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b481de9c ZY |
1 | /****************************************************************************** |
2 | * | |
eb7ae89c | 3 | * Copyright(c) 2005 - 2008 Intel Corporation. All rights reserved. |
b481de9c ZY |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of version 2 of the GNU General Public License as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA | |
17 | * | |
18 | * The full GNU General Public License is included in this distribution in the | |
19 | * file called LICENSE. | |
20 | * | |
21 | * Contact Information: | |
759ef89f | 22 | * Intel Linux Wireless <ilw@linux.intel.com> |
b481de9c ZY |
23 | * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 |
24 | * | |
25 | *****************************************************************************/ | |
26 | ||
27 | #include <linux/kernel.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/skbuff.h> | |
30 | #include <linux/wireless.h> | |
31 | #include <net/mac80211.h> | |
b481de9c ZY |
32 | |
33 | #include <linux/netdevice.h> | |
34 | #include <linux/etherdevice.h> | |
35 | #include <linux/delay.h> | |
36 | ||
37 | #include <linux/workqueue.h> | |
38 | ||
5d08cd1d | 39 | #include "iwl-3945.h" |
b481de9c ZY |
40 | |
41 | #define RS_NAME "iwl-3945-rs" | |
42 | ||
bb8c093b | 43 | struct iwl3945_rate_scale_data { |
b481de9c ZY |
44 | u64 data; |
45 | s32 success_counter; | |
46 | s32 success_ratio; | |
47 | s32 counter; | |
48 | s32 average_tpt; | |
49 | unsigned long stamp; | |
50 | }; | |
51 | ||
fa254a68 | 52 | struct iwl3945_rs_sta { |
b481de9c ZY |
53 | spinlock_t lock; |
54 | s32 *expected_tpt; | |
55 | unsigned long last_partial_flush; | |
56 | unsigned long last_flush; | |
57 | u32 flush_time; | |
58 | u32 last_tx_packets; | |
59 | u32 tx_packets; | |
60 | u8 tgg; | |
61 | u8 flush_pending; | |
62 | u8 start_rate; | |
63 | u8 ibss_sta_added; | |
64 | struct timer_list rate_scale_flush; | |
bb8c093b | 65 | struct iwl3945_rate_scale_data win[IWL_RATE_COUNT]; |
c30e30e1 AM |
66 | #ifdef CONFIG_MAC80211_DEBUGFS |
67 | struct dentry *rs_sta_dbgfs_stats_table_file; | |
68 | #endif | |
b7e35008 JB |
69 | |
70 | /* used to be in sta_info */ | |
71 | int last_txrate_idx; | |
b481de9c ZY |
72 | }; |
73 | ||
bb8c093b | 74 | static s32 iwl3945_expected_tpt_g[IWL_RATE_COUNT] = { |
14577f23 | 75 | 7, 13, 35, 58, 0, 0, 76, 104, 130, 168, 191, 202 |
b481de9c ZY |
76 | }; |
77 | ||
bb8c093b | 78 | static s32 iwl3945_expected_tpt_g_prot[IWL_RATE_COUNT] = { |
14577f23 | 79 | 7, 13, 35, 58, 0, 0, 0, 80, 93, 113, 123, 125 |
b481de9c ZY |
80 | }; |
81 | ||
bb8c093b | 82 | static s32 iwl3945_expected_tpt_a[IWL_RATE_COUNT] = { |
14577f23 | 83 | 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186 |
b481de9c ZY |
84 | }; |
85 | ||
bb8c093b | 86 | static s32 iwl3945_expected_tpt_b[IWL_RATE_COUNT] = { |
14577f23 | 87 | 7, 13, 35, 58, 0, 0, 0, 0, 0, 0, 0, 0 |
b481de9c ZY |
88 | }; |
89 | ||
bb8c093b | 90 | struct iwl3945_tpt_entry { |
b481de9c ZY |
91 | s8 min_rssi; |
92 | u8 index; | |
93 | }; | |
94 | ||
bb8c093b | 95 | static struct iwl3945_tpt_entry iwl3945_tpt_table_a[] = { |
b481de9c ZY |
96 | {-60, IWL_RATE_54M_INDEX}, |
97 | {-64, IWL_RATE_48M_INDEX}, | |
98 | {-72, IWL_RATE_36M_INDEX}, | |
99 | {-80, IWL_RATE_24M_INDEX}, | |
100 | {-84, IWL_RATE_18M_INDEX}, | |
101 | {-85, IWL_RATE_12M_INDEX}, | |
102 | {-87, IWL_RATE_9M_INDEX}, | |
103 | {-89, IWL_RATE_6M_INDEX} | |
104 | }; | |
105 | ||
bb8c093b | 106 | static struct iwl3945_tpt_entry iwl3945_tpt_table_g[] = { |
b481de9c ZY |
107 | {-60, IWL_RATE_54M_INDEX}, |
108 | {-64, IWL_RATE_48M_INDEX}, | |
109 | {-68, IWL_RATE_36M_INDEX}, | |
110 | {-80, IWL_RATE_24M_INDEX}, | |
111 | {-84, IWL_RATE_18M_INDEX}, | |
112 | {-85, IWL_RATE_12M_INDEX}, | |
113 | {-86, IWL_RATE_11M_INDEX}, | |
114 | {-88, IWL_RATE_5M_INDEX}, | |
115 | {-90, IWL_RATE_2M_INDEX}, | |
116 | {-92, IWL_RATE_1M_INDEX} | |
117 | }; | |
118 | ||
119 | #define IWL_RATE_MAX_WINDOW 62 | |
74221d07 | 120 | #define IWL_RATE_FLUSH (3*HZ) |
b481de9c ZY |
121 | #define IWL_RATE_WIN_FLUSH (HZ/2) |
122 | #define IWL_RATE_HIGH_TH 11520 | |
74221d07 AM |
123 | #define IWL_SUCCESS_UP_TH 8960 |
124 | #define IWL_SUCCESS_DOWN_TH 10880 | |
b481de9c ZY |
125 | #define IWL_RATE_MIN_FAILURE_TH 8 |
126 | #define IWL_RATE_MIN_SUCCESS_TH 8 | |
127 | #define IWL_RATE_DECREASE_TH 1920 | |
128 | ||
8318d78a | 129 | static u8 iwl3945_get_rate_index_by_rssi(s32 rssi, enum ieee80211_band band) |
