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b481de9c ZY |
1 | /****************************************************************************** |
2 | * | |
01f8162a | 3 | * Copyright(c) 2005 - 2009 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 | ||
600c0e11 | 39 | #include "iwl-commands.h" |
5d08cd1d | 40 | #include "iwl-3945.h" |
b481de9c ZY |
41 | |
42 | #define RS_NAME "iwl-3945-rs" | |
43 | ||
bb8c093b | 44 | struct iwl3945_rate_scale_data { |
b481de9c ZY |
45 | u64 data; |
46 | s32 success_counter; | |
47 | s32 success_ratio; | |
48 | s32 counter; | |
49 | s32 average_tpt; | |
50 | unsigned long stamp; | |
51 | }; | |
52 | ||
fa254a68 | 53 | struct iwl3945_rs_sta { |
b481de9c | 54 | spinlock_t lock; |
4a8a4322 | 55 | struct iwl_priv *priv; |
b481de9c ZY |
56 | s32 *expected_tpt; |
57 | unsigned long last_partial_flush; | |
58 | unsigned long last_flush; | |
59 | u32 flush_time; | |
60 | u32 last_tx_packets; | |
61 | u32 tx_packets; | |
62 | u8 tgg; | |
63 | u8 flush_pending; | |
64 | u8 start_rate; | |
65 | u8 ibss_sta_added; | |
66 | struct timer_list rate_scale_flush; | |
d9829a67 | 67 | struct iwl3945_rate_scale_data win[IWL_RATE_COUNT_3945]; |
c30e30e1 AM |
68 | #ifdef CONFIG_MAC80211_DEBUGFS |
69 | struct dentry *rs_sta_dbgfs_stats_table_file; | |
70 | #endif | |
b7e35008 JB |
71 | |
72 | /* used to be in sta_info */ | |
73 | int last_txrate_idx; | |
b481de9c ZY |
74 | }; |
75 | ||
d9829a67 | 76 | static s32 iwl3945_expected_tpt_g[IWL_RATE_COUNT_3945] = { |
14577f23 | 77 | 7, 13, 35, 58, 0, 0, 76, 104, 130, 168, 191, 202 |
b481de9c ZY |
78 | }; |
79 | ||
d9829a67 | 80 | static s32 iwl3945_expected_tpt_g_prot[IWL_RATE_COUNT_3945] = { |
14577f23 | 81 | 7, 13, 35, 58, 0, 0, 0, 80, 93, 113, 123, 125 |
b481de9c ZY |
82 | }; |
83 | ||
d9829a67 | 84 | static s32 iwl3945_expected_tpt_a[IWL_RATE_COUNT_3945] = { |
14577f23 | 85 | 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186 |
b481de9c ZY |
86 | }; |
87 | ||
d9829a67 | 88 | static s32 iwl3945_expected_tpt_b[IWL_RATE_COUNT_3945] = { |
14577f23 | 89 | 7, 13, 35, 58, 0, 0, 0, 0, 0, 0, 0, 0 |
b481de9c ZY |
90 | }; |
91 | ||
bb8c093b | 92 | struct iwl3945_tpt_entry { |
b481de9c ZY |
93 | s8 min_rssi; |
94 | u8 index; | |
95 | }; | |
96 | ||
bb8c093b | 97 | static struct iwl3945_tpt_entry iwl3945_tpt_table_a[] = { |
b481de9c ZY |
98 | {-60, IWL_RATE_54M_INDEX}, |
99 | {-64, IWL_RATE_48M_INDEX}, | |
100 | {-72, IWL_RATE_36M_INDEX}, | |
101 | {-80, IWL_RATE_24M_INDEX}, | |
102 | {-84, IWL_RATE_18M_INDEX}, | |
103 | {-85, IWL_RATE_12M_INDEX}, | |
104 | {-87, IWL_RATE_9M_INDEX}, | |
105 | {-89, IWL_RATE_6M_INDEX} | |
106 | }; | |
107 | ||
bb8c093b | 108 | static struct iwl3945_tpt_entry iwl3945_tpt_table_g[] = { |
b481de9c ZY |
109 | {-60, IWL_RATE_54M_INDEX}, |
110 | {-64, IWL_RATE_48M_INDEX}, | |
111 | {-68, IWL_RATE_36M_INDEX}, | |
112 | {-80, IWL_RATE_24M_INDEX}, | |
113 | {-84, IWL_RATE_18M_INDEX}, | |
114 | {-85, IWL_RATE_12M_INDEX}, | |
115 | {-86, IWL_RATE_11M_INDEX}, | |
116 | {-88, IWL_RATE_5M_INDEX}, | |
117 | {-90, IWL_RATE_2M_INDEX}, | |
118 | {-92, IWL_RATE_1M_INDEX} | |
119 | }; | |
120 | ||
121 | #define IWL_RATE_MAX_WINDOW 62 | |
74221d07 | 122 | #define IWL_RATE_FLUSH (3*HZ) |
b481de9c | 123 | #define IWL_RATE_WIN_FLUSH (HZ/2) |
d9829a67 | 124 | #define IWL39_RATE_HIGH_TH 11520 |
74221d07 AM |
125 | #define IWL_SUCCESS_UP_TH 8960 |
126 | #define IWL_SUCCESS_DOWN_TH 10880 | |
b481de9c ZY |
127 | #define IWL_RATE_MIN_FAILURE_TH 8 |
128 | #define IWL_RATE_MIN_SUCCESS_TH 8 | |
129 | #define IWL_RATE_DECREASE_TH 1920 | |
dd5b687e | 130 | #define IWL_RATE_RETRY_TH 15 |
b481de9c | 131 | |
8318d78a | 132 | static u8 iwl3945_get_rate_index_by_rssi(s32 rssi, enum ieee80211_band band) |
b481de9c ZY |
133 | { |
134 | u32 index = 0; | |
135 | u32 table_size = 0; | |
bb8c093b | 136 | struct iwl3945_tpt_entry *tpt_table = NULL; |
b481de9c ZY |
137 | |
138 | if ((rssi < IWL_MIN_RSSI_VAL) || (rssi > IWL_MAX_RSSI_VAL)) | |
139 | rssi = IWL_MIN_RSSI_VAL; | |
140 | ||
8318d78a JB |
141 | switch (band) { |
142 | case IEEE80211_BAND_2GHZ: | |
bb8c093b CH |
143 | tpt_table = iwl3945_tpt_table_g; |
144 | table_size = ARRAY_SIZE(iwl3945_tpt_table_g); | |
b481de9c ZY |
145 | break; |
146 | ||
8318d78a | 147 | case IEEE80211_BAND_5GHZ: |
bb8c093b CH |
148 | tpt_table = iwl3945_tpt_table_a; |
149 | table_size = ARRAY_SIZE(iwl3945_tpt_table_a); | |
b481de9c ZY |
150 | break; |
151 | ||
152 | default: | |
8318d78a | 153 | BUG(); |
b481de9c ZY |
154 | break; |
155 | } | |
156 | ||
157 | while ((index < table_size) && (rssi < tpt_table[index].min_rssi)) | |
158 | index++; | |
159 | ||
160 | index = min(index, (table_size - 1)); | |
161 | ||
162 | return tpt_table[index].index; | |
163 | } | |
164 | ||
bb8c093b | 165 | static void iwl3945_clear_window(struct iwl3945_rate_scale_data *window) |
b481de9c ZY |
166 | { |
167 | window->data = 0; | |
168 | window->success_counter = 0; | |
