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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
f0706e82 JB |
2 | /* |
3 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
4 | * Copyright 2005-2006, Devicescape Software, Inc. | |
5 | * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz> | |
e8e4f528 | 6 | * Copyright 2017 Intel Deutschland GmbH |
f0706e82 JB |
7 | */ |
8 | ||
9 | #include <linux/kernel.h> | |
ff688089 | 10 | #include <linux/rtnetlink.h> |
3a9a231d | 11 | #include <linux/module.h> |
cc01f9b5 | 12 | #include <linux/slab.h> |
2c8dccc7 | 13 | #include "rate.h" |
f0706e82 | 14 | #include "ieee80211_i.h" |
4b7679a5 | 15 | #include "debugfs.h" |
f0706e82 JB |
16 | |
17 | struct rate_control_alg { | |
18 | struct list_head list; | |
631ad703 | 19 | const struct rate_control_ops *ops; |
f0706e82 JB |
20 | }; |
21 | ||
22 | static LIST_HEAD(rate_ctrl_algs); | |
23 | static DEFINE_MUTEX(rate_ctrl_mutex); | |
24 | ||
c21b39ac SB |
25 | static char *ieee80211_default_rc_algo = CONFIG_MAC80211_RC_DEFAULT; |
26 | module_param(ieee80211_default_rc_algo, charp, 0644); | |
27 | MODULE_PARM_DESC(ieee80211_default_rc_algo, | |
28 | "Default rate control algorithm for mac80211 to use"); | |
29 | ||
eb6d9293 DV |
30 | void rate_control_rate_init(struct sta_info *sta) |
31 | { | |
32 | struct ieee80211_local *local = sta->sdata->local; | |
33 | struct rate_control_ref *ref = sta->rate_ctrl; | |
34 | struct ieee80211_sta *ista = &sta->sta; | |
35 | void *priv_sta = sta->rate_ctrl_priv; | |
36 | struct ieee80211_supported_band *sband; | |
37 | struct ieee80211_chanctx_conf *chanctx_conf; | |
38 | ||
39 | ieee80211_sta_set_rx_nss(sta); | |
40 | ||
41 | if (!ref) | |
42 | return; | |
43 | ||
44 | rcu_read_lock(); | |
45 | ||
46 | chanctx_conf = rcu_dereference(sta->sdata->vif.chanctx_conf); | |
47 | if (WARN_ON(!chanctx_conf)) { | |
48 | rcu_read_unlock(); | |
49 | return; | |
50 | } | |
51 | ||
52 | sband = local->hw.wiphy->bands[chanctx_conf->def.chan->band]; | |
53 | ||
54 | spin_lock_bh(&sta->rate_ctrl_lock); | |
55 | ref->ops->rate_init(ref->priv, sband, &chanctx_conf->def, ista, | |
56 | priv_sta); | |
57 | spin_unlock_bh(&sta->rate_ctrl_lock); | |
58 | rcu_read_unlock(); | |
59 | set_sta_flag(sta, WLAN_STA_RATE_CONTROL); | |
60 | } | |
61 | ||
18fb84d9 FF |
62 | void rate_control_tx_status(struct ieee80211_local *local, |
63 | struct ieee80211_supported_band *sband, | |
64 | struct ieee80211_tx_status *st) | |
65 | { | |
66 | struct rate_control_ref *ref = local->rate_ctrl; | |
67 | struct sta_info *sta = container_of(st->sta, struct sta_info, sta); | |
68 | void *priv_sta = sta->rate_ctrl_priv; | |
69 | ||
70 | if (!ref || !test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) | |
71 | return; | |
72 | ||
73 | spin_lock_bh(&sta->rate_ctrl_lock); | |
74 | if (ref->ops->tx_status_ext) | |
75 | ref->ops->tx_status_ext(ref->priv, sband, priv_sta, st); | |
76 | else if (st->skb) | |
77 | ref->ops->tx_status(ref->priv, sband, st->sta, priv_sta, st->skb); | |
78 | else | |
79 | WARN_ON_ONCE(1); | |
80 | ||
81 | spin_unlock_bh(&sta->rate_ctrl_lock); | |
82 | } | |
83 | ||
eb6d9293 DV |
84 | void rate_control_rate_update(struct ieee80211_local *local, |
85 | struct ieee80211_supported_band *sband, | |
86 | struct sta_info *sta, u32 changed) | |
87 | { | |
88 | struct rate_control_ref *ref = local->rate_ctrl; | |
89 | struct ieee80211_sta *ista = &sta->sta; | |
90 | void *priv_sta = sta->rate_ctrl_priv; | |
91 | struct ieee80211_chanctx_conf *chanctx_conf; | |
92 | ||
93 | if (ref && ref->ops->rate_update) { | |
94 | rcu_read_lock(); | |
95 | ||
96 | chanctx_conf = rcu_dereference(sta->sdata->vif.chanctx_conf); | |
97 | if (WARN_ON(!chanctx_conf)) { | |
98 | rcu_read_unlock(); | |
99 | return; | |
100 | } | |
101 | ||
102 | spin_lock_bh(&sta->rate_ctrl_lock); | |
103 | ref->ops->rate_update(ref->priv, sband, &chanctx_conf->def, | |
104 | ista, priv_sta, changed); | |
105 | spin_unlock_bh(&sta->rate_ctrl_lock); | |
106 | rcu_read_unlock(); | |
107 | } | |
108 | drv_sta_rc_update(local, sta->sdata, &sta->sta, changed); | |
109 | } | |
110 | ||
631ad703 | 111 | int ieee80211_rate_control_register(const struct rate_control_ops *ops) |
f0706e82 JB |
112 | { |
113 | struct rate_control_alg *alg; | |
114 | ||
ac71c691 JB |
115 | if (!ops->name) |
116 | return -EINVAL; | |
117 | ||
999acd9c JB |
118 | mutex_lock(&rate_ctrl_mutex); |
119 | list_for_each_entry(alg, &rate_ctrl_algs, list) { | |
120 | if (!strcmp(alg->ops->name, ops->name)) { | |
121 | /* don't register an algorithm twice */ | |
122 | WARN_ON(1); | |
