Commit | Line | Data |
---|---|---|
b481de9c ZY |
1 | /****************************************************************************** |
2 | * | |
1f447808 | 3 | * Copyright(c) 2005 - 2010 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" |
c587de0b | 41 | #include "iwl-sta.h" |
b481de9c ZY |
42 | |
43 | #define RS_NAME "iwl-3945-rs" | |
44 | ||
d9829a67 | 45 | static s32 iwl3945_expected_tpt_g[IWL_RATE_COUNT_3945] = { |
14577f23 | 46 | 7, 13, 35, 58, 0, 0, 76, 104, 130, 168, 191, 202 |
b481de9c ZY |
47 | }; |
48 | ||
d9829a67 | 49 | static s32 iwl3945_expected_tpt_g_prot[IWL_RATE_COUNT_3945] = { |
14577f23 | 50 | 7, 13, 35, 58, 0, 0, 0, 80, 93, 113, 123, 125 |
b481de9c ZY |
51 | }; |
52 | ||
d9829a67 | 53 | static s32 iwl3945_expected_tpt_a[IWL_RATE_COUNT_3945] = { |
14577f23 | 54 | 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186 |
b481de9c ZY |
55 | }; |
56 | ||
d9829a67 | 57 | static s32 iwl3945_expected_tpt_b[IWL_RATE_COUNT_3945] = { |
14577f23 | 58 | 7, 13, 35, 58, 0, 0, 0, 0, 0, 0, 0, 0 |
b481de9c ZY |
59 | }; |
60 | ||
bb8c093b | 61 | struct iwl3945_tpt_entry { |
b481de9c ZY |
62 | s8 min_rssi; |
63 | u8 index; | |
64 | }; | |
65 | ||
bb8c093b | 66 | static struct iwl3945_tpt_entry iwl3945_tpt_table_a[] = { |
b481de9c ZY |
67 | {-60, IWL_RATE_54M_INDEX}, |
68 | {-64, IWL_RATE_48M_INDEX}, | |
69 | {-72, IWL_RATE_36M_INDEX}, | |
70 | {-80, IWL_RATE_24M_INDEX}, | |
71 | {-84, IWL_RATE_18M_INDEX}, | |
72 | {-85, IWL_RATE_12M_INDEX}, | |
73 | {-87, IWL_RATE_9M_INDEX}, | |
74 | {-89, IWL_RATE_6M_INDEX} | |
75 | }; | |
76 | ||
bb8c093b | 77 | static struct iwl3945_tpt_entry iwl3945_tpt_table_g[] = { |
b481de9c ZY |
78 | {-60, IWL_RATE_54M_INDEX}, |
79 | {-64, IWL_RATE_48M_INDEX}, | |
80 | {-68, IWL_RATE_36M_INDEX}, | |
81 | {-80, IWL_RATE_24M_INDEX}, | |
82 | {-84, IWL_RATE_18M_INDEX}, | |
83 | {-85, IWL_RATE_12M_INDEX}, | |
84 | {-86, IWL_RATE_11M_INDEX}, | |
85 | {-88, IWL_RATE_5M_INDEX}, | |
86 | {-90, IWL_RATE_2M_INDEX}, | |
87 | {-92, IWL_RATE_1M_INDEX} | |
88 | }; | |
89 | ||
90 | #define IWL_RATE_MAX_WINDOW 62 | |
74221d07 | 91 | #define IWL_RATE_FLUSH (3*HZ) |
b481de9c | 92 | #define IWL_RATE_WIN_FLUSH (HZ/2) |
d9829a67 | 93 | #define IWL39_RATE_HIGH_TH 11520 |
74221d07 AM |
94 | #define IWL_SUCCESS_UP_TH 8960 |
95 | #define IWL_SUCCESS_DOWN_TH 10880 | |
82127493 | 96 | #define IWL_RATE_MIN_FAILURE_TH 6 |
b481de9c ZY |
97 | #define IWL_RATE_MIN_SUCCESS_TH 8 |
98 | #define IWL_RATE_DECREASE_TH 1920 | |
dd5b687e | 99 | #define IWL_RATE_RETRY_TH 15 |
b481de9c | 100 | |
8318d78a | 101 | static u8 iwl3945_get_rate_index_by_rssi(s32 rssi, enum ieee80211_band band) |
b481de9c ZY |
102 | { |
103 | u32 index = 0; | |
104 | u32 table_size = 0; | |
bb8c093b | 105 | struct iwl3945_tpt_entry *tpt_table = NULL; |
b481de9c ZY |
106 | |
107 | if ((rssi < IWL_MIN_RSSI_VAL) || (rssi > IWL_MAX_RSSI_VAL)) | |
108 | rssi = IWL_MIN_RSSI_VAL; | |
109 | ||
8318d78a JB |
110 | switch (band) { |
111 | case IEEE80211_BAND_2GHZ: | |
bb8c093b CH |
112 | tpt_table = iwl3945_tpt_table_g; |
113 | table_size = ARRAY_SIZE(iwl3945_tpt_table_g); | |
b481de9c ZY |
114 | break; |
115 | ||
8318d78a | 116 | case IEEE80211_BAND_5GHZ: |
bb8c093b CH |
117 | tpt_table = iwl3945_tpt_table_a; |
118 | table_size = ARRAY_SIZE(iwl3945_tpt_table_a); | |
b481de9c ZY |
119 | break; |
120 | ||
121 | default: | |
8318d78a | 122 | BUG(); |
b481de9c ZY |
123 | break; |
124 | } | |
125 | ||
126 | while ((index < table_size) && (rssi < tpt_table[index].min_rssi)) | |
127 | index++; | |
128 | ||
129 | index = min(index, (table_size - 1)); | |
130 | ||
131 | return tpt_table[index].index; | |
132 | } | |
133 | ||
bb8c093b | 134 | static void iwl3945_clear_window(struct iwl3945_rate_scale_data *window) |
b481de9c ZY |
135 | { |
136 | window->data = 0; | |
137 | window->success_counter = 0; | |
28447f3c | 138 | window->success_ratio = -1; |
b481de9c | 139 | window->counter = 0; |
d9829a67 | 140 | window->average_tpt = IWL_INVALID_VALUE; |
b481de9c ZY |
141 | window->stamp = 0; |
142 | } | |
143 | ||
144 | /** | |
bb8c093b | 145 | * iwl3945_rate_scale_flush_windows - flush out the rate scale windows |
b481de9c ZY |
146 | * |
147 | * Returns the number of windows that have gathered data but were | |
148 | * not flushed. If there were any that were not flushed, then | |
149 | * reschedule the rate flushing routine. | |
150 | */ | |
fa254a68 | 151 | static int iwl3945_rate_scale_flush_windows(struct iwl3945_rs_sta *rs_sta) |
b481de9c ZY |
152 | { |
153 | int unflushed = 0; | |
154 | int i; | |
155 | unsigned long flags; | |
7530f85f | 156 | struct iwl_priv *priv __maybe_unused = rs_sta->priv; |
b481de9c ZY |
157 | |
158 | /* | |
