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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. */ | |
ad018375 | 71 | static void rate_control_pid_adjust_rate(struct ieee80211_local *local, |
90d501d6 SB |
72 | struct sta_info *sta, int adj, |
73 | struct rc_pid_rateinfo *rinfo) | |
ad018375 MN |
74 | { |
75 | struct ieee80211_sub_if_data *sdata; | |
8318d78a | 76 | struct ieee80211_supported_band *sband; |
b7c50de9 SB |
77 | int cur_sorted, new_sorted, probe, tmp, n_bitrates, band; |
78 | int cur = sta->txrate_idx; | |
ad018375 | 79 | |
d0709a65 | 80 | sdata = sta->sdata; |
8318d78a | 81 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; |
b7c50de9 SB |
82 | band = sband->band; |
83 | n_bitrates = sband->n_bitrates; | |
ad018375 | 84 | |
b7c50de9 SB |
85 | /* Map passed arguments to sorted values. */ |
86 | cur_sorted = rinfo[cur].rev_index; | |
87 | new_sorted = cur_sorted + adj; | |
ad018375 | 88 | |
b7c50de9 SB |
89 | /* Check limits. */ |
90 | if (new_sorted < 0) | |
91 | new_sorted = rinfo[0].rev_index; | |
92 | else if (new_sorted >= n_bitrates) | |
93 | new_sorted = rinfo[n_bitrates - 1].rev_index; | |
94 | ||
95 | tmp = new_sorted; | |
ad018375 | 96 | |
b7c50de9 SB |
97 | if (adj < 0) { |
98 | /* Ensure that the rate decrease isn't disadvantageous. */ | |
99 | for (probe = cur_sorted; probe >= new_sorted; probe--) | |
100 | if (rinfo[probe].diff <= rinfo[cur_sorted].diff && | |
101 | rate_supported(sta, band, rinfo[probe].index)) | |
102 | tmp = probe; | |
103 | } else { | |
104 | /* Look for rate increase with zero (or below) cost. */ | |
105 | for (probe = new_sorted + 1; probe < n_bitrates; probe++) | |
106 | if (rinfo[probe].diff <= rinfo[new_sorted].diff && | |
107 | rate_supported(sta, band, rinfo[probe].index)) | |
108 | tmp = probe; | |
ad018375 | 109 | } |
12446c67 | 110 | |
b7c50de9 SB |
111 | /* Fit the rate found to the nearest supported rate. */ |
112 | do { | |
113 | if (rate_supported(sta, band, rinfo[tmp].index)) { | |
114 | sta->txrate_idx = rinfo[tmp].index; | |
115 | break; | |
116 | } | |
117 | if (adj < 0) | |
118 | tmp--; | |
119 | else | |
120 | tmp++; | |
121 | } while (tmp < n_bitrates && tmp >= 0); | |
122 | ||
12446c67 MN |
123 | #ifdef CONFIG_MAC80211_DEBUGFS |
124 | rate_control_pid_event_rate_change( | |
125 | &((struct rc_pid_sta_info *)sta->rate_ctrl_priv)->events, | |
b7c50de9 | 126 | sta->txrate_idx, sband->bitrates[sta->txrate_idx].bitrate); |
12446c67 | 127 | #endif |
ad018375 MN |
128 | } |
129 | ||
90d501d6 | 130 | /* Normalize the failed frames per-rate differences. */ |
1946b74c | 131 | static void rate_control_pid_normalize(struct rc_pid_info *pinfo, int l) |
90d501d6 | 132 | { |
1946b74c MN |
133 | int i, norm_offset = pinfo->norm_offset; |
134 | struct rc_pid_rateinfo *r = pinfo->rinfo; | |
90d501d6 | 135 | |
1946b74c MN |
136 | if (r[0].diff > norm_offset) |
137 | r[0].diff -= norm_offset; | |
138 | else if (r[0].diff < -norm_offset) | |
139 | r[0].diff += norm_offset; | |
90d501d6 | 140 | for (i = 0; i < l - 1; i++) |
1946b74c MN |
141 | if (r[i + 1].diff > r[i].diff + norm_offset) |
142 | r[i + 1].diff -= norm_offset; | |
90d501d6 | 143 | else if (r[i + 1].diff <= r[i].diff) |
1946b74c | 144 | r[i + 1].diff += norm_offset; |
90d501d6 SB |
145 | } |
146 | ||
ad018375 MN |
