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> | |
5a0e3ad6 | 30 | #include <linux/slab.h> |
b481de9c ZY |
31 | #include <linux/wireless.h> |
32 | #include <net/mac80211.h> | |
b481de9c ZY |
33 | |
34 | #include <linux/netdevice.h> | |
35 | #include <linux/etherdevice.h> | |
36 | #include <linux/delay.h> | |
37 | ||
38 | #include <linux/workqueue.h> | |
39 | ||
600c0e11 | 40 | #include "iwl-commands.h" |
5d08cd1d | 41 | #include "iwl-3945.h" |
c587de0b | 42 | #include "iwl-sta.h" |
b481de9c ZY |
43 | |
44 | #define RS_NAME "iwl-3945-rs" | |
45 | ||
d9829a67 | 46 | static s32 iwl3945_expected_tpt_g[IWL_RATE_COUNT_3945] = { |
14577f23 | 47 | 7, 13, 35, 58, 0, 0, 76, 104, 130, 168, 191, 202 |
b481de9c ZY |
48 | }; |
49 | ||
d9829a67 | 50 | static s32 iwl3945_expected_tpt_g_prot[IWL_RATE_COUNT_3945] = { |
14577f23 | 51 | 7, 13, 35, 58, 0, 0, 0, 80, 93, 113, 123, 125 |
b481de9c ZY |
52 | }; |
53 | ||
d9829a67 | 54 | static s32 iwl3945_expected_tpt_a[IWL_RATE_COUNT_3945] = { |
14577f23 | 55 | 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186 |
b481de9c ZY |
56 | }; |
57 | ||
d9829a67 | 58 | static s32 iwl3945_expected_tpt_b[IWL_RATE_COUNT_3945] = { |
14577f23 | 59 | 7, 13, 35, 58, 0, 0, 0, 0, 0, 0, 0, 0 |
b481de9c ZY |
60 | }; |
61 | ||
bb8c093b | 62 | struct iwl3945_tpt_entry { |
b481de9c ZY |
63 | s8 min_rssi; |
64 | u8 index; | |
65 | }; | |
66 | ||
bb8c093b | 67 | static struct iwl3945_tpt_entry iwl3945_tpt_table_a[] = { |
b481de9c ZY |
68 | {-60, IWL_RATE_54M_INDEX}, |
69 | {-64, IWL_RATE_48M_INDEX}, | |
70 | {-72, IWL_RATE_36M_INDEX}, | |
71 | {-80, IWL_RATE_24M_INDEX}, | |
72 | {-84, IWL_RATE_18M_INDEX}, | |
73 | {-85, IWL_RATE_12M_INDEX}, | |
74 | {-87, IWL_RATE_9M_INDEX}, | |
75 | {-89, IWL_RATE_6M_INDEX} | |
76 | }; | |
77 | ||
bb8c093b | 78 | static struct iwl3945_tpt_entry iwl3945_tpt_table_g[] = { |
b481de9c ZY |
79 | {-60, IWL_RATE_54M_INDEX}, |
80 | {-64, IWL_RATE_48M_INDEX}, | |
81 | {-68, IWL_RATE_36M_INDEX}, | |
82 | {-80, IWL_RATE_24M_INDEX}, | |
83 | {-84, IWL_RATE_18M_INDEX}, | |
84 | {-85, IWL_RATE_12M_INDEX}, | |
85 | {-86, IWL_RATE_11M_INDEX}, | |
86 | {-88, IWL_RATE_5M_INDEX}, | |
87 | {-90, IWL_RATE_2M_INDEX}, | |
88 | {-92, IWL_RATE_1M_INDEX} | |
89 | }; | |
90 | ||
91 | #define IWL_RATE_MAX_WINDOW 62 | |
74221d07 | 92 | #define IWL_RATE_FLUSH (3*HZ) |
b481de9c | 93 | #define IWL_RATE_WIN_FLUSH (HZ/2) |
d9829a67 | 94 | #define IWL39_RATE_HIGH_TH 11520 |
74221d07 AM |
95 | #define IWL_SUCCESS_UP_TH 8960 |
96 | #define IWL_SUCCESS_DOWN_TH 10880 | |
82127493 | 97 | #define IWL_RATE_MIN_FAILURE_TH 6 |
b481de9c ZY |
98 | #define IWL_RATE_MIN_SUCCESS_TH 8 |
99 | #define IWL_RATE_DECREASE_TH 1920 | |
dd5b687e | 100 | #define IWL_RATE_RETRY_TH 15 |
b481de9c | 101 | |
8318d78a | 102 | static u8 iwl3945_get_rate_index_by_rssi(s32 rssi, enum ieee80211_band band) |
b481de9c ZY |
103 | { |
104 | u32 index = 0; | |
105 | u32 table_size = 0; | |
bb8c093b | 106 | struct iwl3945_tpt_entry *tpt_table = NULL; |
b481de9c ZY |
107 | |
108 | if ((rssi < IWL_MIN_RSSI_VAL) || (rssi > IWL_MAX_RSSI_VAL)) | |
109 | rssi = IWL_MIN_RSSI_VAL; | |
110 | ||
8318d78a JB |
111 | switch (band) { |
112 | case IEEE80211_BAND_2GHZ: | |
bb8c093b CH |
113 | tpt_table = iwl3945_tpt_table_g; |
114 | table_size = ARRAY_SIZE(iwl3945_tpt_table_g); | |
b481de9c ZY |
115 | break; |
116 | ||
8318d78a | 117 | case IEEE80211_BAND_5GHZ: |
bb8c093b CH |
118 | tpt_table = iwl3945_tpt_table_a; |
119 | table_size = ARRAY_SIZE(iwl3945_tpt_table_a); | |
b481de9c ZY |
120 | break; |
121 | ||
122 | default: | |
8318d78a | 123 | BUG(); |
b481de9c ZY |
124 | break; |
125 | } | |
126 | ||
127 | while ((index < table_size) && (rssi < tpt_table[index].min_rssi)) | |
128 | index++; | |
129 | ||
130 | index = min(index, (table_size - 1)); | |
131 | ||
132 | return tpt_table[index].index; | |
133 | } | |
134 | ||
bb8c093b | 135 | static void iwl3945_clear_window(struct iwl3945_rate_scale_data *window) |
b481de9c ZY |
136 | { |
137 | window->data = 0; | |
138 | window->success_counter = 0; | |
28447f3c | 139 | window->success_ratio = -1; |
b481de9c | 140 | window->counter = 0; |
d9829a67 | 141 | window->average_tpt = IWL_INVALID_VALUE; |
b481de9c ZY |
142 | window->stamp = 0; |
143 | } | |
144 | ||
145 | /** | |
bb8c093b | 146 | * iwl3945_rate_scale_flush_windows - flush out the rate scale windows |
b481de9c ZY |
147 | * |
148 | * Returns the number of windows that have gathered data but were | |
149 | * not flushed. If there were any that were not flushed, then | |
150 | * reschedule the rate flushing routine. | |
151 | */ | |
fa254a68 | 152 | static int iwl3945_rate_scale_flush_windows(struct iwl3945_rs_sta *rs_sta) |
b481de9c ZY |
153 | { |