159 | * For each rate, if we have collected data on that rate | |
160 | * and it has been more than IWL_RATE_WIN_FLUSH | |
161 | * since we flushed, clear out the gathered statistics | |
162 | */ | |
d9829a67 | 163 | for (i = 0; i < IWL_RATE_COUNT_3945; i++) { |
fa254a68 | 164 | if (!rs_sta->win[i].counter) |
b481de9c ZY |
165 | continue; |
166 | ||
fa254a68 TW |
167 | spin_lock_irqsave(&rs_sta->lock, flags); |
168 | if (time_after(jiffies, rs_sta->win[i].stamp + | |
b481de9c | 169 | IWL_RATE_WIN_FLUSH)) { |
e1623446 | 170 | IWL_DEBUG_RATE(priv, "flushing %d samples of rate " |
b481de9c | 171 | "index %d\n", |
fa254a68 TW |
172 | rs_sta->win[i].counter, i); |
173 | iwl3945_clear_window(&rs_sta->win[i]); | |
b481de9c ZY |
174 | } else |
175 | unflushed++; | |
fa254a68 | 176 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c ZY |
177 | } |
178 | ||
179 | return unflushed; | |
180 | } | |
181 | ||
182 | #define IWL_RATE_FLUSH_MAX 5000 /* msec */ | |
183 | #define IWL_RATE_FLUSH_MIN 50 /* msec */ | |
74221d07 | 184 | #define IWL_AVERAGE_PACKETS 1500 |
b481de9c | 185 | |
bb8c093b | 186 | static void iwl3945_bg_rate_scale_flush(unsigned long data) |
b481de9c | 187 | { |
fa254a68 | 188 | struct iwl3945_rs_sta *rs_sta = (void *)data; |
7530f85f | 189 | struct iwl_priv *priv __maybe_unused = rs_sta->priv; |
b481de9c ZY |
190 | int unflushed = 0; |
191 | unsigned long flags; | |
192 | u32 packet_count, duration, pps; | |
193 | ||
e1623446 | 194 | IWL_DEBUG_RATE(priv, "enter\n"); |
b481de9c | 195 | |
fa254a68 | 196 | unflushed = iwl3945_rate_scale_flush_windows(rs_sta); |
b481de9c | 197 | |
fa254a68 | 198 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 199 | |
b481de9c | 200 | /* Number of packets Rx'd since last time this timer ran */ |
fa254a68 | 201 | packet_count = (rs_sta->tx_packets - rs_sta->last_tx_packets) + 1; |
b481de9c | 202 | |
fa254a68 | 203 | rs_sta->last_tx_packets = rs_sta->tx_packets + 1; |
b481de9c ZY |
204 | |
205 | if (unflushed) { | |
206 | duration = | |
fa254a68 | 207 | jiffies_to_msecs(jiffies - rs_sta->last_partial_flush); |
b481de9c | 208 | |
e1623446 | 209 | IWL_DEBUG_RATE(priv, "Tx'd %d packets in %dms\n", |
b481de9c ZY |
210 | packet_count, duration); |
211 | ||
212 | /* Determine packets per second */ | |
213 | if (duration) | |
214 | pps = (packet_count * 1000) / duration; | |
215 | else | |
216 | pps = 0; | |
217 | ||
218 | if (pps) { | |
74221d07 | 219 | duration = (IWL_AVERAGE_PACKETS * 1000) / pps; |
b481de9c ZY |
220 | if (duration < IWL_RATE_FLUSH_MIN) |
221 | duration = IWL_RATE_FLUSH_MIN; | |
74221d07 AM |
222 | else if (duration > IWL_RATE_FLUSH_MAX) |
223 | duration = IWL_RATE_FLUSH_MAX; | |
b481de9c ZY |
224 | } else |
225 | duration = IWL_RATE_FLUSH_MAX; | |
226 | ||
fa254a68 | 227 | rs_sta->flush_time = msecs_to_jiffies(duration); |
b481de9c | 228 | |
e1623446 | 229 | IWL_DEBUG_RATE(priv, "new flush period: %d msec ave %d\n", |
b481de9c ZY |
230 | duration, packet_count); |
231 | ||
fa254a68 TW |
232 | mod_timer(&rs_sta->rate_scale_flush, jiffies + |
233 | rs_sta->flush_time); | |
b481de9c | 234 | |
fa254a68 | 235 | rs_sta->last_partial_flush = jiffies; |
74221d07 AM |
236 | } else { |
237 | rs_sta->flush_time = IWL_RATE_FLUSH; | |
238 | rs_sta->flush_pending = 0; | |
b481de9c | 239 | } |
b481de9c ZY |
240 | /* If there weren't any unflushed entries, we don't schedule the timer |
241 | * to run again */ | |
242 | ||
fa254a68 | 243 | rs_sta->last_flush = jiffies; |
b481de9c | 244 | |
fa254a68 | 245 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c | 246 | |
e1623446 | 247 | IWL_DEBUG_RATE(priv, "leave\n"); |
b481de9c ZY |
248 | } |
249 | ||
250 | /** | |
bb8c093b | 251 | * iwl3945_collect_tx_data - Update the success/failure sliding window |
b481de9c ZY |
252 | * |
253 | * We keep a sliding window of the last 64 packets transmitted | |
254 | * at this rate. window->data contains the bitmask of successful | |
255 | * packets. | |
256 | */ | |
fa254a68 | 257 | static void iwl3945_collect_tx_data(struct iwl3945_rs_sta *rs_sta, |
bb8c093b | 258 | struct iwl3945_rate_scale_data *window, |
74221d07 | 259 | int success, int retries, int index) |
b481de9c ZY |
260 | { |
261 | unsigned long flags; | |
74221d07 | 262 | s32 fail_count; |
7530f85f | 263 | struct iwl_priv *priv __maybe_unused = rs_sta->priv; |
b481de9c ZY |
264 | |
265 | if (!retries) { | |
e1623446 | 266 | IWL_DEBUG_RATE(priv, "leave: retries == 0 -- should be at least 1\n"); |
b481de9c ZY |
267 | return; |
268 | } | |
269 | ||
74221d07 | 270 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 271 | |
dd5b687e AK |
272 | /* |
273 | * Keep track of only the latest 62 tx frame attempts in this rate's | |
