1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright 2002-2005, Instant802 Networks, Inc. |
4 | * Copyright 2005-2006, Devicescape Software, Inc. |
5 | * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz> |
6 | * Copyright 2017 Intel Deutschland GmbH |
7 | * Copyright (C) 2019, 2022-2024 Intel Corporation |
8 | */ |
9 | |
10 | #include <linux/kernel.h> |
11 | #include <linux/rtnetlink.h> |
12 | #include <linux/module.h> |
13 | #include <linux/slab.h> |
14 | #include "rate.h" |
15 | #include "ieee80211_i.h" |
16 | #include "debugfs.h" |
17 | |
18 | struct rate_control_alg { |
19 | struct list_head list; |
20 | const struct rate_control_ops *ops; |
21 | }; |
22 | |
23 | static LIST_HEAD(rate_ctrl_algs); |
24 | static DEFINE_MUTEX(rate_ctrl_mutex); |
25 | |
26 | static char *ieee80211_default_rc_algo = CONFIG_MAC80211_RC_DEFAULT; |
27 | module_param(ieee80211_default_rc_algo, charp, 0644); |
28 | MODULE_PARM_DESC(ieee80211_default_rc_algo, |
29 | "Default rate control algorithm for mac80211 to use" ); |
30 | |
31 | void rate_control_rate_init(struct sta_info *sta) |
32 | { |
33 | struct ieee80211_local *local = sta->sdata->local; |
34 | struct rate_control_ref *ref = sta->rate_ctrl; |
35 | struct ieee80211_sta *ista = &sta->sta; |
36 | void *priv_sta = sta->rate_ctrl_priv; |
37 | struct ieee80211_supported_band *sband; |
38 | struct ieee80211_chanctx_conf *chanctx_conf; |
39 | |
40 | ieee80211_sta_init_nss(link_sta: &sta->deflink); |
41 | |
42 | if (!ref) |
43 | return; |
44 | |
45 | rcu_read_lock(); |
46 | |
47 | chanctx_conf = rcu_dereference(sta->sdata->vif.bss_conf.chanctx_conf); |
48 | if (WARN_ON(!chanctx_conf)) { |
49 | rcu_read_unlock(); |
50 | return; |
51 | } |
52 | |
53 | sband = local->hw.wiphy->bands[chanctx_conf->def.chan->band]; |
54 | |
55 | /* TODO: check for minstrel_s1g ? */ |
56 | if (sband->band == NL80211_BAND_S1GHZ) { |
57 | ieee80211_s1g_sta_rate_init(sta); |
58 | rcu_read_unlock(); |
59 | return; |
60 | } |
61 | |
62 | spin_lock_bh(lock: &sta->rate_ctrl_lock); |
63 | ref->ops->rate_init(ref->priv, sband, &chanctx_conf->def, ista, |
64 | priv_sta); |
65 | spin_unlock_bh(lock: &sta->rate_ctrl_lock); |
66 | rcu_read_unlock(); |
67 | set_sta_flag(sta, flag: WLAN_STA_RATE_CONTROL); |
68 | } |
69 | |
70 | void rate_control_tx_status(struct ieee80211_local *local, |
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 | struct ieee80211_supported_band *sband; |
77 | |
78 | if (!ref || !test_sta_flag(sta, flag: WLAN_STA_RATE_CONTROL)) |
79 | return; |
80 | |
81 | sband = local->hw.wiphy->bands[st->info->band]; |
82 | |
83 | spin_lock_bh(lock: &sta->rate_ctrl_lock); |
84 | if (ref->ops->tx_status_ext) |
85 | ref->ops->tx_status_ext(ref->priv, sband, priv_sta, st); |
86 | else if (st->skb) |
87 | ref->ops->tx_status(ref->priv, sband, st->sta, priv_sta, st->skb); |
88 | else |
89 | WARN_ON_ONCE(1); |
90 | |
91 | spin_unlock_bh(lock: &sta->rate_ctrl_lock); |
92 | } |
93 | |
94 | void rate_control_rate_update(struct ieee80211_local *local, |
95 | struct ieee80211_supported_band *sband, |
96 | struct sta_info *sta, unsigned int link_id, |
97 | u32 changed) |
98 | { |
99 | struct rate_control_ref *ref = local->rate_ctrl; |
100 | struct ieee80211_sta *ista = &sta->sta; |
101 | void *priv_sta = sta->rate_ctrl_priv; |
102 | struct ieee80211_chanctx_conf *chanctx_conf; |
103 | |
104 | WARN_ON(link_id != 0); |
105 | |
106 | if (ref && ref->ops->rate_update) { |
107 | rcu_read_lock(); |
108 | |
109 | chanctx_conf = rcu_dereference(sta->sdata->vif.bss_conf.chanctx_conf); |
110 | if (WARN_ON(!chanctx_conf)) { |
111 | rcu_read_unlock(); |
112 | return; |
113 | } |
114 | |
115 | spin_lock_bh(lock: &sta->rate_ctrl_lock); |
116 | ref->ops->rate_update(ref->priv, sband, &chanctx_conf->def, |
117 | ista, priv_sta, changed); |
118 | spin_unlock_bh(lock: &sta->rate_ctrl_lock); |
119 | rcu_read_unlock(); |
120 | } |
121 | |
122 | if (sta->uploaded) |
123 | drv_sta_rc_update(local, sdata: sta->sdata, sta: &sta->sta, changed); |
124 | } |
125 | |
126 | int ieee80211_rate_control_register(const struct rate_control_ops *ops) |
127 | { |
