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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> | |
4bc85c13 WYG |
28 | #include <linux/skbuff.h> |
29 | #include <linux/slab.h> | |
4bc85c13 WYG |
30 | #include <net/mac80211.h> |
31 | ||
32 | #include <linux/netdevice.h> | |
33 | #include <linux/etherdevice.h> | |
34 | #include <linux/delay.h> | |
35 | ||
36 | #include <linux/workqueue.h> | |
37 | ||
d4459a99 | 38 | #include "commands.h" |
6bbb1370 | 39 | #include "3945.h" |
4bc85c13 WYG |
40 | |
41 | #define RS_NAME "iwl-3945-rs" | |
42 | ||
2eb05816 | 43 | static s32 il3945_expected_tpt_g[RATE_COUNT_3945] = { |
4bc85c13 WYG |
44 | 7, 13, 35, 58, 0, 0, 76, 104, 130, 168, 191, 202 |
45 | }; | |
46 | ||
2eb05816 | 47 | static s32 il3945_expected_tpt_g_prot[RATE_COUNT_3945] = { |
4bc85c13 WYG |
48 | 7, 13, 35, 58, 0, 0, 0, 80, 93, 113, 123, 125 |
49 | }; | |
50 | ||
2eb05816 | 51 | static s32 il3945_expected_tpt_a[RATE_COUNT_3945] = { |
4bc85c13 WYG |
52 | 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186 |
53 | }; | |
54 | ||
2eb05816 | 55 | static s32 il3945_expected_tpt_b[RATE_COUNT_3945] = { |
4bc85c13 WYG |
56 | 7, 13, 35, 58, 0, 0, 0, 0, 0, 0, 0, 0 |
57 | }; | |
58 | ||
e2ebc833 | 59 | struct il3945_tpt_entry { |
4bc85c13 | 60 | s8 min_rssi; |
0c2c8852 | 61 | u8 idx; |
4bc85c13 WYG |
62 | }; |
63 | ||
e2ebc833 | 64 | static struct il3945_tpt_entry il3945_tpt_table_a[] = { |
2d09b062 SG |
65 | {-60, RATE_54M_IDX}, |
66 | {-64, RATE_48M_IDX}, | |
67 | {-72, RATE_36M_IDX}, | |
68 | {-80, RATE_24M_IDX}, | |
69 | {-84, RATE_18M_IDX}, | |
70 | {-85, RATE_12M_IDX}, | |
71 | {-87, RATE_9M_IDX}, | |
72 | {-89, RATE_6M_IDX} | |
4bc85c13 WYG |
73 | }; |
74 | ||
e2ebc833 | 75 | static struct il3945_tpt_entry il3945_tpt_table_g[] = { |
2d09b062 SG |
76 | {-60, RATE_54M_IDX}, |
77 | {-64, RATE_48M_IDX}, | |
78 | {-68, RATE_36M_IDX}, | |
79 | {-80, RATE_24M_IDX}, | |
80 | {-84, RATE_18M_IDX}, | |
81 | {-85, RATE_12M_IDX}, | |
82 | {-86, RATE_11M_IDX}, | |
83 | {-88, RATE_5M_IDX}, | |
84 | {-90, RATE_2M_IDX}, | |
85 | {-92, RATE_1M_IDX} | |
4bc85c13 WYG |
86 | }; |
87 | ||
5d0bef90 | 88 | #define RATE_MAX_WINDOW 62 |
2eb05816 | 89 | #define RATE_FLUSH (3*HZ) |
5d0bef90 SG |
90 | #define RATE_WIN_FLUSH (HZ/2) |
91 | #define IL39_RATE_HIGH_TH 11520 | |
92 | #define IL_SUCCESS_UP_TH 8960 | |
93 | #define IL_SUCCESS_DOWN_TH 10880 | |
94 | #define RATE_MIN_FAILURE_TH 6 | |
95 | #define RATE_MIN_SUCCESS_TH 8 | |
96 | #define RATE_DECREASE_TH 1920 | |
97 | #define RATE_RETRY_TH 15 | |
e2ebc833 | 98 | |
e7392364 SG |
99 | static u8 |
100 | il3945_get_rate_idx_by_rssi(s32 rssi, enum ieee80211_band band) | |
4bc85c13 | 101 | { |
0c2c8852 | 102 | u32 idx = 0; |
4bc85c13 | 103 | u32 table_size = 0; |
e2ebc833 | 104 | struct il3945_tpt_entry *tpt_table = NULL; |
4bc85c13 | 105 | |
232913b5 | 106 | if (rssi < IL_MIN_RSSI_VAL || rssi > IL_MAX_RSSI_VAL) |
e2ebc833 | 107 | rssi = IL_MIN_RSSI_VAL; |
4bc85c13 WYG |
108 | |
109 | switch (band) { | |
110 | case IEEE80211_BAND_2GHZ: | |
e2ebc833 SG |
111 | tpt_table = il3945_tpt_table_g; |
112 | table_size = ARRAY_SIZE(il3945_tpt_table_g); | |
4bc85c13 | 113 | break; |
4bc85c13 | 114 | case IEEE80211_BAND_5GHZ: |
e2ebc833 SG |
115 | tpt_table = il3945_tpt_table_a; |
116 | table_size = ARRAY_SIZE(il3945_tpt_table_a); | |
4bc85c13 | 117 | break; |
4bc85c13 WYG |
118 | default: |
119 | BUG(); | |
120 | break; | |
121 | } | |
122 | ||
0c2c8852 SG |
123 | while (idx < table_size && rssi < tpt_table[idx].min_rssi) |
124 | idx++; | |
4bc85c13 | 125 | |
5d0bef90 | 126 | idx = min(idx, table_size - 1); |
4bc85c13 | 127 | |
0c2c8852 | 128 | return tpt_table[idx].idx; |
4bc85c13 WYG |
129 | } |
130 | ||
e7392364 SG |
131 | static void |
132 | il3945_clear_win(struct il3945_rate_scale_data *win) | |
4bc85c13 | 133 | { |
6ce1dc45 SG |
134 | win->data = 0; |
135 | win->success_counter = 0; | |
136 | win->success_ratio = -1; | |
137 | win->counter = 0; | |
138 | win->average_tpt = IL_INVALID_VALUE; | |
139 | win->stamp = 0; | |
4bc85c13 WYG |
140 | } |
141 | ||
142 | /** | |
6ce1dc45 | 143 | * il3945_rate_scale_flush_wins - flush out the rate scale wins |
4bc85c13 | 144 | * |
6ce1dc45 | 145 | * Returns the number of wins that have gathered data but were |
4bc85c13 WYG |
146 | * not flushed. If there were any that were not flushed, then |
147 | * reschedule the rate flushing routine. | |
148 | */ | |
e7392364 SG |
149 | static int |
