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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 | ||
cac8c526 TP |
54 | /* TODO: check for minstrel_s1g ? */ |
55 | if (sband->band == NL80211_BAND_S1GHZ) { | |
12bf8fad | 56 | ieee80211_s1g_sta_rate_init(sta); |
cac8c526 TP |
57 | rcu_read_unlock(); |
58 | return; | |
59 | } | |
60 | ||
eb6d9293 DV |
61 | spin_lock_bh(&sta->rate_ctrl_lock); |
62 | ref->ops->rate_init(ref->priv, sband, &chanctx_conf->def, ista, | |
63 | priv_sta); | |
64 | spin_unlock_bh(&sta->rate_ctrl_lock); | |
65 | rcu_read_unlock(); | |
66 | set_sta_flag(sta, WLAN_STA_RATE_CONTROL); | |
67 | } | |
68 | ||
18fb84d9 FF |
69 | void rate_control_tx_status(struct ieee80211_local *local, |
70 | struct ieee80211_supported_band *sband, | |
71 | struct ieee80211_tx_status *st) | |
72 | { | |
73 | struct rate_control_ref *ref = local->rate_ctrl; | |
74 | struct sta_info *sta = container_of(st->sta, struct sta_info, sta); | |
75 | void *priv_sta = sta->rate_ctrl_priv; | |
76 | ||
77 | if (!ref || !test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) | |
78 | return; | |
79 | ||
80 | spin_lock_bh(&sta->rate_ctrl_lock); | |
81 | if (ref->ops->tx_status_ext) | |
82 | ref->ops->tx_status_ext(ref->priv, sband, priv_sta, st); | |
83 | else if (st->skb) | |
84 | ref->ops->tx_status(ref->priv, sband, st->sta, priv_sta, st->skb); | |
85 | else | |
86 | WARN_ON_ONCE(1); | |
87 | ||
88 | spin_unlock_bh(&sta->rate_ctrl_lock); | |
89 | } | |
90 | ||
eb6d9293 DV |
91 | void rate_control_rate_update(struct ieee80211_local *local, |
92 | struct ieee80211_supported_band *sband, | |
93 | struct sta_info *sta, u32 changed) | |
94 | { | |
95 | struct rate_control_ref *ref = local->rate_ctrl; | |
96 | struct ieee80211_sta *ista = &sta->sta; | |
97 | void *priv_sta = sta->rate_ctrl_priv; | |
98 | struct ieee80211_chanctx_conf *chanctx_conf; | |
99 | ||
100 | if (ref && ref->ops->rate_update) { | |
101 | rcu_read_lock(); | |
102 | ||
103 | chanctx_conf = rcu_dereference(sta->sdata->vif.chanctx_conf); | |
104 | if (WARN_ON(!chanctx_conf)) { | |
105 | rcu_read_unlock(); | |
106 | return; | |
107 | } | |
108 | ||
109 | spin_lock_bh(&sta->rate_ctrl_lock); | |
110 | ref->ops->rate_update(ref->priv, sband, &chanctx_conf->def, | |
111 | ista, priv_sta, changed); | |
112 | spin_unlock_bh(&sta->rate_ctrl_lock); | |
113 | rcu_read_unlock(); | |
114 | } | |
115 | drv_sta_rc_update(local, sta->sdata, &sta->sta, changed); | |
116 | } | |
117 | ||
631ad703 | 118 | int ieee80211_rate_control_register(const struct rate_control_ops *ops) |
f0706e82 JB |
119 | { |
120 | struct rate_control_alg *alg; | |
121 | ||
ac71c691 JB |
122 | if (!ops->name) |
123 | return -EINVAL; | |
124 | ||
999acd9c JB |
125 | mutex_lock(&rate_ctrl_mutex); |
126 | list_for_each_entry(alg, &rate_ctrl_algs, list) { | |
127 | if (!strcmp(alg->ops->name, ops->name)) { | |
128 | /* don't register an algorithm twice */ | |
129 | WARN_ON(1); | |
b808ab16 | 130 | mutex_unlock(&rate_ctrl_mutex); |
999acd9c JB |
131 | return -EALREADY; |
132 | } | |
133 | } | |
134 | ||
dd00cc48 | 135 | alg = kzalloc(sizeof(*alg), GFP_KERNEL); |
f0706e82 | 136 | if (alg == NULL) { |
999acd9c | 137 | mutex_unlock(&rate_ctrl_mutex); |
f0706e82 JB |
138 | return -ENOMEM; |
139 | } | |
f0706e82 JB |
140 | alg->ops = ops; |
141 | ||
f0706e82 JB |
142 | list_add_tail(&alg->list, &rate_ctrl_algs); |
143 | mutex_unlock(&rate_ctrl_mutex); | |
144 | ||
145 | return 0; | |
146 | } | |
147 | EXPORT_SYMBOL(ieee80211_rate_control_register); | |
148 | ||
631ad703 | 149 | void ieee80211_rate_control_unregister(const struct rate_control_ops *ops) |
f0706e82 JB |
150 | { |
151 | struct rate_control_alg *alg; | |
152 | ||
153 | mutex_lock(&rate_ctrl_mutex); | |
154 | list_for_each_entry(alg, &rate_ctrl_algs, list) { | |
155 | if (alg->ops == ops) { | |
156 | list_del(&alg->list); | |
20880e89 | 157 | kfree(alg); |
f0706e82 JB |
158 | break; |
159 | } | |
160 | } | |
161 | mutex_unlock(&rate_ctrl_mutex); | |
f0706e82 JB |
162 | } |
163 | EXPORT_SYMBOL(ieee80211_rate_control_unregister); | |
164 | ||
631ad703 | 165 | static const struct rate_control_ops * |
f0706e82 JB |
166 | ieee80211_try_rate_control_ops_get(const char *name) |
167 | { | |
168 | struct rate_control_alg *alg; | |
631ad703 | 169 | const struct rate_control_ops *ops = NULL; |
