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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 <net/mac80211.h> | |
54 | #include "rate.h" | |
55 | #include "rc80211_minstrel.h" | |
56 | ||
57 | #define SAMPLE_COLUMNS 10 | |
58 | #define SAMPLE_TBL(_mi, _idx, _col) \ | |
59 | _mi->sample_table[(_idx * SAMPLE_COLUMNS) + _col] | |
60 | ||
61 | /* convert mac80211 rate index to local array index */ | |
62 | static inline int | |
63 | rix_to_ndx(struct minstrel_sta_info *mi, int rix) | |
64 | { | |
65 | int i = rix; | |
66 | for (i = rix; i >= 0; i--) | |
67 | if (mi->r[i].rix == rix) | |
68 | break; | |
69 | WARN_ON(mi->r[i].rix != rix); | |
70 | return i; | |
71 | } | |
72 | ||
73 | static inline bool | |
74 | use_low_rate(struct sk_buff *skb) | |
75 | { | |
76 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
77 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
78 | u16 fc; | |
79 | ||
80 | fc = le16_to_cpu(hdr->frame_control); | |
81 | ||
82 | return ((info->flags & IEEE80211_TX_CTL_NO_ACK) || | |
83 | (fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA || | |
84 | is_multicast_ether_addr(hdr->addr1)); | |
85 | } | |
86 | ||
87 | ||
88 | static void | |
89 | minstrel_update_stats(struct minstrel_priv *mp, struct minstrel_sta_info *mi) | |
90 | { | |
91 | u32 max_tp = 0, index_max_tp = 0, index_max_tp2 = 0; | |
92 | u32 max_prob = 0, index_max_prob = 0; | |
93 | u32 usecs; | |
94 | u32 p; | |
95 | int i; | |
96 | ||
97 | mi->stats_update = jiffies; | |
98 | for (i = 0; i < mi->n_rates; i++) { | |
99 | struct minstrel_rate *mr = &mi->r[i]; | |
100 | ||
101 | usecs = mr->perfect_tx_time; | |
102 | if (!usecs) | |
103 | usecs = 1000000; | |
104 | ||
105 | /* To avoid rounding issues, probabilities scale from 0 (0%) | |
106 | * to 18000 (100%) */ | |
107 | if (mr->attempts) { | |
108 | p = (mr->success * 18000) / mr->attempts; | |
109 | mr->succ_hist += mr->success; | |
110 | mr->att_hist += mr->attempts; | |
111 | mr->cur_prob = p; | |
112 | p = ((p * (100 - mp->ewma_level)) + (mr->probability * | |
113 | mp->ewma_level)) / 100; | |
114 | mr->probability = p; | |
115 | mr->cur_tp = p * (1000000 / usecs); | |
116 | } | |
117 | ||
118 | mr->last_success = mr->success; | |
119 | mr->last_attempts = mr->attempts; | |
120 | mr->success = 0; | |
121 | mr->attempts = 0; | |
122 | ||
123 | /* Sample less often below the 10% chance of success. | |
124 | * Sample less often above the 95% chance of success. */ | |
125 | if ((mr->probability > 17100) || (mr->probability < 1800)) { | |
126 | mr->adjusted_retry_count = mr->retry_count >> 1; | |
127 | if (mr->adjusted_retry_count > 2) | |
128 | mr->adjusted_retry_count = 2; | |
129 | } else { | |
130 | mr->adjusted_retry_count = mr->retry_count; | |
131 | } | |
132 | if (!mr->adjusted_retry_count) | |
133 | mr->adjusted_retry_count = 2; | |
134 | } | |
135 | ||
136 | for (i = 0; i < mi->n_rates; i++) { | |
137 | struct minstrel_rate *mr = &mi->r[i]; | |
138 | if (max_tp < mr->cur_tp) { | |
139 | index_max_tp = i; | |
140 | max_tp = mr->cur_tp; | |
141 | } | |
142 | if (max_prob < mr->probability) { | |
143 | index_max_prob = i; | |
144 | max_prob = mr->probability; | |
145 | } | |
146 | } | |
147 | ||
148 | max_tp = 0; | |
149 | for (i = 0; i < mi->n_rates; i++) { | |
150 | struct minstrel_rate *mr = &mi->r[i]; | |
151 | ||
152 | if (i == index_max_tp) | |
153 | continue; | |
154 | ||
155 | if (max_tp < mr->cur_tp) { | |
156 | index_max_tp2 = i; | |
157 | max_tp = mr->cur_tp; | |
158 | } | |
159 | } | |
160 | mi->max_tp_rate = index_max_tp; | |
161 | mi->max_tp_rate2 = index_max_tp2; | |
