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1 From: Felix Fietkau <nbd@nbd.name>
2 Date: Sat, 10 Feb 2018 12:43:30 +0100
3 Subject: [PATCH] mac80211: minstrel: merge with minstrel_ht, always enable
4 VHT support
5
6 Legacy-only devices are not very common and the overhead of the extra
7 code for HT and VHT rates is not big enough to justify all those extra
8 lines of code to make it optional.
9
10 Signed-off-by: Felix Fietkau <nbd@nbd.name>
11 ---
12
13 --- a/net/mac80211/Kconfig
14 +++ b/net/mac80211/Kconfig
15 @@ -25,20 +25,6 @@ config MAC80211_RC_MINSTREL
16 ---help---
17 This option enables the 'minstrel' TX rate control algorithm
18
19 -config MAC80211_RC_MINSTREL_HT
20 - bool "Minstrel 802.11n support" if EXPERT
21 - depends on MAC80211_RC_MINSTREL
22 - default y
23 - ---help---
24 - This option enables the 'minstrel_ht' TX rate control algorithm
25 -
26 -config MAC80211_RC_MINSTREL_VHT
27 - bool "Minstrel 802.11ac support" if EXPERT
28 - depends on MAC80211_RC_MINSTREL_HT
29 - default n
30 - ---help---
31 - This option enables VHT in the 'minstrel_ht' TX rate control algorithm
32 -
33 choice
34 prompt "Default rate control algorithm"
35 depends on MAC80211_HAS_RC
36 @@ -60,8 +46,7 @@ endchoice
37
38 config MAC80211_RC_DEFAULT
39 string
40 - default "minstrel_ht" if MAC80211_RC_DEFAULT_MINSTREL && MAC80211_RC_MINSTREL_HT
41 - default "minstrel" if MAC80211_RC_DEFAULT_MINSTREL
42 + default "minstrel_ht" if MAC80211_RC_DEFAULT_MINSTREL
43 default ""
44
45 endif
46 --- a/net/mac80211/Makefile
47 +++ b/net/mac80211/Makefile
48 @@ -52,13 +52,14 @@ mac80211-$(CONFIG_PM) += pm.o
49
50 CFLAGS_trace.o := -I$(src)
51
52 -rc80211_minstrel-y := rc80211_minstrel.o
53 -rc80211_minstrel-$(CPTCFG_MAC80211_DEBUGFS) += rc80211_minstrel_debugfs.o
54 +rc80211_minstrel-y := \
55 + rc80211_minstrel.o \
56 + rc80211_minstrel_ht.o
57
58 -rc80211_minstrel_ht-y := rc80211_minstrel_ht.o
59 -rc80211_minstrel_ht-$(CPTCFG_MAC80211_DEBUGFS) += rc80211_minstrel_ht_debugfs.o
60 +rc80211_minstrel-$(CPTCFG_MAC80211_DEBUGFS) += \
61 + rc80211_minstrel_debugfs.o \
62 + rc80211_minstrel_ht_debugfs.o
63
64 mac80211-$(CPTCFG_MAC80211_RC_MINSTREL) += $(rc80211_minstrel-y)
65 -mac80211-$(CPTCFG_MAC80211_RC_MINSTREL_HT) += $(rc80211_minstrel_ht-y)
66
67 ccflags-y += -DDEBUG
68 --- a/net/mac80211/main.c
69 +++ b/net/mac80211/main.c
70 @@ -1308,18 +1308,12 @@ static int __init ieee80211_init(void)
71 if (ret)
72 return ret;
73
74 - ret = rc80211_minstrel_ht_init();
75 - if (ret)
76 - goto err_minstrel;
77 -
78 ret = ieee80211_iface_init();
79 if (ret)
80 goto err_netdev;
81
82 return 0;
83 err_netdev:
84 - rc80211_minstrel_ht_exit();
85 - err_minstrel:
86 rc80211_minstrel_exit();
87
88 return ret;
89 @@ -1327,7 +1321,6 @@ static int __init ieee80211_init(void)
90
91 static void __exit ieee80211_exit(void)
92 {
93 - rc80211_minstrel_ht_exit();
94 rc80211_minstrel_exit();
95
96 ieee80211s_stop();
97 --- a/net/mac80211/rate.h
98 +++ b/net/mac80211/rate.h
99 @@ -95,18 +95,5 @@ static inline void rc80211_minstrel_exit
100 }
101 #endif
102
103 -#ifdef CPTCFG_MAC80211_RC_MINSTREL_HT
104 -int rc80211_minstrel_ht_init(void);
105 -void rc80211_minstrel_ht_exit(void);
106 -#else
107 -static inline int rc80211_minstrel_ht_init(void)
108 -{
109 - return 0;
110 -}
