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b481de9c ZY |
1 | /****************************************************************************** |
2 | * | |
eb7ae89c | 3 | * Copyright(c) 2005 - 2008 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: | |
22 | * James P. Ketrenos <ipw2100-admin@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/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 | ||
2c8dccc7 | 39 | #include "../net/mac80211/rate.h" |
b481de9c | 40 | |
5d08cd1d | 41 | #include "iwl-3945.h" |
b481de9c ZY |
42 | |
43 | #define RS_NAME "iwl-3945-rs" | |
44 | ||
bb8c093b | 45 | struct iwl3945_rate_scale_data { |
b481de9c ZY |
46 | u64 data; |
47 | s32 success_counter; | |
48 | s32 success_ratio; | |
49 | s32 counter; | |
50 | s32 average_tpt; | |
51 | unsigned long stamp; | |
52 | }; | |
53 | ||
fa254a68 | 54 | struct iwl3945_rs_sta { |
b481de9c ZY |
55 | spinlock_t lock; |
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; | |
bb8c093b | 67 | struct iwl3945_rate_scale_data win[IWL_RATE_COUNT]; |
b7e35008 JB |
68 | |
69 | /* used to be in sta_info */ | |
70 | int last_txrate_idx; | |
b481de9c ZY |
71 | }; |
72 | ||
bb8c093b | 73 | static s32 iwl3945_expected_tpt_g[IWL_RATE_COUNT] = { |
14577f23 | 74 | 7, 13, 35, 58, 0, 0, 76, 104, 130, 168, 191, 202 |
b481de9c ZY |
75 | }; |
76 | ||
bb8c093b | 77 | static s32 iwl3945_expected_tpt_g_prot[IWL_RATE_COUNT] = { |
14577f23 | 78 | 7, 13, 35, 58, 0, 0, 0, 80, 93, 113, 123, 125 |
b481de9c ZY |
79 | }; |
80 | ||
bb8c093b | 81 | static s32 iwl3945_expected_tpt_a[IWL_RATE_COUNT] = { |
14577f23 | 82 | 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186 |
b481de9c ZY |
83 | }; |
84 | ||
bb8c093b | 85 | static s32 iwl3945_expected_tpt_b[IWL_RATE_COUNT] = { |
14577f23 | 86 | 7, 13, 35, 58, 0, 0, 0, 0, 0, 0, 0, 0 |
b481de9c ZY |
87 | }; |
88 | ||
bb8c093b | 89 | struct iwl3945_tpt_entry { |
b481de9c ZY |
90 | s8 min_rssi; |
91 | u8 index; | |
92 | }; | |
93 | ||
bb8c093b | 94 | static struct iwl3945_tpt_entry iwl3945_tpt_table_a[] = { |
b481de9c ZY |
95 | {-60, IWL_RATE_54M_INDEX}, |
96 | {-64, IWL_RATE_48M_INDEX}, | |
97 | {-72, IWL_RATE_36M_INDEX}, | |
98 | {-80, IWL_RATE_24M_INDEX}, | |
99 | {-84, IWL_RATE_18M_INDEX}, | |
100 | {-85, IWL_RATE_12M_INDEX}, | |
101 | {-87, IWL_RATE_9M_INDEX}, | |
102 | {-89, IWL_RATE_6M_INDEX} | |
103 | }; | |
104 | ||
bb8c093b | 105 | static struct iwl3945_tpt_entry iwl3945_tpt_table_g[] = { |
b481de9c ZY |
106 | {-60, IWL_RATE_54M_INDEX}, |
107 | {-64, IWL_RATE_48M_INDEX}, | |
108 | {-68, IWL_RATE_36M_INDEX}, | |
109 | {-80, IWL_RATE_24M_INDEX}, | |
110 | {-84, IWL_RATE_18M_INDEX}, | |
111 | {-85, IWL_RATE_12M_INDEX}, | |
112 | {-86, IWL_RATE_11M_INDEX}, | |
113 | {-88, IWL_RATE_5M_INDEX}, | |
114 | {-90, IWL_RATE_2M_INDEX}, | |
115 | {-92, IWL_RATE_1M_INDEX} | |
116 | }; | |
117 | ||
118 | #define IWL_RATE_MAX_WINDOW 62 | |
119 | #define IWL_RATE_FLUSH (3*HZ/10) | |
120 | #define IWL_RATE_WIN_FLUSH (HZ/2) | |
121 | #define IWL_RATE_HIGH_TH 11520 | |
122 | #define IWL_RATE_MIN_FAILURE_TH 8 | |
123 | #define IWL_RATE_MIN_SUCCESS_TH 8 | |
124 | #define IWL_RATE_DECREASE_TH 1920 | |
125 | ||
8318d78a | 126 | static u8 iwl3945_get_rate_index_by_rssi(s32 rssi, enum ieee80211_band band) |
b481de9c ZY |
127 | { |
128 | u32 index = 0; | |
129 | u32 table_size = 0; | |
bb8c093b | 130 | struct iwl3945_tpt_entry *tpt_table = NULL; |
b481de9c ZY |
131 | |
132 | if ((rssi < IWL_MIN_RSSI_VAL) || (rssi > IWL_MAX_RSSI_VAL)) | |
133 | rssi = IWL_MIN_RSSI_VAL; | |
134 | ||
8318d78a JB |
135 | switch (band) { |
136 | case IEEE80211_BAND_2GHZ: | |
bb8c093b CH |
137 | tpt_table = iwl3945_tpt_table_g; |
138 | table_size = ARRAY_SIZE(iwl3945_tpt_table_g); | |
b481de9c ZY |
139 | break; |
140 | ||
8318d78a | 141 | case IEEE80211_BAND_5GHZ: |
bb8c093b CH |
142 | tpt_table = iwl3945_tpt_table_a; |
143 | table_size = ARRAY_SIZE(iwl3945_tpt_table_a); | |
b481de9c ZY |
144 | break; |
145 | ||
146 | default: | |
8318d78a | 147 | BUG(); |
b481de9c ZY |
148 | break; |
149 | } | |
150 | ||
151 | while ((index < table_size) && (rssi < tpt_table[index].min_rssi)) | |
152 | index++; | |
153 | ||
154 | index = min(index, (table_size - 1)); | |
155 | ||
156 | return tpt_table[index].index; | |
157 | } | |
158 | ||
bb8c093b | 159 | static void iwl3945_clear_window(struct iwl3945_rate_scale_data *window) |
b481de9c ZY |
160 | { |