b808ab16 | 123 | mutex_unlock(&rate_ctrl_mutex); |
999acd9c JB |
124 | return -EALREADY; |
125 | } | |
126 | } | |
127 | ||
dd00cc48 | 128 | alg = kzalloc(sizeof(*alg), GFP_KERNEL); |
f0706e82 | 129 | if (alg == NULL) { |
999acd9c | 130 | mutex_unlock(&rate_ctrl_mutex); |
f0706e82 JB |
131 | return -ENOMEM; |
132 | } | |
f0706e82 JB |
133 | alg->ops = ops; |
134 | ||
f0706e82 JB |
135 | list_add_tail(&alg->list, &rate_ctrl_algs); |
136 | mutex_unlock(&rate_ctrl_mutex); | |
137 | ||
138 | return 0; | |
139 | } | |
140 | EXPORT_SYMBOL(ieee80211_rate_control_register); | |
141 | ||
631ad703 | 142 | void ieee80211_rate_control_unregister(const struct rate_control_ops *ops) |
f0706e82 JB |
143 | { |
144 | struct rate_control_alg *alg; | |
145 | ||
146 | mutex_lock(&rate_ctrl_mutex); | |
147 | list_for_each_entry(alg, &rate_ctrl_algs, list) { | |
148 | if (alg->ops == ops) { | |
149 | list_del(&alg->list); | |
20880e89 | 150 | kfree(alg); |
f0706e82 JB |
151 | break; |
152 | } | |
153 | } | |
154 | mutex_unlock(&rate_ctrl_mutex); | |
f0706e82 JB |
155 | } |
156 | EXPORT_SYMBOL(ieee80211_rate_control_unregister); | |
157 | ||
631ad703 | 158 | static const struct rate_control_ops * |
f0706e82 JB |
159 | ieee80211_try_rate_control_ops_get(const char *name) |
160 | { | |
161 | struct rate_control_alg *alg; | |
631ad703 | 162 | const struct rate_control_ops *ops = NULL; |
f0706e82 | 163 | |
ac71c691 JB |
164 | if (!name) |
165 | return NULL; | |
166 | ||
f0706e82 JB |
167 | mutex_lock(&rate_ctrl_mutex); |
168 | list_for_each_entry(alg, &rate_ctrl_algs, list) { | |
cc01f9b5 JB |
169 | if (!strcmp(alg->ops->name, name)) { |
170 | ops = alg->ops; | |
171 | break; | |
172 | } | |
f0706e82 JB |
173 | } |
174 | mutex_unlock(&rate_ctrl_mutex); | |
175 | return ops; | |
176 | } | |
177 | ||
c21b39ac | 178 | /* Get the rate control algorithm. */ |
631ad703 | 179 | static const struct rate_control_ops * |
f0706e82 JB |
180 | ieee80211_rate_control_ops_get(const char *name) |
181 | { | |
631ad703 | 182 | const struct rate_control_ops *ops; |
c21b39ac | 183 | const char *alg_name; |
f0706e82 | 184 | |
b51d23e4 | 185 | kernel_param_lock(THIS_MODULE); |
ac71c691 | 186 | if (!name) |
c21b39ac SB |
187 | alg_name = ieee80211_default_rc_algo; |
188 | else | |
189 | alg_name = name; | |
ac71c691 | 190 | |
c21b39ac | 191 | ops = ieee80211_try_rate_control_ops_get(alg_name); |
c21b39ac SB |
192 | if (!ops && name) |
193 | /* try default if specific alg requested but not found */ | |
194 | ops = ieee80211_try_rate_control_ops_get(ieee80211_default_rc_algo); | |
195 | ||
93f56de2 MK |
196 | /* Note: check for > 0 is intentional to avoid clang warning */ |
197 | if (!ops && (strlen(CONFIG_MAC80211_RC_DEFAULT) > 0)) | |
198 | /* try built-in one if specific alg requested but not found */ | |
4b475898 | 199 | ops = ieee80211_try_rate_control_ops_get(CONFIG_MAC80211_RC_DEFAULT); |
93f56de2 | 200 | |
b51d23e4 | 201 | kernel_param_unlock(THIS_MODULE); |
4b475898 | 202 | |
f0706e82 JB |
203 | return ops; |
204 | } | |
205 | ||
4b7679a5 JB |
206 | #ifdef CONFIG_MAC80211_DEBUGFS |
207 | static ssize_t rcname_read(struct file *file, char __user *userbuf, | |
208 | size_t count, loff_t *ppos) | |
209 | { | |
210 | struct rate_control_ref *ref = file->private_data; | |
211 | int len = strlen(ref->ops->name); | |
212 | ||
213 | return simple_read_from_buffer(userbuf, count, ppos, | |
214 | ref->ops->name, len); | |
215 | } | |
216 | ||
217 | static const struct file_operations rcname_ops = { | |
218 | .read = rcname_read, | |
234e3405 | 219 | .open = simple_open, |
6038f373 | 220 | .llseek = default_llseek, |
4b7679a5 JB |
221 | }; |
222 | #endif | |
223 | ||
209c671d | 224 | static struct rate_control_ref *rate_control_alloc(const char *name, |
f0706e82 JB |
225 | struct ieee80211_local *local) |
226 | { | |
4b7679a5 | 227 | struct dentry *debugfsdir = NULL; |
f0706e82 JB |
228 | struct rate_control_ref *ref; |
229 | ||
230 | ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL); | |
231 | if (!ref) | |
cc01f9b5 | 232 | return NULL; |
f0706e82 JB |
233 | ref->ops = ieee80211_rate_control_ops_get(name); |
234 | if (!ref->ops) | |
cc01f9b5 | 235 | goto free; |
4b7679a5 JB |
236 | |
237 | #ifdef CONFIG_MAC80211_DEBUGFS | |
238 | debugfsdir = debugfs_create_dir("rc", local->hw.wiphy->debugfsdir); | |
239 | local->debugfs.rcdir = debugfsdir; | |
7bcfaf2f | 240 | debugfs_create_file("name", 0400, debugfsdir, ref, &rcname_ops); |
4b7679a5 JB |
241 | #endif |
242 | ||
243 | ref->priv = ref->ops->alloc(&local->hw, debugfsdir); | |
f0706e82 | 244 | if (!ref->priv) |
cc01f9b5 | 245 | goto free; |
