3fa8d0321a
the channel width is ni->ni_chw, which is set to the negotiated channel width. ni->ni_htflags is the capability, rather than the negotiated value. Teach both the TX path and the sample rate module about this.
997 lines
30 KiB
C
997 lines
30 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.
|
|
*
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
/*
|
|
* John Bicket's SampleRate control algorithm.
|
|
*/
|
|
#include "opt_inet.h"
|
|
#include "opt_wlan.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/errno.h>
|
|
|
|
#include <machine/bus.h>
|
|
#include <machine/resource.h>
|
|
#include <sys/bus.h>
|
|
|
|
#include <sys/socket.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/if_media.h>
|
|
#include <net/if_arp.h>
|
|
#include <net/ethernet.h> /* XXX for ether_sprintf */
|
|
|
|
#include <net80211/ieee80211_var.h>
|
|
|
|
#include <net/bpf.h>
|
|
|
|
#ifdef INET
|
|
#include <netinet/in.h>
|
|
#include <netinet/if_ether.h>
|
|
#endif
|
|
|
|
#include <dev/ath/if_athvar.h>
|
|
#include <dev/ath/ath_rate/sample/sample.h>
|
|
#include <dev/ath/ath_hal/ah_desc.h>
|
|
#include <dev/ath/ath_rate/sample/tx_schedules.h>
|
|
|
|
/*
|
|
* This file is an implementation of the SampleRate algorithm
|
|
* in "Bit-rate Selection in Wireless Networks"
|
|
* (http://www.pdos.lcs.mit.edu/papers/jbicket-ms.ps)
|
|
*
|
|
* SampleRate chooses the bit-rate it predicts will provide the most
|
|
* throughput based on estimates of the expected per-packet
|
|
* transmission time for each bit-rate. SampleRate periodically sends
|
|
* packets at bit-rates other than the current one to estimate when
|
|
* another bit-rate will provide better performance. SampleRate
|
|
* switches to another bit-rate when its estimated per-packet
|
|
* transmission time becomes smaller than the current bit-rate's.
|
|
* SampleRate reduces the number of bit-rates it must sample by
|
|
* eliminating those that could not perform better than the one
|
|
* currently being used. SampleRate also stops probing at a bit-rate
|
|
* if it experiences several successive losses.
|
|
*
|
|
* The difference between the algorithm in the thesis and the one in this
|
|
* file is that the one in this file uses a ewma instead of a window.
|
|
*
|
|
* Also, this implementation tracks the average transmission time for
|
|
* a few different packet sizes independently for each link.
|
|
*/
|
|
|
|
static void ath_rate_ctl_reset(struct ath_softc *, struct ieee80211_node *);
|
|
|
|
static const int packet_size_bins[NUM_PACKET_SIZE_BINS] = { 250, 1600 };
|
|
|
|
static __inline int
|
|
size_to_bin(int size)
|
|
{
|
|
#if NUM_PACKET_SIZE_BINS > 1
|
|
if (size <= packet_size_bins[0])
|
|
return 0;
|
|
#endif
|
|
#if NUM_PACKET_SIZE_BINS > 2
|
|
if (size <= packet_size_bins[1])
|
|
return 1;
|
|
#endif
|
|
#if NUM_PACKET_SIZE_BINS > 3
|
|
if (size <= packet_size_bins[2])
|
|
return 2;
|
|
#endif
|
|
#if NUM_PACKET_SIZE_BINS > 4
|
|
#error "add support for more packet sizes"
|
|
#endif
|
|
return NUM_PACKET_SIZE_BINS-1;
|
|
}
|
|
|
|
static __inline int
|
|
bin_to_size(int index)
|
|
{
|
|
return packet_size_bins[index];
|
|
}
|
|
|
|
void
|
|
ath_rate_node_init(struct ath_softc *sc, struct ath_node *an)
|
|
{
|
|
/* NB: assumed to be zero'd by caller */
|
|
}
|
|
|
|
void
|
|
ath_rate_node_cleanup(struct ath_softc *sc, struct ath_node *an)
|
|
{
|
|
}
|
|
|
|
static int
|
|
dot11rate(const HAL_RATE_TABLE *rt, int rix)
|
|
{
|
|
return rt->info[rix].phy == IEEE80211_T_HT ?
|
|
rt->info[rix].dot11Rate : (rt->info[rix].dot11Rate & IEEE80211_RATE_VAL) / 2;
|
|
}
|
|
|
|
static const char *
|
|
dot11rate_label(const HAL_RATE_TABLE *rt, int rix)
|
|
{
|
|
return rt->info[rix].phy == IEEE80211_T_HT ? "MCS" : "Mb ";
|
|
}
|
|
|
|
/*
|
|
* Return the rix with the lowest average_tx_time,
|
|
* or -1 if all the average_tx_times are 0.
|
|
*/
|
|
static __inline int
|
|
pick_best_rate(struct sample_node *sn, const HAL_RATE_TABLE *rt,
|
|
int size_bin, int require_acked_before)
|
|
{
|
|
int best_rate_rix, best_rate_tt;
|
|
uint32_t mask;
|
|
int rix, tt;
|
|
|
|
best_rate_rix = 0;
|
|
best_rate_tt = 0;
|
|
for (mask = sn->ratemask, rix = 0; mask != 0; mask >>= 1, rix++) {
|
|
if ((mask & 1) == 0) /* not a supported rate */
|
|
continue;
|
|
|
|
tt = sn->stats[size_bin][rix].average_tx_time;
|
|
if (tt <= 0 ||
|
|
(require_acked_before &&
|
|
!sn->stats[size_bin][rix].packets_acked))
|
|
continue;
|
|
|
|
/* don't use a bit-rate that has been failing */
|
|
if (sn->stats[size_bin][rix].successive_failures > 3)
|
|
continue;
|
|
|
|
if (best_rate_tt == 0 || tt < best_rate_tt) {
|
|
best_rate_tt = tt;
|
|
best_rate_rix = rix;
|
|
}
|
|
}
|
|
return (best_rate_tt ? best_rate_rix : -1);
|
|
}
|
|
|
|
/*
|
|
* Pick a good "random" bit-rate to sample other than the current one.