28447f3c | 169 | window->success_ratio = -1; |
b481de9c | 170 | window->counter = 0; |
d9829a67 | 171 | window->average_tpt = IWL_INVALID_VALUE; |
b481de9c ZY |
172 | window->stamp = 0; |
173 | } | |
174 | ||
175 | /** | |
bb8c093b | 176 | * iwl3945_rate_scale_flush_windows - flush out the rate scale windows |
b481de9c ZY |
177 | * |
178 | * Returns the number of windows that have gathered data but were | |
179 | * not flushed. If there were any that were not flushed, then | |
180 | * reschedule the rate flushing routine. | |
181 | */ | |
fa254a68 | 182 | static int iwl3945_rate_scale_flush_windows(struct iwl3945_rs_sta *rs_sta) |
b481de9c ZY |
183 | { |
184 | int unflushed = 0; | |
185 | int i; | |
186 | unsigned long flags; | |
7530f85f | 187 | struct iwl_priv *priv __maybe_unused = rs_sta->priv; |
b481de9c ZY |
188 | |
189 | /* | |
190 | * For each rate, if we have collected data on that rate | |
191 | * and it has been more than IWL_RATE_WIN_FLUSH | |
192 | * since we flushed, clear out the gathered statistics | |
193 | */ | |
d9829a67 | 194 | for (i = 0; i < IWL_RATE_COUNT_3945; i++) { |
fa254a68 | 195 | if (!rs_sta->win[i].counter) |
b481de9c ZY |
196 | continue; |
197 | ||
fa254a68 TW |
198 | spin_lock_irqsave(&rs_sta->lock, flags); |
199 | if (time_after(jiffies, rs_sta->win[i].stamp + | |
b481de9c | 200 | IWL_RATE_WIN_FLUSH)) { |
e1623446 | 201 | IWL_DEBUG_RATE(priv, "flushing %d samples of rate " |
b481de9c | 202 | "index %d\n", |
fa254a68 TW |
203 | rs_sta->win[i].counter, i); |
204 | iwl3945_clear_window(&rs_sta->win[i]); | |
b481de9c ZY |
205 | } else |
206 | unflushed++; | |
fa254a68 | 207 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c ZY |
208 | } |
209 | ||
210 | return unflushed; | |
211 | } | |
212 | ||
213 | #define IWL_RATE_FLUSH_MAX 5000 /* msec */ | |
214 | #define IWL_RATE_FLUSH_MIN 50 /* msec */ | |
74221d07 | 215 | #define IWL_AVERAGE_PACKETS 1500 |
b481de9c | 216 | |
bb8c093b | 217 | static void iwl3945_bg_rate_scale_flush(unsigned long data) |
b481de9c | 218 | { |
fa254a68 | 219 | struct iwl3945_rs_sta *rs_sta = (void *)data; |
7530f85f | 220 | struct iwl_priv *priv __maybe_unused = rs_sta->priv; |
b481de9c ZY |
221 | int unflushed = 0; |
222 | unsigned long flags; | |
223 | u32 packet_count, duration, pps; | |
224 | ||
e1623446 | 225 | IWL_DEBUG_RATE(priv, "enter\n"); |
b481de9c | 226 | |
fa254a68 | 227 | unflushed = iwl3945_rate_scale_flush_windows(rs_sta); |
b481de9c | 228 | |
fa254a68 | 229 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 230 | |
b481de9c | 231 | /* Number of packets Rx'd since last time this timer ran */ |
fa254a68 | 232 | packet_count = (rs_sta->tx_packets - rs_sta->last_tx_packets) + 1; |
b481de9c | 233 | |
fa254a68 | 234 | rs_sta->last_tx_packets = rs_sta->tx_packets + 1; |
b481de9c ZY |
235 | |
236 | if (unflushed) { | |
237 | duration = | |
fa254a68 | 238 | jiffies_to_msecs(jiffies - rs_sta->last_partial_flush); |
b481de9c | 239 | |
e1623446 | 240 | IWL_DEBUG_RATE(priv, "Tx'd %d packets in %dms\n", |
b481de9c ZY |
241 | packet_count, duration); |
242 | ||
243 | /* Determine packets per second */ | |
244 | if (duration) | |
245 | pps = (packet_count * 1000) / duration; | |
246 | else | |
247 | pps = 0; | |
248 | ||
249 | if (pps) { | |
74221d07 | 250 | duration = (IWL_AVERAGE_PACKETS * 1000) / pps; |
b481de9c ZY |
251 | if (duration < IWL_RATE_FLUSH_MIN) |
252 | duration = IWL_RATE_FLUSH_MIN; | |
74221d07 AM |
253 | else if (duration > IWL_RATE_FLUSH_MAX) |
254 | duration = IWL_RATE_FLUSH_MAX; | |
b481de9c ZY |
255 | } else |
256 | duration = IWL_RATE_FLUSH_MAX; | |
257 | ||
fa254a68 | 258 | rs_sta->flush_time = msecs_to_jiffies(duration); |
b481de9c | 259 | |
e1623446 | 260 | IWL_DEBUG_RATE(priv, "new flush period: %d msec ave %d\n", |
b481de9c ZY |
261 | duration, packet_count); |
262 | ||
fa254a68 TW |
263 | mod_timer(&rs_sta->rate_scale_flush, jiffies + |
264 | rs_sta->flush_time); | |
b481de9c | 265 | |
fa254a68 | 266 | rs_sta->last_partial_flush = jiffies; |
74221d07 AM |
267 | } else { |
268 | rs_sta->flush_time = IWL_RATE_FLUSH; | |
269 | rs_sta->flush_pending = 0; | |
b481de9c | 270 | } |
b481de9c ZY |
271 | /* If there weren't any unflushed entries, we don't schedule the timer |
272 | * to run again */ | |
273 | ||
fa254a68 | 274 | rs_sta->last_flush = jiffies; |
b481de9c | 275 | |
fa254a68 | 276 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c | 277 | |
e1623446 | 278 | IWL_DEBUG_RATE(priv, "leave\n"); |
b481de9c ZY |
279 | } |
280 | ||
281 | /** | |
bb8c093b | 282 | * iwl3945_collect_tx_data - Update the success/failure sliding window |
b481de9c ZY |
283 | * |
284 | * We keep a sliding window of the last 64 packets transmitted | |
285 | * at this rate. window->data contains the bitmask of successful | |
286 | * packets. | |
287 | */ | |
fa254a68 | 288 | static void iwl3945_collect_tx_data(struct iwl3945_rs_sta *rs_sta, |
bb8c093b | 289 | struct iwl3945_rate_scale_data *window, |
