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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; | |
105 | struct ieee80211_hw_mode *mode; | |
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 MN |
111 | |
112 | mode = local->oper_hw_mode; | |
113 | maxrate = sdata->bss ? sdata->bss->max_ratectrl_rateidx : -1; | |
114 | ||
90d501d6 SB |
115 | newidx = rate_control_pid_shift_adjust(rinfo, adj, sta->txrate, |
116 | mode->num_rates); | |
ad018375 MN |
117 | |
118 | while (newidx != sta->txrate) { | |
119 | if (rate_supported(sta, mode, newidx) && | |
120 | (maxrate < 0 || newidx <= maxrate)) { | |
121 | sta->txrate = newidx; | |
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, | |
131 | newidx, mode->rates[newidx].rate); | |
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 SB |
157 | struct rc_pid_rateinfo *rinfo = pinfo->rinfo; |
158 | struct ieee80211_hw_mode *mode; | |
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 | |
90d501d6 | 167 | mode = local->oper_hw_mode; |
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 SB |
192 | /* If we just switched rate, update the rate behaviour info. */ |
193 | if (pinfo->oldrate != sta->txrate) { | |
194 | ||
195 | i = rinfo[pinfo->oldrate].rev_index; | |
196 | j = rinfo[sta->txrate].rev_index; | |
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; | |
202 | pinfo->oldrate = sta->txrate; | |
203 | } | |
1946b74c | 204 | rate_control_pid_normalize(pinfo, mode->num_rates); |
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; |
ad018375 MN |
245 | |
246 | sta = sta_info_get(local, hdr->addr1); | |
247 | ||
248 | if (!sta) | |
249 | return; | |
250 | ||
df26e7ea AL |
251 | /* Don't update the state if we're not controlling the rate. */ |
252 | sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev); | |
253 | if (sdata->bss && sdata->bss->force_unicast_rateidx > -1) { | |
254 | sta->txrate = sdata->bss->max_ratectrl_rateidx; | |
255 | return; | |
256 | } | |
257 | ||
ad018375 MN |
258 | /* Ignore all frames that were sent with a different rate than the rate |
259 | * we currently advise mac80211 to use. */ | |
260 | if (status->control.rate != &local->oper_hw_mode->rates[sta->txrate]) | |
13e05aa6 | 261 | goto ignore; |
ad018375 MN |
262 | |
263 | spinfo = sta->rate_ctrl_priv; | |
264 | spinfo->tx_num_xmit++; | |
265 | ||
12446c67 MN |
266 | #ifdef CONFIG_MAC80211_DEBUGFS |
267 | rate_control_pid_event_tx_status(&spinfo->events, status); | |
268 | #endif | |
269 | ||
ad018375 MN |
270 | /* We count frames that totally failed to be transmitted as two bad |
271 | * frames, those that made it out but had some retries as one good and | |
272 | * one bad frame. */ | |
273 | if (status->excessive_retries) { | |
274 | spinfo->tx_num_failed += 2; | |
275 | spinfo->tx_num_xmit++; | |
276 | } else if (status->retry_count) { | |
277 | spinfo->tx_num_failed++; | |
278 | spinfo->tx_num_xmit++; | |
279 | } | |
280 | ||
281 | if (status->excessive_retries) { | |
282 | sta->tx_retry_failed++; | |
283 | sta->tx_num_consecutive_failures++; | |
284 | sta->tx_num_mpdu_fail++; | |
285 | } else { | |
286 | sta->last_ack_rssi[0] = sta->last_ack_rssi[1]; | |
287 | sta->last_ack_rssi[1] = sta->last_ack_rssi[2]; | |
288 | sta->last_ack_rssi[2] = status->ack_signal; | |
289 | sta->tx_num_consecutive_failures = 0; | |
