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ad018375 MN |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005, Devicescape Software, Inc. | |
4 | * Copyright 2007, Mattias Nissler <mattias.nissler@gmx.de> | |
b7c50de9 | 5 | * Copyright 2007-2008, Stefano Brivio <stefano.brivio@polimi.it> |
ad018375 MN |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #include <linux/netdevice.h> | |
13 | #include <linux/types.h> | |
14 | #include <linux/skbuff.h> | |
4b475898 | 15 | #include <linux/debugfs.h> |
ad018375 | 16 | #include <net/mac80211.h> |
2c8dccc7 | 17 | #include "rate.h" |
ee385855 | 18 | #include "mesh.h" |
12446c67 MN |
19 | #include "rc80211_pid.h" |
20 | ||
ad018375 MN |
21 | |
22 | /* This is an implementation of a TX rate control algorithm that uses a PID | |
23 | * controller. Given a target failed frames rate, the controller decides about | |
24 | * TX rate changes to meet the target failed frames rate. | |
25 | * | |
26 | * The controller basically computes the following: | |
27 | * | |
1dc4d1e6 | 28 | * adj = CP * err + CI * err_avg + CD * (err - last_err) * (1 + sharpening) |
ad018375 MN |
29 | * |
30 | * where | |
31 | * adj adjustment value that is used to switch TX rate (see below) | |
32 | * err current error: target vs. current failed frames percentage | |
33 | * last_err last error | |
34 | * err_avg average (i.e. poor man's integral) of recent errors | |
1dc4d1e6 SB |
35 | * sharpening non-zero when fast response is needed (i.e. right after |
36 | * association or no frames sent for a long time), heading | |
37 | * to zero over time | |
ad018375 MN |
38 | * CP Proportional coefficient |
39 | * CI Integral coefficient | |
40 | * CD Derivative coefficient | |
41 | * | |
42 | * CP, CI, CD are subject to careful tuning. | |
43 | * | |
44 | * The integral component uses a exponential moving average approach instead of | |
45 | * an actual sliding window. The advantage is that we don't need to keep an | |
46 | * array of the last N error values and computation is easier. | |
47 | * | |
90d501d6 SB |
48 | * Once we have the adj value, we map it to a rate by means of a learning |
49 | * algorithm. This algorithm keeps the state of the percentual failed frames | |
50 | * difference between rates. The behaviour of the lowest available rate is kept | |
51 | * as a reference value, and every time we switch between two rates, we compute | |
52 | * the difference between the failed frames each rate exhibited. By doing so, | |
53 | * we compare behaviours which different rates exhibited in adjacent timeslices, | |
54 | * thus the comparison is minimally affected by external conditions. This | |
55 | * difference gets propagated to the whole set of measurements, so that the | |
56 | * reference is always the same. Periodically, we normalize this set so that | |
57 | * recent events weigh the most. By comparing the adj value with this set, we | |
58 | * avoid pejorative switches to lower rates and allow for switches to higher | |
