1 /******************************************************************************
3 * Copyright(c) 2005 - 2007 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 * James P. Ketrenos <ipw2100-admin@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>
32 #include <net/ieee80211.h>
34 #include <linux/netdevice.h>
35 #include <linux/etherdevice.h>
36 #include <linux/delay.h>
38 #include <linux/workqueue.h>
40 #include "../net/mac80211/ieee80211_rate.h"
44 #define RS_NAME "iwl-3945-rs"
46 struct iwl3945_rate_scale_data {
55 struct iwl3945_rs_sta {
58 unsigned long last_partial_flush;
59 unsigned long last_flush;
67 struct timer_list rate_scale_flush;
68 struct iwl3945_rate_scale_data win[IWL_RATE_COUNT];
71 static s32 iwl3945_expected_tpt_g[IWL_RATE_COUNT] = {
72 7, 13, 35, 58, 0, 0, 76, 104, 130, 168, 191, 202
75 static s32 iwl3945_expected_tpt_g_prot[IWL_RATE_COUNT] = {
76 7, 13, 35, 58, 0, 0, 0, 80, 93, 113, 123, 125
79 static s32 iwl3945_expected_tpt_a[IWL_RATE_COUNT] = {
80 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186
83 static s32 iwl3945_expected_tpt_b[IWL_RATE_COUNT] = {
84 7, 13, 35, 58, 0, 0, 0, 0, 0, 0, 0, 0
87 struct iwl3945_tpt_entry {
92 static struct iwl3945_tpt_entry iwl3945_tpt_table_a[] = {
93 {-60, IWL_RATE_54M_INDEX},
94 {-64, IWL_RATE_48M_INDEX},
95 {-72, IWL_RATE_36M_INDEX},
96 {-80, IWL_RATE_24M_INDEX},
97 {-84, IWL_RATE_18M_INDEX},
98 {-85, IWL_RATE_12M_INDEX},
99 {-87, IWL_RATE_9M_INDEX},
100 {-89, IWL_RATE_6M_INDEX}
103 static struct iwl3945_tpt_entry iwl3945_tpt_table_g[] = {
104 {-60, IWL_RATE_54M_INDEX},
105 {-64, IWL_RATE_48M_INDEX},
106 {-68, IWL_RATE_36M_INDEX},
107 {-80, IWL_RATE_24M_INDEX},
108 {-84, IWL_RATE_18M_INDEX},
109 {-85, IWL_RATE_12M_INDEX},
110 {-86, IWL_RATE_11M_INDEX},
111 {-88, IWL_RATE_5M_INDEX},
112 {-90, IWL_RATE_2M_INDEX},
113 {-92, IWL_RATE_1M_INDEX}
116 #define IWL_RATE_MAX_WINDOW 62
117 #define IWL_RATE_FLUSH (3*HZ/10)
118 #define IWL_RATE_WIN_FLUSH (HZ/2)
119 #define IWL_RATE_HIGH_TH 11520
120 #define IWL_RATE_MIN_FAILURE_TH 8
121 #define IWL_RATE_MIN_SUCCESS_TH 8
122 #define IWL_RATE_DECREASE_TH 1920
124 static u8 iwl3945_get_rate_index_by_rssi(s32 rssi, enum ieee80211_band band)
128 struct iwl3945_tpt_entry *tpt_table = NULL;
130 if ((rssi < IWL_MIN_RSSI_VAL) || (rssi > IWL_MAX_RSSI_VAL))
131 rssi = IWL_MIN_RSSI_VAL;
134 case IEEE80211_BAND_2GHZ:
135 tpt_table = iwl3945_tpt_table_g;
136 table_size = ARRAY_SIZE(iwl3945_tpt_table_g);
139 case IEEE80211_BAND_5GHZ:
140 tpt_table = iwl3945_tpt_table_a;
141 table_size = ARRAY_SIZE(iwl3945_tpt_table_a);
149 while ((index < table_size) && (rssi < tpt_table[index].min_rssi))
152 index = min(index, (table_size - 1));
154 return tpt_table[index].index;
157 static void iwl3945_clear_window(struct iwl3945_rate_scale_data *window)
160 window->success_counter = 0;
161 window->success_ratio = IWL_INVALID_VALUE;
163 window->average_tpt = IWL_INVALID_VALUE;
168 * iwl3945_rate_scale_flush_windows - flush out the rate scale windows
170 * Returns the number of windows that have gathered data but were
171 * not flushed. If there were any that were not flushed, then
172 * reschedule the rate flushing routine.
