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Jiri Bencf0706e82007-05-05 11:45:53 -07001/*
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>
Johannes Bergff688082007-07-27 15:43:23 +020012#include <linux/rtnetlink.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090013#include <linux/slab.h>
Paul Gortmaker3a9a2312011-05-27 09:12:25 -040014#include <linux/module.h>
Johannes Berg2c8dccc2008-04-08 15:14:40 -040015#include "rate.h"
Jiri Bencf0706e82007-05-05 11:45:53 -070016#include "ieee80211_i.h"
Johannes Berg4b7679a2008-09-18 18:14:18 +020017#include "debugfs.h"
Jiri Bencf0706e82007-05-05 11:45:53 -070018
19struct rate_control_alg {
20 struct list_head list;
21 struct rate_control_ops *ops;
22};
23
24static LIST_HEAD(rate_ctrl_algs);
25static DEFINE_MUTEX(rate_ctrl_mutex);
26
Stefano Brivioc21b39a2007-12-19 01:26:16 +010027static char *ieee80211_default_rc_algo = CONFIG_MAC80211_RC_DEFAULT;
28module_param(ieee80211_default_rc_algo, charp, 0644);
29MODULE_PARM_DESC(ieee80211_default_rc_algo,
30 "Default rate control algorithm for mac80211 to use");
31
Jiri Bencf0706e82007-05-05 11:45:53 -070032int ieee80211_rate_control_register(struct rate_control_ops *ops)
33{
34 struct rate_control_alg *alg;
35
Johannes Bergac71c692007-10-28 14:17:44 +010036 if (!ops->name)
37 return -EINVAL;
38
Johannes Berg999acd92007-10-28 14:49:33 +010039 mutex_lock(&rate_ctrl_mutex);
40 list_for_each_entry(alg, &rate_ctrl_algs, list) {
41 if (!strcmp(alg->ops->name, ops->name)) {
42 /* don't register an algorithm twice */
43 WARN_ON(1);
Cyrill Gorcunovb808ab12007-12-13 15:52:11 -080044 mutex_unlock(&rate_ctrl_mutex);
Johannes Berg999acd92007-10-28 14:49:33 +010045 return -EALREADY;
46 }
47 }
48
Yoann Padioleaudd00cc42007-07-19 01:49:03 -070049 alg = kzalloc(sizeof(*alg), GFP_KERNEL);
Jiri Bencf0706e82007-05-05 11:45:53 -070050 if (alg == NULL) {
Johannes Berg999acd92007-10-28 14:49:33 +010051 mutex_unlock(&rate_ctrl_mutex);
Jiri Bencf0706e82007-05-05 11:45:53 -070052 return -ENOMEM;
53 }
Jiri Bencf0706e82007-05-05 11:45:53 -070054 alg->ops = ops;
55
Jiri Bencf0706e82007-05-05 11:45:53 -070056 list_add_tail(&alg->list, &rate_ctrl_algs);
57 mutex_unlock(&rate_ctrl_mutex);
58
59 return 0;
60}
61EXPORT_SYMBOL(ieee80211_rate_control_register);
62
63void ieee80211_rate_control_unregister(struct rate_control_ops *ops)
64{
65 struct rate_control_alg *alg;
66
67 mutex_lock(&rate_ctrl_mutex);
68 list_for_each_entry(alg, &rate_ctrl_algs, list) {
69 if (alg->ops == ops) {
70 list_del(&alg->list);
Cyrill Gorcunov20880e82007-12-13 16:17:03 -080071 kfree(alg);
Jiri Bencf0706e82007-05-05 11:45:53 -070072 break;
73 }
74 }
75 mutex_unlock(&rate_ctrl_mutex);
