net/mlx5e: Support partial GSO for tunnels over vlans

Offloading outer checksum on tunnels requires GSO partial, add it to
'vlan_features' to allow offloading tunnels over vlans.
For example, running GENEVE over vlan & ipv6 (mandatory UDP checksum)
now allows for hardware TSO instead of software segmentation in GSO
only.
Signed-off-by: Gal Pressman <gal@nvidia.com>
Reviewed-by: Aya Levin <ayal@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/en_main.c

@@ -4812,6 +4812,7 @@ static void mlx5e_build_nic_netdev(struct net_device *netdev)
 	netdev->vlan_features    |= NETIF_F_TSO6;
 	netdev->vlan_features    |= NETIF_F_RXCSUM;
 	netdev->vlan_features    |= NETIF_F_RXHASH;
+	netdev->vlan_features    |= NETIF_F_GSO_PARTIAL;
 
 	netdev->mpls_features    |= NETIF_F_SG;
 	netdev->mpls_features    |= NETIF_F_HW_CSUM;
@@ -4877,7 +4878,6 @@ static void mlx5e_build_nic_netdev(struct net_device *netdev)
 						NETIF_F_GSO_IPXIP6;
 	}
 
-	netdev->hw_features	                 |= NETIF_F_GSO_PARTIAL;
 	netdev->gso_partial_features             |= NETIF_F_GSO_UDP_L4;
 	netdev->hw_features                      |= NETIF_F_GSO_UDP_L4;
 	netdev->features                         |= NETIF_F_GSO_UDP_L4;