174 static int iwl3945_rate_scale_flush_windows(struct iwl3945_rs_sta *rs_sta)
181 * For each rate, if we have collected data on that rate
182 * and it has been more than IWL_RATE_WIN_FLUSH
183 * since we flushed, clear out the gathered statistics
185 for (i = 0; i < IWL_RATE_COUNT; i++) {
186 if (!rs_sta->win[i].counter)
189 spin_lock_irqsave(&rs_sta->lock, flags);
190 if (time_after(jiffies, rs_sta->win[i].stamp +
191 IWL_RATE_WIN_FLUSH)) {
192 IWL_DEBUG_RATE("flushing %d samples of rate "
194 rs_sta->win[i].counter, i);
195 iwl3945_clear_window(&rs_sta->win[i]);
198 spin_unlock_irqrestore(&rs_sta->lock, flags);
204 #define IWL_RATE_FLUSH_MAX 5000 /* msec */
205 #define IWL_RATE_FLUSH_MIN 50 /* msec */
207 static void iwl3945_bg_rate_scale_flush(unsigned long data)
209 struct iwl3945_rs_sta *rs_sta = (void *)data;
212 u32 packet_count, duration, pps;
214 IWL_DEBUG_RATE("enter\n");
216 unflushed = iwl3945_rate_scale_flush_windows(rs_sta);
218 spin_lock_irqsave(&rs_sta->lock, flags);
220 rs_sta->flush_pending = 0;
222 /* Number of packets Rx'd since last time this timer ran */
223 packet_count = (rs_sta->tx_packets - rs_sta->last_tx_packets) + 1;
225 rs_sta->last_tx_packets = rs_sta->tx_packets + 1;
229 jiffies_to_msecs(jiffies - rs_sta->last_partial_flush);
230 /* duration = jiffies_to_msecs(rs_sta->flush_time); */
232 IWL_DEBUG_RATE("Tx'd %d packets in %dms\n",
233 packet_count, duration);
235 /* Determine packets per second */
237 pps = (packet_count * 1000) / duration;
242 duration = IWL_RATE_FLUSH_MAX / pps;
243 if (duration < IWL_RATE_FLUSH_MIN)
244 duration = IWL_RATE_FLUSH_MIN;
246 duration = IWL_RATE_FLUSH_MAX;
248 rs_sta->flush_time = msecs_to_jiffies(duration);
250 IWL_DEBUG_RATE("new flush period: %d msec ave %d\n",
251 duration, packet_count);
253 mod_timer(&rs_sta->rate_scale_flush, jiffies +
256 rs_sta->last_partial_flush = jiffies;
259 /* If there weren't any unflushed entries, we don't schedule the timer
262 rs_sta->last_flush = jiffies;
264 spin_unlock_irqrestore(&rs_sta->lock, flags);
266 IWL_DEBUG_RATE("leave\n");
270 * iwl3945_collect_tx_data - Update the success/failure sliding window
272 * We keep a sliding window of the last 64 packets transmitted
273 * at this rate. window->data contains the bitmask of successful
276 static void iwl3945_collect_tx_data(struct iwl3945_rs_sta *rs_sta,
277 struct iwl3945_rate_scale_data *window,
278 int success, int retries)
283 IWL_DEBUG_RATE("leave: retries == 0 -- should be at least 1\n");
288 spin_lock_irqsave(&rs_sta->lock, flags);
290 /* If we have filled up the window then subtract one from the
291 * success counter if the high-bit is counting toward
293 if (window->counter == IWL_RATE_MAX_WINDOW) {
294 if (window->data & (1ULL << (IWL_RATE_MAX_WINDOW - 1)))
295 window->success_counter--;
299 /* Slide the window to the left one bit */
300 window->data = (window->data << 1);
302 /* If this packet was a success then set the low bit high */
304 window->success_counter++;
308 /* window->counter can't be 0 -- it is either >0 or
