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[mirror_ubuntu-artful-kernel.git] / net / mac80211 / rate.c
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>
12 #include <linux/rtnetlink.h>
13 #include <linux/module.h>
14 #include <linux/slab.h>
15 #include "rate.h"
16 #include "ieee80211_i.h"
17 #include "debugfs.h"
18
19 struct rate_control_alg {
20 struct list_head list;
21 const struct rate_control_ops *ops;
22 };
23
24 static LIST_HEAD(rate_ctrl_algs);
25 static DEFINE_MUTEX(rate_ctrl_mutex);
26
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
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
91 int ieee80211_rate_control_register(const struct rate_control_ops *ops)
92 {
93 struct rate_control_alg *alg;
94
95 if (!ops->name)
96 return -EINVAL;
97
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);
103 mutex_unlock(&rate_ctrl_mutex);
104 return -EALREADY;
105 }
106 }
107
108 alg = kzalloc(sizeof(*alg), GFP_KERNEL);
109 if (alg == NULL) {
110 mutex_unlock(&rate_ctrl_mutex);
111 return -ENOMEM;
112 }
113 alg->ops = ops;
114
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
122 void ieee80211_rate_control_unregister(const struct rate_control_ops *ops)
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);
130 kfree(alg);
131 break;
132 }
133 }
134 mutex_unlock(&rate_ctrl_mutex);
135 }
136 EXPORT_SYMBOL(ieee80211_rate_control_unregister);
137
138 static const struct rate_control_ops *
139 ieee80211_try_rate_control_ops_get(const char *name)
140 {
141 struct rate_control_alg *alg;
142 const struct rate_control_ops *ops = NULL;
143
144 if (!name)
145 return NULL;
146
147 mutex_lock(&rate_ctrl_mutex);
148 list_for_each_entry(alg, &rate_ctrl_algs, list) {
149 if (!strcmp(alg->ops->name, name)) {
150 ops = alg->ops;
151 break;
152 }
153 }
154 mutex_unlock(&rate_ctrl_mutex);
155 return ops;
156 }
157
158 /* Get the rate control algorithm. */
159 static const struct rate_control_ops *
160 ieee80211_rate_control_ops_get(const char *name)
161 {
162 const struct rate_control_ops *ops;
163 const char *alg_name;
164
165 kernel_param_lock(THIS_MODULE);
166 if (!name)
167 alg_name = ieee80211_default_rc_algo;
168 else
169 alg_name = name;
170
171 ops = ieee80211_try_rate_control_ops_get(alg_name);
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
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);
179 kernel_param_unlock(THIS_MODULE);
180
181 return ops;
182 }
183
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,
197 .open = simple_open,
198 .llseek = default_llseek,
199 };
200 #endif
201
202 static struct rate_control_ref *rate_control_alloc(const char *name,
203 struct ieee80211_local *local)
204 {
205 struct dentry *debugfsdir = NULL;
206 struct rate_control_ref *ref;
207
208 ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL);
209 if (!ref)
210 return NULL;
211 ref->local = local;
212 ref->ops = ieee80211_rate_control_ops_get(name);
213 if (!ref->ops)
214 goto free;
215
216 #ifdef CONFIG_MAC80211_DEBUGFS
217 debugfsdir = debugfs_create_dir("rc", local->hw.wiphy->debugfsdir);
218 local->debugfs.rcdir = debugfsdir;
219 debugfs_create_file("name", 0400, debugfsdir, ref, &rcname_ops);
220 #endif
221
222 ref->priv = ref->ops->alloc(&local->hw, debugfsdir);
