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.h>
41 #include <linux/wireless.h>
43 #include "../net/mac80211/ieee80211_rate.h"
47 #define RS_NAME "iwl-3945-rs"
49 struct iwl_rate_scale_data {
58 struct iwl_rate_scale_priv {
61 unsigned long last_partial_flush;
62 unsigned long last_flush;
70 struct timer_list rate_scale_flush;
71 struct iwl_rate_scale_data win[IWL_RATE_COUNT];
74 static s32 iwl_expected_tpt_g[IWL_RATE_COUNT] = {
75 0, 0, 76, 104, 130, 168, 191, 202, 7, 13, 35, 58
78 static s32 iwl_expected_tpt_g_prot[IWL_RATE_COUNT] = {
79 0, 0, 0, 80, 93, 113, 123, 125, 7, 13, 35, 58
82 static s32 iwl_expected_tpt_a[IWL_RATE_COUNT] = {
83 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0, 0
86 static s32 iwl_expected_tpt_b[IWL_RATE_COUNT] = {
87 0, 0, 0, 0, 0, 0, 0, 0, 7, 13, 35, 58
90 struct iwl_tpt_entry {
95 static struct iwl_tpt_entry iwl_tpt_table_a[] = {
96 {-60, IWL_RATE_54M_INDEX},
97 {-64, IWL_RATE_48M_INDEX},
98 {-72, IWL_RATE_36M_INDEX},
99 {-80, IWL_RATE_24M_INDEX},
100 {-84, IWL_RATE_18M_INDEX},
101 {-85, IWL_RATE_12M_INDEX},
102 {-87, IWL_RATE_9M_INDEX},
103 {-89, IWL_RATE_6M_INDEX}
106 static struct iwl_tpt_entry iwl_tpt_table_b[] = {
107 {-86, IWL_RATE_11M_INDEX},
108 {-88, IWL_RATE_5M_INDEX},
109 {-90, IWL_RATE_2M_INDEX},
110 {-92, IWL_RATE_1M_INDEX}
114 static struct iwl_tpt_entry iwl_tpt_table_g[] = {
115 {-60, IWL_RATE_54M_INDEX},
116 {-64, IWL_RATE_48M_INDEX},
117 {-68, IWL_RATE_36M_INDEX},
118 {-80, IWL_RATE_24M_INDEX},
119 {-84, IWL_RATE_18M_INDEX},
120 {-85, IWL_RATE_12M_INDEX},
121 {-86, IWL_RATE_11M_INDEX},
122 {-88, IWL_RATE_5M_INDEX},
123 {-90, IWL_RATE_2M_INDEX},
124 {-92, IWL_RATE_1M_INDEX}
127 #define IWL_RATE_MAX_WINDOW 62
128 #define IWL_RATE_FLUSH (3*HZ/10)
129 #define IWL_RATE_WIN_FLUSH (HZ/2)
130 #define IWL_RATE_HIGH_TH 11520
131 #define IWL_RATE_MIN_FAILURE_TH 8
132 #define IWL_RATE_MIN_SUCCESS_TH 8
133 #define IWL_RATE_DECREASE_TH 1920
135 static u8 iwl_get_rate_index_by_rssi(s32 rssi, u8 mode)
139 struct iwl_tpt_entry *tpt_table = NULL;
141 if ((rssi < IWL_MIN_RSSI_VAL) || (rssi > IWL_MAX_RSSI_VAL))
142 rssi = IWL_MIN_RSSI_VAL;
145 case MODE_IEEE80211G:
146 tpt_table = iwl_tpt_table_g;
147 table_size = ARRAY_SIZE(iwl_tpt_table_g);
150 case MODE_IEEE80211A:
151 tpt_table = iwl_tpt_table_a;
152 table_size = ARRAY_SIZE(iwl_tpt_table_a);
156 case MODE_IEEE80211B:
157 tpt_table = iwl_tpt_table_b;
158 table_size = ARRAY_SIZE(iwl_tpt_table_b);
162 while ((index < table_size) && (rssi < tpt_table[index].min_rssi))
165 index = min(index, (table_size - 1));
167 return tpt_table[index].index;
170 static void iwl_clear_window(struct iwl_rate_scale_data *window)
173 window->success_counter = 0;
174 window->success_ratio = IWL_INVALID_VALUE;
176 window->average_tpt = IWL_INVALID_VALUE;
181 * iwl_rate_scale_flush_windows - flush out the rate scale windows
183 * Returns the number of windows that have gathered data but were
184 * not flushed. If there were any that were not flushed, then
185 * reschedule the rate flushing routine.
