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4bc85c13 WYG |
1 | /****************************************************************************** |
2 | * | |
be663ab6 | 3 | * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved. |
4bc85c13 WYG |
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: | |
22 | * Intel Linux Wireless <ilw@linux.intel.com> | |
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/slab.h> | |
4bc85c13 WYG |
31 | #include <net/mac80211.h> |
32 | ||
33 | #include <linux/netdevice.h> | |
34 | #include <linux/etherdevice.h> | |
35 | #include <linux/delay.h> | |
36 | ||
37 | #include <linux/workqueue.h> | |
38 | ||
39 | #include "iwl-commands.h" | |
40 | #include "iwl-3945.h" | |
41 | #include "iwl-sta.h" | |
42 | ||
43 | #define RS_NAME "iwl-3945-rs" | |
44 | ||
e2ebc833 | 45 | static s32 il3945_expected_tpt_g[IL_RATE_COUNT_3945] = { |
4bc85c13 WYG |
46 | 7, 13, 35, 58, 0, 0, 76, 104, 130, 168, 191, 202 |
47 | }; | |
48 | ||
e2ebc833 | 49 | static s32 il3945_expected_tpt_g_prot[IL_RATE_COUNT_3945] = { |
4bc85c13 WYG |
50 | 7, 13, 35, 58, 0, 0, 0, 80, 93, 113, 123, 125 |
51 | }; | |
52 | ||
e2ebc833 | 53 | static s32 il3945_expected_tpt_a[IL_RATE_COUNT_3945] = { |
4bc85c13 WYG |
54 | 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186 |
55 | }; | |
56 | ||
e2ebc833 | 57 | static s32 il3945_expected_tpt_b[IL_RATE_COUNT_3945] = { |
4bc85c13 WYG |
58 | 7, 13, 35, 58, 0, 0, 0, 0, 0, 0, 0, 0 |
59 | }; | |
60 | ||
e2ebc833 | 61 | struct il3945_tpt_entry { |
4bc85c13 WYG |
62 | s8 min_rssi; |
63 | u8 index; | |
64 | }; | |
65 | ||
e2ebc833 SG |
66 | static struct il3945_tpt_entry il3945_tpt_table_a[] = { |
67 | {-60, IL_RATE_54M_INDEX}, | |
68 | {-64, IL_RATE_48M_INDEX}, | |
69 | {-72, IL_RATE_36M_INDEX}, | |
70 | {-80, IL_RATE_24M_INDEX}, | |
71 | {-84, IL_RATE_18M_INDEX}, | |
72 | {-85, IL_RATE_12M_INDEX}, | |
73 | {-87, IL_RATE_9M_INDEX}, | |
74 | {-89, IL_RATE_6M_INDEX} | |
4bc85c13 WYG |
75 | }; |
76 | ||
e2ebc833 SG |
77 | static struct il3945_tpt_entry il3945_tpt_table_g[] = { |
78 | {-60, IL_RATE_54M_INDEX}, | |
79 | {-64, IL_RATE_48M_INDEX}, | |
80 | {-68, IL_RATE_36M_INDEX}, | |
81 | {-80, IL_RATE_24M_INDEX}, | |
82 | {-84, IL_RATE_18M_INDEX}, | |
83 | {-85, IL_RATE_12M_INDEX}, | |
84 | {-86, IL_RATE_11M_INDEX}, | |
85 | {-88, IL_RATE_5M_INDEX}, | |
86 | {-90, IL_RATE_2M_INDEX}, | |
87 | {-92, IL_RATE_1M_INDEX} | |
4bc85c13 WYG |
88 | }; |
89 | ||
e2ebc833 SG |
90 | #define IL_RATE_MAX_WINDOW 62 |
91 | #define IL_RATE_FLUSH (3*HZ) | |
92 | #define IL_RATE_WIN_FLUSH (HZ/2) | |
d3175167 | 93 | #define IL39_RATE_HIGH_TH 11520 |
e2ebc833 SG |
94 | #define IL_SUCCESS_UP_TH 8960 |
95 | #define IL_SUCCESS_DOWN_TH 10880 | |
96 | #define IL_RATE_MIN_FAILURE_TH 6 | |
97 | #define IL_RATE_MIN_SUCCESS_TH 8 | |
98 | #define IL_RATE_DECREASE_TH 1920 | |
99 | #define IL_RATE_RETRY_TH 15 | |
100 | ||
101 | static u8 il3945_get_rate_index_by_rssi(s32 rssi, enum ieee80211_band band) | |
4bc85c13 WYG |
102 | { |
103 | u32 index = 0; | |
104 | u32 table_size = 0; | |
e2ebc833 | 105 | struct il3945_tpt_entry *tpt_table = NULL; |
4bc85c13 | 106 | |
232913b5 | 107 | if (rssi < IL_MIN_RSSI_VAL || rssi > IL_MAX_RSSI_VAL) |
e2ebc833 | 108 | rssi = IL_MIN_RSSI_VAL; |
4bc85c13 WYG |
109 | |
110 | switch (band) { | |
111 | case IEEE80211_BAND_2GHZ: | |
e2ebc833 SG |
112 | tpt_table = il3945_tpt_table_g; |
113 | table_size = ARRAY_SIZE(il3945_tpt_table_g); | |
4bc85c13 WYG |
114 | break; |
115 | ||
116 | case IEEE80211_BAND_5GHZ: | |
e2ebc833 SG |
117 | tpt_table = il3945_tpt_table_a; |
118 | table_size = ARRAY_SIZE(il3945_tpt_table_a); | |
4bc85c13 WYG |
119 | break; |
120 | ||
121 | default: | |
122 | BUG(); | |
123 | break; | |
124 | } | |
125 | ||
232913b5 | 126 | while (index < table_size && rssi < tpt_table[index].min_rssi) |
4bc85c13 WYG |
127 | index++; |
128 | ||
129 | index = min(index, (table_size - 1)); | |
130 | ||
131 | return tpt_table[index].index; | |
132 | } | |
133 | ||
6ce1dc45 | 134 | static void il3945_clear_win(struct il3945_rate_scale_data *win) |
4bc85c13 | 135 | { |
6ce1dc45 SG |
136 | win->data = 0; |
137 | win->success_counter = 0; | |
138 | win->success_ratio = -1; | |
139 | win->counter = 0; | |
140 | win->average_tpt = IL_INVALID_VALUE; | |
141 | win->stamp = 0; | |
4bc85c13 WYG |
142 | } |
143 | ||
144 | /** | |
6ce1dc45 | 145 | * il3945_rate_scale_flush_wins - flush out the rate scale wins |
4bc85c13 | 146 | * |
6ce1dc45 | 147 | * Returns the number of wins that have gathered data but were |
4bc85c13 WYG |
148 | * not flushed. If there were any that were not flushed, then |
149 | * reschedule the rate flushing routine. | |