223 if (!ref->priv)
224 goto free;
225 return ref;
226
227 free:
228 kfree(ref);
229 return NULL;
230 }
231
232 static void rate_control_free(struct rate_control_ref *ctrl_ref)
233 {
234 ctrl_ref->ops->free(ctrl_ref->priv);
235
236 #ifdef CONFIG_MAC80211_DEBUGFS
237 debugfs_remove_recursive(ctrl_ref->local->debugfs.rcdir);
238 ctrl_ref->local->debugfs.rcdir = NULL;
239 #endif
240
241 kfree(ctrl_ref);
242 }
243
244 static bool rc_no_data_or_no_ack_use_min(struct ieee80211_tx_rate_control *txrc)
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
253 return (info->flags & (IEEE80211_TX_CTL_NO_ACK |
254 IEEE80211_TX_CTL_USE_MINRATE)) ||
255 !ieee80211_is_data(fc);
256 }
257
258 static void rc_send_low_basicrate(s8 *idx, u32 basic_rates,
259 struct ieee80211_supported_band *sband)
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
270 for (i = *idx + 1; i <= sband->n_bitrates; i++) {
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
280 static void __rate_control_send_low(struct ieee80211_hw *hw,
281 struct ieee80211_supported_band *sband,
282 struct ieee80211_sta *sta,
283 struct ieee80211_tx_info *info,
284 u32 rate_mask)
285 {
286 int i;
287 u32 rate_flags =
288 ieee80211_chandef_rate_flags(&hw->conf.chandef);
289
290 if ((sband->band == NL80211_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;
295 for (i = 0; i < sband->n_bitrates; i++) {
296 if (!(rate_mask & BIT(i)))
297 continue;
298
299 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
300 continue;
301
302 if (!rate_supported(sta, sband->band, i))
303 continue;
304
305 info->control.rates[0].idx = i;
306 break;
307 }
308 WARN_ONCE(i == sband->n_bitrates,
309 "no supported rates (0x%x) in rate_mask 0x%x with flags 0x%x\n",
310 sta ? sta->supp_rates[sband->band] : -1,
311 rate_mask, rate_flags);
312
313 info->control.rates[0].count =
314 (info->flags & IEEE80211_TX_CTL_NO_ACK) ?
315 1 : hw->max_rate_tries;
316
317 info->control.skip_table = 1;
318 }
319
320
321 bool rate_control_send_low(struct ieee80211_sta *pubsta,
322 void *priv_sta,
323 struct ieee80211_tx_rate_control *txrc)
324 {
325 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
326 struct ieee80211_supported_band *sband = txrc->sband;
327 struct sta_info *sta;
328 int mcast_rate;
329 bool use_basicrate = false;
330
331 if (!pubsta || !priv_sta || rc_no_data_or_no_ack_use_min(txrc)) {
332 __rate_control_send_low(txrc->hw, sband, pubsta, info,
333 txrc->rate_idx_mask);
334
335 if (!pubsta && txrc->bss) {
336 mcast_rate = txrc->bss_conf->mcast_rate[sband->band];
337 if (mcast_rate > 0) {
338 info->control.rates[0].idx = mcast_rate - 1;
339 return true;
340 }
341 use_basicrate = true;
342 } else if (pubsta) {
343 sta = container_of(pubsta, struct sta_info, sta);
344 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
345 use_basicrate = true;
346 }
347
348 if (use_basicrate)
349 rc_send_low_basicrate(&info->control.rates[0].idx,
350 txrc->bss_conf->basic_rates,
351 sband);
352
353 return true;
354 }
355 return false;
356 }
357 EXPORT_SYMBOL(rate_control_send_low);
358
359 static bool rate_idx_match_legacy_mask(s8 *rate_idx, int n_bitrates, u32 mask)
360 {
361 int j;
362
363 /* See whether the selected rate or anything below it is allowed. */