b481de9c ZY |
130 | { |
131 | u32 index = 0; | |
132 | u32 table_size = 0; | |
bb8c093b | 133 | struct iwl3945_tpt_entry *tpt_table = NULL; |
b481de9c ZY |
134 | |
135 | if ((rssi < IWL_MIN_RSSI_VAL) || (rssi > IWL_MAX_RSSI_VAL)) | |
136 | rssi = IWL_MIN_RSSI_VAL; | |
137 | ||
8318d78a JB |
138 | switch (band) { |
139 | case IEEE80211_BAND_2GHZ: | |
bb8c093b CH |
140 | tpt_table = iwl3945_tpt_table_g; |
141 | table_size = ARRAY_SIZE(iwl3945_tpt_table_g); | |
b481de9c ZY |
142 | break; |
143 | ||
8318d78a | 144 | case IEEE80211_BAND_5GHZ: |
bb8c093b CH |
145 | tpt_table = iwl3945_tpt_table_a; |
146 | table_size = ARRAY_SIZE(iwl3945_tpt_table_a); | |
b481de9c ZY |
147 | break; |
148 | ||
149 | default: | |
8318d78a | 150 | BUG(); |
b481de9c ZY |
151 | break; |
152 | } | |
153 | ||
154 | while ((index < table_size) && (rssi < tpt_table[index].min_rssi)) | |
155 | index++; | |
156 | ||
157 | index = min(index, (table_size - 1)); | |
158 | ||
159 | return tpt_table[index].index; | |
160 | } | |
161 | ||
bb8c093b | 162 | static void iwl3945_clear_window(struct iwl3945_rate_scale_data *window) |
b481de9c ZY |
163 | { |
164 | window->data = 0; | |
165 | window->success_counter = 0; | |
28447f3c | 166 | window->success_ratio = -1; |
b481de9c | 167 | window->counter = 0; |
28447f3c | 168 | window->average_tpt = IWL_INV_TPT; |
b481de9c ZY |
169 | window->stamp = 0; |
170 | } | |
171 | ||
172 | /** | |
bb8c093b | 173 | * iwl3945_rate_scale_flush_windows - flush out the rate scale windows |
b481de9c ZY |
174 | * |
175 | * Returns the number of windows that have gathered data but were | |
176 | * not flushed. If there were any that were not flushed, then | |
177 | * reschedule the rate flushing routine. | |
178 | */ | |
fa254a68 | 179 | static int iwl3945_rate_scale_flush_windows(struct iwl3945_rs_sta *rs_sta) |
b481de9c ZY |
180 | { |
181 | int unflushed = 0; | |
182 | int i; | |
183 | unsigned long flags; | |
184 | ||
185 | /* | |
186 | * For each rate, if we have collected data on that rate | |
187 | * and it has been more than IWL_RATE_WIN_FLUSH | |
188 | * since we flushed, clear out the gathered statistics | |
189 | */ | |
190 | for (i = 0; i < IWL_RATE_COUNT; i++) { | |
fa254a68 | 191 | if (!rs_sta->win[i].counter) |
b481de9c ZY |
192 | continue; |
193 | ||
fa254a68 TW |
194 | spin_lock_irqsave(&rs_sta->lock, flags); |
195 | if (time_after(jiffies, rs_sta->win[i].stamp + | |
b481de9c ZY |
196 | IWL_RATE_WIN_FLUSH)) { |
197 | IWL_DEBUG_RATE("flushing %d samples of rate " | |
198 | "index %d\n", | |
fa254a68 TW |
199 | rs_sta->win[i].counter, i); |
200 | iwl3945_clear_window(&rs_sta->win[i]); | |
b481de9c ZY |
201 | } else |
202 | unflushed++; | |
fa254a68 | 203 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c ZY |
204 | } |
205 | ||
206 | return unflushed; | |
207 | } | |
208 | ||
209 | #define IWL_RATE_FLUSH_MAX 5000 /* msec */ | |
210 | #define IWL_RATE_FLUSH_MIN 50 /* msec */ | |
74221d07 | 211 | #define IWL_AVERAGE_PACKETS 1500 |
b481de9c | 212 | |
bb8c093b | 213 | static void iwl3945_bg_rate_scale_flush(unsigned long data) |
b481de9c | 214 | { |
fa254a68 | 215 | struct iwl3945_rs_sta *rs_sta = (void *)data; |
b481de9c ZY |
216 | int unflushed = 0; |
217 | unsigned long flags; | |
218 | u32 packet_count, duration, pps; | |
219 | ||
220 | IWL_DEBUG_RATE("enter\n"); | |
221 | ||
fa254a68 | 222 | unflushed = iwl3945_rate_scale_flush_windows(rs_sta); |
b481de9c | 223 | |
fa254a68 | 224 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 225 | |
b481de9c | 226 | /* Number of packets Rx'd since last time this timer ran */ |
fa254a68 | 227 | packet_count = (rs_sta->tx_packets - rs_sta->last_tx_packets) + 1; |
b481de9c | 228 | |
fa254a68 | 229 | rs_sta->last_tx_packets = rs_sta->tx_packets + 1; |
b481de9c ZY |
230 | |
231 | if (unflushed) { | |
232 | duration = | |
fa254a68 | 233 | jiffies_to_msecs(jiffies - rs_sta->last_partial_flush); |
b481de9c ZY |
234 | |
235 | IWL_DEBUG_RATE("Tx'd %d packets in %dms\n", | |
236 | packet_count, duration); | |
237 | ||
238 | /* Determine packets per second */ | |
239 | if (duration) | |
240 | pps = (packet_count * 1000) / duration; | |
241 | else | |
242 | pps = 0; | |
243 | ||
244 | if (pps) { | |
74221d07 | 245 | duration = (IWL_AVERAGE_PACKETS * 1000) / pps; |
b481de9c ZY |
246 | if (duration < IWL_RATE_FLUSH_MIN) |
247 | duration = IWL_RATE_FLUSH_MIN; | |
74221d07 AM |
248 | else if (duration > IWL_RATE_FLUSH_MAX) |