150 | il3945_rate_scale_flush_wins(struct il3945_rs_sta *rs_sta) | |
4bc85c13 WYG |
151 | { |
152 | int unflushed = 0; | |
153 | int i; | |
154 | unsigned long flags; | |
46bc8d4b | 155 | struct il_priv *il __maybe_unused = rs_sta->il; |
4bc85c13 WYG |
156 | |
157 | /* | |
158 | * For each rate, if we have collected data on that rate | |
2eb05816 | 159 | * and it has been more than RATE_WIN_FLUSH |
ebf0d90d | 160 | * since we flushed, clear out the gathered stats |
4bc85c13 | 161 | */ |
2eb05816 | 162 | for (i = 0; i < RATE_COUNT_3945; i++) { |
4bc85c13 WYG |
163 | if (!rs_sta->win[i].counter) |
164 | continue; | |
165 | ||
166 | spin_lock_irqsave(&rs_sta->lock, flags); | |
e7392364 SG |
167 | if (time_after(jiffies, rs_sta->win[i].stamp + RATE_WIN_FLUSH)) { |
168 | D_RATE("flushing %d samples of rate " "idx %d\n", | |
169 | rs_sta->win[i].counter, i); | |
6ce1dc45 | 170 | il3945_clear_win(&rs_sta->win[i]); |
4bc85c13 WYG |
171 | } else |
172 | unflushed++; | |
173 | spin_unlock_irqrestore(&rs_sta->lock, flags); | |
174 | } | |
175 | ||
176 | return unflushed; | |
177 | } | |
178 | ||
2eb05816 SG |
179 | #define RATE_FLUSH_MAX 5000 /* msec */ |
180 | #define RATE_FLUSH_MIN 50 /* msec */ | |
e2ebc833 | 181 | #define IL_AVERAGE_PACKETS 1500 |
4bc85c13 | 182 | |
e7392364 SG |
183 | static void |
184 | il3945_bg_rate_scale_flush(unsigned long data) | |
4bc85c13 | 185 | { |
e2ebc833 | 186 | struct il3945_rs_sta *rs_sta = (void *)data; |
46bc8d4b | 187 | struct il_priv *il __maybe_unused = rs_sta->il; |
4bc85c13 WYG |
188 | int unflushed = 0; |
189 | unsigned long flags; | |
190 | u32 packet_count, duration, pps; | |
191 | ||
58de00a4 | 192 | D_RATE("enter\n"); |
4bc85c13 | 193 | |
6ce1dc45 | 194 | unflushed = il3945_rate_scale_flush_wins(rs_sta); |
4bc85c13 WYG |
195 | |
196 | spin_lock_irqsave(&rs_sta->lock, flags); | |
197 | ||
198 | /* Number of packets Rx'd since last time this timer ran */ | |
199 | packet_count = (rs_sta->tx_packets - rs_sta->last_tx_packets) + 1; | |
200 | ||
201 | rs_sta->last_tx_packets = rs_sta->tx_packets + 1; | |
202 | ||
203 | if (unflushed) { | |
204 | duration = | |
205 | jiffies_to_msecs(jiffies - rs_sta->last_partial_flush); | |
206 | ||
e7392364 | 207 | D_RATE("Tx'd %d packets in %dms\n", packet_count, duration); |
4bc85c13 WYG |
208 | |
209 | /* Determine packets per second */ | |
210 | if (duration) | |
211 | pps = (packet_count * 1000) / duration; | |
212 | else | |
213 | pps = 0; | |
214 | ||
215 | if (pps) { | |
e2ebc833 | 216 | duration = (IL_AVERAGE_PACKETS * 1000) / pps; |
2eb05816 SG |
217 | if (duration < RATE_FLUSH_MIN) |
218 | duration = RATE_FLUSH_MIN; | |
219 | else if (duration > RATE_FLUSH_MAX) | |
220 | duration = RATE_FLUSH_MAX; | |
4bc85c13 | 221 | } else |
2eb05816 | 222 | duration = RATE_FLUSH_MAX; |
4bc85c13 WYG |
223 | |
224 | rs_sta->flush_time = msecs_to_jiffies(duration); | |
225 | ||
e7392364 SG |
226 | D_RATE("new flush period: %d msec ave %d\n", duration, |
227 | packet_count); | |
4bc85c13 | 228 | |
e7392364 SG |
229 | mod_timer(&rs_sta->rate_scale_flush, |
230 | jiffies + rs_sta->flush_time); | |
4bc85c13 WYG |
231 | |
232 | rs_sta->last_partial_flush = jiffies; | |
233 | } else { | |
2eb05816 | 234 | rs_sta->flush_time = RATE_FLUSH; |
4bc85c13 WYG |
235 | rs_sta->flush_pending = 0; |
236 | } | |
237 | /* If there weren't any unflushed entries, we don't schedule the timer | |
238 | * to run again */ | |
239 | ||
240 | rs_sta->last_flush = jiffies; | |
241 | ||
242 | spin_unlock_irqrestore(&rs_sta->lock, flags); | |
243 | ||
58de00a4 | 244 | D_RATE("leave\n"); |
4bc85c13 WYG |
245 | } |
246 | ||
247 | /** | |
6ce1dc45 | 248 | * il3945_collect_tx_data - Update the success/failure sliding win |
4bc85c13 | 249 | * |
6ce1dc45 SG |
250 | * We keep a sliding win of the last 64 packets transmitted |
251 | * at this rate. win->data contains the bitmask of successful | |
4bc85c13 WYG |
252 | * packets. |
253 | */ | |
e7392364 SG |
254 | static void |
255 | il3945_collect_tx_data(struct il3945_rs_sta *rs_sta, | |
256 | struct il3945_rate_scale_data *win, int success, | |
257 | int retries, int idx) | |
4bc85c13 WYG |
258 | { |
259 | unsigned long flags; | |
260 | s32 fail_count; | |
46bc8d4b | 261 | struct il_priv *il __maybe_unused = rs_sta->il; |
4bc85c13 WYG |
262 | |
263 | if (!retries) { | |
58de00a4 | 264 | D_RATE("leave: retries == 0 -- should be at least 1\n"); |
4bc85c13 WYG |
265 | return; |
266 | } | |
267 | ||