74221d07 | 290 | int success, int retries, int index) |
b481de9c ZY |
291 | { |
292 | unsigned long flags; | |
74221d07 | 293 | s32 fail_count; |
7530f85f | 294 | struct iwl_priv *priv __maybe_unused = rs_sta->priv; |
b481de9c ZY |
295 | |
296 | if (!retries) { | |
e1623446 | 297 | IWL_DEBUG_RATE(priv, "leave: retries == 0 -- should be at least 1\n"); |
b481de9c ZY |
298 | return; |
299 | } | |
300 | ||
74221d07 | 301 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 302 | |
dd5b687e AK |
303 | /* |
304 | * Keep track of only the latest 62 tx frame attempts in this rate's | |
305 | * history window; anything older isn't really relevant any more. | |
306 | * If we have filled up the sliding window, drop the oldest attempt; | |
307 | * if the oldest attempt (highest bit in bitmap) shows "success", | |
308 | * subtract "1" from the success counter (this is the main reason | |
309 | * we keep these bitmaps!). | |
310 | * */ | |
311 | while (retries > 0) { | |
312 | if (window->counter >= IWL_RATE_MAX_WINDOW) { | |
313 | ||
314 | /* remove earliest */ | |
315 | window->counter = IWL_RATE_MAX_WINDOW - 1; | |
316 | ||
317 | if (window->data & (1ULL << (IWL_RATE_MAX_WINDOW - 1))) { | |
318 | window->data &= ~(1ULL << (IWL_RATE_MAX_WINDOW - 1)); | |
b481de9c | 319 | window->success_counter--; |
dd5b687e AK |
320 | } |
321 | } | |
b481de9c | 322 | |
dd5b687e AK |
323 | /* Increment frames-attempted counter */ |
324 | window->counter++; | |
b481de9c | 325 | |
dd5b687e AK |
326 | /* Shift bitmap by one frame (throw away oldest history), |
327 | * OR in "1", and increment "success" if this | |
328 | * frame was successful. */ | |
329 | window->data <<= 1; | |
330 | if (success > 0) { | |
b481de9c | 331 | window->success_counter++; |
dd5b687e AK |
332 | window->data |= 0x1; |
333 | success--; | |
b481de9c ZY |
334 | } |
335 | ||
dd5b687e | 336 | retries--; |
b481de9c | 337 | } |
74221d07 | 338 | |
dd5b687e AK |
339 | /* Calculate current success ratio, avoid divide-by-0! */ |
340 | if (window->counter > 0) | |
341 | window->success_ratio = 128 * (100 * window->success_counter) | |
342 | / window->counter; | |
343 | else | |
344 | window->success_ratio = IWL_INVALID_VALUE; | |
345 | ||
74221d07 | 346 | fail_count = window->counter - window->success_counter; |
dd5b687e AK |
347 | |
348 | /* Calculate average throughput, if we have enough history. */ | |
74221d07 AM |
349 | if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) || |
350 | (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH)) | |
351 | window->average_tpt = ((window->success_ratio * | |
352 | rs_sta->expected_tpt[index] + 64) / 128); | |
353 | else | |
d9829a67 | 354 | window->average_tpt = IWL_INVALID_VALUE; |
74221d07 | 355 | |
dd5b687e AK |
356 | /* Tag this window as having been updated */ |
357 | window->stamp = jiffies; | |
358 | ||
74221d07 AM |
359 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
360 | ||
b481de9c ZY |
361 | } |
362 | ||
7262796a | 363 | static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband, |
4b7679a5 | 364 | struct ieee80211_sta *sta, void *priv_sta) |
b481de9c | 365 | { |
4b7679a5 | 366 | struct iwl3945_rs_sta *rs_sta = priv_sta; |
4a8a4322 | 367 | struct iwl_priv *priv = (struct iwl_priv *)priv_r; |
b481de9c ZY |
368 | int i; |
369 | ||
e1623446 | 370 | IWL_DEBUG_RATE(priv, "enter\n"); |
b481de9c ZY |
371 | |
372 | /* TODO: what is a good starting rate for STA? About middle? Maybe not | |
373 | * the lowest or the highest rate.. Could consider using RSSI from | |
374 | * previous packets? Need to have IEEE 802.1X auth succeed immediately | |
375 | * after assoc.. */ | |
376 | ||
7262796a | 377 | for (i = sband->n_bitrates - 1; i >= 0; i--) { |
4b7679a5 | 378 | if (sta->supp_rates[sband->band] & (1 << i)) { |
ae17e986 | 379 | rs_sta->last_txrate_idx = i; |
b481de9c ZY |
380 | break; |
381 | } | |
382 | } | |
383 | ||
7262796a | 384 | priv->sta_supp_rates = sta->supp_rates[sband->band]; |
8318d78a | 385 | /* For 5 GHz band it start at IWL_FIRST_OFDM_RATE */ |
7262796a | 386 | if (sband->band == IEEE80211_BAND_5GHZ) { |
b7e35008 | 387 | rs_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE; |
7262796a AM |
388 | priv->sta_supp_rates = priv->sta_supp_rates << |
389 | IWL_FIRST_OFDM_RATE; | |
390 | } | |
391 | ||
14577f23 | 392 | |
e1623446 | 393 | IWL_DEBUG_RATE(priv, "leave\n"); |
b481de9c ZY |
394 | } |
395 | ||
4b7679a5 | 396 | static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) |
b481de9c | 397 | { |
4b7679a5 | 398 | return hw->priv; |
b481de9c ZY |
399 | } |
400 | ||
01ebd063 | 401 | /* rate scale requires free function to be implemented */ |
b481de9c ZY |
402 | static void rs_free(void *priv) |
403 | { | |
404 | return; | |
405 | } | |
4b7679a5 | 406 | |
40b8ec0b | 407 | static void *rs_alloc_sta(void *iwl_priv, struct ieee80211_sta *sta, gfp_t gfp) |
b481de9c | 408 | { |
fa254a68 | 409 | struct iwl3945_rs_sta *rs_sta; |