f0706e82 JB |
246 | return ref; |
247 | ||
cc01f9b5 | 248 | free: |
f0706e82 | 249 | kfree(ref); |
f0706e82 JB |
250 | return NULL; |
251 | } | |
252 | ||
a858958b JB |
253 | static void rate_control_free(struct ieee80211_local *local, |
254 | struct rate_control_ref *ctrl_ref) | |
f0706e82 | 255 | { |
f0706e82 | 256 | ctrl_ref->ops->free(ctrl_ref->priv); |
4b7679a5 JB |
257 | |
258 | #ifdef CONFIG_MAC80211_DEBUGFS | |
a858958b JB |
259 | debugfs_remove_recursive(local->debugfs.rcdir); |
260 | local->debugfs.rcdir = NULL; | |
4b7679a5 JB |
261 | #endif |
262 | ||
f0706e82 JB |
263 | kfree(ctrl_ref); |
264 | } | |
265 | ||
e8e4f528 JB |
266 | void ieee80211_check_rate_mask(struct ieee80211_sub_if_data *sdata) |
267 | { | |
268 | struct ieee80211_local *local = sdata->local; | |
269 | struct ieee80211_supported_band *sband; | |
270 | u32 user_mask, basic_rates = sdata->vif.bss_conf.basic_rates; | |
271 | enum nl80211_band band; | |
272 | ||
273 | if (WARN_ON(!sdata->vif.bss_conf.chandef.chan)) | |
274 | return; | |
275 | ||
276 | if (WARN_ON_ONCE(!basic_rates)) | |
277 | return; | |
278 | ||
279 | band = sdata->vif.bss_conf.chandef.chan->band; | |
280 | user_mask = sdata->rc_rateidx_mask[band]; | |
281 | sband = local->hw.wiphy->bands[band]; | |
282 | ||
283 | if (user_mask & basic_rates) | |
284 | return; | |
285 | ||
286 | sdata_dbg(sdata, | |
287 | "no overlap between basic rates (0x%x) and user mask (0x%x on band %d) - clearing the latter", | |
288 | basic_rates, user_mask, band); | |
289 | sdata->rc_rateidx_mask[band] = (1 << sband->n_bitrates) - 1; | |
290 | } | |
291 | ||
b6f35301 | 292 | static bool rc_no_data_or_no_ack_use_min(struct ieee80211_tx_rate_control *txrc) |
4c6d4f5c LR |
293 | { |
294 | struct sk_buff *skb = txrc->skb; | |
295 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
296 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
297 | __le16 fc; | |
298 | ||
299 | fc = hdr->frame_control; | |
300 | ||
b6f35301 RM |
301 | return (info->flags & (IEEE80211_TX_CTL_NO_ACK | |
302 | IEEE80211_TX_CTL_USE_MINRATE)) || | |
303 | !ieee80211_is_data(fc); | |
4c6d4f5c LR |
304 | } |
305 | ||
06703079 | 306 | static void rc_send_low_basicrate(s8 *idx, u32 basic_rates, |
8f0729b1 | 307 | struct ieee80211_supported_band *sband) |
e00cfce0 JM |
308 | { |
309 | u8 i; | |
310 | ||
311 | if (basic_rates == 0) | |
312 | return; /* assume basic rates unknown and accept rate */ | |
313 | if (*idx < 0) | |
314 | return; | |
315 | if (basic_rates & (1 << *idx)) | |
316 | return; /* selected rate is a basic rate */ | |
317 | ||
8f0729b1 | 318 | for (i = *idx + 1; i <= sband->n_bitrates; i++) { |
e00cfce0 JM |
319 | if (basic_rates & (1 << i)) { |
320 | *idx = i; | |
321 | return; | |
322 | } | |
323 | } | |
324 | ||
325 | /* could not find a basic rate; use original selection */ | |
326 | } | |
327 | ||
2103dec1 SW |
328 | static void __rate_control_send_low(struct ieee80211_hw *hw, |
329 | struct ieee80211_supported_band *sband, | |
330 | struct ieee80211_sta *sta, | |
1d2d350b AO |
331 | struct ieee80211_tx_info *info, |
332 | u32 rate_mask) | |
aad14ceb RM |
333 | { |
334 | int i; | |
2103dec1 SW |
335 | u32 rate_flags = |
336 | ieee80211_chandef_rate_flags(&hw->conf.chandef); | |
aad14ceb | 337 | |
57fbcce3 | 338 | if ((sband->band == NL80211_BAND_2GHZ) && |
2103dec1 SW |
339 | (info->flags & IEEE80211_TX_CTL_NO_CCK_RATE)) |
340 | rate_flags |= IEEE80211_RATE_ERP_G; | |
341 | ||
342 | info->control.rates[0].idx = 0; | |
aad14ceb | 343 | for (i = 0; i < sband->n_bitrates; i++) { |
1d2d350b AO |
344 | if (!(rate_mask & BIT(i))) |
345 | continue; | |
346 | ||
1431fcb7 AO |
347 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) |
348 | continue; | |
349 | ||
2103dec1 | 350 | if (!rate_supported(sta, sband->band, i)) |
aad14ceb RM |
351 | continue; |
352 | ||
2103dec1 SW |
353 | info->control.rates[0].idx = i; |
354 | break; | |
aad14ceb | 355 | } |
0e5c371a JB |
356 | WARN_ONCE(i == sband->n_bitrates, |
357 | "no supported rates (0x%x) in rate_mask 0x%x with flags 0x%x\n", | |
ef95d8ba | 358 | sta ? sta->supp_rates[sband->band] : -1, |
0e5c371a | 359 | rate_mask, rate_flags); |
0d528d85 FF |
360 | |
361 | info->control.rates[0].count = | |
362 | (info->flags & IEEE80211_TX_CTL_NO_ACK) ? | |
363 | 1 : hw->max_rate_tries; | |
364 | ||
365 | info->control.skip_table = 1; | |
366 | } | |
367 | ||
aad14ceb | 368 | |
06703079 | 369 | bool rate_control_send_low(struct ieee80211_sta *pubsta, |
4c6d4f5c LR |
370 | void *priv_sta, |
371 | struct ieee80211_tx_rate_control *txrc) | |
372 | { | |
