From: Eyal Shapira <eyal@xxxxxxxxxx>
Restrict our published beamformee STS capability according
to the AP value.
Some AP show bad behaviour in interoperability testing
when our capabilities are better.
Signed-off-by: Eyal Shapira <eyalx.shapira@xxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
net/mac80211/mlme.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index dc770bd..2d7e1bee 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -508,6 +508,7 @@ static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
u8 *pos;
u32 cap;
struct ieee80211_sta_vht_cap vht_cap;
+ u32 mask, ap_bf_sts, our_bf_sts;
BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));
@@ -535,6 +536,16 @@ static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;
+ mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
+
+ ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
+ our_bf_sts = cap & mask;
+
+ if (ap_bf_sts < our_bf_sts) {
+ cap &= ~mask;
+ cap |= ap_bf_sts;
+ }
+
/* reserve and fill IE */
pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
--
1.8.5.1
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