150 | */ | |
6ce1dc45 | 151 | static int il3945_rate_scale_flush_wins(struct il3945_rs_sta *rs_sta) |
4bc85c13 WYG |
152 | { |
153 | int unflushed = 0; | |
154 | int i; | |
155 | unsigned long flags; | |
46bc8d4b | 156 | struct il_priv *il __maybe_unused = rs_sta->il; |
4bc85c13 WYG |
157 | |
158 | /* | |
159 | * For each rate, if we have collected data on that rate | |
e2ebc833 | 160 | * and it has been more than IL_RATE_WIN_FLUSH |
ebf0d90d | 161 | * since we flushed, clear out the gathered stats |
4bc85c13 | 162 | */ |
e2ebc833 | 163 | for (i = 0; i < IL_RATE_COUNT_3945; i++) { |
4bc85c13 WYG |
164 | if (!rs_sta->win[i].counter) |
165 | continue; | |
166 | ||
167 | spin_lock_irqsave(&rs_sta->lock, flags); | |
168 | if (time_after(jiffies, rs_sta->win[i].stamp + | |
e2ebc833 | 169 | IL_RATE_WIN_FLUSH)) { |
58de00a4 | 170 | D_RATE("flushing %d samples of rate " |
4bc85c13 WYG |
171 | "index %d\n", |
172 | rs_sta->win[i].counter, i); | |
6ce1dc45 | 173 | il3945_clear_win(&rs_sta->win[i]); |
4bc85c13 WYG |
174 | } else |
175 | unflushed++; | |
176 | spin_unlock_irqrestore(&rs_sta->lock, flags); | |
177 | } | |
178 | ||
179 | return unflushed; | |
180 | } | |
181 | ||
e2ebc833 SG |
182 | #define IL_RATE_FLUSH_MAX 5000 /* msec */ |
183 | #define IL_RATE_FLUSH_MIN 50 /* msec */ | |
184 | #define IL_AVERAGE_PACKETS 1500 | |
4bc85c13 | 185 | |
e2ebc833 | 186 | static void il3945_bg_rate_scale_flush(unsigned long data) |
4bc85c13 | 187 | { |
e2ebc833 | 188 | struct il3945_rs_sta *rs_sta = (void *)data; |
46bc8d4b | 189 | struct il_priv *il __maybe_unused = rs_sta->il; |
4bc85c13 WYG |
190 | int unflushed = 0; |
191 | unsigned long flags; | |
192 | u32 packet_count, duration, pps; | |
193 | ||
58de00a4 | 194 | D_RATE("enter\n"); |
4bc85c13 | 195 | |
6ce1dc45 | 196 | unflushed = il3945_rate_scale_flush_wins(rs_sta); |
4bc85c13 WYG |
197 | |
198 | spin_lock_irqsave(&rs_sta->lock, flags); | |
199 | ||
200 | /* Number of packets Rx'd since last time this timer ran */ | |
201 | packet_count = (rs_sta->tx_packets - rs_sta->last_tx_packets) + 1; | |
202 | ||
203 | rs_sta->last_tx_packets = rs_sta->tx_packets + 1; | |
204 | ||
205 | if (unflushed) { | |
206 | duration = | |
207 | jiffies_to_msecs(jiffies - rs_sta->last_partial_flush); | |
208 | ||
58de00a4 | 209 | D_RATE("Tx'd %d packets in %dms\n", |
4bc85c13 WYG |
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) { | |
e2ebc833 SG |
219 | duration = (IL_AVERAGE_PACKETS * 1000) / pps; |
220 | if (duration < IL_RATE_FLUSH_MIN) | |
221 | duration = IL_RATE_FLUSH_MIN; | |
222 | else if (duration > IL_RATE_FLUSH_MAX) | |
223 | duration = IL_RATE_FLUSH_MAX; | |
4bc85c13 | 224 | } else |
e2ebc833 | 225 | duration = IL_RATE_FLUSH_MAX; |
4bc85c13 WYG |
226 | |
227 | rs_sta->flush_time = msecs_to_jiffies(duration); | |
228 | ||
58de00a4 | 229 | D_RATE("new flush period: %d msec ave %d\n", |
4bc85c13 WYG |
230 | duration, packet_count); |
231 | ||
232 | mod_timer(&rs_sta->rate_scale_flush, jiffies + | |
233 | rs_sta->flush_time); | |
234 | ||
235 | rs_sta->last_partial_flush = jiffies; | |
236 | } else { | |
e2ebc833 | 237 | rs_sta->flush_time = IL_RATE_FLUSH; |
4bc85c13 WYG |
238 | rs_sta->flush_pending = 0; |
239 | } | |
240 | /* If there weren't any unflushed entries, we don't schedule the timer | |
241 | * to run again */ | |
242 | ||
243 | rs_sta->last_flush = jiffies; | |
244 | ||
245 | spin_unlock_irqrestore(&rs_sta->lock, flags); | |
246 | ||
58de00a4 | 247 | D_RATE("leave\n"); |
4bc85c13 WYG |
248 | } |
249 | ||
250 | /** | |
6ce1dc45 | 251 | * il3945_collect_tx_data - Update the success/failure sliding win |
4bc85c13 | 252 | * |
6ce1dc45 SG |
253 | * We keep a sliding win of the last 64 packets transmitted |
254 | * at this rate. win->data contains the bitmask of successful | |
4bc85c13 WYG |
255 | * packets. |
256 | */ | |
e2ebc833 | 257 | static void il3945_collect_tx_data(struct il3945_rs_sta *rs_sta, |
6ce1dc45 | 258 | struct il3945_rate_scale_data *win, |
4bc85c13 WYG |
259 | int success, int retries, int index) |
260 | { | |
261 | unsigned long flags; | |
262 | s32 fail_count; | |
46bc8d4b | 263 | struct il_priv *il __maybe_unused = rs_sta->il; |
4bc85c13 WYG |
264 | |
265 | if (!retries) { | |
58de00a4 | 266 | D_RATE("leave: retries == 0 -- should be at least 1\n"); |
4bc85c13 WYG |
267 | return; |
268 | } | |
269 | ||
270 | spin_lock_irqsave(&rs_sta->lock, flags); | |
271 | ||
272 | /* | |
273 | * Keep track of only the latest 62 tx frame attempts in this rate's | |
6ce1dc45 SG |
274 | * history win; anything older isn't really relevant any more. |
275 | * If we have filled up the sliding win, drop the oldest attempt; | |
