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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> | |
90d501d6 | 5 | * Copyright 2007, 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 MN |
16 | #include <net/mac80211.h> |
17 | #include "ieee80211_rate.h" | |
18 | ||
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 | |
90d501d6 SB |
67 | /* Shift the adjustment so that we won't switch to a lower rate if it exhibited |
68 | * a worse failed frames behaviour and we'll choose the highest rate whose | |
69 | * failed frames behaviour is not worse than the one of the original rate | |
70 | * target. While at it, check that the adjustment is within the ranges. Then, | |
71 | * provide the new rate index. */ | |
72 | static int rate_control_pid_shift_adjust(struct rc_pid_rateinfo *r, | |
73 | int adj, int cur, int l) | |
74 | { | |
75 | int i, j, k, tmp; | |
76 | ||
fa44327c SB |
77 | j = r[cur].rev_index; |
78 | i = j + adj; | |
90d501d6 | 79 | |
fa44327c SB |
80 | if (i < 0) |
81 | return r[0].index; | |
82 | if (i >= l - 1) | |
83 | return r[l - 1].index; | |
90d501d6 | 84 | |
fa44327c | 85 | tmp = i; |
90d501d6 SB |
86 | |
87 | if (adj < 0) { | |
fa44327c SB |
88 | for (k = j; k >= i; k--) |
89 | if (r[k].diff <= r[j].diff) | |
90 | tmp = k; | |
91 | } else { | |
92 | for (k = i + 1; k + i < l; k++) | |
93 | if (r[k].diff <= r[i].diff) | |
94 | tmp = k; | |
90d501d6 | 95 | } |
fa44327c SB |
96 | |
97 | return r[tmp].index; | |
90d501d6 | 98 | } |
ad018375 MN |
99 | |
100 | static void rate_control_pid_adjust_rate(struct ieee80211_local *local, | |
90d501d6 SB |
101 | struct sta_info *sta, int adj, |
102 | struct rc_pid_rateinfo *rinfo) | |
ad018375 MN |
103 | { |
104 | struct ieee80211_sub_if_data *sdata; | |
8318d78a | 105 | struct ieee80211_supported_band *sband; |
90d501d6 | 106 | int newidx; |
ad018375 MN |
107 | int maxrate; |
108 | int back = (adj > 0) ? 1 : -1; | |
109 | ||
110 | sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev); | |
ad018375 | 111 | |
8318d78a | 112 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; |
ad018375 MN |
113 | maxrate = sdata->bss ? sdata->bss->max_ratectrl_rateidx : -1; |
114 | ||
8318d78a JB |
115 | newidx = rate_control_pid_shift_adjust(rinfo, adj, sta->txrate_idx, |
116 | sband->n_bitrates); | |
ad018375 | 117 | |
8318d78a JB |
118 | while (newidx != sta->txrate_idx) { |
119 | if (rate_supported(sta, sband->band, newidx) && | |
ad018375 | 120 | (maxrate < 0 || newidx <= maxrate)) { |
8318d78a | 121 | sta->txrate_idx = newidx; |
ad018375 MN |
122 | break; |
123 | } | |
124 | ||
125 | newidx += back; | |
126 | } | |
12446c67 MN |
127 | |
128 | #ifdef CONFIG_MAC80211_DEBUGFS | |
129 | rate_control_pid_event_rate_change( | |
130 | &((struct rc_pid_sta_info *)sta->rate_ctrl_priv)->events, | |
8318d78a | 131 | newidx, sband->bitrates[newidx].bitrate); |
12446c67 | 132 | #endif |
ad018375 MN |
133 | } |
134 | ||
90d501d6 | 135 | /* Normalize the failed frames per-rate differences. */ |
1946b74c | 136 | static void rate_control_pid_normalize(struct rc_pid_info *pinfo, int l) |
90d501d6 | 137 | { |
1946b74c MN |
138 | int i, norm_offset = pinfo->norm_offset; |
139 | struct rc_pid_rateinfo *r = pinfo->rinfo; | |
90d501d6 | 140 | |
1946b74c MN |
141 | if (r[0].diff > norm_offset) |
142 | r[0].diff -= norm_offset; | |
143 | else if (r[0].diff < -norm_offset) | |
