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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 | ||
d4459a99 | 39 | #include "commands.h" |
6bbb1370 | 40 | #include "3945.h" |
4bc85c13 WYG |
41 | |
42 | #define RS_NAME "iwl-3945-rs" | |
43 | ||
2eb05816 | 44 | static s32 il3945_expected_tpt_g[RATE_COUNT_3945] = { |
4bc85c13 WYG |
45 | 7, 13, 35, 58, 0, 0, 76, 104, 130, 168, 191, 202 |
46 | }; | |
47 | ||
2eb05816 | 48 | static s32 il3945_expected_tpt_g_prot[RATE_COUNT_3945] = { |
4bc85c13 WYG |
49 | 7, 13, 35, 58, 0, 0, 0, 80, 93, 113, 123, 125 |
50 | }; | |
51 | ||
2eb05816 | 52 | static s32 il3945_expected_tpt_a[RATE_COUNT_3945] = { |
4bc85c13 WYG |
53 | 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186 |
54 | }; | |
55 | ||
2eb05816 | 56 | static s32 il3945_expected_tpt_b[RATE_COUNT_3945] = { |
4bc85c13 WYG |
57 | 7, 13, 35, 58, 0, 0, 0, 0, 0, 0, 0, 0 |
58 | }; | |
59 | ||
e2ebc833 | 60 | struct il3945_tpt_entry { |
4bc85c13 | 61 | s8 min_rssi; |
0c2c8852 | 62 | u8 idx; |
4bc85c13 WYG |
63 | }; |
64 | ||
e2ebc833 | 65 | static struct il3945_tpt_entry il3945_tpt_table_a[] = { |
2d09b062 SG |
66 | {-60, RATE_54M_IDX}, |
67 | {-64, RATE_48M_IDX}, | |
68 | {-72, RATE_36M_IDX}, | |
69 | {-80, RATE_24M_IDX}, | |
70 | {-84, RATE_18M_IDX}, | |
71 | {-85, RATE_12M_IDX}, | |
72 | {-87, RATE_9M_IDX}, | |
73 | {-89, RATE_6M_IDX} | |
4bc85c13 WYG |
74 | }; |
75 | ||
e2ebc833 | 76 | static struct il3945_tpt_entry il3945_tpt_table_g[] = { |
2d09b062 SG |
77 | {-60, RATE_54M_IDX}, |
78 | {-64, RATE_48M_IDX}, | |
79 | {-68, RATE_36M_IDX}, | |
80 | {-80, RATE_24M_IDX}, | |
81 | {-84, RATE_18M_IDX}, | |
82 | {-85, RATE_12M_IDX}, | |
83 | {-86, RATE_11M_IDX}, | |
84 | {-88, RATE_5M_IDX}, | |
85 | {-90, RATE_2M_IDX}, | |
86 | {-92, RATE_1M_IDX} | |
4bc85c13 WYG |
87 | }; |
88 | ||
5d0bef90 | 89 | #define RATE_MAX_WINDOW 62 |
2eb05816 | 90 | #define RATE_FLUSH (3*HZ) |
5d0bef90 SG |
91 | #define RATE_WIN_FLUSH (HZ/2) |
92 | #define IL39_RATE_HIGH_TH 11520 | |
93 | #define IL_SUCCESS_UP_TH 8960 | |
94 | #define IL_SUCCESS_DOWN_TH 10880 | |
95 | #define RATE_MIN_FAILURE_TH 6 | |
96 | #define RATE_MIN_SUCCESS_TH 8 | |
97 | #define RATE_DECREASE_TH 1920 | |
98 | #define RATE_RETRY_TH 15 | |
e2ebc833 | 99 | |
e7392364 SG |
100 | static u8 |
101 | il3945_get_rate_idx_by_rssi(s32 rssi, enum ieee80211_band band) | |
4bc85c13 | 102 | { |
0c2c8852 | 103 | u32 idx = 0; |
4bc85c13 | 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 | 114 | break; |
4bc85c13 | 115 | case IEEE80211_BAND_5GHZ: |
e2ebc833 SG |
116 | tpt_table = il3945_tpt_table_a; |
117 | table_size = ARRAY_SIZE(il3945_tpt_table_a); | |
4bc85c13 | 118 | break; |
4bc85c13 WYG |
119 | default: |
120 | BUG(); | |
121 | break; | |
122 | } | |
123 | ||
0c2c8852 SG |
124 | while (idx < table_size && rssi < tpt_table[idx].min_rssi) |
125 | idx++; | |
4bc85c13 | 126 | |
5d0bef90 | 127 | idx = min(idx, table_size - 1); |
4bc85c13 | 128 | |
0c2c8852 | 129 | return tpt_table[idx].idx; |
4bc85c13 WYG |
130 | } |
131 | ||
e7392364 SG |
132 | static void |
133 | il3945_clear_win(struct il3945_rate_scale_data *win) | |
4bc85c13 | 134 | { |
6ce1dc45 SG |
135 | win->data = 0; |
136 | win->success_counter = 0; | |
137 | win->success_ratio = -1; | |
138 | win->counter = 0; | |
139 | win->average_tpt = IL_INVALID_VALUE; | |
140 | win->stamp = 0; | |
4bc85c13 WYG |
141 | } |
142 | ||
143 | /** | |
6ce1dc45 | 144 | * il3945_rate_scale_flush_wins - flush out the rate scale wins |
