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Commit | Line | Data |
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f0706e82 JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | ||
11 | #include <linux/kernel.h> | |
ff688089 | 12 | #include <linux/rtnetlink.h> |
5a0e3ad6 | 13 | #include <linux/slab.h> |
3a9a231d | 14 | #include <linux/module.h> |
2c8dccc7 | 15 | #include "rate.h" |
f0706e82 | 16 | #include "ieee80211_i.h" |
4b7679a5 | 17 | #include "debugfs.h" |
f0706e82 JB |
18 | |
19 | struct rate_control_alg { | |
20 | struct list_head list; | |
21 | struct rate_control_ops *ops; | |
22 | }; | |
23 | ||
24 | static LIST_HEAD(rate_ctrl_algs); | |
25 | static DEFINE_MUTEX(rate_ctrl_mutex); | |
26 | ||
c21b39ac SB |
27 | static char *ieee80211_default_rc_algo = CONFIG_MAC80211_RC_DEFAULT; |
28 | module_param(ieee80211_default_rc_algo, charp, 0644); | |
29 | MODULE_PARM_DESC(ieee80211_default_rc_algo, | |
30 | "Default rate control algorithm for mac80211 to use"); | |
31 | ||
f0706e82 JB |
32 | int ieee80211_rate_control_register(struct rate_control_ops *ops) |
33 | { | |
34 | struct rate_control_alg *alg; | |
35 | ||
ac71c691 JB |
36 | if (!ops->name) |
37 | return -EINVAL; | |
38 | ||
999acd9c JB |
39 | 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); | |
b808ab16 | 44 | mutex_unlock(&rate_ctrl_mutex); |
999acd9c JB |
45 | return -EALREADY; |
46 | } | |
47 | } | |
48 | ||
dd00cc48 | 49 | alg = kzalloc(sizeof(*alg), GFP_KERNEL); |
f0706e82 | 50 | if (alg == NULL) { |
999acd9c | 51 | mutex_unlock(&rate_ctrl_mutex); |
f0706e82 JB |
52 | return -ENOMEM; |
53 | } | |
f0706e82 JB |
54 | alg->ops = ops; |
55 | ||
f0706e82 JB |
56 | list_add_tail(&alg->list, &rate_ctrl_algs); |
57 | mutex_unlock(&rate_ctrl_mutex); | |
58 | ||
59 | return 0; | |
60 | } | |
61 | EXPORT_SYMBOL(ieee80211_rate_control_register); | |
62 | ||
63 | void 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); | |
20880e89 | 71 | kfree(alg); |
f0706e82 JB |
72 | break; |
73 | } | |
74 | } | |
75 | mutex_unlock(&rate_ctrl_mutex); | |
f0706e82 JB |
76 | } |
77 | EXPORT_SYMBOL(ieee80211_rate_control_unregister); | |
78 | ||
79 | static struct rate_control_ops * | |
80 | ieee80211_try_rate_control_ops_get(const char *name) | |
81 | { | |
82 | struct rate_control_alg *alg; | |
83 | struct rate_control_ops *ops = NULL; | |
84 | ||
ac71c691 JB |
85 | if (!name) |
86 | return NULL; | |
87 | ||
f0706e82 JB |
88 | mutex_lock(&rate_ctrl_mutex); |
89 | list_for_each_entry(alg, &rate_ctrl_algs, list) { | |
ac71c691 | 90 | if (!strcmp(alg->ops->name, name)) |
f0706e82 JB |
91 | 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 | ||
c21b39ac | 100 | /* Get the rate control algorithm. */ |
f0706e82 JB |
101 | static struct rate_control_ops * |
102 | ieee80211_rate_control_ops_get(const char *name) | |
103 | { | |
104 | struct rate_control_ops *ops; | |
c21b39ac | 105 | const char *alg_name; |
f0706e82 | 106 | |
d6d1b650 | 107 | kparam_block_sysfs_write(ieee80211_default_rc_algo); |
ac71c691 | 108 | if (!name) |
c21b39ac SB |
109 | alg_name = ieee80211_default_rc_algo; |
110 | else | |
111 | alg_name = name; | |
ac71c691 | 112 | |
c21b39ac | 113 | ops = ieee80211_try_rate_control_ops_get(alg_name); |
