980 lines
25 KiB
C
980 lines
25 KiB
C
/******************************************************************************
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*
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* Copyright(c) 2005 - 2011 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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* 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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*****************************************************************************/
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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 <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 "commands.h"
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#include "3945.h"
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#define RS_NAME "iwl-3945-rs"
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static s32 il3945_expected_tpt_g[RATE_COUNT_3945] = {
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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 il3945_expected_tpt_g_prot[RATE_COUNT_3945] = {
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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 il3945_expected_tpt_a[RATE_COUNT_3945] = {
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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 il3945_expected_tpt_b[RATE_COUNT_3945] = {
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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 il3945_tpt_entry {
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s8 min_rssi;
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u8 idx;
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};
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static struct il3945_tpt_entry il3945_tpt_table_a[] = {
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{-60, RATE_54M_IDX},
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{-64, RATE_48M_IDX},
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{-72, RATE_36M_IDX},
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{-80, RATE_24M_IDX},
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{-84, RATE_18M_IDX},
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{-85, RATE_12M_IDX},
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{-87, RATE_9M_IDX},
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{-89, RATE_6M_IDX}
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};
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static struct il3945_tpt_entry il3945_tpt_table_g[] = {
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{-60, RATE_54M_IDX},
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{-64, RATE_48M_IDX},
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{-68, RATE_36M_IDX},
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{-80, RATE_24M_IDX},
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{-84, RATE_18M_IDX},
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{-85, RATE_12M_IDX},
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{-86, RATE_11M_IDX},
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{-88, RATE_5M_IDX},
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{-90, RATE_2M_IDX},
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{-92, RATE_1M_IDX}
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};
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#define RATE_MAX_WINDOW 62
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#define RATE_FLUSH (3*HZ)
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#define RATE_WIN_FLUSH (HZ/2)
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#define IL39_RATE_HIGH_TH 11520
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#define IL_SUCCESS_UP_TH 8960
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#define IL_SUCCESS_DOWN_TH 10880
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#define RATE_MIN_FAILURE_TH 6
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#define RATE_MIN_SUCCESS_TH 8
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#define RATE_DECREASE_TH 1920
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#define RATE_RETRY_TH 15
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static u8
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il3945_get_rate_idx_by_rssi(s32 rssi, enum ieee80211_band band)
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{
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u32 idx = 0;
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u32 table_size = 0;
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struct il3945_tpt_entry *tpt_table = NULL;
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if (rssi < IL_MIN_RSSI_VAL || rssi > IL_MAX_RSSI_VAL)
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rssi = IL_MIN_RSSI_VAL;
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switch (band) {
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case IEEE80211_BAND_2GHZ:
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tpt_table = il3945_tpt_table_g;
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table_size = ARRAY_SIZE(il3945_tpt_table_g);
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break;
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case IEEE80211_BAND_5GHZ:
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tpt_table = il3945_tpt_table_a;
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table_size = ARRAY_SIZE(il3945_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 (idx < table_size && rssi < tpt_table[idx].min_rssi)
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idx++;
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idx = min(idx, table_size - 1);
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return tpt_table[idx].idx;
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}
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static void