Jiri Bencf0706e82007-05-05 11:45:53 -070076}
77EXPORT_SYMBOL(ieee80211_rate_control_unregister);
78
79static struct rate_control_ops *
80ieee80211_try_rate_control_ops_get(const char *name)
81{
82 struct rate_control_alg *alg;
83 struct rate_control_ops *ops = NULL;
84
Johannes Bergac71c692007-10-28 14:17:44 +010085 if (!name)
86 return NULL;
87
Jiri Bencf0706e82007-05-05 11:45:53 -070088 mutex_lock(&rate_ctrl_mutex);
89 list_for_each_entry(alg, &rate_ctrl_algs, list) {
Johannes Bergac71c692007-10-28 14:17:44 +010090 if (!strcmp(alg->ops->name, name))
Jiri Bencf0706e82007-05-05 11:45:53 -070091 if (try_module_get(alg->ops->module)) {
92 ops = alg->ops;
93 break;
94 }
95 }
96 mutex_unlock(&rate_ctrl_mutex);
97 return ops;
98}
99
Stefano Brivioc21b39a2007-12-19 01:26:16 +0100100/* Get the rate control algorithm. */
Jiri Bencf0706e82007-05-05 11:45:53 -0700101static struct rate_control_ops *
102ieee80211_rate_control_ops_get(const char *name)
103{
104 struct rate_control_ops *ops;
Stefano Brivioc21b39a2007-12-19 01:26:16 +0100105 const char *alg_name;
Jiri Bencf0706e82007-05-05 11:45:53 -0700106
Rusty Russelld6d1b652010-08-11 23:04:27 -0600107 kparam_block_sysfs_write(ieee80211_default_rc_algo);
Johannes Bergac71c692007-10-28 14:17:44 +0100108 if (!name)
Stefano Brivioc21b39a2007-12-19 01:26:16 +0100109 alg_name = ieee80211_default_rc_algo;
110 else
111 alg_name = name;
Johannes Bergac71c692007-10-28 14:17:44 +0100112
Stefano Brivioc21b39a2007-12-19 01:26:16 +0100113 ops = ieee80211_try_rate_control_ops_get(alg_name);
Jiri Bencf0706e82007-05-05 11:45:53 -0700114 if (!ops) {
Stefano Brivioc21b39a2007-12-19 01:26:16 +0100115 request_module("rc80211_%s", alg_name);
116 ops = ieee80211_try_rate_control_ops_get(alg_name);
Jiri Bencf0706e82007-05-05 11:45:53 -0700117 }
Stefano Brivioc21b39a2007-12-19 01:26:16 +0100118 if (!ops && name)
119 /* try default if specific alg requested but not found */
120 ops = ieee80211_try_rate_control_ops_get(ieee80211_default_rc_algo);
121
Johannes Berg4b475892008-01-02 15:17:03 +0100122 /* try built-in one if specific alg requested but not found */
123 if (!ops && strlen(CONFIG_MAC80211_RC_DEFAULT))
124 ops = ieee80211_try_rate_control_ops_get(CONFIG_MAC80211_RC_DEFAULT);
Rusty Russelld6d1b652010-08-11 23:04:27 -0600125 kparam_unblock_sysfs_write(ieee80211_default_rc_algo);
Johannes Berg4b475892008-01-02 15:17:03 +0100126
Jiri Bencf0706e82007-05-05 11:45:53 -0700127 return ops;
128}
129
130static void ieee80211_rate_control_ops_put(struct rate_control_ops *ops)
131{
132 module_put(ops->module);
133}
134
Johannes Berg4b7679a2008-09-18 18:14:18 +0200135#ifdef CONFIG_MAC80211_DEBUGFS
136static ssize_t rcname_read(struct file *file, char __user *userbuf,