161 | window->data = 0; | |
162 | window->success_counter = 0; | |
28447f3c | 163 | window->success_ratio = -1; |
b481de9c | 164 | window->counter = 0; |
28447f3c | 165 | window->average_tpt = IWL_INV_TPT; |
b481de9c ZY |
166 | window->stamp = 0; |
167 | } | |
168 | ||
169 | /** | |
bb8c093b | 170 | * iwl3945_rate_scale_flush_windows - flush out the rate scale windows |
b481de9c ZY |
171 | * |
172 | * Returns the number of windows that have gathered data but were | |
173 | * not flushed. If there were any that were not flushed, then | |
174 | * reschedule the rate flushing routine. | |
175 | */ | |
fa254a68 | 176 | static int iwl3945_rate_scale_flush_windows(struct iwl3945_rs_sta *rs_sta) |
b481de9c ZY |
177 | { |
178 | int unflushed = 0; | |
179 | int i; | |
180 | unsigned long flags; | |
181 | ||
182 | /* | |
183 | * For each rate, if we have collected data on that rate | |
184 | * and it has been more than IWL_RATE_WIN_FLUSH | |
185 | * since we flushed, clear out the gathered statistics | |
186 | */ | |
187 | for (i = 0; i < IWL_RATE_COUNT; i++) { | |
fa254a68 | 188 | if (!rs_sta->win[i].counter) |
b481de9c ZY |
189 | continue; |
190 | ||
fa254a68 TW |
191 | spin_lock_irqsave(&rs_sta->lock, flags); |
192 | if (time_after(jiffies, rs_sta->win[i].stamp + | |
b481de9c ZY |
193 | IWL_RATE_WIN_FLUSH)) { |
194 | IWL_DEBUG_RATE("flushing %d samples of rate " | |
195 | "index %d\n", | |
fa254a68 TW |
196 | rs_sta->win[i].counter, i); |
197 | iwl3945_clear_window(&rs_sta->win[i]); | |
b481de9c ZY |
198 | } else |
199 | unflushed++; | |
fa254a68 | 200 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c ZY |
201 | } |
202 | ||
203 | return unflushed; | |
204 | } | |
205 | ||
206 | #define IWL_RATE_FLUSH_MAX 5000 /* msec */ | |
207 | #define IWL_RATE_FLUSH_MIN 50 /* msec */ | |
208 | ||
bb8c093b | 209 | static void iwl3945_bg_rate_scale_flush(unsigned long data) |
b481de9c | 210 | { |
fa254a68 | 211 | struct iwl3945_rs_sta *rs_sta = (void *)data; |
b481de9c ZY |
212 | int unflushed = 0; |
213 | unsigned long flags; | |
214 | u32 packet_count, duration, pps; | |
215 | ||
216 | IWL_DEBUG_RATE("enter\n"); | |
217 | ||
fa254a68 | 218 | unflushed = iwl3945_rate_scale_flush_windows(rs_sta); |
b481de9c | 219 | |
fa254a68 | 220 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 221 | |
fa254a68 | 222 | rs_sta->flush_pending = 0; |
b481de9c ZY |
223 | |
224 | /* Number of packets Rx'd since last time this timer ran */ | |
fa254a68 | 225 | packet_count = (rs_sta->tx_packets - rs_sta->last_tx_packets) + 1; |
b481de9c | 226 | |
fa254a68 | 227 | rs_sta->last_tx_packets = rs_sta->tx_packets + 1; |
b481de9c ZY |
228 | |
229 | if (unflushed) { | |
230 | duration = | |
fa254a68 TW |
231 | jiffies_to_msecs(jiffies - rs_sta->last_partial_flush); |
232 | /* duration = jiffies_to_msecs(rs_sta->flush_time); */ | |
b481de9c ZY |
233 | |
234 | IWL_DEBUG_RATE("Tx'd %d packets in %dms\n", | |
235 | packet_count, duration); | |
236 | ||
237 | /* Determine packets per second */ | |
238 | if (duration) | |
239 | pps = (packet_count * 1000) / duration; | |
240 | else | |
241 | pps = 0; | |
242 | ||
243 | if (pps) { | |
244 | duration = IWL_RATE_FLUSH_MAX / pps; | |
245 | if (duration < IWL_RATE_FLUSH_MIN) | |
246 | duration = IWL_RATE_FLUSH_MIN; | |
247 | } else | |
248 | duration = IWL_RATE_FLUSH_MAX; | |
249 | ||
fa254a68 | 250 | rs_sta->flush_time = msecs_to_jiffies(duration); |
b481de9c ZY |
251 | |
252 | IWL_DEBUG_RATE("new flush period: %d msec ave %d\n", | |
253 | duration, packet_count); | |
254 | ||
fa254a68 TW |
255 | mod_timer(&rs_sta->rate_scale_flush, jiffies + |
256 | rs_sta->flush_time); | |
b481de9c | 257 | |
fa254a68 | 258 | rs_sta->last_partial_flush = jiffies; |
b481de9c ZY |
259 | } |
260 | ||
261 | /* If there weren't any unflushed entries, we don't schedule the timer | |
262 | * to run again */ | |
263 | ||
fa254a68 | 264 | rs_sta->last_flush = jiffies; |
b481de9c | 265 | |
fa254a68 | 266 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c ZY |
267 | |
268 | IWL_DEBUG_RATE("leave\n"); | |
269 | } | |
270 | ||
271 | /** | |
bb8c093b | 272 | * iwl3945_collect_tx_data - Update the success/failure sliding window |
b481de9c ZY |
273 | * |
274 | * We keep a sliding window of the last 64 packets transmitted | |
275 | * at this rate. window->data contains the bitmask of successful | |
276 | * packets. | |
277 | */ | |
