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1 | /* |
2 | * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org> |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License version 2 as |
6 | * published by the Free Software Foundation. |
7 | * |
8 | * Based on minstrel.c: |
9 | * Copyright (C) 2005-2007 Derek Smithies <derek@indranet.co.nz> |
10 | * Sponsored by Indranet Technologies Ltd |
11 | * |
12 | * Based on sample.c: |
13 | * Copyright (c) 2005 John Bicket |
14 | * All rights reserved. |
15 | * |
16 | * Redistribution and use in source and binary forms, with or without |
17 | * modification, are permitted provided that the following conditions |
18 | * are met: |
19 | * 1. Redistributions of source code must retain the above copyright |
20 | * notice, this list of conditions and the following disclaimer, |
21 | * without modification. |
22 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer |
23 | * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any |
24 | * redistribution must be conditioned upon including a substantially |
25 | * similar Disclaimer requirement for further binary redistribution. |
26 | * 3. Neither the names of the above-listed copyright holders nor the names |
27 | * of any contributors may be used to endorse or promote products derived |
28 | * from this software without specific prior written permission. |
29 | * |
30 | * Alternatively, this software may be distributed under the terms of the |
31 | * GNU General Public License ("GPL") version 2 as published by the Free |
32 | * Software Foundation. |
33 | * |
34 | * NO WARRANTY |
35 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
36 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
37 | * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY |
38 | * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL |
39 | * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, |
40 | * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
41 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
42 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER |
43 | * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
44 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
45 | * THE POSSIBILITY OF SUCH DAMAGES. |
46 | */ |
47 | #include <linux/netdevice.h> |
48 | #include <linux/types.h> |
49 | #include <linux/skbuff.h> |
50 | #include <linux/debugfs.h> |
51 | #include <linux/random.h> |
52 | #include <linux/ieee80211.h> |
53 | #include <linux/slab.h> |
54 | #include <net/mac80211.h> |
55 | #include "rate.h" |
56 | #include "rc80211_minstrel.h" |
57 | |
58 | #define SAMPLE_COLUMNS 10 |
59 | #define SAMPLE_TBL(_mi, _idx, _col) \ |
60 | _mi->sample_table[(_idx * SAMPLE_COLUMNS) + _col] |
61 | |
62 | /* convert mac80211 rate index to local array index */ |
63 | static inline int |
64 | rix_to_ndx(struct minstrel_sta_info *mi, int rix) |
65 | { |
66 | int i = rix; |
67 | for (i = rix; i >= 0; i--) |
68 | if (mi->r[i].rix == rix) |
69 | break; |
70 | return i; |
71 | } |
72 | |
73 | static void |
74 | minstrel_update_stats(struct minstrel_priv *mp, struct minstrel_sta_info *mi) |
75 | { |
76 | u32 max_tp = 0, index_max_tp = 0, index_max_tp2 = 0; |
77 | u32 max_prob = 0, index_max_prob = 0; |
78 | u32 usecs; |
79 | u32 p; |
80 | int i; |
81 | |
82 | mi->stats_update = jiffies; |
83 | for (i = 0; i < mi->n_rates; i++) { |
84 | struct minstrel_rate *mr = &mi->r[i]; |