144 | r[0].diff += norm_offset; | |
90d501d6 | 145 | for (i = 0; i < l - 1; i++) |
1946b74c MN |
146 | if (r[i + 1].diff > r[i].diff + norm_offset) |
147 | r[i + 1].diff -= norm_offset; | |
90d501d6 | 148 | else if (r[i + 1].diff <= r[i].diff) |
1946b74c | 149 | r[i + 1].diff += norm_offset; |
90d501d6 SB |
150 | } |
151 | ||
ad018375 MN |
152 | static void rate_control_pid_sample(struct rc_pid_info *pinfo, |
153 | struct ieee80211_local *local, | |
154 | struct sta_info *sta) | |
155 | { | |
156 | struct rc_pid_sta_info *spinfo = sta->rate_ctrl_priv; | |
90d501d6 | 157 | struct rc_pid_rateinfo *rinfo = pinfo->rinfo; |
8318d78a | 158 | struct ieee80211_supported_band *sband; |
ad018375 MN |
159 | u32 pf; |
160 | s32 err_avg; | |
1946b74c MN |
161 | u32 err_prop; |
162 | u32 err_int; | |
163 | u32 err_der; | |
90d501d6 | 164 | int adj, i, j, tmp; |
1946b74c | 165 | unsigned long period; |
ad018375 | 166 | |
8318d78a | 167 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; |
ad018375 | 168 | spinfo = sta->rate_ctrl_priv; |
1dc4d1e6 SB |
169 | |
170 | /* In case nothing happened during the previous control interval, turn | |
171 | * the sharpening factor on. */ | |
1946b74c MN |
172 | period = (HZ * pinfo->sampling_period + 500) / 1000; |
173 | if (!period) | |
174 | period = 1; | |
175 | if (jiffies - spinfo->last_sample > 2 * period) | |
176 | spinfo->sharp_cnt = pinfo->sharpen_duration; | |
1dc4d1e6 | 177 | |
ad018375 MN |
178 | spinfo->last_sample = jiffies; |
179 | ||
1dc4d1e6 | 180 | /* This should never happen, but in case, we assume the old sample is |
ad018375 | 181 | * still a good measurement and copy it. */ |
1dc4d1e6 | 182 | if (unlikely(spinfo->tx_num_xmit == 0)) |
ad018375 MN |
183 | pf = spinfo->last_pf; |
184 | else { | |
185 | pf = spinfo->tx_num_failed * 100 / spinfo->tx_num_xmit; | |
186 | pf <<= RC_PID_ARITH_SHIFT; | |
ad018375 MN |
187 | } |
188 | ||
1dc4d1e6 SB |
189 | spinfo->tx_num_xmit = 0; |
190 | spinfo->tx_num_failed = 0; | |
191 | ||
90d501d6 | 192 | /* If we just switched rate, update the rate behaviour info. */ |
8318d78a | 193 | if (pinfo->oldrate != sta->txrate_idx) { |
90d501d6 SB |
194 | |
195 | i = rinfo[pinfo->oldrate].rev_index; | |
8318d78a | 196 | j = rinfo[sta->txrate_idx].rev_index; |
90d501d6 SB |
197 | |
198 | tmp = (pf - spinfo->last_pf); | |
199 | tmp = RC_PID_DO_ARITH_RIGHT_SHIFT(tmp, RC_PID_ARITH_SHIFT); | |
200 | ||
201 | rinfo[j].diff = rinfo[i].diff + tmp; | |
8318d78a | 202 | pinfo->oldrate = sta->txrate_idx; |
90d501d6 | 203 | } |
8318d78a | 204 | rate_control_pid_normalize(pinfo, sband->n_bitrates); |
90d501d6 | 205 | |
ad018375 | 206 | /* Compute the proportional, integral and derivative errors. */ |
426706c0 | 207 | err_prop = (pinfo->target << RC_PID_ARITH_SHIFT) - pf; |
ad018375 | 208 | |
1946b74c | 209 | err_avg = spinfo->err_avg_sc >> pinfo->smoothing_shift; |
ad018375 | 210 | spinfo->err_avg_sc = spinfo->err_avg_sc - err_avg + err_prop; |
1946b74c | 211 | err_int = spinfo->err_avg_sc >> pinfo->smoothing_shift; |
ad018375 | 212 | |
1946b74c MN |
213 | err_der = (pf - spinfo->last_pf) * |
214 | (1 + pinfo->sharpen_factor * spinfo->sharp_cnt); | |
ad018375 | 215 | spinfo->last_pf = pf; |
1dc4d1e6 SB |
216 | if (spinfo->sharp_cnt) |
217 | spinfo->sharp_cnt--; | |
ad018375 | 218 | |
12446c67 MN |
219 | #ifdef CONFIG_MAC80211_DEBUGFS |