187 static int iwl_rate_scale_flush_windows(struct iwl_rate_scale_priv *rs_priv)
194 * For each rate, if we have collected data on that rate
195 * and it has been more than IWL_RATE_WIN_FLUSH
196 * since we flushed, clear out the gathered statistics
198 for (i = 0; i < IWL_RATE_COUNT; i++) {
199 if (!rs_priv->win[i].counter)
202 spin_lock_irqsave(&rs_priv->lock, flags);
203 if (time_after(jiffies, rs_priv->win[i].stamp +
204 IWL_RATE_WIN_FLUSH)) {
205 IWL_DEBUG_RATE("flushing %d samples of rate "
207 rs_priv->win[i].counter, i);
208 iwl_clear_window(&rs_priv->win[i]);
211 spin_unlock_irqrestore(&rs_priv->lock, flags);
217 #define IWL_RATE_FLUSH_MAX 5000 /* msec */
218 #define IWL_RATE_FLUSH_MIN 50 /* msec */
220 static void iwl_bg_rate_scale_flush(unsigned long data)
222 struct iwl_rate_scale_priv *rs_priv = (void *)data;
225 u32 packet_count, duration, pps;
227 IWL_DEBUG_RATE("enter\n");
229 unflushed = iwl_rate_scale_flush_windows(rs_priv);
231 spin_lock_irqsave(&rs_priv->lock, flags);
233 rs_priv->flush_pending = 0;
235 /* Number of packets Rx'd since last time this timer ran */
236 packet_count = (rs_priv->tx_packets - rs_priv->last_tx_packets) + 1;
238 rs_priv->last_tx_packets = rs_priv->tx_packets + 1;
242 jiffies_to_msecs(jiffies - rs_priv->last_partial_flush);
243 /* duration = jiffies_to_msecs(rs_priv->flush_time); */
245 IWL_DEBUG_RATE("Tx'd %d packets in %dms\n",
246 packet_count, duration);
248 /* Determine packets per second */
250 pps = (packet_count * 1000) / duration;
255 duration = IWL_RATE_FLUSH_MAX / pps;
256 if (duration < IWL_RATE_FLUSH_MIN)
257 duration = IWL_RATE_FLUSH_MIN;
259 duration = IWL_RATE_FLUSH_MAX;
261 rs_priv->flush_time = msecs_to_jiffies(duration);
263 IWL_DEBUG_RATE("new flush period: %d msec ave %d\n",
264 duration, packet_count);
266 mod_timer(&rs_priv->rate_scale_flush, jiffies +
267 rs_priv->flush_time);
269 rs_priv->last_partial_flush = jiffies;
272 /* If there weren't any unflushed entries, we don't schedule the timer
275 rs_priv->last_flush = jiffies;
277 spin_unlock_irqrestore(&rs_priv->lock, flags);
279 IWL_DEBUG_RATE("leave\n");
283 * iwl_collect_tx_data - Update the success/failure sliding window
285 * We keep a sliding window of the last 64 packets transmitted
286 * at this rate. window->data contains the bitmask of successful
289 static void iwl_collect_tx_data(struct iwl_rate_scale_priv *rs_priv,
290 struct iwl_rate_scale_data *window,
291 int success, int retries)
296 IWL_DEBUG_RATE("leave: retries == 0 -- should be at least 1\n");
301 spin_lock_irqsave(&rs_priv->lock, flags);
303 /* If we have filled up the window then subtract one from the
304 * success counter if the high-bit is counting toward
306 if (window->counter == IWL_RATE_MAX_WINDOW) {
307 if (window->data & (1ULL << (IWL_RATE_MAX_WINDOW - 1)))
308 window->success_counter--;
312 /* Slide the window to the left one bit */
313 window->data = (window->data << 1);
315 /* If this packet was a success then set the low bit high */
317 window->success_counter++;
321 /* window->counter can't be 0 -- it is either >0 or
322 * IWL_RATE_MAX_WINDOW */
323 window->success_ratio = 12800 * window->success_counter /
326 /* Tag this window as having been updated */
327 window->stamp = jiffies;
329 spin_unlock_irqrestore(&rs_priv->lock, flags);
333 static void rs_rate_init(void *priv_rate, void *priv_sta,
334 struct ieee80211_local *local, struct sta_info *sta)
338 IWL_DEBUG_RATE("enter\n");
340 /* TODO: what is a good starting rate for STA? About middle? Maybe not
341 * the lowest or the highest rate.. Could consider using RSSI from
342 * previous packets? Need to have IEEE 802.1X auth succeed immediately
345 for (i = IWL_RATE_COUNT - 1; i >= 0; i--) {
