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/init.h>
29 #include <linux/skbuff.h>
30 #include <linux/slab.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>
42 #define RS_NAME "iwl-3945-rs"
44 static s32 il3945_expected_tpt_g[RATE_COUNT_3945] = {
45 7, 13, 35, 58, 0, 0, 76, 104, 130, 168, 191, 202
48 static s32 il3945_expected_tpt_g_prot[RATE_COUNT_3945] = {
49 7, 13, 35, 58, 0, 0, 0, 80, 93, 113, 123, 125
52 static s32 il3945_expected_tpt_a[RATE_COUNT_3945] = {
53 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186
56 static s32 il3945_expected_tpt_b[RATE_COUNT_3945] = {
57 7, 13, 35, 58, 0, 0, 0, 0, 0, 0, 0, 0
60 struct il3945_tpt_entry {
65 static struct il3945_tpt_entry il3945_tpt_table_a[] = {
76 static struct il3945_tpt_entry il3945_tpt_table_g[] = {
89 #define RATE_MAX_WINDOW 62
90 #define RATE_FLUSH (3*HZ)
91 #define RATE_WIN_FLUSH (HZ/2)
92 #define IL39_RATE_HIGH_TH 11520
93 #define IL_SUCCESS_UP_TH 8960
94 #define IL_SUCCESS_DOWN_TH 10880
95 #define RATE_MIN_FAILURE_TH 6
96 #define RATE_MIN_SUCCESS_TH 8
97 #define RATE_DECREASE_TH 1920
98 #define RATE_RETRY_TH 15
101 il3945_get_rate_idx_by_rssi(s32 rssi, enum ieee80211_band band)
105 struct il3945_tpt_entry *tpt_table = NULL;
107 if (rssi < IL_MIN_RSSI_VAL || rssi > IL_MAX_RSSI_VAL)
108 rssi = IL_MIN_RSSI_VAL;
111 case IEEE80211_BAND_2GHZ:
112 tpt_table = il3945_tpt_table_g;
113 table_size = ARRAY_SIZE(il3945_tpt_table_g);
116 case IEEE80211_BAND_5GHZ:
117 tpt_table = il3945_tpt_table_a;
118 table_size = ARRAY_SIZE(il3945_tpt_table_a);
126 while (idx < table_size && rssi < tpt_table[idx].min_rssi)
129 idx = min(idx, (table_size - 1));
131 return tpt_table[idx].idx;
135 il3945_clear_win(struct il3945_rate_scale_data *win)
138 win->success_counter = 0;
139 win->success_ratio = -1;
141 win->average_tpt = IL_INVALID_VALUE;
146 * il3945_rate_scale_flush_wins - flush out the rate scale wins
148 * Returns the number of wins that have gathered data but were
149 * not flushed. If there were any that were not flushed, then
150 * reschedule the rate flushing routine.
153 il3945_rate_scale_flush_wins(struct il3945_rs_sta *rs_sta)
158 struct il_priv *il __maybe_unused = rs_sta->il;
161 * For each rate, if we have collected data on that rate
162 * and it has been more than RATE_WIN_FLUSH
163 * since we flushed, clear out the gathered stats
165 for (i = 0; i < RATE_COUNT_3945; i++) {
166 if (!rs_sta->win[i].counter)
169 spin_lock_irqsave(&rs_sta->lock, flags);
170 if (time_after(jiffies, rs_sta->win[i].stamp + RATE_WIN_FLUSH)) {
171 D_RATE("flushing %d samples of rate " "idx %d\n",
172 rs_sta->win[i].counter, i);
173 il3945_clear_win(&rs_sta->win[i]);
176 spin_unlock_irqrestore(&rs_sta->lock, flags);
182 #define RATE_FLUSH_MAX 5000 /* msec */
183 #define RATE_FLUSH_MIN 50 /* msec */
184 #define IL_AVERAGE_PACKETS 1500
187 il3945_bg_rate_scale_flush(unsigned long data)
189 struct il3945_rs_sta *rs_sta = (void *)data;
190 struct il_priv *il __maybe_unused = rs_sta->il;
193 u32 packet_count, duration, pps;
197 unflushed = il3945_rate_scale_flush_wins(rs_sta);
199 spin_lock_irqsave(&rs_sta->lock, flags);
201 /* Number of packets Rx'd since last time this timer ran */
202 packet_count = (rs_sta->tx_packets - rs_sta->last_tx_packets) + 1;
204 rs_sta->last_tx_packets = rs_sta->tx_packets + 1;
208 jiffies_to_msecs(jiffies - rs_sta->last_partial_flush);
210 D_RATE("Tx'd %d packets in %dms\n", packet_count, duration);
212 /* Determine packets per second */
214 pps = (packet_count * 1000) / duration;