147 | static void rate_control_pid_sample(struct rc_pid_info *pinfo, |
148 | struct ieee80211_local *local, | |
149 | struct sta_info *sta) | |
150 | { | |
ee385855 | 151 | #ifdef CONFIG_MAC80211_MESH |
d0709a65 | 152 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
ee385855 | 153 | #endif |
ad018375 | 154 | struct rc_pid_sta_info *spinfo = sta->rate_ctrl_priv; |
90d501d6 | 155 | struct rc_pid_rateinfo *rinfo = pinfo->rinfo; |
8318d78a | 156 | struct ieee80211_supported_band *sband; |
ad018375 MN |
157 | u32 pf; |
158 | s32 err_avg; | |
1946b74c MN |
159 | u32 err_prop; |
160 | u32 err_int; | |
161 | u32 err_der; | |
90d501d6 | 162 | int adj, i, j, tmp; |
1946b74c | 163 | unsigned long period; |
ad018375 | 164 | |
8318d78a | 165 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; |
ad018375 | 166 | spinfo = sta->rate_ctrl_priv; |
1dc4d1e6 SB |
167 | |
168 | /* In case nothing happened during the previous control interval, turn | |
169 | * the sharpening factor on. */ | |
1946b74c MN |
170 | period = (HZ * pinfo->sampling_period + 500) / 1000; |
171 | if (!period) | |
172 | period = 1; | |
173 | if (jiffies - spinfo->last_sample > 2 * period) | |
174 | spinfo->sharp_cnt = pinfo->sharpen_duration; | |
1dc4d1e6 | 175 | |
ad018375 MN |
176 | spinfo->last_sample = jiffies; |
177 | ||
1dc4d1e6 | 178 | /* This should never happen, but in case, we assume the old sample is |
ad018375 | 179 | * still a good measurement and copy it. */ |
1dc4d1e6 | 180 | if (unlikely(spinfo->tx_num_xmit == 0)) |
ad018375 MN |
181 | pf = spinfo->last_pf; |
182 | else { | |
183 | pf = spinfo->tx_num_failed * 100 / spinfo->tx_num_xmit; | |
ee385855 LCC |
184 | #ifdef CONFIG_MAC80211_MESH |
185 | if (pf == 100 && | |
186 | sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) | |
187 | mesh_plink_broken(sta); | |
188 | #endif | |
ad018375 | 189 | pf <<= RC_PID_ARITH_SHIFT; |
ee385855 LCC |
190 | sta->fail_avg = ((pf + (spinfo->last_pf << 3)) / 9) |
191 | >> RC_PID_ARITH_SHIFT; | |
ad018375 MN |
192 | } |
193 | ||
1dc4d1e6 SB |
194 | spinfo->tx_num_xmit = 0; |
195 | spinfo->tx_num_failed = 0; | |
196 | ||
90d501d6 | 197 | /* If we just switched rate, update the rate behaviour info. */ |
8318d78a | 198 | if (pinfo->oldrate != sta->txrate_idx) { |
90d501d6 SB |
199 | |
200 | i = rinfo[pinfo->oldrate].rev_index; | |
8318d78a | 201 | j = rinfo[sta->txrate_idx].rev_index; |
90d501d6 SB |
202 | |
203 | tmp = (pf - spinfo->last_pf); | |
204 | tmp = RC_PID_DO_ARITH_RIGHT_SHIFT(tmp, RC_PID_ARITH_SHIFT); | |
205 | ||
206 | rinfo[j].diff = rinfo[i].diff + tmp; | |
8318d78a | 207 | pinfo->oldrate = sta->txrate_idx; |
90d501d6 | 208 | } |
8318d78a | 209 | rate_control_pid_normalize(pinfo, sband->n_bitrates); |
90d501d6 | 210 | |
ad018375 | 211 | /* Compute the proportional, integral and derivative errors. */ |
426706c0 | 212 | err_prop = (pinfo->target << RC_PID_ARITH_SHIFT) - pf; |
ad018375 | 213 | |
1946b74c | 214 | err_avg = spinfo->err_avg_sc >> pinfo->smoothing_shift; |
ad018375 | 215 | spinfo->err_avg_sc = spinfo->err_avg_sc - err_avg + err_prop; |
1946b74c | 216 | err_int = spinfo->err_avg_sc >> pinfo->smoothing_shift; |
ad018375 | 217 | |
1946b74c MN |
218 | err_der = (pf - spinfo->last_pf) * |
219 | (1 + pinfo->sharpen_factor * spinfo->sharp_cnt); | |