220 | rate_control_pid_event_pf_sample(&spinfo->events, pf, err_prop, err_int, | |
221 | err_der); | |
222 | #endif | |
223 | ||
ad018375 MN |
224 | /* Compute the controller output. */ |
225 | adj = (err_prop * pinfo->coeff_p + err_int * pinfo->coeff_i | |
226 | + err_der * pinfo->coeff_d); | |
90d501d6 | 227 | adj = RC_PID_DO_ARITH_RIGHT_SHIFT(adj, 2 * RC_PID_ARITH_SHIFT); |
ad018375 MN |
228 | |
229 | /* Change rate. */ | |
230 | if (adj) | |
90d501d6 | 231 | rate_control_pid_adjust_rate(local, sta, adj, rinfo); |
ad018375 MN |
232 | } |
233 | ||
234 | static void rate_control_pid_tx_status(void *priv, struct net_device *dev, | |
235 | struct sk_buff *skb, | |
236 | struct ieee80211_tx_status *status) | |
237 | { | |
238 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
239 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
df26e7ea | 240 | struct ieee80211_sub_if_data *sdata; |
ad018375 MN |
241 | struct rc_pid_info *pinfo = priv; |
242 | struct sta_info *sta; | |
243 | struct rc_pid_sta_info *spinfo; | |
1946b74c | 244 | unsigned long period; |
8318d78a | 245 | struct ieee80211_supported_band *sband; |
ad018375 MN |
246 | |
247 | sta = sta_info_get(local, hdr->addr1); | |
8318d78a | 248 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; |
ad018375 MN |
249 | |
250 | if (!sta) | |
251 | return; | |
252 | ||
df26e7ea AL |
253 | /* Don't update the state if we're not controlling the rate. */ |
254 | sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev); | |
255 | if (sdata->bss && sdata->bss->force_unicast_rateidx > -1) { | |
8318d78a | 256 | sta->txrate_idx = sdata->bss->max_ratectrl_rateidx; |
df26e7ea AL |
257 | return; |
258 | } | |
259 | ||
ad018375 MN |
260 | /* Ignore all frames that were sent with a different rate than the rate |
261 | * we currently advise mac80211 to use. */ | |
8318d78a | 262 | if (status->control.tx_rate != &sband->bitrates[sta->txrate_idx]) |
13e05aa6 | 263 | goto ignore; |
ad018375 MN |
264 | |
265 | spinfo = sta->rate_ctrl_priv; | |
266 | spinfo->tx_num_xmit++; | |
267 | ||
12446c67 MN |
268 | #ifdef CONFIG_MAC80211_DEBUGFS |
269 | rate_control_pid_event_tx_status(&spinfo->events, status); | |
270 | #endif | |
271 | ||
ad018375 MN |
272 | /* We count frames that totally failed to be transmitted as two bad |
273 | * frames, those that made it out but had some retries as one good and | |
274 | * one bad frame. */ | |
275 | if (status->excessive_retries) { | |
276 | spinfo->tx_num_failed += 2; | |
277 | spinfo->tx_num_xmit++; | |
278 | } else if (status->retry_count) { | |
279 | spinfo->tx_num_failed++; | |
280 | spinfo->tx_num_xmit++; | |
281 | } | |
282 | ||
283 | if (status->excessive_retries) { | |
284 | sta->tx_retry_failed++; | |
285 | sta->tx_num_consecutive_failures++; | |
286 | sta->tx_num_mpdu_fail++; | |
287 | } else { | |
288 | sta->last_ack_rssi[0] = sta->last_ack_rssi[1]; | |
289 | sta->last_ack_rssi[1] = sta->last_ack_rssi[2]; | |
290 | sta->last_ack_rssi[2] = status->ack_signal; | |
291 | sta->tx_num_consecutive_failures = 0; | |
292 | sta->tx_num_mpdu_ok++; | |
293 | } | |
294 | sta->tx_retry_count += status->retry_count; | |
295 | sta->tx_num_mpdu_fail += status->retry_count; | |
296 | ||
297 | /* Update PID controller state. */ | |
1946b74c MN |
298 | period = (HZ * pinfo->sampling_period + 500) / 1000; |
299 | if (!period) | |
300 | period = 1; | |