128 | struct rate_control_alg *alg; |
129 | |
130 | if (!ops->name) |
131 | return -EINVAL; |
132 | |
133 | mutex_lock(&rate_ctrl_mutex); |
134 | list_for_each_entry(alg, &rate_ctrl_algs, list) { |
135 | if (!strcmp(alg->ops->name, ops->name)) { |
136 | /* don't register an algorithm twice */ |
137 | WARN_ON(1); |
138 | mutex_unlock(lock: &rate_ctrl_mutex); |
139 | return -EALREADY; |
140 | } |
141 | } |
142 | |
143 | alg = kzalloc(size: sizeof(*alg), GFP_KERNEL); |
144 | if (alg == NULL) { |
145 | mutex_unlock(lock: &rate_ctrl_mutex); |
146 | return -ENOMEM; |
147 | } |
148 | alg->ops = ops; |
149 | |
150 | list_add_tail(new: &alg->list, head: &rate_ctrl_algs); |
151 | mutex_unlock(lock: &rate_ctrl_mutex); |
152 | |
153 | return 0; |
154 | } |
155 | EXPORT_SYMBOL(ieee80211_rate_control_register); |
156 | |
157 | void ieee80211_rate_control_unregister(const struct rate_control_ops *ops) |
158 | { |
159 | struct rate_control_alg *alg; |
160 | |
161 | mutex_lock(&rate_ctrl_mutex); |
162 | list_for_each_entry(alg, &rate_ctrl_algs, list) { |
163 | if (alg->ops == ops) { |
164 | list_del(entry: &alg->list); |
165 | kfree(objp: alg); |
166 | break; |
167 | } |
168 | } |
169 | mutex_unlock(lock: &rate_ctrl_mutex); |
170 | } |
171 | EXPORT_SYMBOL(ieee80211_rate_control_unregister); |
172 | |
173 | static const struct rate_control_ops * |
174 | ieee80211_try_rate_control_ops_get(const char *name) |
175 | { |
176 | struct rate_control_alg *alg; |
177 | const struct rate_control_ops *ops = NULL; |
178 | |
179 | if (!name) |
180 | return NULL; |
181 | |
182 | mutex_lock(&rate_ctrl_mutex); |
183 | list_for_each_entry(alg, &rate_ctrl_algs, list) { |
184 | if (!strcmp(alg->ops->name, name)) { |
185 | ops = alg->ops; |
186 | break; |
187 | } |
188 | } |
189 | mutex_unlock(lock: &rate_ctrl_mutex); |
190 | return ops; |
191 | } |
192 | |
193 | /* Get the rate control algorithm. */ |
194 | static const struct rate_control_ops * |
195 | ieee80211_rate_control_ops_get(const char *name) |
196 | { |
197 | const struct rate_control_ops *ops; |
198 | const char *alg_name; |
199 | |
200 | kernel_param_lock(THIS_MODULE); |
201 | if (!name) |
202 | alg_name = ieee80211_default_rc_algo; |
203 | else |
204 | alg_name = name; |
205 | |
206 | ops = ieee80211_try_rate_control_ops_get(name: alg_name); |
207 | if (!ops && name) |
208 | /* try default if specific alg requested but not found */ |
209 | ops = ieee80211_try_rate_control_ops_get(name: ieee80211_default_rc_algo); |
210 | |
211 | /* Note: check for > 0 is intentional to avoid clang warning */ |
212 | if (!ops && (strlen(CONFIG_MAC80211_RC_DEFAULT) > 0)) |
213 | /* try built-in one if specific alg requested but not found */ |
214 | ops = ieee80211_try_rate_control_ops_get(CONFIG_MAC80211_RC_DEFAULT); |
215 | |
216 | kernel_param_unlock(THIS_MODULE); |
217 | |
218 | return ops; |
219 | } |
220 | |
221 | #ifdef CONFIG_MAC80211_DEBUGFS |
222 | static ssize_t rcname_read(struct file *file, char __user *userbuf, |
223 | size_t count, loff_t *ppos) |
224 | { |
225 | struct rate_control_ref *ref = file->private_data; |
226 | int len = strlen(ref->ops->name); |
227 | |
228 | return simple_read_from_buffer(to: userbuf, count, ppos, |
229 | from: ref->ops->name, available: len); |
230 | } |
231 | |
232 | const struct file_operations rcname_ops = { |
233 | .read = rcname_read, |
234 | .open = simple_open, |
235 | .llseek = default_llseek, |
236 | }; |
237 | #endif |
238 | |
239 | static struct rate_control_ref * |
240 | rate_control_alloc(const char *name, struct ieee80211_local *local) |
241 | { |
242 | struct rate_control_ref *ref; |
243 | |
244 | ref = kmalloc(size: sizeof(struct rate_control_ref), GFP_KERNEL); |
245 | if (!ref) |
246 | return NULL; |
247 | ref->ops = ieee80211_rate_control_ops_get(name); |
248 | if (!ref->ops) |
249 | goto free; |
250 | |
251 | ref->priv = ref->ops->alloc(&local->hw); |
252 | if (!ref->priv) |
253 | goto free; |
254 | return ref; |
255 | |
256 | free: |
257 | kfree(objp: ref); |
258 | return NULL; |
259 | } |
260 | |
261 | static void rate_control_free(struct ieee80211_local *local, |