309 * IWL_RATE_MAX_WINDOW */
310 window->success_ratio = 12800 * window->success_counter /
313 /* Tag this window as having been updated */
314 window->stamp = jiffies;
316 spin_unlock_irqrestore(&rs_sta->lock, flags);
320 static void rs_rate_init(void *priv_rate, void *priv_sta,
321 struct ieee80211_local *local, struct sta_info *sta)
325 IWL_DEBUG_RATE("enter\n");
327 /* TODO: what is a good starting rate for STA? About middle? Maybe not
328 * the lowest or the highest rate.. Could consider using RSSI from
329 * previous packets? Need to have IEEE 802.1X auth succeed immediately
332 for (i = IWL_RATE_COUNT - 1; i >= 0; i--) {
333 if (sta->supp_rates[local->hw.conf.channel->band] & (1 << i)) {
339 sta->last_txrate_idx = sta->txrate_idx;
341 /* For 5 GHz band it start at IWL_FIRST_OFDM_RATE */
342 if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
343 sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
345 IWL_DEBUG_RATE("leave\n");
348 static void *rs_alloc(struct ieee80211_local *local)
350 return local->hw.priv;
353 /* rate scale requires free function to be implemented */
354 static void rs_free(void *priv)
358 static void rs_clear(void *priv)
364 static void *rs_alloc_sta(void *priv, gfp_t gfp)
366 struct iwl3945_rs_sta *rs_sta;
369 IWL_DEBUG_RATE("enter\n");
371 rs_sta = kzalloc(sizeof(struct iwl3945_rs_sta), gfp);
373 IWL_DEBUG_RATE("leave: ENOMEM\n");
377 spin_lock_init(&rs_sta->lock);
379 rs_sta->start_rate = IWL_RATE_INVALID;
381 /* default to just 802.11b */
382 rs_sta->expected_tpt = iwl3945_expected_tpt_b;
384 rs_sta->last_partial_flush = jiffies;
385 rs_sta->last_flush = jiffies;
386 rs_sta->flush_time = IWL_RATE_FLUSH;
387 rs_sta->last_tx_packets = 0;
388 rs_sta->ibss_sta_added = 0;
390 init_timer(&rs_sta->rate_scale_flush);
391 rs_sta->rate_scale_flush.data = (unsigned long)rs_sta;
392 rs_sta->rate_scale_flush.function = &iwl3945_bg_rate_scale_flush;
394 for (i = 0; i < IWL_RATE_COUNT; i++)
395 iwl3945_clear_window(&rs_sta->win[i]);
397 IWL_DEBUG_RATE("leave\n");
402 static void rs_free_sta(void *priv, void *priv_sta)
404 struct iwl3945_rs_sta *rs_sta = priv_sta;
406 IWL_DEBUG_RATE("enter\n");
407 del_timer_sync(&rs_sta->rate_scale_flush);
409 IWL_DEBUG_RATE("leave\n");
414 * get ieee prev rate from rate scale table.
415 * for A and B mode we need to overright prev
418 static int rs_adjust_next_rate(struct iwl3945_priv *priv, int rate)
420 int next_rate = iwl3945_get_prev_ieee_rate(rate);
422 switch (priv->band) {
423 case IEEE80211_BAND_5GHZ:
424 if (rate == IWL_RATE_12M_INDEX)
425 next_rate = IWL_RATE_9M_INDEX;
426 else if (rate == IWL_RATE_6M_INDEX)
427 next_rate = IWL_RATE_6M_INDEX;
429 /* XXX cannot be invoked in current mac80211 so not a regression
430 case MODE_IEEE80211B:
431 if (rate == IWL_RATE_11M_INDEX_TABLE)
432 next_rate = IWL_RATE_5M_INDEX_TABLE;
442 * rs_tx_status - Update rate control values based on Tx results
444 * NOTE: Uses iwl3945_priv->retry_rate for the # of retries attempted by
445 * the hardware for each rate.
