Commit | Line | Data |
---|---|---|
f0706e82 JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz> | |
5 | * | |
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> | |
ff688089 | 12 | #include <linux/rtnetlink.h> |
3a9a231d | 13 | #include <linux/module.h> |
cc01f9b5 | 14 | #include <linux/slab.h> |
2c8dccc7 | 15 | #include "rate.h" |
f0706e82 | 16 | #include "ieee80211_i.h" |
4b7679a5 | 17 | #include "debugfs.h" |
f0706e82 JB |
18 | |
19 | struct rate_control_alg { | |
20 | struct list_head list; | |
631ad703 | 21 | const struct rate_control_ops *ops; |
f0706e82 JB |
22 | }; |
23 | ||
24 | static LIST_HEAD(rate_ctrl_algs); | |
25 | static DEFINE_MUTEX(rate_ctrl_mutex); | |
26 | ||
c21b39ac SB |
27 | static char *ieee80211_default_rc_algo = CONFIG_MAC80211_RC_DEFAULT; |
28 | module_param(ieee80211_default_rc_algo, charp, 0644); | |
29 | MODULE_PARM_DESC(ieee80211_default_rc_algo, | |
30 | "Default rate control algorithm for mac80211 to use"); | |
31 | ||
eb6d9293 DV |
32 | void 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 | ||
64 | void 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 | ||
631ad703 | 91 | int ieee80211_rate_control_register(const struct rate_control_ops *ops) |
f0706e82 JB |
92 | { |
93 | struct rate_control_alg *alg; | |
94 | ||
ac71c691 JB |
95 | if (!ops->name) |
96 | return -EINVAL; | |
97 | ||
999acd9c JB |
98 | 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); | |
b808ab16 | 103 | mutex_unlock(&rate_ctrl_mutex); |
999acd9c JB |
104 | return -EALREADY; |
105 | } | |
106 | } | |
107 | ||
dd00cc48 | 108 | alg = kzalloc(sizeof(*alg), GFP_KERNEL); |
f0706e82 | 109 | if (alg == NULL) { |
999acd9c | 110 | mutex_unlock(&rate_ctrl_mutex); |
f0706e82 JB |
111 | return -ENOMEM; |
112 | } | |
f0706e82 JB |
113 | alg->ops = ops; |
114 | ||
f0706e82 JB |
115 | list_add_tail(&alg->list, &rate_ctrl_algs); |
116 | mutex_unlock(&rate_ctrl_mutex); | |
117 | ||
118 | return 0; | |
119 | } | |
120 | EXPORT_SYMBOL(ieee80211_rate_control_register); | |
121 | ||
631ad703 | 122 | void ieee80211_rate_control_unregister(const struct rate_control_ops *ops) |
f0706e82 JB |
123 | { |
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); | |
20880e89 | 130 | kfree(alg); |
f0706e82 JB |
131 | break; |
132 | } | |
133 | } | |
134 | mutex_unlock(&rate_ctrl_mutex); | |
f0706e82 JB |
135 | } |
136 | EXPORT_SYMBOL(ieee80211_rate_control_unregister); | |
137 | ||
631ad703 | 138 | static const struct rate_control_ops * |
f0706e82 JB |
139 | ieee80211_try_rate_control_ops_get(const char *name) |
140 | { | |
141 | struct rate_control_alg *alg; | |
631ad703 | 142 | const struct rate_control_ops *ops = NULL; |
f0706e82 | 143 | |
ac71c691 JB |
144 | if (!name) |
145 | return NULL; | |
146 | ||
f0706e82 JB |
147 | mutex_lock(&rate_ctrl_mutex); |
148 | list_for_each_entry(alg, &rate_ctrl_algs, list) { | |
cc01f9b5 JB |
149 | if (!strcmp(alg->ops->name, name)) { |
150 | ops = alg->ops; | |
151 | break; | |
152 | } | |
f0706e82 JB |
153 | } |
154 | mutex_unlock(&rate_ctrl_mutex); | |
155 | return ops; | |
156 | } | |
157 | ||
c21b39ac | 158 | /* Get the rate control algorithm. */ |
631ad703 | 159 | static const struct rate_control_ops * |
f0706e82 JB |
