qtnfmac: add support for 4addr mode

Advertise WIPHY_FLAG_4ADDR_STATION capability to wireless core. Send
use4addr interface change flag to firmware in change_virtual_intf
cfg80211 callback.

In order to enable adding wireless station interface to bridge
one should turn on 4addr mode using the following command:
$ iw dev wlan0 set 4addr on
$ brctl addif br0 wlan0

If this commands succeeds, then interface can be added to bridge.
Note that when wireless interface is added to bridge, wpa_supplicant
should be started with appropriate -b <brname> parameter, e.g:
$ wpa_supplicant -Dnl80211 -iwlan0 -c/path/to/wpa.conf -b br0

Signed-off-by: Sergey Matyukevich <sergey.matyukevich.os@quantenna.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/quantenna/qtnfmac/cfg80211.c

@@ -122,7 +122,8 @@ qtnf_change_virtual_intf(struct wiphy *wiphy,
 			 struct vif_params *params)
 {
 	struct qtnf_vif *vif = qtnf_netdev_get_priv(dev);
-	u8 *mac_addr;
+	u8 *mac_addr = NULL;
+	int use4addr = 0;
 	int ret;
 
 	ret = qtnf_validate_iface_combinations(wiphy, vif, type);
@@ -132,14 +133,14 @@ qtnf_change_virtual_intf(struct wiphy *wiphy,
 		return ret;
 	}
 
-	if (params)
+	if (params) {
 		mac_addr = params->macaddr;
-	else
+		use4addr = params->use_4addr;
-		mac_addr = NULL;
+	}
 
 	qtnf_scan_done(vif->mac, true);
 
-	ret = qtnf_cmd_send_change_intf_type(vif, type, mac_addr);
+	ret = qtnf_cmd_send_change_intf_type(vif, type, use4addr, mac_addr);
 	if (ret) {
 		pr_err("VIF%u.%u: failed to change type to %d\n",
 		       vif->mac->macid, vif->vifid, type);
@@ -190,6 +191,7 @@ static struct wireless_dev *qtnf_add_virtual_intf(struct wiphy *wiphy,
 	struct qtnf_wmac *mac;
 	struct qtnf_vif *vif;
 	u8 *mac_addr = NULL;
+	int use4addr = 0;
 	int ret;
 
 	mac = wiphy_priv(wiphy);
@@ -225,10 +227,12 @@ static struct wireless_dev *qtnf_add_virtual_intf(struct wiphy *wiphy,
 		return ERR_PTR(-ENOTSUPP);
 	}
 
-	if (params)
+	if (params) {
 		mac_addr = params->macaddr;
+		use4addr = params->use_4addr;
+	}
 
-	ret = qtnf_cmd_send_add_intf(vif, type, mac_addr);
+	ret = qtnf_cmd_send_add_intf(vif, type, use4addr, mac_addr);
 	if (ret) {
 		pr_err("VIF%u.%u: failed to add VIF %pM\n",
 		       mac->macid, vif->vifid, mac_addr);
@@ -1107,7 +1111,8 @@ int qtnf_wiphy_register(struct qtnf_hw_info *hw_info, struct qtnf_wmac *mac)
 	wiphy->flags |= WIPHY_FLAG_HAVE_AP_SME |
 			WIPHY_FLAG_AP_PROBE_RESP_OFFLOAD |
 			WIPHY_FLAG_AP_UAPSD |
-			WIPHY_FLAG_HAS_CHANNEL_SWITCH;
+			WIPHY_FLAG_HAS_CHANNEL_SWITCH |
+			WIPHY_FLAG_4ADDR_STATION;
 	wiphy->flags &= ~WIPHY_FLAG_PS_ON_BY_DEFAULT;
 
 	if (hw_info->hw_capab & QLINK_HW_CAPAB_DFS_OFFLOAD)

drivers/net/wireless/quantenna/qtnfmac/commands.c

@@ -734,6 +734,7 @@ out:
 
 static int qtnf_cmd_send_add_change_intf(struct qtnf_vif *vif,
 					 enum nl80211_iftype iftype,
+					 int use4addr,
 					 u8 *mac_addr,
 					 enum qlink_cmd_type cmd_type)
 {
@@ -751,6 +752,7 @@ static int qtnf_cmd_send_add_change_intf(struct qtnf_vif *vif,
 	qtnf_bus_lock(vif->mac->bus);
 
 	cmd = (struct qlink_cmd_manage_intf *)cmd_skb->data;
+	cmd->intf_info.use4addr = use4addr;
 
 	switch (iftype) {
 	case NL80211_IFTYPE_AP:
@@ -786,17 +788,19 @@ out:
 	return ret;
 }
 