447 static void rs_tx_status(void *priv_rate,
448 struct net_device *dev,
450 struct ieee80211_tx_status *tx_resp)
452 u8 retries, current_count;
453 int scale_rate_index, first_index, last_index;
455 struct sta_info *sta;
456 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
457 struct iwl3945_priv *priv = (struct iwl3945_priv *)priv_rate;
458 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
459 struct iwl3945_rs_sta *rs_sta;
460 struct ieee80211_supported_band *sband;
462 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
464 IWL_DEBUG_RATE("enter\n");
466 retries = tx_resp->retry_count;
468 first_index = &sband->bitrates[0] - tx_resp->control.tx_rate;
469 if ((first_index < 0) || (first_index >= IWL_RATE_COUNT)) {
470 IWL_DEBUG_RATE("leave: Rate out of bounds: %d\n", first_index);
474 sta = sta_info_get(local, hdr->addr1);
475 if (!sta || !sta->rate_ctrl_priv) {
478 IWL_DEBUG_RATE("leave: No STA priv data to update!\n");
482 rs_sta = (void *)sta->rate_ctrl_priv;
484 rs_sta->tx_packets++;
486 scale_rate_index = first_index;
487 last_index = first_index;
490 * Update the window for each rate. We determine which rates
491 * were Tx'd based on the total number of retries vs. the number
492 * of retries configured for each rate -- currently set to the
493 * priv value 'retry_rate' vs. rate specific
495 * On exit from this while loop last_index indicates the rate
496 * at which the frame was finally transmitted (or failed if no
499 while (retries > 0) {
500 if (retries < priv->retry_rate) {
501 current_count = retries;
502 last_index = scale_rate_index;
504 current_count = priv->retry_rate;
505 last_index = rs_adjust_next_rate(priv,
509 /* Update this rate accounting for as many retries
510 * as was used for it (per current_count) */
511 iwl3945_collect_tx_data(rs_sta,
512 &rs_sta->win[scale_rate_index],
514 IWL_DEBUG_RATE("Update rate %d for %d retries.\n",
515 scale_rate_index, current_count);
517 retries -= current_count;
521 rs_adjust_next_rate(priv, scale_rate_index);
525 /* Update the last index window with success/failure based on ACK */
526 IWL_DEBUG_RATE("Update rate %d with %s.\n",
528 (tx_resp->flags & IEEE80211_TX_STATUS_ACK) ?
529 "success" : "failure");
530 iwl3945_collect_tx_data(rs_sta,
531 &rs_sta->win[last_index],
532 tx_resp->flags & IEEE80211_TX_STATUS_ACK, 1);
534 /* We updated the rate scale window -- if its been more than
535 * flush_time since the last run, schedule the flush
537 spin_lock_irqsave(&rs_sta->lock, flags);
539 if (!rs_sta->flush_pending &&
540 time_after(jiffies, rs_sta->last_partial_flush +
541 rs_sta->flush_time)) {
543 rs_sta->flush_pending = 1;
544 mod_timer(&rs_sta->rate_scale_flush,
545 jiffies + rs_sta->flush_time);
548 spin_unlock_irqrestore(&rs_sta->lock, flags);
552 IWL_DEBUG_RATE("leave\n");
557 static u16 iwl3945_get_adjacent_rate(struct iwl3945_rs_sta *rs_sta,
558 u8 index, u16 rate_mask, enum ieee80211_band band)
560 u8 high = IWL_RATE_INVALID;
561 u8 low = IWL_RATE_INVALID;
563 /* 802.11A walks to the next literal adjacent rate in
565 if (unlikely(band == IEEE80211_BAND_5GHZ)) {
569 /* Find the previous rate that is in the rate mask */
571 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
572 if (rate_mask & mask) {
578 /* Find the next rate that is in the rate mask */
580 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
581 if (rate_mask & mask) {
587 return (high << 8) | low;
591 while (low != IWL_RATE_INVALID) {
593 low = iwl3945_rates[low].prev_rs_tgg;
595 low = iwl3945_rates[low].prev_rs;
596 if (low == IWL_RATE_INVALID)
598 if (rate_mask & (1 << low))
600 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
604 while (high != IWL_RATE_INVALID) {
606 high = iwl3945_rates[high].next_rs_tgg;
608 high = iwl3945_rates[high].next_rs;
609 if (high == IWL_RATE_INVALID)
611 if (rate_mask & (1 << high))
613 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
616 return (high << 8) | low;
620 * rs_get_rate - find the rate for the requested packet
622 * Returns the ieee80211_rate structure allocated by the driver.
