net: stmmac: propagate feature flags to vlan

stmmac_dev_probe doesn't propagate feature flags to VLANs.  So features
like offloading don't correspond with the general features and it's not
possible to manipulate features via ethtool -K to affect VLANs.

Propagate feature flags to vlan features.  Drop TSO feature because
it does not work on VLANs yet.

Signed-off-by: Corinna Vinschen <vinschen@redhat.com>
Link: https://lore.kernel.org/r/20230417192845.590034-1-vinschen@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -7313,6 +7313,10 @@ int stmmac_dvr_probe(struct device *device,
 	if (priv->dma_cap.rssen && priv->plat->rss_en)
 		ndev->features |= NETIF_F_RXHASH;
 
+	ndev->vlan_features |= ndev->features;
+	/* TSO doesn't work on VLANs yet */
+	ndev->vlan_features &= ~NETIF_F_TSO;
+
 	/* MTU range: 46 - hw-specific max */
 	ndev->min_mtu = ETH_ZLEN - ETH_HLEN;
 	if (priv->plat->has_xgmac)