160 | ieee80211_rate_control_ops_get(const char *name) |
161 | { | |
631ad703 | 162 | const struct rate_control_ops *ops; |
c21b39ac | 163 | const char *alg_name; |
f0706e82 | 164 | |
b51d23e4 | 165 | kernel_param_lock(THIS_MODULE); |
ac71c691 | 166 | if (!name) |
c21b39ac SB |
167 | alg_name = ieee80211_default_rc_algo; |
168 | else | |
169 | alg_name = name; | |
ac71c691 | 170 | |
c21b39ac | 171 | ops = ieee80211_try_rate_control_ops_get(alg_name); |
c21b39ac SB |
172 | 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 | ||
4b475898 JB |
176 | /* 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); | |
b51d23e4 | 179 | kernel_param_unlock(THIS_MODULE); |
4b475898 | 180 | |
f0706e82 JB |
181 | return ops; |
182 | } | |
183 | ||
4b7679a5 JB |
184 | #ifdef CONFIG_MAC80211_DEBUGFS |
185 | static 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 | ||
195 | static const struct file_operations rcname_ops = { | |
196 | .read = rcname_read, | |
234e3405 | 197 | .open = simple_open, |
6038f373 | 198 | .llseek = default_llseek, |
4b7679a5 JB |
199 | }; |
200 | #endif | |
201 | ||
209c671d | 202 | static struct rate_control_ref *rate_control_alloc(const char *name, |
f0706e82 JB |
203 | struct ieee80211_local *local) |
204 | { | |
4b7679a5 | 205 | struct dentry *debugfsdir = NULL; |
f0706e82 JB |
206 | struct rate_control_ref *ref; |
207 | ||
208 | ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL); | |
209 | if (!ref) | |
cc01f9b5 | 210 | return NULL; |
4b7679a5 | 211 | ref->local = local; |
f0706e82 JB |
212 | ref->ops = ieee80211_rate_control_ops_get(name); |
213 | if (!ref->ops) | |
cc01f9b5 | 214 | goto free; |
4b7679a5 JB |
215 | |
216 | #ifdef CONFIG_MAC80211_DEBUGFS | |
217 | debugfsdir = debugfs_create_dir("rc", local->hw.wiphy->debugfsdir); | |
218 | local->debugfs.rcdir = debugfsdir; | |
7bcfaf2f | 219 | debugfs_create_file("name", 0400, debugfsdir, ref, &rcname_ops); |
4b7679a5 JB |
220 | #endif |
221 | ||
222 | ref->priv = ref->ops->alloc(&local->hw, debugfsdir); | |
f0706e82 | 223 | if (!ref->priv) |
cc01f9b5 | 224 | goto free; |
f0706e82 JB |
225 | return ref; |
226 | ||
cc01f9b5 | 227 | free: |
f0706e82 | 228 | kfree(ref); |
f0706e82 JB |
229 | return NULL; |
230 | } | |
231 | ||
889cbb91 | 232 | static void rate_control_free(struct rate_control_ref *ctrl_ref) |
f0706e82 | 233 | { |
f0706e82 | 234 | ctrl_ref->ops->free(ctrl_ref->priv); |
4b7679a5 JB |
235 | |
236 | #ifdef CONFIG_MAC80211_DEBUGFS | |
7bcfaf2f | 237 | debugfs_remove_recursive(ctrl_ref->local->debugfs.rcdir); |
4b7679a5 JB |
238 | ctrl_ref->local->debugfs.rcdir = NULL; |
239 | #endif | |
240 | ||
f0706e82 JB |
241 | kfree(ctrl_ref); |
242 | } | |
243 | ||
b6f35301 | 244 | static bool rc_no_data_or_no_ack_use_min(struct ieee80211_tx_rate_control *txrc) |
4c6d4f5c LR |
245 | { |
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 | ||
b6f35301 RM |
253 | return (info->flags & (IEEE80211_TX_CTL_NO_ACK | |
254 | IEEE80211_TX_CTL_USE_MINRATE)) || | |
255 | !ieee80211_is_data(fc); | |
4c6d4f5c LR |
256 | } |
257 | ||
06703079 | 258 | static void rc_send_low_basicrate(s8 *idx, u32 basic_rates, |
8f0729b1 | 259 | struct ieee80211_supported_band *sband) |
e00cfce0 JM |
260 | { |
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 | ||