249 | duration = IWL_RATE_FLUSH_MAX; | |
b481de9c ZY |
250 | } else |
251 | duration = IWL_RATE_FLUSH_MAX; | |
252 | ||
fa254a68 | 253 | rs_sta->flush_time = msecs_to_jiffies(duration); |
b481de9c ZY |
254 | |
255 | IWL_DEBUG_RATE("new flush period: %d msec ave %d\n", | |
256 | duration, packet_count); | |
257 | ||
fa254a68 TW |
258 | mod_timer(&rs_sta->rate_scale_flush, jiffies + |
259 | rs_sta->flush_time); | |
b481de9c | 260 | |
fa254a68 | 261 | rs_sta->last_partial_flush = jiffies; |
74221d07 AM |
262 | } else { |
263 | rs_sta->flush_time = IWL_RATE_FLUSH; | |
264 | rs_sta->flush_pending = 0; | |
b481de9c | 265 | } |
b481de9c ZY |
266 | /* If there weren't any unflushed entries, we don't schedule the timer |
267 | * to run again */ | |
268 | ||
fa254a68 | 269 | rs_sta->last_flush = jiffies; |
b481de9c | 270 | |
fa254a68 | 271 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c ZY |
272 | |
273 | IWL_DEBUG_RATE("leave\n"); | |
274 | } | |
275 | ||
276 | /** | |
bb8c093b | 277 | * iwl3945_collect_tx_data - Update the success/failure sliding window |
b481de9c ZY |
278 | * |
279 | * We keep a sliding window of the last 64 packets transmitted | |
280 | * at this rate. window->data contains the bitmask of successful | |
281 | * packets. | |
282 | */ | |
fa254a68 | 283 | static void iwl3945_collect_tx_data(struct iwl3945_rs_sta *rs_sta, |
bb8c093b | 284 | struct iwl3945_rate_scale_data *window, |
74221d07 | 285 | int success, int retries, int index) |
b481de9c ZY |
286 | { |
287 | unsigned long flags; | |
74221d07 | 288 | s32 fail_count; |
b481de9c ZY |
289 | |
290 | if (!retries) { | |
291 | IWL_DEBUG_RATE("leave: retries == 0 -- should be at least 1\n"); | |
292 | return; | |
293 | } | |
294 | ||
74221d07 | 295 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 296 | while (retries--) { |
b481de9c ZY |
297 | |
298 | /* If we have filled up the window then subtract one from the | |
299 | * success counter if the high-bit is counting toward | |
300 | * success */ | |
301 | if (window->counter == IWL_RATE_MAX_WINDOW) { | |
302 | if (window->data & (1ULL << (IWL_RATE_MAX_WINDOW - 1))) | |
303 | window->success_counter--; | |
304 | } else | |
305 | window->counter++; | |
306 | ||
307 | /* Slide the window to the left one bit */ | |
308 | window->data = (window->data << 1); | |
309 | ||
310 | /* If this packet was a success then set the low bit high */ | |
311 | if (success) { | |
312 | window->success_counter++; | |
313 | window->data |= 1; | |
314 | } | |
315 | ||
316 | /* window->counter can't be 0 -- it is either >0 or | |
317 | * IWL_RATE_MAX_WINDOW */ | |
318 | window->success_ratio = 12800 * window->success_counter / | |
319 | window->counter; | |
320 | ||
321 | /* Tag this window as having been updated */ | |
322 | window->stamp = jiffies; | |
323 | ||
b481de9c | 324 | } |
74221d07 AM |
325 | |
326 | fail_count = window->counter - window->success_counter; | |
327 | if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) || | |
328 | (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH)) | |
329 | window->average_tpt = ((window->success_ratio * | |
330 | rs_sta->expected_tpt[index] + 64) / 128); | |
331 | else | |
332 | window->average_tpt = IWL_INV_TPT; | |
333 | ||
334 | spin_unlock_irqrestore(&rs_sta->lock, flags); | |
335 | ||
b481de9c ZY |
336 | } |
337 | ||
7262796a | 338 | static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband, |
4b7679a5 | 339 | struct ieee80211_sta *sta, void *priv_sta) |
b481de9c | 340 | { |
4b7679a5 | 341 | struct iwl3945_rs_sta *rs_sta = priv_sta; |
7262796a | 342 | struct iwl3945_priv *priv = (struct iwl3945_priv *)priv_r; |
b481de9c ZY |
343 | int i; |
344 | ||
345 | IWL_DEBUG_RATE("enter\n"); | |
346 | ||
347 | /* TODO: what is a good starting rate for STA? About middle? Maybe not | |
348 | * the lowest or the highest rate.. Could consider using RSSI from | |
349 | * previous packets? Need to have IEEE 802.1X auth succeed immediately | |
350 | * after assoc.. */ | |
351 | ||
7262796a | 352 | for (i = sband->n_bitrates - 1; i >= 0; i--) { |
4b7679a5 | 353 | if (sta->supp_rates[sband->band] & (1 << i)) { |
ae17e986 | 354 | rs_sta->last_txrate_idx = i; |
b481de9c ZY |
355 | break; |
356 | } | |
357 | } | |
358 | ||
7262796a | 359 | priv->sta_supp_rates = sta->supp_rates[sband->band]; |
8318d78a | 360 | /* For 5 GHz band it start at IWL_FIRST_OFDM_RATE */ |
7262796a | 361 | if (sband->band == IEEE80211_BAND_5GHZ) { |