624 * The rate control algorithm has no internal mapping between hw_mode's
625 * rate ordering and the rate ordering used by the rate control algorithm.
627 * The rate control algorithm uses a single table of rates that goes across
628 * the entire A/B/G spectrum vs. being limited to just one particular
631 * As such, we can't convert the index obtained below into the hw_mode's
632 * rate table and must reference the driver allocated rate table
635 static void rs_get_rate(void *priv_rate, struct net_device *dev,
636 struct ieee80211_supported_band *band,
638 struct rate_selection *sel)
640 u8 low = IWL_RATE_INVALID;
641 u8 high = IWL_RATE_INVALID;
644 struct iwl3945_rs_sta *rs_sta;
645 struct iwl3945_rate_scale_data *window = NULL;
646 int current_tpt = IWL_INVALID_VALUE;
647 int low_tpt = IWL_INVALID_VALUE;
648 int high_tpt = IWL_INVALID_VALUE;
652 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
653 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
654 struct sta_info *sta;
656 struct iwl3945_priv *priv = (struct iwl3945_priv *)priv_rate;
657 DECLARE_MAC_BUF(mac);
659 IWL_DEBUG_RATE("enter\n");
661 sta = sta_info_get(local, hdr->addr1);
663 /* Send management frames and broadcast/multicast data using lowest
665 fc = le16_to_cpu(hdr->frame_control);
666 if ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
667 is_multicast_ether_addr(hdr->addr1) ||
668 !sta || !sta->rate_ctrl_priv) {
669 IWL_DEBUG_RATE("leave: No STA priv data to update!\n");
670 sel->rate = rate_lowest(local, band, sta);
676 rate_mask = sta->supp_rates[band->band];
677 index = min(sta->last_txrate_idx & 0xffff, IWL_RATE_COUNT - 1);
679 if (priv->band == IEEE80211_BAND_5GHZ)
680 rate_mask = rate_mask << IWL_FIRST_OFDM_RATE;
682 rs_sta = (void *)sta->rate_ctrl_priv;
684 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
685 !rs_sta->ibss_sta_added) {
686 u8 sta_id = iwl3945_hw_find_station(priv, hdr->addr1);
688 if (sta_id == IWL_INVALID_STATION) {
689 IWL_DEBUG_RATE("LQ: ADD station %s\n",
690 print_mac(mac, hdr->addr1));
691 sta_id = iwl3945_add_station(priv,
692 hdr->addr1, 0, CMD_ASYNC);
694 if (sta_id != IWL_INVALID_STATION)
695 rs_sta->ibss_sta_added = 1;
698 spin_lock_irqsave(&rs_sta->lock, flags);
700 if (rs_sta->start_rate != IWL_RATE_INVALID) {
701 index = rs_sta->start_rate;
702 rs_sta->start_rate = IWL_RATE_INVALID;
705 window = &(rs_sta->win[index]);
707 fail_count = window->counter - window->success_counter;
709 if (((fail_count <= IWL_RATE_MIN_FAILURE_TH) &&
710 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))) {
711 window->average_tpt = IWL_INVALID_VALUE;
712 spin_unlock_irqrestore(&rs_sta->lock, flags);
714 IWL_DEBUG_RATE("Invalid average_tpt on rate %d: "
715 "counter: %d, success_counter: %d, "
716 "expected_tpt is %sNULL\n",
719 window->success_counter,
720 rs_sta->expected_tpt ? "not " : "");
725 window->average_tpt = ((window->success_ratio *
726 rs_sta->expected_tpt[index] + 64) / 128);
727 current_tpt = window->average_tpt;
729 high_low = iwl3945_get_adjacent_rate(rs_sta, index, rate_mask,
731 low = high_low & 0xff;
732 high = (high_low >> 8) & 0xff;
734 if (low != IWL_RATE_INVALID)
735 low_tpt = rs_sta->win[low].average_tpt;
