wifi: mt76: mt7915: fix monitor mode issues

Enable receiving other-unicast packets
Disable RX header translation in order to proprerly receive data packets.
Fixes warnings and missed packets when rx decap offload is enabled
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7915/main.c

@@ -483,16 +483,22 @@ static int mt7915_config(struct ieee80211_hw *hw, u32 changed)
 	if (changed & IEEE80211_CONF_CHANGE_MONITOR) {
 		bool enabled = !!(hw->conf.flags & IEEE80211_CONF_MONITOR);
 		bool band = phy->mt76->band_idx;
+		u32 rxfilter = phy->rxfilter;
 
-		if (!enabled)
-			phy->rxfilter |= MT_WF_RFCR_DROP_OTHER_UC;
-		else
-			phy->rxfilter &= ~MT_WF_RFCR_DROP_OTHER_UC;
+		if (!enabled) {
+			rxfilter |= MT_WF_RFCR_DROP_OTHER_UC;
+			dev->monitor_mask &= ~BIT(band);
+		} else {
+			rxfilter &= ~MT_WF_RFCR_DROP_OTHER_UC;
+			dev->monitor_mask |= BIT(band);
+		}
 
 		mt76_rmw_field(dev, MT_DMA_DCR0(band), MT_DMA_DCR0_RXD_G5_EN,
 			       enabled);
+		mt76_rmw_field(dev, MT_DMA_DCR0(band), MT_MDP_DCR0_RX_HDR_TRANS_EN,
+			       !dev->monitor_mask);
 		mt76_testmode_reset(phy->mt76, true);
-		mt76_wr(dev, MT_WF_RFCR(band), phy->rxfilter);
+		mt76_wr(dev, MT_WF_RFCR(band), rxfilter);
 	}
 
 	mutex_unlock(&dev->mt76.mutex);
@@ -527,6 +533,7 @@ static void mt7915_configure_filter(struct ieee80211_hw *hw,
 			MT_WF_RFCR1_DROP_BA |
 			MT_WF_RFCR1_DROP_CFEND |
 			MT_WF_RFCR1_DROP_CFACK;
+	u32 rxfilter;
 	u32 flags = 0;
 
 #define MT76_FILTER(_flag, _hw) do {					\
@@ -561,7 +568,12 @@ static void mt7915_configure_filter(struct ieee80211_hw *hw,
 			     MT_WF_RFCR_DROP_NDPA);
 
 	*total_flags = flags;
-	mt76_wr(dev, MT_WF_RFCR(band), phy->rxfilter);
+	rxfilter = phy->rxfilter;
+	if (hw->conf.flags & IEEE80211_CONF_MONITOR)
+		rxfilter &= ~MT_WF_RFCR_DROP_OTHER_UC;
+	else
+		rxfilter |= MT_WF_RFCR_DROP_OTHER_UC;
+	mt76_wr(dev, MT_WF_RFCR(band), rxfilter);
 
 	if (*total_flags & FIF_CONTROL)
 		mt76_clear(dev, MT_WF_RFCR1(band), ctl_flags);

drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h

@@ -295,6 +295,8 @@ struct mt7915_dev {
 	bool muru_debug;
 	bool ibf;
 
+	u8 monitor_mask;
+
 	struct dentry *debugfs_dir;
 	struct rchan *relay_fwlog;
 

drivers/net/wireless/mediatek/mt76/mt7915/regs.h

@@ -172,6 +172,7 @@ enum offs_rev {
 
 #define MT_MDP_DCR0			MT_MDP(0x000)
 #define MT_MDP_DCR0_DAMSDU_EN		BIT(15)
+#define MT_MDP_DCR0_RX_HDR_TRANS_EN	BIT(19)
 
 #define MT_MDP_DCR1			MT_MDP(0x004)
 #define MT_MDP_DCR1_MAX_RX_LEN		GENMASK(15, 3)