f0706e82 | 114 | if (!ops) { |
c21b39ac SB |
115 | request_module("rc80211_%s", alg_name); |
116 | ops = ieee80211_try_rate_control_ops_get(alg_name); | |
f0706e82 | 117 | } |
c21b39ac SB |
118 | 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 | ||
4b475898 JB |
122 | /* 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); | |
d6d1b650 | 125 | kparam_unblock_sysfs_write(ieee80211_default_rc_algo); |
4b475898 | 126 | |
f0706e82 JB |
127 | return ops; |
128 | } | |
129 | ||
130 | static void ieee80211_rate_control_ops_put(struct rate_control_ops *ops) | |
131 | { | |
132 | module_put(ops->module); | |
133 | } | |
134 | ||
4b7679a5 JB |
135 | #ifdef CONFIG_MAC80211_DEBUGFS |
136 | static 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 | ||
146 | static const struct file_operations rcname_ops = { | |
147 | .read = rcname_read, | |
234e3405 | 148 | .open = simple_open, |
6038f373 | 149 | .llseek = default_llseek, |
4b7679a5 JB |
150 | }; |
151 | #endif | |
152 | ||
209c671d | 153 | static struct rate_control_ref *rate_control_alloc(const char *name, |
f0706e82 JB |
154 | struct ieee80211_local *local) |
155 | { | |
4b7679a5 | 156 | struct dentry *debugfsdir = NULL; |
f0706e82 JB |
157 | struct rate_control_ref *ref; |
158 | ||
159 | ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL); | |
160 | if (!ref) | |
161 | goto fail_ref; | |
4b7679a5 | 162 | ref->local = local; |
f0706e82 JB |
163 | ref->ops = ieee80211_rate_control_ops_get(name); |
164 | if (!ref->ops) | |
165 | goto fail_ops; | |
4b7679a5 JB |
166 | |
167 | #ifdef CONFIG_MAC80211_DEBUGFS | |
168 | debugfsdir = debugfs_create_dir("rc", local->hw.wiphy->debugfsdir); | |
169 | local->debugfs.rcdir = debugfsdir; | |
7bcfaf2f | 170 | debugfs_create_file("name", 0400, debugfsdir, ref, &rcname_ops); |
4b7679a5 JB |
171 | #endif |
172 | ||
173 | ref->priv = ref->ops->alloc(&local->hw, debugfsdir); | |
f0706e82 JB |
174 | if (!ref->priv) |
175 | goto fail_priv; | |
176 | return ref; | |
177 | ||
178 | fail_priv: | |
179 | ieee80211_rate_control_ops_put(ref->ops); | |
180 | fail_ops: | |
181 | kfree(ref); | |
182 | fail_ref: | |
183 | return NULL; | |
184 | } | |
185 | ||
889cbb91 | 186 | static void rate_control_free(struct rate_control_ref *ctrl_ref) |
f0706e82 | 187 | { |
f0706e82 | 188 | ctrl_ref->ops->free(ctrl_ref->priv); |
4b7679a5 JB |
189 | |
190 | #ifdef CONFIG_MAC80211_DEBUGFS | |
7bcfaf2f | 191 | debugfs_remove_recursive(ctrl_ref->local->debugfs.rcdir); |
4b7679a5 JB |
192 | ctrl_ref->local->debugfs.rcdir = NULL; |
193 | #endif | |
194 | ||
f0706e82 JB |
195 | ieee80211_rate_control_ops_put(ctrl_ref->ops); |
196 | kfree(ctrl_ref); | |
197 | } | |
198 | ||
b6f35301 | 199 | static bool rc_no_data_or_no_ack_use_min(struct ieee80211_tx_rate_control *txrc) |
4c6d4f5c LR |
200 | { |
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 | ||
b6f35301 RM |
208 | return (info->flags & (IEEE80211_TX_CTL_NO_ACK | |
209 | IEEE80211_TX_CTL_USE_MINRATE)) || | |
210 | !ieee80211_is_data(fc); | |
4c6d4f5c LR |
211 | } |
212 | ||
06703079 | 213 | static void rc_send_low_basicrate(s8 *idx, u32 basic_rates, |
8f0729b1 | 214 | struct ieee80211_supported_band *sband) |
e00cfce0 JM |
215 | { |
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 | ||
