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Jiri Bencf0706e82007-05-05 11:45:53 -07001/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
Johannes Berge8e4f522017-03-08 11:12:10 +01005 * Copyright 2017 Intel Deutschland GmbH
Jiri Bencf0706e82007-05-05 11:45:53 -07006 *
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.
10 */
11
12#include <linux/kernel.h>
Johannes Bergff688082007-07-27 15:43:23 +020013#include <linux/rtnetlink.h>
Paul Gortmaker3a9a2312011-05-27 09:12:25 -040014#include <linux/module.h>
Johannes Bergcc01f9b2014-01-22 10:36:59 +010015#include <linux/slab.h>
Johannes Berg2c8dccc2008-04-08 15:14:40 -040016#include "rate.h"
Jiri Bencf0706e82007-05-05 11:45:53 -070017#include "ieee80211_i.h"
Johannes Berg4b7679a2008-09-18 18:14:18 +020018#include "debugfs.h"
Jiri Bencf0706e82007-05-05 11:45:53 -070019
20struct rate_control_alg {
21 struct list_head list;
Johannes Berg631ad702014-01-20 23:29:34 +010022 const struct rate_control_ops *ops;
Jiri Bencf0706e82007-05-05 11:45:53 -070023};
24
25static LIST_HEAD(rate_ctrl_algs);
26static DEFINE_MUTEX(rate_ctrl_mutex);
27
Stefano Brivioc21b39a2007-12-19 01:26:16 +010028static char *ieee80211_default_rc_algo = CONFIG_MAC80211_RC_DEFAULT;
29module_param(ieee80211_default_rc_algo, charp, 0644);
30MODULE_PARM_DESC(ieee80211_default_rc_algo,
31 "Default rate control algorithm for mac80211 to use");
32
Denys Vlasenkoeb6d9292015-07-15 14:56:06 +020033void rate_control_rate_init(struct sta_info *sta)
34{
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;
41
42 ieee80211_sta_set_rx_nss(sta);
43
44 if (!ref)
45 return;
46
47 rcu_read_lock();
48
49 chanctx_conf = rcu_dereference(sta->sdata->vif.chanctx_conf);
50 if (WARN_ON(!chanctx_conf)) {
51 rcu_read_unlock();
52 return;
53 }
54
55 sband = local->hw.wiphy->bands[chanctx_conf->def.chan->band];
56
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);
63}
64
Felix Fietkau18fb84d2017-04-26 17:11:35 +020065void rate_control_tx_status(struct ieee80211_local *local,
66 struct ieee80211_supported_band *sband,
67 struct ieee80211_tx_status *st)
68{
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;
72
73 if (!ref || !test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
74 return;
75
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);
83
84 spin_unlock_bh(&sta->rate_ctrl_lock);
85}
86
Denys Vlasenkoeb6d9292015-07-15 14:56:06 +020087void rate_control_rate_update(struct ieee80211_local *local,
88 struct ieee80211_supported_band *sband,
89 struct sta_info *sta, u32 changed)
90{
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;
95
96 if (ref && ref->ops->rate_update) {
97 rcu_read_lock();
98
99 chanctx_conf = rcu_dereference(sta->sdata->vif.chanctx_conf);
100 if (WARN_ON(!chanctx_conf)) {
101 rcu_read_unlock();
102 return;
103 }
104
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();
110 }
111 drv_sta_rc_update(local, sta->sdata, &sta->sta, changed);
112}
113
Johannes Berg631ad702014-01-20 23:29:34 +0100114int ieee80211_rate_control_register(const struct rate_control_ops *ops)
Jiri Bencf0706e82007-05-05 11:45:53 -0700115{
116 struct rate_control_alg *alg;
117
Johannes Bergac71c692007-10-28 14:17:44 +0100118 if (!ops->name)
119 return -EINVAL;
120
Johannes Berg999acd92007-10-28 14:49:33 +0100121 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);
Cyrill Gorcunovb808ab12007-12-13 15:52:11 -0800126 mutex_unlock(&rate_ctrl_mutex);
Johannes Berg999acd92007-10-28 14:49:33 +0100127 return -EALREADY;
128 }
129 }
130
Yoann Padioleaudd00cc42007-07-19 01:49:03 -0700131 alg = kzalloc(sizeof(*alg), GFP_KERNEL);
Jiri Bencf0706e82007-05-05 11:45:53 -0700132 if (alg == NULL) {
Johannes Berg999acd92007-10-28 14:49:33 +0100133 mutex_unlock(&rate_ctrl_mutex);
Jiri Bencf0706e82007-05-05 11:45:53 -0700134 return -ENOMEM;
135 }
Jiri Bencf0706e82007-05-05 11:45:53 -0700136 alg->ops = ops;
137
Jiri Bencf0706e82007-05-05 11:45:53 -0700138 list_add_tail(&alg->list, &rate_ctrl_algs);
139 mutex_unlock(&rate_ctrl_mutex);
140
141 return 0;
142}
143EXPORT_SYMBOL(ieee80211_rate_control_register);
144
Johannes Berg631ad702014-01-20 23:29:34 +0100145void ieee80211_rate_control_unregister(const struct rate_control_ops *ops)
Jiri Bencf0706e82007-05-05 11:45:53 -0700146{
147 struct rate_control_alg *alg;
148
