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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 MN |
171 | pf = spinfo->last_pf; |
172 | else { | |
4b7679a5 JB |
173 | /* XXX: BAD HACK!!! */ |
174 | struct sta_info *si = container_of(sta, struct sta_info, sta); | |
175 | ||
ad018375 | 176 | pf = spinfo->tx_num_failed * 100 / spinfo->tx_num_xmit; |
4b7679a5 JB |
177 | |
178 | if (ieee80211_vif_is_mesh(&si->sdata->vif) && pf == 100) | |
179 | mesh_plink_broken(si); | |
ad018375 | 180 | pf <<= RC_PID_ARITH_SHIFT; |
4b7679a5 | 181 | si->fail_avg = ((pf + (spinfo->last_pf << 3)) / 9) |
ee385855 | 182 | >> RC_PID_ARITH_SHIFT; |
ad018375 MN |
183 | } |
184 | ||
1dc4d1e6 SB |
185 | spinfo->tx_num_xmit = 0; |
186 | spinfo->tx_num_failed = 0; | |
187 | ||
90d501d6 | 188 | /* If we just switched rate, update the rate behaviour info. */ |
ae17e986 | 189 | if (pinfo->oldrate != spinfo->txrate_idx) { |
90d501d6 SB |
190 | |
191 | i = rinfo[pinfo->oldrate].rev_index; | |
ae17e986 | 192 | j = rinfo[spinfo->txrate_idx].rev_index; |
90d501d6 SB |
193 | |
194 | tmp = (pf - spinfo->last_pf); | |
195 | tmp = RC_PID_DO_ARITH_RIGHT_SHIFT(tmp, RC_PID_ARITH_SHIFT); | |
196 | ||
197 | rinfo[j].diff = rinfo[i].diff + tmp; | |
ae17e986 | 198 | pinfo->oldrate = spinfo->txrate_idx; |
90d501d6 | 199 | } |
8318d78a | 200 | rate_control_pid_normalize(pinfo, sband->n_bitrates); |
90d501d6 | 201 | |
ad018375 | 202 | /* Compute the proportional, integral and derivative errors. */ |
426706c0 | 203 | err_prop = (pinfo->target << RC_PID_ARITH_SHIFT) - pf; |
ad018375 | 204 | |
1946b74c | 205 | err_avg = spinfo->err_avg_sc >> pinfo->smoothing_shift; |
ad018375 | 206 | spinfo->err_avg_sc = spinfo->err_avg_sc - err_avg + err_prop; |
1946b74c | 207 | err_int = spinfo->err_avg_sc >> pinfo->smoothing_shift; |
ad018375 | 208 | |
1946b74c MN |
209 | err_der = (pf - spinfo->last_pf) * |
210 | (1 + pinfo->sharpen_factor * spinfo->sharp_cnt); | |
ad018375 | 211 | spinfo->last_pf = pf; |
1dc4d1e6 SB |
212 | if (spinfo->sharp_cnt) |
213 | spinfo->sharp_cnt--; | |
ad018375 | 214 | |
12446c67 MN |
215 | #ifdef CONFIG_MAC80211_DEBUGFS |
216 | rate_control_pid_event_pf_sample(&spinfo->events, pf, err_prop, err_int, | |
217 | err_der); | |
218 | #endif | |
219 | ||
ad018375 MN |
220 | /* Compute the controller output. */ |
221 | adj = (err_prop * pinfo->coeff_p + err_int * pinfo->coeff_i | |
222 | + err_der * pinfo->coeff_d); | |
90d501d6 | 223 | adj = RC_PID_DO_ARITH_RIGHT_SHIFT(adj, 2 * RC_PID_ARITH_SHIFT); |
ad018375 MN |
224 | |
225 | /* Change rate. */ | |
226 | if (adj) | |
4b7679a5 | 227 | rate_control_pid_adjust_rate(sband, sta, spinfo, adj, rinfo); |
ad018375 MN |
228 | } |
229 | ||
4b7679a5 JB |
230 | static void rate_control_pid_tx_status(void *priv, struct ieee80211_supported_band *sband, |
