blob: 9ce8883d5f449ed438f0a4a4a4807ede153c6725 [file] [log] [blame]
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>
5 *
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.
9 */
10
11#include <linux/kernel.h>
Johannes Bergff688082007-07-27 15:43:23 +020012#include <linux/rtnetlink.h>
Paul Gortmaker3a9a2312011-05-27 09:12:25 -040013#include <linux/module.h>
Johannes Bergcc01f9b2014-01-22 10:36:59 +010014#include <linux/slab.h>
Johannes Berg2c8dccc2008-04-08 15:14:40 -040015#include "rate.h"
Jiri Bencf0706e82007-05-05 11:45:53 -070016#include "ieee80211_i.h"
Johannes Berg4b7679a2008-09-18 18:14:18 +020017#include "debugfs.h"
Jiri Bencf0706e82007-05-05 11:45:53 -070018
19struct rate_control_alg {
20 struct list_head list;
Johannes Berg631ad702014-01-20 23:29:34 +010021 const struct rate_control_ops *ops;
Jiri Bencf0706e82007-05-05 11:45:53 -070022};
23
24static LIST_HEAD(rate_ctrl_algs);
25static DEFINE_MUTEX(rate_ctrl_mutex);
26
Stefano Brivioc21b39a2007-12-19 01:26:16 +010027static char *ieee80211_default_rc_algo = CONFIG_MAC80211_RC_DEFAULT;
28module_param(ieee80211_default_rc_algo, charp, 0644);
29MODULE_PARM_DESC(ieee80211_default_rc_algo,
30 "Default rate control algorithm for mac80211 to use");
31
Denys Vlasenkoeb6d9292015-07-15 14:56:06 +020032void rate_control_rate_init(struct sta_info *sta)
33{
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;
40
41 ieee80211_sta_set_rx_nss(sta);
42
43 if (!ref)
44 return;
45
46 rcu_read_lock();
47
48 chanctx_conf = rcu_dereference(sta->sdata->vif.chanctx_conf);
49 if (WARN_ON(!chanctx_conf)) {
50 rcu_read_unlock();
51 return;
52 }
53
54 sband = local->hw.wiphy->bands[chanctx_conf->def.chan->band];
55
56 spin_lock_bh(&sta->rate_ctrl_lock);
57 ref->ops->rate_init(ref->priv, sband, &chanctx_conf->def, ista,
58 priv_sta);
59 spin_unlock_bh(&sta->rate_ctrl_lock);
60 rcu_read_unlock();
61 set_sta_flag(sta, WLAN_STA_RATE_CONTROL);
62}
63
64void rate_control_rate_update(struct ieee80211_local *local,
65 struct ieee80211_supported_band *sband,
66 struct sta_info *sta, u32 changed)
67{
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;
72
73 if (ref && ref->ops->rate_update) {
74 rcu_read_lock();
75
76 chanctx_conf = rcu_dereference(sta->sdata->vif.chanctx_conf);
77 if (WARN_ON(!chanctx_conf)) {
78 rcu_read_unlock();
79 return;
80 }
81
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);
86 rcu_read_unlock();
87 }
88 drv_sta_rc_update(local, sta->sdata, &sta->sta, changed);
89}
90
Johannes Berg631ad702014-01-20 23:29:34 +010091int ieee80211_rate_control_register(const struct rate_control_ops *ops)
Jiri Bencf0706e82007-05-05 11:45:53 -070092{
93 struct rate_control_alg *alg;
94
Johannes Bergac71c692007-10-28 14:17:44 +010095 if (!ops->name)
96 return -EINVAL;
97
Johannes Berg999acd92007-10-28 14:49:33 +010098 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 */
102 WARN_ON(1);
Cyrill Gorcunovb808ab12007-12-13 15:52:11 -0800103 mutex_unlock(&rate_ctrl_mutex);
Johannes Berg999acd92007-10-28 14:49:33 +0100104 return -EALREADY;
105 }
106 }
107
Yoann Padioleaudd00cc42007-07-19 01:49:03 -0700108 alg = kzalloc(sizeof(*alg), GFP_KERNEL);
Jiri Bencf0706e82007-05-05 11:45:53 -0700109 if (alg == NULL) {
Johannes Berg999acd92007-10-28 14:49:33 +0100110 mutex_unlock(&rate_ctrl_mutex);
Jiri Bencf0706e82007-05-05 11:45:53 -0700111 return -ENOMEM;
112 }
Jiri Bencf0706e82007-05-05 11:45:53 -0700113 alg->ops = ops;
114
Jiri Bencf0706e82007-05-05 11:45:53 -0700115 list_add_tail(&alg->list, &rate_ctrl_algs);
116 mutex_unlock(&rate_ctrl_mutex);
117
118 return 0;
119}
120EXPORT_SYMBOL(ieee80211_rate_control_register);
121
Johannes Berg631ad702014-01-20 23:29:34 +0100122void ieee80211_rate_control_unregister(const struct rate_control_ops *ops)
Jiri Bencf0706e82007-05-05 11:45:53 -0700123{
124 struct rate_control_alg *alg;
125
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);