85 | |
86 | usecs = mr->perfect_tx_time; |
87 | if (!usecs) |
88 | usecs = 1000000; |
89 | |
90 | /* To avoid rounding issues, probabilities scale from 0 (0%) |
91 | * to 18000 (100%) */ |
92 | if (mr->attempts) { |
93 | p = (mr->success * 18000) / mr->attempts; |
94 | mr->succ_hist += mr->success; |
95 | mr->att_hist += mr->attempts; |
96 | mr->cur_prob = p; |
97 | p = ((p * (100 - mp->ewma_level)) + (mr->probability * |
98 | mp->ewma_level)) / 100; |
99 | mr->probability = p; |
100 | mr->cur_tp = p * (1000000 / usecs); |
101 | } |
102 | |
103 | mr->last_success = mr->success; |
104 | mr->last_attempts = mr->attempts; |
105 | mr->success = 0; |
106 | mr->attempts = 0; |
107 | |
108 | /* Sample less often below the 10% chance of success. |
109 | * Sample less often above the 95% chance of success. */ |
110 | if ((mr->probability > 17100) || (mr->probability < 1800)) { |
111 | mr->adjusted_retry_count = mr->retry_count >> 1; |
112 | if (mr->adjusted_retry_count > 2) |
113 | mr->adjusted_retry_count = 2; |
114 | mr->sample_limit = 4; |
115 | } else { |
116 | mr->sample_limit = -1; |
117 | mr->adjusted_retry_count = mr->retry_count; |
118 | } |
119 | if (!mr->adjusted_retry_count) |
120 | mr->adjusted_retry_count = 2; |
121 | } |
122 | |
123 | for (i = 0; i < mi->n_rates; i++) { |
124 | struct minstrel_rate *mr = &mi->r[i]; |
125 | if (max_tp < mr->cur_tp) { |
126 | index_max_tp = i; |
127 | max_tp = mr->cur_tp; |
128 | } |
129 | if (max_prob < mr->probability) { |
130 | index_max_prob = i; |
131 | max_prob = mr->probability; |
132 | } |
133 | } |
134 | |
135 | max_tp = 0; |
136 | for (i = 0; i < mi->n_rates; i++) { |
137 | struct minstrel_rate *mr = &mi->r[i]; |
138 | |
139 | if (i == index_max_tp) |
140 | continue; |
141 | |
142 | if (max_tp < mr->cur_tp) { |
143 | index_max_tp2 = i; |
144 | max_tp = mr->cur_tp; |
145 | } |
146 | } |
147 | mi->max_tp_rate = index_max_tp; |
148 | mi->max_tp_rate2 = index_max_tp2; |
149 | mi->max_prob_rate = index_max_prob; |
150 | } |
151 | |
152 | static void |
153 | minstrel_tx_status(void *priv, struct ieee80211_supported_band *sband, |
154 | struct ieee80211_sta *sta, void *priv_sta, |
155 | struct sk_buff *skb) |
156 | { |
157 | struct minstrel_priv *mp = priv; |
158 | struct minstrel_sta_info *mi = priv_sta; |
159 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
160 | struct ieee80211_tx_rate *ar = info->status.rates; |
161 | int i, ndx; |
162 | int success; |
163 | |
164 | success = !!(info->flags & IEEE80211_TX_STAT_ACK); |
165 | |
166 | for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { |
167 | if (ar[i].idx < 0) |
168 | break; |
169 | |
170 | ndx = rix_to_ndx(mi, ar[i].idx); |
171 | if (ndx < 0) |
172 | continue; |
173 | |
174 | mi->r[ndx].attempts += ar[i].count; |
175 | |
176 | if ((i != IEEE80211_TX_MAX_RATES - 1) && (ar[i + 1].idx < 0)) |
177 | mi->r[ndx].success += success; |
178 | } |
179 | |
180 | if ((info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) && (i >= 0)) |
181 | mi->sample_count++; |
182 | |
183 | if (mi->sample_deferred > 0) |
184 | mi->sample_deferred--; |
185 | |
186 | if (time_after(jiffies, mi->stats_update + |
187 | (mp->update_interval * HZ) / 1000)) |
188 | minstrel_update_stats(mp, mi); |
189 | } |
190 | |
191 | |
192 | static inline unsigned int |
193 | minstrel_get_retry_count(struct minstrel_rate *mr, |
194 | struct ieee80211_tx_info *info) |