274 | * history window; anything older isn't really relevant any more. | |
275 | * If we have filled up the sliding window, drop the oldest attempt; | |
276 | * if the oldest attempt (highest bit in bitmap) shows "success", | |
277 | * subtract "1" from the success counter (this is the main reason | |
278 | * we keep these bitmaps!). | |
279 | * */ | |
280 | while (retries > 0) { | |
281 | if (window->counter >= IWL_RATE_MAX_WINDOW) { | |
282 | ||
283 | /* remove earliest */ | |
284 | window->counter = IWL_RATE_MAX_WINDOW - 1; | |
285 | ||
286 | if (window->data & (1ULL << (IWL_RATE_MAX_WINDOW - 1))) { | |
287 | window->data &= ~(1ULL << (IWL_RATE_MAX_WINDOW - 1)); | |
b481de9c | 288 | window->success_counter--; |
dd5b687e AK |
289 | } |
290 | } | |
b481de9c | 291 | |
dd5b687e AK |
292 | /* Increment frames-attempted counter */ |
293 | window->counter++; | |
b481de9c | 294 | |
dd5b687e AK |
295 | /* Shift bitmap by one frame (throw away oldest history), |
296 | * OR in "1", and increment "success" if this | |
297 | * frame was successful. */ | |
298 | window->data <<= 1; | |
299 | if (success > 0) { | |
b481de9c | 300 | window->success_counter++; |
dd5b687e AK |
301 | window->data |= 0x1; |
302 | success--; | |
b481de9c ZY |
303 | } |
304 | ||
dd5b687e | 305 | retries--; |
b481de9c | 306 | } |
74221d07 | 307 | |
dd5b687e AK |
308 | /* Calculate current success ratio, avoid divide-by-0! */ |
309 | if (window->counter > 0) | |
310 | window->success_ratio = 128 * (100 * window->success_counter) | |
311 | / window->counter; | |
312 | else | |
313 | window->success_ratio = IWL_INVALID_VALUE; | |
314 | ||
74221d07 | 315 | fail_count = window->counter - window->success_counter; |
dd5b687e AK |
316 | |
317 | /* Calculate average throughput, if we have enough history. */ | |
74221d07 AM |
318 | if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) || |
319 | (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH)) | |
320 | window->average_tpt = ((window->success_ratio * | |
321 | rs_sta->expected_tpt[index] + 64) / 128); | |
322 | else | |
d9829a67 | 323 | window->average_tpt = IWL_INVALID_VALUE; |
74221d07 | 324 | |
dd5b687e AK |
325 | /* Tag this window as having been updated */ |
326 | window->stamp = jiffies; | |
327 | ||
74221d07 AM |
328 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
329 | ||
b481de9c ZY |
330 | } |
331 | ||
7262796a | 332 | static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband, |
4b7679a5 | 333 | struct ieee80211_sta *sta, void *priv_sta) |
b481de9c | 334 | { |
4b7679a5 | 335 | struct iwl3945_rs_sta *rs_sta = priv_sta; |
4a8a4322 | 336 | struct iwl_priv *priv = (struct iwl_priv *)priv_r; |
b481de9c ZY |
337 | int i; |
338 | ||
e1623446 | 339 | IWL_DEBUG_RATE(priv, "enter\n"); |
b481de9c | 340 | |
62a94926 RC |
341 | spin_lock_init(&rs_sta->lock); |
342 | ||
343 | rs_sta->priv = priv; | |
344 | ||
345 | rs_sta->start_rate = IWL_RATE_INVALID; | |
346 | ||
347 | /* default to just 802.11b */ | |
348 | rs_sta->expected_tpt = iwl3945_expected_tpt_b; | |
349 | ||
350 | rs_sta->last_partial_flush = jiffies; | |
351 | rs_sta->last_flush = jiffies; | |
352 | rs_sta->flush_time = IWL_RATE_FLUSH; | |
353 | rs_sta->last_tx_packets = 0; | |
354 | rs_sta->ibss_sta_added = 0; | |
355 | ||
356 | init_timer(&rs_sta->rate_scale_flush); | |
357 | rs_sta->rate_scale_flush.data = (unsigned long)rs_sta; | |
d20a80f0 | 358 | rs_sta->rate_scale_flush.function = iwl3945_bg_rate_scale_flush; |
62a94926 RC |
359 | |
360 | for (i = 0; i < IWL_RATE_COUNT_3945; i++) | |
361 | iwl3945_clear_window(&rs_sta->win[i]); | |
362 | ||
b481de9c ZY |
363 | /* TODO: what is a good starting rate for STA? About middle? Maybe not |
364 | * the lowest or the highest rate.. Could consider using RSSI from | |
365 | * previous packets? Need to have IEEE 802.1X auth succeed immediately | |
366 | * after assoc.. */ | |
367 | ||
7262796a | 368 | for (i = sband->n_bitrates - 1; i >= 0; i--) { |
4b7679a5 | 369 | if (sta->supp_rates[sband->band] & (1 << i)) { |
ae17e986 | 370 | rs_sta->last_txrate_idx = i; |
b481de9c ZY |
371 | break; |
372 | } | |
373 | } | |
374 | ||
7262796a | 375 | priv->sta_supp_rates = sta->supp_rates[sband->band]; |
8318d78a | 376 | /* For 5 GHz band it start at IWL_FIRST_OFDM_RATE */ |
7262796a | 377 | if (sband->band == IEEE80211_BAND_5GHZ) { |
b7e35008 | 378 | rs_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE; |
7262796a AM |
379 | priv->sta_supp_rates = priv->sta_supp_rates << |
380 | IWL_FIRST_OFDM_RATE; | |
381 | } | |
382 | ||
14577f23 | 383 | |
e1623446 | 384 | IWL_DEBUG_RATE(priv, "leave\n"); |
b481de9c ZY |
385 | } |
386 | ||
