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-rw-r--r--net/mac80211/rc80211_simple.c394
1 files changed, 0 insertions, 394 deletions
diff --git a/net/mac80211/rc80211_simple.c b/net/mac80211/rc80211_simple.c
deleted file mode 100644
index 4f72fdca7f12..000000000000
--- a/net/mac80211/rc80211_simple.c
+++ /dev/null
@@ -1,394 +0,0 @@
1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005, Devicescape Software, Inc.
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9
10#include <linux/jiffies.h>
11#include <linux/init.h>
12#include <linux/netdevice.h>
13#include <linux/types.h>
14#include <linux/slab.h>
15#include <linux/skbuff.h>
16#include <linux/compiler.h>
17#include <linux/module.h>
18
19#include <net/mac80211.h>
20#include "ieee80211_i.h"
21#include "ieee80211_rate.h"
22#include "debugfs.h"
23
24
25/* This is a minimal implementation of TX rate controlling that can be used
26 * as the default when no improved mechanisms are available. */
27
28#define RATE_CONTROL_NUM_DOWN 20
29#define RATE_CONTROL_NUM_UP 15
30
31#define RATE_CONTROL_EMERG_DEC 2
32#define RATE_CONTROL_INTERVAL (HZ / 20)
33#define RATE_CONTROL_MIN_TX 10
34
35static void rate_control_rate_inc(struct ieee80211_local *local,
36 struct sta_info *sta)
37{
38 struct ieee80211_sub_if_data *sdata;
39 struct ieee80211_supported_band *sband;
40 int i = sta->txrate_idx;
41 int maxrate;
42
43 sdata = sta->sdata;
44 if (sdata->bss && sdata->bss->force_unicast_rateidx > -1) {
45 /* forced unicast rate - do not change STA rate */
46 return;
47 }
48
49 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
50 maxrate = sdata->bss ? sdata->bss->max_ratectrl_rateidx : -1;
51
52 if (i > sband->n_bitrates)
53 i = sband->n_bitrates - 2;
54
55 while (i + 1 < sband->n_bitrates) {
56 i++;
57 if (rate_supported(sta, sband->band, i) &&
58 (maxrate < 0 || i <= maxrate)) {
59 sta->txrate_idx = i;
60 break;
61 }
62 }
63}
64
65
66static void rate_control_rate_dec(struct ieee80211_local *local,
67 struct sta_info *sta)
68{
69 struct ieee80211_sub_if_data *sdata;
70 struct ieee80211_supported_band *sband;
71 int i = sta->txrate_idx;
72
73 sdata = sta->sdata;
74 if (sdata->bss && sdata->bss->force_unicast_rateidx > -1) {
75 /* forced unicast rate - do not change STA rate */
76 return;
77 }
78
79 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
80 if (i > sband->n_bitrates)
81 i = sband->n_bitrates;
82
83 while (i > 0) {
84 i--;
85 if (rate_supported(sta, sband->band, i)) {
86 sta->txrate_idx = i;
87 break;
88 }
89 }
90}
91
92struct global_rate_control {
93 int dummy;
94};
95
96struct sta_rate_control {
97 unsigned long last_rate_change;
98 u32 tx_num_failures;
99 u32 tx_num_xmit;
100
101 unsigned long avg_rate_update;
102 u32 tx_avg_rate_sum;
103 u32 tx_avg_rate_num;
104
105#ifdef CONFIG_MAC80211_DEBUGFS
106 struct dentry *tx_avg_rate_sum_dentry;
107 struct dentry *tx_avg_rate_num_dentry;
108#endif
109};
110
111
112static void rate_control_simple_tx_status(void *priv, struct net_device *dev,
113 struct sk_buff *skb,
114 struct ieee80211_tx_status *status)
115{
116 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
117 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
118 struct sta_info *sta;
119 struct sta_rate_control *srctrl;
120
121 rcu_read_lock();
122
123 sta = sta_info_get(local, hdr->addr1);
124
125 if (!sta)
126 goto unlock;
127
128 srctrl = sta->rate_ctrl_priv;
129 srctrl->tx_num_xmit++;
130 if (status->excessive_retries) {
131 srctrl->tx_num_failures++;
132 sta->tx_retry_failed++;
133 sta->tx_num_consecutive_failures++;
134 sta->tx_num_mpdu_fail++;
135 } else {
136 sta->tx_num_consecutive_failures = 0;
