/*
* Setup a 11n rate series structure
*
* This should be called for both legacy and MCS rates.
*
* It, along with ath_buf_set_rate, must be called -after- a burst
* or aggregate is setup.
*/
static void
ath_rateseries_setup(struct ath_softc *sc, struct ieee80211_node *ni,
struct ath_buf *bf, HAL_11N_RATE_SERIES *series)
{
#define HT_RC_2_STREAMS(_rc) ((((_rc) & 0x78) >> 3) + 1)
struct ieee80211com *ic = ni->ni_ic;
struct ath_hal *ah = sc->sc_ah;
HAL_BOOL shortPreamble = AH_FALSE;
const HAL_RATE_TABLE *rt = sc->sc_currates;
int i;
int pktlen;
int flags = bf->bf_state.bfs_txflags;
struct ath_rc_series *rc = bf->bf_state.bfs_rc;
if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE))
shortPreamble = AH_TRUE;
/*
* If this is the first frame in an aggregate series,
* use the aggregate length.
*/
if (bf->bf_state.bfs_aggr)
pktlen = bf->bf_state.bfs_al;
else
pktlen = bf->bf_state.bfs_pktlen;
/*
* XXX TODO: modify this routine to use the bfs_rc[x].flags
* XXX fields.
*/
memset(series, 0, sizeof(HAL_11N_RATE_SERIES) * 4);
for (i = 0; i < 4; i++) {
/* Only set flags for actual TX attempts */
if (rc[i].tries == 0)
continue;
series[i].Tries = rc[i].tries;
/*
* XXX this isn't strictly correct - sc_txchainmask
* XXX isn't the currently active chainmask;
* XXX it's the interface chainmask at startup.
* XXX It's overridden in the HAL rate scenario function
* XXX for now.
*/
series[i].ChSel = sc->sc_txchainmask;
if (flags & (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA))
series[i].RateFlags |= HAL_RATESERIES_RTS_CTS;
/*
* Transmit 40MHz frames only if the node has negotiated
* it rather than whether the node is capable of it or not.
* It's subtly different in the hostap case.
*/
if (ni->ni_chw == 40)
series[i].RateFlags |= HAL_RATESERIES_2040;
/*
* Set short-GI only if the node has advertised it
* the channel width is suitable, and we support it.
* We don't currently have a "negotiated" set of bits -
* ni_htcap is what the remote end sends, not what this
* node is capable of.
*/
if (ni->ni_chw == 40 &&
ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40 &&
ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40)
series[i].RateFlags |= HAL_RATESERIES_HALFGI;
if (ni->ni_chw == 20 &&
ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20 &&
ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20)
series[i].RateFlags |= HAL_RATESERIES_HALFGI;
series[i].Rate = rt->info[rc[i].rix].rateCode;
/* PktDuration doesn't include slot, ACK, RTS, etc timing - it's just the packet duration */
if (series[i].Rate & IEEE80211_RATE_MCS) {
series[i].PktDuration =
ath_computedur_ht(pktlen
, series[i].Rate
, HT_RC_2_STREAMS(series[i].Rate)
, series[i].RateFlags & HAL_RATESERIES_2040
, series[i].RateFlags & HAL_RATESERIES_HALFGI);
} else {
if (shortPreamble)
series[i].Rate |=
rt->info[rc[i].rix].shortPreamble;
series[i].PktDuration = ath_hal_computetxtime(ah,
rt, pktlen, rc[i].rix, shortPreamble);
}
}
#undef HT_RC_2_STREAMS
}
/*
* Setup a 11n rate series structure
*
* This should be called for both legacy and MCS rates.
*
* This uses the rate series stuf from ath_tx_rate_fill_rcflags().
*
* It, along with ath_buf_set_rate, must be called -after- a burst
* or aggregate is setup.
*/
static void
ath_rateseries_setup(struct ath_softc *sc, struct ieee80211_node *ni,
struct ath_buf *bf, HAL_11N_RATE_SERIES *series)
{
struct ieee80211com *ic = ni->ni_ic;
struct ath_hal *ah = sc->sc_ah;
HAL_BOOL shortPreamble = AH_FALSE;
const HAL_RATE_TABLE *rt = sc->sc_currates;
int i;
int pktlen;
struct ath_rc_series *rc = bf->bf_state.bfs_rc;
if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE))
shortPreamble = AH_TRUE;
/*
* If this is the first frame in an aggregate series,
* use the aggregate length.
*/
if (bf->bf_state.bfs_aggr)
pktlen = bf->bf_state.bfs_al;
else
pktlen = bf->bf_state.bfs_pktlen;
/*
* XXX TODO: modify this routine to use the bfs_rc[x].flags
* XXX fields.
*/
memset(series, 0, sizeof(HAL_11N_RATE_SERIES) * 4);
for (i = 0; i < ATH_RC_NUM; i++) {
/* Only set flags for actual TX attempts */
if (rc[i].tries == 0)
continue;
series[i].Tries = rc[i].tries;
/*
* XXX TODO: When the NIC is capable of three stream TX,
* transmit 1/2 stream rates on two streams.
*
* This reduces the power consumption of the NIC and
* keeps it within the PCIe slot power limits.
*/
series[i].ChSel = sc->sc_cur_txchainmask;
/*
* Setup rate and TX power cap for this series.
*/
series[i].Rate = rt->info[rc[i].rix].rateCode;
series[i].RateIndex = rc[i].rix;
series[i].tx_power_cap = rc[i].tx_power_cap;
/*
* Enable RTS/CTS as appropriate.
*/
if (rc[i].flags & ATH_RC_RTSCTS_FLAG)
series[i].RateFlags |= HAL_RATESERIES_RTS_CTS;
/*
* 11n rate? Update 11n flags.
*/
if (rc[i].flags & ATH_RC_HT_FLAG) {
if (rc[i].flags & ATH_RC_CW40_FLAG)
series[i].RateFlags |= HAL_RATESERIES_2040;
if (rc[i].flags & ATH_RC_SGI_FLAG)
series[i].RateFlags |= HAL_RATESERIES_HALFGI;
if (rc[i].flags & ATH_RC_STBC_FLAG)
series[i].RateFlags |= HAL_RATESERIES_STBC;
}
/*
* TODO: If we're all doing 11n rates then we can set LDPC.
* If we've been asked to /do/ LDPC but we are handed a
* legacy rate, then we should complain. Loudly.
*/
/*
* PktDuration doesn't include slot, ACK, RTS, etc timing -
* it's just the packet duration
*/
if (rc[i].flags & ATH_RC_HT_FLAG) {
series[i].PktDuration =
ath_computedur_ht(pktlen
, series[i].Rate
, HT_RC_2_STREAMS(series[i].Rate)
, series[i].RateFlags & HAL_RATESERIES_2040
, series[i].RateFlags & HAL_RATESERIES_HALFGI);
} else {
if (shortPreamble)
series[i].Rate |=
rt->info[rc[i].rix].shortPreamble;
series[i].PktDuration = ath_hal_computetxtime(ah,
rt, pktlen, rc[i].rix, shortPreamble);
}
}
}
