1 /******************************************************************************
3 * Copyright(c) 2005 - 2011 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/skbuff.h>
29 #include <linux/slab.h>
30 #include <net/mac80211.h>
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/delay.h>
36 #include <linux/workqueue.h>
41 #define RS_NAME "iwl-3945-rs"
43 static s32 il3945_expected_tpt_g[RATE_COUNT_3945] = {
44 7, 13, 35, 58, 0, 0, 76, 104, 130, 168, 191, 202
47 static s32 il3945_expected_tpt_g_prot[RATE_COUNT_3945] = {
48 7, 13, 35, 58, 0, 0, 0, 80, 93, 113, 123, 125
51 static s32 il3945_expected_tpt_a[RATE_COUNT_3945] = {
52 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186
55 static s32 il3945_expected_tpt_b[RATE_COUNT_3945] = {
56 7, 13, 35, 58, 0, 0, 0, 0, 0, 0, 0, 0
59 struct il3945_tpt_entry {
64 static struct il3945_tpt_entry il3945_tpt_table_a[] = {
75 static struct il3945_tpt_entry il3945_tpt_table_g[] = {
88 #define RATE_MAX_WINDOW 62
89 #define RATE_FLUSH (3*HZ)
90 #define RATE_WIN_FLUSH (HZ/2)
91 #define IL39_RATE_HIGH_TH 11520
92 #define IL_SUCCESS_UP_TH 8960
93 #define IL_SUCCESS_DOWN_TH 10880
94 #define RATE_MIN_FAILURE_TH 6
95 #define RATE_MIN_SUCCESS_TH 8
96 #define RATE_DECREASE_TH 1920
97 #define RATE_RETRY_TH 15
100 il3945_get_rate_idx_by_rssi(s32 rssi, enum ieee80211_band band)
104 struct il3945_tpt_entry *tpt_table = NULL;
106 if (rssi < IL_MIN_RSSI_VAL || rssi > IL_MAX_RSSI_VAL)
107 rssi = IL_MIN_RSSI_VAL;
110 case IEEE80211_BAND_2GHZ:
111 tpt_table = il3945_tpt_table_g;
112 table_size = ARRAY_SIZE(il3945_tpt_table_g);
114 case IEEE80211_BAND_5GHZ:
115 tpt_table = il3945_tpt_table_a;
116 table_size = ARRAY_SIZE(il3945_tpt_table_a);
123 while (idx < table_size && rssi < tpt_table[idx].min_rssi)
126 idx = min(idx, table_size - 1);
128 return tpt_table[idx].idx;
132 il3945_clear_win(struct il3945_rate_scale_data *win)
135 win->success_counter = 0;
136 win->success_ratio = -1;
138 win->average_tpt = IL_INVALID_VALUE;
143 * il3945_rate_scale_flush_wins - flush out the rate scale wins
145 * Returns the number of wins that have gathered data but were
146 * not flushed. If there were any that were not flushed, then
147 * reschedule the rate flushing routine.
