1 /******************************************************************************
3 * Copyright(c) 2005 - 2010 Intel Corporation. All rights reserved.
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.
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
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
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
21 * Contact Information:
22 * Intel Linux Wireless <ilw@linux.intel.com>
23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
25 *****************************************************************************/
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>
33 #include <linux/netdevice.h>
34 #include <linux/etherdevice.h>
35 #include <linux/delay.h>
37 #include <linux/workqueue.h>
39 #include "iwl-commands.h"
43 #define RS_NAME "iwl-3945-rs"
45 static s32 iwl3945_expected_tpt_g[IWL_RATE_COUNT_3945] = {
46 7, 13, 35, 58, 0, 0, 76, 104, 130, 168, 191, 202
49 static s32 iwl3945_expected_tpt_g_prot[IWL_RATE_COUNT_3945] = {
50 7, 13, 35, 58, 0, 0, 0, 80, 93, 113, 123, 125
53 static s32 iwl3945_expected_tpt_a[IWL_RATE_COUNT_3945] = {
54 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186
57 static s32 iwl3945_expected_tpt_b[IWL_RATE_COUNT_3945] = {
58 7, 13, 35, 58, 0, 0, 0, 0, 0, 0, 0, 0
61 struct iwl3945_tpt_entry {
66 static struct iwl3945_tpt_entry iwl3945_tpt_table_a[] = {
67 {-60, IWL_RATE_54M_INDEX},
68 {-64, IWL_RATE_48M_INDEX},
69 {-72, IWL_RATE_36M_INDEX},
70 {-80, IWL_RATE_24M_INDEX},
71 {-84, IWL_RATE_18M_INDEX},
72 {-85, IWL_RATE_12M_INDEX},
73 {-87, IWL_RATE_9M_INDEX},
74 {-89, IWL_RATE_6M_INDEX}
77 static struct iwl3945_tpt_entry iwl3945_tpt_table_g[] = {
78 {-60, IWL_RATE_54M_INDEX},
79 {-64, IWL_RATE_48M_INDEX},
80 {-68, IWL_RATE_36M_INDEX},
81 {-80, IWL_RATE_24M_INDEX},
82 {-84, IWL_RATE_18M_INDEX},
83 {-85, IWL_RATE_12M_INDEX},
84 {-86, IWL_RATE_11M_INDEX},
85 {-88, IWL_RATE_5M_INDEX},
86 {-90, IWL_RATE_2M_INDEX},
87 {-92, IWL_RATE_1M_INDEX}
90 #define IWL_RATE_MAX_WINDOW 62
91 #define IWL_RATE_FLUSH (3*HZ)
92 #define IWL_RATE_WIN_FLUSH (HZ/2)
93 #define IWL39_RATE_HIGH_TH 11520
94 #define IWL_SUCCESS_UP_TH 8960
95 #define IWL_SUCCESS_DOWN_TH 10880
96 #define IWL_RATE_MIN_FAILURE_TH 6
97 #define IWL_RATE_MIN_SUCCESS_TH 8
98 #define IWL_RATE_DECREASE_TH 1920
99 #define IWL_RATE_RETRY_TH 15
101 static u8 iwl3945_get_rate_index_by_rssi(s32 rssi, enum ieee80211_band band)
105 struct iwl3945_tpt_entry *tpt_table = NULL;
107 if ((rssi < IWL_MIN_RSSI_VAL) || (rssi > IWL_MAX_RSSI_VAL))
108 rssi = IWL_MIN_RSSI_VAL;
111 case IEEE80211_BAND_2GHZ:
112 tpt_table = iwl3945_tpt_table_g;
113 table_size = ARRAY_SIZE(iwl3945_tpt_table_g);
116 case IEEE80211_BAND_5GHZ:
117 tpt_table = iwl3945_tpt_table_a;
118 table_size = ARRAY_SIZE(iwl3945_tpt_table_a);
126 while ((index < table_size) && (rssi < tpt_table[index].min_rssi))
129 index = min(index, (table_size - 1));
131 return tpt_table[index].index;
134 static void iwl3945_clear_window(struct iwl3945_rate_scale_data *window)
137 window->success_counter = 0;
138 window->success_ratio = -1;
140 window->average_tpt = IWL_INVALID_VALUE;
145 * iwl3945_rate_scale_flush_windows - flush out the rate scale windows
147 * Returns the number of windows that have gathered data but were
148 * not flushed. If there were any that were not flushed, then
149 * reschedule the rate flushing routine.