4b7679a5 | 410 | struct iwl3945_sta_priv *psta = (void *) sta->drv_priv; |
4a8a4322 | 411 | struct iwl_priv *priv = iwl_priv; |
b481de9c ZY |
412 | int i; |
413 | ||
4b7679a5 JB |
414 | /* |
415 | * XXX: If it's using sta->drv_priv anyway, it might | |
416 | * as well just put all the information there. | |
417 | */ | |
418 | ||
e1623446 | 419 | IWL_DEBUG_RATE(priv, "enter\n"); |
b481de9c | 420 | |
fa254a68 TW |
421 | rs_sta = kzalloc(sizeof(struct iwl3945_rs_sta), gfp); |
422 | if (!rs_sta) { | |
e1623446 | 423 | IWL_DEBUG_RATE(priv, "leave: ENOMEM\n"); |
b481de9c ZY |
424 | return NULL; |
425 | } | |
426 | ||
4b7679a5 JB |
427 | psta->rs_sta = rs_sta; |
428 | ||
fa254a68 | 429 | spin_lock_init(&rs_sta->lock); |
b481de9c | 430 | |
40b8ec0b SO |
431 | rs_sta->priv = priv; |
432 | ||
fa254a68 | 433 | rs_sta->start_rate = IWL_RATE_INVALID; |
b481de9c ZY |
434 | |
435 | /* default to just 802.11b */ | |
fa254a68 | 436 | rs_sta->expected_tpt = iwl3945_expected_tpt_b; |
b481de9c | 437 | |
fa254a68 TW |
438 | rs_sta->last_partial_flush = jiffies; |
439 | rs_sta->last_flush = jiffies; | |
440 | rs_sta->flush_time = IWL_RATE_FLUSH; | |
441 | rs_sta->last_tx_packets = 0; | |
442 | rs_sta->ibss_sta_added = 0; | |
b481de9c | 443 | |
fa254a68 TW |
444 | init_timer(&rs_sta->rate_scale_flush); |
445 | rs_sta->rate_scale_flush.data = (unsigned long)rs_sta; | |
446 | rs_sta->rate_scale_flush.function = &iwl3945_bg_rate_scale_flush; | |
b481de9c | 447 | |
d9829a67 | 448 | for (i = 0; i < IWL_RATE_COUNT_3945; i++) |
fa254a68 | 449 | iwl3945_clear_window(&rs_sta->win[i]); |
b481de9c | 450 | |
e1623446 | 451 | IWL_DEBUG_RATE(priv, "leave\n"); |
b481de9c | 452 | |
fa254a68 | 453 | return rs_sta; |
b481de9c ZY |
454 | } |
455 | ||
40b8ec0b | 456 | static void rs_free_sta(void *iwl_priv, struct ieee80211_sta *sta, |
4b7679a5 | 457 | void *priv_sta) |
b481de9c | 458 | { |
4b7679a5 | 459 | struct iwl3945_sta_priv *psta = (void *) sta->drv_priv; |
fa254a68 | 460 | struct iwl3945_rs_sta *rs_sta = priv_sta; |
7530f85f | 461 | struct iwl_priv *priv __maybe_unused = rs_sta->priv; |
b481de9c | 462 | |
4b7679a5 JB |
463 | psta->rs_sta = NULL; |
464 | ||
e1623446 | 465 | IWL_DEBUG_RATE(priv, "enter\n"); |
fa254a68 TW |
466 | del_timer_sync(&rs_sta->rate_scale_flush); |
467 | kfree(rs_sta); | |
e1623446 | 468 | IWL_DEBUG_RATE(priv, "leave\n"); |
b481de9c ZY |
469 | } |
470 | ||
14577f23 | 471 | |
b481de9c ZY |
472 | /** |
473 | * rs_tx_status - Update rate control values based on Tx results | |
474 | * | |
4a8a4322 | 475 | * NOTE: Uses iwl_priv->retry_rate for the # of retries attempted by |
b481de9c ZY |
476 | * the hardware for each rate. |
477 | */ | |
4b7679a5 JB |
478 | static void rs_tx_status(void *priv_rate, struct ieee80211_supported_band *sband, |
479 | struct ieee80211_sta *sta, void *priv_sta, | |
e039fa4a | 480 | struct sk_buff *skb) |
b481de9c | 481 | { |
74221d07 | 482 | s8 retries = 0, current_count; |
b481de9c ZY |
483 | int scale_rate_index, first_index, last_index; |
484 | unsigned long flags; | |
4a8a4322 | 485 | struct iwl_priv *priv = (struct iwl_priv *)priv_rate; |
4b7679a5 | 486 | struct iwl3945_rs_sta *rs_sta = priv_sta; |
e039fa4a | 487 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
8318d78a | 488 | |
e1623446 | 489 | IWL_DEBUG_RATE(priv, "enter\n"); |
28447f3c | 490 | |
dd5b687e AK |
491 | retries = info->status.rates[0].count - 1; |
492 | /* Sanity Check for retries */ | |
493 | if (retries > IWL_RATE_RETRY_TH) | |
494 | retries = IWL_RATE_RETRY_TH; | |
e6a9854b JB |
495 | |
496 | first_index = sband->bitrates[info->status.rates[0].idx].hw_value; | |
d9829a67 | 497 | if ((first_index < 0) || (first_index >= IWL_RATE_COUNT_3945)) { |
e1623446 | 498 | IWL_DEBUG_RATE(priv, "leave: Rate out of bounds: %d\n", first_index); |
b481de9c ZY |
499 | return; |
500 | } | |
501 | ||
4b7679a5 | 502 | if (!priv_sta) { |
e1623446 | 503 | IWL_DEBUG_RATE(priv, "leave: No STA priv data to update!\n"); |
b481de9c ZY |
504 | return; |
505 | } | |
506 | ||
fa254a68 | 507 | rs_sta->tx_packets++; |
b481de9c ZY |
508 | |
509 | scale_rate_index = first_index; | |
510 | last_index = first_index; | |
511 | ||
512 | /* | |
513 | * Update the window for each rate. We determine which rates | |
514 | * were Tx'd based on the total number of retries vs. the number | |
515 | * of retries configured for each rate -- currently set to the | |
516 | * priv value 'retry_rate' vs. rate specific | |
517 | * | |
518 | * On exit from this while loop last_index indicates the rate | |
519 | * at which the frame was finally transmitted (or failed if no | |
520 | * ACK) | |
521 | */ | |
74221d07 AM |
522 | while (retries > 1) { |
523 | if ((retries - 1) < priv->retry_rate) { | |
524 | current_count = (retries - 1); | |
b481de9c ZY |
525 | last_index = scale_rate_index; |
526 | } else { | |
527 | current_count = priv->retry_rate; | |
e6a9854b | 528 | last_index = iwl3945_rs_next_rate(priv, |
14577f23 | 529 | scale_rate_index); |
