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b481de9c ZY |
1 | /****************************************************************************** |
2 | * | |
01f8162a | 3 | * Copyright(c) 2005 - 2009 Intel Corporation. All rights reserved. |
b481de9c ZY |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of version 2 of the GNU General Public License as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA | |
17 | * | |
18 | * The full GNU General Public License is included in this distribution in the | |
19 | * file called LICENSE. | |
20 | * | |
21 | * Contact Information: | |
759ef89f | 22 | * Intel Linux Wireless <ilw@linux.intel.com> |
b481de9c ZY |
23 | * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 |
24 | * | |
25 | *****************************************************************************/ | |
26 | ||
27 | #include <linux/kernel.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/skbuff.h> | |
30 | #include <linux/wireless.h> | |
31 | #include <net/mac80211.h> | |
b481de9c ZY |
32 | |
33 | #include <linux/netdevice.h> | |
34 | #include <linux/etherdevice.h> | |
35 | #include <linux/delay.h> | |
36 | ||
37 | #include <linux/workqueue.h> | |
38 | ||
600c0e11 | 39 | #include "iwl-commands.h" |
5d08cd1d | 40 | #include "iwl-3945.h" |
b481de9c ZY |
41 | |
42 | #define RS_NAME "iwl-3945-rs" | |
43 | ||
bb8c093b | 44 | struct iwl3945_rate_scale_data { |
b481de9c ZY |
45 | u64 data; |
46 | s32 success_counter; | |
47 | s32 success_ratio; | |
48 | s32 counter; | |
49 | s32 average_tpt; | |
50 | unsigned long stamp; | |
51 | }; | |
52 | ||
fa254a68 | 53 | struct iwl3945_rs_sta { |
b481de9c | 54 | spinlock_t lock; |
4a8a4322 | 55 | struct iwl_priv *priv; |
b481de9c ZY |
56 | s32 *expected_tpt; |
57 | unsigned long last_partial_flush; | |
58 | unsigned long last_flush; | |
59 | u32 flush_time; | |
60 | u32 last_tx_packets; | |
61 | u32 tx_packets; | |
62 | u8 tgg; | |
63 | u8 flush_pending; | |
64 | u8 start_rate; | |
65 | u8 ibss_sta_added; | |
66 | struct timer_list rate_scale_flush; | |
d9829a67 | 67 | struct iwl3945_rate_scale_data win[IWL_RATE_COUNT_3945]; |
c30e30e1 AM |
68 | #ifdef CONFIG_MAC80211_DEBUGFS |
69 | struct dentry *rs_sta_dbgfs_stats_table_file; | |
70 | #endif | |
b7e35008 JB |
71 | |
72 | /* used to be in sta_info */ | |
73 | int last_txrate_idx; | |
b481de9c ZY |
74 | }; |
75 | ||
d9829a67 | 76 | static s32 iwl3945_expected_tpt_g[IWL_RATE_COUNT_3945] = { |
14577f23 | 77 | 7, 13, 35, 58, 0, 0, 76, 104, 130, 168, 191, 202 |
b481de9c ZY |
78 | }; |
79 | ||
d9829a67 | 80 | static s32 iwl3945_expected_tpt_g_prot[IWL_RATE_COUNT_3945] = { |
14577f23 | 81 | 7, 13, 35, 58, 0, 0, 0, 80, 93, 113, 123, 125 |
b481de9c ZY |
82 | }; |
83 | ||
d9829a67 | 84 | static s32 iwl3945_expected_tpt_a[IWL_RATE_COUNT_3945] = { |
14577f23 | 85 | 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186 |
b481de9c ZY |
86 | }; |
87 | ||
d9829a67 | 88 | static s32 iwl3945_expected_tpt_b[IWL_RATE_COUNT_3945] = { |
14577f23 | 89 | 7, 13, 35, 58, 0, 0, 0, 0, 0, 0, 0, 0 |
b481de9c ZY |
90 | }; |
91 | ||
bb8c093b | 92 | struct iwl3945_tpt_entry { |
b481de9c ZY |
93 | s8 min_rssi; |
94 | u8 index; | |
95 | }; | |
96 | ||
bb8c093b | 97 | static struct iwl3945_tpt_entry iwl3945_tpt_table_a[] = { |
b481de9c ZY |
98 | {-60, IWL_RATE_54M_INDEX}, |
99 | {-64, IWL_RATE_48M_INDEX}, | |
100 | {-72, IWL_RATE_36M_INDEX}, | |
101 | {-80, IWL_RATE_24M_INDEX}, | |
102 | {-84, IWL_RATE_18M_INDEX}, | |
103 | {-85, IWL_RATE_12M_INDEX}, | |
104 | {-87, IWL_RATE_9M_INDEX}, | |
105 | {-89, IWL_RATE_6M_INDEX} | |
106 | }; | |
107 | ||
bb8c093b | 108 | static struct iwl3945_tpt_entry iwl3945_tpt_table_g[] = { |
b481de9c ZY |
109 | {-60, IWL_RATE_54M_INDEX}, |
110 | {-64, IWL_RATE_48M_INDEX}, | |
111 | {-68, IWL_RATE_36M_INDEX}, | |
112 | {-80, IWL_RATE_24M_INDEX}, | |
113 | {-84, IWL_RATE_18M_INDEX}, | |
114 | {-85, IWL_RATE_12M_INDEX}, | |
115 | {-86, IWL_RATE_11M_INDEX}, | |
116 | {-88, IWL_RATE_5M_INDEX}, | |
117 | {-90, IWL_RATE_2M_INDEX}, | |
118 | {-92, IWL_RATE_1M_INDEX} | |
119 | }; | |
120 | ||
121 | #define IWL_RATE_MAX_WINDOW 62 | |
74221d07 | 122 | #define IWL_RATE_FLUSH (3*HZ) |
b481de9c | 123 | #define IWL_RATE_WIN_FLUSH (HZ/2) |
d9829a67 | 124 | #define IWL39_RATE_HIGH_TH 11520 |
74221d07 AM |
125 | #define IWL_SUCCESS_UP_TH 8960 |
126 | #define IWL_SUCCESS_DOWN_TH 10880 | |
b481de9c ZY |
127 | #define IWL_RATE_MIN_FAILURE_TH 8 |
128 | #define IWL_RATE_MIN_SUCCESS_TH 8 | |
129 | #define IWL_RATE_DECREASE_TH 1920 | |
130 | ||