262 | struct rate_control_ref *ctrl_ref) |
263 | { |
264 | ctrl_ref->ops->free(ctrl_ref->priv); |
265 | |
266 | #ifdef CONFIG_MAC80211_DEBUGFS |
267 | debugfs_remove_recursive(dentry: local->debugfs.rcdir); |
268 | local->debugfs.rcdir = NULL; |
269 | #endif |
270 | |
271 | kfree(objp: ctrl_ref); |
272 | } |
273 | |
274 | void ieee80211_check_rate_mask(struct ieee80211_link_data *link) |
275 | { |
276 | struct ieee80211_sub_if_data *sdata = link->sdata; |
277 | struct ieee80211_local *local = sdata->local; |
278 | struct ieee80211_supported_band *sband; |
279 | u32 user_mask, basic_rates = link->conf->basic_rates; |
280 | enum nl80211_band band; |
281 | |
282 | if (WARN_ON(!link->conf->chanreq.oper.chan)) |
283 | return; |
284 | |
285 | band = link->conf->chanreq.oper.chan->band; |
286 | if (band == NL80211_BAND_S1GHZ) { |
287 | /* TODO */ |
288 | return; |
289 | } |
290 | |
291 | if (WARN_ON_ONCE(!basic_rates)) |
292 | return; |
293 | |
294 | user_mask = sdata->rc_rateidx_mask[band]; |
295 | sband = local->hw.wiphy->bands[band]; |
296 | |
297 | if (user_mask & basic_rates) |
298 | return; |
299 | |
300 | sdata_dbg(sdata, |
301 | "no overlap between basic rates (0x%x) and user mask (0x%x on band %d) - clearing the latter" , |
302 | basic_rates, user_mask, band); |
303 | sdata->rc_rateidx_mask[band] = (1 << sband->n_bitrates) - 1; |
304 | } |
305 | |
306 | static bool rc_no_data_or_no_ack_use_min(struct ieee80211_tx_rate_control *txrc) |
307 | { |
308 | struct sk_buff *skb = txrc->skb; |
309 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
310 | |
311 | return (info->flags & (IEEE80211_TX_CTL_NO_ACK | |
312 | IEEE80211_TX_CTL_USE_MINRATE)) || |
313 | !ieee80211_is_tx_data(skb); |
314 | } |
315 | |
316 | static void rc_send_low_basicrate(struct ieee80211_tx_rate *rate, |
317 | u32 basic_rates, |
318 | struct ieee80211_supported_band *sband) |
319 | { |
320 | u8 i; |
321 | |
322 | if (sband->band == NL80211_BAND_S1GHZ) { |
323 | /* TODO */ |
324 | rate->flags |= IEEE80211_TX_RC_S1G_MCS; |
325 | rate->idx = 0; |
326 | return; |
327 | } |
328 | |
329 | if (basic_rates == 0) |
330 | return; /* assume basic rates unknown and accept rate */ |
331 | if (rate->idx < 0) |
332 | return; |
333 | if (basic_rates & (1 << rate->idx)) |
334 | return; /* selected rate is a basic rate */ |
335 | |
336 | for (i = rate->idx + 1; i <= sband->n_bitrates; i++) { |
337 | if (basic_rates & (1 << i)) { |
338 | rate->idx = i; |
339 | return; |
340 | } |
341 | } |
342 | |
343 | /* could not find a basic rate; use original selection */ |
344 | } |
345 | |
346 | static void __rate_control_send_low(struct ieee80211_hw *hw, |
347 | struct ieee80211_supported_band *sband, |
348 | struct ieee80211_sta *sta, |
349 | struct ieee80211_tx_info *info, |
350 | u32 rate_mask) |
351 | { |
352 | int i; |
353 | u32 rate_flags = |
354 | ieee80211_chandef_rate_flags(chandef: &hw->conf.chandef); |
355 | |
356 | if (sband->band == NL80211_BAND_S1GHZ) { |
357 | info->control.rates[0].flags |= IEEE80211_TX_RC_S1G_MCS; |
358 | info->control.rates[0].idx = 0; |
359 | return; |
360 | } |
361 | |
362 | if ((sband->band == NL80211_BAND_2GHZ) && |
363 | (info->flags & IEEE80211_TX_CTL_NO_CCK_RATE)) |
364 | rate_flags |= IEEE80211_RATE_ERP_G; |
365 | |
366 | info->control.rates[0].idx = 0; |
367 | for (i = 0; i < sband->n_bitrates; i++) { |
368 | if (!(rate_mask & BIT(i))) |
369 | continue; |
370 | |
371 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) |
372 | continue; |
373 | |
374 | if (!rate_supported(sta, band: sband->band, index: i)) |
375 | continue; |
376 | |
377 | info->control.rates[0].idx = i; |
378 | break; |
379 | } |
380 | WARN_ONCE(i == sband->n_bitrates, |
381 | "no supported rates for sta %pM (0x%x, band %d) in rate_mask 0x%x with flags 0x%x\n" , |
382 | sta ? sta->addr : NULL, |
383 | sta ? sta->deflink.supp_rates[sband->band] : -1, |
384 | sband->band, |
385 | rate_mask, rate_flags); |
386 | |
387 | info->control.rates[0].count = |
388 | (info->flags & IEEE80211_TX_CTL_NO_ACK) ? |
389 | 1 : hw->max_rate_tries; |
390 | |
391 | info->control.skip_table = 1; |
392 | } |
393 | |