346 if (sta->supp_rates & (1 << i)) {
352 sta->last_txrate = sta->txrate;
354 IWL_DEBUG_RATE("leave\n");
357 static void *rs_alloc(struct ieee80211_local *local)
359 return local->hw.priv;
362 /* rate scale requires free function to be implmented */
363 static void rs_free(void *priv)
367 static void rs_clear(void *priv)
373 static void *rs_alloc_sta(void *priv, gfp_t gfp)
375 struct iwl_rate_scale_priv *rs_priv;
378 IWL_DEBUG_RATE("enter\n");
380 rs_priv = kzalloc(sizeof(struct iwl_rate_scale_priv), gfp);
382 IWL_DEBUG_RATE("leave: ENOMEM\n");
386 spin_lock_init(&rs_priv->lock);
388 rs_priv->start_rate = IWL_RATE_INVALID;
390 /* default to just 802.11b */
391 rs_priv->expected_tpt = iwl_expected_tpt_b;
393 rs_priv->last_partial_flush = jiffies;
394 rs_priv->last_flush = jiffies;
395 rs_priv->flush_time = IWL_RATE_FLUSH;
396 rs_priv->last_tx_packets = 0;
397 rs_priv->ibss_sta_added = 0;
399 init_timer(&rs_priv->rate_scale_flush);
400 rs_priv->rate_scale_flush.data = (unsigned long)rs_priv;
401 rs_priv->rate_scale_flush.function = &iwl_bg_rate_scale_flush;
403 for (i = 0; i < IWL_RATE_COUNT; i++)
404 iwl_clear_window(&rs_priv->win[i]);
406 IWL_DEBUG_RATE("leave\n");
411 static void rs_free_sta(void *priv, void *priv_sta)
413 struct iwl_rate_scale_priv *rs_priv = priv_sta;
415 IWL_DEBUG_RATE("enter\n");
416 del_timer_sync(&rs_priv->rate_scale_flush);
418 IWL_DEBUG_RATE("leave\n");
422 * rs_tx_status - Update rate control values based on Tx results
424 * NOTE: Uses iwl_priv->retry_rate for the # of retries attempted by
425 * the hardware for each rate.
427 static void rs_tx_status(void *priv_rate,
428 struct net_device *dev,
430 struct ieee80211_tx_status *tx_resp)
432 u8 retries, current_count;
433 int scale_rate_index, first_index, last_index;
435 struct sta_info *sta;
436 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
437 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
438 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
439 struct iwl_rate_scale_priv *rs_priv;
441 IWL_DEBUG_RATE("enter\n");
443 retries = tx_resp->retry_count;
445 first_index = tx_resp->control.tx_rate;
446 if ((first_index < 0) || (first_index >= IWL_RATE_COUNT)) {
447 IWL_DEBUG_RATE("leave: Rate out of bounds: %0x for %d\n",
448 tx_resp->control.tx_rate, first_index);
452 sta = sta_info_get(local, hdr->addr1);
453 if (!sta || !sta->rate_ctrl_priv) {
456 IWL_DEBUG_RATE("leave: No STA priv data to update!\n");
460 rs_priv = (void *)sta->rate_ctrl_priv;
462 rs_priv->tx_packets++;
464 scale_rate_index = first_index;
465 last_index = first_index;
468 * Update the window for each rate. We determine which rates
469 * were Tx'd based on the total number of retries vs. the number
470 * of retries configured for each rate -- currently set to the
471 * priv value 'retry_rate' vs. rate specific
473 * On exit from this while loop last_index indicates the rate
474 * at which the frame was finally transmitted (or failed if no
477 while (retries > 0) {
478 if (retries < priv->retry_rate) {
479 current_count = retries;
480 last_index = scale_rate_index;
482 current_count = priv->retry_rate;
483 last_index = iwl_get_prev_ieee_rate(scale_rate_index);
486 /* Update this rate accounting for as many retries
487 * as was used for it (per current_count) */
488 iwl_collect_tx_data(rs_priv,
489 &rs_priv->win[scale_rate_index],
491 IWL_DEBUG_RATE("Update rate %d for %d retries.\n",
492 scale_rate_index, current_count);
494 retries -= current_count;
498 iwl_get_prev_ieee_rate(scale_rate_index);
501 /* Update the last index window with success/failure based on ACK */
502 IWL_DEBUG_RATE("Update rate %d with %s.\n",
504 (tx_resp->flags & IEEE80211_TX_STATUS_ACK) ?