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);
Cyrill Gorcunov20880e82007-12-13 16:17:03 -0800153 kfree(alg);
Jiri Bencf0706e82007-05-05 11:45:53 -0700154 break;
155 }
156 }
157 mutex_unlock(&rate_ctrl_mutex);
Jiri Bencf0706e82007-05-05 11:45:53 -0700158}
159EXPORT_SYMBOL(ieee80211_rate_control_unregister);
160
Johannes Berg631ad702014-01-20 23:29:34 +0100161static const struct rate_control_ops *
Jiri Bencf0706e82007-05-05 11:45:53 -0700162ieee80211_try_rate_control_ops_get(const char *name)
163{
164 struct rate_control_alg *alg;
Johannes Berg631ad702014-01-20 23:29:34 +0100165 const struct rate_control_ops *ops = NULL;
Jiri Bencf0706e82007-05-05 11:45:53 -0700166
Johannes Bergac71c692007-10-28 14:17:44 +0100167 if (!name)
168 return NULL;
169
Jiri Bencf0706e82007-05-05 11:45:53 -0700170 mutex_lock(&rate_ctrl_mutex);
171 list_for_each_entry(alg, &rate_ctrl_algs, list) {
Johannes Bergcc01f9b2014-01-22 10:36:59 +0100172 if (!strcmp(alg->ops->name, name)) {
173 ops = alg->ops;
174 break;
175 }
Jiri Bencf0706e82007-05-05 11:45:53 -0700176 }
177 mutex_unlock(&rate_ctrl_mutex);
178 return ops;
179}
180
Stefano Brivioc21b39a2007-12-19 01:26:16 +0100181/* Get the rate control algorithm. */
Johannes Berg631ad702014-01-20 23:29:34 +0100182static const struct rate_control_ops *
Jiri Bencf0706e82007-05-05 11:45:53 -0700183ieee80211_rate_control_ops_get(const char *name)
184{
Johannes Berg631ad702014-01-20 23:29:34 +0100185 const struct rate_control_ops *ops;
Stefano Brivioc21b39a2007-12-19 01:26:16 +0100186 const char *alg_name;
Jiri Bencf0706e82007-05-05 11:45:53 -0700187
Dan Streetmanb51d23e2015-06-17 06:18:52 +0930188 kernel_param_lock(THIS_MODULE);
Johannes Bergac71c692007-10-28 14:17:44 +0100189 if (!name)
Stefano Brivioc21b39a2007-12-19 01:26:16 +0100190 alg_name = ieee80211_default_rc_algo;
191 else
192 alg_name = name;
Johannes Bergac71c692007-10-28 14:17:44 +0100193
Stefano Brivioc21b39a2007-12-19 01:26:16 +0100194 ops = ieee80211_try_rate_control_ops_get(alg_name);
Stefano Brivioc21b39a2007-12-19 01:26:16 +0100195 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);
198
Matthias Kaehlcke93f56de2017-04-06 16:31:41 -0700199 /* 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 */
Johannes Berg4b475892008-01-02 15:17:03 +0100202 ops = ieee80211_try_rate_control_ops_get(CONFIG_MAC80211_RC_DEFAULT);
Matthias Kaehlcke93f56de2017-04-06 16:31:41 -0700203
Dan Streetmanb51d23e2015-06-17 06:18:52 +0930204 kernel_param_unlock(THIS_MODULE);
Johannes Berg4b475892008-01-02 15:17:03 +0100205
Jiri Bencf0706e82007-05-05 11:45:53 -0700206 return ops;
207}
208
Johannes Berg4b7679a2008-09-18 18:14:18 +0200209#ifdef CONFIG_MAC80211_DEBUGFS
210static ssize_t rcname_read(struct file *file, char __user *userbuf,
211 size_t count, loff_t *ppos)
212{
213 struct rate_control_ref *ref = file->private_data;
214 int len = strlen(ref->ops->name);
215
216 return simple_read_from_buffer(userbuf, count, ppos,
217 ref->ops->name, len);
218}
219
220static const struct file_operations rcname_ops = {
221 .read = rcname_read,
Stephen Boyd234e3402012-04-05 14:25:11 -0700222 .open = simple_open,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200223 .llseek = default_llseek,
Johannes Berg4b7679a2008-09-18 18:14:18 +0200224};
225#endif
226
Andres Salomon209c6712010-02-07 21:47:50 -0500227static struct rate_control_ref *rate_control_alloc(const char *name,
Jiri Bencf0706e82007-05-05 11:45:53 -0700228 struct ieee80211_local *local)
229{
Johannes Berg4b7679a2008-09-18 18:14:18 +0200230 struct dentry *debugfsdir = NULL;
Jiri Bencf0706e82007-05-05 11:45:53 -0700231 struct rate_control_ref *ref;
232
233 ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL);
234 if (!ref)
Johannes Bergcc01f9b2014-01-22 10:36:59 +0100235 return NULL;
Jiri Bencf0706e82007-05-05 11:45:53 -0700236 ref->ops = ieee80211_rate_control_ops_get(name);
237 if (!ref->ops)
Johannes Bergcc01f9b2014-01-22 10:36:59 +0100238 goto free;
Johannes Berg4b7679a2008-09-18 18:14:18 +0200239
240#ifdef CONFIG_MAC80211_DEBUGFS
241 debugfsdir = debugfs_create_dir("rc", local->hw.wiphy->debugfsdir);
242 local->debugfs.rcdir = debugfsdir;
Johannes Berg7bcfaf22009-10-27 12:59:03 +0100243 debugfs_create_file("name", 0400, debugfsdir, ref, &rcname_ops);
Johannes Berg4b7679a2008-09-18 18:14:18 +0200244#endif
245