150 il3945_rate_scale_flush_wins(struct il3945_rs_sta *rs_sta)
155 struct il_priv *il __maybe_unused = rs_sta->il;
158 * For each rate, if we have collected data on that rate
159 * and it has been more than RATE_WIN_FLUSH
160 * since we flushed, clear out the gathered stats
162 for (i = 0; i < RATE_COUNT_3945; i++) {
163 if (!rs_sta->win[i].counter)
166 spin_lock_irqsave(&rs_sta->lock, flags);
167 if (time_after(jiffies, rs_sta->win[i].stamp + RATE_WIN_FLUSH)) {
168 D_RATE("flushing %d samples of rate " "idx %d\n",
169 rs_sta->win[i].counter, i);
170 il3945_clear_win(&rs_sta->win[i]);
173 spin_unlock_irqrestore(&rs_sta->lock, flags);
179 #define RATE_FLUSH_MAX 5000 /* msec */
180 #define RATE_FLUSH_MIN 50 /* msec */
181 #define IL_AVERAGE_PACKETS 1500
184 il3945_bg_rate_scale_flush(unsigned long data)
186 struct il3945_rs_sta *rs_sta = (void *)data;
187 struct il_priv *il __maybe_unused = rs_sta->il;
190 u32 packet_count, duration, pps;
194 unflushed = il3945_rate_scale_flush_wins(rs_sta);
196 spin_lock_irqsave(&rs_sta->lock, flags);
198 /* Number of packets Rx'd since last time this timer ran */
199 packet_count = (rs_sta->tx_packets - rs_sta->last_tx_packets) + 1;
201 rs_sta->last_tx_packets = rs_sta->tx_packets + 1;
205 jiffies_to_msecs(jiffies - rs_sta->last_partial_flush);
207 D_RATE("Tx'd %d packets in %dms\n", packet_count, duration);
209 /* Determine packets per second */
211 pps = (packet_count * 1000) / duration;
216 duration = (IL_AVERAGE_PACKETS * 1000) / pps;
217 if (duration < RATE_FLUSH_MIN)
218 duration = RATE_FLUSH_MIN;
219 else if (duration > RATE_FLUSH_MAX)
220 duration = RATE_FLUSH_MAX;
222 duration = RATE_FLUSH_MAX;
224 rs_sta->flush_time = msecs_to_jiffies(duration);
226 D_RATE("new flush period: %d msec ave %d\n", duration,
229 mod_timer(&rs_sta->rate_scale_flush,
230 jiffies + rs_sta->flush_time);
232 rs_sta->last_partial_flush = jiffies;
234 rs_sta->flush_time = RATE_FLUSH;
235 rs_sta->flush_pending = 0;
237 /* If there weren't any unflushed entries, we don't schedule the timer
240 rs_sta->last_flush = jiffies;
242 spin_unlock_irqrestore(&rs_sta->lock, flags);
248 * il3945_collect_tx_data - Update the success/failure sliding win
250 * We keep a sliding win of the last 64 packets transmitted
251 * at this rate. win->data contains the bitmask of successful
255 il3945_collect_tx_data(struct il3945_rs_sta *rs_sta,
256 struct il3945_rate_scale_data *win, int success,
257 int retries, int idx)
261 struct il_priv *il __maybe_unused = rs_sta->il;
264 D_RATE("leave: retries == 0 -- should be at least 1\n");
268 spin_lock_irqsave(&rs_sta->lock, flags);
271 * Keep track of only the latest 62 tx frame attempts in this rate's
272 * history win; anything older isn't really relevant any more.
273 * If we have filled up the sliding win, drop the oldest attempt;
274 * if the oldest attempt (highest bit in bitmap) shows "success",
275 * subtract "1" from the success counter (this is the main reason
276 * we keep these bitmaps!).