151 static int iwl3945_rate_scale_flush_windows(struct iwl3945_rs_sta *rs_sta)
156 struct iwl_priv *priv __maybe_unused = rs_sta->priv;
159 * For each rate, if we have collected data on that rate
160 * and it has been more than IWL_RATE_WIN_FLUSH
161 * since we flushed, clear out the gathered statistics
163 for (i = 0; i < IWL_RATE_COUNT_3945; i++) {
164 if (!rs_sta->win[i].counter)
167 spin_lock_irqsave(&rs_sta->lock, flags);
168 if (time_after(jiffies, rs_sta->win[i].stamp +
169 IWL_RATE_WIN_FLUSH)) {
170 IWL_DEBUG_RATE(priv, "flushing %d samples of rate "
172 rs_sta->win[i].counter, i);
173 iwl3945_clear_window(&rs_sta->win[i]);
176 spin_unlock_irqrestore(&rs_sta->lock, flags);
182 #define IWL_RATE_FLUSH_MAX 5000 /* msec */
183 #define IWL_RATE_FLUSH_MIN 50 /* msec */
184 #define IWL_AVERAGE_PACKETS 1500
186 static void iwl3945_bg_rate_scale_flush(unsigned long data)
188 struct iwl3945_rs_sta *rs_sta = (void *)data;
189 struct iwl_priv *priv __maybe_unused = rs_sta->priv;
192 u32 packet_count, duration, pps;
194 IWL_DEBUG_RATE(priv, "enter\n");
196 unflushed = iwl3945_rate_scale_flush_windows(rs_sta);
198 spin_lock_irqsave(&rs_sta->lock, flags);
200 /* Number of packets Rx'd since last time this timer ran */
201 packet_count = (rs_sta->tx_packets - rs_sta->last_tx_packets) + 1;
203 rs_sta->last_tx_packets = rs_sta->tx_packets + 1;
207 jiffies_to_msecs(jiffies - rs_sta->last_partial_flush);
209 IWL_DEBUG_RATE(priv, "Tx'd %d packets in %dms\n",
210 packet_count, duration);
212 /* Determine packets per second */
214 pps = (packet_count * 1000) / duration;
219 duration = (IWL_AVERAGE_PACKETS * 1000) / pps;
220 if (duration < IWL_RATE_FLUSH_MIN)
221 duration = IWL_RATE_FLUSH_MIN;
222 else if (duration > IWL_RATE_FLUSH_MAX)
223 duration = IWL_RATE_FLUSH_MAX;
225 duration = IWL_RATE_FLUSH_MAX;
227 rs_sta->flush_time = msecs_to_jiffies(duration);
229 IWL_DEBUG_RATE(priv, "new flush period: %d msec ave %d\n",
230 duration, packet_count);
232 mod_timer(&rs_sta->rate_scale_flush, jiffies +
235 rs_sta->last_partial_flush = jiffies;
237 rs_sta->flush_time = IWL_RATE_FLUSH;
238 rs_sta->flush_pending = 0;
240 /* If there weren't any unflushed entries, we don't schedule the timer
243 rs_sta->last_flush = jiffies;
245 spin_unlock_irqrestore(&rs_sta->lock, flags);
247 IWL_DEBUG_RATE(priv, "leave\n");
251 * iwl3945_collect_tx_data - Update the success/failure sliding window
253 * We keep a sliding window of the last 64 packets transmitted
254 * at this rate. window->data contains the bitmask of successful
257 static void iwl3945_collect_tx_data(struct iwl3945_rs_sta *rs_sta,
258 struct iwl3945_rate_scale_data *window,
259 int success, int retries, int index)
263 struct iwl_priv *priv __maybe_unused = rs_sta->priv;
266 IWL_DEBUG_RATE(priv, "leave: retries == 0 -- should be at least 1\n");
270 spin_lock_irqsave(&rs_sta->lock, flags);
273 * Keep track of only the latest 62 tx frame attempts in this rate's
274 * history window; anything older isn't really relevant any more.