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il3945_clear_win(struct il3945_rate_scale_data *win)
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{
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win->data = 0;
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win->success_counter = 0;
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win->success_ratio = -1;
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win->counter = 0;
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win->average_tpt = IL_INVALID_VALUE;
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win->stamp = 0;
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}
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/**
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* il3945_rate_scale_flush_wins - flush out the rate scale wins
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*
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* Returns the number of wins 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
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il3945_rate_scale_flush_wins(struct il3945_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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struct il_priv *il __maybe_unused = rs_sta->il;
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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 RATE_WIN_FLUSH
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* since we flushed, clear out the gathered stats
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*/
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for (i = 0; i < RATE_COUNT_3945; 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 + RATE_WIN_FLUSH)) {
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D_RATE("flushing %d samples of rate " "idx %d\n",
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rs_sta->win[i].counter, i);
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il3945_clear_win(&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 RATE_FLUSH_MAX 5000 /* msec */
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#define RATE_FLUSH_MIN 50 /* msec */
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#define IL_AVERAGE_PACKETS 1500
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static void
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il3945_bg_rate_scale_flush(unsigned long data)
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{
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struct il3945_rs_sta *rs_sta = (void *)data;
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struct il_priv *il __maybe_unused = rs_sta->il;
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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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D_RATE("enter\n");
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unflushed = il3945_rate_scale_flush_wins(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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if (unflushed) {
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duration =
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jiffies_to_msecs(jiffies - rs_sta->last_partial_flush);
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D_RATE("Tx'd %d packets in %dms\n", 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 = (IL_AVERAGE_PACKETS * 1000) / pps;
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if (duration < RATE_FLUSH_MIN)
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duration = RATE_FLUSH_MIN;
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else if (duration > RATE_FLUSH_MAX)
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duration = RATE_FLUSH_MAX;
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} else
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duration = RATE_FLUSH_MAX;
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rs_sta->flush_time = msecs_to_jiffies(duration);
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D_RATE("new flush period: %d msec ave %d\n", duration,
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packet_count);
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mod_timer(&rs_sta->rate_scale_flush,
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jiffies + rs_sta->flush_time);
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rs_sta->last_partial_flush = jiffies;
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} else {
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rs_sta->flush_time = RATE_FLUSH;
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rs_sta->flush_pending = 0;
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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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D_RATE("leave\n");
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}
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/**
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* il3945_collect_tx_data - Update the success/failure sliding win
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*
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* We keep a sliding win of the last 64 packets transmitted
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* at this rate. win->data contains the bitmask of successful
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* packets.
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*/
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static void
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il3945_collect_tx_data(struct il3945_rs_sta *rs_sta,
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struct il3945_rate_scale_data *win, int success,
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int retries, int idx)
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{
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unsigned long flags;