8f0729b1 | 225 | for (i = *idx + 1; i <= sband->n_bitrates; i++) { |
e00cfce0 JM |
226 | 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 | ||
2103dec1 SW |
235 | static void __rate_control_send_low(struct ieee80211_hw *hw, |
236 | struct ieee80211_supported_band *sband, | |
237 | struct ieee80211_sta *sta, | |
1d2d350b AO |
238 | struct ieee80211_tx_info *info, |
239 | u32 rate_mask) | |
aad14ceb RM |
240 | { |
241 | int i; | |
2103dec1 SW |
242 | u32 rate_flags = |
243 | ieee80211_chandef_rate_flags(&hw->conf.chandef); | |
aad14ceb | 244 | |
2103dec1 SW |
245 | if ((sband->band == IEEE80211_BAND_2GHZ) && |
246 | (info->flags & IEEE80211_TX_CTL_NO_CCK_RATE)) | |
247 | rate_flags |= IEEE80211_RATE_ERP_G; | |
248 | ||
249 | info->control.rates[0].idx = 0; | |
aad14ceb | 250 | for (i = 0; i < sband->n_bitrates; i++) { |
1d2d350b AO |
251 | if (!(rate_mask & BIT(i))) |
252 | continue; | |
253 | ||
1431fcb7 AO |
254 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) |
255 | continue; | |
256 | ||
2103dec1 | 257 | if (!rate_supported(sta, sband->band, i)) |
aad14ceb RM |
258 | continue; |
259 | ||
2103dec1 SW |
260 | info->control.rates[0].idx = i; |
261 | break; | |
aad14ceb | 262 | } |
2103dec1 | 263 | WARN_ON_ONCE(i == sband->n_bitrates); |
0d528d85 FF |
264 | |
265 | info->control.rates[0].count = | |
266 | (info->flags & IEEE80211_TX_CTL_NO_ACK) ? | |
267 | 1 : hw->max_rate_tries; | |
268 | ||
269 | info->control.skip_table = 1; | |
270 | } | |
271 | ||
aad14ceb | 272 | |
06703079 | 273 | bool rate_control_send_low(struct ieee80211_sta *pubsta, |
4c6d4f5c LR |
274 | void *priv_sta, |
275 | struct ieee80211_tx_rate_control *txrc) | |
276 | { | |
277 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); | |
dd5b4cc7 | 278 | struct ieee80211_supported_band *sband = txrc->sband; |
06703079 | 279 | struct sta_info *sta; |
dd5b4cc7 | 280 | int mcast_rate; |
06703079 | 281 | bool use_basicrate = false; |
4c6d4f5c | 282 | |
06703079 | 283 | if (!pubsta || !priv_sta || rc_no_data_or_no_ack_use_min(txrc)) { |
1d2d350b AO |
284 | __rate_control_send_low(txrc->hw, sband, pubsta, info, |
285 | txrc->rate_idx_mask); | |
0d528d85 | 286 | |
06703079 | 287 | if (!pubsta && txrc->bss) { |
dd5b4cc7 FF |
288 | mcast_rate = txrc->bss_conf->mcast_rate[sband->band]; |
289 | if (mcast_rate > 0) { | |
290 | info->control.rates[0].idx = mcast_rate - 1; | |
291 | return true; | |
292 | } | |
06703079 CYY |
293 | use_basicrate = true; |
294 | } else if (pubsta) { | |
295 | sta = container_of(pubsta, struct sta_info, sta); | |
296 | if (ieee80211_vif_is_mesh(&sta->sdata->vif)) | |
297 | use_basicrate = true; | |
298 | } | |
dd5b4cc7 | 299 | |
06703079 CYY |
300 | if (use_basicrate) |
301 | rc_send_low_basicrate(&info->control.rates[0].idx, | |
e00cfce0 | 302 | txrc->bss_conf->basic_rates, |
dd5b4cc7 | 303 | sband); |
06703079 | 304 | |
4c6d4f5c LR |
305 | return true; |
306 | } | |
307 | return false; | |
308 | } | |
309 | EXPORT_SYMBOL(rate_control_send_low); | |
310 | ||
19468413 SW |
311 | static bool rate_idx_match_legacy_mask(struct ieee80211_tx_rate *rate, |
312 | int n_bitrates, u32 mask) | |
37eb0b16 JM |
313 | { |
314 | int j; | |
315 | ||
