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o mark the device capable of short preamble (meaningless for the 5210 but

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safe since the 802.11 layer does the right thing for 11a operation)
o select short preamble operation based on the negotiated capabilities; not
  just the local state/capability
o fillin the duration field in the 802.11 header as appropriate
o remove detection of 11g support; no longer needed

Obtained from:	MADWIFI (with modifications)
This commit is contained in:
sam 2003-09-14 22:39:19 +00:00
parent 73b49f3a66
commit 5b99feb205
2 changed files with 18 additions and 16 deletions
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33
sys/dev/ath/if_ath.c
View File

@ -279,10 +279,7 @@ ath_attach(u_int16_t devid, struct ath_softc *sc)
ic->ic_phytype = IEEE80211_T_OFDM;
ic->ic_opmode = IEEE80211_M_STA;
ic->ic_caps = IEEE80211_C_WEP | IEEE80211_C_IBSS | IEEE80211_C_HOSTAP
| IEEE80211_C_MONITOR;
/* NB: 11g support is identified when we fetch the channel set */
if (sc->sc_have11g)
ic->ic_caps |= IEEE80211_C_SHPREAMBLE;
| IEEE80211_C_MONITOR | IEEE80211_C_SHPREAMBLE;
/* get mac address from hardware */
ath_hal_getmac(ah, ic->ic_myaddr);
@ -765,13 +762,6 @@ ath_start(struct ifnet *ifp)
}
}
/*
* TODO:
* The duration field of 802.11 header should be filled.
* XXX This may be done in the ieee80211 layer, but the upper
* doesn't know the detail of parameters such as IFS
* for now..
*/
if (ath_tx_start(sc, ni, bf, m)) {
bad:
mtx_lock(&sc->sc_txbuflock);
@ -1797,7 +1787,8 @@ ath_tx_start(struct ath_softc *sc, struct ieee80211_node *ni, struct ath_buf *bf
* use short preamble based on the current mode and
* negotiated parameters.
*/
if (ic->ic_flags & IEEE80211_F_SHPREAMBLE) {
if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
txrate = rt->info[rix].rateCode | rt->info[rix].shortPreamble;
shortPreamble = AH_TRUE;
sc->sc_stats.ast_tx_shortpre++;
@ -1818,6 +1809,21 @@ ath_tx_start(struct ath_softc *sc, struct ieee80211_node *ni, struct ath_buf *bf
sc->sc_stats.ast_tx_rts++;
}
/*
* Calculate duration. This logically belongs in the 802.11
* layer but it lacks sufficient information to calculate it.
*/
if ((flags & HAL_TXDESC_NOACK) == 0 &&
(wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) != IEEE80211_FC0_TYPE_CTL) {
u_int16_t dur;
/*
* XXX not right with fragmentation.
*/
dur = ath_hal_computetxtime(ah, rt, IEEE80211_ACK_SIZE,
rix, shortPreamble);
*((u_int16_t*) wh->i_dur) = htole16(dur);
}
/*
* Calculate RTS/CTS rate and duration if needed.
*/
@ -2395,7 +2401,6 @@ ath_getchannels(struct ath_softc *sc, u_int cc, HAL_BOOL outdoor)
HAL_CHANNEL *chans;
int i, ix, nchan;
sc->sc_have11g = 0;
chans = malloc(IEEE80211_CHAN_MAX * sizeof(HAL_CHANNEL),
M_TEMP, M_NOWAIT);
if (chans == NULL) {
@ -2429,8 +2434,6 @@ ath_getchannels(struct ath_softc *sc, u_int cc, HAL_BOOL outdoor)
/* channels overlap; e.g. 11g and 11b */
ic->ic_channels[ix].ic_flags |= c->channelFlags;
}
if ((c->channelFlags & CHANNEL_G) == CHANNEL_G)
sc->sc_have11g = 1;
}
free(chans, M_TEMP);
return 0;

1
sys/dev/ath/if_athvar.h
View File

@ -90,7 +90,6 @@ struct ath_softc {
struct mtx sc_mtx; /* master lock (recursive) */
struct ath_hal *sc_ah; /* Atheros HAL */
unsigned int sc_invalid : 1,/* disable hardware accesses */
sc_have11g : 1,/* have 11g support */
sc_doani : 1,/* dynamic noise immunity */
sc_probing : 1;/* probing AP on beacon miss */
/* rate tables */