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/******************************************************************************
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* Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
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* The full GNU General Public License is included in this distribution in the
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* file called LICENSE.
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* Contact Information:
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* Intel Linux Wireless <ilw@linux.intel.com>
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* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
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*****************************************************************************/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/skbuff.h>
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#include <linux/slab.h>
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#include <linux/wireless.h>
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#include <net/mac80211.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/delay.h>
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#include <linux/workqueue.h>
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#include "iwl-commands.h"
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#define RS_NAME "iwl-3945-rs"
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static s32 iwl3945_expected_tpt_g[IWL_RATE_COUNT_3945] = {
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7, 13, 35, 58, 0, 0, 76, 104, 130, 168, 191, 202
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static s32 iwl3945_expected_tpt_g_prot[IWL_RATE_COUNT_3945] = {
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7, 13, 35, 58, 0, 0, 0, 80, 93, 113, 123, 125
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static s32 iwl3945_expected_tpt_a[IWL_RATE_COUNT_3945] = {
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0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186
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static s32 iwl3945_expected_tpt_b[IWL_RATE_COUNT_3945] = {
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7, 13, 35, 58, 0, 0, 0, 0, 0, 0, 0, 0
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struct iwl3945_tpt_entry {
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static struct iwl3945_tpt_entry iwl3945_tpt_table_a[] = {
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{-60, IWL_RATE_54M_INDEX},
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{-64, IWL_RATE_48M_INDEX},
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{-72, IWL_RATE_36M_INDEX},
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{-80, IWL_RATE_24M_INDEX},
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{-84, IWL_RATE_18M_INDEX},
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{-85, IWL_RATE_12M_INDEX},
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{-87, IWL_RATE_9M_INDEX},
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{-89, IWL_RATE_6M_INDEX}
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static struct iwl3945_tpt_entry iwl3945_tpt_table_g[] = {
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{-60, IWL_RATE_54M_INDEX},
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{-64, IWL_RATE_48M_INDEX},
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{-68, IWL_RATE_36M_INDEX},
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{-80, IWL_RATE_24M_INDEX},
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{-84, IWL_RATE_18M_INDEX},
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{-85, IWL_RATE_12M_INDEX},
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{-86, IWL_RATE_11M_INDEX},
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{-88, IWL_RATE_5M_INDEX},
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{-90, IWL_RATE_2M_INDEX},
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{-92, IWL_RATE_1M_INDEX}
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#define IWL_RATE_MAX_WINDOW 62
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#define IWL_RATE_FLUSH (3*HZ)
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#define IWL_RATE_WIN_FLUSH (HZ/2)
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#define IWL39_RATE_HIGH_TH 11520
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#define IWL_SUCCESS_UP_TH 8960
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#define IWL_SUCCESS_DOWN_TH 10880
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#define IWL_RATE_MIN_FAILURE_TH 6
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#define IWL_RATE_MIN_SUCCESS_TH 8
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#define IWL_RATE_DECREASE_TH 1920
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#define IWL_RATE_RETRY_TH 15
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static u8 iwl3945_get_rate_index_by_rssi(s32 rssi, enum ieee80211_band band)
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struct iwl3945_tpt_entry *tpt_table = NULL;
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if ((rssi < IWL_MIN_RSSI_VAL) || (rssi > IWL_MAX_RSSI_VAL))
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rssi = IWL_MIN_RSSI_VAL;
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case IEEE80211_BAND_2GHZ:
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tpt_table = iwl3945_tpt_table_g;
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table_size = ARRAY_SIZE(iwl3945_tpt_table_g);
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case IEEE80211_BAND_5GHZ:
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tpt_table = iwl3945_tpt_table_a;
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table_size = ARRAY_SIZE(iwl3945_tpt_table_a);
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while ((index < table_size) && (rssi < tpt_table[index].min_rssi))
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index = min(index, (table_size - 1));
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return tpt_table[index].index;
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static void iwl3945_clear_window(struct iwl3945_rate_scale_data *window)
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window->success_counter = 0;
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window->success_ratio = -1;
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window->average_tpt = IWL_INVALID_VALUE;
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* iwl3945_rate_scale_flush_windows - flush out the rate scale windows
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* Returns the number of windows that have gathered data but were
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* not flushed. If there were any that were not flushed, then
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* reschedule the rate flushing routine.
