350 lines
10 KiB
C
350 lines
10 KiB
C
/* $FreeBSD$ */
|
|
/* $NetBSD: ieee80211_rssadapt.c,v 1.9 2005/02/26 22:45:09 perry Exp $ */
|
|
/*-
|
|
* Copyright (c) 2010 Rui Paulo <rpaulo@FreeBSD.org>
|
|
* Copyright (c) 2003, 2004 David Young. 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.
|
|
* 2. Redistributions in binary form must reproduce the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer in the documentation and/or other materials provided
|
|
* with the distribution.
|
|
* 3. The name of David Young may not be used to endorse or promote
|
|
* products derived from this software without specific prior
|
|
* written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY David Young ``AS IS'' AND ANY
|
|
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
|
|
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
|
|
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL David
|
|
* Young BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 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 DAMAGE.
|
|
*/
|
|
#include "opt_wlan.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/module.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/sysctl.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/if_media.h>
|
|
|
|
#include <net80211/ieee80211_var.h>
|
|
#include <net80211/ieee80211_rssadapt.h>
|
|
#include <net80211/ieee80211_ratectl.h>
|
|
|
|
struct rssadapt_expavgctl {
|
|
/* RSS threshold decay. */
|
|
u_int rc_decay_denom;
|
|
u_int rc_decay_old;
|
|
/* RSS threshold update. */
|
|
u_int rc_thresh_denom;
|
|
u_int rc_thresh_old;
|
|
/* RSS average update. */
|
|
u_int rc_avgrssi_denom;
|
|
u_int rc_avgrssi_old;
|
|
};
|
|
|
|
static struct rssadapt_expavgctl master_expavgctl = {
|
|
.rc_decay_denom = 16,
|
|
.rc_decay_old = 15,
|
|
.rc_thresh_denom = 8,
|
|
.rc_thresh_old = 4,
|
|
.rc_avgrssi_denom = 8,
|
|
.rc_avgrssi_old = 4
|
|
};
|
|
|
|
#ifdef interpolate
|
|
#undef interpolate
|
|
#endif
|
|
#define interpolate(parm, old, new) ((parm##_old * (old) + \
|
|
(parm##_denom - parm##_old) * (new)) / \
|
|
parm##_denom)
|
|
|
|
static void rssadapt_setinterval(const struct ieee80211vap *, int);
|
|
static void rssadapt_init(struct ieee80211vap *);
|
|
static void rssadapt_deinit(struct ieee80211vap *);
|
|
static void rssadapt_updatestats(struct ieee80211_rssadapt_node *);
|
|
static void rssadapt_node_init(struct ieee80211_node *);
|
|
static void rssadapt_node_deinit(struct ieee80211_node *);
|
|
static int rssadapt_rate(struct ieee80211_node *, void *, uint32_t);
|
|
static void rssadapt_lower_rate(struct ieee80211_rssadapt_node *, int, int);
|
|
static void rssadapt_raise_rate(struct ieee80211_rssadapt_node *,
|
|
int, int);
|
|
static void rssadapt_tx_complete(const struct ieee80211vap *,
|
|
const struct ieee80211_node *, int,
|
|
void *, void *);
|
|
static void rssadapt_sysctlattach(struct ieee80211vap *,
|
|
struct sysctl_ctx_list *, struct sysctl_oid *);
|
|
|
|
/* number of references from net80211 layer */
|
|
static int nrefs = 0;
|
|
|
|
static const struct ieee80211_ratectl rssadapt = {
|
|
.ir_name = "rssadapt",
|
|
.ir_attach = NULL,
|
|
.ir_detach = NULL,
|
|
.ir_init = rssadapt_init,
|
|
.ir_deinit = rssadapt_deinit,
|
|
.ir_node_init = rssadapt_node_init,
|
|
.ir_node_deinit = rssadapt_node_deinit,
|
|
.ir_rate = rssadapt_rate,
|
|
.ir_tx_complete = rssadapt_tx_complete,
|
|
.ir_tx_update = NULL,
|
|
.ir_setinterval = rssadapt_setinterval,
|
|
};
|
|
IEEE80211_RATECTL_MODULE(rssadapt, 1);
|
|
IEEE80211_RATECTL_ALG(rssadapt, IEEE80211_RATECTL_RSSADAPT, rssadapt);
|
|
|
|
static void
|
|
rssadapt_setinterval(const struct ieee80211vap *vap, int msecs)
|
|
{
|
|
struct ieee80211_rssadapt *rs = vap->iv_rs;
|
|
int t;
|
|
|
|
if (msecs < 100)
|
|
msecs = 100;
|
|
t = msecs_to_ticks(msecs);
|
|
rs->interval = (t < 1) ? 1 : t;
|
|
}
|
|
|
|
static void
|
|
rssadapt_init(struct ieee80211vap *vap)
|
|
{
|
|
struct ieee80211_rssadapt *rs;
|
|
|
|
KASSERT(vap->iv_rs == NULL, ("%s: iv_rs already initialized",
|
|
__func__));
|
|
|
|
vap->iv_rs = rs = malloc(sizeof(struct ieee80211_rssadapt),
|
|
M_80211_RATECTL, M_NOWAIT|M_ZERO);
|
|
if (rs == NULL) {
|
|
if_printf(vap->iv_ifp, "couldn't alloc ratectl structure\n");
|
|
return;
|
|
}
|
|
rs->vap = vap;
|
|
rssadapt_setinterval(vap, 500 /* msecs */);
|
|
rssadapt_sysctlattach(vap, vap->iv_sysctl, vap->iv_oid);
|
|
}
|
|
|
|
static void
|
|
rssadapt_deinit(struct ieee80211vap *vap)
|
|
{
|
|
free(vap->iv_rs, M_80211_RATECTL);
|
|
}
|
|
|
|
static void
|
|
rssadapt_updatestats(struct ieee80211_rssadapt_node *ra)
|
|
{
|
|
long interval;
|
|
|
|
ra->ra_pktrate = (ra->ra_pktrate + 10*(ra->ra_nfail + ra->ra_nok))/2;
|
|
ra->ra_nfail = ra->ra_nok = 0;
|
|
|
|
/*
|
|
* A node is eligible for its rate to be raised every 1/10 to 10
|
|
* seconds, more eligible in proportion to recent packet rates.