|
|
*/
|
|
static __inline int
|
|
pick_sample_rate(struct sample_softc *ssc , struct sample_node *sn,
|
|
const HAL_RATE_TABLE *rt, int size_bin)
|
|
{
|
|
#define DOT11RATE(ix) (rt->info[ix].dot11Rate & IEEE80211_RATE_VAL)
|
|
#define MCS(ix) (rt->info[ix].dot11Rate | IEEE80211_RATE_MCS)
|
|
int current_rix, rix;
|
|
unsigned current_tt;
|
|
uint32_t mask;
|
|
|
|
current_rix = sn->current_rix[size_bin];
|
|
if (current_rix < 0) {
|
|
/* no successes yet, send at the lowest bit-rate */
|
|
return 0;
|
|
}
|
|
|
|
current_tt = sn->stats[size_bin][current_rix].average_tx_time;
|
|
|
|
rix = sn->last_sample_rix[size_bin]+1; /* next sample rate */
|
|
mask = sn->ratemask &~ (1<<current_rix);/* don't sample current rate */
|
|
while (mask != 0) {
|
|
if ((mask & (1<<rix)) == 0) { /* not a supported rate */
|
|
nextrate:
|
|
if (++rix >= rt->rateCount)
|
|
rix = 0;
|
|
continue;
|
|
}
|
|
|
|
/* this bit-rate is always worse than the current one */
|
|
if (sn->stats[size_bin][rix].perfect_tx_time > current_tt) {
|
|
mask &= ~(1<<rix);
|
|
goto nextrate;
|
|
}
|
|
|
|
/* rarely sample bit-rates that fail a lot */
|
|
if (sn->stats[size_bin][rix].successive_failures > ssc->max_successive_failures &&
|
|
ticks - sn->stats[size_bin][rix].last_tx < ssc->stale_failure_timeout) {
|
|
mask &= ~(1<<rix);
|
|
goto nextrate;
|
|
}
|
|
|
|
/* don't sample more than 2 rates higher for rates > 11M */
|
|
if (DOT11RATE(rix) > 2*11 && rix > current_rix + 2) {
|
|
mask &= ~(1<<rix);
|
|
goto nextrate;
|
|
}
|
|
|
|
sn->last_sample_rix[size_bin] = rix;
|
|
return rix;
|
|
}
|
|
return current_rix;
|
|
#undef DOT11RATE
|
|
#undef MCS
|
|
}
|
|
|
|
static int
|
|
ath_rate_get_static_rix(struct ath_softc *sc, const struct ieee80211_node *ni)
|
|
{
|
|
#define RATE(_ix) (ni->ni_rates.rs_rates[(_ix)] & IEEE80211_RATE_VAL)
|
|
#define DOT11RATE(_ix) (rt->info[(_ix)].dot11Rate & IEEE80211_RATE_VAL)
|
|
#define MCS(_ix) (ni->ni_htrates.rs_rates[_ix] | IEEE80211_RATE_MCS)
|
|
const struct ieee80211_txparam *tp = ni->ni_txparms;
|
|
int srate;
|
|
|
|
/* Check MCS rates */
|
|
for (srate = ni->ni_htrates.rs_nrates - 1; srate >= 0; srate--) {
|
|
if (MCS(srate) == tp->ucastrate)
|
|
return sc->sc_rixmap[tp->ucastrate];
|
|
}
|
|
|
|
/* Check legacy rates */
|
|
for (srate = ni->ni_rates.rs_nrates - 1; srate >= 0; srate--) {
|
|
if (RATE(srate) == tp->ucastrate)
|
|
return sc->sc_rixmap[tp->ucastrate];
|
|
}
|
|
return -1;
|
|
#undef RATE
|
|
#undef DOT11RATE
|
|
#undef MCS
|
|
}
|
|
|
|
static void
|
|
ath_rate_update_static_rix(struct ath_softc *sc, struct ieee80211_node *ni)
|
|
{
|
|
struct ath_node *an = ATH_NODE(ni);
|
|
const struct ieee80211_txparam *tp = ni->ni_txparms;
|
|
struct sample_node *sn = ATH_NODE_SAMPLE(an);
|
|
|
|
if (tp != NULL && tp->ucastrate != IEEE80211_FIXED_RATE_NONE) {
|
|
/*
|
|
* A fixed rate is to be used; ucastrate is the IEEE code
|
|
* for this rate (sans basic bit). Check this against the
|
|
* negotiated rate set for the node. Note the fixed rate
|
|
* may not be available for various reasons so we only
|
|
* setup the static rate index if the lookup is successful.