f0706e82 | 170 | |
ac71c691 JB |
171 | if (!name) |
172 | return NULL; | |
173 | ||
f0706e82 JB |
174 | mutex_lock(&rate_ctrl_mutex); |
175 | list_for_each_entry(alg, &rate_ctrl_algs, list) { | |
cc01f9b5 JB |
176 | if (!strcmp(alg->ops->name, name)) { |
177 | ops = alg->ops; | |
178 | break; | |
179 | } | |
f0706e82 JB |
180 | } |
181 | mutex_unlock(&rate_ctrl_mutex); | |
182 | return ops; | |
183 | } | |
184 | ||
c21b39ac | 185 | /* Get the rate control algorithm. */ |
631ad703 | 186 | static const struct rate_control_ops * |
f0706e82 JB |
187 | ieee80211_rate_control_ops_get(const char *name) |
188 | { | |
631ad703 | 189 | const struct rate_control_ops *ops; |
c21b39ac | 190 | const char *alg_name; |
f0706e82 | 191 | |
b51d23e4 | 192 | kernel_param_lock(THIS_MODULE); |
ac71c691 | 193 | if (!name) |
c21b39ac SB |
194 | alg_name = ieee80211_default_rc_algo; |
195 | else | |
196 | alg_name = name; | |
ac71c691 | 197 | |
c21b39ac | 198 | ops = ieee80211_try_rate_control_ops_get(alg_name); |
c21b39ac SB |
199 | if (!ops && name) |
200 | /* try default if specific alg requested but not found */ | |
201 | ops = ieee80211_try_rate_control_ops_get(ieee80211_default_rc_algo); | |
202 | ||
93f56de2 MK |
203 | /* Note: check for > 0 is intentional to avoid clang warning */ |
204 | if (!ops && (strlen(CONFIG_MAC80211_RC_DEFAULT) > 0)) | |
205 | /* try built-in one if specific alg requested but not found */ | |
4b475898 | 206 | ops = ieee80211_try_rate_control_ops_get(CONFIG_MAC80211_RC_DEFAULT); |
93f56de2 | 207 | |
b51d23e4 | 208 | kernel_param_unlock(THIS_MODULE); |
4b475898 | 209 | |
f0706e82 JB |
210 | return ops; |
211 | } | |
212 | ||
4b7679a5 JB |
213 | #ifdef CONFIG_MAC80211_DEBUGFS |
214 | static ssize_t rcname_read(struct file *file, char __user *userbuf, | |
215 | size_t count, loff_t *ppos) | |
216 | { | |
217 | struct rate_control_ref *ref = file->private_data; | |
218 | int len = strlen(ref->ops->name); | |
219 | ||
220 | return simple_read_from_buffer(userbuf, count, ppos, | |
221 | ref->ops->name, len); | |
222 | } | |
223 | ||
6cb5f3ea | 224 | const struct file_operations rcname_ops = { |
4b7679a5 | 225 | .read = rcname_read, |
234e3405 | 226 | .open = simple_open, |
6038f373 | 227 | .llseek = default_llseek, |
4b7679a5 JB |
228 | }; |
229 | #endif | |
230 | ||
6cb5f3ea JB |
231 | static struct rate_control_ref * |
232 | rate_control_alloc(const char *name, struct ieee80211_local *local) | |
f0706e82 JB |
233 | { |
234 | struct rate_control_ref *ref; | |
235 | ||
236 | ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL); | |
237 | if (!ref) | |
cc01f9b5 | 238 | return NULL; |
f0706e82 JB |
239 | ref->ops = ieee80211_rate_control_ops_get(name); |
240 | if (!ref->ops) | |
cc01f9b5 | 241 | goto free; |
4b7679a5 | 242 | |
6cb5f3ea | 243 | ref->priv = ref->ops->alloc(&local->hw); |
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 | ||
1821f8b3 TP |
276 | band = sdata->vif.bss_conf.chandef.chan->band; |
277 | if (band == NL80211_BAND_S1GHZ) { | |
278 | /* TODO */ | |
279 | return; | |
280 | } | |
281 | ||
e8e4f528 JB |
282 | if (WARN_ON_ONCE(!basic_rates)) |
283 | return; | |
284 | ||
e8e4f528 JB |
285 | user_mask = sdata->rc_rateidx_mask[band]; |
286 | sband = local->hw.wiphy->bands[band]; | |
287 | ||
288 | if (user_mask & basic_rates) | |
289 | return; | |
290 | ||
291 | sdata_dbg(sdata, | |
292 | "no overlap between basic rates (0x%x) and user mask (0x%x on band %d) - clearing the latter", | |
293 | basic_rates, user_mask, band); | |
294 | sdata->rc_rateidx_mask[band] = (1 << sband->n_bitrates) - 1; | |
295 | } | |
296 | ||
b6f35301 | 297 | static bool rc_no_data_or_no_ack_use_min(struct ieee80211_tx_rate_control *txrc) |
4c6d4f5c LR |
298 | { |
299 | struct sk_buff *skb = txrc->skb; | |
300 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
301 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
302 | __le16 fc; | |
303 | ||
304 | fc = hdr->frame_control; | |
305 | ||
b6f35301 RM |
306 | return (info->flags & (IEEE80211_TX_CTL_NO_ACK | |
307 | IEEE80211_TX_CTL_USE_MINRATE)) || | |
308 | !ieee80211_is_data(fc); | |
4c6d4f5c LR |
309 | } |
310 | ||
1821f8b3 TP |
311 | static void rc_send_low_basicrate(struct ieee80211_tx_rate *rate, |
312 | u32 basic_rates, | |
8f0729b1 | 313 | struct ieee80211_supported_band *sband) |
e00cfce0 JM |