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s32 fail_count;
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struct il_priv *il __maybe_unused = rs_sta->il;
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if (!retries) {
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D_RATE("leave: retries == 0 -- should be at least 1\n");
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return;
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}
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spin_lock_irqsave(&rs_sta->lock, flags);
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/*
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* Keep track of only the latest 62 tx frame attempts in this rate's
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* history win; anything older isn't really relevant any more.
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* If we have filled up the sliding win, 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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* */
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while (retries > 0) {
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if (win->counter >= RATE_MAX_WINDOW) {
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/* remove earliest */
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win->counter = RATE_MAX_WINDOW - 1;
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if (win->data & (1ULL << (RATE_MAX_WINDOW - 1))) {
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win->data &= ~(1ULL << (RATE_MAX_WINDOW - 1));
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win->success_counter--;
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}
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}
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/* Increment frames-attempted counter */
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win->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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win->data <<= 1;
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if (success > 0) {
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win->success_counter++;
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win->data |= 0x1;
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success--;
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}
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retries--;
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}
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/* Calculate current success ratio, avoid divide-by-0! */
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if (win->counter > 0)
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win->success_ratio =
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128 * (100 * win->success_counter) / win->counter;
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else
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win->success_ratio = IL_INVALID_VALUE;
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fail_count = win->counter - win->success_counter;
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/* Calculate average throughput, if we have enough history. */
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if (fail_count >= RATE_MIN_FAILURE_TH ||
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win->success_counter >= RATE_MIN_SUCCESS_TH)
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win->average_tpt =
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((win->success_ratio * rs_sta->expected_tpt[idx] +
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64) / 128);
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else
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win->average_tpt = IL_INVALID_VALUE;
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/* Tag this win as having been updated */
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win->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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* Called after adding a new station to initialize rate scaling
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*/
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void
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il3945_rs_rate_init(struct il_priv *il, struct ieee80211_sta *sta, u8 sta_id)
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{
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struct ieee80211_hw *hw = il->hw;
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struct ieee80211_conf *conf = &il->hw->conf;
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struct il3945_sta_priv *psta;
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struct il3945_rs_sta *rs_sta;
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struct ieee80211_supported_band *sband;
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int i;
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D_INFO("enter\n");
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if (sta_id == il->hw_params.bcast_id)
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goto out;
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psta = (struct il3945_sta_priv *)sta->drv_priv;
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rs_sta = &psta->rs_sta;
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sband = hw->wiphy->bands[conf->chandef.chan->band];
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rs_sta->il = il;
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rs_sta->start_rate = RATE_INVALID;
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/* default to just 802.11b */
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rs_sta->expected_tpt = il3945_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 = 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 = il3945_bg_rate_scale_flush;
