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authorJohannes Berg <johannes.berg@intel.com>2012-11-09 17:56:41 +0400
committerJohannes Berg <johannes.berg@intel.com>2012-11-26 15:42:59 +0400
commitdb9c64cf8d9d3fcbc34b09d037f266d1fc9f928c (patch)
tree86326193fa7ad6762023e1777402bc3662c53597 /net/wireless/util.c
parent4bf88530be971bf95a7830ca61b4120980bf4347 (diff)
downloadlinux-db9c64cf8d9d3fcbc34b09d037f266d1fc9f928c.tar.xz
nl80211/cfg80211: add VHT MCS support
Add support for reporting and calculating VHT MCSes. Note that I'm not completely sure that the bitrate calculations are correct, nor that they can't be simplified. Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/wireless/util.c')
-rw-r--r--net/wireless/util.c74
1 files changed, 73 insertions, 1 deletions
diff --git a/net/wireless/util.c b/net/wireless/util.c
index db61fe8a6b6d..3cce6e486219 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -944,14 +944,86 @@ static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
return __mcs2bitrate[rate->mcs];
}
+static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
+{
+ static const u32 base[4][10] = {
+ { 6500000,
+ 13000000,
+ 19500000,
+ 26000000,
+ 39000000,
+ 52000000,
+ 58500000,
+ 65000000,
+ 78000000,
+ 0,
+ },
+ { 13500000,
+ 27000000,
+ 40500000,
+ 54000000,
+ 81000000,
+ 108000000,
+ 121500000,
+ 135000000,
+ 162000000,
+ 180000000,
+ },
+ { 29300000,
+ 58500000,
+ 87800000,
+ 117000000,
+ 175500000,
+ 234000000,
+ 263300000,
+ 292500000,
+ 351000000,
+ 390000000,
+ },
+ { 58500000,
+ 117000000,
+ 175500000,
+ 234000000,
+ 351000000,
+ 468000000,
+ 526500000,
+ 585000000,
+ 702000000,
+ 780000000,
+ },
+ };
+ u32 bitrate;
+ int idx;
+
+ if (WARN_ON_ONCE(rate->mcs > 9))
+ return 0;
+
+ idx = rate->flags & (RATE_INFO_FLAGS_160_MHZ_WIDTH |
+ RATE_INFO_FLAGS_80P80_MHZ_WIDTH) ? 3 :
+ rate->flags & RATE_INFO_FLAGS_80_MHZ_WIDTH ? 2 :
+ rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH ? 1 : 0;
+
+ bitrate = base[idx][rate->mcs];
+ bitrate *= rate->nss;
+
+ if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
+ bitrate = (bitrate / 9) * 10;
+
+ /* do NOT round down here */
+ return (bitrate + 50000) / 100000;
+}
+
u32 cfg80211_calculate_bitrate(struct rate_info *rate)
{
int modulation, streams, bitrate;
- if (!(rate->flags & RATE_INFO_FLAGS_MCS))
+ if (!(rate->flags & RATE_INFO_FLAGS_MCS) &&
+ !(rate->flags & RATE_INFO_FLAGS_VHT_MCS))
return rate->legacy;
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))