162 | mi->max_prob_rate = index_max_prob; | |
163 | } | |
164 | ||
165 | static void | |
166 | minstrel_tx_status(void *priv, struct ieee80211_supported_band *sband, | |
167 | struct ieee80211_sta *sta, void *priv_sta, | |
168 | struct sk_buff *skb) | |
169 | { | |
170 | struct minstrel_sta_info *mi = priv_sta; | |
171 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
172 | struct ieee80211_tx_altrate *ar = info->status.retries; | |
173 | struct minstrel_priv *mp = priv; | |
174 | int i, ndx, tries; | |
175 | int success = 0; | |
176 | ||
177 | if (!info->status.excessive_retries) | |
178 | success = 1; | |
179 | ||
180 | if (!mp->has_mrr || (ar[0].rate_idx < 0)) { | |
181 | ndx = rix_to_ndx(mi, info->tx_rate_idx); | |
182 | tries = info->status.retry_count + 1; | |
183 | mi->r[ndx].success += success; | |
184 | mi->r[ndx].attempts += tries; | |
185 | return; | |
186 | } | |
187 | ||
188 | for (i = 0; i < 4; i++) { | |
189 | if (ar[i].rate_idx < 0) | |
190 | break; | |
191 | ||
192 | ndx = rix_to_ndx(mi, ar[i].rate_idx); | |
193 | mi->r[ndx].attempts += ar[i].limit + 1; | |
194 | ||
195 | if ((i != 3) && (ar[i + 1].rate_idx < 0)) | |
196 | mi->r[ndx].success += success; | |
197 | } | |
198 | ||
199 | if ((info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) && (i >= 0)) | |
200 | mi->sample_count++; | |
201 | ||
202 | if (mi->sample_deferred > 0) | |
203 | mi->sample_deferred--; | |
204 | } | |
205 | ||
206 | ||
207 | static inline unsigned int | |
208 | minstrel_get_retry_count(struct minstrel_rate *mr, | |
209 | struct ieee80211_tx_info *info) | |
210 | { | |
211 | unsigned int retry = mr->adjusted_retry_count; | |
212 | ||
213 | if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) | |
214 | retry = max(2U, min(mr->retry_count_rtscts, retry)); | |
215 | else if (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT) | |
216 | retry = max(2U, min(mr->retry_count_cts, retry)); | |
217 | return retry; | |
218 | } | |
219 | ||
220 | ||
221 | static int | |
222 | minstrel_get_next_sample(struct minstrel_sta_info *mi) | |
223 | { | |
224 | unsigned int sample_ndx; | |
225 | sample_ndx = SAMPLE_TBL(mi, mi->sample_idx, mi->sample_column); | |
226 | mi->sample_idx++; | |
227 | if (mi->sample_idx > (mi->n_rates - 2)) { | |
228 | mi->sample_idx = 0; | |
229 | mi->sample_column++; | |
230 | if (mi->sample_column >= SAMPLE_COLUMNS) | |
231 | mi->sample_column = 0; | |
232 | } | |
233 | return sample_ndx; | |
234 | } | |
235 | ||
236 | void | |
237 | minstrel_get_rate(void *priv, struct ieee80211_supported_band *sband, | |
238 | struct ieee80211_sta *sta, void *priv_sta, | |
239 | struct sk_buff *skb, struct rate_selection *sel) | |
240 | { | |
241 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
242 | struct minstrel_sta_info *mi = priv_sta; | |
243 | struct minstrel_priv *mp = priv; | |
244 | struct ieee80211_tx_altrate *ar = info->control.retries; | |
245 | unsigned int ndx, sample_ndx = 0; | |
246 | bool mrr; | |
247 | bool sample_slower = false; | |
248 | bool sample = false; | |
249 | int i, delta; | |
250 | int mrr_ndx[3]; | |
251 | int sample_rate; | |
252 | ||
253 | if (!sta || !mi || use_low_rate(skb)) { | |
254 | sel->rate_idx = rate_lowest_index(sband, sta); | |
255 | return; | |
256 | } | |
257 | ||
258 | mrr = mp->has_mrr; | |
259 | ||
260 | /* mac80211 does not allow mrr for RTS/CTS */ | |
261 | if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) || | |
262 | (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)) | |
263 | mrr = false; | |
264 | ||
265 | if (time_after(jiffies, mi->stats_update + (mp->update_interval * | |