8f0729b1 | 270 | for (i = *idx + 1; i <= sband->n_bitrates; i++) { |
e00cfce0 JM |
271 | 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 | ||
2103dec1 SW |
280 | static void __rate_control_send_low(struct ieee80211_hw *hw, |
281 | struct ieee80211_supported_band *sband, | |
282 | struct ieee80211_sta *sta, | |
1d2d350b AO |
283 | struct ieee80211_tx_info *info, |
284 | u32 rate_mask) | |
aad14ceb RM |
285 | { |
286 | int i; | |
2103dec1 SW |
287 | u32 rate_flags = |
288 | ieee80211_chandef_rate_flags(&hw->conf.chandef); | |
aad14ceb | 289 | |
2103dec1 SW |
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; | |
aad14ceb | 295 | for (i = 0; i < sband->n_bitrates; i++) { |
1d2d350b AO |
296 | if (!(rate_mask & BIT(i))) |
297 | continue; | |
298 | ||
1431fcb7 AO |
299 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) |
300 | continue; | |
301 | ||
2103dec1 | 302 | if (!rate_supported(sta, sband->band, i)) |
aad14ceb RM |
303 | continue; |
304 | ||
2103dec1 SW |
305 | info->control.rates[0].idx = i; |
306 | break; | |
aad14ceb | 307 | } |
2103dec1 | 308 | WARN_ON_ONCE(i == sband->n_bitrates); |
0d528d85 FF |
309 | |
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 | ||
aad14ceb | 317 | |
06703079 | 318 | bool rate_control_send_low(struct ieee80211_sta *pubsta, |
4c6d4f5c LR |
319 | void *priv_sta, |
320 | struct ieee80211_tx_rate_control *txrc) | |
321 | { | |
322 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); | |
dd5b4cc7 | 323 | struct ieee80211_supported_band *sband = txrc->sband; |
06703079 | 324 | struct sta_info *sta; |
dd5b4cc7 | 325 | int mcast_rate; |
06703079 | 326 | bool use_basicrate = false; |
4c6d4f5c | 327 | |
06703079 | 328 | if (!pubsta || !priv_sta || rc_no_data_or_no_ack_use_min(txrc)) { |
1d2d350b AO |
329 | __rate_control_send_low(txrc->hw, sband, pubsta, info, |
330 | txrc->rate_idx_mask); | |
0d528d85 | 331 | |
06703079 | 332 | if (!pubsta && txrc->bss) { |
dd5b4cc7 FF |
333 | 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 | } | |
06703079 CYY |
338 | 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 | } | |
dd5b4cc7 | 344 | |
06703079 CYY |
345 | if (use_basicrate) |
346 | rc_send_low_basicrate(&info->control.rates[0].idx, | |
e00cfce0 | 347 | txrc->bss_conf->basic_rates, |
dd5b4cc7 | 348 | sband); |
06703079 | 349 | |
4c6d4f5c LR |
350 | return true; |
351 | } | |
352 | return false; | |
353 | } | |
354 | EXPORT_SYMBOL(rate_control_send_low); | |
355 | ||
19468413 SW |
356 | static bool rate_idx_match_legacy_mask(struct ieee80211_tx_rate *rate, |
357 | int n_bitrates, u32 mask) | |
37eb0b16 JM |
358 | { |
359 | int j; | |
360 | ||
361 | /* See whether the selected rate or anything below it is allowed. */ | |
362 | for (j = rate->idx; j >= 0; j--) { | |
363 | if (mask & (1 << j)) { | |
364 | /* Okay, found a suitable rate. Use it. */ | |
365 | rate->idx = j; | |
19468413 | 366 | return true; |
37eb0b16 JM |
367 | } |
368 | } | |
369 | ||
370 | /* Try to find a higher rate that would be allowed */ | |
371 | for (j = rate->idx + 1; j < n_bitrates; j++) { | |
372 | if (mask & (1 << j)) { | |
373 | /* Okay, found a suitable rate. Use it. */ | |
374 | rate->idx = j; | |
19468413 SW |
375 | return true; |
376 | } | |