4b7679a5 | 387 | static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) |
b481de9c | 388 | { |
4b7679a5 | 389 | return hw->priv; |
b481de9c ZY |
390 | } |
391 | ||
01ebd063 | 392 | /* rate scale requires free function to be implemented */ |
b481de9c ZY |
393 | static void rs_free(void *priv) |
394 | { | |
395 | return; | |
396 | } | |
4b7679a5 | 397 | |
40b8ec0b | 398 | static void *rs_alloc_sta(void *iwl_priv, struct ieee80211_sta *sta, gfp_t gfp) |
b481de9c | 399 | { |
fa254a68 | 400 | struct iwl3945_rs_sta *rs_sta; |
4b7679a5 | 401 | struct iwl3945_sta_priv *psta = (void *) sta->drv_priv; |
62a94926 | 402 | struct iwl_priv *priv __maybe_unused = iwl_priv; |
4b7679a5 | 403 | |
e1623446 | 404 | IWL_DEBUG_RATE(priv, "enter\n"); |
b481de9c | 405 | |
62a94926 | 406 | rs_sta = &psta->rs_sta; |
b481de9c | 407 | |
e1623446 | 408 | IWL_DEBUG_RATE(priv, "leave\n"); |
b481de9c | 409 | |
fa254a68 | 410 | return rs_sta; |
b481de9c ZY |
411 | } |
412 | ||
40b8ec0b | 413 | static void rs_free_sta(void *iwl_priv, struct ieee80211_sta *sta, |
4b7679a5 | 414 | void *priv_sta) |
b481de9c | 415 | { |
4b7679a5 | 416 | struct iwl3945_sta_priv *psta = (void *) sta->drv_priv; |
62a94926 | 417 | struct iwl3945_rs_sta *rs_sta = &psta->rs_sta; |
7530f85f | 418 | struct iwl_priv *priv __maybe_unused = rs_sta->priv; |
b481de9c | 419 | |
e1623446 | 420 | IWL_DEBUG_RATE(priv, "enter\n"); |
fa254a68 | 421 | del_timer_sync(&rs_sta->rate_scale_flush); |
e1623446 | 422 | IWL_DEBUG_RATE(priv, "leave\n"); |
b481de9c ZY |
423 | } |
424 | ||
14577f23 | 425 | |
b481de9c ZY |
426 | /** |
427 | * rs_tx_status - Update rate control values based on Tx results | |
428 | * | |
4a8a4322 | 429 | * NOTE: Uses iwl_priv->retry_rate for the # of retries attempted by |
b481de9c ZY |
430 | * the hardware for each rate. |
431 | */ | |
4b7679a5 JB |
432 | static void rs_tx_status(void *priv_rate, struct ieee80211_supported_band *sband, |
433 | struct ieee80211_sta *sta, void *priv_sta, | |
e039fa4a | 434 | struct sk_buff *skb) |
b481de9c | 435 | { |
74221d07 | 436 | s8 retries = 0, current_count; |
b481de9c ZY |
437 | int scale_rate_index, first_index, last_index; |
438 | unsigned long flags; | |
4a8a4322 | 439 | struct iwl_priv *priv = (struct iwl_priv *)priv_rate; |
4b7679a5 | 440 | struct iwl3945_rs_sta *rs_sta = priv_sta; |
e039fa4a | 441 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
8318d78a | 442 | |
e1623446 | 443 | IWL_DEBUG_RATE(priv, "enter\n"); |
28447f3c | 444 | |
82127493 | 445 | retries = info->status.rates[0].count; |
dd5b687e AK |
446 | /* Sanity Check for retries */ |
447 | if (retries > IWL_RATE_RETRY_TH) | |
448 | retries = IWL_RATE_RETRY_TH; | |
e6a9854b JB |
449 | |
450 | first_index = sband->bitrates[info->status.rates[0].idx].hw_value; | |
d9829a67 | 451 | if ((first_index < 0) || (first_index >= IWL_RATE_COUNT_3945)) { |
e1623446 | 452 | IWL_DEBUG_RATE(priv, "leave: Rate out of bounds: %d\n", first_index); |
b481de9c ZY |
453 | return; |
454 | } | |
455 | ||
4b7679a5 | 456 | if (!priv_sta) { |
e1623446 | 457 | IWL_DEBUG_RATE(priv, "leave: No STA priv data to update!\n"); |
b481de9c ZY |
458 | return; |
459 | } | |
460 | ||
fa254a68 | 461 | rs_sta->tx_packets++; |
b481de9c ZY |
462 | |
463 | scale_rate_index = first_index; | |
464 | last_index = first_index; | |
465 | ||
466 | /* | |
467 | * Update the window for each rate. We determine which rates | |
468 | * were Tx'd based on the total number of retries vs. the number | |
469 | * of retries configured for each rate -- currently set to the | |
470 | * priv value 'retry_rate' vs. rate specific | |
471 | * | |
472 | * On exit from this while loop last_index indicates the rate | |
473 | * at which the frame was finally transmitted (or failed if no | |
474 | * ACK) | |
475 | */ | |
74221d07 AM |
476 | while (retries > 1) { |
477 | if ((retries - 1) < priv->retry_rate) { | |
478 | current_count = (retries - 1); | |
b481de9c ZY |
479 | last_index = scale_rate_index; |
480 | } else { | |
481 | current_count = priv->retry_rate; | |
e6a9854b | 482 | last_index = iwl3945_rs_next_rate(priv, |
14577f23 | 483 | scale_rate_index); |
b481de9c ZY |
484 | } |
485 | ||
486 | /* Update this rate accounting for as many retries | |
487 | * as was used for it (per current_count) */ | |
fa254a68 TW |
488 | iwl3945_collect_tx_data(rs_sta, |
489 | &rs_sta->win[scale_rate_index], | |
74221d07 | 490 | 0, current_count, scale_rate_index); |
e1623446 | 491 | IWL_DEBUG_RATE(priv, "Update rate %d for %d retries.\n", |
b481de9c ZY |
492 | scale_rate_index, current_count); |
493 | ||
494 | retries -= current_count; | |
495 | ||
74221d07 | 496 | scale_rate_index = last_index; |
b481de9c ZY |
497 | } |