275 * If we have filled up the sliding window, drop the oldest attempt;
276 * if the oldest attempt (highest bit in bitmap) shows "success",
277 * subtract "1" from the success counter (this is the main reason
278 * we keep these bitmaps!).
280 while (retries > 0) {
281 if (window->counter >= IWL_RATE_MAX_WINDOW) {
283 /* remove earliest */
284 window->counter = IWL_RATE_MAX_WINDOW - 1;
286 if (window->data & (1ULL << (IWL_RATE_MAX_WINDOW - 1))) {
287 window->data &= ~(1ULL << (IWL_RATE_MAX_WINDOW - 1));
288 window->success_counter--;
292 /* Increment frames-attempted counter */
295 /* Shift bitmap by one frame (throw away oldest history),
296 * OR in "1", and increment "success" if this
297 * frame was successful. */
300 window->success_counter++;
308 /* Calculate current success ratio, avoid divide-by-0! */
309 if (window->counter > 0)
310 window->success_ratio = 128 * (100 * window->success_counter)
313 window->success_ratio = IWL_INVALID_VALUE;
315 fail_count = window->counter - window->success_counter;
317 /* Calculate average throughput, if we have enough history. */
318 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
319 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
320 window->average_tpt = ((window->success_ratio *
321 rs_sta->expected_tpt[index] + 64) / 128);
323 window->average_tpt = IWL_INVALID_VALUE;
325 /* Tag this window as having been updated */
326 window->stamp = jiffies;
328 spin_unlock_irqrestore(&rs_sta->lock, flags);
333 * Called after adding a new station to initialize rate scaling
335 void iwl3945_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
337 struct ieee80211_hw *hw = priv->hw;
338 struct ieee80211_conf *conf = &priv->hw->conf;
339 struct iwl3945_sta_priv *psta;
340 struct iwl3945_rs_sta *rs_sta;
341 struct ieee80211_supported_band *sband;
344 IWL_DEBUG_INFO(priv, "enter\n");
345 if (sta_id == priv->hw_params.bcast_sta_id)
348 psta = (struct iwl3945_sta_priv *) sta->drv_priv;
349 rs_sta = &psta->rs_sta;
350 sband = hw->wiphy->bands[conf->channel->band];
354 rs_sta->start_rate = IWL_RATE_INVALID;
356 /* default to just 802.11b */
357 rs_sta->expected_tpt = iwl3945_expected_tpt_b;
359 rs_sta->last_partial_flush = jiffies;
360 rs_sta->last_flush = jiffies;
361 rs_sta->flush_time = IWL_RATE_FLUSH;
362 rs_sta->last_tx_packets = 0;
364 rs_sta->rate_scale_flush.data = (unsigned long)rs_sta;
365 rs_sta->rate_scale_flush.function = iwl3945_bg_rate_scale_flush;
367 for (i = 0; i < IWL_RATE_COUNT_3945; i++)
368 iwl3945_clear_window(&rs_sta->win[i]);
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
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;
382 priv->_3945.sta_supp_rates = sta->supp_rates[sband->band];
383 /* For 5 GHz band it start at IWL_FIRST_OFDM_RATE */
384 if (sband->band == IEEE80211_BAND_5GHZ) {
385 rs_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
386 priv->_3945.sta_supp_rates = priv->_3945.sta_supp_rates <<
391 priv->stations[sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
393 IWL_DEBUG_INFO(priv, "leave\n");
396 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
401 /* rate scale requires free function to be implemented */
402 static void rs_free(void *priv)
407 static void *rs_alloc_sta(void *iwl_priv, struct ieee80211_sta *sta, gfp_t gfp)
409 struct iwl3945_rs_sta *rs_sta;
410 struct iwl3945_sta_priv *psta = (void *) sta->drv_priv;
411 struct iwl_priv *priv __maybe_unused = iwl_priv;
413 IWL_DEBUG_RATE(priv, "enter\n");
415 rs_sta = &psta->rs_sta;
417 spin_lock_init(&rs_sta->lock);
418 init_timer(&rs_sta->rate_scale_flush);
420 IWL_DEBUG_RATE(priv, "leave\n");
425 static void rs_free_sta(void *iwl_priv, struct ieee80211_sta *sta,
428 struct iwl3945_rs_sta *rs_sta = priv_sta;
431 * Be careful not to use any members of iwl3945_rs_sta (like trying
432 * to use iwl_priv to print out debugging) since it may not be fully
433 * initialized at this point.