316 | /* See whether the selected rate or anything below it is allowed. */ | |
317 | for (j = rate->idx; j >= 0; j--) { | |
318 | if (mask & (1 << j)) { | |
319 | /* Okay, found a suitable rate. Use it. */ | |
320 | rate->idx = j; | |
19468413 | 321 | return true; |
37eb0b16 JM |
322 | } |
323 | } | |
324 | ||
325 | /* Try to find a higher rate that would be allowed */ | |
326 | for (j = rate->idx + 1; j < n_bitrates; j++) { | |
327 | if (mask & (1 << j)) { | |
328 | /* Okay, found a suitable rate. Use it. */ | |
329 | rate->idx = j; | |
19468413 SW |
330 | return true; |
331 | } | |
332 | } | |
333 | return false; | |
334 | } | |
335 | ||
336 | static bool rate_idx_match_mcs_mask(struct ieee80211_tx_rate *rate, | |
337 | u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN]) | |
338 | { | |
339 | int i, j; | |
340 | int ridx, rbit; | |
341 | ||
342 | ridx = rate->idx / 8; | |
343 | rbit = rate->idx % 8; | |
344 | ||
345 | /* sanity check */ | |
910570b5 | 346 | if (ridx < 0 || ridx >= IEEE80211_HT_MCS_MASK_LEN) |
19468413 SW |
347 | return false; |
348 | ||
349 | /* See whether the selected rate or anything below it is allowed. */ | |
350 | for (i = ridx; i >= 0; i--) { | |
351 | for (j = rbit; j >= 0; j--) | |
352 | if (mcs_mask[i] & BIT(j)) { | |
353 | rate->idx = i * 8 + j; | |
354 | return true; | |
355 | } | |
356 | rbit = 7; | |
357 | } | |
358 | ||
359 | /* Try to find a higher rate that would be allowed */ | |
360 | ridx = (rate->idx + 1) / 8; | |
361 | rbit = (rate->idx + 1) % 8; | |
362 | ||
363 | for (i = ridx; i < IEEE80211_HT_MCS_MASK_LEN; i++) { | |
364 | for (j = rbit; j < 8; j++) | |
365 | if (mcs_mask[i] & BIT(j)) { | |
366 | rate->idx = i * 8 + j; | |
367 | return true; | |
368 | } | |
369 | rbit = 0; | |
370 | } | |
371 | return false; | |
372 | } | |
373 | ||
374 | ||
375 | ||
376 | static void rate_idx_match_mask(struct ieee80211_tx_rate *rate, | |
0d528d85 FF |
377 | struct ieee80211_supported_band *sband, |
378 | enum nl80211_chan_width chan_width, | |
19468413 SW |
379 | u32 mask, |
380 | u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN]) | |
381 | { | |
382 | struct ieee80211_tx_rate alt_rate; | |
383 | ||
384 | /* handle HT rates */ | |
385 | if (rate->flags & IEEE80211_TX_RC_MCS) { | |
386 | if (rate_idx_match_mcs_mask(rate, mcs_mask)) | |
387 | return; | |
388 | ||
389 | /* also try the legacy rates. */ | |
390 | alt_rate.idx = 0; | |
391 | /* keep protection flags */ | |
392 | alt_rate.flags = rate->flags & | |
393 | (IEEE80211_TX_RC_USE_RTS_CTS | | |
394 | IEEE80211_TX_RC_USE_CTS_PROTECT | | |
395 | IEEE80211_TX_RC_USE_SHORT_PREAMBLE); | |
396 | alt_rate.count = rate->count; | |
397 | if (rate_idx_match_legacy_mask(&alt_rate, | |
0d528d85 | 398 | sband->n_bitrates, mask)) { |
19468413 SW |
399 | *rate = alt_rate; |
400 | return; | |
401 | } | |
402 | } else { | |
19468413 | 403 | /* handle legacy rates */ |
0d528d85 | 404 | if (rate_idx_match_legacy_mask(rate, sband->n_bitrates, mask)) |
19468413 SW |
405 | return; |
406 | ||
407 | /* if HT BSS, and we handle a data frame, also try HT rates */ | |
0418a445 SW |
408 | switch (chan_width) { |
409 | case NL80211_CHAN_WIDTH_20_NOHT: | |
410 | case NL80211_CHAN_WIDTH_5: | |
411 | case NL80211_CHAN_WIDTH_10: | |
19468413 | 412 | return; |