59 | * rates if they behaved well. | |
ad018375 MN |
60 | * |
61 | * Note that for the computations we use a fixed-point representation to avoid | |
62 | * floating point arithmetic. Hence, all values are shifted left by | |
63 | * RC_PID_ARITH_SHIFT. | |
64 | */ | |
65 | ||
ad018375 | 66 | |
b7c50de9 SB |
67 | /* Adjust the rate while ensuring that we won't switch to a lower rate if it |
68 | * exhibited a worse failed frames behaviour and we'll choose the highest rate | |
69 | * whose failed frames behaviour is not worse than the one of the original rate | |
70 | * target. While at it, check that the new rate is valid. */ | |
4b7679a5 JB |
71 | static void rate_control_pid_adjust_rate(struct ieee80211_supported_band *sband, |
72 | struct ieee80211_sta *sta, | |
73 | struct rc_pid_sta_info *spinfo, int adj, | |
90d501d6 | 74 | struct rc_pid_rateinfo *rinfo) |
ad018375 | 75 | { |
b7c50de9 | 76 | int cur_sorted, new_sorted, probe, tmp, n_bitrates, band; |
ae17e986 | 77 | int cur = spinfo->txrate_idx; |
ad018375 | 78 | |
b7c50de9 SB |
79 | band = sband->band; |
80 | n_bitrates = sband->n_bitrates; | |
ad018375 | 81 | |
b7c50de9 SB |
82 | /* Map passed arguments to sorted values. */ |
83 | cur_sorted = rinfo[cur].rev_index; | |
84 | new_sorted = cur_sorted + adj; | |
ad018375 | 85 | |
b7c50de9 SB |
86 | /* Check limits. */ |
87 | if (new_sorted < 0) | |
88 | new_sorted = rinfo[0].rev_index; | |
89 | else if (new_sorted >= n_bitrates) | |
90 | new_sorted = rinfo[n_bitrates - 1].rev_index; | |
91 | ||
92 | tmp = new_sorted; | |
ad018375 | 93 | |
b7c50de9 SB |
94 | if (adj < 0) { |
95 | /* Ensure that the rate decrease isn't disadvantageous. */ | |
96 | for (probe = cur_sorted; probe >= new_sorted; probe--) | |
97 | if (rinfo[probe].diff <= rinfo[cur_sorted].diff && | |
98 | rate_supported(sta, band, rinfo[probe].index)) | |
99 | tmp = probe; | |
100 | } else { | |
101 | /* Look for rate increase with zero (or below) cost. */ | |
102 | for (probe = new_sorted + 1; probe < n_bitrates; probe++) | |
103 | if (rinfo[probe].diff <= rinfo[new_sorted].diff && | |
104 | rate_supported(sta, band, rinfo[probe].index)) | |
105 | tmp = probe; | |
ad018375 | 106 | } |
12446c67 | 107 | |
b7c50de9 SB |
108 | /* Fit the rate found to the nearest supported rate. */ |
109 | do { | |
110 | if (rate_supported(sta, band, rinfo[tmp].index)) { | |
ae17e986 | 111 | spinfo->txrate_idx = rinfo[tmp].index; |
b7c50de9 SB |
112 | break; |
113 | } | |
114 | if (adj < 0) | |
115 | tmp--; | |
116 | else | |
117 | tmp++; | |
118 | } while (tmp < n_bitrates && tmp >= 0); | |
119 | ||
12446c67 | 120 | #ifdef CONFIG_MAC80211_DEBUGFS |
ae17e986 JB |
121 | rate_control_pid_event_rate_change(&spinfo->events, |
122 | spinfo->txrate_idx, | |
123 | sband->bitrates[spinfo->txrate_idx].bitrate); | |
12446c67 | 124 | #endif |
ad018375 MN |
125 | } |
126 | ||
90d501d6 | 127 | /* Normalize the failed frames per-rate differences. */ |