435 del_timer_sync(&rs_sta->rate_scale_flush);
440 * rs_tx_status - Update rate control values based on Tx results
442 * NOTE: Uses iwl_priv->retry_rate for the # of retries attempted by
443 * the hardware for each rate.
445 static void rs_tx_status(void *priv_rate, struct ieee80211_supported_band *sband,
446 struct ieee80211_sta *sta, void *priv_sta,
449 s8 retries = 0, current_count;
450 int scale_rate_index, first_index, last_index;
452 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
453 struct iwl3945_rs_sta *rs_sta = priv_sta;
454 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
456 IWL_DEBUG_RATE(priv, "enter\n");
458 retries = info->status.rates[0].count;
459 /* Sanity Check for retries */
460 if (retries > IWL_RATE_RETRY_TH)
461 retries = IWL_RATE_RETRY_TH;
463 first_index = sband->bitrates[info->status.rates[0].idx].hw_value;
464 if ((first_index < 0) || (first_index >= IWL_RATE_COUNT_3945)) {
465 IWL_DEBUG_RATE(priv, "leave: Rate out of bounds: %d\n", first_index);
470 IWL_DEBUG_RATE(priv, "leave: No STA priv data to update!\n");
474 /* Treat uninitialized rate scaling data same as non-existing. */
476 IWL_DEBUG_RATE(priv, "leave: STA priv data uninitialized!\n");
481 rs_sta->tx_packets++;
483 scale_rate_index = first_index;
484 last_index = first_index;
487 * Update the window for each rate. We determine which rates
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
490 * priv value 'retry_rate' vs. rate specific
492 * On exit from this while loop last_index indicates the rate
493 * at which the frame was finally transmitted (or failed if no
496 while (retries > 1) {
497 if ((retries - 1) < priv->retry_rate) {
498 current_count = (retries - 1);
499 last_index = scale_rate_index;
501 current_count = priv->retry_rate;
502 last_index = iwl3945_rs_next_rate(priv,
506 /* Update this rate accounting for as many retries
507 * as was used for it (per current_count) */
508 iwl3945_collect_tx_data(rs_sta,
509 &rs_sta->win[scale_rate_index],
510 0, current_count, scale_rate_index);
511 IWL_DEBUG_RATE(priv, "Update rate %d for %d retries.\n",
512 scale_rate_index, current_count);
514 retries -= current_count;
516 scale_rate_index = last_index;
520 /* Update the last index window with success/failure based on ACK */
521 IWL_DEBUG_RATE(priv, "Update rate %d with %s.\n",
523 (info->flags & IEEE80211_TX_STAT_ACK) ?
524 "success" : "failure");
525 iwl3945_collect_tx_data(rs_sta,
526 &rs_sta->win[last_index],
527 info->flags & IEEE80211_TX_STAT_ACK, 1, last_index);
529 /* We updated the rate scale window -- if its been more than
530 * flush_time since the last run, schedule the flush
532 spin_lock_irqsave(&rs_sta->lock, flags);
534 if (!rs_sta->flush_pending &&
535 time_after(jiffies, rs_sta->last_flush +
536 rs_sta->flush_time)) {
538 rs_sta->last_partial_flush = jiffies;
539 rs_sta->flush_pending = 1;
540 mod_timer(&rs_sta->rate_scale_flush,
541 jiffies + rs_sta->flush_time);
544 spin_unlock_irqrestore(&rs_sta->lock, flags);
546 IWL_DEBUG_RATE(priv, "leave\n");
551 static u16 iwl3945_get_adjacent_rate(struct iwl3945_rs_sta *rs_sta,
552 u8 index, u16 rate_mask, enum ieee80211_band band)
554 u8 high = IWL_RATE_INVALID;
555 u8 low = IWL_RATE_INVALID;
556 struct iwl_priv *priv __maybe_unused = rs_sta->priv;
558 /* 802.11A walks to the next literal adjacent rate in
560 if (unlikely(band == IEEE80211_BAND_5GHZ)) {
564 /* Find the previous rate that is in the rate mask */
566 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
567 if (rate_mask & mask) {
573 /* Find the next rate that is in the rate mask */
575 for (mask = (1 << i); i < IWL_RATE_COUNT_3945;
577 if (rate_mask & mask) {
583 return (high << 8) | low;
587 while (low != IWL_RATE_INVALID) {
589 low = iwl3945_rates[low].prev_rs_tgg;
591 low = iwl3945_rates[low].prev_rs;
592 if (low == IWL_RATE_INVALID)
594 if (rate_mask & (1 << low))
596 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
600 while (high != IWL_RATE_INVALID) {
602 high = iwl3945_rates[high].next_rs_tgg;
604 high = iwl3945_rates[high].next_rs;
605 if (high == IWL_RATE_INVALID)
607 if (rate_mask & (1 << high))
609 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
612 return (high << 8) | low;
616 * rs_get_rate - find the rate for the requested packet
618 * Returns the ieee80211_rate structure allocated by the driver.