364 for (j = *rate_idx; j >= 0; j--) {
365 if (mask & (1 << j)) {
366 /* Okay, found a suitable rate. Use it. */
367 *rate_idx = j;
368 return true;
369 }
370 }
371
372 /* Try to find a higher rate that would be allowed */
373 for (j = *rate_idx + 1; j < n_bitrates; j++) {
374 if (mask & (1 << j)) {
375 /* Okay, found a suitable rate. Use it. */
376 *rate_idx = j;
377 return true;
378 }
379 }
380 return false;
381 }
382
383 static bool rate_idx_match_mcs_mask(s8 *rate_idx, u8 *mcs_mask)
384 {
385 int i, j;
386 int ridx, rbit;
387
388 ridx = *rate_idx / 8;
389 rbit = *rate_idx % 8;
390
391 /* sanity check */
392 if (ridx < 0 || ridx >= IEEE80211_HT_MCS_MASK_LEN)
393 return false;
394
395 /* See whether the selected rate or anything below it is allowed. */
396 for (i = ridx; i >= 0; i--) {
397 for (j = rbit; j >= 0; j--)
398 if (mcs_mask[i] & BIT(j)) {
399 *rate_idx = i * 8 + j;
400 return true;
401 }
402 rbit = 7;
403 }
404
405 /* Try to find a higher rate that would be allowed */
406 ridx = (*rate_idx + 1) / 8;
407 rbit = (*rate_idx + 1) % 8;
408
409 for (i = ridx; i < IEEE80211_HT_MCS_MASK_LEN; i++) {
410 for (j = rbit; j < 8; j++)
411 if (mcs_mask[i] & BIT(j)) {
412 *rate_idx = i * 8 + j;
413 return true;
414 }
415 rbit = 0;
416 }
417 return false;
418 }
419
420 static bool rate_idx_match_vht_mcs_mask(s8 *rate_idx, u16 *vht_mask)
421 {
422 int i, j;
423 int ridx, rbit;
424
425 ridx = *rate_idx >> 4;
426 rbit = *rate_idx & 0xf;
427
428 if (ridx < 0 || ridx >= NL80211_VHT_NSS_MAX)
429 return false;
430
431 /* See whether the selected rate or anything below it is allowed. */
432 for (i = ridx; i >= 0; i--) {
433 for (j = rbit; j >= 0; j--) {
434 if (vht_mask[i] & BIT(j)) {
435 *rate_idx = (i << 4) | j;
436 return true;
437 }
438 }
439 rbit = 15;
440 }
441
442 /* Try to find a higher rate that would be allowed */
443 ridx = (*rate_idx + 1) >> 4;
444 rbit = (*rate_idx + 1) & 0xf;
445
446 for (i = ridx; i < NL80211_VHT_NSS_MAX; i++) {
447 for (j = rbit; j < 16; j++) {
448 if (vht_mask[i] & BIT(j)) {
449 *rate_idx = (i << 4) | j;
450 return true;
451 }
452 }
453 rbit = 0;
454 }
455 return false;
456 }
457
458 static void rate_idx_match_mask(s8 *rate_idx, u16 *rate_flags,
459 struct ieee80211_supported_band *sband,
460 enum nl80211_chan_width chan_width,
461 u32 mask,
462 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN],
463 u16 vht_mask[NL80211_VHT_NSS_MAX])
464 {
465 if (*rate_flags & IEEE80211_TX_RC_VHT_MCS) {
466 /* handle VHT rates */
467 if (rate_idx_match_vht_mcs_mask(rate_idx, vht_mask))
468 return;
469
470 *rate_idx = 0;
471 /* keep protection flags */
472 *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS |
473 IEEE80211_TX_RC_USE_CTS_PROTECT |
474 IEEE80211_TX_RC_USE_SHORT_PREAMBLE);
475
476 *rate_flags |= IEEE80211_TX_RC_MCS;
477 if (chan_width == NL80211_CHAN_WIDTH_40)
478 *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
479
480 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask))
481 return;
482
483 /* also try the legacy rates. */
484 *rate_flags &= ~(IEEE80211_TX_RC_MCS |
485 IEEE80211_TX_RC_40_MHZ_WIDTH);
486 if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates,
487 mask))
488 return;