1946b74c | 128 | static void rate_control_pid_normalize(struct rc_pid_info *pinfo, int l) |
90d501d6 | 129 | { |
1946b74c MN |
130 | int i, norm_offset = pinfo->norm_offset; |
131 | struct rc_pid_rateinfo *r = pinfo->rinfo; | |
90d501d6 | 132 | |
1946b74c MN |
133 | if (r[0].diff > norm_offset) |
134 | r[0].diff -= norm_offset; | |
135 | else if (r[0].diff < -norm_offset) | |
136 | r[0].diff += norm_offset; | |
90d501d6 | 137 | for (i = 0; i < l - 1; i++) |
1946b74c MN |
138 | if (r[i + 1].diff > r[i].diff + norm_offset) |
139 | r[i + 1].diff -= norm_offset; | |
90d501d6 | 140 | else if (r[i + 1].diff <= r[i].diff) |
1946b74c | 141 | r[i + 1].diff += norm_offset; |
90d501d6 SB |
142 | } |
143 | ||
ad018375 | 144 | static void rate_control_pid_sample(struct rc_pid_info *pinfo, |
4b7679a5 JB |
145 | struct ieee80211_supported_band *sband, |
146 | struct ieee80211_sta *sta, | |
147 | struct rc_pid_sta_info *spinfo) | |
ad018375 | 148 | { |
90d501d6 | 149 | struct rc_pid_rateinfo *rinfo = pinfo->rinfo; |
ad018375 MN |
150 | u32 pf; |
151 | s32 err_avg; | |
1946b74c MN |
152 | u32 err_prop; |
153 | u32 err_int; | |
154 | u32 err_der; | |
90d501d6 | 155 | int adj, i, j, tmp; |
1946b74c | 156 | unsigned long period; |
ad018375 | 157 | |
1dc4d1e6 SB |
158 | /* In case nothing happened during the previous control interval, turn |
159 | * the sharpening factor on. */ | |
1946b74c MN |
160 | period = (HZ * pinfo->sampling_period + 500) / 1000; |
161 | if (!period) | |
162 | period = 1; | |
163 | if (jiffies - spinfo->last_sample > 2 * period) | |
164 | spinfo->sharp_cnt = pinfo->sharpen_duration; | |
1dc4d1e6 | 165 | |
ad018375 MN |
166 | spinfo->last_sample = jiffies; |
167 | ||
1dc4d1e6 | 168 | /* This should never happen, but in case, we assume the old sample is |
ad018375 | 169 | * still a good measurement and copy it. */ |
1dc4d1e6 | 170 | if (unlikely(spinfo->tx_num_xmit == 0)) |
ad018375 | 171 | pf = spinfo->last_pf; |
bfc32e6a | 172 | else |
ad018375 | 173 | pf = spinfo->tx_num_failed * 100 / spinfo->tx_num_xmit; |
4b7679a5 | 174 | |
1dc4d1e6 SB |
175 | spinfo->tx_num_xmit = 0; |
176 | spinfo->tx_num_failed = 0; | |
177 | ||
90d501d6 | 178 | /* If we just switched rate, update the rate behaviour info. */ |
ae17e986 | 179 | if (pinfo->oldrate != spinfo->txrate_idx) { |
90d501d6 SB |
180 | |
181 | i = rinfo[pinfo->oldrate].rev_index; | |
ae17e986 | 182 | j = rinfo[spinfo->txrate_idx].rev_index; |
90d501d6 SB |
183 | |
184 | tmp = (pf - spinfo->last_pf); | |
185 | tmp = RC_PID_DO_ARITH_RIGHT_SHIFT(tmp, RC_PID_ARITH_SHIFT); | |
186 | ||
187 | rinfo[j].diff = rinfo[i].diff + tmp; | |
ae17e986 | 188 | pinfo->oldrate = spinfo->txrate_idx; |
90d501d6 | 189 | } |
8318d78a | 190 | rate_control_pid_normalize(pinfo, sband->n_bitrates); |
90d501d6 | 191 | |
ad018375 | 192 | /* Compute the proportional, integral and derivative errors. */ |
e850f68b | 193 | err_prop = (pinfo->target - pf) << RC_PID_ARITH_SHIFT; |
ad018375 | 194 | |
1946b74c | 195 | err_avg = spinfo->err_avg_sc >> pinfo->smoothing_shift; |
