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12#include <linux/netdevice.h>
13#include <linux/types.h>
14#include <linux/skbuff.h>
15#include <linux/debugfs.h>
16#include <net/mac80211.h>
17#include "rate.h"
18#include "mesh.h"
19#include "rc80211_pid.h"
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71static 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,
74 struct rc_pid_rateinfo *rinfo)
75{
76 int cur_sorted, new_sorted, probe, tmp, n_bitrates, band;
77 int cur = spinfo->txrate_idx;
78
79 band = sband->band;
80 n_bitrates = sband->n_bitrates;
81
82
83 cur_sorted = rinfo[cur].rev_index;
84 new_sorted = cur_sorted + adj;
85
86
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;
93
94 if (adj < 0) {
95
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
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;
106 }
107
108
109 do {
110 if (rate_supported(sta, band, rinfo[tmp].index)) {
111 spinfo->txrate_idx = rinfo[tmp].index;
112 break;
113 }
114 if (adj < 0)
115 tmp--;
116 else
117 tmp++;
118 } while (tmp < n_bitrates && tmp >= 0);
119
120#ifdef CONFIG_MAC80211_DEBUGFS
121 rate_control_pid_event_rate_change(&spinfo->events,
122 spinfo->txrate_idx,
123 sband->bitrates[spinfo->txrate_idx].bitrate);
124#endif
125}
126
127
128static void rate_control_pid_normalize(struct rc_pid_info *pinfo, int l)
129{
130 int i, norm_offset = pinfo->norm_offset;
131 struct rc_pid_rateinfo *r = pinfo->rinfo;
132
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;
137 for (i = 0; i < l - 1; i++)
138 if (r[i + 1].diff > r[i].diff + norm_offset)
139 r[i + 1].diff -= norm_offset;
140 else if (r[i + 1].diff <= r[i].diff)
141 r[i + 1].diff += norm_offset;
142}
143
144static void rate_control_pid_sample(struct rc_pid_info *pinfo,
145 struct ieee80211_supported_band *sband,
146 struct ieee80211_sta *sta,
147 struct rc_pid_sta_info *spinfo)
148{
149 struct rc_pid_rateinfo *rinfo = pinfo->rinfo;
150 u32 pf;
151 s32 err_avg;
152 u32 err_prop;
153 u32 err_int;
154 u32 err_der;
155 int adj, i, j, tmp;
156 unsigned long period;
157
158
159
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;
165
166 spinfo->last_sample = jiffies;
167
168
169
170 if (unlikely(spinfo->tx_num_xmit == 0))
171 pf = spinfo->last_pf;
172 else
173 pf = spinfo->tx_num_failed * 100 / spinfo->tx_num_xmit;
174
175 spinfo->tx_num_xmit = 0;
176 spinfo->tx_num_failed = 0;
177
178
179 if (pinfo->oldrate != spinfo->txrate_idx) {
180
181 i = rinfo[pinfo->oldrate].rev_index;
182 j = rinfo[spinfo->txrate_idx].rev_index;
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;
188 pinfo->oldrate = spinfo->txrate_idx;
189 }
190 rate_control_pid_normalize(pinfo, sband->n_bitrates);
191
192
193 err_prop = (pinfo->target << RC_PID_ARITH_SHIFT) - pf;
194
195 err_avg = spinfo->err_avg_sc >> pinfo->smoothing_shift;
196 spinfo->err_avg_sc = spinfo->err_avg_sc - err_avg + err_prop;
197 err_int = spinfo->err_avg_sc >> pinfo->smoothing_shift;
198
199 err_der = (pf - spinfo->last_pf) *
200 (1 + pinfo->sharpen_factor * spinfo->sharp_cnt);
201 spinfo->last_pf = pf;
202 if (spinfo->sharp_cnt)
203 spinfo->sharp_cnt--;
204
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
210
211 adj = (err_prop * pinfo->coeff_p + err_int * pinfo->coeff_i
212 + err_der * pinfo->coeff_d);
213 adj = RC_PID_DO_ARITH_RIGHT_SHIFT(adj, 2 * RC_PID_ARITH_SHIFT);
214
215
216 if (adj)
217 rate_control_pid_adjust_rate(sband, sta, spinfo, adj, rinfo);
218}
219
220static void rate_control_pid_tx_status(void *priv, struct ieee80211_supported_band *sband,
221 struct ieee80211_sta *sta, void *priv_sta,
222 struct sk_buff *skb)
223{
224 struct rc_pid_info *pinfo = priv;
225 struct rc_pid_sta_info *spinfo = priv_sta;
226 unsigned long period;
227 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
228
229 if (!spinfo)
230 return;
231
232
233
234 if (info->status.rates[0].idx != spinfo->txrate_idx)
235 return;
236
237 spinfo->tx_num_xmit++;
238
239#ifdef CONFIG_MAC80211_DEBUGFS
240 rate_control_pid_event_tx_status(&spinfo->events, info);
241#endif
242
243
244
245
246 if (!(info->flags & IEEE80211_TX_STAT_ACK)) {
247 spinfo->tx_num_failed += 2;
248 spinfo->tx_num_xmit++;
249 } else if (info->status.rates[0].count > 1) {
250 spinfo->tx_num_failed++;
251 spinfo->tx_num_xmit++;
252 }
253
254
255 period = (HZ * pinfo->sampling_period + 500) / 1000;
256 if (!period)
257 period = 1;
258 if (time_after(jiffies, spinfo->last_sample + period))
259 rate_control_pid_sample(pinfo, sband, sta, spinfo);
260}
261
262static void