394 | |
395 | static bool rate_control_send_low(struct ieee80211_sta *pubsta, |
396 | struct ieee80211_tx_rate_control *txrc) |
397 | { |
398 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb: txrc->skb); |
399 | struct ieee80211_supported_band *sband = txrc->sband; |
400 | struct sta_info *sta; |
401 | int mcast_rate; |
402 | bool use_basicrate = false; |
403 | |
404 | if (!pubsta || rc_no_data_or_no_ack_use_min(txrc)) { |
405 | __rate_control_send_low(hw: txrc->hw, sband, sta: pubsta, info, |
406 | rate_mask: txrc->rate_idx_mask); |
407 | |
408 | if (!pubsta && txrc->bss) { |
409 | mcast_rate = txrc->bss_conf->mcast_rate[sband->band]; |
410 | if (mcast_rate > 0) { |
411 | info->control.rates[0].idx = mcast_rate - 1; |
412 | return true; |
413 | } |
414 | use_basicrate = true; |
415 | } else if (pubsta) { |
416 | sta = container_of(pubsta, struct sta_info, sta); |
417 | if (ieee80211_vif_is_mesh(vif: &sta->sdata->vif)) |
418 | use_basicrate = true; |
419 | } |
420 | |
421 | if (use_basicrate) |
422 | rc_send_low_basicrate(rate: &info->control.rates[0], |
423 | basic_rates: txrc->bss_conf->basic_rates, |
424 | sband); |
425 | |
426 | return true; |
427 | } |
428 | return false; |
429 | } |
430 | |
431 | static bool rate_idx_match_legacy_mask(s8 *rate_idx, int n_bitrates, u32 mask) |
432 | { |
433 | int j; |
434 | |
435 | /* See whether the selected rate or anything below it is allowed. */ |
436 | for (j = *rate_idx; j >= 0; j--) { |
437 | if (mask & (1 << j)) { |
438 | /* Okay, found a suitable rate. Use it. */ |
439 | *rate_idx = j; |
440 | return true; |
441 | } |
442 | } |
443 | |
444 | /* Try to find a higher rate that would be allowed */ |
445 | for (j = *rate_idx + 1; j < n_bitrates; j++) { |
446 | if (mask & (1 << j)) { |
447 | /* Okay, found a suitable rate. Use it. */ |
448 | *rate_idx = j; |
449 | return true; |
450 | } |
451 | } |
452 | return false; |
453 | } |
454 | |
455 | static bool rate_idx_match_mcs_mask(s8 *rate_idx, u8 *mcs_mask) |
456 | { |
457 | int i, j; |
458 | int ridx, rbit; |
459 | |
460 | ridx = *rate_idx / 8; |
461 | rbit = *rate_idx % 8; |
462 | |
463 | /* sanity check */ |
464 | if (ridx < 0 || ridx >= IEEE80211_HT_MCS_MASK_LEN) |
465 | return false; |
466 | |
467 | /* See whether the selected rate or anything below it is allowed. */ |
468 | for (i = ridx; i >= 0; i--) { |
469 | for (j = rbit; j >= 0; j--) |
470 | if (mcs_mask[i] & BIT(j)) { |
471 | *rate_idx = i * 8 + j; |
472 | return true; |
473 | } |
474 | rbit = 7; |
475 | } |
476 | |
477 | /* Try to find a higher rate that would be allowed */ |
478 | ridx = (*rate_idx + 1) / 8; |
479 | rbit = (*rate_idx + 1) % 8; |
480 | |
481 | for (i = ridx; i < IEEE80211_HT_MCS_MASK_LEN; i++) { |
482 | for (j = rbit; j < 8; j++) |
483 | if (mcs_mask[i] & BIT(j)) { |
484 | *rate_idx = i * 8 + j; |
485 | return true; |
486 | } |
487 | rbit = 0; |
488 | } |
489 | return false; |
490 | } |
491 | |
492 | static bool rate_idx_match_vht_mcs_mask(s8 *rate_idx, u16 *vht_mask) |
493 | { |
494 | int i, j; |
495 | int ridx, rbit; |
496 | |
497 | ridx = *rate_idx >> 4; |
498 | rbit = *rate_idx & 0xf; |
499 | |
500 | if (ridx < 0 || ridx >= NL80211_VHT_NSS_MAX) |
501 | return false; |
502 | |
503 | /* See whether the selected rate or anything below it is allowed. */ |
504 | for (i = ridx; i >= 0; i--) { |
505 | for (j = rbit; j >= 0; j--) { |
506 | if (vht_mask[i] & BIT(j)) { |
507 | *rate_idx = (i << 4) | j; |
508 | return true; |
509 | } |
510 | } |
511 | rbit = 15; |
512 | } |
513 | |
514 | /* Try to find a higher rate that would be allowed */ |
515 | ridx = (*rate_idx + 1) >> 4; |
516 | rbit = (*rate_idx + 1) & 0xf; |
517 | |
518 | for (i = ridx; i < NL80211_VHT_NSS_MAX; i++) { |
519 | for (j = rbit; j < 16; j++) { |
520 | if (vht_mask[i] & BIT(j)) { |
521 | *rate_idx = (i << 4) | j; |
522 | return true; |
523 | } |
524 | } |
525 | rbit = 0; |
526 | } |
527 | return false; |
528 | } |
529 | |
530 | static void rate_idx_match_mask(s8 *rate_idx, u16 *rate_flags, |
531 | struct ieee80211_supported_band *sband, |
532 | enum nl80211_chan_width chan_width, |
533 | u32 mask, |
