/*-
* Copyright (c) 2005 John Bicket
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
* redistribution must be conditioned upon including a substantially
* similar Disclaimer requirement for further binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGES.
*
* $FreeBSD: src/sys/dev/ath/ath_rate/sample/sample.h,v 1.3 2005/03/20 01:27:33 sam Exp $
*/
/*
* Defintions for the Atheros Wireless LAN controller driver.
*/
#ifndef _DEV_ATH_RATE_SAMPLE_H
#define _DEV_ATH_RATE_SAMPLE_H
/* per-device state */
struct sample_softc {
struct ath_ratectrl arc; /* base state */
int ath_smoothing_rate; /* ewma percentage (out of 100) */
int ath_sample_rate; /* send a different bit-rate 1/X packets */
};
#define ATH_SOFTC_SAMPLE(sc) ((struct sample_softc *)sc->sc_rc)
struct rate_info {
int rate;
int rix;
int rateCode;
int shortPreambleRateCode;
};
struct rate_stats {
unsigned average_tx_time;
int successive_failures;
int tries;
int total_packets;
int packets_acked;
unsigned perfect_tx_time; /* transmit time for 0 retries */
int last_tx;
};
/*
* for now, we track performance for three different packet
* size buckets
*/
#define NUM_PACKET_SIZE_BINS 3
static int packet_size_bins[NUM_PACKET_SIZE_BINS] = {250, 1600, 3000};
/* per-node state */
struct sample_node {
int static_rate_ndx;
int num_rates;
struct rate_info rates[IEEE80211_RATE_MAXSIZE];
struct rate_stats stats[NUM_PACKET_SIZE_BINS][IEEE80211_RATE_MAXSIZE];
int last_sample_ndx[NUM_PACKET_SIZE_BINS];
int current_sample_ndx[NUM_PACKET_SIZE_BINS];
int packets_sent[NUM_PACKET_SIZE_BINS];
int current_rate[NUM_PACKET_SIZE_BINS];
int packets_since_switch[NUM_PACKET_SIZE_BINS];
unsigned ticks_since_switch[NUM_PACKET_SIZE_BINS];
int packets_since_sample[NUM_PACKET_SIZE_BINS];
unsigned sample_tt[NUM_PACKET_SIZE_BINS];
};
#define ATH_NODE_SAMPLE(an) ((struct sample_node *)&an[1])
/*
* Calculate the transmit duration of a frame.
*/
static unsigned calc_usecs_unicast_packet(struct ath_softc *sc,
int length,
int rix, int short_retries, int long_retries) {
const HAL_RATE_TABLE *rt = sc->sc_currates;
int rts, cts;
unsigned t_slot = 20;
unsigned t_difs = 50;
unsigned t_sifs = 10;
struct ieee80211com *ic = &sc->sc_ic;
int tt = 0;
int x = 0;
int cw = WIFI_CW_MIN;
int cix = rt->info[rix].controlRate;
KASSERTMSG(rt != NULL, "no rate table, mode %u", sc->sc_curmode);
if (!rt->info[rix].rateKbps) {
printf("rix %d (%d) bad ratekbps %d mode %u",
rix, rt->info[rix].dot11Rate,
rt->info[rix].rateKbps,
sc->sc_curmode);
return 0;
}
/*
* XXX getting mac/phy level timings should be fixed for turbo
* rates, and there is probably a way to get this from the
* hal...
*/
switch (rt->info[rix].phy) {
case IEEE80211_T_OFDM:
t_slot = 9;
t_sifs = 16;
t_difs = 28;
/* fall through */
case IEEE80211_T_TURBO:
t_slot = 9;
t_sifs = 8;
t_difs = 28;
break;
case IEEE80211_T_DS:
/* fall through to default */
default:
/* pg 205 ieee.802.11.pdf */
t_slot = 20;
t_difs = 50;
t_sifs = 10;
}
rts = cts = 0;
if ((ic->ic_flags & IEEE80211_F_USEPROT) &&
rt->info[rix].phy == IEEE80211_T_OFDM) {
if (ic->ic_protmode == IEEE80211_PROT_RTSCTS)
rts = 1;
else if (ic->ic_protmode == IEEE80211_PROT_CTSONLY)
cts = 1;