219 duration = (IL_AVERAGE_PACKETS * 1000) / pps;
220 if (duration < RATE_FLUSH_MIN)
221 duration = RATE_FLUSH_MIN;
222 else if (duration > RATE_FLUSH_MAX)
223 duration = RATE_FLUSH_MAX;
225 duration = RATE_FLUSH_MAX;
227 rs_sta->flush_time = msecs_to_jiffies(duration);
229 D_RATE("new flush period: %d msec ave %d\n", duration,
232 mod_timer(&rs_sta->rate_scale_flush,
233 jiffies + rs_sta->flush_time);
235 rs_sta->last_partial_flush = jiffies;
237 rs_sta->flush_time = 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);
251 * il3945_collect_tx_data - Update the success/failure sliding win
253 * We keep a sliding win of the last 64 packets transmitted
254 * at this rate. win->data contains the bitmask of successful
258 il3945_collect_tx_data(struct il3945_rs_sta *rs_sta,
259 struct il3945_rate_scale_data *win, int success,
260 int retries, int idx)
264 struct il_priv *il __maybe_unused = rs_sta->il;
267 D_RATE("leave: retries == 0 -- should be at least 1\n");
271 spin_lock_irqsave(&rs_sta->lock, flags);
274 * Keep track of only the latest 62 tx frame attempts in this rate's
275 * history win; anything older isn't really relevant any more.
276 * If we have filled up the sliding win, drop the oldest attempt;
277 * if the oldest attempt (highest bit in bitmap) shows "success",
278 * subtract "1" from the success counter (this is the main reason
279 * we keep these bitmaps!).
281 while (retries > 0) {
282 if (win->counter >= RATE_MAX_WINDOW) {
284 /* remove earliest */
285 win->counter = RATE_MAX_WINDOW - 1;
287 if (win->data & (1ULL << (RATE_MAX_WINDOW - 1))) {
288 win->data &= ~(1ULL << (RATE_MAX_WINDOW - 1));
289 win->success_counter--;
293 /* Increment frames-attempted counter */
296 /* Shift bitmap by one frame (throw away oldest history),
297 * OR in "1", and increment "success" if this
298 * frame was successful. */
301 win->success_counter++;
309 /* Calculate current success ratio, avoid divide-by-0! */
310 if (win->counter > 0)
312 128 * (100 * win->success_counter) / win->counter;
314 win->success_ratio = IL_INVALID_VALUE;
316 fail_count = win->counter - win->success_counter;
318 /* Calculate average throughput, if we have enough history. */
319 if (fail_count >= RATE_MIN_FAILURE_TH ||
320 win->success_counter >= RATE_MIN_SUCCESS_TH)
322 ((win->success_ratio * rs_sta->expected_tpt[idx] +
325 win->average_tpt = IL_INVALID_VALUE;
327 /* Tag this win as having been updated */
328 win->stamp = jiffies;
330 spin_unlock_irqrestore(&rs_sta->lock, flags);
335 * Called after adding a new station to initialize rate scaling
338 il3945_rs_rate_init(struct il_priv *il, struct ieee80211_sta *sta, u8 sta_id)
340 struct ieee80211_hw *hw = il->hw;
341 struct ieee80211_conf *conf = &il->hw->conf;
342 struct il3945_sta_priv *psta;
343 struct il3945_rs_sta *rs_sta;
344 struct ieee80211_supported_band *sband;
348 if (sta_id == il->ctx.bcast_sta_id)
351 psta = (struct il3945_sta_priv *)sta->drv_priv;
352 rs_sta = &psta->rs_sta;
353 sband = hw->wiphy->bands[conf->channel->band];
357 rs_sta->start_rate = RATE_INVALID;
359 /* default to just 802.11b */
360 rs_sta->expected_tpt = il3945_expected_tpt_b;
362 rs_sta->last_partial_flush = jiffies;
363 rs_sta->last_flush = jiffies;
364 rs_sta->flush_time = RATE_FLUSH;
365 rs_sta->last_tx_packets = 0;
367 rs_sta->rate_scale_flush.data = (unsigned long)rs_sta;
368 rs_sta->rate_scale_flush.function = il3945_bg_rate_scale_flush;
370 for (i = 0; i < RATE_COUNT_3945; i++)
371 il3945_clear_win(&rs_sta->win[i]);
373 /* TODO: what is a good starting rate for STA? About middle? Maybe not