373 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); | |
dd5b4cc7 | 374 | struct ieee80211_supported_band *sband = txrc->sband; |
06703079 | 375 | struct sta_info *sta; |
dd5b4cc7 | 376 | int mcast_rate; |
06703079 | 377 | bool use_basicrate = false; |
4c6d4f5c | 378 | |
06703079 | 379 | if (!pubsta || !priv_sta || rc_no_data_or_no_ack_use_min(txrc)) { |
1d2d350b AO |
380 | __rate_control_send_low(txrc->hw, sband, pubsta, info, |
381 | txrc->rate_idx_mask); | |
0d528d85 | 382 | |
06703079 | 383 | if (!pubsta && txrc->bss) { |
dd5b4cc7 FF |
384 | mcast_rate = txrc->bss_conf->mcast_rate[sband->band]; |
385 | if (mcast_rate > 0) { | |
386 | info->control.rates[0].idx = mcast_rate - 1; | |
387 | return true; | |
388 | } | |
06703079 CYY |
389 | use_basicrate = true; |
390 | } else if (pubsta) { | |
391 | sta = container_of(pubsta, struct sta_info, sta); | |
392 | if (ieee80211_vif_is_mesh(&sta->sdata->vif)) | |
393 | use_basicrate = true; | |
394 | } | |
dd5b4cc7 | 395 | |
06703079 CYY |
396 | if (use_basicrate) |
397 | rc_send_low_basicrate(&info->control.rates[0].idx, | |
e00cfce0 | 398 | txrc->bss_conf->basic_rates, |
dd5b4cc7 | 399 | sband); |
06703079 | 400 | |
4c6d4f5c LR |
401 | return true; |
402 | } | |
403 | return false; | |
404 | } | |
405 | EXPORT_SYMBOL(rate_control_send_low); | |
406 | ||
90c66bd2 | 407 | static bool rate_idx_match_legacy_mask(s8 *rate_idx, int n_bitrates, u32 mask) |
37eb0b16 JM |
408 | { |
409 | int j; | |
410 | ||
411 | /* See whether the selected rate or anything below it is allowed. */ | |
90c66bd2 | 412 | for (j = *rate_idx; j >= 0; j--) { |
37eb0b16 JM |
413 | if (mask & (1 << j)) { |
414 | /* Okay, found a suitable rate. Use it. */ | |
90c66bd2 | 415 | *rate_idx = j; |
19468413 | 416 | return true; |
37eb0b16 JM |
417 | } |
418 | } | |
419 | ||
420 | /* Try to find a higher rate that would be allowed */ | |
90c66bd2 | 421 | for (j = *rate_idx + 1; j < n_bitrates; j++) { |
37eb0b16 JM |
422 | if (mask & (1 << j)) { |
423 | /* Okay, found a suitable rate. Use it. */ | |
90c66bd2 | 424 | *rate_idx = j; |
19468413 SW |
425 | return true; |
426 | } | |
427 | } | |
428 | return false; | |
429 | } | |
430 | ||
90c66bd2 | 431 | static bool rate_idx_match_mcs_mask(s8 *rate_idx, u8 *mcs_mask) |
19468413 SW |
432 | { |
433 | int i, j; | |
434 | int ridx, rbit; | |
435 | ||
90c66bd2 LB |
436 | ridx = *rate_idx / 8; |
437 | rbit = *rate_idx % 8; | |
19468413 SW |
438 | |
439 | /* sanity check */ | |
910570b5 | 440 | if (ridx < 0 || ridx >= IEEE80211_HT_MCS_MASK_LEN) |
19468413 SW |
441 | return false; |
442 | ||
443 | /* See whether the selected rate or anything below it is allowed. */ | |
444 | for (i = ridx; i >= 0; i--) { | |
445 | for (j = rbit; j >= 0; j--) | |
446 | if (mcs_mask[i] & BIT(j)) { | |
90c66bd2 | 447 | *rate_idx = i * 8 + j; |
19468413 SW |
448 | return true; |
449 | } | |
450 | rbit = 7; | |
451 | } | |
452 | ||
453 | /* Try to find a higher rate that would be allowed */ | |
90c66bd2 LB |
454 | ridx = (*rate_idx + 1) / 8; |
455 | rbit = (*rate_idx + 1) % 8; | |
19468413 SW |
456 | |
457 | for (i = ridx; i < IEEE80211_HT_MCS_MASK_LEN; i++) { | |
458 | for (j = rbit; j < 8; j++) | |
459 | if (mcs_mask[i] & BIT(j)) { | |
90c66bd2 | 460 | *rate_idx = i * 8 + j; |
19468413 SW |
461 | return true; |
462 | } | |
463 | rbit = 0; | |
464 | } | |
465 | return false; | |
466 | } | |
467 | ||
b119ad6e LB |
468 | static bool rate_idx_match_vht_mcs_mask(s8 *rate_idx, u16 *vht_mask) |
469 | { | |
470 | int i, j; | |
471 | int ridx, rbit; | |
472 | ||
473 | ridx = *rate_idx >> 4; | |
474 | rbit = *rate_idx & 0xf; | |
475 | ||
476 | if (ridx < 0 || ridx >= NL80211_VHT_NSS_MAX) | |
477 | return false; | |
19468413 | 478 | |
b119ad6e LB |
479 | /* See whether the selected rate or anything below it is allowed. */ |
480 | for (i = ridx; i >= 0; i--) { | |
481 | for (j = rbit; j >= 0; j--) { | |
482 | if (vht_mask[i] & BIT(j)) { | |
483 | *rate_idx = (i << 4) | j; | |
484 | return true; | |
485 | } | |
486 | } | |
487 | rbit = 15; | |
488 | } | |
489 | ||
490 | /* Try to find a higher rate that would be allowed */ | |
491 | ridx = (*rate_idx + 1) >> 4; | |
492 | rbit = (*rate_idx + 1) & 0xf; | |
493 | ||
494 | for (i = ridx; i < NL80211_VHT_NSS_MAX; i++) { | |
495 | for (j = rbit; j < 16; j++) { | |
496 | if (vht_mask[i] & BIT(j)) { | |
497 | *rate_idx = (i << 4) | j; | |
498 | return true; | |
499 | } | |
500 | } | |
501 | rbit = 0; | |
502 | } | |
503 | return false; | |
504 | } | |
19468413 | 505 | |
90c66bd2 | 506 | static void rate_idx_match_mask(s8 *rate_idx, u16 *rate_flags, |
0d528d85 FF |