314 | { |
315 | u8 i; | |
316 | ||
1821f8b3 TP |
317 | if (sband->band == NL80211_BAND_S1GHZ) { |
318 | /* TODO */ | |
319 | rate->flags |= IEEE80211_TX_RC_S1G_MCS; | |
320 | rate->idx = 0; | |
321 | return; | |
322 | } | |
323 | ||
e00cfce0 JM |
324 | if (basic_rates == 0) |
325 | return; /* assume basic rates unknown and accept rate */ | |
1821f8b3 | 326 | if (rate->idx < 0) |
e00cfce0 | 327 | return; |
1821f8b3 | 328 | if (basic_rates & (1 << rate->idx)) |
e00cfce0 JM |
329 | return; /* selected rate is a basic rate */ |
330 | ||
1821f8b3 | 331 | for (i = rate->idx + 1; i <= sband->n_bitrates; i++) { |
e00cfce0 | 332 | if (basic_rates & (1 << i)) { |
1821f8b3 | 333 | rate->idx = i; |
e00cfce0 JM |
334 | return; |
335 | } | |
336 | } | |
337 | ||
338 | /* could not find a basic rate; use original selection */ | |
339 | } | |
340 | ||
2103dec1 SW |
341 | static void __rate_control_send_low(struct ieee80211_hw *hw, |
342 | struct ieee80211_supported_band *sband, | |
343 | struct ieee80211_sta *sta, | |
1d2d350b AO |
344 | struct ieee80211_tx_info *info, |
345 | u32 rate_mask) | |
aad14ceb RM |
346 | { |
347 | int i; | |
2103dec1 SW |
348 | u32 rate_flags = |
349 | ieee80211_chandef_rate_flags(&hw->conf.chandef); | |
aad14ceb | 350 | |
1821f8b3 TP |
351 | if (sband->band == NL80211_BAND_S1GHZ) { |
352 | info->control.rates[0].flags |= IEEE80211_TX_RC_S1G_MCS; | |
353 | info->control.rates[0].idx = 0; | |
354 | return; | |
355 | } | |
356 | ||
57fbcce3 | 357 | if ((sband->band == NL80211_BAND_2GHZ) && |
2103dec1 SW |
358 | (info->flags & IEEE80211_TX_CTL_NO_CCK_RATE)) |
359 | rate_flags |= IEEE80211_RATE_ERP_G; | |
360 | ||
361 | info->control.rates[0].idx = 0; | |
aad14ceb | 362 | for (i = 0; i < sband->n_bitrates; i++) { |
1d2d350b AO |
363 | if (!(rate_mask & BIT(i))) |
364 | continue; | |
365 | ||
1431fcb7 AO |
366 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) |
367 | continue; | |
368 | ||
2103dec1 | 369 | if (!rate_supported(sta, sband->band, i)) |
aad14ceb RM |
370 | continue; |
371 | ||
2103dec1 SW |
372 | info->control.rates[0].idx = i; |
373 | break; | |
aad14ceb | 374 | } |
0e5c371a | 375 | WARN_ONCE(i == sband->n_bitrates, |
163a7cdd JB |
376 | "no supported rates for sta %pM (0x%x, band %d) in rate_mask 0x%x with flags 0x%x\n", |
377 | sta ? sta->addr : NULL, | |
ef95d8ba | 378 | sta ? sta->supp_rates[sband->band] : -1, |
163a7cdd | 379 | sband->band, |
0e5c371a | 380 | rate_mask, rate_flags); |
0d528d85 FF |
381 | |
382 | info->control.rates[0].count = | |
383 | (info->flags & IEEE80211_TX_CTL_NO_ACK) ? | |
384 | 1 : hw->max_rate_tries; | |
385 | ||
386 | info->control.skip_table = 1; | |
387 | } | |
388 | ||
aad14ceb | 389 | |
1e87fec9 JB |
390 | static bool rate_control_send_low(struct ieee80211_sta *pubsta, |
391 | struct ieee80211_tx_rate_control *txrc) | |
4c6d4f5c LR |
392 | { |
393 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); | |
dd5b4cc7 | 394 | struct ieee80211_supported_band *sband = txrc->sband; |
06703079 | 395 | struct sta_info *sta; |
dd5b4cc7 | 396 | int mcast_rate; |
06703079 | 397 | bool use_basicrate = false; |
4c6d4f5c | 398 | |
1e87fec9 | 399 | if (!pubsta || rc_no_data_or_no_ack_use_min(txrc)) { |
1d2d350b AO |
400 | __rate_control_send_low(txrc->hw, sband, pubsta, info, |
401 | txrc->rate_idx_mask); | |
0d528d85 | 402 | |
06703079 | 403 | if (!pubsta && txrc->bss) { |
dd5b4cc7 FF |
404 | mcast_rate = txrc->bss_conf->mcast_rate[sband->band]; |
405 | if (mcast_rate > 0) { | |
406 | info->control.rates[0].idx = mcast_rate - 1; | |
407 | return true; | |
408 | } | |
06703079 CYY |
409 | use_basicrate = true; |
410 | } else if (pubsta) { | |
411 | sta = container_of(pubsta, struct sta_info, sta); | |
412 | if (ieee80211_vif_is_mesh(&sta->sdata->vif)) | |
413 | use_basicrate = true; | |
414 | } | |
dd5b4cc7 | 415 | |
06703079 | 416 | if (use_basicrate) |
1821f8b3 | 417 | rc_send_low_basicrate(&info->control.rates[0], |
e00cfce0 | 418 | txrc->bss_conf->basic_rates, |
dd5b4cc7 | 419 | sband); |
06703079 | 420 | |
4c6d4f5c LR |
421 | return true; |
422 | } | |
423 | return false; | |
424 | } | |
4c6d4f5c | 425 | |
90c66bd2 | 426 | static bool rate_idx_match_legacy_mask(s8 *rate_idx, int n_bitrates, u32 mask) |
37eb0b16 JM |
427 | { |
428 | int j; | |
429 | ||
430 | /* See whether the selected rate or anything below it is allowed. */ | |