374 * the lowest or the highest rate.. Could consider using RSSI from
375 * previous packets? Need to have IEEE 802.1X auth succeed immediately
378 for (i = sband->n_bitrates - 1; i >= 0; i--) {
379 if (sta->supp_rates[sband->band] & (1 << i)) {
380 rs_sta->last_txrate_idx = i;
385 il->_3945.sta_supp_rates = sta->supp_rates[sband->band];
386 /* For 5 GHz band it start at IL_FIRST_OFDM_RATE */
387 if (sband->band == IEEE80211_BAND_5GHZ) {
388 rs_sta->last_txrate_idx += IL_FIRST_OFDM_RATE;
389 il->_3945.sta_supp_rates =
390 il->_3945.sta_supp_rates << IL_FIRST_OFDM_RATE;
394 il->stations[sta_id].used &= ~IL_STA_UCODE_INPROGRESS;
400 il3945_rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
405 /* rate scale requires free function to be implemented */
407 il3945_rs_free(void *il)
413 il3945_rs_alloc_sta(void *il_priv, struct ieee80211_sta *sta, gfp_t gfp)
415 struct il3945_rs_sta *rs_sta;
416 struct il3945_sta_priv *psta = (void *)sta->drv_priv;
417 struct il_priv *il __maybe_unused = il_priv;
421 rs_sta = &psta->rs_sta;
423 spin_lock_init(&rs_sta->lock);
424 init_timer(&rs_sta->rate_scale_flush);
432 il3945_rs_free_sta(void *il_priv, struct ieee80211_sta *sta, void *il_sta)
434 struct il3945_rs_sta *rs_sta = il_sta;
437 * Be careful not to use any members of il3945_rs_sta (like trying
438 * to use il_priv to print out debugging) since it may not be fully
439 * initialized at this point.
441 del_timer_sync(&rs_sta->rate_scale_flush);
445 * il3945_rs_tx_status - Update rate control values based on Tx results
447 * NOTE: Uses il_priv->retry_rate for the # of retries attempted by
448 * the hardware for each rate.
451 il3945_rs_tx_status(void *il_rate, struct ieee80211_supported_band *sband,
452 struct ieee80211_sta *sta, void *il_sta,
455 s8 retries = 0, current_count;
456 int scale_rate_idx, first_idx, last_idx;
458 struct il_priv *il = (struct il_priv *)il_rate;
459 struct il3945_rs_sta *rs_sta = il_sta;
460 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
464 retries = info->status.rates[0].count;
465 /* Sanity Check for retries */
466 if (retries > RATE_RETRY_TH)
467 retries = RATE_RETRY_TH;
469 first_idx = sband->bitrates[info->status.rates[0].idx].hw_value;
470 if (first_idx < 0 || first_idx >= RATE_COUNT_3945) {
471 D_RATE("leave: Rate out of bounds: %d\n", first_idx);
476 D_RATE("leave: No STA il data to update!\n");
480 /* Treat uninitialized rate scaling data same as non-existing. */
482 D_RATE("leave: STA il data uninitialized!\n");
486 rs_sta->tx_packets++;
488 scale_rate_idx = first_idx;
489 last_idx = first_idx;
492 * Update the win for each rate. We determine which rates
493 * were Tx'd based on the total number of retries vs. the number
494 * of retries configured for each rate -- currently set to the
495 * il value 'retry_rate' vs. rate specific
497 * On exit from this while loop last_idx indicates the rate
498 * at which the frame was finally transmitted (or failed if no
501 while (retries > 1) {
502 if ((retries - 1) < il->retry_rate) {
503 current_count = (retries - 1);
504 last_idx = scale_rate_idx;
506 current_count = il->retry_rate;
507 last_idx = il3945_rs_next_rate(il, scale_rate_idx);
510 /* Update this rate accounting for as many retries
511 * as was used for it (per current_count) */
512 il3945_collect_tx_data(rs_sta, &rs_sta->win[scale_rate_idx], 0,
513 current_count, scale_rate_idx);
514 D_RATE("Update rate %d for %d retries.\n", scale_rate_idx,
517 retries -= current_count;
519 scale_rate_idx = last_idx;