4bc85c13 WYG |
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) { | |
6ce1dc45 | 281 | if (win->counter >= IL_RATE_MAX_WINDOW) { |
4bc85c13 WYG |
282 | |
283 | /* remove earliest */ | |
6ce1dc45 | 284 | win->counter = IL_RATE_MAX_WINDOW - 1; |
4bc85c13 | 285 | |
6ce1dc45 SG |
286 | if (win->data & (1ULL << (IL_RATE_MAX_WINDOW - 1))) { |
287 | win->data &= ~(1ULL << (IL_RATE_MAX_WINDOW - 1)); | |
288 | win->success_counter--; | |
4bc85c13 WYG |
289 | } |
290 | } | |
291 | ||
292 | /* Increment frames-attempted counter */ | |
6ce1dc45 | 293 | win->counter++; |
4bc85c13 WYG |
294 | |
295 | /* Shift bitmap by one frame (throw away oldest history), | |
296 | * OR in "1", and increment "success" if this | |
297 | * frame was successful. */ | |
6ce1dc45 | 298 | win->data <<= 1; |
4bc85c13 | 299 | if (success > 0) { |
6ce1dc45 SG |
300 | win->success_counter++; |
301 | win->data |= 0x1; | |
4bc85c13 WYG |
302 | success--; |
303 | } | |
304 | ||
305 | retries--; | |
306 | } | |
307 | ||
308 | /* Calculate current success ratio, avoid divide-by-0! */ | |
6ce1dc45 SG |
309 | if (win->counter > 0) |
310 | win->success_ratio = 128 * (100 * win->success_counter) | |
311 | / win->counter; | |
4bc85c13 | 312 | else |
6ce1dc45 | 313 | win->success_ratio = IL_INVALID_VALUE; |
4bc85c13 | 314 | |
6ce1dc45 | 315 | fail_count = win->counter - win->success_counter; |
4bc85c13 WYG |
316 | |
317 | /* Calculate average throughput, if we have enough history. */ | |
232913b5 | 318 | if (fail_count >= IL_RATE_MIN_FAILURE_TH || |
6ce1dc45 SG |
319 | win->success_counter >= IL_RATE_MIN_SUCCESS_TH) |
320 | win->average_tpt = ((win->success_ratio * | |
4bc85c13 WYG |
321 | rs_sta->expected_tpt[index] + 64) / 128); |
322 | else | |
6ce1dc45 | 323 | win->average_tpt = IL_INVALID_VALUE; |
4bc85c13 | 324 | |
6ce1dc45 SG |
325 | /* Tag this win as having been updated */ |
326 | win->stamp = jiffies; | |
4bc85c13 WYG |
327 | |
328 | spin_unlock_irqrestore(&rs_sta->lock, flags); | |
329 | ||
330 | } | |
331 | ||
332 | /* | |
333 | * Called after adding a new station to initialize rate scaling | |
334 | */ | |
46bc8d4b | 335 | void il3945_rs_rate_init(struct il_priv *il, struct ieee80211_sta *sta, u8 sta_id) |
4bc85c13 | 336 | { |
46bc8d4b SG |
337 | struct ieee80211_hw *hw = il->hw; |
338 | struct ieee80211_conf *conf = &il->hw->conf; | |
e2ebc833 SG |
339 | struct il3945_sta_priv *psta; |
340 | struct il3945_rs_sta *rs_sta; | |
4bc85c13 WYG |
341 | struct ieee80211_supported_band *sband; |
342 | int i; | |
343 | ||
58de00a4 | 344 | D_INFO("enter\n"); |
7c2cde2e | 345 | if (sta_id == il->ctx.bcast_sta_id) |
4bc85c13 WYG |
346 | goto out; |
347 | ||
e2ebc833 | 348 | psta = (struct il3945_sta_priv *) sta->drv_priv; |
4bc85c13 WYG |
349 | rs_sta = &psta->rs_sta; |
350 | sband = hw->wiphy->bands[conf->channel->band]; | |
351 | ||
46bc8d4b | 352 | rs_sta->il = il; |
4bc85c13 | 353 | |
e2ebc833 | 354 | rs_sta->start_rate = IL_RATE_INVALID; |
4bc85c13 WYG |
355 | |
356 | /* default to just 802.11b */ | |
e2ebc833 | 357 | rs_sta->expected_tpt = il3945_expected_tpt_b; |
4bc85c13 WYG |
358 | |
359 | rs_sta->last_partial_flush = jiffies; | |
360 | rs_sta->last_flush = jiffies; | |
e2ebc833 | 361 | rs_sta->flush_time = IL_RATE_FLUSH; |
4bc85c13 WYG |
362 | rs_sta->last_tx_packets = 0; |
363 | ||
364 | rs_sta->rate_scale_flush.data = (unsigned long)rs_sta; | |
e2ebc833 | 365 | rs_sta->rate_scale_flush.function = il3945_bg_rate_scale_flush; |
4bc85c13 | 366 | |
e2ebc833 | 367 | for (i = 0; i < IL_RATE_COUNT_3945; i++) |
6ce1dc45 | 368 | il3945_clear_win(&rs_sta->win[i]); |
4bc85c13 WYG |
369 | |
370 | /* TODO: what is a good starting rate for STA? About middle? Maybe not | |
371 | * the lowest or the highest rate.. Could consider using RSSI from | |
372 | * previous packets? Need to have IEEE 802.1X auth succeed immediately | |
373 | * after assoc.. */ | |
374 | ||
375 | for (i = sband->n_bitrates - 1; i >= 0; i--) { | |
376 | if (sta->supp_rates[sband->band] & (1 << i)) { | |
377 | rs_sta->last_txrate_idx = i; | |
378 | break; | |
379 | } | |
380 | } | |
381 | ||
46bc8d4b | 382 | il->_3945.sta_supp_rates = sta->supp_rates[sband->band]; |
e2ebc833 | 383 | /* For 5 GHz band it start at IL_FIRST_OFDM_RATE */ |
4bc85c13 | 384 | if (sband->band == IEEE80211_BAND_5GHZ) { |
e2ebc833 | 385 | rs_sta->last_txrate_idx += IL_FIRST_OFDM_RATE; |
46bc8d4b | 386 | il->_3945.sta_supp_rates = il->_3945.sta_supp_rates << |
e2ebc833 | 387 | IL_FIRST_OFDM_RATE; |
4bc85c13 WYG |
388 | } |
389 | ||
390 | out: | |
46bc8d4b | 391 | il->stations[sta_id].used &= ~IL_STA_UCODE_INPROGRESS; |
4bc85c13 | 392 | |
58de00a4 | 393 | D_INFO("leave\n"); |