90c66bd2 | 431 | for (j = *rate_idx; j >= 0; j--) { |
37eb0b16 JM |
432 | if (mask & (1 << j)) { |
433 | /* Okay, found a suitable rate. Use it. */ | |
90c66bd2 | 434 | *rate_idx = j; |
19468413 | 435 | return true; |
37eb0b16 JM |
436 | } |
437 | } | |
438 | ||
439 | /* Try to find a higher rate that would be allowed */ | |
90c66bd2 | 440 | for (j = *rate_idx + 1; j < n_bitrates; j++) { |
37eb0b16 JM |
441 | if (mask & (1 << j)) { |
442 | /* Okay, found a suitable rate. Use it. */ | |
90c66bd2 | 443 | *rate_idx = j; |
19468413 SW |
444 | return true; |
445 | } | |
446 | } | |
447 | return false; | |
448 | } | |
449 | ||
90c66bd2 | 450 | static bool rate_idx_match_mcs_mask(s8 *rate_idx, u8 *mcs_mask) |
19468413 SW |
451 | { |
452 | int i, j; | |
453 | int ridx, rbit; | |
454 | ||
90c66bd2 LB |
455 | ridx = *rate_idx / 8; |
456 | rbit = *rate_idx % 8; | |
19468413 SW |
457 | |
458 | /* sanity check */ | |
910570b5 | 459 | if (ridx < 0 || ridx >= IEEE80211_HT_MCS_MASK_LEN) |
19468413 SW |
460 | return false; |
461 | ||
462 | /* See whether the selected rate or anything below it is allowed. */ | |
463 | for (i = ridx; i >= 0; i--) { | |
464 | for (j = rbit; j >= 0; j--) | |
465 | if (mcs_mask[i] & BIT(j)) { | |
90c66bd2 | 466 | *rate_idx = i * 8 + j; |
19468413 SW |
467 | return true; |
468 | } | |
469 | rbit = 7; | |
470 | } | |
471 | ||
472 | /* Try to find a higher rate that would be allowed */ | |
90c66bd2 LB |
473 | ridx = (*rate_idx + 1) / 8; |
474 | rbit = (*rate_idx + 1) % 8; | |
19468413 SW |
475 | |
476 | for (i = ridx; i < IEEE80211_HT_MCS_MASK_LEN; i++) { | |
477 | for (j = rbit; j < 8; j++) | |
478 | if (mcs_mask[i] & BIT(j)) { | |
90c66bd2 | 479 | *rate_idx = i * 8 + j; |
19468413 SW |
480 | return true; |
481 | } | |
482 | rbit = 0; | |
483 | } | |
484 | return false; | |
485 | } | |
486 | ||
b119ad6e LB |
487 | static bool rate_idx_match_vht_mcs_mask(s8 *rate_idx, u16 *vht_mask) |
488 | { | |
489 | int i, j; | |
490 | int ridx, rbit; | |
491 | ||
492 | ridx = *rate_idx >> 4; | |
493 | rbit = *rate_idx & 0xf; | |
494 | ||
495 | if (ridx < 0 || ridx >= NL80211_VHT_NSS_MAX) | |
496 | return false; | |
19468413 | 497 | |
b119ad6e LB |
498 | /* See whether the selected rate or anything below it is allowed. */ |
499 | for (i = ridx; i >= 0; i--) { | |
500 | for (j = rbit; j >= 0; j--) { | |
501 | if (vht_mask[i] & BIT(j)) { | |
502 | *rate_idx = (i << 4) | j; | |
503 | return true; | |
504 | } | |
505 | } | |
506 | rbit = 15; | |
507 | } | |
508 | ||
509 | /* Try to find a higher rate that would be allowed */ | |
510 | ridx = (*rate_idx + 1) >> 4; | |
511 | rbit = (*rate_idx + 1) & 0xf; | |
512 | ||
513 | for (i = ridx; i < NL80211_VHT_NSS_MAX; i++) { | |
514 | for (j = rbit; j < 16; j++) { | |
515 | if (vht_mask[i] & BIT(j)) { | |
516 | *rate_idx = (i << 4) | j; | |
517 | return true; | |
518 | } | |
519 | } | |
520 | rbit = 0; | |
521 | } | |
522 | return false; | |
523 | } | |
19468413 | 524 | |
90c66bd2 | 525 | static void rate_idx_match_mask(s8 *rate_idx, u16 *rate_flags, |
0d528d85 FF |
526 | struct ieee80211_supported_band *sband, |
527 | enum nl80211_chan_width chan_width, | |
19468413 | 528 | u32 mask, |
b119ad6e LB |
529 | u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN], |
530 | u16 vht_mask[NL80211_VHT_NSS_MAX]) | |
19468413 | 531 | { |
b119ad6e LB |
532 | if (*rate_flags & IEEE80211_TX_RC_VHT_MCS) { |
533 | /* handle VHT rates */ | |
534 | if (rate_idx_match_vht_mcs_mask(rate_idx, vht_mask)) | |
535 | return; | |
536 | ||
537 | *rate_idx = 0; | |
538 | /* keep protection flags */ | |
539 | *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS | | |
540 | IEEE80211_TX_RC_USE_CTS_PROTECT | | |
541 | IEEE80211_TX_RC_USE_SHORT_PREAMBLE); | |
542 | ||
543 | *rate_flags |= IEEE80211_TX_RC_MCS; | |
544 | if (chan_width == NL80211_CHAN_WIDTH_40) | |
545 | *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; | |
546 | ||
547 | if (rate_idx_match_mcs_mask(rate_idx, mcs_mask)) | |
548 | return; | |
549 | ||
550 | /* also try the legacy rates. */ | |
551 | *rate_flags &= ~(IEEE80211_TX_RC_MCS | | |
552 | IEEE80211_TX_RC_40_MHZ_WIDTH); | |
553 | if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates, | |
554 | mask)) | |
555 | return; | |
556 | } else if (*rate_flags & IEEE80211_TX_RC_MCS) { | |