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static int iwl3945_rate_scale_flush_windows(struct iwl3945_rs_sta *rs_sta)
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struct iwl_priv *priv __maybe_unused = rs_sta->priv;
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* For each rate, if we have collected data on that rate
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* and it has been more than IWL_RATE_WIN_FLUSH
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* since we flushed, clear out the gathered statistics
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for (i = 0; i < IWL_RATE_COUNT_3945; i++) {
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if (!rs_sta->win[i].counter)
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spin_lock_irqsave(&rs_sta->lock, flags);
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if (time_after(jiffies, rs_sta->win[i].stamp +
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IWL_RATE_WIN_FLUSH)) {
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IWL_DEBUG_RATE(priv, "flushing %d samples of rate "
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rs_sta->win[i].counter, i);
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iwl3945_clear_window(&rs_sta->win[i]);
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spin_unlock_irqrestore(&rs_sta->lock, flags);
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#define IWL_RATE_FLUSH_MAX 5000 /* msec */
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#define IWL_RATE_FLUSH_MIN 50 /* msec */
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#define IWL_AVERAGE_PACKETS 1500
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static void iwl3945_bg_rate_scale_flush(unsigned long data)
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struct iwl3945_rs_sta *rs_sta = (void *)data;
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struct iwl_priv *priv __maybe_unused = rs_sta->priv;
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u32 packet_count, duration, pps;
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IWL_DEBUG_RATE(priv, "enter\n");
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unflushed = iwl3945_rate_scale_flush_windows(rs_sta);
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spin_lock_irqsave(&rs_sta->lock, flags);
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/* Number of packets Rx'd since last time this timer ran */
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packet_count = (rs_sta->tx_packets - rs_sta->last_tx_packets) + 1;
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rs_sta->last_tx_packets = rs_sta->tx_packets + 1;
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jiffies_to_msecs(jiffies - rs_sta->last_partial_flush);
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IWL_DEBUG_RATE(priv, "Tx'd %d packets in %dms\n",
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packet_count, duration);
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/* Determine packets per second */
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pps = (packet_count * 1000) / duration;
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duration = (IWL_AVERAGE_PACKETS * 1000) / pps;
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if (duration < IWL_RATE_FLUSH_MIN)
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duration = IWL_RATE_FLUSH_MIN;
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else if (duration > IWL_RATE_FLUSH_MAX)
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duration = IWL_RATE_FLUSH_MAX;
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duration = IWL_RATE_FLUSH_MAX;
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rs_sta->flush_time = msecs_to_jiffies(duration);
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IWL_DEBUG_RATE(priv, "new flush period: %d msec ave %d\n",
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duration, packet_count);
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mod_timer(&rs_sta->rate_scale_flush, jiffies +
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rs_sta->last_partial_flush = jiffies;
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rs_sta->flush_time = IWL_RATE_FLUSH;
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rs_sta->flush_pending = 0;
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/* If there weren't any unflushed entries, we don't schedule the timer
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rs_sta->last_flush = jiffies;
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spin_unlock_irqrestore(&rs_sta->lock, flags);
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IWL_DEBUG_RATE(priv, "leave\n");
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* iwl3945_collect_tx_data - Update the success/failure sliding window
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* We keep a sliding window of the last 64 packets transmitted
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* at this rate. window->data contains the bitmask of successful
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static void iwl3945_collect_tx_data(struct iwl3945_rs_sta *rs_sta,
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struct iwl3945_rate_scale_data *window,
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int success, int retries, int index)
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struct iwl_priv *priv __maybe_unused = rs_sta->priv;
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IWL_DEBUG_RATE(priv, "leave: retries == 0 -- should be at least 1\n");
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spin_lock_irqsave(&rs_sta->lock, flags);
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* Keep track of only the latest 62 tx frame attempts in this rate's
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* history window; anything older isn't really relevant any more.
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* If we have filled up the sliding window, drop the oldest attempt;
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* if the oldest attempt (highest bit in bitmap) shows "success",
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* subtract "1" from the success counter (this is the main reason
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* we keep these bitmaps!).
