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