251 lines
6.7 KiB
C
251 lines
6.7 KiB
C
/*-
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* Copyright (c) 2005 John Bicket
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
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* redistribution must be conditioned upon including a substantially
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* similar Disclaimer requirement for further binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
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* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGES.
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*
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* $FreeBSD: src/sys/dev/ath/ath_rate/sample/sample.h,v 1.3 2005/03/20 01:27:33 sam Exp $
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*/
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/*
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* Defintions for the Atheros Wireless LAN controller driver.
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*/
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#ifndef _DEV_ATH_RATE_SAMPLE_H
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#define _DEV_ATH_RATE_SAMPLE_H
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/* per-device state */
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struct sample_softc {
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struct ath_ratectrl arc; /* base state */
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int ath_smoothing_rate; /* ewma percentage (out of 100) */
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int ath_sample_rate; /* send a different bit-rate 1/X packets */
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};
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#define ATH_SOFTC_SAMPLE(sc) ((struct sample_softc *)sc->sc_rc)
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struct rate_info {
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int rate;
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int rix;
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int rateCode;
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int shortPreambleRateCode;
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};
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struct rate_stats {
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unsigned average_tx_time;
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int successive_failures;
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int tries;
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int total_packets;
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int packets_acked;
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unsigned perfect_tx_time; /* transmit time for 0 retries */
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int last_tx;
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};
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/*
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* for now, we track performance for three different packet
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* size buckets
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*/
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#define NUM_PACKET_SIZE_BINS 3
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static int packet_size_bins[NUM_PACKET_SIZE_BINS] = {250, 1600, 3000};
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/* per-node state */
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struct sample_node {
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int static_rate_ndx;
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int num_rates;
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struct rate_info rates[IEEE80211_RATE_MAXSIZE];
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struct rate_stats stats[NUM_PACKET_SIZE_BINS][IEEE80211_RATE_MAXSIZE];
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int last_sample_ndx[NUM_PACKET_SIZE_BINS];
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int current_sample_ndx[NUM_PACKET_SIZE_BINS];
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int packets_sent[NUM_PACKET_SIZE_BINS];
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int current_rate[NUM_PACKET_SIZE_BINS];
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int packets_since_switch[NUM_PACKET_SIZE_BINS];
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unsigned jiffies_since_switch[NUM_PACKET_SIZE_BINS];
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int packets_since_sample[NUM_PACKET_SIZE_BINS];
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unsigned sample_tt[NUM_PACKET_SIZE_BINS];
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};
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#define ATH_NODE_SAMPLE(an) ((struct sample_node *)&an[1])
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#ifndef MIN
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#define MIN(a,b) ((a) < (b) ? (a) : (b))
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#endif
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#ifndef MAX
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#define MAX(a,b) ((a) > (b) ? (a) : (b))
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#endif
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#define WIFI_CW_MIN 31
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#define WIFI_CW_MAX 1023
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struct ar5212_desc {
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/*
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* tx_control_0
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*/
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u_int32_t frame_len:12;
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u_int32_t reserved_12_15:4;
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u_int32_t xmit_power:6;
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u_int32_t rts_cts_enable:1;
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u_int32_t veol:1;
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u_int32_t clear_dest_mask:1;
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u_int32_t ant_mode_xmit:4;
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u_int32_t inter_req:1;
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u_int32_t encrypt_key_valid:1;
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u_int32_t cts_enable:1;
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/*
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* tx_control_1
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*/
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u_int32_t buf_len:12;
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u_int32_t more:1;
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u_int32_t encrypt_key_index:7;
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u_int32_t frame_type:4;
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u_int32_t no_ack:1;
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u_int32_t comp_proc:2;
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u_int32_t comp_iv_len:2;
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u_int32_t comp_icv_len:2;
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u_int32_t reserved_31:1;
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/*
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* tx_control_2
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*/
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u_int32_t rts_duration:15;
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u_int32_t duration_update_enable:1;
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u_int32_t xmit_tries0:4;
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u_int32_t xmit_tries1:4;
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u_int32_t xmit_tries2:4;
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u_int32_t xmit_tries3:4;
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/*
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* tx_control_3
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*/
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u_int32_t xmit_rate0:5;
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u_int32_t xmit_rate1:5;
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u_int32_t xmit_rate2:5;
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u_int32_t xmit_rate3:5;
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u_int32_t rts_cts_rate:5;
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u_int32_t reserved_25_31:7;
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/*
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* tx_status_0
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*/
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u_int32_t frame_xmit_ok:1;
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u_int32_t excessive_retries:1;
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u_int32_t fifo_underrun:1;
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u_int32_t filtered:1;
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u_int32_t rts_fail_count:4;
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u_int32_t data_fail_count:4;
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u_int32_t virt_coll_count:4;
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u_int32_t send_timestamp:16;
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/*
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* tx_status_1
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*/
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u_int32_t done:1;
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u_int32_t seq_num:12;
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u_int32_t ack_sig_strength:8;
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u_int32_t final_ts_index:2;
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u_int32_t comp_success:1;
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u_int32_t xmit_antenna:1;
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u_int32_t reserved_25_31_x:7;
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} __packed;
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/*
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* Calculate the transmit duration of a frame.
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*/
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static unsigned calc_usecs_unicast_packet(struct ath_softc *sc,
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int length,
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int rix, int short_retries, int long_retries) {
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const HAL_RATE_TABLE *rt = sc->sc_currates;
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/* pg 205 ieee.802.11.pdf */
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unsigned t_slot = 20;
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unsigned t_difs = 50;
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unsigned t_sifs = 10;
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struct ieee80211com *ic = &sc->sc_ic;
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int tt = 0;
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int x = 0;
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int cw = WIFI_CW_MIN;
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int cix = rt->info[rix].controlRate;
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int rts = 0;
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int cts = 0;
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KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
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if (rt->info[rix].phy == IEEE80211_T_OFDM) {
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t_slot = 9;
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t_sifs = 9;
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t_difs = 28;
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}
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if ((ic->ic_flags & IEEE80211_F_USEPROT) &&
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rt->info[rix].phy == IEEE80211_T_OFDM) {
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if (ic->ic_protmode == IEEE80211_PROT_RTSCTS)
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rts = 1;
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else if (ic->ic_protmode == IEEE80211_PROT_CTSONLY)
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cts = 1;
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cix = rt->info[sc->sc_protrix].controlRate;
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}
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if (length > ic->ic_rtsthreshold) {
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rts = 1;
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}
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if (rts || cts) {
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int ctsrate = rt->info[cix].rateCode;
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int ctsduration = 0;
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ctsrate |= rt->info[cix].shortPreamble;
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if (rts) /* SIFS + CTS */
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ctsduration += rt->info[cix].spAckDuration;
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ctsduration += ath_hal_computetxtime(sc->sc_ah,
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rt, length, rix, AH_TRUE);
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if (cts) /* SIFS + ACK */
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ctsduration += rt->info[cix].spAckDuration;
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tt += (short_retries + 1) * ctsduration;
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}
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tt += t_difs;
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tt += (long_retries+1)*(t_sifs + rt->info[cix].spAckDuration);
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tt += (long_retries+1)*ath_hal_computetxtime(sc->sc_ah, rt, length,
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rix, AH_TRUE);
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for (x = 0; x <= short_retries + long_retries; x++) {
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cw = MIN(WIFI_CW_MAX, (cw + 1) * 2);
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tt += (t_slot * cw/2);
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}
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return tt;
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}
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#endif /* _DEV_ATH_RATE_SAMPLE_H */
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