263rate_control_pid_get_rate(void *priv, struct ieee80211_sta *sta,
264 void *priv_sta,
265 struct ieee80211_tx_rate_control *txrc)
266{
267 struct sk_buff *skb = txrc->skb;
268 struct ieee80211_supported_band *sband = txrc->sband;
269 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
270 struct rc_pid_sta_info *spinfo = priv_sta;
271 int rateidx;
272
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
280
281 if (rate_control_send_low(sta, priv_sta, txrc))
282 return;
283
284 rateidx = spinfo->txrate_idx;
285
286 if (rateidx >= sband->n_bitrates)
287 rateidx = sband->n_bitrates - 1;
288
289 info->control.rates[0].idx = rateidx;
290
291#ifdef CONFIG_MAC80211_DEBUGFS
292 rate_control_pid_event_tx_rate(&spinfo->events,
293 rateidx, sband->bitrates[rateidx].bitrate);
294#endif
295}
296
297static void
298rate_control_pid_rate_init(void *priv, struct ieee80211_supported_band *sband,
299 struct ieee80211_sta *sta, void *priv_sta)
300{
301 struct rc_pid_sta_info *spinfo = priv_sta;
302 struct rc_pid_info *pinfo = priv;
303 struct rc_pid_rateinfo *rinfo = pinfo->rinfo;
304 int i, j, tmp;
305 bool s;
306
307
308
309
310
311
312
313
314
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
339 spinfo->txrate_idx = rate_lowest_index(sband, sta);
340}
341
342static void *rate_control_pid_alloc(struct ieee80211_hw *hw,
343 struct dentry *debugfsdir)
344{
345 struct rc_pid_info *pinfo;
346 struct rc_pid_rateinfo *rinfo;
347 struct ieee80211_supported_band *sband;
348 int i, max_rates = 0;
349#ifdef CONFIG_MAC80211_DEBUGFS
350 struct rc_pid_debugfs_entries *de;
351#endif
352
353 pinfo = kmalloc(sizeof(*pinfo), GFP_ATOMIC);
354 if (!pinfo)
355 return NULL;
356
357 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
358 sband = hw->wiphy->bands[i];
359 if (sband && sband->n_bitrates > max_rates)
360 max_rates = sband->n_bitrates;
361 }
362
363 rinfo = kmalloc(sizeof(*rinfo) * max_rates, GFP_ATOMIC);
364 if (!rinfo) {
365 kfree(pinfo);
366 return NULL;
367 }
368
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
381#ifdef CONFIG_MAC80211_DEBUGFS
382 de = &pinfo->dentries;
383 de->target = debugfs_create_u32("target_pf", S_IRUSR | S_IWUSR,
384 debugfsdir, &pinfo->target);
385 de->sampling_period = debugfs_create_u32("sampling_period",
386 S_IRUSR | S_IWUSR, debugfsdir,
387 &pinfo->sampling_period);
388 de->coeff_p = debugfs_create_u32("coeff_p", S_IRUSR | S_IWUSR,
389 debugfsdir, (u32 *)&pinfo->coeff_p);
390 de->coeff_i = debugfs_create_u32("coeff_i", S_IRUSR | S_IWUSR,
391 debugfsdir, (u32 *)&pinfo->coeff_i);
392 de->coeff_d = debugfs_create_u32("coeff_d", S_IRUSR | S_IWUSR,
393 debugfsdir, (u32 *)&pinfo->coeff_d);
394 de->smoothing_shift = debugfs_create_u32("smoothing_shift",
395 S_IRUSR | S_IWUSR, debugfsdir,
396 &pinfo->smoothing_shift);
397 de->sharpen_factor = debugfs_create_u32("sharpen_factor",
398 S_IRUSR | S_IWUSR, debugfsdir,
399 &pinfo->sharpen_factor);
400 de->sharpen_duration = debugfs_create_u32("sharpen_duration",
401 S_IRUSR | S_IWUSR, debugfsdir,
402 &pinfo->sharpen_duration);
403 de->norm_offset = debugfs_create_u32("norm_offset",
404 S_IRUSR | S_IWUSR, debugfsdir,
405 &pinfo->norm_offset);
406#endif
407
408 return pinfo;
409}
410
411static void rate_control_pid_free(void *priv)
412{
413 struct rc_pid_info *pinfo = priv;
414#ifdef CONFIG_MAC80211_DEBUGFS
415 struct rc_pid_debugfs_entries *de = &pinfo->dentries;
416
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);
426#endif
427
428 kfree(pinfo->rinfo);
429 kfree(pinfo);
430}
431
432static void *rate_control_pid_alloc_sta(void *priv, struct ieee80211_sta *sta,
433 gfp_t gfp)
434{
435 struct rc_pid_sta_info *spinfo;
436
437 spinfo = kzalloc(sizeof(*spinfo), gfp);
438 if (spinfo == NULL)
439 return NULL;
440
441 spinfo->last_sample = jiffies;
442
443#ifdef CONFIG_MAC80211_DEBUGFS
444 spin_lock_init(&spinfo->events.lock);
445 init_waitqueue_head(&spinfo->events.waitqueue);
446#endif
447
448 return spinfo;
449}
450
451static void rate_control_pid_free_sta(void *priv, struct ieee80211_sta *sta,
452 void *priv_sta)
453{
454 kfree(priv_sta);
455}
456
457static struct rate_control_ops mac80211_rcpid = {
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,
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,
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
470};
471
472int __init rc80211_pid_init(void)
473{
474 return ieee80211_rate_control_register(&mac80211_rcpid);
475}
476
477void rc80211_pid_exit(void)
478{
479 ieee80211_rate_control_unregister(&mac80211_rcpid);
480}
481