net/mlx5e: Enable reporting checksum unnecessary also for L3 packets

We can report checksum unnecessary also when the L3 checksum
flag on the cqe is set and there's no L4 header.
Signed-off-by: NOr Gerlitz <ogerlitz@mellanox.com>
Reviewed-by: NTariq Toukan <tariqt@mellanox.com>
Signed-off-by: NSaeed Mahameed <saeedm@mellanox.com>

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

@@ -805,7 +805,8 @@ static inline void mlx5e_handle_csum(struct net_device *netdev,
 
 csum_unnecessary:
 	if (likely((cqe->hds_ip_ext & CQE_L3_OK) &&
-		   (cqe->hds_ip_ext & CQE_L4_OK))) {
+		   ((cqe->hds_ip_ext & CQE_L4_OK) ||
+		    (get_cqe_l4_hdr_type(cqe) == CQE_L4_HDR_TYPE_NONE)))) {
 		skb->ip_summed = CHECKSUM_UNNECESSARY;
 		if (cqe_is_tunneled(cqe)) {
 			skb->csum_level = 1;