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for (i = 0; i < RATE_COUNT_3945; i++)
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il3945_clear_win(&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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* after assoc.. */
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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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break;
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}
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}
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il->_3945.sta_supp_rates = sta->supp_rates[sband->band];
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/* For 5 GHz band it start at IL_FIRST_OFDM_RATE */
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if (sband->band == IEEE80211_BAND_5GHZ) {
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rs_sta->last_txrate_idx += IL_FIRST_OFDM_RATE;
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il->_3945.sta_supp_rates <<= IL_FIRST_OFDM_RATE;
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}
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out:
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il->stations[sta_id].used &= ~IL_STA_UCODE_INPROGRESS;
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D_INFO("leave\n");
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}
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static void *
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il3945_rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
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{
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return hw->priv;
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}
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/* rate scale requires free function to be implemented */
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static void
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il3945_rs_free(void *il)
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{
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}
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static void *
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il3945_rs_alloc_sta(void *il_priv, struct ieee80211_sta *sta, gfp_t gfp)
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{
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struct il3945_rs_sta *rs_sta;
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struct il3945_sta_priv *psta = (void *)sta->drv_priv;
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struct il_priv *il __maybe_unused = il_priv;
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D_RATE("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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D_RATE("leave\n");
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return rs_sta;
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}
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static void
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il3945_rs_free_sta(void *il_priv, struct ieee80211_sta *sta, void *il_sta)
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{
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struct il3945_rs_sta *rs_sta = il_sta;
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/*
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* Be careful not to use any members of il3945_rs_sta (like trying
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* to use il_priv to print out debugging) since it may not be fully
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* initialized at this point.
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*/
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del_timer_sync(&rs_sta->rate_scale_flush);
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}
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/**
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* il3945_rs_tx_status - Update rate control values based on Tx results
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*
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* NOTE: Uses il_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
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il3945_rs_tx_status(void *il_rate, struct ieee80211_supported_band *sband,
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struct ieee80211_sta *sta, void *il_sta,
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struct sk_buff *skb)
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{
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s8 retries = 0, current_count;
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int scale_rate_idx, first_idx, last_idx;
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unsigned long flags;
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struct il_priv *il = (struct il_priv *)il_rate;
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struct il3945_rs_sta *rs_sta = il_sta;
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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D_RATE("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 > RATE_RETRY_TH)
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retries = RATE_RETRY_TH;
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first_idx = sband->bitrates[info->status.rates[0].idx].hw_value;
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if (first_idx < 0 || first_idx >= RATE_COUNT_3945) {
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D_RATE("leave: Rate out of bounds: %d\n", first_idx);
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return;
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}
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if (!il_sta) {
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D_RATE("leave: No STA il data to update!\n");
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return;