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while (retries > 0) {
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if (window->counter >= IWL_RATE_MAX_WINDOW) {
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/* remove earliest */
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window->counter = IWL_RATE_MAX_WINDOW - 1;
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if (window->data & (1ULL << (IWL_RATE_MAX_WINDOW - 1))) {
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window->data &= ~(1ULL << (IWL_RATE_MAX_WINDOW - 1));
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window->success_counter--;
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/* Increment frames-attempted counter */
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/* Shift bitmap by one frame (throw away oldest history),
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* OR in "1", and increment "success" if this
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* frame was successful. */
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window->success_counter++;
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/* Calculate current success ratio, avoid divide-by-0! */
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if (window->counter > 0)
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window->success_ratio = 128 * (100 * window->success_counter)
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window->success_ratio = IWL_INVALID_VALUE;
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fail_count = window->counter - window->success_counter;
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/* Calculate average throughput, if we have enough history. */
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if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
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(window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
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window->average_tpt = ((window->success_ratio *
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rs_sta->expected_tpt[index] + 64) / 128);
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window->average_tpt = IWL_INVALID_VALUE;
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/* Tag this window as having been updated */
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window->stamp = jiffies;
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spin_unlock_irqrestore(&rs_sta->lock, flags);
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* Called after adding a new station to initialize rate scaling
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void iwl3945_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
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struct ieee80211_hw *hw = priv->hw;
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struct ieee80211_conf *conf = &priv->hw->conf;
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struct iwl3945_sta_priv *psta;
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struct iwl3945_rs_sta *rs_sta;
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struct ieee80211_supported_band *sband;
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IWL_DEBUG_INFO(priv, "enter\n");
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if (sta_id == priv->contexts[IWL_RXON_CTX_BSS].bcast_sta_id)
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psta = (struct iwl3945_sta_priv *) sta->drv_priv;
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rs_sta = &psta->rs_sta;
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sband = hw->wiphy->bands[conf->channel->band];
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rs_sta->start_rate = IWL_RATE_INVALID;
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/* default to just 802.11b */
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rs_sta->expected_tpt = iwl3945_expected_tpt_b;
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rs_sta->last_partial_flush = jiffies;
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rs_sta->last_flush = jiffies;
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rs_sta->flush_time = IWL_RATE_FLUSH;
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rs_sta->last_tx_packets = 0;
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rs_sta->rate_scale_flush.data = (unsigned long)rs_sta;
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rs_sta->rate_scale_flush.function = iwl3945_bg_rate_scale_flush;
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for (i = 0; i < IWL_RATE_COUNT_3945; i++)
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iwl3945_clear_window(&rs_sta->win[i]);
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/* TODO: what is a good starting rate for STA? About middle? Maybe not
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* the lowest or the highest rate.. Could consider using RSSI from
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* previous packets? Need to have IEEE 802.1X auth succeed immediately
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for (i = sband->n_bitrates - 1; i >= 0; i--) {
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if (sta->supp_rates[sband->band] & (1 << i)) {
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rs_sta->last_txrate_idx = i;
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priv->_3945.sta_supp_rates = sta->supp_rates[sband->band];
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/* For 5 GHz band it start at IWL_FIRST_OFDM_RATE */
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if (sband->band == IEEE80211_BAND_5GHZ) {
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rs_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
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priv->_3945.sta_supp_rates = priv->_3945.sta_supp_rates <<
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priv->stations[sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
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IWL_DEBUG_INFO(priv, "leave\n");
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static void *iwl3945_rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
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/* rate scale requires free function to be implemented */
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static void iwl3945_rs_free(void *priv)
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static void *iwl3945_rs_alloc_sta(void *iwl_priv, struct ieee80211_sta *sta, gfp_t gfp)
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struct iwl3945_rs_sta *rs_sta;
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struct iwl3945_sta_priv *psta = (void *) sta->drv_priv;
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struct iwl_priv *priv __maybe_unused = iwl_priv;
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IWL_DEBUG_RATE(priv, "enter\n");
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rs_sta = &psta->rs_sta;
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spin_lock_init(&rs_sta->lock);
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init_timer(&rs_sta->rate_scale_flush);
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IWL_DEBUG_RATE(priv, "leave\n");
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static void iwl3945_rs_free_sta(void *iwl_priv, struct ieee80211_sta *sta,
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struct iwl3945_rs_sta *rs_sta = priv_sta;
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* Be careful not to use any members of iwl3945_rs_sta (like trying
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* to use iwl_priv to print out debugging) since it may not be fully
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* initialized at this point.