489 } else if (*rate_flags & IEEE80211_TX_RC_MCS) {
490 /* handle HT rates */
491 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask))
492 return;
493
494 /* also try the legacy rates. */
495 *rate_idx = 0;
496 /* keep protection flags */
497 *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS |
498 IEEE80211_TX_RC_USE_CTS_PROTECT |
499 IEEE80211_TX_RC_USE_SHORT_PREAMBLE);
500 if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates,
501 mask))
502 return;
503 } else {
504 /* handle legacy rates */
505 if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates,
506 mask))
507 return;
508
509 /* if HT BSS, and we handle a data frame, also try HT rates */
510 switch (chan_width) {
511 case NL80211_CHAN_WIDTH_20_NOHT:
512 case NL80211_CHAN_WIDTH_5:
513 case NL80211_CHAN_WIDTH_10:
514 return;
515 default:
516 break;
517 }
518
519 *rate_idx = 0;
520 /* keep protection flags */
521 *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS |
522 IEEE80211_TX_RC_USE_CTS_PROTECT |
523 IEEE80211_TX_RC_USE_SHORT_PREAMBLE);
524
525 *rate_flags |= IEEE80211_TX_RC_MCS;
526
527 if (chan_width == NL80211_CHAN_WIDTH_40)
528 *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
529
530 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask))
531 return;
532 }
533
534 /*
535 * Uh.. No suitable rate exists. This should not really happen with
536 * sane TX rate mask configurations. However, should someone manage to
537 * configure supported rates and TX rate mask in incompatible way,
538 * allow the frame to be transmitted with whatever the rate control
539 * selected.
540 */
541 }
542
543 static void rate_fixup_ratelist(struct ieee80211_vif *vif,
544 struct ieee80211_supported_band *sband,
545 struct ieee80211_tx_info *info,
546 struct ieee80211_tx_rate *rates,
547 int max_rates)
548 {
549 struct ieee80211_rate *rate;
550 bool inval = false;
551 int i;
552
553 /*
554 * Set up the RTS/CTS rate as the fastest basic rate
555 * that is not faster than the data rate unless there
556 * is no basic rate slower than the data rate, in which
557 * case we pick the slowest basic rate
558 *
559 * XXX: Should this check all retry rates?
560 */
561 if (!(rates[0].flags &
562 (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))) {
563 u32 basic_rates = vif->bss_conf.basic_rates;
564 s8 baserate = basic_rates ? ffs(basic_rates) - 1 : 0;
565
566 rate = &sband->bitrates[rates[0].idx];
567
568 for (i = 0; i < sband->n_bitrates; i++) {
569 /* must be a basic rate */
570 if (!(basic_rates & BIT(i)))
571 continue;
572 /* must not be faster than the data rate */
573 if (sband->bitrates[i].bitrate > rate->bitrate)
574 continue;
575 /* maximum */
576 if (sband->bitrates[baserate].bitrate <
577 sband->bitrates[i].bitrate)
578 baserate = i;
579 }
580
581 info->control.rts_cts_rate_idx = baserate;
582 }
583
584 for (i = 0; i < max_rates; i++) {
585 /*
586 * make sure there's no valid rate following
587 * an invalid one, just in case drivers don't
588 * take the API seriously to stop at -1.
589 */
590 if (inval) {
591 rates[i].idx = -1;
592 continue;
593 }
594 if (rates[i].idx < 0) {
595 inval = true;
596 continue;
597 }
598
599 /*
600 * For now assume MCS is already set up correctly, this
601 * needs to be fixed.