4bc85c13 | 145 | * |
6ce1dc45 | 146 | * Returns the number of wins that have gathered data but were |
4bc85c13 WYG |
147 | * not flushed. If there were any that were not flushed, then |
148 | * reschedule the rate flushing routine. | |
149 | */ | |
e7392364 SG |
150 | static int |
151 | 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 | |
2eb05816 | 160 | * and it has been more than RATE_WIN_FLUSH |
ebf0d90d | 161 | * since we flushed, clear out the gathered stats |
4bc85c13 | 162 | */ |
2eb05816 | 163 | for (i = 0; i < RATE_COUNT_3945; i++) { |
4bc85c13 WYG |
164 | if (!rs_sta->win[i].counter) |
165 | continue; | |
166 | ||
167 | spin_lock_irqsave(&rs_sta->lock, flags); | |
e7392364 SG |
168 | if (time_after(jiffies, rs_sta->win[i].stamp + RATE_WIN_FLUSH)) { |
169 | D_RATE("flushing %d samples of rate " "idx %d\n", | |
170 | rs_sta->win[i].counter, i); | |
6ce1dc45 | 171 | il3945_clear_win(&rs_sta->win[i]); |
4bc85c13 WYG |
172 | } else |
173 | unflushed++; | |
174 | spin_unlock_irqrestore(&rs_sta->lock, flags); | |
175 | } | |
176 | ||
177 | return unflushed; | |
178 | } | |
179 | ||
2eb05816 SG |
180 | #define RATE_FLUSH_MAX 5000 /* msec */ |
181 | #define RATE_FLUSH_MIN 50 /* msec */ | |
e2ebc833 | 182 | #define IL_AVERAGE_PACKETS 1500 |
4bc85c13 | 183 | |
e7392364 SG |
184 | static void |
185 | il3945_bg_rate_scale_flush(unsigned long data) | |
4bc85c13 | 186 | { |
e2ebc833 | 187 | struct il3945_rs_sta *rs_sta = (void *)data; |
46bc8d4b | 188 | struct il_priv *il __maybe_unused = rs_sta->il; |
4bc85c13 WYG |
189 | int unflushed = 0; |
190 | unsigned long flags; | |
191 | u32 packet_count, duration, pps; | |
192 | ||
58de00a4 | 193 | D_RATE("enter\n"); |
4bc85c13 | 194 | |
6ce1dc45 | 195 | unflushed = il3945_rate_scale_flush_wins(rs_sta); |
4bc85c13 WYG |
196 | |
197 | spin_lock_irqsave(&rs_sta->lock, flags); | |
198 | ||
199 | /* Number of packets Rx'd since last time this timer ran */ | |
200 | packet_count = (rs_sta->tx_packets - rs_sta->last_tx_packets) + 1; | |
201 | ||
202 | rs_sta->last_tx_packets = rs_sta->tx_packets + 1; | |
203 | ||
204 | if (unflushed) { | |
205 | duration = | |
206 | jiffies_to_msecs(jiffies - rs_sta->last_partial_flush); | |
207 | ||
e7392364 | 208 | D_RATE("Tx'd %d packets in %dms\n", packet_count, duration); |
4bc85c13 WYG |
209 | |
210 | /* Determine packets per second */ | |
211 | if (duration) | |
212 | pps = (packet_count * 1000) / duration; | |
213 | else | |
214 | pps = 0; | |
215 | ||
216 | if (pps) { | |
e2ebc833 | 217 | duration = (IL_AVERAGE_PACKETS * 1000) / pps; |
2eb05816 SG |
218 | if (duration < RATE_FLUSH_MIN) |
219 | duration = RATE_FLUSH_MIN; | |
220 | else if (duration > RATE_FLUSH_MAX) | |
221 | duration = RATE_FLUSH_MAX; | |
4bc85c13 | 222 | } else |
2eb05816 | 223 | duration = RATE_FLUSH_MAX; |
4bc85c13 WYG |
224 | |
225 | rs_sta->flush_time = msecs_to_jiffies(duration); | |
226 | ||
e7392364 SG |
227 | D_RATE("new flush period: %d msec ave %d\n", duration, |
228 | packet_count); | |
4bc85c13 | 229 | |
e7392364 SG |
230 | mod_timer(&rs_sta->rate_scale_flush, |
231 | jiffies + rs_sta->flush_time); | |
4bc85c13 WYG |
232 | |
233 | rs_sta->last_partial_flush = jiffies; | |
234 | } else { | |
2eb05816 | 235 | rs_sta->flush_time = RATE_FLUSH; |
4bc85c13 WYG |
236 | rs_sta->flush_pending = 0; |
237 | } | |
238 | /* If there weren't any unflushed entries, we don't schedule the timer | |
239 | * to run again */ | |
240 | ||
241 | rs_sta->last_flush = jiffies; | |
242 | ||
