net: marvell: prestera: Refactor router functions

* Reverse xmas tree variables order
* User friendly messages on error paths
* Refactor __prestera_inetaddr_event to use early return
Signed-off-by: Yevhen Orlov <yevhen.orlov@plvision.eu>
Link: https://lore.kernel.org/r/20220111011051.4941-1-yevhen.orlov@plvision.euSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/marvell/prestera/prestera_hw.c

@@ -1831,8 +1831,8 @@ static int prestera_iface_to_msg(struct prestera_iface *iface,
 int prestera_hw_rif_create(struct prestera_switch *sw,
 			   struct prestera_iface *iif, u8 *mac, u16 *rif_id)
 {
-	struct prestera_msg_rif_req req;
 	struct prestera_msg_rif_resp resp;
+	struct prestera_msg_rif_req req;
 	int err;
 
 	memcpy(req.mac, mac, ETH_ALEN);
@@ -1868,9 +1868,9 @@ int prestera_hw_rif_delete(struct prestera_switch *sw, u16 rif_id,
 
 int prestera_hw_vr_create(struct prestera_switch *sw, u16 *vr_id)
 {
-	int err;
 	struct prestera_msg_vr_resp resp;
 	struct prestera_msg_vr_req req;
+	int err;
 
 	err = prestera_cmd_ret(sw, PRESTERA_CMD_TYPE_ROUTER_VR_CREATE,
 			       &req.cmd, sizeof(req), &resp.ret, sizeof(resp));

drivers/net/ethernet/marvell/prestera/prestera_router.c

@@ -25,10 +25,10 @@ static int __prestera_inetaddr_port_event(struct net_device *port_dev,
 					  struct netlink_ext_ack *extack)
 {
 	struct prestera_port *port = netdev_priv(port_dev);
-	int err;
-	struct prestera_rif_entry *re;
 	struct prestera_rif_entry_key re_key = {};
+	struct prestera_rif_entry *re;
 	u32 kern_tb_id;
+	int err;
 
 	err = prestera_is_valid_mac_addr(port, port_dev->dev_addr);
 	if (err) {
@@ -45,21 +45,21 @@ static int __prestera_inetaddr_port_event(struct net_device *port_dev,
 	switch (event) {
 	case NETDEV_UP:
 		if (re) {
-			NL_SET_ERR_MSG_MOD(extack, "rif_entry already exist");
+			NL_SET_ERR_MSG_MOD(extack, "RIF already exist");
 			return -EEXIST;
 		}
 		re = prestera_rif_entry_create(port->sw, &re_key,
 					       prestera_fix_tb_id(kern_tb_id),
 					       port_dev->dev_addr);
 		if (!re) {
-			NL_SET_ERR_MSG_MOD(extack, "Can't create rif_entry");
+			NL_SET_ERR_MSG_MOD(extack, "Can't create RIF");
 			return -EINVAL;
 		}
 		dev_hold(port_dev);
 		break;
 	case NETDEV_DOWN:
 		if (!re) {
-			NL_SET_ERR_MSG_MOD(extack, "rif_entry not exist");
+			NL_SET_ERR_MSG_MOD(extack, "Can't find RIF");
 			return -EEXIST;
 		}
 		prestera_rif_entry_destroy(port->sw, re);
@@ -75,11 +75,11 @@ static int __prestera_inetaddr_event(struct prestera_switch *sw,
 				     unsigned long event,
 				     struct netlink_ext_ack *extack)
 {
-	if (prestera_netdev_check(dev) && !netif_is_bridge_port(dev) &&
-	    !netif_is_lag_port(dev) && !netif_is_ovs_port(dev))
-		return __prestera_inetaddr_port_event(dev, event, extack);
-
+	if (!prestera_netdev_check(dev) || netif_is_bridge_port(dev) ||
+	    netif_is_lag_port(dev) || netif_is_ovs_port(dev))
 		return 0;
+
+	return __prestera_inetaddr_port_event(dev, event, extack);
 }
 
 static int __prestera_inetaddr_cb(struct notifier_block *nb,
@@ -126,6 +126,8 @@ static int __prestera_inetaddr_valid_cb(struct notifier_block *nb,
 		goto out;
 
 	if (ipv4_is_multicast(ivi->ivi_addr)) {
+		NL_SET_ERR_MSG_MOD(ivi->extack,
+				   "Multicast addr on RIF is not supported");
 		err = -EINVAL;
 		goto out;
 	}

drivers/net/ethernet/marvell/prestera/prestera_router_hw.c

@@ -123,7 +123,7 @@ __prestera_rif_entry_key_copy(const struct prestera_rif_entry_key *in,
 		out->iface.vlan_id = in->iface.vlan_id;
 		break;
 	default:
-		pr_err("Unsupported iface type");
+		WARN(1, "Unsupported iface type");
 		return -EINVAL;
 	}