557 | /* handle HT rates */ | |
90c66bd2 | 558 | if (rate_idx_match_mcs_mask(rate_idx, mcs_mask)) |
19468413 SW |
559 | return; |
560 | ||
561 | /* also try the legacy rates. */ | |
90c66bd2 | 562 | *rate_idx = 0; |
19468413 | 563 | /* keep protection flags */ |
90c66bd2 LB |
564 | *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS | |
565 | IEEE80211_TX_RC_USE_CTS_PROTECT | | |
566 | IEEE80211_TX_RC_USE_SHORT_PREAMBLE); | |
567 | if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates, | |
568 | mask)) | |
19468413 | 569 | return; |
b119ad6e | 570 | } else { |
19468413 | 571 | /* handle legacy rates */ |
90c66bd2 LB |
572 | if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates, |
573 | mask)) | |
19468413 SW |
574 | return; |
575 | ||
576 | /* if HT BSS, and we handle a data frame, also try HT rates */ | |
0418a445 SW |
577 | switch (chan_width) { |
578 | case NL80211_CHAN_WIDTH_20_NOHT: | |
579 | case NL80211_CHAN_WIDTH_5: | |
580 | case NL80211_CHAN_WIDTH_10: | |
19468413 | 581 | return; |
0418a445 SW |
582 | default: |
583 | break; | |
584 | } | |
19468413 | 585 | |
90c66bd2 | 586 | *rate_idx = 0; |
19468413 | 587 | /* keep protection flags */ |
90c66bd2 LB |
588 | *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS | |
589 | IEEE80211_TX_RC_USE_CTS_PROTECT | | |
590 | IEEE80211_TX_RC_USE_SHORT_PREAMBLE); | |
19468413 | 591 | |
90c66bd2 | 592 | *rate_flags |= IEEE80211_TX_RC_MCS; |
19468413 | 593 | |
0d528d85 | 594 | if (chan_width == NL80211_CHAN_WIDTH_40) |
90c66bd2 | 595 | *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; |
19468413 | 596 | |
90c66bd2 | 597 | if (rate_idx_match_mcs_mask(rate_idx, mcs_mask)) |
37eb0b16 | 598 | return; |
37eb0b16 JM |
599 | } |
600 | ||
601 | /* | |
602 | * Uh.. No suitable rate exists. This should not really happen with | |
603 | * sane TX rate mask configurations. However, should someone manage to | |
604 | * configure supported rates and TX rate mask in incompatible way, | |
605 | * allow the frame to be transmitted with whatever the rate control | |
606 | * selected. | |
607 | */ | |
608 | } | |
609 | ||
0d528d85 FF |
610 | static void rate_fixup_ratelist(struct ieee80211_vif *vif, |
611 | struct ieee80211_supported_band *sband, | |
612 | struct ieee80211_tx_info *info, | |
613 | struct ieee80211_tx_rate *rates, | |
614 | int max_rates) | |
615 | { | |
616 | struct ieee80211_rate *rate; | |
617 | bool inval = false; | |
618 | int i; | |
619 | ||
620 | /* | |
621 | * Set up the RTS/CTS rate as the fastest basic rate | |
622 | * that is not faster than the data rate unless there | |
623 | * is no basic rate slower than the data rate, in which | |
624 | * case we pick the slowest basic rate | |
625 | * | |
626 | * XXX: Should this check all retry rates? | |
627 | */ | |
336004e2 FF |
628 | if (!(rates[0].flags & |
629 | (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))) { | |
0d528d85 | 630 | u32 basic_rates = vif->bss_conf.basic_rates; |
c7abf25a | 631 | s8 baserate = basic_rates ? ffs(basic_rates) - 1 : 0; |
0d528d85 FF |
632 | |
633 | rate = &sband->bitrates[rates[0].idx]; | |
634 | ||
635 | for (i = 0; i < sband->n_bitrates; i++) { | |
636 | /* must be a basic rate */ | |
637 | if (!(basic_rates & BIT(i))) | |
638 | continue; | |
639 | /* must not be faster than the data rate */ | |
640 | if (sband->bitrates[i].bitrate > rate->bitrate) | |
641 | continue; | |
642 | /* maximum */ | |
643 | if (sband->bitrates[baserate].bitrate < | |
644 | sband->bitrates[i].bitrate) | |
645 | baserate = i; | |
646 | } | |
647 | ||
648 | info->control.rts_cts_rate_idx = baserate; | |
649 | } | |
650 | ||
651 | for (i = 0; i < max_rates; i++) { | |
652 | /* | |
653 | * make sure there's no valid rate following | |
654 | * an invalid one, just in case drivers don't | |
655 | * take the API seriously to stop at -1. | |
656 | */ | |
657 | if (inval) { | |
658 | rates[i].idx = -1; | |
659 | continue; | |
660 | } | |
661 | if (rates[i].idx < 0) { | |
662 | inval = true; | |
663 | continue; | |
664 | } | |
665 | ||
666 | /* | |
667 | * For now assume MCS is already set up correctly, this | |
668 | * needs to be fixed. | |
669 | */ | |
670 | if (rates[i].flags & IEEE80211_TX_RC_MCS) { | |
671 | WARN_ON(rates[i].idx > 76); | |
672 | ||
673 | if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) && | |