505 "success" : "failure");
506 iwl_collect_tx_data(rs_priv,
507 &rs_priv->win[last_index],
508 tx_resp->flags & IEEE80211_TX_STATUS_ACK, 1);
510 /* We updated the rate scale window -- if its been more than
511 * flush_time since the last run, schedule the flush
513 spin_lock_irqsave(&rs_priv->lock, flags);
515 if (!rs_priv->flush_pending &&
516 time_after(jiffies, rs_priv->last_partial_flush +
517 rs_priv->flush_time)) {
519 rs_priv->flush_pending = 1;
520 mod_timer(&rs_priv->rate_scale_flush,
521 jiffies + rs_priv->flush_time);
524 spin_unlock_irqrestore(&rs_priv->lock, flags);
528 IWL_DEBUG_RATE("leave\n");
533 static struct ieee80211_rate *iwl_get_lowest_rate(struct ieee80211_local
536 struct ieee80211_hw_mode *mode = local->oper_hw_mode;
539 for (i = 0; i < mode->num_rates; i++) {
540 struct ieee80211_rate *rate = &mode->rates[i];
542 if (rate->flags & IEEE80211_RATE_SUPPORTED)
546 return &mode->rates[0];
549 static u16 iwl_get_adjacent_rate(struct iwl_rate_scale_priv *rs_priv,
550 u8 index, u16 rate_mask, int phymode)
552 u8 high = IWL_RATE_INVALID;
553 u8 low = IWL_RATE_INVALID;
555 /* 802.11A walks to the next literal adjascent rate in
557 if (unlikely(phymode == MODE_IEEE80211A)) {
561 /* Find the previous rate that is in the rate mask */
563 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
564 if (rate_mask & mask) {
570 /* Find the next rate that is in the rate mask */
572 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
573 if (rate_mask & mask) {
579 return (high << 8) | low;
583 while (low != IWL_RATE_INVALID) {
585 low = iwl_rates[low].prev_rs_tgg;
587 low = iwl_rates[low].prev_rs;
588 if (low == IWL_RATE_INVALID)
590 if (rate_mask & (1 << low))
592 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
596 while (high != IWL_RATE_INVALID) {
598 high = iwl_rates[high].next_rs_tgg;
600 high = iwl_rates[high].next_rs;
601 if (high == IWL_RATE_INVALID)
603 if (rate_mask & (1 << high))
605 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
608 return (high << 8) | low;
612 * rs_get_rate - find the rate for the requested packet
614 * Returns the ieee80211_rate structure allocated by the driver.
616 * The rate control algorithm has no internal mapping between hw_mode's
617 * rate ordering and the rate ordering used by the rate control algorithm.
619 * The rate control algorithm uses a single table of rates that goes across
620 * the entire A/B/G spectrum vs. being limited to just one particular
623 * As such, we can't convert the index obtained below into the hw_mode's
624 * rate table and must reference the driver allocated rate table
627 static struct ieee80211_rate *rs_get_rate(void *priv_rate,
628 struct net_device *dev,
630 struct rate_control_extra *extra)
632 u8 low = IWL_RATE_INVALID;
633 u8 high = IWL_RATE_INVALID;
636 struct iwl_rate_scale_priv *rs_priv;
637 struct iwl_rate_scale_data *window = NULL;
638 int current_tpt = IWL_INVALID_VALUE;
639 int low_tpt = IWL_INVALID_VALUE;
640 int high_tpt = IWL_INVALID_VALUE;
644 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
645 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
646 struct sta_info *sta;
648 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
649 DECLARE_MAC_BUF(mac);
651 IWL_DEBUG_RATE("enter\n");
653 memset(extra, 0, sizeof(*extra));
655 fc = le16_to_cpu(hdr->frame_control);
656 if (((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA) ||
657 (is_multicast_ether_addr(hdr->addr1))) {
658 /* Send management frames and broadcast/multicast data using