534 | u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN], |
535 | u16 vht_mask[NL80211_VHT_NSS_MAX]) |
536 | { |
537 | if (*rate_flags & IEEE80211_TX_RC_VHT_MCS) { |
538 | /* handle VHT rates */ |
539 | if (rate_idx_match_vht_mcs_mask(rate_idx, vht_mask)) |
540 | return; |
541 | |
542 | *rate_idx = 0; |
543 | /* keep protection flags */ |
544 | *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS | |
545 | IEEE80211_TX_RC_USE_CTS_PROTECT | |
546 | IEEE80211_TX_RC_USE_SHORT_PREAMBLE); |
547 | |
548 | *rate_flags |= IEEE80211_TX_RC_MCS; |
549 | if (chan_width == NL80211_CHAN_WIDTH_40) |
550 | *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; |
551 | |
552 | if (rate_idx_match_mcs_mask(rate_idx, mcs_mask)) |
553 | return; |
554 | |
555 | /* also try the legacy rates. */ |
556 | *rate_flags &= ~(IEEE80211_TX_RC_MCS | |
557 | IEEE80211_TX_RC_40_MHZ_WIDTH); |
558 | if (rate_idx_match_legacy_mask(rate_idx, n_bitrates: sband->n_bitrates, |
559 | mask)) |
560 | return; |
561 | } else if (*rate_flags & IEEE80211_TX_RC_MCS) { |
562 | /* handle HT rates */ |
563 | if (rate_idx_match_mcs_mask(rate_idx, mcs_mask)) |
564 | return; |
565 | |
566 | /* also try the legacy rates. */ |
567 | *rate_idx = 0; |
568 | /* keep protection flags */ |
569 | *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS | |
570 | IEEE80211_TX_RC_USE_CTS_PROTECT | |
571 | IEEE80211_TX_RC_USE_SHORT_PREAMBLE); |
572 | if (rate_idx_match_legacy_mask(rate_idx, n_bitrates: sband->n_bitrates, |
573 | mask)) |
574 | return; |
575 | } else { |
576 | /* handle legacy rates */ |
577 | if (rate_idx_match_legacy_mask(rate_idx, n_bitrates: sband->n_bitrates, |
578 | mask)) |
579 | return; |
580 | |
581 | /* if HT BSS, and we handle a data frame, also try HT rates */ |
582 | switch (chan_width) { |
583 | case NL80211_CHAN_WIDTH_20_NOHT: |
584 | case NL80211_CHAN_WIDTH_5: |
585 | case NL80211_CHAN_WIDTH_10: |
586 | return; |
587 | default: |
588 | break; |
589 | } |
590 | |
591 | *rate_idx = 0; |
592 | /* keep protection flags */ |
593 | *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS | |
594 | IEEE80211_TX_RC_USE_CTS_PROTECT | |
595 | IEEE80211_TX_RC_USE_SHORT_PREAMBLE); |
596 | |
597 | *rate_flags |= IEEE80211_TX_RC_MCS; |
598 | |
599 | if (chan_width == NL80211_CHAN_WIDTH_40) |
600 | *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; |
601 | |
602 | if (rate_idx_match_mcs_mask(rate_idx, mcs_mask)) |
603 | return; |
604 | } |
605 | |
606 | /* |
607 | * Uh.. No suitable rate exists. This should not really happen with |
608 | * sane TX rate mask configurations. However, should someone manage to |
609 | * configure supported rates and TX rate mask in incompatible way, |
610 | * allow the frame to be transmitted with whatever the rate control |
611 | * selected. |
612 | */ |
613 | } |
614 | |
615 | static void rate_fixup_ratelist(struct ieee80211_vif *vif, |
616 | struct ieee80211_supported_band *sband, |
617 | struct ieee80211_tx_info *info, |
618 | struct ieee80211_tx_rate *rates, |
619 | int max_rates) |
620 | { |
621 | struct ieee80211_rate *rate; |
622 | bool inval = false; |
623 | int i; |
624 | |
625 | /* |
626 | * Set up the RTS/CTS rate as the fastest basic rate |
627 | * that is not faster than the data rate unless there |
628 | * is no basic rate slower than the data rate, in which |
629 | * case we pick the slowest basic rate |
630 | * |
631 | * XXX: Should this check all retry rates? |
632 | */ |
633 | if (!(rates[0].flags & |
634 | (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))) { |
635 | u32 basic_rates = vif->bss_conf.basic_rates; |
636 | s8 baserate = basic_rates ? ffs(basic_rates) - 1 : 0; |
637 | |
638 | rate = &sband->bitrates[rates[0].idx]; |
639 | |
640 | for (i = 0; i < sband->n_bitrates; i++) { |
641 | /* must be a basic rate */ |
642 | if (!(basic_rates & BIT(i))) |
643 | continue; |
644 | /* must not be faster than the data rate */ |
645 | if (sband->bitrates[i].bitrate > rate->bitrate) |
646 | continue; |
647 | /* maximum */ |
648 | if (sband->bitrates[baserate].bitrate < |
649 | sband->bitrates[i].bitrate) |
650 | baserate = i; |