ad018375 | 196 | spinfo->err_avg_sc = spinfo->err_avg_sc - err_avg + err_prop; |
1946b74c | 197 | err_int = spinfo->err_avg_sc >> pinfo->smoothing_shift; |
ad018375 | 198 | |
1946b74c MN |
199 | err_der = (pf - spinfo->last_pf) * |
200 | (1 + pinfo->sharpen_factor * spinfo->sharp_cnt); | |
ad018375 | 201 | spinfo->last_pf = pf; |
1dc4d1e6 SB |
202 | if (spinfo->sharp_cnt) |
203 | spinfo->sharp_cnt--; | |
ad018375 | 204 | |
12446c67 MN |
205 | #ifdef CONFIG_MAC80211_DEBUGFS |
206 | rate_control_pid_event_pf_sample(&spinfo->events, pf, err_prop, err_int, | |
207 | err_der); | |
208 | #endif | |
209 | ||
ad018375 MN |
210 | /* Compute the controller output. */ |
211 | adj = (err_prop * pinfo->coeff_p + err_int * pinfo->coeff_i | |
212 | + err_der * pinfo->coeff_d); | |
90d501d6 | 213 | adj = RC_PID_DO_ARITH_RIGHT_SHIFT(adj, 2 * RC_PID_ARITH_SHIFT); |
ad018375 MN |
214 | |
215 | /* Change rate. */ | |
216 | if (adj) | |
4b7679a5 | 217 | rate_control_pid_adjust_rate(sband, sta, spinfo, adj, rinfo); |
ad018375 MN |
218 | } |
219 | ||
4b7679a5 JB |
220 | static void rate_control_pid_tx_status(void *priv, struct ieee80211_supported_band *sband, |
221 | struct ieee80211_sta *sta, void *priv_sta, | |
e039fa4a | 222 | struct sk_buff *skb) |
ad018375 | 223 | { |
ad018375 | 224 | struct rc_pid_info *pinfo = priv; |
4b7679a5 | 225 | struct rc_pid_sta_info *spinfo = priv_sta; |
1946b74c | 226 | unsigned long period; |
e039fa4a | 227 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
ad018375 | 228 | |
4b7679a5 JB |
229 | if (!spinfo) |
230 | return; | |
df26e7ea | 231 | |
ad018375 MN |
232 | /* Ignore all frames that were sent with a different rate than the rate |
233 | * we currently advise mac80211 to use. */ | |
e6a9854b | 234 | if (info->status.rates[0].idx != spinfo->txrate_idx) |
4b7679a5 | 235 | return; |
ad018375 | 236 | |
ad018375 MN |
237 | spinfo->tx_num_xmit++; |
238 | ||
12446c67 | 239 | #ifdef CONFIG_MAC80211_DEBUGFS |
e039fa4a | 240 | rate_control_pid_event_tx_status(&spinfo->events, info); |
12446c67 MN |
241 | #endif |
242 | ||
ad018375 MN |
243 | /* We count frames that totally failed to be transmitted as two bad |
244 | * frames, those that made it out but had some retries as one good and | |
245 | * one bad frame. */ | |
e6a9854b | 246 | if (!(info->flags & IEEE80211_TX_STAT_ACK)) { |
ad018375 MN |
247 | spinfo->tx_num_failed += 2; |
248 | spinfo->tx_num_xmit++; | |
1dc5a841 | 249 | } else if (info->status.rates[0].count > 1) { |
ad018375 MN |
250 | spinfo->tx_num_failed++; |
251 | spinfo->tx_num_xmit++; | |
252 | } | |
253 | ||
ad018375 | 254 | /* Update PID controller state. */ |
1946b74c MN |
255 | period = (HZ * pinfo->sampling_period + 500) / 1000; |
256 | if (!period) | |
257 | period = 1; | |
258 | if (time_after(jiffies, spinfo->last_sample + period)) | |
4b7679a5 | 259 | rate_control_pid_sample(pinfo, sband, sta, spinfo); |
ad018375 MN |
260 | } |
261 | ||
4b7679a5 | 262 | static void |
e6a9854b JB |