231 | struct ieee80211_sta *sta, void *priv_sta, | |
e039fa4a | 232 | struct sk_buff *skb) |
ad018375 | 233 | { |
ad018375 | 234 | struct rc_pid_info *pinfo = priv; |
4b7679a5 | 235 | struct rc_pid_sta_info *spinfo = priv_sta; |
1946b74c | 236 | unsigned long period; |
e039fa4a | 237 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
ad018375 | 238 | |
4b7679a5 JB |
239 | if (!spinfo) |
240 | return; | |
df26e7ea | 241 | |
ad018375 MN |
242 | /* Ignore all frames that were sent with a different rate than the rate |
243 | * we currently advise mac80211 to use. */ | |
e6a9854b | 244 | if (info->status.rates[0].idx != spinfo->txrate_idx) |
4b7679a5 | 245 | return; |
ad018375 | 246 | |
ad018375 MN |
247 | spinfo->tx_num_xmit++; |
248 | ||
12446c67 | 249 | #ifdef CONFIG_MAC80211_DEBUGFS |
e039fa4a | 250 | rate_control_pid_event_tx_status(&spinfo->events, info); |
12446c67 MN |
251 | #endif |
252 | ||
ad018375 MN |
253 | /* We count frames that totally failed to be transmitted as two bad |
254 | * frames, those that made it out but had some retries as one good and | |
255 | * one bad frame. */ | |
e6a9854b | 256 | if (!(info->flags & IEEE80211_TX_STAT_ACK)) { |
ad018375 MN |
257 | spinfo->tx_num_failed += 2; |
258 | spinfo->tx_num_xmit++; | |
1dc5a841 | 259 | } else if (info->status.rates[0].count > 1) { |
ad018375 MN |
260 | spinfo->tx_num_failed++; |
261 | spinfo->tx_num_xmit++; | |
262 | } | |
263 | ||
ad018375 | 264 | /* Update PID controller state. */ |
1946b74c MN |
265 | period = (HZ * pinfo->sampling_period + 500) / 1000; |
266 | if (!period) | |
267 | period = 1; | |
268 | if (time_after(jiffies, spinfo->last_sample + period)) | |
4b7679a5 | 269 | rate_control_pid_sample(pinfo, sband, sta, spinfo); |
ad018375 MN |
270 | } |
271 | ||
4b7679a5 | 272 | static void |
e6a9854b JB |
273 | rate_control_pid_get_rate(void *priv, struct ieee80211_sta *sta, |
274 | void *priv_sta, | |
275 | struct ieee80211_tx_rate_control *txrc) | |
ad018375 | 276 | { |
e6a9854b JB |
277 | struct sk_buff *skb = txrc->skb; |
278 | struct ieee80211_supported_band *sband = txrc->sband; | |
ad018375 | 279 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
e6a9854b | 280 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
4b7679a5 | 281 | struct rc_pid_sta_info *spinfo = priv_sta; |
ad018375 | 282 | int rateidx; |
2bc454b0 | 283 | u16 fc; |
ad018375 | 284 | |
e6a9854b JB |
285 | if (txrc->rts) |
286 | info->control.rates[0].count = | |
287 | txrc->hw->conf.long_frame_max_tx_count; | |
288 | else | |
289 | info->control.rates[0].count = | |
290 | txrc->hw->conf.short_frame_max_tx_count; | |
291 | ||
2bc454b0 MW |
292 | /* Send management frames and broadcast/multicast data using lowest |
293 | * rate. */ | |
294 | fc = le16_to_cpu(hdr->frame_control); | |
4b7679a5 JB |