651 | } |
652 | |
653 | info->control.rts_cts_rate_idx = baserate; |
654 | } |
655 | |
656 | for (i = 0; i < max_rates; i++) { |
657 | /* |
658 | * make sure there's no valid rate following |
659 | * an invalid one, just in case drivers don't |
660 | * take the API seriously to stop at -1. |
661 | */ |
662 | if (inval) { |
663 | rates[i].idx = -1; |
664 | continue; |
665 | } |
666 | if (rates[i].idx < 0) { |
667 | inval = true; |
668 | continue; |
669 | } |
670 | |
671 | /* |
672 | * For now assume MCS is already set up correctly, this |
673 | * needs to be fixed. |
674 | */ |
675 | if (rates[i].flags & IEEE80211_TX_RC_MCS) { |
676 | WARN_ON(rates[i].idx > 76); |
677 | |
678 | if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) && |
679 | info->control.use_cts_prot) |
680 | rates[i].flags |= |
681 | IEEE80211_TX_RC_USE_CTS_PROTECT; |
682 | continue; |
683 | } |
684 | |
685 | if (rates[i].flags & IEEE80211_TX_RC_VHT_MCS) { |
686 | WARN_ON(ieee80211_rate_get_vht_mcs(&rates[i]) > 9); |
687 | continue; |
688 | } |
689 | |
690 | /* set up RTS protection if desired */ |
691 | if (info->control.use_rts) { |
692 | rates[i].flags |= IEEE80211_TX_RC_USE_RTS_CTS; |
693 | info->control.use_cts_prot = false; |
694 | } |
695 | |
696 | /* RC is busted */ |
697 | if (WARN_ON_ONCE(rates[i].idx >= sband->n_bitrates)) { |
698 | rates[i].idx = -1; |
699 | continue; |
700 | } |
701 | |
702 | rate = &sband->bitrates[rates[i].idx]; |
703 | |
704 | /* set up short preamble */ |
705 | if (info->control.short_preamble && |
706 | rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) |
707 | rates[i].flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE; |
708 | |
709 | /* set up G protection */ |
710 | if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) && |
711 | info->control.use_cts_prot && |
712 | rate->flags & IEEE80211_RATE_ERP_G) |
713 | rates[i].flags |= IEEE80211_TX_RC_USE_CTS_PROTECT; |
714 | } |
715 | } |
716 | |
717 | |
718 | static void rate_control_fill_sta_table(struct ieee80211_sta *sta, |
719 | struct ieee80211_tx_info *info, |
720 | struct ieee80211_tx_rate *rates, |
721 | int max_rates) |
722 | { |
723 | struct ieee80211_sta_rates *ratetbl = NULL; |
724 | int i; |
725 | |
726 | if (sta && !info->control.skip_table) |
727 | ratetbl = rcu_dereference(sta->rates); |
728 | |
729 | /* Fill remaining rate slots with data from the sta rate table. */ |
730 | max_rates = min_t(int, max_rates, IEEE80211_TX_RATE_TABLE_SIZE); |
731 | for (i = 0; i < max_rates; i++) { |
732 | if (i < ARRAY_SIZE(info->control.rates) && |
733 | info->control.rates[i].idx >= 0 && |
734 | info->control.rates[i].count) { |
735 | if (rates != info->control.rates) |
736 | rates[i] = info->control.rates[i]; |
737 | } else if (ratetbl) { |
738 | rates[i].idx = ratetbl->rate[i].idx; |
739 | rates[i].flags = ratetbl->rate[i].flags; |
740 | if (info->control.use_rts) |
741 | rates[i].count = ratetbl->rate[i].count_rts; |
742 | else if (info->control.use_cts_prot) |
743 | rates[i].count = ratetbl->rate[i].count_cts; |
744 | else |
745 | rates[i].count = ratetbl->rate[i].count; |
746 | } else { |
747 | rates[i].idx = -1; |
748 | rates[i].count = 0; |
749 | } |
750 | |
751 | if (rates[i].idx < 0 || !rates[i].count) |
752 | break; |
753 | } |
754 | } |
755 | |
756 | static bool rate_control_cap_mask(struct ieee80211_sub_if_data *sdata, |
757 | struct ieee80211_supported_band *sband, |
758 | struct ieee80211_sta *sta, u32 *mask, |
759 | u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN], |
760 | u16 vht_mask[NL80211_VHT_NSS_MAX]) |
761 | { |
762 | u32 i, flags; |
763 | |
764 | *mask = sdata->rc_rateidx_mask[sband->band]; |
765 | flags = ieee80211_chandef_rate_flags(chandef: &sdata->vif.bss_conf.chanreq.oper); |
766 | for (i = 0; i < sband->n_bitrates; i++) { |
767 | if ((flags & sband->bitrates[i].flags) != flags) |
768 | *mask &= ~BIT(i); |
769 | } |
770 | |
771 | if (*mask == (1 << sband->n_bitrates) - 1 && |
772 | !sdata->rc_has_mcs_mask[sband->band] && |
773 | !sdata->rc_has_vht_mcs_mask[sband->band]) |
774 | return false; |
775 | |
776 | if (sdata->rc_has_mcs_mask[sband->band]) |