111 -static inline void rc80211_minstrel_ht_exit(void)
112 -{
113 -}
114 -#endif
115 -
116
117 #endif /* IEEE80211_RATE_H */
118 --- a/net/mac80211/rc80211_minstrel.c
119 +++ b/net/mac80211/rc80211_minstrel.c
120 @@ -572,138 +572,6 @@ minstrel_rate_init(void *priv, struct ie
121 minstrel_update_rates(mp, mi);
122 }
123
124 -static void *
125 -minstrel_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp)
126 -{
127 - struct ieee80211_supported_band *sband;
128 - struct minstrel_sta_info *mi;
129 - struct minstrel_priv *mp = priv;
130 - struct ieee80211_hw *hw = mp->hw;
131 - int max_rates = 0;
132 - int i;
133 -
134 - mi = kzalloc(sizeof(struct minstrel_sta_info), gfp);
135 - if (!mi)
136 - return NULL;
137 -
138 - for (i = 0; i < NUM_NL80211_BANDS; i++) {
139 - sband = hw->wiphy->bands[i];
140 - if (sband && sband->n_bitrates > max_rates)
141 - max_rates = sband->n_bitrates;
142 - }
143 -
144 - mi->r = kcalloc(max_rates, sizeof(struct minstrel_rate), gfp);
145 - if (!mi->r)
146 - goto error;
147 -
148 - mi->sample_table = kmalloc_array(max_rates, SAMPLE_COLUMNS, gfp);
149 - if (!mi->sample_table)
150 - goto error1;
151 -
152 - mi->last_stats_update = jiffies;
153 - return mi;
154 -
155 -error1:
156 - kfree(mi->r);
157 -error:
158 - kfree(mi);
159 - return NULL;
160 -}
161 -
162 -static void
163 -minstrel_free_sta(void *priv, struct ieee80211_sta *sta, void *priv_sta)
164 -{
165 - struct minstrel_sta_info *mi = priv_sta;
166 -
167 - kfree(mi->sample_table);
168 - kfree(mi->r);
169 - kfree(mi);
170 -}
171 -
172 -static void
173 -minstrel_init_cck_rates(struct minstrel_priv *mp)
174 -{
175 - static const int bitrates[4] = { 10, 20, 55, 110 };
176 - struct ieee80211_supported_band *sband;
177 - u32 rate_flags = ieee80211_chandef_rate_flags(&mp->hw->conf.chandef);
178 - int i, j;
179 -
180 - sband = mp->hw->wiphy->bands[NL80211_BAND_2GHZ];
181 - if (!sband)
182 - return;
183 -
184 - for (i = 0, j = 0; i < sband->n_bitrates; i++) {
185 - struct ieee80211_rate *rate = &sband->bitrates[i];
186 -
187 - if (rate->flags & IEEE80211_RATE_ERP_G)
188 - continue;
189 -
190 - if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
191 - continue;
192 -
193 - for (j = 0; j < ARRAY_SIZE(bitrates); j++) {
194 - if (rate->bitrate != bitrates[j])
195 - continue;
196 -
197 - mp->cck_rates[j] = i;
198 - break;
199 - }
200 - }
201 -}
202 -
203 -static void *
204 -minstrel_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
205 -{
206 - struct minstrel_priv *mp;
207 -
208 - mp = kzalloc(sizeof(struct minstrel_priv), GFP_ATOMIC);
209 - if (!mp)
210 - return NULL;
211 -
212 - /* contention window settings
213 - * Just an approximation. Using the per-queue values would complicate
214 - * the calculations and is probably unnecessary */
215 - mp->cw_min = 15;
216 - mp->cw_max = 1023;
217 -
218 - /* number of packets (in %) to use for sampling other rates
219 - * sample less often for non-mrr packets, because the overhead
220 - * is much higher than with mrr */
221 - mp->lookaround_rate = 5;
222 - mp->lookaround_rate_mrr = 10;
223 -
224 - /* maximum time that the hw is allowed to stay in one MRR segment */
225 - mp->segment_size = 6000;
226 -
227 - if (hw->max_rate_tries > 0)
228 - mp->max_retry = hw->max_rate_tries;
229 - else
230 - /* safe default, does not necessarily have to match hw properties */