ad018375 | 220 | spinfo->last_pf = pf; |
1dc4d1e6 SB |
221 | if (spinfo->sharp_cnt) |
222 | spinfo->sharp_cnt--; | |
ad018375 | 223 | |
12446c67 MN |
224 | #ifdef CONFIG_MAC80211_DEBUGFS |
225 | rate_control_pid_event_pf_sample(&spinfo->events, pf, err_prop, err_int, | |
226 | err_der); | |
227 | #endif | |
228 | ||
ad018375 MN |
229 | /* Compute the controller output. */ |
230 | adj = (err_prop * pinfo->coeff_p + err_int * pinfo->coeff_i | |
231 | + err_der * pinfo->coeff_d); | |
90d501d6 | 232 | adj = RC_PID_DO_ARITH_RIGHT_SHIFT(adj, 2 * RC_PID_ARITH_SHIFT); |
ad018375 MN |
233 | |
234 | /* Change rate. */ | |
235 | if (adj) | |
90d501d6 | 236 | rate_control_pid_adjust_rate(local, sta, adj, rinfo); |
ad018375 MN |
237 | } |
238 | ||
239 | static void rate_control_pid_tx_status(void *priv, struct net_device *dev, | |
e039fa4a | 240 | struct sk_buff *skb) |
ad018375 MN |
241 | { |
242 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
243 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
df26e7ea | 244 | struct ieee80211_sub_if_data *sdata; |
ad018375 MN |
245 | struct rc_pid_info *pinfo = priv; |
246 | struct sta_info *sta; | |
247 | struct rc_pid_sta_info *spinfo; | |
1946b74c | 248 | unsigned long period; |
8318d78a | 249 | struct ieee80211_supported_band *sband; |
e039fa4a | 250 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
ad018375 | 251 | |
d0709a65 JB |
252 | rcu_read_lock(); |
253 | ||
ad018375 | 254 | sta = sta_info_get(local, hdr->addr1); |
8318d78a | 255 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; |
ad018375 MN |
256 | |
257 | if (!sta) | |
d0709a65 | 258 | goto unlock; |
ad018375 | 259 | |
df26e7ea | 260 | /* Don't update the state if we're not controlling the rate. */ |
d0709a65 | 261 | sdata = sta->sdata; |
3e122be0 JB |
262 | if (sdata->force_unicast_rateidx > -1) { |
263 | sta->txrate_idx = sdata->max_ratectrl_rateidx; | |
d0709a65 | 264 | goto unlock; |
df26e7ea AL |
265 | } |
266 | ||
ad018375 MN |
267 | /* Ignore all frames that were sent with a different rate than the rate |
268 | * we currently advise mac80211 to use. */ | |
e039fa4a | 269 | if (info->tx_rate_idx != sta->txrate_idx) |
d0709a65 | 270 | goto unlock; |
ad018375 MN |
271 | |
272 | spinfo = sta->rate_ctrl_priv; | |
273 | spinfo->tx_num_xmit++; | |
274 | ||
12446c67 | 275 | #ifdef CONFIG_MAC80211_DEBUGFS |
e039fa4a | 276 | rate_control_pid_event_tx_status(&spinfo->events, info); |
12446c67 MN |
277 | #endif |
278 | ||
ad018375 MN |
279 | /* We count frames that totally failed to be transmitted as two bad |
280 | * frames, those that made it out but had some retries as one good and | |
281 | * one bad frame. */ | |
e039fa4a | 282 | if (info->status.excessive_retries) { |
ad018375 MN |
283 | spinfo->tx_num_failed += 2; |
284 | spinfo->tx_num_xmit++; | |
e039fa4a | 285 | } else if (info->status.retry_count) { |
ad018375 MN |
286 | spinfo->tx_num_failed++; |
287 | spinfo->tx_num_xmit++; | |
288 | } | |
289 | ||
e039fa4a | 290 | if (info->status.excessive_retries) { |
ad018375 MN |
291 | sta->tx_retry_failed++; |
292 | sta->tx_num_consecutive_failures++; | |
293 | sta->tx_num_mpdu_fail++; | |
294 | } else { | |
ad018375 MN |
295 | sta->tx_num_consecutive_failures = 0; |
296 | sta->tx_num_mpdu_ok++; | |
297 | } | |
e039fa4a JB |
298 | sta->tx_retry_count += info->status.retry_count; |
