[PATCH 1/6] mt76: mt7921: fix inappropriate WoW setup with the missing ARP informaiton

[<sean.wang@xxxxxxxxxxxx>]

From: Sean Wang <sean.wang@xxxxxxxxxxxx>

Fix the Wake-on-WoWLAN failure should rely on ARP Information is being
updated in time to the firmware.

Fixes: ffa1bf97425b ("mt76: mt7921: introduce PM support")
Signed-off-by: Sean Wang <sean.wang@xxxxxxxxxxxx>
---
 .../net/wireless/mediatek/mt76/mt7921/main.c  |  3 ++
 .../net/wireless/mediatek/mt76/mt7921/mcu.c   | 44 +++++++++++++++++++
 .../wireless/mediatek/mt76/mt7921/mt7921.h    |  3 ++
 3 files changed, 50 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/main.c b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
index 06a47cab494e..32b1cd0bca1f 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
@@ -626,6 +626,9 @@ static void mt7921_bss_info_changed(struct ieee80211_hw *hw,
 	if (changed & BSS_CHANGED_ASSOC)
 		mt7921_bss_bcnft_apply(dev, vif, info->assoc);
 
+	if (changed & BSS_CHANGED_ARP_FILTER)
+		mt7921_mcu_update_arp_filter(hw, vif, info);
+
 	mt7921_mutex_release(dev);
 }
 
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
index 9283f9865ad5..353877f1c762 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
@@ -1325,3 +1325,47 @@ mt7921_pm_interface_iter(void *priv, u8 *mac, struct ieee80211_vif *vif)
 		mt76_clear(dev, MT_WF_RFCR(0), MT_WF_RFCR_DROP_OTHER_BEACON);
 	}
 }
+
+int mt7921_mcu_update_arp_filter(struct ieee80211_hw *hw,
+				 struct ieee80211_vif *vif,
+				 struct ieee80211_bss_conf *info)
+{
+	struct mt7921_vif *mvif = (struct mt7921_vif *)vif->drv_priv;
+	struct mt7921_dev *dev = mt7921_hw_dev(hw);
+	struct sk_buff *skb;
+	int i, len = min_t(int, info->arp_addr_cnt,
+			   IEEE80211_BSS_ARP_ADDR_LIST_LEN);
+	struct {
+		struct {
+			u8 bss_idx;
+			u8 pad[3];
+		} __packed hdr;
+		struct mt76_connac_arpns_tlv arp;
+	} req_hdr = {
+		.hdr = {
+			.bss_idx = mvif->mt76.idx,
+		},
+		.arp = {
+			.tag = cpu_to_le16(UNI_OFFLOAD_OFFLOAD_ARP),
+			.len = cpu_to_le16(sizeof(struct mt76_connac_arpns_tlv)),
+			.ips_num = len,
+			.mode = 2,  /* update */
+			.option = 1,
+		},
+	};
+
+	skb = mt76_mcu_msg_alloc(&dev->mt76, NULL,
+				 sizeof(req_hdr) + len * sizeof(__be32));
+	if (!skb)
+		return -ENOMEM;
+
+	skb_put_data(skb, &req_hdr, sizeof(req_hdr));
+	for (i = 0; i < len; i++) {
+		u8 *addr = (u8 *)skb_put(skb, sizeof(__be32));
+
+		memcpy(addr, &info->arp_addr_list[i], sizeof(__be32));
+	}
+
+	return mt76_mcu_skb_send_msg(&dev->mt76, skb, MCU_UNI_CMD_OFFLOAD,
+				     true);
+}
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h b/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h
index 5cedefc41416..ebe51017dd55 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h
@@ -348,4 +348,7 @@ int mt7921_mac_set_beacon_filter(struct mt7921_phy *phy,
 				 bool enable);
 void mt7921_pm_interface_iter(void *priv, u8 *mac, struct ieee80211_vif *vif);
 void mt7921_coredump_work(struct work_struct *work);
+int mt7921_mcu_update_arp_filter(struct ieee80211_hw *hw,
+				 struct ieee80211_vif *vif,
+				 struct ieee80211_bss_conf *info);
 #endif
-- 
2.25.1