268 | spin_lock_irqsave(&rs_sta->lock, flags); | |
269 | ||
270 | /* | |
271 | * Keep track of only the latest 62 tx frame attempts in this rate's | |
6ce1dc45 SG |
272 | * history win; anything older isn't really relevant any more. |
273 | * If we have filled up the sliding win, drop the oldest attempt; | |
4bc85c13 WYG |
274 | * if the oldest attempt (highest bit in bitmap) shows "success", |
275 | * subtract "1" from the success counter (this is the main reason | |
276 | * we keep these bitmaps!). | |
277 | * */ | |
278 | while (retries > 0) { | |
2eb05816 | 279 | if (win->counter >= RATE_MAX_WINDOW) { |
4bc85c13 WYG |
280 | |
281 | /* remove earliest */ | |
2eb05816 | 282 | win->counter = RATE_MAX_WINDOW - 1; |
4bc85c13 | 283 | |
2eb05816 SG |
284 | if (win->data & (1ULL << (RATE_MAX_WINDOW - 1))) { |
285 | win->data &= ~(1ULL << (RATE_MAX_WINDOW - 1)); | |
6ce1dc45 | 286 | win->success_counter--; |
4bc85c13 WYG |
287 | } |
288 | } | |
289 | ||
290 | /* Increment frames-attempted counter */ | |
6ce1dc45 | 291 | win->counter++; |
4bc85c13 WYG |
292 | |
293 | /* Shift bitmap by one frame (throw away oldest history), | |
294 | * OR in "1", and increment "success" if this | |
295 | * frame was successful. */ | |
6ce1dc45 | 296 | win->data <<= 1; |
4bc85c13 | 297 | if (success > 0) { |
6ce1dc45 SG |
298 | win->success_counter++; |
299 | win->data |= 0x1; | |
4bc85c13 WYG |
300 | success--; |
301 | } | |
302 | ||
303 | retries--; | |
304 | } | |
305 | ||
306 | /* Calculate current success ratio, avoid divide-by-0! */ | |
6ce1dc45 | 307 | if (win->counter > 0) |
e7392364 SG |
308 | win->success_ratio = |
309 | 128 * (100 * win->success_counter) / win->counter; | |
4bc85c13 | 310 | else |
6ce1dc45 | 311 | win->success_ratio = IL_INVALID_VALUE; |
4bc85c13 | 312 | |
6ce1dc45 | 313 | fail_count = win->counter - win->success_counter; |
4bc85c13 WYG |
314 | |
315 | /* Calculate average throughput, if we have enough history. */ | |
2eb05816 SG |
316 | if (fail_count >= RATE_MIN_FAILURE_TH || |
317 | win->success_counter >= RATE_MIN_SUCCESS_TH) | |
e7392364 SG |
318 | win->average_tpt = |
319 | ((win->success_ratio * rs_sta->expected_tpt[idx] + | |
320 | 64) / 128); | |
4bc85c13 | 321 | else |
6ce1dc45 | 322 | win->average_tpt = IL_INVALID_VALUE; |
4bc85c13 | 323 | |
6ce1dc45 SG |
324 | /* Tag this win as having been updated */ |
325 | win->stamp = jiffies; | |
4bc85c13 WYG |
326 | |
327 | spin_unlock_irqrestore(&rs_sta->lock, flags); | |
4bc85c13 WYG |
328 | } |
329 | ||
330 | /* | |
331 | * Called after adding a new station to initialize rate scaling | |
332 | */ | |
e7392364 SG |
333 | void |
334 | il3945_rs_rate_init(struct il_priv *il, struct ieee80211_sta *sta, u8 sta_id) | |
4bc85c13 | 335 | { |
46bc8d4b SG |
336 | struct ieee80211_hw *hw = il->hw; |
337 | struct ieee80211_conf *conf = &il->hw->conf; | |
e2ebc833 SG |
338 | struct il3945_sta_priv *psta; |
339 | struct il3945_rs_sta *rs_sta; | |
4bc85c13 WYG |
340 | struct ieee80211_supported_band *sband; |
341 | int i; | |
342 | ||
58de00a4 | 343 | D_INFO("enter\n"); |
b16db50a | 344 | if (sta_id == il->hw_params.bcast_id) |
4bc85c13 WYG |
345 | goto out; |
346 | ||
e7392364 | 347 | psta = (struct il3945_sta_priv *)sta->drv_priv; |
4bc85c13 | 348 | rs_sta = &psta->rs_sta; |
675a0b04 | 349 | sband = hw->wiphy->bands[conf->chandef.chan->band]; |
4bc85c13 | 350 | |
46bc8d4b | 351 | rs_sta->il = il; |
4bc85c13 | 352 | |
2eb05816 | 353 | rs_sta->start_rate = RATE_INVALID; |
4bc85c13 WYG |
354 | |
355 | /* default to just 802.11b */ | |
e2ebc833 | 356 | rs_sta->expected_tpt = il3945_expected_tpt_b; |
4bc85c13 WYG |
357 | |
358 | rs_sta->last_partial_flush = jiffies; | |
359 | rs_sta->last_flush = jiffies; | |
2eb05816 | 360 | rs_sta->flush_time = RATE_FLUSH; |
4bc85c13 WYG |
361 | rs_sta->last_tx_packets = 0; |
362 | ||
363 | rs_sta->rate_scale_flush.data = (unsigned long)rs_sta; | |
e2ebc833 | 364 | rs_sta->rate_scale_flush.function = il3945_bg_rate_scale_flush; |
4bc85c13 | 365 | |
2eb05816 | 366 | for (i = 0; i < RATE_COUNT_3945; i++) |
6ce1dc45 | 367 | il3945_clear_win(&rs_sta->win[i]); |
4bc85c13 WYG |
368 | |
369 | /* TODO: what is a good starting rate for STA? About middle? Maybe not | |
370 | * the lowest or the highest rate.. Could consider using RSSI from | |
371 | * previous packets? Need to have IEEE 802.1X auth succeed immediately | |
372 | * after assoc.. */ | |
373 | ||
374 | for (i = sband->n_bitrates - 1; i >= 0; i--) { | |