b481de9c ZY |
530 | } |
531 | ||
532 | /* Update this rate accounting for as many retries | |
533 | * as was used for it (per current_count) */ | |
fa254a68 TW |
534 | iwl3945_collect_tx_data(rs_sta, |
535 | &rs_sta->win[scale_rate_index], | |
74221d07 | 536 | 0, current_count, scale_rate_index); |
e1623446 | 537 | IWL_DEBUG_RATE(priv, "Update rate %d for %d retries.\n", |
b481de9c ZY |
538 | scale_rate_index, current_count); |
539 | ||
540 | retries -= current_count; | |
541 | ||
74221d07 | 542 | scale_rate_index = last_index; |
b481de9c ZY |
543 | } |
544 | ||
14577f23 | 545 | |
b481de9c | 546 | /* Update the last index window with success/failure based on ACK */ |
e1623446 | 547 | IWL_DEBUG_RATE(priv, "Update rate %d with %s.\n", |
b481de9c | 548 | last_index, |
e039fa4a | 549 | (info->flags & IEEE80211_TX_STAT_ACK) ? |
b481de9c | 550 | "success" : "failure"); |
fa254a68 TW |
551 | iwl3945_collect_tx_data(rs_sta, |
552 | &rs_sta->win[last_index], | |
74221d07 | 553 | info->flags & IEEE80211_TX_STAT_ACK, 1, last_index); |
b481de9c ZY |
554 | |
555 | /* We updated the rate scale window -- if its been more than | |
556 | * flush_time since the last run, schedule the flush | |
557 | * again */ | |
fa254a68 | 558 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 559 | |
fa254a68 | 560 | if (!rs_sta->flush_pending && |
74221d07 | 561 | time_after(jiffies, rs_sta->last_flush + |
fa254a68 | 562 | rs_sta->flush_time)) { |
b481de9c | 563 | |
74221d07 | 564 | rs_sta->last_partial_flush = jiffies; |
fa254a68 TW |
565 | rs_sta->flush_pending = 1; |
566 | mod_timer(&rs_sta->rate_scale_flush, | |
567 | jiffies + rs_sta->flush_time); | |
b481de9c ZY |
568 | } |
569 | ||
fa254a68 | 570 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c | 571 | |
e1623446 | 572 | IWL_DEBUG_RATE(priv, "leave\n"); |
b481de9c ZY |
573 | |
574 | return; | |
575 | } | |
576 | ||
fa254a68 | 577 | static u16 iwl3945_get_adjacent_rate(struct iwl3945_rs_sta *rs_sta, |
8318d78a | 578 | u8 index, u16 rate_mask, enum ieee80211_band band) |
b481de9c ZY |
579 | { |
580 | u8 high = IWL_RATE_INVALID; | |
581 | u8 low = IWL_RATE_INVALID; | |
7530f85f | 582 | struct iwl_priv *priv __maybe_unused = rs_sta->priv; |
b481de9c | 583 | |
01ebd063 | 584 | /* 802.11A walks to the next literal adjacent rate in |
b481de9c | 585 | * the rate table */ |
8318d78a | 586 | if (unlikely(band == IEEE80211_BAND_5GHZ)) { |
b481de9c ZY |
587 | int i; |
588 | u32 mask; | |
589 | ||
590 | /* Find the previous rate that is in the rate mask */ | |
591 | i = index - 1; | |
592 | for (mask = (1 << i); i >= 0; i--, mask >>= 1) { | |
593 | if (rate_mask & mask) { | |
594 | low = i; | |
595 | break; | |
596 | } | |
597 | } | |
598 | ||
599 | /* Find the next rate that is in the rate mask */ | |
600 | i = index + 1; | |
d9829a67 SO |
601 | for (mask = (1 << i); i < IWL_RATE_COUNT_3945; |
602 | i++, mask <<= 1) { | |
b481de9c ZY |
603 | if (rate_mask & mask) { |
604 | high = i; | |
605 | break; | |
606 | } | |
607 | } | |
608 | ||
609 | return (high << 8) | low; | |
610 | } | |
611 | ||
612 | low = index; | |
613 | while (low != IWL_RATE_INVALID) { | |
fa254a68 | 614 | if (rs_sta->tgg) |
bb8c093b | 615 | low = iwl3945_rates[low].prev_rs_tgg; |
b481de9c | 616 | else |
bb8c093b | 617 | low = iwl3945_rates[low].prev_rs; |
b481de9c ZY |
618 | if (low == IWL_RATE_INVALID) |
619 | break; | |
620 | if (rate_mask & (1 << low)) | |
621 | break; | |
e1623446 | 622 | IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low); |
b481de9c ZY |
623 | } |
624 | ||
625 | high = index; | |
626 | while (high != IWL_RATE_INVALID) { | |
fa254a68 | 627 | if (rs_sta->tgg) |
bb8c093b | 628 | high = iwl3945_rates[high].next_rs_tgg; |
b481de9c | 629 | else |
bb8c093b | 630 | high = iwl3945_rates[high].next_rs; |
b481de9c ZY |
631 | if (high == IWL_RATE_INVALID) |
632 | break; | |
633 | if (rate_mask & (1 << high)) | |
634 | break; | |
e1623446 | 635 | IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high); |
b481de9c ZY |
636 | } |
637 | ||
638 | return (high << 8) | low; | |
639 | } | |
640 | ||
641 | /** | |
642 | * rs_get_rate - find the rate for the requested packet | |
643 | * | |
644 | * Returns the ieee80211_rate structure allocated by the driver. | |
645 | * | |
646 | * The rate control algorithm has no internal mapping between hw_mode's | |
647 | * rate ordering and the rate ordering used by the rate control algorithm. | |
648 | * | |
649 | * The rate control algorithm uses a single table of rates that goes across | |
650 | * the entire A/B/G spectrum vs. being limited to just one particular | |
651 | * hw_mode. | |
652 | * | |
653 | * As such, we can't convert the index obtained below into the hw_mode's | |
654 | * rate table and must reference the driver allocated rate table | |
655 | * | |
656 | */ | |
e6a9854b JB |
657 | static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, |
658 | void *priv_sta, struct ieee80211_tx_rate_control *txrc) | |