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del_timer_sync(&rs_sta->rate_scale_flush);
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* iwl3945_rs_tx_status - Update rate control values based on Tx results
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* NOTE: Uses iwl_priv->retry_rate for the # of retries attempted by
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* the hardware for each rate.
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static void iwl3945_rs_tx_status(void *priv_rate, struct ieee80211_supported_band *sband,
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struct ieee80211_sta *sta, void *priv_sta,
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s8 retries = 0, current_count;
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int scale_rate_index, first_index, last_index;
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struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
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struct iwl3945_rs_sta *rs_sta = priv_sta;
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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IWL_DEBUG_RATE(priv, "enter\n");
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retries = info->status.rates[0].count;
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/* Sanity Check for retries */
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if (retries > IWL_RATE_RETRY_TH)
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retries = IWL_RATE_RETRY_TH;
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first_index = sband->bitrates[info->status.rates[0].idx].hw_value;
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if ((first_index < 0) || (first_index >= IWL_RATE_COUNT_3945)) {
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IWL_DEBUG_RATE(priv, "leave: Rate out of bounds: %d\n", first_index);
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IWL_DEBUG_RATE(priv, "leave: No STA priv data to update!\n");
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/* Treat uninitialized rate scaling data same as non-existing. */
477
IWL_DEBUG_RATE(priv, "leave: STA priv data uninitialized!\n");
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rs_sta->tx_packets++;
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scale_rate_index = first_index;
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last_index = first_index;
488
* Update the window for each rate. We determine which rates
489
* were Tx'd based on the total number of retries vs. the number
490
* of retries configured for each rate -- currently set to the
491
* priv value 'retry_rate' vs. rate specific
493
* On exit from this while loop last_index indicates the rate
494
* at which the frame was finally transmitted (or failed if no
497
while (retries > 1) {
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if ((retries - 1) < priv->retry_rate) {
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current_count = (retries - 1);
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last_index = scale_rate_index;
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current_count = priv->retry_rate;
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last_index = iwl3945_rs_next_rate(priv,
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/* Update this rate accounting for as many retries
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* as was used for it (per current_count) */
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iwl3945_collect_tx_data(rs_sta,
510
&rs_sta->win[scale_rate_index],
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0, current_count, scale_rate_index);
512
IWL_DEBUG_RATE(priv, "Update rate %d for %d retries.\n",
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scale_rate_index, current_count);
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retries -= current_count;
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scale_rate_index = last_index;
521
/* Update the last index window with success/failure based on ACK */
522
IWL_DEBUG_RATE(priv, "Update rate %d with %s.\n",
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(info->flags & IEEE80211_TX_STAT_ACK) ?