|
|
*/
|
|
interval = MAX(10*1000, 10*1000 / MAX(1, 10 * ra->ra_pktrate));
|
|
ra->ra_raise_interval = msecs_to_ticks(interval);
|
|
}
|
|
|
|
static void
|
|
rssadapt_node_init(struct ieee80211_node *ni)
|
|
{
|
|
struct ieee80211_rssadapt_node *ra;
|
|
struct ieee80211vap *vap = ni->ni_vap;
|
|
struct ieee80211_rssadapt *rsa = vap->iv_rs;
|
|
const struct ieee80211_rateset *rs = &ni->ni_rates;
|
|
|
|
if (ni->ni_rctls == NULL) {
|
|
ni->ni_rctls = ra =
|
|
malloc(sizeof(struct ieee80211_rssadapt_node),
|
|
M_80211_RATECTL, M_NOWAIT|M_ZERO);
|
|
if (ra == NULL) {
|
|
if_printf(vap->iv_ifp, "couldn't alloc per-node ratectl "
|
|
"structure\n");
|
|
return;
|
|
}
|
|
} else
|
|
ra = ni->ni_rctls;
|
|
ra->ra_rs = rsa;
|
|
ra->ra_rates = *rs;
|
|
rssadapt_updatestats(ra);
|
|
|
|
/* pick initial rate */
|
|
for (ra->ra_rix = rs->rs_nrates - 1;
|
|
ra->ra_rix > 0 && (rs->rs_rates[ra->ra_rix] & IEEE80211_RATE_VAL) > 72;
|
|
ra->ra_rix--)
|
|
;
|
|
ni->ni_txrate = rs->rs_rates[ra->ra_rix] & IEEE80211_RATE_VAL;
|
|
ra->ra_ticks = ticks;
|
|
|
|
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
|
|
"RSSADAPT initial rate %d", ni->ni_txrate);
|
|
}
|
|
|
|
static void
|
|
rssadapt_node_deinit(struct ieee80211_node *ni)
|
|
{
|
|
|
|
free(ni->ni_rctls, M_80211_RATECTL);
|
|
}
|
|
|
|
static __inline int
|
|
bucket(int pktlen)
|
|
{
|
|
int i, top, thridx;
|
|
|
|
for (i = 0, top = IEEE80211_RSSADAPT_BKT0;
|
|
i < IEEE80211_RSSADAPT_BKTS;
|
|
i++, top <<= IEEE80211_RSSADAPT_BKTPOWER) {
|
|
thridx = i;
|
|
if (pktlen <= top)
|
|
break;
|
|
}
|
|
return thridx;
|
|
}
|
|
|
|
static int
|
|
rssadapt_rate(struct ieee80211_node *ni, void *arg __unused, uint32_t iarg)
|
|
{
|
|
struct ieee80211_rssadapt_node *ra = ni->ni_rctls;
|
|
u_int pktlen = iarg;
|
|
const struct ieee80211_rateset *rs = &ra->ra_rates;
|
|
uint16_t (*thrs)[IEEE80211_RATE_SIZE];
|
|
int rix, rssi;
|
|
|
|
if ((ticks - ra->ra_ticks) > ra->ra_rs->interval) {
|
|
rssadapt_updatestats(ra);
|
|
ra->ra_ticks = ticks;
|
|
}
|
|
|
|
thrs = &ra->ra_rate_thresh[bucket(pktlen)];
|
|
|
|
/* XXX this is average rssi, should be using last value */
|
|
rssi = ni->ni_ic->ic_node_getrssi(ni);
|
|
for (rix = rs->rs_nrates-1; rix >= 0; rix--)
|
|
if ((*thrs)[rix] < (rssi << 8))
|
|
break;
|
|
if (rix != ra->ra_rix) {
|
|
/* update public rate */
|
|
ni->ni_txrate = ni->ni_rates.rs_rates[rix] & IEEE80211_RATE_VAL;
|
|
ra->ra_rix = rix;
|
|
|
|
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
|
|
"RSSADAPT new rate %d (pktlen %d rssi %d)",
|
|
ni->ni_txrate, pktlen, rssi);
|
|
}
|
|
return rix;
|
|
}
|
|
|
|
/*
|
|
* Adapt the data rate to suit the conditions. When a transmitted
|
|
* packet is dropped after RAL_RSSADAPT_RETRY_LIMIT retransmissions,
|
|
* raise the RSS threshold for transmitting packets of similar length at
|
|
* the same data rate.