290 | sta->tx_num_mpdu_ok++; | |
291 | } | |
292 | sta->tx_retry_count += status->retry_count; | |
293 | sta->tx_num_mpdu_fail += status->retry_count; | |
294 | ||
295 | /* Update PID controller state. */ | |
1946b74c MN |
296 | period = (HZ * pinfo->sampling_period + 500) / 1000; |
297 | if (!period) | |
298 | period = 1; | |
299 | if (time_after(jiffies, spinfo->last_sample + period)) | |
ad018375 MN |
300 | rate_control_pid_sample(pinfo, local, sta); |
301 | ||
13e05aa6 | 302 | ignore: |
ad018375 MN |
303 | sta_info_put(sta); |
304 | } | |
305 | ||
306 | static void rate_control_pid_get_rate(void *priv, struct net_device *dev, | |
307 | struct ieee80211_hw_mode *mode, | |
308 | struct sk_buff *skb, | |
309 | struct rate_selection *sel) | |
310 | { | |
311 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
312 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2bc454b0 | 313 | struct ieee80211_sub_if_data *sdata; |
ad018375 MN |
314 | struct sta_info *sta; |
315 | int rateidx; | |
2bc454b0 | 316 | u16 fc; |
ad018375 MN |
317 | |
318 | sta = sta_info_get(local, hdr->addr1); | |
319 | ||
2bc454b0 MW |
320 | /* Send management frames and broadcast/multicast data using lowest |
321 | * rate. */ | |
322 | fc = le16_to_cpu(hdr->frame_control); | |
323 | if ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA || | |
324 | is_multicast_ether_addr(hdr->addr1) || !sta) { | |
325 | sel->rate = rate_lowest(local, mode, sta); | |
326 | if (sta) | |
327 | sta_info_put(sta); | |
ad018375 MN |
328 | return; |
329 | } | |
330 | ||
2bc454b0 MW |
331 | /* If a forced rate is in effect, select it. */ |
332 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
333 | if (sdata->bss && sdata->bss->force_unicast_rateidx > -1) | |
334 | sta->txrate = sdata->bss->force_unicast_rateidx; | |
335 | ||
ad018375 MN |
336 | rateidx = sta->txrate; |
337 | ||
338 | if (rateidx >= mode->num_rates) | |
339 | rateidx = mode->num_rates - 1; | |
340 | ||
2bc454b0 MW |
341 | sta->last_txrate = rateidx; |
342 | ||
ad018375 MN |
343 | sta_info_put(sta); |
344 | ||
345 | sel->rate = &mode->rates[rateidx]; | |
12446c67 MN |
346 | |
347 | #ifdef CONFIG_MAC80211_DEBUGFS | |
348 | rate_control_pid_event_tx_rate( | |
349 | &((struct rc_pid_sta_info *) sta->rate_ctrl_priv)->events, | |
350 | rateidx, mode->rates[rateidx].rate); | |
351 | #endif | |
ad018375 MN |
352 | } |
353 | ||
354 | static void rate_control_pid_rate_init(void *priv, void *priv_sta, | |
355 | struct ieee80211_local *local, | |
356 | struct sta_info *sta) | |
357 | { | |
358 | /* TODO: This routine should consider using RSSI from previous packets | |
359 | * as we need to have IEEE 802.1X auth succeed immediately after assoc.. | |
360 | * Until that method is implemented, we will use the lowest supported | |
361 | * rate as a workaround. */ | |
362 | sta->txrate = rate_lowest_index(local, local->oper_hw_mode, sta); | |
363 | } | |
364 | ||
365 | static void *rate_control_pid_alloc(struct ieee80211_local *local) | |
366 | { | |
367 | struct rc_pid_info *pinfo; | |
90d501d6 SB |
368 | struct rc_pid_rateinfo *rinfo; |
369 | struct ieee80211_hw_mode *mode; | |
370 | int i, j, tmp; | |
371 | bool s; | |
1946b74c MN |
372 | #ifdef CONFIG_MAC80211_DEBUGFS |
373 | struct rc_pid_debugfs_entries *de; | |
374 | #endif | |
ad018375 MN |
375 | |