Cyrill Gorcunov20880e82007-12-13 16:17:03 -0800130 kfree(alg);
Jiri Bencf0706e82007-05-05 11:45:53 -0700131 break;
132 }
133 }
134 mutex_unlock(&rate_ctrl_mutex);
Jiri Bencf0706e82007-05-05 11:45:53 -0700135}
136EXPORT_SYMBOL(ieee80211_rate_control_unregister);
137
Johannes Berg631ad702014-01-20 23:29:34 +0100138static const struct rate_control_ops *
Jiri Bencf0706e82007-05-05 11:45:53 -0700139ieee80211_try_rate_control_ops_get(const char *name)
140{
141 struct rate_control_alg *alg;
Johannes Berg631ad702014-01-20 23:29:34 +0100142 const struct rate_control_ops *ops = NULL;
Jiri Bencf0706e82007-05-05 11:45:53 -0700143
Johannes Bergac71c692007-10-28 14:17:44 +0100144 if (!name)
145 return NULL;
146
Jiri Bencf0706e82007-05-05 11:45:53 -0700147 mutex_lock(&rate_ctrl_mutex);
148 list_for_each_entry(alg, &rate_ctrl_algs, list) {
Johannes Bergcc01f9b2014-01-22 10:36:59 +0100149 if (!strcmp(alg->ops->name, name)) {
150 ops = alg->ops;
151 break;
152 }
Jiri Bencf0706e82007-05-05 11:45:53 -0700153 }
154 mutex_unlock(&rate_ctrl_mutex);
155 return ops;
156}
157
Stefano Brivioc21b39a2007-12-19 01:26:16 +0100158/* Get the rate control algorithm. */
Johannes Berg631ad702014-01-20 23:29:34 +0100159static const struct rate_control_ops *
Jiri Bencf0706e82007-05-05 11:45:53 -0700160ieee80211_rate_control_ops_get(const char *name)
161{
Johannes Berg631ad702014-01-20 23:29:34 +0100162 const struct rate_control_ops *ops;
Stefano Brivioc21b39a2007-12-19 01:26:16 +0100163 const char *alg_name;
Jiri Bencf0706e82007-05-05 11:45:53 -0700164
Dan Streetmanb51d23e2015-06-17 06:18:52 +0930165 kernel_param_lock(THIS_MODULE);
Johannes Bergac71c692007-10-28 14:17:44 +0100166 if (!name)
Stefano Brivioc21b39a2007-12-19 01:26:16 +0100167 alg_name = ieee80211_default_rc_algo;
168 else
169 alg_name = name;
Johannes Bergac71c692007-10-28 14:17:44 +0100170
Stefano Brivioc21b39a2007-12-19 01:26:16 +0100171 ops = ieee80211_try_rate_control_ops_get(alg_name);
Stefano Brivioc21b39a2007-12-19 01:26:16 +0100172 if (!ops && name)
173 /* try default if specific alg requested but not found */
174 ops = ieee80211_try_rate_control_ops_get(ieee80211_default_rc_algo);
175
Johannes Berg4b475892008-01-02 15:17:03 +0100176 /* 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);
Dan Streetmanb51d23e2015-06-17 06:18:52 +0930179 kernel_param_unlock(THIS_MODULE);
Johannes Berg4b475892008-01-02 15:17:03 +0100180
Jiri Bencf0706e82007-05-05 11:45:53 -0700181 return ops;
182}
183
Johannes Berg4b7679a2008-09-18 18:14:18 +0200184#ifdef CONFIG_MAC80211_DEBUGFS
185static ssize_t rcname_read(struct file *file, char __user *userbuf,
186 size_t count, loff_t *ppos)
187{
188 struct rate_control_ref *ref = file->private_data;
189 int len = strlen(ref->ops->name);
190
191 return simple_read_from_buffer(userbuf, count, ppos,
192 ref->ops->name, len);
193}
194
195static const struct file_operations rcname_ops = {
196 .read = rcname_read,
Stephen Boyd234e3402012-04-05 14:25:11 -0700197 .open = simple_open,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200198 .llseek = default_llseek,
Johannes Berg4b7679a2008-09-18 18:14:18 +0200199};
200#endif
201
Andres Salomon209c6712010-02-07 21:47:50 -0500202static struct rate_control_ref *rate_control_alloc(const char *name,
Jiri Bencf0706e82007-05-05 11:45:53 -0700203 struct ieee80211_local *local)
204{
Johannes Berg4b7679a2008-09-18 18:14:18 +0200205 struct dentry *debugfsdir = NULL;
Jiri Bencf0706e82007-05-05 11:45:53 -0700206 struct rate_control_ref *ref;
207
208 ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL);
209 if (!ref)
Johannes Bergcc01f9b2014-01-22 10:36:59 +0100210 return NULL;
Johannes Berg4b7679a2008-09-18 18:14:18 +0200211 ref->local = local;
Jiri Bencf0706e82007-05-05 11:45:53 -0700212 ref->ops = ieee80211_rate_control_ops_get(name);
213 if (!ref->ops)
Johannes Bergcc01f9b2014-01-22 10:36:59 +0100214 goto free;
Johannes Berg4b7679a2008-09-18 18:14:18 +0200215