4bc85c13 WYG |
394 | } |
395 | ||
e2ebc833 | 396 | static void *il3945_rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) |
4bc85c13 WYG |
397 | { |
398 | return hw->priv; | |
399 | } | |
400 | ||
401 | /* rate scale requires free function to be implemented */ | |
46bc8d4b | 402 | static void il3945_rs_free(void *il) |
4bc85c13 WYG |
403 | { |
404 | return; | |
405 | } | |
406 | ||
e2ebc833 | 407 | static void *il3945_rs_alloc_sta(void *il_priv, struct ieee80211_sta *sta, gfp_t gfp) |
4bc85c13 | 408 | { |
e2ebc833 SG |
409 | struct il3945_rs_sta *rs_sta; |
410 | struct il3945_sta_priv *psta = (void *) sta->drv_priv; | |
46bc8d4b | 411 | struct il_priv *il __maybe_unused = il_priv; |
4bc85c13 | 412 | |
58de00a4 | 413 | D_RATE("enter\n"); |
4bc85c13 WYG |
414 | |
415 | rs_sta = &psta->rs_sta; | |
416 | ||
417 | spin_lock_init(&rs_sta->lock); | |
418 | init_timer(&rs_sta->rate_scale_flush); | |
419 | ||
58de00a4 | 420 | D_RATE("leave\n"); |
4bc85c13 WYG |
421 | |
422 | return rs_sta; | |
423 | } | |
424 | ||
e2ebc833 | 425 | static void il3945_rs_free_sta(void *il_priv, struct ieee80211_sta *sta, |
46bc8d4b | 426 | void *il_sta) |
4bc85c13 | 427 | { |
46bc8d4b | 428 | struct il3945_rs_sta *rs_sta = il_sta; |
4bc85c13 WYG |
429 | |
430 | /* | |
e2ebc833 SG |
431 | * Be careful not to use any members of il3945_rs_sta (like trying |
432 | * to use il_priv to print out debugging) since it may not be fully | |
4bc85c13 WYG |
433 | * initialized at this point. |
434 | */ | |
435 | del_timer_sync(&rs_sta->rate_scale_flush); | |
436 | } | |
437 | ||
438 | ||
439 | /** | |
e2ebc833 | 440 | * il3945_rs_tx_status - Update rate control values based on Tx results |
4bc85c13 | 441 | * |
e2ebc833 | 442 | * NOTE: Uses il_priv->retry_rate for the # of retries attempted by |
4bc85c13 WYG |
443 | * the hardware for each rate. |
444 | */ | |
46bc8d4b SG |
445 | static void il3945_rs_tx_status(void *il_rate, struct ieee80211_supported_band *sband, |
446 | struct ieee80211_sta *sta, void *il_sta, | |
4bc85c13 WYG |
447 | struct sk_buff *skb) |
448 | { | |
449 | s8 retries = 0, current_count; | |
450 | int scale_rate_index, first_index, last_index; | |
451 | unsigned long flags; | |
46bc8d4b SG |
452 | struct il_priv *il = (struct il_priv *)il_rate; |
453 | struct il3945_rs_sta *rs_sta = il_sta; | |
4bc85c13 WYG |
454 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
455 | ||
58de00a4 | 456 | D_RATE("enter\n"); |
4bc85c13 WYG |
457 | |
458 | retries = info->status.rates[0].count; | |
459 | /* Sanity Check for retries */ | |
e2ebc833 SG |
460 | if (retries > IL_RATE_RETRY_TH) |
461 | retries = IL_RATE_RETRY_TH; | |
4bc85c13 WYG |
462 | |
463 | first_index = sband->bitrates[info->status.rates[0].idx].hw_value; | |
232913b5 | 464 | if (first_index < 0 || first_index >= IL_RATE_COUNT_3945) { |
58de00a4 | 465 | D_RATE("leave: Rate out of bounds: %d\n", first_index); |
4bc85c13 WYG |
466 | return; |
467 | } | |
468 | ||
46bc8d4b | 469 | if (!il_sta) { |
58de00a4 | 470 | D_RATE("leave: No STA il data to update!\n"); |
4bc85c13 WYG |
471 | return; |
472 | } | |
473 | ||
474 | /* Treat uninitialized rate scaling data same as non-existing. */ | |
46bc8d4b | 475 | if (!rs_sta->il) { |
58de00a4 | 476 | D_RATE("leave: STA il data uninitialized!\n"); |
4bc85c13 WYG |
477 | return; |
478 | } | |
479 | ||
480 | ||
481 | rs_sta->tx_packets++; | |
482 | ||
483 | scale_rate_index = first_index; | |
484 | last_index = first_index; | |
485 | ||
486 | /* | |
6ce1dc45 | 487 | * Update the win for each rate. We determine which rates |
4bc85c13 WYG |
488 | * were Tx'd based on the total number of retries vs. the number |
489 | * of retries configured for each rate -- currently set to the | |
46bc8d4b | 490 | * il value 'retry_rate' vs. rate specific |
4bc85c13 WYG |
491 | * |
492 | * On exit from this while loop last_index indicates the rate | |
493 | * at which the frame was finally transmitted (or failed if no | |
494 | * ACK) | |
495 | */ | |
496 | while (retries > 1) { | |
46bc8d4b | 497 | if ((retries - 1) < il->retry_rate) { |
4bc85c13 WYG |
498 | current_count = (retries - 1); |
499 | last_index = scale_rate_index; | |
500 | } else { | |
46bc8d4b SG |
501 | current_count = il->retry_rate; |
502 | last_index = il3945_rs_next_rate(il, | |
4bc85c13 WYG |
503 | scale_rate_index); |
504 | } | |
505 | ||
506 | /* Update this rate accounting for as many retries | |
507 | * as was used for it (per current_count) */ | |
e2ebc833 | 508 | il3945_collect_tx_data(rs_sta, |
4bc85c13 WYG |
509 | &rs_sta->win[scale_rate_index], |
510 | 0, current_count, scale_rate_index); | |
58de00a4 | 511 | D_RATE("Update rate %d for %d retries.\n", |