154 | int unflushed = 0; | |
155 | int i; | |
156 | unsigned long flags; | |
7530f85f | 157 | struct iwl_priv *priv __maybe_unused = rs_sta->priv; |
b481de9c ZY |
158 | |
159 | /* | |
160 | * For each rate, if we have collected data on that rate | |
161 | * and it has been more than IWL_RATE_WIN_FLUSH | |
162 | * since we flushed, clear out the gathered statistics | |
163 | */ | |
d9829a67 | 164 | for (i = 0; i < IWL_RATE_COUNT_3945; i++) { |
fa254a68 | 165 | if (!rs_sta->win[i].counter) |
b481de9c ZY |
166 | continue; |
167 | ||
fa254a68 TW |
168 | spin_lock_irqsave(&rs_sta->lock, flags); |
169 | if (time_after(jiffies, rs_sta->win[i].stamp + | |
b481de9c | 170 | IWL_RATE_WIN_FLUSH)) { |
e1623446 | 171 | IWL_DEBUG_RATE(priv, "flushing %d samples of rate " |
b481de9c | 172 | "index %d\n", |
fa254a68 TW |
173 | rs_sta->win[i].counter, i); |
174 | iwl3945_clear_window(&rs_sta->win[i]); | |
b481de9c ZY |
175 | } else |
176 | unflushed++; | |
fa254a68 | 177 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c ZY |
178 | } |
179 | ||
180 | return unflushed; | |
181 | } | |
182 | ||
183 | #define IWL_RATE_FLUSH_MAX 5000 /* msec */ | |
184 | #define IWL_RATE_FLUSH_MIN 50 /* msec */ | |
74221d07 | 185 | #define IWL_AVERAGE_PACKETS 1500 |
b481de9c | 186 | |
bb8c093b | 187 | static void iwl3945_bg_rate_scale_flush(unsigned long data) |
b481de9c | 188 | { |
fa254a68 | 189 | struct iwl3945_rs_sta *rs_sta = (void *)data; |
7530f85f | 190 | struct iwl_priv *priv __maybe_unused = rs_sta->priv; |
b481de9c ZY |
191 | int unflushed = 0; |
192 | unsigned long flags; | |
193 | u32 packet_count, duration, pps; | |
194 | ||
e1623446 | 195 | IWL_DEBUG_RATE(priv, "enter\n"); |
b481de9c | 196 | |
fa254a68 | 197 | unflushed = iwl3945_rate_scale_flush_windows(rs_sta); |
b481de9c | 198 | |
fa254a68 | 199 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 200 | |
b481de9c | 201 | /* Number of packets Rx'd since last time this timer ran */ |
fa254a68 | 202 | packet_count = (rs_sta->tx_packets - rs_sta->last_tx_packets) + 1; |
b481de9c | 203 | |
fa254a68 | 204 | rs_sta->last_tx_packets = rs_sta->tx_packets + 1; |
b481de9c ZY |
205 | |
206 | if (unflushed) { | |
207 | duration = | |
fa254a68 | 208 | jiffies_to_msecs(jiffies - rs_sta->last_partial_flush); |
b481de9c | 209 | |
e1623446 | 210 | IWL_DEBUG_RATE(priv, "Tx'd %d packets in %dms\n", |
b481de9c ZY |
211 | packet_count, duration); |
212 | ||
213 | /* Determine packets per second */ | |
214 | if (duration) | |
215 | pps = (packet_count * 1000) / duration; | |
216 | else | |
217 | pps = 0; | |
218 | ||
219 | if (pps) { | |
74221d07 | 220 | duration = (IWL_AVERAGE_PACKETS * 1000) / pps; |
b481de9c ZY |
221 | if (duration < IWL_RATE_FLUSH_MIN) |
222 | duration = IWL_RATE_FLUSH_MIN; | |
74221d07 AM |
223 | else if (duration > IWL_RATE_FLUSH_MAX) |
224 | duration = IWL_RATE_FLUSH_MAX; | |
b481de9c ZY |
225 | } else |
226 | duration = IWL_RATE_FLUSH_MAX; | |
227 | ||
fa254a68 | 228 | rs_sta->flush_time = msecs_to_jiffies(duration); |
b481de9c | 229 | |
e1623446 | 230 | IWL_DEBUG_RATE(priv, "new flush period: %d msec ave %d\n", |
b481de9c ZY |
231 | duration, packet_count); |
232 | ||
fa254a68 TW |
233 | mod_timer(&rs_sta->rate_scale_flush, jiffies + |
234 | rs_sta->flush_time); | |
b481de9c | 235 | |
fa254a68 | 236 | rs_sta->last_partial_flush = jiffies; |
74221d07 AM |
237 | } else { |
238 | rs_sta->flush_time = IWL_RATE_FLUSH; | |
239 | rs_sta->flush_pending = 0; | |
b481de9c | 240 | } |
b481de9c ZY |
241 | /* If there weren't any unflushed entries, we don't schedule the timer |
242 | * to run again */ | |
243 | ||
fa254a68 | 244 | rs_sta->last_flush = jiffies; |
b481de9c | 245 | |
fa254a68 | 246 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c | 247 | |
e1623446 | 248 | IWL_DEBUG_RATE(priv, "leave\n"); |
b481de9c ZY |
249 | } |
250 | ||
251 | /** | |
bb8c093b | 252 | * iwl3945_collect_tx_data - Update the success/failure sliding window |
b481de9c ZY |
253 | * |
254 | * We keep a sliding window of the last 64 packets transmitted | |
255 | * at this rate. window->data contains the bitmask of successful | |
256 | * packets. | |
257 | */ | |
fa254a68 | 258 | static void iwl3945_collect_tx_data(struct iwl3945_rs_sta *rs_sta, |
bb8c093b | 259 | struct iwl3945_rate_scale_data *window, |
74221d07 | 260 | int success, int retries, int index) |
b481de9c ZY |
261 | { |
262 | unsigned long flags; | |
74221d07 | 263 | s32 fail_count; |
7530f85f | 264 | struct iwl_priv *priv __maybe_unused = rs_sta->priv; |
b481de9c ZY |
265 | |
266 | if (!retries) { | |
e1623446 | 267 | IWL_DEBUG_RATE(priv, "leave: retries == 0 -- should be at least 1\n"); |
b481de9c ZY |
268 | return; |
269 | } | |
270 | ||