|
|
*/
|
|
static void
|
|
rssadapt_lower_rate(struct ieee80211_rssadapt_node *ra, int pktlen, int rssi)
|
|
{
|
|
uint16_t last_thr;
|
|
uint16_t (*thrs)[IEEE80211_RATE_SIZE];
|
|
u_int rix;
|
|
|
|
thrs = &ra->ra_rate_thresh[bucket(pktlen)];
|
|
|
|
rix = ra->ra_rix;
|
|
last_thr = (*thrs)[rix];
|
|
(*thrs)[rix] = interpolate(master_expavgctl.rc_thresh,
|
|
last_thr, (rssi << 8));
|
|
|
|
IEEE80211_DPRINTF(ra->ra_rs->vap, IEEE80211_MSG_RATECTL,
|
|
"RSSADAPT lower threshold for rate %d (last_thr %d new thr %d rssi %d)\n",
|
|
ra->ra_rates.rs_rates[rix + 1] & IEEE80211_RATE_VAL,
|
|
last_thr, (*thrs)[rix], rssi);
|
|
}
|
|
|
|
static void
|
|
rssadapt_raise_rate(struct ieee80211_rssadapt_node *ra, int pktlen, int rssi)
|
|
{
|
|
uint16_t (*thrs)[IEEE80211_RATE_SIZE];
|
|
uint16_t newthr, oldthr;
|
|
int rix;
|
|
|
|
thrs = &ra->ra_rate_thresh[bucket(pktlen)];
|
|
|
|
rix = ra->ra_rix;
|
|
if ((*thrs)[rix + 1] > (*thrs)[rix]) {
|
|
oldthr = (*thrs)[rix + 1];
|
|
if ((*thrs)[rix] == 0)
|
|
newthr = (rssi << 8);
|
|
else
|
|
newthr = (*thrs)[rix];
|
|
(*thrs)[rix + 1] = interpolate(master_expavgctl.rc_decay,
|
|
oldthr, newthr);
|
|
|
|
IEEE80211_DPRINTF(ra->ra_rs->vap, IEEE80211_MSG_RATECTL,
|
|
"RSSADAPT raise threshold for rate %d (oldthr %d newthr %d rssi %d)\n",
|
|
ra->ra_rates.rs_rates[rix + 1] & IEEE80211_RATE_VAL,
|
|
oldthr, newthr, rssi);
|
|
|
|
ra->ra_last_raise = ticks;
|
|
}
|
|
}
|
|
|
|
static void
|
|
rssadapt_tx_complete(const struct ieee80211vap *vap,
|
|
const struct ieee80211_node *ni, int success, void *arg1, void *arg2)
|
|
{
|
|
struct ieee80211_rssadapt_node *ra = ni->ni_rctls;
|
|
int pktlen = *(int *)arg1, rssi = *(int *)arg2;
|
|
|
|
if (success) {
|
|
ra->ra_nok++;
|
|
if ((ra->ra_rix + 1) < ra->ra_rates.rs_nrates &&
|
|
(ticks - ra->ra_last_raise) >= ra->ra_raise_interval)
|
|
rssadapt_raise_rate(ra, pktlen, rssi);
|
|
} else {
|
|
ra->ra_nfail++;
|
|
rssadapt_lower_rate(ra, pktlen, rssi);
|
|
}
|
|
}
|
|
|
|
static int
|
|
rssadapt_sysctl_interval(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct ieee80211vap *vap = arg1;
|
|
struct ieee80211_rssadapt *rs = vap->iv_rs;
|
|
int msecs = ticks_to_msecs(rs->interval);
|
|
int error;
|
|
|
|
error = sysctl_handle_int(oidp, &msecs, 0, req);
|
|
if (error || !req->newptr)
|
|
return error;
|
|
rssadapt_setinterval(vap, msecs);
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
rssadapt_sysctlattach(struct ieee80211vap *vap,
|
|
struct sysctl_ctx_list *ctx, struct sysctl_oid *tree)
|
|
{
|
|
|
|
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
|
|
"rssadapt_rate_interval", CTLTYPE_INT | CTLFLAG_RW, vap,
|
|
0, rssadapt_sysctl_interval, "I", "rssadapt operation interval (ms)");
|
|
}
|