525
"success" : "failure");
526
iwl3945_collect_tx_data(rs_sta,
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&rs_sta->win[last_index],
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info->flags & IEEE80211_TX_STAT_ACK, 1, last_index);
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/* We updated the rate scale window -- if its been more than
531
* flush_time since the last run, schedule the flush
533
spin_lock_irqsave(&rs_sta->lock, flags);
535
if (!rs_sta->flush_pending &&
536
time_after(jiffies, rs_sta->last_flush +
537
rs_sta->flush_time)) {
539
rs_sta->last_partial_flush = jiffies;
540
rs_sta->flush_pending = 1;
541
mod_timer(&rs_sta->rate_scale_flush,
542
jiffies + rs_sta->flush_time);
545
spin_unlock_irqrestore(&rs_sta->lock, flags);
547
IWL_DEBUG_RATE(priv, "leave\n");
550
static u16 iwl3945_get_adjacent_rate(struct iwl3945_rs_sta *rs_sta,
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u8 index, u16 rate_mask, enum ieee80211_band band)
553
u8 high = IWL_RATE_INVALID;
554
u8 low = IWL_RATE_INVALID;
555
struct iwl_priv *priv __maybe_unused = rs_sta->priv;
557
/* 802.11A walks to the next literal adjacent rate in
559
if (unlikely(band == IEEE80211_BAND_5GHZ)) {
563
/* Find the previous rate that is in the rate mask */
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for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
566
if (rate_mask & mask) {
572
/* Find the next rate that is in the rate mask */
574
for (mask = (1 << i); i < IWL_RATE_COUNT_3945;
576
if (rate_mask & mask) {
582
return (high << 8) | low;
586
while (low != IWL_RATE_INVALID) {
588
low = iwl3945_rates[low].prev_rs_tgg;
590
low = iwl3945_rates[low].prev_rs;
591
if (low == IWL_RATE_INVALID)
593
if (rate_mask & (1 << low))
595
IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
599
while (high != IWL_RATE_INVALID) {
601
high = iwl3945_rates[high].next_rs_tgg;
603
high = iwl3945_rates[high].next_rs;
604
if (high == IWL_RATE_INVALID)
606
if (rate_mask & (1 << high))
608
IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
611
return (high << 8) | low;
615
* iwl3945_rs_get_rate - find the rate for the requested packet
617
* Returns the ieee80211_rate structure allocated by the driver.
619
* The rate control algorithm has no internal mapping between hw_mode's
620
* rate ordering and the rate ordering used by the rate control algorithm.
622
* The rate control algorithm uses a single table of rates that goes across
623
* the entire A/B/G spectrum vs. being limited to just one particular
626
* As such, we can't convert the index obtained below into the hw_mode's
627
* rate table and must reference the driver allocated rate table
630
static void iwl3945_rs_get_rate(void *priv_r, struct ieee80211_sta *sta,
631
void *priv_sta, struct ieee80211_tx_rate_control *txrc)
633
struct ieee80211_supported_band *sband = txrc->sband;
634
struct sk_buff *skb = txrc->skb;
635
u8 low = IWL_RATE_INVALID;
636
u8 high = IWL_RATE_INVALID;
639
struct iwl3945_rs_sta *rs_sta = priv_sta;
640
struct iwl3945_rate_scale_data *window = NULL;
641
int current_tpt = IWL_INVALID_VALUE;
642
int low_tpt = IWL_INVALID_VALUE;
643
int high_tpt = IWL_INVALID_VALUE;
648
s8 max_rate_idx = -1;
649
struct iwl_priv *priv __maybe_unused = (struct iwl_priv *)priv_r;
650
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
652
IWL_DEBUG_RATE(priv, "enter\n");
654
/* Treat uninitialized rate scaling data same as non-existing. */
655
if (rs_sta && !rs_sta->priv) {
656
IWL_DEBUG_RATE(priv, "Rate scaling information not initialized yet.\n");
660
if (rate_control_send_low(sta, priv_sta, txrc))
663
rate_mask = sta->supp_rates[sband->band];
665
/* get user max rate if set */