231 - mp->max_retry = 7;
232 -
233 - if (hw->max_rates >= 4)
234 - mp->has_mrr = true;
235 -
236 - mp->hw = hw;
237 - mp->update_interval = 100;
238 -
239 -#ifdef CPTCFG_MAC80211_DEBUGFS
240 - mp->fixed_rate_idx = (u32) -1;
241 - debugfs_create_u32("fixed_rate_idx", S_IRUGO | S_IWUGO, debugfsdir,
242 - &mp->fixed_rate_idx);
243 -#endif
244 -
245 - minstrel_init_cck_rates(mp);
246 -
247 - return mp;
248 -}
249 -
250 -static void
251 -minstrel_free(void *priv)
252 -{
253 - kfree(priv);
254 -}
255 -
256 static u32 minstrel_get_expected_throughput(void *priv_sta)
257 {
258 struct minstrel_sta_info *mi = priv_sta;
259 @@ -722,28 +590,8 @@ static u32 minstrel_get_expected_through
260 }
261
262 const struct rate_control_ops mac80211_minstrel = {
263 - .name = "minstrel",
264 .tx_status_ext = minstrel_tx_status,
265 .get_rate = minstrel_get_rate,
266 .rate_init = minstrel_rate_init,
267 - .alloc = minstrel_alloc,
268 - .free = minstrel_free,
269 - .alloc_sta = minstrel_alloc_sta,
270 - .free_sta = minstrel_free_sta,
271 -#ifdef CPTCFG_MAC80211_DEBUGFS
272 - .add_sta_debugfs = minstrel_add_sta_debugfs,
273 -#endif
274 .get_expected_throughput = minstrel_get_expected_throughput,
275 };
276 -
277 -int __init
278 -rc80211_minstrel_init(void)
279 -{
280 - return ieee80211_rate_control_register(&mac80211_minstrel);
281 -}
282 -
283 -void
284 -rc80211_minstrel_exit(void)
285 -{
286 - ieee80211_rate_control_unregister(&mac80211_minstrel);
287 -}
288 --- a/net/mac80211/rc80211_minstrel.h
289 +++ b/net/mac80211/rc80211_minstrel.h
290 @@ -158,7 +158,5 @@ int minstrel_get_tp_avg(struct minstrel_
291 /* debugfs */
292 int minstrel_stats_open(struct inode *inode, struct file *file);
293 int minstrel_stats_csv_open(struct inode *inode, struct file *file);
294 -ssize_t minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos);
295 -int minstrel_stats_release(struct inode *inode, struct file *file);
296
297 #endif
298 --- a/net/mac80211/rc80211_minstrel_debugfs.c
299 +++ b/net/mac80211/rc80211_minstrel_debugfs.c
300 @@ -54,22 +54,6 @@
301 #include <net/mac80211.h>
302 #include "rc80211_minstrel.h"
303
304 -ssize_t
305 -minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos)
306 -{
307 - struct minstrel_debugfs_info *ms;
308 -
309 - ms = file->private_data;
310 - return simple_read_from_buffer(buf, len, ppos, ms->buf, ms->len);
311 -}
312 -
313 -int
314 -minstrel_stats_release(struct inode *inode, struct file *file)
315 -{
316 - kfree(file->private_data);
317 - return 0;
318 -}
319 -
320 int
321 minstrel_stats_open(struct inode *inode, struct file *file)
322 {
323 @@ -135,14 +119,6 @@ minstrel_stats_open(struct inode *inode,
324 return 0;
325 }
326
327 -static const struct file_operations minstrel_stat_fops = {
328 - .owner = THIS_MODULE,
329 - .open = minstrel_stats_open,
330 - .read = minstrel_stats_read,
331 - .release = minstrel_stats_release,
332 - .llseek = default_llseek,
333 -};
334 -
335 int
336 minstrel_stats_csv_open(struct inode *inode, struct file *file)
337 {
338 @@ -200,21 +176,3 @@ minstrel_stats_csv_open(struct inode *in
339
340 return 0;
341 }
342 -
343 -static const struct file_operations minstrel_stat_csv_fops = {
344 - .owner = THIS_MODULE,
345 - .open = minstrel_stats_csv_open,
346 - .read = minstrel_stats_read,
347 - .release = minstrel_stats_release,
