mirror of https://gitee.com/openkylin/linux.git
990 lines
25 KiB
C
990 lines
25 KiB
C
/******************************************************************************
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*
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* Copyright(c) 2005 - 2008 Intel Corporation. All rights reserved.
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*
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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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*
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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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* more details.
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*
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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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*
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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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*
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* Contact Information:
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* James P. Ketrenos <ipw2100-admin@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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*****************************************************************************/
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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/wireless.h>
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#include <net/mac80211.h>
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#include <net/ieee80211.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 "../net/mac80211/ieee80211_rate.h"
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#include "iwl-3945.h"
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#define RS_NAME "iwl-3945-rs"
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struct iwl3945_rate_scale_data {
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u64 data;
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s32 success_counter;
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s32 success_ratio;
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s32 counter;
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s32 average_tpt;
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unsigned long stamp;
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};
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struct iwl3945_rs_sta {
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spinlock_t lock;
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s32 *expected_tpt;
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unsigned long last_partial_flush;
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unsigned long last_flush;
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u32 flush_time;
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u32 last_tx_packets;
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u32 tx_packets;
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u8 tgg;
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u8 flush_pending;
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u8 start_rate;
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u8 ibss_sta_added;
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struct timer_list rate_scale_flush;
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struct iwl3945_rate_scale_data win[IWL_RATE_COUNT];
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};
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static s32 iwl3945_expected_tpt_g[IWL_RATE_COUNT] = {
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7, 13, 35, 58, 0, 0, 76, 104, 130, 168, 191, 202
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};
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static s32 iwl3945_expected_tpt_g_prot[IWL_RATE_COUNT] = {
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7, 13, 35, 58, 0, 0, 0, 80, 93, 113, 123, 125
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};
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static s32 iwl3945_expected_tpt_a[IWL_RATE_COUNT] = {
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0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186
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};
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static s32 iwl3945_expected_tpt_b[IWL_RATE_COUNT] = {
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7, 13, 35, 58, 0, 0, 0, 0, 0, 0, 0, 0
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};
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struct iwl3945_tpt_entry {
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s8 min_rssi;
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u8 index;
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};
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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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};
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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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};
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#define IWL_RATE_MAX_WINDOW 62
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#define IWL_RATE_FLUSH (3*HZ/10)
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#define IWL_RATE_WIN_FLUSH (HZ/2)
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#define IWL_RATE_HIGH_TH 11520
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#define IWL_RATE_MIN_FAILURE_TH 8
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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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static u8 iwl3945_get_rate_index_by_rssi(s32 rssi, enum ieee80211_band band)
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{
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u32 index = 0;
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u32 table_size = 0;
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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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switch (band) {
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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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break;
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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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break;
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default:
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BUG();
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break;
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}
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while ((index < table_size) && (rssi < tpt_table[index].min_rssi))
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index++;
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index = min(index, (table_size - 1));
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return tpt_table[index].index;
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}
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static void iwl3945_clear_window(struct iwl3945_rate_scale_data *window)
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{
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window->data = 0;
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window->success_counter = 0;
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window->success_ratio = -1;
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window->counter = 0;
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window->average_tpt = IWL_INV_TPT;
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window->stamp = 0;
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}
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/**
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* iwl3945_rate_scale_flush_windows - flush out the rate scale windows
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*
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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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*/
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static int iwl3945_rate_scale_flush_windows(struct iwl3945_rs_sta *rs_sta)
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{
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int unflushed = 0;
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int i;
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unsigned long flags;
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/*
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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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*/
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for (i = 0; i < IWL_RATE_COUNT; i++) {
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if (!rs_sta->win[i].counter)
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continue;
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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("flushing %d samples of rate "
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"index %d\n",
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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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} else
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unflushed++;
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spin_unlock_irqrestore(&rs_sta->lock, flags);
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}
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return unflushed;
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}
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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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static void iwl3945_bg_rate_scale_flush(unsigned long data)
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{
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struct iwl3945_rs_sta *rs_sta = (void *)data;
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int unflushed = 0;
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unsigned long flags;
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u32 packet_count, duration, pps;
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IWL_DEBUG_RATE("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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rs_sta->flush_pending = 0;
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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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if (unflushed) {
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duration =
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jiffies_to_msecs(jiffies - rs_sta->last_partial_flush);
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/* duration = jiffies_to_msecs(rs_sta->flush_time); */
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IWL_DEBUG_RATE("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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if (duration)
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pps = (packet_count * 1000) / duration;
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else
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pps = 0;
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if (pps) {
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duration = IWL_RATE_FLUSH_MAX / 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
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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("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->flush_time);
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rs_sta->last_partial_flush = jiffies;
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}
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/* If there weren't any unflushed entries, we don't schedule the timer
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* to run again */
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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("leave\n");
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}
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/**
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* iwl3945_collect_tx_data - Update the success/failure sliding window
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*
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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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* packets.