377 | } | |
378 | return false; | |
379 | } | |
380 | ||
381 | static bool rate_idx_match_mcs_mask(struct ieee80211_tx_rate *rate, | |
382 | u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN]) | |
383 | { | |
384 | int i, j; | |
385 | int ridx, rbit; | |
386 | ||
387 | ridx = rate->idx / 8; | |
388 | rbit = rate->idx % 8; | |
389 | ||
390 | /* sanity check */ | |
910570b5 | 391 | if (ridx < 0 || ridx >= IEEE80211_HT_MCS_MASK_LEN) |
19468413 SW |
392 | return false; |
393 | ||
394 | /* See whether the selected rate or anything below it is allowed. */ | |
395 | for (i = ridx; i >= 0; i--) { | |
396 | for (j = rbit; j >= 0; j--) | |
397 | if (mcs_mask[i] & BIT(j)) { | |
398 | rate->idx = i * 8 + j; | |
399 | return true; | |
400 | } | |
401 | rbit = 7; | |
402 | } | |
403 | ||
404 | /* Try to find a higher rate that would be allowed */ | |
405 | ridx = (rate->idx + 1) / 8; | |
406 | rbit = (rate->idx + 1) % 8; | |
407 | ||
408 | for (i = ridx; i < IEEE80211_HT_MCS_MASK_LEN; i++) { | |
409 | for (j = rbit; j < 8; j++) | |
410 | if (mcs_mask[i] & BIT(j)) { | |
411 | rate->idx = i * 8 + j; | |
412 | return true; | |
413 | } | |
414 | rbit = 0; | |
415 | } | |
416 | return false; | |
417 | } | |
418 | ||
419 | ||
420 | ||
421 | static void rate_idx_match_mask(struct ieee80211_tx_rate *rate, | |
0d528d85 FF |
422 | struct ieee80211_supported_band *sband, |
423 | enum nl80211_chan_width chan_width, | |
19468413 SW |
424 | u32 mask, |
425 | u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN]) | |
426 | { | |
427 | struct ieee80211_tx_rate alt_rate; | |
428 | ||
429 | /* handle HT rates */ | |
430 | if (rate->flags & IEEE80211_TX_RC_MCS) { | |
431 | if (rate_idx_match_mcs_mask(rate, mcs_mask)) | |
432 | return; | |
433 | ||
434 | /* also try the legacy rates. */ | |
435 | alt_rate.idx = 0; | |
436 | /* keep protection flags */ | |
437 | alt_rate.flags = rate->flags & | |
438 | (IEEE80211_TX_RC_USE_RTS_CTS | | |
439 | IEEE80211_TX_RC_USE_CTS_PROTECT | | |
440 | IEEE80211_TX_RC_USE_SHORT_PREAMBLE); | |
441 | alt_rate.count = rate->count; | |
442 | if (rate_idx_match_legacy_mask(&alt_rate, | |
0d528d85 | 443 | sband->n_bitrates, mask)) { |
19468413 SW |
444 | *rate = alt_rate; |
445 | return; | |
446 | } | |
628c010f | 447 | } else if (!(rate->flags & IEEE80211_TX_RC_VHT_MCS)) { |
19468413 | 448 | /* handle legacy rates */ |
0d528d85 | 449 | if (rate_idx_match_legacy_mask(rate, sband->n_bitrates, mask)) |
19468413 SW |
450 | return; |
451 | ||
452 | /* if HT BSS, and we handle a data frame, also try HT rates */ | |
0418a445 SW |
453 | switch (chan_width) { |
454 | case NL80211_CHAN_WIDTH_20_NOHT: | |
455 | case NL80211_CHAN_WIDTH_5: | |
456 | case NL80211_CHAN_WIDTH_10: | |
19468413 | 457 | return; |
0418a445 SW |
458 | default: |
459 | break; | |
460 | } | |
19468413 SW |
461 | |
462 | alt_rate.idx = 0; | |
463 | /* keep protection flags */ | |
464 | alt_rate.flags = rate->flags & | |
465 | (IEEE80211_TX_RC_USE_RTS_CTS | | |
466 | IEEE80211_TX_RC_USE_CTS_PROTECT | | |
467 | IEEE80211_TX_RC_USE_SHORT_PREAMBLE); | |
468 | alt_rate.count = rate->count; | |
469 | ||
470 | alt_rate.flags |= IEEE80211_TX_RC_MCS; | |
471 | ||
0d528d85 | 472 | if (chan_width == NL80211_CHAN_WIDTH_40) |
