[PATCH v2] ath11k: calculate the correct NSS of peer for HE capabilities

[Wen Gong <quic_wgong@quicinc.com>]

When connected to 6G mode AP, it does not have VHT/HT capabilities,
so the NSS is not set, then it is 1 by default.

This patch is to calculate the NSS with supported HE-MCS and NSS set
of HE capabilities.

Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-01280-QCAHSPSWPL_V1_V2_SILICONZ_LITE-1

Signed-off-by: Wen Gong <quic_wgong@quicinc.com>
---
v2: rebased to latest ath.git master ath-202111170737

 drivers/net/wireless/ath/ath11k/mac.c | 38 ++++++++++++++++++++++++++-
 1 file changed, 37 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath11k/mac.c b/drivers/net/wireless/ath/ath11k/mac.c
index 292b2b7eab11..580a3404dc4b 100644
--- a/drivers/net/wireless/ath/ath11k/mac.c
+++ b/drivers/net/wireless/ath/ath11k/mac.c
@@ -1920,7 +1920,6 @@ static void ath11k_peer_assoc_h_he(struct ath11k *ar,
 	struct ath11k_vif *arvif = (void *)vif->drv_priv;
 	struct cfg80211_chan_def def;
 	const struct ieee80211_sta_he_cap *he_cap = &sta->he_cap;
-	u8 ampdu_factor;
 	enum nl80211_band band;
 	u16 *he_mcs_mask;
 	u8 max_nss, he_mcs;
@@ -1928,6 +1927,9 @@ static void ath11k_peer_assoc_h_he(struct ath11k *ar,
 	int i, he_nss, nss_idx;
 	bool user_rate_valid = true;
 	u32 rx_nss, tx_nss, nss_160;
+	u8 ampdu_factor, rx_mcs_80, rx_mcs_160;
+	u16 mcs_160_map, mcs_80_map;
+	bool support_160;
 
 	if (WARN_ON(ath11k_mac_vif_chan(vif, &def)))
 		return;
@@ -1942,6 +1944,40 @@ static void ath11k_peer_assoc_h_he(struct ath11k *ar,
 		return;
 
 	arg->he_flag = true;
+	support_160 = !!(he_cap->he_cap_elem.phy_cap_info[0] &
+		  IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G);
+
+	/* Supported HE-MCS and NSS Set of peer he_cap is intersection with self he_cp */
+	mcs_160_map =
+		le16_to_cpu(he_cap->he_mcs_nss_supp.rx_mcs_160);
+	mcs_80_map = le16_to_cpu(he_cap->he_mcs_nss_supp.rx_mcs_80);
+
+	if (support_160) {
+		for (i = 7; i >= 0; i--) {
+			u8 mcs_160 = (mcs_160_map >> (2 * i)) & 3;
+
+			if (mcs_160 != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
+				rx_mcs_160 = i + 1;
+				break;
+			}
+		}
+	}
+
+	for (i = 7; i >= 0; i--) {
+		u8 mcs_80 = (mcs_80_map >> (2 * i)) & 3;
+
+		if (mcs_80 != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
+			rx_mcs_80 = i + 1;
+			break;
+		}
+	}
+
+	if (support_160)
+		max_nss = min(rx_mcs_80, rx_mcs_160);
+	else
+		max_nss = rx_mcs_80;
+
+	arg->peer_nss = min(sta->rx_nss, max_nss);
 
 	memcpy_and_pad(&arg->peer_he_cap_macinfo,
 		       sizeof(arg->peer_he_cap_macinfo),

base-commit: 63ec871bc50a306aac550e2d85f697ca2d5f5deb
-- 
2.31.1