0418a445 SW |
413 | default: |
414 | break; | |
415 | } | |
19468413 SW |
416 | |
417 | alt_rate.idx = 0; | |
418 | /* keep protection flags */ | |
419 | alt_rate.flags = rate->flags & | |
420 | (IEEE80211_TX_RC_USE_RTS_CTS | | |
421 | IEEE80211_TX_RC_USE_CTS_PROTECT | | |
422 | IEEE80211_TX_RC_USE_SHORT_PREAMBLE); | |
423 | alt_rate.count = rate->count; | |
424 | ||
425 | alt_rate.flags |= IEEE80211_TX_RC_MCS; | |
426 | ||
0d528d85 | 427 | if (chan_width == NL80211_CHAN_WIDTH_40) |
19468413 SW |
428 | alt_rate.flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; |
429 | ||
430 | if (rate_idx_match_mcs_mask(&alt_rate, mcs_mask)) { | |
431 | *rate = alt_rate; | |
37eb0b16 JM |
432 | return; |
433 | } | |
434 | } | |
435 | ||
436 | /* | |
437 | * Uh.. No suitable rate exists. This should not really happen with | |
438 | * sane TX rate mask configurations. However, should someone manage to | |
439 | * configure supported rates and TX rate mask in incompatible way, | |
440 | * allow the frame to be transmitted with whatever the rate control | |
441 | * selected. | |
442 | */ | |
443 | } | |
444 | ||
0d528d85 FF |
445 | static void rate_fixup_ratelist(struct ieee80211_vif *vif, |
446 | struct ieee80211_supported_band *sband, | |
447 | struct ieee80211_tx_info *info, | |
448 | struct ieee80211_tx_rate *rates, | |
449 | int max_rates) | |
450 | { | |
451 | struct ieee80211_rate *rate; | |
452 | bool inval = false; | |
453 | int i; | |
454 | ||
455 | /* | |
456 | * Set up the RTS/CTS rate as the fastest basic rate | |
457 | * that is not faster than the data rate unless there | |
458 | * is no basic rate slower than the data rate, in which | |
459 | * case we pick the slowest basic rate | |
460 | * | |
461 | * XXX: Should this check all retry rates? | |
462 | */ | |
463 | if (!(rates[0].flags & IEEE80211_TX_RC_MCS)) { | |
464 | u32 basic_rates = vif->bss_conf.basic_rates; | |
465 | s8 baserate = basic_rates ? ffs(basic_rates - 1) : 0; | |
466 | ||
467 | rate = &sband->bitrates[rates[0].idx]; | |
468 | ||
469 | for (i = 0; i < sband->n_bitrates; i++) { | |
470 | /* must be a basic rate */ | |
471 | if (!(basic_rates & BIT(i))) | |
472 | continue; | |
473 | /* must not be faster than the data rate */ | |
474 | if (sband->bitrates[i].bitrate > rate->bitrate) | |
475 | continue; | |
476 | /* maximum */ | |
477 | if (sband->bitrates[baserate].bitrate < | |
478 | sband->bitrates[i].bitrate) | |
479 | baserate = i; | |
480 | } | |
481 | ||
482 | info->control.rts_cts_rate_idx = baserate; | |
483 | } | |
484 | ||
485 | for (i = 0; i < max_rates; i++) { | |
486 | /* | |
487 | * make sure there's no valid rate following | |
488 | * an invalid one, just in case drivers don't | |
489 | * take the API seriously to stop at -1. | |
490 | */ | |
491 | if (inval) { | |
492 | rates[i].idx = -1; | |
493 | continue; | |
494 | } | |
495 | if (rates[i].idx < 0) { | |
496 | inval = true; | |
497 | continue; | |
498 | } | |
499 | ||
500 | /* | |
501 | * For now assume MCS is already set up correctly, this | |
502 | * needs to be fixed. | |
503 | */ | |
504 | if (rates[i].flags & IEEE80211_TX_RC_MCS) { | |
505 | WARN_ON(rates[i].idx > 76); | |
506 | ||
507 | if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) && | |