301 | if (time_after(jiffies, spinfo->last_sample + period)) | |
ad018375 MN |
302 | rate_control_pid_sample(pinfo, local, sta); |
303 | ||
13e05aa6 | 304 | ignore: |
ad018375 MN |
305 | sta_info_put(sta); |
306 | } | |
307 | ||
308 | static void rate_control_pid_get_rate(void *priv, struct net_device *dev, | |
8318d78a | 309 | struct ieee80211_supported_band *sband, |
ad018375 MN |
310 | struct sk_buff *skb, |
311 | struct rate_selection *sel) | |
312 | { | |
313 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
314 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2bc454b0 | 315 | struct ieee80211_sub_if_data *sdata; |
ad018375 MN |
316 | struct sta_info *sta; |
317 | int rateidx; | |
2bc454b0 | 318 | u16 fc; |
ad018375 MN |
319 | |
320 | sta = sta_info_get(local, hdr->addr1); | |
321 | ||
2bc454b0 MW |
322 | /* Send management frames and broadcast/multicast data using lowest |
323 | * rate. */ | |
324 | fc = le16_to_cpu(hdr->frame_control); | |
325 | if ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA || | |
326 | is_multicast_ether_addr(hdr->addr1) || !sta) { | |
8318d78a | 327 | sel->rate = rate_lowest(local, sband, sta); |
2bc454b0 MW |
328 | if (sta) |
329 | sta_info_put(sta); | |
ad018375 MN |
330 | return; |
331 | } | |
332 | ||
2bc454b0 MW |
333 | /* If a forced rate is in effect, select it. */ |
334 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
335 | if (sdata->bss && sdata->bss->force_unicast_rateidx > -1) | |
8318d78a | 336 | sta->txrate_idx = sdata->bss->force_unicast_rateidx; |
2bc454b0 | 337 | |
8318d78a | 338 | rateidx = sta->txrate_idx; |
ad018375 | 339 | |
8318d78a JB |
340 | if (rateidx >= sband->n_bitrates) |
341 | rateidx = sband->n_bitrates - 1; | |
ad018375 | 342 | |
8318d78a | 343 | sta->last_txrate_idx = rateidx; |
2bc454b0 | 344 | |
ad018375 MN |
345 | sta_info_put(sta); |
346 | ||
8318d78a | 347 | sel->rate = &sband->bitrates[rateidx]; |
12446c67 MN |
348 | |
349 | #ifdef CONFIG_MAC80211_DEBUGFS | |
350 | rate_control_pid_event_tx_rate( | |
351 | &((struct rc_pid_sta_info *) sta->rate_ctrl_priv)->events, | |
8318d78a | 352 | rateidx, sband->bitrates[rateidx].bitrate); |
12446c67 | 353 | #endif |
ad018375 MN |
354 | } |
355 | ||
356 | static void rate_control_pid_rate_init(void *priv, void *priv_sta, | |
357 | struct ieee80211_local *local, | |
358 | struct sta_info *sta) | |
359 | { | |
360 | /* TODO: This routine should consider using RSSI from previous packets | |
361 | * as we need to have IEEE 802.1X auth succeed immediately after assoc.. | |
362 | * Until that method is implemented, we will use the lowest supported | |
363 | * rate as a workaround. */ | |
8318d78a JB |
364 | struct ieee80211_supported_band *sband; |
365 | ||
366 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; | |
367 | sta->txrate_idx = rate_lowest_index(local, sband, sta); | |
ad018375 MN |
368 | } |
369 | ||
370 | static void *rate_control_pid_alloc(struct ieee80211_local *local) | |
371 | { | |
372 | struct rc_pid_info *pinfo; | |
90d501d6 | 373 | struct rc_pid_rateinfo *rinfo; |
8318d78a | 374 | struct ieee80211_supported_band *sband; |
90d501d6 SB |
375 | int i, j, tmp; |
376 | bool s; | |
1946b74c MN |
377 | #ifdef CONFIG_MAC80211_DEBUGFS |
378 | struct rc_pid_debugfs_entries *de; | |
379 | #endif | |
ad018375 | 380 | |
8318d78a JB |
381 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; |
382 | ||