602 */
603 if (rates[i].flags & IEEE80211_TX_RC_MCS) {
604 WARN_ON(rates[i].idx > 76);
605
606 if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) &&
607 info->control.use_cts_prot)
608 rates[i].flags |=
609 IEEE80211_TX_RC_USE_CTS_PROTECT;
610 continue;
611 }
612
613 if (rates[i].flags & IEEE80211_TX_RC_VHT_MCS) {
614 WARN_ON(ieee80211_rate_get_vht_mcs(&rates[i]) > 9);
615 continue;
616 }
617
618 /* set up RTS protection if desired */
619 if (info->control.use_rts) {
620 rates[i].flags |= IEEE80211_TX_RC_USE_RTS_CTS;
621 info->control.use_cts_prot = false;
622 }
623
624 /* RC is busted */
625 if (WARN_ON_ONCE(rates[i].idx >= sband->n_bitrates)) {
626 rates[i].idx = -1;
627 continue;
628 }
629
630 rate = &sband->bitrates[rates[i].idx];
631
632 /* set up short preamble */
633 if (info->control.short_preamble &&
634 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
635 rates[i].flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
636
637 /* set up G protection */
638 if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) &&
639 info->control.use_cts_prot &&
640 rate->flags & IEEE80211_RATE_ERP_G)
641 rates[i].flags |= IEEE80211_TX_RC_USE_CTS_PROTECT;
642 }
643 }
644
645
646 static void rate_control_fill_sta_table(struct ieee80211_sta *sta,
647 struct ieee80211_tx_info *info,
648 struct ieee80211_tx_rate *rates,
649 int max_rates)
650 {
651 struct ieee80211_sta_rates *ratetbl = NULL;
652 int i;
653
654 if (sta && !info->control.skip_table)
655 ratetbl = rcu_dereference(sta->rates);
656
657 /* Fill remaining rate slots with data from the sta rate table. */
658 max_rates = min_t(int, max_rates, IEEE80211_TX_RATE_TABLE_SIZE);
659 for (i = 0; i < max_rates; i++) {
660 if (i < ARRAY_SIZE(info->control.rates) &&
661 info->control.rates[i].idx >= 0 &&
662 info->control.rates[i].count) {
663 if (rates != info->control.rates)
664 rates[i] = info->control.rates[i];
665 } else if (ratetbl) {
666 rates[i].idx = ratetbl->rate[i].idx;
667 rates[i].flags = ratetbl->rate[i].flags;
668 if (info->control.use_rts)
669 rates[i].count = ratetbl->rate[i].count_rts;
670 else if (info->control.use_cts_prot)
671 rates[i].count = ratetbl->rate[i].count_cts;
672 else
673 rates[i].count = ratetbl->rate[i].count;
674 } else {
675 rates[i].idx = -1;
676 rates[i].count = 0;
677 }
678
679 if (rates[i].idx < 0 || !rates[i].count)
680 break;
681 }
682 }
683
684 static bool rate_control_cap_mask(struct ieee80211_sub_if_data *sdata,
685 struct ieee80211_supported_band *sband,
686 struct ieee80211_sta *sta, u32 *mask,
687 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN],
688 u16 vht_mask[NL80211_VHT_NSS_MAX])
689 {
690 u32 i, flags;
691
692 *mask = sdata->rc_rateidx_mask[sband->band];
693 flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
694 for (i = 0; i < sband->n_bitrates; i++) {
695 if ((flags & sband->bitrates[i].flags) != flags)
696 *mask &= ~BIT(i);
697 }
698
699 if (*mask == (1 << sband->n_bitrates) - 1 &&
700 !sdata->rc_has_mcs_mask[sband->band] &&
701 !sdata->rc_has_vht_mcs_mask[sband->band])
702 return false;
703
704 if (sdata->rc_has_mcs_mask[sband->band])
705 memcpy(mcs_mask, sdata->rc_rateidx_mcs_mask[sband->band],
706 IEEE80211_HT_MCS_MASK_LEN);
707 else
708 memset(mcs_mask, 0xff, IEEE80211_HT_MCS_MASK_LEN);
709
710 if (sdata->rc_has_vht_mcs_mask[sband->band])