|
|
*/
|
|
sn->static_rix = ath_rate_get_static_rix(sc, ni);
|
|
} else {
|
|
sn->static_rix = -1;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
void
|
|
ath_rate_findrate(struct ath_softc *sc, struct ath_node *an,
|
|
int shortPreamble, size_t frameLen,
|
|
u_int8_t *rix0, int *try0, u_int8_t *txrate)
|
|
{
|
|
#define DOT11RATE(ix) (rt->info[ix].dot11Rate & IEEE80211_RATE_VAL)
|
|
#define MCS(ix) (rt->info[ix].dot11Rate | IEEE80211_RATE_MCS)
|
|
#define RATE(ix) (DOT11RATE(ix) / 2)
|
|
struct sample_node *sn = ATH_NODE_SAMPLE(an);
|
|
struct sample_softc *ssc = ATH_SOFTC_SAMPLE(sc);
|
|
struct ifnet *ifp = sc->sc_ifp;
|
|
struct ieee80211com *ic = ifp->if_l2com;
|
|
const HAL_RATE_TABLE *rt = sc->sc_currates;
|
|
const int size_bin = size_to_bin(frameLen);
|
|
int rix, mrr, best_rix, change_rates;
|
|
unsigned average_tx_time;
|
|
|
|
ath_rate_update_static_rix(sc, &an->an_node);
|
|
|
|
if (sn->static_rix != -1) {
|
|
rix = sn->static_rix;
|
|
*try0 = ATH_TXMAXTRY;
|
|
goto done;
|
|
}
|
|
|
|
/* XXX TODO: this doesn't know about 11gn vs 11g protection; teach it */
|
|
mrr = sc->sc_mrretry && !(ic->ic_flags & IEEE80211_F_USEPROT);
|
|
|
|
best_rix = pick_best_rate(sn, rt, size_bin, !mrr);
|
|
if (best_rix >= 0) {
|
|
average_tx_time = sn->stats[size_bin][best_rix].average_tx_time;
|
|
} else {
|
|
average_tx_time = 0;
|
|
}
|
|
/*
|
|
* Limit the time measuring the performance of other tx
|
|
* rates to sample_rate% of the total transmission time.
|
|
*/
|
|
if (sn->sample_tt[size_bin] < average_tx_time * (sn->packets_since_sample[size_bin]*ssc->sample_rate/100)) {
|
|
rix = pick_sample_rate(ssc, sn, rt, size_bin);
|
|
IEEE80211_NOTE(an->an_node.ni_vap, IEEE80211_MSG_RATECTL,
|
|
&an->an_node, "size %u sample rate %d current rate %d",
|
|
bin_to_size(size_bin), RATE(rix),
|
|
RATE(sn->current_rix[size_bin]));
|
|
if (rix != sn->current_rix[size_bin]) {
|
|
sn->current_sample_rix[size_bin] = rix;
|
|
} else {
|
|
sn->current_sample_rix[size_bin] = -1;
|
|
}
|
|
sn->packets_since_sample[size_bin] = 0;
|
|
} else {
|
|
change_rates = 0;
|
|
if (!sn->packets_sent[size_bin] || best_rix == -1) {
|
|
/* no packet has been sent successfully yet */
|
|
for (rix = rt->rateCount-1; rix > 0; rix--) {
|
|
if ((sn->ratemask & (1<<rix)) == 0)
|
|
continue;
|
|
/*
|
|
* Pick the highest rate <= 36 Mbps
|
|
* that hasn't failed.
|
|
*/
|
|
if (DOT11RATE(rix) <= 72 &&
|
|
sn->stats[size_bin][rix].successive_failures == 0) {
|
|
break;
|
|
}
|
|
}
|
|
change_rates = 1;
|
|
best_rix = rix;
|
|
} else if (sn->packets_sent[size_bin] < 20) {
|
|
/* let the bit-rate switch quickly during the first few packets */
|
|
change_rates = 1;
|
|
} else if (ticks - ssc->min_switch > sn->ticks_since_switch[size_bin]) {
|
|
/* min_switch seconds have gone by */
|
|
change_rates = 1;
|
|
} else if (2*average_tx_time < sn->stats[size_bin][sn->current_rix[size_bin]].average_tx_time) {
|
|
/* the current bit-rate is twice as slow as the best one */
|
|
change_rates = 1;
|
|
}
|
|
|
|
sn->packets_since_sample[size_bin]++;
|
|
|
|
if (change_rates) {
|
|
if (best_rix != sn->current_rix[size_bin]) {
|
|
IEEE80211_NOTE(an->an_node.ni_vap,
|
|
IEEE80211_MSG_RATECTL,
|
|
&an->an_node,
|
|
"%s: size %d switch rate %d (%d/%d) -> %d (%d/%d) after %d packets mrr %d",
|
|
__func__,
|
|
bin_to_size(size_bin),
|
|
RATE(sn->current_rix[size_bin]),
|
|
sn->stats[size_bin][sn->current_rix[size_bin]].average_tx_time,
|
|
sn->stats[size_bin][sn->current_rix[size_bin]].perfect_tx_time,
|
|
RATE(best_rix),
|
|
sn->stats[size_bin][best_rix].average_tx_time,
|
|
sn->stats[size_bin][best_rix].perfect_tx_time,
|
|
sn->packets_since_switch[size_bin],
|
|
mrr);
|
|
}
|
|
sn->packets_since_switch[size_bin] = 0;
|
|
sn->current_rix[size_bin] = best_rix;
|
|
sn->ticks_since_switch[size_bin] = ticks;
|
|
/*
|
|
* Set the visible txrate for this node.