278 while (retries > 0) {
279 if (win->counter >= RATE_MAX_WINDOW) {
281 /* remove earliest */
282 win->counter = RATE_MAX_WINDOW - 1;
284 if (win->data & (1ULL << (RATE_MAX_WINDOW - 1))) {
285 win->data &= ~(1ULL << (RATE_MAX_WINDOW - 1));
286 win->success_counter--;
290 /* Increment frames-attempted counter */
293 /* Shift bitmap by one frame (throw away oldest history),
294 * OR in "1", and increment "success" if this
295 * frame was successful. */
298 win->success_counter++;
306 /* Calculate current success ratio, avoid divide-by-0! */
307 if (win->counter > 0)
309 128 * (100 * win->success_counter) / win->counter;
311 win->success_ratio = IL_INVALID_VALUE;
313 fail_count = win->counter - win->success_counter;
315 /* Calculate average throughput, if we have enough history. */
316 if (fail_count >= RATE_MIN_FAILURE_TH ||
317 win->success_counter >= RATE_MIN_SUCCESS_TH)
319 ((win->success_ratio * rs_sta->expected_tpt[idx] +
322 win->average_tpt = IL_INVALID_VALUE;
324 /* Tag this win as having been updated */
325 win->stamp = jiffies;
327 spin_unlock_irqrestore(&rs_sta->lock, flags);
331 * Called after adding a new station to initialize rate scaling
334 il3945_rs_rate_init(struct il_priv *il, struct ieee80211_sta *sta, u8 sta_id)
336 struct ieee80211_hw *hw = il->hw;
337 struct ieee80211_conf *conf = &il->hw->conf;
338 struct il3945_sta_priv *psta;
339 struct il3945_rs_sta *rs_sta;
340 struct ieee80211_supported_band *sband;
344 if (sta_id == il->hw_params.bcast_id)
347 psta = (struct il3945_sta_priv *)sta->drv_priv;
348 rs_sta = &psta->rs_sta;
349 sband = hw->wiphy->bands[conf->chandef.chan->band];
353 rs_sta->start_rate = RATE_INVALID;
355 /* default to just 802.11b */
356 rs_sta->expected_tpt = il3945_expected_tpt_b;
358 rs_sta->last_partial_flush = jiffies;
359 rs_sta->last_flush = jiffies;
360 rs_sta->flush_time = RATE_FLUSH;
361 rs_sta->last_tx_packets = 0;
363 rs_sta->rate_scale_flush.data = (unsigned long)rs_sta;
364 rs_sta->rate_scale_flush.function = il3945_bg_rate_scale_flush;
366 for (i = 0; i < RATE_COUNT_3945; i++)
367 il3945_clear_win(&rs_sta->win[i]);
369 /* TODO: what is a good starting rate for STA? About middle? Maybe not
370 * the lowest or the highest rate.. Could consider using RSSI from
371 * previous packets? Need to have IEEE 802.1X auth succeed immediately
374 for (i = sband->n_bitrates - 1; i >= 0; i--) {
375 if (sta->supp_rates[sband->band] & (1 << i)) {
376 rs_sta->last_txrate_idx = i;
381 il->_3945.sta_supp_rates = sta->supp_rates[sband->band];
382 /* For 5 GHz band it start at IL_FIRST_OFDM_RATE */
383 if (sband->band == IEEE80211_BAND_5GHZ) {
384 rs_sta->last_txrate_idx += IL_FIRST_OFDM_RATE;
385 il->_3945.sta_supp_rates <<= IL_FIRST_OFDM_RATE;
389 il->stations[sta_id].used &= ~IL_STA_UCODE_INPROGRESS;
395 il3945_rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
400 /* rate scale requires free function to be implemented */
402 il3945_rs_free(void *il)
407 il3945_rs_alloc_sta(void *il_priv, struct ieee80211_sta *sta, gfp_t gfp)
409 struct il3945_rs_sta *rs_sta;
410 struct il3945_sta_priv *psta = (void *)sta->drv_priv;
411 struct il_priv *il __maybe_unused = il_priv;
415 rs_sta = &psta->rs_sta;
417 spin_lock_init(&rs_sta->lock);
418 init_timer(&rs_sta->rate_scale_flush);
426 il3945_rs_free_sta(void *il_priv, struct ieee80211_sta *sta, void *il_sta)
428 struct il3945_rs_sta *rs_sta = il_sta;
431 * Be careful not to use any members of il3945_rs_sta (like trying
432 * to use il_priv to print out debugging) since it may not be fully
433 * initialized at this point.
435 del_timer_sync(&rs_sta->rate_scale_flush);
439 * il3945_rs_tx_status - Update rate control values based on Tx results
441 * NOTE: Uses il_priv->retry_rate for the # of retries attempted by
442 * the hardware for each rate.