507 | struct ieee80211_supported_band *sband, |
508 | enum nl80211_chan_width chan_width, | |
19468413 | 509 | u32 mask, |
b119ad6e LB |
510 | u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN], |
511 | u16 vht_mask[NL80211_VHT_NSS_MAX]) | |
19468413 | 512 | { |
b119ad6e LB |
513 | if (*rate_flags & IEEE80211_TX_RC_VHT_MCS) { |
514 | /* handle VHT rates */ | |
515 | if (rate_idx_match_vht_mcs_mask(rate_idx, vht_mask)) | |
516 | return; | |
517 | ||
518 | *rate_idx = 0; | |
519 | /* keep protection flags */ | |
520 | *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS | | |
521 | IEEE80211_TX_RC_USE_CTS_PROTECT | | |
522 | IEEE80211_TX_RC_USE_SHORT_PREAMBLE); | |
523 | ||
524 | *rate_flags |= IEEE80211_TX_RC_MCS; | |
525 | if (chan_width == NL80211_CHAN_WIDTH_40) | |
526 | *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; | |
527 | ||
528 | if (rate_idx_match_mcs_mask(rate_idx, mcs_mask)) | |
529 | return; | |
530 | ||
531 | /* also try the legacy rates. */ | |
532 | *rate_flags &= ~(IEEE80211_TX_RC_MCS | | |
533 | IEEE80211_TX_RC_40_MHZ_WIDTH); | |
534 | if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates, | |
535 | mask)) | |
536 | return; | |
537 | } else if (*rate_flags & IEEE80211_TX_RC_MCS) { | |
538 | /* handle HT rates */ | |
90c66bd2 | 539 | if (rate_idx_match_mcs_mask(rate_idx, mcs_mask)) |
19468413 SW |
540 | return; |
541 | ||
542 | /* also try the legacy rates. */ | |
90c66bd2 | 543 | *rate_idx = 0; |
19468413 | 544 | /* keep protection flags */ |
90c66bd2 LB |
545 | *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS | |
546 | IEEE80211_TX_RC_USE_CTS_PROTECT | | |
547 | IEEE80211_TX_RC_USE_SHORT_PREAMBLE); | |
548 | if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates, | |
549 | mask)) | |
19468413 | 550 | return; |
b119ad6e | 551 | } else { |
19468413 | 552 | /* handle legacy rates */ |
90c66bd2 LB |
553 | if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates, |
554 | mask)) | |
19468413 SW |
555 | return; |
556 | ||
557 | /* if HT BSS, and we handle a data frame, also try HT rates */ | |
0418a445 SW |
558 | switch (chan_width) { |
559 | case NL80211_CHAN_WIDTH_20_NOHT: | |
560 | case NL80211_CHAN_WIDTH_5: | |
561 | case NL80211_CHAN_WIDTH_10: | |
19468413 | 562 | return; |
0418a445 SW |
563 | default: |
564 | break; | |
565 | } | |
19468413 | 566 | |
90c66bd2 | 567 | *rate_idx = 0; |
19468413 | 568 | /* keep protection flags */ |
90c66bd2 LB |
569 | *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS | |
570 | IEEE80211_TX_RC_USE_CTS_PROTECT | | |
571 | IEEE80211_TX_RC_USE_SHORT_PREAMBLE); | |
19468413 | 572 | |
90c66bd2 | 573 | *rate_flags |= IEEE80211_TX_RC_MCS; |
19468413 | 574 | |
0d528d85 | 575 | if (chan_width == NL80211_CHAN_WIDTH_40) |
90c66bd2 | 576 | *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; |
19468413 | 577 | |
90c66bd2 | 578 | if (rate_idx_match_mcs_mask(rate_idx, mcs_mask)) |
37eb0b16 | 579 | return; |
37eb0b16 JM |
580 | } |
581 | ||
582 | /* | |
583 | * Uh.. No suitable rate exists. This should not really happen with | |
584 | * sane TX rate mask configurations. However, should someone manage to | |
585 | * configure supported rates and TX rate mask in incompatible way, | |
586 | * allow the frame to be transmitted with whatever the rate control | |
587 | * selected. | |
588 | */ | |
589 | } | |
590 | ||
0d528d85 FF |
591 | static void rate_fixup_ratelist(struct ieee80211_vif *vif, |
592 | struct ieee80211_supported_band *sband, | |
593 | struct ieee80211_tx_info *info, | |
594 | struct ieee80211_tx_rate *rates, | |
595 | int max_rates) | |
596 | { | |
597 | struct ieee80211_rate *rate; | |
598 | bool inval = false; | |
599 | int i; | |
600 | ||
601 | /* | |
602 | * Set up the RTS/CTS rate as the fastest basic rate | |
603 | * that is not faster than the data rate unless there | |
604 | * is no basic rate slower than the data rate, in which | |
605 | * case we pick the slowest basic rate | |
606 | * | |
607 | * XXX: Should this check all retry rates? | |
608 | */ | |
336004e2 FF |
609 | if (!(rates[0].flags & |
610 | (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))) { | |
0d528d85 | 611 | u32 basic_rates = vif->bss_conf.basic_rates; |
c7abf25a | 612 | s8 baserate = basic_rates ? ffs(basic_rates) - 1 : 0; |
0d528d85 FF |
613 | |
614 | rate = &sband->bitrates[rates[0].idx]; | |
615 | ||
616 | for (i = 0; i < sband->n_bitrates; i++) { | |
617 | /* must be a basic rate */ | |
618 | if (!(basic_rates & BIT(i))) | |
619 | continue; | |
620 | /* must not be faster than the data rate */ | |
621 | if (sband->bitrates[i].bitrate > rate->bitrate) | |
622 | continue; | |