b7e35008 | 362 | rs_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE; |
7262796a AM |
363 | priv->sta_supp_rates = priv->sta_supp_rates << |
364 | IWL_FIRST_OFDM_RATE; | |
365 | } | |
366 | ||
14577f23 | 367 | |
b481de9c ZY |
368 | IWL_DEBUG_RATE("leave\n"); |
369 | } | |
370 | ||
4b7679a5 | 371 | static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) |
b481de9c | 372 | { |
4b7679a5 | 373 | return hw->priv; |
b481de9c ZY |
374 | } |
375 | ||
01ebd063 | 376 | /* rate scale requires free function to be implemented */ |
b481de9c ZY |
377 | static void rs_free(void *priv) |
378 | { | |
379 | return; | |
380 | } | |
4b7679a5 | 381 | |
4b7679a5 | 382 | static void *rs_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp) |
b481de9c | 383 | { |
fa254a68 | 384 | struct iwl3945_rs_sta *rs_sta; |
4b7679a5 | 385 | struct iwl3945_sta_priv *psta = (void *) sta->drv_priv; |
b481de9c ZY |
386 | int i; |
387 | ||
4b7679a5 JB |
388 | /* |
389 | * XXX: If it's using sta->drv_priv anyway, it might | |
390 | * as well just put all the information there. | |
391 | */ | |
392 | ||
b481de9c ZY |
393 | IWL_DEBUG_RATE("enter\n"); |
394 | ||
fa254a68 TW |
395 | rs_sta = kzalloc(sizeof(struct iwl3945_rs_sta), gfp); |
396 | if (!rs_sta) { | |
b481de9c ZY |
397 | IWL_DEBUG_RATE("leave: ENOMEM\n"); |
398 | return NULL; | |
399 | } | |
400 | ||
4b7679a5 JB |
401 | psta->rs_sta = rs_sta; |
402 | ||
fa254a68 | 403 | spin_lock_init(&rs_sta->lock); |
b481de9c | 404 | |
fa254a68 | 405 | rs_sta->start_rate = IWL_RATE_INVALID; |
b481de9c ZY |
406 | |
407 | /* default to just 802.11b */ | |
fa254a68 | 408 | rs_sta->expected_tpt = iwl3945_expected_tpt_b; |
b481de9c | 409 | |
fa254a68 TW |
410 | rs_sta->last_partial_flush = jiffies; |
411 | rs_sta->last_flush = jiffies; | |
412 | rs_sta->flush_time = IWL_RATE_FLUSH; | |
413 | rs_sta->last_tx_packets = 0; | |
414 | rs_sta->ibss_sta_added = 0; | |
b481de9c | 415 | |
fa254a68 TW |
416 | init_timer(&rs_sta->rate_scale_flush); |
417 | rs_sta->rate_scale_flush.data = (unsigned long)rs_sta; | |
418 | rs_sta->rate_scale_flush.function = &iwl3945_bg_rate_scale_flush; | |
b481de9c ZY |
419 | |
420 | for (i = 0; i < IWL_RATE_COUNT; i++) | |
fa254a68 | 421 | iwl3945_clear_window(&rs_sta->win[i]); |
b481de9c ZY |
422 | |
423 | IWL_DEBUG_RATE("leave\n"); | |
424 | ||
fa254a68 | 425 | return rs_sta; |
b481de9c ZY |
426 | } |
427 | ||
4b7679a5 JB |
428 | static void rs_free_sta(void *priv, struct ieee80211_sta *sta, |
429 | void *priv_sta) | |
b481de9c | 430 | { |
4b7679a5 | 431 | struct iwl3945_sta_priv *psta = (void *) sta->drv_priv; |
fa254a68 | 432 | struct iwl3945_rs_sta *rs_sta = priv_sta; |
b481de9c | 433 | |
4b7679a5 JB |
434 | psta->rs_sta = NULL; |
435 | ||
b481de9c | 436 | IWL_DEBUG_RATE("enter\n"); |
fa254a68 TW |
437 | del_timer_sync(&rs_sta->rate_scale_flush); |
438 | kfree(rs_sta); | |
b481de9c ZY |
439 | IWL_DEBUG_RATE("leave\n"); |
440 | } | |
441 | ||
14577f23 | 442 | |
b481de9c ZY |
443 | /** |
444 | * rs_tx_status - Update rate control values based on Tx results | |
445 | * | |
bb8c093b | 446 | * NOTE: Uses iwl3945_priv->retry_rate for the # of retries attempted by |
b481de9c ZY |
447 | * the hardware for each rate. |
448 | */ | |
4b7679a5 JB |
449 | static void rs_tx_status(void *priv_rate, struct ieee80211_supported_band *sband, |
450 | struct ieee80211_sta *sta, void *priv_sta, | |
e039fa4a | 451 | struct sk_buff *skb) |
b481de9c | 452 | { |
74221d07 | 453 | s8 retries = 0, current_count; |
b481de9c ZY |
454 | int scale_rate_index, first_index, last_index; |
455 | unsigned long flags; | |
bb8c093b | 456 | struct iwl3945_priv *priv = (struct iwl3945_priv *)priv_rate; |
4b7679a5 | 457 | struct iwl3945_rs_sta *rs_sta = priv_sta; |
e039fa4a | 458 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
8318d78a | 459 | |
28447f3c TW |
460 | IWL_DEBUG_RATE("enter\n"); |
461 | ||
74221d07 | 462 | retries = info->status.rates[0].count; |
e6a9854b JB |
463 | |
464 | first_index = sband->bitrates[info->status.rates[0].idx].hw_value; | |
b481de9c | 465 | if ((first_index < 0) || (first_index >= IWL_RATE_COUNT)) { |
8318d78a | 466 | IWL_DEBUG_RATE("leave: Rate out of bounds: %d\n", first_index); |
b481de9c ZY |
467 | return; |
468 | } | |
469 | ||
4b7679a5 | 470 | if (!priv_sta) { |
b481de9c ZY |
471 | IWL_DEBUG_RATE("leave: No STA priv data to update!\n"); |
472 | return; | |
473 | } | |
474 | ||