508 | info->control.use_cts_prot) | |
509 | rates[i].flags |= | |
510 | IEEE80211_TX_RC_USE_CTS_PROTECT; | |
511 | continue; | |
512 | } | |
513 | ||
514 | if (rates[i].flags & IEEE80211_TX_RC_VHT_MCS) { | |
515 | WARN_ON(ieee80211_rate_get_vht_mcs(&rates[i]) > 9); | |
516 | continue; | |
517 | } | |
518 | ||
519 | /* set up RTS protection if desired */ | |
520 | if (info->control.use_rts) { | |
521 | rates[i].flags |= IEEE80211_TX_RC_USE_RTS_CTS; | |
522 | info->control.use_cts_prot = false; | |
523 | } | |
524 | ||
525 | /* RC is busted */ | |
526 | if (WARN_ON_ONCE(rates[i].idx >= sband->n_bitrates)) { | |
527 | rates[i].idx = -1; | |
528 | continue; | |
529 | } | |
530 | ||
531 | rate = &sband->bitrates[rates[i].idx]; | |
532 | ||
533 | /* set up short preamble */ | |
534 | if (info->control.short_preamble && | |
535 | rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) | |
536 | rates[i].flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE; | |
537 | ||
538 | /* set up G protection */ | |
539 | if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) && | |
540 | info->control.use_cts_prot && | |
541 | rate->flags & IEEE80211_RATE_ERP_G) | |
542 | rates[i].flags |= IEEE80211_TX_RC_USE_CTS_PROTECT; | |
543 | } | |
544 | } | |
545 | ||
546 | ||
547 | static void rate_control_fill_sta_table(struct ieee80211_sta *sta, | |
548 | struct ieee80211_tx_info *info, | |
549 | struct ieee80211_tx_rate *rates, | |
550 | int max_rates) | |
551 | { | |
552 | struct ieee80211_sta_rates *ratetbl = NULL; | |
553 | int i; | |
554 | ||
555 | if (sta && !info->control.skip_table) | |
556 | ratetbl = rcu_dereference(sta->rates); | |
557 | ||
558 | /* Fill remaining rate slots with data from the sta rate table. */ | |
559 | max_rates = min_t(int, max_rates, IEEE80211_TX_RATE_TABLE_SIZE); | |
560 | for (i = 0; i < max_rates; i++) { | |
561 | if (i < ARRAY_SIZE(info->control.rates) && | |
562 | info->control.rates[i].idx >= 0 && | |
563 | info->control.rates[i].count) { | |
564 | if (rates != info->control.rates) | |
565 | rates[i] = info->control.rates[i]; | |
566 | } else if (ratetbl) { | |
567 | rates[i].idx = ratetbl->rate[i].idx; | |
568 | rates[i].flags = ratetbl->rate[i].flags; | |
569 | if (info->control.use_rts) | |
570 | rates[i].count = ratetbl->rate[i].count_rts; | |
571 | else if (info->control.use_cts_prot) | |
572 | rates[i].count = ratetbl->rate[i].count_cts; | |
573 | else | |
574 | rates[i].count = ratetbl->rate[i].count; | |
575 | } else { | |
576 | rates[i].idx = -1; | |
577 | rates[i].count = 0; | |
578 | } | |
579 | ||
580 | if (rates[i].idx < 0 || !rates[i].count) | |
581 | break; | |
582 | } | |
583 | } | |
584 | ||
585 | static void rate_control_apply_mask(struct ieee80211_sub_if_data *sdata, | |
586 | struct ieee80211_sta *sta, | |
587 | struct ieee80211_supported_band *sband, | |
588 | struct ieee80211_tx_info *info, | |
589 | struct ieee80211_tx_rate *rates, | |
590 | int max_rates) | |
591 | { | |
592 | enum nl80211_chan_width chan_width; | |
593 | u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN]; | |
594 | bool has_mcs_mask; | |
595 | u32 mask; | |
2103dec1 | 596 | u32 rate_flags; |
0d528d85 FF |
597 | int i; |
598 | ||
599 | /* | |