498 | ||
14577f23 | 499 | |
b481de9c | 500 | /* Update the last index window with success/failure based on ACK */ |
e1623446 | 501 | IWL_DEBUG_RATE(priv, "Update rate %d with %s.\n", |
b481de9c | 502 | last_index, |
e039fa4a | 503 | (info->flags & IEEE80211_TX_STAT_ACK) ? |
b481de9c | 504 | "success" : "failure"); |
fa254a68 TW |
505 | iwl3945_collect_tx_data(rs_sta, |
506 | &rs_sta->win[last_index], | |
74221d07 | 507 | info->flags & IEEE80211_TX_STAT_ACK, 1, last_index); |
b481de9c ZY |
508 | |
509 | /* We updated the rate scale window -- if its been more than | |
510 | * flush_time since the last run, schedule the flush | |
511 | * again */ | |
fa254a68 | 512 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 513 | |
fa254a68 | 514 | if (!rs_sta->flush_pending && |
74221d07 | 515 | time_after(jiffies, rs_sta->last_flush + |
fa254a68 | 516 | rs_sta->flush_time)) { |
b481de9c | 517 | |
74221d07 | 518 | rs_sta->last_partial_flush = jiffies; |
fa254a68 TW |
519 | rs_sta->flush_pending = 1; |
520 | mod_timer(&rs_sta->rate_scale_flush, | |
521 | jiffies + rs_sta->flush_time); | |
b481de9c ZY |
522 | } |
523 | ||
fa254a68 | 524 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c | 525 | |
e1623446 | 526 | IWL_DEBUG_RATE(priv, "leave\n"); |
b481de9c ZY |
527 | |
528 | return; | |
529 | } | |
530 | ||
fa254a68 | 531 | static u16 iwl3945_get_adjacent_rate(struct iwl3945_rs_sta *rs_sta, |
8318d78a | 532 | u8 index, u16 rate_mask, enum ieee80211_band band) |
b481de9c ZY |
533 | { |
534 | u8 high = IWL_RATE_INVALID; | |
535 | u8 low = IWL_RATE_INVALID; | |
7530f85f | 536 | struct iwl_priv *priv __maybe_unused = rs_sta->priv; |
b481de9c | 537 | |
01ebd063 | 538 | /* 802.11A walks to the next literal adjacent rate in |
b481de9c | 539 | * the rate table */ |
8318d78a | 540 | if (unlikely(band == IEEE80211_BAND_5GHZ)) { |
b481de9c ZY |
541 | int i; |
542 | u32 mask; | |
543 | ||
544 | /* Find the previous rate that is in the rate mask */ | |
545 | i = index - 1; | |
546 | for (mask = (1 << i); i >= 0; i--, mask >>= 1) { | |
547 | if (rate_mask & mask) { | |
548 | low = i; | |
549 | break; | |
550 | } | |
551 | } | |
552 | ||
553 | /* Find the next rate that is in the rate mask */ | |
554 | i = index + 1; | |
d9829a67 SO |
555 | for (mask = (1 << i); i < IWL_RATE_COUNT_3945; |
556 | i++, mask <<= 1) { | |
b481de9c ZY |
557 | if (rate_mask & mask) { |
558 | high = i; | |
559 | break; | |
560 | } | |
561 | } | |
562 | ||
563 | return (high << 8) | low; | |
564 | } | |
565 | ||
566 | low = index; | |
567 | while (low != IWL_RATE_INVALID) { | |
fa254a68 | 568 | if (rs_sta->tgg) |
bb8c093b | 569 | low = iwl3945_rates[low].prev_rs_tgg; |
b481de9c | 570 | else |
bb8c093b | 571 | low = iwl3945_rates[low].prev_rs; |
b481de9c ZY |
572 | if (low == IWL_RATE_INVALID) |
573 | break; | |
574 | if (rate_mask & (1 << low)) | |
575 | break; | |
e1623446 | 576 | IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low); |
b481de9c ZY |
577 | } |
578 | ||
579 | high = index; | |
580 | while (high != IWL_RATE_INVALID) { | |
fa254a68 | 581 | if (rs_sta->tgg) |
bb8c093b | 582 | high = iwl3945_rates[high].next_rs_tgg; |
b481de9c | 583 | else |
bb8c093b | 584 | high = iwl3945_rates[high].next_rs; |
b481de9c ZY |
585 | if (high == IWL_RATE_INVALID) |
586 | break; | |
587 | if (rate_mask & (1 << high)) | |
588 | break; | |
e1623446 | 589 | IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high); |
b481de9c ZY |
590 | } |
591 | ||
592 | return (high << 8) | low; | |
593 | } | |
594 | ||
595 | /** | |
596 | * rs_get_rate - find the rate for the requested packet | |
597 | * | |
598 | * Returns the ieee80211_rate structure allocated by the driver. | |
599 | * | |
600 | * The rate control algorithm has no internal mapping between hw_mode's | |
601 | * rate ordering and the rate ordering used by the rate control algorithm. | |
602 | * | |
603 | * The rate control algorithm uses a single table of rates that goes across | |
604 | * the entire A/B/G spectrum vs. being limited to just one particular | |
605 | * hw_mode. | |
606 | * | |
607 | * As such, we can't convert the index obtained below into the hw_mode's | |
608 | * rate table and must reference the driver allocated rate table | |
609 | * | |
610 | */ | |
e6a9854b JB |
611 | static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, |
612 | void *priv_sta, struct ieee80211_tx_rate_control *txrc) | |
b481de9c | 613 | { |
e6a9854b JB |
614 | struct ieee80211_supported_band *sband = txrc->sband; |
615 | struct sk_buff *skb = txrc->skb; | |
b481de9c ZY |
616 | u8 low = IWL_RATE_INVALID; |
617 | u8 high = IWL_RATE_INVALID; | |
618 | u16 high_low; | |
619 | int index; | |