|
|
*/
|
|
an->an_node.ni_txrate = (rt->info[best_rix].phy == IEEE80211_T_HT) ? MCS(best_rix) : DOT11RATE(best_rix);
|
|
}
|
|
rix = sn->current_rix[size_bin];
|
|
sn->packets_since_switch[size_bin]++;
|
|
}
|
|
*try0 = mrr ? sn->sched[rix].t0 : ATH_TXMAXTRY;
|
|
done:
|
|
KASSERT(rix >= 0 && rix < rt->rateCount, ("rix is %d", rix));
|
|
|
|
*rix0 = rix;
|
|
*txrate = rt->info[rix].rateCode
|
|
| (shortPreamble ? rt->info[rix].shortPreamble : 0);
|
|
sn->packets_sent[size_bin]++;
|
|
#undef DOT11RATE
|
|
#undef MCS
|
|
#undef RATE
|
|
}
|
|
|
|
/*
|
|
* Get the TX rates. Don't fiddle with short preamble flags for them;
|
|
* the caller can do that.
|
|
*/
|
|
void
|
|
ath_rate_getxtxrates(struct ath_softc *sc, struct ath_node *an,
|
|
uint8_t rix0, uint8_t *rix, uint8_t *try)
|
|
{
|
|
struct sample_node *sn = ATH_NODE_SAMPLE(an);
|
|
const struct txschedule *sched = &sn->sched[rix0];
|
|
|
|
KASSERT(rix0 == sched->r0, ("rix0 (%x) != sched->r0 (%x)!\n", rix0, sched->r0));
|
|
|
|
/* rix[0] = sched->r0; */
|
|
rix[1] = sched->r1;
|
|
rix[2] = sched->r2;
|
|
rix[3] = sched->r3;
|
|
|
|
try[0] = sched->t0;
|
|
try[1] = sched->t1;
|
|
try[2] = sched->t2;
|
|
try[3] = sched->t3;
|
|
}
|
|
|
|
void
|
|
ath_rate_setupxtxdesc(struct ath_softc *sc, struct ath_node *an,
|
|
struct ath_desc *ds, int shortPreamble, u_int8_t rix)
|
|
{
|
|
struct sample_node *sn = ATH_NODE_SAMPLE(an);
|
|
const struct txschedule *sched = &sn->sched[rix];
|
|
const HAL_RATE_TABLE *rt = sc->sc_currates;
|
|
uint8_t rix1, s1code, rix2, s2code, rix3, s3code;
|
|
|
|
/* XXX precalculate short preamble tables */
|
|
rix1 = sched->r1;
|
|
s1code = rt->info[rix1].rateCode
|
|
| (shortPreamble ? rt->info[rix1].shortPreamble : 0);
|
|
rix2 = sched->r2;
|
|
s2code = rt->info[rix2].rateCode
|
|
| (shortPreamble ? rt->info[rix2].shortPreamble : 0);
|
|
rix3 = sched->r3;
|
|
s3code = rt->info[rix3].rateCode
|
|
| (shortPreamble ? rt->info[rix3].shortPreamble : 0);
|
|
ath_hal_setupxtxdesc(sc->sc_ah, ds,
|
|
s1code, sched->t1, /* series 1 */
|
|
s2code, sched->t2, /* series 2 */
|
|
s3code, sched->t3); /* series 3 */
|
|
}
|
|
|
|
static void
|
|
update_stats(struct ath_softc *sc, struct ath_node *an,
|
|
int frame_size,
|
|
int rix0, int tries0,
|
|
int rix1, int tries1,
|
|
int rix2, int tries2,
|
|
int rix3, int tries3,
|
|
int short_tries, int tries, int status)
|
|
{
|
|
struct sample_node *sn = ATH_NODE_SAMPLE(an);
|
|
struct sample_softc *ssc = ATH_SOFTC_SAMPLE(sc);
|
|
const int size_bin = size_to_bin(frame_size);
|
|
const int size = bin_to_size(size_bin);
|
|
int tt, tries_so_far;
|
|
int is_ht40 = (an->an_node.ni_chw == 40);
|
|
|
|
if (!IS_RATE_DEFINED(sn, rix0))
|
|
return;
|
|
tt = calc_usecs_unicast_packet(sc, size, rix0, short_tries,
|
|
MIN(tries0, tries) - 1, is_ht40);
|
|
tries_so_far = tries0;
|
|
|
|
if (tries1 && tries_so_far < tries) {
|
|
if (!IS_RATE_DEFINED(sn, rix1))
|
|
return;
|
|
tt += calc_usecs_unicast_packet(sc, size, rix1, short_tries,
|
|
MIN(tries1 + tries_so_far, tries) - tries_so_far - 1, is_ht40);
|
|
tries_so_far += tries1;
|
|
}
|
|
|
|
if (tries2 && tries_so_far < tries) {
|
|
if (!IS_RATE_DEFINED(sn, rix2))
|
|
return;
|
|
tt += calc_usecs_unicast_packet(sc, size, rix2, short_tries,
|
|
MIN(tries2 + tries_so_far, tries) - tries_so_far - 1, is_ht40);
|
|
tries_so_far += tries2;
|
|
}
|
|
|
|
if (tries3 && tries_so_far < tries) {
|
|
if (!IS_RATE_DEFINED(sn, rix3))
|
|
return;
|
|
tt += calc_usecs_unicast_packet(sc, size, rix3, short_tries,
|
|
MIN(tries3 + tries_so_far, tries) - tries_so_far - 1, is_ht40);
|
|
}
|
|
|
|
if (sn->stats[size_bin][rix0].total_packets < ssc->smoothing_minpackets) {
|
|
/* just average the first few packets */
|
|
int avg_tx = sn->stats[size_bin][rix0].average_tx_time;
|
|
int packets = sn->stats[size_bin][rix0].total_packets;
|
|
sn->stats[size_bin][rix0].average_tx_time = (tt+(avg_tx*packets))/(packets+1);
|
|
} else {
|
|
/* use a ewma */
|
|
sn->stats[size_bin][rix0].average_tx_time =
|
|
((sn->stats[size_bin][rix0].average_tx_time * ssc->smoothing_rate) +
|
|
(tt * (100 - ssc->smoothing_rate))) / 100;
|
|
}
|
|
|
|
if (status != 0) {
|
|
int y;
|
|
sn->stats[size_bin][rix0].successive_failures++;
|
|
for (y = size_bin+1; y < NUM_PACKET_SIZE_BINS; y++) {
|
|
/*
|
|
* Also say larger packets failed since we
|
|
* assume if a small packet fails at a
|
|
* bit-rate then a larger one will also.