4bc85c13 WYG |
512 | scale_rate_index, current_count); |
513 | ||
514 | retries -= current_count; | |
515 | ||
516 | scale_rate_index = last_index; | |
517 | } | |
518 | ||
519 | ||
6ce1dc45 | 520 | /* Update the last index win with success/failure based on ACK */ |
58de00a4 | 521 | D_RATE("Update rate %d with %s.\n", |
4bc85c13 WYG |
522 | last_index, |
523 | (info->flags & IEEE80211_TX_STAT_ACK) ? | |
524 | "success" : "failure"); | |
e2ebc833 | 525 | il3945_collect_tx_data(rs_sta, |
4bc85c13 WYG |
526 | &rs_sta->win[last_index], |
527 | info->flags & IEEE80211_TX_STAT_ACK, 1, last_index); | |
528 | ||
6ce1dc45 | 529 | /* We updated the rate scale win -- if its been more than |
4bc85c13 WYG |
530 | * flush_time since the last run, schedule the flush |
531 | * again */ | |
532 | spin_lock_irqsave(&rs_sta->lock, flags); | |
533 | ||
534 | if (!rs_sta->flush_pending && | |
535 | time_after(jiffies, rs_sta->last_flush + | |
536 | rs_sta->flush_time)) { | |
537 | ||
538 | rs_sta->last_partial_flush = jiffies; | |
539 | rs_sta->flush_pending = 1; | |
540 | mod_timer(&rs_sta->rate_scale_flush, | |
541 | jiffies + rs_sta->flush_time); | |
542 | } | |
543 | ||
544 | spin_unlock_irqrestore(&rs_sta->lock, flags); | |
545 | ||
58de00a4 | 546 | D_RATE("leave\n"); |
4bc85c13 WYG |
547 | } |
548 | ||
e2ebc833 | 549 | static u16 il3945_get_adjacent_rate(struct il3945_rs_sta *rs_sta, |
4bc85c13 WYG |
550 | u8 index, u16 rate_mask, enum ieee80211_band band) |
551 | { | |
e2ebc833 SG |
552 | u8 high = IL_RATE_INVALID; |
553 | u8 low = IL_RATE_INVALID; | |
46bc8d4b | 554 | struct il_priv *il __maybe_unused = rs_sta->il; |
4bc85c13 WYG |
555 | |
556 | /* 802.11A walks to the next literal adjacent rate in | |
557 | * the rate table */ | |
558 | if (unlikely(band == IEEE80211_BAND_5GHZ)) { | |
559 | int i; | |
560 | u32 mask; | |
561 | ||
562 | /* Find the previous rate that is in the rate mask */ | |
563 | i = index - 1; | |
564 | for (mask = (1 << i); i >= 0; i--, mask >>= 1) { | |
565 | if (rate_mask & mask) { | |
566 | low = i; | |
567 | break; | |
568 | } | |
569 | } | |
570 | ||
571 | /* Find the next rate that is in the rate mask */ | |
572 | i = index + 1; | |
e2ebc833 | 573 | for (mask = (1 << i); i < IL_RATE_COUNT_3945; |
4bc85c13 WYG |
574 | i++, mask <<= 1) { |
575 | if (rate_mask & mask) { | |
576 | high = i; | |
577 | break; | |
578 | } | |
579 | } | |
580 | ||
581 | return (high << 8) | low; | |
582 | } | |
583 | ||
584 | low = index; | |
e2ebc833 | 585 | while (low != IL_RATE_INVALID) { |
4bc85c13 | 586 | if (rs_sta->tgg) |
e2ebc833 | 587 | low = il3945_rates[low].prev_rs_tgg; |
4bc85c13 | 588 | else |
e2ebc833 SG |
589 | low = il3945_rates[low].prev_rs; |
590 | if (low == IL_RATE_INVALID) | |
4bc85c13 WYG |
591 | break; |
592 | if (rate_mask & (1 << low)) | |
593 | break; | |
58de00a4 | 594 | D_RATE("Skipping masked lower rate: %d\n", low); |
4bc85c13 WYG |
595 | } |
596 | ||
597 | high = index; | |
e2ebc833 | 598 | while (high != IL_RATE_INVALID) { |
4bc85c13 | 599 | if (rs_sta->tgg) |
e2ebc833 | 600 | high = il3945_rates[high].next_rs_tgg; |
4bc85c13 | 601 | else |
e2ebc833 SG |
602 | high = il3945_rates[high].next_rs; |
603 | if (high == IL_RATE_INVALID) | |
4bc85c13 WYG |
604 | break; |
605 | if (rate_mask & (1 << high)) | |
606 | break; | |
58de00a4 | 607 | D_RATE("Skipping masked higher rate: %d\n", high); |
4bc85c13 WYG |
608 | } |
609 | ||
610 | return (high << 8) | low; | |
611 | } | |
612 | ||
613 | /** | |
e2ebc833 | 614 | * il3945_rs_get_rate - find the rate for the requested packet |
4bc85c13 WYG |
615 | * |
616 | * Returns the ieee80211_rate structure allocated by the driver. | |
617 | * | |
618 | * The rate control algorithm has no internal mapping between hw_mode's | |
619 | * rate ordering and the rate ordering used by the rate control algorithm. | |
620 | * | |
621 | * The rate control algorithm uses a single table of rates that goes across | |
622 | * the entire A/B/G spectrum vs. being limited to just one particular | |
623 | * hw_mode. | |
624 | * | |
625 | * As such, we can't convert the index obtained below into the hw_mode's | |
626 | * rate table and must reference the driver allocated rate table | |
627 | * | |
628 | */ | |
46bc8d4b SG |
629 | static void il3945_rs_get_rate(void *il_r, struct ieee80211_sta *sta, |
630 | void *il_sta, struct ieee80211_tx_rate_control *txrc) | |
4bc85c13 WYG |
631 | { |
632 | struct ieee80211_supported_band *sband = txrc->sband; | |
633 | struct sk_buff *skb = txrc->skb; | |
e2ebc833 SG |
634 | u8 low = IL_RATE_INVALID; |
635 | u8 high = IL_RATE_INVALID; | |
4bc85c13 WYG |
636 | u16 high_low; |
