net: stmmac: selftests: Add missing checks for support of SA

Add checks for support of Source Address Insertion/Replacement before
running the test.
Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c

@@ -1057,6 +1057,9 @@ static int stmmac_test_desc_sai(struct stmmac_priv *priv)
 	struct stmmac_packet_attrs attr = { };
 	int ret;
 
+	if (!priv->dma_cap.vlins)
+		return -EOPNOTSUPP;
+
 	attr.remove_sa = true;
 	attr.sarc = true;
 	attr.src = src;
@@ -1076,6 +1079,9 @@ static int stmmac_test_desc_sar(struct stmmac_priv *priv)
 	struct stmmac_packet_attrs attr = { };
 	int ret;
 
+	if (!priv->dma_cap.vlins)
+		return -EOPNOTSUPP;
+
 	attr.sarc = true;
 	attr.src = src;
 	attr.dst = priv->dev->dev_addr;
@@ -1094,6 +1100,9 @@ static int stmmac_test_reg_sai(struct stmmac_priv *priv)
 	struct stmmac_packet_attrs attr = { };
 	int ret;
 
+	if (!priv->dma_cap.vlins)
+		return -EOPNOTSUPP;
+
 	attr.remove_sa = true;
 	attr.sarc = true;
 	attr.src = src;
@@ -1114,6 +1123,9 @@ static int stmmac_test_reg_sar(struct stmmac_priv *priv)
 	struct stmmac_packet_attrs attr = { };
 	int ret;
 
+	if (!priv->dma_cap.vlins)
+		return -EOPNOTSUPP;
+
 	attr.sarc = true;
 	attr.src = src;
 	attr.dst = priv->dev->dev_addr;