375 | if (sta->supp_rates[sband->band] & (1 << i)) { | |
376 | rs_sta->last_txrate_idx = i; | |
377 | break; | |
378 | } | |
379 | } | |
380 | ||
46bc8d4b | 381 | il->_3945.sta_supp_rates = sta->supp_rates[sband->band]; |
e2ebc833 | 382 | /* For 5 GHz band it start at IL_FIRST_OFDM_RATE */ |
4bc85c13 | 383 | if (sband->band == IEEE80211_BAND_5GHZ) { |
e2ebc833 | 384 | rs_sta->last_txrate_idx += IL_FIRST_OFDM_RATE; |
5d0bef90 | 385 | il->_3945.sta_supp_rates <<= IL_FIRST_OFDM_RATE; |
4bc85c13 WYG |
386 | } |
387 | ||
388 | out: | |
46bc8d4b | 389 | il->stations[sta_id].used &= ~IL_STA_UCODE_INPROGRESS; |
4bc85c13 | 390 | |
58de00a4 | 391 | D_INFO("leave\n"); |
4bc85c13 WYG |
392 | } |
393 | ||
e7392364 SG |
394 | static void * |
395 | il3945_rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) | |
4bc85c13 WYG |
396 | { |
397 | return hw->priv; | |
398 | } | |
399 | ||
400 | /* rate scale requires free function to be implemented */ | |
e7392364 SG |
401 | static void |
402 | il3945_rs_free(void *il) | |
4bc85c13 | 403 | { |
4bc85c13 WYG |
404 | } |
405 | ||
e7392364 SG |
406 | static void * |
407 | il3945_rs_alloc_sta(void *il_priv, struct ieee80211_sta *sta, gfp_t gfp) | |
4bc85c13 | 408 | { |
e2ebc833 | 409 | struct il3945_rs_sta *rs_sta; |
e7392364 | 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 | ||
e7392364 SG |
425 | static void |
426 | il3945_rs_free_sta(void *il_priv, struct ieee80211_sta *sta, 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 | ||
4bc85c13 | 438 | /** |
e2ebc833 | 439 | * il3945_rs_tx_status - Update rate control values based on Tx results |
4bc85c13 | 440 | * |
e2ebc833 | 441 | * NOTE: Uses il_priv->retry_rate for the # of retries attempted by |
4bc85c13 WYG |
442 | * the hardware for each rate. |
443 | */ | |
e7392364 SG |
444 | static void |
445 | il3945_rs_tx_status(void *il_rate, struct ieee80211_supported_band *sband, | |
446 | struct ieee80211_sta *sta, void *il_sta, | |
447 | struct sk_buff *skb) | |
4bc85c13 WYG |
448 | { |
449 | s8 retries = 0, current_count; | |
0c2c8852 | 450 | int scale_rate_idx, first_idx, last_idx; |
4bc85c13 | 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 */ | |
2eb05816 SG |
460 | if (retries > RATE_RETRY_TH) |
461 | retries = RATE_RETRY_TH; | |
4bc85c13 | 462 | |
0c2c8852 SG |
463 | first_idx = sband->bitrates[info->status.rates[0].idx].hw_value; |
464 | if (first_idx < 0 || first_idx >= RATE_COUNT_3945) { | |
465 | D_RATE("leave: Rate out of bounds: %d\n", first_idx); | |
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 | ||
4bc85c13 WYG |
480 | rs_sta->tx_packets++; |
481 | ||
0c2c8852 SG |
482 | scale_rate_idx = first_idx; |
483 | last_idx = first_idx; | |
4bc85c13 WYG |
484 | |
485 | /* | |
6ce1dc45 | 486 | * Update the win for each rate. We determine which rates |
4bc85c13 WYG |
487 | * were Tx'd based on the total number of retries vs. the number |
488 | * of retries configured for each rate -- currently set to the | |
46bc8d4b | 489 | * il value 'retry_rate' vs. rate specific |
4bc85c13 | 490 | * |
0c2c8852 | 491 | * On exit from this while loop last_idx indicates the rate |
4bc85c13 WYG |
492 | * at which the frame was finally transmitted (or failed if no |
493 | * ACK) | |
494 | */ | |
495 | while (retries > 1) { | |
46bc8d4b | 496 | if ((retries - 1) < il->retry_rate) { |
4bc85c13 | 497 | current_count = (retries - 1); |
0c2c8852 | 498 | last_idx = scale_rate_idx; |
4bc85c13 | 499 | } else { |
46bc8d4b | 500 | current_count = il->retry_rate; |
e7392364 | 501 | last_idx = il3945_rs_next_rate(il, scale_rate_idx); |
4bc85c13 WYG |
502 | } |
503 | ||
504 | /* Update this rate accounting for as many retries | |
505 | * as was used for it (per current_count) */ | |
e7392364 SG |
506 | il3945_collect_tx_data(rs_sta, &rs_sta->win[scale_rate_idx], 0, |
507 | current_count, scale_rate_idx); | |
508 | D_RATE("Update rate %d for %d retries.\n", scale_rate_idx, | |
509 | current_count); | |
4bc85c13 WYG |
510 | |
511 | retries -= current_count; | |
512 | ||
0c2c8852 | 513 | scale_rate_idx = last_idx; |
4bc85c13 WYG |
514 | } |
515 | ||
0c2c8852 | 516 | /* Update the last idx win with success/failure based on ACK */ |
e7392364 SG |
517 | D_RATE("Update rate %d with %s.\n", last_idx, |
518 | (info->flags & IEEE80211_TX_STAT_ACK) ? "success" : "failure"); | |
519 | il3945_collect_tx_data(rs_sta, &rs_sta->win[last_idx], | |
520 | info->flags & IEEE80211_TX_STAT_ACK, 1, | |
521 | last_idx); | |
4bc85c13 | 522 | |