623 | /* maximum */ | |
624 | if (sband->bitrates[baserate].bitrate < | |
625 | sband->bitrates[i].bitrate) | |
626 | baserate = i; | |
627 | } | |
628 | ||
629 | info->control.rts_cts_rate_idx = baserate; | |
630 | } | |
631 | ||
632 | for (i = 0; i < max_rates; i++) { | |
633 | /* | |
634 | * make sure there's no valid rate following | |
635 | * an invalid one, just in case drivers don't | |
636 | * take the API seriously to stop at -1. | |
637 | */ | |
638 | if (inval) { | |
639 | rates[i].idx = -1; | |
640 | continue; | |
641 | } | |
642 | if (rates[i].idx < 0) { | |
643 | inval = true; | |
644 | continue; | |
645 | } | |
646 | ||
647 | /* | |
648 | * For now assume MCS is already set up correctly, this | |
649 | * needs to be fixed. | |
650 | */ | |
651 | if (rates[i].flags & IEEE80211_TX_RC_MCS) { | |
652 | WARN_ON(rates[i].idx > 76); | |
653 | ||
654 | if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) && | |
655 | info->control.use_cts_prot) | |
656 | rates[i].flags |= | |
657 | IEEE80211_TX_RC_USE_CTS_PROTECT; | |
658 | continue; | |
659 | } | |
660 | ||
661 | if (rates[i].flags & IEEE80211_TX_RC_VHT_MCS) { | |
662 | WARN_ON(ieee80211_rate_get_vht_mcs(&rates[i]) > 9); | |
663 | continue; | |
664 | } | |
665 | ||
666 | /* set up RTS protection if desired */ | |
667 | if (info->control.use_rts) { | |
668 | rates[i].flags |= IEEE80211_TX_RC_USE_RTS_CTS; | |
669 | info->control.use_cts_prot = false; | |
670 | } | |
671 | ||
672 | /* RC is busted */ | |
673 | if (WARN_ON_ONCE(rates[i].idx >= sband->n_bitrates)) { | |
674 | rates[i].idx = -1; | |
675 | continue; | |
676 | } | |
677 | ||
678 | rate = &sband->bitrates[rates[i].idx]; | |
679 | ||
680 | /* set up short preamble */ | |
681 | if (info->control.short_preamble && | |
682 | rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) | |
683 | rates[i].flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE; | |
684 | ||
685 | /* set up G protection */ | |
686 | if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) && | |
687 | info->control.use_cts_prot && | |
688 | rate->flags & IEEE80211_RATE_ERP_G) | |
689 | rates[i].flags |= IEEE80211_TX_RC_USE_CTS_PROTECT; | |
690 | } | |
691 | } | |
692 | ||
693 | ||
694 | static void rate_control_fill_sta_table(struct ieee80211_sta *sta, | |
695 | struct ieee80211_tx_info *info, | |
696 | struct ieee80211_tx_rate *rates, | |
697 | int max_rates) | |
698 | { | |
699 | struct ieee80211_sta_rates *ratetbl = NULL; | |
700 | int i; | |
701 | ||
702 | if (sta && !info->control.skip_table) | |
703 | ratetbl = rcu_dereference(sta->rates); | |
704 | ||
705 | /* Fill remaining rate slots with data from the sta rate table. */ | |
706 | max_rates = min_t(int, max_rates, IEEE80211_TX_RATE_TABLE_SIZE); | |
707 | for (i = 0; i < max_rates; i++) { | |
708 | if (i < ARRAY_SIZE(info->control.rates) && | |
709 | info->control.rates[i].idx >= 0 && | |
710 | info->control.rates[i].count) { | |
711 | if (rates != info->control.rates) | |
712 | rates[i] = info->control.rates[i]; | |
713 | } else if (ratetbl) { | |
714 | rates[i].idx = ratetbl->rate[i].idx; | |
715 | rates[i].flags = ratetbl->rate[i].flags; | |
716 | if (info->control.use_rts) | |
717 | rates[i].count = ratetbl->rate[i].count_rts; | |
718 | else if (info->control.use_cts_prot) | |
719 | rates[i].count = ratetbl->rate[i].count_cts; | |
720 | else | |
721 | rates[i].count = ratetbl->rate[i].count; | |
722 | } else { | |
723 | rates[i].idx = -1; | |
724 | rates[i].count = 0; | |
725 | } | |
726 | ||
727 | if (rates[i].idx < 0 || !rates[i].count) | |
728 | break; | |
729 | } | |
730 | } | |
731 | ||
90c66bd2 LB |
732 | static bool rate_control_cap_mask(struct ieee80211_sub_if_data *sdata, |
733 | struct ieee80211_supported_band *sband, | |
734 | struct ieee80211_sta *sta, u32 *mask, | |
b119ad6e LB |
735 | u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN], |
736 | u16 vht_mask[NL80211_VHT_NSS_MAX]) | |
90c66bd2 LB |
737 | { |
738 | u32 i, flags; | |
739 | ||
740 | *mask = sdata->rc_rateidx_mask[sband->band]; | |
741 | flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef); | |
742 | for (i = 0; i < sband->n_bitrates; i++) { | |
743 | if ((flags & sband->bitrates[i].flags) != flags) | |
744 | *mask &= ~BIT(i); | |
745 | } | |
746 | ||
747 | if (*mask == (1 << sband->n_bitrates) - 1 && | |
b119ad6e LB |
748 | !sdata->rc_has_mcs_mask[sband->band] && |
749 | !sdata->rc_has_vht_mcs_mask[sband->band]) | |
90c66bd2 LB |
750 | return false; |
751 | ||
752 | if (sdata->rc_has_mcs_mask[sband->band]) | |
753 | memcpy(mcs_mask, sdata->rc_rateidx_mcs_mask[sband->band], | |