600 | * Try to enforce the rateidx mask the user wanted. skip this if the | |
601 | * default mask (allow all rates) is used to save some processing for | |
602 | * the common case. | |
603 | */ | |
604 | mask = sdata->rc_rateidx_mask[info->band]; | |
605 | has_mcs_mask = sdata->rc_has_mcs_mask[info->band]; | |
2103dec1 SW |
606 | rate_flags = |
607 | ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef); | |
608 | for (i = 0; i < sband->n_bitrates; i++) | |
609 | if ((rate_flags & sband->bitrates[i].flags) != rate_flags) | |
610 | mask &= ~BIT(i); | |
611 | ||
0d528d85 FF |
612 | if (mask == (1 << sband->n_bitrates) - 1 && !has_mcs_mask) |
613 | return; | |
614 | ||
615 | if (has_mcs_mask) | |
616 | memcpy(mcs_mask, sdata->rc_rateidx_mcs_mask[info->band], | |
617 | sizeof(mcs_mask)); | |
618 | else | |
619 | memset(mcs_mask, 0xff, sizeof(mcs_mask)); | |
620 | ||
621 | if (sta) { | |
622 | /* Filter out rates that the STA does not support */ | |
623 | mask &= sta->supp_rates[info->band]; | |
624 | for (i = 0; i < sizeof(mcs_mask); i++) | |
625 | mcs_mask[i] &= sta->ht_cap.mcs.rx_mask[i]; | |
626 | } | |
627 | ||
628 | /* | |
629 | * Make sure the rate index selected for each TX rate is | |
630 | * included in the configured mask and change the rate indexes | |
631 | * if needed. | |
632 | */ | |
633 | chan_width = sdata->vif.bss_conf.chandef.width; | |
634 | for (i = 0; i < max_rates; i++) { | |
635 | /* Skip invalid rates */ | |
636 | if (rates[i].idx < 0) | |
637 | break; | |
638 | ||
795d855d | 639 | rate_idx_match_mask(&rates[i], sband, chan_width, mask, |
0d528d85 FF |
640 | mcs_mask); |
641 | } | |
642 | } | |
643 | ||
644 | void ieee80211_get_tx_rates(struct ieee80211_vif *vif, | |
645 | struct ieee80211_sta *sta, | |
646 | struct sk_buff *skb, | |
647 | struct ieee80211_tx_rate *dest, | |
648 | int max_rates) | |
649 | { | |
650 | struct ieee80211_sub_if_data *sdata; | |
651 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
652 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
653 | struct ieee80211_supported_band *sband; | |
654 | ||
655 | rate_control_fill_sta_table(sta, info, dest, max_rates); | |
656 | ||
657 | if (!vif) | |
658 | return; | |
659 | ||
660 | sdata = vif_to_sdata(vif); | |
661 | sband = sdata->local->hw.wiphy->bands[info->band]; | |
662 | ||
663 | if (ieee80211_is_data(hdr->frame_control)) | |
664 | rate_control_apply_mask(sdata, sta, sband, info, dest, max_rates); | |
665 | ||
666 | if (dest[0].idx < 0) | |
1d2d350b AO |
667 | __rate_control_send_low(&sdata->local->hw, sband, sta, info, |
668 | sdata->rc_rateidx_mask[info->band]); | |
0d528d85 FF |
669 | |
670 | if (sta) | |
671 | rate_fixup_ratelist(vif, sband, info, dest, max_rates); | |
672 | } | |
673 | EXPORT_SYMBOL(ieee80211_get_tx_rates); | |
674 | ||
4b7679a5 | 675 | void rate_control_get_rate(struct ieee80211_sub_if_data *sdata, |
e6a9854b JB |
676 | struct sta_info *sta, |
677 | struct ieee80211_tx_rate_control *txrc) | |
1abbe498 | 678 | { |
4b7679a5 JB |
679 | struct rate_control_ref *ref = sdata->local->rate_ctrl; |
680 | void *priv_sta = NULL; | |
681 | struct ieee80211_sta *ista = NULL; | |
e6a9854b | 682 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); |
1abbe498 | 683 | int i; |