|
|
*/
|
|
sn->stats[y][rix0].successive_failures++;
|
|
sn->stats[y][rix0].last_tx = ticks;
|
|
sn->stats[y][rix0].tries += tries;
|
|
sn->stats[y][rix0].total_packets++;
|
|
}
|
|
} else {
|
|
sn->stats[size_bin][rix0].packets_acked++;
|
|
sn->stats[size_bin][rix0].successive_failures = 0;
|
|
}
|
|
sn->stats[size_bin][rix0].tries += tries;
|
|
sn->stats[size_bin][rix0].last_tx = ticks;
|
|
sn->stats[size_bin][rix0].total_packets++;
|
|
|
|
if (rix0 == sn->current_sample_rix[size_bin]) {
|
|
IEEE80211_NOTE(an->an_node.ni_vap, IEEE80211_MSG_RATECTL,
|
|
&an->an_node,
|
|
"%s: size %d %s sample rate %d tries (%d/%d) tt %d avg_tt (%d/%d)",
|
|
__func__,
|
|
size,
|
|
status ? "FAIL" : "OK",
|
|
rix0, short_tries, tries, tt,
|
|
sn->stats[size_bin][rix0].average_tx_time,
|
|
sn->stats[size_bin][rix0].perfect_tx_time);
|
|
sn->sample_tt[size_bin] = tt;
|
|
sn->current_sample_rix[size_bin] = -1;
|
|
}
|
|
}
|
|
|
|
static void
|
|
badrate(struct ifnet *ifp, int series, int hwrate, int tries, int status)
|
|
{
|
|
if_printf(ifp, "bad series%d hwrate 0x%x, tries %u ts_status 0x%x\n",
|
|
series, hwrate, tries, status);
|
|
}
|
|
|
|
void
|
|
ath_rate_tx_complete(struct ath_softc *sc, struct ath_node *an,
|
|
const struct ath_buf *bf)
|
|
{
|
|
struct ifnet *ifp = sc->sc_ifp;
|
|
struct ieee80211com *ic = ifp->if_l2com;
|
|
struct sample_node *sn = ATH_NODE_SAMPLE(an);
|
|
const struct ath_tx_status *ts = &bf->bf_status.ds_txstat;
|
|
const struct ath_desc *ds0 = &bf->bf_desc[0];
|
|
int final_rix, short_tries, long_tries, frame_size;
|
|
const HAL_RATE_TABLE *rt = sc->sc_currates;
|
|
int mrr;
|
|
|
|
final_rix = rt->rateCodeToIndex[ts->ts_rate];
|
|
short_tries = ts->ts_shortretry;
|
|
long_tries = ts->ts_longretry + 1;
|
|
frame_size = ds0->ds_ctl0 & 0x0fff; /* low-order 12 bits of ds_ctl0 */
|
|
if (frame_size == 0) /* NB: should not happen */
|
|
frame_size = 1500;
|
|
|
|
if (sn->ratemask == 0) {
|
|
IEEE80211_NOTE(an->an_node.ni_vap, IEEE80211_MSG_RATECTL,
|
|
&an->an_node,
|
|
"%s: size %d %s rate/try %d/%d no rates yet",
|
|
__func__,
|
|
bin_to_size(size_to_bin(frame_size)),
|
|
ts->ts_status ? "FAIL" : "OK",
|
|
short_tries, long_tries);
|
|
return;
|
|
}
|
|
mrr = sc->sc_mrretry && !(ic->ic_flags & IEEE80211_F_USEPROT);
|
|
if (!mrr || ts->ts_finaltsi == 0) {
|
|
if (!IS_RATE_DEFINED(sn, final_rix)) {
|
|
badrate(ifp, 0, ts->ts_rate, long_tries, ts->ts_status);
|
|
return;
|
|
}
|
|
/*
|
|
* Only one rate was used; optimize work.
|
|
*/
|
|
IEEE80211_NOTE(an->an_node.ni_vap, IEEE80211_MSG_RATECTL,
|
|
&an->an_node, "%s: size %d (%d bytes) %s rate/try %d %s/%d/%d",
|
|
__func__,
|
|
bin_to_size(size_to_bin(frame_size)),
|
|
frame_size,
|
|
ts->ts_status ? "FAIL" : "OK",
|
|
dot11rate(rt, final_rix), dot11rate_label(rt, final_rix), short_tries, long_tries);
|
|
update_stats(sc, an, frame_size,
|
|
final_rix, long_tries,
|
|
0, 0,
|
|
0, 0,
|
|
0, 0,
|
|
short_tries, long_tries, ts->ts_status);
|
|
} else {
|
|
int hwrates[4], tries[4], rix[4];
|
|
int finalTSIdx = ts->ts_finaltsi;
|
|
int i;
|
|
|
|
/*
|
|
* Process intermediate rates that failed.