8318d78a | 131 | static u8 iwl3945_get_rate_index_by_rssi(s32 rssi, enum ieee80211_band band) |
b481de9c ZY |
132 | { |
133 | u32 index = 0; | |
134 | u32 table_size = 0; | |
bb8c093b | 135 | struct iwl3945_tpt_entry *tpt_table = NULL; |
b481de9c ZY |
136 | |
137 | if ((rssi < IWL_MIN_RSSI_VAL) || (rssi > IWL_MAX_RSSI_VAL)) | |
138 | rssi = IWL_MIN_RSSI_VAL; | |
139 | ||
8318d78a JB |
140 | switch (band) { |
141 | case IEEE80211_BAND_2GHZ: | |
bb8c093b CH |
142 | tpt_table = iwl3945_tpt_table_g; |
143 | table_size = ARRAY_SIZE(iwl3945_tpt_table_g); | |
b481de9c ZY |
144 | break; |
145 | ||
8318d78a | 146 | case IEEE80211_BAND_5GHZ: |
bb8c093b CH |
147 | tpt_table = iwl3945_tpt_table_a; |
148 | table_size = ARRAY_SIZE(iwl3945_tpt_table_a); | |
b481de9c ZY |
149 | break; |
150 | ||
151 | default: | |
8318d78a | 152 | BUG(); |
b481de9c ZY |
153 | break; |
154 | } | |
155 | ||
156 | while ((index < table_size) && (rssi < tpt_table[index].min_rssi)) | |
157 | index++; | |
158 | ||
159 | index = min(index, (table_size - 1)); | |
160 | ||
161 | return tpt_table[index].index; | |
162 | } | |
163 | ||
bb8c093b | 164 | static void iwl3945_clear_window(struct iwl3945_rate_scale_data *window) |
b481de9c ZY |
165 | { |
166 | window->data = 0; | |
167 | window->success_counter = 0; | |
28447f3c | 168 | window->success_ratio = -1; |
b481de9c | 169 | window->counter = 0; |
d9829a67 | 170 | window->average_tpt = IWL_INVALID_VALUE; |
b481de9c ZY |
171 | window->stamp = 0; |
172 | } | |
173 | ||
174 | /** | |
bb8c093b | 175 | * iwl3945_rate_scale_flush_windows - flush out the rate scale windows |
b481de9c ZY |
176 | * |
177 | * Returns the number of windows that have gathered data but were | |
178 | * not flushed. If there were any that were not flushed, then | |
179 | * reschedule the rate flushing routine. | |
180 | */ | |
fa254a68 | 181 | static int iwl3945_rate_scale_flush_windows(struct iwl3945_rs_sta *rs_sta) |
b481de9c ZY |
182 | { |
183 | int unflushed = 0; | |
184 | int i; | |
185 | unsigned long flags; | |
4a8a4322 | 186 | struct iwl_priv *priv = rs_sta->priv; |
b481de9c ZY |
187 | |
188 | /* | |
189 | * For each rate, if we have collected data on that rate | |
190 | * and it has been more than IWL_RATE_WIN_FLUSH | |
191 | * since we flushed, clear out the gathered statistics | |
192 | */ | |
d9829a67 | 193 | for (i = 0; i < IWL_RATE_COUNT_3945; i++) { |
fa254a68 | 194 | if (!rs_sta->win[i].counter) |
b481de9c ZY |
195 | continue; |
196 | ||
fa254a68 TW |
197 | spin_lock_irqsave(&rs_sta->lock, flags); |
198 | if (time_after(jiffies, rs_sta->win[i].stamp + | |
b481de9c ZY |
199 | IWL_RATE_WIN_FLUSH)) { |
200 | IWL_DEBUG_RATE("flushing %d samples of rate " | |
201 | "index %d\n", | |
fa254a68 TW |
202 | rs_sta->win[i].counter, i); |
203 | iwl3945_clear_window(&rs_sta->win[i]); | |
b481de9c ZY |
204 | } else |
205 | unflushed++; | |
fa254a68 | 206 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c ZY |
207 | } |
208 | ||
209 | return unflushed; | |
210 | } | |
211 | ||
212 | #define IWL_RATE_FLUSH_MAX 5000 /* msec */ | |
213 | #define IWL_RATE_FLUSH_MIN 50 /* msec */ | |
74221d07 | 214 | #define IWL_AVERAGE_PACKETS 1500 |
b481de9c | 215 | |
bb8c093b | 216 | static void iwl3945_bg_rate_scale_flush(unsigned long data) |
b481de9c | 217 | { |
fa254a68 | 218 | struct iwl3945_rs_sta *rs_sta = (void *)data; |
4a8a4322 | 219 | struct iwl_priv *priv = rs_sta->priv; |
b481de9c ZY |
220 | int unflushed = 0; |
221 | unsigned long flags; | |
222 | u32 packet_count, duration, pps; | |
223 | ||
224 | IWL_DEBUG_RATE("enter\n"); | |
225 | ||
fa254a68 | 226 | unflushed = iwl3945_rate_scale_flush_windows(rs_sta); |
b481de9c | 227 | |
fa254a68 | 228 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 229 | |
b481de9c | 230 | /* Number of packets Rx'd since last time this timer ran */ |
fa254a68 | 231 | packet_count = (rs_sta->tx_packets - rs_sta->last_tx_packets) + 1; |
b481de9c | 232 | |
fa254a68 | 233 | rs_sta->last_tx_packets = rs_sta->tx_packets + 1; |
b481de9c ZY |
234 | |
235 | if (unflushed) { | |
236 | duration = | |
fa254a68 | 237 | jiffies_to_msecs(jiffies - rs_sta->last_partial_flush); |
b481de9c ZY |
238 | |
239 | IWL_DEBUG_RATE("Tx'd %d packets in %dms\n", | |
240 | packet_count, duration); | |
241 | ||
242 | /* Determine packets per second */ | |
243 | if (duration) | |
244 | pps = (packet_count * 1000) / duration; | |
245 | else | |
246 | pps = 0; | |
247 | ||
248 | if (pps) { | |
74221d07 | 249 | duration = (IWL_AVERAGE_PACKETS * 1000) / pps; |
b481de9c ZY |
250 | if (duration < IWL_RATE_FLUSH_MIN) |