fa254a68 | 278 | static void iwl3945_collect_tx_data(struct iwl3945_rs_sta *rs_sta, |
bb8c093b | 279 | struct iwl3945_rate_scale_data *window, |
b481de9c ZY |
280 | int success, int retries) |
281 | { | |
282 | unsigned long flags; | |
283 | ||
284 | if (!retries) { | |
285 | IWL_DEBUG_RATE("leave: retries == 0 -- should be at least 1\n"); | |
286 | return; | |
287 | } | |
288 | ||
289 | while (retries--) { | |
fa254a68 | 290 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c ZY |
291 | |
292 | /* If we have filled up the window then subtract one from the | |
293 | * success counter if the high-bit is counting toward | |
294 | * success */ | |
295 | if (window->counter == IWL_RATE_MAX_WINDOW) { | |
296 | if (window->data & (1ULL << (IWL_RATE_MAX_WINDOW - 1))) | |
297 | window->success_counter--; | |
298 | } else | |
299 | window->counter++; | |
300 | ||
301 | /* Slide the window to the left one bit */ | |
302 | window->data = (window->data << 1); | |
303 | ||
304 | /* If this packet was a success then set the low bit high */ | |
305 | if (success) { | |
306 | window->success_counter++; | |
307 | window->data |= 1; | |
308 | } | |
309 | ||
310 | /* window->counter can't be 0 -- it is either >0 or | |
311 | * IWL_RATE_MAX_WINDOW */ | |
312 | window->success_ratio = 12800 * window->success_counter / | |
313 | window->counter; | |
314 | ||
315 | /* Tag this window as having been updated */ | |
316 | window->stamp = jiffies; | |
317 | ||
fa254a68 | 318 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c ZY |
319 | } |
320 | } | |
321 | ||
322 | static void rs_rate_init(void *priv_rate, void *priv_sta, | |
323 | struct ieee80211_local *local, struct sta_info *sta) | |
324 | { | |
b7e35008 | 325 | struct iwl3945_rs_sta *rs_sta = (void *)sta->rate_ctrl_priv; |
b481de9c ZY |
326 | int i; |
327 | ||
328 | IWL_DEBUG_RATE("enter\n"); | |
329 | ||
330 | /* TODO: what is a good starting rate for STA? About middle? Maybe not | |
331 | * the lowest or the highest rate.. Could consider using RSSI from | |
332 | * previous packets? Need to have IEEE 802.1X auth succeed immediately | |
333 | * after assoc.. */ | |
334 | ||
335 | for (i = IWL_RATE_COUNT - 1; i >= 0; i--) { | |
323ce79a | 336 | if (sta->sta.supp_rates[local->hw.conf.channel->band] & (1 << i)) { |
8318d78a | 337 | sta->txrate_idx = i; |
b481de9c ZY |
338 | break; |
339 | } | |
340 | } | |
341 | ||
b7e35008 | 342 | rs_sta->last_txrate_idx = sta->txrate_idx; |
b481de9c | 343 | |
8318d78a JB |
344 | /* For 5 GHz band it start at IWL_FIRST_OFDM_RATE */ |
345 | if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ) | |
b7e35008 | 346 | rs_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE; |
14577f23 | 347 | |
b481de9c ZY |
348 | IWL_DEBUG_RATE("leave\n"); |
349 | } | |
350 | ||
351 | static void *rs_alloc(struct ieee80211_local *local) | |
352 | { | |
353 | return local->hw.priv; | |
354 | } | |
355 | ||
01ebd063 | 356 | /* rate scale requires free function to be implemented */ |
b481de9c ZY |
357 | static void rs_free(void *priv) |
358 | { | |
359 | return; | |
360 | } | |
361 | static void rs_clear(void *priv) | |
362 | { | |
363 | return; | |
364 | } | |
365 | ||
366 | ||
367 | static void *rs_alloc_sta(void *priv, gfp_t gfp) | |
368 | { | |
fa254a68 | 369 | struct iwl3945_rs_sta *rs_sta; |
b481de9c ZY |
370 | int i; |
371 | ||
372 | IWL_DEBUG_RATE("enter\n"); | |
373 | ||
fa254a68 TW |
374 | rs_sta = kzalloc(sizeof(struct iwl3945_rs_sta), gfp); |
375 | if (!rs_sta) { | |
b481de9c ZY |
376 | IWL_DEBUG_RATE("leave: ENOMEM\n"); |
377 | return NULL; | |
378 | } | |
379 | ||
fa254a68 | 380 | spin_lock_init(&rs_sta->lock); |
b481de9c | 381 | |
fa254a68 | 382 | rs_sta->start_rate = IWL_RATE_INVALID; |
b481de9c ZY |
383 | |
384 | /* default to just 802.11b */ | |
fa254a68 | 385 | rs_sta->expected_tpt = iwl3945_expected_tpt_b; |
b481de9c | 386 | |
fa254a68 TW |
387 | rs_sta->last_partial_flush = jiffies; |
388 | rs_sta->last_flush = jiffies; | |
389 | rs_sta->flush_time = IWL_RATE_FLUSH; | |
390 | rs_sta->last_tx_packets = 0; | |
391 | rs_sta->ibss_sta_added = 0; | |
b481de9c | 392 | |
fa254a68 TW |
393 | init_timer(&rs_sta->rate_scale_flush); |
394 | rs_sta->rate_scale_flush.data = (unsigned long)rs_sta; | |
395 | rs_sta->rate_scale_flush.function = &iwl3945_bg_rate_scale_flush; | |
b481de9c ZY |
396 | |
397 | for (i = 0; i < IWL_RATE_COUNT; i++) | |