777 | memcpy(mcs_mask, sdata->rc_rateidx_mcs_mask[sband->band], |
778 | IEEE80211_HT_MCS_MASK_LEN); |
779 | else |
780 | memset(mcs_mask, 0xff, IEEE80211_HT_MCS_MASK_LEN); |
781 | |
782 | if (sdata->rc_has_vht_mcs_mask[sband->band]) |
783 | memcpy(vht_mask, sdata->rc_rateidx_vht_mcs_mask[sband->band], |
784 | sizeof(u16) * NL80211_VHT_NSS_MAX); |
785 | else |
786 | memset(vht_mask, 0xff, sizeof(u16) * NL80211_VHT_NSS_MAX); |
787 | |
788 | if (sta) { |
789 | __le16 sta_vht_cap; |
790 | u16 sta_vht_mask[NL80211_VHT_NSS_MAX]; |
791 | |
792 | /* Filter out rates that the STA does not support */ |
793 | *mask &= sta->deflink.supp_rates[sband->band]; |
794 | for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) |
795 | mcs_mask[i] &= sta->deflink.ht_cap.mcs.rx_mask[i]; |
796 | |
797 | sta_vht_cap = sta->deflink.vht_cap.vht_mcs.rx_mcs_map; |
798 | ieee80211_get_vht_mask_from_cap(vht_cap: sta_vht_cap, vht_mask: sta_vht_mask); |
799 | for (i = 0; i < NL80211_VHT_NSS_MAX; i++) |
800 | vht_mask[i] &= sta_vht_mask[i]; |
801 | } |
802 | |
803 | return true; |
804 | } |
805 | |
806 | static void |
807 | rate_control_apply_mask_ratetbl(struct sta_info *sta, |
808 | struct ieee80211_supported_band *sband, |
809 | struct ieee80211_sta_rates *rates) |
810 | { |
811 | int i; |
812 | u32 mask; |
813 | u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN]; |
814 | u16 vht_mask[NL80211_VHT_NSS_MAX]; |
815 | enum nl80211_chan_width chan_width; |
816 | |
817 | if (!rate_control_cap_mask(sdata: sta->sdata, sband, sta: &sta->sta, mask: &mask, |
818 | mcs_mask, vht_mask)) |
819 | return; |
820 | |
821 | chan_width = sta->sdata->vif.bss_conf.chanreq.oper.width; |
822 | for (i = 0; i < IEEE80211_TX_RATE_TABLE_SIZE; i++) { |
823 | if (rates->rate[i].idx < 0) |
824 | break; |
825 | |
826 | rate_idx_match_mask(rate_idx: &rates->rate[i].idx, rate_flags: &rates->rate[i].flags, |
827 | sband, chan_width, mask, mcs_mask, |
828 | vht_mask); |
829 | } |
830 | } |
831 | |
832 | static void rate_control_apply_mask(struct ieee80211_sub_if_data *sdata, |
833 | struct ieee80211_sta *sta, |
834 | struct ieee80211_supported_band *sband, |
835 | struct ieee80211_tx_rate *rates, |
836 | int max_rates) |
837 | { |
838 | enum nl80211_chan_width chan_width; |
839 | u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN]; |
840 | u32 mask; |
841 | u16 rate_flags, vht_mask[NL80211_VHT_NSS_MAX]; |
842 | int i; |
843 | |
844 | /* |
845 | * Try to enforce the rateidx mask the user wanted. skip this if the |
846 | * default mask (allow all rates) is used to save some processing for |
847 | * the common case. |
848 | */ |
849 | if (!rate_control_cap_mask(sdata, sband, sta, mask: &mask, mcs_mask, |
850 | vht_mask)) |
851 | return; |
852 | |
853 | /* |
854 | * Make sure the rate index selected for each TX rate is |
855 | * included in the configured mask and change the rate indexes |
856 | * if needed. |
857 | */ |
858 | chan_width = sdata->vif.bss_conf.chanreq.oper.width; |
859 | for (i = 0; i < max_rates; i++) { |
860 | /* Skip invalid rates */ |
861 | if (rates[i].idx < 0) |
862 | break; |
863 | |
864 | rate_flags = rates[i].flags; |
865 | rate_idx_match_mask(rate_idx: &rates[i].idx, rate_flags: &rate_flags, sband, |
866 | chan_width, mask, mcs_mask, vht_mask); |
867 | rates[i].flags = rate_flags; |
868 | } |
869 | } |
870 | |
871 | void ieee80211_get_tx_rates(struct ieee80211_vif *vif, |
872 | struct ieee80211_sta *sta, |
873 | struct sk_buff *skb, |
874 | struct ieee80211_tx_rate *dest, |
875 | int max_rates) |
876 | { |
877 | struct ieee80211_sub_if_data *sdata; |
878 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
879 | struct ieee80211_supported_band *sband; |
880 | |
881 | rate_control_fill_sta_table(sta, info, rates: dest, max_rates); |
882 | |
883 | if (!vif) |
884 | return; |
885 | |
886 | sdata = vif_to_sdata(p: vif); |
887 | sband = sdata->local->hw.wiphy->bands[info->band]; |
888 | |
889 | if (ieee80211_is_tx_data(skb)) |
890 | rate_control_apply_mask(sdata, sta, sband, rates: dest, max_rates); |
891 | |
892 | if (dest[0].idx < 0) |