376 | pinfo = kmalloc(sizeof(*pinfo), GFP_ATOMIC); | |
90d501d6 SB |
377 | if (!pinfo) |
378 | return NULL; | |
379 | ||
380 | /* We can safely assume that oper_hw_mode won't change unless we get | |
381 | * reinitialized. */ | |
382 | mode = local->oper_hw_mode; | |
383 | rinfo = kmalloc(sizeof(*rinfo) * mode->num_rates, GFP_ATOMIC); | |
384 | if (!rinfo) { | |
385 | kfree(pinfo); | |
386 | return NULL; | |
387 | } | |
388 | ||
389 | /* Sort the rates. This is optimized for the most common case (i.e. | |
390 | * almost-sorted CCK+OFDM rates). Kind of bubble-sort with reversed | |
391 | * mapping too. */ | |
392 | for (i = 0; i < mode->num_rates; i++) { | |
393 | rinfo[i].index = i; | |
394 | rinfo[i].rev_index = i; | |
1946b74c | 395 | if (pinfo->fast_start) |
90d501d6 SB |
396 | rinfo[i].diff = 0; |
397 | else | |
1946b74c | 398 | rinfo[i].diff = i * pinfo->norm_offset; |
90d501d6 SB |
399 | } |
400 | for (i = 1; i < mode->num_rates; i++) { | |
401 | s = 0; | |
402 | for (j = 0; j < mode->num_rates - i; j++) | |
403 | if (unlikely(mode->rates[rinfo[j].index].rate > | |
404 | mode->rates[rinfo[j + 1].index].rate)) { | |
405 | tmp = rinfo[j].index; | |
406 | rinfo[j].index = rinfo[j + 1].index; | |
407 | rinfo[j + 1].index = tmp; | |
408 | rinfo[rinfo[j].index].rev_index = j; | |
409 | rinfo[rinfo[j + 1].index].rev_index = j + 1; | |
410 | s = 1; | |
411 | } | |
412 | if (!s) | |
413 | break; | |
414 | } | |
ad018375 MN |
415 | |
416 | pinfo->target = RC_PID_TARGET_PF; | |
1946b74c | 417 | pinfo->sampling_period = RC_PID_INTERVAL; |
ad018375 MN |
418 | pinfo->coeff_p = RC_PID_COEFF_P; |
419 | pinfo->coeff_i = RC_PID_COEFF_I; | |
420 | pinfo->coeff_d = RC_PID_COEFF_D; | |
1946b74c MN |
421 | pinfo->smoothing_shift = RC_PID_SMOOTHING_SHIFT; |
422 | pinfo->sharpen_factor = RC_PID_SHARPENING_FACTOR; | |
423 | pinfo->sharpen_duration = RC_PID_SHARPENING_DURATION; | |
424 | pinfo->norm_offset = RC_PID_NORM_OFFSET; | |
425 | pinfo->fast_start = RC_PID_FAST_START; | |
90d501d6 SB |
426 | pinfo->rinfo = rinfo; |
427 | pinfo->oldrate = 0; | |
ad018375 | 428 | |
1946b74c MN |
429 | #ifdef CONFIG_MAC80211_DEBUGFS |
430 | de = &pinfo->dentries; | |
431 | de->dir = debugfs_create_dir("rc80211_pid", | |
432 | local->hw.wiphy->debugfsdir); | |
433 | de->target = debugfs_create_u32("target_pf", S_IRUSR | S_IWUSR, | |
434 | de->dir, &pinfo->target); | |
435 | de->sampling_period = debugfs_create_u32("sampling_period", | |
436 | S_IRUSR | S_IWUSR, de->dir, | |
437 | &pinfo->sampling_period); | |
438 | de->coeff_p = debugfs_create_u32("coeff_p", S_IRUSR | S_IWUSR, | |
439 | de->dir, &pinfo->coeff_p); | |
440 | de->coeff_i = debugfs_create_u32("coeff_i", S_IRUSR | S_IWUSR, | |
441 | de->dir, &pinfo->coeff_i); | |
442 | de->coeff_d = debugfs_create_u32("coeff_d", S_IRUSR | S_IWUSR, | |
443 | de->dir, &pinfo->coeff_d); | |
444 | de->smoothing_shift = debugfs_create_u32("smoothing_shift", | |
445 | S_IRUSR | S_IWUSR, de->dir, | |
446 | &pinfo->smoothing_shift); | |
447 | de->sharpen_factor = debugfs_create_u32("sharpen_factor", | |
448 | S_IRUSR | S_IWUSR, de->dir, | |
449 | &pinfo->sharpen_factor); | |
450 | de->sharpen_duration = debugfs_create_u32("sharpen_duration", | |
451 | S_IRUSR | S_IWUSR, de->dir, | |
452 | &pinfo->sharpen_duration); | |
453 | de->norm_offset = debugfs_create_u32("norm_offset", | |