348 - .llseek = default_llseek,
349 -};
350 -
351 -void
352 -minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir)
353 -{
354 - struct minstrel_sta_info *mi = priv_sta;
355 -
356 - debugfs_create_file("rc_stats", S_IRUGO, dir, mi, &minstrel_stat_fops);
357 - debugfs_create_file("rc_stats_csv", S_IRUGO, dir, mi,
358 - &minstrel_stat_csv_fops);
359 -}
360 --- a/net/mac80211/rc80211_minstrel_ht.c
361 +++ b/net/mac80211/rc80211_minstrel_ht.c
362 @@ -137,12 +137,10 @@
363 } \
364 }
365
366 -#ifdef CPTCFG_MAC80211_RC_MINSTREL_VHT
367 static bool minstrel_vht_only = true;
368 module_param(minstrel_vht_only, bool, 0644);
369 MODULE_PARM_DESC(minstrel_vht_only,
370 "Use only VHT rates when VHT is supported by sta.");
371 -#endif
372
373 /*
374 * To enable sufficiently targeted rate sampling, MCS rates are divided into
375 @@ -171,7 +169,6 @@ const struct mcs_group minstrel_mcs_grou
376
377 CCK_GROUP,
378
379 -#ifdef CPTCFG_MAC80211_RC_MINSTREL_VHT
380 VHT_GROUP(1, 0, BW_20),
381 VHT_GROUP(2, 0, BW_20),
382 VHT_GROUP(3, 0, BW_20),
383 @@ -195,7 +192,6 @@ const struct mcs_group minstrel_mcs_grou
384 VHT_GROUP(1, 1, BW_80),
385 VHT_GROUP(2, 1, BW_80),
386 VHT_GROUP(3, 1, BW_80),
387 -#endif
388 };
389
390 static u8 sample_table[SAMPLE_COLUMNS][MCS_GROUP_RATES] __read_mostly;
391 @@ -1146,12 +1142,10 @@ minstrel_ht_update_caps(void *priv, stru
392
393 BUILD_BUG_ON(ARRAY_SIZE(minstrel_mcs_groups) != MINSTREL_GROUPS_NB);
394
395 -#ifdef CPTCFG_MAC80211_RC_MINSTREL_VHT
396 if (vht_cap->vht_supported)
397 use_vht = vht_cap->vht_mcs.tx_mcs_map != cpu_to_le16(~0);
398 else
399 -#endif
400 - use_vht = 0;
401 + use_vht = 0;
402
403 msp->is_ht = true;
404 memset(mi, 0, sizeof(*mi));
405 @@ -1226,10 +1220,9 @@ minstrel_ht_update_caps(void *priv, stru
406
407 /* HT rate */
408 if (gflags & IEEE80211_TX_RC_MCS) {
409 -#ifdef CPTCFG_MAC80211_RC_MINSTREL_VHT
410 if (use_vht && minstrel_vht_only)
411 continue;
412 -#endif
413 +
414 mi->supported[i] = mcs->rx_mask[nss - 1];
415 if (mi->supported[i])
416 n_supported++;
417 @@ -1349,16 +1342,88 @@ minstrel_ht_free_sta(void *priv, struct
418 kfree(msp);
419 }
420
421 +static void
422 +minstrel_ht_init_cck_rates(struct minstrel_priv *mp)
423 +{
424 + static const int bitrates[4] = { 10, 20, 55, 110 };
425 + struct ieee80211_supported_band *sband;
426 + u32 rate_flags = ieee80211_chandef_rate_flags(&mp->hw->conf.chandef);
427 + int i, j;
428 +
429 + sband = mp->hw->wiphy->bands[NL80211_BAND_2GHZ];
430 + if (!sband)
431 + return;
432 +
433 + for (i = 0, j = 0; i < sband->n_bitrates; i++) {
434 + struct ieee80211_rate *rate = &sband->bitrates[i];
435 +
436 + if (rate->flags & IEEE80211_RATE_ERP_G)
437 + continue;
438 +
439 + if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
440 + continue;
441 +
442 + for (j = 0; j < ARRAY_SIZE(bitrates); j++) {
443 + if (rate->bitrate != bitrates[j])
444 + continue;
445 +
446 + mp->cck_rates[j] = i;
447 + break;
448 + }
449 + }
450 +}
451 +
452 static void *
453 minstrel_ht_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
454 {
455 - return mac80211_minstrel.alloc(hw, debugfsdir);
456 + struct minstrel_priv *mp;
457 +
458 + mp = kzalloc(sizeof(struct minstrel_priv), GFP_ATOMIC);
459 + if (!mp)
460 + return NULL;
461 +
462 + /* contention window settings