711 memcpy(vht_mask, sdata->rc_rateidx_vht_mcs_mask[sband->band],
712 sizeof(u16) * NL80211_VHT_NSS_MAX);
713 else
714 memset(vht_mask, 0xff, sizeof(u16) * NL80211_VHT_NSS_MAX);
715
716 if (sta) {
717 __le16 sta_vht_cap;
718 u16 sta_vht_mask[NL80211_VHT_NSS_MAX];
719
720 /* Filter out rates that the STA does not support */
721 *mask &= sta->supp_rates[sband->band];
722 for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++)
723 mcs_mask[i] &= sta->ht_cap.mcs.rx_mask[i];
724
725 sta_vht_cap = sta->vht_cap.vht_mcs.rx_mcs_map;
726 ieee80211_get_vht_mask_from_cap(sta_vht_cap, sta_vht_mask);
727 for (i = 0; i < NL80211_VHT_NSS_MAX; i++)
728 vht_mask[i] &= sta_vht_mask[i];
729 }
730
731 return true;
732 }
733
734 static void
735 rate_control_apply_mask_ratetbl(struct sta_info *sta,
736 struct ieee80211_supported_band *sband,
737 struct ieee80211_sta_rates *rates)
738 {
739 int i;
740 u32 mask;
741 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN];
742 u16 vht_mask[NL80211_VHT_NSS_MAX];
743 enum nl80211_chan_width chan_width;
744
745 if (!rate_control_cap_mask(sta->sdata, sband, &sta->sta, &mask,
746 mcs_mask, vht_mask))
747 return;
748
749 chan_width = sta->sdata->vif.bss_conf.chandef.width;
750 for (i = 0; i < IEEE80211_TX_RATE_TABLE_SIZE; i++) {
751 if (rates->rate[i].idx < 0)
752 break;
753
754 rate_idx_match_mask(&rates->rate[i].idx, &rates->rate[i].flags,
755 sband, chan_width, mask, mcs_mask,
756 vht_mask);
757 }
758 }
759
760 static void rate_control_apply_mask(struct ieee80211_sub_if_data *sdata,
761 struct ieee80211_sta *sta,
762 struct ieee80211_supported_band *sband,
763 struct ieee80211_tx_rate *rates,
764 int max_rates)
765 {
766 enum nl80211_chan_width chan_width;
767 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN];
768 u32 mask;
769 u16 rate_flags, vht_mask[NL80211_VHT_NSS_MAX];
770 int i;
771
772 /*
773 * Try to enforce the rateidx mask the user wanted. skip this if the
774 * default mask (allow all rates) is used to save some processing for
775 * the common case.
776 */
777 if (!rate_control_cap_mask(sdata, sband, sta, &mask, mcs_mask,
778 vht_mask))
779 return;
780
781 /*
782 * Make sure the rate index selected for each TX rate is
783 * included in the configured mask and change the rate indexes
784 * if needed.
785 */
786 chan_width = sdata->vif.bss_conf.chandef.width;
787 for (i = 0; i < max_rates; i++) {
788 /* Skip invalid rates */
789 if (rates[i].idx < 0)
790 break;
791
792 rate_flags = rates[i].flags;
793 rate_idx_match_mask(&rates[i].idx, &rate_flags, sband,
794 chan_width, mask, mcs_mask, vht_mask);
795 rates[i].flags = rate_flags;
796 }
797 }
798
799 void ieee80211_get_tx_rates(struct ieee80211_vif *vif,
800 struct ieee80211_sta *sta,
801 struct sk_buff *skb,
802 struct ieee80211_tx_rate *dest,
803 int max_rates)
804 {
805 struct ieee80211_sub_if_data *sdata;
806 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
807 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
808 struct ieee80211_supported_band *sband;
809
810 rate_control_fill_sta_table(sta, info, dest, max_rates);
811
812 if (!vif)
813 return;
814
815 sdata = vif_to_sdata(vif);
816 sband = sdata->local->hw.wiphy->bands[info->band];
817
818 if (ieee80211_is_data(hdr->frame_control))
819 rate_control_apply_mask(sdata, sta, sband, dest, max_rates);
820
821 if (dest[0].idx < 0)
