1b86b779b2
the assumption that ath_softc doesn't change size based on build time configuration. I picked up on this because suddenly radar stuff didn't work; and although the ath_dfs code was setting sc_dodfs=1, the main ath driver saw sc_dodfs=0. So for now, include opt_ath.h in driver source files. This seems like the sane thing to do anyway. I'll have to do a pass over the code at some later stage and turn the radiotap TX/RX structs into malloc'ed memory, rather than in-line inside of ath_softc. I'd rather like to keep ath_softc the same layout regardless of configuration parameters. Pointy hat to: adrian
431 lines
13 KiB
C
431 lines
13 KiB
C
/*-
|
|
* Copyright (c) 2002-2007 Sam Leffler, Errno Consulting
|
|
* 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.
|
|
*
|
|
* 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("$FreeBSD$");
|
|
|
|
/*
|
|
* Atsushi Onoe's rate control algorithm.
|
|
*/
|
|
#include "opt_ath.h"
|
|
#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/onoe/onoe.h>
|
|
#include <dev/ath/ath_hal/ah_desc.h>
|
|
|
|
/*
|
|
* Default parameters for the rate control algorithm. These are
|
|
* all tunable with sysctls. The rate controller runs periodically
|
|
* (each ath_rateinterval ms) analyzing transmit statistics for each
|
|
* neighbor/station (when operating in station mode this is only the AP).
|
|
* If transmits look to be working well over a sampling period then
|
|
* it gives a "raise rate credit". If transmits look to not be working
|
|
* well than it deducts a credit. If the credits cross a threshold then
|
|
* the transmit rate is raised. Various error conditions force the
|
|
* the transmit rate to be dropped.
|
|
*
|
|
* The decision to issue/deduct a credit is based on the errors and
|
|
* retries accumulated over the sampling period. ath_rate_raise defines
|
|
* the percent of retransmits for which a credit is issued/deducted.
|
|
* ath_rate_raise_threshold defines the threshold on credits at which
|
|
* the transmit rate is increased.
|
|
*
|
|
* XXX this algorithm is flawed.
|
|
*/
|
|
static int ath_rateinterval = 1000; /* rate ctl interval (ms) */
|
|
static int ath_rate_raise = 10; /* add credit threshold */
|
|
static int ath_rate_raise_threshold = 10; /* rate ctl raise threshold */
|
|
|
|
static void ath_rate_update(struct ath_softc *, struct ieee80211_node *,
|
|
int rate);
|
|
static void ath_rate_ctl_start(struct ath_softc *, struct ieee80211_node *);
|
|
static void ath_rate_ctl(void *, struct ieee80211_node *);
|
|
|
|
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)
|
|
{
|
|
}
|
|
|
|
void
|
|
ath_rate_findrate(struct ath_softc *sc, struct ath_node *an,
|
|
int shortPreamble, size_t frameLen,
|
|
u_int8_t *rix, int *try0, u_int8_t *txrate)
|
|
{
|
|
struct onoe_node *on = ATH_NODE_ONOE(an);
|
|
|
|
*rix = on->on_tx_rix0;
|
|
*try0 = on->on_tx_try0;
|
|
if (shortPreamble)
|
|
*txrate = on->on_tx_rate0sp;
|
|
else
|
|
*txrate = on->on_tx_rate0;
|
|
}
|
|
|
|
/*
|
|
* Get the TX rates.
|
|
*
|
|
* The short preamble bits aren't set here; the caller should augment
|
|
* the returned rate with the relevant preamble rate flag.