445 il3945_rs_tx_status(void *il_rate, struct ieee80211_supported_band *sband,
446 struct ieee80211_sta *sta, void *il_sta,
449 s8 retries = 0, current_count;
450 int scale_rate_idx, first_idx, last_idx;
452 struct il_priv *il = (struct il_priv *)il_rate;
453 struct il3945_rs_sta *rs_sta = il_sta;
454 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
458 retries = info->status.rates[0].count;
459 /* Sanity Check for retries */
460 if (retries > RATE_RETRY_TH)
461 retries = RATE_RETRY_TH;
463 first_idx = sband->bitrates[info->status.rates[0].idx].hw_value;
464 if (first_idx < 0 || first_idx >= RATE_COUNT_3945) {
465 D_RATE("leave: Rate out of bounds: %d\n", first_idx);
470 D_RATE("leave: No STA il data to update!\n");
474 /* Treat uninitialized rate scaling data same as non-existing. */
476 D_RATE("leave: STA il data uninitialized!\n");
480 rs_sta->tx_packets++;
482 scale_rate_idx = first_idx;
483 last_idx = first_idx;
486 * Update the win for each rate. We determine which rates
487 * were Tx'd based on the total number of retries vs. the number
488 * of retries configured for each rate -- currently set to the
489 * il value 'retry_rate' vs. rate specific
491 * On exit from this while loop last_idx indicates the rate
492 * at which the frame was finally transmitted (or failed if no
495 while (retries > 1) {
496 if ((retries - 1) < il->retry_rate) {
497 current_count = (retries - 1);
498 last_idx = scale_rate_idx;
500 current_count = il->retry_rate;
501 last_idx = il3945_rs_next_rate(il, scale_rate_idx);
504 /* Update this rate accounting for as many retries
505 * as was used for it (per current_count) */
506 il3945_collect_tx_data(rs_sta, &rs_sta->win[scale_rate_idx], 0,
507 current_count, scale_rate_idx);
508 D_RATE("Update rate %d for %d retries.\n", scale_rate_idx,
511 retries -= current_count;
513 scale_rate_idx = last_idx;
516 /* Update the last idx win with success/failure based on ACK */
517 D_RATE("Update rate %d with %s.\n", last_idx,
518 (info->flags & IEEE80211_TX_STAT_ACK) ? "success" : "failure");
519 il3945_collect_tx_data(rs_sta, &rs_sta->win[last_idx],
520 info->flags & IEEE80211_TX_STAT_ACK, 1,
523 /* We updated the rate scale win -- if its been more than
524 * flush_time since the last run, schedule the flush
526 spin_lock_irqsave(&rs_sta->lock, flags);
528 if (!rs_sta->flush_pending &&
529 time_after(jiffies, rs_sta->last_flush + rs_sta->flush_time)) {
531 rs_sta->last_partial_flush = jiffies;
532 rs_sta->flush_pending = 1;
533 mod_timer(&rs_sta->rate_scale_flush,
534 jiffies + rs_sta->flush_time);
537 spin_unlock_irqrestore(&rs_sta->lock, flags);
543 il3945_get_adjacent_rate(struct il3945_rs_sta *rs_sta, u8 idx, u16 rate_mask,
544 enum ieee80211_band band)
546 u8 high = RATE_INVALID;
547 u8 low = RATE_INVALID;
548 struct il_priv *il __maybe_unused = rs_sta->il;
550 /* 802.11A walks to the next literal adjacent rate in
552 if (unlikely(band == IEEE80211_BAND_5GHZ)) {
556 /* Find the previous rate that is in the rate mask */
558 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
559 if (rate_mask & mask) {
565 /* Find the next rate that is in the rate mask */
567 for (mask = (1 << i); i < RATE_COUNT_3945; i++, mask <<= 1) {
568 if (rate_mask & mask) {
574 return (high << 8) | low;
578 while (low != RATE_INVALID) {
580 low = il3945_rates[low].prev_rs_tgg;
582 low = il3945_rates[low].prev_rs;
583 if (low == RATE_INVALID)
585 if (rate_mask & (1 << low))
587 D_RATE("Skipping masked lower rate: %d\n", low);
591 while (high != RATE_INVALID) {
593 high = il3945_rates[high].next_rs_tgg;
595 high = il3945_rates[high].next_rs;
596 if (high == RATE_INVALID)
598 if (rate_mask & (1 << high))
600 D_RATE("Skipping masked higher rate: %d\n", high);
603 return (high << 8) | low;
607 * il3945_rs_get_rate - find the rate for the requested packet
609 * Returns the ieee80211_rate structure allocated by the driver.
