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@xxxxxxxxxxxxxx>
---
I haven't found a STA that makes use of static SMPS, so this is only compile tested.
net/mac80211/rc80211_minstrel_ht.c | 9 +++++++++
1 files changed, 9 insertions(+), 0 deletions(-)
diff --git a/net/mac80211/rc80211_minstrel_ht.c b/net/mac80211/rc80211_minstrel_ht.c
index ff5f7b8..2b42564 100644
--- 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];
--
1.7.7
--
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