6ce1dc45 | 523 | /* We updated the rate scale win -- if its been more than |
4bc85c13 WYG |
524 | * flush_time since the last run, schedule the flush |
525 | * again */ | |
526 | spin_lock_irqsave(&rs_sta->lock, flags); | |
527 | ||
528 | if (!rs_sta->flush_pending && | |
e7392364 | 529 | time_after(jiffies, rs_sta->last_flush + rs_sta->flush_time)) { |
4bc85c13 WYG |
530 | |
531 | rs_sta->last_partial_flush = jiffies; | |
532 | rs_sta->flush_pending = 1; | |
533 | mod_timer(&rs_sta->rate_scale_flush, | |
534 | jiffies + rs_sta->flush_time); | |
535 | } | |
536 | ||
537 | spin_unlock_irqrestore(&rs_sta->lock, flags); | |
538 | ||
58de00a4 | 539 | D_RATE("leave\n"); |
4bc85c13 WYG |
540 | } |
541 | ||
e7392364 SG |
542 | static u16 |
543 | il3945_get_adjacent_rate(struct il3945_rs_sta *rs_sta, u8 idx, u16 rate_mask, | |
544 | enum ieee80211_band band) | |
4bc85c13 | 545 | { |
2eb05816 SG |
546 | u8 high = RATE_INVALID; |
547 | u8 low = RATE_INVALID; | |
46bc8d4b | 548 | struct il_priv *il __maybe_unused = rs_sta->il; |
4bc85c13 WYG |
549 | |
550 | /* 802.11A walks to the next literal adjacent rate in | |
551 | * the rate table */ | |
552 | if (unlikely(band == IEEE80211_BAND_5GHZ)) { | |
553 | int i; | |
554 | u32 mask; | |
555 | ||
556 | /* Find the previous rate that is in the rate mask */ | |
0c2c8852 | 557 | i = idx - 1; |
4bc85c13 WYG |
558 | for (mask = (1 << i); i >= 0; i--, mask >>= 1) { |
559 | if (rate_mask & mask) { | |
560 | low = i; | |
561 | break; | |
562 | } | |
563 | } | |
564 | ||
565 | /* Find the next rate that is in the rate mask */ | |
0c2c8852 | 566 | i = idx + 1; |
e7392364 | 567 | for (mask = (1 << i); i < RATE_COUNT_3945; i++, mask <<= 1) { |
4bc85c13 WYG |
568 | if (rate_mask & mask) { |
569 | high = i; | |
570 | break; | |
571 | } | |
572 | } | |
573 | ||
574 | return (high << 8) | low; | |
575 | } | |
576 | ||
0c2c8852 | 577 | low = idx; |
2eb05816 | 578 | while (low != RATE_INVALID) { |
4bc85c13 | 579 | if (rs_sta->tgg) |
e2ebc833 | 580 | low = il3945_rates[low].prev_rs_tgg; |
4bc85c13 | 581 | else |
e2ebc833 | 582 | low = il3945_rates[low].prev_rs; |
2eb05816 | 583 | if (low == RATE_INVALID) |
4bc85c13 WYG |
584 | break; |
585 | if (rate_mask & (1 << low)) | |
586 | break; | |
58de00a4 | 587 | D_RATE("Skipping masked lower rate: %d\n", low); |
4bc85c13 WYG |
588 | } |
589 | ||
0c2c8852 | 590 | high = idx; |
2eb05816 | 591 | while (high != RATE_INVALID) { |
4bc85c13 | 592 | if (rs_sta->tgg) |
e2ebc833 | 593 | high = il3945_rates[high].next_rs_tgg; |
4bc85c13 | 594 | else |
e2ebc833 | 595 | high = il3945_rates[high].next_rs; |
2eb05816 | 596 | if (high == RATE_INVALID) |
4bc85c13 WYG |
597 | break; |
598 | if (rate_mask & (1 << high)) | |
599 | break; | |
58de00a4 | 600 | D_RATE("Skipping masked higher rate: %d\n", high); |
4bc85c13 WYG |
601 | } |
602 | ||
603 | return (high << 8) | low; | |
604 | } | |
605 | ||
606 | /** | |
e2ebc833 | 607 | * il3945_rs_get_rate - find the rate for the requested packet |
4bc85c13 WYG |
608 | * |
609 | * Returns the ieee80211_rate structure allocated by the driver. | |
610 | * | |
611 | * The rate control algorithm has no internal mapping between hw_mode's | |
612 | * rate ordering and the rate ordering used by the rate control algorithm. | |
613 | * | |
614 | * The rate control algorithm uses a single table of rates that goes across | |
615 | * the entire A/B/G spectrum vs. being limited to just one particular | |
616 | * hw_mode. | |
617 | * | |
0c2c8852 | 618 | * As such, we can't convert the idx obtained below into the hw_mode's |
4bc85c13 WYG |
619 | * rate table and must reference the driver allocated rate table |
620 | * | |
621 | */ | |
e7392364 SG |
622 | static void |
623 | il3945_rs_get_rate(void *il_r, struct ieee80211_sta *sta, void *il_sta, | |
624 | struct ieee80211_tx_rate_control *txrc) | |
4bc85c13 WYG |
625 | { |
626 | struct ieee80211_supported_band *sband = txrc->sband; | |
627 | struct sk_buff *skb = txrc->skb; | |
2eb05816 SG |
628 | u8 low = RATE_INVALID; |
629 | u8 high = RATE_INVALID; | |
4bc85c13 | 630 | u16 high_low; |
0c2c8852 | 631 | int idx; |
46bc8d4b | 632 | struct il3945_rs_sta *rs_sta = il_sta; |
6ce1dc45 | 633 | struct il3945_rate_scale_data *win = NULL; |
e2ebc833 SG |
634 | int current_tpt = IL_INVALID_VALUE; |
635 | int low_tpt = IL_INVALID_VALUE; | |
636 | int high_tpt = IL_INVALID_VALUE; | |
4bc85c13 WYG |
637 | u32 fail_count; |
638 | s8 scale_action = 0; | |