fa254a68 | 475 | rs_sta->tx_packets++; |
b481de9c ZY |
476 | |
477 | scale_rate_index = first_index; | |
478 | last_index = first_index; | |
479 | ||
480 | /* | |
481 | * Update the window for each rate. We determine which rates | |
482 | * were Tx'd based on the total number of retries vs. the number | |
483 | * of retries configured for each rate -- currently set to the | |
484 | * priv value 'retry_rate' vs. rate specific | |
485 | * | |
486 | * On exit from this while loop last_index indicates the rate | |
487 | * at which the frame was finally transmitted (or failed if no | |
488 | * ACK) | |
489 | */ | |
74221d07 AM |
490 | while (retries > 1) { |
491 | if ((retries - 1) < priv->retry_rate) { | |
492 | current_count = (retries - 1); | |
b481de9c ZY |
493 | last_index = scale_rate_index; |
494 | } else { | |
495 | current_count = priv->retry_rate; | |
e6a9854b | 496 | last_index = iwl3945_rs_next_rate(priv, |
14577f23 | 497 | scale_rate_index); |
b481de9c ZY |
498 | } |
499 | ||
500 | /* Update this rate accounting for as many retries | |
501 | * as was used for it (per current_count) */ | |
fa254a68 TW |
502 | iwl3945_collect_tx_data(rs_sta, |
503 | &rs_sta->win[scale_rate_index], | |
74221d07 | 504 | 0, current_count, scale_rate_index); |
b481de9c ZY |
505 | IWL_DEBUG_RATE("Update rate %d for %d retries.\n", |
506 | scale_rate_index, current_count); | |
507 | ||
508 | retries -= current_count; | |
509 | ||
74221d07 | 510 | scale_rate_index = last_index; |
b481de9c ZY |
511 | } |
512 | ||
14577f23 | 513 | |
b481de9c ZY |
514 | /* Update the last index window with success/failure based on ACK */ |
515 | IWL_DEBUG_RATE("Update rate %d with %s.\n", | |
516 | last_index, | |
e039fa4a | 517 | (info->flags & IEEE80211_TX_STAT_ACK) ? |
b481de9c | 518 | "success" : "failure"); |
fa254a68 TW |
519 | iwl3945_collect_tx_data(rs_sta, |
520 | &rs_sta->win[last_index], | |
74221d07 | 521 | info->flags & IEEE80211_TX_STAT_ACK, 1, last_index); |
b481de9c ZY |
522 | |
523 | /* We updated the rate scale window -- if its been more than | |
524 | * flush_time since the last run, schedule the flush | |
525 | * again */ | |
fa254a68 | 526 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 527 | |
fa254a68 | 528 | if (!rs_sta->flush_pending && |
74221d07 | 529 | time_after(jiffies, rs_sta->last_flush + |
fa254a68 | 530 | rs_sta->flush_time)) { |
b481de9c | 531 | |
74221d07 | 532 | rs_sta->last_partial_flush = jiffies; |
fa254a68 TW |
533 | rs_sta->flush_pending = 1; |
534 | mod_timer(&rs_sta->rate_scale_flush, | |
535 | jiffies + rs_sta->flush_time); | |
b481de9c ZY |
536 | } |
537 | ||
fa254a68 | 538 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c | 539 | |
b481de9c ZY |
540 | IWL_DEBUG_RATE("leave\n"); |
541 | ||
542 | return; | |
543 | } | |
544 | ||
fa254a68 | 545 | static u16 iwl3945_get_adjacent_rate(struct iwl3945_rs_sta *rs_sta, |
8318d78a | 546 | u8 index, u16 rate_mask, enum ieee80211_band band) |
b481de9c ZY |
547 | { |
548 | u8 high = IWL_RATE_INVALID; | |
549 | u8 low = IWL_RATE_INVALID; | |
550 | ||
01ebd063 | 551 | /* 802.11A walks to the next literal adjacent rate in |
b481de9c | 552 | * the rate table */ |
8318d78a | 553 | if (unlikely(band == IEEE80211_BAND_5GHZ)) { |
b481de9c ZY |
554 | int i; |
555 | u32 mask; | |
556 | ||
557 | /* Find the previous rate that is in the rate mask */ | |
558 | i = index - 1; | |
559 | for (mask = (1 << i); i >= 0; i--, mask >>= 1) { | |
560 | if (rate_mask & mask) { | |
561 | low = i; | |
562 | break; | |
563 | } | |
564 | } | |
565 | ||
566 | /* Find the next rate that is in the rate mask */ | |
567 | i = index + 1; | |
568 | for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { | |
569 | if (rate_mask & mask) { | |
570 | high = i; | |
571 | break; | |
572 | } | |
573 | } | |
574 | ||
575 | return (high << 8) | low; | |
576 | } | |
577 | ||
578 | low = index; | |
579 | while (low != IWL_RATE_INVALID) { | |
fa254a68 | 580 | if (rs_sta->tgg) |
bb8c093b | 581 | low = iwl3945_rates[low].prev_rs_tgg; |
b481de9c | 582 | else |
bb8c093b | 583 | low = iwl3945_rates[low].prev_rs; |
b481de9c ZY |
584 | if (low == IWL_RATE_INVALID) |
585 | break; | |
586 | if (rate_mask & (1 << low)) | |
587 | break; | |
588 | IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low); | |
589 | } | |
590 | ||
591 | high = index; | |
592 | while (high != IWL_RATE_INVALID) { | |
fa254a68 | 593 | if (rs_sta->tgg) |
bb8c093b | 594 | high = iwl3945_rates[high].next_rs_tgg; |