754 | IEEE80211_HT_MCS_MASK_LEN); | |
755 | else | |
756 | memset(mcs_mask, 0xff, IEEE80211_HT_MCS_MASK_LEN); | |
757 | ||
b119ad6e LB |
758 | if (sdata->rc_has_vht_mcs_mask[sband->band]) |
759 | memcpy(vht_mask, sdata->rc_rateidx_vht_mcs_mask[sband->band], | |
760 | sizeof(u16) * NL80211_VHT_NSS_MAX); | |
761 | else | |
762 | memset(vht_mask, 0xff, sizeof(u16) * NL80211_VHT_NSS_MAX); | |
763 | ||
90c66bd2 | 764 | if (sta) { |
b119ad6e LB |
765 | __le16 sta_vht_cap; |
766 | u16 sta_vht_mask[NL80211_VHT_NSS_MAX]; | |
767 | ||
90c66bd2 LB |
768 | /* Filter out rates that the STA does not support */ |
769 | *mask &= sta->supp_rates[sband->band]; | |
98a1f828 | 770 | for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) |
90c66bd2 | 771 | mcs_mask[i] &= sta->ht_cap.mcs.rx_mask[i]; |
b119ad6e LB |
772 | |
773 | sta_vht_cap = sta->vht_cap.vht_mcs.rx_mcs_map; | |
774 | ieee80211_get_vht_mask_from_cap(sta_vht_cap, sta_vht_mask); | |
775 | for (i = 0; i < NL80211_VHT_NSS_MAX; i++) | |
776 | vht_mask[i] &= sta_vht_mask[i]; | |
90c66bd2 LB |
777 | } |
778 | ||
779 | return true; | |
780 | } | |
781 | ||
e910867b LB |
782 | static void |
783 | rate_control_apply_mask_ratetbl(struct sta_info *sta, | |
784 | struct ieee80211_supported_band *sband, | |
785 | struct ieee80211_sta_rates *rates) | |
786 | { | |
787 | int i; | |
788 | u32 mask; | |
789 | u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN]; | |
b119ad6e | 790 | u16 vht_mask[NL80211_VHT_NSS_MAX]; |
e910867b LB |
791 | enum nl80211_chan_width chan_width; |
792 | ||
793 | if (!rate_control_cap_mask(sta->sdata, sband, &sta->sta, &mask, | |
b119ad6e | 794 | mcs_mask, vht_mask)) |
e910867b LB |
795 | return; |
796 | ||
797 | chan_width = sta->sdata->vif.bss_conf.chandef.width; | |
798 | for (i = 0; i < IEEE80211_TX_RATE_TABLE_SIZE; i++) { | |
799 | if (rates->rate[i].idx < 0) | |
800 | break; | |
801 | ||
802 | rate_idx_match_mask(&rates->rate[i].idx, &rates->rate[i].flags, | |
b119ad6e LB |
803 | sband, chan_width, mask, mcs_mask, |
804 | vht_mask); | |
e910867b LB |
805 | } |
806 | } | |
807 | ||
0d528d85 FF |
808 | static void rate_control_apply_mask(struct ieee80211_sub_if_data *sdata, |
809 | struct ieee80211_sta *sta, | |
810 | struct ieee80211_supported_band *sband, | |
0d528d85 FF |
811 | struct ieee80211_tx_rate *rates, |
812 | int max_rates) | |
813 | { | |
814 | enum nl80211_chan_width chan_width; | |
815 | u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN]; | |
0d528d85 | 816 | u32 mask; |
b119ad6e | 817 | u16 rate_flags, vht_mask[NL80211_VHT_NSS_MAX]; |
0d528d85 FF |
818 | int i; |
819 | ||
820 | /* | |
821 | * Try to enforce the rateidx mask the user wanted. skip this if the | |
822 | * default mask (allow all rates) is used to save some processing for | |
823 | * the common case. | |
824 | */ | |
b119ad6e LB |
825 | if (!rate_control_cap_mask(sdata, sband, sta, &mask, mcs_mask, |
826 | vht_mask)) | |
0d528d85 FF |
827 | return; |
828 | ||
0d528d85 FF |
829 | /* |
830 | * Make sure the rate index selected for each TX rate is | |
831 | * included in the configured mask and change the rate indexes | |
832 | * if needed. | |
833 | */ | |
834 | chan_width = sdata->vif.bss_conf.chandef.width; | |
835 | for (i = 0; i < max_rates; i++) { | |
836 | /* Skip invalid rates */ | |
837 | if (rates[i].idx < 0) | |
838 | break; | |
839 | ||
90c66bd2 LB |
840 | rate_flags = rates[i].flags; |
841 | rate_idx_match_mask(&rates[i].idx, &rate_flags, sband, | |
b119ad6e | 842 | chan_width, mask, mcs_mask, vht_mask); |
90c66bd2 | 843 | rates[i].flags = rate_flags; |
0d528d85 FF |
844 | } |
845 | } | |
846 | ||
847 | void ieee80211_get_tx_rates(struct ieee80211_vif *vif, | |
848 | struct ieee80211_sta *sta, | |
849 | struct sk_buff *skb, | |
850 | struct ieee80211_tx_rate *dest, | |
851 | int max_rates) | |
852 | { | |
853 | struct ieee80211_sub_if_data *sdata; | |
854 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
855 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
856 | struct ieee80211_supported_band *sband; | |
857 | ||
858 | rate_control_fill_sta_table(sta, info, dest, max_rates); | |
859 | ||
860 | if (!vif) | |
861 | return; | |
862 | ||
863 | sdata = vif_to_sdata(vif); | |
864 | sband = sdata->local->hw.wiphy->bands[info->band]; | |
865 | ||
866 | if (ieee80211_is_data(hdr->frame_control)) | |
35225eb7 | 867 | rate_control_apply_mask(sdata, sta, sband, dest, max_rates); |
0d528d85 FF |
868 | |
869 | if (dest[0].idx < 0) | |
1d2d350b AO |
870 | __rate_control_send_low(&sdata->local->hw, sband, sta, info, |
871 | sdata->rc_rateidx_mask[info->band]); | |