639 | unsigned long flags; | |
c3371d64 | 640 | u16 rate_mask; |
4bc85c13 | 641 | s8 max_rate_idx = -1; |
46bc8d4b | 642 | struct il_priv *il __maybe_unused = (struct il_priv *)il_r; |
4bc85c13 WYG |
643 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
644 | ||
58de00a4 | 645 | D_RATE("enter\n"); |
4bc85c13 WYG |
646 | |
647 | /* Treat uninitialized rate scaling data same as non-existing. */ | |
46bc8d4b | 648 | if (rs_sta && !rs_sta->il) { |
58de00a4 | 649 | D_RATE("Rate scaling information not initialized yet.\n"); |
46bc8d4b | 650 | il_sta = NULL; |
4bc85c13 WYG |
651 | } |
652 | ||
46bc8d4b | 653 | if (rate_control_send_low(sta, il_sta, txrc)) |
4bc85c13 WYG |
654 | return; |
655 | ||
656 | rate_mask = sta->supp_rates[sband->band]; | |
657 | ||
658 | /* get user max rate if set */ | |
659 | max_rate_idx = txrc->max_rate_idx; | |
232913b5 | 660 | if (sband->band == IEEE80211_BAND_5GHZ && max_rate_idx != -1) |
e2ebc833 | 661 | max_rate_idx += IL_FIRST_OFDM_RATE; |
2eb05816 | 662 | if (max_rate_idx < 0 || max_rate_idx >= RATE_COUNT) |
4bc85c13 WYG |
663 | max_rate_idx = -1; |
664 | ||
0c2c8852 | 665 | idx = min(rs_sta->last_txrate_idx & 0xffff, RATE_COUNT_3945 - 1); |
4bc85c13 WYG |
666 | |
667 | if (sband->band == IEEE80211_BAND_5GHZ) | |
e2ebc833 | 668 | rate_mask = rate_mask << IL_FIRST_OFDM_RATE; |
4bc85c13 WYG |
669 | |
670 | spin_lock_irqsave(&rs_sta->lock, flags); | |
671 | ||
672 | /* for recent assoc, choose best rate regarding | |
673 | * to rssi value | |
674 | */ | |
2eb05816 | 675 | if (rs_sta->start_rate != RATE_INVALID) { |
0c2c8852 | 676 | if (rs_sta->start_rate < idx && |
e7392364 | 677 | (rate_mask & (1 << rs_sta->start_rate))) |
0c2c8852 | 678 | idx = rs_sta->start_rate; |
2eb05816 | 679 | rs_sta->start_rate = RATE_INVALID; |
4bc85c13 WYG |
680 | } |
681 | ||
682 | /* force user max rate if set by user */ | |
0c2c8852 | 683 | if (max_rate_idx != -1 && max_rate_idx < idx) { |
4bc85c13 | 684 | if (rate_mask & (1 << max_rate_idx)) |
0c2c8852 | 685 | idx = max_rate_idx; |
4bc85c13 WYG |
686 | } |
687 | ||
0c2c8852 | 688 | win = &(rs_sta->win[idx]); |
4bc85c13 | 689 | |
6ce1dc45 | 690 | fail_count = win->counter - win->success_counter; |
4bc85c13 | 691 | |
2eb05816 SG |
692 | if (fail_count < RATE_MIN_FAILURE_TH && |
693 | win->success_counter < RATE_MIN_SUCCESS_TH) { | |
4bc85c13 WYG |
694 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
695 | ||
58de00a4 | 696 | D_RATE("Invalid average_tpt on rate %d: " |
e7392364 SG |
697 | "counter: %d, success_counter: %d, " |
698 | "expected_tpt is %sNULL\n", idx, win->counter, | |
699 | win->success_counter, | |
700 | rs_sta->expected_tpt ? "not " : ""); | |
701 | ||
702 | /* Can't calculate this yet; not enough history */ | |
6ce1dc45 | 703 | win->average_tpt = IL_INVALID_VALUE; |
4bc85c13 WYG |
704 | goto out; |
705 | ||
706 | } | |
707 | ||
6ce1dc45 | 708 | current_tpt = win->average_tpt; |
4bc85c13 | 709 | |
e7392364 SG |
710 | high_low = |
711 | il3945_get_adjacent_rate(rs_sta, idx, rate_mask, sband->band); | |
4bc85c13 WYG |
712 | low = high_low & 0xff; |
713 | high = (high_low >> 8) & 0xff; | |
714 | ||
715 | /* If user set max rate, dont allow higher than user constrain */ | |
232913b5 | 716 | if (max_rate_idx != -1 && max_rate_idx < high) |
2eb05816 | 717 | high = RATE_INVALID; |
4bc85c13 WYG |
718 | |
719 | /* Collect Measured throughputs of adjacent rates */ | |
2eb05816 | 720 | if (low != RATE_INVALID) |
4bc85c13 WYG |
721 | low_tpt = rs_sta->win[low].average_tpt; |
722 | ||
2eb05816 | 723 | if (high != RATE_INVALID) |
4bc85c13 WYG |
724 | high_tpt = rs_sta->win[high].average_tpt; |
725 | ||
726 | spin_unlock_irqrestore(&rs_sta->lock, flags); | |
727 | ||
728 | scale_action = 0; | |
729 | ||
730 | /* Low success ratio , need to drop the rate */ | |
2eb05816 | 731 | if (win->success_ratio < RATE_DECREASE_TH || !current_tpt) { |
58de00a4 | 732 | D_RATE("decrease rate because of low success_ratio\n"); |
4bc85c13 | 733 | scale_action = -1; |
e7392364 SG |
734 | /* No throughput measured yet for adjacent rates, |
735 | * try increase */ | |
736 | } else if (low_tpt == IL_INVALID_VALUE && high_tpt == IL_INVALID_VALUE) { | |
4bc85c13 | 737 | |
e7392364 SG |
738 | if (high != RATE_INVALID && |
739 | win->success_ratio >= RATE_INCREASE_TH) | |
4bc85c13 | 740 | scale_action = 1; |
2eb05816 | 741 | else if (low != RATE_INVALID) |
4bc85c13 WYG |
742 | scale_action = 0; |
743 | ||
e7392364 SG |