660 /* TODO: this could probably be improved.. */
661 IWL_DEBUG_RATE("leave: lowest rate (not data or is "
664 return iwl_get_lowest_rate(local);
667 sta = sta_info_get(local, hdr->addr1);
668 if (!sta || !sta->rate_ctrl_priv) {
669 IWL_DEBUG_RATE("leave: No STA priv data to update!\n");
675 rate_mask = sta->supp_rates;
676 index = min(sta->txrate & 0xffff, IWL_RATE_COUNT - 1);
678 rs_priv = (void *)sta->rate_ctrl_priv;
680 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
681 !rs_priv->ibss_sta_added) {
682 u8 sta_id = iwl_hw_find_station(priv, hdr->addr1);
684 if (sta_id == IWL_INVALID_STATION) {
685 IWL_DEBUG_RATE("LQ: ADD station %s\n",
686 print_mac(mac, hdr->addr1));
687 sta_id = iwl_add_station(priv,
688 hdr->addr1, 0, CMD_ASYNC);
690 if (sta_id != IWL_INVALID_STATION)
691 rs_priv->ibss_sta_added = 1;
694 spin_lock_irqsave(&rs_priv->lock, flags);
696 if (rs_priv->start_rate != IWL_RATE_INVALID) {
697 index = rs_priv->start_rate;
698 rs_priv->start_rate = IWL_RATE_INVALID;
701 window = &(rs_priv->win[index]);
703 fail_count = window->counter - window->success_counter;
705 if (((fail_count <= IWL_RATE_MIN_FAILURE_TH) &&
706 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))) {
707 window->average_tpt = IWL_INVALID_VALUE;
708 spin_unlock_irqrestore(&rs_priv->lock, flags);
710 IWL_DEBUG_RATE("Invalid average_tpt on rate %d: "
711 "counter: %d, success_counter: %d, "
712 "expected_tpt is %sNULL\n",
715 window->success_counter,
716 rs_priv->expected_tpt ? "not " : "");
721 window->average_tpt = ((window->success_ratio *
722 rs_priv->expected_tpt[index] + 64) / 128);
723 current_tpt = window->average_tpt;
725 high_low = iwl_get_adjacent_rate(rs_priv, index, rate_mask,
726 local->hw.conf.phymode);
727 low = high_low & 0xff;
728 high = (high_low >> 8) & 0xff;
730 if (low != IWL_RATE_INVALID)
731 low_tpt = rs_priv->win[low].average_tpt;
733 if (high != IWL_RATE_INVALID)
734 high_tpt = rs_priv->win[high].average_tpt;
736 spin_unlock_irqrestore(&rs_priv->lock, flags);
740 if ((window->success_ratio < IWL_RATE_DECREASE_TH) || !current_tpt) {
741 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
743 } else if ((low_tpt == IWL_INVALID_VALUE) &&
744 (high_tpt == IWL_INVALID_VALUE))
746 else if ((low_tpt != IWL_INVALID_VALUE) &&
747 (high_tpt != IWL_INVALID_VALUE)
748 && (low_tpt < current_tpt)
749 && (high_tpt < current_tpt)) {
750 IWL_DEBUG_RATE("No action -- low [%d] & high [%d] < "
751 "current_tpt [%d]\n",
752 low_tpt, high_tpt, current_tpt);
755 if (high_tpt != IWL_INVALID_VALUE) {
756 if (high_tpt > current_tpt)
760 ("decrease rate because of high tpt\n");
763 } else if (low_tpt != IWL_INVALID_VALUE) {
764 if (low_tpt > current_tpt) {
766 ("decrease rate because of low tpt\n");
773 if ((window->success_ratio > IWL_RATE_HIGH_TH) ||
774 (current_tpt > window->average_tpt)) {
775 IWL_DEBUG_RATE("No action -- success_ratio [%d] > HIGH_TH or "
776 "current_tpt [%d] > average_tpt [%d]\n",
777 window->success_ratio,
778 current_tpt, window->average_tpt);
782 switch (scale_action) {
784 if (low != IWL_RATE_INVALID)
789 if (high != IWL_RATE_INVALID)
799 IWL_DEBUG_RATE("Selected %d (action %d) - low %d high %d\n",
800 index, scale_action, low, high);
804 sta->last_txrate = index;
805 sta->txrate = sta->last_txrate;
808 IWL_DEBUG_RATE("leave: %d\n", index);
810 return &priv->ieee_rates[index];
813 static struct rate_control_ops rs_ops = {
816 .tx_status = rs_tx_status,
817 .get_rate = rs_get_rate,
818 .rate_init = rs_rate_init,
822 .alloc_sta = rs_alloc_sta,
823 .free_sta = rs_free_sta,