195 | { |
196 | unsigned int retry = mr->adjusted_retry_count; |
197 | |
198 | if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) |
199 | retry = max(2U, min(mr->retry_count_rtscts, retry)); |
200 | else if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) |
201 | retry = max(2U, min(mr->retry_count_cts, retry)); |
202 | return retry; |
203 | } |
204 | |
205 | |
206 | static int |
207 | minstrel_get_next_sample(struct minstrel_sta_info *mi) |
208 | { |
209 | unsigned int sample_ndx; |
210 | sample_ndx = SAMPLE_TBL(mi, mi->sample_idx, mi->sample_column); |
211 | mi->sample_idx++; |
212 | if ((int) mi->sample_idx > (mi->n_rates - 2)) { |
213 | mi->sample_idx = 0; |
214 | mi->sample_column++; |
215 | if (mi->sample_column >= SAMPLE_COLUMNS) |
216 | mi->sample_column = 0; |
217 | } |
218 | return sample_ndx; |
219 | } |
220 | |
221 | static void |
222 | minstrel_get_rate(void *priv, struct ieee80211_sta *sta, |
223 | void *priv_sta, struct ieee80211_tx_rate_control *txrc) |
224 | { |
225 | struct sk_buff *skb = txrc->skb; |
226 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
227 | struct minstrel_sta_info *mi = priv_sta; |
228 | struct minstrel_priv *mp = priv; |
229 | struct ieee80211_tx_rate *ar = info->control.rates; |
230 | unsigned int ndx, sample_ndx = 0; |
231 | bool mrr; |
232 | bool sample_slower = false; |
233 | bool sample = false; |
234 | int i, delta; |
235 | int mrr_ndx[3]; |
236 | int sample_rate; |
237 | |
238 | if (rate_control_send_low(sta, priv_sta, txrc)) |
239 | return; |
240 | |
241 | mrr = mp->has_mrr && !txrc->rts && !txrc->bss_conf->use_cts_prot; |
242 | |
243 | ndx = mi->max_tp_rate; |
244 | |
245 | if (mrr) |
246 | sample_rate = mp->lookaround_rate_mrr; |
247 | else |
248 | sample_rate = mp->lookaround_rate; |
249 | |
250 | mi->packet_count++; |
251 | delta = (mi->packet_count * sample_rate / 100) - |
252 | (mi->sample_count + mi->sample_deferred / 2); |
253 | |
254 | /* delta > 0: sampling required */ |
255 | if ((delta > 0) && (mrr || !mi->prev_sample)) { |
256 | struct minstrel_rate *msr; |
257 | if (mi->packet_count >= 10000) { |
258 | mi->sample_deferred = 0; |
259 | mi->sample_count = 0; |
260 | mi->packet_count = 0; |
261 | } else if (delta > mi->n_rates * 2) { |
262 | /* With multi-rate retry, not every planned sample |
263 | * attempt actually gets used, due to the way the retry |
264 | * chain is set up - [max_tp,sample,prob,lowest] for |
265 | * sample_rate < max_tp. |
266 | * |
267 | * If there's too much sampling backlog and the link |
268 | * starts getting worse, minstrel would start bursting |
269 | * out lots of sampling frames, which would result |
270 | * in a large throughput loss. */ |
271 | mi->sample_count += (delta - mi->n_rates * 2); |
272 | } |
273 | |
274 | sample_ndx = minstrel_get_next_sample(mi); |
275 | msr = &mi->r[sample_ndx]; |
276 | sample = true; |
277 | sample_slower = mrr && (msr->perfect_tx_time > |
278 | mi->r[ndx].perfect_tx_time); |
279 | |
280 | if (!sample_slower) { |
281 | if (msr->sample_limit != 0) { |
282 | ndx = sample_ndx; |
283 | mi->sample_count++; |
284 | if (msr->sample_limit > 0) |
285 | msr->sample_limit--; |
286 | } else { |
287 | sample = false; |
288 | } |
289 | } else { |
290 | /* Only use IEEE80211_TX_CTL_RATE_CTRL_PROBE to mark |
291 | * packets that have the sampling rate deferred to the |