893 | __rate_control_send_low(hw: &sdata->local->hw, sband, sta, info, |
894 | rate_mask: sdata->rc_rateidx_mask[info->band]); |
895 | |
896 | if (sta) |
897 | rate_fixup_ratelist(vif, sband, info, rates: dest, max_rates); |
898 | } |
899 | EXPORT_SYMBOL(ieee80211_get_tx_rates); |
900 | |
901 | void rate_control_get_rate(struct ieee80211_sub_if_data *sdata, |
902 | struct sta_info *sta, |
903 | struct ieee80211_tx_rate_control *txrc) |
904 | { |
905 | struct rate_control_ref *ref = sdata->local->rate_ctrl; |
906 | void *priv_sta = NULL; |
907 | struct ieee80211_sta *ista = NULL; |
908 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb: txrc->skb); |
909 | int i; |
910 | |
911 | for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { |
912 | info->control.rates[i].idx = -1; |
913 | info->control.rates[i].flags = 0; |
914 | info->control.rates[i].count = 0; |
915 | } |
916 | |
917 | if (rate_control_send_low(pubsta: sta ? &sta->sta : NULL, txrc)) |
918 | return; |
919 | |
920 | if (ieee80211_hw_check(&sdata->local->hw, HAS_RATE_CONTROL)) |
921 | return; |
922 | |
923 | if (sta && test_sta_flag(sta, flag: WLAN_STA_RATE_CONTROL)) { |
924 | ista = &sta->sta; |
925 | priv_sta = sta->rate_ctrl_priv; |
926 | } |
927 | |
928 | if (ista) { |
929 | spin_lock_bh(lock: &sta->rate_ctrl_lock); |
930 | ref->ops->get_rate(ref->priv, ista, priv_sta, txrc); |
931 | spin_unlock_bh(lock: &sta->rate_ctrl_lock); |
932 | } else { |
933 | rate_control_send_low(NULL, txrc); |
934 | } |
935 | |
936 | if (ieee80211_hw_check(&sdata->local->hw, SUPPORTS_RC_TABLE)) |
937 | return; |
938 | |
939 | ieee80211_get_tx_rates(&sdata->vif, ista, txrc->skb, |
940 | info->control.rates, |
941 | ARRAY_SIZE(info->control.rates)); |
942 | } |
943 | |
944 | int rate_control_set_rates(struct ieee80211_hw *hw, |
945 | struct ieee80211_sta *pubsta, |
946 | struct ieee80211_sta_rates *rates) |
947 | { |
948 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
949 | struct ieee80211_sta_rates *old; |
950 | struct ieee80211_supported_band *sband; |
951 | |
952 | sband = ieee80211_get_sband(sdata: sta->sdata); |
953 | if (!sband) |
954 | return -EINVAL; |
955 | rate_control_apply_mask_ratetbl(sta, sband, rates); |
956 | /* |
957 | * mac80211 guarantees that this function will not be called |
958 | * concurrently, so the following RCU access is safe, even without |
959 | * extra locking. This can not be checked easily, so we just set |
960 | * the condition to true. |
961 | */ |
962 | old = rcu_dereference_protected(pubsta->rates, true); |
963 | rcu_assign_pointer(pubsta->rates, rates); |
964 | if (old) |
965 | kfree_rcu(old, rcu_head); |
966 | |
967 | if (sta->uploaded) |
968 | drv_sta_rate_tbl_update(local: hw_to_local(hw), sdata: sta->sdata, sta: pubsta); |
969 | |
970 | ieee80211_sta_set_expected_throughput(pubsta, thr: sta_get_expected_throughput(sta)); |
971 | |
972 | return 0; |
973 | } |
974 | EXPORT_SYMBOL(rate_control_set_rates); |
975 | |
976 | int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local, |
977 | const char *name) |
978 | { |
979 | struct rate_control_ref *ref; |
980 | |
981 | ASSERT_RTNL(); |
982 | |
983 | if (local->open_count) |
984 | return -EBUSY; |
985 | |
986 | if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { |
987 | if (WARN_ON(!local->ops->set_rts_threshold)) |
988 | return -EINVAL; |
989 | return 0; |
990 | } |
991 | |
992 | ref = rate_control_alloc(name, local); |
993 | if (!ref) { |
994 | wiphy_warn(local->hw.wiphy, |
995 | "Failed to select rate control algorithm\n" ); |
996 | return -ENOENT; |
997 | } |
998 | |
999 | WARN_ON(local->rate_ctrl); |
1000 | local->rate_ctrl = ref; |
1001 | |
1002 | wiphy_debug(local->hw.wiphy, "Selected rate control algorithm '%s'\n" , |
1003 | ref->ops->name); |
1004 | |
1005 | return 0; |
1006 | } |
1007 | |
1008 | void rate_control_deinitialize(struct ieee80211_local *local) |
1009 | { |
1010 | struct rate_control_ref *ref; |
1011 | |
1012 | ref = local->rate_ctrl; |
1013 | |
1014 | if (!ref) |
1015 | return; |
1016 | |
1017 | local->rate_ctrl = NULL; |
1018 | rate_control_free(local, ctrl_ref: ref); |
1019 | } |
1020 | |