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*/
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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)
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{
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unsigned long flags;
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if (!retries) {
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IWL_DEBUG_RATE("leave: retries == 0 -- should be at least 1\n");
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return;
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}
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while (retries--) {
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spin_lock_irqsave(&rs_sta->lock, flags);
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/* If we have filled up the window then subtract one from the
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* success counter if the high-bit is counting toward
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* success */
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if (window->counter == IWL_RATE_MAX_WINDOW) {
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if (window->data & (1ULL << (IWL_RATE_MAX_WINDOW - 1)))
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window->success_counter--;
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} else
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window->counter++;
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/* Slide the window to the left one bit */
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window->data = (window->data << 1);
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/* If this packet was a success then set the low bit high */
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if (success) {
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window->success_counter++;
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window->data |= 1;
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}
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/* window->counter can't be 0 -- it is either >0 or
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* IWL_RATE_MAX_WINDOW */
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window->success_ratio = 12800 * window->success_counter /
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window->counter;
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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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}
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}
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static void rs_rate_init(void *priv_rate, void *priv_sta,
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struct ieee80211_local *local, struct sta_info *sta)
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{
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int i;
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IWL_DEBUG_RATE("enter\n");
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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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* after assoc.. */
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for (i = IWL_RATE_COUNT - 1; i >= 0; i--) {
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if (sta->supp_rates[local->hw.conf.channel->band] & (1 << i)) {
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sta->txrate_idx = i;
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break;
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}
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}
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sta->last_txrate_idx = sta->txrate_idx;
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/* For 5 GHz band it start at IWL_FIRST_OFDM_RATE */
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if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
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sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
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IWL_DEBUG_RATE("leave\n");
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}
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static void *rs_alloc(struct ieee80211_local *local)
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{
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return local->hw.priv;
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}
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/* rate scale requires free function to be implemented */
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static void rs_free(void *priv)
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{
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return;
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}
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static void rs_clear(void *priv)
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{
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return;
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}
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static void *rs_alloc_sta(void *priv, gfp_t gfp)
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{
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struct iwl3945_rs_sta *rs_sta;
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int i;
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IWL_DEBUG_RATE("enter\n");
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rs_sta = kzalloc(sizeof(struct iwl3945_rs_sta), gfp);
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if (!rs_sta) {
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IWL_DEBUG_RATE("leave: ENOMEM\n");
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return NULL;
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}
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spin_lock_init(&rs_sta->lock);
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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->ibss_sta_added = 0;
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init_timer(&rs_sta->rate_scale_flush);
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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; i++)
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iwl3945_clear_window(&rs_sta->win[i]);
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IWL_DEBUG_RATE("leave\n");
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return rs_sta;
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}
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static void rs_free_sta(void *priv, void *priv_sta)
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{
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struct iwl3945_rs_sta *rs_sta = priv_sta;
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IWL_DEBUG_RATE("enter\n");
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del_timer_sync(&rs_sta->rate_scale_flush);
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kfree(rs_sta);
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IWL_DEBUG_RATE("leave\n");
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}
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/*
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* get ieee prev rate from rate scale table.