243 | spin_unlock_irqrestore(&rs_sta->lock, flags); | |
244 | ||
58de00a4 | 245 | D_RATE("leave\n"); |
4bc85c13 WYG |
246 | } |
247 | ||
248 | /** | |
6ce1dc45 | 249 | * il3945_collect_tx_data - Update the success/failure sliding win |
4bc85c13 | 250 | * |
6ce1dc45 SG |
251 | * We keep a sliding win of the last 64 packets transmitted |
252 | * at this rate. win->data contains the bitmask of successful | |
4bc85c13 WYG |
253 | * packets. |
254 | */ | |
e7392364 SG |
255 | static void |
256 | il3945_collect_tx_data(struct il3945_rs_sta *rs_sta, | |
257 | struct il3945_rate_scale_data *win, int success, | |
258 | int retries, int idx) | |
4bc85c13 WYG |
259 | { |
260 | unsigned long flags; | |
261 | s32 fail_count; | |
46bc8d4b | 262 | struct il_priv *il __maybe_unused = rs_sta->il; |
4bc85c13 WYG |
263 | |
264 | if (!retries) { | |
58de00a4 | 265 | D_RATE("leave: retries == 0 -- should be at least 1\n"); |
4bc85c13 WYG |
266 | return; |
267 | } | |
268 | ||
269 | spin_lock_irqsave(&rs_sta->lock, flags); | |
270 | ||
271 | /* | |
272 | * Keep track of only the latest 62 tx frame attempts in this rate's | |
6ce1dc45 SG |
273 | * history win; anything older isn't really relevant any more. |
274 | * If we have filled up the sliding win, drop the oldest attempt; | |
4bc85c13 WYG |
275 | * if the oldest attempt (highest bit in bitmap) shows "success", |
276 | * subtract "1" from the success counter (this is the main reason | |
277 | * we keep these bitmaps!). | |
278 | * */ | |
279 | while (retries > 0) { | |
2eb05816 | 280 | if (win->counter >= RATE_MAX_WINDOW) { |
4bc85c13 WYG |
281 | |
282 | /* remove earliest */ | |
2eb05816 | 283 | win->counter = RATE_MAX_WINDOW - 1; |
4bc85c13 | 284 | |
2eb05816 SG |
285 | if (win->data & (1ULL << (RATE_MAX_WINDOW - 1))) { |
286 | win->data &= ~(1ULL << (RATE_MAX_WINDOW - 1)); | |
6ce1dc45 | 287 | win->success_counter--; |
4bc85c13 WYG |
288 | } |
289 | } | |
290 | ||
291 | /* Increment frames-attempted counter */ | |
6ce1dc45 | 292 | win->counter++; |
4bc85c13 WYG |
293 | |
294 | /* Shift bitmap by one frame (throw away oldest history), | |
295 | * OR in "1", and increment "success" if this | |
296 | * frame was successful. */ | |
6ce1dc45 | 297 | win->data <<= 1; |
4bc85c13 | 298 | if (success > 0) { |
6ce1dc45 SG |
299 | win->success_counter++; |
300 | win->data |= 0x1; | |
4bc85c13 WYG |
301 | success--; |
302 | } | |
303 | ||
304 | retries--; | |
305 | } | |
306 | ||
307 | /* Calculate current success ratio, avoid divide-by-0! */ | |
6ce1dc45 | 308 | if (win->counter > 0) |
e7392364 SG |
309 | win->success_ratio = |
310 | 128 * (100 * win->success_counter) / win->counter; | |
4bc85c13 | 311 | else |
6ce1dc45 | 312 | win->success_ratio = IL_INVALID_VALUE; |
4bc85c13 | 313 | |
6ce1dc45 | 314 | fail_count = win->counter - win->success_counter; |
4bc85c13 WYG |
315 | |
316 | /* Calculate average throughput, if we have enough history. */ | |
2eb05816 SG |
317 | if (fail_count >= RATE_MIN_FAILURE_TH || |
318 | win->success_counter >= RATE_MIN_SUCCESS_TH) | |
e7392364 SG |
319 | win->average_tpt = |
320 | ((win->success_ratio * rs_sta->expected_tpt[idx] + | |
321 | 64) / 128); | |
4bc85c13 | 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); | |
4bc85c13 WYG |
329 | } |
330 | ||
331 | /* | |
332 | * Called after adding a new station to initialize rate scaling | |
333 | */ | |
e7392364 SG |
334 | void |
335 | 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"); |
