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cfg80211: refactor cfg80211_calculate_bitrate()

Browse source 
This function contains the HT calculations, which makes no
sense - split that out into a separate function. As a side
effect, this makes the 60G flag independent from HT_MCS so
remove the MCS one from wil6210 (also deleting a duplicate
assignment.)

Signed-off-by: Johannes Berg <[email protected]>
This commit is contained in:
Johannes Berg 2017-02-15 15:02:08 +01:00
commit 0c1eca4e2f
2 changed files with 33 additions and 30 deletions
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60
net/wireless/util.c
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@ -1097,6 +1097,35 @@ int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
return err;
}
static u32 cfg80211_calculate_bitrate_ht(struct rate_info *rate)
{
int modulation, streams, bitrate;
/* the formula below does only work for MCS values smaller than 32 */
if (WARN_ON_ONCE(rate->mcs >= 32))
return 0;
modulation = rate->mcs & 7;
streams = (rate->mcs >> 3) + 1;
bitrate = (rate->bw == RATE_INFO_BW_40) ? 13500000 : 6500000;
if (modulation < 4)
bitrate *= (modulation + 1);
else if (modulation == 4)
bitrate *= (modulation + 2);
else
bitrate *= (modulation + 3);
bitrate *= streams;
if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
bitrate = (bitrate / 9) * 10;
/* do NOT round down here */
return (bitrate + 50000) / 100000;
}
static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
{
static const u32 __mcs2bitrate[] = {
@ -1230,39 +1259,14 @@ static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
u32 cfg80211_calculate_bitrate(struct rate_info *rate)
{
int modulation, streams, bitrate;
if (!(rate->flags & RATE_INFO_FLAGS_MCS) &&
!(rate->flags & RATE_INFO_FLAGS_VHT_MCS))
return rate->legacy;
if (rate->flags & RATE_INFO_FLAGS_MCS)
return cfg80211_calculate_bitrate_ht(rate);
if (rate->flags & RATE_INFO_FLAGS_60G)
return cfg80211_calculate_bitrate_60g(rate);
if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
return cfg80211_calculate_bitrate_vht(rate);
/* the formula below does only work for MCS values smaller than 32 */
if (WARN_ON_ONCE(rate->mcs >= 32))
return 0;
modulation = rate->mcs & 7;
streams = (rate->mcs >> 3) + 1;
bitrate = (rate->bw == RATE_INFO_BW_40) ? 13500000 : 6500000;
if (modulation < 4)
bitrate *= (modulation + 1);
else if (modulation == 4)
bitrate *= (modulation + 2);
else
bitrate *= (modulation + 3);
bitrate *= streams;
if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
bitrate = (bitrate / 9) * 10;
/* do NOT round down here */
return (bitrate + 50000) / 100000;
return rate->legacy;
}
EXPORT_SYMBOL(cfg80211_calculate_bitrate);