74221d07 | 271 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 272 | |
dd5b687e AK |
273 | /* |
274 | * Keep track of only the latest 62 tx frame attempts in this rate's | |
275 | * history window; anything older isn't really relevant any more. | |
276 | * If we have filled up the sliding window, drop the oldest attempt; | |
277 | * if the oldest attempt (highest bit in bitmap) shows "success", | |
278 | * subtract "1" from the success counter (this is the main reason | |
279 | * we keep these bitmaps!). | |
280 | * */ | |
281 | while (retries > 0) { | |
282 | if (window->counter >= IWL_RATE_MAX_WINDOW) { | |
283 | ||
284 | /* remove earliest */ | |
285 | window->counter = IWL_RATE_MAX_WINDOW - 1; | |
286 | ||
287 | if (window->data & (1ULL << (IWL_RATE_MAX_WINDOW - 1))) { | |
288 | window->data &= ~(1ULL << (IWL_RATE_MAX_WINDOW - 1)); | |
b481de9c | 289 | window->success_counter--; |
dd5b687e AK |
290 | } |
291 | } | |
b481de9c | 292 | |
dd5b687e AK |
293 | /* Increment frames-attempted counter */ |
294 | window->counter++; | |
b481de9c | 295 | |
dd5b687e AK |
296 | /* Shift bitmap by one frame (throw away oldest history), |
297 | * OR in "1", and increment "success" if this | |
298 | * frame was successful. */ | |
299 | window->data <<= 1; | |
300 | if (success > 0) { | |
b481de9c | 301 | window->success_counter++; |
dd5b687e AK |
302 | window->data |= 0x1; |
303 | success--; | |
b481de9c ZY |
304 | } |
305 | ||
dd5b687e | 306 | retries--; |
b481de9c | 307 | } |
74221d07 | 308 | |
dd5b687e AK |
309 | /* Calculate current success ratio, avoid divide-by-0! */ |
310 | if (window->counter > 0) | |
311 | window->success_ratio = 128 * (100 * window->success_counter) | |
312 | / window->counter; | |
313 | else | |
314 | window->success_ratio = IWL_INVALID_VALUE; | |
315 | ||
74221d07 | 316 | fail_count = window->counter - window->success_counter; |
dd5b687e AK |
317 | |
318 | /* Calculate average throughput, if we have enough history. */ | |
74221d07 AM |
319 | if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) || |
320 | (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH)) | |
321 | window->average_tpt = ((window->success_ratio * | |
322 | rs_sta->expected_tpt[index] + 64) / 128); | |
323 | else | |
d9829a67 | 324 | window->average_tpt = IWL_INVALID_VALUE; |
74221d07 | 325 | |
dd5b687e AK |
326 | /* Tag this window as having been updated */ |
327 | window->stamp = jiffies; | |
328 | ||
74221d07 AM |
329 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
330 | ||
b481de9c ZY |
331 | } |
332 | ||
7262796a | 333 | static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband, |
4b7679a5 | 334 | struct ieee80211_sta *sta, void *priv_sta) |
b481de9c | 335 | { |
4b7679a5 | 336 | struct iwl3945_rs_sta *rs_sta = priv_sta; |
4a8a4322 | 337 | struct iwl_priv *priv = (struct iwl_priv *)priv_r; |
b481de9c ZY |
338 | int i; |
339 | ||
e1623446 | 340 | IWL_DEBUG_RATE(priv, "enter\n"); |
b481de9c | 341 | |
62a94926 RC |
342 | spin_lock_init(&rs_sta->lock); |
343 | ||
344 | rs_sta->priv = priv; | |
345 | ||
346 | rs_sta->start_rate = IWL_RATE_INVALID; | |
347 | ||
348 | /* default to just 802.11b */ | |
349 | rs_sta->expected_tpt = iwl3945_expected_tpt_b; | |
350 | ||
351 | rs_sta->last_partial_flush = jiffies; | |
352 | rs_sta->last_flush = jiffies; | |
353 | rs_sta->flush_time = IWL_RATE_FLUSH; | |
354 | rs_sta->last_tx_packets = 0; | |
355 | rs_sta->ibss_sta_added = 0; | |
356 | ||
357 | init_timer(&rs_sta->rate_scale_flush); | |
358 | rs_sta->rate_scale_flush.data = (unsigned long)rs_sta; | |
d20a80f0 | 359 | rs_sta->rate_scale_flush.function = iwl3945_bg_rate_scale_flush; |
62a94926 RC |
360 | |
361 | for (i = 0; i < IWL_RATE_COUNT_3945; i++) | |
362 | iwl3945_clear_window(&rs_sta->win[i]); | |
363 | ||
b481de9c ZY |
364 | /* TODO: what is a good starting rate for STA? About middle? Maybe not |
365 | * the lowest or the highest rate.. Could consider using RSSI from | |
366 | * previous packets? Need to have IEEE 802.1X auth succeed immediately | |
367 | * after assoc.. */ | |
368 | ||
7262796a | 369 | for (i = sband->n_bitrates - 1; i >= 0; i--) { |
4b7679a5 | 370 | if (sta->supp_rates[sband->band] & (1 << i)) { |
ae17e986 | 371 | rs_sta->last_txrate_idx = i; |
b481de9c ZY |
372 | break; |
373 | } | |
374 | } | |
375 | ||
7262796a | 376 | priv->sta_supp_rates = sta->supp_rates[sband->band]; |
8318d78a | 377 | /* For 5 GHz band it start at IWL_FIRST_OFDM_RATE */ |
7262796a | 378 | if (sband->band == IEEE80211_BAND_5GHZ) { |
b7e35008 | 379 | rs_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE; |
7262796a AM |
380 | priv->sta_supp_rates = priv->sta_supp_rates << |
381 | IWL_FIRST_OFDM_RATE; | |
382 | } | |