b16db50a | 345 | if (sta_id == il->hw_params.bcast_id) |
4bc85c13 WYG |
346 | goto out; |
347 | ||
e7392364 | 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 | |
2eb05816 | 354 | rs_sta->start_rate = 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; | |
2eb05816 | 361 | rs_sta->flush_time = 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 | |
2eb05816 | 367 | for (i = 0; i < 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; |
5d0bef90 | 386 | il->_3945.sta_supp_rates <<= IL_FIRST_OFDM_RATE; |
4bc85c13 WYG |
387 | } |
388 | ||
389 | out: | |
46bc8d4b | 390 | il->stations[sta_id].used &= ~IL_STA_UCODE_INPROGRESS; |
4bc85c13 | 391 | |
58de00a4 | 392 | D_INFO("leave\n"); |
4bc85c13 WYG |
393 | } |
394 | ||
e7392364 SG |
395 | static void * |
396 | 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 */ | |
e7392364 SG |
402 | static void |
403 | il3945_rs_free(void *il) | |
4bc85c13 | 404 | { |
4bc85c13 WYG |
405 | } |
406 | ||
e7392364 SG |
407 | static void * |
408 | il3945_rs_alloc_sta(void *il_priv, struct ieee80211_sta *sta, gfp_t gfp) | |
4bc85c13 | 409 | { |
e2ebc833 | 410 | struct il3945_rs_sta *rs_sta; |
e7392364 | 411 | struct il3945_sta_priv *psta = (void *)sta->drv_priv; |
46bc8d4b | 412 | struct il_priv *il __maybe_unused = il_priv; |
4bc85c13 | 413 | |
58de00a4 | 414 | D_RATE("enter\n"); |
4bc85c13 WYG |
415 | |
416 | rs_sta = &psta->rs_sta; | |
417 | ||
418 | spin_lock_init(&rs_sta->lock); | |
419 | init_timer(&rs_sta->rate_scale_flush); | |
420 | ||
58de00a4 | 421 | D_RATE("leave\n"); |
4bc85c13 WYG |
422 | |
423 | return rs_sta; | |
424 | } | |
425 | ||
e7392364 SG |
426 | static void |
427 | il3945_rs_free_sta(void *il_priv, struct ieee80211_sta *sta, void *il_sta) | |
4bc85c13 | 428 | { |
46bc8d4b | 429 | struct il3945_rs_sta *rs_sta = il_sta; |
4bc85c13 WYG |
430 | |
431 | /* | |
e2ebc833 SG |
432 | * Be careful not to use any members of il3945_rs_sta (like trying |
433 | * to use il_priv to print out debugging) since it may not be fully | |
4bc85c13 WYG |
434 | * initialized at this point. |
435 | */ | |
436 | del_timer_sync(&rs_sta->rate_scale_flush); | |
437 | } | |
438 | ||
4bc85c13 | 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 | */ | |
e7392364 SG |
445 | static void |
446 | il3945_rs_tx_status(void *il_rate, struct ieee80211_supported_band *sband, | |
447 | struct ieee80211_sta *sta, void *il_sta, | |
448 | struct sk_buff *skb) | |
4bc85c13 WYG |
449 | { |
450 | s8 retries = 0, current_count; | |
0c2c8852 | 451 | int scale_rate_idx, first_idx, last_idx; |
4bc85c13 | 452 | unsigned long flags; |
46bc8d4b SG |
453 | struct il_priv *il = (struct il_priv *)il_rate; |
454 | struct il3945_rs_sta *rs_sta = il_sta; | |
4bc85c13 WYG |
455 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
456 | ||
58de00a4 | 457 | D_RATE("enter\n"); |
4bc85c13 WYG |
458 | |
459 | retries = info->status.rates[0].count; | |
460 | /* Sanity Check for retries */ | |
2eb05816 SG |
461 | if (retries > RATE_RETRY_TH) |
462 | retries = RATE_RETRY_TH; | |
4bc85c13 | 463 | |
0c2c8852 SG |
464 | first_idx = sband->bitrates[info->status.rates[0].idx].hw_value; |
465 | if (first_idx < 0 || first_idx >= RATE_COUNT_3945) { | |
466 | D_RATE("leave: Rate out of bounds: %d\n", first_idx); | |
4bc85c13 WYG |
467 | return; |
468 | } | |
469 | ||
46bc8d4b | 470 | if (!il_sta) { |
58de00a4 | 471 | D_RATE("leave: No STA il data to update!\n"); |
4bc85c13 WYG |
472 | return; |
473 | } | |
474 | ||
475 | /* Treat uninitialized rate scaling data same as non-existing. */ | |