b481de9c | 595 | else |
bb8c093b | 596 | high = iwl3945_rates[high].next_rs; |
b481de9c ZY |
597 | if (high == IWL_RATE_INVALID) |
598 | break; | |
599 | if (rate_mask & (1 << high)) | |
600 | break; | |
601 | IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high); | |
602 | } | |
603 | ||
604 | return (high << 8) | low; | |
605 | } | |
606 | ||
607 | /** | |
608 | * rs_get_rate - find the rate for the requested packet | |
609 | * | |
610 | * Returns the ieee80211_rate structure allocated by the driver. | |
611 | * | |
612 | * The rate control algorithm has no internal mapping between hw_mode's | |
613 | * rate ordering and the rate ordering used by the rate control algorithm. | |
614 | * | |
615 | * The rate control algorithm uses a single table of rates that goes across | |
616 | * the entire A/B/G spectrum vs. being limited to just one particular | |
617 | * hw_mode. | |
618 | * | |
619 | * As such, we can't convert the index obtained below into the hw_mode's | |
620 | * rate table and must reference the driver allocated rate table | |
621 | * | |
622 | */ | |
e6a9854b JB |
623 | static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, |
624 | void *priv_sta, struct ieee80211_tx_rate_control *txrc) | |
b481de9c | 625 | { |
e6a9854b JB |
626 | struct ieee80211_supported_band *sband = txrc->sband; |
627 | struct sk_buff *skb = txrc->skb; | |
b481de9c ZY |
628 | u8 low = IWL_RATE_INVALID; |
629 | u8 high = IWL_RATE_INVALID; | |
630 | u16 high_low; | |
631 | int index; | |
4b7679a5 | 632 | struct iwl3945_rs_sta *rs_sta = priv_sta; |
bb8c093b | 633 | struct iwl3945_rate_scale_data *window = NULL; |
28447f3c TW |
634 | int current_tpt = IWL_INV_TPT; |
635 | int low_tpt = IWL_INV_TPT; | |
636 | int high_tpt = IWL_INV_TPT; | |
b481de9c ZY |
637 | u32 fail_count; |
638 | s8 scale_action = 0; | |
639 | unsigned long flags; | |
b481de9c | 640 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
c338ba3c AM |
641 | u16 fc; |
642 | u16 rate_mask = 0; | |
4b7679a5 | 643 | struct iwl3945_priv *priv = (struct iwl3945_priv *)priv_r; |
e6a9854b | 644 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
b481de9c ZY |
645 | |
646 | IWL_DEBUG_RATE("enter\n"); | |
647 | ||
c338ba3c AM |
648 | if (sta) |
649 | rate_mask = sta->supp_rates[sband->band]; | |
650 | ||
2bc454b0 MW |
651 | /* Send management frames and broadcast/multicast data using lowest |
652 | * rate. */ | |
653 | fc = le16_to_cpu(hdr->frame_control); | |
654 | if ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA || | |
655 | is_multicast_ether_addr(hdr->addr1) || | |
4b7679a5 | 656 | !sta || !priv_sta) { |
b481de9c | 657 | IWL_DEBUG_RATE("leave: No STA priv data to update!\n"); |
c338ba3c AM |
658 | if (!rate_mask) |
659 | info->control.rates[0].idx = | |
660 | rate_lowest_index(sband, NULL); | |
661 | else | |
662 | info->control.rates[0].idx = | |
663 | rate_lowest_index(sband, sta); | |
1abbe498 | 664 | return; |
b481de9c ZY |
665 | } |
666 | ||
b7e35008 | 667 | index = min(rs_sta->last_txrate_idx & 0xffff, IWL_RATE_COUNT - 1); |
14577f23 | 668 | |
28447f3c | 669 | if (sband->band == IEEE80211_BAND_5GHZ) |
14577f23 | 670 | rate_mask = rate_mask << IWL_FIRST_OFDM_RATE; |
b481de9c | 671 | |
05c914fe | 672 | if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) && |
fa254a68 | 673 | !rs_sta->ibss_sta_added) { |
bb8c093b | 674 | u8 sta_id = iwl3945_hw_find_station(priv, hdr->addr1); |
b481de9c ZY |
675 | |
676 | if (sta_id == IWL_INVALID_STATION) { | |
e174961c JB |
677 | IWL_DEBUG_RATE("LQ: ADD station %pm\n", |
678 | hdr->addr1); | |
bb8c093b | 679 | sta_id = iwl3945_add_station(priv, |
b481de9c ZY |
680 | hdr->addr1, 0, CMD_ASYNC); |
681 | } | |
682 | if (sta_id != IWL_INVALID_STATION) | |
fa254a68 | 683 | rs_sta->ibss_sta_added = 1; |
b481de9c ZY |
684 | } |
685 | ||
fa254a68 | 686 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 687 | |
74221d07 AM |
688 | /* for recent assoc, choose best rate regarding |
689 | * to rssi value | |
690 | */ | |
fa254a68 | 691 | if (rs_sta->start_rate != IWL_RATE_INVALID) { |
74221d07 AM |
692 | if (rs_sta->start_rate < index && |
693 | (rate_mask & (1 << rs_sta->start_rate))) | |
694 | index = rs_sta->start_rate; | |
fa254a68 | 695 | rs_sta->start_rate = IWL_RATE_INVALID; |
b481de9c ZY |
696 | } |
697 | ||
fa254a68 | 698 | window = &(rs_sta->win[index]); |
b481de9c ZY |
699 | |
700 | fail_count = window->counter - window->success_counter; | |