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* for A and B mode we need to overright prev
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* value
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*/
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static int rs_adjust_next_rate(struct iwl3945_priv *priv, int rate)
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{
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int next_rate = iwl3945_get_prev_ieee_rate(rate);
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switch (priv->band) {
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case IEEE80211_BAND_5GHZ:
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if (rate == IWL_RATE_12M_INDEX)
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next_rate = IWL_RATE_9M_INDEX;
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else if (rate == IWL_RATE_6M_INDEX)
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next_rate = IWL_RATE_6M_INDEX;
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break;
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/* XXX cannot be invoked in current mac80211 so not a regression
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case MODE_IEEE80211B:
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if (rate == IWL_RATE_11M_INDEX_TABLE)
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next_rate = IWL_RATE_5M_INDEX_TABLE;
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break;
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*/
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default:
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break;
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}
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return next_rate;
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}
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/**
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* rs_tx_status - Update rate control values based on Tx results
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*
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* NOTE: Uses iwl3945_priv->retry_rate for the # of retries attempted by
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* the hardware for each rate.
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*/
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static void rs_tx_status(void *priv_rate,
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struct net_device *dev,
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struct sk_buff *skb,
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struct ieee80211_tx_status *tx_resp)
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{
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u8 retries, current_count;
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int scale_rate_index, first_index, last_index;
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unsigned long flags;
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struct sta_info *sta;
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
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struct iwl3945_priv *priv = (struct iwl3945_priv *)priv_rate;
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struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
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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_RATE("enter\n");
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sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
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retries = tx_resp->retry_count;
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first_index = tx_resp->control.tx_rate->hw_value;
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if ((first_index < 0) || (first_index >= IWL_RATE_COUNT)) {
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IWL_DEBUG_RATE("leave: Rate out of bounds: %d\n", first_index);
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return;
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}
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rcu_read_lock();
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sta = sta_info_get(local, hdr->addr1);
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if (!sta || !sta->rate_ctrl_priv) {
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rcu_read_unlock();
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IWL_DEBUG_RATE("leave: No STA priv data to update!\n");
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return;
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}
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rs_sta = (void *)sta->rate_ctrl_priv;
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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;
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/*
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* Update the window for each rate. We determine which rates
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* were Tx'd based on the total number of retries vs. the number
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* of retries configured for each rate -- currently set to the
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* priv value 'retry_rate' vs. rate specific
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*
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* On exit from this while loop last_index indicates the rate
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* at which the frame was finally transmitted (or failed if no
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* ACK)
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*/
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while (retries > 0) {
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if (retries < priv->retry_rate) {
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current_count = retries;
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last_index = scale_rate_index;
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} else {
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current_count = priv->retry_rate;
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last_index = rs_adjust_next_rate(priv,
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scale_rate_index);
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}
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/* Update this rate accounting for as many retries
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* as was used for it (per current_count) */
|
|
iwl3945_collect_tx_data(rs_sta,
|
|
&rs_sta->win[scale_rate_index],
|
|
0, current_count);
|
|
IWL_DEBUG_RATE("Update rate %d for %d retries.\n",
|
|
scale_rate_index, current_count);
|
|
|
|
retries -= current_count;
|
|
|
|
if (retries)
|
|
scale_rate_index =
|
|
rs_adjust_next_rate(priv, scale_rate_index);
|
|
}
|
|
|
|
|
|
/* Update the last index window with success/failure based on ACK */
|
|
IWL_DEBUG_RATE("Update rate %d with %s.\n",
|
|
last_index,
|
|
(tx_resp->flags & IEEE80211_TX_STATUS_ACK) ?