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}
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/* Treat uninitialized rate scaling data same as non-existing. */
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if (!rs_sta->il) {
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D_RATE("leave: STA il data uninitialized!\n");
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return;
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}
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rs_sta->tx_packets++;
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scale_rate_idx = first_idx;
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last_idx = first_idx;
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/*
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* Update the win 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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* il value 'retry_rate' vs. rate specific
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*
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* On exit from this while loop last_idx 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 > 1) {
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if ((retries - 1) < il->retry_rate) {
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current_count = (retries - 1);
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last_idx = scale_rate_idx;
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} else {
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current_count = il->retry_rate;
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last_idx = il3945_rs_next_rate(il, scale_rate_idx);
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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) */
|
|
il3945_collect_tx_data(rs_sta, &rs_sta->win[scale_rate_idx], 0,
|
|
current_count, scale_rate_idx);
|
|
D_RATE("Update rate %d for %d retries.\n", scale_rate_idx,
|
|
current_count);
|
|
|
|
retries -= current_count;
|
|
|
|
scale_rate_idx = last_idx;
|
|
}
|
|
|
|
/* Update the last idx win with success/failure based on ACK */
|
|
D_RATE("Update rate %d with %s.\n", last_idx,
|
|
(info->flags & IEEE80211_TX_STAT_ACK) ? "success" : "failure");
|
|
il3945_collect_tx_data(rs_sta, &rs_sta->win[last_idx],
|
|
info->flags & IEEE80211_TX_STAT_ACK, 1,
|
|
last_idx);
|
|
|
|
/* We updated the rate scale win -- 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_flush + rs_sta->flush_time)) {
|
|
|
|
rs_sta->last_partial_flush = jiffies;
|
|
rs_sta->flush_pending = 1;
|
|
mod_timer(&rs_sta->rate_scale_flush,
|
|
jiffies + rs_sta->flush_time);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&rs_sta->lock, flags);
|
|
|
|
D_RATE("leave\n");
|
|
}
|
|
|
|
static u16
|
|
il3945_get_adjacent_rate(struct il3945_rs_sta *rs_sta, u8 idx, u16 rate_mask,
|
|
enum ieee80211_band band)
|
|
{
|
|
u8 high = RATE_INVALID;
|
|
u8 low = RATE_INVALID;
|
|
struct il_priv *il __maybe_unused = rs_sta->il;
|
|
|
|
/* 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 = idx - 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 = idx + 1;
|
|
for (mask = (1 << i); i < RATE_COUNT_3945; i++, mask <<= 1) {
|
|
if (rate_mask & mask) {
|
|
high = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return (high << 8) | low;
|
|
}
|
|
|
|
low = idx;
|
|
while (low != RATE_INVALID) {
|
|
if (rs_sta->tgg)
|
|
low = il3945_rates[low].prev_rs_tgg;
|
|
else
|
|
low = il3945_rates[low].prev_rs;
|
|
if (low == RATE_INVALID)
|
|
break;
|
|
if (rate_mask & (1 << low))
|
|
break;
|
|
D_RATE("Skipping masked lower rate: %d\n", low);
|
|
}
|
|
|
|
high = idx;
|
|
while (high != RATE_INVALID) {
|
|
if (rs_sta->tgg)
|
|
high = il3945_rates[high].next_rs_tgg;
|
|
else
|
|
high = il3945_rates[high].next_rs;
|
|
if (high == RATE_INVALID)
|
|
break;
|
|
if (rate_mask & (1 << high))
|
|
break;
|
|
D_RATE("Skipping masked higher rate: %d\n", high);
|
|
}
|
|
|
|
return (high << 8) | low;
|
|
}
|
|
|
|
/**
|
|
* il3945_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 idx obtained below into the hw_mode's
|
|
* rate table and must reference the driver allocated rate table
|
|
*
|
|
*/
|
|
static void
|
|
il3945_rs_get_rate(void *il_r, struct ieee80211_sta *sta, void *il_sta,
|
|
struct ieee80211_tx_rate_control *txrc)
|
|
{
|
|
struct ieee80211_supported_band *sband = txrc->sband;
|
|
struct sk_buff *skb = txrc->skb;
|
|
u8 low = RATE_INVALID;
|
|
u8 high = RATE_INVALID;
|
|
u16 high_low;
|
|
int idx;
|
|
struct il3945_rs_sta *rs_sta = il_sta;
|
|
struct il3945_rate_scale_data *win = NULL;
|
|
int current_tpt = IL_INVALID_VALUE;
|
|
int low_tpt = IL_INVALID_VALUE;
|
|
int high_tpt = IL_INVALID_VALUE;
|
|
u32 fail_count;
|
|
s8 scale_action = 0;
|
|
unsigned long flags;
|
|
u16 rate_mask;
|
|
s8 max_rate_idx = -1;
|
|
struct il_priv *il __maybe_unused = (struct il_priv *)il_r;
|
|
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
|
|
|
|
D_RATE("enter\n");
|
|
|
|
/* Treat uninitialized rate scaling data same as non-existing. */
|
|
if (rs_sta && !rs_sta->il) {
|
|
D_RATE("Rate scaling information not initialized yet.\n");
|
|
il_sta = NULL;
|
|
}
|
|
|
|
if (rate_control_send_low(sta, il_sta, txrc))
|
|
return;
|
|
|
|
rate_mask = sta->supp_rates[sband->band];
|
|
|
|
/* get user max rate if set */
|
|
max_rate_idx = txrc->max_rate_idx;
|
|
if (sband->band == IEEE80211_BAND_5GHZ && max_rate_idx != -1)
|
|
max_rate_idx += IL_FIRST_OFDM_RATE;
|
|
if (max_rate_idx < 0 || max_rate_idx >= RATE_COUNT)
|
|
max_rate_idx = -1;
|
|
|
|
idx = min(rs_sta->last_txrate_idx & 0xffff, RATE_COUNT_3945 - 1);
|
|
|
|
if (sband->band == IEEE80211_BAND_5GHZ)
|
|
rate_mask = rate_mask << IL_FIRST_OFDM_RATE;
|
|
|
|
spin_lock_irqsave(&rs_sta->lock, flags);
|
|
|
|
/* for recent assoc, choose best rate regarding
|
|
* to rssi value
|
|
*/
|
|
if (rs_sta->start_rate != RATE_INVALID) {
|
|
if (rs_sta->start_rate < idx &&
|
