Add peer max mpdu length configuration support in peer_assoc_he
parameters. Noticed low throughput for the STA which
supports HE, HT and not VHT in MU-MIMO case without this
configuration
Signed-off-by: Tamizh Chelvam <tamizhr@xxxxxxxxxxxxxx>
---
drivers/net/wireless/ath/ath11k/mac.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/drivers/net/wireless/ath/ath11k/mac.c b/drivers/net/wireless/ath/ath11k/mac.c
index f33c6d7..88e533c 100644
--- a/drivers/net/wireless/ath/ath11k/mac.c
+++ b/drivers/net/wireless/ath/ath11k/mac.c
@@ -1161,6 +1161,7 @@ static void ath11k_peer_assoc_h_he(struct ath11k *ar,
struct peer_assoc_params *arg)
{
const struct ieee80211_sta_he_cap *he_cap = &sta->he_cap;
+ u8 ampdu_factor;
u16 v;
if (!he_cap->has_he)
@@ -1178,6 +1179,30 @@ static void ath11k_peer_assoc_h_he(struct ath11k *ar,
/* the top most byte is used to indicate BSS color info */
arg->peer_he_ops &= 0xffffff;
+ /* As per section 26.6.1 11ax Draft5.0, if the Max AMPDU Exponent Extension
+ * in HE cap is zero, use the arg->peer_max_mpdu as calculated while parsing
+ * VHT caps(if VHT caps is present) or HT caps (if VHT caps is not present).
+ *
+ * For non-zero value of Max AMPDU Extponent Extension in HE MAC caps,
+ * if a HE STA sends VHT cap and HE cap IE in assoc request then, use
+ * MAX_AMPDU_LEN_FACTOR as 20 to calculate max_ampdu length.
+ * If a HE STA that does not send VHT cap, but HE and HT cap in assoc
+ * request, then use MAX_AMPDU_LEN_FACTOR as 16 to calculate max_ampdu
+ * length.
+ */
+ ampdu_factor = (he_cap->he_cap_elem.mac_cap_info[3] &
+ IEEE80211_HE_MAC_CAP3_MAX_AMPDU_LEN_EXP_MASK) >>
+ IEEE80211_HE_MAC_CAP3_MAX_AMPDU_LEN_EXP_SHIFT;
+
+ if (ampdu_factor) {
+ if (sta->vht_cap.vht_supported)
+ arg->peer_max_mpdu = (1 << (IEEE80211_HE_VHT_MAX_AMPDU_FACTOR +
+ ampdu_factor)) - 1;
+ else if (sta->ht_cap.ht_supported)
+ arg->peer_max_mpdu = (1 << (IEEE80211_HE_HT_MAX_AMPDU_FACTOR +
+ ampdu_factor)) - 1;
+ }
+
if (he_cap->he_cap_elem.phy_cap_info[6] &
IEEE80211_HE_PHY_CAP6_PPE_THRESHOLD_PRESENT) {
int bit = 7;
--
1.9.1