263 | rate_control_pid_get_rate(void *priv, struct ieee80211_sta *sta, |
264 | void *priv_sta, | |
265 | struct ieee80211_tx_rate_control *txrc) | |
ad018375 | 266 | { |
e6a9854b JB |
267 | struct sk_buff *skb = txrc->skb; |
268 | struct ieee80211_supported_band *sband = txrc->sband; | |
e6a9854b | 269 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
4b7679a5 | 270 | struct rc_pid_sta_info *spinfo = priv_sta; |
ad018375 MN |
271 | int rateidx; |
272 | ||
e6a9854b JB |
273 | if (txrc->rts) |
274 | info->control.rates[0].count = | |
275 | txrc->hw->conf.long_frame_max_tx_count; | |
276 | else | |
277 | info->control.rates[0].count = | |
278 | txrc->hw->conf.short_frame_max_tx_count; | |
279 | ||
92236841 | 280 | /* Send management frames and NO_ACK data using lowest rate. */ |
4c6d4f5c | 281 | if (rate_control_send_low(sta, priv_sta, txrc)) |
ad018375 | 282 | return; |
ad018375 | 283 | |
ae17e986 | 284 | rateidx = spinfo->txrate_idx; |
ad018375 | 285 | |
8318d78a JB |
286 | if (rateidx >= sband->n_bitrates) |
287 | rateidx = sband->n_bitrates - 1; | |
ad018375 | 288 | |
e6a9854b | 289 | info->control.rates[0].idx = rateidx; |
12446c67 MN |
290 | |
291 | #ifdef CONFIG_MAC80211_DEBUGFS | |
4b7679a5 | 292 | rate_control_pid_event_tx_rate(&spinfo->events, |
8318d78a | 293 | rateidx, sband->bitrates[rateidx].bitrate); |
12446c67 | 294 | #endif |
ad018375 MN |
295 | } |
296 | ||
4b7679a5 JB |
297 | static void |
298 | rate_control_pid_rate_init(void *priv, struct ieee80211_supported_band *sband, | |
299 | struct ieee80211_sta *sta, void *priv_sta) | |
ad018375 | 300 | { |
4b7679a5 | 301 | struct rc_pid_sta_info *spinfo = priv_sta; |
6909268d JS |
302 | struct rc_pid_info *pinfo = priv; |
303 | struct rc_pid_rateinfo *rinfo = pinfo->rinfo; | |
6909268d JS |
304 | int i, j, tmp; |
305 | bool s; | |
4b7679a5 | 306 | |
ad018375 MN |
307 | /* TODO: This routine should consider using RSSI from previous packets |
308 | * as we need to have IEEE 802.1X auth succeed immediately after assoc.. | |
309 | * Until that method is implemented, we will use the lowest supported | |
310 | * rate as a workaround. */ | |
8318d78a | 311 | |
6909268d JS |
312 | /* Sort the rates. This is optimized for the most common case (i.e. |
313 | * almost-sorted CCK+OFDM rates). Kind of bubble-sort with reversed | |
314 | * mapping too. */ | |
315 | for (i = 0; i < sband->n_bitrates; i++) { | |
316 | rinfo[i].index = i; | |
317 | rinfo[i].rev_index = i; | |
318 | if (RC_PID_FAST_START) | |
319 | rinfo[i].diff = 0; | |
320 | else | |
321 | rinfo[i].diff = i * pinfo->norm_offset; | |
322 | } | |
323 | for (i = 1; i < sband->n_bitrates; i++) { | |
324 | s = 0; | |
325 | for (j = 0; j < sband->n_bitrates - i; j++) | |
326 | if (unlikely(sband->bitrates[rinfo[j].index].bitrate > | |
327 | sband->bitrates[rinfo[j + 1].index].bitrate)) { | |
328 | tmp = rinfo[j].index; | |
329 | rinfo[j].index = rinfo[j + 1].index; | |
330 | rinfo[j + 1].index = tmp; | |
331 | rinfo[rinfo[j].index].rev_index = j; | |