46bc8d4b | 476 | if (!rs_sta->il) { |
58de00a4 | 477 | D_RATE("leave: STA il data uninitialized!\n"); |
4bc85c13 WYG |
478 | return; |
479 | } | |
480 | ||
4bc85c13 WYG |
481 | rs_sta->tx_packets++; |
482 | ||
0c2c8852 SG |
483 | scale_rate_idx = first_idx; |
484 | last_idx = first_idx; | |
4bc85c13 WYG |
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 | 491 | * |
0c2c8852 | 492 | * On exit from this while loop last_idx indicates the rate |
4bc85c13 WYG |
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 | 498 | current_count = (retries - 1); |
0c2c8852 | 499 | last_idx = scale_rate_idx; |
4bc85c13 | 500 | } else { |
46bc8d4b | 501 | current_count = il->retry_rate; |
e7392364 | 502 | last_idx = il3945_rs_next_rate(il, scale_rate_idx); |
4bc85c13 WYG |
503 | } |
504 | ||
505 | /* Update this rate accounting for as many retries | |
506 | * as was used for it (per current_count) */ | |
e7392364 SG |
507 | il3945_collect_tx_data(rs_sta, &rs_sta->win[scale_rate_idx], 0, |
508 | current_count, scale_rate_idx); | |
509 | D_RATE("Update rate %d for %d retries.\n", scale_rate_idx, | |
510 | current_count); | |
4bc85c13 WYG |
511 | |
512 | retries -= current_count; | |
513 | ||
0c2c8852 | 514 | scale_rate_idx = last_idx; |
4bc85c13 WYG |
515 | } |
516 | ||
0c2c8852 | 517 | /* Update the last idx win with success/failure based on ACK */ |
e7392364 SG |
518 | D_RATE("Update rate %d with %s.\n", last_idx, |
519 | (info->flags & IEEE80211_TX_STAT_ACK) ? "success" : "failure"); | |
520 | il3945_collect_tx_data(rs_sta, &rs_sta->win[last_idx], | |
521 | info->flags & IEEE80211_TX_STAT_ACK, 1, | |
522 | last_idx); | |
4bc85c13 | 523 | |
6ce1dc45 | 524 | /* We updated the rate scale win -- if its been more than |
4bc85c13 WYG |
525 | * flush_time since the last run, schedule the flush |
526 | * again */ | |
527 | spin_lock_irqsave(&rs_sta->lock, flags); | |
528 | ||
529 | if (!rs_sta->flush_pending && | |
e7392364 | 530 | time_after(jiffies, rs_sta->last_flush + rs_sta->flush_time)) { |
4bc85c13 WYG |
531 | |
532 | rs_sta->last_partial_flush = jiffies; | |
533 | rs_sta->flush_pending = 1; | |
534 | mod_timer(&rs_sta->rate_scale_flush, | |
535 | jiffies + rs_sta->flush_time); | |
536 | } | |
537 | ||
538 | spin_unlock_irqrestore(&rs_sta->lock, flags); | |
539 | ||
58de00a4 | 540 | D_RATE("leave\n"); |
4bc85c13 WYG |
541 | } |
542 | ||
e7392364 SG |
543 | static u16 |
544 | il3945_get_adjacent_rate(struct il3945_rs_sta *rs_sta, u8 idx, u16 rate_mask, | |
545 | enum ieee80211_band band) | |
4bc85c13 | 546 | { |
2eb05816 SG |
547 | u8 high = RATE_INVALID; |
548 | u8 low = RATE_INVALID; | |
46bc8d4b | 549 | struct il_priv *il __maybe_unused = rs_sta->il; |
4bc85c13 WYG |
550 | |
551 | /* 802.11A walks to the next literal adjacent rate in | |
552 | * the rate table */ | |
553 | if (unlikely(band == IEEE80211_BAND_5GHZ)) { | |
554 | int i; | |
555 | u32 mask; | |
556 | ||
557 | /* Find the previous rate that is in the rate mask */ | |
0c2c8852 | 558 | i = idx - 1; |
4bc85c13 WYG |
559 | for (mask = (1 << i); i >= 0; i--, mask >>= 1) { |
560 | if (rate_mask & mask) { | |
561 | low = i; | |
562 | break; | |
563 | } | |
564 | } | |
565 | ||
566 | /* Find the next rate that is in the rate mask */ | |
0c2c8852 | 567 | i = idx + 1; |
e7392364 | 568 | for (mask = (1 << i); i < RATE_COUNT_3945; i++, mask <<= 1) { |
4bc85c13 WYG |
569 | if (rate_mask & mask) { |
570 | high = i; | |
571 | break; | |
572 | } | |