295 | if (!sta || !spinfo || |
296 | (fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA || | |
297 | is_multicast_ether_addr(hdr->addr1)) { | |
e6a9854b | 298 | info->control.rates[0].idx = rate_lowest_index(sband, sta); |
ad018375 MN |
299 | return; |
300 | } | |
301 | ||
ae17e986 | 302 | rateidx = spinfo->txrate_idx; |
ad018375 | 303 | |
8318d78a JB |
304 | if (rateidx >= sband->n_bitrates) |
305 | rateidx = sband->n_bitrates - 1; | |
ad018375 | 306 | |
e6a9854b | 307 | info->control.rates[0].idx = rateidx; |
12446c67 MN |
308 | |
309 | #ifdef CONFIG_MAC80211_DEBUGFS | |
4b7679a5 | 310 | rate_control_pid_event_tx_rate(&spinfo->events, |
8318d78a | 311 | rateidx, sband->bitrates[rateidx].bitrate); |
12446c67 | 312 | #endif |
ad018375 MN |
313 | } |
314 | ||
4b7679a5 JB |
315 | static void |
316 | rate_control_pid_rate_init(void *priv, struct ieee80211_supported_band *sband, | |
317 | struct ieee80211_sta *sta, void *priv_sta) | |
ad018375 | 318 | { |
4b7679a5 JB |
319 | struct rc_pid_sta_info *spinfo = priv_sta; |
320 | struct sta_info *si; | |
321 | ||
ad018375 MN |
322 | /* TODO: This routine should consider using RSSI from previous packets |
323 | * as we need to have IEEE 802.1X auth succeed immediately after assoc.. | |
324 | * Until that method is implemented, we will use the lowest supported | |
325 | * rate as a workaround. */ | |
8318d78a | 326 | |
4b7679a5 JB |
327 | spinfo->txrate_idx = rate_lowest_index(sband, sta); |
328 | /* HACK */ | |
329 | si = container_of(sta, struct sta_info, sta); | |
330 | si->fail_avg = 0; | |
ad018375 MN |
331 | } |
332 | ||
4b7679a5 JB |
333 | static void *rate_control_pid_alloc(struct ieee80211_hw *hw, |
334 | struct dentry *debugfsdir) | |
ad018375 MN |
335 | { |
336 | struct rc_pid_info *pinfo; | |
90d501d6 | 337 | struct rc_pid_rateinfo *rinfo; |
8318d78a | 338 | struct ieee80211_supported_band *sband; |
90d501d6 SB |
339 | int i, j, tmp; |
340 | bool s; | |
1946b74c MN |
341 | #ifdef CONFIG_MAC80211_DEBUGFS |
342 | struct rc_pid_debugfs_entries *de; | |
343 | #endif | |
ad018375 | 344 | |
4b7679a5 | 345 | sband = hw->wiphy->bands[hw->conf.channel->band]; |
8318d78a | 346 | |
ad018375 | 347 | pinfo = kmalloc(sizeof(*pinfo), GFP_ATOMIC); |
90d501d6 SB |
348 | if (!pinfo) |
349 | return NULL; | |
350 | ||
8318d78a | 351 | /* We can safely assume that sband won't change unless we get |
90d501d6 | 352 | * reinitialized. */ |
8318d78a | 353 | rinfo = kmalloc(sizeof(*rinfo) * sband->n_bitrates, GFP_ATOMIC); |
90d501d6 SB |
354 | if (!rinfo) { |
355 | kfree(pinfo); | |
356 | return NULL; | |
357 | } | |
358 | ||
adeed480 MN |
359 | pinfo->target = RC_PID_TARGET_PF; |
360 | pinfo->sampling_period = RC_PID_INTERVAL; | |
361 | pinfo->coeff_p = RC_PID_COEFF_P; | |
362 | pinfo->coeff_i = RC_PID_COEFF_I; | |