454 | S_IRUSR | S_IWUSR, de->dir, | |
455 | &pinfo->norm_offset); | |
456 | de->fast_start = debugfs_create_bool("fast_start", | |
457 | S_IRUSR | S_IWUSR, de->dir, | |
458 | &pinfo->fast_start); | |
459 | #endif | |
460 | ||
ad018375 MN |
461 | return pinfo; |
462 | } | |
463 | ||
464 | static void rate_control_pid_free(void *priv) | |
465 | { | |
466 | struct rc_pid_info *pinfo = priv; | |
1946b74c MN |
467 | #ifdef CONFIG_MAC80211_DEBUGFS |
468 | struct rc_pid_debugfs_entries *de = &pinfo->dentries; | |
469 | ||
470 | debugfs_remove(de->fast_start); | |
471 | debugfs_remove(de->norm_offset); | |
472 | debugfs_remove(de->sharpen_duration); | |
473 | debugfs_remove(de->sharpen_factor); | |
474 | debugfs_remove(de->smoothing_shift); | |
475 | debugfs_remove(de->coeff_d); | |
476 | debugfs_remove(de->coeff_i); | |
477 | debugfs_remove(de->coeff_p); | |
478 | debugfs_remove(de->sampling_period); | |
479 | debugfs_remove(de->target); | |
480 | debugfs_remove(de->dir); | |
481 | #endif | |
482 | ||
90d501d6 | 483 | kfree(pinfo->rinfo); |
ad018375 MN |
484 | kfree(pinfo); |
485 | } | |
486 | ||
487 | static void rate_control_pid_clear(void *priv) | |
488 | { | |
489 | } | |
490 | ||
491 | static void *rate_control_pid_alloc_sta(void *priv, gfp_t gfp) | |
492 | { | |
493 | struct rc_pid_sta_info *spinfo; | |
494 | ||
495 | spinfo = kzalloc(sizeof(*spinfo), gfp); | |
12446c67 MN |
496 | if (spinfo == NULL) |
497 | return NULL; | |
498 | ||
c09c7237 SB |
499 | spinfo->last_sample = jiffies; |
500 | ||
12446c67 MN |
501 | #ifdef CONFIG_MAC80211_DEBUGFS |
502 | spin_lock_init(&spinfo->events.lock); | |
503 | init_waitqueue_head(&spinfo->events.waitqueue); | |
504 | #endif | |
ad018375 MN |
505 | |
506 | return spinfo; | |
507 | } | |
508 | ||
509 | static void rate_control_pid_free_sta(void *priv, void *priv_sta) | |
510 | { | |
511 | struct rc_pid_sta_info *spinfo = priv_sta; | |
512 | kfree(spinfo); | |
513 | } | |
514 | ||
4b475898 | 515 | static struct rate_control_ops mac80211_rcpid = { |
ad018375 MN |
516 | .name = "pid", |
517 | .tx_status = rate_control_pid_tx_status, | |
518 | .get_rate = rate_control_pid_get_rate, | |
519 | .rate_init = rate_control_pid_rate_init, | |
520 | .clear = rate_control_pid_clear, | |
521 | .alloc = rate_control_pid_alloc, | |
522 | .free = rate_control_pid_free, | |
523 | .alloc_sta = rate_control_pid_alloc_sta, | |
524 | .free_sta = rate_control_pid_free_sta, | |
12446c67 MN |
525 | #ifdef CONFIG_MAC80211_DEBUGFS |
526 | .add_sta_debugfs = rate_control_pid_add_sta_debugfs, | |
527 | .remove_sta_debugfs = rate_control_pid_remove_sta_debugfs, | |
528 | #endif | |
ad018375 | 529 | }; |
4b475898 JB |
530 | |
531 | MODULE_DESCRIPTION("PID controller based rate control algorithm"); | |
532 | MODULE_AUTHOR("Stefano Brivio"); | |
533 | MODULE_AUTHOR("Mattias Nissler"); | |
534 | MODULE_LICENSE("GPL"); | |
535 | ||
536 | int __init rc80211_pid_init(void) | |
537 | { | |
538 | return ieee80211_rate_control_register(&mac80211_rcpid); | |
539 | } | |
540 | ||
541 | void __exit rc80211_pid_exit(void) | |
542 | { | |
543 | ieee80211_rate_control_unregister(&mac80211_rcpid); | |
544 | } | |
545 | ||
546 | #ifdef CONFIG_MAC80211_RC_PID_MODULE | |
547 | module_init(rc80211_pid_init); | |
548 | module_exit(rc80211_pid_exit); | |
549 | #endif |