19468413 SW |
473 | alt_rate.flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; |
474 | ||
475 | if (rate_idx_match_mcs_mask(&alt_rate, mcs_mask)) { | |
476 | *rate = alt_rate; | |
37eb0b16 JM |
477 | return; |
478 | } | |
479 | } | |
480 | ||
481 | /* | |
482 | * Uh.. No suitable rate exists. This should not really happen with | |
483 | * sane TX rate mask configurations. However, should someone manage to | |
484 | * configure supported rates and TX rate mask in incompatible way, | |
485 | * allow the frame to be transmitted with whatever the rate control | |
486 | * selected. | |
487 | */ | |
488 | } | |
489 | ||
0d528d85 FF |
490 | static void rate_fixup_ratelist(struct ieee80211_vif *vif, |
491 | struct ieee80211_supported_band *sband, | |
492 | struct ieee80211_tx_info *info, | |
493 | struct ieee80211_tx_rate *rates, | |
494 | int max_rates) | |
495 | { | |
496 | struct ieee80211_rate *rate; | |
497 | bool inval = false; | |
498 | int i; | |
499 | ||
500 | /* | |
501 | * Set up the RTS/CTS rate as the fastest basic rate | |
502 | * that is not faster than the data rate unless there | |
503 | * is no basic rate slower than the data rate, in which | |
504 | * case we pick the slowest basic rate | |
505 | * | |
506 | * XXX: Should this check all retry rates? | |
507 | */ | |
336004e2 FF |
508 | if (!(rates[0].flags & |
509 | (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))) { | |
0d528d85 | 510 | u32 basic_rates = vif->bss_conf.basic_rates; |
c7abf25a | 511 | s8 baserate = basic_rates ? ffs(basic_rates) - 1 : 0; |
0d528d85 FF |
512 | |
513 | rate = &sband->bitrates[rates[0].idx]; | |
514 | ||
515 | for (i = 0; i < sband->n_bitrates; i++) { | |
516 | /* must be a basic rate */ | |
517 | if (!(basic_rates & BIT(i))) | |
518 | continue; | |
519 | /* must not be faster than the data rate */ | |
520 | if (sband->bitrates[i].bitrate > rate->bitrate) | |
521 | continue; | |
522 | /* maximum */ | |
523 | if (sband->bitrates[baserate].bitrate < | |
524 | sband->bitrates[i].bitrate) | |
525 | baserate = i; | |
526 | } | |
527 | ||
528 | info->control.rts_cts_rate_idx = baserate; | |
529 | } | |
530 | ||
531 | for (i = 0; i < max_rates; i++) { | |
532 | /* | |
533 | * make sure there's no valid rate following | |
534 | * an invalid one, just in case drivers don't | |
535 | * take the API seriously to stop at -1. | |
536 | */ | |
537 | if (inval) { | |
538 | rates[i].idx = -1; | |
539 | continue; | |
540 | } | |
541 | if (rates[i].idx < 0) { | |
542 | inval = true; | |
543 | continue; | |
544 | } | |
545 | ||
546 | /* | |
547 | * For now assume MCS is already set up correctly, this | |
548 | * needs to be fixed. | |
549 | */ | |
550 | if (rates[i].flags & IEEE80211_TX_RC_MCS) { | |
551 | WARN_ON(rates[i].idx > 76); | |
552 | ||
553 | if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) && | |
554 | info->control.use_cts_prot) | |
555 | rates[i].flags |= | |
556 | IEEE80211_TX_RC_USE_CTS_PROTECT; | |
557 | continue; | |
558 | } | |
559 | ||
560 | if (rates[i].flags & IEEE80211_TX_RC_VHT_MCS) { | |
561 | WARN_ON(ieee80211_rate_get_vht_mcs(&rates[i]) > 9); | |
562 | continue; | |
563 | } | |
564 | ||
565 | /* set up RTS protection if desired */ | |
566 | if (info->control.use_rts) { | |