637 | int index; | |
46bc8d4b | 638 | struct il3945_rs_sta *rs_sta = il_sta; |
6ce1dc45 | 639 | struct il3945_rate_scale_data *win = NULL; |
e2ebc833 SG |
640 | int current_tpt = IL_INVALID_VALUE; |
641 | int low_tpt = IL_INVALID_VALUE; | |
642 | int high_tpt = IL_INVALID_VALUE; | |
4bc85c13 WYG |
643 | u32 fail_count; |
644 | s8 scale_action = 0; | |
645 | unsigned long flags; | |
c3371d64 | 646 | u16 rate_mask; |
4bc85c13 | 647 | s8 max_rate_idx = -1; |
46bc8d4b | 648 | struct il_priv *il __maybe_unused = (struct il_priv *)il_r; |
4bc85c13 WYG |
649 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
650 | ||
58de00a4 | 651 | D_RATE("enter\n"); |
4bc85c13 WYG |
652 | |
653 | /* Treat uninitialized rate scaling data same as non-existing. */ | |
46bc8d4b | 654 | if (rs_sta && !rs_sta->il) { |
58de00a4 | 655 | D_RATE("Rate scaling information not initialized yet.\n"); |
46bc8d4b | 656 | il_sta = NULL; |
4bc85c13 WYG |
657 | } |
658 | ||
46bc8d4b | 659 | if (rate_control_send_low(sta, il_sta, txrc)) |
4bc85c13 WYG |
660 | return; |
661 | ||
662 | rate_mask = sta->supp_rates[sband->band]; | |
663 | ||
664 | /* get user max rate if set */ | |
665 | max_rate_idx = txrc->max_rate_idx; | |
232913b5 | 666 | if (sband->band == IEEE80211_BAND_5GHZ && max_rate_idx != -1) |
e2ebc833 | 667 | max_rate_idx += IL_FIRST_OFDM_RATE; |
232913b5 | 668 | if (max_rate_idx < 0 || max_rate_idx >= IL_RATE_COUNT) |
4bc85c13 WYG |
669 | max_rate_idx = -1; |
670 | ||
e2ebc833 | 671 | index = min(rs_sta->last_txrate_idx & 0xffff, IL_RATE_COUNT_3945 - 1); |
4bc85c13 WYG |
672 | |
673 | if (sband->band == IEEE80211_BAND_5GHZ) | |
e2ebc833 | 674 | rate_mask = rate_mask << IL_FIRST_OFDM_RATE; |
4bc85c13 WYG |
675 | |
676 | spin_lock_irqsave(&rs_sta->lock, flags); | |
677 | ||
678 | /* for recent assoc, choose best rate regarding | |
679 | * to rssi value | |
680 | */ | |
e2ebc833 | 681 | if (rs_sta->start_rate != IL_RATE_INVALID) { |
4bc85c13 WYG |
682 | if (rs_sta->start_rate < index && |
683 | (rate_mask & (1 << rs_sta->start_rate))) | |
684 | index = rs_sta->start_rate; | |
e2ebc833 | 685 | rs_sta->start_rate = IL_RATE_INVALID; |
4bc85c13 WYG |
686 | } |
687 | ||
688 | /* force user max rate if set by user */ | |
232913b5 | 689 | if (max_rate_idx != -1 && max_rate_idx < index) { |
4bc85c13 WYG |
690 | if (rate_mask & (1 << max_rate_idx)) |
691 | index = max_rate_idx; | |
692 | } | |
693 | ||
6ce1dc45 | 694 | win = &(rs_sta->win[index]); |
4bc85c13 | 695 | |
6ce1dc45 | 696 | fail_count = win->counter - win->success_counter; |
4bc85c13 | 697 | |
232913b5 | 698 | if (fail_count < IL_RATE_MIN_FAILURE_TH && |
6ce1dc45 | 699 | win->success_counter < IL_RATE_MIN_SUCCESS_TH) { |
4bc85c13 WYG |
700 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
701 | ||
58de00a4 | 702 | D_RATE("Invalid average_tpt on rate %d: " |
4bc85c13 WYG |
703 | "counter: %d, success_counter: %d, " |
704 | "expected_tpt is %sNULL\n", | |
705 | index, | |
6ce1dc45 SG |
706 | win->counter, |
707 | win->success_counter, | |
4bc85c13 WYG |
708 | rs_sta->expected_tpt ? "not " : ""); |
709 | ||
710 | /* Can't calculate this yet; not enough history */ | |
6ce1dc45 | 711 | win->average_tpt = IL_INVALID_VALUE; |
4bc85c13 WYG |
712 | goto out; |
713 | ||
714 | } | |
715 | ||
6ce1dc45 | 716 | current_tpt = win->average_tpt; |
4bc85c13 | 717 | |
e2ebc833 | 718 | high_low = il3945_get_adjacent_rate(rs_sta, index, rate_mask, |
4bc85c13 WYG |
719 | sband->band); |
720 | low = high_low & 0xff; | |
721 | high = (high_low >> 8) & 0xff; | |
722 | ||
723 | /* If user set max rate, dont allow higher than user constrain */ | |
232913b5 | 724 | if (max_rate_idx != -1 && max_rate_idx < high) |
e2ebc833 | 725 | high = IL_RATE_INVALID; |
4bc85c13 WYG |
726 | |
727 | /* Collect Measured throughputs of adjacent rates */ | |
e2ebc833 | 728 | if (low != IL_RATE_INVALID) |
4bc85c13 WYG |
729 | low_tpt = rs_sta->win[low].average_tpt; |
730 | ||
e2ebc833 | 731 | if (high != IL_RATE_INVALID) |
4bc85c13 WYG |
732 | high_tpt = rs_sta->win[high].average_tpt; |
733 | ||
734 | spin_unlock_irqrestore(&rs_sta->lock, flags); | |
735 | ||
736 | scale_action = 0; | |
737 | ||
738 | /* Low success ratio , need to drop the rate */ | |
6ce1dc45 | 739 | if (win->success_ratio < IL_RATE_DECREASE_TH || !current_tpt) { |
58de00a4 | 740 | D_RATE("decrease rate because of low success_ratio\n"); |
4bc85c13 WYG |
741 | scale_action = -1; |
742 | /* No throughput measured yet for adjacent rates, | |
743 | * try increase */ | |
232913b5 SG |
744 | } else if (low_tpt == IL_INVALID_VALUE && |
745 | high_tpt == IL_INVALID_VALUE) { | |
4bc85c13 | 746 | |