246 ref->priv = ref->ops->alloc(&local->hw, debugfsdir);
Jiri Bencf0706e82007-05-05 11:45:53 -0700247 if (!ref->priv)
Johannes Bergcc01f9b2014-01-22 10:36:59 +0100248 goto free;
Jiri Bencf0706e82007-05-05 11:45:53 -0700249 return ref;
250
Johannes Bergcc01f9b2014-01-22 10:36:59 +0100251free:
Jiri Bencf0706e82007-05-05 11:45:53 -0700252 kfree(ref);
Jiri Bencf0706e82007-05-05 11:45:53 -0700253 return NULL;
254}
255
Johannes Berga8589582017-02-15 15:02:07 +0100256static void rate_control_free(struct ieee80211_local *local,
257 struct rate_control_ref *ctrl_ref)
Jiri Bencf0706e82007-05-05 11:45:53 -0700258{
Jiri Bencf0706e82007-05-05 11:45:53 -0700259 ctrl_ref->ops->free(ctrl_ref->priv);
Johannes Berg4b7679a2008-09-18 18:14:18 +0200260
261#ifdef CONFIG_MAC80211_DEBUGFS
Johannes Berga8589582017-02-15 15:02:07 +0100262 debugfs_remove_recursive(local->debugfs.rcdir);
263 local->debugfs.rcdir = NULL;
Johannes Berg4b7679a2008-09-18 18:14:18 +0200264#endif
265
Jiri Bencf0706e82007-05-05 11:45:53 -0700266 kfree(ctrl_ref);
267}
268
Johannes Berge8e4f522017-03-08 11:12:10 +0100269void ieee80211_check_rate_mask(struct ieee80211_sub_if_data *sdata)
270{
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;
275
276 if (WARN_ON(!sdata->vif.bss_conf.chandef.chan))
277 return;
278
279 if (WARN_ON_ONCE(!basic_rates))
280 return;
281
282 band = sdata->vif.bss_conf.chandef.chan->band;
283 user_mask = sdata->rc_rateidx_mask[band];
284 sband = local->hw.wiphy->bands[band];
285
286 if (user_mask & basic_rates)
287 return;
288
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;
293}
294
Rajkumar Manoharanb6f35302011-09-29 20:34:04 +0530295static bool rc_no_data_or_no_ack_use_min(struct ieee80211_tx_rate_control *txrc)
Luis R. Rodriguez4c6d4f52009-07-16 10:05:41 -0700296{
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;
301
302 fc = hdr->frame_control;
303
Rajkumar Manoharanb6f35302011-09-29 20:34:04 +0530304 return (info->flags & (IEEE80211_TX_CTL_NO_ACK |
305 IEEE80211_TX_CTL_USE_MINRATE)) ||
306 !ieee80211_is_data(fc);
Luis R. Rodriguez4c6d4f52009-07-16 10:05:41 -0700307}
308
Chun-Yeow Yeoh06703072013-08-06 15:39:56 -0700309static void rc_send_low_basicrate(s8 *idx, u32 basic_rates,
Felix Fietkau8f0729b2010-11-11 15:07:23 +0100310 struct ieee80211_supported_band *sband)
Jouni Malinene00cfce2009-12-29 12:59:19 +0200311{
312 u8 i;
313
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 */
320
Felix Fietkau8f0729b2010-11-11 15:07:23 +0100321 for (i = *idx + 1; i <= sband->n_bitrates; i++) {
Jouni Malinene00cfce2009-12-29 12:59:19 +0200322 if (basic_rates & (1 << i)) {
323 *idx = i;
324 return;
325 }
326 }
327
328 /* could not find a basic rate; use original selection */
329}
330
Felix Fietkau0d528d82013-04-22 16:14:41 +0200331static void __rate_control_send_low(struct ieee80211_hw *hw,
332 struct ieee80211_supported_band *sband,
333 struct ieee80211_sta *sta,
Andrei Otcheretianski1d2d3502013-10-14 11:04:28 +0200334 struct ieee80211_tx_info *info,
335 u32 rate_mask)
Felix Fietkau0d528d82013-04-22 16:14:41 +0200336{
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200337 int i;
338 u32 rate_flags =
339 ieee80211_chandef_rate_flags(&hw->conf.chandef);
340
Johannes Berg57fbcce2016-04-12 15:56:15 +0200341 if ((sband->band == NL80211_BAND_2GHZ) &&
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200342 (info->flags & IEEE80211_TX_CTL_NO_CCK_RATE))
343 rate_flags |= IEEE80211_RATE_ERP_G;
344
345 info->control.rates[0].idx = 0;
346 for (i = 0; i < sband->n_bitrates; i++) {
Andrei Otcheretianski1d2d3502013-10-14 11:04:28 +0200347 if (!(rate_mask & BIT(i)))
348 continue;
349
Andrei Otcheretianski1431fcb2013-10-14 10:46:55 +0200350 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
351 continue;
352
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200353 if (!rate_supported(sta, sband->band, i))
354 continue;
355
356 info->control.rates[0].idx = i;
357 break;
358 }
Johannes Berg0e5c3712015-09-23 14:02:47 +0200359 WARN_ONCE(i == sband->n_bitrates,
360 "no supported rates (0x%x) in rate_mask 0x%x with flags 0x%x\n",
Johannes Bergef95d8b2015-10-25 10:59:42 +0200361 sta ? sta->supp_rates[sband->band] : -1,
Johannes Berg0e5c3712015-09-23 14:02:47 +0200362 rate_mask, rate_flags);
Felix Fietkau0d528d82013-04-22 16:14:41 +0200363