251 | duration = IWL_RATE_FLUSH_MIN; | |
74221d07 AM |
252 | else if (duration > IWL_RATE_FLUSH_MAX) |
253 | duration = IWL_RATE_FLUSH_MAX; | |
b481de9c ZY |
254 | } else |
255 | duration = IWL_RATE_FLUSH_MAX; | |
256 | ||
fa254a68 | 257 | rs_sta->flush_time = msecs_to_jiffies(duration); |
b481de9c ZY |
258 | |
259 | IWL_DEBUG_RATE("new flush period: %d msec ave %d\n", | |
260 | duration, packet_count); | |
261 | ||
fa254a68 TW |
262 | mod_timer(&rs_sta->rate_scale_flush, jiffies + |
263 | rs_sta->flush_time); | |
b481de9c | 264 | |
fa254a68 | 265 | rs_sta->last_partial_flush = jiffies; |
74221d07 AM |
266 | } else { |
267 | rs_sta->flush_time = IWL_RATE_FLUSH; | |
268 | rs_sta->flush_pending = 0; | |
b481de9c | 269 | } |
b481de9c ZY |
270 | /* If there weren't any unflushed entries, we don't schedule the timer |
271 | * to run again */ | |
272 | ||
fa254a68 | 273 | rs_sta->last_flush = jiffies; |
b481de9c | 274 | |
fa254a68 | 275 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c ZY |
276 | |
277 | IWL_DEBUG_RATE("leave\n"); | |
278 | } | |
279 | ||
280 | /** | |
bb8c093b | 281 | * iwl3945_collect_tx_data - Update the success/failure sliding window |
b481de9c ZY |
282 | * |
283 | * We keep a sliding window of the last 64 packets transmitted | |
284 | * at this rate. window->data contains the bitmask of successful | |
285 | * packets. | |
286 | */ | |
fa254a68 | 287 | static void iwl3945_collect_tx_data(struct iwl3945_rs_sta *rs_sta, |
bb8c093b | 288 | struct iwl3945_rate_scale_data *window, |
74221d07 | 289 | int success, int retries, int index) |
b481de9c ZY |
290 | { |
291 | unsigned long flags; | |
74221d07 | 292 | s32 fail_count; |
4a8a4322 | 293 | struct iwl_priv *priv = rs_sta->priv; |
b481de9c ZY |
294 | |
295 | if (!retries) { | |
296 | IWL_DEBUG_RATE("leave: retries == 0 -- should be at least 1\n"); | |
297 | return; | |
298 | } | |
299 | ||
74221d07 | 300 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 301 | while (retries--) { |
b481de9c ZY |
302 | |
303 | /* If we have filled up the window then subtract one from the | |
304 | * success counter if the high-bit is counting toward | |
305 | * success */ | |
306 | if (window->counter == IWL_RATE_MAX_WINDOW) { | |
307 | if (window->data & (1ULL << (IWL_RATE_MAX_WINDOW - 1))) | |
308 | window->success_counter--; | |
309 | } else | |
310 | window->counter++; | |
311 | ||
312 | /* Slide the window to the left one bit */ | |
313 | window->data = (window->data << 1); | |
314 | ||
315 | /* If this packet was a success then set the low bit high */ | |
316 | if (success) { | |
317 | window->success_counter++; | |
318 | window->data |= 1; | |
319 | } | |
320 | ||
321 | /* window->counter can't be 0 -- it is either >0 or | |
322 | * IWL_RATE_MAX_WINDOW */ | |
323 | window->success_ratio = 12800 * window->success_counter / | |
324 | window->counter; | |
325 | ||
326 | /* Tag this window as having been updated */ | |
327 | window->stamp = jiffies; | |
328 | ||
b481de9c | 329 | } |
74221d07 AM |
330 | |
331 | fail_count = window->counter - window->success_counter; | |
332 | if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) || | |
333 | (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH)) | |
334 | window->average_tpt = ((window->success_ratio * | |
335 | rs_sta->expected_tpt[index] + 64) / 128); | |
336 | else | |
d9829a67 | 337 | window->average_tpt = IWL_INVALID_VALUE; |
74221d07 AM |
338 | |
339 | spin_unlock_irqrestore(&rs_sta->lock, flags); | |
340 | ||
b481de9c ZY |
341 | } |
342 | ||
7262796a | 343 | static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband, |
4b7679a5 | 344 | struct ieee80211_sta *sta, void *priv_sta) |
b481de9c | 345 | { |
4b7679a5 | 346 | struct iwl3945_rs_sta *rs_sta = priv_sta; |
4a8a4322 | 347 | struct iwl_priv *priv = (struct iwl_priv *)priv_r; |
b481de9c ZY |
348 | int i; |
349 | ||
350 | IWL_DEBUG_RATE("enter\n"); | |
351 | ||
352 | /* TODO: what is a good starting rate for STA? About middle? Maybe not | |
353 | * the lowest or the highest rate.. Could consider using RSSI from | |
354 | * previous packets? Need to have IEEE 802.1X auth succeed immediately | |
355 | * after assoc.. */ | |
356 | ||
7262796a | 357 | for (i = sband->n_bitrates - 1; i >= 0; i--) { |
4b7679a5 | 358 | if (sta->supp_rates[sband->band] & (1 << i)) { |
ae17e986 | 359 | rs_sta->last_txrate_idx = i; |
b481de9c ZY |
360 | break; |
361 | } | |
362 | } | |
363 | ||
7262796a | 364 | priv->sta_supp_rates = sta->supp_rates[sband->band]; |