137 size_t count, loff_t *ppos)
138{
139 struct rate_control_ref *ref = file->private_data;
140 int len = strlen(ref->ops->name);
141
142 return simple_read_from_buffer(userbuf, count, ppos,
143 ref->ops->name, len);
144}
145
146static const struct file_operations rcname_ops = {
147 .read = rcname_read,
Stephen Boyd234e3402012-04-05 14:25:11 -0700148 .open = simple_open,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200149 .llseek = default_llseek,
Johannes Berg4b7679a2008-09-18 18:14:18 +0200150};
151#endif
152
Andres Salomon209c6712010-02-07 21:47:50 -0500153static struct rate_control_ref *rate_control_alloc(const char *name,
Jiri Bencf0706e82007-05-05 11:45:53 -0700154 struct ieee80211_local *local)
155{
Johannes Berg4b7679a2008-09-18 18:14:18 +0200156 struct dentry *debugfsdir = NULL;
Jiri Bencf0706e82007-05-05 11:45:53 -0700157 struct rate_control_ref *ref;
158
159 ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL);
160 if (!ref)
161 goto fail_ref;
Johannes Berg4b7679a2008-09-18 18:14:18 +0200162 ref->local = local;
Jiri Bencf0706e82007-05-05 11:45:53 -0700163 ref->ops = ieee80211_rate_control_ops_get(name);
164 if (!ref->ops)
165 goto fail_ops;
Johannes Berg4b7679a2008-09-18 18:14:18 +0200166
167#ifdef CONFIG_MAC80211_DEBUGFS
168 debugfsdir = debugfs_create_dir("rc", local->hw.wiphy->debugfsdir);
169 local->debugfs.rcdir = debugfsdir;
Johannes Berg7bcfaf22009-10-27 12:59:03 +0100170 debugfs_create_file("name", 0400, debugfsdir, ref, &rcname_ops);
Johannes Berg4b7679a2008-09-18 18:14:18 +0200171#endif
172
173 ref->priv = ref->ops->alloc(&local->hw, debugfsdir);
Jiri Bencf0706e82007-05-05 11:45:53 -0700174 if (!ref->priv)
175 goto fail_priv;
176 return ref;
177
178fail_priv:
179 ieee80211_rate_control_ops_put(ref->ops);
180fail_ops:
181 kfree(ref);
182fail_ref:
183 return NULL;
184}
185
Johannes Berg889cbb92012-01-17 10:33:29 +0100186static void rate_control_free(struct rate_control_ref *ctrl_ref)
Jiri Bencf0706e82007-05-05 11:45:53 -0700187{
Jiri Bencf0706e82007-05-05 11:45:53 -0700188 ctrl_ref->ops->free(ctrl_ref->priv);
Johannes Berg4b7679a2008-09-18 18:14:18 +0200189
190#ifdef CONFIG_MAC80211_DEBUGFS
Johannes Berg7bcfaf22009-10-27 12:59:03 +0100191 debugfs_remove_recursive(ctrl_ref->local->debugfs.rcdir);
Johannes Berg4b7679a2008-09-18 18:14:18 +0200192 ctrl_ref->local->debugfs.rcdir = NULL;
193#endif
194
Jiri Bencf0706e82007-05-05 11:45:53 -0700195 ieee80211_rate_control_ops_put(ctrl_ref->ops);
196 kfree(ctrl_ref);
197}
198
Rajkumar Manoharanb6f35302011-09-29 20:34:04 +0530199static bool rc_no_data_or_no_ack_use_min(struct ieee80211_tx_rate_control *txrc)
Luis R. Rodriguez4c6d4f52009-07-16 10:05:41 -0700200{