fa254a68 | 398 | iwl3945_clear_window(&rs_sta->win[i]); |
b481de9c ZY |
399 | |
400 | IWL_DEBUG_RATE("leave\n"); | |
401 | ||
fa254a68 | 402 | return rs_sta; |
b481de9c ZY |
403 | } |
404 | ||
405 | static void rs_free_sta(void *priv, void *priv_sta) | |
406 | { | |
fa254a68 | 407 | struct iwl3945_rs_sta *rs_sta = priv_sta; |
b481de9c ZY |
408 | |
409 | IWL_DEBUG_RATE("enter\n"); | |
fa254a68 TW |
410 | del_timer_sync(&rs_sta->rate_scale_flush); |
411 | kfree(rs_sta); | |
b481de9c ZY |
412 | IWL_DEBUG_RATE("leave\n"); |
413 | } | |
414 | ||
14577f23 MA |
415 | |
416 | /* | |
417 | * get ieee prev rate from rate scale table. | |
418 | * for A and B mode we need to overright prev | |
419 | * value | |
420 | */ | |
bb8c093b | 421 | static int rs_adjust_next_rate(struct iwl3945_priv *priv, int rate) |
14577f23 | 422 | { |
bb8c093b | 423 | int next_rate = iwl3945_get_prev_ieee_rate(rate); |
14577f23 | 424 | |
8318d78a JB |
425 | switch (priv->band) { |
426 | case IEEE80211_BAND_5GHZ: | |
14577f23 MA |
427 | if (rate == IWL_RATE_12M_INDEX) |
428 | next_rate = IWL_RATE_9M_INDEX; | |
429 | else if (rate == IWL_RATE_6M_INDEX) | |
430 | next_rate = IWL_RATE_6M_INDEX; | |
431 | break; | |
8318d78a | 432 | /* XXX cannot be invoked in current mac80211 so not a regression |
14577f23 MA |
433 | case MODE_IEEE80211B: |
434 | if (rate == IWL_RATE_11M_INDEX_TABLE) | |
435 | next_rate = IWL_RATE_5M_INDEX_TABLE; | |
436 | break; | |
8318d78a | 437 | */ |
14577f23 MA |
438 | default: |
439 | break; | |
440 | } | |
441 | ||
442 | return next_rate; | |
443 | } | |
b481de9c ZY |
444 | /** |
445 | * rs_tx_status - Update rate control values based on Tx results | |
446 | * | |
bb8c093b | 447 | * NOTE: Uses iwl3945_priv->retry_rate for the # of retries attempted by |
b481de9c ZY |
448 | * the hardware for each rate. |
449 | */ | |
450 | static void rs_tx_status(void *priv_rate, | |
451 | struct net_device *dev, | |
e039fa4a | 452 | struct sk_buff *skb) |
b481de9c ZY |
453 | { |
454 | u8 retries, current_count; | |
455 | int scale_rate_index, first_index, last_index; | |
456 | unsigned long flags; | |
457 | struct sta_info *sta; | |
458 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
bb8c093b | 459 | struct iwl3945_priv *priv = (struct iwl3945_priv *)priv_rate; |
b481de9c | 460 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); |
fa254a68 | 461 | struct iwl3945_rs_sta *rs_sta; |
8318d78a | 462 | struct ieee80211_supported_band *sband; |
e039fa4a | 463 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
8318d78a | 464 | |
28447f3c TW |
465 | IWL_DEBUG_RATE("enter\n"); |
466 | ||
8318d78a | 467 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; |
b481de9c | 468 | |
b481de9c | 469 | |
e039fa4a JB |
470 | retries = info->status.retry_count; |
471 | first_index = sband->bitrates[info->tx_rate_idx].hw_value; | |
b481de9c | 472 | if ((first_index < 0) || (first_index >= IWL_RATE_COUNT)) { |
8318d78a | 473 | IWL_DEBUG_RATE("leave: Rate out of bounds: %d\n", first_index); |
b481de9c ZY |
474 | return; |
475 | } | |
476 | ||
d0709a65 JB |
477 | rcu_read_lock(); |
478 | ||
b481de9c ZY |
479 | sta = sta_info_get(local, hdr->addr1); |
480 | if (!sta || !sta->rate_ctrl_priv) { | |
d0709a65 | 481 | rcu_read_unlock(); |
b481de9c ZY |
482 | IWL_DEBUG_RATE("leave: No STA priv data to update!\n"); |
483 | return; | |
484 | } | |
485 | ||
fa254a68 | 486 | rs_sta = (void *)sta->rate_ctrl_priv; |
b481de9c | 487 | |
fa254a68 | 488 | rs_sta->tx_packets++; |
b481de9c ZY |
489 | |
490 | scale_rate_index = first_index; | |
491 | last_index = first_index; | |
492 | ||
493 | /* | |
494 | * Update the window for each rate. We determine which rates | |
495 | * were Tx'd based on the total number of retries vs. the number | |
496 | * of retries configured for each rate -- currently set to the | |
497 | * priv value 'retry_rate' vs. rate specific | |
498 | * | |
499 | * On exit from this while loop last_index indicates the rate | |
500 | * at which the frame was finally transmitted (or failed if no | |
501 | * ACK) | |
502 | */ | |
503 | while (retries > 0) { | |
504 | if (retries < priv->retry_rate) { | |
505 | current_count = retries; | |
506 | last_index = scale_rate_index; | |
507 | } else { | |
508 | current_count = priv->retry_rate; | |
14577f23 MA |
509 | last_index = rs_adjust_next_rate(priv, |
510 | scale_rate_index); | |
b481de9c ZY |
511 | } |
512 | ||