737 if (high != IWL_RATE_INVALID)
738 high_tpt = rs_sta->win[high].average_tpt;
740 spin_unlock_irqrestore(&rs_sta->lock, flags);
744 if ((window->success_ratio < IWL_RATE_DECREASE_TH) || !current_tpt) {
745 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
747 } else if ((low_tpt == IWL_INVALID_VALUE) &&
748 (high_tpt == IWL_INVALID_VALUE))
750 else if ((low_tpt != IWL_INVALID_VALUE) &&
751 (high_tpt != IWL_INVALID_VALUE)
752 && (low_tpt < current_tpt)
753 && (high_tpt < current_tpt)) {
754 IWL_DEBUG_RATE("No action -- low [%d] & high [%d] < "
755 "current_tpt [%d]\n",
756 low_tpt, high_tpt, current_tpt);
759 if (high_tpt != IWL_INVALID_VALUE) {
760 if (high_tpt > current_tpt)
764 ("decrease rate because of high tpt\n");
767 } else if (low_tpt != IWL_INVALID_VALUE) {
768 if (low_tpt > current_tpt) {
770 ("decrease rate because of low tpt\n");
777 if ((window->success_ratio > IWL_RATE_HIGH_TH) ||
778 (current_tpt > window->average_tpt)) {
779 IWL_DEBUG_RATE("No action -- success_ratio [%d] > HIGH_TH or "
780 "current_tpt [%d] > average_tpt [%d]\n",
781 window->success_ratio,
782 current_tpt, window->average_tpt);
786 switch (scale_action) {
788 if (low != IWL_RATE_INVALID)
793 if (high != IWL_RATE_INVALID)
803 IWL_DEBUG_RATE("Selected %d (action %d) - low %d high %d\n",
804 index, scale_action, low, high);
808 sta->last_txrate_idx = index;
809 if (priv->band == IEEE80211_BAND_5GHZ)
810 sta->txrate_idx = sta->last_txrate_idx - IWL_FIRST_OFDM_RATE;
812 sta->txrate_idx = sta->last_txrate_idx;
816 IWL_DEBUG_RATE("leave: %d\n", index);
818 sel->rate = &priv->ieee_rates[index];
821 static struct rate_control_ops rs_ops = {
824 .tx_status = rs_tx_status,
825 .get_rate = rs_get_rate,
826 .rate_init = rs_rate_init,
830 .alloc_sta = rs_alloc_sta,
831 .free_sta = rs_free_sta,
834 int iwl3945_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
836 struct ieee80211_local *local = hw_to_local(hw);
837 struct iwl3945_priv *priv = hw->priv;
838 struct iwl3945_rs_sta *rs_sta;
839 struct sta_info *sta;
842 u32 samples = 0, success = 0, good = 0;
843 unsigned long now = jiffies;
846 sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
847 if (!sta || !sta->rate_ctrl_priv) {
850 IWL_DEBUG_RATE("leave - no private rate data!\n");
852 IWL_DEBUG_RATE("leave - no station!\n");
853 return sprintf(buf, "station %d not found\n", sta_id);
856 rs_sta = (void *)sta->rate_ctrl_priv;
857 spin_lock_irqsave(&rs_sta->lock, flags);
858 i = IWL_RATE_54M_INDEX;
864 sprintf(&buf[count], " %2dMbs: ", iwl3945_rates[i].ieee / 2);
866 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
867 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
869 (rs_sta->win[i].data & mask) ? '1' : '0';
871 samples += rs_sta->win[i].counter;
872 good += rs_sta->win[i].success_counter;
873 success += rs_sta->win[i].success_counter *
874 iwl3945_rates[i].ieee;
876 if (rs_sta->win[i].stamp) {
878 jiffies_to_msecs(now - rs_sta->win[i].stamp);
880 if (delta > max_time)
883 count += sprintf(&buf[count], "%5dms\n", delta);
887 j = iwl3945_get_prev_ieee_rate(i);
892 spin_unlock_irqrestore(&rs_sta->lock, flags);
895 /* Display the average rate of all samples taken.