-int qtnf_cmd_send_add_intf(struct qtnf_vif *vif,
+int qtnf_cmd_send_add_intf(struct qtnf_vif *vif, enum nl80211_iftype iftype,
-			   enum nl80211_iftype iftype, u8 *mac_addr)
+			   int use4addr, u8 *mac_addr)
 {
-	return qtnf_cmd_send_add_change_intf(vif, iftype, mac_addr,
+	return qtnf_cmd_send_add_change_intf(vif, iftype, use4addr, mac_addr,
 			QLINK_CMD_ADD_INTF);
 }
 
 int qtnf_cmd_send_change_intf_type(struct qtnf_vif *vif,
-				   enum nl80211_iftype iftype, u8 *mac_addr)
+				   enum nl80211_iftype iftype,
+				   int use4addr,
+				   u8 *mac_addr)
 {
-	return qtnf_cmd_send_add_change_intf(vif, iftype, mac_addr,
+	return qtnf_cmd_send_add_change_intf(vif, iftype, use4addr, mac_addr,
 					     QLINK_CMD_CHANGE_INTF);
 }
 

drivers/net/wireless/quantenna/qtnfmac/commands.h

@@ -26,9 +26,11 @@ void qtnf_cmd_send_deinit_fw(struct qtnf_bus *bus);
 int qtnf_cmd_get_hw_info(struct qtnf_bus *bus);
 int qtnf_cmd_get_mac_info(struct qtnf_wmac *mac);
 int qtnf_cmd_send_add_intf(struct qtnf_vif *vif, enum nl80211_iftype iftype,
-			   u8 *mac_addr);
+			   int use4addr, u8 *mac_addr);
 int qtnf_cmd_send_change_intf_type(struct qtnf_vif *vif,
-				   enum nl80211_iftype iftype, u8 *mac_addr);
+				   enum nl80211_iftype iftype,
+				   int use4addr,
+				   u8 *mac_addr);
 int qtnf_cmd_send_del_intf(struct qtnf_vif *vif);
 int qtnf_cmd_band_info_get(struct qtnf_wmac *mac,
 			   struct ieee80211_supported_band *band);

drivers/net/wireless/quantenna/qtnfmac/core.c

@@ -195,6 +195,7 @@ static int qtnf_netdev_set_mac_address(struct net_device *ndev, void *addr)
 	qtnf_scan_done(vif->mac, true);
 
 	ret = qtnf_cmd_send_change_intf_type(vif, vif->wdev.iftype,
+					     vif->wdev.use_4addr,
 					     sa->sa_data);
 
 	if (ret)
@@ -545,7 +546,8 @@ static int qtnf_core_mac_attach(struct qtnf_bus *bus, unsigned int macid)
 		goto error;
 	}
 
-	ret = qtnf_cmd_send_add_intf(vif, vif->wdev.iftype, vif->mac_addr);
+	ret = qtnf_cmd_send_add_intf(vif, vif->wdev.iftype,
+				     vif->wdev.use_4addr, vif->mac_addr);
 	if (ret) {
 		pr_err("MAC%u: failed to add VIF\n", macid);
 		goto error;

drivers/net/wireless/quantenna/qtnfmac/qlink.h

@@ -105,7 +105,8 @@ struct qlink_intf_info {
 	__le16 if_type;
 	__le16 vlanid;
 	u8 mac_addr[ETH_ALEN];
-	u8 rsvd[2];
+	u8 use4addr;
+	u8 rsvd[1];
 } __packed;
 
 enum qlink_sta_flags {