383 | ||
14577f23 | 384 | |
e1623446 | 385 | IWL_DEBUG_RATE(priv, "leave\n"); |
b481de9c ZY |
386 | } |
387 | ||
4b7679a5 | 388 | static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) |
b481de9c | 389 | { |
4b7679a5 | 390 | return hw->priv; |
b481de9c ZY |
391 | } |
392 | ||
01ebd063 | 393 | /* rate scale requires free function to be implemented */ |
b481de9c ZY |
394 | static void rs_free(void *priv) |
395 | { | |
396 | return; | |
397 | } | |
4b7679a5 | 398 | |
40b8ec0b | 399 | static void *rs_alloc_sta(void *iwl_priv, struct ieee80211_sta *sta, gfp_t gfp) |
b481de9c | 400 | { |
fa254a68 | 401 | struct iwl3945_rs_sta *rs_sta; |
4b7679a5 | 402 | struct iwl3945_sta_priv *psta = (void *) sta->drv_priv; |
62a94926 | 403 | struct iwl_priv *priv __maybe_unused = iwl_priv; |
4b7679a5 | 404 | |
e1623446 | 405 | IWL_DEBUG_RATE(priv, "enter\n"); |
b481de9c | 406 | |
62a94926 | 407 | rs_sta = &psta->rs_sta; |
b481de9c | 408 | |
e1623446 | 409 | IWL_DEBUG_RATE(priv, "leave\n"); |
b481de9c | 410 | |
fa254a68 | 411 | return rs_sta; |
b481de9c ZY |
412 | } |
413 | ||
40b8ec0b | 414 | static void rs_free_sta(void *iwl_priv, struct ieee80211_sta *sta, |
4b7679a5 | 415 | void *priv_sta) |
b481de9c | 416 | { |
4b7679a5 | 417 | struct iwl3945_sta_priv *psta = (void *) sta->drv_priv; |
62a94926 | 418 | struct iwl3945_rs_sta *rs_sta = &psta->rs_sta; |
7530f85f | 419 | struct iwl_priv *priv __maybe_unused = rs_sta->priv; |
b481de9c | 420 | |
e1623446 | 421 | IWL_DEBUG_RATE(priv, "enter\n"); |
fa254a68 | 422 | del_timer_sync(&rs_sta->rate_scale_flush); |
e1623446 | 423 | IWL_DEBUG_RATE(priv, "leave\n"); |
b481de9c ZY |
424 | } |
425 | ||
14577f23 | 426 | |
b481de9c ZY |
427 | /** |
428 | * rs_tx_status - Update rate control values based on Tx results | |
429 | * | |
4a8a4322 | 430 | * NOTE: Uses iwl_priv->retry_rate for the # of retries attempted by |
b481de9c ZY |
431 | * the hardware for each rate. |
432 | */ | |
4b7679a5 JB |
433 | static void rs_tx_status(void *priv_rate, struct ieee80211_supported_band *sband, |
434 | struct ieee80211_sta *sta, void *priv_sta, | |
e039fa4a | 435 | struct sk_buff *skb) |
b481de9c | 436 | { |
74221d07 | 437 | s8 retries = 0, current_count; |
b481de9c ZY |
438 | int scale_rate_index, first_index, last_index; |
439 | unsigned long flags; | |
4a8a4322 | 440 | struct iwl_priv *priv = (struct iwl_priv *)priv_rate; |
4b7679a5 | 441 | struct iwl3945_rs_sta *rs_sta = priv_sta; |
e039fa4a | 442 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
8318d78a | 443 | |
e1623446 | 444 | IWL_DEBUG_RATE(priv, "enter\n"); |
28447f3c | 445 | |
82127493 | 446 | retries = info->status.rates[0].count; |
dd5b687e AK |
447 | /* Sanity Check for retries */ |
448 | if (retries > IWL_RATE_RETRY_TH) | |
449 | retries = IWL_RATE_RETRY_TH; | |
e6a9854b JB |
450 | |
451 | first_index = sband->bitrates[info->status.rates[0].idx].hw_value; | |
d9829a67 | 452 | if ((first_index < 0) || (first_index >= IWL_RATE_COUNT_3945)) { |
e1623446 | 453 | IWL_DEBUG_RATE(priv, "leave: Rate out of bounds: %d\n", first_index); |
b481de9c ZY |
454 | return; |
455 | } | |
456 | ||
4b7679a5 | 457 | if (!priv_sta) { |
e1623446 | 458 | IWL_DEBUG_RATE(priv, "leave: No STA priv data to update!\n"); |
b481de9c ZY |
459 | return; |
460 | } | |
461 | ||
fa254a68 | 462 | rs_sta->tx_packets++; |
b481de9c ZY |
463 | |
464 | scale_rate_index = first_index; | |
465 | last_index = first_index; | |
466 | ||
467 | /* | |
468 | * Update the window for each rate. We determine which rates | |
469 | * were Tx'd based on the total number of retries vs. the number | |
470 | * of retries configured for each rate -- currently set to the | |
471 | * priv value 'retry_rate' vs. rate specific | |
472 | * | |
473 | * On exit from this while loop last_index indicates the rate | |
474 | * at which the frame was finally transmitted (or failed if no | |
475 | * ACK) | |
476 | */ | |
74221d07 AM |
477 | while (retries > 1) { |
478 | if ((retries - 1) < priv->retry_rate) { | |
479 | current_count = (retries - 1); | |
b481de9c ZY |
480 | last_index = scale_rate_index; |
481 | } else { | |
482 | current_count = priv->retry_rate; | |
e6a9854b | 483 | last_index = iwl3945_rs_next_rate(priv, |
14577f23 | 484 | scale_rate_index); |
b481de9c ZY |
485 | } |
486 | ||
487 | /* Update this rate accounting for as many retries | |
488 | * as was used for it (per current_count) */ | |
fa254a68 TW |
489 | iwl3945_collect_tx_data(rs_sta, |
490 | &rs_sta->win[scale_rate_index], | |
74221d07 | 491 | 0, current_count, scale_rate_index); |
e1623446 | 492 | IWL_DEBUG_RATE(priv, "Update rate %d for %d retries.\n", |
b481de9c ZY |
493 | scale_rate_index, current_count); |
494 | ||
