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Diffstat (limited to 'sys/dev/ath/ath_rate/sample/sample.h')
-rw-r--r-- | sys/dev/ath/ath_rate/sample/sample.h | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/sys/dev/ath/ath_rate/sample/sample.h b/sys/dev/ath/ath_rate/sample/sample.h new file mode 100644 index 0000000..3c6c5e4 --- /dev/null +++ b/sys/dev/ath/ath_rate/sample/sample.h @@ -0,0 +1,136 @@ +/*- + * 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. + * + * $FreeBSD$ + */ + +/* + * 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 { + int average_tx_time; + int successive_failures; + int tries; + int total_packets; + int packets_acked; + int 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 sample_num[NUM_PACKET_SIZE_BINS]; + int packets_sent[NUM_PACKET_SIZE_BINS]; + +}; +#define ATH_NODE_SAMPLE(an) ((struct sample_node *)&an[1]) + +#ifndef MIN +#define MIN(a,b) ((a) < (b) ? (a) : (b)) +#endif +#ifndef MAX +#define MAX(a,b) ((a) > (b) ? (a) : (b)) +#endif + +#define WIFI_CW_MIN 31 +#define WIFI_CW_MAX 1023 + +/* + * Calculate the transmit duration of a frame. + */ +static unsigned calc_usecs_unicast_packet(struct ath_softc *sc, + int length, + int rix, int retries) { + const HAL_RATE_TABLE *rt = sc->sc_currates; + + + /* pg 205 ieee.802.11.pdf */ + unsigned t_slot = 20; + unsigned t_difs = 50; + unsigned t_sifs = 10; + int tt = 0; + int x = 0; + int cw = WIFI_CW_MIN; + int cix = rt->info[rix].controlRate; + KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode)); + + if (rt->info[rix].phy == IEEE80211_T_OFDM) { + t_slot = 9; + t_sifs = 9; + t_difs = 28; + } + tt += t_difs; + tt += (retries+1)*(t_sifs + rt->info[cix].spAckDuration); + tt += (retries+1)*ath_hal_computetxtime(sc->sc_ah, rt, length, + rix, AH_TRUE); + for (x = 0; x <= retries; x++) { + cw = MIN(WIFI_CW_MAX, (cw + 1) * 2); + tt += (t_slot * cw/2); + } + return tt; +} +#endif /* _DEV_ATH_RATE_SAMPLE_H */ |