513 | /* Update this rate accounting for as many retries | |
514 | * as was used for it (per current_count) */ | |
fa254a68 TW |
515 | iwl3945_collect_tx_data(rs_sta, |
516 | &rs_sta->win[scale_rate_index], | |
b481de9c ZY |
517 | 0, current_count); |
518 | IWL_DEBUG_RATE("Update rate %d for %d retries.\n", | |
519 | scale_rate_index, current_count); | |
520 | ||
521 | retries -= current_count; | |
522 | ||
523 | if (retries) | |
524 | scale_rate_index = | |
14577f23 | 525 | rs_adjust_next_rate(priv, scale_rate_index); |
b481de9c ZY |
526 | } |
527 | ||
14577f23 | 528 | |
b481de9c ZY |
529 | /* Update the last index window with success/failure based on ACK */ |
530 | IWL_DEBUG_RATE("Update rate %d with %s.\n", | |
531 | last_index, | |
e039fa4a | 532 | (info->flags & IEEE80211_TX_STAT_ACK) ? |
b481de9c | 533 | "success" : "failure"); |
fa254a68 TW |
534 | iwl3945_collect_tx_data(rs_sta, |
535 | &rs_sta->win[last_index], | |
e039fa4a | 536 | info->flags & IEEE80211_TX_STAT_ACK, 1); |
b481de9c ZY |
537 | |
538 | /* We updated the rate scale window -- if its been more than | |
539 | * flush_time since the last run, schedule the flush | |
540 | * again */ | |
fa254a68 | 541 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 542 | |
fa254a68 TW |
543 | if (!rs_sta->flush_pending && |
544 | time_after(jiffies, rs_sta->last_partial_flush + | |
545 | rs_sta->flush_time)) { | |
b481de9c | 546 | |
fa254a68 TW |
547 | rs_sta->flush_pending = 1; |
548 | mod_timer(&rs_sta->rate_scale_flush, | |
549 | jiffies + rs_sta->flush_time); | |
b481de9c ZY |
550 | } |
551 | ||
fa254a68 | 552 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c | 553 | |
d0709a65 | 554 | rcu_read_unlock(); |
b481de9c ZY |
555 | |
556 | IWL_DEBUG_RATE("leave\n"); | |
557 | ||
558 | return; | |
559 | } | |
560 | ||
fa254a68 | 561 | static u16 iwl3945_get_adjacent_rate(struct iwl3945_rs_sta *rs_sta, |
8318d78a | 562 | u8 index, u16 rate_mask, enum ieee80211_band band) |
b481de9c ZY |
563 | { |
564 | u8 high = IWL_RATE_INVALID; | |
565 | u8 low = IWL_RATE_INVALID; | |
566 | ||
01ebd063 | 567 | /* 802.11A walks to the next literal adjacent rate in |
b481de9c | 568 | * the rate table */ |
8318d78a | 569 | if (unlikely(band == IEEE80211_BAND_5GHZ)) { |
b481de9c ZY |
570 | int i; |
571 | u32 mask; | |
572 | ||
573 | /* Find the previous rate that is in the rate mask */ | |
574 | i = index - 1; | |
575 | for (mask = (1 << i); i >= 0; i--, mask >>= 1) { | |
576 | if (rate_mask & mask) { | |
577 | low = i; | |
578 | break; | |
579 | } | |
580 | } | |
581 | ||
582 | /* Find the next rate that is in the rate mask */ | |
583 | i = index + 1; | |
584 | for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { | |
585 | if (rate_mask & mask) { | |
586 | high = i; | |
587 | break; | |
588 | } | |
589 | } | |
590 | ||
591 | return (high << 8) | low; | |
592 | } | |
593 | ||
594 | low = index; | |
595 | while (low != IWL_RATE_INVALID) { | |
fa254a68 | 596 | if (rs_sta->tgg) |
bb8c093b | 597 | low = iwl3945_rates[low].prev_rs_tgg; |
b481de9c | 598 | else |
bb8c093b | 599 | low = iwl3945_rates[low].prev_rs; |
b481de9c ZY |
600 | if (low == IWL_RATE_INVALID) |
601 | break; | |
602 | if (rate_mask & (1 << low)) | |
603 | break; | |
604 | IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low); | |
605 | } | |
606 | ||
607 | high = index; | |
608 | while (high != IWL_RATE_INVALID) { | |
fa254a68 | 609 | if (rs_sta->tgg) |
bb8c093b | 610 | high = iwl3945_rates[high].next_rs_tgg; |
b481de9c | 611 | else |
bb8c093b | 612 | high = iwl3945_rates[high].next_rs; |
b481de9c ZY |
613 | if (high == IWL_RATE_INVALID) |
614 | break; | |
615 | if (rate_mask & (1 << high)) | |
616 | break; | |
617 | IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high); | |
618 | } | |
619 | ||
620 | return (high << 8) | low; | |
621 | } | |
622 | ||
623 | /** | |
624 | * rs_get_rate - find the rate for the requested packet | |
625 | * | |
626 | * Returns the ieee80211_rate structure allocated by the driver. | |
627 | * | |
628 | * The rate control algorithm has no internal mapping between hw_mode's | |
629 | * rate ordering and the rate ordering used by the rate control algorithm. | |
630 | * | |
631 | * The rate control algorithm uses a single table of rates that goes across | |
632 | * the entire A/B/G spectrum vs. being limited to just one particular | |
633 | * hw_mode. | |
634 | * | |