b481de9c | 659 | { |
e6a9854b JB |
660 | struct ieee80211_supported_band *sband = txrc->sband; |
661 | struct sk_buff *skb = txrc->skb; | |
b481de9c ZY |
662 | u8 low = IWL_RATE_INVALID; |
663 | u8 high = IWL_RATE_INVALID; | |
664 | u16 high_low; | |
665 | int index; | |
4b7679a5 | 666 | struct iwl3945_rs_sta *rs_sta = priv_sta; |
bb8c093b | 667 | struct iwl3945_rate_scale_data *window = NULL; |
d9829a67 SO |
668 | int current_tpt = IWL_INVALID_VALUE; |
669 | int low_tpt = IWL_INVALID_VALUE; | |
670 | int high_tpt = IWL_INVALID_VALUE; | |
b481de9c ZY |
671 | u32 fail_count; |
672 | s8 scale_action = 0; | |
673 | unsigned long flags; | |
b481de9c | 674 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
c338ba3c AM |
675 | u16 fc; |
676 | u16 rate_mask = 0; | |
c6ec7a9b | 677 | s8 max_rate_idx = -1; |
4a8a4322 | 678 | struct iwl_priv *priv = (struct iwl_priv *)priv_r; |
e6a9854b | 679 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
b481de9c | 680 | |
e1623446 | 681 | IWL_DEBUG_RATE(priv, "enter\n"); |
b481de9c | 682 | |
c338ba3c AM |
683 | if (sta) |
684 | rate_mask = sta->supp_rates[sband->band]; | |
685 | ||
2bc454b0 MW |
686 | /* Send management frames and broadcast/multicast data using lowest |
687 | * rate. */ | |
688 | fc = le16_to_cpu(hdr->frame_control); | |
689 | if ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA || | |
690 | is_multicast_ether_addr(hdr->addr1) || | |
4b7679a5 | 691 | !sta || !priv_sta) { |
e1623446 | 692 | IWL_DEBUG_RATE(priv, "leave: No STA priv data to update!\n"); |
c338ba3c AM |
693 | if (!rate_mask) |
694 | info->control.rates[0].idx = | |
695 | rate_lowest_index(sband, NULL); | |
696 | else | |
697 | info->control.rates[0].idx = | |
698 | rate_lowest_index(sband, sta); | |
1abbe498 | 699 | return; |
b481de9c ZY |
700 | } |
701 | ||
c6ec7a9b AM |
702 | /* get user max rate if set */ |
703 | max_rate_idx = txrc->max_rate_idx; | |
704 | if ((sband->band == IEEE80211_BAND_5GHZ) && (max_rate_idx != -1)) | |
705 | max_rate_idx += IWL_FIRST_OFDM_RATE; | |
706 | if ((max_rate_idx < 0) || (max_rate_idx >= IWL_RATE_COUNT)) | |
707 | max_rate_idx = -1; | |
708 | ||
d9829a67 | 709 | index = min(rs_sta->last_txrate_idx & 0xffff, IWL_RATE_COUNT_3945 - 1); |
14577f23 | 710 | |
28447f3c | 711 | if (sband->band == IEEE80211_BAND_5GHZ) |
14577f23 | 712 | rate_mask = rate_mask << IWL_FIRST_OFDM_RATE; |
b481de9c | 713 | |
05c914fe | 714 | if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) && |
fa254a68 | 715 | !rs_sta->ibss_sta_added) { |
bb8c093b | 716 | u8 sta_id = iwl3945_hw_find_station(priv, hdr->addr1); |
b481de9c ZY |
717 | |
718 | if (sta_id == IWL_INVALID_STATION) { | |
e1623446 | 719 | IWL_DEBUG_RATE(priv, "LQ: ADD station %pm\n", |
e174961c | 720 | hdr->addr1); |
bb8c093b | 721 | sta_id = iwl3945_add_station(priv, |
b481de9c ZY |
722 | hdr->addr1, 0, CMD_ASYNC); |
723 | } | |
724 | if (sta_id != IWL_INVALID_STATION) | |
fa254a68 | 725 | rs_sta->ibss_sta_added = 1; |
b481de9c ZY |
726 | } |
727 | ||
fa254a68 | 728 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 729 | |
74221d07 AM |
730 | /* for recent assoc, choose best rate regarding |
731 | * to rssi value | |
732 | */ | |
fa254a68 | 733 | if (rs_sta->start_rate != IWL_RATE_INVALID) { |
74221d07 AM |
734 | if (rs_sta->start_rate < index && |
735 | (rate_mask & (1 << rs_sta->start_rate))) | |
736 | index = rs_sta->start_rate; | |
fa254a68 | 737 | rs_sta->start_rate = IWL_RATE_INVALID; |
b481de9c ZY |
738 | } |
739 | ||
c6ec7a9b AM |
740 | /* force user max rate if set by user */ |
741 | if ((max_rate_idx != -1) && (max_rate_idx < index)) { | |
742 | if (rate_mask & (1 << max_rate_idx)) | |
743 | index = max_rate_idx; | |
744 | } | |
745 | ||
fa254a68 | 746 | window = &(rs_sta->win[index]); |
b481de9c ZY |
747 | |
748 | fail_count = window->counter - window->success_counter; | |
749 | ||
dd5b687e | 750 | if (((fail_count < IWL_RATE_MIN_FAILURE_TH) && |
b481de9c | 751 | (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))) { |
fa254a68 | 752 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c | 753 | |
e1623446 | 754 | IWL_DEBUG_RATE(priv, "Invalid average_tpt on rate %d: " |
b481de9c ZY |
755 | "counter: %d, success_counter: %d, " |
756 | "expected_tpt is %sNULL\n", | |
757 | index, | |
758 | window->counter, | |
759 | window->success_counter, | |
fa254a68 | 760 | rs_sta->expected_tpt ? "not " : ""); |
dd5b687e AK |
761 | |
762 | /* Can't calculate this yet; not enough history */ | |
763 | window->average_tpt = IWL_INVALID_VALUE; | |
b481de9c ZY |
764 | goto out; |
765 | ||
766 | } | |
767 | ||
b481de9c ZY |
768 | current_tpt = window->average_tpt; |
769 | ||
fa254a68 | 770 | high_low = iwl3945_get_adjacent_rate(rs_sta, index, rate_mask, |
28447f3c | 771 | sband->band); |
b481de9c ZY |
772 | low = high_low & 0xff; |
773 | high = (high_low >> 8) & 0xff; | |
774 | ||
c6ec7a9b AM |
775 | /* If user set max rate, dont allow higher than user constrain */ |