620 * The rate control algorithm has no internal mapping between hw_mode's
621 * rate ordering and the rate ordering used by the rate control algorithm.
623 * The rate control algorithm uses a single table of rates that goes across
624 * the entire A/B/G spectrum vs. being limited to just one particular
627 * As such, we can't convert the index obtained below into the hw_mode's
628 * rate table and must reference the driver allocated rate table
631 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta,
632 void *priv_sta, struct ieee80211_tx_rate_control *txrc)
634 struct ieee80211_supported_band *sband = txrc->sband;
635 struct sk_buff *skb = txrc->skb;
636 u8 low = IWL_RATE_INVALID;
637 u8 high = IWL_RATE_INVALID;
640 struct iwl3945_rs_sta *rs_sta = priv_sta;
641 struct iwl3945_rate_scale_data *window = NULL;
642 int current_tpt = IWL_INVALID_VALUE;
643 int low_tpt = IWL_INVALID_VALUE;
644 int high_tpt = IWL_INVALID_VALUE;
648 u16 rate_mask = sta ? sta->supp_rates[sband->band] : 0;
649 s8 max_rate_idx = -1;
650 struct iwl_priv *priv __maybe_unused = (struct iwl_priv *)priv_r;
651 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
653 IWL_DEBUG_RATE(priv, "enter\n");
655 /* Treat uninitialized rate scaling data same as non-existing. */
656 if (rs_sta && !rs_sta->priv) {
657 IWL_DEBUG_RATE(priv, "Rate scaling information not initialized yet.\n");
661 if (rate_control_send_low(sta, priv_sta, txrc))
664 rate_mask = sta->supp_rates[sband->band];
666 /* get user max rate if set */
667 max_rate_idx = txrc->max_rate_idx;
668 if ((sband->band == IEEE80211_BAND_5GHZ) && (max_rate_idx != -1))
669 max_rate_idx += IWL_FIRST_OFDM_RATE;
670 if ((max_rate_idx < 0) || (max_rate_idx >= IWL_RATE_COUNT))
673 index = min(rs_sta->last_txrate_idx & 0xffff, IWL_RATE_COUNT_3945 - 1);
675 if (sband->band == IEEE80211_BAND_5GHZ)
676 rate_mask = rate_mask << IWL_FIRST_OFDM_RATE;
678 spin_lock_irqsave(&rs_sta->lock, flags);
680 /* for recent assoc, choose best rate regarding
683 if (rs_sta->start_rate != IWL_RATE_INVALID) {
684 if (rs_sta->start_rate < index &&
685 (rate_mask & (1 << rs_sta->start_rate)))
686 index = rs_sta->start_rate;
687 rs_sta->start_rate = IWL_RATE_INVALID;
690 /* force user max rate if set by user */
691 if ((max_rate_idx != -1) && (max_rate_idx < index)) {
692 if (rate_mask & (1 << max_rate_idx))
693 index = max_rate_idx;
696 window = &(rs_sta->win[index]);
698 fail_count = window->counter - window->success_counter;
700 if (((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
701 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))) {
702 spin_unlock_irqrestore(&rs_sta->lock, flags);
704 IWL_DEBUG_RATE(priv, "Invalid average_tpt on rate %d: "
705 "counter: %d, success_counter: %d, "
706 "expected_tpt is %sNULL\n",
709 window->success_counter,
710 rs_sta->expected_tpt ? "not " : "");
712 /* Can't calculate this yet; not enough history */
713 window->average_tpt = IWL_INVALID_VALUE;
718 current_tpt = window->average_tpt;
720 high_low = iwl3945_get_adjacent_rate(rs_sta, index, rate_mask,
722 low = high_low & 0xff;