299 | sta->tx_num_mpdu_fail += info->status.retry_count; | |
ad018375 MN |
300 | |
301 | /* Update PID controller state. */ | |
1946b74c MN |
302 | period = (HZ * pinfo->sampling_period + 500) / 1000; |
303 | if (!period) | |
304 | period = 1; | |
305 | if (time_after(jiffies, spinfo->last_sample + period)) | |
ad018375 MN |
306 | rate_control_pid_sample(pinfo, local, sta); |
307 | ||
d0709a65 JB |
308 | unlock: |
309 | rcu_read_unlock(); | |
ad018375 MN |
310 | } |
311 | ||
312 | static void rate_control_pid_get_rate(void *priv, struct net_device *dev, | |
8318d78a | 313 | struct ieee80211_supported_band *sband, |
ad018375 MN |
314 | struct sk_buff *skb, |
315 | struct rate_selection *sel) | |
316 | { | |
317 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
318 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
2bc454b0 | 319 | struct ieee80211_sub_if_data *sdata; |
ad018375 MN |
320 | struct sta_info *sta; |
321 | int rateidx; | |
2bc454b0 | 322 | u16 fc; |
ad018375 | 323 | |
d0709a65 JB |
324 | rcu_read_lock(); |
325 | ||
ad018375 MN |
326 | sta = sta_info_get(local, hdr->addr1); |
327 | ||
2bc454b0 MW |
328 | /* Send management frames and broadcast/multicast data using lowest |
329 | * rate. */ | |
330 | fc = le16_to_cpu(hdr->frame_control); | |
331 | if ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA || | |
332 | is_multicast_ether_addr(hdr->addr1) || !sta) { | |
2e92e6f2 | 333 | sel->rate_idx = rate_lowest_index(local, sband, sta); |
d0709a65 | 334 | rcu_read_unlock(); |
ad018375 MN |
335 | return; |
336 | } | |
337 | ||
2bc454b0 MW |
338 | /* If a forced rate is in effect, select it. */ |
339 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
3e122be0 JB |
340 | if (sdata->force_unicast_rateidx > -1) |
341 | sta->txrate_idx = sdata->force_unicast_rateidx; | |
2bc454b0 | 342 | |
8318d78a | 343 | rateidx = sta->txrate_idx; |
ad018375 | 344 | |
8318d78a JB |
345 | if (rateidx >= sband->n_bitrates) |
346 | rateidx = sband->n_bitrates - 1; | |
ad018375 | 347 | |
8318d78a | 348 | sta->last_txrate_idx = rateidx; |
2bc454b0 | 349 | |
d0709a65 | 350 | rcu_read_unlock(); |
ad018375 | 351 | |
2e92e6f2 | 352 | sel->rate_idx = rateidx; |
12446c67 MN |
353 | |
354 | #ifdef CONFIG_MAC80211_DEBUGFS | |
355 | rate_control_pid_event_tx_rate( | |
356 | &((struct rc_pid_sta_info *) sta->rate_ctrl_priv)->events, | |
8318d78a | 357 | rateidx, sband->bitrates[rateidx].bitrate); |
12446c67 | 358 | #endif |
ad018375 MN |
359 | } |
360 | ||
361 | static void rate_control_pid_rate_init(void *priv, void *priv_sta, | |
362 | struct ieee80211_local *local, | |
363 | struct sta_info *sta) | |
364 | { | |
365 | /* TODO: This routine should consider using RSSI from previous packets | |
366 | * as we need to have IEEE 802.1X auth succeed immediately after assoc.. | |
367 | * Until that method is implemented, we will use the lowest supported | |
368 | * rate as a workaround. */ | |
8318d78a JB |
369 | struct ieee80211_supported_band *sband; |
370 | ||
371 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; | |
372 | sta->txrate_idx = rate_lowest_index(local, sband, sta); | |
ee385855 | 373 | sta->fail_avg = 0; |
ad018375 MN |
374 | } |
375 | ||
376 | static void *rate_control_pid_alloc(struct ieee80211_local *local) | |