292 | * second MRR stage. Increase the sample counter only |
293 | * if the deferred sample rate was actually used. |
294 | * Use the sample_deferred counter to make sure that |
295 | * the sampling is not done in large bursts */ |
296 | info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE; |
297 | mi->sample_deferred++; |
298 | } |
299 | } |
300 | mi->prev_sample = sample; |
301 | |
302 | /* If we're not using MRR and the sampling rate already |
303 | * has a probability of >95%, we shouldn't be attempting |
304 | * to use it, as this only wastes precious airtime */ |
305 | if (!mrr && sample && (mi->r[ndx].probability > 17100)) |
306 | ndx = mi->max_tp_rate; |
307 | |
308 | ar[0].idx = mi->r[ndx].rix; |
309 | ar[0].count = minstrel_get_retry_count(&mi->r[ndx], info); |
310 | |
311 | if (!mrr) { |
312 | if (!sample) |
313 | ar[0].count = mp->max_retry; |
314 | ar[1].idx = mi->lowest_rix; |
315 | ar[1].count = mp->max_retry; |
316 | return; |
317 | } |
318 | |
319 | /* MRR setup */ |
320 | if (sample) { |
321 | if (sample_slower) |
322 | mrr_ndx[0] = sample_ndx; |
323 | else |
324 | mrr_ndx[0] = mi->max_tp_rate; |
325 | } else { |
326 | mrr_ndx[0] = mi->max_tp_rate2; |
327 | } |
328 | mrr_ndx[1] = mi->max_prob_rate; |
329 | mrr_ndx[2] = 0; |
330 | for (i = 1; i < 4; i++) { |
331 | ar[i].idx = mi->r[mrr_ndx[i - 1]].rix; |
332 | ar[i].count = mi->r[mrr_ndx[i - 1]].adjusted_retry_count; |
333 | } |
334 | } |
335 | |
336 | |
337 | static void |
338 | calc_rate_durations(enum ieee80211_band band, |
339 | struct minstrel_rate *d, |
340 | struct ieee80211_rate *rate) |
341 | { |
342 | int erp = !!(rate->flags & IEEE80211_RATE_ERP_G); |
343 | |
344 | d->perfect_tx_time = ieee80211_frame_duration(band, 1200, |
345 | rate->bitrate, erp, 1); |
346 | d->ack_time = ieee80211_frame_duration(band, 10, |
347 | rate->bitrate, erp, 1); |
348 | } |
349 | |
350 | static void |
351 | init_sample_table(struct minstrel_sta_info *mi) |
352 | { |
353 | unsigned int i, col, new_idx; |
354 | unsigned int n_srates = mi->n_rates - 1; |
355 | u8 rnd[8]; |
356 | |
357 | mi->sample_column = 0; |
358 | mi->sample_idx = 0; |
359 | memset(mi->sample_table, 0, SAMPLE_COLUMNS * mi->n_rates); |
360 | |
361 | for (col = 0; col < SAMPLE_COLUMNS; col++) { |
362 | for (i = 0; i < n_srates; i++) { |
363 | get_random_bytes(rnd, sizeof(rnd)); |
364 | new_idx = (i + rnd[i & 7]) % n_srates; |
365 | |
366 | while (SAMPLE_TBL(mi, new_idx, col) != 0) |
367 | new_idx = (new_idx + 1) % n_srates; |
368 | |
369 | /* Don't sample the slowest rate (i.e. slowest base |
370 | * rate). We must presume that the slowest rate works |
371 | * fine, or else other management frames will also be |
372 | * failing and the link will break */ |
373 | SAMPLE_TBL(mi, new_idx, col) = i + 1; |
374 | } |
375 | } |
376 | } |
377 | |
378 | static void |
379 | minstrel_rate_init(void *priv, struct ieee80211_supported_band *sband, |
380 | struct ieee80211_sta *sta, void *priv_sta) |
381 | { |
382 | struct minstrel_sta_info *mi = priv_sta; |
383 | struct minstrel_priv *mp = priv; |
384 | struct ieee80211_rate *ctl_rate; |
385 | unsigned int i, n = 0; |
386 | unsigned int t_slot = 9; /* FIXME: get real slot time */ |
387 | |
388 | mi->lowest_rix = rate_lowest_index(sband, sta); |
389 | ctl_rate = &sband->bitrates[mi->lowest_rix]; |
390 | mi->sp_ack_dur = ieee80211_frame_duration(sband->band, 10, |
391 | ctl_rate->bitrate, |