723 high = (high_low >> 8) & 0xff;
725 /* If user set max rate, dont allow higher than user constrain */
726 if ((max_rate_idx != -1) && (max_rate_idx < high))
727 high = IWL_RATE_INVALID;
729 /* Collect Measured throughputs of adjacent rates */
730 if (low != IWL_RATE_INVALID)
731 low_tpt = rs_sta->win[low].average_tpt;
733 if (high != IWL_RATE_INVALID)
734 high_tpt = rs_sta->win[high].average_tpt;
736 spin_unlock_irqrestore(&rs_sta->lock, flags);
740 /* Low success ratio , need to drop the rate */
741 if ((window->success_ratio < IWL_RATE_DECREASE_TH) || !current_tpt) {
742 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
744 /* No throughput measured yet for adjacent rates,
746 } else if ((low_tpt == IWL_INVALID_VALUE) &&
747 (high_tpt == IWL_INVALID_VALUE)) {
749 if (high != IWL_RATE_INVALID && window->success_ratio >= IWL_RATE_INCREASE_TH)
751 else if (low != IWL_RATE_INVALID)
754 /* Both adjacent throughputs are measured, but neither one has
755 * better throughput; we're using the best rate, don't change
757 } else if ((low_tpt != IWL_INVALID_VALUE) &&
758 (high_tpt != IWL_INVALID_VALUE) &&
759 (low_tpt < current_tpt) && (high_tpt < current_tpt)) {
761 IWL_DEBUG_RATE(priv, "No action -- low [%d] & high [%d] < "
762 "current_tpt [%d]\n",
763 low_tpt, high_tpt, current_tpt);
766 /* At least one of the rates has better throughput */
768 if (high_tpt != IWL_INVALID_VALUE) {
770 /* High rate has better throughput, Increase
772 if (high_tpt > current_tpt &&
773 window->success_ratio >= IWL_RATE_INCREASE_TH)
777 "decrease rate because of high tpt\n");
780 } else if (low_tpt != IWL_INVALID_VALUE) {
781 if (low_tpt > current_tpt) {
783 "decrease rate because of low tpt\n");
785 } else if (window->success_ratio >= IWL_RATE_INCREASE_TH) {
786 /* Lower rate has better
787 * throughput,decrease rate */
793 /* Sanity check; asked for decrease, but success rate or throughput
794 * has been good at old rate. Don't change it. */
795 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
796 ((window->success_ratio > IWL_RATE_HIGH_TH) ||
797 (current_tpt > (100 * rs_sta->expected_tpt[low]))))
800 switch (scale_action) {
804 if (low != IWL_RATE_INVALID)
810 if (high != IWL_RATE_INVALID)
821 IWL_DEBUG_RATE(priv, "Selected %d (action %d) - low %d high %d\n",
822 index, scale_action, low, high);
826 rs_sta->last_txrate_idx = index;
827 if (sband->band == IEEE80211_BAND_5GHZ)
828 info->control.rates[0].idx = rs_sta->last_txrate_idx -
831 info->control.rates[0].idx = rs_sta->last_txrate_idx;
833 IWL_DEBUG_RATE(priv, "leave: %d\n", index);
836 #ifdef CONFIG_MAC80211_DEBUGFS
837 static int iwl3945_open_file_generic(struct inode *inode, struct file *file)
839 file->private_data = inode->i_private;
843 static ssize_t iwl3945_sta_dbgfs_stats_table_read(struct file *file,
844 char __user *user_buf,
845 size_t count, loff_t *ppos)
851 struct iwl3945_rs_sta *lq_sta = file->private_data;
853 buff = kmalloc(1024, GFP_KERNEL);
857 desc += sprintf(buff + desc, "tx packets=%d last rate index=%d\n"
858 "rate=0x%X flush time %d\n",