216#ifdef CONFIG_MAC80211_DEBUGFS
217 debugfsdir = debugfs_create_dir("rc", local->hw.wiphy->debugfsdir);
218 local->debugfs.rcdir = debugfsdir;
Johannes Berg7bcfaf22009-10-27 12:59:03 +0100219 debugfs_create_file("name", 0400, debugfsdir, ref, &rcname_ops);
Johannes Berg4b7679a2008-09-18 18:14:18 +0200220#endif
221
222 ref->priv = ref->ops->alloc(&local->hw, debugfsdir);
Jiri Bencf0706e82007-05-05 11:45:53 -0700223 if (!ref->priv)
Johannes Bergcc01f9b2014-01-22 10:36:59 +0100224 goto free;
Jiri Bencf0706e82007-05-05 11:45:53 -0700225 return ref;
226
Johannes Bergcc01f9b2014-01-22 10:36:59 +0100227free:
Jiri Bencf0706e82007-05-05 11:45:53 -0700228 kfree(ref);
Jiri Bencf0706e82007-05-05 11:45:53 -0700229 return NULL;
230}
231
Johannes Berg889cbb92012-01-17 10:33:29 +0100232static void rate_control_free(struct rate_control_ref *ctrl_ref)
Jiri Bencf0706e82007-05-05 11:45:53 -0700233{
Jiri Bencf0706e82007-05-05 11:45:53 -0700234 ctrl_ref->ops->free(ctrl_ref->priv);
Johannes Berg4b7679a2008-09-18 18:14:18 +0200235
236#ifdef CONFIG_MAC80211_DEBUGFS
Johannes Berg7bcfaf22009-10-27 12:59:03 +0100237 debugfs_remove_recursive(ctrl_ref->local->debugfs.rcdir);
Johannes Berg4b7679a2008-09-18 18:14:18 +0200238 ctrl_ref->local->debugfs.rcdir = NULL;
239#endif
240
Jiri Bencf0706e82007-05-05 11:45:53 -0700241 kfree(ctrl_ref);
242}
243
Rajkumar Manoharanb6f35302011-09-29 20:34:04 +0530244static bool rc_no_data_or_no_ack_use_min(struct ieee80211_tx_rate_control *txrc)
Luis R. Rodriguez4c6d4f52009-07-16 10:05:41 -0700245{
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);
249 __le16 fc;
250
251 fc = hdr->frame_control;
252
Rajkumar Manoharanb6f35302011-09-29 20:34:04 +0530253 return (info->flags & (IEEE80211_TX_CTL_NO_ACK |
254 IEEE80211_TX_CTL_USE_MINRATE)) ||
255 !ieee80211_is_data(fc);
Luis R. Rodriguez4c6d4f52009-07-16 10:05:41 -0700256}
257
Chun-Yeow Yeoh06703072013-08-06 15:39:56 -0700258static void rc_send_low_basicrate(s8 *idx, u32 basic_rates,
Felix Fietkau8f0729b2010-11-11 15:07:23 +0100259 struct ieee80211_supported_band *sband)
Jouni Malinene00cfce2009-12-29 12:59:19 +0200260{
261 u8 i;
262
263 if (basic_rates == 0)
264 return; /* assume basic rates unknown and accept rate */
265 if (*idx < 0)
266 return;
267 if (basic_rates & (1 << *idx))
268 return; /* selected rate is a basic rate */
269
Felix Fietkau8f0729b2010-11-11 15:07:23 +0100270 for (i = *idx + 1; i <= sband->n_bitrates; i++) {
Jouni Malinene00cfce2009-12-29 12:59:19 +0200271 if (basic_rates & (1 << i)) {
272 *idx = i;
273 return;
274 }
275 }
276
277 /* could not find a basic rate; use original selection */
278}
279
Felix Fietkau0d528d82013-04-22 16:14:41 +0200280static void __rate_control_send_low(struct ieee80211_hw *hw,
281 struct ieee80211_supported_band *sband,
282 struct ieee80211_sta *sta,
Andrei Otcheretianski1d2d3502013-10-14 11:04:28 +0200283 struct ieee80211_tx_info *info,
284 u32 rate_mask)
Felix Fietkau0d528d82013-04-22 16:14:41 +0200285{
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200286 int i;
287 u32 rate_flags =
288 ieee80211_chandef_rate_flags(&hw->conf.chandef);
289
290 if ((sband->band == IEEE80211_BAND_2GHZ) &&
291 (info->flags & IEEE80211_TX_CTL_NO_CCK_RATE))
292 rate_flags |= IEEE80211_RATE_ERP_G;
293
294 info->control.rates[0].idx = 0;
295 for (i = 0; i < sband->n_bitrates; i++) {
Andrei Otcheretianski1d2d3502013-10-14 11:04:28 +0200296 if (!(rate_mask & BIT(i)))
297 continue;
298
Andrei Otcheretianski1431fcb2013-10-14 10:46:55 +0200299 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
300 continue;
301
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200302 if (!rate_supported(sta, sband->band, i))
303 continue;
304
305 info->control.rates[0].idx = i;
306 break;
307 }
308 WARN_ON_ONCE(i == sband->n_bitrates);
Felix Fietkau0d528d82013-04-22 16:14:41 +0200309
310 info->control.rates[0].count =
311 (info->flags & IEEE80211_TX_CTL_NO_ACK) ?