392 | !!(ctl_rate->flags & IEEE80211_RATE_ERP_G), 1); |
393 | |
394 | for (i = 0; i < sband->n_bitrates; i++) { |
395 | struct minstrel_rate *mr = &mi->r[n]; |
396 | unsigned int tx_time = 0, tx_time_cts = 0, tx_time_rtscts = 0; |
397 | unsigned int tx_time_single; |
398 | unsigned int cw = mp->cw_min; |
399 | |
400 | if (!rate_supported(sta, sband->band, i)) |
401 | continue; |
402 | n++; |
403 | memset(mr, 0, sizeof(*mr)); |
404 | |
405 | mr->rix = i; |
406 | mr->bitrate = sband->bitrates[i].bitrate / 5; |
407 | calc_rate_durations(sband->band, mr, &sband->bitrates[i]); |
408 | |
409 | /* calculate maximum number of retransmissions before |
410 | * fallback (based on maximum segment size) */ |
411 | mr->sample_limit = -1; |
412 | mr->retry_count = 1; |
413 | mr->retry_count_cts = 1; |
414 | mr->retry_count_rtscts = 1; |
415 | tx_time = mr->perfect_tx_time + mi->sp_ack_dur; |
416 | do { |
417 | /* add one retransmission */ |
418 | tx_time_single = mr->ack_time + mr->perfect_tx_time; |
419 | |
420 | /* contention window */ |
421 | tx_time_single += (t_slot * cw) >> 1; |
422 | cw = min((cw << 1) | 1, mp->cw_max); |
423 | |
424 | tx_time += tx_time_single; |
425 | tx_time_cts += tx_time_single + mi->sp_ack_dur; |
426 | tx_time_rtscts += tx_time_single + 2 * mi->sp_ack_dur; |
427 | if ((tx_time_cts < mp->segment_size) && |
428 | (mr->retry_count_cts < mp->max_retry)) |
429 | mr->retry_count_cts++; |
430 | if ((tx_time_rtscts < mp->segment_size) && |
431 | (mr->retry_count_rtscts < mp->max_retry)) |
432 | mr->retry_count_rtscts++; |
433 | } while ((tx_time < mp->segment_size) && |
434 | (++mr->retry_count < mp->max_retry)); |
435 | mr->adjusted_retry_count = mr->retry_count; |
436 | } |
437 | |
438 | for (i = n; i < sband->n_bitrates; i++) { |
439 | struct minstrel_rate *mr = &mi->r[i]; |
440 | mr->rix = -1; |
441 | } |
442 | |
443 | mi->n_rates = n; |
444 | mi->stats_update = jiffies; |
445 | |
446 | init_sample_table(mi); |
447 | } |
448 | |
449 | static void * |
450 | minstrel_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp) |
451 | { |
452 | struct ieee80211_supported_band *sband; |
453 | struct minstrel_sta_info *mi; |
454 | struct minstrel_priv *mp = priv; |
455 | struct ieee80211_hw *hw = mp->hw; |
456 | int max_rates = 0; |
457 | int i; |
458 | |
459 | mi = kzalloc(sizeof(struct minstrel_sta_info), gfp); |
460 | if (!mi) |
461 | return NULL; |
462 | |
463 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) { |
464 | sband = hw->wiphy->bands[i]; |
465 | if (sband && sband->n_bitrates > max_rates) |
466 | max_rates = sband->n_bitrates; |
467 | } |
468 | |
469 | mi->r = kzalloc(sizeof(struct minstrel_rate) * max_rates, gfp); |
470 | if (!mi->r) |
471 | goto error; |
472 | |
473 | mi->sample_table = kmalloc(SAMPLE_COLUMNS * max_rates, gfp); |
474 | if (!mi->sample_table) |
475 | goto error1; |
476 | |
477 | mi->stats_update = jiffies; |
478 | return mi; |
479 | |
480 | error1: |
481 | kfree(mi->r); |
482 | error: |
483 | kfree(mi); |
484 | return NULL; |
485 | } |
486 | |
487 | static void |
488 | minstrel_free_sta(void *priv, struct ieee80211_sta *sta, void *priv_sta) |
489 | { |
490 | struct minstrel_sta_info *mi = priv_sta; |
491 | |
492 | kfree(mi->sample_table); |
493 | kfree(mi->r); |
494 | kfree(mi); |
495 | } |
496 | |
497 | static void |
498 | minstrel_init_cck_rates(struct minstrel_priv *mp) |
499 | { |