363 | pinfo->coeff_d = RC_PID_COEFF_D; | |
364 | pinfo->smoothing_shift = RC_PID_SMOOTHING_SHIFT; | |
365 | pinfo->sharpen_factor = RC_PID_SHARPENING_FACTOR; | |
366 | pinfo->sharpen_duration = RC_PID_SHARPENING_DURATION; | |
367 | pinfo->norm_offset = RC_PID_NORM_OFFSET; | |
368 | pinfo->rinfo = rinfo; | |
369 | pinfo->oldrate = 0; | |
370 | ||
90d501d6 SB |
371 | /* Sort the rates. This is optimized for the most common case (i.e. |
372 | * almost-sorted CCK+OFDM rates). Kind of bubble-sort with reversed | |
373 | * mapping too. */ | |
8318d78a | 374 | for (i = 0; i < sband->n_bitrates; i++) { |
90d501d6 SB |
375 | rinfo[i].index = i; |
376 | rinfo[i].rev_index = i; | |
adeed480 | 377 | if (RC_PID_FAST_START) |
90d501d6 SB |
378 | rinfo[i].diff = 0; |
379 | else | |
1946b74c | 380 | rinfo[i].diff = i * pinfo->norm_offset; |
90d501d6 | 381 | } |
8318d78a | 382 | for (i = 1; i < sband->n_bitrates; i++) { |
90d501d6 | 383 | s = 0; |
8318d78a JB |
384 | for (j = 0; j < sband->n_bitrates - i; j++) |
385 | if (unlikely(sband->bitrates[rinfo[j].index].bitrate > | |
386 | sband->bitrates[rinfo[j + 1].index].bitrate)) { | |
90d501d6 SB |
387 | tmp = rinfo[j].index; |
388 | rinfo[j].index = rinfo[j + 1].index; | |
389 | rinfo[j + 1].index = tmp; | |
390 | rinfo[rinfo[j].index].rev_index = j; | |
391 | rinfo[rinfo[j + 1].index].rev_index = j + 1; | |
392 | s = 1; | |
393 | } | |
394 | if (!s) | |
395 | break; | |
396 | } | |
ad018375 | 397 | |
1946b74c MN |
398 | #ifdef CONFIG_MAC80211_DEBUGFS |
399 | de = &pinfo->dentries; | |
1946b74c | 400 | de->target = debugfs_create_u32("target_pf", S_IRUSR | S_IWUSR, |
4b7679a5 | 401 | debugfsdir, &pinfo->target); |
1946b74c | 402 | de->sampling_period = debugfs_create_u32("sampling_period", |
4b7679a5 | 403 | S_IRUSR | S_IWUSR, debugfsdir, |
1946b74c MN |
404 | &pinfo->sampling_period); |
405 | de->coeff_p = debugfs_create_u32("coeff_p", S_IRUSR | S_IWUSR, | |
9902b184 | 406 | debugfsdir, (u32 *)&pinfo->coeff_p); |
1946b74c | 407 | de->coeff_i = debugfs_create_u32("coeff_i", S_IRUSR | S_IWUSR, |
9902b184 | 408 | debugfsdir, (u32 *)&pinfo->coeff_i); |
1946b74c | 409 | de->coeff_d = debugfs_create_u32("coeff_d", S_IRUSR | S_IWUSR, |
9902b184 | 410 | debugfsdir, (u32 *)&pinfo->coeff_d); |
1946b74c | 411 | de->smoothing_shift = debugfs_create_u32("smoothing_shift", |
4b7679a5 | 412 | S_IRUSR | S_IWUSR, debugfsdir, |
1946b74c MN |
413 | &pinfo->smoothing_shift); |
414 | de->sharpen_factor = debugfs_create_u32("sharpen_factor", | |
4b7679a5 | 415 | S_IRUSR | S_IWUSR, debugfsdir, |
1946b74c MN |
416 | &pinfo->sharpen_factor); |
417 | de->sharpen_duration = debugfs_create_u32("sharpen_duration", | |
4b7679a5 | 418 | S_IRUSR | S_IWUSR, debugfsdir, |
1946b74c MN |
419 | &pinfo->sharpen_duration); |
420 | de->norm_offset = debugfs_create_u32("norm_offset", | |