|
|
*/
|
|
void
|
|
ath_rate_getxtxrates(struct ath_softc *sc, struct ath_node *an,
|
|
uint8_t rix0, struct ath_rc_series *rc)
|
|
{
|
|
struct onoe_node *on = ATH_NODE_ONOE(an);
|
|
|
|
rc[0].flags = rc[1].flags = rc[2].flags = rc[3].flags = 0;
|
|
|
|
rc[0].rix = on->on_tx_rate0;
|
|
rc[1].rix = on->on_tx_rate1;
|
|
rc[2].rix = on->on_tx_rate2;
|
|
rc[3].rix = on->on_tx_rate3;
|
|
|
|
rc[0].tries = on->on_tx_try0;
|
|
rc[1].tries = 2;
|
|
rc[2].tries = 2;
|
|
rc[3].tries = 2;
|
|
}
|
|
|
|
void
|
|
ath_rate_setupxtxdesc(struct ath_softc *sc, struct ath_node *an,
|
|
struct ath_desc *ds, int shortPreamble, u_int8_t rix)
|
|
{
|
|
struct onoe_node *on = ATH_NODE_ONOE(an);
|
|
|
|
ath_hal_setupxtxdesc(sc->sc_ah, ds
|
|
, on->on_tx_rate1sp, 2 /* series 1 */
|
|
, on->on_tx_rate2sp, 2 /* series 2 */
|
|
, on->on_tx_rate3sp, 2 /* series 3 */
|
|
);
|
|
}
|
|
|
|
void
|
|
ath_rate_tx_complete(struct ath_softc *sc, struct ath_node *an,
|
|
const struct ath_rc_series *rc, const struct ath_tx_status *ts,
|
|
int frame_size, int nframes, int nbad)
|
|
{
|
|
struct onoe_node *on = ATH_NODE_ONOE(an);
|
|
|
|
if (ts->ts_status == 0)
|
|
on->on_tx_ok++;
|
|
else
|
|
on->on_tx_err++;
|
|
on->on_tx_retr += ts->ts_shortretry
|
|
+ ts->ts_longretry;
|
|
if (on->on_interval != 0 && ticks - on->on_ticks > on->on_interval) {
|
|
ath_rate_ctl(sc, &an->an_node);
|
|
on->on_ticks = ticks;
|
|
}
|
|
}
|
|
|
|
void
|
|
ath_rate_newassoc(struct ath_softc *sc, struct ath_node *an, int isnew)
|
|
{
|
|
if (isnew)
|
|
ath_rate_ctl_start(sc, &an->an_node);
|
|
}
|
|
|
|
static void
|
|
ath_rate_update(struct ath_softc *sc, struct ieee80211_node *ni, int rate)
|
|
{
|
|
struct ath_node *an = ATH_NODE(ni);
|
|
struct onoe_node *on = ATH_NODE_ONOE(an);
|
|
struct ieee80211vap *vap = ni->ni_vap;
|
|
const HAL_RATE_TABLE *rt = sc->sc_currates;
|
|
u_int8_t rix;
|
|
|
|
KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
|
|
|
|
IEEE80211_NOTE(vap, IEEE80211_MSG_RATECTL, ni,
|
|
"%s: set xmit rate to %dM", __func__,
|
|
ni->ni_rates.rs_nrates > 0 ?
|
|
(ni->ni_rates.rs_rates[rate] & IEEE80211_RATE_VAL) / 2 : 0);
|
|
|
|
/*
|
|
* Before associating a node has no rate set setup
|
|
* so we can't calculate any transmit codes to use.
|
|
* This is ok since we should never be sending anything
|
|
* but management frames and those always go at the
|
|
* lowest hardware rate.
|
|
*/
|
|
if (ni->ni_rates.rs_nrates == 0)
|
|
goto done;
|
|
on->on_rix = rate;
|
|
ni->ni_txrate = ni->ni_rates.rs_rates[rate] & IEEE80211_RATE_VAL;
|
|
on->on_tx_rix0 = sc->sc_rixmap[ni->ni_txrate];
|
|
on->on_tx_rate0 = rt->info[on->on_tx_rix0].rateCode;
|
|
|
|
on->on_tx_rate0sp = on->on_tx_rate0 |
|
|
rt->info[on->on_tx_rix0].shortPreamble;
|
|
if (sc->sc_mrretry) {
|
|
/*
|
|
* Hardware supports multi-rate retry; setup two
|
|
* step-down retry rates and make the lowest rate
|
|
* be the ``last chance''. We use 4, 2, 2, 2 tries
|
|
* respectively (4 is set here, the rest are fixed
|
|
* in the xmit routine).