201 struct sk_buff *skb = txrc->skb;
202 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
203 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
204 __le16 fc;
205
206 fc = hdr->frame_control;
207
Rajkumar Manoharanb6f35302011-09-29 20:34:04 +0530208 return (info->flags & (IEEE80211_TX_CTL_NO_ACK |
209 IEEE80211_TX_CTL_USE_MINRATE)) ||
210 !ieee80211_is_data(fc);
Luis R. Rodriguez4c6d4f52009-07-16 10:05:41 -0700211}
212
Felix Fietkaudd5b4cc2010-11-22 20:58:24 +0100213static void rc_send_low_broadcast(s8 *idx, u32 basic_rates,
Felix Fietkau8f0729b2010-11-11 15:07:23 +0100214 struct ieee80211_supported_band *sband)
Jouni Malinene00cfce2009-12-29 12:59:19 +0200215{
216 u8 i;
217
218 if (basic_rates == 0)
219 return; /* assume basic rates unknown and accept rate */
220 if (*idx < 0)
221 return;
222 if (basic_rates & (1 << *idx))
223 return; /* selected rate is a basic rate */
224
Felix Fietkau8f0729b2010-11-11 15:07:23 +0100225 for (i = *idx + 1; i <= sband->n_bitrates; i++) {
Jouni Malinene00cfce2009-12-29 12:59:19 +0200226 if (basic_rates & (1 << i)) {
227 *idx = i;
228 return;
229 }
230 }
231
232 /* could not find a basic rate; use original selection */
233}
234
Rajkumar Manoharanaad14ce2011-09-25 14:53:31 +0530235static inline s8
236rate_lowest_non_cck_index(struct ieee80211_supported_band *sband,
237 struct ieee80211_sta *sta)
238{
239 int i;
240
241 for (i = 0; i < sband->n_bitrates; i++) {
242 struct ieee80211_rate *srate = &sband->bitrates[i];
243 if ((srate->bitrate == 10) || (srate->bitrate == 20) ||
244 (srate->bitrate == 55) || (srate->bitrate == 110))
245 continue;
246
247 if (rate_supported(sta, sband->band, i))
248 return i;
249 }
250
251 /* No matching rate found */
252 return 0;
253}
254
255
Luis R. Rodriguez4c6d4f52009-07-16 10:05:41 -0700256bool rate_control_send_low(struct ieee80211_sta *sta,
257 void *priv_sta,
258 struct ieee80211_tx_rate_control *txrc)
259{
260 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
Felix Fietkaudd5b4cc2010-11-22 20:58:24 +0100261 struct ieee80211_supported_band *sband = txrc->sband;
262 int mcast_rate;
Luis R. Rodriguez4c6d4f52009-07-16 10:05:41 -0700263
Rajkumar Manoharanb6f35302011-09-29 20:34:04 +0530264 if (!sta || !priv_sta || rc_no_data_or_no_ack_use_min(txrc)) {
Rajkumar Manoharanaad14ce2011-09-25 14:53:31 +0530265 if ((sband->band != IEEE80211_BAND_2GHZ) ||
266 !(info->flags & IEEE80211_TX_CTL_NO_CCK_RATE))
267 info->control.rates[0].idx =
268 rate_lowest_index(txrc->sband, sta);
269 else
270 info->control.rates[0].idx =
271 rate_lowest_non_cck_index(txrc->sband, sta);
Luis R. Rodriguez4c6d4f52009-07-16 10:05:41 -0700272 info->control.rates[0].count =
273 (info->flags & IEEE80211_TX_CTL_NO_ACK) ?