6ce1dc45 | 747 | if (high != IL_RATE_INVALID && win->success_ratio >= IL_RATE_INCREASE_TH) |
4bc85c13 | 748 | scale_action = 1; |
e2ebc833 | 749 | else if (low != IL_RATE_INVALID) |
4bc85c13 WYG |
750 | scale_action = 0; |
751 | ||
752 | /* Both adjacent throughputs are measured, but neither one has | |
753 | * better throughput; we're using the best rate, don't change | |
754 | * it! */ | |
232913b5 SG |
755 | } else if (low_tpt != IL_INVALID_VALUE && |
756 | high_tpt != IL_INVALID_VALUE && | |
757 | low_tpt < current_tpt && high_tpt < current_tpt) { | |
4bc85c13 | 758 | |
58de00a4 | 759 | D_RATE("No action -- low [%d] & high [%d] < " |
4bc85c13 WYG |
760 | "current_tpt [%d]\n", |
761 | low_tpt, high_tpt, current_tpt); | |
762 | scale_action = 0; | |
763 | ||
764 | /* At least one of the rates has better throughput */ | |
765 | } else { | |
e2ebc833 | 766 | if (high_tpt != IL_INVALID_VALUE) { |
4bc85c13 WYG |
767 | |
768 | /* High rate has better throughput, Increase | |
769 | * rate */ | |
770 | if (high_tpt > current_tpt && | |
6ce1dc45 | 771 | win->success_ratio >= IL_RATE_INCREASE_TH) |
4bc85c13 WYG |
772 | scale_action = 1; |
773 | else { | |
58de00a4 | 774 | D_RATE( |
4bc85c13 WYG |
775 | "decrease rate because of high tpt\n"); |
776 | scale_action = 0; | |
777 | } | |
e2ebc833 | 778 | } else if (low_tpt != IL_INVALID_VALUE) { |
4bc85c13 | 779 | if (low_tpt > current_tpt) { |
58de00a4 | 780 | D_RATE( |
4bc85c13 WYG |
781 | "decrease rate because of low tpt\n"); |
782 | scale_action = -1; | |
6ce1dc45 | 783 | } else if (win->success_ratio >= IL_RATE_INCREASE_TH) { |
4bc85c13 WYG |
784 | /* Lower rate has better |
785 | * throughput,decrease rate */ | |
786 | scale_action = 1; | |
787 | } | |
788 | } | |
789 | } | |
790 | ||
791 | /* Sanity check; asked for decrease, but success rate or throughput | |
792 | * has been good at old rate. Don't change it. */ | |
232913b5 | 793 | if (scale_action == -1 && low != IL_RATE_INVALID && |
6ce1dc45 | 794 | (win->success_ratio > IL_RATE_HIGH_TH || |
232913b5 | 795 | current_tpt > 100 * rs_sta->expected_tpt[low])) |
4bc85c13 WYG |
796 | scale_action = 0; |
797 | ||
798 | switch (scale_action) { | |
799 | case -1: | |
800 | ||
801 | /* Decrese rate */ | |
e2ebc833 | 802 | if (low != IL_RATE_INVALID) |
4bc85c13 WYG |
803 | index = low; |
804 | break; | |
805 | ||
806 | case 1: | |
807 | /* Increase rate */ | |
e2ebc833 | 808 | if (high != IL_RATE_INVALID) |
4bc85c13 WYG |
809 | index = high; |
810 | ||
811 | break; | |
812 | ||
813 | case 0: | |
814 | default: | |
815 | /* No change */ | |
816 | break; | |
817 | } | |
818 | ||
58de00a4 | 819 | D_RATE("Selected %d (action %d) - low %d high %d\n", |
4bc85c13 WYG |
820 | index, scale_action, low, high); |
821 | ||
822 | out: | |
823 | ||
7c251012 | 824 | if (sband->band == IEEE80211_BAND_5GHZ) { |
e2ebc833 SG |
825 | if (WARN_ON_ONCE(index < IL_FIRST_OFDM_RATE)) |
826 | index = IL_FIRST_OFDM_RATE; | |
7c251012 | 827 | rs_sta->last_txrate_idx = index; |
e2ebc833 | 828 | info->control.rates[0].idx = index - IL_FIRST_OFDM_RATE; |
7c251012 SG |
829 | } else { |
830 | rs_sta->last_txrate_idx = index; | |
4bc85c13 | 831 | info->control.rates[0].idx = rs_sta->last_txrate_idx; |
7c251012 | 832 | } |
4bc85c13 | 833 | |
58de00a4 | 834 | D_RATE("leave: %d\n", index); |
4bc85c13 WYG |
835 | } |
836 | ||
837 | #ifdef CONFIG_MAC80211_DEBUGFS | |
e2ebc833 | 838 | static int il3945_open_file_generic(struct inode *inode, struct file *file) |
4bc85c13 WYG |
839 | { |
840 | file->private_data = inode->i_private; | |
841 | return 0; | |
842 | } | |
843 | ||
e2ebc833 | 844 | static ssize_t il3945_sta_dbgfs_stats_table_read(struct file *file, |
4bc85c13 WYG |
845 | char __user *user_buf, |
846 | size_t count, loff_t *ppos) | |
847 | { | |
848 | char *buff; | |
849 | int desc = 0; | |
850 | int j; | |
851 | ssize_t ret; | |
e2ebc833 | 852 | struct il3945_rs_sta *lq_sta = file->private_data; |
4bc85c13 WYG |
853 | |
854 | buff = kmalloc(1024, GFP_KERNEL); | |
855 | if (!buff) | |
856 | return -ENOMEM; | |
857 | ||
858 | desc += sprintf(buff + desc, "tx packets=%d last rate index=%d\n" | |
859 | "rate=0x%X flush time %d\n", | |
860 | lq_sta->tx_packets, | |
861 | lq_sta->last_txrate_idx, | |
862 | lq_sta->start_rate, jiffies_to_msecs(lq_sta->flush_time)); | |
e2ebc833 | 863 | for (j = 0; j < IL_RATE_COUNT_3945; j++) { |
4bc85c13 WYG |
864 | desc += sprintf(buff+desc, |
865 | "counter=%d success=%d %%=%d\n", | |
866 | lq_sta->win[j].counter, | |
867 | lq_sta->win[j].success_counter, | |
868 | lq_sta->win[j].success_ratio); | |
869 | } | |
870 | ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); | |
871 | kfree(buff); | |
872 | return ret; | |