|
|
*/
|
|
on->on_tx_try0 = 1 + 3; /* 4 tries at rate 0 */
|
|
if (--rate >= 0) {
|
|
rix = sc->sc_rixmap[
|
|
ni->ni_rates.rs_rates[rate]&IEEE80211_RATE_VAL];
|
|
on->on_tx_rate1 = rt->info[rix].rateCode;
|
|
on->on_tx_rate1sp = on->on_tx_rate1 |
|
|
rt->info[rix].shortPreamble;
|
|
} else {
|
|
on->on_tx_rate1 = on->on_tx_rate1sp = 0;
|
|
}
|
|
if (--rate >= 0) {
|
|
rix = sc->sc_rixmap[
|
|
ni->ni_rates.rs_rates[rate]&IEEE80211_RATE_VAL];
|
|
on->on_tx_rate2 = rt->info[rix].rateCode;
|
|
on->on_tx_rate2sp = on->on_tx_rate2 |
|
|
rt->info[rix].shortPreamble;
|
|
} else {
|
|
on->on_tx_rate2 = on->on_tx_rate2sp = 0;
|
|
}
|
|
if (rate > 0) {
|
|
/* NB: only do this if we didn't already do it above */
|
|
on->on_tx_rate3 = rt->info[0].rateCode;
|
|
on->on_tx_rate3sp =
|
|
on->on_tx_rate3 | rt->info[0].shortPreamble;
|
|
} else {
|
|
on->on_tx_rate3 = on->on_tx_rate3sp = 0;
|
|
}
|
|
} else {
|
|
on->on_tx_try0 = ATH_TXMAXTRY; /* max tries at rate 0 */
|
|
on->on_tx_rate1 = on->on_tx_rate1sp = 0;
|
|
on->on_tx_rate2 = on->on_tx_rate2sp = 0;
|
|
on->on_tx_rate3 = on->on_tx_rate3sp = 0;
|
|
}
|
|
done:
|
|
on->on_tx_ok = on->on_tx_err = on->on_tx_retr = on->on_tx_upper = 0;
|
|
|
|
on->on_interval = ath_rateinterval;
|
|
if (vap->iv_opmode == IEEE80211_M_STA)
|
|
on->on_interval /= 2;
|
|
on->on_interval = (on->on_interval * hz) / 1000;
|
|
}
|
|
|
|
/*
|
|
* Set the starting transmit rate for a node.
|
|
*/
|
|
static void
|
|
ath_rate_ctl_start(struct ath_softc *sc, struct ieee80211_node *ni)
|
|
{
|
|
#define RATE(_ix) (ni->ni_rates.rs_rates[(_ix)] & IEEE80211_RATE_VAL)
|
|
const struct ieee80211_txparam *tp = ni->ni_txparms;
|
|
int srate;
|
|
|
|
KASSERT(ni->ni_rates.rs_nrates > 0, ("no rates"));
|
|
if (tp == NULL || tp->ucastrate == IEEE80211_FIXED_RATE_NONE) {
|
|
/*
|
|
* No fixed rate is requested. For 11b start with
|
|
* the highest negotiated rate; otherwise, for 11g
|
|
* and 11a, we start "in the middle" at 24Mb or 36Mb.
|
|
*/
|
|
srate = ni->ni_rates.rs_nrates - 1;
|
|
if (sc->sc_curmode != IEEE80211_MODE_11B) {
|
|
/*
|
|
* Scan the negotiated rate set to find the
|
|
* closest rate.
|
|
*/
|
|
/* NB: the rate set is assumed sorted */
|
|
for (; srate >= 0 && RATE(srate) > 72; srate--)
|
|
;
|
|
}
|
|
} else {
|
|
/*
|
|
* A fixed rate is to be used; ic_fixed_rate is the
|
|
* IEEE code for this rate (sans basic bit). Convert this
|
|
* to the index into the negotiated rate set for
|
|
* the node. We know the rate is there because the
|
|
* rate set is checked when the station associates.
|
|
*/
|
|
/* NB: the rate set is assumed sorted */
|
|
srate = ni->ni_rates.rs_nrates - 1;
|
|
for (; srate >= 0 && RATE(srate) != tp->ucastrate; srate--)
|
|
;
|
|
}
|
|
/*
|
|
* The selected rate may not be available due to races
|
|
* and mode settings. Also orphaned nodes created in
|
|
* adhoc mode may not have any rate set so this lookup
|
|
* can fail. This is not fatal.
|
|
*/
|
|
ath_rate_update(sc, ni, srate < 0 ? 0 : srate);
|
|
#undef RATE
|
|
}
|
|
|
|
/*
|
|
* Examine and potentially adjust the transmit rate.