|
|
"success" : "failure");
|
|
iwl3945_collect_tx_data(rs_sta,
|
|
&rs_sta->win[last_index],
|
|
tx_resp->flags & IEEE80211_TX_STATUS_ACK, 1);
|
|
|
|
/* We updated the rate scale window -- if its been more than
|
|
* flush_time since the last run, schedule the flush
|
|
* again */
|
|
spin_lock_irqsave(&rs_sta->lock, flags);
|
|
|
|
if (!rs_sta->flush_pending &&
|
|
time_after(jiffies, rs_sta->last_partial_flush +
|
|
rs_sta->flush_time)) {
|
|
|
|
rs_sta->flush_pending = 1;
|
|
mod_timer(&rs_sta->rate_scale_flush,
|
|
jiffies + rs_sta->flush_time);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&rs_sta->lock, flags);
|
|
|
|
rcu_read_unlock();
|
|
|
|
IWL_DEBUG_RATE("leave\n");
|
|
|
|
return;
|
|
}
|
|
|
|
static u16 iwl3945_get_adjacent_rate(struct iwl3945_rs_sta *rs_sta,
|
|
u8 index, u16 rate_mask, enum ieee80211_band band)
|
|
{
|
|
u8 high = IWL_RATE_INVALID;
|
|
u8 low = IWL_RATE_INVALID;
|
|
|
|
/* 802.11A walks to the next literal adjacent rate in
|
|
* the rate table */
|
|
if (unlikely(band == IEEE80211_BAND_5GHZ)) {
|
|
int i;
|
|
u32 mask;
|
|
|
|
/* Find the previous rate that is in the rate mask */
|
|
i = index - 1;
|
|
for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
|
|
if (rate_mask & mask) {
|
|
low = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Find the next rate that is in the rate mask */
|
|
i = index + 1;
|
|
for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
|
|
if (rate_mask & mask) {
|
|
high = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return (high << 8) | low;
|
|
}
|
|
|
|
low = index;
|
|
while (low != IWL_RATE_INVALID) {
|
|
if (rs_sta->tgg)
|
|
low = iwl3945_rates[low].prev_rs_tgg;
|
|
else
|
|
low = iwl3945_rates[low].prev_rs;
|
|
if (low == IWL_RATE_INVALID)
|
|
break;
|
|
if (rate_mask & (1 << low))
|
|
break;
|
|
IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
|
|
}
|
|
|
|
high = index;
|
|
while (high != IWL_RATE_INVALID) {
|
|
if (rs_sta->tgg)
|
|
high = iwl3945_rates[high].next_rs_tgg;
|
|
else
|
|
high = iwl3945_rates[high].next_rs;
|
|
if (high == IWL_RATE_INVALID)
|
|
break;
|
|
if (rate_mask & (1 << high))
|
|
break;
|
|
IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
|
|
}
|
|
|
|
return (high << 8) | low;
|
|
}
|
|
|
|
/**
|
|
* rs_get_rate - find the rate for the requested packet
|
|
*
|
|
* Returns the ieee80211_rate structure allocated by the driver.
|
|
*
|
|
* The rate control algorithm has no internal mapping between hw_mode's
|
|
* rate ordering and the rate ordering used by the rate control algorithm.
|
|
*
|
|
* The rate control algorithm uses a single table of rates that goes across
|
|
* the entire A/B/G spectrum vs. being limited to just one particular
|
|
* hw_mode.
|
|
*
|
|
* As such, we can't convert the index obtained below into the hw_mode's
|
|
* rate table and must reference the driver allocated rate table
|
|
*
|
|
*/
|
|
static void rs_get_rate(void *priv_rate, struct net_device *dev,
|
|
struct ieee80211_supported_band *sband,
|
|
struct sk_buff *skb,
|
|
struct rate_selection *sel)
|
|
{
|
|
u8 low = IWL_RATE_INVALID;
|
|
u8 high = IWL_RATE_INVALID;
|
|
u16 high_low;
|
|
int index;
|
|
struct iwl3945_rs_sta *rs_sta;
|
|
struct iwl3945_rate_scale_data *window = NULL;
|
|
int current_tpt = IWL_INV_TPT;
|
|
int low_tpt = IWL_INV_TPT;
|
|
int high_tpt = IWL_INV_TPT;
|
|
u32 fail_count;
|
|
s8 scale_action = 0;