522 /* Update the last idx win with success/failure based on ACK */
523 D_RATE("Update rate %d with %s.\n", last_idx,
524 (info->flags & IEEE80211_TX_STAT_ACK) ? "success" : "failure");
525 il3945_collect_tx_data(rs_sta, &rs_sta->win[last_idx],
526 info->flags & IEEE80211_TX_STAT_ACK, 1,
529 /* We updated the rate scale win -- 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 + rs_sta->flush_time)) {
537 rs_sta->last_partial_flush = jiffies;
538 rs_sta->flush_pending = 1;
539 mod_timer(&rs_sta->rate_scale_flush,
540 jiffies + rs_sta->flush_time);
543 spin_unlock_irqrestore(&rs_sta->lock, flags);
549 il3945_get_adjacent_rate(struct il3945_rs_sta *rs_sta, u8 idx, u16 rate_mask,
550 enum ieee80211_band band)
552 u8 high = RATE_INVALID;
553 u8 low = RATE_INVALID;
554 struct il_priv *il __maybe_unused = rs_sta->il;
556 /* 802.11A walks to the next literal adjacent rate in
558 if (unlikely(band == IEEE80211_BAND_5GHZ)) {
562 /* Find the previous rate that is in the rate mask */
564 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
565 if (rate_mask & mask) {
571 /* Find the next rate that is in the rate mask */
573 for (mask = (1 << i); i < RATE_COUNT_3945; i++, mask <<= 1) {
574 if (rate_mask & mask) {
580 return (high << 8) | low;
584 while (low != RATE_INVALID) {
586 low = il3945_rates[low].prev_rs_tgg;
588 low = il3945_rates[low].prev_rs;
589 if (low == RATE_INVALID)
591 if (rate_mask & (1 << low))
593 D_RATE("Skipping masked lower rate: %d\n", low);
597 while (high != RATE_INVALID) {
599 high = il3945_rates[high].next_rs_tgg;
601 high = il3945_rates[high].next_rs;
602 if (high == RATE_INVALID)
604 if (rate_mask & (1 << high))
606 D_RATE("Skipping masked higher rate: %d\n", high);
609 return (high << 8) | low;
613 * il3945_rs_get_rate - find the rate for the requested packet
615 * Returns the ieee80211_rate structure allocated by the driver.
617 * The rate control algorithm has no internal mapping between hw_mode's
618 * rate ordering and the rate ordering used by the rate control algorithm.
620 * The rate control algorithm uses a single table of rates that goes across
621 * the entire A/B/G spectrum vs. being limited to just one particular
624 * As such, we can't convert the idx obtained below into the hw_mode's
625 * rate table and must reference the driver allocated rate table
629 il3945_rs_get_rate(void *il_r, struct ieee80211_sta *sta, void *il_sta,
630 struct ieee80211_tx_rate_control *txrc)
632 struct ieee80211_supported_band *sband = txrc->sband;
633 struct sk_buff *skb = txrc->skb;
634 u8 low = RATE_INVALID;
635 u8 high = RATE_INVALID;
638 struct il3945_rs_sta *rs_sta = il_sta;
639 struct il3945_rate_scale_data *win = NULL;
640 int current_tpt = IL_INVALID_VALUE;
641 int low_tpt = IL_INVALID_VALUE;
642 int high_tpt = IL_INVALID_VALUE;
647 s8 max_rate_idx = -1;
648 struct il_priv *il __maybe_unused = (struct il_priv *)il_r;
649 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
653 /* Treat uninitialized rate scaling data same as non-existing. */
654 if (rs_sta && !rs_sta->il) {
655 D_RATE("Rate scaling information not initialized yet.\n");
659 if (rate_control_send_low(sta, il_sta, txrc))
662 rate_mask = sta->supp_rates[sband->band];
664 /* get user max rate if set */
665 max_rate_idx = txrc->max_rate_idx;
666 if (sband->band == IEEE80211_BAND_5GHZ && max_rate_idx != -1)
667 max_rate_idx += IL_FIRST_OFDM_RATE;
668 if (max_rate_idx < 0 || max_rate_idx >= RATE_COUNT)
671 idx = min(rs_sta->last_txrate_idx & 0xffff, RATE_COUNT_3945 - 1);
673 if (sband->band == IEEE80211_BAND_5GHZ)