495 | retries -= current_count; | |
496 | ||
74221d07 | 497 | scale_rate_index = last_index; |
b481de9c ZY |
498 | } |
499 | ||
14577f23 | 500 | |
b481de9c | 501 | /* Update the last index window with success/failure based on ACK */ |
e1623446 | 502 | IWL_DEBUG_RATE(priv, "Update rate %d with %s.\n", |
b481de9c | 503 | last_index, |
e039fa4a | 504 | (info->flags & IEEE80211_TX_STAT_ACK) ? |
b481de9c | 505 | "success" : "failure"); |
fa254a68 TW |
506 | iwl3945_collect_tx_data(rs_sta, |
507 | &rs_sta->win[last_index], | |
74221d07 | 508 | info->flags & IEEE80211_TX_STAT_ACK, 1, last_index); |
b481de9c ZY |
509 | |
510 | /* We updated the rate scale window -- if its been more than | |
511 | * flush_time since the last run, schedule the flush | |
512 | * again */ | |
fa254a68 | 513 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 514 | |
fa254a68 | 515 | if (!rs_sta->flush_pending && |
74221d07 | 516 | time_after(jiffies, rs_sta->last_flush + |
fa254a68 | 517 | rs_sta->flush_time)) { |
b481de9c | 518 | |
74221d07 | 519 | rs_sta->last_partial_flush = jiffies; |
fa254a68 TW |
520 | rs_sta->flush_pending = 1; |
521 | mod_timer(&rs_sta->rate_scale_flush, | |
522 | jiffies + rs_sta->flush_time); | |
b481de9c ZY |
523 | } |
524 | ||
fa254a68 | 525 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c | 526 | |
e1623446 | 527 | IWL_DEBUG_RATE(priv, "leave\n"); |
b481de9c ZY |
528 | |
529 | return; | |
530 | } | |
531 | ||
fa254a68 | 532 | static u16 iwl3945_get_adjacent_rate(struct iwl3945_rs_sta *rs_sta, |
8318d78a | 533 | u8 index, u16 rate_mask, enum ieee80211_band band) |
b481de9c ZY |
534 | { |
535 | u8 high = IWL_RATE_INVALID; | |
536 | u8 low = IWL_RATE_INVALID; | |
7530f85f | 537 | struct iwl_priv *priv __maybe_unused = rs_sta->priv; |
b481de9c | 538 | |
01ebd063 | 539 | /* 802.11A walks to the next literal adjacent rate in |
b481de9c | 540 | * the rate table */ |
8318d78a | 541 | if (unlikely(band == IEEE80211_BAND_5GHZ)) { |
b481de9c ZY |
542 | int i; |
543 | u32 mask; | |
544 | ||
545 | /* Find the previous rate that is in the rate mask */ | |
546 | i = index - 1; | |
547 | for (mask = (1 << i); i >= 0; i--, mask >>= 1) { | |
548 | if (rate_mask & mask) { | |
549 | low = i; | |
550 | break; | |
551 | } | |
552 | } | |
553 | ||
554 | /* Find the next rate that is in the rate mask */ | |
555 | i = index + 1; | |
d9829a67 SO |
556 | for (mask = (1 << i); i < IWL_RATE_COUNT_3945; |
557 | i++, mask <<= 1) { | |
b481de9c ZY |
558 | if (rate_mask & mask) { |
559 | high = i; | |
560 | break; | |
561 | } | |
562 | } | |
563 | ||
564 | return (high << 8) | low; | |
565 | } | |
566 | ||
567 | low = index; | |
568 | while (low != IWL_RATE_INVALID) { | |
fa254a68 | 569 | if (rs_sta->tgg) |
bb8c093b | 570 | low = iwl3945_rates[low].prev_rs_tgg; |
b481de9c | 571 | else |
bb8c093b | 572 | low = iwl3945_rates[low].prev_rs; |
b481de9c ZY |
573 | if (low == IWL_RATE_INVALID) |
574 | break; | |
575 | if (rate_mask & (1 << low)) | |
576 | break; | |
e1623446 | 577 | IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low); |
b481de9c ZY |
578 | } |
579 | ||
580 | high = index; | |
581 | while (high != IWL_RATE_INVALID) { | |
fa254a68 | 582 | if (rs_sta->tgg) |
bb8c093b | 583 | high = iwl3945_rates[high].next_rs_tgg; |
b481de9c | 584 | else |
bb8c093b | 585 | high = iwl3945_rates[high].next_rs; |
b481de9c ZY |
586 | if (high == IWL_RATE_INVALID) |
587 | break; | |
588 | if (rate_mask & (1 << high)) | |
589 | break; | |
e1623446 | 590 | IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high); |
b481de9c ZY |
591 | } |
592 | ||
593 | return (high << 8) | low; | |
594 | } | |
595 | ||
596 | /** | |
597 | * rs_get_rate - find the rate for the requested packet | |
598 | * | |
599 | * Returns the ieee80211_rate structure allocated by the driver. | |
600 | * | |
601 | * The rate control algorithm has no internal mapping between hw_mode's | |
602 | * rate ordering and the rate ordering used by the rate control algorithm. | |
603 | * | |
604 | * The rate control algorithm uses a single table of rates that goes across | |
605 | * the entire A/B/G spectrum vs. being limited to just one particular | |
606 | * hw_mode. | |
607 | * | |
608 | * As such, we can't convert the index obtained below into the hw_mode's | |
609 | * rate table and must reference the driver allocated rate table | |
610 | * | |
611 | */ | |
e6a9854b JB |
612 | static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, |
613 | void *priv_sta, struct ieee80211_tx_rate_control *txrc) | |
b481de9c | 614 | { |
e6a9854b JB |
615 | struct ieee80211_supported_band *sband = txrc->sband; |
616 | struct sk_buff *skb = txrc->skb; | |
b481de9c ZY |
617 | u8 low = IWL_RATE_INVALID; |