8318d78a | 365 | /* For 5 GHz band it start at IWL_FIRST_OFDM_RATE */ |
7262796a | 366 | if (sband->band == IEEE80211_BAND_5GHZ) { |
b7e35008 | 367 | rs_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE; |
7262796a AM |
368 | priv->sta_supp_rates = priv->sta_supp_rates << |
369 | IWL_FIRST_OFDM_RATE; | |
370 | } | |
371 | ||
14577f23 | 372 | |
b481de9c ZY |
373 | IWL_DEBUG_RATE("leave\n"); |
374 | } | |
375 | ||
4b7679a5 | 376 | static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) |
b481de9c | 377 | { |
4b7679a5 | 378 | return hw->priv; |
b481de9c ZY |
379 | } |
380 | ||
01ebd063 | 381 | /* rate scale requires free function to be implemented */ |
b481de9c ZY |
382 | static void rs_free(void *priv) |
383 | { | |
384 | return; | |
385 | } | |
4b7679a5 | 386 | |
40b8ec0b | 387 | static void *rs_alloc_sta(void *iwl_priv, struct ieee80211_sta *sta, gfp_t gfp) |
b481de9c | 388 | { |
fa254a68 | 389 | struct iwl3945_rs_sta *rs_sta; |
4b7679a5 | 390 | struct iwl3945_sta_priv *psta = (void *) sta->drv_priv; |
4a8a4322 | 391 | struct iwl_priv *priv = iwl_priv; |
b481de9c ZY |
392 | int i; |
393 | ||
4b7679a5 JB |
394 | /* |
395 | * XXX: If it's using sta->drv_priv anyway, it might | |
396 | * as well just put all the information there. | |
397 | */ | |
398 | ||
b481de9c ZY |
399 | IWL_DEBUG_RATE("enter\n"); |
400 | ||
fa254a68 TW |
401 | rs_sta = kzalloc(sizeof(struct iwl3945_rs_sta), gfp); |
402 | if (!rs_sta) { | |
b481de9c ZY |
403 | IWL_DEBUG_RATE("leave: ENOMEM\n"); |
404 | return NULL; | |
405 | } | |
406 | ||
4b7679a5 JB |
407 | psta->rs_sta = rs_sta; |
408 | ||
fa254a68 | 409 | spin_lock_init(&rs_sta->lock); |
b481de9c | 410 | |
40b8ec0b SO |
411 | rs_sta->priv = priv; |
412 | ||
fa254a68 | 413 | rs_sta->start_rate = IWL_RATE_INVALID; |
b481de9c ZY |
414 | |
415 | /* default to just 802.11b */ | |
fa254a68 | 416 | rs_sta->expected_tpt = iwl3945_expected_tpt_b; |
b481de9c | 417 | |
fa254a68 TW |
418 | rs_sta->last_partial_flush = jiffies; |
419 | rs_sta->last_flush = jiffies; | |
420 | rs_sta->flush_time = IWL_RATE_FLUSH; | |
421 | rs_sta->last_tx_packets = 0; | |
422 | rs_sta->ibss_sta_added = 0; | |
b481de9c | 423 | |
fa254a68 TW |
424 | init_timer(&rs_sta->rate_scale_flush); |
425 | rs_sta->rate_scale_flush.data = (unsigned long)rs_sta; | |
426 | rs_sta->rate_scale_flush.function = &iwl3945_bg_rate_scale_flush; | |
b481de9c | 427 | |
d9829a67 | 428 | for (i = 0; i < IWL_RATE_COUNT_3945; i++) |
fa254a68 | 429 | iwl3945_clear_window(&rs_sta->win[i]); |
b481de9c ZY |
430 | |
431 | IWL_DEBUG_RATE("leave\n"); | |
432 | ||
fa254a68 | 433 | return rs_sta; |
b481de9c ZY |
434 | } |
435 | ||
40b8ec0b | 436 | static void rs_free_sta(void *iwl_priv, struct ieee80211_sta *sta, |
4b7679a5 | 437 | void *priv_sta) |
b481de9c | 438 | { |
4b7679a5 | 439 | struct iwl3945_sta_priv *psta = (void *) sta->drv_priv; |
fa254a68 | 440 | struct iwl3945_rs_sta *rs_sta = priv_sta; |
4a8a4322 | 441 | struct iwl_priv *priv = rs_sta->priv; |
b481de9c | 442 | |
4b7679a5 JB |
443 | psta->rs_sta = NULL; |
444 | ||
b481de9c | 445 | IWL_DEBUG_RATE("enter\n"); |
fa254a68 TW |
446 | del_timer_sync(&rs_sta->rate_scale_flush); |
447 | kfree(rs_sta); | |
b481de9c ZY |
448 | IWL_DEBUG_RATE("leave\n"); |
449 | } | |
450 | ||
14577f23 | 451 | |
b481de9c ZY |
452 | /** |
453 | * rs_tx_status - Update rate control values based on Tx results | |
454 | * | |
4a8a4322 | 455 | * NOTE: Uses iwl_priv->retry_rate for the # of retries attempted by |
b481de9c ZY |
456 | * the hardware for each rate. |
457 | */ | |
4b7679a5 JB |
458 | static void rs_tx_status(void *priv_rate, struct ieee80211_supported_band *sband, |
459 | struct ieee80211_sta *sta, void *priv_sta, | |
e039fa4a | 460 | struct sk_buff *skb) |
b481de9c | 461 | { |
74221d07 | 462 | s8 retries = 0, current_count; |
b481de9c ZY |
463 | int scale_rate_index, first_index, last_index; |
464 | unsigned long flags; | |
4a8a4322 | 465 | struct iwl_priv *priv = (struct iwl_priv *)priv_rate; |
4b7679a5 | 466 | struct iwl3945_rs_sta *rs_sta = priv_sta; |
e039fa4a | 467 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
8318d78a | 468 | |
28447f3c TW |
469 | IWL_DEBUG_RATE("enter\n"); |
470 | ||
74221d07 | 471 | retries = info->status.rates[0].count; |
e6a9854b JB |
472 | |
473 | first_index = sband->bitrates[info->status.rates[0].idx].hw_value; | |
d9829a67 | 474 | if ((first_index < 0) || (first_index >= IWL_RATE_COUNT_3945)) { |
8318d78a | 475 | IWL_DEBUG_RATE("leave: Rate out of bounds: %d\n", first_index); |
b481de9c ZY |
476 | return; |
477 | } | |
478 | ||