4b7679a5 | 620 | struct iwl3945_rs_sta *rs_sta = priv_sta; |
bb8c093b | 621 | struct iwl3945_rate_scale_data *window = NULL; |
d9829a67 SO |
622 | int current_tpt = IWL_INVALID_VALUE; |
623 | int low_tpt = IWL_INVALID_VALUE; | |
624 | int high_tpt = IWL_INVALID_VALUE; | |
b481de9c ZY |
625 | u32 fail_count; |
626 | s8 scale_action = 0; | |
627 | unsigned long flags; | |
b481de9c | 628 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
0ab216d9 | 629 | u16 rate_mask = sta ? sta->supp_rates[sband->band] : 0; |
c6ec7a9b | 630 | s8 max_rate_idx = -1; |
4a8a4322 | 631 | struct iwl_priv *priv = (struct iwl_priv *)priv_r; |
e6a9854b | 632 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
b481de9c | 633 | |
e1623446 | 634 | IWL_DEBUG_RATE(priv, "enter\n"); |
b481de9c | 635 | |
4c6d4f5c | 636 | if (rate_control_send_low(sta, priv_sta, txrc)) |
1abbe498 | 637 | return; |
4c6d4f5c LR |
638 | |
639 | rate_mask = sta->supp_rates[sband->band]; | |
b481de9c | 640 | |
c6ec7a9b AM |
641 | /* get user max rate if set */ |
642 | max_rate_idx = txrc->max_rate_idx; | |
643 | if ((sband->band == IEEE80211_BAND_5GHZ) && (max_rate_idx != -1)) | |
644 | max_rate_idx += IWL_FIRST_OFDM_RATE; | |
645 | if ((max_rate_idx < 0) || (max_rate_idx >= IWL_RATE_COUNT)) | |
646 | max_rate_idx = -1; | |
647 | ||
d9829a67 | 648 | index = min(rs_sta->last_txrate_idx & 0xffff, IWL_RATE_COUNT_3945 - 1); |
14577f23 | 649 | |
28447f3c | 650 | if (sband->band == IEEE80211_BAND_5GHZ) |
14577f23 | 651 | rate_mask = rate_mask << IWL_FIRST_OFDM_RATE; |
b481de9c | 652 | |
05c914fe | 653 | if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) && |
fa254a68 | 654 | !rs_sta->ibss_sta_added) { |
c587de0b | 655 | u8 sta_id = iwl_find_station(priv, hdr->addr1); |
b481de9c ZY |
656 | |
657 | if (sta_id == IWL_INVALID_STATION) { | |
0358bc29 | 658 | IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", |
e174961c | 659 | hdr->addr1); |
c587de0b TW |
660 | sta_id = iwl_add_station(priv, hdr->addr1, false, |
661 | CMD_ASYNC, NULL); | |
b481de9c ZY |
662 | } |
663 | if (sta_id != IWL_INVALID_STATION) | |
fa254a68 | 664 | rs_sta->ibss_sta_added = 1; |
b481de9c ZY |
665 | } |
666 | ||
fa254a68 | 667 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 668 | |
74221d07 AM |
669 | /* for recent assoc, choose best rate regarding |
670 | * to rssi value | |
671 | */ | |
fa254a68 | 672 | if (rs_sta->start_rate != IWL_RATE_INVALID) { |
74221d07 AM |
673 | if (rs_sta->start_rate < index && |
674 | (rate_mask & (1 << rs_sta->start_rate))) | |
675 | index = rs_sta->start_rate; | |
fa254a68 | 676 | rs_sta->start_rate = IWL_RATE_INVALID; |
b481de9c ZY |
677 | } |
678 | ||
c6ec7a9b AM |
679 | /* force user max rate if set by user */ |
680 | if ((max_rate_idx != -1) && (max_rate_idx < index)) { | |
681 | if (rate_mask & (1 << max_rate_idx)) | |
682 | index = max_rate_idx; | |
683 | } | |
684 | ||
fa254a68 | 685 | window = &(rs_sta->win[index]); |
b481de9c ZY |
686 | |
687 | fail_count = window->counter - window->success_counter; | |
688 | ||
dd5b687e | 689 | if (((fail_count < IWL_RATE_MIN_FAILURE_TH) && |
b481de9c | 690 | (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))) { |
fa254a68 | 691 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c | 692 | |
e1623446 | 693 | IWL_DEBUG_RATE(priv, "Invalid average_tpt on rate %d: " |
b481de9c ZY |
694 | "counter: %d, success_counter: %d, " |
695 | "expected_tpt is %sNULL\n", | |
696 | index, | |
697 | window->counter, | |
698 | window->success_counter, | |
fa254a68 | 699 | rs_sta->expected_tpt ? "not " : ""); |
dd5b687e AK |
700 | |
701 | /* Can't calculate this yet; not enough history */ | |
702 | window->average_tpt = IWL_INVALID_VALUE; | |
b481de9c ZY |
703 | goto out; |
704 | ||
705 | } | |
706 | ||
b481de9c ZY |
707 | current_tpt = window->average_tpt; |
708 | ||
fa254a68 | 709 | high_low = iwl3945_get_adjacent_rate(rs_sta, index, rate_mask, |
28447f3c | 710 | sband->band); |
b481de9c ZY |
711 | low = high_low & 0xff; |
712 | high = (high_low >> 8) & 0xff; | |
713 | ||
c6ec7a9b AM |
714 | /* If user set max rate, dont allow higher than user constrain */ |
715 | if ((max_rate_idx != -1) && (max_rate_idx < high)) | |
716 | high = IWL_RATE_INVALID; | |
717 | ||
dd5b687e | 718 | /* Collect Measured throughputs of adjacent rates */ |
b481de9c | 719 | if (low != IWL_RATE_INVALID) |
fa254a68 | 720 | low_tpt = rs_sta->win[low].average_tpt; |
b481de9c ZY |
721 | |
722 | if (high != IWL_RATE_INVALID) | |
fa254a68 | 723 | high_tpt = rs_sta->win[high].average_tpt; |
b481de9c | 724 | |
fa254a68 | 725 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c | 726 | |
dd5b687e | 727 | scale_action = 0; |