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 != IL_INVALID_VALUE && high_tpt != IL_INVALID_VALUE | |
748 | && low_tpt < current_tpt && high_tpt < current_tpt) { | |
4bc85c13 | 749 | |
58de00a4 | 750 | D_RATE("No action -- low [%d] & high [%d] < " |
e7392364 | 751 | "current_tpt [%d]\n", low_tpt, high_tpt, current_tpt); |
4bc85c13 WYG |
752 | scale_action = 0; |
753 | ||
e7392364 | 754 | /* At least one of the rates has better throughput */ |
4bc85c13 | 755 | } else { |
e2ebc833 | 756 | if (high_tpt != IL_INVALID_VALUE) { |
4bc85c13 WYG |
757 | |
758 | /* High rate has better throughput, Increase | |
759 | * rate */ | |
760 | if (high_tpt > current_tpt && | |
e7392364 | 761 | win->success_ratio >= RATE_INCREASE_TH) |
4bc85c13 WYG |
762 | scale_action = 1; |
763 | else { | |
e7392364 | 764 | D_RATE("decrease rate because of high tpt\n"); |
4bc85c13 WYG |
765 | scale_action = 0; |
766 | } | |
e2ebc833 | 767 | } else if (low_tpt != IL_INVALID_VALUE) { |
4bc85c13 | 768 | if (low_tpt > current_tpt) { |
e7392364 | 769 | D_RATE("decrease rate because of low tpt\n"); |
4bc85c13 | 770 | scale_action = -1; |
2eb05816 | 771 | } else if (win->success_ratio >= RATE_INCREASE_TH) { |
4bc85c13 WYG |
772 | /* Lower rate has better |
773 | * throughput,decrease rate */ | |
774 | scale_action = 1; | |
775 | } | |
776 | } | |
777 | } | |
778 | ||
779 | /* Sanity check; asked for decrease, but success rate or throughput | |
780 | * has been good at old rate. Don't change it. */ | |
2eb05816 SG |
781 | if (scale_action == -1 && low != RATE_INVALID && |
782 | (win->success_ratio > RATE_HIGH_TH || | |
232913b5 | 783 | current_tpt > 100 * rs_sta->expected_tpt[low])) |
4bc85c13 WYG |
784 | scale_action = 0; |
785 | ||
786 | switch (scale_action) { | |
787 | case -1: | |
4bc85c13 | 788 | /* Decrese rate */ |
2eb05816 | 789 | if (low != RATE_INVALID) |
0c2c8852 | 790 | idx = low; |
4bc85c13 | 791 | break; |
4bc85c13 WYG |
792 | case 1: |
793 | /* Increase rate */ | |
2eb05816 | 794 | if (high != RATE_INVALID) |
0c2c8852 | 795 | idx = high; |
4bc85c13 WYG |
796 | |
797 | break; | |
4bc85c13 WYG |
798 | case 0: |
799 | default: | |
800 | /* No change */ | |
801 | break; | |
802 | } | |
803 | ||
e7392364 SG |
804 | D_RATE("Selected %d (action %d) - low %d high %d\n", idx, scale_action, |
805 | low, high); | |
4bc85c13 | 806 | |
e7392364 | 807 | out: |
4bc85c13 | 808 | |
7c251012 | 809 | if (sband->band == IEEE80211_BAND_5GHZ) { |
0c2c8852 SG |
810 | if (WARN_ON_ONCE(idx < IL_FIRST_OFDM_RATE)) |
811 | idx = IL_FIRST_OFDM_RATE; | |
812 | rs_sta->last_txrate_idx = idx; | |
813 | info->control.rates[0].idx = idx - IL_FIRST_OFDM_RATE; | |
7c251012 | 814 | } else { |
0c2c8852 | 815 | rs_sta->last_txrate_idx = idx; |
4bc85c13 | 816 | info->control.rates[0].idx = rs_sta->last_txrate_idx; |
7c251012 | 817 | } |
a8cf0194 | 818 | info->control.rates[0].count = 1; |
4bc85c13 | 819 | |
0c2c8852 | 820 | D_RATE("leave: %d\n", idx); |
4bc85c13 WYG |
821 | } |
822 | ||
823 | #ifdef CONFIG_MAC80211_DEBUGFS | |
4bc85c13 | 824 | |
e7392364 | 825 | static ssize_t |
1722f8e1 SG |
826 | il3945_sta_dbgfs_stats_table_read(struct file *file, char __user *user_buf, |
827 | size_t count, loff_t *ppos) | |
4bc85c13 WYG |
828 | { |
829 | char *buff; | |
830 | int desc = 0; | |
831 | int j; | |
832 | ssize_t ret; | |
e2ebc833 | 833 | struct il3945_rs_sta *lq_sta = file->private_data; |
4bc85c13 WYG |
834 | |
835 | buff = kmalloc(1024, GFP_KERNEL); | |
836 | if (!buff) | |
837 | return -ENOMEM; | |
838 | ||
e7392364 SG |
839 | desc += |
840 | sprintf(buff + desc, | |
841 | "tx packets=%d last rate idx=%d\n" | |
842 | "rate=0x%X flush time %d\n", lq_sta->tx_packets, | |
843 | lq_sta->last_txrate_idx, lq_sta->start_rate, | |
844 | jiffies_to_msecs(lq_sta->flush_time)); | |
2eb05816 | 845 | for (j = 0; j < RATE_COUNT_3945; j++) { |
e7392364 SG |
846 | desc += |
847 | sprintf(buff + desc, "counter=%d success=%d %%=%d\n", | |
848 | lq_sta->win[j].counter, | |
849 | lq_sta->win[j].success_counter, | |
850 | lq_sta->win[j].success_ratio); | |
4bc85c13 WYG |
851 | } |
852 | ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); | |
853 | kfree(buff); | |
854 | return ret; | |
855 | } | |
856 | ||
857 | static const struct file_operations rs_sta_dbgfs_stats_table_ops = { | |
e2ebc833 | 858 | .read = il3945_sta_dbgfs_stats_table_read, |
234e3405 | 859 | .open = simple_open, |
4bc85c13 WYG |
860 | .llseek = default_llseek, |
861 | }; | |
862 | ||