312 1 : hw->max_rate_tries;
313
314 info->control.skip_table = 1;
315}
316
Rajkumar Manoharanaad14ce2011-09-25 14:53:31 +0530317
Chun-Yeow Yeoh06703072013-08-06 15:39:56 -0700318bool rate_control_send_low(struct ieee80211_sta *pubsta,
Luis R. Rodriguez4c6d4f52009-07-16 10:05:41 -0700319 void *priv_sta,
320 struct ieee80211_tx_rate_control *txrc)
321{
322 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
Felix Fietkaudd5b4cc2010-11-22 20:58:24 +0100323 struct ieee80211_supported_band *sband = txrc->sband;
Chun-Yeow Yeoh06703072013-08-06 15:39:56 -0700324 struct sta_info *sta;
Felix Fietkaudd5b4cc2010-11-22 20:58:24 +0100325 int mcast_rate;
Chun-Yeow Yeoh06703072013-08-06 15:39:56 -0700326 bool use_basicrate = false;
Luis R. Rodriguez4c6d4f52009-07-16 10:05:41 -0700327
Chun-Yeow Yeoh06703072013-08-06 15:39:56 -0700328 if (!pubsta || !priv_sta || rc_no_data_or_no_ack_use_min(txrc)) {
Andrei Otcheretianski1d2d3502013-10-14 11:04:28 +0200329 __rate_control_send_low(txrc->hw, sband, pubsta, info,
330 txrc->rate_idx_mask);
Felix Fietkau0d528d82013-04-22 16:14:41 +0200331
Chun-Yeow Yeoh06703072013-08-06 15:39:56 -0700332 if (!pubsta && txrc->bss) {
Felix Fietkaudd5b4cc2010-11-22 20:58:24 +0100333 mcast_rate = txrc->bss_conf->mcast_rate[sband->band];
334 if (mcast_rate > 0) {
335 info->control.rates[0].idx = mcast_rate - 1;
336 return true;
337 }
Chun-Yeow Yeoh06703072013-08-06 15:39:56 -0700338 use_basicrate = true;
339 } else if (pubsta) {
340 sta = container_of(pubsta, struct sta_info, sta);
341 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
342 use_basicrate = true;
343 }
Felix Fietkaudd5b4cc2010-11-22 20:58:24 +0100344
Chun-Yeow Yeoh06703072013-08-06 15:39:56 -0700345 if (use_basicrate)
346 rc_send_low_basicrate(&info->control.rates[0].idx,
Jouni Malinene00cfce2009-12-29 12:59:19 +0200347 txrc->bss_conf->basic_rates,
Felix Fietkaudd5b4cc2010-11-22 20:58:24 +0100348 sband);
Chun-Yeow Yeoh06703072013-08-06 15:39:56 -0700349
Luis R. Rodriguez4c6d4f52009-07-16 10:05:41 -0700350 return true;
351 }
352 return false;
353}
354EXPORT_SYMBOL(rate_control_send_low);
355
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200356static bool rate_idx_match_legacy_mask(s8 *rate_idx, int n_bitrates, u32 mask)
Jouni Malinen37eb0b12010-01-06 13:09:08 +0200357{
358 int j;
359
360 /* See whether the selected rate or anything below it is allowed. */
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200361 for (j = *rate_idx; j >= 0; j--) {
Jouni Malinen37eb0b12010-01-06 13:09:08 +0200362 if (mask & (1 << j)) {
363 /* Okay, found a suitable rate. Use it. */
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200364 *rate_idx = j;
Simon Wunderlich19468412012-01-28 17:25:33 +0100365 return true;
Jouni Malinen37eb0b12010-01-06 13:09:08 +0200366 }
367 }
368
369 /* Try to find a higher rate that would be allowed */
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200370 for (j = *rate_idx + 1; j < n_bitrates; j++) {
Jouni Malinen37eb0b12010-01-06 13:09:08 +0200371 if (mask & (1 << j)) {
372 /* Okay, found a suitable rate. Use it. */
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200373 *rate_idx = j;
Simon Wunderlich19468412012-01-28 17:25:33 +0100374 return true;
375 }
376 }
377 return false;
378}
379
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200380static bool rate_idx_match_mcs_mask(s8 *rate_idx, u8 *mcs_mask)
Simon Wunderlich19468412012-01-28 17:25:33 +0100381{
382 int i, j;
383 int ridx, rbit;
384
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200385 ridx = *rate_idx / 8;
386 rbit = *rate_idx % 8;
Simon Wunderlich19468412012-01-28 17:25:33 +0100387
388 /* sanity check */
Dan Carpenter910570b52012-02-01 10:42:11 +0300389 if (ridx < 0 || ridx >= IEEE80211_HT_MCS_MASK_LEN)
Simon Wunderlich19468412012-01-28 17:25:33 +0100390 return false;
391
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)) {
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200396 *rate_idx = i * 8 + j;
Simon Wunderlich19468412012-01-28 17:25:33 +0100397 return true;
398 }
399 rbit = 7;
400 }
401
402 /* Try to find a higher rate that would be allowed */
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200403 ridx = (*rate_idx + 1) / 8;
404 rbit = (*rate_idx + 1) % 8;
Simon Wunderlich19468412012-01-28 17:25:33 +0100405
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)) {
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200409 *rate_idx = i * 8 + j;
Simon Wunderlich19468412012-01-28 17:25:33 +0100410 return true;
411 }
412 rbit = 0;
413 }
414 return false;
415}
416
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200417static bool rate_idx_match_vht_mcs_mask(s8 *rate_idx, u16 *vht_mask)
