recipes-wifi/linux-mt76/files/patches-3.x/0111-mtk-wifi-mt76-mt7996-enable-ampdu-limit-to-avoid-BA-.patch

From 20695a924111dee64fb9fa5d8c4996f2333b4aee Mon Sep 17 00:00:00 2001
From: Peter Chiu <chui-hao.chiu@mediatek.com>
Date: Mon, 1 Apr 2024 17:00:21 +0800
Subject: [PATCH 111/116] mtk: wifi: mt76: mt7996: enable ampdu limit to avoid
 BA bound issue

[Description]
When the station is MTK device and the peak is higher than 15G, the PPS
would exceed HW-RRO's bandwidth and lead to Rx fifo full and PER. When
a link occurs PER, it may occupy SSN and the other two bands are not
able to transmit.

Limit AMPDU to 512 when satisify all of the following conditions
1. BA winsize is 1024.
2. At least one link use BW320 and its spatial stream is larger
than 3.
3. At least one link use BW160 and its spatial stream is larger
than 3.

By limiting AMPDU to 512, it can solve this issue.
1. Reduce PPS so we can avoid Rx fifo full due to HW-RRO.
2. If a bind occupy SSN, the other two bands can use the SSN
between 512 to 1024.

[Release-log]
N/A

Signed-off-by: Peter Chiu <chui-hao.chiu@mediatek.com>
---
 mt76_connac_mcu.h |  1 +
 mt7996/mcu.c      | 86 +++++++++++++++++++++++++++++++++++++++++++++++
 mt7996/mcu.h      |  8 +++++
 3 files changed, 95 insertions(+)

diff --git a/mt76_connac_mcu.h b/mt76_connac_mcu.h
index 4d0fd4b..1c8e503 100644
--- a/mt76_connac_mcu.h
+++ b/mt76_connac_mcu.h
@@ -821,6 +821,7 @@ enum {
 	STA_REC_KEY_V3 = 0x27,
 	STA_REC_HDRT = 0x28,
 	STA_REC_HDR_TRANS = 0x2B,
+	STA_REC_TX_CAP = 0x2f,
 	STA_REC_MAX_NUM
 };
 
diff --git a/mt7996/mcu.c b/mt7996/mcu.c
index 895ec3e..3f51c28 100644
--- a/mt7996/mcu.c
+++ b/mt7996/mcu.c
@@ -1344,6 +1344,85 @@ mt7996_mcu_sta_ba(struct mt7996_dev *dev, struct mt76_vif *mvif,
 				     MCU_WMWA_UNI_CMD(STA_REC_UPDATE), true);
 }
 