137 sta->tx_num_mpdu_ok++;
138 }
139 sta->tx_retry_count += status->retry_count;
140 sta->tx_num_mpdu_fail += status->retry_count;
141
142 if (time_after(jiffies,
143 srctrl->last_rate_change + RATE_CONTROL_INTERVAL) &&
144 srctrl->tx_num_xmit > RATE_CONTROL_MIN_TX) {
145 u32 per_failed;
146 srctrl->last_rate_change = jiffies;
147
148 per_failed = (100 * sta->tx_num_mpdu_fail) /
149 (sta->tx_num_mpdu_fail + sta->tx_num_mpdu_ok);
150 /* TODO: calculate average per_failed to make adjusting
151 * parameters easier */
152#if 0
153 if (net_ratelimit()) {
154 printk(KERN_DEBUG "MPDU fail=%d ok=%d per_failed=%d\n",
155 sta->tx_num_mpdu_fail, sta->tx_num_mpdu_ok,
156 per_failed);
157 }
158#endif
159
160 /*
161 * XXX: Make these configurable once we have an
162 * interface to the rate control algorithms
163 */
164 if (per_failed > RATE_CONTROL_NUM_DOWN) {
165 rate_control_rate_dec(local, sta);
166 } else if (per_failed < RATE_CONTROL_NUM_UP) {
167 rate_control_rate_inc(local, sta);
168 }
169 srctrl->tx_avg_rate_sum += status->control.tx_rate->bitrate;
170 srctrl->tx_avg_rate_num++;
171 srctrl->tx_num_failures = 0;
172 srctrl->tx_num_xmit = 0;
173 } else if (sta->tx_num_consecutive_failures >=
174 RATE_CONTROL_EMERG_DEC) {
175 rate_control_rate_dec(local, sta);
176 }
177
178 if (time_after(jiffies, srctrl->avg_rate_update + 60 * HZ)) {
179 srctrl->avg_rate_update = jiffies;
180 if (srctrl->tx_avg_rate_num > 0) {
181#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
182 DECLARE_MAC_BUF(mac);
183 printk(KERN_DEBUG "%s: STA %s Average rate: "
184 "%d (%d/%d)\n",
185 dev->name, print_mac(mac, sta->addr),
186 srctrl->tx_avg_rate_sum /
187 srctrl->tx_avg_rate_num,
188 srctrl->tx_avg_rate_sum,
189 srctrl->tx_avg_rate_num);
190#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
191 srctrl->tx_avg_rate_sum = 0;
192 srctrl->tx_avg_rate_num = 0;
193 }
194 }
195
196 unlock:
197 rcu_read_unlock();
198}
199
200
201static void
202rate_control_simple_get_rate(void *priv, struct net_device *dev,
203 struct ieee80211_supported_band *sband,
204 struct sk_buff *skb,
205 struct rate_selection *sel)
206{
207 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
208 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
209 struct ieee80211_sub_if_data *sdata;
210 struct sta_info *sta;
211 int rateidx;
212 u16 fc;
213
214 rcu_read_lock();
215
216 sta = sta_info_get(local, hdr->addr1);
217
218 /* Send management frames and broadcast/multicast data using lowest
219 * rate. */
220 fc = le16_to_cpu(hdr->frame_control);
221 if ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
222 is_multicast_ether_addr(hdr->addr1) || !sta) {
223 sel->rate = rate_lowest(local, sband, sta);
224 rcu_read_unlock();
225 return;
226 }
227
228 /* If a forced rate is in effect, select it. */
229 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
230 if (sdata->bss && sdata->bss->force_unicast_rateidx > -1)
231 sta->txrate_idx = sdata->bss->force_unicast_rateidx;
232
233 rateidx = sta->txrate_idx;
234
235 if (rateidx >= sband->n_bitrates)
236 rateidx = sband->n_bitrates - 1;
237
238 sta->last_txrate_idx = rateidx;
239
240 rcu_read_unlock();
241
242 sel->rate = &sband->bitrates[rateidx];
243}
244
245
246static void rate_control_simple_rate_init(void *priv, void *priv_sta,
247 struct ieee80211_local *local,
248 struct sta_info *sta)
249{
250 struct ieee80211_supported_band *sband;
251
252 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
253
254 /* TODO: This routine should consider using RSSI from previous packets
255 * as we need to have IEEE 802.1X auth succeed immediately after assoc..