377 | { | |
378 | struct rc_pid_info *pinfo; | |
90d501d6 | 379 | struct rc_pid_rateinfo *rinfo; |
8318d78a | 380 | struct ieee80211_supported_band *sband; |
90d501d6 SB |
381 | int i, j, tmp; |
382 | bool s; | |
1946b74c MN |
383 | #ifdef CONFIG_MAC80211_DEBUGFS |
384 | struct rc_pid_debugfs_entries *de; | |
385 | #endif | |
ad018375 | 386 | |
8318d78a JB |
387 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; |
388 | ||
ad018375 | 389 | pinfo = kmalloc(sizeof(*pinfo), GFP_ATOMIC); |
90d501d6 SB |
390 | if (!pinfo) |
391 | return NULL; | |
392 | ||
8318d78a | 393 | /* We can safely assume that sband won't change unless we get |
90d501d6 | 394 | * reinitialized. */ |
8318d78a | 395 | rinfo = kmalloc(sizeof(*rinfo) * sband->n_bitrates, GFP_ATOMIC); |
90d501d6 SB |
396 | if (!rinfo) { |
397 | kfree(pinfo); | |
398 | return NULL; | |
399 | } | |
400 | ||
adeed480 MN |
401 | pinfo->target = RC_PID_TARGET_PF; |
402 | pinfo->sampling_period = RC_PID_INTERVAL; | |
403 | pinfo->coeff_p = RC_PID_COEFF_P; | |
404 | pinfo->coeff_i = RC_PID_COEFF_I; | |
405 | pinfo->coeff_d = RC_PID_COEFF_D; | |
406 | pinfo->smoothing_shift = RC_PID_SMOOTHING_SHIFT; | |
407 | pinfo->sharpen_factor = RC_PID_SHARPENING_FACTOR; | |
408 | pinfo->sharpen_duration = RC_PID_SHARPENING_DURATION; | |
409 | pinfo->norm_offset = RC_PID_NORM_OFFSET; | |
410 | pinfo->rinfo = rinfo; | |
411 | pinfo->oldrate = 0; | |
412 | ||
90d501d6 SB |
413 | /* Sort the rates. This is optimized for the most common case (i.e. |
414 | * almost-sorted CCK+OFDM rates). Kind of bubble-sort with reversed | |
415 | * mapping too. */ | |
8318d78a | 416 | for (i = 0; i < sband->n_bitrates; i++) { |
90d501d6 SB |
417 | rinfo[i].index = i; |
418 | rinfo[i].rev_index = i; | |
adeed480 | 419 | if (RC_PID_FAST_START) |
90d501d6 SB |
420 | rinfo[i].diff = 0; |
421 | else | |
1946b74c | 422 | rinfo[i].diff = i * pinfo->norm_offset; |
90d501d6 | 423 | } |
8318d78a | 424 | for (i = 1; i < sband->n_bitrates; i++) { |
90d501d6 | 425 | s = 0; |
8318d78a JB |
426 | for (j = 0; j < sband->n_bitrates - i; j++) |
427 | if (unlikely(sband->bitrates[rinfo[j].index].bitrate > | |
428 | sband->bitrates[rinfo[j + 1].index].bitrate)) { | |
90d501d6 SB |
429 | tmp = rinfo[j].index; |
430 | rinfo[j].index = rinfo[j + 1].index; | |
431 | rinfo[j + 1].index = tmp; | |
432 | rinfo[rinfo[j].index].rev_index = j; | |
433 | rinfo[rinfo[j + 1].index].rev_index = j + 1; | |
434 | s = 1; | |
435 | } | |
436 | if (!s) | |
437 | break; | |
438 | } | |
ad018375 | 439 | |
1946b74c MN |
440 | #ifdef CONFIG_MAC80211_DEBUGFS |
441 | de = &pinfo->dentries; | |
442 | de->dir = debugfs_create_dir("rc80211_pid", | |
443 | local->hw.wiphy->debugfsdir); | |
444 | de->target = debugfs_create_u32("target_pf", S_IRUSR | S_IWUSR, | |
445 | de->dir, &pinfo->target); | |
446 | de->sampling_period = debugfs_create_u32("sampling_period", | |
447 | S_IRUSR | S_IWUSR, de->dir, | |
448 | &pinfo->sampling_period); | |
449 | de->coeff_p = debugfs_create_u32("coeff_p", S_IRUSR | S_IWUSR, | |
450 | de->dir, &pinfo->coeff_p); | |
451 | de->coeff_i = debugfs_create_u32("coeff_i", S_IRUSR | S_IWUSR, | |
452 | de->dir, &pinfo->coeff_i); | |
453 | de->coeff_d = debugfs_create_u32("coeff_d", S_IRUSR | S_IWUSR, | |
454 | de->dir, &pinfo->coeff_d); | |