860 lq_sta->last_txrate_idx,
861 lq_sta->start_rate, jiffies_to_msecs(lq_sta->flush_time));
862 for (j = 0; j < IWL_RATE_COUNT_3945; j++) {
863 desc += sprintf(buff+desc,
864 "counter=%d success=%d %%=%d\n",
865 lq_sta->win[j].counter,
866 lq_sta->win[j].success_counter,
867 lq_sta->win[j].success_ratio);
869 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
874 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
875 .read = iwl3945_sta_dbgfs_stats_table_read,
876 .open = iwl3945_open_file_generic,
879 static void iwl3945_add_debugfs(void *priv, void *priv_sta,
882 struct iwl3945_rs_sta *lq_sta = priv_sta;
884 lq_sta->rs_sta_dbgfs_stats_table_file =
885 debugfs_create_file("rate_stats_table", 0600, dir,
886 lq_sta, &rs_sta_dbgfs_stats_table_ops);
890 static void iwl3945_remove_debugfs(void *priv, void *priv_sta)
892 struct iwl3945_rs_sta *lq_sta = priv_sta;
893 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
898 * Initialization of rate scaling information is done by driver after
899 * the station is added. Since mac80211 calls this function before a
900 * station is added we ignore it.
902 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
903 struct ieee80211_sta *sta, void *priv_sta)
907 static struct rate_control_ops rs_ops = {
910 .tx_status = rs_tx_status,
911 .get_rate = rs_get_rate,
912 .rate_init = rs_rate_init_stub,
915 .alloc_sta = rs_alloc_sta,
916 .free_sta = rs_free_sta,
917 #ifdef CONFIG_MAC80211_DEBUGFS
918 .add_sta_debugfs = iwl3945_add_debugfs,
919 .remove_sta_debugfs = iwl3945_remove_debugfs,
923 void iwl3945_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
925 struct iwl_priv *priv = hw->priv;
928 struct iwl3945_rs_sta *rs_sta;
929 struct ieee80211_sta *sta;
930 struct iwl3945_sta_priv *psta;
932 IWL_DEBUG_RATE(priv, "enter\n");
936 sta = ieee80211_find_sta(priv->vif,
937 priv->stations[sta_id].sta.sta.addr);
939 IWL_DEBUG_RATE(priv, "Unable to find station to initialize rate scaling.\n");
944 psta = (void *) sta->drv_priv;
945 rs_sta = &psta->rs_sta;
947 spin_lock_irqsave(&rs_sta->lock, flags);
950 switch (priv->band) {
951 case IEEE80211_BAND_2GHZ:
952 /* TODO: this always does G, not a regression */
953 if (priv->active_rxon.flags & RXON_FLG_TGG_PROTECT_MSK) {
955 rs_sta->expected_tpt = iwl3945_expected_tpt_g_prot;
957 rs_sta->expected_tpt = iwl3945_expected_tpt_g;
960 case IEEE80211_BAND_5GHZ:
961 rs_sta->expected_tpt = iwl3945_expected_tpt_a;
963 case IEEE80211_NUM_BANDS:
968 spin_unlock_irqrestore(&rs_sta->lock, flags);
970 rssi = priv->_3945.last_rx_rssi;
972 rssi = IWL_MIN_RSSI_VAL;
974 IWL_DEBUG_RATE(priv, "Network RSSI: %d\n", rssi);
976 rs_sta->start_rate = iwl3945_get_rate_index_by_rssi(rssi, priv->band);
978 IWL_DEBUG_RATE(priv, "leave: rssi %d assign rate index: "
979 "%d (plcp 0x%x)\n", rssi, rs_sta->start_rate,
980 iwl3945_rates[rs_sta->start_rate].plcp);
984 int iwl3945_rate_control_register(void)
986 return ieee80211_rate_control_register(&rs_ops);
989 void iwl3945_rate_control_unregister(void)
991 ieee80211_rate_control_unregister(&rs_ops);