364 info->control.rates[0].count =
365 (info->flags & IEEE80211_TX_CTL_NO_ACK) ?
366 1 : hw->max_rate_tries;
367
368 info->control.skip_table = 1;
369}
370
Rajkumar Manoharanaad14ce2011-09-25 14:53:31 +0530371
Chun-Yeow Yeoh06703072013-08-06 15:39:56 -0700372bool rate_control_send_low(struct ieee80211_sta *pubsta,
Luis R. Rodriguez4c6d4f52009-07-16 10:05:41 -0700373 void *priv_sta,
374 struct ieee80211_tx_rate_control *txrc)
375{
376 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
Felix Fietkaudd5b4cc2010-11-22 20:58:24 +0100377 struct ieee80211_supported_band *sband = txrc->sband;
Chun-Yeow Yeoh06703072013-08-06 15:39:56 -0700378 struct sta_info *sta;
Felix Fietkaudd5b4cc2010-11-22 20:58:24 +0100379 int mcast_rate;
Chun-Yeow Yeoh06703072013-08-06 15:39:56 -0700380 bool use_basicrate = false;
Luis R. Rodriguez4c6d4f52009-07-16 10:05:41 -0700381
Chun-Yeow Yeoh06703072013-08-06 15:39:56 -0700382 if (!pubsta || !priv_sta || rc_no_data_or_no_ack_use_min(txrc)) {
Andrei Otcheretianski1d2d3502013-10-14 11:04:28 +0200383 __rate_control_send_low(txrc->hw, sband, pubsta, info,
384 txrc->rate_idx_mask);
Felix Fietkau0d528d82013-04-22 16:14:41 +0200385
Chun-Yeow Yeoh06703072013-08-06 15:39:56 -0700386 if (!pubsta && txrc->bss) {
Felix Fietkaudd5b4cc2010-11-22 20:58:24 +0100387 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;
391 }
Chun-Yeow Yeoh06703072013-08-06 15:39:56 -0700392 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;
397 }
Felix Fietkaudd5b4cc2010-11-22 20:58:24 +0100398
Chun-Yeow Yeoh06703072013-08-06 15:39:56 -0700399 if (use_basicrate)
400 rc_send_low_basicrate(&info->control.rates[0].idx,
Jouni Malinene00cfce2009-12-29 12:59:19 +0200401 txrc->bss_conf->basic_rates,
Felix Fietkaudd5b4cc2010-11-22 20:58:24 +0100402 sband);
Chun-Yeow Yeoh06703072013-08-06 15:39:56 -0700403
Luis R. Rodriguez4c6d4f52009-07-16 10:05:41 -0700404 return true;
405 }
406 return false;
407}
408EXPORT_SYMBOL(rate_control_send_low);
409
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200410static bool rate_idx_match_legacy_mask(s8 *rate_idx, int n_bitrates, u32 mask)
Jouni Malinen37eb0b12010-01-06 13:09:08 +0200411{
412 int j;
413
414 /* See whether the selected rate or anything below it is allowed. */
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200415 for (j = *rate_idx; j >= 0; j--) {
Jouni Malinen37eb0b12010-01-06 13:09:08 +0200416 if (mask & (1 << j)) {
417 /* Okay, found a suitable rate. Use it. */
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200418 *rate_idx = j;
Simon Wunderlich19468412012-01-28 17:25:33 +0100419 return true;
Jouni Malinen37eb0b12010-01-06 13:09:08 +0200420 }
421 }
422
423 /* Try to find a higher rate that would be allowed */
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200424 for (j = *rate_idx + 1; j < n_bitrates; j++) {
Jouni Malinen37eb0b12010-01-06 13:09:08 +0200425 if (mask & (1 << j)) {
426 /* Okay, found a suitable rate. Use it. */
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200427 *rate_idx = j;
Simon Wunderlich19468412012-01-28 17:25:33 +0100428 return true;
429 }
430 }
431 return false;
432}
433
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200434static bool rate_idx_match_mcs_mask(s8 *rate_idx, u8 *mcs_mask)
Simon Wunderlich19468412012-01-28 17:25:33 +0100435{
436 int i, j;
437 int ridx, rbit;
438
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200439 ridx = *rate_idx / 8;
440 rbit = *rate_idx % 8;
Simon Wunderlich19468412012-01-28 17:25:33 +0100441
442 /* sanity check */
Dan Carpenter910570b52012-02-01 10:42:11 +0300443 if (ridx < 0 || ridx >= IEEE80211_HT_MCS_MASK_LEN)
Simon Wunderlich19468412012-01-28 17:25:33 +0100444 return false;
445
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)) {
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200450 *rate_idx = i * 8 + j;
Simon Wunderlich19468412012-01-28 17:25:33 +0100451 return true;
452 }
453 rbit = 7;
454 }
455
456 /* Try to find a higher rate that would be allowed */
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200457 ridx = (*rate_idx + 1) / 8;
458 rbit = (*rate_idx + 1) % 8;
Simon Wunderlich19468412012-01-28 17:25:33 +0100459
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)) {
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200463 *rate_idx = i * 8 + j;