ad018375 | 383 | pinfo = kmalloc(sizeof(*pinfo), GFP_ATOMIC); |
90d501d6 SB |
384 | if (!pinfo) |
385 | return NULL; | |
386 | ||
8318d78a | 387 | /* We can safely assume that sband won't change unless we get |
90d501d6 | 388 | * reinitialized. */ |
8318d78a | 389 | rinfo = kmalloc(sizeof(*rinfo) * sband->n_bitrates, GFP_ATOMIC); |
90d501d6 SB |
390 | if (!rinfo) { |
391 | kfree(pinfo); | |
392 | return NULL; | |
393 | } | |
394 | ||
395 | /* Sort the rates. This is optimized for the most common case (i.e. | |
396 | * almost-sorted CCK+OFDM rates). Kind of bubble-sort with reversed | |
397 | * mapping too. */ | |
8318d78a | 398 | for (i = 0; i < sband->n_bitrates; i++) { |
90d501d6 SB |
399 | rinfo[i].index = i; |
400 | rinfo[i].rev_index = i; | |
1946b74c | 401 | if (pinfo->fast_start) |
90d501d6 SB |
402 | rinfo[i].diff = 0; |
403 | else | |
1946b74c | 404 | rinfo[i].diff = i * pinfo->norm_offset; |
90d501d6 | 405 | } |
8318d78a | 406 | for (i = 1; i < sband->n_bitrates; i++) { |
90d501d6 | 407 | s = 0; |
8318d78a JB |
408 | for (j = 0; j < sband->n_bitrates - i; j++) |
409 | if (unlikely(sband->bitrates[rinfo[j].index].bitrate > | |
410 | sband->bitrates[rinfo[j + 1].index].bitrate)) { | |
90d501d6 SB |
411 | tmp = rinfo[j].index; |
412 | rinfo[j].index = rinfo[j + 1].index; | |
413 | rinfo[j + 1].index = tmp; | |
414 | rinfo[rinfo[j].index].rev_index = j; | |
415 | rinfo[rinfo[j + 1].index].rev_index = j + 1; | |
416 | s = 1; | |
417 | } | |
418 | if (!s) | |
419 | break; | |
420 | } | |
ad018375 MN |
421 | |
422 | pinfo->target = RC_PID_TARGET_PF; | |
1946b74c | 423 | pinfo->sampling_period = RC_PID_INTERVAL; |
ad018375 MN |
424 | pinfo->coeff_p = RC_PID_COEFF_P; |
425 | pinfo->coeff_i = RC_PID_COEFF_I; | |
426 | pinfo->coeff_d = RC_PID_COEFF_D; | |
1946b74c MN |
427 | pinfo->smoothing_shift = RC_PID_SMOOTHING_SHIFT; |
428 | pinfo->sharpen_factor = RC_PID_SHARPENING_FACTOR; | |
429 | pinfo->sharpen_duration = RC_PID_SHARPENING_DURATION; | |
430 | pinfo->norm_offset = RC_PID_NORM_OFFSET; | |
431 | pinfo->fast_start = RC_PID_FAST_START; | |
90d501d6 SB |
432 | pinfo->rinfo = rinfo; |
433 | pinfo->oldrate = 0; | |
ad018375 | 434 | |
1946b74c MN |
435 | #ifdef CONFIG_MAC80211_DEBUGFS |
436 | de = &pinfo->dentries; | |
437 | de->dir = debugfs_create_dir("rc80211_pid", | |
438 | local->hw.wiphy->debugfsdir); | |
439 | de->target = debugfs_create_u32("target_pf", S_IRUSR | S_IWUSR, | |
440 | de->dir, &pinfo->target); | |
441 | de->sampling_period = debugfs_create_u32("sampling_period", | |
442 | S_IRUSR | S_IWUSR, de->dir, | |
443 | &pinfo->sampling_period); | |
444 | de->coeff_p = debugfs_create_u32("coeff_p", S_IRUSR | S_IWUSR, | |
445 | de->dir, &pinfo->coeff_p); | |
446 | de->coeff_i = debugfs_create_u32("coeff_i", S_IRUSR | S_IWUSR, | |
447 | de->dir, &pinfo->coeff_i); | |
448 | de->coeff_d = debugfs_create_u32("coeff_d", S_IRUSR | S_IWUSR, | |
449 | de->dir, &pinfo->coeff_d); | |
450 | de->smoothing_shift = debugfs_create_u32("smoothing_shift", | |
451 | S_IRUSR | S_IWUSR, de->dir, | |
452 | &pinfo->smoothing_shift); | |
453 | de->sharpen_factor = debugfs_create_u32("sharpen_factor", | |
454 | S_IRUSR | S_IWUSR, de->dir, | |
455 | &pinfo->sharpen_factor); | |
456 | de->sharpen_duration = debugfs_create_u32("sharpen_duration", | |
457 | S_IRUSR | S_IWUSR, de->dir, | |
458 | &pinfo->sharpen_duration); | |