e7392364 SG |
863 | static void |
864 | il3945_add_debugfs(void *il, void *il_sta, struct dentry *dir) | |
4bc85c13 | 865 | { |
46bc8d4b | 866 | struct il3945_rs_sta *lq_sta = il_sta; |
4bc85c13 WYG |
867 | |
868 | lq_sta->rs_sta_dbgfs_stats_table_file = | |
e7392364 SG |
869 | debugfs_create_file("rate_stats_table", 0600, dir, lq_sta, |
870 | &rs_sta_dbgfs_stats_table_ops); | |
4bc85c13 WYG |
871 | |
872 | } | |
873 | ||
e7392364 SG |
874 | static void |
875 | il3945_remove_debugfs(void *il, void *il_sta) | |
4bc85c13 | 876 | { |
46bc8d4b | 877 | struct il3945_rs_sta *lq_sta = il_sta; |
4bc85c13 WYG |
878 | debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file); |
879 | } | |
880 | #endif | |
881 | ||
882 | /* | |
883 | * Initialization of rate scaling information is done by driver after | |
884 | * the station is added. Since mac80211 calls this function before a | |
885 | * station is added we ignore it. | |
886 | */ | |
e7392364 SG |
887 | static void |
888 | il3945_rs_rate_init_stub(void *il_r, struct ieee80211_supported_band *sband, | |
3de805cf | 889 | struct cfg80211_chan_def *chandef, |
e7392364 | 890 | struct ieee80211_sta *sta, void *il_sta) |
4bc85c13 WYG |
891 | { |
892 | } | |
893 | ||
631ad703 | 894 | static const struct rate_control_ops rs_ops = { |
4bc85c13 | 895 | .name = RS_NAME, |
e2ebc833 SG |
896 | .tx_status = il3945_rs_tx_status, |
897 | .get_rate = il3945_rs_get_rate, | |
898 | .rate_init = il3945_rs_rate_init_stub, | |
899 | .alloc = il3945_rs_alloc, | |
900 | .free = il3945_rs_free, | |
901 | .alloc_sta = il3945_rs_alloc_sta, | |
902 | .free_sta = il3945_rs_free_sta, | |
4bc85c13 | 903 | #ifdef CONFIG_MAC80211_DEBUGFS |
e2ebc833 SG |
904 | .add_sta_debugfs = il3945_add_debugfs, |
905 | .remove_sta_debugfs = il3945_remove_debugfs, | |
4bc85c13 WYG |
906 | #endif |
907 | ||
908 | }; | |
e7392364 SG |
909 | |
910 | void | |
911 | il3945_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id) | |
4bc85c13 | 912 | { |
46bc8d4b | 913 | struct il_priv *il = hw->priv; |
4bc85c13 WYG |
914 | s32 rssi = 0; |
915 | unsigned long flags; | |
e2ebc833 | 916 | struct il3945_rs_sta *rs_sta; |
4bc85c13 | 917 | struct ieee80211_sta *sta; |
e2ebc833 | 918 | struct il3945_sta_priv *psta; |
4bc85c13 | 919 | |
58de00a4 | 920 | D_RATE("enter\n"); |
4bc85c13 WYG |
921 | |
922 | rcu_read_lock(); | |
923 | ||
83007196 | 924 | sta = ieee80211_find_sta(il->vif, il->stations[sta_id].sta.sta.addr); |
4bc85c13 | 925 | if (!sta) { |
58de00a4 | 926 | D_RATE("Unable to find station to initialize rate scaling.\n"); |
4bc85c13 WYG |
927 | rcu_read_unlock(); |
928 | return; | |
929 | } | |
930 | ||
e7392364 | 931 | psta = (void *)sta->drv_priv; |
4bc85c13 WYG |
932 | rs_sta = &psta->rs_sta; |
933 | ||
934 | spin_lock_irqsave(&rs_sta->lock, flags); | |
935 | ||
936 | rs_sta->tgg = 0; | |
46bc8d4b | 937 | switch (il->band) { |
4bc85c13 WYG |
938 | case IEEE80211_BAND_2GHZ: |
939 | /* TODO: this always does G, not a regression */ | |
c8b03958 | 940 | if (il->active.flags & RXON_FLG_TGG_PROTECT_MSK) { |
4bc85c13 | 941 | rs_sta->tgg = 1; |
e2ebc833 | 942 | rs_sta->expected_tpt = il3945_expected_tpt_g_prot; |
4bc85c13 | 943 | } else |
e2ebc833 | 944 | rs_sta->expected_tpt = il3945_expected_tpt_g; |
4bc85c13 | 945 | break; |
4bc85c13 | 946 | case IEEE80211_BAND_5GHZ: |
e2ebc833 | 947 | rs_sta->expected_tpt = il3945_expected_tpt_a; |
4bc85c13 | 948 | break; |
3a0c52a6 | 949 | default: |
4bc85c13 WYG |
950 | BUG(); |
951 | break; | |
952 | } | |
953 | ||
954 | spin_unlock_irqrestore(&rs_sta->lock, flags); | |
955 | ||
46bc8d4b | 956 | rssi = il->_3945.last_rx_rssi; |
4bc85c13 | 957 | if (rssi == 0) |
e2ebc833 | 958 | rssi = IL_MIN_RSSI_VAL; |
4bc85c13 | 959 | |
58de00a4 | 960 | D_RATE("Network RSSI: %d\n", rssi); |
4bc85c13 | 961 | |
0c2c8852 | 962 | rs_sta->start_rate = il3945_get_rate_idx_by_rssi(rssi, il->band); |
4bc85c13 | 963 | |
e7392364 SG |
964 | D_RATE("leave: rssi %d assign rate idx: " "%d (plcp 0x%x)\n", rssi, |
965 | rs_sta->start_rate, il3945_rates[rs_sta->start_rate].plcp); | |
4bc85c13 WYG |
966 | rcu_read_unlock(); |
967 | } | |
968 | ||
e7392364 SG |
969 | int |
970 | il3945_rate_control_register(void) | |
4bc85c13 WYG |
971 | { |
972 | return ieee80211_rate_control_register(&rs_ops); | |
973 | } | |
974 | ||
e7392364 SG |
975 | void |
976 | il3945_rate_control_unregister(void) | |
4bc85c13 WYG |
977 | { |
978 | ieee80211_rate_control_unregister(&rs_ops); | |
979 | } |