463 + * Just an approximation. Using the per-queue values would complicate
464 + * the calculations and is probably unnecessary */
465 + mp->cw_min = 15;
466 + mp->cw_max = 1023;
467 +
468 + /* number of packets (in %) to use for sampling other rates
469 + * sample less often for non-mrr packets, because the overhead
470 + * is much higher than with mrr */
471 + mp->lookaround_rate = 5;
472 + mp->lookaround_rate_mrr = 10;
473 +
474 + /* maximum time that the hw is allowed to stay in one MRR segment */
475 + mp->segment_size = 6000;
476 +
477 + if (hw->max_rate_tries > 0)
478 + mp->max_retry = hw->max_rate_tries;
479 + else
480 + /* safe default, does not necessarily have to match hw properties */
481 + mp->max_retry = 7;
482 +
483 + if (hw->max_rates >= 4)
484 + mp->has_mrr = true;
485 +
486 + mp->hw = hw;
487 + mp->update_interval = 100;
488 +
489 +#ifdef CPTCFG_MAC80211_DEBUGFS
490 + mp->fixed_rate_idx = (u32) -1;
491 + debugfs_create_u32("fixed_rate_idx", S_IRUGO | S_IWUGO, debugfsdir,
492 + &mp->fixed_rate_idx);
493 +#endif
494 +
495 + minstrel_ht_init_cck_rates(mp);
496 +
497 + return mp;
498 }
499
500 static void
501 minstrel_ht_free(void *priv)
502 {
503 - mac80211_minstrel.free(priv);
504 + kfree(priv);
505 }
506
507 static u32 minstrel_ht_get_expected_throughput(void *priv_sta)
508 @@ -1417,14 +1482,14 @@ static void __init init_sample_table(voi
509 }
510
511 int __init
512 -rc80211_minstrel_ht_init(void)
513 +rc80211_minstrel_init(void)
514 {
515 init_sample_table();
516 return ieee80211_rate_control_register(&mac80211_minstrel_ht);
517 }
518
519 void
520 -rc80211_minstrel_ht_exit(void)
521 +rc80211_minstrel_exit(void)
522 {
523 ieee80211_rate_control_unregister(&mac80211_minstrel_ht);
524 }
525 --- a/net/mac80211/rc80211_minstrel_ht.h
526 +++ b/net/mac80211/rc80211_minstrel_ht.h
527 @@ -15,11 +15,7 @@
528 */
529 #define MINSTREL_MAX_STREAMS 3
530 #define MINSTREL_HT_STREAM_GROUPS 4 /* BW(=2) * SGI(=2) */
531 -#ifdef CPTCFG_MAC80211_RC_MINSTREL_VHT
532 #define MINSTREL_VHT_STREAM_GROUPS 6 /* BW(=3) * SGI(=2) */
533 -#else
534 -#define MINSTREL_VHT_STREAM_GROUPS 0
535 -#endif
536
537 #define MINSTREL_HT_GROUPS_NB (MINSTREL_MAX_STREAMS * \
538 MINSTREL_HT_STREAM_GROUPS)
539 @@ -34,11 +30,7 @@
540 #define MINSTREL_CCK_GROUP (MINSTREL_HT_GROUP_0 + MINSTREL_HT_GROUPS_NB)
541 #define MINSTREL_VHT_GROUP_0 (MINSTREL_CCK_GROUP + 1)
542
543 -#ifdef CPTCFG_MAC80211_RC_MINSTREL_VHT
544 #define MCS_GROUP_RATES 10
545 -#else
546 -#define MCS_GROUP_RATES 8
547 -#endif
548
549 struct mcs_group {
550 u32 flags;
551 --- a/net/mac80211/rc80211_minstrel_ht_debugfs.c
552 +++ b/net/mac80211/rc80211_minstrel_ht_debugfs.c
553 @@ -15,6 +15,22 @@
554 #include "rc80211_minstrel.h"
555 #include "rc80211_minstrel_ht.h"
556
557 +static ssize_t
558 +minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos)
559 +{
560 + struct minstrel_debugfs_info *ms;
561 +
562 + ms = file->private_data;
563 + return simple_read_from_buffer(buf, len, ppos, ms->buf, ms->len);
564 +}
565 +
566 +static int
567 +minstrel_stats_release(struct inode *inode, struct file *file)
568 +{
569 + kfree(file->private_data);
570 + return 0;
571 +}
572 +
573 static char *
574 minstrel_ht_stats_dump(struct minstrel_ht_sta *mi, int i, char *p)
575 {
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