|
|
*/
|
|
static void
|
|
ath_rate_ctl(void *arg, struct ieee80211_node *ni)
|
|
{
|
|
struct ath_softc *sc = arg;
|
|
struct onoe_node *on = ATH_NODE_ONOE(ATH_NODE(ni));
|
|
struct ieee80211_rateset *rs = &ni->ni_rates;
|
|
int dir = 0, nrate, enough;
|
|
|
|
/*
|
|
* Rate control
|
|
* XXX: very primitive version.
|
|
*/
|
|
enough = (on->on_tx_ok + on->on_tx_err >= 10);
|
|
|
|
/* no packet reached -> down */
|
|
if (on->on_tx_err > 0 && on->on_tx_ok == 0)
|
|
dir = -1;
|
|
|
|
/* all packets needs retry in average -> down */
|
|
if (enough && on->on_tx_ok < on->on_tx_retr)
|
|
dir = -1;
|
|
|
|
/* no error and less than rate_raise% of packets need retry -> up */
|
|
if (enough && on->on_tx_err == 0 &&
|
|
on->on_tx_retr < (on->on_tx_ok * ath_rate_raise) / 100)
|
|
dir = 1;
|
|
|
|
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
|
|
"ok %d err %d retr %d upper %d dir %d",
|
|
on->on_tx_ok, on->on_tx_err, on->on_tx_retr, on->on_tx_upper, dir);
|
|
|
|
nrate = on->on_rix;
|
|
switch (dir) {
|
|
case 0:
|
|
if (enough && on->on_tx_upper > 0)
|
|
on->on_tx_upper--;
|
|
break;
|
|
case -1:
|
|
if (nrate > 0) {
|
|
nrate--;
|
|
sc->sc_stats.ast_rate_drop++;
|
|
}
|
|
on->on_tx_upper = 0;
|
|
break;
|
|
case 1:
|
|
/* raise rate if we hit rate_raise_threshold */
|
|
if (++on->on_tx_upper < ath_rate_raise_threshold)
|
|
break;
|
|
on->on_tx_upper = 0;
|
|
if (nrate + 1 < rs->rs_nrates) {
|
|
nrate++;
|
|
sc->sc_stats.ast_rate_raise++;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (nrate != on->on_rix) {
|
|
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
|
|
"%s: %dM -> %dM (%d ok, %d err, %d retr)", __func__,
|
|
ni->ni_txrate / 2,
|
|
(rs->rs_rates[nrate] & IEEE80211_RATE_VAL) / 2,
|
|
on->on_tx_ok, on->on_tx_err, on->on_tx_retr);
|
|
ath_rate_update(sc, ni, nrate);
|
|
} else if (enough)
|
|
on->on_tx_ok = on->on_tx_err = on->on_tx_retr = 0;
|
|
}
|
|
|
|
static void
|
|
ath_rate_sysctlattach(struct ath_softc *sc)
|
|
{
|
|
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_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
|
|
"rate_interval", CTLFLAG_RW, &ath_rateinterval, 0,
|
|
"rate control: operation interval (ms)");
|
|
/* XXX bounds check values */
|
|
SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
|
|
"rate_raise", CTLFLAG_RW, &ath_rate_raise, 0,
|
|
"rate control: retry threshold to credit rate raise (%%)");
|
|
SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
|
|
"rate_raise_threshold", CTLFLAG_RW, &ath_rate_raise_threshold,0,
|
|
"rate control: # good periods before raising rate");
|
|
}
|
|
|
|
struct ath_ratectrl *
|
|
ath_rate_attach(struct ath_softc *sc)
|
|
{
|
|
struct onoe_softc *osc;
|
|
|
|
osc = malloc(sizeof(struct onoe_softc), M_DEVBUF, M_NOWAIT|M_ZERO);
|
|
if (osc == NULL)
|
|
return NULL;
|
|
osc->arc.arc_space = sizeof(struct onoe_node);
|
|
ath_rate_sysctlattach(sc);
|
|
|
|
return &osc->arc;
|
|
}
|
|
|
|
void
|
|
ath_rate_detach(struct ath_ratectrl *arc)
|
|
{
|
|
struct onoe_softc *osc = (struct onoe_softc *) arc;
|
|
|
|
free(osc, M_DEVBUF);
|
|
}
|