4b7679a5 | 479 | if (!priv_sta) { |
b481de9c ZY |
480 | IWL_DEBUG_RATE("leave: No STA priv data to update!\n"); |
481 | return; | |
482 | } | |
483 | ||
fa254a68 | 484 | rs_sta->tx_packets++; |
b481de9c ZY |
485 | |
486 | scale_rate_index = first_index; | |
487 | last_index = first_index; | |
488 | ||
489 | /* | |
490 | * Update the window for each rate. We determine which rates | |
491 | * were Tx'd based on the total number of retries vs. the number | |
492 | * of retries configured for each rate -- currently set to the | |
493 | * priv value 'retry_rate' vs. rate specific | |
494 | * | |
495 | * On exit from this while loop last_index indicates the rate | |
496 | * at which the frame was finally transmitted (or failed if no | |
497 | * ACK) | |
498 | */ | |
74221d07 AM |
499 | while (retries > 1) { |
500 | if ((retries - 1) < priv->retry_rate) { | |
501 | current_count = (retries - 1); | |
b481de9c ZY |
502 | last_index = scale_rate_index; |
503 | } else { | |
504 | current_count = priv->retry_rate; | |
e6a9854b | 505 | last_index = iwl3945_rs_next_rate(priv, |
14577f23 | 506 | scale_rate_index); |
b481de9c ZY |
507 | } |
508 | ||
509 | /* Update this rate accounting for as many retries | |
510 | * as was used for it (per current_count) */ | |
fa254a68 TW |
511 | iwl3945_collect_tx_data(rs_sta, |
512 | &rs_sta->win[scale_rate_index], | |
74221d07 | 513 | 0, current_count, scale_rate_index); |
b481de9c ZY |
514 | IWL_DEBUG_RATE("Update rate %d for %d retries.\n", |
515 | scale_rate_index, current_count); | |
516 | ||
517 | retries -= current_count; | |
518 | ||
74221d07 | 519 | scale_rate_index = last_index; |
b481de9c ZY |
520 | } |
521 | ||
14577f23 | 522 | |
b481de9c ZY |
523 | /* Update the last index window with success/failure based on ACK */ |
524 | IWL_DEBUG_RATE("Update rate %d with %s.\n", | |
525 | last_index, | |
e039fa4a | 526 | (info->flags & IEEE80211_TX_STAT_ACK) ? |
b481de9c | 527 | "success" : "failure"); |
fa254a68 TW |
528 | iwl3945_collect_tx_data(rs_sta, |
529 | &rs_sta->win[last_index], | |
74221d07 | 530 | info->flags & IEEE80211_TX_STAT_ACK, 1, last_index); |
b481de9c ZY |
531 | |
532 | /* We updated the rate scale window -- if its been more than | |
533 | * flush_time since the last run, schedule the flush | |
534 | * again */ | |
fa254a68 | 535 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 536 | |
fa254a68 | 537 | if (!rs_sta->flush_pending && |
74221d07 | 538 | time_after(jiffies, rs_sta->last_flush + |
fa254a68 | 539 | rs_sta->flush_time)) { |
b481de9c | 540 | |
74221d07 | 541 | rs_sta->last_partial_flush = jiffies; |
fa254a68 TW |
542 | rs_sta->flush_pending = 1; |
543 | mod_timer(&rs_sta->rate_scale_flush, | |
544 | jiffies + rs_sta->flush_time); | |
b481de9c ZY |
545 | } |
546 | ||
fa254a68 | 547 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c | 548 | |
b481de9c ZY |
549 | IWL_DEBUG_RATE("leave\n"); |
550 | ||
551 | return; | |
552 | } | |
553 | ||
fa254a68 | 554 | static u16 iwl3945_get_adjacent_rate(struct iwl3945_rs_sta *rs_sta, |
8318d78a | 555 | u8 index, u16 rate_mask, enum ieee80211_band band) |
b481de9c ZY |
556 | { |
557 | u8 high = IWL_RATE_INVALID; | |
558 | u8 low = IWL_RATE_INVALID; | |
4a8a4322 | 559 | struct iwl_priv *priv = rs_sta->priv; |
b481de9c | 560 | |
01ebd063 | 561 | /* 802.11A walks to the next literal adjacent rate in |
b481de9c | 562 | * the rate table */ |
8318d78a | 563 | if (unlikely(band == IEEE80211_BAND_5GHZ)) { |
b481de9c ZY |
564 | int i; |
565 | u32 mask; | |
566 | ||
567 | /* Find the previous rate that is in the rate mask */ | |
568 | i = index - 1; | |
569 | for (mask = (1 << i); i >= 0; i--, mask >>= 1) { | |
570 | if (rate_mask & mask) { | |
571 | low = i; | |
572 | break; | |
573 | } | |
574 | } | |
575 | ||
576 | /* Find the next rate that is in the rate mask */ | |
577 | i = index + 1; | |
d9829a67 SO |
578 | for (mask = (1 << i); i < IWL_RATE_COUNT_3945; |
579 | i++, mask <<= 1) { | |
b481de9c ZY |
580 | if (rate_mask & mask) { |
581 | high = i; | |
582 | break; | |
583 | } | |
584 | } | |
585 | ||
586 | return (high << 8) | low; | |
587 | } | |
588 | ||
589 | low = index; | |
590 | while (low != IWL_RATE_INVALID) { | |
fa254a68 | 591 | if (rs_sta->tgg) |
bb8c093b | 592 | low = iwl3945_rates[low].prev_rs_tgg; |
b481de9c | 593 | else |
bb8c093b | 594 | low = iwl3945_rates[low].prev_rs; |
b481de9c ZY |
595 | if (low == IWL_RATE_INVALID) |
596 | break; | |
597 | if (rate_mask & (1 << low)) | |
598 | break; | |
599 | IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low); | |