567 | rates[i].flags |= IEEE80211_TX_RC_USE_RTS_CTS; | |
568 | info->control.use_cts_prot = false; | |
569 | } | |
570 | ||
571 | /* RC is busted */ | |
572 | if (WARN_ON_ONCE(rates[i].idx >= sband->n_bitrates)) { | |
573 | rates[i].idx = -1; | |
574 | continue; | |
575 | } | |
576 | ||
577 | rate = &sband->bitrates[rates[i].idx]; | |
578 | ||
579 | /* set up short preamble */ | |
580 | if (info->control.short_preamble && | |
581 | rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) | |
582 | rates[i].flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE; | |
583 | ||
584 | /* set up G protection */ | |
585 | if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) && | |
586 | info->control.use_cts_prot && | |
587 | rate->flags & IEEE80211_RATE_ERP_G) | |
588 | rates[i].flags |= IEEE80211_TX_RC_USE_CTS_PROTECT; | |
589 | } | |
590 | } | |
591 | ||
592 | ||
593 | static void rate_control_fill_sta_table(struct ieee80211_sta *sta, | |
594 | struct ieee80211_tx_info *info, | |
595 | struct ieee80211_tx_rate *rates, | |
596 | int max_rates) | |
597 | { | |
598 | struct ieee80211_sta_rates *ratetbl = NULL; | |
599 | int i; | |
600 | ||
601 | if (sta && !info->control.skip_table) | |
602 | ratetbl = rcu_dereference(sta->rates); | |
603 | ||
604 | /* Fill remaining rate slots with data from the sta rate table. */ | |
605 | max_rates = min_t(int, max_rates, IEEE80211_TX_RATE_TABLE_SIZE); | |
606 | for (i = 0; i < max_rates; i++) { | |
607 | if (i < ARRAY_SIZE(info->control.rates) && | |
608 | info->control.rates[i].idx >= 0 && | |
609 | info->control.rates[i].count) { | |
610 | if (rates != info->control.rates) | |
611 | rates[i] = info->control.rates[i]; | |
612 | } else if (ratetbl) { | |
613 | rates[i].idx = ratetbl->rate[i].idx; | |
614 | rates[i].flags = ratetbl->rate[i].flags; | |
615 | if (info->control.use_rts) | |
616 | rates[i].count = ratetbl->rate[i].count_rts; | |
617 | else if (info->control.use_cts_prot) | |
618 | rates[i].count = ratetbl->rate[i].count_cts; | |
619 | else | |
620 | rates[i].count = ratetbl->rate[i].count; | |
621 | } else { | |
622 | rates[i].idx = -1; | |
623 | rates[i].count = 0; | |
624 | } | |
625 | ||
626 | if (rates[i].idx < 0 || !rates[i].count) | |
627 | break; | |
628 | } | |
629 | } | |
630 | ||
631 | static void rate_control_apply_mask(struct ieee80211_sub_if_data *sdata, | |
632 | struct ieee80211_sta *sta, | |
633 | struct ieee80211_supported_band *sband, | |
634 | struct ieee80211_tx_info *info, | |
635 | struct ieee80211_tx_rate *rates, | |
636 | int max_rates) | |
637 | { | |
638 | enum nl80211_chan_width chan_width; | |
639 | u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN]; | |
640 | bool has_mcs_mask; | |
641 | u32 mask; | |
2103dec1 | 642 | u32 rate_flags; |
0d528d85 FF |
643 | int i; |
644 | ||
645 | /* | |
646 | * Try to enforce the rateidx mask the user wanted. skip this if the | |
647 | * default mask (allow all rates) is used to save some processing for | |
648 | * the common case. | |
649 | */ | |
650 | mask = sdata->rc_rateidx_mask[info->band]; | |
651 | has_mcs_mask = sdata->rc_has_mcs_mask[info->band]; | |
2103dec1 SW |
652 | rate_flags = |
653 | ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef); | |