666
max_rate_idx = txrc->max_rate_idx;
667
if ((sband->band == IEEE80211_BAND_5GHZ) && (max_rate_idx != -1))
668
max_rate_idx += IWL_FIRST_OFDM_RATE;
669
if ((max_rate_idx < 0) || (max_rate_idx >= IWL_RATE_COUNT))
672
index = min(rs_sta->last_txrate_idx & 0xffff, IWL_RATE_COUNT_3945 - 1);
674
if (sband->band == IEEE80211_BAND_5GHZ)
675
rate_mask = rate_mask << IWL_FIRST_OFDM_RATE;
677
spin_lock_irqsave(&rs_sta->lock, flags);
679
/* for recent assoc, choose best rate regarding
682
if (rs_sta->start_rate != IWL_RATE_INVALID) {
683
if (rs_sta->start_rate < index &&
684
(rate_mask & (1 << rs_sta->start_rate)))
685
index = rs_sta->start_rate;
686
rs_sta->start_rate = IWL_RATE_INVALID;
689
/* force user max rate if set by user */
690
if ((max_rate_idx != -1) && (max_rate_idx < index)) {
691
if (rate_mask & (1 << max_rate_idx))
692
index = max_rate_idx;
695
window = &(rs_sta->win[index]);
697
fail_count = window->counter - window->success_counter;
699
if (((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
700
(window->success_counter < IWL_RATE_MIN_SUCCESS_TH))) {
701
spin_unlock_irqrestore(&rs_sta->lock, flags);
703
IWL_DEBUG_RATE(priv, "Invalid average_tpt on rate %d: "
704
"counter: %d, success_counter: %d, "
705
"expected_tpt is %sNULL\n",
708
window->success_counter,
709
rs_sta->expected_tpt ? "not " : "");
711
/* Can't calculate this yet; not enough history */
712
window->average_tpt = IWL_INVALID_VALUE;
717
current_tpt = window->average_tpt;
719
high_low = iwl3945_get_adjacent_rate(rs_sta, index, rate_mask,
721
low = high_low & 0xff;
722
high = (high_low >> 8) & 0xff;
724
/* If user set max rate, dont allow higher than user constrain */
725
if ((max_rate_idx != -1) && (max_rate_idx < high))
726
high = IWL_RATE_INVALID;
728
/* Collect Measured throughputs of adjacent rates */
729
if (low != IWL_RATE_INVALID)
730
low_tpt = rs_sta->win[low].average_tpt;
732
if (high != IWL_RATE_INVALID)
733
high_tpt = rs_sta->win[high].average_tpt;
735
spin_unlock_irqrestore(&rs_sta->lock, flags);
739
/* Low success ratio , need to drop the rate */
740
if ((window->success_ratio < IWL_RATE_DECREASE_TH) || !current_tpt) {
741
IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
743
/* No throughput measured yet for adjacent rates,
745
} else if ((low_tpt == IWL_INVALID_VALUE) &&
746
(high_tpt == IWL_INVALID_VALUE)) {
748
if (high != IWL_RATE_INVALID && window->success_ratio >= IWL_RATE_INCREASE_TH)
750
else if (low != IWL_RATE_INVALID)
753
/* Both adjacent throughputs are measured, but neither one has
754
* better throughput; we're using the best rate, don't change
756
} else if ((low_tpt != IWL_INVALID_VALUE) &&
757
(high_tpt != IWL_INVALID_VALUE) &&
758
(low_tpt < current_tpt) && (high_tpt < current_tpt)) {
760
IWL_DEBUG_RATE(priv, "No action -- low [%d] & high [%d] < "
761
"current_tpt [%d]\n",
762
low_tpt, high_tpt, current_tpt);
765
/* At least one of the rates has better throughput */
767
if (high_tpt != IWL_INVALID_VALUE) {
769
/* High rate has better throughput, Increase
771
if (high_tpt > current_tpt &&
772
window->success_ratio >= IWL_RATE_INCREASE_TH)
776
"decrease rate because of high tpt\n");
779
} else if (low_tpt != IWL_INVALID_VALUE) {
780
if (low_tpt > current_tpt) {
782
"decrease rate because of low tpt\n");
784
} else if (window->success_ratio >= IWL_RATE_INCREASE_TH) {
785
/* Lower rate has better
786
* throughput,decrease rate */
792
/* Sanity check; asked for decrease, but success rate or throughput
793
* has been good at old rate. Don't change it. */
794
if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
795
((window->success_ratio > IWL_RATE_HIGH_TH) ||
796
(current_tpt > (100 * rs_sta->expected_tpt[low]))))
