu(old, rcu_head);
944 drv_sta_rate_tbl_update(hw_to_local(hw), sta->sdata, pubsta);
946 ieee80211_sta_set_expected_throughput(pubsta, sta_get_expected_throughput(sta));
948 return 0;
950 EXPORT_SYMBOL(rate_control_set_rates);
952 int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local,
953 const char *name)
955 struct rate_control_ref *ref;
957 ASSERT_RTNL();
959 if (local->open_count)
960 return -EBUSY;
962 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
963 if (WARN_ON(!local->ops->set_rts_threshold))
964 return -EINVAL;
965 return 0;
968 ref = rate_control_alloc(name, local);
969 if (!ref) {
970 wiphy_warn(local->hw.wiphy,
971 "Failed to select rate control algorithm\n");
972 return -ENOENT;
975 WARN_ON(local->rate_ctrl);
976 local->rate_ctrl = ref;
978 wiphy_debug(local->hw.wiphy, "Selected rate control algorithm '%s'\n",
979 ref->ops->name);
981 return 0;
984 void rate_control_deinitialize(struct ieee80211_local *local)
986 struct rate_control_ref *ref;
988 ref = local->rate_ctrl;
990 if (!ref)
991 return;
993 local->rate_ctrl = NULL;
994 rate_control_free(local, ref);