654 | for (i = 0; i < sband->n_bitrates; i++) | |
655 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) | |
656 | mask &= ~BIT(i); | |
657 | ||
0d528d85 FF |
658 | if (mask == (1 << sband->n_bitrates) - 1 && !has_mcs_mask) |
659 | return; | |
660 | ||
661 | if (has_mcs_mask) | |
662 | memcpy(mcs_mask, sdata->rc_rateidx_mcs_mask[info->band], | |
663 | sizeof(mcs_mask)); | |
664 | else | |
665 | memset(mcs_mask, 0xff, sizeof(mcs_mask)); | |
666 | ||
667 | if (sta) { | |
668 | /* Filter out rates that the STA does not support */ | |
669 | mask &= sta->supp_rates[info->band]; | |
670 | for (i = 0; i < sizeof(mcs_mask); i++) | |
671 | mcs_mask[i] &= sta->ht_cap.mcs.rx_mask[i]; | |
672 | } | |
673 | ||
674 | /* | |
675 | * Make sure the rate index selected for each TX rate is | |
676 | * included in the configured mask and change the rate indexes | |
677 | * if needed. | |
678 | */ | |
679 | chan_width = sdata->vif.bss_conf.chandef.width; | |
680 | for (i = 0; i < max_rates; i++) { | |
681 | /* Skip invalid rates */ | |
682 | if (rates[i].idx < 0) | |
683 | break; | |
684 | ||
795d855d | 685 | rate_idx_match_mask(&rates[i], sband, chan_width, mask, |
0d528d85 FF |
686 | mcs_mask); |
687 | } | |
688 | } | |
689 | ||
690 | void ieee80211_get_tx_rates(struct ieee80211_vif *vif, | |
691 | struct ieee80211_sta *sta, | |
692 | struct sk_buff *skb, | |
693 | struct ieee80211_tx_rate *dest, | |
694 | int max_rates) | |
695 | { | |
696 | struct ieee80211_sub_if_data *sdata; | |
697 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
698 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
699 | struct ieee80211_supported_band *sband; | |
700 | ||
701 | rate_control_fill_sta_table(sta, info, dest, max_rates); | |
702 | ||
703 | if (!vif) | |
704 | return; | |
705 | ||
706 | sdata = vif_to_sdata(vif); | |
707 | sband = sdata->local->hw.wiphy->bands[info->band]; | |
708 | ||
709 | if (ieee80211_is_data(hdr->frame_control)) | |
710 | rate_control_apply_mask(sdata, sta, sband, info, dest, max_rates); | |
711 | ||
712 | if (dest[0].idx < 0) | |
1d2d350b AO |
713 | __rate_control_send_low(&sdata->local->hw, sband, sta, info, |
714 | sdata->rc_rateidx_mask[info->band]); | |
0d528d85 FF |
715 | |
716 | if (sta) | |
717 | rate_fixup_ratelist(vif, sband, info, dest, max_rates); | |
718 | } | |
719 | EXPORT_SYMBOL(ieee80211_get_tx_rates); | |
720 | ||
4b7679a5 | 721 | void rate_control_get_rate(struct ieee80211_sub_if_data *sdata, |
e6a9854b JB |
722 | struct sta_info *sta, |
723 | struct ieee80211_tx_rate_control *txrc) | |
1abbe498 | 724 | { |
4b7679a5 JB |
725 | struct rate_control_ref *ref = sdata->local->rate_ctrl; |
726 | void *priv_sta = NULL; | |
727 | struct ieee80211_sta *ista = NULL; | |
e6a9854b | 728 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); |
1abbe498 | 729 | int i; |
1abbe498 | 730 | |
e1936e94 | 731 | if (sta && test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) { |
4b7679a5 JB |
732 | ista = &sta->sta; |
733 | priv_sta = sta->rate_ctrl_priv; | |
734 | } | |
735 | ||
e6a9854b JB |
736 | for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { |
737 | info->control.rates[i].idx = -1; | |
738 | info->control.rates[i].flags = 0; | |