274 1 : txrc->hw->max_rate_tries;
Felix Fietkaudd5b4cc2010-11-22 20:58:24 +0100275 if (!sta && txrc->bss) {
276 mcast_rate = txrc->bss_conf->mcast_rate[sband->band];
277 if (mcast_rate > 0) {
278 info->control.rates[0].idx = mcast_rate - 1;
279 return true;
280 }
281
Jouni Malinene00cfce2009-12-29 12:59:19 +0200282 rc_send_low_broadcast(&info->control.rates[0].idx,
283 txrc->bss_conf->basic_rates,
Felix Fietkaudd5b4cc2010-11-22 20:58:24 +0100284 sband);
285 }
Luis R. Rodriguez4c6d4f52009-07-16 10:05:41 -0700286 return true;
287 }
288 return false;
289}
290EXPORT_SYMBOL(rate_control_send_low);
291
Simon Wunderlich19468412012-01-28 17:25:33 +0100292static bool rate_idx_match_legacy_mask(struct ieee80211_tx_rate *rate,
293 int n_bitrates, u32 mask)
Jouni Malinen37eb0b12010-01-06 13:09:08 +0200294{
295 int j;
296
297 /* See whether the selected rate or anything below it is allowed. */
298 for (j = rate->idx; j >= 0; j--) {
299 if (mask & (1 << j)) {
300 /* Okay, found a suitable rate. Use it. */
301 rate->idx = j;
Simon Wunderlich19468412012-01-28 17:25:33 +0100302 return true;
Jouni Malinen37eb0b12010-01-06 13:09:08 +0200303 }
304 }
305
306 /* Try to find a higher rate that would be allowed */
307 for (j = rate->idx + 1; j < n_bitrates; j++) {
308 if (mask & (1 << j)) {
309 /* Okay, found a suitable rate. Use it. */
310 rate->idx = j;
Simon Wunderlich19468412012-01-28 17:25:33 +0100311 return true;
312 }
313 }
314 return false;
315}
316
317static bool rate_idx_match_mcs_mask(struct ieee80211_tx_rate *rate,
318 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN])
319{
320 int i, j;
321 int ridx, rbit;
322
323 ridx = rate->idx / 8;
324 rbit = rate->idx % 8;
325
326 /* sanity check */
Dan Carpenter910570b52012-02-01 10:42:11 +0300327 if (ridx < 0 || ridx >= IEEE80211_HT_MCS_MASK_LEN)
Simon Wunderlich19468412012-01-28 17:25:33 +0100328 return false;
329
330 /* See whether the selected rate or anything below it is allowed. */
331 for (i = ridx; i >= 0; i--) {
332 for (j = rbit; j >= 0; j--)
333 if (mcs_mask[i] & BIT(j)) {
334 rate->idx = i * 8 + j;
335 return true;
336 }
337 rbit = 7;
338 }
339
340 /* Try to find a higher rate that would be allowed */
341 ridx = (rate->idx + 1) / 8;
342 rbit = (rate->idx + 1) % 8;
343
344 for (i = ridx; i < IEEE80211_HT_MCS_MASK_LEN; i++) {
345 for (j = rbit; j < 8; j++)
346 if (mcs_mask[i] & BIT(j)) {
347 rate->idx = i * 8 + j;
348 return true;
349 }
350 rbit = 0;
351 }
352 return false;
353}
354
355
356
357static void rate_idx_match_mask(struct ieee80211_tx_rate *rate,
358 struct ieee80211_tx_rate_control *txrc,
359 u32 mask,
360 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN])
361{
362 struct ieee80211_tx_rate alt_rate;
363
364 /* handle HT rates */
365 if (rate->flags & IEEE80211_TX_RC_MCS) {
366 if (rate_idx_match_mcs_mask(rate, mcs_mask))
367 return;
368
369 /* also try the legacy rates. */
370 alt_rate.idx = 0;
371 /* keep protection flags */
372 alt_rate.flags = rate->flags &
373 (IEEE80211_TX_RC_USE_RTS_CTS |
374 IEEE80211_TX_RC_USE_CTS_PROTECT |
375 IEEE80211_TX_RC_USE_SHORT_PREAMBLE);
376 alt_rate.count = rate->count;
377 if (rate_idx_match_legacy_mask(&alt_rate,
378 txrc->sband->n_bitrates,
379 mask)) {
380 *rate = alt_rate;
381 return;
382 }
383 } else {
384 struct sk_buff *skb = txrc->skb;
385 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
386 __le16 fc;
387