573 | } | |
574 | ||
575 | return (high << 8) | low; | |
576 | } | |
577 | ||
0c2c8852 | 578 | low = idx; |
2eb05816 | 579 | while (low != RATE_INVALID) { |
4bc85c13 | 580 | if (rs_sta->tgg) |
e2ebc833 | 581 | low = il3945_rates[low].prev_rs_tgg; |
4bc85c13 | 582 | else |
e2ebc833 | 583 | low = il3945_rates[low].prev_rs; |
2eb05816 | 584 | if (low == RATE_INVALID) |
4bc85c13 WYG |
585 | break; |
586 | if (rate_mask & (1 << low)) | |
587 | break; | |
58de00a4 | 588 | D_RATE("Skipping masked lower rate: %d\n", low); |
4bc85c13 WYG |
589 | } |
590 | ||
0c2c8852 | 591 | high = idx; |
2eb05816 | 592 | while (high != RATE_INVALID) { |
4bc85c13 | 593 | if (rs_sta->tgg) |
e2ebc833 | 594 | high = il3945_rates[high].next_rs_tgg; |
4bc85c13 | 595 | else |
e2ebc833 | 596 | high = il3945_rates[high].next_rs; |
2eb05816 | 597 | if (high == RATE_INVALID) |
4bc85c13 WYG |
598 | break; |
599 | if (rate_mask & (1 << high)) | |
600 | break; | |
58de00a4 | 601 | D_RATE("Skipping masked higher rate: %d\n", high); |
4bc85c13 WYG |
602 | } |
603 | ||
604 | return (high << 8) | low; | |
605 | } | |
606 | ||
607 | /** | |
e2ebc833 | 608 | * il3945_rs_get_rate - find the rate for the requested packet |
4bc85c13 WYG |
609 | * |
610 | * Returns the ieee80211_rate structure allocated by the driver. | |
611 | * | |
612 | * The rate control algorithm has no internal mapping between hw_mode's | |
613 | * rate ordering and the rate ordering used by the rate control algorithm. | |
614 | * | |
615 | * The rate control algorithm uses a single table of rates that goes across | |
616 | * the entire A/B/G spectrum vs. being limited to just one particular | |
617 | * hw_mode. | |
618 | * | |
0c2c8852 | 619 | * As such, we can't convert the idx obtained below into the hw_mode's |
4bc85c13 WYG |
620 | * rate table and must reference the driver allocated rate table |
621 | * | |
622 | */ | |
e7392364 SG |
623 | static void |
624 | il3945_rs_get_rate(void *il_r, struct ieee80211_sta *sta, void *il_sta, | |
625 | struct ieee80211_tx_rate_control *txrc) | |
4bc85c13 WYG |
626 | { |
627 | struct ieee80211_supported_band *sband = txrc->sband; | |
628 | struct sk_buff *skb = txrc->skb; | |
2eb05816 SG |
629 | u8 low = RATE_INVALID; |
630 | u8 high = RATE_INVALID; | |
4bc85c13 | 631 | u16 high_low; |
0c2c8852 | 632 | int idx; |
46bc8d4b | 633 | struct il3945_rs_sta *rs_sta = il_sta; |
6ce1dc45 | 634 | struct il3945_rate_scale_data *win = NULL; |
e2ebc833 SG |
635 | int current_tpt = IL_INVALID_VALUE; |
636 | int low_tpt = IL_INVALID_VALUE; | |
637 | int high_tpt = IL_INVALID_VALUE; | |
4bc85c13 WYG |
638 | u32 fail_count; |
639 | s8 scale_action = 0; | |
640 | unsigned long flags; | |
c3371d64 | 641 | u16 rate_mask; |
4bc85c13 | 642 | s8 max_rate_idx = -1; |
46bc8d4b | 643 | struct il_priv *il __maybe_unused = (struct il_priv *)il_r; |
4bc85c13 WYG |
644 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
645 | ||
58de00a4 | 646 | D_RATE("enter\n"); |
4bc85c13 WYG |
647 | |
648 | /* Treat uninitialized rate scaling data same as non-existing. */ | |
46bc8d4b | 649 | if (rs_sta && !rs_sta->il) { |
58de00a4 | 650 | D_RATE("Rate scaling information not initialized yet.\n"); |
46bc8d4b | 651 | il_sta = NULL; |
4bc85c13 WYG |
652 | } |
653 | ||
46bc8d4b | 654 | if (rate_control_send_low(sta, il_sta, txrc)) |
4bc85c13 WYG |
655 | return; |
656 | ||
657 | rate_mask = sta->supp_rates[sband->band]; | |
658 | ||
659 | /* get user max rate if set */ | |
660 | max_rate_idx = txrc->max_rate_idx; | |