674 rate_mask = rate_mask << IL_FIRST_OFDM_RATE;
676 spin_lock_irqsave(&rs_sta->lock, flags);
678 /* for recent assoc, choose best rate regarding
681 if (rs_sta->start_rate != RATE_INVALID) {
682 if (rs_sta->start_rate < idx &&
683 (rate_mask & (1 << rs_sta->start_rate)))
684 idx = rs_sta->start_rate;
685 rs_sta->start_rate = RATE_INVALID;
688 /* force user max rate if set by user */
689 if (max_rate_idx != -1 && max_rate_idx < idx) {
690 if (rate_mask & (1 << max_rate_idx))
694 win = &(rs_sta->win[idx]);
696 fail_count = win->counter - win->success_counter;
698 if (fail_count < RATE_MIN_FAILURE_TH &&
699 win->success_counter < RATE_MIN_SUCCESS_TH) {
700 spin_unlock_irqrestore(&rs_sta->lock, flags);
702 D_RATE("Invalid average_tpt on rate %d: "
703 "counter: %d, success_counter: %d, "
704 "expected_tpt is %sNULL\n", idx, win->counter,
705 win->success_counter,
706 rs_sta->expected_tpt ? "not " : "");
708 /* Can't calculate this yet; not enough history */
709 win->average_tpt = IL_INVALID_VALUE;
714 current_tpt = win->average_tpt;
717 il3945_get_adjacent_rate(rs_sta, idx, rate_mask, sband->band);
718 low = high_low & 0xff;
719 high = (high_low >> 8) & 0xff;
721 /* If user set max rate, dont allow higher than user constrain */
722 if (max_rate_idx != -1 && max_rate_idx < high)
725 /* Collect Measured throughputs of adjacent rates */
726 if (low != RATE_INVALID)
727 low_tpt = rs_sta->win[low].average_tpt;
729 if (high != RATE_INVALID)
730 high_tpt = rs_sta->win[high].average_tpt;
732 spin_unlock_irqrestore(&rs_sta->lock, flags);
736 /* Low success ratio , need to drop the rate */
737 if (win->success_ratio < RATE_DECREASE_TH || !current_tpt) {
738 D_RATE("decrease rate because of low success_ratio\n");
740 /* No throughput measured yet for adjacent rates,
742 } else if (low_tpt == IL_INVALID_VALUE && high_tpt == IL_INVALID_VALUE) {
744 if (high != RATE_INVALID &&
745 win->success_ratio >= RATE_INCREASE_TH)
747 else if (low != RATE_INVALID)
750 /* Both adjacent throughputs are measured, but neither one has
751 * better throughput; we're using the best rate, don't change
753 } else if (low_tpt != IL_INVALID_VALUE && high_tpt != IL_INVALID_VALUE
754 && low_tpt < current_tpt && high_tpt < current_tpt) {
756 D_RATE("No action -- low [%d] & high [%d] < "
757 "current_tpt [%d]\n", low_tpt, high_tpt, current_tpt);
760 /* At least one of the rates has better throughput */
762 if (high_tpt != IL_INVALID_VALUE) {
764 /* High rate has better throughput, Increase
766 if (high_tpt > current_tpt &&
767 win->success_ratio >= RATE_INCREASE_TH)
770 D_RATE("decrease rate because of high tpt\n");
773 } else if (low_tpt != IL_INVALID_VALUE) {
774 if (low_tpt > current_tpt) {
775 D_RATE("decrease rate because of low tpt\n");
777 } else if (win->success_ratio >= RATE_INCREASE_TH) {
778 /* Lower rate has better
779 * throughput,decrease rate */
785 /* Sanity check; asked for decrease, but success rate or throughput
786 * has been good at old rate. Don't change it. */
787 if (scale_action == -1 && low != RATE_INVALID &&
788 (win->success_ratio > RATE_HIGH_TH ||
789 current_tpt > 100 * rs_sta->expected_tpt[low]))
792 switch (scale_action) {
796 if (low != RATE_INVALID)
802 if (high != RATE_INVALID)
813 D_RATE("Selected %d (action %d) - low %d high %d\n", idx, scale_action,
818 if (sband->band == IEEE80211_BAND_5GHZ) {
819 if (WARN_ON_ONCE(idx < IL_FIRST_OFDM_RATE))
820 idx = IL_FIRST_OFDM_RATE;
821 rs_sta->last_txrate_idx = idx;
822 info->control.rates[0].idx = idx - IL_FIRST_OFDM_RATE;
824 rs_sta->last_txrate_idx = idx;