611 * The rate control algorithm has no internal mapping between hw_mode's
612 * rate ordering and the rate ordering used by the rate control algorithm.
614 * The rate control algorithm uses a single table of rates that goes across
615 * the entire A/B/G spectrum vs. being limited to just one particular
618 * As such, we can't convert the idx obtained below into the hw_mode's
619 * rate table and must reference the driver allocated rate table
623 il3945_rs_get_rate(void *il_r, struct ieee80211_sta *sta, void *il_sta,
624 struct ieee80211_tx_rate_control *txrc)
626 struct ieee80211_supported_band *sband = txrc->sband;
627 struct sk_buff *skb = txrc->skb;
628 u8 low = RATE_INVALID;
629 u8 high = RATE_INVALID;
632 struct il3945_rs_sta *rs_sta = il_sta;
633 struct il3945_rate_scale_data *win = NULL;
634 int current_tpt = IL_INVALID_VALUE;
635 int low_tpt = IL_INVALID_VALUE;
636 int high_tpt = IL_INVALID_VALUE;
641 s8 max_rate_idx = -1;
642 struct il_priv *il __maybe_unused = (struct il_priv *)il_r;
643 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
647 /* Treat uninitialized rate scaling data same as non-existing. */
648 if (rs_sta && !rs_sta->il) {
649 D_RATE("Rate scaling information not initialized yet.\n");
653 if (rate_control_send_low(sta, il_sta, txrc))
656 rate_mask = sta->supp_rates[sband->band];
658 /* get user max rate if set */
659 max_rate_idx = txrc->max_rate_idx;
660 if (sband->band == IEEE80211_BAND_5GHZ && max_rate_idx != -1)
661 max_rate_idx += IL_FIRST_OFDM_RATE;
662 if (max_rate_idx < 0 || max_rate_idx >= RATE_COUNT)
665 idx = min(rs_sta->last_txrate_idx & 0xffff, RATE_COUNT_3945 - 1);
667 if (sband->band == IEEE80211_BAND_5GHZ)
668 rate_mask = rate_mask << IL_FIRST_OFDM_RATE;
670 spin_lock_irqsave(&rs_sta->lock, flags);
672 /* for recent assoc, choose best rate regarding
675 if (rs_sta->start_rate != RATE_INVALID) {
676 if (rs_sta->start_rate < idx &&
677 (rate_mask & (1 << rs_sta->start_rate)))
678 idx = rs_sta->start_rate;
679 rs_sta->start_rate = RATE_INVALID;
682 /* force user max rate if set by user */
683 if (max_rate_idx != -1 && max_rate_idx < idx) {
684 if (rate_mask & (1 << max_rate_idx))
688 win = &(rs_sta->win[idx]);
690 fail_count = win->counter - win->success_counter;
692 if (fail_count < RATE_MIN_FAILURE_TH &&
693 win->success_counter < RATE_MIN_SUCCESS_TH) {
694 spin_unlock_irqrestore(&rs_sta->lock, flags);
696 D_RATE("Invalid average_tpt on rate %d: "
697 "counter: %d, success_counter: %d, "
698 "expected_tpt is %sNULL\n", idx, win->counter,
699 win->success_counter,
700 rs_sta->expected_tpt ? "not " : "");
702 /* Can't calculate this yet; not enough history */
703 win->average_tpt = IL_INVALID_VALUE;
708 current_tpt = win->average_tpt;
711 il3945_get_adjacent_rate(rs_sta, idx, rate_mask, sband->band);
712 low = high_low & 0xff;
713 high = (high_low >> 8) & 0xff;