455 | de->smoothing_shift = debugfs_create_u32("smoothing_shift", | |
456 | S_IRUSR | S_IWUSR, de->dir, | |
457 | &pinfo->smoothing_shift); | |
458 | de->sharpen_factor = debugfs_create_u32("sharpen_factor", | |
459 | S_IRUSR | S_IWUSR, de->dir, | |
460 | &pinfo->sharpen_factor); | |
461 | de->sharpen_duration = debugfs_create_u32("sharpen_duration", | |
462 | S_IRUSR | S_IWUSR, de->dir, | |
463 | &pinfo->sharpen_duration); | |
464 | de->norm_offset = debugfs_create_u32("norm_offset", | |
465 | S_IRUSR | S_IWUSR, de->dir, | |
466 | &pinfo->norm_offset); | |
1946b74c MN |
467 | #endif |
468 | ||
ad018375 MN |
469 | return pinfo; |
470 | } | |
471 | ||
472 | static void rate_control_pid_free(void *priv) | |
473 | { | |
474 | struct rc_pid_info *pinfo = priv; | |
1946b74c MN |
475 | #ifdef CONFIG_MAC80211_DEBUGFS |
476 | struct rc_pid_debugfs_entries *de = &pinfo->dentries; | |
477 | ||
1946b74c MN |
478 | debugfs_remove(de->norm_offset); |
479 | debugfs_remove(de->sharpen_duration); | |
480 | debugfs_remove(de->sharpen_factor); | |
481 | debugfs_remove(de->smoothing_shift); | |
482 | debugfs_remove(de->coeff_d); | |
483 | debugfs_remove(de->coeff_i); | |
484 | debugfs_remove(de->coeff_p); | |
485 | debugfs_remove(de->sampling_period); | |
486 | debugfs_remove(de->target); | |
487 | debugfs_remove(de->dir); | |
488 | #endif | |
489 | ||
90d501d6 | 490 | kfree(pinfo->rinfo); |
ad018375 MN |
491 | kfree(pinfo); |
492 | } | |
493 | ||
494 | static void rate_control_pid_clear(void *priv) | |
495 | { | |
496 | } | |
497 | ||
498 | static void *rate_control_pid_alloc_sta(void *priv, gfp_t gfp) | |
499 | { | |
500 | struct rc_pid_sta_info *spinfo; | |
501 | ||
502 | spinfo = kzalloc(sizeof(*spinfo), gfp); | |
12446c67 MN |
503 | if (spinfo == NULL) |
504 | return NULL; | |
505 | ||
c09c7237 SB |
506 | spinfo->last_sample = jiffies; |
507 | ||
12446c67 MN |
508 | #ifdef CONFIG_MAC80211_DEBUGFS |
509 | spin_lock_init(&spinfo->events.lock); | |
510 | init_waitqueue_head(&spinfo->events.waitqueue); | |
511 | #endif | |
ad018375 MN |
512 | |
513 | return spinfo; | |
514 | } | |
515 | ||
516 | static void rate_control_pid_free_sta(void *priv, void *priv_sta) | |
517 | { | |
518 | struct rc_pid_sta_info *spinfo = priv_sta; | |
519 | kfree(spinfo); | |
520 | } | |
521 | ||
4b475898 | 522 | static struct rate_control_ops mac80211_rcpid = { |
ad018375 MN |
523 | .name = "pid", |
524 | .tx_status = rate_control_pid_tx_status, | |
525 | .get_rate = rate_control_pid_get_rate, | |
526 | .rate_init = rate_control_pid_rate_init, | |
527 | .clear = rate_control_pid_clear, | |
528 | .alloc = rate_control_pid_alloc, | |
529 | .free = rate_control_pid_free, | |
530 | .alloc_sta = rate_control_pid_alloc_sta, | |
531 | .free_sta = rate_control_pid_free_sta, | |
12446c67 MN |
532 | #ifdef CONFIG_MAC80211_DEBUGFS |
533 | .add_sta_debugfs = rate_control_pid_add_sta_debugfs, | |
534 | .remove_sta_debugfs = rate_control_pid_remove_sta_debugfs, | |
535 | #endif | |
ad018375 | 536 | }; |
4b475898 | 537 | |
4b475898 JB |
538 | int __init rc80211_pid_init(void) |
539 | { | |
540 | return ieee80211_rate_control_register(&mac80211_rcpid); | |
541 | } | |
542 | ||
f0b9205c | 543 | void rc80211_pid_exit(void) |
4b475898 JB |
544 | { |
545 | ieee80211_rate_control_unregister(&mac80211_rcpid); | |
546 | } |