600 | } | |
601 | ||
602 | high = index; | |
603 | while (high != IWL_RATE_INVALID) { | |
fa254a68 | 604 | if (rs_sta->tgg) |
bb8c093b | 605 | high = iwl3945_rates[high].next_rs_tgg; |
b481de9c | 606 | else |
bb8c093b | 607 | high = iwl3945_rates[high].next_rs; |
b481de9c ZY |
608 | if (high == IWL_RATE_INVALID) |
609 | break; | |
610 | if (rate_mask & (1 << high)) | |
611 | break; | |
612 | IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high); | |
613 | } | |
614 | ||
615 | return (high << 8) | low; | |
616 | } | |
617 | ||
618 | /** | |
619 | * rs_get_rate - find the rate for the requested packet | |
620 | * | |
621 | * Returns the ieee80211_rate structure allocated by the driver. | |
622 | * | |
623 | * The rate control algorithm has no internal mapping between hw_mode's | |
624 | * rate ordering and the rate ordering used by the rate control algorithm. | |
625 | * | |
626 | * The rate control algorithm uses a single table of rates that goes across | |
627 | * the entire A/B/G spectrum vs. being limited to just one particular | |
628 | * hw_mode. | |
629 | * | |
630 | * As such, we can't convert the index obtained below into the hw_mode's | |
631 | * rate table and must reference the driver allocated rate table | |
632 | * | |
633 | */ | |
e6a9854b JB |
634 | static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, |
635 | void *priv_sta, struct ieee80211_tx_rate_control *txrc) | |
b481de9c | 636 | { |
e6a9854b JB |
637 | struct ieee80211_supported_band *sband = txrc->sband; |
638 | struct sk_buff *skb = txrc->skb; | |
b481de9c ZY |
639 | u8 low = IWL_RATE_INVALID; |
640 | u8 high = IWL_RATE_INVALID; | |
641 | u16 high_low; | |
642 | int index; | |
4b7679a5 | 643 | struct iwl3945_rs_sta *rs_sta = priv_sta; |
bb8c093b | 644 | struct iwl3945_rate_scale_data *window = NULL; |
d9829a67 SO |
645 | int current_tpt = IWL_INVALID_VALUE; |
646 | int low_tpt = IWL_INVALID_VALUE; | |
647 | int high_tpt = IWL_INVALID_VALUE; | |
b481de9c ZY |
648 | u32 fail_count; |
649 | s8 scale_action = 0; | |
650 | unsigned long flags; | |
b481de9c | 651 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
c338ba3c AM |
652 | u16 fc; |
653 | u16 rate_mask = 0; | |
4a8a4322 | 654 | struct iwl_priv *priv = (struct iwl_priv *)priv_r; |
e6a9854b | 655 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
b481de9c ZY |
656 | |
657 | IWL_DEBUG_RATE("enter\n"); | |
658 | ||
c338ba3c AM |
659 | if (sta) |
660 | rate_mask = sta->supp_rates[sband->band]; | |
661 | ||
2bc454b0 MW |
662 | /* Send management frames and broadcast/multicast data using lowest |
663 | * rate. */ | |
664 | fc = le16_to_cpu(hdr->frame_control); | |
665 | if ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA || | |
666 | is_multicast_ether_addr(hdr->addr1) || | |
4b7679a5 | 667 | !sta || !priv_sta) { |
b481de9c | 668 | IWL_DEBUG_RATE("leave: No STA priv data to update!\n"); |
c338ba3c AM |
669 | if (!rate_mask) |
670 | info->control.rates[0].idx = | |
671 | rate_lowest_index(sband, NULL); | |
672 | else | |
673 | info->control.rates[0].idx = | |
674 | rate_lowest_index(sband, sta); | |
1abbe498 | 675 | return; |
b481de9c ZY |
676 | } |
677 | ||
d9829a67 | 678 | index = min(rs_sta->last_txrate_idx & 0xffff, IWL_RATE_COUNT_3945 - 1); |
14577f23 | 679 | |
28447f3c | 680 | if (sband->band == IEEE80211_BAND_5GHZ) |
14577f23 | 681 | rate_mask = rate_mask << IWL_FIRST_OFDM_RATE; |
b481de9c | 682 | |
05c914fe | 683 | if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) && |
fa254a68 | 684 | !rs_sta->ibss_sta_added) { |
bb8c093b | 685 | u8 sta_id = iwl3945_hw_find_station(priv, hdr->addr1); |
b481de9c ZY |
686 | |
687 | if (sta_id == IWL_INVALID_STATION) { | |
e174961c JB |
688 | IWL_DEBUG_RATE("LQ: ADD station %pm\n", |
689 | hdr->addr1); | |
bb8c093b | 690 | sta_id = iwl3945_add_station(priv, |
b481de9c ZY |
691 | hdr->addr1, 0, CMD_ASYNC); |
692 | } | |
693 | if (sta_id != IWL_INVALID_STATION) | |
fa254a68 | 694 | rs_sta->ibss_sta_added = 1; |
b481de9c ZY |
695 | } |
696 | ||
fa254a68 | 697 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 698 | |
74221d07 AM |
699 | /* for recent assoc, choose best rate regarding |
700 | * to rssi value | |
701 | */ | |
fa254a68 | 702 | if (rs_sta->start_rate != IWL_RATE_INVALID) { |
74221d07 AM |
703 | if (rs_sta->start_rate < index && |
704 | (rate_mask & (1 << rs_sta->start_rate))) | |
705 | index = rs_sta->start_rate; | |
fa254a68 | 706 | rs_sta->start_rate = IWL_RATE_INVALID; |
b481de9c ZY |
707 | } |
708 | ||
fa254a68 | 709 | window = &(rs_sta->win[index]); |