256 * Until that method is implemented, we will use the lowest supported rate
257 * as a workaround, */
258 sta->txrate_idx = rate_lowest_index(local, sband, sta);
259}
260
261
262static void * rate_control_simple_alloc(struct ieee80211_local *local)
263{
264 struct global_rate_control *rctrl;
265
266 rctrl = kzalloc(sizeof(*rctrl), GFP_ATOMIC);
267
268 return rctrl;
269}
270
271
272static void rate_control_simple_free(void *priv)
273{
274 struct global_rate_control *rctrl = priv;
275 kfree(rctrl);
276}
277
278
279static void rate_control_simple_clear(void *priv)
280{
281}
282
283
284static void * rate_control_simple_alloc_sta(void *priv, gfp_t gfp)
285{
286 struct sta_rate_control *rctrl;
287
288 rctrl = kzalloc(sizeof(*rctrl), gfp);
289
290 return rctrl;
291}
292
293
294static void rate_control_simple_free_sta(void *priv, void *priv_sta)
295{
296 struct sta_rate_control *rctrl = priv_sta;
297 kfree(rctrl);
298}
299
300#ifdef CONFIG_MAC80211_DEBUGFS
301
302static int open_file_generic(struct inode *inode, struct file *file)
303{
304 file->private_data = inode->i_private;
305 return 0;
306}
307
308static ssize_t sta_tx_avg_rate_sum_read(struct file *file,
309 char __user *userbuf,
310 size_t count, loff_t *ppos)
311{
312 struct sta_rate_control *srctrl = file->private_data;
313 char buf[20];
314
315 sprintf(buf, "%d\n", srctrl->tx_avg_rate_sum);
316 return simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
317}
318
319static const struct file_operations sta_tx_avg_rate_sum_ops = {
320 .read = sta_tx_avg_rate_sum_read,
321 .open = open_file_generic,
322};
323
324static ssize_t sta_tx_avg_rate_num_read(struct file *file,
325 char __user *userbuf,
326 size_t count, loff_t *ppos)
327{
328 struct sta_rate_control *srctrl = file->private_data;
329 char buf[20];
330
331 sprintf(buf, "%d\n", srctrl->tx_avg_rate_num);
332 return simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
333}
334
335static const struct file_operations sta_tx_avg_rate_num_ops = {
336 .read = sta_tx_avg_rate_num_read,
337 .open = open_file_generic,
338};
339
340static void rate_control_simple_add_sta_debugfs(void *priv, void *priv_sta,
341 struct dentry *dir)
342{
343 struct sta_rate_control *srctrl = priv_sta;
344
345 srctrl->tx_avg_rate_num_dentry =
346 debugfs_create_file("rc_simple_sta_tx_avg_rate_num", 0400,
347 dir, srctrl, &sta_tx_avg_rate_num_ops);
348 srctrl->tx_avg_rate_sum_dentry =
349 debugfs_create_file("rc_simple_sta_tx_avg_rate_sum", 0400,
350 dir, srctrl, &sta_tx_avg_rate_sum_ops);
351}
352
353static void rate_control_simple_remove_sta_debugfs(void *priv, void *priv_sta)
354{
355 struct sta_rate_control *srctrl = priv_sta;
356
357 debugfs_remove(srctrl->tx_avg_rate_sum_dentry);
358 debugfs_remove(srctrl->tx_avg_rate_num_dentry);
359}
360#endif
361
362static struct rate_control_ops mac80211_rcsimple = {
363 .name = "simple",
364 .tx_status = rate_control_simple_tx_status,
365 .get_rate = rate_control_simple_get_rate,
366 .rate_init = rate_control_simple_rate_init,
367 .clear = rate_control_simple_clear,
368 .alloc = rate_control_simple_alloc,
369 .free = rate_control_simple_free,
370 .alloc_sta = rate_control_simple_alloc_sta,
371 .free_sta = rate_control_simple_free_sta,
372#ifdef CONFIG_MAC80211_DEBUGFS
373 .add_sta_debugfs = rate_control_simple_add_sta_debugfs,
374 .remove_sta_debugfs = rate_control_simple_remove_sta_debugfs,
375#endif
376};
377
378MODULE_LICENSE("GPL");
379MODULE_DESCRIPTION("Simple rate control algorithm");
380
381int __init rc80211_simple_init(void)
382{
383 return ieee80211_rate_control_register(&mac80211_rcsimple);
384}
385
386void rc80211_simple_exit(void)
387{
388 ieee80211_rate_control_unregister(&mac80211_rcsimple);
389}
390
391#ifdef CONFIG_MAC80211_RC_SIMPLE_MODULE
392module_init(rc80211_simple_init);
393module_exit(rc80211_simple_exit);
394#endif
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