b481de9c | 728 | |
dd5b687e | 729 | /* Low success ratio , need to drop the rate */ |
b481de9c | 730 | if ((window->success_ratio < IWL_RATE_DECREASE_TH) || !current_tpt) { |
e1623446 | 731 | IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n"); |
b481de9c | 732 | scale_action = -1; |
dd5b687e AK |
733 | /* No throughput measured yet for adjacent rates, |
734 | * try increase */ | |
d9829a67 | 735 | } else if ((low_tpt == IWL_INVALID_VALUE) && |
dd5b687e AK |
736 | (high_tpt == IWL_INVALID_VALUE)) { |
737 | ||
82127493 | 738 | if (high != IWL_RATE_INVALID && window->success_ratio >= IWL_RATE_INCREASE_TH) |
dd5b687e AK |
739 | scale_action = 1; |
740 | else if (low != IWL_RATE_INVALID) | |
82127493 | 741 | scale_action = 0; |
dd5b687e AK |
742 | |
743 | /* Both adjacent throughputs are measured, but neither one has | |
744 | * better throughput; we're using the best rate, don't change | |
745 | * it! */ | |
746 | } else if ((low_tpt != IWL_INVALID_VALUE) && | |
d9829a67 | 747 | (high_tpt != IWL_INVALID_VALUE) && |
28447f3c | 748 | (low_tpt < current_tpt) && (high_tpt < current_tpt)) { |
dd5b687e | 749 | |
e1623446 | 750 | IWL_DEBUG_RATE(priv, "No action -- low [%d] & high [%d] < " |
b481de9c ZY |
751 | "current_tpt [%d]\n", |
752 | low_tpt, high_tpt, current_tpt); | |
753 | scale_action = 0; | |
dd5b687e AK |
754 | |
755 | /* At least one of the rates has better throughput */ | |
b481de9c | 756 | } else { |
d9829a67 | 757 | if (high_tpt != IWL_INVALID_VALUE) { |
dd5b687e AK |
758 | |
759 | /* High rate has better throughput, Increase | |
760 | * rate */ | |
761 | if (high_tpt > current_tpt && | |
762 | window->success_ratio >= IWL_RATE_INCREASE_TH) | |
b481de9c ZY |
763 | scale_action = 1; |
764 | else { | |
e1623446 TW |
765 | IWL_DEBUG_RATE(priv, |
766 | "decrease rate because of high tpt\n"); | |
82127493 | 767 | scale_action = 0; |
b481de9c | 768 | } |
d9829a67 | 769 | } else if (low_tpt != IWL_INVALID_VALUE) { |
b481de9c | 770 | if (low_tpt > current_tpt) { |
e1623446 TW |
771 | IWL_DEBUG_RATE(priv, |
772 | "decrease rate because of low tpt\n"); | |
b481de9c | 773 | scale_action = -1; |
82127493 | 774 | } else if (window->success_ratio >= IWL_RATE_INCREASE_TH) { |
dd5b687e AK |
775 | /* Lower rate has better |
776 | * throughput,decrease rate */ | |
b481de9c | 777 | scale_action = 1; |
dd5b687e | 778 | } |
b481de9c ZY |
779 | } |
780 | } | |
781 | ||
dd5b687e AK |
782 | /* Sanity check; asked for decrease, but success rate or throughput |
783 | * has been good at old rate. Don't change it. */ | |
784 | if ((scale_action == -1) && (low != IWL_RATE_INVALID) && | |
785 | ((window->success_ratio > IWL_RATE_HIGH_TH) || | |
786 | (current_tpt > (100 * rs_sta->expected_tpt[low])))) | |
787 | scale_action = 0; | |
b481de9c ZY |
788 | |
789 | switch (scale_action) { | |
790 | case -1: | |
dd5b687e AK |
791 | |
792 | /* Decrese rate */ | |
b481de9c ZY |
793 | if (low != IWL_RATE_INVALID) |
794 | index = low; | |
795 | break; | |
796 | ||
797 | case 1: | |
dd5b687e | 798 | /* Increase rate */ |
b481de9c ZY |
799 | if (high != IWL_RATE_INVALID) |
800 | index = high; | |
801 | ||
802 | break; | |
803 | ||
804 | case 0: | |
805 | default: | |
dd5b687e | 806 | /* No change */ |
b481de9c ZY |
807 | break; |
808 | } | |
809 | ||
e1623446 | 810 | IWL_DEBUG_RATE(priv, "Selected %d (action %d) - low %d high %d\n", |
b481de9c ZY |
811 | index, scale_action, low, high); |
812 | ||
813 | out: | |
814 | ||
b7e35008 | 815 | rs_sta->last_txrate_idx = index; |
28447f3c | 816 | if (sband->band == IEEE80211_BAND_5GHZ) |
e6a9854b JB |
817 | info->control.rates[0].idx = rs_sta->last_txrate_idx - |
818 | IWL_FIRST_OFDM_RATE; | |
14577f23 | 819 | else |
e6a9854b | 820 | info->control.rates[0].idx = rs_sta->last_txrate_idx; |
14577f23 | 821 | |
e1623446 | 822 | IWL_DEBUG_RATE(priv, "leave: %d\n", index); |
b481de9c ZY |
823 | } |
824 | ||
c30e30e1 AM |
825 | #ifdef CONFIG_MAC80211_DEBUGFS |
826 | static int iwl3945_open_file_generic(struct inode *inode, struct file *file) | |
827 | { | |
828 | file->private_data = inode->i_private; | |
829 | return 0; | |
830 | } | |
831 | ||
832 | static ssize_t iwl3945_sta_dbgfs_stats_table_read(struct file *file, | |
833 | char __user *user_buf, | |
834 | size_t count, loff_t *ppos) | |
835 | { | |
a412c804 | 836 | char *buff; |
c30e30e1 AM |
837 | int desc = 0; |
838 | int j; | |
a412c804 | 839 | ssize_t ret; |
c30e30e1 AM |
840 | struct iwl3945_rs_sta *lq_sta = file->private_data; |
841 | ||
a412c804 FS |
842 | buff = kmalloc(1024, GFP_KERNEL); |
843 | if (!buff) | |
844 | return -ENOMEM; | |
845 | ||
c30e30e1 AM |
846 | desc += sprintf(buff + desc, "tx packets=%d last rate index=%d\n" |