674 | info->control.use_cts_prot) | |
675 | rates[i].flags |= | |
676 | IEEE80211_TX_RC_USE_CTS_PROTECT; | |
677 | continue; | |
678 | } | |
679 | ||
680 | if (rates[i].flags & IEEE80211_TX_RC_VHT_MCS) { | |
681 | WARN_ON(ieee80211_rate_get_vht_mcs(&rates[i]) > 9); | |
682 | continue; | |
683 | } | |
684 | ||
685 | /* set up RTS protection if desired */ | |
686 | if (info->control.use_rts) { | |
687 | rates[i].flags |= IEEE80211_TX_RC_USE_RTS_CTS; | |
688 | info->control.use_cts_prot = false; | |
689 | } | |
690 | ||
691 | /* RC is busted */ | |
692 | if (WARN_ON_ONCE(rates[i].idx >= sband->n_bitrates)) { | |
693 | rates[i].idx = -1; | |
694 | continue; | |
695 | } | |
696 | ||
697 | rate = &sband->bitrates[rates[i].idx]; | |
698 | ||
699 | /* set up short preamble */ | |
700 | if (info->control.short_preamble && | |
701 | rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) | |
702 | rates[i].flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE; | |
703 | ||
704 | /* set up G protection */ | |
705 | if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) && | |
706 | info->control.use_cts_prot && | |
707 | rate->flags & IEEE80211_RATE_ERP_G) | |
708 | rates[i].flags |= IEEE80211_TX_RC_USE_CTS_PROTECT; | |
709 | } | |
710 | } | |
711 | ||
712 | ||
713 | static void rate_control_fill_sta_table(struct ieee80211_sta *sta, | |
714 | struct ieee80211_tx_info *info, | |
715 | struct ieee80211_tx_rate *rates, | |
716 | int max_rates) | |
717 | { | |
718 | struct ieee80211_sta_rates *ratetbl = NULL; | |
719 | int i; | |
720 | ||
721 | if (sta && !info->control.skip_table) | |
722 | ratetbl = rcu_dereference(sta->rates); | |
723 | ||
724 | /* Fill remaining rate slots with data from the sta rate table. */ | |
725 | max_rates = min_t(int, max_rates, IEEE80211_TX_RATE_TABLE_SIZE); | |
726 | for (i = 0; i < max_rates; i++) { | |
727 | if (i < ARRAY_SIZE(info->control.rates) && | |
728 | info->control.rates[i].idx >= 0 && | |
729 | info->control.rates[i].count) { | |
730 | if (rates != info->control.rates) | |
731 | rates[i] = info->control.rates[i]; | |
732 | } else if (ratetbl) { | |
733 | rates[i].idx = ratetbl->rate[i].idx; | |
734 | rates[i].flags = ratetbl->rate[i].flags; | |
735 | if (info->control.use_rts) | |
736 | rates[i].count = ratetbl->rate[i].count_rts; | |
737 | else if (info->control.use_cts_prot) | |
738 | rates[i].count = ratetbl->rate[i].count_cts; | |
739 | else | |
740 | rates[i].count = ratetbl->rate[i].count; | |
741 | } else { | |
742 | rates[i].idx = -1; | |
743 | rates[i].count = 0; | |
744 | } | |
745 | ||
746 | if (rates[i].idx < 0 || !rates[i].count) | |
747 | break; | |
748 | } | |
749 | } | |
750 | ||
90c66bd2 LB |
751 | static bool rate_control_cap_mask(struct ieee80211_sub_if_data *sdata, |
752 | struct ieee80211_supported_band *sband, | |
753 | struct ieee80211_sta *sta, u32 *mask, | |
b119ad6e LB |
754 | u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN], |
755 | u16 vht_mask[NL80211_VHT_NSS_MAX]) | |
90c66bd2 LB |
756 | { |
757 | u32 i, flags; | |
758 | ||
759 | *mask = sdata->rc_rateidx_mask[sband->band]; | |
760 | flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef); | |
761 | for (i = 0; i < sband->n_bitrates; i++) { | |
762 | if ((flags & sband->bitrates[i].flags) != flags) | |
763 | *mask &= ~BIT(i); | |
764 | } | |
765 | ||
766 | if (*mask == (1 << sband->n_bitrates) - 1 && | |
b119ad6e LB |
767 | !sdata->rc_has_mcs_mask[sband->band] && |
768 | !sdata->rc_has_vht_mcs_mask[sband->band]) | |
90c66bd2 LB |
769 | return false; |
770 | ||
771 | if (sdata->rc_has_mcs_mask[sband->band]) | |
772 | memcpy(mcs_mask, sdata->rc_rateidx_mcs_mask[sband->band], | |
773 | IEEE80211_HT_MCS_MASK_LEN); | |
774 | else | |
775 | memset(mcs_mask, 0xff, IEEE80211_HT_MCS_MASK_LEN); | |
776 | ||
b119ad6e LB |
777 | if (sdata->rc_has_vht_mcs_mask[sband->band]) |
778 | memcpy(vht_mask, sdata->rc_rateidx_vht_mcs_mask[sband->band], | |
779 | sizeof(u16) * NL80211_VHT_NSS_MAX); | |
780 | else | |
781 | memset(vht_mask, 0xff, sizeof(u16) * NL80211_VHT_NSS_MAX); | |
782 | ||
90c66bd2 | 783 | if (sta) { |
b119ad6e LB |
784 | __le16 sta_vht_cap; |
785 | u16 sta_vht_mask[NL80211_VHT_NSS_MAX]; | |
786 | ||
90c66bd2 LB |
787 | /* Filter out rates that the STA does not support */ |
788 | *mask &= sta->supp_rates[sband->band]; | |
