[PATCH net v4 3/7] net: stmmac: selftests: Check the dev->features for S-TAG offload testing

The S-TAG offload insertion incorrectly checks the dvlan (double vlan)
DMA cap, which is different than S-TAG support. Use
NETIF_F_HW_VLAN_STAG_TX to check if the feature is supported instead.

Note that this flag isn't set in stmmac yet, but contrary to ARP
offload, this is a feature that has a chance to get there eventually so
let's leave the selftest here for now. It'll report -EOPNOTSUPP in the
meantime.

Fixes: 091810dbded9 ("net: stmmac: Introduce selftests support")
Reviewed-by: Nicolai Buchwitz <nb@tipi-net.de>
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c
index 2f9f7746c40a..de02c0da56dc 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c

@@ -1415,7 +1415,7 @@ static int stmmac_test_vlanoff(struct stmmac_priv *priv)
 
 static int stmmac_test_svlanoff(struct stmmac_priv *priv)
 {
-	if (!priv->dma_cap.dvlan)
+	if (!(priv->dev->features & NETIF_F_HW_VLAN_STAG_TX))
 		return -EOPNOTSUPP;
 	return stmmac_test_vlanoff_common(priv, true);
 }

-- 
2.55.0