332 | rinfo[rinfo[j + 1].index].rev_index = j + 1; | |
333 | s = 1; | |
334 | } | |
335 | if (!s) | |
336 | break; | |
337 | } | |
338 | ||
4b7679a5 | 339 | spinfo->txrate_idx = rate_lowest_index(sband, sta); |
ad018375 MN |
340 | } |
341 | ||
4b7679a5 JB |
342 | static void *rate_control_pid_alloc(struct ieee80211_hw *hw, |
343 | struct dentry *debugfsdir) | |
ad018375 MN |
344 | { |
345 | struct rc_pid_info *pinfo; | |
90d501d6 | 346 | struct rc_pid_rateinfo *rinfo; |
8318d78a | 347 | struct ieee80211_supported_band *sband; |
6909268d | 348 | int i, max_rates = 0; |
1946b74c MN |
349 | #ifdef CONFIG_MAC80211_DEBUGFS |
350 | struct rc_pid_debugfs_entries *de; | |
351 | #endif | |
ad018375 MN |
352 | |
353 | pinfo = kmalloc(sizeof(*pinfo), GFP_ATOMIC); | |
90d501d6 SB |
354 | if (!pinfo) |
355 | return NULL; | |
356 | ||
6909268d JS |
357 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) { |
358 | sband = hw->wiphy->bands[i]; | |
621ad7c9 | 359 | if (sband && sband->n_bitrates > max_rates) |
6909268d JS |
360 | max_rates = sband->n_bitrates; |
361 | } | |
362 | ||
363 | rinfo = kmalloc(sizeof(*rinfo) * max_rates, GFP_ATOMIC); | |
90d501d6 SB |
364 | if (!rinfo) { |
365 | kfree(pinfo); | |
366 | return NULL; | |
367 | } | |
368 | ||
adeed480 MN |
369 | pinfo->target = RC_PID_TARGET_PF; |
370 | pinfo->sampling_period = RC_PID_INTERVAL; | |
371 | pinfo->coeff_p = RC_PID_COEFF_P; | |
372 | pinfo->coeff_i = RC_PID_COEFF_I; | |
373 | pinfo->coeff_d = RC_PID_COEFF_D; | |
374 | pinfo->smoothing_shift = RC_PID_SMOOTHING_SHIFT; | |
375 | pinfo->sharpen_factor = RC_PID_SHARPENING_FACTOR; | |
376 | pinfo->sharpen_duration = RC_PID_SHARPENING_DURATION; | |
377 | pinfo->norm_offset = RC_PID_NORM_OFFSET; | |
378 | pinfo->rinfo = rinfo; | |
379 | pinfo->oldrate = 0; | |
380 | ||
1946b74c MN |
381 | #ifdef CONFIG_MAC80211_DEBUGFS |
382 | de = &pinfo->dentries; | |
1946b74c | 383 | de->target = debugfs_create_u32("target_pf", S_IRUSR | S_IWUSR, |
4b7679a5 | 384 | debugfsdir, &pinfo->target); |
1946b74c | 385 | de->sampling_period = debugfs_create_u32("sampling_period", |
4b7679a5 | 386 | S_IRUSR | S_IWUSR, debugfsdir, |
1946b74c MN |
387 | &pinfo->sampling_period); |
388 | de->coeff_p = debugfs_create_u32("coeff_p", S_IRUSR | S_IWUSR, | |
9902b184 | 389 | debugfsdir, (u32 *)&pinfo->coeff_p); |
1946b74c | 390 | de->coeff_i = debugfs_create_u32("coeff_i", S_IRUSR | S_IWUSR, |
9902b184 | 391 | debugfsdir, (u32 *)&pinfo->coeff_i); |
1946b74c | 392 | de->coeff_d = debugfs_create_u32("coeff_d", S_IRUSR | S_IWUSR, |
9902b184 | 393 | debugfsdir, (u32 *)&pinfo->coeff_d); |
1946b74c | 394 | de->smoothing_shift = debugfs_create_u32("smoothing_shift", |
4b7679a5 | 395 | S_IRUSR | S_IWUSR, debugfsdir, |
1946b74c MN |
396 | &pinfo->smoothing_shift); |
397 | de->sharpen_factor = debugfs_create_u32("sharpen_factor", | |
4b7679a5 | 398 | S_IRUSR | S_IWUSR, debugfsdir, |
1946b74c MN |
399 | &pinfo->sharpen_factor); |
400 | de->sharpen_duration = debugfs_create_u32("sharpen_duration", | |
