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Extend the duration calculations to work with three and four stream

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rates.
This commit is contained in:
Adrian Chadd 2012-08-15 07:52:49 +00:00
parent b193c0b591
commit 6c03eb4c31
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=239287
1 changed files with 19 additions and 12 deletions
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31
sys/dev/ath/ath_hal/ah.c
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@ -275,31 +275,38 @@ ath_hal_pkt_txtime(struct ath_hal *ah, const HAL_RATE_TABLE *rates, uint32_t fra
/* 11n frame - extract out the number of spatial streams */
numStreams = HT_RC_2_STREAMS(rc);
KASSERT(numStreams == 1 || numStreams == 2, ("number of spatial streams needs to be 1 or 2: MCS rate 0x%x!", rateix));
KASSERT(numStreams > 0 && numStreams <= 4,
("number of spatial streams needs to be 1..3: MCS rate 0x%x!",
rateix));
return ath_computedur_ht(frameLen, rc, numStreams, isht40, shortPreamble);
}
static const uint16_t ht20_bps[32] = {
26, 52, 78, 104, 156, 208, 234, 260,
52, 104, 156, 208, 312, 416, 468, 520,
78, 156, 234, 312, 468, 624, 702, 780,
104, 208, 312, 416, 624, 832, 936, 1040
};
static const uint16_t ht40_bps[32] = {
54, 108, 162, 216, 324, 432, 486, 540,
108, 216, 324, 432, 648, 864, 972, 1080,
162, 324, 486, 648, 972, 1296, 1458, 1620,
216, 432, 648, 864, 1296, 1728, 1944, 2160
};
/*
* Calculate the transmit duration of an 11n frame.
* This only works for MCS0->MCS15.
*/
uint32_t
ath_computedur_ht(uint32_t frameLen, uint16_t rate, int streams, HAL_BOOL isht40,
HAL_BOOL isShortGI)
ath_computedur_ht(uint32_t frameLen, uint16_t rate, int streams,
HAL_BOOL isht40, HAL_BOOL isShortGI)
{
static const uint16_t ht20_bps[16] = {
26, 52, 78, 104, 156, 208, 234, 260,
52, 104, 156, 208, 312, 416, 468, 520
};
static const uint16_t ht40_bps[16] = {
54, 108, 162, 216, 324, 432, 486, 540,
108, 216, 324, 432, 648, 864, 972, 1080,
};
uint32_t bitsPerSymbol, numBits, numSymbols, txTime;
KASSERT(rate & IEEE80211_RATE_MCS, ("not mcs %d", rate));
KASSERT((rate &~ IEEE80211_RATE_MCS) < 16, ("bad mcs 0x%x", rate));
KASSERT((rate &~ IEEE80211_RATE_MCS) < 31, ("bad mcs 0x%x", rate));
if (isht40)
bitsPerSymbol = ht40_bps[rate & 0xf];