|
|
unsigned long flags;
|
|
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
|
|
struct sta_info *sta;
|
|
u16 fc, rate_mask;
|
|
struct iwl3945_priv *priv = (struct iwl3945_priv *)priv_rate;
|
|
DECLARE_MAC_BUF(mac);
|
|
|
|
IWL_DEBUG_RATE("enter\n");
|
|
|
|
rcu_read_lock();
|
|
|
|
sta = sta_info_get(local, hdr->addr1);
|
|
|
|
/* Send management frames and broadcast/multicast data using lowest
|
|
* rate. */
|
|
fc = le16_to_cpu(hdr->frame_control);
|
|
if ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
|
|
is_multicast_ether_addr(hdr->addr1) ||
|
|
!sta || !sta->rate_ctrl_priv) {
|
|
IWL_DEBUG_RATE("leave: No STA priv data to update!\n");
|
|
sel->rate = rate_lowest(local, sband, sta);
|
|
rcu_read_unlock();
|
|
return;
|
|
}
|
|
|
|
rate_mask = sta->supp_rates[sband->band];
|
|
index = min(sta->last_txrate_idx & 0xffff, IWL_RATE_COUNT - 1);
|
|
|
|
if (sband->band == IEEE80211_BAND_5GHZ)
|
|
rate_mask = rate_mask << IWL_FIRST_OFDM_RATE;
|
|
|
|
rs_sta = (void *)sta->rate_ctrl_priv;
|
|
|
|
if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
|
|
!rs_sta->ibss_sta_added) {
|
|
u8 sta_id = iwl3945_hw_find_station(priv, hdr->addr1);
|
|
|
|
if (sta_id == IWL_INVALID_STATION) {
|
|
IWL_DEBUG_RATE("LQ: ADD station %s\n",
|
|
print_mac(mac, hdr->addr1));
|
|
sta_id = iwl3945_add_station(priv,
|
|
hdr->addr1, 0, CMD_ASYNC);
|
|
}
|
|
if (sta_id != IWL_INVALID_STATION)
|
|
rs_sta->ibss_sta_added = 1;
|
|
}
|
|
|
|
spin_lock_irqsave(&rs_sta->lock, flags);
|
|
|
|
if (rs_sta->start_rate != IWL_RATE_INVALID) {
|
|
index = rs_sta->start_rate;
|
|
rs_sta->start_rate = IWL_RATE_INVALID;
|
|
}
|
|
|
|
window = &(rs_sta->win[index]);
|
|
|
|
fail_count = window->counter - window->success_counter;
|
|
|
|
if (((fail_count <= IWL_RATE_MIN_FAILURE_TH) &&
|
|
(window->success_counter < IWL_RATE_MIN_SUCCESS_TH))) {
|
|
window->average_tpt = IWL_INV_TPT;
|
|
spin_unlock_irqrestore(&rs_sta->lock, flags);
|
|
|
|
IWL_DEBUG_RATE("Invalid average_tpt on rate %d: "
|
|
"counter: %d, success_counter: %d, "
|
|
"expected_tpt is %sNULL\n",
|
|
index,
|
|
window->counter,
|
|
window->success_counter,
|
|
rs_sta->expected_tpt ? "not " : "");
|
|
goto out;
|
|
|
|
}
|
|
|
|
window->average_tpt = ((window->success_ratio *
|
|
rs_sta->expected_tpt[index] + 64) / 128);
|
|
current_tpt = window->average_tpt;
|
|
|
|
high_low = iwl3945_get_adjacent_rate(rs_sta, index, rate_mask,
|
|
sband->band);
|
|
low = high_low & 0xff;
|
|
high = (high_low >> 8) & 0xff;
|
|
|
|
if (low != IWL_RATE_INVALID)
|
|
low_tpt = rs_sta->win[low].average_tpt;
|
|
|
|
if (high != IWL_RATE_INVALID)
|
|
high_tpt = rs_sta->win[high].average_tpt;
|
|
|
|
spin_unlock_irqrestore(&rs_sta->lock, flags);
|
|
|
|
scale_action = 1;
|
|
|
|
if ((window->success_ratio < IWL_RATE_DECREASE_TH) || !current_tpt) {
|
|
IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
|
|
scale_action = -1;
|
|
} else if ((low_tpt == IWL_INV_TPT) && (high_tpt == IWL_INV_TPT))
|
|
scale_action = 1;
|
|
else if ((low_tpt != IWL_INV_TPT) && (high_tpt != IWL_INV_TPT) &&
|
|
(low_tpt < current_tpt) && (high_tpt < current_tpt)) {
|
|
IWL_DEBUG_RATE("No action -- low [%d] & high [%d] < "
|
|
"current_tpt [%d]\n",
|
|
low_tpt, high_tpt, current_tpt);
|
|
scale_action = 0;
|
|
} else {
|
|
if (high_tpt != IWL_INV_TPT) {
|
|
if (high_tpt > current_tpt)
|
|
scale_action = 1;
|
|
else {
|
|