4b7679a5 | 421 | S_IRUSR | S_IWUSR, debugfsdir, |
1946b74c | 422 | &pinfo->norm_offset); |
1946b74c MN |
423 | #endif |
424 | ||
ad018375 MN |
425 | return pinfo; |
426 | } | |
427 | ||
428 | static void rate_control_pid_free(void *priv) | |
429 | { | |
430 | struct rc_pid_info *pinfo = priv; | |
1946b74c MN |
431 | #ifdef CONFIG_MAC80211_DEBUGFS |
432 | struct rc_pid_debugfs_entries *de = &pinfo->dentries; | |
433 | ||
1946b74c MN |
434 | debugfs_remove(de->norm_offset); |
435 | debugfs_remove(de->sharpen_duration); | |
436 | debugfs_remove(de->sharpen_factor); | |
437 | debugfs_remove(de->smoothing_shift); | |
438 | debugfs_remove(de->coeff_d); | |
439 | debugfs_remove(de->coeff_i); | |
440 | debugfs_remove(de->coeff_p); | |
441 | debugfs_remove(de->sampling_period); | |
442 | debugfs_remove(de->target); | |
1946b74c MN |
443 | #endif |
444 | ||
90d501d6 | 445 | kfree(pinfo->rinfo); |
ad018375 MN |
446 | kfree(pinfo); |
447 | } | |
448 | ||
4b7679a5 JB |
449 | static void *rate_control_pid_alloc_sta(void *priv, struct ieee80211_sta *sta, |
450 | gfp_t gfp) | |
ad018375 MN |
451 | { |
452 | struct rc_pid_sta_info *spinfo; | |
453 | ||
454 | spinfo = kzalloc(sizeof(*spinfo), gfp); | |
12446c67 MN |
455 | if (spinfo == NULL) |
456 | return NULL; | |
457 | ||
c09c7237 SB |
458 | spinfo->last_sample = jiffies; |
459 | ||
12446c67 MN |
460 | #ifdef CONFIG_MAC80211_DEBUGFS |
461 | spin_lock_init(&spinfo->events.lock); | |
462 | init_waitqueue_head(&spinfo->events.waitqueue); | |
463 | #endif | |
ad018375 MN |
464 | |
465 | return spinfo; | |
466 | } | |
467 | ||
4b7679a5 JB |
468 | static void rate_control_pid_free_sta(void *priv, struct ieee80211_sta *sta, |
469 | void *priv_sta) | |
ad018375 | 470 | { |
4b7679a5 | 471 | kfree(priv_sta); |
ad018375 MN |
472 | } |
473 | ||
4b475898 | 474 | static struct rate_control_ops mac80211_rcpid = { |
ad018375 MN |
475 | .name = "pid", |
476 | .tx_status = rate_control_pid_tx_status, | |
477 | .get_rate = rate_control_pid_get_rate, | |
478 | .rate_init = rate_control_pid_rate_init, | |
ad018375 MN |
479 | .alloc = rate_control_pid_alloc, |
480 | .free = rate_control_pid_free, | |
481 | .alloc_sta = rate_control_pid_alloc_sta, | |
482 | .free_sta = rate_control_pid_free_sta, | |
12446c67 MN |
483 | #ifdef CONFIG_MAC80211_DEBUGFS |
484 | .add_sta_debugfs = rate_control_pid_add_sta_debugfs, | |
485 | .remove_sta_debugfs = rate_control_pid_remove_sta_debugfs, | |
486 | #endif | |
ad018375 | 487 | }; |
4b475898 | 488 | |
4b475898 JB |
489 | int __init rc80211_pid_init(void) |
490 | { | |
491 | return ieee80211_rate_control_register(&mac80211_rcpid); | |
492 | } | |
493 | ||
f0b9205c | 494 | void rc80211_pid_exit(void) |
4b475898 JB |
495 | { |
496 | ieee80211_rate_control_unregister(&mac80211_rcpid); | |
497 | } |