459 | de->norm_offset = debugfs_create_u32("norm_offset", | |
460 | S_IRUSR | S_IWUSR, de->dir, | |
461 | &pinfo->norm_offset); | |
462 | de->fast_start = debugfs_create_bool("fast_start", | |
463 | S_IRUSR | S_IWUSR, de->dir, | |
464 | &pinfo->fast_start); | |
465 | #endif | |
466 | ||
ad018375 MN |
467 | return pinfo; |
468 | } | |
469 | ||
470 | static void rate_control_pid_free(void *priv) | |
471 | { | |
472 | struct rc_pid_info *pinfo = priv; | |
1946b74c MN |
473 | #ifdef CONFIG_MAC80211_DEBUGFS |
474 | struct rc_pid_debugfs_entries *de = &pinfo->dentries; | |
475 | ||
476 | debugfs_remove(de->fast_start); | |
477 | debugfs_remove(de->norm_offset); | |
478 | debugfs_remove(de->sharpen_duration); | |
479 | debugfs_remove(de->sharpen_factor); | |
480 | debugfs_remove(de->smoothing_shift); | |
481 | debugfs_remove(de->coeff_d); | |
482 | debugfs_remove(de->coeff_i); | |
483 | debugfs_remove(de->coeff_p); | |
484 | debugfs_remove(de->sampling_period); | |
485 | debugfs_remove(de->target); | |
486 | debugfs_remove(de->dir); | |
487 | #endif | |
488 | ||
90d501d6 | 489 | kfree(pinfo->rinfo); |
ad018375 MN |
490 | kfree(pinfo); |
491 | } | |
492 | ||
493 | static void rate_control_pid_clear(void *priv) | |
494 | { | |
495 | } | |
496 | ||
497 | static void *rate_control_pid_alloc_sta(void *priv, gfp_t gfp) | |
498 | { | |
499 | struct rc_pid_sta_info *spinfo; | |
500 | ||
501 | spinfo = kzalloc(sizeof(*spinfo), gfp); | |
12446c67 MN |
502 | if (spinfo == NULL) |
503 | return NULL; | |
504 | ||
c09c7237 SB |
505 | spinfo->last_sample = jiffies; |
506 | ||
12446c67 MN |
507 | #ifdef CONFIG_MAC80211_DEBUGFS |
508 | spin_lock_init(&spinfo->events.lock); | |
509 | init_waitqueue_head(&spinfo->events.waitqueue); | |
510 | #endif | |
ad018375 MN |
511 | |
512 | return spinfo; | |
513 | } | |
514 | ||
515 | static void rate_control_pid_free_sta(void *priv, void *priv_sta) | |
516 | { | |
517 | struct rc_pid_sta_info *spinfo = priv_sta; | |
518 | kfree(spinfo); | |
519 | } | |
520 | ||
4b475898 | 521 | static struct rate_control_ops mac80211_rcpid = { |
ad018375 MN |
522 | .name = "pid", |
523 | .tx_status = rate_control_pid_tx_status, | |
524 | .get_rate = rate_control_pid_get_rate, | |
525 | .rate_init = rate_control_pid_rate_init, | |
526 | .clear = rate_control_pid_clear, | |
527 | .alloc = rate_control_pid_alloc, | |
528 | .free = rate_control_pid_free, | |
529 | .alloc_sta = rate_control_pid_alloc_sta, | |
530 | .free_sta = rate_control_pid_free_sta, | |
12446c67 MN |
531 | #ifdef CONFIG_MAC80211_DEBUGFS |
532 | .add_sta_debugfs = rate_control_pid_add_sta_debugfs, | |
533 | .remove_sta_debugfs = rate_control_pid_remove_sta_debugfs, | |
534 | #endif | |
ad018375 | 535 | }; |
4b475898 JB |
536 | |
537 | MODULE_DESCRIPTION("PID controller based rate control algorithm"); | |
538 | MODULE_AUTHOR("Stefano Brivio"); | |
539 | MODULE_AUTHOR("Mattias Nissler"); | |
540 | MODULE_LICENSE("GPL"); | |
541 | ||
542 | int __init rc80211_pid_init(void) | |
543 | { | |
544 | return ieee80211_rate_control_register(&mac80211_rcpid); | |
545 | } | |
546 | ||
f0b9205c | 547 | void rc80211_pid_exit(void) |
4b475898 JB |
548 | { |
549 | ieee80211_rate_control_unregister(&mac80211_rcpid); | |
550 | } | |
551 | ||
552 | #ifdef CONFIG_MAC80211_RC_PID_MODULE | |
553 | module_init(rc80211_pid_init); | |
554 | module_exit(rc80211_pid_exit); | |
555 | #endif |