618 | u8 high = IWL_RATE_INVALID; | |
619 | u16 high_low; | |
620 | int index; | |
4b7679a5 | 621 | struct iwl3945_rs_sta *rs_sta = priv_sta; |
bb8c093b | 622 | struct iwl3945_rate_scale_data *window = NULL; |
d9829a67 SO |
623 | int current_tpt = IWL_INVALID_VALUE; |
624 | int low_tpt = IWL_INVALID_VALUE; | |
625 | int high_tpt = IWL_INVALID_VALUE; | |
b481de9c ZY |
626 | u32 fail_count; |
627 | s8 scale_action = 0; | |
628 | unsigned long flags; | |
b481de9c | 629 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
0ab216d9 | 630 | u16 rate_mask = sta ? sta->supp_rates[sband->band] : 0; |
c6ec7a9b | 631 | s8 max_rate_idx = -1; |
4a8a4322 | 632 | struct iwl_priv *priv = (struct iwl_priv *)priv_r; |
e6a9854b | 633 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
b481de9c | 634 | |
e1623446 | 635 | IWL_DEBUG_RATE(priv, "enter\n"); |
b481de9c | 636 | |
4c6d4f5c | 637 | if (rate_control_send_low(sta, priv_sta, txrc)) |
1abbe498 | 638 | return; |
4c6d4f5c LR |
639 | |
640 | rate_mask = sta->supp_rates[sband->band]; | |
b481de9c | 641 | |
c6ec7a9b AM |
642 | /* get user max rate if set */ |
643 | max_rate_idx = txrc->max_rate_idx; | |
644 | if ((sband->band == IEEE80211_BAND_5GHZ) && (max_rate_idx != -1)) | |
645 | max_rate_idx += IWL_FIRST_OFDM_RATE; | |
646 | if ((max_rate_idx < 0) || (max_rate_idx >= IWL_RATE_COUNT)) | |
647 | max_rate_idx = -1; | |
648 | ||
d9829a67 | 649 | index = min(rs_sta->last_txrate_idx & 0xffff, IWL_RATE_COUNT_3945 - 1); |
14577f23 | 650 | |
28447f3c | 651 | if (sband->band == IEEE80211_BAND_5GHZ) |
14577f23 | 652 | rate_mask = rate_mask << IWL_FIRST_OFDM_RATE; |
b481de9c | 653 | |
05c914fe | 654 | if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) && |
fa254a68 | 655 | !rs_sta->ibss_sta_added) { |
c587de0b | 656 | u8 sta_id = iwl_find_station(priv, hdr->addr1); |
b481de9c ZY |
657 | |
658 | if (sta_id == IWL_INVALID_STATION) { | |
0358bc29 | 659 | IWL_DEBUG_RATE(priv, "LQ: ADD station %pM\n", |
e174961c | 660 | hdr->addr1); |
c587de0b TW |
661 | sta_id = iwl_add_station(priv, hdr->addr1, false, |
662 | CMD_ASYNC, NULL); | |
b481de9c ZY |
663 | } |
664 | if (sta_id != IWL_INVALID_STATION) | |
fa254a68 | 665 | rs_sta->ibss_sta_added = 1; |
b481de9c ZY |
666 | } |
667 | ||
fa254a68 | 668 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 669 | |
74221d07 AM |
670 | /* for recent assoc, choose best rate regarding |
671 | * to rssi value | |
672 | */ | |
fa254a68 | 673 | if (rs_sta->start_rate != IWL_RATE_INVALID) { |
74221d07 AM |
674 | if (rs_sta->start_rate < index && |
675 | (rate_mask & (1 << rs_sta->start_rate))) | |
676 | index = rs_sta->start_rate; | |
fa254a68 | 677 | rs_sta->start_rate = IWL_RATE_INVALID; |
b481de9c ZY |
678 | } |
679 | ||
c6ec7a9b AM |
680 | /* force user max rate if set by user */ |
681 | if ((max_rate_idx != -1) && (max_rate_idx < index)) { | |
682 | if (rate_mask & (1 << max_rate_idx)) | |
683 | index = max_rate_idx; | |
684 | } | |
685 | ||
fa254a68 | 686 | window = &(rs_sta->win[index]); |
b481de9c ZY |
687 | |
688 | fail_count = window->counter - window->success_counter; | |
689 | ||
dd5b687e | 690 | if (((fail_count < IWL_RATE_MIN_FAILURE_TH) && |
b481de9c | 691 | (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))) { |
fa254a68 | 692 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c | 693 | |
e1623446 | 694 | IWL_DEBUG_RATE(priv, "Invalid average_tpt on rate %d: " |
b481de9c ZY |
695 | "counter: %d, success_counter: %d, " |
696 | "expected_tpt is %sNULL\n", | |
697 | index, | |
698 | window->counter, | |
699 | window->success_counter, | |
fa254a68 | 700 | rs_sta->expected_tpt ? "not " : ""); |
dd5b687e AK |
701 | |
702 | /* Can't calculate this yet; not enough history */ | |
703 | window->average_tpt = IWL_INVALID_VALUE; | |
b481de9c ZY |
704 | goto out; |
705 | ||
706 | } | |
707 | ||
b481de9c ZY |
708 | current_tpt = window->average_tpt; |
709 | ||
fa254a68 | 710 | high_low = iwl3945_get_adjacent_rate(rs_sta, index, rate_mask, |
28447f3c | 711 | sband->band); |
b481de9c ZY |
712 | low = high_low & 0xff; |
713 | high = (high_low >> 8) & 0xff; | |
714 | ||
c6ec7a9b AM |
715 | /* If user set max rate, dont allow higher than user constrain */ |
716 | if ((max_rate_idx != -1) && (max_rate_idx < high)) | |
717 | high = IWL_RATE_INVALID; | |
718 | ||
dd5b687e | 719 | /* Collect Measured throughputs of adjacent rates */ |
b481de9c | 720 | if (low != IWL_RATE_INVALID) |
fa254a68 | 721 | low_tpt = rs_sta->win[low].average_tpt; |
b481de9c ZY |
722 | |
723 | if (high != IWL_RATE_INVALID) | |
fa254a68 | 724 | high_tpt = rs_sta->win[high].average_tpt; |
b481de9c | 725 | |
fa254a68 | 726 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c | 727 | |