500 | static const int bitrates[4] = { 10, 20, 55, 110 }; |
501 | struct ieee80211_supported_band *sband; |
502 | int i, j; |
503 | |
504 | sband = mp->hw->wiphy->bands[IEEE80211_BAND_2GHZ]; |
505 | if (!sband) |
506 | return; |
507 | |
508 | for (i = 0, j = 0; i < sband->n_bitrates; i++) { |
509 | struct ieee80211_rate *rate = &sband->bitrates[i]; |
510 | |
511 | if (rate->flags & IEEE80211_RATE_ERP_G) |
512 | continue; |
513 | |
514 | for (j = 0; j < ARRAY_SIZE(bitrates); j++) { |
515 | if (rate->bitrate != bitrates[j]) |
516 | continue; |
517 | |
518 | mp->cck_rates[j] = i; |
519 | break; |
520 | } |
521 | } |
522 | } |
523 | |
524 | static void * |
525 | minstrel_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) |
526 | { |
527 | struct minstrel_priv *mp; |
528 | |
529 | mp = kzalloc(sizeof(struct minstrel_priv), GFP_ATOMIC); |
530 | if (!mp) |
531 | return NULL; |
532 | |
533 | /* contention window settings |
534 | * Just an approximation. Using the per-queue values would complicate |
535 | * the calculations and is probably unnecessary */ |
536 | mp->cw_min = 15; |
537 | mp->cw_max = 1023; |
538 | |
539 | /* number of packets (in %) to use for sampling other rates |
540 | * sample less often for non-mrr packets, because the overhead |
541 | * is much higher than with mrr */ |
542 | mp->lookaround_rate = 5; |
543 | mp->lookaround_rate_mrr = 10; |
544 | |
545 | /* moving average weight for EWMA */ |
546 | mp->ewma_level = 75; |
547 | |
548 | /* maximum time that the hw is allowed to stay in one MRR segment */ |
549 | mp->segment_size = 6000; |
550 | |
551 | if (hw->max_rate_tries > 0) |
552 | mp->max_retry = hw->max_rate_tries; |
553 | else |
554 | /* safe default, does not necessarily have to match hw properties */ |
555 | mp->max_retry = 7; |
556 | |
557 | if (hw->max_rates >= 4) |
558 | mp->has_mrr = true; |
559 | |
560 | mp->hw = hw; |
561 | mp->update_interval = 100; |
562 | |
563 | #ifdef CONFIG_MAC80211_DEBUGFS |
564 | mp->fixed_rate_idx = (u32) -1; |
565 | mp->dbg_fixed_rate = debugfs_create_u32("fixed_rate_idx", |
566 | S_IRUGO | S_IWUGO, debugfsdir, &mp->fixed_rate_idx); |
567 | #endif |
568 | |
569 | minstrel_init_cck_rates(mp); |
570 | |
571 | return mp; |
572 | } |
573 | |
574 | static void |
575 | minstrel_free(void *priv) |
576 | { |
577 | #ifdef CONFIG_MAC80211_DEBUGFS |
578 | debugfs_remove(((struct minstrel_priv *)priv)->dbg_fixed_rate); |
579 | #endif |
580 | kfree(priv); |
581 | } |
582 | |
583 | struct rate_control_ops mac80211_minstrel = { |
584 | .name = "minstrel", |
585 | .tx_status = minstrel_tx_status, |
586 | .get_rate = minstrel_get_rate, |
587 | .rate_init = minstrel_rate_init, |
588 | .alloc = minstrel_alloc, |
589 | .free = minstrel_free, |
590 | .alloc_sta = minstrel_alloc_sta, |
591 | .free_sta = minstrel_free_sta, |
592 | #ifdef CONFIG_MAC80211_DEBUGFS |
593 | .add_sta_debugfs = minstrel_add_sta_debugfs, |
594 | .remove_sta_debugfs = minstrel_remove_sta_debugfs, |
595 | #endif |
596 | }; |
597 | |
598 | int __init |
599 | rc80211_minstrel_init(void) |
600 | { |
601 | return ieee80211_rate_control_register(&mac80211_minstrel); |
602 | } |
603 | |
604 | void |
605 | rc80211_minstrel_exit(void) |
606 | { |
607 | ieee80211_rate_control_unregister(&mac80211_minstrel); |
608 | } |
609 | |
610 |
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javiroman/ks7010
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9