98a1f828 | 789 | for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) |
90c66bd2 | 790 | mcs_mask[i] &= sta->ht_cap.mcs.rx_mask[i]; |
b119ad6e LB |
791 | |
792 | sta_vht_cap = sta->vht_cap.vht_mcs.rx_mcs_map; | |
793 | ieee80211_get_vht_mask_from_cap(sta_vht_cap, sta_vht_mask); | |
794 | for (i = 0; i < NL80211_VHT_NSS_MAX; i++) | |
795 | vht_mask[i] &= sta_vht_mask[i]; | |
90c66bd2 LB |
796 | } |
797 | ||
798 | return true; | |
799 | } | |
800 | ||
e910867b LB |
801 | static void |
802 | rate_control_apply_mask_ratetbl(struct sta_info *sta, | |
803 | struct ieee80211_supported_band *sband, | |
804 | struct ieee80211_sta_rates *rates) | |
805 | { | |
806 | int i; | |
807 | u32 mask; | |
808 | u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN]; | |
b119ad6e | 809 | u16 vht_mask[NL80211_VHT_NSS_MAX]; |
e910867b LB |
810 | enum nl80211_chan_width chan_width; |
811 | ||
812 | if (!rate_control_cap_mask(sta->sdata, sband, &sta->sta, &mask, | |
b119ad6e | 813 | mcs_mask, vht_mask)) |
e910867b LB |
814 | return; |
815 | ||
816 | chan_width = sta->sdata->vif.bss_conf.chandef.width; | |
817 | for (i = 0; i < IEEE80211_TX_RATE_TABLE_SIZE; i++) { | |
818 | if (rates->rate[i].idx < 0) | |
819 | break; | |
820 | ||
821 | rate_idx_match_mask(&rates->rate[i].idx, &rates->rate[i].flags, | |
b119ad6e LB |
822 | sband, chan_width, mask, mcs_mask, |
823 | vht_mask); | |
e910867b LB |
824 | } |
825 | } | |
826 | ||
0d528d85 FF |
827 | static void rate_control_apply_mask(struct ieee80211_sub_if_data *sdata, |
828 | struct ieee80211_sta *sta, | |
829 | struct ieee80211_supported_band *sband, | |
0d528d85 FF |
830 | struct ieee80211_tx_rate *rates, |
831 | int max_rates) | |
832 | { | |
833 | enum nl80211_chan_width chan_width; | |
834 | u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN]; | |
0d528d85 | 835 | u32 mask; |
b119ad6e | 836 | u16 rate_flags, vht_mask[NL80211_VHT_NSS_MAX]; |
0d528d85 FF |
837 | int i; |
838 | ||
839 | /* | |
840 | * Try to enforce the rateidx mask the user wanted. skip this if the | |
841 | * default mask (allow all rates) is used to save some processing for | |
842 | * the common case. | |
843 | */ | |
b119ad6e LB |
844 | if (!rate_control_cap_mask(sdata, sband, sta, &mask, mcs_mask, |
845 | vht_mask)) | |
0d528d85 FF |
846 | return; |
847 | ||
0d528d85 FF |
848 | /* |
849 | * Make sure the rate index selected for each TX rate is | |
850 | * included in the configured mask and change the rate indexes | |
851 | * if needed. | |
852 | */ | |
853 | chan_width = sdata->vif.bss_conf.chandef.width; | |
854 | for (i = 0; i < max_rates; i++) { | |
855 | /* Skip invalid rates */ | |
856 | if (rates[i].idx < 0) | |
857 | break; | |
858 | ||
90c66bd2 LB |
859 | rate_flags = rates[i].flags; |
860 | rate_idx_match_mask(&rates[i].idx, &rate_flags, sband, | |
b119ad6e | 861 | chan_width, mask, mcs_mask, vht_mask); |
90c66bd2 | 862 | rates[i].flags = rate_flags; |
0d528d85 FF |
863 | } |
864 | } | |
865 | ||
866 | void ieee80211_get_tx_rates(struct ieee80211_vif *vif, | |
867 | struct ieee80211_sta *sta, | |
868 | struct sk_buff *skb, | |
869 | struct ieee80211_tx_rate *dest, | |
870 | int max_rates) | |
871 | { | |
872 | struct ieee80211_sub_if_data *sdata; | |
873 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
874 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
875 | struct ieee80211_supported_band *sband; | |
876 | ||
877 | rate_control_fill_sta_table(sta, info, dest, max_rates); | |
878 | ||
879 | if (!vif) | |
880 | return; | |
881 | ||
882 | sdata = vif_to_sdata(vif); | |
883 | sband = sdata->local->hw.wiphy->bands[info->band]; | |
884 | ||
885 | if (ieee80211_is_data(hdr->frame_control)) | |
35225eb7 | 886 | rate_control_apply_mask(sdata, sta, sband, dest, max_rates); |
0d528d85 FF |
887 | |
888 | if (dest[0].idx < 0) | |
1d2d350b AO |
889 | __rate_control_send_low(&sdata->local->hw, sband, sta, info, |
890 | sdata->rc_rateidx_mask[info->band]); | |
0d528d85 FF |
891 | |
892 | if (sta) | |
893 | rate_fixup_ratelist(vif, sband, info, dest, max_rates); | |
894 | } | |
895 | EXPORT_SYMBOL(ieee80211_get_tx_rates); | |
896 | ||
4b7679a5 | 897 | void rate_control_get_rate(struct ieee80211_sub_if_data *sdata, |
e6a9854b JB |
898 | struct sta_info *sta, |
899 | struct ieee80211_tx_rate_control *txrc) | |
1abbe498 | 900 | { |
4b7679a5 JB |
