mac80211: encode rate type (legacy, HT, VHT) with fewer bits

We don't really need three different bits for each, since the
types are mutually exclusive. Use just two bits for it.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 3323a2f..81ec1f7 100644 (file)
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -1960,14 +1960,17 @@ static void sta_stats_decode_rate(struct ieee80211_local *local, u16 rate,
        rinfo->bw = (rate & STA_STATS_RATE_BW_MASK) >>
                STA_STATS_RATE_BW_SHIFT;
 
-       if (rate & STA_STATS_RATE_VHT) {
+       switch (rate & STA_STATS_RATE_TYPE_MASK) {
+       case STA_STATS_RATE_TYPE_VHT:
                rinfo->flags = RATE_INFO_FLAGS_VHT_MCS;
                rinfo->mcs = rate & 0xf;
                rinfo->nss = (rate & 0xf0) >> 4;
-       } else if (rate & STA_STATS_RATE_HT) {
+               break;
+       case STA_STATS_RATE_TYPE_HT:
                rinfo->flags = RATE_INFO_FLAGS_MCS;
                rinfo->mcs = rate & 0xff;
-       } else if (rate & STA_STATS_RATE_LEGACY) {
+               break;
+       case STA_STATS_RATE_TYPE_LEGACY: {
                struct ieee80211_supported_band *sband;
                u16 brate;
                unsigned int shift;
@@ -1982,6 +1985,8 @@ static void sta_stats_decode_rate(struct ieee80211_local *local, u16 rate,
                else
                        shift = 0;
                rinfo->legacy = DIV_ROUND_UP(brate, 1 << shift);
+               break;
+               }
        }
 
        if (rate & STA_STATS_RATE_SGI)

diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h
index cc413f5..8949266 100644 (file)
--- a/net/mac80211/sta_info.h
+++ b/net/mac80211/sta_info.h
@@ -728,9 +728,10 @@ void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta);
 unsigned long ieee80211_sta_last_active(struct sta_info *sta);
 
 #define STA_STATS_RATE_INVALID         0
-#define STA_STATS_RATE_VHT             0x8000
-#define STA_STATS_RATE_HT              0x4000
-#define STA_STATS_RATE_LEGACY          0x2000
+#define STA_STATS_RATE_TYPE_MASK       0xC000
+#define STA_STATS_RATE_TYPE_LEGACY     0x4000
+#define STA_STATS_RATE_TYPE_HT         0x8000
+#define STA_STATS_RATE_TYPE_VHT                0xC000
 #define STA_STATS_RATE_SGI             0x1000
 #define STA_STATS_RATE_BW_SHIFT                9
 #define STA_STATS_RATE_BW_MASK         (0x7 << STA_STATS_RATE_BW_SHIFT)
@@ -756,11 +757,11 @@ static inline u16 sta_stats_encode_rate(struct ieee80211_rx_status *s)
                r |= STA_STATS_RATE_SGI;
 
        if (s->flag & RX_FLAG_VHT)
-               r |= STA_STATS_RATE_VHT | (s->vht_nss << 4);
+               r |= STA_STATS_RATE_TYPE_VHT | (s->vht_nss << 4);
        else if (s->flag & RX_FLAG_HT)
-               r |= STA_STATS_RATE_HT;
+               r |= STA_STATS_RATE_TYPE_HT;
        else
-               r |= STA_STATS_RATE_LEGACY | (s->band << 4);
+               r |= STA_STATS_RATE_TYPE_LEGACY | (s->band << 4);
 
        return r;
 }