418{
419 int i, j;
420 int ridx, rbit;
Simon Wunderlich19468412012-01-28 17:25:33 +0100421
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200422 ridx = *rate_idx >> 4;
423 rbit = *rate_idx & 0xf;
424
425 if (ridx < 0 || ridx >= NL80211_VHT_NSS_MAX)
426 return false;
427
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;
433 return true;
434 }
435 }
436 rbit = 15;
437 }
438
439 /* Try to find a higher rate that would be allowed */
440 ridx = (*rate_idx + 1) >> 4;
441 rbit = (*rate_idx + 1) & 0xf;
442
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;
447 return true;
448 }
449 }
450 rbit = 0;
451 }
452 return false;
453}
Simon Wunderlich19468412012-01-28 17:25:33 +0100454
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200455static void rate_idx_match_mask(s8 *rate_idx, u16 *rate_flags,
Felix Fietkau0d528d82013-04-22 16:14:41 +0200456 struct ieee80211_supported_band *sband,
457 enum nl80211_chan_width chan_width,
Simon Wunderlich19468412012-01-28 17:25:33 +0100458 u32 mask,
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200459 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN],
460 u16 vht_mask[NL80211_VHT_NSS_MAX])
Simon Wunderlich19468412012-01-28 17:25:33 +0100461{
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200462 if (*rate_flags & IEEE80211_TX_RC_VHT_MCS) {
463 /* handle VHT rates */
464 if (rate_idx_match_vht_mcs_mask(rate_idx, vht_mask))
465 return;
466
467 *rate_idx = 0;
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);
472
473 *rate_flags |= IEEE80211_TX_RC_MCS;
474 if (chan_width == NL80211_CHAN_WIDTH_40)
475 *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
476
477 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask))
478 return;
479
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,
484 mask))
485 return;
486 } else if (*rate_flags & IEEE80211_TX_RC_MCS) {
487 /* handle HT rates */
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200488 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask))
Simon Wunderlich19468412012-01-28 17:25:33 +0100489 return;
490
491 /* also try the legacy rates. */
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200492 *rate_idx = 0;
Simon Wunderlich19468412012-01-28 17:25:33 +0100493 /* keep protection flags */
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200494 *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,
498 mask))
Simon Wunderlich19468412012-01-28 17:25:33 +0100499 return;
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200500 } else {
Simon Wunderlich19468412012-01-28 17:25:33 +0100501 /* handle legacy rates */
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200502 if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates,
503 mask))
Simon Wunderlich19468412012-01-28 17:25:33 +0100504 return;
505
506 /* if HT BSS, and we handle a data frame, also try HT rates */
Simon Wunderlich0418a442013-05-16 13:00:31 +0200507 switch (chan_width) {
508 case NL80211_CHAN_WIDTH_20_NOHT:
509 case NL80211_CHAN_WIDTH_5:
510 case NL80211_CHAN_WIDTH_10:
Simon Wunderlich19468412012-01-28 17:25:33 +0100511 return;
Simon Wunderlich0418a442013-05-16 13:00:31 +0200512 default:
513 break;
514 }
Simon Wunderlich19468412012-01-28 17:25:33 +0100515
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200516 *rate_idx = 0;
Simon Wunderlich19468412012-01-28 17:25:33 +0100517 /* keep protection flags */
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200518 *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS |
519 IEEE80211_TX_RC_USE_CTS_PROTECT |
520 IEEE80211_TX_RC_USE_SHORT_PREAMBLE);
Simon Wunderlich19468412012-01-28 17:25:33 +0100521
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200522 *rate_flags |= IEEE80211_TX_RC_MCS;
Simon Wunderlich19468412012-01-28 17:25:33 +0100523
Felix Fietkau0d528d82013-04-22 16:14:41 +0200524 if (chan_width == NL80211_CHAN_WIDTH_40)
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200525 *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
Simon Wunderlich19468412012-01-28 17:25:33 +0100526
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200527 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask))
Jouni Malinen37eb0b12010-01-06 13:09:08 +0200528 return;
Jouni Malinen37eb0b12010-01-06 13:09:08 +0200529 }
530
531 /*
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
536 * selected.
537 */
538}
539
Felix Fietkau0d528d82013-04-22 16:14:41 +0200540static 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,
544 int max_rates)
545{
546 struct ieee80211_rate *rate;
547 bool inval = false;
548 int i;
549
550 /*
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
555 *
556 * XXX: Should this check all retry rates?