822 __rate_control_send_low(&sdata->local->hw, sband, sta, info,
823 sdata->rc_rateidx_mask[info->band]);
824
825 if (sta)
826 rate_fixup_ratelist(vif, sband, info, dest, max_rates);
827 }
828 EXPORT_SYMBOL(ieee80211_get_tx_rates);
829
830 void rate_control_get_rate(struct ieee80211_sub_if_data *sdata,
831 struct sta_info *sta,
832 struct ieee80211_tx_rate_control *txrc)
833 {
834 struct rate_control_ref *ref = sdata->local->rate_ctrl;
835 void *priv_sta = NULL;
836 struct ieee80211_sta *ista = NULL;
837 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
838 int i;
839
840 if (sta && test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) {
841 ista = &sta->sta;
842 priv_sta = sta->rate_ctrl_priv;
843 }
844
845 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
846 info->control.rates[i].idx = -1;
847 info->control.rates[i].flags = 0;
848 info->control.rates[i].count = 0;
849 }
850
851 if (ieee80211_hw_check(&sdata->local->hw, HAS_RATE_CONTROL))
852 return;
853
854 if (ista) {
855 spin_lock_bh(&sta->rate_ctrl_lock);
856 ref->ops->get_rate(ref->priv, ista, priv_sta, txrc);
857 spin_unlock_bh(&sta->rate_ctrl_lock);
858 } else {
859 ref->ops->get_rate(ref->priv, NULL, NULL, txrc);
860 }
861
862 if (ieee80211_hw_check(&sdata->local->hw, SUPPORTS_RC_TABLE))
863 return;
864
865 ieee80211_get_tx_rates(&sdata->vif, ista, txrc->skb,
866 info->control.rates,
867 ARRAY_SIZE(info->control.rates));
868 }
869
870 int rate_control_set_rates(struct ieee80211_hw *hw,
871 struct ieee80211_sta *pubsta,
872 struct ieee80211_sta_rates *rates)
873 {
874 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
875 struct ieee80211_sta_rates *old;
876 struct ieee80211_supported_band *sband;
877
878 sband = hw->wiphy->bands[ieee80211_get_sdata_band(sta->sdata)];
879 rate_control_apply_mask_ratetbl(sta, sband, rates);
880 /*
881 * mac80211 guarantees that this function will not be called
882 * concurrently, so the following RCU access is safe, even without
883 * extra locking. This can not be checked easily, so we just set
884 * the condition to true.
885 */
886 old = rcu_dereference_protected(pubsta->rates, true);
887 rcu_assign_pointer(pubsta->rates, rates);
888 if (old)
889 kfree_rcu(old, rcu_head);
890
891 drv_sta_rate_tbl_update(hw_to_local(hw), sta->sdata, pubsta);
892
893 return 0;
894 }
895 EXPORT_SYMBOL(rate_control_set_rates);
896
897 int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local,
898 const char *name)
899 {
900 struct rate_control_ref *ref;
901
902 ASSERT_RTNL();
903
904 if (local->open_count)
905 return -EBUSY;
906
907 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
908 if (WARN_ON(!local->ops->set_rts_threshold))
909 return -EINVAL;
910 return 0;
911 }
912
913 ref = rate_control_alloc(name, local);
914 if (!ref) {
915 wiphy_warn(local->hw.wiphy,
916 "Failed to select rate control algorithm\n");
917 return -ENOENT;
918 }
919
920 WARN_ON(local->rate_ctrl);
921 local->rate_ctrl = ref;
922
923 wiphy_debug(local->hw.wiphy, "Selected rate control algorithm '%s'\n",
924 ref->ops->name);
925
926 return 0;
927 }
928
929 void rate_control_deinitialize(struct ieee80211_local *local)
930 {
931 struct rate_control_ref *ref;
932
933 ref = local->rate_ctrl;
934
935 if (!ref)
936 return;
937
938 local->rate_ctrl = NULL;
939 rate_control_free(ref);
940 }
941