635 | * As such, we can't convert the index obtained below into the hw_mode's | |
636 | * rate table and must reference the driver allocated rate table | |
637 | * | |
638 | */ | |
1abbe498 | 639 | static void rs_get_rate(void *priv_rate, struct net_device *dev, |
28447f3c | 640 | struct ieee80211_supported_band *sband, |
8318d78a | 641 | struct sk_buff *skb, |
1abbe498 | 642 | struct rate_selection *sel) |
b481de9c ZY |
643 | { |
644 | u8 low = IWL_RATE_INVALID; | |
645 | u8 high = IWL_RATE_INVALID; | |
646 | u16 high_low; | |
647 | int index; | |
fa254a68 | 648 | struct iwl3945_rs_sta *rs_sta; |
bb8c093b | 649 | struct iwl3945_rate_scale_data *window = NULL; |
28447f3c TW |
650 | int current_tpt = IWL_INV_TPT; |
651 | int low_tpt = IWL_INV_TPT; | |
652 | int high_tpt = IWL_INV_TPT; | |
b481de9c ZY |
653 | u32 fail_count; |
654 | s8 scale_action = 0; | |
655 | unsigned long flags; | |
656 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
657 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
658 | struct sta_info *sta; | |
2bc454b0 | 659 | u16 fc, rate_mask; |
bb8c093b | 660 | struct iwl3945_priv *priv = (struct iwl3945_priv *)priv_rate; |
0795af57 | 661 | DECLARE_MAC_BUF(mac); |
b481de9c ZY |
662 | |
663 | IWL_DEBUG_RATE("enter\n"); | |
664 | ||
d0709a65 JB |
665 | rcu_read_lock(); |
666 | ||
b481de9c | 667 | sta = sta_info_get(local, hdr->addr1); |
2bc454b0 MW |
668 | |
669 | /* Send management frames and broadcast/multicast data using lowest | |
670 | * rate. */ | |
671 | fc = le16_to_cpu(hdr->frame_control); | |
672 | if ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA || | |
673 | is_multicast_ether_addr(hdr->addr1) || | |
674 | !sta || !sta->rate_ctrl_priv) { | |
b481de9c | 675 | IWL_DEBUG_RATE("leave: No STA priv data to update!\n"); |
2e92e6f2 | 676 | sel->rate_idx = rate_lowest_index(local, sband, sta); |
d0709a65 | 677 | rcu_read_unlock(); |
1abbe498 | 678 | return; |
b481de9c ZY |
679 | } |
680 | ||
b7e35008 JB |
681 | rs_sta = (void *)sta->rate_ctrl_priv; |
682 | ||
323ce79a | 683 | rate_mask = sta->sta.supp_rates[sband->band]; |
b7e35008 | 684 | index = min(rs_sta->last_txrate_idx & 0xffff, IWL_RATE_COUNT - 1); |
14577f23 | 685 | |
28447f3c | 686 | if (sband->band == IEEE80211_BAND_5GHZ) |
14577f23 | 687 | rate_mask = rate_mask << IWL_FIRST_OFDM_RATE; |
b481de9c | 688 | |
05c914fe | 689 | if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) && |
fa254a68 | 690 | !rs_sta->ibss_sta_added) { |
bb8c093b | 691 | u8 sta_id = iwl3945_hw_find_station(priv, hdr->addr1); |
b481de9c ZY |
692 | |
693 | if (sta_id == IWL_INVALID_STATION) { | |
0795af57 JP |
694 | IWL_DEBUG_RATE("LQ: ADD station %s\n", |
695 | print_mac(mac, hdr->addr1)); | |
bb8c093b | 696 | sta_id = iwl3945_add_station(priv, |
b481de9c ZY |
697 | hdr->addr1, 0, CMD_ASYNC); |
698 | } | |
699 | if (sta_id != IWL_INVALID_STATION) | |
fa254a68 | 700 | rs_sta->ibss_sta_added = 1; |
b481de9c ZY |
701 | } |
702 | ||
fa254a68 | 703 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 704 | |
fa254a68 TW |
705 | if (rs_sta->start_rate != IWL_RATE_INVALID) { |
706 | index = rs_sta->start_rate; | |
707 | rs_sta->start_rate = IWL_RATE_INVALID; | |
b481de9c ZY |
708 | } |
709 | ||
fa254a68 | 710 | window = &(rs_sta->win[index]); |
b481de9c ZY |
711 | |
712 | fail_count = window->counter - window->success_counter; | |
713 | ||
714 | if (((fail_count <= IWL_RATE_MIN_FAILURE_TH) && | |
715 | (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))) { | |
28447f3c | 716 | window->average_tpt = IWL_INV_TPT; |
fa254a68 | 717 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c ZY |
718 | |
719 | IWL_DEBUG_RATE("Invalid average_tpt on rate %d: " | |
720 | "counter: %d, success_counter: %d, " | |
721 | "expected_tpt is %sNULL\n", | |
722 | index, | |
723 | window->counter, | |
724 | window->success_counter, | |
fa254a68 | 725 | rs_sta->expected_tpt ? "not " : ""); |
b481de9c ZY |
726 | goto out; |
727 | ||
728 | } | |
729 | ||
730 | window->average_tpt = ((window->success_ratio * | |
fa254a68 | 731 | rs_sta->expected_tpt[index] + 64) / 128); |
b481de9c ZY |
732 | current_tpt = window->average_tpt; |
733 | ||
fa254a68 | 734 | high_low = iwl3945_get_adjacent_rate(rs_sta, index, rate_mask, |
28447f3c | 735 | sband->band); |
b481de9c ZY |
736 | low = high_low & 0xff; |
737 | high = (high_low >> 8) & 0xff; | |
738 | ||
739 | if (low != IWL_RATE_INVALID) | |
