wifi: mt76: mt7996: enable BSS_CHANGED_MU_GROUPS support

The Group ID Management frame is an Action frame of category VHT.
It is transmitted by the AP to assign or change the user position
of a STA for one or more group IDs.

Also, sniffer can use a given group id to monitor STA that belongs
to that group.
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7996/init.c

@@ -183,6 +183,7 @@ mt7996_init_wiphy(struct ieee80211_hw *hw)
 	wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_FILS_DISCOVERY);
 	wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_ACK_SIGNAL_SUPPORT);
 	wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_CAN_REPLACE_PTK0);
+	wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_MU_MIMO_AIR_SNIFFER);
 
 	if (!mdev->dev->of_node ||
 	    !of_property_read_bool(mdev->dev->of_node,

drivers/net/wireless/mediatek/mt76/mt7996/main.c

@@ -530,6 +530,26 @@ mt7996_get_rates_table(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 	return mvif->basic_rates_idx;
 }
 
+static void
+mt7996_update_mu_group(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
+		       struct ieee80211_bss_conf *info)
+{
+	struct mt7996_vif *mvif = (struct mt7996_vif *)vif->drv_priv;
+	struct mt7996_dev *dev = mt7996_hw_dev(hw);
+	u8 band = mvif->mt76.band_idx;
+	u32 *mu;
+
+	mu = (u32 *)info->mu_group.membership;
+	mt76_wr(dev, MT_WF_PHYRX_BAND_GID_TAB_VLD0(band), mu[0]);
+	mt76_wr(dev, MT_WF_PHYRX_BAND_GID_TAB_VLD1(band), mu[1]);
+
+	mu = (u32 *)info->mu_group.position;
+	mt76_wr(dev, MT_WF_PHYRX_BAND_GID_TAB_POS0(band), mu[0]);
+	mt76_wr(dev, MT_WF_PHYRX_BAND_GID_TAB_POS1(band), mu[1]);
+	mt76_wr(dev, MT_WF_PHYRX_BAND_GID_TAB_POS2(band), mu[2]);
+	mt76_wr(dev, MT_WF_PHYRX_BAND_GID_TAB_POS3(band), mu[3]);
+}
+
 static void mt7996_bss_info_changed(struct ieee80211_hw *hw,
 				    struct ieee80211_vif *vif,
 				    struct ieee80211_bss_conf *info,
@@ -602,6 +622,9 @@ static void mt7996_bss_info_changed(struct ieee80211_hw *hw,
 	    changed & BSS_CHANGED_FILS_DISCOVERY)
 		mt7996_mcu_beacon_inband_discov(dev, vif, changed);
 
+	if (changed & BSS_CHANGED_MU_GROUPS)
+		mt7996_update_mu_group(hw, vif, info);
+
 	mutex_unlock(&dev->mt76.mutex);
 }
 

drivers/net/wireless/mediatek/mt76/mt7996/regs.h

@@ -557,22 +557,29 @@ enum base_rev {
 
 #define MT_PCIE1_MAC_INT_ENABLE			MT_PCIE1_MAC(0x188)
 
+/* PHYRX CSD */
+#define MT_WF_PHYRX_CSD_BASE			0x83000000
+#define MT_WF_PHYRX_CSD(_band, _wf, ofs)	(MT_WF_PHYRX_CSD_BASE + \
+						 ((_band) << 20) + \
+						 ((_wf) << 16) + (ofs))
+#define MT_WF_PHYRX_CSD_IRPI(_band, _wf)	MT_WF_PHYRX_CSD(_band, _wf, 0x1000)
+
 /* PHYRX CTRL */
 #define MT_WF_PHYRX_BAND_BASE			0x83080000
 #define MT_WF_PHYRX_BAND(_band, ofs)		(MT_WF_PHYRX_BAND_BASE + \
 						 ((_band) << 20) + (ofs))
 
+#define MT_WF_PHYRX_BAND_GID_TAB_VLD0(_band)	MT_WF_PHYRX_BAND(_band, 0x1054)
+#define MT_WF_PHYRX_BAND_GID_TAB_VLD1(_band)	MT_WF_PHYRX_BAND(_band, 0x1058)
+#define MT_WF_PHYRX_BAND_GID_TAB_POS0(_band)	MT_WF_PHYRX_BAND(_band, 0x105c)
+#define MT_WF_PHYRX_BAND_GID_TAB_POS1(_band)	MT_WF_PHYRX_BAND(_band, 0x1060)
+#define MT_WF_PHYRX_BAND_GID_TAB_POS2(_band)	MT_WF_PHYRX_BAND(_band, 0x1064)
+#define MT_WF_PHYRX_BAND_GID_TAB_POS3(_band)	MT_WF_PHYRX_BAND(_band, 0x1068)
+
 #define MT_WF_PHYRX_BAND_RX_CTRL1(_band)	MT_WF_PHYRX_BAND(_band, 0x2004)
 #define MT_WF_PHYRX_BAND_RX_CTRL1_IPI_EN	GENMASK(2, 0)
 #define MT_WF_PHYRX_BAND_RX_CTRL1_STSCNT_EN	GENMASK(11, 9)
 
-/* PHYRX CSD */
-#define MT_WF_PHYRX_CSD_BASE			0x83000000
-#define MT_WF_PHYRX_CSD(_band, _wf, ofs)	(MT_WF_PHYRX_CSD_BASE + \
-						 ((_band) << 20) + \
-						 ((_wf) << 16) + (ofs))
-#define MT_WF_PHYRX_CSD_IRPI(_band, _wf)	MT_WF_PHYRX_CSD(_band, _wf, 0x1000)
-
 /* PHYRX CSD BAND */
 #define MT_WF_PHYRX_CSD_BAND_RXTD12(_band)		MT_WF_PHYRX_BAND(_band, 0x8230)
 #define MT_WF_PHYRX_CSD_BAND_RXTD12_IRPI_SW_CLR_ONLY	BIT(18)