Simon Wunderlich19468412012-01-28 17:25:33 +0100464 return true;
465 }
466 rbit = 0;
467 }
468 return false;
469}
470
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200471static bool rate_idx_match_vht_mcs_mask(s8 *rate_idx, u16 *vht_mask)
472{
473 int i, j;
474 int ridx, rbit;
Simon Wunderlich19468412012-01-28 17:25:33 +0100475
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200476 ridx = *rate_idx >> 4;
477 rbit = *rate_idx & 0xf;
478
479 if (ridx < 0 || ridx >= NL80211_VHT_NSS_MAX)
480 return false;
481
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;
488 }
489 }
490 rbit = 15;
491 }
492
493 /* Try to find a higher rate that would be allowed */
494 ridx = (*rate_idx + 1) >> 4;
495 rbit = (*rate_idx + 1) & 0xf;
496
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;
502 }
503 }
504 rbit = 0;
505 }
506 return false;
507}
Simon Wunderlich19468412012-01-28 17:25:33 +0100508
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200509static void rate_idx_match_mask(s8 *rate_idx, u16 *rate_flags,
Felix Fietkau0d528d82013-04-22 16:14:41 +0200510 struct ieee80211_supported_band *sband,
511 enum nl80211_chan_width chan_width,
Simon Wunderlich19468412012-01-28 17:25:33 +0100512 u32 mask,
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200513 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN],
514 u16 vht_mask[NL80211_VHT_NSS_MAX])
Simon Wunderlich19468412012-01-28 17:25:33 +0100515{
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200516 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;
520
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);
526
527 *rate_flags |= IEEE80211_TX_RC_MCS;
528 if (chan_width == NL80211_CHAN_WIDTH_40)
529 *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
530
531 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask))
532 return;
533
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 */
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200542 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask))
Simon Wunderlich19468412012-01-28 17:25:33 +0100543 return;
544
545 /* also try the legacy rates. */
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200546 *rate_idx = 0;
Simon Wunderlich19468412012-01-28 17:25:33 +0100547 /* keep protection flags */
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200548 *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))
Simon Wunderlich19468412012-01-28 17:25:33 +0100553 return;
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200554 } else {
Simon Wunderlich19468412012-01-28 17:25:33 +0100555 /* handle legacy rates */
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200556 if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates,
557 mask))
Simon Wunderlich19468412012-01-28 17:25:33 +0100558 return;
559
560 /* if HT BSS, and we handle a data frame, also try HT rates */
Simon Wunderlich0418a442013-05-16 13:00:31 +0200561 switch (chan_width) {
562 case NL80211_CHAN_WIDTH_20_NOHT:
563 case NL80211_CHAN_WIDTH_5:
564 case NL80211_CHAN_WIDTH_10:
Simon Wunderlich19468412012-01-28 17:25:33 +0100565 return;
Simon Wunderlich0418a442013-05-16 13:00:31 +0200566 default:
567 break;
568 }
Simon Wunderlich19468412012-01-28 17:25:33 +0100569
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200570 *rate_idx = 0;
Simon Wunderlich19468412012-01-28 17:25:33 +0100571 /* keep protection flags */
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200572 *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS |
573 IEEE80211_TX_RC_USE_CTS_PROTECT |
574 IEEE80211_TX_RC_USE_SHORT_PREAMBLE);
Simon Wunderlich19468412012-01-28 17:25:33 +0100575
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200576 *rate_flags |= IEEE80211_TX_RC_MCS;
Simon Wunderlich19468412012-01-28 17:25:33 +0100577
Felix Fietkau0d528d82013-04-22 16:14:41 +0200578 if (chan_width == NL80211_CHAN_WIDTH_40)
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200579 *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
Simon Wunderlich19468412012-01-28 17:25:33 +0100580
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200581 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask))
Jouni Malinen37eb0b12010-01-06 13:09:08 +0200582 return;
Jouni Malinen37eb0b12010-01-06 13:09:08 +0200583 }
584
585 /*
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.