fa254a68 | 740 | low_tpt = rs_sta->win[low].average_tpt; |
b481de9c ZY |
741 | |
742 | if (high != IWL_RATE_INVALID) | |
fa254a68 | 743 | high_tpt = rs_sta->win[high].average_tpt; |
b481de9c | 744 | |
fa254a68 | 745 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c ZY |
746 | |
747 | scale_action = 1; | |
748 | ||
749 | if ((window->success_ratio < IWL_RATE_DECREASE_TH) || !current_tpt) { | |
750 | IWL_DEBUG_RATE("decrease rate because of low success_ratio\n"); | |
751 | scale_action = -1; | |
28447f3c | 752 | } else if ((low_tpt == IWL_INV_TPT) && (high_tpt == IWL_INV_TPT)) |
b481de9c | 753 | scale_action = 1; |
28447f3c TW |
754 | else if ((low_tpt != IWL_INV_TPT) && (high_tpt != IWL_INV_TPT) && |
755 | (low_tpt < current_tpt) && (high_tpt < current_tpt)) { | |
b481de9c ZY |
756 | IWL_DEBUG_RATE("No action -- low [%d] & high [%d] < " |
757 | "current_tpt [%d]\n", | |
758 | low_tpt, high_tpt, current_tpt); | |
759 | scale_action = 0; | |
760 | } else { | |
28447f3c | 761 | if (high_tpt != IWL_INV_TPT) { |
b481de9c ZY |
762 | if (high_tpt > current_tpt) |
763 | scale_action = 1; | |
764 | else { | |
765 | IWL_DEBUG_RATE | |
766 | ("decrease rate because of high tpt\n"); | |
767 | scale_action = -1; | |
768 | } | |
28447f3c | 769 | } else if (low_tpt != IWL_INV_TPT) { |
b481de9c ZY |
770 | if (low_tpt > current_tpt) { |
771 | IWL_DEBUG_RATE | |
772 | ("decrease rate because of low tpt\n"); | |
773 | scale_action = -1; | |
774 | } else | |
775 | scale_action = 1; | |
776 | } | |
777 | } | |
778 | ||
779 | if ((window->success_ratio > IWL_RATE_HIGH_TH) || | |
780 | (current_tpt > window->average_tpt)) { | |
781 | IWL_DEBUG_RATE("No action -- success_ratio [%d] > HIGH_TH or " | |
782 | "current_tpt [%d] > average_tpt [%d]\n", | |
783 | window->success_ratio, | |
784 | current_tpt, window->average_tpt); | |
785 | scale_action = 0; | |
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) |
b7e35008 | 812 | sta->txrate_idx = rs_sta->last_txrate_idx - IWL_FIRST_OFDM_RATE; |
14577f23 | 813 | else |
b7e35008 | 814 | sta->txrate_idx = rs_sta->last_txrate_idx; |
14577f23 | 815 | |
d0709a65 | 816 | rcu_read_unlock(); |
b481de9c ZY |
817 | |
818 | IWL_DEBUG_RATE("leave: %d\n", index); | |
819 | ||
2e92e6f2 | 820 | sel->rate_idx = sta->txrate_idx; |
b481de9c ZY |
821 | } |
822 | ||
823 | static struct rate_control_ops rs_ops = { | |
824 | .module = NULL, | |
825 | .name = RS_NAME, | |
826 | .tx_status = rs_tx_status, | |
827 | .get_rate = rs_get_rate, | |
828 | .rate_init = rs_rate_init, | |
829 | .clear = rs_clear, | |
830 | .alloc = rs_alloc, | |
831 | .free = rs_free, | |
832 | .alloc_sta = rs_alloc_sta, | |
833 | .free_sta = rs_free_sta, | |
834 | }; | |
835 | ||
bb8c093b | 836 | int iwl3945_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id) |
b481de9c ZY |
837 | { |
838 | struct ieee80211_local *local = hw_to_local(hw); | |
bb8c093b | 839 | struct iwl3945_priv *priv = hw->priv; |
fa254a68 | 840 | struct iwl3945_rs_sta *rs_sta; |
b481de9c ZY |
841 | struct sta_info *sta; |
842 | unsigned long flags; | |
843 | int count = 0, i; | |
844 | u32 samples = 0, success = 0, good = 0; | |
845 | unsigned long now = jiffies; | |
846 | u32 max_time = 0; | |
847 | ||
d0709a65 JB |
848 | rcu_read_lock(); |
849 | ||
b481de9c ZY |
850 | sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr); |
851 | if (!sta || !sta->rate_ctrl_priv) { | |
d0709a65 | 852 | if (sta) |
b481de9c | 853 | IWL_DEBUG_RATE("leave - no private rate data!\n"); |
d0709a65 | 854 | else |
b481de9c | 855 | IWL_DEBUG_RATE("leave - no station!\n"); |
d0709a65 | 856 | rcu_read_unlock(); |
b481de9c ZY |
857 | return sprintf(buf, "station %d not found\n", sta_id); |
858 | } | |
859 | ||
fa254a68 TW |
860 | rs_sta = (void *)sta->rate_ctrl_priv; |
861 | spin_lock_irqsave(&rs_sta->lock, flags); | |
b481de9c ZY |
862 | i = IWL_RATE_54M_INDEX; |
863 | while (1) { | |
864 | u64 mask; | |
865 | int j; | |
866 | ||
867 | count += | |
bb8c093b | 868 | sprintf(&buf[count], " %2dMbs: ", iwl3945_rates[i].ieee / 2); |
b481de9c ZY |
869 | |
870 | mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1)); | |
871 | for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1) | |
872 | buf[count++] = | |
fa254a68 | 873 | (rs_sta->win[i].data & mask) ? '1' : '0'; |
b481de9c | 874 | |
fa254a68 TW |
875 | samples += rs_sta->win[i].counter; |
