d5d2dbef65
doesn't get truncated to 32 bits. Without this, 3x3 NICs transmitting at an MCS rate whose rix (rate index) in the rate table is > 31 end up returning errors, as the sample rate code doesn't think the rate is set in the rate table. Tested: * AR9380, STA, speaking 3x3 to an AP
243 lines
6.9 KiB
C
243 lines
6.9 KiB
C
/*-
|
|
* 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 class */
|
|
int smoothing_rate; /* ewma percentage [0..99] */
|
|
int smoothing_minpackets;
|
|
int sample_rate; /* %time to try different tx rates */
|
|
int max_successive_failures;
|
|
int stale_failure_timeout; /* how long to honor max_successive_failures */
|
|
int min_switch; /* min time between rate changes */
|
|
int min_good_pct; /* min good percentage for a rate to be considered */
|
|
};
|
|
#define ATH_SOFTC_SAMPLE(sc) ((struct sample_softc *)sc->sc_rc)
|
|
|
|
struct rate_stats {
|
|
unsigned average_tx_time;
|
|
int successive_failures;
|
|
uint64_t tries;
|
|
uint64_t total_packets; /* pkts total since assoc */
|
|
uint64_t packets_acked; /* pkts acked since assoc */
|
|
int ewma_pct; /* EWMA percentage */
|
|
unsigned perfect_tx_time; /* transmit time for 0 retries */
|
|
int last_tx;
|
|
};
|
|
|
|
struct txschedule {
|
|
uint8_t t0, r0; /* series 0: tries, rate code */
|
|
uint8_t t1, r1; /* series 1: tries, rate code */
|
|
uint8_t t2, r2; /* series 2: tries, rate code */
|
|
uint8_t t3, r3; /* series 3: tries, rate code */
|
|
};
|
|
|
|
/*
|
|
* for now, we track performance for three different packet
|
|
* size buckets
|
|
*/
|
|
#define NUM_PACKET_SIZE_BINS 2
|
|
|
|
static const int packet_size_bins[NUM_PACKET_SIZE_BINS] = { 250, 1600 };
|
|
|
|
static inline int
|
|
bin_to_size(int index)
|
|
{
|
|
return packet_size_bins[index];
|
|
}
|
|
|
|
/* per-node state */
|
|
struct sample_node {
|
|
int static_rix; /* rate index of fixed tx rate */
|
|
#define SAMPLE_MAXRATES 64 /* NB: corresponds to hal info[32] */
|
|
uint64_t ratemask; /* bit mask of valid rate indices */
|
|
const struct txschedule *sched; /* tx schedule table */
|
|
|
|
const HAL_RATE_TABLE *currates;
|
|
|
|
struct rate_stats stats[NUM_PACKET_SIZE_BINS][SAMPLE_MAXRATES];
|
|
int last_sample_rix[NUM_PACKET_SIZE_BINS];
|
|
|
|
int current_sample_rix[NUM_PACKET_SIZE_BINS];
|
|
int packets_sent[NUM_PACKET_SIZE_BINS];
|
|
|
|
int current_rix[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];
|
|
};
|
|
|
|
#ifdef _KERNEL
|
|
|
|
#define ATH_NODE_SAMPLE(an) ((struct sample_node *)&(an)[1])
|
|
#define IS_RATE_DEFINED(sn, rix) (((uint64_t) (sn)->ratemask & (1ULL<<((uint64_t) rix))) != 0)
|
|
|
|
#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 short_retries,
|
|
int long_retries, int is_ht40)
|
|
{
|
|
const HAL_RATE_TABLE *rt = sc->sc_currates;
|
|
struct ifnet *ifp = sc->sc_ifp;
|
|
struct ieee80211com *ic = ifp->if_l2com;
|
|
int rts, cts;
|
|
|
|
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;
|
|
|
|
KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
|
|
|
|
if (rix >= rt->rateCount) {
|
|
printf("bogus rix %d, max %u, mode %u\n",
|
|
rix, rt->rateCount, sc->sc_curmode);
|
|
return 0;
|
|
}
|
|
cix = rt->info[rix].controlRate;
|
|
/*
|
|
* 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_HT:
|
|
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;
|
|
|
|
cix = rt->info[sc->sc_protrix].controlRate;
|
|
}
|
|
|
|
if (0 /*length > ic->ic_rtsthreshold */) {
|
|
rts = 1;
|
|
}
|
|
|
|
if (rts || cts) {
|
|
int ctsrate;
|
|
int ctsduration = 0;
|
|
|
|
/* NB: this is intentionally not a runtime check */
|
|
KASSERT(cix < rt->rateCount,
|
|
("bogus cix %d, max %u, mode %u\n", cix, rt->rateCount,
|
|
sc->sc_curmode));
|
|
|
|
ctsrate = rt->info[cix].rateCode | rt->info[cix].shortPreamble;
|
|
if (rts) /* SIFS + CTS */
|
|
ctsduration += rt->info[cix].spAckDuration;
|
|
|
|
/* XXX assumes short preamble */
|
|
ctsduration += ath_hal_pkt_txtime(sc->sc_ah, rt, length, rix,
|
|
is_ht40, 0);
|
|
|
|
if (cts) /* SIFS + ACK */
|
|
ctsduration += rt->info[cix].spAckDuration;
|
|
|
|
tt += (short_retries + 1) * ctsduration;
|
|
}
|
|
tt += t_difs;
|
|
|
|
/* XXX assumes short preamble */
|
|
tt += (long_retries+1)*ath_hal_pkt_txtime(sc->sc_ah, rt, length, rix,
|
|
is_ht40, 0);
|
|
|
|
tt += (long_retries+1)*(t_sifs + rt->info[rix].spAckDuration);
|
|
|
|
for (x = 0; x <= short_retries + long_retries; x++) {
|
|
cw = MIN(WIFI_CW_MAX, (cw + 1) * 2);
|
|
tt += (t_slot * cw/2);
|
|
}
|
|
return tt;
|
|
}
|
|
|
|
#endif /* _KERNEL */
|
|
|
|
#endif /* _DEV_ATH_RATE_SAMPLE_H */
|