715 /* If user set max rate, dont allow higher than user constrain */
716 if (max_rate_idx != -1 && max_rate_idx < high)
719 /* Collect Measured throughputs of adjacent rates */
720 if (low != RATE_INVALID)
721 low_tpt = rs_sta->win[low].average_tpt;
723 if (high != RATE_INVALID)
724 high_tpt = rs_sta->win[high].average_tpt;
726 spin_unlock_irqrestore(&rs_sta->lock, flags);
730 /* Low success ratio , need to drop the rate */
731 if (win->success_ratio < RATE_DECREASE_TH || !current_tpt) {
732 D_RATE("decrease rate because of low success_ratio\n");
734 /* No throughput measured yet for adjacent rates,
736 } else if (low_tpt == IL_INVALID_VALUE && high_tpt == IL_INVALID_VALUE) {
738 if (high != RATE_INVALID &&
739 win->success_ratio >= RATE_INCREASE_TH)
741 else if (low != RATE_INVALID)
744 /* Both adjacent throughputs are measured, but neither one has
745 * better throughput; we're using the best rate, don't change
747 } else if (low_tpt != IL_INVALID_VALUE && high_tpt != IL_INVALID_VALUE
748 && low_tpt < current_tpt && high_tpt < current_tpt) {
750 D_RATE("No action -- low [%d] & high [%d] < "
751 "current_tpt [%d]\n", low_tpt, high_tpt, current_tpt);
754 /* At least one of the rates has better throughput */
756 if (high_tpt != IL_INVALID_VALUE) {
758 /* High rate has better throughput, Increase
760 if (high_tpt > current_tpt &&
761 win->success_ratio >= RATE_INCREASE_TH)
764 D_RATE("decrease rate because of high tpt\n");
767 } else if (low_tpt != IL_INVALID_VALUE) {
768 if (low_tpt > current_tpt) {
769 D_RATE("decrease rate because of low tpt\n");
771 } else if (win->success_ratio >= RATE_INCREASE_TH) {
772 /* Lower rate has better
773 * throughput,decrease rate */
779 /* Sanity check; asked for decrease, but success rate or throughput
780 * has been good at old rate. Don't change it. */
781 if (scale_action == -1 && low != RATE_INVALID &&
782 (win->success_ratio > RATE_HIGH_TH ||
783 current_tpt > 100 * rs_sta->expected_tpt[low]))
786 switch (scale_action) {
789 if (low != RATE_INVALID)
794 if (high != RATE_INVALID)
804 D_RATE("Selected %d (action %d) - low %d high %d\n", idx, scale_action,
809 if (sband->band == IEEE80211_BAND_5GHZ) {
810 if (WARN_ON_ONCE(idx < IL_FIRST_OFDM_RATE))
811 idx = IL_FIRST_OFDM_RATE;
812 rs_sta->last_txrate_idx = idx;
813 info->control.rates[0].idx = idx - IL_FIRST_OFDM_RATE;
815 rs_sta->last_txrate_idx = idx;
816 info->control.rates[0].idx = rs_sta->last_txrate_idx;
818 info->control.rates[0].count = 1;
820 D_RATE("leave: %d\n", idx);
823 #ifdef CONFIG_MAC80211_DEBUGFS
826 il3945_sta_dbgfs_stats_table_read(struct file *file, char __user *user_buf,
827 size_t count, loff_t *ppos)
833 struct il3945_rs_sta *lq_sta = file->private_data;
835 buff = kmalloc(1024, GFP_KERNEL);
841 "tx packets=%d last rate idx=%d\n"
842 "rate=0x%X flush time %d\n", lq_sta->tx_packets,
843 lq_sta->last_txrate_idx, lq_sta->start_rate,
844 jiffies_to_msecs(lq_sta->flush_time));