876 | good += rs_sta->win[i].success_counter; | |
877 | success += rs_sta->win[i].success_counter * | |
878 | iwl3945_rates[i].ieee; | |
b481de9c | 879 | |
fa254a68 | 880 | if (rs_sta->win[i].stamp) { |
b481de9c | 881 | int delta = |
fa254a68 | 882 | jiffies_to_msecs(now - rs_sta->win[i].stamp); |
b481de9c ZY |
883 | |
884 | if (delta > max_time) | |
885 | max_time = delta; | |
886 | ||
887 | count += sprintf(&buf[count], "%5dms\n", delta); | |
888 | } else | |
889 | buf[count++] = '\n'; | |
890 | ||
bb8c093b | 891 | j = iwl3945_get_prev_ieee_rate(i); |
b481de9c ZY |
892 | if (j == i) |
893 | break; | |
894 | i = j; | |
895 | } | |
fa254a68 | 896 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
d0709a65 | 897 | rcu_read_unlock(); |
b481de9c ZY |
898 | |
899 | /* Display the average rate of all samples taken. | |
900 | * | |
901 | * NOTE: We multiple # of samples by 2 since the IEEE measurement | |
bb8c093b | 902 | * added from iwl3945_rates is actually 2X the rate */ |
b481de9c ZY |
903 | if (samples) |
904 | count += sprintf( | |
905 | &buf[count], | |
906 | "\nAverage rate is %3d.%02dMbs over last %4dms\n" | |
907 | "%3d%% success (%d good packets over %d tries)\n", | |
908 | success / (2 * samples), (success * 5 / samples) % 10, | |
909 | max_time, good * 100 / samples, good, samples); | |
910 | else | |
911 | count += sprintf(&buf[count], "\nAverage rate: 0Mbs\n"); | |
912 | ||
913 | return count; | |
914 | } | |
915 | ||
bb8c093b | 916 | void iwl3945_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id) |
b481de9c | 917 | { |
bb8c093b | 918 | struct iwl3945_priv *priv = hw->priv; |
b481de9c ZY |
919 | s32 rssi = 0; |
920 | unsigned long flags; | |
921 | struct ieee80211_local *local = hw_to_local(hw); | |
fa254a68 | 922 | struct iwl3945_rs_sta *rs_sta; |
b481de9c ZY |
923 | struct sta_info *sta; |
924 | ||
925 | IWL_DEBUG_RATE("enter\n"); | |
926 | ||
927 | if (!local->rate_ctrl->ops->name || | |
928 | strcmp(local->rate_ctrl->ops->name, RS_NAME)) { | |
929 | IWL_WARNING("iwl-3945-rs not selected as rate control algo!\n"); | |
930 | IWL_DEBUG_RATE("leave - mac80211 picked the wrong RC algo.\n"); | |
931 | return; | |
932 | } | |
933 | ||
d0709a65 JB |
934 | rcu_read_lock(); |
935 | ||
b481de9c ZY |
936 | sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr); |
937 | if (!sta || !sta->rate_ctrl_priv) { | |
b481de9c | 938 | IWL_DEBUG_RATE("leave - no private rate data!\n"); |
d0709a65 | 939 | rcu_read_unlock(); |
b481de9c ZY |
940 | return; |
941 | } | |
942 | ||
fa254a68 | 943 | rs_sta = (void *)sta->rate_ctrl_priv; |
b481de9c | 944 | |
fa254a68 | 945 | spin_lock_irqsave(&rs_sta->lock, flags); |
b481de9c | 946 | |
fa254a68 | 947 | rs_sta->tgg = 0; |
8318d78a JB |
948 | switch (priv->band) { |
949 | case IEEE80211_BAND_2GHZ: | |
950 | /* TODO: this always does G, not a regression */ | |
b481de9c | 951 | if (priv->active_rxon.flags & RXON_FLG_TGG_PROTECT_MSK) { |
fa254a68 TW |
952 | rs_sta->tgg = 1; |
953 | rs_sta->expected_tpt = iwl3945_expected_tpt_g_prot; | |
b481de9c | 954 | } else |
fa254a68 | 955 | rs_sta->expected_tpt = iwl3945_expected_tpt_g; |
b481de9c ZY |
956 | break; |
957 | ||
8318d78a | 958 | case IEEE80211_BAND_5GHZ: |
fa254a68 | 959 | rs_sta->expected_tpt = iwl3945_expected_tpt_a; |
b481de9c | 960 | break; |
8318d78a JB |
961 | case IEEE80211_NUM_BANDS: |
962 | BUG(); | |
b481de9c ZY |
963 | break; |
964 | } | |
965 | ||
d0709a65 | 966 | rcu_read_unlock(); |
fa254a68 | 967 | spin_unlock_irqrestore(&rs_sta->lock, flags); |
b481de9c ZY |
968 | |
969 | rssi = priv->last_rx_rssi; | |
970 | if (rssi == 0) | |
971 | rssi = IWL_MIN_RSSI_VAL; | |
972 | ||
973 | IWL_DEBUG(IWL_DL_INFO | IWL_DL_RATE, "Network RSSI: %d\n", rssi); | |
974 | ||
8318d78a | 975 | rs_sta->start_rate = iwl3945_get_rate_index_by_rssi(rssi, priv->band); |
b481de9c ZY |
976 | |
977 | IWL_DEBUG_RATE("leave: rssi %d assign rate index: " | |
fa254a68 TW |
978 | "%d (plcp 0x%x)\n", rssi, rs_sta->start_rate, |
979 | iwl3945_rates[rs_sta->start_rate].plcp); | |
b481de9c ZY |
980 | } |
981 | ||
897e1cf2 | 982 | int iwl3945_rate_control_register(void) |
b481de9c | 983 | { |
897e1cf2 | 984 | return ieee80211_rate_control_register(&rs_ops); |
b481de9c ZY |
985 | } |
986 | ||
897e1cf2 | 987 | void iwl3945_rate_control_unregister(void) |
b481de9c ZY |
988 | { |
989 | ieee80211_rate_control_unregister(&rs_ops); | |
990 | } | |
991 | ||
992 |