IWL_DEBUG_RATE
|
|
("decrease rate because of high tpt\n");
|
|
scale_action = -1;
|
|
}
|
|
} else if (low_tpt != IWL_INV_TPT) {
|
|
if (low_tpt > current_tpt) {
|
|
IWL_DEBUG_RATE
|
|
("decrease rate because of low tpt\n");
|
|
scale_action = -1;
|
|
} else
|
|
scale_action = 1;
|
|
}
|
|
}
|
|
|
|
if ((window->success_ratio > IWL_RATE_HIGH_TH) ||
|
|
(current_tpt > window->average_tpt)) {
|
|
IWL_DEBUG_RATE("No action -- success_ratio [%d] > HIGH_TH or "
|
|
"current_tpt [%d] > average_tpt [%d]\n",
|
|
window->success_ratio,
|
|
current_tpt, window->average_tpt);
|
|
scale_action = 0;
|
|
}
|
|
|
|
switch (scale_action) {
|
|
case -1:
|
|
if (low != IWL_RATE_INVALID)
|
|
index = low;
|
|
break;
|
|
|
|
case 1:
|
|
if (high != IWL_RATE_INVALID)
|
|
index = high;
|
|
|
|
break;
|
|
|
|
case 0:
|
|
default:
|
|
break;
|
|
}
|
|
|
|
IWL_DEBUG_RATE("Selected %d (action %d) - low %d high %d\n",
|
|
index, scale_action, low, high);
|
|
|
|
out:
|
|
|
|
sta->last_txrate_idx = index;
|
|
if (sband->band == IEEE80211_BAND_5GHZ)
|
|
sta->txrate_idx = sta->last_txrate_idx - IWL_FIRST_OFDM_RATE;
|
|
else
|
|
sta->txrate_idx = sta->last_txrate_idx;
|
|
|
|
rcu_read_unlock();
|
|
|
|
IWL_DEBUG_RATE("leave: %d\n", index);
|
|
|
|
sel->rate = &sband->bitrates[sta->txrate_idx];
|
|
}
|
|
|
|
static struct rate_control_ops rs_ops = {
|
|
.module = NULL,
|
|
.name = RS_NAME,
|
|
.tx_status = rs_tx_status,
|
|
.get_rate = rs_get_rate,
|
|
.rate_init = rs_rate_init,
|
|
.clear = rs_clear,
|
|
.alloc = rs_alloc,
|
|
.free = rs_free,
|
|
.alloc_sta = rs_alloc_sta,
|
|
.free_sta = rs_free_sta,
|
|
};
|
|
|
|
int iwl3945_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
|
|
{
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
|
struct iwl3945_priv *priv = hw->priv;
|
|
struct iwl3945_rs_sta *rs_sta;
|
|
struct sta_info *sta;
|
|
unsigned long flags;
|
|
int count = 0, i;
|
|
u32 samples = 0, success = 0, good = 0;
|
|
unsigned long now = jiffies;
|
|
u32 max_time = 0;
|
|
|
|
rcu_read_lock();
|
|
|
|
sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
|
|
if (!sta || !sta->rate_ctrl_priv) {
|
|
if (sta)
|
|
IWL_DEBUG_RATE("leave - no private rate data!\n");
|
|
else
|
|
IWL_DEBUG_RATE("leave - no station!\n");
|
|
rcu_read_unlock();
|
|
return sprintf(buf, "station %d not found\n", sta_id);
|
|
}
|
|
|
|
rs_sta = (void *)sta->rate_ctrl_priv;
|
|
spin_lock_irqsave(&rs_sta->lock, flags);
|
|
i = IWL_RATE_54M_INDEX;
|
|
while (1) {
|
|
u64 mask;
|
|
int j;
|
|
|
|
count +=
|
|
sprintf(&buf[count], " %2dMbs: ", iwl3945_rates[i].ieee / 2);
|
|
|
|
mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
|
|
for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
|
|
buf[count++] =
|
|
(rs_sta->win[i].data & mask) ? '1' : '0';
|
|
|
|
samples += rs_sta->win[i].counter;
|
|
good += rs_sta->win[i].success_counter;
|
|
success += rs_sta->win[i].success_counter *
|
|
iwl3945_rates[i].ieee;
|
|
|
|
if (rs_sta->win[i].stamp) {
|
|
int delta =
|
|
jiffies_to_msecs(now - rs_sta->win[i].stamp);
|
|
|
|
if (delta > max_time)
|
|
max_time = delta;
|
|
|
|
count += sprintf(&buf[count], "%5dms\n", delta);
|
|
} else
|
|
buf[count++] = '\n';
|
|
|
|
j = iwl3945_get_prev_ieee_rate(i);
|
|
if (j == i)
|
|
break;
|
|
i = j;
|
|
}
|
|
spin_unlock_irqrestore(&rs_sta->lock, flags);
|
|
rcu_read_unlock();
|
|
|
|
/* Display the average rate of all samples taken.