b481de9c ZY |
710 | |
711 | fail_count = window->counter - window->success_counter; | |
712 | ||
713 | if (((fail_count <= IWL_RATE_MIN_FAILURE_TH) && | |
714 | (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))) { | |
fa254a68 | 715 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c ZY |
716 | |
717 | IWL_DEBUG_RATE("Invalid average_tpt on rate %d: " | |
718 | "counter: %d, success_counter: %d, " | |
719 | "expected_tpt is %sNULL\n", | |
720 | index, | |
721 | window->counter, | |
722 | window->success_counter, | |
fa254a68 | 723 | rs_sta->expected_tpt ? "not " : ""); |
b481de9c ZY |
724 | goto out; |
725 | ||
726 | } | |
727 | ||
b481de9c ZY |
728 | current_tpt = window->average_tpt; |
729 | ||
fa254a68 | 730 | high_low = iwl3945_get_adjacent_rate(rs_sta, index, rate_mask, |
28447f3c | 731 | sband->band); |
b481de9c ZY |
732 | low = high_low & 0xff; |
733 | high = (high_low >> 8) & 0xff; | |
734 | ||
735 | if (low != IWL_RATE_INVALID) | |
fa254a68 | 736 | low_tpt = rs_sta->win[low].average_tpt; |
b481de9c ZY |
737 | |
738 | if (high != IWL_RATE_INVALID) | |
fa254a68 | 739 | high_tpt = rs_sta->win[high].average_tpt; |
b481de9c | 740 | |
fa254a68 | 741 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c ZY |
742 | |
743 | scale_action = 1; | |
744 | ||
745 | if ((window->success_ratio < IWL_RATE_DECREASE_TH) || !current_tpt) { | |
746 | IWL_DEBUG_RATE("decrease rate because of low success_ratio\n"); | |
747 | scale_action = -1; | |
d9829a67 SO |
748 | } else if ((low_tpt == IWL_INVALID_VALUE) && |
749 | (high_tpt == IWL_INVALID_VALUE)) | |
b481de9c | 750 | scale_action = 1; |
d9829a67 SO |
751 | else if ((low_tpt != IWL_INVALID_VALUE) && |
752 | (high_tpt != IWL_INVALID_VALUE) && | |
28447f3c | 753 | (low_tpt < current_tpt) && (high_tpt < current_tpt)) { |
b481de9c ZY |
754 | IWL_DEBUG_RATE("No action -- low [%d] & high [%d] < " |
755 | "current_tpt [%d]\n", | |
756 | low_tpt, high_tpt, current_tpt); | |
757 | scale_action = 0; | |
758 | } else { | |
d9829a67 | 759 | if (high_tpt != IWL_INVALID_VALUE) { |
b481de9c ZY |
760 | if (high_tpt > current_tpt) |
761 | scale_action = 1; | |
762 | else { | |
763 | IWL_DEBUG_RATE | |
764 | ("decrease rate because of high tpt\n"); | |
765 | scale_action = -1; | |
766 | } | |
d9829a67 | 767 | } else if (low_tpt != IWL_INVALID_VALUE) { |
b481de9c ZY |
768 | if (low_tpt > current_tpt) { |
769 | IWL_DEBUG_RATE | |
770 | ("decrease rate because of low tpt\n"); | |
771 | scale_action = -1; | |
772 | } else | |
773 | scale_action = 1; | |
774 | } | |
775 | } | |
776 | ||
74221d07 AM |
777 | if (scale_action == -1) { |
778 | if (window->success_ratio > IWL_SUCCESS_DOWN_TH) | |
779 | scale_action = 0; | |
780 | } else if (scale_action == 1) { | |
781 | if (window->success_ratio < IWL_SUCCESS_UP_TH) { | |
782 | IWL_DEBUG_RATE("No action -- success_ratio [%d] < " | |
783 | "SUCCESS UP\n", window->success_ratio); | |
784 | scale_action = 0; | |
785 | } | |
b481de9c ZY |
786 | } |
787 | ||
788 | switch (scale_action) { | |
789 | case -1: | |
790 | if (low != IWL_RATE_INVALID) | |
791 | index = low; | |
792 | break; | |
793 | ||
794 | case 1: | |
795 | if (high != IWL_RATE_INVALID) | |
796 | index = high; | |
797 | ||
798 | break; | |
799 | ||
800 | case 0: | |
801 | default: | |
802 | break; | |
803 | } | |
804 | ||
805 | IWL_DEBUG_RATE("Selected %d (action %d) - low %d high %d\n", | |
806 | index, scale_action, low, high); | |
807 | ||
808 | out: | |
809 | ||
b7e35008 | 810 | rs_sta->last_txrate_idx = index; |
28447f3c | 811 | if (sband->band == IEEE80211_BAND_5GHZ) |
e6a9854b JB |
812 | info->control.rates[0].idx = rs_sta->last_txrate_idx - |
813 | IWL_FIRST_OFDM_RATE; | |
14577f23 | 814 | else |
e6a9854b | 815 | info->control.rates[0].idx = rs_sta->last_txrate_idx; |
14577f23 | 816 | |
b481de9c | 817 | IWL_DEBUG_RATE("leave: %d\n", index); |
b481de9c ZY |
818 | } |
819 | ||
c30e30e1 AM |
820 | #ifdef CONFIG_MAC80211_DEBUGFS |
821 | static int iwl3945_open_file_generic(struct inode *inode, struct file *file) | |
822 | { | |
823 | file->private_data = inode->i_private; | |
824 | return 0; | |
825 | } | |
826 | ||
827 | static ssize_t iwl3945_sta_dbgfs_stats_table_read(struct file *file, | |
828 | char __user *user_buf, | |
829 | size_t count, loff_t *ppos) | |
830 | { | |
831 | char buff[1024]; | |
832 | int desc = 0; | |
833 | int j; | |
834 | struct iwl3945_rs_sta *lq_sta = file->private_data; | |
835 | ||
836 | desc += sprintf(buff + desc, "tx packets=%d last rate index=%d\n" | |
837 | "rate=0x%X flush time %d\n", | |