388 /* handle legacy rates */
389 if (rate_idx_match_legacy_mask(rate, txrc->sband->n_bitrates,
390 mask))
391 return;
392
393 /* if HT BSS, and we handle a data frame, also try HT rates */
Johannes Berg4bf88532012-11-09 11:39:59 +0100394 if (txrc->bss_conf->chandef.width == NL80211_CHAN_WIDTH_20_NOHT)
Simon Wunderlich19468412012-01-28 17:25:33 +0100395 return;
396
397 fc = hdr->frame_control;
398 if (!ieee80211_is_data(fc))
399 return;
400
401 alt_rate.idx = 0;
402 /* keep protection flags */
403 alt_rate.flags = rate->flags &
404 (IEEE80211_TX_RC_USE_RTS_CTS |
405 IEEE80211_TX_RC_USE_CTS_PROTECT |
406 IEEE80211_TX_RC_USE_SHORT_PREAMBLE);
407 alt_rate.count = rate->count;
408
409 alt_rate.flags |= IEEE80211_TX_RC_MCS;
410
Johannes Berg4bf88532012-11-09 11:39:59 +0100411 if (txrc->bss_conf->chandef.width == NL80211_CHAN_WIDTH_40)
Simon Wunderlich19468412012-01-28 17:25:33 +0100412 alt_rate.flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
413
414 if (rate_idx_match_mcs_mask(&alt_rate, mcs_mask)) {
415 *rate = alt_rate;
Jouni Malinen37eb0b12010-01-06 13:09:08 +0200416 return;
417 }
418 }
419
420 /*
421 * Uh.. No suitable rate exists. This should not really happen with
422 * sane TX rate mask configurations. However, should someone manage to
423 * configure supported rates and TX rate mask in incompatible way,
424 * allow the frame to be transmitted with whatever the rate control
425 * selected.
426 */
427}
428
Johannes Berg4b7679a2008-09-18 18:14:18 +0200429void rate_control_get_rate(struct ieee80211_sub_if_data *sdata,
Johannes Berge6a98542008-10-21 12:40:02 +0200430 struct sta_info *sta,
431 struct ieee80211_tx_rate_control *txrc)
Mattias Nissler1abbe492007-12-20 13:50:07 +0100432{
Johannes Berg4b7679a2008-09-18 18:14:18 +0200433 struct rate_control_ref *ref = sdata->local->rate_ctrl;
434 void *priv_sta = NULL;
435 struct ieee80211_sta *ista = NULL;
Johannes Berge6a98542008-10-21 12:40:02 +0200436 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
Mattias Nissler1abbe492007-12-20 13:50:07 +0100437 int i;
Jouni Malinen37eb0b12010-01-06 13:09:08 +0200438 u32 mask;
Simon Wunderlich19468412012-01-28 17:25:33 +0100439 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN];
Mattias Nissler1abbe492007-12-20 13:50:07 +0100440
Johannes Berge1936e92012-01-20 13:55:23 +0100441 if (sta && test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) {
Johannes Berg4b7679a2008-09-18 18:14:18 +0200442 ista = &sta->sta;
443 priv_sta = sta->rate_ctrl_priv;
444 }
445
Johannes Berge6a98542008-10-21 12:40:02 +0200446 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
447 info->control.rates[i].idx = -1;
448 info->control.rates[i].flags = 0;
Mohammed Shafi Shajakhan8617b092012-02-20 10:05:31 +0530449 info->control.rates[i].count = 0;
Mattias Nissler1abbe492007-12-20 13:50:07 +0100450 }
Johannes Berge6a98542008-10-21 12:40:02 +0200451
Juuso Oikarinen5affcd62010-02-12 10:05:45 +0200452 if (sdata->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
453 return;
454
Jouni Malinen37eb0b12010-01-06 13:09:08 +0200455 ref->ops->get_rate(ref->priv, ista, priv_sta, txrc);
Johannes Berge6a98542008-10-21 12:40:02 +0200456
457 /*
Jouni Malinen37eb0b12010-01-06 13:09:08 +0200458 * Try to enforce the rateidx mask the user wanted. skip this if the
459 * default mask (allow all rates) is used to save some processing for
460 * the common case.