+static int
+mt7996_mcu_sta_tx_cap(struct mt7996_dev *dev, struct mt76_vif *mvif,
+		      struct mt76_wcid *wcid)
+{
+	struct sta_rec_tx_cap *tx_cap;
+	struct sk_buff *skb;
+	struct tlv *tlv;
+
+	skb = __mt76_connac_mcu_alloc_sta_req(&dev->mt76, mvif, wcid,
+					      MT7996_STA_UPDATE_MAX_SIZE);
+	if (IS_ERR(skb))
+		return PTR_ERR(skb);
+
+	tlv = mt76_connac_mcu_add_tlv(skb, STA_REC_TX_CAP, sizeof(*tx_cap));
+
+	tx_cap = (struct sta_rec_tx_cap *)tlv;
+	tx_cap->ampdu_limit_en = true;
+
+	dev_info(dev->mt76.dev, "%s: limit wcid %d ampdu to 512\n", __func__, wcid->idx);
+
+	return mt76_mcu_skb_send_msg(&dev->mt76, skb,
+				     MCU_WMWA_UNI_CMD(STA_REC_UPDATE), true);
+}
+
+static bool mt7996_check_limit_ampdu_en(struct ieee80211_ampdu_params *params) {
+	struct ieee80211_sta *sta = params->sta;
+	struct mt7996_sta *msta = (struct mt7996_sta *)sta->drv_priv;
+	unsigned long valid_links = sta->valid_links ?: BIT(0);
+	unsigned int link_id;
+	bool BW320 = false, BW160 = false;
+
+	if (params->buf_size < 1024)
+		return false;
+
+	for_each_set_bit(link_id, &valid_links, IEEE80211_MLD_MAX_NUM_LINKS) {
+		struct ieee80211_link_sta __rcu *link =
+			link_sta_dereference_protected(sta, link_id);
+		struct mt7996_bss_conf *mconf =
+			mconf_dereference_protected(msta->vif, link_id);
+		struct mt76_phy *phy = mconf->phy->mt76;
+		struct ieee80211_eht_mcs_nss_supp_bw *ss = NULL;
+		u8 sta_bw, ap_nss, sta_nss;
+
+		switch (phy->chandef.width) {
+		case NL80211_CHAN_WIDTH_160:
+			if (link->bandwidth >= IEEE80211_STA_RX_BW_160) {
+				ss = &link->eht_cap.eht_mcs_nss_supp.bw._160;
+				sta_bw = NL80211_CHAN_WIDTH_160;
+			}
+			break;
+		case NL80211_CHAN_WIDTH_320:
+			if (link->bandwidth == IEEE80211_STA_RX_BW_320) {
+				ss = &link->eht_cap.eht_mcs_nss_supp.bw._320;
+				sta_bw = NL80211_CHAN_WIDTH_320;
+			}
+			break;
+		default:
+			break;
+		}
+
+		if (!ss)
+			continue;
+
+		ap_nss = hweight8(phy->antenna_mask);
+		sta_nss = max(u8_get_bits(ss->rx_tx_mcs11_max_nss, IEEE80211_EHT_MCS_NSS_RX),
+			      u8_get_bits(ss->rx_tx_mcs13_max_nss, IEEE80211_EHT_MCS_NSS_RX));
+
+		if (min(ap_nss, sta_nss) <= 2)
+			continue;
+
+		if (sta_bw == NL80211_CHAN_WIDTH_160)
+			BW160 = true;
+		else if (sta_bw == NL80211_CHAN_WIDTH_320)
+			BW320 = true;
+	}
+
+	return BW320 && BW160;
+}
+
 /** starec & wtbl **/
 int mt7996_mcu_add_tx_ba(struct mt7996_dev *dev,
 			 struct ieee80211_ampdu_params *params,
@@ -1353,6 +1432,7 @@ int mt7996_mcu_add_tx_ba(struct mt7996_dev *dev,
 	struct mt7996_sta *msta = (struct mt7996_sta *)sta->drv_priv;
 	unsigned long valid_links = sta->valid_links ?: BIT(0);
 	unsigned int link_id;
+	bool limit_ampdu_en = mt7996_check_limit_ampdu_en(params);
 
 	for_each_set_bit(link_id, &valid_links, IEEE80211_MLD_MAX_NUM_LINKS) {
 		struct mt7996_link_sta *mlink =
@@ -1368,6 +1448,12 @@ int mt7996_mcu_add_tx_ba(struct mt7996_dev *dev,
 					&mlink->wcid, enable, true);
 		if (ret)
 			return ret;
+
+		if (limit_ampdu_en) {
+			ret = mt7996_mcu_sta_tx_cap(dev, &mconf->mt76, &mlink->wcid);
+			if (ret)
+				return ret;
+		}
 	}
 
 	return 0;
diff --git a/mt7996/mcu.h b/mt7996/mcu.h
index 3d5a0c3..a1ac18f 100644
--- a/mt7996/mcu.h
+++ b/mt7996/mcu.h
@@ -579,6 +579,13 @@ struct sta_rec_ba_uni {
 	u8 __rsv[3];
 } __packed;
 
+struct sta_rec_tx_cap {
+	__le16 tag;
+	__le16 len;
+	u8 ampdu_limit_en;
+	u8 rsv[3];
+} __packed;
+
 struct sta_rec_eht {
 	__le16 tag;
 	__le16 len;
@@ -945,6 +952,7 @@ enum {
 					 sizeof(struct sta_rec_eht) +		\
 					 sizeof(struct sta_rec_hdrt) +		\
 					 sizeof(struct sta_rec_hdr_trans) +	\
+					 sizeof(struct sta_rec_tx_cap) +	\
 					 sizeof(struct tlv))
 
 #define MT7996_MAX_BEACON_SIZE		1338
-- 
2.18.0