557 */
Felix Fietkau336004e2014-11-21 23:29:14 +0100558 if (!(rates[0].flags &
559 (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))) {
Felix Fietkau0d528d82013-04-22 16:14:41 +0200560 u32 basic_rates = vif->bss_conf.basic_rates;
Karl Beldanc7abf252014-10-13 14:34:41 +0200561 s8 baserate = basic_rates ? ffs(basic_rates) - 1 : 0;
Felix Fietkau0d528d82013-04-22 16:14:41 +0200562
563 rate = &sband->bitrates[rates[0].idx];
564
565 for (i = 0; i < sband->n_bitrates; i++) {
566 /* must be a basic rate */
567 if (!(basic_rates & BIT(i)))
568 continue;
569 /* must not be faster than the data rate */
570 if (sband->bitrates[i].bitrate > rate->bitrate)
571 continue;
572 /* maximum */
573 if (sband->bitrates[baserate].bitrate <
574 sband->bitrates[i].bitrate)
575 baserate = i;
576 }
577
578 info->control.rts_cts_rate_idx = baserate;
579 }
580
581 for (i = 0; i < max_rates; i++) {
582 /*
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.
586 */
587 if (inval) {
588 rates[i].idx = -1;
589 continue;
590 }
591 if (rates[i].idx < 0) {
592 inval = true;
593 continue;
594 }
595
596 /*
597 * For now assume MCS is already set up correctly, this
598 * needs to be fixed.
599 */
600 if (rates[i].flags & IEEE80211_TX_RC_MCS) {
601 WARN_ON(rates[i].idx > 76);
602
603 if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) &&
604 info->control.use_cts_prot)
605 rates[i].flags |=
606 IEEE80211_TX_RC_USE_CTS_PROTECT;
607 continue;
608 }
609
610 if (rates[i].flags & IEEE80211_TX_RC_VHT_MCS) {
611 WARN_ON(ieee80211_rate_get_vht_mcs(&rates[i]) > 9);
612 continue;
613 }
614
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;
619 }
620
621 /* RC is busted */
622 if (WARN_ON_ONCE(rates[i].idx >= sband->n_bitrates)) {
623 rates[i].idx = -1;
624 continue;
625 }
626
627 rate = &sband->bitrates[rates[i].idx];
628
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;
633
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;
639 }
640}
641
642
643static void rate_control_fill_sta_table(struct ieee80211_sta *sta,
644 struct ieee80211_tx_info *info,
645 struct ieee80211_tx_rate *rates,
646 int max_rates)
647{
648 struct ieee80211_sta_rates *ratetbl = NULL;
649 int i;
650
651 if (sta && !info->control.skip_table)
652 ratetbl = rcu_dereference(sta->rates);
653
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;
669 else
670 rates[i].count = ratetbl->rate[i].count;
671 } else {
672 rates[i].idx = -1;
673 rates[i].count = 0;
674 }
675
676 if (rates[i].idx < 0 || !rates[i].count)
677 break;
678 }
679}
680
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200681static bool rate_control_cap_mask(struct ieee80211_sub_if_data *sdata,
682 struct ieee80211_supported_band *sband,
683 struct ieee80211_sta *sta, u32 *mask,
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200684 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN],
685 u16 vht_mask[NL80211_VHT_NSS_MAX])
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200686{
687 u32 i, flags;
688
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)
693 *mask &= ~BIT(i);
694 }
695
696 if (*mask == (1 << sband->n_bitrates) - 1 &&
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200697 !sdata->rc_has_mcs_mask[sband->band] &&
698 !sdata->rc_has_vht_mcs_mask[sband->band])
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200699 return false;
700
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);
704 else
705 memset(mcs_mask, 0xff, IEEE80211_HT_MCS_MASK_LEN);
706
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200707 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);
710 else
711 memset(vht_mask, 0xff, sizeof(u16) * NL80211_VHT_NSS_MAX);
712
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200713 if (sta) {
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200714 __le16 sta_vht_cap;
715 u16 sta_vht_mask[NL80211_VHT_NSS_MAX];
716
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200717 /* Filter out rates that the STA does not support */
718 *mask &= sta->supp_rates[sband->band];
Thierry Reding98a1f822015-08-26 12:22:14 +0200719 for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++)
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200720 mcs_mask[i] &= sta->ht_cap.mcs.rx_mask[i];
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200721
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];
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200726 }
727
728 return true;
729}
730
Lorenzo Bianconie9108672015-08-06 23:47:32 +0200731static void
732rate_control_apply_mask_ratetbl(struct sta_info *sta,
733 struct ieee80211_supported_band *sband,
734 struct ieee80211_sta_rates *rates)
735{
736 int i;
737 u32 mask;
738 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN];
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200739 u16 vht_mask[NL80211_VHT_NSS_MAX];
Lorenzo Bianconie9108672015-08-06 23:47:32 +0200740 enum nl80211_chan_width chan_width;
741
742 if (!rate_control_cap_mask(sta->sdata, sband, &sta->sta, &mask,
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200743 mcs_mask, vht_mask))
Lorenzo Bianconie9108672015-08-06 23:47:32 +0200744 return;
745
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)
749 break;
750
751 rate_idx_match_mask(&rates->rate[i].idx, &rates->rate[i].flags,
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200752 sband, chan_width, mask, mcs_mask,
753 vht_mask);
Lorenzo Bianconie9108672015-08-06 23:47:32 +0200754 }
755}
756
Felix Fietkau0d528d82013-04-22 16:14:41 +0200757static void rate_control_apply_mask(struct ieee80211_sub_if_data *sdata,
758 struct ieee80211_sta *sta,
759 struct ieee80211_supported_band *sband,
Felix Fietkau0d528d82013-04-22 16:14:41 +0200760 struct ieee80211_tx_rate *rates,
761 int max_rates)
762{
763 enum nl80211_chan_width chan_width;
764 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN];
Felix Fietkau0d528d82013-04-22 16:14:41 +0200765 u32 mask;
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200766 u16 rate_flags, vht_mask[NL80211_VHT_NSS_MAX];
Felix Fietkau0d528d82013-04-22 16:14:41 +0200767 int i;
768
769 /*
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
772 * the common case.