4b7679a5 | 401 | S_IRUSR | S_IWUSR, debugfsdir, |
1946b74c MN |
402 | &pinfo->sharpen_duration); |
403 | de->norm_offset = debugfs_create_u32("norm_offset", | |
4b7679a5 | 404 | S_IRUSR | S_IWUSR, debugfsdir, |
1946b74c | 405 | &pinfo->norm_offset); |
1946b74c MN |
406 | #endif |
407 | ||
ad018375 MN |
408 | return pinfo; |
409 | } | |
410 | ||
411 | static void rate_control_pid_free(void *priv) | |
412 | { | |
413 | struct rc_pid_info *pinfo = priv; | |
1946b74c MN |
414 | #ifdef CONFIG_MAC80211_DEBUGFS |
415 | struct rc_pid_debugfs_entries *de = &pinfo->dentries; | |
416 | ||
1946b74c MN |
417 | debugfs_remove(de->norm_offset); |
418 | debugfs_remove(de->sharpen_duration); | |
419 | debugfs_remove(de->sharpen_factor); | |
420 | debugfs_remove(de->smoothing_shift); | |
421 | debugfs_remove(de->coeff_d); | |
422 | debugfs_remove(de->coeff_i); | |
423 | debugfs_remove(de->coeff_p); | |
424 | debugfs_remove(de->sampling_period); | |
425 | debugfs_remove(de->target); | |
1946b74c MN |
426 | #endif |
427 | ||
90d501d6 | 428 | kfree(pinfo->rinfo); |
ad018375 MN |
429 | kfree(pinfo); |
430 | } | |
431 | ||
4b7679a5 JB |
432 | static void *rate_control_pid_alloc_sta(void *priv, struct ieee80211_sta *sta, |
433 | gfp_t gfp) | |
ad018375 MN |
434 | { |
435 | struct rc_pid_sta_info *spinfo; | |
436 | ||
437 | spinfo = kzalloc(sizeof(*spinfo), gfp); | |
12446c67 MN |
438 | if (spinfo == NULL) |
439 | return NULL; | |
440 | ||
c09c7237 SB |
441 | spinfo->last_sample = jiffies; |
442 | ||
12446c67 MN |
443 | #ifdef CONFIG_MAC80211_DEBUGFS |
444 | spin_lock_init(&spinfo->events.lock); | |
445 | init_waitqueue_head(&spinfo->events.waitqueue); | |
446 | #endif | |
ad018375 MN |
447 | |
448 | return spinfo; | |
449 | } | |
450 | ||
4b7679a5 JB |
451 | static void rate_control_pid_free_sta(void *priv, struct ieee80211_sta *sta, |
452 | void *priv_sta) | |
ad018375 | 453 | { |
4b7679a5 | 454 | kfree(priv_sta); |
ad018375 MN |
455 | } |
456 | ||
4b475898 | 457 | static struct rate_control_ops mac80211_rcpid = { |
ad018375 MN |
458 | .name = "pid", |
459 | .tx_status = rate_control_pid_tx_status, | |
460 | .get_rate = rate_control_pid_get_rate, | |
461 | .rate_init = rate_control_pid_rate_init, | |
ad018375 MN |
462 | .alloc = rate_control_pid_alloc, |
463 | .free = rate_control_pid_free, | |
464 | .alloc_sta = rate_control_pid_alloc_sta, | |
465 | .free_sta = rate_control_pid_free_sta, | |
12446c67 MN |
466 | #ifdef CONFIG_MAC80211_DEBUGFS |
467 | .add_sta_debugfs = rate_control_pid_add_sta_debugfs, | |
468 | .remove_sta_debugfs = rate_control_pid_remove_sta_debugfs, | |
469 | #endif | |
ad018375 | 470 | }; |
4b475898 | 471 | |
4b475898 JB |
472 | int __init rc80211_pid_init(void) |
473 | { | |
474 | return ieee80211_rate_control_register(&mac80211_rcpid); | |
475 | } | |
476 | ||
f0b9205c | 477 | void rc80211_pid_exit(void) |
4b475898 JB |
478 | { |
479 | ieee80211_rate_control_unregister(&mac80211_rcpid); | |
480 | } |