838 | lq_sta->tx_packets, | |
839 | lq_sta->last_txrate_idx, | |
840 | lq_sta->start_rate, jiffies_to_msecs(lq_sta->flush_time)); | |
d9829a67 | 841 | for (j = 0; j < IWL_RATE_COUNT_3945; j++) { |
c30e30e1 AM |
842 | desc += sprintf(buff+desc, |
843 | "counter=%d success=%d %%=%d\n", | |
844 | lq_sta->win[j].counter, | |
845 | lq_sta->win[j].success_counter, | |
846 | lq_sta->win[j].success_ratio); | |
847 | } | |
848 | return simple_read_from_buffer(user_buf, count, ppos, buff, desc); | |
849 | } | |
850 | ||
851 | static const struct file_operations rs_sta_dbgfs_stats_table_ops = { | |
852 | .read = iwl3945_sta_dbgfs_stats_table_read, | |
853 | .open = iwl3945_open_file_generic, | |
854 | }; | |
855 | ||
856 | static void iwl3945_add_debugfs(void *priv, void *priv_sta, | |
857 | struct dentry *dir) | |
858 | { | |
859 | struct iwl3945_rs_sta *lq_sta = priv_sta; | |
860 | ||
861 | lq_sta->rs_sta_dbgfs_stats_table_file = | |
862 | debugfs_create_file("rate_stats_table", 0600, dir, | |
863 | lq_sta, &rs_sta_dbgfs_stats_table_ops); | |
864 | ||
865 | } | |
866 | ||
867 | static void iwl3945_remove_debugfs(void *priv, void *priv_sta) | |
868 | { | |
869 | struct iwl3945_rs_sta *lq_sta = priv_sta; | |
870 | debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file); | |
871 | } | |
872 | #endif | |
873 | ||
b481de9c ZY |
874 | static struct rate_control_ops rs_ops = { |
875 | .module = NULL, | |
876 | .name = RS_NAME, | |
877 | .tx_status = rs_tx_status, | |
878 | .get_rate = rs_get_rate, | |
879 | .rate_init = rs_rate_init, | |
b481de9c ZY |
880 | .alloc = rs_alloc, |
881 | .free = rs_free, | |
882 | .alloc_sta = rs_alloc_sta, | |
883 | .free_sta = rs_free_sta, | |
c30e30e1 AM |
884 | #ifdef CONFIG_MAC80211_DEBUGFS |
885 | .add_sta_debugfs = iwl3945_add_debugfs, | |
886 | .remove_sta_debugfs = iwl3945_remove_debugfs, | |
887 | #endif | |
888 | ||
b481de9c ZY |
889 | }; |
890 | ||
bb8c093b | 891 | void iwl3945_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id) |
b481de9c | 892 | { |
4a8a4322 | 893 | struct iwl_priv *priv = hw->priv; |
b481de9c ZY |
894 | s32 rssi = 0; |
895 | unsigned long flags; | |
fa254a68 | 896 | struct iwl3945_rs_sta *rs_sta; |
4b7679a5 JB |
897 | struct ieee80211_sta *sta; |
898 | struct iwl3945_sta_priv *psta; | |
b481de9c ZY |
899 | |
900 | IWL_DEBUG_RATE("enter\n"); | |
901 | ||
d0709a65 JB |
902 | rcu_read_lock(); |
903 | ||
f2c7e521 | 904 | sta = ieee80211_find_sta(hw, priv->stations_39[sta_id].sta.sta.addr); |
52518189 | 905 | if (!sta) { |
d0709a65 | 906 | rcu_read_unlock(); |
b481de9c ZY |
907 | return; |
908 | } | |
909 | ||
52518189 | 910 | psta = (void *) sta->drv_priv; |
4b7679a5 | 911 | rs_sta = psta->rs_sta; |
b481de9c | 912 | |
fa254a68 | 913 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 914 | |
fa254a68 | 915 | rs_sta->tgg = 0; |
8318d78a JB |
916 | switch (priv->band) { |
917 | case IEEE80211_BAND_2GHZ: | |
918 | /* TODO: this always does G, not a regression */ | |
f2c7e521 | 919 | if (priv->active39_rxon.flags & RXON_FLG_TGG_PROTECT_MSK) { |
fa254a68 TW |
920 | rs_sta->tgg = 1; |
921 | rs_sta->expected_tpt = iwl3945_expected_tpt_g_prot; | |
b481de9c | 922 | } else |
fa254a68 | 923 | rs_sta->expected_tpt = iwl3945_expected_tpt_g; |
b481de9c ZY |
924 | break; |
925 | ||
8318d78a | 926 | case IEEE80211_BAND_5GHZ: |
fa254a68 | 927 | rs_sta->expected_tpt = iwl3945_expected_tpt_a; |
b481de9c | 928 | break; |
8318d78a JB |
929 | case IEEE80211_NUM_BANDS: |
930 | BUG(); | |
b481de9c ZY |
931 | break; |
932 | } | |
933 | ||
fa254a68 | 934 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c ZY |
935 | |
936 | rssi = priv->last_rx_rssi; | |
937 | if (rssi == 0) | |
938 | rssi = IWL_MIN_RSSI_VAL; | |
939 | ||
940 | IWL_DEBUG(IWL_DL_INFO | IWL_DL_RATE, "Network RSSI: %d\n", rssi); | |
941 | ||
8318d78a | 942 | rs_sta->start_rate = iwl3945_get_rate_index_by_rssi(rssi, priv->band); |
b481de9c ZY |
943 | |
944 | IWL_DEBUG_RATE("leave: rssi %d assign rate index: " | |
fa254a68 TW |
945 | "%d (plcp 0x%x)\n", rssi, rs_sta->start_rate, |
946 | iwl3945_rates[rs_sta->start_rate].plcp); | |
52518189 | 947 | rcu_read_unlock(); |
b481de9c ZY |
948 | } |
949 | ||
897e1cf2 | 950 | int iwl3945_rate_control_register(void) |
b481de9c | 951 | { |
897e1cf2 | 952 | return ieee80211_rate_control_register(&rs_ops); |
b481de9c ZY |
953 | } |
954 | ||
897e1cf2 | 955 | void iwl3945_rate_control_unregister(void) |
b481de9c ZY |
956 | { |
957 | ieee80211_rate_control_unregister(&rs_ops); | |
958 | } | |
959 | ||
960 |