|
(rate_mask & (1 << rs_sta->start_rate)))
|
|
idx = rs_sta->start_rate;
|
|
rs_sta->start_rate = RATE_INVALID;
|
|
}
|
|
|
|
/* force user max rate if set by user */
|
|
if (max_rate_idx != -1 && max_rate_idx < idx) {
|
|
if (rate_mask & (1 << max_rate_idx))
|
|
idx = max_rate_idx;
|
|
}
|
|
|
|
win = &(rs_sta->win[idx]);
|
|
|
|
fail_count = win->counter - win->success_counter;
|
|
|
|
if (fail_count < RATE_MIN_FAILURE_TH &&
|
|
win->success_counter < RATE_MIN_SUCCESS_TH) {
|
|
spin_unlock_irqrestore(&rs_sta->lock, flags);
|
|
|
|
D_RATE("Invalid average_tpt on rate %d: "
|
|
"counter: %d, success_counter: %d, "
|
|
"expected_tpt is %sNULL\n", idx, win->counter,
|
|
win->success_counter,
|
|
rs_sta->expected_tpt ? "not " : "");
|
|
|
|
/* Can't calculate this yet; not enough history */
|
|
win->average_tpt = IL_INVALID_VALUE;
|
|
goto out;
|
|
|
|
}
|
|
|
|
current_tpt = win->average_tpt;
|
|
|
|
high_low =
|
|
il3945_get_adjacent_rate(rs_sta, idx, rate_mask, sband->band);
|
|
low = high_low & 0xff;
|
|
high = (high_low >> 8) & 0xff;
|
|
|
|
/* If user set max rate, dont allow higher than user constrain */
|
|
if (max_rate_idx != -1 && max_rate_idx < high)
|
|
high = RATE_INVALID;
|
|
|
|
/* Collect Measured throughputs of adjacent rates */
|
|
if (low != RATE_INVALID)
|
|
low_tpt = rs_sta->win[low].average_tpt;
|
|
|
|
if (high != RATE_INVALID)
|
|
high_tpt = rs_sta->win[high].average_tpt;
|
|
|
|
spin_unlock_irqrestore(&rs_sta->lock, flags);
|
|
|
|
scale_action = 0;
|
|
|
|
/* Low success ratio , need to drop the rate */
|
|
if (win->success_ratio < RATE_DECREASE_TH || !current_tpt) {
|
|
D_RATE("decrease rate because of low success_ratio\n");
|
|
scale_action = -1;
|
|
/* No throughput measured yet for adjacent rates,
|
|
* try increase */
|
|
} else if (low_tpt == IL_INVALID_VALUE && high_tpt == IL_INVALID_VALUE) {
|
|
|
|
if (high != RATE_INVALID &&
|
|
win->success_ratio >= RATE_INCREASE_TH)
|
|
scale_action = 1;
|
|
else if (low != RATE_INVALID)
|
|
scale_action = 0;
|
|
|
|
/* Both adjacent throughputs are measured, but neither one has
|
|
* better throughput; we're using the best rate, don't change
|
|
* it! */
|
|
} else if (low_tpt != IL_INVALID_VALUE && high_tpt != IL_INVALID_VALUE
|
|
&& low_tpt < current_tpt && high_tpt < current_tpt) {
|
|
|
|
D_RATE("No action -- low [%d] & high [%d] < "
|
|
"current_tpt [%d]\n", low_tpt, high_tpt, current_tpt);
|
|
scale_action = 0;
|
|
|
|
/* At least one of the rates has better throughput */
|
|
} else {
|
|
if (high_tpt != IL_INVALID_VALUE) {
|
|
|
|
/* High rate has better throughput, Increase
|
|
* rate */
|
|
if (high_tpt > current_tpt &&
|
|
win->success_ratio >= RATE_INCREASE_TH)
|
|
scale_action = 1;
|
|
else {
|
|
D_RATE("decrease rate because of high tpt\n");
|
|
scale_action = 0;
|
|
}
|
|
} else if (low_tpt != IL_INVALID_VALUE) {
|
|
if (low_tpt > current_tpt) {
|
|
D_RATE("decrease rate because of low tpt\n");
|
|
scale_action = -1;
|
|
} else if (win->success_ratio >= RATE_INCREASE_TH) {
|
|
/* Lower rate has better
|
|
* throughput,decrease rate */
|
|
scale_action = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Sanity check; asked for decrease, but success rate or throughput
|
|
* has been good at old rate. Don't change it. */
|
|
if (scale_action == -1 && low != RATE_INVALID &&
|
|
(win->success_ratio > RATE_HIGH_TH ||
|
|
current_tpt > 100 * rs_sta->expected_tpt[low]))
|
|
scale_action = 0;
|
|
|
|
switch (scale_action) {
|
|
case -1:
|
|
/* Decrese rate */
|
|
if (low != RATE_INVALID)
|
|
idx = low;
|
|
break;
|
|
case 1:
|
|
/* Increase rate */
|
|
if (high != RATE_INVALID)
|
|
idx = high;
|
|
|
|
break;
|
|
case 0:
|
|
default:
|
|
/* No change */
|
|
break;
|
|
}
|
|
|
|
D_RATE("Selected %d (action %d) - low %d high %d\n", idx, scale_action,
|
|
low, high);
|
|
|
|
out:
|
|
|
|
if (sband->band == IEEE80211_BAND_5GHZ) {
|
|
if (WARN_ON_ONCE(idx < IL_FIRST_OFDM_RATE))
|
|
idx = IL_FIRST_OFDM_RATE;
|
|
rs_sta->last_txrate_idx = idx;
|
|
info->control.rates[0].idx = idx - IL_FIRST_OFDM_RATE;
|
|
} else {
|
|
rs_sta->last_txrate_idx = idx;
|
|
info->control.rates[0].idx = rs_sta->last_txrate_idx;
|
|
}
|
|
|
|
D_RATE("leave: %d\n", idx);
|
|
}
|
|
|
|
#ifdef CONFIG_MAC80211_DEBUGFS
|
|
|
|
static ssize_t
|
|
il3945_sta_dbgfs_stats_table_read(struct file *file, char __user *user_buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char *buff;
|
|
int desc = 0;
|
|
int j;
|
|
ssize_t ret;
|
|
struct il3945_rs_sta *lq_sta = file->private_data;
|
|
|
|
buff = kmalloc(1024, GFP_KERNEL);
|
|
if (!buff)
|
|
return -ENOMEM;
|
|
|
|
desc +=
|
|
sprintf(buff + desc,
|
|
"tx packets=%d last rate idx=%d\n"
|
|
"rate=0x%X flush time %d\n", lq_sta->tx_packets,
|
|
lq_sta->last_txrate_idx, lq_sta->start_rate,
|
|
jiffies_to_msecs(lq_sta->flush_time));
|
|
for (j = 0; j < RATE_COUNT_3945; j++) {
|
|
desc +=
|
|
sprintf(buff + desc, "counter=%d success=%d %%=%d\n",
|
|
lq_sta->win[j].counter,
|
|
lq_sta->win[j].success_counter,
|
|
lq_sta->win[j].success_ratio);
|
|
}
|
|
ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
|
|
kfree(buff);
|
|
return ret;
|
|
}
|
|
|
|
static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
|
|
.read = il3945_sta_dbgfs_stats_table_read,
|
|
.open = simple_open,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
static void
|
|
il3945_add_debugfs(void *il, void *il_sta, struct dentry *dir)
|
|
{
|
|
struct il3945_rs_sta *lq_sta = il_sta;
|
|
|
|
lq_sta->rs_sta_dbgfs_stats_table_file =
|
|
debugfs_create_file("rate_stats_table", 0600, dir, lq_sta,
|
|
&rs_sta_dbgfs_stats_table_ops);
|
|
|
|
}
|
|
|
|
static void
|
|
il3945_remove_debugfs(void *il, void *il_sta)
|
|
{
|
|
struct il3945_rs_sta *lq_sta = il_sta;
|
|
debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Initialization of rate scaling information is done by driver after
|
|
* the station is added. Since mac80211 calls this function before a
|
|
* station is added we ignore it.