773 */
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200774 if (!rate_control_cap_mask(sdata, sband, sta, &mask, mcs_mask,
775 vht_mask))
Felix Fietkau0d528d82013-04-22 16:14:41 +0200776 return;
777
Felix Fietkau0d528d82013-04-22 16:14:41 +0200778 /*
779 * Make sure the rate index selected for each TX rate is
780 * included in the configured mask and change the rate indexes
781 * if needed.
782 */
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)
787 break;
788
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200789 rate_flags = rates[i].flags;
790 rate_idx_match_mask(&rates[i].idx, &rate_flags, sband,
Lorenzo Bianconib119ad62015-08-06 23:47:33 +0200791 chan_width, mask, mcs_mask, vht_mask);
Lorenzo Bianconi90c66bd2015-08-06 23:47:31 +0200792 rates[i].flags = rate_flags;
Felix Fietkau0d528d82013-04-22 16:14:41 +0200793 }
794}
795
796void ieee80211_get_tx_rates(struct ieee80211_vif *vif,
797 struct ieee80211_sta *sta,
798 struct sk_buff *skb,
799 struct ieee80211_tx_rate *dest,
800 int max_rates)
801{
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;
806
807 rate_control_fill_sta_table(sta, info, dest, max_rates);
808
809 if (!vif)
810 return;
811
812 sdata = vif_to_sdata(vif);
813 sband = sdata->local->hw.wiphy->bands[info->band];
814
815 if (ieee80211_is_data(hdr->frame_control))
Lorenzo Bianconi35225eb2015-08-06 23:47:30 +0200816 rate_control_apply_mask(sdata, sta, sband, dest, max_rates);
Felix Fietkau0d528d82013-04-22 16:14:41 +0200817
818 if (dest[0].idx < 0)
Andrei Otcheretianski1d2d3502013-10-14 11:04:28 +0200819 __rate_control_send_low(&sdata->local->hw, sband, sta, info,
820 sdata->rc_rateidx_mask[info->band]);
Felix Fietkau0d528d82013-04-22 16:14:41 +0200821
822 if (sta)
823 rate_fixup_ratelist(vif, sband, info, dest, max_rates);
824}
825EXPORT_SYMBOL(ieee80211_get_tx_rates);
826
Johannes Berg4b7679a2008-09-18 18:14:18 +0200827void rate_control_get_rate(struct ieee80211_sub_if_data *sdata,
Johannes Berge6a98542008-10-21 12:40:02 +0200828 struct sta_info *sta,
829 struct ieee80211_tx_rate_control *txrc)
Mattias Nissler1abbe492007-12-20 13:50:07 +0100830{
Johannes Berg4b7679a2008-09-18 18:14:18 +0200831 struct rate_control_ref *ref = sdata->local->rate_ctrl;
832 void *priv_sta = NULL;
833 struct ieee80211_sta *ista = NULL;
Johannes Berge6a98542008-10-21 12:40:02 +0200834 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
Mattias Nissler1abbe492007-12-20 13:50:07 +0100835 int i;
Mattias Nissler1abbe492007-12-20 13:50:07 +0100836
Johannes Berge1936e92012-01-20 13:55:23 +0100837 if (sta && test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) {
Johannes Berg4b7679a2008-09-18 18:14:18 +0200838 ista = &sta->sta;
839 priv_sta = sta->rate_ctrl_priv;
840 }
841
Johannes Berge6a98542008-10-21 12:40:02 +0200842 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
843 info->control.rates[i].idx = -1;
844 info->control.rates[i].flags = 0;
Mohammed Shafi Shajakhan8617b092012-02-20 10:05:31 +0530845 info->control.rates[i].count = 0;
Mattias Nissler1abbe492007-12-20 13:50:07 +0100846 }
Johannes Berge6a98542008-10-21 12:40:02 +0200847
Johannes Berg30686bf2015-06-02 21:39:54 +0200848 if (ieee80211_hw_check(&sdata->local->hw, HAS_RATE_CONTROL))
Juuso Oikarinen5affcd62010-02-12 10:05:45 +0200849 return;
850
Johannes Berg35c347a2015-03-05 16:10:08 +0100851 if (ista) {
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);
855 } else {
856 ref->ops->get_rate(ref->priv, NULL, NULL, txrc);
857 }
Johannes Berge6a98542008-10-21 12:40:02 +0200858