845 for (j = 0; j < RATE_COUNT_3945; j++) {
847 sprintf(buff + desc, "counter=%d success=%d %%=%d\n",
848 lq_sta->win[j].counter,
849 lq_sta->win[j].success_counter,
850 lq_sta->win[j].success_ratio);
852 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
857 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
858 .read = il3945_sta_dbgfs_stats_table_read,
860 .llseek = default_llseek,
864 il3945_add_debugfs(void *il, void *il_sta, struct dentry *dir)
866 struct il3945_rs_sta *lq_sta = il_sta;
868 lq_sta->rs_sta_dbgfs_stats_table_file =
869 debugfs_create_file("rate_stats_table", 0600, dir, lq_sta,
870 &rs_sta_dbgfs_stats_table_ops);
875 il3945_remove_debugfs(void *il, void *il_sta)
877 struct il3945_rs_sta *lq_sta = il_sta;
878 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
883 * Initialization of rate scaling information is done by driver after
884 * the station is added. Since mac80211 calls this function before a
885 * station is added we ignore it.
888 il3945_rs_rate_init_stub(void *il_r, struct ieee80211_supported_band *sband,
889 struct cfg80211_chan_def *chandef,
890 struct ieee80211_sta *sta, void *il_sta)
894 static struct rate_control_ops rs_ops = {
897 .tx_status = il3945_rs_tx_status,
898 .get_rate = il3945_rs_get_rate,
899 .rate_init = il3945_rs_rate_init_stub,
900 .alloc = il3945_rs_alloc,
901 .free = il3945_rs_free,
902 .alloc_sta = il3945_rs_alloc_sta,
903 .free_sta = il3945_rs_free_sta,
904 #ifdef CONFIG_MAC80211_DEBUGFS
905 .add_sta_debugfs = il3945_add_debugfs,
906 .remove_sta_debugfs = il3945_remove_debugfs,
912 il3945_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
914 struct il_priv *il = hw->priv;
917 struct il3945_rs_sta *rs_sta;
918 struct ieee80211_sta *sta;
919 struct il3945_sta_priv *psta;
925 sta = ieee80211_find_sta(il->vif, il->stations[sta_id].sta.sta.addr);
927 D_RATE("Unable to find station to initialize rate scaling.\n");
932 psta = (void *)sta->drv_priv;
933 rs_sta = &psta->rs_sta;
935 spin_lock_irqsave(&rs_sta->lock, flags);
939 case IEEE80211_BAND_2GHZ:
940 /* TODO: this always does G, not a regression */
941 if (il->active.flags & RXON_FLG_TGG_PROTECT_MSK) {
943 rs_sta->expected_tpt = il3945_expected_tpt_g_prot;
945 rs_sta->expected_tpt = il3945_expected_tpt_g;
947 case IEEE80211_BAND_5GHZ:
948 rs_sta->expected_tpt = il3945_expected_tpt_a;
955 spin_unlock_irqrestore(&rs_sta->lock, flags);
957 rssi = il->_3945.last_rx_rssi;
959 rssi = IL_MIN_RSSI_VAL;
961 D_RATE("Network RSSI: %d\n", rssi);
963 rs_sta->start_rate = il3945_get_rate_idx_by_rssi(rssi, il->band);
965 D_RATE("leave: rssi %d assign rate idx: " "%d (plcp 0x%x)\n", rssi,
966 rs_sta->start_rate, il3945_rates[rs_sta->start_rate].plcp);
971 il3945_rate_control_register(void)
973 return ieee80211_rate_control_register(&rs_ops);
977 il3945_rate_control_unregister(void)
979 ieee80211_rate_control_unregister(&rs_ops);