net: dsa: refactor matchall mirred action to separate function

Make room for other actions for the matchall filter by keeping the
mirred argument parsing self-contained in its own function.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/dsa/slave.c

@@ -842,24 +842,27 @@ dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
 	return NULL;
 }
 
-static int dsa_slave_add_cls_matchall(struct net_device *dev,
+static int
+dsa_slave_add_cls_matchall_mirred(struct net_device *dev,
 				  struct tc_cls_matchall_offload *cls,
 				  bool ingress)
 {
 	struct dsa_port *dp = dsa_slave_to_port(dev);
 	struct dsa_slave_priv *p = netdev_priv(dev);
+	struct dsa_mall_mirror_tc_entry *mirror;
 	struct dsa_mall_tc_entry *mall_tc_entry;
-	__be16 protocol = cls->common.protocol;
 	struct dsa_switch *ds = dp->ds;
 	struct flow_action_entry *act;
 	struct dsa_port *to_dp;
-	int err = -EOPNOTSUPP;
+	int err;
+
+	act = &cls->rule->action.entries[0];
 
 	if (!ds->ops->port_mirror_add)
 		return err;
 
-	if (!flow_offload_has_one_action(&cls->rule->action))
-		return err;
+	if (!act->dev)
+		return -EINVAL;
 
 	if (!flow_action_basic_hw_stats_check(&cls->rule->action,
 					      cls->common.extack))
@@ -867,12 +870,6 @@ static int dsa_slave_add_cls_matchall(struct net_device *dev,
 
 	act = &cls->rule->action.entries[0];
 
-	if (act->id == FLOW_ACTION_MIRRED && protocol == htons(ETH_P_ALL)) {
-		struct dsa_mall_mirror_tc_entry *mirror;
-
-		if (!act->dev)
-			return -EINVAL;
-
 	if (!dsa_slave_dev_check(act->dev))
 		return -EOPNOTSUPP;
 
@@ -896,9 +893,22 @@ static int dsa_slave_add_cls_matchall(struct net_device *dev,
 	}
 
 	list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
-	}
 
-	return 0;
+	return err;
+}
+
+static int dsa_slave_add_cls_matchall(struct net_device *dev,
+				      struct tc_cls_matchall_offload *cls,
+				      bool ingress)
+{
+	int err = -EOPNOTSUPP;
+
+	if (cls->common.protocol == htons(ETH_P_ALL) &&
+	    flow_offload_has_one_action(&cls->rule->action) &&
+	    cls->rule->action.entries[0].id == FLOW_ACTION_MIRRED)
+		err = dsa_slave_add_cls_matchall_mirred(dev, cls, ingress);
+
+	return err;
 }
 
 static void dsa_slave_del_cls_matchall(struct net_device *dev,