701 | ||
702 | if (((fail_count <= IWL_RATE_MIN_FAILURE_TH) && | |
703 | (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))) { | |
fa254a68 | 704 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c ZY |
705 | |
706 | IWL_DEBUG_RATE("Invalid average_tpt on rate %d: " | |
707 | "counter: %d, success_counter: %d, " | |
708 | "expected_tpt is %sNULL\n", | |
709 | index, | |
710 | window->counter, | |
711 | window->success_counter, | |
fa254a68 | 712 | rs_sta->expected_tpt ? "not " : ""); |
b481de9c ZY |
713 | goto out; |
714 | ||
715 | } | |
716 | ||
b481de9c ZY |
717 | current_tpt = window->average_tpt; |
718 | ||
fa254a68 | 719 | high_low = iwl3945_get_adjacent_rate(rs_sta, index, rate_mask, |
28447f3c | 720 | sband->band); |
b481de9c ZY |
721 | low = high_low & 0xff; |
722 | high = (high_low >> 8) & 0xff; | |
723 | ||
724 | if (low != IWL_RATE_INVALID) | |
fa254a68 | 725 | low_tpt = rs_sta->win[low].average_tpt; |
b481de9c ZY |
726 | |
727 | if (high != IWL_RATE_INVALID) | |
fa254a68 | 728 | high_tpt = rs_sta->win[high].average_tpt; |
b481de9c | 729 | |
fa254a68 | 730 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c ZY |
731 | |
732 | scale_action = 1; | |
733 | ||
734 | if ((window->success_ratio < IWL_RATE_DECREASE_TH) || !current_tpt) { | |
735 | IWL_DEBUG_RATE("decrease rate because of low success_ratio\n"); | |
736 | scale_action = -1; | |
28447f3c | 737 | } else if ((low_tpt == IWL_INV_TPT) && (high_tpt == IWL_INV_TPT)) |
b481de9c | 738 | scale_action = 1; |
28447f3c TW |
739 | else if ((low_tpt != IWL_INV_TPT) && (high_tpt != IWL_INV_TPT) && |
740 | (low_tpt < current_tpt) && (high_tpt < current_tpt)) { | |
b481de9c ZY |
741 | IWL_DEBUG_RATE("No action -- low [%d] & high [%d] < " |
742 | "current_tpt [%d]\n", | |
743 | low_tpt, high_tpt, current_tpt); | |
744 | scale_action = 0; | |
745 | } else { | |
28447f3c | 746 | if (high_tpt != IWL_INV_TPT) { |
b481de9c ZY |
747 | if (high_tpt > current_tpt) |
748 | scale_action = 1; | |
749 | else { | |
750 | IWL_DEBUG_RATE | |
751 | ("decrease rate because of high tpt\n"); | |
752 | scale_action = -1; | |
753 | } | |
28447f3c | 754 | } else if (low_tpt != IWL_INV_TPT) { |
b481de9c ZY |
755 | if (low_tpt > current_tpt) { |
756 | IWL_DEBUG_RATE | |
757 | ("decrease rate because of low tpt\n"); | |
758 | scale_action = -1; | |
759 | } else | |
760 | scale_action = 1; | |
761 | } | |
762 | } | |
763 | ||
74221d07 AM |
764 | if (scale_action == -1) { |
765 | if (window->success_ratio > IWL_SUCCESS_DOWN_TH) | |
766 | scale_action = 0; | |
767 | } else if (scale_action == 1) { | |
768 | if (window->success_ratio < IWL_SUCCESS_UP_TH) { | |
769 | IWL_DEBUG_RATE("No action -- success_ratio [%d] < " | |
770 | "SUCCESS UP\n", window->success_ratio); | |
771 | scale_action = 0; | |
772 | } | |
b481de9c ZY |
773 | } |
774 | ||
775 | switch (scale_action) { | |
776 | case -1: | |
777 | if (low != IWL_RATE_INVALID) | |
778 | index = low; | |
779 | break; | |
780 | ||
781 | case 1: | |
782 | if (high != IWL_RATE_INVALID) | |
783 | index = high; | |
784 | ||
785 | break; | |
786 | ||
787 | case 0: | |
788 | default: | |
789 | break; | |
790 | } | |
791 | ||
792 | IWL_DEBUG_RATE("Selected %d (action %d) - low %d high %d\n", | |
793 | index, scale_action, low, high); | |
794 | ||
795 | out: | |
796 | ||
b7e35008 | 797 | rs_sta->last_txrate_idx = index; |
28447f3c | 798 | if (sband->band == IEEE80211_BAND_5GHZ) |
e6a9854b JB |
799 | info->control.rates[0].idx = rs_sta->last_txrate_idx - |
800 | IWL_FIRST_OFDM_RATE; | |
14577f23 | 801 | else |
e6a9854b | 802 | info->control.rates[0].idx = rs_sta->last_txrate_idx; |
14577f23 | 803 | |
b481de9c | 804 | IWL_DEBUG_RATE("leave: %d\n", index); |
b481de9c ZY |
805 | } |
806 | ||
c30e30e1 AM |
807 | #ifdef CONFIG_MAC80211_DEBUGFS |
808 | static int iwl3945_open_file_generic(struct inode *inode, struct file *file) | |
809 | { | |
810 | file->private_data = inode->i_private; | |
811 | return 0; | |
812 | } | |
813 | ||
814 | static ssize_t iwl3945_sta_dbgfs_stats_table_read(struct file *file, | |
815 | char __user *user_buf, | |
816 | size_t count, loff_t *ppos) | |
817 | { | |
818 | char buff[1024]; | |
819 | int desc = 0; | |
820 | int j; | |
821 | struct iwl3945_rs_sta *lq_sta = file->private_data; | |
822 | ||
823 | desc += sprintf(buff + desc, "tx packets=%d last rate index=%d\n" | |
824 | "rate=0x%X flush time %d\n", | |
825 | lq_sta->tx_packets, | |
826 | lq_sta->last_txrate_idx, | |