776 | if ((max_rate_idx != -1) && (max_rate_idx < high)) | |
777 | high = IWL_RATE_INVALID; | |
778 | ||
dd5b687e | 779 | /* Collect Measured throughputs of adjacent rates */ |
b481de9c | 780 | if (low != IWL_RATE_INVALID) |
fa254a68 | 781 | low_tpt = rs_sta->win[low].average_tpt; |
b481de9c ZY |
782 | |
783 | if (high != IWL_RATE_INVALID) | |
fa254a68 | 784 | high_tpt = rs_sta->win[high].average_tpt; |
b481de9c | 785 | |
fa254a68 | 786 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c | 787 | |
dd5b687e | 788 | scale_action = 0; |
b481de9c | 789 | |
dd5b687e | 790 | /* Low success ratio , need to drop the rate */ |
b481de9c | 791 | if ((window->success_ratio < IWL_RATE_DECREASE_TH) || !current_tpt) { |
e1623446 | 792 | IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n"); |
b481de9c | 793 | scale_action = -1; |
dd5b687e AK |
794 | |
795 | /* No throughput measured yet for adjacent rates, | |
796 | * try increase */ | |
d9829a67 | 797 | } else if ((low_tpt == IWL_INVALID_VALUE) && |
dd5b687e AK |
798 | (high_tpt == IWL_INVALID_VALUE)) { |
799 | ||
800 | if (high != IWL_RATE_INVALID && window->success_counter >= IWL_RATE_INCREASE_TH) | |
801 | scale_action = 1; | |
802 | else if (low != IWL_RATE_INVALID) | |
803 | scale_action = -1; | |
804 | ||
805 | /* Both adjacent throughputs are measured, but neither one has | |
806 | * better throughput; we're using the best rate, don't change | |
807 | * it! */ | |
808 | } else if ((low_tpt != IWL_INVALID_VALUE) && | |
d9829a67 | 809 | (high_tpt != IWL_INVALID_VALUE) && |
28447f3c | 810 | (low_tpt < current_tpt) && (high_tpt < current_tpt)) { |
dd5b687e | 811 | |
e1623446 | 812 | IWL_DEBUG_RATE(priv, "No action -- low [%d] & high [%d] < " |
b481de9c ZY |
813 | "current_tpt [%d]\n", |
814 | low_tpt, high_tpt, current_tpt); | |
815 | scale_action = 0; | |
dd5b687e AK |
816 | |
817 | /* At least one of the rates has better throughput */ | |
b481de9c | 818 | } else { |
d9829a67 | 819 | if (high_tpt != IWL_INVALID_VALUE) { |
dd5b687e AK |
820 | |
821 | /* High rate has better throughput, Increase | |
822 | * rate */ | |
823 | if (high_tpt > current_tpt && | |
824 | window->success_ratio >= IWL_RATE_INCREASE_TH) | |
b481de9c ZY |
825 | scale_action = 1; |
826 | else { | |
e1623446 TW |
827 | IWL_DEBUG_RATE(priv, |
828 | "decrease rate because of high tpt\n"); | |
b481de9c ZY |
829 | scale_action = -1; |
830 | } | |
d9829a67 | 831 | } else if (low_tpt != IWL_INVALID_VALUE) { |
b481de9c | 832 | if (low_tpt > current_tpt) { |
e1623446 TW |
833 | IWL_DEBUG_RATE(priv, |
834 | "decrease rate because of low tpt\n"); | |
b481de9c | 835 | scale_action = -1; |
dd5b687e AK |
836 | } else if (window->success_counter >= IWL_RATE_INCREASE_TH) { |
837 | /* Lower rate has better | |
838 | * throughput,decrease rate */ | |
b481de9c | 839 | scale_action = 1; |
dd5b687e | 840 | } |
b481de9c ZY |
841 | } |
842 | } | |
843 | ||
dd5b687e AK |
844 | /* Sanity check; asked for decrease, but success rate or throughput |
845 | * has been good at old rate. Don't change it. */ | |
846 | if ((scale_action == -1) && (low != IWL_RATE_INVALID) && | |
847 | ((window->success_ratio > IWL_RATE_HIGH_TH) || | |
848 | (current_tpt > (100 * rs_sta->expected_tpt[low])))) | |
849 | scale_action = 0; | |
b481de9c ZY |
850 | |
851 | switch (scale_action) { | |
852 | case -1: | |
dd5b687e AK |
853 | |
854 | /* Decrese rate */ | |
b481de9c ZY |
855 | if (low != IWL_RATE_INVALID) |
856 | index = low; | |
857 | break; | |
858 | ||
859 | case 1: | |
dd5b687e | 860 | /* Increase rate */ |
b481de9c ZY |
861 | if (high != IWL_RATE_INVALID) |
862 | index = high; | |
863 | ||
864 | break; | |
865 | ||
866 | case 0: | |
867 | default: | |
dd5b687e | 868 | /* No change */ |
b481de9c ZY |
869 | break; |
870 | } | |
871 | ||
e1623446 | 872 | IWL_DEBUG_RATE(priv, "Selected %d (action %d) - low %d high %d\n", |
b481de9c ZY |
873 | index, scale_action, low, high); |
874 | ||
875 | out: | |
876 | ||
b7e35008 | 877 | rs_sta->last_txrate_idx = index; |
28447f3c | 878 | if (sband->band == IEEE80211_BAND_5GHZ) |
e6a9854b JB |
879 | info->control.rates[0].idx = rs_sta->last_txrate_idx - |
880 | IWL_FIRST_OFDM_RATE; | |
14577f23 | 881 | else |
e6a9854b | 882 | info->control.rates[0].idx = rs_sta->last_txrate_idx; |
14577f23 | 883 | |
e1623446 | 884 | IWL_DEBUG_RATE(priv, "leave: %d\n", index); |
b481de9c ZY |
885 | } |
886 | ||
c30e30e1 AM |
887 | #ifdef CONFIG_MAC80211_DEBUGFS |
888 | static int iwl3945_open_file_generic(struct inode *inode, struct file *file) | |
889 | { | |
890 | file->private_data = inode->i_private; | |
891 | return 0; | |
892 | } | |
893 | ||
894 | static ssize_t iwl3945_sta_dbgfs_stats_table_read(struct file *file, | |
895 | char __user *user_buf, | |
896 | size_t count, loff_t *ppos) | |
897 | { | |
a412c804 | 898 | char *buff; |
c30e30e1 AM |
899 | int desc = 0; |
900 | int j; | |
a412c804 | 901 | ssize_t ret; |
c30e30e1 AM |