232913b5 | 661 | if (sband->band == IEEE80211_BAND_5GHZ && max_rate_idx != -1) |
e2ebc833 | 662 | max_rate_idx += IL_FIRST_OFDM_RATE; |
2eb05816 | 663 | if (max_rate_idx < 0 || max_rate_idx >= RATE_COUNT) |
4bc85c13 WYG |
664 | max_rate_idx = -1; |
665 | ||
0c2c8852 | 666 | idx = min(rs_sta->last_txrate_idx & 0xffff, RATE_COUNT_3945 - 1); |
4bc85c13 WYG |
667 | |
668 | if (sband->band == IEEE80211_BAND_5GHZ) | |
e2ebc833 | 669 | rate_mask = rate_mask << IL_FIRST_OFDM_RATE; |
4bc85c13 WYG |
670 | |
671 | spin_lock_irqsave(&rs_sta->lock, flags); | |
672 | ||
673 | /* for recent assoc, choose best rate regarding | |
674 | * to rssi value | |
675 | */ | |
2eb05816 | 676 | if (rs_sta->start_rate != RATE_INVALID) { |
0c2c8852 | 677 | if (rs_sta->start_rate < idx && |
e7392364 | 678 | (rate_mask & (1 << rs_sta->start_rate))) |
0c2c8852 | 679 | idx = rs_sta->start_rate; |
2eb05816 | 680 | rs_sta->start_rate = RATE_INVALID; |
4bc85c13 WYG |
681 | } |
682 | ||
683 | /* force user max rate if set by user */ | |
0c2c8852 | 684 | if (max_rate_idx != -1 && max_rate_idx < idx) { |
4bc85c13 | 685 | if (rate_mask & (1 << max_rate_idx)) |
0c2c8852 | 686 | idx = max_rate_idx; |
4bc85c13 WYG |
687 | } |
688 | ||
0c2c8852 | 689 | win = &(rs_sta->win[idx]); |
4bc85c13 | 690 | |
6ce1dc45 | 691 | fail_count = win->counter - win->success_counter; |
4bc85c13 | 692 | |
2eb05816 SG |
693 | if (fail_count < RATE_MIN_FAILURE_TH && |
694 | win->success_counter < RATE_MIN_SUCCESS_TH) { | |
4bc85c13 WYG |
695 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
696 | ||
58de00a4 | 697 | D_RATE("Invalid average_tpt on rate %d: " |
e7392364 SG |
698 | "counter: %d, success_counter: %d, " |
699 | "expected_tpt is %sNULL\n", idx, win->counter, | |
700 | win->success_counter, | |
701 | rs_sta->expected_tpt ? "not " : ""); | |
702 | ||
703 | /* Can't calculate this yet; not enough history */ | |
6ce1dc45 | 704 | win->average_tpt = IL_INVALID_VALUE; |
4bc85c13 WYG |
705 | goto out; |
706 | ||
707 | } | |
708 | ||
6ce1dc45 | 709 | current_tpt = win->average_tpt; |
4bc85c13 | 710 | |
e7392364 SG |
711 | high_low = |
712 | il3945_get_adjacent_rate(rs_sta, idx, rate_mask, sband->band); | |
4bc85c13 WYG |
713 | low = high_low & 0xff; |
714 | high = (high_low >> 8) & 0xff; | |
715 | ||
716 | /* If user set max rate, dont allow higher than user constrain */ | |
232913b5 | 717 | if (max_rate_idx != -1 && max_rate_idx < high) |
2eb05816 | 718 | high = RATE_INVALID; |
4bc85c13 WYG |
719 | |
720 | /* Collect Measured throughputs of adjacent rates */ | |
2eb05816 | 721 | if (low != RATE_INVALID) |
4bc85c13 WYG |
722 | low_tpt = rs_sta->win[low].average_tpt; |
723 | ||
2eb05816 | 724 | if (high != RATE_INVALID) |
4bc85c13 WYG |
725 | high_tpt = rs_sta->win[high].average_tpt; |
726 | ||
727 | spin_unlock_irqrestore(&rs_sta->lock, flags); | |
728 | ||
729 | scale_action = 0; | |
730 | ||
731 | /* Low success ratio , need to drop the rate */ | |
2eb05816 | 732 | if (win->success_ratio < RATE_DECREASE_TH || !current_tpt) { |
58de00a4 | 733 | D_RATE("decrease rate because of low success_ratio\n"); |
4bc85c13 | 734 | scale_action = -1; |
e7392364 SG |
735 | /* No throughput measured yet for adjacent rates, |
736 | * try increase */ | |
737 | } else if (low_tpt == IL_INVALID_VALUE && high_tpt == IL_INVALID_VALUE) { | |
4bc85c13 | 738 | |
e7392364 SG |
739 | if (high != RATE_INVALID && |
740 | win->success_ratio >= RATE_INCREASE_TH) | |
4bc85c13 | 741 | scale_action = 1; |