825 info->control.rates[0].idx = rs_sta->last_txrate_idx;
828 D_RATE("leave: %d\n", idx);
831 #ifdef CONFIG_MAC80211_DEBUGFS
833 il3945_open_file_generic(struct inode *inode, struct file *file)
835 file->private_data = inode->i_private;
840 il3945_sta_dbgfs_stats_table_read(struct file *file, char __user *user_buf,
841 size_t count, loff_t *ppos)
847 struct il3945_rs_sta *lq_sta = file->private_data;
849 buff = kmalloc(1024, GFP_KERNEL);
855 "tx packets=%d last rate idx=%d\n"
856 "rate=0x%X flush time %d\n", lq_sta->tx_packets,
857 lq_sta->last_txrate_idx, lq_sta->start_rate,
858 jiffies_to_msecs(lq_sta->flush_time));
859 for (j = 0; j < RATE_COUNT_3945; j++) {
861 sprintf(buff + desc, "counter=%d success=%d %%=%d\n",
862 lq_sta->win[j].counter,
863 lq_sta->win[j].success_counter,
864 lq_sta->win[j].success_ratio);
866 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
871 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
872 .read = il3945_sta_dbgfs_stats_table_read,
873 .open = il3945_open_file_generic,
874 .llseek = default_llseek,
878 il3945_add_debugfs(void *il, void *il_sta, struct dentry *dir)
880 struct il3945_rs_sta *lq_sta = il_sta;
882 lq_sta->rs_sta_dbgfs_stats_table_file =
883 debugfs_create_file("rate_stats_table", 0600, dir, lq_sta,
884 &rs_sta_dbgfs_stats_table_ops);
889 il3945_remove_debugfs(void *il, void *il_sta)
891 struct il3945_rs_sta *lq_sta = il_sta;
892 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
897 * Initialization of rate scaling information is done by driver after
898 * the station is added. Since mac80211 calls this function before a
899 * station is added we ignore it.
902 il3945_rs_rate_init_stub(void *il_r, struct ieee80211_supported_band *sband,
903 struct ieee80211_sta *sta, void *il_sta)
907 static struct rate_control_ops rs_ops = {
910 .tx_status = il3945_rs_tx_status,
911 .get_rate = il3945_rs_get_rate,
912 .rate_init = il3945_rs_rate_init_stub,
913 .alloc = il3945_rs_alloc,
914 .free = il3945_rs_free,
915 .alloc_sta = il3945_rs_alloc_sta,
916 .free_sta = il3945_rs_free_sta,
917 #ifdef CONFIG_MAC80211_DEBUGFS
918 .add_sta_debugfs = il3945_add_debugfs,
919 .remove_sta_debugfs = il3945_remove_debugfs,
925 il3945_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
927 struct il_priv *il = hw->priv;
930 struct il3945_rs_sta *rs_sta;
931 struct ieee80211_sta *sta;
932 struct il3945_sta_priv *psta;
939 ieee80211_find_sta(il->ctx.vif, il->stations[sta_id].sta.sta.addr);
941 D_RATE("Unable to find station to initialize rate scaling.\n");
946 psta = (void *)sta->drv_priv;
947 rs_sta = &psta->rs_sta;
949 spin_lock_irqsave(&rs_sta->lock, flags);
953 case IEEE80211_BAND_2GHZ:
954 /* TODO: this always does G, not a regression */
955 if (il->ctx.active.flags & RXON_FLG_TGG_PROTECT_MSK) {
957 rs_sta->expected_tpt = il3945_expected_tpt_g_prot;
959 rs_sta->expected_tpt = il3945_expected_tpt_g;
962 case IEEE80211_BAND_5GHZ:
963 rs_sta->expected_tpt = il3945_expected_tpt_a;
965 case IEEE80211_NUM_BANDS:
970 spin_unlock_irqrestore(&rs_sta->lock, flags);
972 rssi = il->_3945.last_rx_rssi;
974 rssi = IL_MIN_RSSI_VAL;
976 D_RATE("Network RSSI: %d\n", rssi);
978 rs_sta->start_rate = il3945_get_rate_idx_by_rssi(rssi, il->band);
980 D_RATE("leave: rssi %d assign rate idx: " "%d (plcp 0x%x)\n", rssi,
981 rs_sta->start_rate, il3945_rates[rs_sta->start_rate].plcp);
986 il3945_rate_control_register(void)
988 return ieee80211_rate_control_register(&rs_ops);
992 il3945_rate_control_unregister(void)
994 ieee80211_rate_control_unregister(&rs_ops);