8617b093 | 739 | info->control.rates[i].count = 0; |
e6a9854b JB |
740 | } |
741 | ||
30686bf7 | 742 | if (ieee80211_hw_check(&sdata->local->hw, HAS_RATE_CONTROL)) |
5affcd6b JO |
743 | return; |
744 | ||
35c347ac JB |
745 | if (ista) { |
746 | spin_lock_bh(&sta->rate_ctrl_lock); | |
747 | ref->ops->get_rate(ref->priv, ista, priv_sta, txrc); | |
748 | spin_unlock_bh(&sta->rate_ctrl_lock); | |
749 | } else { | |
750 | ref->ops->get_rate(ref->priv, NULL, NULL, txrc); | |
751 | } | |
e6a9854b | 752 | |
30686bf7 | 753 | if (ieee80211_hw_check(&sdata->local->hw, SUPPORTS_RC_TABLE)) |
0d528d85 FF |
754 | return; |
755 | ||
756 | ieee80211_get_tx_rates(&sdata->vif, ista, txrc->skb, | |
757 | info->control.rates, | |
758 | ARRAY_SIZE(info->control.rates)); | |
759 | } | |
e6a9854b | 760 | |
0d528d85 FF |
761 | int rate_control_set_rates(struct ieee80211_hw *hw, |
762 | struct ieee80211_sta *pubsta, | |
763 | struct ieee80211_sta_rates *rates) | |
764 | { | |
f815e2b3 | 765 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
f6b3d85f | 766 | struct ieee80211_sta_rates *old; |
0d528d85 | 767 | |
f6b3d85f FF |
768 | /* |
769 | * mac80211 guarantees that this function will not be called | |
770 | * concurrently, so the following RCU access is safe, even without | |
771 | * extra locking. This can not be checked easily, so we just set | |
772 | * the condition to true. | |
773 | */ | |
774 | old = rcu_dereference_protected(pubsta->rates, true); | |
0d528d85 FF |
775 | rcu_assign_pointer(pubsta->rates, rates); |
776 | if (old) | |
777 | kfree_rcu(old, rcu_head); | |
778 | ||
f815e2b3 JB |
779 | drv_sta_rate_tbl_update(hw_to_local(hw), sta->sdata, pubsta); |
780 | ||
0d528d85 | 781 | return 0; |
1abbe498 | 782 | } |
0d528d85 | 783 | EXPORT_SYMBOL(rate_control_set_rates); |
1abbe498 | 784 | |
ff688089 JB |
785 | int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local, |
786 | const char *name) | |
787 | { | |
889cbb91 | 788 | struct rate_control_ref *ref; |
ff688089 JB |
789 | |
790 | ASSERT_RTNL(); | |
af65cd96 | 791 | |
3b8d81e0 | 792 | if (local->open_count) |
ff688089 JB |
793 | return -EBUSY; |
794 | ||
30686bf7 | 795 | if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { |
af65cd96 JB |
796 | if (WARN_ON(!local->ops->set_rts_threshold)) |
797 | return -EINVAL; | |
798 | return 0; | |
799 | } | |
800 | ||
ff688089 JB |
801 | ref = rate_control_alloc(name, local); |
802 | if (!ref) { | |
0fb9a9ec JP |
803 | wiphy_warn(local->hw.wiphy, |
804 | "Failed to select rate control algorithm\n"); | |
ff688089 JB |
805 | return -ENOENT; |
806 | } | |
807 | ||
889cbb91 | 808 | WARN_ON(local->rate_ctrl); |
ff688089 | 809 | local->rate_ctrl = ref; |
ff688089 | 810 | |
0fb9a9ec JP |
811 | wiphy_debug(local->hw.wiphy, "Selected rate control algorithm '%s'\n", |
812 | ref->ops->name); | |
ff688089 | 813 | |
ff688089 JB |
814 | return 0; |
815 | } | |
816 | ||
817 | void rate_control_deinitialize(struct ieee80211_local *local) | |
818 | { | |
819 | struct rate_control_ref *ref; | |
820 | ||
821 | ref = local->rate_ctrl; | |
af65cd96 JB |
822 | |
823 | if (!ref) | |
824 | return; | |
825 | ||
ff688089 | 826 | local->rate_ctrl = NULL; |
889cbb91 | 827 | rate_control_free(ref); |
ff688089 | 828 | } |
c21b39ac | 829 |