0d528d85 FF |
872 | |
873 | if (sta) | |
874 | rate_fixup_ratelist(vif, sband, info, dest, max_rates); | |
875 | } | |
876 | EXPORT_SYMBOL(ieee80211_get_tx_rates); | |
877 | ||
4b7679a5 | 878 | void rate_control_get_rate(struct ieee80211_sub_if_data *sdata, |
e6a9854b JB |
879 | struct sta_info *sta, |
880 | struct ieee80211_tx_rate_control *txrc) | |
1abbe498 | 881 | { |
4b7679a5 JB |
882 | struct rate_control_ref *ref = sdata->local->rate_ctrl; |
883 | void *priv_sta = NULL; | |
884 | struct ieee80211_sta *ista = NULL; | |
e6a9854b | 885 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); |
1abbe498 | 886 | int i; |
1abbe498 | 887 | |
e1936e94 | 888 | if (sta && test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) { |
4b7679a5 JB |
889 | ista = &sta->sta; |
890 | priv_sta = sta->rate_ctrl_priv; | |
891 | } | |
892 | ||
e6a9854b JB |
893 | for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { |
894 | info->control.rates[i].idx = -1; | |
895 | info->control.rates[i].flags = 0; | |
8617b093 | 896 | info->control.rates[i].count = 0; |
e6a9854b JB |
897 | } |
898 | ||
30686bf7 | 899 | if (ieee80211_hw_check(&sdata->local->hw, HAS_RATE_CONTROL)) |
5affcd6b JO |
900 | return; |
901 | ||
35c347ac JB |
902 | if (ista) { |
903 | spin_lock_bh(&sta->rate_ctrl_lock); | |
904 | ref->ops->get_rate(ref->priv, ista, priv_sta, txrc); | |
905 | spin_unlock_bh(&sta->rate_ctrl_lock); | |
906 | } else { | |
907 | ref->ops->get_rate(ref->priv, NULL, NULL, txrc); | |
908 | } | |
e6a9854b | 909 | |
30686bf7 | 910 | if (ieee80211_hw_check(&sdata->local->hw, SUPPORTS_RC_TABLE)) |
0d528d85 FF |
911 | return; |
912 | ||
913 | ieee80211_get_tx_rates(&sdata->vif, ista, txrc->skb, | |
914 | info->control.rates, | |
915 | ARRAY_SIZE(info->control.rates)); | |
916 | } | |
e6a9854b | 917 | |
0d528d85 FF |
918 | int rate_control_set_rates(struct ieee80211_hw *hw, |
919 | struct ieee80211_sta *pubsta, | |
920 | struct ieee80211_sta_rates *rates) | |
921 | { | |
f815e2b3 | 922 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
f6b3d85f | 923 | struct ieee80211_sta_rates *old; |
e910867b | 924 | struct ieee80211_supported_band *sband; |
0d528d85 | 925 | |
21a8e9dd MSS |
926 | sband = ieee80211_get_sband(sta->sdata); |
927 | if (!sband) | |
928 | return -EINVAL; | |
e910867b | 929 | rate_control_apply_mask_ratetbl(sta, sband, rates); |
f6b3d85f FF |
930 | /* |
931 | * mac80211 guarantees that this function will not be called | |
932 | * concurrently, so the following RCU access is safe, even without | |
933 | * extra locking. This can not be checked easily, so we just set | |
934 | * the condition to true. | |
935 | */ | |
936 | old = rcu_dereference_protected(pubsta->rates, true); | |
0d528d85 FF |
937 | rcu_assign_pointer(pubsta->rates, rates); |
938 | if (old) | |
939 | kfree_rcu(old, rcu_head); | |
940 | ||
f815e2b3 JB |
941 | drv_sta_rate_tbl_update(hw_to_local(hw), sta->sdata, pubsta); |
942 | ||
484a54c2 THJ |
943 | ieee80211_sta_set_expected_throughput(pubsta, sta_get_expected_throughput(sta)); |
944 | ||
0d528d85 | 945 | return 0; |
1abbe498 | 946 | } |
0d528d85 | 947 | EXPORT_SYMBOL(rate_control_set_rates); |
1abbe498 | 948 | |
ff688089 JB |
949 | int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local, |
950 | const char *name) | |
951 | { | |
889cbb91 | 952 | struct rate_control_ref *ref; |
ff688089 JB |
953 | |
954 | ASSERT_RTNL(); | |
af65cd96 | 955 | |
3b8d81e0 | 956 | if (local->open_count) |
ff688089 JB |
957 | return -EBUSY; |
958 | ||
30686bf7 | 959 | if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { |
af65cd96 JB |
960 | if (WARN_ON(!local->ops->set_rts_threshold)) |
961 | return -EINVAL; | |
962 | return 0; | |
963 | } | |
964 | ||
ff688089 JB |
965 | ref = rate_control_alloc(name, local); |
966 | if (!ref) { | |
0fb9a9ec JP |
967 | wiphy_warn(local->hw.wiphy, |
968 | "Failed to select rate control algorithm\n"); | |
ff688089 JB |
969 | return -ENOENT; |
970 | } | |
971 | ||
889cbb91 | 972 | WARN_ON(local->rate_ctrl); |
ff688089 | 973 | local->rate_ctrl = ref; |
ff688089 | 974 | |
0fb9a9ec JP |
975 | wiphy_debug(local->hw.wiphy, "Selected rate control algorithm '%s'\n", |
976 | ref->ops->name); | |
ff688089 | 977 | |
ff688089 JB |
978 | return 0; |
979 | } | |
980 | ||
981 | void rate_control_deinitialize(struct ieee80211_local *local) | |
982 | { | |
983 | struct rate_control_ref *ref; | |
984 | ||
985 | ref = local->rate_ctrl; | |
af65cd96 JB |
986 | |
987 | if (!ref) | |
988 | return; | |
989 | ||
ff688089 | 990 | local->rate_ctrl = NULL; |
a858958b | 991 | rate_control_free(local, ref); |
ff688089 | 992 | } |