266 | HZ) / 1000)) | |
267 | minstrel_update_stats(mp, mi); | |
268 | ||
269 | ndx = mi->max_tp_rate; | |
270 | ||
271 | if (mrr) | |
272 | sample_rate = mp->lookaround_rate_mrr; | |
273 | else | |
274 | sample_rate = mp->lookaround_rate; | |
275 | ||
276 | mi->packet_count++; | |
277 | delta = (mi->packet_count * sample_rate / 100) - | |
278 | (mi->sample_count + mi->sample_deferred / 2); | |
279 | ||
280 | /* delta > 0: sampling required */ | |
281 | if (delta > 0) { | |
282 | if (mi->packet_count >= 10000) { | |
283 | mi->sample_deferred = 0; | |
284 | mi->sample_count = 0; | |
285 | mi->packet_count = 0; | |
286 | } else if (delta > mi->n_rates * 2) { | |
287 | /* With multi-rate retry, not every planned sample | |
288 | * attempt actually gets used, due to the way the retry | |
289 | * chain is set up - [max_tp,sample,prob,lowest] for | |
290 | * sample_rate < max_tp. | |
291 | * | |
292 | * If there's too much sampling backlog and the link | |
293 | * starts getting worse, minstrel would start bursting | |
294 | * out lots of sampling frames, which would result | |
295 | * in a large throughput loss. */ | |
296 | mi->sample_count += (delta - mi->n_rates * 2); | |
297 | } | |
298 | ||
299 | sample_ndx = minstrel_get_next_sample(mi); | |
300 | sample = true; | |
301 | sample_slower = mrr && (mi->r[sample_ndx].perfect_tx_time > | |
302 | mi->r[ndx].perfect_tx_time); | |
303 | ||
304 | if (!sample_slower) { | |
305 | ndx = sample_ndx; | |
306 | mi->sample_count++; | |
307 | } else { | |
308 | /* Only use IEEE80211_TX_CTL_RATE_CTRL_PROBE to mark | |
309 | * packets that have the sampling rate deferred to the | |
310 | * second MRR stage. Increase the sample counter only | |
311 | * if the deferred sample rate was actually used. | |
312 | * Use the sample_deferred counter to make sure that | |
313 | * the sampling is not done in large bursts */ | |
314 | info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE; | |
315 | mi->sample_deferred++; | |
316 | } | |
317 | } | |
318 | sel->rate_idx = mi->r[ndx].rix; | |
319 | info->control.retry_limit = minstrel_get_retry_count(&mi->r[ndx], info); | |
320 | ||
321 | if (!mrr) { | |
322 | ar[0].rate_idx = mi->lowest_rix; | |
323 | ar[0].limit = mp->max_retry; | |
324 | ar[1].rate_idx = -1; | |
325 | return; | |
326 | } | |
327 | ||
328 | /* MRR setup */ | |
329 | if (sample) { | |
330 | if (sample_slower) | |
331 | mrr_ndx[0] = sample_ndx; | |
332 | else | |
333 | mrr_ndx[0] = mi->max_tp_rate; | |
334 | } else { | |
335 | mrr_ndx[0] = mi->max_tp_rate2; | |
336 | } | |
337 | mrr_ndx[1] = mi->max_prob_rate; | |
338 | mrr_ndx[2] = 0; | |
339 | for (i = 0; i < 3; i++) { | |
340 | ar[i].rate_idx = mi->r[mrr_ndx[i]].rix; | |
341 | ar[i].limit = mi->r[mrr_ndx[i]].adjusted_retry_count; | |
342 | } | |
343 | } | |
344 | ||
345 | ||
346 | static void | |
347 | calc_rate_durations(struct minstrel_sta_info *mi, struct ieee80211_local *local, | |
348 | struct minstrel_rate *d, struct ieee80211_rate *rate) | |
349 | { | |
350 | int erp = !!(rate->flags & IEEE80211_RATE_ERP_G); | |
351 | ||
352 | d->perfect_tx_time = ieee80211_frame_duration(local, 1200, | |
353 | rate->bitrate, erp, 1); | |
354 | d->ack_time = ieee80211_frame_duration(local, 10, | |
355 | rate->bitrate, erp, 1); | |
356 | } | |
357 | ||
358 | static void | |
359 | init_sample_table(struct minstrel_sta_info *mi) | |
360 | { | |
361 | unsigned int i, col, new_idx; | |
362 | unsigned int n_srates = mi->n_rates - 1; | |
363 | u8 rnd[8]; | |
364 | ||
365 | mi->sample_column = 0; | |
366 | mi->sample_idx = 0; | |