dd5b687e | 728 | scale_action = 0; |
b481de9c | 729 | |
dd5b687e | 730 | /* Low success ratio , need to drop the rate */ |
b481de9c | 731 | if ((window->success_ratio < IWL_RATE_DECREASE_TH) || !current_tpt) { |
e1623446 | 732 | IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n"); |
b481de9c | 733 | scale_action = -1; |
dd5b687e AK |
734 | /* No throughput measured yet for adjacent rates, |
735 | * try increase */ | |
d9829a67 | 736 | } else if ((low_tpt == IWL_INVALID_VALUE) && |
dd5b687e AK |
737 | (high_tpt == IWL_INVALID_VALUE)) { |
738 | ||
82127493 | 739 | if (high != IWL_RATE_INVALID && window->success_ratio >= IWL_RATE_INCREASE_TH) |
dd5b687e AK |
740 | scale_action = 1; |
741 | else if (low != IWL_RATE_INVALID) | |
82127493 | 742 | scale_action = 0; |
dd5b687e AK |
743 | |
744 | /* Both adjacent throughputs are measured, but neither one has | |
745 | * better throughput; we're using the best rate, don't change | |
746 | * it! */ | |
747 | } else if ((low_tpt != IWL_INVALID_VALUE) && | |
d9829a67 | 748 | (high_tpt != IWL_INVALID_VALUE) && |
28447f3c | 749 | (low_tpt < current_tpt) && (high_tpt < current_tpt)) { |
dd5b687e | 750 | |
e1623446 | 751 | IWL_DEBUG_RATE(priv, "No action -- low [%d] & high [%d] < " |
b481de9c ZY |
752 | "current_tpt [%d]\n", |
753 | low_tpt, high_tpt, current_tpt); | |
754 | scale_action = 0; | |
dd5b687e AK |
755 | |
756 | /* At least one of the rates has better throughput */ | |
b481de9c | 757 | } else { |
d9829a67 | 758 | if (high_tpt != IWL_INVALID_VALUE) { |
dd5b687e AK |
759 | |
760 | /* High rate has better throughput, Increase | |
761 | * rate */ | |
762 | if (high_tpt > current_tpt && | |
763 | window->success_ratio >= IWL_RATE_INCREASE_TH) | |
b481de9c ZY |
764 | scale_action = 1; |
765 | else { | |
e1623446 TW |
766 | IWL_DEBUG_RATE(priv, |
767 | "decrease rate because of high tpt\n"); | |
82127493 | 768 | scale_action = 0; |
b481de9c | 769 | } |
d9829a67 | 770 | } else if (low_tpt != IWL_INVALID_VALUE) { |
b481de9c | 771 | if (low_tpt > current_tpt) { |
e1623446 TW |
772 | IWL_DEBUG_RATE(priv, |
773 | "decrease rate because of low tpt\n"); | |
b481de9c | 774 | scale_action = -1; |
82127493 | 775 | } else if (window->success_ratio >= IWL_RATE_INCREASE_TH) { |
dd5b687e AK |
776 | /* Lower rate has better |
777 | * throughput,decrease rate */ | |
b481de9c | 778 | scale_action = 1; |
dd5b687e | 779 | } |
b481de9c ZY |
780 | } |
781 | } | |
782 | ||
dd5b687e AK |
783 | /* Sanity check; asked for decrease, but success rate or throughput |
784 | * has been good at old rate. Don't change it. */ | |
785 | if ((scale_action == -1) && (low != IWL_RATE_INVALID) && | |
786 | ((window->success_ratio > IWL_RATE_HIGH_TH) || | |
787 | (current_tpt > (100 * rs_sta->expected_tpt[low])))) | |
788 | scale_action = 0; | |
b481de9c ZY |
789 | |
790 | switch (scale_action) { | |
791 | case -1: | |
dd5b687e AK |
792 | |
793 | /* Decrese rate */ | |
b481de9c ZY |
794 | if (low != IWL_RATE_INVALID) |
795 | index = low; | |
796 | break; | |
797 | ||
798 | case 1: | |
dd5b687e | 799 | /* Increase rate */ |
b481de9c ZY |
800 | if (high != IWL_RATE_INVALID) |
801 | index = high; | |
802 | ||
803 | break; | |
804 | ||
805 | case 0: | |
806 | default: | |
dd5b687e | 807 | /* No change */ |
b481de9c ZY |
808 | break; |
809 | } | |
810 | ||
e1623446 | 811 | IWL_DEBUG_RATE(priv, "Selected %d (action %d) - low %d high %d\n", |
b481de9c ZY |
812 | index, scale_action, low, high); |
813 | ||
814 | out: | |
815 | ||
b7e35008 | 816 | rs_sta->last_txrate_idx = index; |
28447f3c | 817 | if (sband->band == IEEE80211_BAND_5GHZ) |
e6a9854b JB |
818 | info->control.rates[0].idx = rs_sta->last_txrate_idx - |
819 | IWL_FIRST_OFDM_RATE; | |
14577f23 | 820 | else |
e6a9854b | 821 | info->control.rates[0].idx = rs_sta->last_txrate_idx; |
14577f23 | 822 | |
e1623446 | 823 | IWL_DEBUG_RATE(priv, "leave: %d\n", index); |
b481de9c ZY |
824 | } |
825 | ||
c30e30e1 AM |
826 | #ifdef CONFIG_MAC80211_DEBUGFS |
827 | static int iwl3945_open_file_generic(struct inode *inode, struct file *file) | |
828 | { | |
829 | file->private_data = inode->i_private; | |
830 | return 0; | |
831 | } | |
832 | ||
833 | static ssize_t iwl3945_sta_dbgfs_stats_table_read(struct file *file, | |
834 | char __user *user_buf, | |
835 | size_t count, loff_t *ppos) | |
836 | { | |
a412c804 | 837 | char *buff; |
c30e30e1 AM |
838 | int desc = 0; |
839 | int j; | |
a412c804 | 840 | ssize_t ret; |
c30e30e1 AM |
841 | struct iwl3945_rs_sta *lq_sta = file->private_data; |
842 | ||
a412c804 FS |
843 | buff = kmalloc(1024, GFP_KERNEL); |
844 | if (!buff) | |
845 | return -ENOMEM; | |
846 | ||
c30e30e1 AM |
847 | desc += sprintf(buff + desc, "tx packets=%d last rate index=%d\n" |
