mac80211: Disable MCS > 7 in minstrel_ht when STA uses static SMPS

Disable multi stream rates (MCS > 7) when a STA is in static SMPS mode
since it has only one active rx chain. Hence, it doesn't even make
sense to sample multi stream rates.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/net/mac80211/rc80211_minstrel_ht.c b/net/mac80211/rc80211_minstrel_ht.c
index ff5f7b8..2b42564 100644 (file)
--- a/net/mac80211/rc80211_minstrel_ht.c
+++ b/net/mac80211/rc80211_minstrel_ht.c
@@ -692,6 +692,7 @@ minstrel_ht_update_caps(void *priv, struct ieee80211_supported_band *sband,
        int ack_dur;
        int stbc;
        int i;
+       unsigned int smps;
 
        /* fall back to the old minstrel for legacy stations */
        if (!sta->ht_cap.ht_supported)
@@ -731,6 +732,9 @@ minstrel_ht_update_caps(void *priv, struct ieee80211_supported_band *sband,
            oper_chan_type != NL80211_CHAN_HT40PLUS)
                sta_cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 
+       smps = (sta_cap & IEEE80211_HT_CAP_SM_PS) >>
+               IEEE80211_HT_CAP_SM_PS_SHIFT;
+
        for (i = 0; i < ARRAY_SIZE(mi->groups); i++) {
                u16 req = 0;
 
@@ -748,6 +752,11 @@ minstrel_ht_update_caps(void *priv, struct ieee80211_supported_band *sband,
                if ((sta_cap & req) != req)
                        continue;
 
+               /* Mark MCS > 7 as unsupported if STA is in static SMPS mode */
+               if (smps == WLAN_HT_CAP_SM_PS_STATIC &&
+                   minstrel_mcs_groups[i].streams > 1)
+                       continue;
+
                mi->groups[i].supported =
                        mcs->rx_mask[minstrel_mcs_groups[i].streams - 1];