367 | memset(mi->sample_table, 0, SAMPLE_COLUMNS * mi->n_rates); | |
368 | ||
369 | for (col = 0; col < SAMPLE_COLUMNS; col++) { | |
370 | for (i = 0; i < n_srates; i++) { | |
371 | get_random_bytes(rnd, sizeof(rnd)); | |
372 | new_idx = (i + rnd[i & 7]) % n_srates; | |
373 | ||
374 | while (SAMPLE_TBL(mi, new_idx, col) != 0) | |
375 | new_idx = (new_idx + 1) % n_srates; | |
376 | ||
377 | /* Don't sample the slowest rate (i.e. slowest base | |
378 | * rate). We must presume that the slowest rate works | |
379 | * fine, or else other management frames will also be | |
380 | * failing and the link will break */ | |
381 | SAMPLE_TBL(mi, new_idx, col) = i + 1; | |
382 | } | |
383 | } | |
384 | } | |
385 | ||
386 | static void | |
387 | minstrel_rate_init(void *priv, struct ieee80211_supported_band *sband, | |
388 | struct ieee80211_sta *sta, void *priv_sta) | |
389 | { | |
390 | struct minstrel_sta_info *mi = priv_sta; | |
391 | struct minstrel_priv *mp = priv; | |
392 | struct minstrel_rate *mr_ctl; | |
393 | unsigned int i, n = 0; | |
394 | unsigned int t_slot = 9; /* FIXME: get real slot time */ | |
395 | ||
396 | mi->lowest_rix = rate_lowest_index(sband, sta); | |
397 | mr_ctl = &mi->r[rix_to_ndx(mi, mi->lowest_rix)]; | |
398 | mi->sp_ack_dur = mr_ctl->ack_time; | |
399 | ||
400 | for (i = 0; i < sband->n_bitrates; i++) { | |
401 | struct minstrel_rate *mr = &mi->r[n]; | |
402 | unsigned int tx_time = 0, tx_time_cts = 0, tx_time_rtscts = 0; | |
403 | unsigned int tx_time_single; | |
404 | unsigned int cw = mp->cw_min; | |
405 | ||
406 | if (!rate_supported(sta, sband->band, i)) | |
407 | continue; | |
408 | n++; | |
409 | memset(mr, 0, sizeof(*mr)); | |
410 | ||
411 | mr->rix = i; | |
412 | mr->bitrate = sband->bitrates[i].bitrate / 5; | |
413 | calc_rate_durations(mi, hw_to_local(mp->hw), mr, | |
414 | &sband->bitrates[i]); | |
415 | ||
416 | /* calculate maximum number of retransmissions before | |
417 | * fallback (based on maximum segment size) */ | |
418 | mr->retry_count = 1; | |
419 | mr->retry_count_cts = 1; | |
420 | mr->retry_count_rtscts = 1; | |
421 | tx_time = mr->perfect_tx_time + mi->sp_ack_dur; | |
422 | do { | |
423 | /* add one retransmission */ | |
424 | tx_time_single = mr->ack_time + mr->perfect_tx_time; | |
425 | ||
426 | /* contention window */ | |
427 | tx_time_single += t_slot + min(cw, mp->cw_max); | |
428 | cw = (cw + 1) << 1; | |
429 | ||
430 | tx_time += tx_time_single; | |
431 | tx_time_cts += tx_time_single + mi->sp_ack_dur; | |
432 | tx_time_rtscts += tx_time_single + 2 * mi->sp_ack_dur; | |
433 | if ((tx_time_cts < mp->segment_size) && | |
434 | (mr->retry_count_cts < mp->max_retry)) | |
435 | mr->retry_count_cts++; | |
436 | if ((tx_time_rtscts < mp->segment_size) && | |
437 | (mr->retry_count_rtscts < mp->max_retry)) | |
438 | mr->retry_count_rtscts++; | |
439 | } while ((tx_time < mp->segment_size) && | |
440 | (++mr->retry_count < mp->max_retry)); | |
441 | mr->adjusted_retry_count = mr->retry_count; | |
442 | } | |
443 | ||
444 | for (i = n; i < sband->n_bitrates; i++) { | |
445 | struct minstrel_rate *mr = &mi->r[i]; | |
446 | mr->rix = -1; | |
447 | } | |
448 | ||
449 | mi->n_rates = n; | |
450 | mi->stats_update = jiffies; | |
451 | ||
452 | init_sample_table(mi); | |
453 | } | |
454 | ||
455 | static void * | |
456 | minstrel_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp) | |
457 | { | |
458 | struct ieee80211_supported_band *sband; | |
459 | struct minstrel_sta_info *mi; | |
460 | struct minstrel_priv *mp = priv; | |
461 | struct ieee80211_hw *hw = mp->hw; | |
462 | int max_rates = 0; | |
463 | int i; | |