799
switch (scale_action) {
803
if (low != IWL_RATE_INVALID)
809
if (high != IWL_RATE_INVALID)
820
IWL_DEBUG_RATE(priv, "Selected %d (action %d) - low %d high %d\n",
821
index, scale_action, low, high);
825
rs_sta->last_txrate_idx = index;
826
if (sband->band == IEEE80211_BAND_5GHZ)
827
info->control.rates[0].idx = rs_sta->last_txrate_idx -
830
info->control.rates[0].idx = rs_sta->last_txrate_idx;
832
IWL_DEBUG_RATE(priv, "leave: %d\n", index);
835
#ifdef CONFIG_MAC80211_DEBUGFS
836
static int iwl3945_open_file_generic(struct inode *inode, struct file *file)
838
file->private_data = inode->i_private;
842
static ssize_t iwl3945_sta_dbgfs_stats_table_read(struct file *file,
843
char __user *user_buf,
844
size_t count, loff_t *ppos)
850
struct iwl3945_rs_sta *lq_sta = file->private_data;
852
buff = kmalloc(1024, GFP_KERNEL);
856
desc += sprintf(buff + desc, "tx packets=%d last rate index=%d\n"
857
"rate=0x%X flush time %d\n",
859
lq_sta->last_txrate_idx,
860
lq_sta->start_rate, jiffies_to_msecs(lq_sta->flush_time));
861
for (j = 0; j < IWL_RATE_COUNT_3945; j++) {
862
desc += sprintf(buff+desc,
863
"counter=%d success=%d %%=%d\n",
864
lq_sta->win[j].counter,
865
lq_sta->win[j].success_counter,
866
lq_sta->win[j].success_ratio);
868
ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
873
static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
874
.read = iwl3945_sta_dbgfs_stats_table_read,
875
.open = iwl3945_open_file_generic,
876
.llseek = default_llseek,
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 iwl3945_rs_rate_init_stub(void *priv_r,
903
struct ieee80211_supported_band *sband,
904
struct ieee80211_sta *sta, void *priv_sta)
908
static struct rate_control_ops rs_ops = {
911
.tx_status = iwl3945_rs_tx_status,
912
.get_rate = iwl3945_rs_get_rate,
913
.rate_init = iwl3945_rs_rate_init_stub,
914
.alloc = iwl3945_rs_alloc,
915
.free = iwl3945_rs_free,
916
.alloc_sta = iwl3945_rs_alloc_sta,
917
.free_sta = iwl3945_rs_free_sta,
918
#ifdef CONFIG_MAC80211_DEBUGFS
919
.add_sta_debugfs = iwl3945_add_debugfs,
920
.remove_sta_debugfs = iwl3945_remove_debugfs,
924
void iwl3945_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
926
struct iwl_priv *priv = hw->priv;
929
struct iwl3945_rs_sta *rs_sta;
930
struct ieee80211_sta *sta;
931
struct iwl3945_sta_priv *psta;
933
IWL_DEBUG_RATE(priv, "enter\n");
937
sta = ieee80211_find_sta(priv->contexts[IWL_RXON_CTX_BSS].vif,
938
priv->stations[sta_id].sta.sta.addr);
940
IWL_DEBUG_RATE(priv, "Unable to find station to initialize rate scaling.\n");
945
psta = (void *) sta->drv_priv;
946
rs_sta = &psta->rs_sta;
948
spin_lock_irqsave(&rs_sta->lock, flags);
951
switch (priv->band) {
952
case IEEE80211_BAND_2GHZ:
953
/* TODO: this always does G, not a regression */
954
if (priv->contexts[IWL_RXON_CTX_BSS].active.flags &
955
RXON_FLG_TGG_PROTECT_MSK) {
957
rs_sta->expected_tpt = iwl3945_expected_tpt_g_prot;
959
rs_sta->expected_tpt = iwl3945_expected_tpt_g;
962
case IEEE80211_BAND_5GHZ:
963
rs_sta->expected_tpt = iwl3945_expected_tpt_a;
965
case IEEE80211_NUM_BANDS:
970
spin_unlock_irqrestore(&rs_sta->lock, flags);
972
rssi = priv->_3945.last_rx_rssi;
974
rssi = IWL_MIN_RSSI_VAL;
976
IWL_DEBUG_RATE(priv, "Network RSSI: %d\n", rssi);
978
rs_sta->start_rate = iwl3945_get_rate_index_by_rssi(rssi, priv->band);
980
IWL_DEBUG_RATE(priv, "leave: rssi %d assign rate index: "
981
"%d (plcp 0x%x)\n", rssi, rs_sta->start_rate,
982
iwl3945_rates[rs_sta->start_rate].plcp);
986
int iwl3945_rate_control_register(void)
988
return ieee80211_rate_control_register(&rs_ops);
991
void iwl3945_rate_control_unregister(void)
993
ieee80211_rate_control_unregister(&rs_ops);