2eb05816 | 742 | else if (low != RATE_INVALID) |
4bc85c13 WYG |
743 | scale_action = 0; |
744 | ||
e7392364 SG |
745 | /* Both adjacent throughputs are measured, but neither one has |
746 | * better throughput; we're using the best rate, don't change | |
747 | * it! */ | |
748 | } else if (low_tpt != IL_INVALID_VALUE && high_tpt != IL_INVALID_VALUE | |
749 | && low_tpt < current_tpt && high_tpt < current_tpt) { | |
4bc85c13 | 750 | |
58de00a4 | 751 | D_RATE("No action -- low [%d] & high [%d] < " |
e7392364 | 752 | "current_tpt [%d]\n", low_tpt, high_tpt, current_tpt); |
4bc85c13 WYG |
753 | scale_action = 0; |
754 | ||
e7392364 | 755 | /* At least one of the rates has better throughput */ |
4bc85c13 | 756 | } else { |
e2ebc833 | 757 | if (high_tpt != IL_INVALID_VALUE) { |
4bc85c13 WYG |
758 | |
759 | /* High rate has better throughput, Increase | |
760 | * rate */ | |
761 | if (high_tpt > current_tpt && | |
e7392364 | 762 | win->success_ratio >= RATE_INCREASE_TH) |
4bc85c13 WYG |
763 | scale_action = 1; |
764 | else { | |
e7392364 | 765 | D_RATE("decrease rate because of high tpt\n"); |
4bc85c13 WYG |
766 | scale_action = 0; |
767 | } | |
e2ebc833 | 768 | } else if (low_tpt != IL_INVALID_VALUE) { |
4bc85c13 | 769 | if (low_tpt > current_tpt) { |
e7392364 | 770 | D_RATE("decrease rate because of low tpt\n"); |
4bc85c13 | 771 | scale_action = -1; |
2eb05816 | 772 | } else if (win->success_ratio >= RATE_INCREASE_TH) { |
4bc85c13 WYG |
773 | /* Lower rate has better |
774 | * throughput,decrease rate */ | |
775 | scale_action = 1; | |
776 | } | |
777 | } | |
778 | } | |
779 | ||
780 | /* Sanity check; asked for decrease, but success rate or throughput | |
781 | * has been good at old rate. Don't change it. */ | |
2eb05816 SG |
782 | if (scale_action == -1 && low != RATE_INVALID && |
783 | (win->success_ratio > RATE_HIGH_TH || | |
232913b5 | 784 | current_tpt > 100 * rs_sta->expected_tpt[low])) |
4bc85c13 WYG |
785 | scale_action = 0; |
786 | ||
787 | switch (scale_action) { | |
788 | case -1: | |
4bc85c13 | 789 | /* Decrese rate */ |
2eb05816 | 790 | if (low != RATE_INVALID) |
0c2c8852 | 791 | idx = low; |
4bc85c13 | 792 | break; |
4bc85c13 WYG |
793 | case 1: |
794 | /* Increase rate */ | |
2eb05816 | 795 | if (high != RATE_INVALID) |
0c2c8852 | 796 | idx = high; |
4bc85c13 WYG |
797 | |
798 | break; | |
4bc85c13 WYG |
799 | case 0: |
800 | default: | |
801 | /* No change */ | |
802 | break; | |
803 | } | |
804 | ||
e7392364 SG |
805 | D_RATE("Selected %d (action %d) - low %d high %d\n", idx, scale_action, |
806 | low, high); | |
4bc85c13 | 807 | |
e7392364 | 808 | out: |
4bc85c13 | 809 | |
7c251012 | 810 | if (sband->band == IEEE80211_BAND_5GHZ) { |
0c2c8852 SG |
811 | if (WARN_ON_ONCE(idx < IL_FIRST_OFDM_RATE)) |
812 | idx = IL_FIRST_OFDM_RATE; | |
813 | rs_sta->last_txrate_idx = idx; | |
814 | info->control.rates[0].idx = idx - IL_FIRST_OFDM_RATE; | |
7c251012 | 815 | } else { |
0c2c8852 | 816 | rs_sta->last_txrate_idx = idx; |
4bc85c13 | 817 | info->control.rates[0].idx = rs_sta->last_txrate_idx; |
7c251012 | 818 | } |
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, | |
889 | struct ieee80211_sta *sta, void *il_sta) | |
4bc85c13 WYG |
890 | { |
891 | } | |
892 | ||
893 | static struct rate_control_ops rs_ops = { | |
894 | .module = NULL, | |
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 WYG |
948 | break; |
949 | case IEEE80211_NUM_BANDS: | |
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 | } |