591 */
592}
593
Felix Fietkau0d528d82013-04-22 16:14:41 +0200594static 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)
599{
600 struct ieee80211_rate *rate;
601 bool inval = false;
602 int i;
603
604 /*
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
609 *
610 * XXX: Should this check all retry rates?
611 */
Felix Fietkau336004e2014-11-21 23:29:14 +0100612 if (!(rates[0].flags &
613 (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))) {
Felix Fietkau0d528d82013-04-22 16:14:41 +0200614 u32 basic_rates = vif->bss_conf.basic_rates;
Karl Beldanc7abf252014-10-13 14:34:41 +0200615 s8 baserate = basic_rates ? ffs(basic_rates) - 1 : 0;
Felix Fietkau0d528d82013-04-22 16:14:41 +0200616
617 rate = &sband->bitrates[rates[0].idx];
618
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;
630 }
631
632 info->control.rts_cts_rate_idx = baserate;
633 }
634
635 for (i = 0; i < max_rates; i++) {
636 /*
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.
640 */
641 if (inval) {
642 rates[i].idx = -1;
643 continue;
644 }
645 if (rates[i].idx < 0) {
646 inval = true;
647 continue;
648 }
649
650 /*
651 * For now assume MCS is already set up correctly, this
652 * needs to be fixed.
653 */
654 if (rates[i].flags & IEEE80211_TX_RC_MCS) {
655 WARN_ON(rates[i].idx > 76);
656
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;
662 }
663
664 if (rates[i].flags & IEEE80211_TX_RC_VHT_MCS) {
665 WARN_ON(ieee80211_rate_get_vht_mcs(&rates[i]) > 9);
666 continue;
667 }
668
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;
673 }
674
675 /* RC is busted */
676 if (WARN_ON_ONCE(rates[i].idx >= sband->n_bitrates)) {
677 rates[i].idx = -1;
678 continue;
679 }
680
681 rate = &sband->bitrates[rates[i].idx];
682
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;
687
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;
693 }
694}
695
696
697static 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)
701{
702 struct ieee80211_sta_rates *ratetbl = NULL;
703 int i;
704
705 if (sta && !info->control.skip_table)
706 ratetbl = rcu_dereference(sta->rates);
707
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;
728 }
729
730 if (rates[i].idx < 0 || !rates[i].count)
731 break;
732 }
733}
734
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200735static bool rate_control_cap_mask(struct ieee80211_sub_if_data *sdata,
736 struct ieee80211_supported_band *sband,
737 struct ieee80211_sta *sta, u32 *mask,
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200738 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN],
739 u16 vht_mask[NL80211_VHT_NSS_MAX])
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200740{
741 u32 i, flags;
742
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);
748 }
749
750 if (*mask == (1 << sband->n_bitrates) - 1 &&
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200751 !sdata->rc_has_mcs_mask[sband->band] &&
752 !sdata->rc_has_vht_mcs_mask[sband->band])
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200753 return false;
754
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);
760
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200761 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);
766
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200767 if (sta) {
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200768 __le16 sta_vht_cap;
769 u16 sta_vht_mask[NL80211_VHT_NSS_MAX];
770
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200771 /* Filter out rates that the STA does not support */
772 *mask &= sta->supp_rates[sband->band];
Thierry Reding98a1f822015-08-26 12:22:14 +0200773 for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++)
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200774 mcs_mask[i] &= sta->ht_cap.mcs.rx_mask[i];
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200775
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];
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200780 }
781
782 return true;
783}
784
Lorenzo Bianconie9108672015-08-06 23:47:32 +0200785static void
786rate_control_apply_mask_ratetbl(struct sta_info *sta,
787 struct ieee80211_supported_band *sband,
788 struct ieee80211_sta_rates *rates)
789{
790 int i;
791 u32 mask;
792 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN];
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200793 u16 vht_mask[NL80211_VHT_NSS_MAX];
Lorenzo Bianconie9108672015-08-06 23:47:32 +0200794 enum nl80211_chan_width chan_width;
795
796 if (!rate_control_cap_mask(sta->sdata, sband, &sta->sta, &mask,
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200797 mcs_mask, vht_mask))
Lorenzo Bianconie9108672015-08-06 23:47:32 +0200798 return;
799
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;
804
805 rate_idx_match_mask(&rates->rate[i].idx, &rates->rate[i].flags,
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200806 sband, chan_width, mask, mcs_mask,
807 vht_mask);
Lorenzo Bianconie9108672015-08-06 23:47:32 +0200808 }
809}
810
Felix Fietkau0d528d82013-04-22 16:14:41 +0200811static void rate_control_apply_mask(struct ieee80211_sub_if_data *sdata,
812 struct ieee80211_sta *sta,
813 struct ieee80211_supported_band *sband,
Felix Fietkau0d528d82013-04-22 16:14:41 +0200814 struct ieee80211_tx_rate *rates,
815 int max_rates)
816{
817 enum nl80211_chan_width chan_width;
818 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN];
Felix Fietkau0d528d82013-04-22 16:14:41 +0200819 u32 mask;
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200820 u16 rate_flags, vht_mask[NL80211_VHT_NSS_MAX];
Felix Fietkau0d528d82013-04-22 16:14:41 +0200821 int i;
822
823 /*
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.