Johannes Berge6a98542008-10-21 12:40:02 +0200461 */
Jouni Malinen37eb0b12010-01-06 13:09:08 +0200462 mask = sdata->rc_rateidx_mask[info->band];
Simon Wunderlich19468412012-01-28 17:25:33 +0100463 memcpy(mcs_mask, sdata->rc_rateidx_mcs_mask[info->band],
464 sizeof(mcs_mask));
Jouni Malinen37eb0b12010-01-06 13:09:08 +0200465 if (mask != (1 << txrc->sband->n_bitrates) - 1) {
466 if (sta) {
467 /* Filter out rates that the STA does not support */
468 mask &= sta->sta.supp_rates[info->band];
Simon Wunderlich19468412012-01-28 17:25:33 +0100469 for (i = 0; i < sizeof(mcs_mask); i++)
470 mcs_mask[i] &= sta->sta.ht_cap.mcs.rx_mask[i];
Jouni Malinen37eb0b12010-01-06 13:09:08 +0200471 }
472 /*
473 * Make sure the rate index selected for each TX rate is
474 * included in the configured mask and change the rate indexes
475 * if needed.
476 */
Johannes Berge6a98542008-10-21 12:40:02 +0200477 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
Christian Lamparter5f4e6b22010-10-16 18:49:15 +0200478 /* Skip invalid rates */
479 if (info->control.rates[i].idx < 0)
480 break;
Simon Wunderlich19468412012-01-28 17:25:33 +0100481 rate_idx_match_mask(&info->control.rates[i], txrc,
482 mask, mcs_mask);
Jouni Malinen37eb0b12010-01-06 13:09:08 +0200483 }
Johannes Berge6a98542008-10-21 12:40:02 +0200484 }
485
486 BUG_ON(info->control.rates[0].idx < 0);
Mattias Nissler1abbe492007-12-20 13:50:07 +0100487}
488
Johannes Bergff688082007-07-27 15:43:23 +0200489int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local,
490 const char *name)
491{
Johannes Berg889cbb92012-01-17 10:33:29 +0100492 struct rate_control_ref *ref;
Johannes Bergff688082007-07-27 15:43:23 +0200493
494 ASSERT_RTNL();
Johannes Bergaf65cd962009-11-17 18:18:36 +0100495
Johannes Berg3b8d81e02009-06-17 17:43:56 +0200496 if (local->open_count)
Johannes Bergff688082007-07-27 15:43:23 +0200497 return -EBUSY;
498
Johannes Bergaf65cd962009-11-17 18:18:36 +0100499 if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) {
500 if (WARN_ON(!local->ops->set_rts_threshold))
501 return -EINVAL;
502 return 0;
503 }
504
Johannes Bergff688082007-07-27 15:43:23 +0200505 ref = rate_control_alloc(name, local);
506 if (!ref) {
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700507 wiphy_warn(local->hw.wiphy,
508 "Failed to select rate control algorithm\n");
Johannes Bergff688082007-07-27 15:43:23 +0200509 return -ENOENT;
510 }
511
Johannes Berg889cbb92012-01-17 10:33:29 +0100512 WARN_ON(local->rate_ctrl);
Johannes Bergff688082007-07-27 15:43:23 +0200513 local->rate_ctrl = ref;
Johannes Bergff688082007-07-27 15:43:23 +0200514
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700515 wiphy_debug(local->hw.wiphy, "Selected rate control algorithm '%s'\n",
516 ref->ops->name);
Johannes Bergff688082007-07-27 15:43:23 +0200517
Johannes Bergff688082007-07-27 15:43:23 +0200518 return 0;
519}
520
521void rate_control_deinitialize(struct ieee80211_local *local)
522{
523 struct rate_control_ref *ref;
524
525 ref = local->rate_ctrl;
Johannes Bergaf65cd962009-11-17 18:18:36 +0100526
527 if (!ref)
528 return;
529
Johannes Bergff688082007-07-27 15:43:23 +0200530 local->rate_ctrl = NULL;
Johannes Berg889cbb92012-01-17 10:33:29 +0100531 rate_control_free(ref);
Johannes Bergff688082007-07-27 15:43:23 +0200532}
Stefano Brivioc21b39a2007-12-19 01:26:16 +0100533