1abbe498 | 684 | |
e1936e94 | 685 | if (sta && test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) { |
4b7679a5 JB |
686 | ista = &sta->sta; |
687 | priv_sta = sta->rate_ctrl_priv; | |
688 | } | |
689 | ||
e6a9854b JB |
690 | for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { |
691 | info->control.rates[i].idx = -1; | |
692 | info->control.rates[i].flags = 0; | |
8617b093 | 693 | info->control.rates[i].count = 0; |
e6a9854b JB |
694 | } |
695 | ||
5affcd6b JO |
696 | if (sdata->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) |
697 | return; | |
698 | ||
37eb0b16 | 699 | ref->ops->get_rate(ref->priv, ista, priv_sta, txrc); |
e6a9854b | 700 | |
0d528d85 FF |
701 | if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_RC_TABLE) |
702 | return; | |
703 | ||
704 | ieee80211_get_tx_rates(&sdata->vif, ista, txrc->skb, | |
705 | info->control.rates, | |
706 | ARRAY_SIZE(info->control.rates)); | |
707 | } | |
e6a9854b | 708 | |
0d528d85 FF |
709 | int rate_control_set_rates(struct ieee80211_hw *hw, |
710 | struct ieee80211_sta *pubsta, | |
711 | struct ieee80211_sta_rates *rates) | |
712 | { | |
f6b3d85f | 713 | struct ieee80211_sta_rates *old; |
0d528d85 | 714 | |
f6b3d85f FF |
715 | /* |
716 | * mac80211 guarantees that this function will not be called | |
717 | * concurrently, so the following RCU access is safe, even without | |
718 | * extra locking. This can not be checked easily, so we just set | |
719 | * the condition to true. | |
720 | */ | |
721 | old = rcu_dereference_protected(pubsta->rates, true); | |
0d528d85 FF |
722 | rcu_assign_pointer(pubsta->rates, rates); |
723 | if (old) | |
724 | kfree_rcu(old, rcu_head); | |
725 | ||
726 | return 0; | |
1abbe498 | 727 | } |
0d528d85 | 728 | EXPORT_SYMBOL(rate_control_set_rates); |
1abbe498 | 729 | |
ff688089 JB |
730 | int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local, |
731 | const char *name) | |
732 | { | |
889cbb91 | 733 | struct rate_control_ref *ref; |
ff688089 JB |
734 | |
735 | ASSERT_RTNL(); | |
af65cd96 | 736 | |
3b8d81e0 | 737 | if (local->open_count) |
ff688089 JB |
738 | return -EBUSY; |
739 | ||
af65cd96 JB |
740 | if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) { |
741 | if (WARN_ON(!local->ops->set_rts_threshold)) | |
742 | return -EINVAL; | |
743 | return 0; | |
744 | } | |
745 | ||
ff688089 JB |
746 | ref = rate_control_alloc(name, local); |
747 | if (!ref) { | |
0fb9a9ec JP |
748 | wiphy_warn(local->hw.wiphy, |
749 | "Failed to select rate control algorithm\n"); | |
ff688089 JB |
750 | return -ENOENT; |
751 | } | |
752 | ||
889cbb91 | 753 | WARN_ON(local->rate_ctrl); |
ff688089 | 754 | local->rate_ctrl = ref; |
ff688089 | 755 | |
0fb9a9ec JP |
756 | wiphy_debug(local->hw.wiphy, "Selected rate control algorithm '%s'\n", |
757 | ref->ops->name); | |
ff688089 | 758 | |
ff688089 JB |
759 | return 0; |
760 | } | |
761 | ||
762 | void rate_control_deinitialize(struct ieee80211_local *local) | |
763 | { | |
764 | struct rate_control_ref *ref; | |
765 | ||
766 | ref = local->rate_ctrl; | |
af65cd96 JB |
767 | |
768 | if (!ref) | |
769 | return; | |
770 | ||
ff688089 | 771 | local->rate_ctrl = NULL; |
889cbb91 | 772 | rate_control_free(ref); |
ff688089 | 773 | } |
c21b39ac | 774 |