827 */
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200828 if (!rate_control_cap_mask(sdata, sband, sta, &mask, mcs_mask,
829 vht_mask))
Felix Fietkau0d528d82013-04-22 16:14:41 +0200830 return;
831
Felix Fietkau0d528d82013-04-22 16:14:41 +0200832 /*
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.
836 */
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;
842
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200843 rate_flags = rates[i].flags;
844 rate_idx_match_mask(&rates[i].idx, &rate_flags, sband,
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200845 chan_width, mask, mcs_mask, vht_mask);
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200846 rates[i].flags = rate_flags;
Felix Fietkau0d528d82013-04-22 16:14:41 +0200847 }
848}
849
850void 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)
855{
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;
860
861 rate_control_fill_sta_table(sta, info, dest, max_rates);
862
863 if (!vif)
864 return;
865
866 sdata = vif_to_sdata(vif);
867 sband = sdata->local->hw.wiphy->bands[info->band];
868
869 if (ieee80211_is_data(hdr->frame_control))
Lorenzo Bianconi35225eb2015-08-06 23:47:30 +0200870 rate_control_apply_mask(sdata, sta, sband, dest, max_rates);
Felix Fietkau0d528d82013-04-22 16:14:41 +0200871
872 if (dest[0].idx < 0)
Andrei Otcheretianski1d2d3502013-10-14 11:04:28 +0200873 __rate_control_send_low(&sdata->local->hw, sband, sta, info,
874 sdata->rc_rateidx_mask[info->band]);
Felix Fietkau0d528d82013-04-22 16:14:41 +0200875
876 if (sta)
877 rate_fixup_ratelist(vif, sband, info, dest, max_rates);
878}
879EXPORT_SYMBOL(ieee80211_get_tx_rates);
880
Johannes Berg4b7679a2008-09-18 18:14:18 +0200881void rate_control_get_rate(struct ieee80211_sub_if_data *sdata,
Johannes Berge6a98542008-10-21 12:40:02 +0200882 struct sta_info *sta,
883 struct ieee80211_tx_rate_control *txrc)
Mattias Nissler1abbe492007-12-20 13:50:07 +0100884{
Johannes Berg4b7679a2008-09-18 18:14:18 +0200885 struct rate_control_ref *ref = sdata->local->rate_ctrl;
886 void *priv_sta = NULL;
887 struct ieee80211_sta *ista = NULL;
Johannes Berge6a98542008-10-21 12:40:02 +0200888 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
Mattias Nissler1abbe492007-12-20 13:50:07 +0100889 int i;
Mattias Nissler1abbe492007-12-20 13:50:07 +0100890
Johannes Berge1936e92012-01-20 13:55:23 +0100891 if (sta && test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) {
Johannes Berg4b7679a2008-09-18 18:14:18 +0200892 ista = &sta->sta;
893 priv_sta = sta->rate_ctrl_priv;
894 }
895
Johannes Berge6a98542008-10-21 12:40:02 +0200896 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
897 info->control.rates[i].idx = -1;
898 info->control.rates[i].flags = 0;
Mohammed Shafi Shajakhan8617b092012-02-20 10:05:31 +0530899 info->control.rates[i].count = 0;
Mattias Nissler1abbe492007-12-20 13:50:07 +0100900 }
Johannes Berge6a98542008-10-21 12:40:02 +0200901
Johannes Berg30686bf2015-06-02 21:39:54 +0200902 if (ieee80211_hw_check(&sdata->local->hw, HAS_RATE_CONTROL))
Juuso Oikarinen5affcd62010-02-12 10:05:45 +0200903 return;
904
Johannes Berg35c347a2015-03-05 16:10:08 +0100905 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);
911 }
Johannes Berge6a98542008-10-21 12:40:02 +0200912
Johannes Berg30686bf2015-06-02 21:39:54 +0200913 if (ieee80211_hw_check(&sdata->local->hw, SUPPORTS_RC_TABLE))
Felix Fietkau0d528d82013-04-22 16:14:41 +0200914 return;
Felix Fietkau2ffbe6d2013-04-16 13:38:42 +0200915