847 | "rate=0x%X flush time %d\n", | |
848 | lq_sta->tx_packets, | |
849 | lq_sta->last_txrate_idx, | |
850 | lq_sta->start_rate, jiffies_to_msecs(lq_sta->flush_time)); | |
d9829a67 | 851 | for (j = 0; j < IWL_RATE_COUNT_3945; j++) { |
c30e30e1 AM |
852 | desc += sprintf(buff+desc, |
853 | "counter=%d success=%d %%=%d\n", | |
854 | lq_sta->win[j].counter, | |
855 | lq_sta->win[j].success_counter, | |
856 | lq_sta->win[j].success_ratio); | |
857 | } | |
a412c804 FS |
858 | ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); |
859 | kfree(buff); | |
860 | return ret; | |
c30e30e1 AM |
861 | } |
862 | ||
863 | static const struct file_operations rs_sta_dbgfs_stats_table_ops = { | |
864 | .read = iwl3945_sta_dbgfs_stats_table_read, | |
865 | .open = iwl3945_open_file_generic, | |
866 | }; | |
867 | ||
868 | static void iwl3945_add_debugfs(void *priv, void *priv_sta, | |
869 | struct dentry *dir) | |
870 | { | |
871 | struct iwl3945_rs_sta *lq_sta = priv_sta; | |
872 | ||
873 | lq_sta->rs_sta_dbgfs_stats_table_file = | |
874 | debugfs_create_file("rate_stats_table", 0600, dir, | |
875 | lq_sta, &rs_sta_dbgfs_stats_table_ops); | |
876 | ||
877 | } | |
878 | ||
879 | static void iwl3945_remove_debugfs(void *priv, void *priv_sta) | |
880 | { | |
881 | struct iwl3945_rs_sta *lq_sta = priv_sta; | |
882 | debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file); | |
883 | } | |
884 | #endif | |
885 | ||
b481de9c ZY |
886 | static struct rate_control_ops rs_ops = { |
887 | .module = NULL, | |
888 | .name = RS_NAME, | |
889 | .tx_status = rs_tx_status, | |
890 | .get_rate = rs_get_rate, | |
891 | .rate_init = rs_rate_init, | |
b481de9c ZY |
892 | .alloc = rs_alloc, |
893 | .free = rs_free, | |
894 | .alloc_sta = rs_alloc_sta, | |
895 | .free_sta = rs_free_sta, | |
c30e30e1 AM |
896 | #ifdef CONFIG_MAC80211_DEBUGFS |
897 | .add_sta_debugfs = iwl3945_add_debugfs, | |
898 | .remove_sta_debugfs = iwl3945_remove_debugfs, | |
899 | #endif | |
900 | ||
b481de9c ZY |
901 | }; |
902 | ||
bb8c093b | 903 | void iwl3945_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id) |
b481de9c | 904 | { |
4a8a4322 | 905 | struct iwl_priv *priv = hw->priv; |
b481de9c ZY |
906 | s32 rssi = 0; |
907 | unsigned long flags; | |
fa254a68 | 908 | struct iwl3945_rs_sta *rs_sta; |
4b7679a5 JB |
909 | struct ieee80211_sta *sta; |
910 | struct iwl3945_sta_priv *psta; | |
b481de9c | 911 | |
e1623446 | 912 | IWL_DEBUG_RATE(priv, "enter\n"); |
b481de9c | 913 | |
d0709a65 JB |
914 | rcu_read_lock(); |
915 | ||
5ed176e1 JB |
916 | sta = ieee80211_find_sta(priv->vif, |
917 | priv->stations[sta_id].sta.sta.addr); | |
52518189 | 918 | if (!sta) { |
d0709a65 | 919 | rcu_read_unlock(); |
b481de9c ZY |
920 | return; |
921 | } | |
922 | ||
52518189 | 923 | psta = (void *) sta->drv_priv; |
62a94926 | 924 | rs_sta = &psta->rs_sta; |
b481de9c | 925 | |
fa254a68 | 926 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 927 | |
fa254a68 | 928 | rs_sta->tgg = 0; |
8318d78a JB |
929 | switch (priv->band) { |
930 | case IEEE80211_BAND_2GHZ: | |
931 | /* TODO: this always does G, not a regression */ | |
8ccde88a | 932 | if (priv->active_rxon.flags & RXON_FLG_TGG_PROTECT_MSK) { |
fa254a68 TW |
933 | rs_sta->tgg = 1; |
934 | rs_sta->expected_tpt = iwl3945_expected_tpt_g_prot; | |
b481de9c | 935 | } else |
fa254a68 | 936 | rs_sta->expected_tpt = iwl3945_expected_tpt_g; |
b481de9c ZY |
937 | break; |
938 | ||
8318d78a | 939 | case IEEE80211_BAND_5GHZ: |
fa254a68 | 940 | rs_sta->expected_tpt = iwl3945_expected_tpt_a; |
b481de9c | 941 | break; |
8318d78a JB |
942 | case IEEE80211_NUM_BANDS: |
943 | BUG(); | |
b481de9c ZY |
944 | break; |
945 | } | |
946 | ||
fa254a68 | 947 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c ZY |
948 | |
949 | rssi = priv->last_rx_rssi; | |
950 | if (rssi == 0) | |
951 | rssi = IWL_MIN_RSSI_VAL; | |
952 | ||
e1623446 | 953 | IWL_DEBUG_RATE(priv, "Network RSSI: %d\n", rssi); |
b481de9c | 954 | |
8318d78a | 955 | rs_sta->start_rate = iwl3945_get_rate_index_by_rssi(rssi, priv->band); |
b481de9c | 956 | |
e1623446 | 957 | IWL_DEBUG_RATE(priv, "leave: rssi %d assign rate index: " |
fa254a68 TW |
958 | "%d (plcp 0x%x)\n", rssi, rs_sta->start_rate, |
959 | iwl3945_rates[rs_sta->start_rate].plcp); | |
52518189 | 960 | rcu_read_unlock(); |
b481de9c ZY |
961 | } |
962 | ||
897e1cf2 | 963 | int iwl3945_rate_control_register(void) |
b481de9c | 964 | { |
897e1cf2 | 965 | return ieee80211_rate_control_register(&rs_ops); |
b481de9c ZY |
966 | } |
967 | ||
897e1cf2 | 968 | void iwl3945_rate_control_unregister(void) |
b481de9c ZY |
969 | { |
970 | ieee80211_rate_control_unregister(&rs_ops); | |
971 | } | |
972 | ||
973 |