|
|
*/
|
|
ath_hal_gettxcompletionrates(sc->sc_ah, ds0, hwrates, tries);
|
|
|
|
for (i = 0; i < 4; i++) {
|
|
rix[i] = rt->rateCodeToIndex[hwrates[i]];
|
|
}
|
|
|
|
IEEE80211_NOTE(an->an_node.ni_vap, IEEE80211_MSG_RATECTL,
|
|
&an->an_node,
|
|
"%s: size %d (%d bytes) finaltsidx %d tries %d %s rate/try [%d %s/%d %d %s/%d %d %s/%d %d %s/%d]",
|
|
__func__,
|
|
bin_to_size(size_to_bin(frame_size)),
|
|
frame_size,
|
|
finalTSIdx,
|
|
long_tries,
|
|
ts->ts_status ? "FAIL" : "OK",
|
|
dot11rate(rt, rix[0]), dot11rate_label(rt, rix[0]), tries[0],
|
|
dot11rate(rt, rix[1]), dot11rate_label(rt, rix[1]), tries[1],
|
|
dot11rate(rt, rix[2]), dot11rate_label(rt, rix[2]), tries[2],
|
|
dot11rate(rt, rix[3]), dot11rate_label(rt, rix[3]), tries[3]);
|
|
|
|
for (i = 0; i < 4; i++) {
|
|
if (tries[i] && !IS_RATE_DEFINED(sn, rix[i]))
|
|
badrate(ifp, 0, hwrates[i], tries[i], ts->ts_status);
|
|
}
|
|
|
|
/*
|
|
* NB: series > 0 are not penalized for failure
|
|
* based on the try counts under the assumption
|
|
* that losses are often bursty and since we
|
|
* sample higher rates 1 try at a time doing so
|
|
* may unfairly penalize them.
|
|
*/
|
|
if (tries[0]) {
|
|
update_stats(sc, an, frame_size,
|
|
rix[0], tries[0],
|
|
rix[1], tries[1],
|
|
rix[2], tries[2],
|
|
rix[3], tries[3],
|
|
short_tries, long_tries,
|
|
long_tries > tries[0]);
|
|
long_tries -= tries[0];
|
|
}
|
|
|
|
if (tries[1] && finalTSIdx > 0) {
|
|
update_stats(sc, an, frame_size,
|
|
rix[1], tries[1],
|
|
rix[2], tries[2],
|
|
rix[3], tries[3],
|
|
0, 0,
|
|
short_tries, long_tries,
|
|
ts->ts_status);
|
|
long_tries -= tries[1];
|
|
}
|
|
|
|
if (tries[2] && finalTSIdx > 1) {
|
|
update_stats(sc, an, frame_size,
|
|
rix[2], tries[2],
|
|
rix[3], tries[3],
|
|
0, 0,
|
|
0, 0,
|
|
short_tries, long_tries,
|
|
ts->ts_status);
|
|
long_tries -= tries[2];
|
|
}
|
|
|
|
if (tries[3] && finalTSIdx > 2) {
|
|
update_stats(sc, an, frame_size,
|
|
rix[3], tries[3],
|
|
0, 0,
|
|
0, 0,
|
|
0, 0,
|
|
short_tries, long_tries,
|
|
ts->ts_status);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
ath_rate_newassoc(struct ath_softc *sc, struct ath_node *an, int isnew)
|
|
{
|
|
if (isnew)
|
|
ath_rate_ctl_reset(sc, &an->an_node);
|
|
}
|
|
|
|
static const struct txschedule *mrr_schedules[IEEE80211_MODE_MAX+2] = {
|
|
NULL, /* IEEE80211_MODE_AUTO */
|
|
series_11a, /* IEEE80211_MODE_11A */
|
|
series_11g, /* IEEE80211_MODE_11B */
|
|
series_11g, /* IEEE80211_MODE_11G */
|
|
NULL, /* IEEE80211_MODE_FH */
|
|
series_11a, /* IEEE80211_MODE_TURBO_A */
|
|
series_11g, /* IEEE80211_MODE_TURBO_G */
|
|
series_11a, /* IEEE80211_MODE_STURBO_A */
|
|
series_11na, /* IEEE80211_MODE_11NA */
|
|
series_11ng, /* IEEE80211_MODE_11NG */
|
|
series_half, /* IEEE80211_MODE_HALF */
|
|
series_quarter, /* IEEE80211_MODE_QUARTER */
|
|
};
|
|
|
|
/*
|
|
* Initialize the tables for a node.
|
|
*/
|
|
static void
|
|
ath_rate_ctl_reset(struct ath_softc *sc, struct ieee80211_node *ni)
|
|
{
|
|
#define RATE(_ix) (ni->ni_rates.rs_rates[(_ix)] & IEEE80211_RATE_VAL)
|
|
#define DOT11RATE(_ix) (rt->info[(_ix)].dot11Rate & IEEE80211_RATE_VAL)
|
|
#define MCS(_ix) (ni->ni_htrates.rs_rates[_ix] | IEEE80211_RATE_MCS)
|
|
struct ath_node *an = ATH_NODE(ni);
|
|
struct sample_node *sn = ATH_NODE_SAMPLE(an);
|
|
const HAL_RATE_TABLE *rt = sc->sc_currates;
|
|
int x, y, rix;
|
|
|
|
KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
|
|
|
|
KASSERT(sc->sc_curmode < IEEE80211_MODE_MAX+2,
|
|
("curmode %u", sc->sc_curmode));
|
|
sn->sched = mrr_schedules[sc->sc_curmode];
|
|
KASSERT(sn->sched != NULL,
|
|
("no mrr schedule for mode %u", sc->sc_curmode));
|
|
|
|
sn->static_rix = -1;
|
|
ath_rate_update_static_rix(sc, ni);
|
|
|
|
/*
|
|
* Construct a bitmask of usable rates. This has all
|
|
* negotiated rates minus those marked by the hal as
|
|
* to be ignored for doing rate control.