902 | struct iwl3945_rs_sta *lq_sta = file->private_data; |
903 | ||
a412c804 FS |
904 | buff = kmalloc(1024, GFP_KERNEL); |
905 | if (!buff) | |
906 | return -ENOMEM; | |
907 | ||
c30e30e1 AM |
908 | desc += sprintf(buff + desc, "tx packets=%d last rate index=%d\n" |
909 | "rate=0x%X flush time %d\n", | |
910 | lq_sta->tx_packets, | |
911 | lq_sta->last_txrate_idx, | |
912 | lq_sta->start_rate, jiffies_to_msecs(lq_sta->flush_time)); | |
d9829a67 | 913 | for (j = 0; j < IWL_RATE_COUNT_3945; j++) { |
c30e30e1 AM |
914 | desc += sprintf(buff+desc, |
915 | "counter=%d success=%d %%=%d\n", | |
916 | lq_sta->win[j].counter, | |
917 | lq_sta->win[j].success_counter, | |
918 | lq_sta->win[j].success_ratio); | |
919 | } | |
a412c804 FS |
920 | ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); |
921 | kfree(buff); | |
922 | return ret; | |
c30e30e1 AM |
923 | } |
924 | ||
925 | static const struct file_operations rs_sta_dbgfs_stats_table_ops = { | |
926 | .read = iwl3945_sta_dbgfs_stats_table_read, | |
927 | .open = iwl3945_open_file_generic, | |
928 | }; | |
929 | ||
930 | static void iwl3945_add_debugfs(void *priv, void *priv_sta, | |
931 | struct dentry *dir) | |
932 | { | |
933 | struct iwl3945_rs_sta *lq_sta = priv_sta; | |
934 | ||
935 | lq_sta->rs_sta_dbgfs_stats_table_file = | |
936 | debugfs_create_file("rate_stats_table", 0600, dir, | |
937 | lq_sta, &rs_sta_dbgfs_stats_table_ops); | |
938 | ||
939 | } | |
940 | ||
941 | static void iwl3945_remove_debugfs(void *priv, void *priv_sta) | |
942 | { | |
943 | struct iwl3945_rs_sta *lq_sta = priv_sta; | |
944 | debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file); | |
945 | } | |
946 | #endif | |
947 | ||
b481de9c ZY |
948 | static struct rate_control_ops rs_ops = { |
949 | .module = NULL, | |
950 | .name = RS_NAME, | |
951 | .tx_status = rs_tx_status, | |
952 | .get_rate = rs_get_rate, | |
953 | .rate_init = rs_rate_init, | |
b481de9c ZY |
954 | .alloc = rs_alloc, |
955 | .free = rs_free, | |
956 | .alloc_sta = rs_alloc_sta, | |
957 | .free_sta = rs_free_sta, | |
c30e30e1 AM |
958 | #ifdef CONFIG_MAC80211_DEBUGFS |
959 | .add_sta_debugfs = iwl3945_add_debugfs, | |
960 | .remove_sta_debugfs = iwl3945_remove_debugfs, | |
961 | #endif | |
962 | ||
b481de9c ZY |
963 | }; |
964 | ||
bb8c093b | 965 | void iwl3945_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id) |
b481de9c | 966 | { |
4a8a4322 | 967 | struct iwl_priv *priv = hw->priv; |
b481de9c ZY |
968 | s32 rssi = 0; |
969 | unsigned long flags; | |
fa254a68 | 970 | struct iwl3945_rs_sta *rs_sta; |
4b7679a5 JB |
971 | struct ieee80211_sta *sta; |
972 | struct iwl3945_sta_priv *psta; | |
b481de9c | 973 | |
e1623446 | 974 | IWL_DEBUG_RATE(priv, "enter\n"); |
b481de9c | 975 | |
d0709a65 JB |
976 | rcu_read_lock(); |
977 | ||
f2c7e521 | 978 | sta = ieee80211_find_sta(hw, priv->stations_39[sta_id].sta.sta.addr); |
52518189 | 979 | if (!sta) { |
d0709a65 | 980 | rcu_read_unlock(); |
b481de9c ZY |
981 | return; |
982 | } | |
983 | ||
52518189 | 984 | psta = (void *) sta->drv_priv; |
4b7679a5 | 985 | rs_sta = psta->rs_sta; |
b481de9c | 986 | |
fa254a68 | 987 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 988 | |
fa254a68 | 989 | rs_sta->tgg = 0; |
8318d78a JB |
990 | switch (priv->band) { |
991 | case IEEE80211_BAND_2GHZ: | |
992 | /* TODO: this always does G, not a regression */ | |
8ccde88a | 993 | if (priv->active_rxon.flags & RXON_FLG_TGG_PROTECT_MSK) { |
fa254a68 TW |
994 | rs_sta->tgg = 1; |
995 | rs_sta->expected_tpt = iwl3945_expected_tpt_g_prot; | |
b481de9c | 996 | } else |
fa254a68 | 997 | rs_sta->expected_tpt = iwl3945_expected_tpt_g; |
b481de9c ZY |
998 | break; |
999 | ||
8318d78a | 1000 | case IEEE80211_BAND_5GHZ: |
fa254a68 | 1001 | rs_sta->expected_tpt = iwl3945_expected_tpt_a; |
b481de9c | 1002 | break; |
8318d78a JB |
1003 | case IEEE80211_NUM_BANDS: |
1004 | BUG(); | |
b481de9c ZY |
1005 | break; |
1006 | } | |
1007 | ||
fa254a68 | 1008 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c ZY |
1009 | |
1010 | rssi = priv->last_rx_rssi; | |
1011 | if (rssi == 0) | |
1012 | rssi = IWL_MIN_RSSI_VAL; | |
1013 | ||
e1623446 | 1014 | IWL_DEBUG_RATE(priv, "Network RSSI: %d\n", rssi); |
b481de9c | 1015 | |
8318d78a | 1016 | rs_sta->start_rate = iwl3945_get_rate_index_by_rssi(rssi, priv->band); |
b481de9c | 1017 | |
e1623446 | 1018 | IWL_DEBUG_RATE(priv, "leave: rssi %d assign rate index: " |
fa254a68 TW |
1019 | "%d (plcp 0x%x)\n", rssi, rs_sta->start_rate, |
1020 | iwl3945_rates[rs_sta->start_rate].plcp); | |
52518189 | 1021 | rcu_read_unlock(); |
b481de9c ZY |
1022 | } |
1023 | ||
897e1cf2 | 1024 | int iwl3945_rate_control_register(void) |
b481de9c | 1025 | { |
897e1cf2 | 1026 | return ieee80211_rate_control_register(&rs_ops); |
b481de9c ZY |
1027 | } |
1028 | ||
897e1cf2 | 1029 | void iwl3945_rate_control_unregister(void) |
b481de9c ZY |
1030 | { |
1031 | ieee80211_rate_control_unregister(&rs_ops); | |
1032 | } | |
1033 | ||
1034 |