901 | struct rate_control_ref *ref = sdata->local->rate_ctrl; |
902 | void *priv_sta = NULL; | |
903 | struct ieee80211_sta *ista = NULL; | |
e6a9854b | 904 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); |
1abbe498 | 905 | int i; |
1abbe498 | 906 | |
e6a9854b JB |
907 | for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { |
908 | info->control.rates[i].idx = -1; | |
909 | info->control.rates[i].flags = 0; | |
8617b093 | 910 | info->control.rates[i].count = 0; |
e6a9854b JB |
911 | } |
912 | ||
583a7a34 | 913 | if (rate_control_send_low(sta ? &sta->sta : NULL, txrc)) |
5affcd6b JO |
914 | return; |
915 | ||
583a7a34 | 916 | if (ieee80211_hw_check(&sdata->local->hw, HAS_RATE_CONTROL)) |
1e87fec9 JB |
917 | return; |
918 | ||
bd718fc1 JB |
919 | if (sta && test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) { |
920 | ista = &sta->sta; | |
921 | priv_sta = sta->rate_ctrl_priv; | |
922 | } | |
923 | ||
35c347ac JB |
924 | if (ista) { |
925 | spin_lock_bh(&sta->rate_ctrl_lock); | |
926 | ref->ops->get_rate(ref->priv, ista, priv_sta, txrc); | |
927 | spin_unlock_bh(&sta->rate_ctrl_lock); | |
928 | } else { | |
1e87fec9 | 929 | rate_control_send_low(NULL, txrc); |
35c347ac | 930 | } |
e6a9854b | 931 | |
30686bf7 | 932 | if (ieee80211_hw_check(&sdata->local->hw, SUPPORTS_RC_TABLE)) |
0d528d85 FF |
933 | return; |
934 | ||
935 | ieee80211_get_tx_rates(&sdata->vif, ista, txrc->skb, | |
936 | info->control.rates, | |
937 | ARRAY_SIZE(info->control.rates)); | |
938 | } | |
e6a9854b | 939 | |
0d528d85 FF |
940 | int rate_control_set_rates(struct ieee80211_hw *hw, |
941 | struct ieee80211_sta *pubsta, | |
942 | struct ieee80211_sta_rates *rates) | |
943 | { | |
f815e2b3 | 944 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
f6b3d85f | 945 | struct ieee80211_sta_rates *old; |
e910867b | 946 | struct ieee80211_supported_band *sband; |
0d528d85 | 947 | |
21a8e9dd MSS |
948 | sband = ieee80211_get_sband(sta->sdata); |
949 | if (!sband) | |
950 | return -EINVAL; | |
e910867b | 951 | rate_control_apply_mask_ratetbl(sta, sband, rates); |
f6b3d85f FF |
952 | /* |
953 | * mac80211 guarantees that this function will not be called | |
954 | * concurrently, so the following RCU access is safe, even without | |
955 | * extra locking. This can not be checked easily, so we just set | |
956 | * the condition to true. | |
957 | */ | |
958 | old = rcu_dereference_protected(pubsta->rates, true); | |
0d528d85 FF |
959 | rcu_assign_pointer(pubsta->rates, rates); |
960 | if (old) | |
961 | kfree_rcu(old, rcu_head); | |
962 | ||
f815e2b3 JB |
963 | drv_sta_rate_tbl_update(hw_to_local(hw), sta->sdata, pubsta); |
964 | ||
484a54c2 THJ |
965 | ieee80211_sta_set_expected_throughput(pubsta, sta_get_expected_throughput(sta)); |
966 | ||
0d528d85 | 967 | return 0; |
1abbe498 | 968 | } |
0d528d85 | 969 | EXPORT_SYMBOL(rate_control_set_rates); |
1abbe498 | 970 | |
ff688089 JB |
971 | int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local, |
972 | const char *name) | |
973 | { | |
889cbb91 | 974 | struct rate_control_ref *ref; |
ff688089 JB |
975 | |
976 | ASSERT_RTNL(); | |
af65cd96 | 977 | |
3b8d81e0 | 978 | if (local->open_count) |
ff688089 JB |
979 | return -EBUSY; |
980 | ||
30686bf7 | 981 | if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { |
af65cd96 JB |
982 | if (WARN_ON(!local->ops->set_rts_threshold)) |
983 | return -EINVAL; | |
984 | return 0; | |
985 | } | |
986 | ||
ff688089 JB |
987 | ref = rate_control_alloc(name, local); |
988 | if (!ref) { | |
0fb9a9ec JP |
989 | wiphy_warn(local->hw.wiphy, |
990 | "Failed to select rate control algorithm\n"); | |
ff688089 JB |
991 | return -ENOENT; |
992 | } | |
993 | ||
889cbb91 | 994 | WARN_ON(local->rate_ctrl); |
ff688089 | 995 | local->rate_ctrl = ref; |
ff688089 | 996 | |
0fb9a9ec JP |
997 | wiphy_debug(local->hw.wiphy, "Selected rate control algorithm '%s'\n", |
998 | ref->ops->name); | |
ff688089 | 999 | |
ff688089 JB |
1000 | return 0; |
1001 | } | |
1002 | ||
1003 | void rate_control_deinitialize(struct ieee80211_local *local) | |
1004 | { | |
1005 | struct rate_control_ref *ref; | |
1006 | ||
1007 | ref = local->rate_ctrl; | |
af65cd96 JB |
1008 | |
1009 | if (!ref) | |
1010 | return; | |
1011 | ||
ff688089 | 1012 | local->rate_ctrl = NULL; |
a858958b | 1013 | rate_control_free(local, ref); |
ff688089 | 1014 | } |