826 int iwl_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
828 struct ieee80211_local *local = hw_to_local(hw);
829 struct iwl_priv *priv = hw->priv;
830 struct iwl_rate_scale_priv *rs_priv;
831 struct sta_info *sta;
834 u32 samples = 0, success = 0, good = 0;
835 unsigned long now = jiffies;
838 sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
839 if (!sta || !sta->rate_ctrl_priv) {
842 IWL_DEBUG_RATE("leave - no private rate data!\n");
844 IWL_DEBUG_RATE("leave - no station!\n");
845 return sprintf(buf, "station %d not found\n", sta_id);
848 rs_priv = (void *)sta->rate_ctrl_priv;
849 spin_lock_irqsave(&rs_priv->lock, flags);
850 i = IWL_RATE_54M_INDEX;
856 sprintf(&buf[count], " %2dMbs: ", iwl_rates[i].ieee / 2);
858 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
859 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
861 (rs_priv->win[i].data & mask) ? '1' : '0';
863 samples += rs_priv->win[i].counter;
864 good += rs_priv->win[i].success_counter;
865 success += rs_priv->win[i].success_counter * iwl_rates[i].ieee;
867 if (rs_priv->win[i].stamp) {
869 jiffies_to_msecs(now - rs_priv->win[i].stamp);
871 if (delta > max_time)
874 count += sprintf(&buf[count], "%5dms\n", delta);
878 j = iwl_get_prev_ieee_rate(i);
883 spin_unlock_irqrestore(&rs_priv->lock, flags);
886 /* Display the average rate of all samples taken.
888 * NOTE: We multiple # of samples by 2 since the IEEE measurement
889 * added from iwl_rates is actually 2X the rate */
893 "\nAverage rate is %3d.%02dMbs over last %4dms\n"
894 "%3d%% success (%d good packets over %d tries)\n",
895 success / (2 * samples), (success * 5 / samples) % 10,
896 max_time, good * 100 / samples, good, samples);
898 count += sprintf(&buf[count], "\nAverage rate: 0Mbs\n");
903 void iwl_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
905 struct iwl_priv *priv = hw->priv;
908 struct ieee80211_local *local = hw_to_local(hw);
909 struct iwl_rate_scale_priv *rs_priv;
910 struct sta_info *sta;
912 IWL_DEBUG_RATE("enter\n");
914 if (!local->rate_ctrl->ops->name ||
915 strcmp(local->rate_ctrl->ops->name, RS_NAME)) {
916 IWL_WARNING("iwl-3945-rs not selected as rate control algo!\n");
917 IWL_DEBUG_RATE("leave - mac80211 picked the wrong RC algo.\n");
921 sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
922 if (!sta || !sta->rate_ctrl_priv) {
925 IWL_DEBUG_RATE("leave - no private rate data!\n");
929 rs_priv = (void *)sta->rate_ctrl_priv;
931 spin_lock_irqsave(&rs_priv->lock, flags);
934 switch (priv->phymode) {
935 case MODE_IEEE80211G:
936 if (priv->active_rxon.flags & RXON_FLG_TGG_PROTECT_MSK) {
938 rs_priv->expected_tpt = iwl_expected_tpt_g_prot;
940 rs_priv->expected_tpt = iwl_expected_tpt_g;
943 case MODE_IEEE80211A:
944 rs_priv->expected_tpt = iwl_expected_tpt_a;
948 IWL_WARNING("Invalid phymode. Defaulting to 802.11b\n");
949 case MODE_IEEE80211B:
950 rs_priv->expected_tpt = iwl_expected_tpt_b;
955 spin_unlock_irqrestore(&rs_priv->lock, flags);
957 rssi = priv->last_rx_rssi;
959 rssi = IWL_MIN_RSSI_VAL;
961 IWL_DEBUG(IWL_DL_INFO | IWL_DL_RATE, "Network RSSI: %d\n", rssi);
963 rs_priv->start_rate = iwl_get_rate_index_by_rssi(rssi, priv->phymode);
965 IWL_DEBUG_RATE("leave: rssi %d assign rate index: "
966 "%d (plcp 0x%x)\n", rssi, rs_priv->start_rate,
967 iwl_rates[rs_priv->start_rate].plcp);
970 void iwl_rate_control_register(struct ieee80211_hw *hw)
972 ieee80211_rate_control_register(&rs_ops);
975 void iwl_rate_control_unregister(struct ieee80211_hw *hw)
977 ieee80211_rate_control_unregister(&rs_ops);