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optimize ath_tx_findrix: there's no need to walk the rates table as

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sc_rixmap is an inverse map

NB: could eliminate the check for an invalid rate by filling in 0 for
    invalid entries but the rate control modules use it to identify
    bogus rates so leave it for now
This commit is contained in:
Sam Leffler 2009-05-07 00:35:32 +00:00
parent a8962181ad
commit ab06fdf2a5
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=191866
1 changed files with 18 additions and 20 deletions
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38
sys/dev/ath/if_ath.c
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@ -4222,17 +4222,15 @@ ath_tx_cleanup(struct ath_softc *sc)
}
/*
* Return h/w rate index for an IEEE rate (w/o basic rate bit).
* Return h/w rate index for an IEEE rate (w/o basic rate bit)
* using the current rates in sc_rixmap.
*/
static int
ath_tx_findrix(const HAL_RATE_TABLE *rt, int rate)
static __inline int
ath_tx_findrix(const struct ath_softc *sc, uint8_t rate)
{
int i;
for (i = 0; i < rt->rateCount; i++)
if ((rt->info[i].dot11Rate & IEEE80211_RATE_VAL) == rate)
return i;
return 0; /* NB: lowest rate */
int rix = sc->sc_rixmap[rate];
/* NB: return lowest rix for invalid rate */
return (rix == 0xff ? 0 : rix);
}
/*
@ -5760,8 +5758,8 @@ ath_newassoc(struct ieee80211_node *ni, int isnew)
struct ath_softc *sc = vap->iv_ic->ic_ifp->if_softc;
const struct ieee80211_txparam *tp = ni->ni_txparms;
an->an_mcastrix = ath_tx_findrix(sc->sc_currates, tp->mcastrate);
an->an_mgmtrix = ath_tx_findrix(sc->sc_currates, tp->mgmtrate);
an->an_mcastrix = ath_tx_findrix(sc, tp->mcastrate);
an->an_mgmtrix = ath_tx_findrix(sc, tp->mgmtrate);
ath_rate_newassoc(sc, an, isnew);
if (isnew &&
@ -6009,9 +6007,9 @@ ath_setcurmode(struct ath_softc *sc, enum ieee80211_phymode mode)
* 11g, otherwise at 1Mb/s.
*/
if (mode == IEEE80211_MODE_11G)
sc->sc_protrix = ath_tx_findrix(rt, 2*2);
sc->sc_protrix = ath_tx_findrix(sc, 2*2);
else
sc->sc_protrix = ath_tx_findrix(rt, 2*1);
sc->sc_protrix = ath_tx_findrix(sc, 2*1);
/* NB: caller is responsible for reseting rate control state */
#undef N
}
@ -6749,7 +6747,7 @@ ath_tx_raw_start(struct ath_softc *sc, struct ieee80211_node *ni,
rt = sc->sc_currates;
KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
rix = ath_tx_findrix(rt, params->ibp_rate0);
rix = ath_tx_findrix(sc, params->ibp_rate0);
txrate = rt->info[rix].rateCode;
if (params->ibp_flags & IEEE80211_BPF_SHORTPRE)
txrate |= rt->info[rix].shortPreamble;
@ -6761,7 +6759,7 @@ ath_tx_raw_start(struct ath_softc *sc, struct ieee80211_node *ni,
txantenna = sc->sc_txantenna;
ctsduration = 0;
if (flags & (HAL_TXDESC_CTSENA | HAL_TXDESC_RTSENA)) {
cix = ath_tx_findrix(rt, params->ibp_ctsrate);
cix = ath_tx_findrix(sc, params->ibp_ctsrate);
ctsrate = rt->info[cix].rateCode;
if (params->ibp_flags & IEEE80211_BPF_SHORTPRE) {
ctsrate |= rt->info[cix].shortPreamble;
@ -6827,19 +6825,19 @@ ath_tx_raw_start(struct ath_softc *sc, struct ieee80211_node *ni,
bf->bf_txflags = flags;
if (ismrr) {
rix = ath_tx_findrix(rt, params->ibp_rate1);
rix = ath_tx_findrix(sc, params->ibp_rate1);
rate1 = rt->info[rix].rateCode;
if (params->ibp_flags & IEEE80211_BPF_SHORTPRE)
rate1 |= rt->info[rix].shortPreamble;
if (params->ibp_try2) {
rix = ath_tx_findrix(rt, params->ibp_rate2);
rix = ath_tx_findrix(sc, params->ibp_rate2);
rate2 = rt->info[rix].rateCode;
if (params->ibp_flags & IEEE80211_BPF_SHORTPRE)
rate2 |= rt->info[rix].shortPreamble;
} else
rate2 = 0;
if (params->ibp_try3) {
rix = ath_tx_findrix(rt, params->ibp_rate3);
rix = ath_tx_findrix(sc, params->ibp_rate3);
rate3 = rt->info[rix].rateCode;
if (params->ibp_flags & IEEE80211_BPF_SHORTPRE)
rate3 |= rt->info[rix].shortPreamble;
@ -7063,9 +7061,9 @@ ath_tdma_config(struct ath_softc *sc, struct ieee80211vap *vap)
*/
tdma = vap->iv_tdma;
if (tp->ucastrate != IEEE80211_FIXED_RATE_NONE)
rix = ath_tx_findrix(sc->sc_currates, tp->ucastrate);
rix = ath_tx_findrix(sc, tp->ucastrate);
else
rix = ath_tx_findrix(sc->sc_currates, tp->mcastrate);
rix = ath_tx_findrix(sc, tp->mcastrate);
/* XXX short preamble assumed */
sc->sc_tdmaguard = ath_hal_computetxtime(ah, sc->sc_currates,
ifp->if_mtu + IEEE80211_MAXOVERHEAD, rix, AH_TRUE);