464 | ||
465 | mi = kzalloc(sizeof(struct minstrel_sta_info), gfp); | |
466 | if (!mi) | |
467 | return NULL; | |
468 | ||
469 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) { | |
470 | sband = hw->wiphy->bands[hw->conf.channel->band]; | |
471 | if (sband->n_bitrates > max_rates) | |
472 | max_rates = sband->n_bitrates; | |
473 | } | |
474 | ||
475 | mi->r = kzalloc(sizeof(struct minstrel_rate) * max_rates, gfp); | |
476 | if (!mi->r) | |
477 | goto error; | |
478 | ||
479 | mi->sample_table = kmalloc(SAMPLE_COLUMNS * max_rates, gfp); | |
480 | if (!mi->sample_table) | |
481 | goto error1; | |
482 | ||
483 | mi->stats_update = jiffies; | |
484 | return mi; | |
485 | ||
486 | error1: | |
487 | kfree(mi->r); | |
488 | error: | |
489 | kfree(mi); | |
490 | return NULL; | |
491 | } | |
492 | ||
493 | static void | |
494 | minstrel_free_sta(void *priv, struct ieee80211_sta *sta, void *priv_sta) | |
495 | { | |
496 | struct minstrel_sta_info *mi = priv_sta; | |
497 | ||
498 | kfree(mi->sample_table); | |
499 | kfree(mi->r); | |
500 | kfree(mi); | |
501 | } | |
502 | ||
503 | static void | |
504 | minstrel_clear(void *priv) | |
505 | { | |
506 | } | |
507 | ||
508 | static void * | |
509 | minstrel_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) | |
510 | { | |
511 | struct minstrel_priv *mp; | |
512 | ||
513 | mp = kzalloc(sizeof(struct minstrel_priv), GFP_ATOMIC); | |
514 | if (!mp) | |
515 | return NULL; | |
516 | ||
517 | /* contention window settings | |
518 | * Just an approximation. Using the per-queue values would complicate | |
519 | * the calculations and is probably unnecessary */ | |
520 | mp->cw_min = 15; | |
521 | mp->cw_max = 1023; | |
522 | ||
523 | /* number of packets (in %) to use for sampling other rates | |
524 | * sample less often for non-mrr packets, because the overhead | |
525 | * is much higher than with mrr */ | |
526 | mp->lookaround_rate = 5; | |
527 | mp->lookaround_rate_mrr = 10; | |
528 | ||
529 | /* moving average weight for EWMA */ | |
530 | mp->ewma_level = 75; | |
531 | ||
532 | /* maximum time that the hw is allowed to stay in one MRR segment */ | |
533 | mp->segment_size = 6000; | |
534 | ||
535 | if (hw->max_altrate_tries > 0) | |
536 | mp->max_retry = hw->max_altrate_tries; | |
537 | else | |
538 | /* safe default, does not necessarily have to match hw properties */ | |
539 | mp->max_retry = 7; | |
540 | ||
541 | if (hw->max_altrates >= 3) | |
542 | mp->has_mrr = true; | |
543 | ||
544 | mp->hw = hw; | |
545 | mp->update_interval = 100; | |
546 | ||
547 | return mp; | |
548 | } | |
549 | ||
550 | static void | |
551 | minstrel_free(void *priv) | |
552 | { | |
553 | kfree(priv); | |
554 | } | |
555 | ||
556 | static struct rate_control_ops mac80211_minstrel = { | |
557 | .name = "minstrel", | |
558 | .tx_status = minstrel_tx_status, | |
559 | .get_rate = minstrel_get_rate, | |
560 | .rate_init = minstrel_rate_init, | |
561 | .clear = minstrel_clear, | |
562 | .alloc = minstrel_alloc, | |
563 | .free = minstrel_free, | |
564 | .alloc_sta = minstrel_alloc_sta, | |
565 | .free_sta = minstrel_free_sta, | |
566 | #ifdef CONFIG_MAC80211_DEBUGFS | |
567 | .add_sta_debugfs = minstrel_add_sta_debugfs, | |
568 | .remove_sta_debugfs = minstrel_remove_sta_debugfs, | |
569 | #endif | |
570 | }; | |
571 | ||
572 | int __init | |
573 | rc80211_minstrel_init(void) | |
574 | { | |
575 | return ieee80211_rate_control_register(&mac80211_minstrel); | |
576 | } | |
577 | ||
578 | void | |
579 | rc80211_minstrel_exit(void) | |
580 | { | |
581 | ieee80211_rate_control_unregister(&mac80211_minstrel); | |
582 | } | |
583 |