|
|
*/
|
|
sn->ratemask = 0;
|
|
/* MCS rates */
|
|
if (ni->ni_flags & IEEE80211_NODE_HT) {
|
|
for (x = 0; x < ni->ni_htrates.rs_nrates; x++) {
|
|
rix = sc->sc_rixmap[MCS(x)];
|
|
if (rix == 0xff)
|
|
continue;
|
|
/* skip rates marked broken by hal */
|
|
if (!rt->info[rix].valid)
|
|
continue;
|
|
KASSERT(rix < SAMPLE_MAXRATES,
|
|
("mcs %u has rix %d", MCS(x), rix));
|
|
sn->ratemask |= 1<<rix;
|
|
}
|
|
}
|
|
|
|
/* Legacy rates */
|
|
for (x = 0; x < ni->ni_rates.rs_nrates; x++) {
|
|
rix = sc->sc_rixmap[RATE(x)];
|
|
if (rix == 0xff)
|
|
continue;
|
|
/* skip rates marked broken by hal */
|
|
if (!rt->info[rix].valid)
|
|
continue;
|
|
KASSERT(rix < SAMPLE_MAXRATES,
|
|
("rate %u has rix %d", RATE(x), rix));
|
|
sn->ratemask |= 1<<rix;
|
|
}
|
|
#ifdef IEEE80211_DEBUG
|
|
if (ieee80211_msg(ni->ni_vap, IEEE80211_MSG_RATECTL)) {
|
|
uint32_t mask;
|
|
|
|
ieee80211_note(ni->ni_vap, "[%6D] %s: size 1600 rate/tt",
|
|
ni->ni_macaddr, ":", __func__);
|
|
for (mask = sn->ratemask, rix = 0; mask != 0; mask >>= 1, rix++) {
|
|
if ((mask & 1) == 0)
|
|
continue;
|
|
printf(" %d %s/%d", dot11rate(rt, rix), dot11rate_label(rt, rix),
|
|
calc_usecs_unicast_packet(sc, 1600, rix, 0,0,
|
|
(ni->ni_chw == 40)));
|
|
}
|
|
printf("\n");
|
|
}
|
|
#endif
|
|
for (y = 0; y < NUM_PACKET_SIZE_BINS; y++) {
|
|
int size = bin_to_size(y);
|
|
uint32_t mask;
|
|
|
|
sn->packets_sent[y] = 0;
|
|
sn->current_sample_rix[y] = -1;
|
|
sn->last_sample_rix[y] = 0;
|
|
/* XXX start with first valid rate */
|
|
sn->current_rix[y] = ffs(sn->ratemask)-1;
|
|
|
|
/*
|
|
* Initialize the statistics buckets; these are
|
|
* indexed by the rate code index.
|
|
*/
|
|
for (rix = 0, mask = sn->ratemask; mask != 0; rix++, mask >>= 1) {
|
|
if ((mask & 1) == 0) /* not a valid rate */
|
|
continue;
|
|
sn->stats[y][rix].successive_failures = 0;
|
|
sn->stats[y][rix].tries = 0;
|
|
sn->stats[y][rix].total_packets = 0;
|
|
sn->stats[y][rix].packets_acked = 0;
|
|
sn->stats[y][rix].last_tx = 0;
|
|
|
|
sn->stats[y][rix].perfect_tx_time =
|
|
calc_usecs_unicast_packet(sc, size, rix, 0, 0,
|
|
(ni->ni_chw == 40));
|
|
sn->stats[y][rix].average_tx_time =
|
|
sn->stats[y][rix].perfect_tx_time;
|
|
}
|
|
}
|
|
#if 0
|
|
/* XXX 0, num_rates-1 are wrong */
|
|
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
|
|
"%s: %d rates %d%sMbps (%dus)- %d%sMbps (%dus)", __func__,
|
|
sn->num_rates,
|
|
DOT11RATE(0)/2, DOT11RATE(0) % 1 ? ".5" : "",
|
|
sn->stats[1][0].perfect_tx_time,
|
|
DOT11RATE(sn->num_rates-1)/2, DOT11RATE(sn->num_rates-1) % 1 ? ".5" : "",
|
|
sn->stats[1][sn->num_rates-1].perfect_tx_time
|
|
);
|
|
#endif
|
|
/* set the visible bit-rate */
|
|
if (sn->static_rix != -1)
|
|
ni->ni_txrate = DOT11RATE(sn->static_rix);
|
|
else
|
|
ni->ni_txrate = RATE(0);
|
|
#undef RATE
|
|
#undef DOT11RATE
|
|
}
|
|
|
|
static void
|
|
sample_stats(void *arg, struct ieee80211_node *ni)
|
|
{
|
|
struct ath_softc *sc = arg;
|
|
const HAL_RATE_TABLE *rt = sc->sc_currates;
|
|
struct sample_node *sn = ATH_NODE_SAMPLE(ATH_NODE(ni));
|
|
uint32_t mask;
|
|
int rix, y;
|
|
|
|
printf("\n[%s] refcnt %d static_rix %d ratemask 0x%x\n",
|
|
ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni),
|
|
sn->static_rix, sn->ratemask);
|
|
for (y = 0; y < NUM_PACKET_SIZE_BINS; y++) {
|
|
printf("[%4u] cur rix %d (%d %s) since switch: packets %d ticks %u\n",
|
|
bin_to_size(y), sn->current_rix[y],
|
|
dot11rate(rt, sn->current_rix[y]),
|
|
dot11rate_label(rt, sn->current_rix[y]),
|
|
sn->packets_since_switch[y], sn->ticks_since_switch[y]);
|
|
printf("[%4u] last sample %d cur sample %d packets sent %d\n",
|
|
bin_to_size(y), sn->last_sample_rix[y],
|
|
sn->current_sample_rix[y], sn->packets_sent[y]);
|
|
printf("[%4u] packets since sample %d sample tt %u\n",
|
|
bin_to_size(y), sn->packets_since_sample[y],