873 | } | |
874 | ||
875 | static const struct file_operations rs_sta_dbgfs_stats_table_ops = { | |
e2ebc833 SG |
876 | .read = il3945_sta_dbgfs_stats_table_read, |
877 | .open = il3945_open_file_generic, | |
4bc85c13 WYG |
878 | .llseek = default_llseek, |
879 | }; | |
880 | ||
46bc8d4b | 881 | static void il3945_add_debugfs(void *il, void *il_sta, |
4bc85c13 WYG |
882 | struct dentry *dir) |
883 | { | |
46bc8d4b | 884 | struct il3945_rs_sta *lq_sta = il_sta; |
4bc85c13 WYG |
885 | |
886 | lq_sta->rs_sta_dbgfs_stats_table_file = | |
887 | debugfs_create_file("rate_stats_table", 0600, dir, | |
888 | lq_sta, &rs_sta_dbgfs_stats_table_ops); | |
889 | ||
890 | } | |
891 | ||
46bc8d4b | 892 | static void il3945_remove_debugfs(void *il, void *il_sta) |
4bc85c13 | 893 | { |
46bc8d4b | 894 | struct il3945_rs_sta *lq_sta = il_sta; |
4bc85c13 WYG |
895 | debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file); |
896 | } | |
897 | #endif | |
898 | ||
899 | /* | |
900 | * Initialization of rate scaling information is done by driver after | |
901 | * the station is added. Since mac80211 calls this function before a | |
902 | * station is added we ignore it. | |
903 | */ | |
46bc8d4b | 904 | static void il3945_rs_rate_init_stub(void *il_r, |
be663ab6 | 905 | struct ieee80211_supported_band *sband, |
46bc8d4b | 906 | struct ieee80211_sta *sta, void *il_sta) |
4bc85c13 WYG |
907 | { |
908 | } | |
909 | ||
910 | static struct rate_control_ops rs_ops = { | |
911 | .module = NULL, | |
912 | .name = RS_NAME, | |
e2ebc833 SG |
913 | .tx_status = il3945_rs_tx_status, |
914 | .get_rate = il3945_rs_get_rate, | |
915 | .rate_init = il3945_rs_rate_init_stub, | |
916 | .alloc = il3945_rs_alloc, | |
917 | .free = il3945_rs_free, | |
918 | .alloc_sta = il3945_rs_alloc_sta, | |
919 | .free_sta = il3945_rs_free_sta, | |
4bc85c13 | 920 | #ifdef CONFIG_MAC80211_DEBUGFS |
e2ebc833 SG |
921 | .add_sta_debugfs = il3945_add_debugfs, |
922 | .remove_sta_debugfs = il3945_remove_debugfs, | |
4bc85c13 WYG |
923 | #endif |
924 | ||
925 | }; | |
e2ebc833 | 926 | void il3945_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id) |
4bc85c13 | 927 | { |
46bc8d4b | 928 | struct il_priv *il = hw->priv; |
4bc85c13 WYG |
929 | s32 rssi = 0; |
930 | unsigned long flags; | |
e2ebc833 | 931 | struct il3945_rs_sta *rs_sta; |
4bc85c13 | 932 | struct ieee80211_sta *sta; |
e2ebc833 | 933 | struct il3945_sta_priv *psta; |
4bc85c13 | 934 | |
58de00a4 | 935 | D_RATE("enter\n"); |
4bc85c13 WYG |
936 | |
937 | rcu_read_lock(); | |
938 | ||
7c2cde2e | 939 | sta = ieee80211_find_sta(il->ctx.vif, |
46bc8d4b | 940 | il->stations[sta_id].sta.sta.addr); |
4bc85c13 | 941 | if (!sta) { |
58de00a4 | 942 | D_RATE("Unable to find station to initialize rate scaling.\n"); |
4bc85c13 WYG |
943 | rcu_read_unlock(); |
944 | return; | |
945 | } | |
946 | ||
947 | psta = (void *) sta->drv_priv; | |
948 | rs_sta = &psta->rs_sta; | |
949 | ||
950 | spin_lock_irqsave(&rs_sta->lock, flags); | |
951 | ||
952 | rs_sta->tgg = 0; | |
46bc8d4b | 953 | switch (il->band) { |
4bc85c13 WYG |
954 | case IEEE80211_BAND_2GHZ: |
955 | /* TODO: this always does G, not a regression */ | |
7c2cde2e | 956 | if (il->ctx.active.flags & |
4bc85c13 WYG |
957 | RXON_FLG_TGG_PROTECT_MSK) { |
958 | rs_sta->tgg = 1; | |
e2ebc833 | 959 | rs_sta->expected_tpt = il3945_expected_tpt_g_prot; |
4bc85c13 | 960 | } else |
e2ebc833 | 961 | rs_sta->expected_tpt = il3945_expected_tpt_g; |
4bc85c13 WYG |
962 | break; |
963 | ||
964 | case IEEE80211_BAND_5GHZ: | |
e2ebc833 | 965 | rs_sta->expected_tpt = il3945_expected_tpt_a; |
4bc85c13 WYG |
966 | break; |
967 | case IEEE80211_NUM_BANDS: | |
968 | BUG(); | |
969 | break; | |
970 | } | |
971 | ||
972 | spin_unlock_irqrestore(&rs_sta->lock, flags); | |
973 | ||
46bc8d4b | 974 | rssi = il->_3945.last_rx_rssi; |
4bc85c13 | 975 | if (rssi == 0) |
e2ebc833 | 976 | rssi = IL_MIN_RSSI_VAL; |
4bc85c13 | 977 | |
58de00a4 | 978 | D_RATE("Network RSSI: %d\n", rssi); |
4bc85c13 | 979 | |
46bc8d4b | 980 | rs_sta->start_rate = il3945_get_rate_index_by_rssi(rssi, il->band); |
4bc85c13 | 981 | |
58de00a4 | 982 | D_RATE("leave: rssi %d assign rate index: " |
4bc85c13 | 983 | "%d (plcp 0x%x)\n", rssi, rs_sta->start_rate, |
e2ebc833 | 984 | il3945_rates[rs_sta->start_rate].plcp); |
4bc85c13 WYG |
985 | rcu_read_unlock(); |
986 | } | |
987 | ||
e2ebc833 | 988 | int il3945_rate_control_register(void) |
4bc85c13 WYG |
989 | { |
990 | return ieee80211_rate_control_register(&rs_ops); | |
991 | } | |
992 | ||
e2ebc833 | 993 | void il3945_rate_control_unregister(void) |
4bc85c13 WYG |
994 | { |
995 | ieee80211_rate_control_unregister(&rs_ops); | |
996 | } |