Johannes Berg30686bf2015-06-02 21:39:54 +0200859 if (ieee80211_hw_check(&sdata->local->hw, SUPPORTS_RC_TABLE))
Felix Fietkau0d528d82013-04-22 16:14:41 +0200860 return;
Felix Fietkau2ffbe6d2013-04-16 13:38:42 +0200861
Felix Fietkau0d528d82013-04-22 16:14:41 +0200862 ieee80211_get_tx_rates(&sdata->vif, ista, txrc->skb,
863 info->control.rates,
864 ARRAY_SIZE(info->control.rates));
Mattias Nissler1abbe492007-12-20 13:50:07 +0100865}
866
Felix Fietkau0d528d82013-04-22 16:14:41 +0200867int rate_control_set_rates(struct ieee80211_hw *hw,
868 struct ieee80211_sta *pubsta,
869 struct ieee80211_sta_rates *rates)
870{
Johannes Bergf815e2b2014-11-19 00:10:42 +0100871 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
Felix Fietkauf6b3d852013-05-03 10:01:03 +0200872 struct ieee80211_sta_rates *old;
Lorenzo Bianconie9108672015-08-06 23:47:32 +0200873 struct ieee80211_supported_band *sband;
Felix Fietkau0d528d82013-04-22 16:14:41 +0200874
Lorenzo Bianconie9108672015-08-06 23:47:32 +0200875 sband = hw->wiphy->bands[ieee80211_get_sdata_band(sta->sdata)];
876 rate_control_apply_mask_ratetbl(sta, sband, rates);
Felix Fietkauf6b3d852013-05-03 10:01:03 +0200877 /*
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.
882 */
883 old = rcu_dereference_protected(pubsta->rates, true);
Felix Fietkau0d528d82013-04-22 16:14:41 +0200884 rcu_assign_pointer(pubsta->rates, rates);
885 if (old)
886 kfree_rcu(old, rcu_head);
887
Johannes Bergf815e2b2014-11-19 00:10:42 +0100888 drv_sta_rate_tbl_update(hw_to_local(hw), sta->sdata, pubsta);
889
Felix Fietkau0d528d82013-04-22 16:14:41 +0200890 return 0;
891}
892EXPORT_SYMBOL(rate_control_set_rates);
893
Johannes Bergff688082007-07-27 15:43:23 +0200894int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local,
895 const char *name)
896{
Johannes Berg889cbb92012-01-17 10:33:29 +0100897 struct rate_control_ref *ref;
Johannes Bergff688082007-07-27 15:43:23 +0200898
899 ASSERT_RTNL();
Johannes Bergaf65cd962009-11-17 18:18:36 +0100900
Johannes Berg3b8d81e02009-06-17 17:43:56 +0200901 if (local->open_count)
Johannes Bergff688082007-07-27 15:43:23 +0200902 return -EBUSY;
903
Johannes Berg30686bf2015-06-02 21:39:54 +0200904 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
Johannes Bergaf65cd962009-11-17 18:18:36 +0100905 if (WARN_ON(!local->ops->set_rts_threshold))
906 return -EINVAL;
907 return 0;
908 }
909
Johannes Bergff688082007-07-27 15:43:23 +0200910 ref = rate_control_alloc(name, local);
911 if (!ref) {
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700912 wiphy_warn(local->hw.wiphy,
913 "Failed to select rate control algorithm\n");
Johannes Bergff688082007-07-27 15:43:23 +0200914 return -ENOENT;
915 }
916
Johannes Berg889cbb92012-01-17 10:33:29 +0100917 WARN_ON(local->rate_ctrl);
Johannes Bergff688082007-07-27 15:43:23 +0200918 local->rate_ctrl = ref;
Johannes Bergff688082007-07-27 15:43:23 +0200919
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700920 wiphy_debug(local->hw.wiphy, "Selected rate control algorithm '%s'\n",
921 ref->ops->name);
Johannes Bergff688082007-07-27 15:43:23 +0200922
Johannes Bergff688082007-07-27 15:43:23 +0200923 return 0;
924}
925
926void rate_control_deinitialize(struct ieee80211_local *local)
927{
928 struct rate_control_ref *ref;
929
930 ref = local->rate_ctrl;
Johannes Bergaf65cd962009-11-17 18:18:36 +0100931
932 if (!ref)
933 return;
934
Johannes Bergff688082007-07-27 15:43:23 +0200935 local->rate_ctrl = NULL;
Johannes Berg889cbb92012-01-17 10:33:29 +0100936 rate_control_free(ref);
Johannes Bergff688082007-07-27 15:43:23 +0200937}
Stefano Brivioc21b39a2007-12-19 01:26:16 +0100938