827 | lq_sta->start_rate, jiffies_to_msecs(lq_sta->flush_time)); | |
828 | for (j = 0; j < IWL_RATE_COUNT; j++) { | |
829 | desc += sprintf(buff+desc, | |
830 | "counter=%d success=%d %%=%d\n", | |
831 | lq_sta->win[j].counter, | |
832 | lq_sta->win[j].success_counter, | |
833 | lq_sta->win[j].success_ratio); | |
834 | } | |
835 | return simple_read_from_buffer(user_buf, count, ppos, buff, desc); | |
836 | } | |
837 | ||
838 | static const struct file_operations rs_sta_dbgfs_stats_table_ops = { | |
839 | .read = iwl3945_sta_dbgfs_stats_table_read, | |
840 | .open = iwl3945_open_file_generic, | |
841 | }; | |
842 | ||
843 | static void iwl3945_add_debugfs(void *priv, void *priv_sta, | |
844 | struct dentry *dir) | |
845 | { | |
846 | struct iwl3945_rs_sta *lq_sta = priv_sta; | |
847 | ||
848 | lq_sta->rs_sta_dbgfs_stats_table_file = | |
849 | debugfs_create_file("rate_stats_table", 0600, dir, | |
850 | lq_sta, &rs_sta_dbgfs_stats_table_ops); | |
851 | ||
852 | } | |
853 | ||
854 | static void iwl3945_remove_debugfs(void *priv, void *priv_sta) | |
855 | { | |
856 | struct iwl3945_rs_sta *lq_sta = priv_sta; | |
857 | debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file); | |
858 | } | |
859 | #endif | |
860 | ||
b481de9c ZY |
861 | static struct rate_control_ops rs_ops = { |
862 | .module = NULL, | |
863 | .name = RS_NAME, | |
864 | .tx_status = rs_tx_status, | |
865 | .get_rate = rs_get_rate, | |
866 | .rate_init = rs_rate_init, | |
b481de9c ZY |
867 | .alloc = rs_alloc, |
868 | .free = rs_free, | |
869 | .alloc_sta = rs_alloc_sta, | |
870 | .free_sta = rs_free_sta, | |
c30e30e1 AM |
871 | #ifdef CONFIG_MAC80211_DEBUGFS |
872 | .add_sta_debugfs = iwl3945_add_debugfs, | |
873 | .remove_sta_debugfs = iwl3945_remove_debugfs, | |
874 | #endif | |
875 | ||
b481de9c ZY |
876 | }; |
877 | ||
bb8c093b | 878 | void iwl3945_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id) |
b481de9c | 879 | { |
bb8c093b | 880 | struct iwl3945_priv *priv = hw->priv; |
b481de9c ZY |
881 | s32 rssi = 0; |
882 | unsigned long flags; | |
fa254a68 | 883 | struct iwl3945_rs_sta *rs_sta; |
4b7679a5 JB |
884 | struct ieee80211_sta *sta; |
885 | struct iwl3945_sta_priv *psta; | |
b481de9c ZY |
886 | |
887 | IWL_DEBUG_RATE("enter\n"); | |
888 | ||
d0709a65 JB |
889 | rcu_read_lock(); |
890 | ||
4b7679a5 | 891 | sta = ieee80211_find_sta(hw, priv->stations[sta_id].sta.sta.addr); |
52518189 | 892 | if (!sta) { |
d0709a65 | 893 | rcu_read_unlock(); |
b481de9c ZY |
894 | return; |
895 | } | |
896 | ||
52518189 | 897 | psta = (void *) sta->drv_priv; |
4b7679a5 | 898 | rs_sta = psta->rs_sta; |
b481de9c | 899 | |
fa254a68 | 900 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 901 | |
fa254a68 | 902 | rs_sta->tgg = 0; |
8318d78a JB |
903 | switch (priv->band) { |
904 | case IEEE80211_BAND_2GHZ: | |
905 | /* TODO: this always does G, not a regression */ | |
b481de9c | 906 | if (priv->active_rxon.flags & RXON_FLG_TGG_PROTECT_MSK) { |
fa254a68 TW |
907 | rs_sta->tgg = 1; |
908 | rs_sta->expected_tpt = iwl3945_expected_tpt_g_prot; | |
b481de9c | 909 | } else |
fa254a68 | 910 | rs_sta->expected_tpt = iwl3945_expected_tpt_g; |
b481de9c ZY |
911 | break; |
912 | ||
8318d78a | 913 | case IEEE80211_BAND_5GHZ: |
fa254a68 | 914 | rs_sta->expected_tpt = iwl3945_expected_tpt_a; |
b481de9c | 915 | break; |
8318d78a JB |
916 | case IEEE80211_NUM_BANDS: |
917 | BUG(); | |
b481de9c ZY |
918 | break; |
919 | } | |
920 | ||
fa254a68 | 921 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c ZY |
922 | |
923 | rssi = priv->last_rx_rssi; | |
924 | if (rssi == 0) | |
925 | rssi = IWL_MIN_RSSI_VAL; | |
926 | ||
927 | IWL_DEBUG(IWL_DL_INFO | IWL_DL_RATE, "Network RSSI: %d\n", rssi); | |
928 | ||
8318d78a | 929 | rs_sta->start_rate = iwl3945_get_rate_index_by_rssi(rssi, priv->band); |
b481de9c ZY |
930 | |
931 | IWL_DEBUG_RATE("leave: rssi %d assign rate index: " | |
fa254a68 TW |
932 | "%d (plcp 0x%x)\n", rssi, rs_sta->start_rate, |
933 | iwl3945_rates[rs_sta->start_rate].plcp); | |
52518189 | 934 | rcu_read_unlock(); |
b481de9c ZY |
935 | } |
936 | ||
897e1cf2 | 937 | int iwl3945_rate_control_register(void) |
b481de9c | 938 | { |
897e1cf2 | 939 | return ieee80211_rate_control_register(&rs_ops); |
b481de9c ZY |
940 | } |
941 | ||
897e1cf2 | 942 | void iwl3945_rate_control_unregister(void) |
b481de9c ZY |
943 | { |
944 | ieee80211_rate_control_unregister(&rs_ops); | |
945 | } | |
946 | ||
947 |