|
|
*
|
|
* NOTE: We multiple # of samples by 2 since the IEEE measurement
|
|
* added from iwl3945_rates is actually 2X the rate */
|
|
if (samples)
|
|
count += sprintf(
|
|
&buf[count],
|
|
"\nAverage rate is %3d.%02dMbs over last %4dms\n"
|
|
"%3d%% success (%d good packets over %d tries)\n",
|
|
success / (2 * samples), (success * 5 / samples) % 10,
|
|
max_time, good * 100 / samples, good, samples);
|
|
else
|
|
count += sprintf(&buf[count], "\nAverage rate: 0Mbs\n");
|
|
|
|
return count;
|
|
}
|
|
|
|
void iwl3945_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
|
|
{
|
|
struct iwl3945_priv *priv = hw->priv;
|
|
s32 rssi = 0;
|
|
unsigned long flags;
|
|
struct ieee80211_local *local = hw_to_local(hw);
|
|
struct iwl3945_rs_sta *rs_sta;
|
|
struct sta_info *sta;
|
|
|
|
IWL_DEBUG_RATE("enter\n");
|
|
|
|
if (!local->rate_ctrl->ops->name ||
|
|
strcmp(local->rate_ctrl->ops->name, RS_NAME)) {
|
|
IWL_WARNING("iwl-3945-rs not selected as rate control algo!\n");
|
|
IWL_DEBUG_RATE("leave - mac80211 picked the wrong RC algo.\n");
|
|
return;
|
|
}
|
|
|
|
rcu_read_lock();
|
|
|
|
sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
|
|
if (!sta || !sta->rate_ctrl_priv) {
|
|
IWL_DEBUG_RATE("leave - no private rate data!\n");
|
|
rcu_read_unlock();
|
|
return;
|
|
}
|
|
|
|
rs_sta = (void *)sta->rate_ctrl_priv;
|
|
|
|
spin_lock_irqsave(&rs_sta->lock, flags);
|
|
|
|
rs_sta->tgg = 0;
|
|
switch (priv->band) {
|
|
case IEEE80211_BAND_2GHZ:
|
|
/* TODO: this always does G, not a regression */
|
|
if (priv->active_rxon.flags & RXON_FLG_TGG_PROTECT_MSK) {
|
|
rs_sta->tgg = 1;
|
|
rs_sta->expected_tpt = iwl3945_expected_tpt_g_prot;
|
|
} else
|
|
rs_sta->expected_tpt = iwl3945_expected_tpt_g;
|
|
break;
|
|
|
|
case IEEE80211_BAND_5GHZ:
|
|
rs_sta->expected_tpt = iwl3945_expected_tpt_a;
|
|
break;
|
|
case IEEE80211_NUM_BANDS:
|
|
BUG();
|
|
break;
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
spin_unlock_irqrestore(&rs_sta->lock, flags);
|
|
|
|
rssi = priv->last_rx_rssi;
|
|
if (rssi == 0)
|
|
rssi = IWL_MIN_RSSI_VAL;
|
|
|
|
IWL_DEBUG(IWL_DL_INFO | IWL_DL_RATE, "Network RSSI: %d\n", rssi);
|
|
|
|
rs_sta->start_rate = iwl3945_get_rate_index_by_rssi(rssi, priv->band);
|
|
|
|
IWL_DEBUG_RATE("leave: rssi %d assign rate index: "
|
|
"%d (plcp 0x%x)\n", rssi, rs_sta->start_rate,
|
|
iwl3945_rates[rs_sta->start_rate].plcp);
|
|
}
|
|
|
|
int iwl3945_rate_control_register(void)
|
|
{
|
|
return ieee80211_rate_control_register(&rs_ops);
|
|
}
|
|
|
|
void iwl3945_rate_control_unregister(void)
|
|
{
|
|
ieee80211_rate_control_unregister(&rs_ops);
|
|
}
|
|
|
|
|