Felix Fietkau0d528d82013-04-22 16:14:41 +0200916 ieee80211_get_tx_rates(&sdata->vif, ista, txrc->skb,
917 info->control.rates,
918 ARRAY_SIZE(info->control.rates));
Mattias Nissler1abbe492007-12-20 13:50:07 +0100919}
920
Felix Fietkau0d528d82013-04-22 16:14:41 +0200921int rate_control_set_rates(struct ieee80211_hw *hw,
922 struct ieee80211_sta *pubsta,
923 struct ieee80211_sta_rates *rates)
924{
Johannes Bergf815e2b2014-11-19 00:10:42 +0100925 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
Felix Fietkauf6b3d852013-05-03 10:01:03 +0200926 struct ieee80211_sta_rates *old;
Lorenzo Bianconie9108672015-08-06 23:47:32 +0200927 struct ieee80211_supported_band *sband;
Felix Fietkau0d528d82013-04-22 16:14:41 +0200928
Mohammed Shafi Shajakhan21a8e9d2017-04-27 12:45:38 +0530929 sband = ieee80211_get_sband(sta->sdata);
930 if (!sband)
931 return -EINVAL;
Lorenzo Bianconie9108672015-08-06 23:47:32 +0200932 rate_control_apply_mask_ratetbl(sta, sband, rates);
Felix Fietkauf6b3d852013-05-03 10:01:03 +0200933 /*
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.
938 */
939 old = rcu_dereference_protected(pubsta->rates, true);
Felix Fietkau0d528d82013-04-22 16:14:41 +0200940 rcu_assign_pointer(pubsta->rates, rates);
941 if (old)
942 kfree_rcu(old, rcu_head);
943
Johannes Bergf815e2b2014-11-19 00:10:42 +0100944 drv_sta_rate_tbl_update(hw_to_local(hw), sta->sdata, pubsta);
945
Felix Fietkau0d528d82013-04-22 16:14:41 +0200946 return 0;
947}
948EXPORT_SYMBOL(rate_control_set_rates);
949
Johannes Bergff688082007-07-27 15:43:23 +0200950int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local,
951 const char *name)
952{
Johannes Berg889cbb92012-01-17 10:33:29 +0100953 struct rate_control_ref *ref;
Johannes Bergff688082007-07-27 15:43:23 +0200954
955 ASSERT_RTNL();
Johannes Bergaf65cd962009-11-17 18:18:36 +0100956
Johannes Berg3b8d81e02009-06-17 17:43:56 +0200957 if (local->open_count)
Johannes Bergff688082007-07-27 15:43:23 +0200958 return -EBUSY;
959
Johannes Berg30686bf2015-06-02 21:39:54 +0200960 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
Johannes Bergaf65cd962009-11-17 18:18:36 +0100961 if (WARN_ON(!local->ops->set_rts_threshold))
962 return -EINVAL;
963 return 0;
964 }
965
Johannes Bergff688082007-07-27 15:43:23 +0200966 ref = rate_control_alloc(name, local);
967 if (!ref) {
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700968 wiphy_warn(local->hw.wiphy,
969 "Failed to select rate control algorithm\n");
Johannes Bergff688082007-07-27 15:43:23 +0200970 return -ENOENT;
971 }
972
Johannes Berg889cbb92012-01-17 10:33:29 +0100973 WARN_ON(local->rate_ctrl);
Johannes Bergff688082007-07-27 15:43:23 +0200974 local->rate_ctrl = ref;
Johannes Bergff688082007-07-27 15:43:23 +0200975
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700976 wiphy_debug(local->hw.wiphy, "Selected rate control algorithm '%s'\n",
977 ref->ops->name);
Johannes Bergff688082007-07-27 15:43:23 +0200978
Johannes Bergff688082007-07-27 15:43:23 +0200979 return 0;
980}
981
982void rate_control_deinitialize(struct ieee80211_local *local)
983{
984 struct rate_control_ref *ref;
985
986 ref = local->rate_ctrl;
Johannes Bergaf65cd962009-11-17 18:18:36 +0100987
988 if (!ref)
989 return;
990
Johannes Bergff688082007-07-27 15:43:23 +0200991 local->rate_ctrl = NULL;
Johannes Berga8589582017-02-15 15:02:07 +0100992 rate_control_free(local, ref);
Johannes Bergff688082007-07-27 15:43:23 +0200993}
Stefano Brivioc21b39a2007-12-19 01:26:16 +0100994