|
|
*/
|
|
static void
|
|
il3945_rs_rate_init_stub(void *il_r, struct ieee80211_supported_band *sband,
|
|
struct ieee80211_sta *sta, void *il_sta)
|
|
{
|
|
}
|
|
|
|
static struct rate_control_ops rs_ops = {
|
|
.module = NULL,
|
|
.name = RS_NAME,
|
|
.tx_status = il3945_rs_tx_status,
|
|
.get_rate = il3945_rs_get_rate,
|
|
.rate_init = il3945_rs_rate_init_stub,
|
|
.alloc = il3945_rs_alloc,
|
|
.free = il3945_rs_free,
|
|
.alloc_sta = il3945_rs_alloc_sta,
|
|
.free_sta = il3945_rs_free_sta,
|
|
#ifdef CONFIG_MAC80211_DEBUGFS
|
|
.add_sta_debugfs = il3945_add_debugfs,
|
|
.remove_sta_debugfs = il3945_remove_debugfs,
|
|
#endif
|
|
|
|
};
|
|
|
|
void
|
|
il3945_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
|
|
{
|
|
struct il_priv *il = hw->priv;
|
|
s32 rssi = 0;
|
|
unsigned long flags;
|
|
struct il3945_rs_sta *rs_sta;
|
|
struct ieee80211_sta *sta;
|
|
struct il3945_sta_priv *psta;
|
|
|
|
D_RATE("enter\n");
|
|
|
|
rcu_read_lock();
|
|
|
|
sta = ieee80211_find_sta(il->vif, il->stations[sta_id].sta.sta.addr);
|
|
if (!sta) {
|
|
D_RATE("Unable to find station to initialize rate scaling.\n");
|
|
rcu_read_unlock();
|
|
return;
|
|
}
|
|
|
|
psta = (void *)sta->drv_priv;
|
|
rs_sta = &psta->rs_sta;
|
|
|
|
spin_lock_irqsave(&rs_sta->lock, flags);
|
|
|
|
rs_sta->tgg = 0;
|
|
switch (il->band) {
|
|
case IEEE80211_BAND_2GHZ:
|
|
/* TODO: this always does G, not a regression */
|
|
if (il->active.flags & RXON_FLG_TGG_PROTECT_MSK) {
|
|
rs_sta->tgg = 1;
|
|
rs_sta->expected_tpt = il3945_expected_tpt_g_prot;
|
|
} else
|
|
rs_sta->expected_tpt = il3945_expected_tpt_g;
|
|
break;
|
|
case IEEE80211_BAND_5GHZ:
|
|
rs_sta->expected_tpt = il3945_expected_tpt_a;
|
|
break;
|
|
default:
|
|
BUG();
|
|
break;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&rs_sta->lock, flags);
|
|
|
|
rssi = il->_3945.last_rx_rssi;
|
|
if (rssi == 0)
|
|
rssi = IL_MIN_RSSI_VAL;
|
|
|
|
D_RATE("Network RSSI: %d\n", rssi);
|
|
|
|
rs_sta->start_rate = il3945_get_rate_idx_by_rssi(rssi, il->band);
|
|
|
|
D_RATE("leave: rssi %d assign rate idx: " "%d (plcp 0x%x)\n", rssi,
|
|
rs_sta->start_rate, il3945_rates[rs_sta->start_rate].plcp);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
int
|
|
il3945_rate_control_register(void)
|
|
{
|
|
return ieee80211_rate_control_register(&rs_ops);
|
|
}
|
|
|
|
void
|
|
il3945_rate_control_unregister(void)
|
|
{
|
|
ieee80211_rate_control_unregister(&rs_ops);
|
|
}
|