897 * NOTE: We multiple # of samples by 2 since the IEEE measurement
898 * added from iwl3945_rates is actually 2X the rate */
902 "\nAverage rate is %3d.%02dMbs over last %4dms\n"
903 "%3d%% success (%d good packets over %d tries)\n",
904 success / (2 * samples), (success * 5 / samples) % 10,
905 max_time, good * 100 / samples, good, samples);
907 count += sprintf(&buf[count], "\nAverage rate: 0Mbs\n");
912 void iwl3945_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
914 struct iwl3945_priv *priv = hw->priv;
917 struct ieee80211_local *local = hw_to_local(hw);
918 struct iwl3945_rs_sta *rs_sta;
919 struct sta_info *sta;
921 IWL_DEBUG_RATE("enter\n");
923 if (!local->rate_ctrl->ops->name ||
924 strcmp(local->rate_ctrl->ops->name, RS_NAME)) {
925 IWL_WARNING("iwl-3945-rs not selected as rate control algo!\n");
926 IWL_DEBUG_RATE("leave - mac80211 picked the wrong RC algo.\n");
930 sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
931 if (!sta || !sta->rate_ctrl_priv) {
934 IWL_DEBUG_RATE("leave - no private rate data!\n");
938 rs_sta = (void *)sta->rate_ctrl_priv;
940 spin_lock_irqsave(&rs_sta->lock, flags);
943 switch (priv->band) {
944 case IEEE80211_BAND_2GHZ:
945 /* TODO: this always does G, not a regression */
946 if (priv->active_rxon.flags & RXON_FLG_TGG_PROTECT_MSK) {
948 rs_sta->expected_tpt = iwl3945_expected_tpt_g_prot;
950 rs_sta->expected_tpt = iwl3945_expected_tpt_g;
953 case IEEE80211_BAND_5GHZ:
954 rs_sta->expected_tpt = iwl3945_expected_tpt_a;
956 case IEEE80211_NUM_BANDS:
962 spin_unlock_irqrestore(&rs_sta->lock, flags);
964 rssi = priv->last_rx_rssi;
966 rssi = IWL_MIN_RSSI_VAL;
968 IWL_DEBUG(IWL_DL_INFO | IWL_DL_RATE, "Network RSSI: %d\n", rssi);
970 rs_sta->start_rate = iwl3945_get_rate_index_by_rssi(rssi, priv->band);
972 IWL_DEBUG_RATE("leave: rssi %d assign rate index: "
973 "%d (plcp 0x%x)\n", rssi, rs_sta->start_rate,
974 iwl3945_rates[rs_sta->start_rate].plcp);
977 void iwl3945_rate_control_register(struct ieee80211_hw *hw)
979 ieee80211_rate_control_register(&rs_ops);
982 void iwl3945_rate_control_unregister(struct ieee80211_hw *hw)
984 ieee80211_rate_control_unregister(&rs_ops);