848 | "rate=0x%X flush time %d\n", | |
849 | lq_sta->tx_packets, | |
850 | lq_sta->last_txrate_idx, | |
851 | lq_sta->start_rate, jiffies_to_msecs(lq_sta->flush_time)); | |
d9829a67 | 852 | for (j = 0; j < IWL_RATE_COUNT_3945; j++) { |
c30e30e1 AM |
853 | desc += sprintf(buff+desc, |
854 | "counter=%d success=%d %%=%d\n", | |
855 | lq_sta->win[j].counter, | |
856 | lq_sta->win[j].success_counter, | |
857 | lq_sta->win[j].success_ratio); | |
858 | } | |
a412c804 FS |
859 | ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); |
860 | kfree(buff); | |
861 | return ret; | |
c30e30e1 AM |
862 | } |
863 | ||
864 | static const struct file_operations rs_sta_dbgfs_stats_table_ops = { | |
865 | .read = iwl3945_sta_dbgfs_stats_table_read, | |
866 | .open = iwl3945_open_file_generic, | |
867 | }; | |
868 | ||
869 | static void iwl3945_add_debugfs(void *priv, void *priv_sta, | |
870 | struct dentry *dir) | |
871 | { | |
872 | struct iwl3945_rs_sta *lq_sta = priv_sta; | |
873 | ||
874 | lq_sta->rs_sta_dbgfs_stats_table_file = | |
875 | debugfs_create_file("rate_stats_table", 0600, dir, | |
876 | lq_sta, &rs_sta_dbgfs_stats_table_ops); | |
877 | ||
878 | } | |
879 | ||
880 | static void iwl3945_remove_debugfs(void *priv, void *priv_sta) | |
881 | { | |
882 | struct iwl3945_rs_sta *lq_sta = priv_sta; | |
883 | debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file); | |
884 | } | |
885 | #endif | |
886 | ||
b481de9c ZY |
887 | static struct rate_control_ops rs_ops = { |
888 | .module = NULL, | |
889 | .name = RS_NAME, | |
890 | .tx_status = rs_tx_status, | |
891 | .get_rate = rs_get_rate, | |
892 | .rate_init = rs_rate_init, | |
b481de9c ZY |
893 | .alloc = rs_alloc, |
894 | .free = rs_free, | |
895 | .alloc_sta = rs_alloc_sta, | |
896 | .free_sta = rs_free_sta, | |
c30e30e1 AM |
897 | #ifdef CONFIG_MAC80211_DEBUGFS |
898 | .add_sta_debugfs = iwl3945_add_debugfs, | |
899 | .remove_sta_debugfs = iwl3945_remove_debugfs, | |
900 | #endif | |
901 | ||
b481de9c ZY |
902 | }; |
903 | ||
bb8c093b | 904 | void iwl3945_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id) |
b481de9c | 905 | { |
4a8a4322 | 906 | struct iwl_priv *priv = hw->priv; |
b481de9c ZY |
907 | s32 rssi = 0; |
908 | unsigned long flags; | |
fa254a68 | 909 | struct iwl3945_rs_sta *rs_sta; |
4b7679a5 JB |
910 | struct ieee80211_sta *sta; |
911 | struct iwl3945_sta_priv *psta; | |
b481de9c | 912 | |
e1623446 | 913 | IWL_DEBUG_RATE(priv, "enter\n"); |
b481de9c | 914 | |
d0709a65 JB |
915 | rcu_read_lock(); |
916 | ||
5ed176e1 JB |
917 | sta = ieee80211_find_sta(priv->vif, |
918 | priv->stations[sta_id].sta.sta.addr); | |
52518189 | 919 | if (!sta) { |
d0709a65 | 920 | rcu_read_unlock(); |
b481de9c ZY |
921 | return; |
922 | } | |
923 | ||
52518189 | 924 | psta = (void *) sta->drv_priv; |
62a94926 | 925 | rs_sta = &psta->rs_sta; |
b481de9c | 926 | |
fa254a68 | 927 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 928 | |
fa254a68 | 929 | rs_sta->tgg = 0; |
8318d78a JB |
930 | switch (priv->band) { |
931 | case IEEE80211_BAND_2GHZ: | |
932 | /* TODO: this always does G, not a regression */ | |
8ccde88a | 933 | if (priv->active_rxon.flags & RXON_FLG_TGG_PROTECT_MSK) { |
fa254a68 TW |
934 | rs_sta->tgg = 1; |
935 | rs_sta->expected_tpt = iwl3945_expected_tpt_g_prot; | |
b481de9c | 936 | } else |
fa254a68 | 937 | rs_sta->expected_tpt = iwl3945_expected_tpt_g; |
b481de9c ZY |
938 | break; |
939 | ||
8318d78a | 940 | case IEEE80211_BAND_5GHZ: |
fa254a68 | 941 | rs_sta->expected_tpt = iwl3945_expected_tpt_a; |
b481de9c | 942 | break; |
8318d78a JB |
943 | case IEEE80211_NUM_BANDS: |
944 | BUG(); | |
b481de9c ZY |
945 | break; |
946 | } | |
947 | ||
fa254a68 | 948 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c ZY |
949 | |
950 | rssi = priv->last_rx_rssi; | |
951 | if (rssi == 0) | |
952 | rssi = IWL_MIN_RSSI_VAL; | |
953 | ||
e1623446 | 954 | IWL_DEBUG_RATE(priv, "Network RSSI: %d\n", rssi); |
b481de9c | 955 | |
8318d78a | 956 | rs_sta->start_rate = iwl3945_get_rate_index_by_rssi(rssi, priv->band); |
b481de9c | 957 | |
e1623446 | 958 | IWL_DEBUG_RATE(priv, "leave: rssi %d assign rate index: " |
fa254a68 TW |
959 | "%d (plcp 0x%x)\n", rssi, rs_sta->start_rate, |
960 | iwl3945_rates[rs_sta->start_rate].plcp); | |
52518189 | 961 | rcu_read_unlock(); |
b481de9c ZY |
962 | } |
963 | ||
897e1cf2 | 964 | int iwl3945_rate_control_register(void) |
b481de9c | 965 | { |
897e1cf2 | 966 | return ieee80211_rate_control_register(&rs_ops); |
b481de9c ZY |
967 | } |
968 | ||
897e1cf2 | 969 | void iwl3945_rate_control_unregister(void) |
b481de9c ZY |
970 | { |
971 | ieee80211_rate_control_unregister(&rs_ops); | |
972 | } | |
973 | ||
974 |