|
|
sn->sample_tt[y]);
|
|
}
|
|
for (mask = sn->ratemask, rix = 0; mask != 0; mask >>= 1, rix++) {
|
|
if ((mask & 1) == 0)
|
|
continue;
|
|
for (y = 0; y < NUM_PACKET_SIZE_BINS; y++) {
|
|
if (sn->stats[y][rix].total_packets == 0)
|
|
continue;
|
|
printf("[%2u %s:%4u] %8d:%-8d (%3d%%) T %8d F %4d avg %5u last %u\n",
|
|
dot11rate(rt, rix), dot11rate_label(rt, rix),
|
|
bin_to_size(y),
|
|
sn->stats[y][rix].total_packets,
|
|
sn->stats[y][rix].packets_acked,
|
|
(100*sn->stats[y][rix].packets_acked)/sn->stats[y][rix].total_packets,
|
|
sn->stats[y][rix].tries,
|
|
sn->stats[y][rix].successive_failures,
|
|
sn->stats[y][rix].average_tx_time,
|
|
ticks - sn->stats[y][rix].last_tx);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int
|
|
ath_rate_sysctl_stats(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct ath_softc *sc = arg1;
|
|
struct ifnet *ifp = sc->sc_ifp;
|
|
struct ieee80211com *ic = ifp->if_l2com;
|
|
int error, v;
|
|
|
|
v = 0;
|
|
error = sysctl_handle_int(oidp, &v, 0, req);
|
|
if (error || !req->newptr)
|
|
return error;
|
|
ieee80211_iterate_nodes(&ic->ic_sta, sample_stats, sc);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ath_rate_sysctl_smoothing_rate(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct sample_softc *ssc = arg1;
|
|
int rate, error;
|
|
|
|
rate = ssc->smoothing_rate;
|
|
error = sysctl_handle_int(oidp, &rate, 0, req);
|
|
if (error || !req->newptr)
|
|
return error;
|
|
if (!(0 <= rate && rate < 100))
|
|
return EINVAL;
|
|
ssc->smoothing_rate = rate;
|
|
ssc->smoothing_minpackets = 100 / (100 - rate);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ath_rate_sysctl_sample_rate(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct sample_softc *ssc = arg1;
|
|
int rate, error;
|
|
|
|
rate = ssc->sample_rate;
|
|
error = sysctl_handle_int(oidp, &rate, 0, req);
|
|
if (error || !req->newptr)
|
|
return error;
|
|
if (!(2 <= rate && rate <= 100))
|
|
return EINVAL;
|
|
ssc->sample_rate = rate;
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
ath_rate_sysctlattach(struct ath_softc *sc, struct sample_softc *ssc)
|
|
{
|
|
struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(sc->sc_dev);
|
|
struct sysctl_oid *tree = device_get_sysctl_tree(sc->sc_dev);
|
|
|
|
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
|
|
"smoothing_rate", CTLTYPE_INT | CTLFLAG_RW, ssc, 0,
|
|
ath_rate_sysctl_smoothing_rate, "I",
|
|
"sample: smoothing rate for avg tx time (%%)");
|
|
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
|
|
"sample_rate", CTLTYPE_INT | CTLFLAG_RW, ssc, 0,
|
|
ath_rate_sysctl_sample_rate, "I",
|
|
"sample: percent air time devoted to sampling new rates (%%)");
|
|
/* XXX max_successive_failures, stale_failure_timeout, min_switch */
|
|
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
|
|
"sample_stats", CTLTYPE_INT | CTLFLAG_RW, sc, 0,
|
|
ath_rate_sysctl_stats, "I", "sample: print statistics");
|
|
}
|
|
|
|
struct ath_ratectrl *
|
|
ath_rate_attach(struct ath_softc *sc)
|
|
{
|
|
struct sample_softc *ssc;
|
|
|
|
ssc = malloc(sizeof(struct sample_softc), M_DEVBUF, M_NOWAIT|M_ZERO);
|
|
if (ssc == NULL)
|
|
return NULL;
|
|
ssc->arc.arc_space = sizeof(struct sample_node);
|
|
ssc->smoothing_rate = 95; /* ewma percentage ([0..99]) */
|
|
ssc->smoothing_minpackets = 100 / (100 - ssc->smoothing_rate);
|
|
ssc->sample_rate = 10; /* %time to try diff tx rates */
|
|
ssc->max_successive_failures = 3; /* threshold for rate sampling*/
|
|
ssc->stale_failure_timeout = 10 * hz; /* 10 seconds */
|
|
ssc->min_switch = hz; /* 1 second */
|
|
ath_rate_sysctlattach(sc, ssc);
|
|
return &ssc->arc;
|
|
}
|
|
|
|
void
|
|
ath_rate_detach(struct ath_ratectrl *arc)
|
|
{
|
|
struct sample_softc *ssc = (struct sample_softc *) arc;
|
|
|
|
free(ssc, M_DEVBUF);
|
|
}
|