mlx4_net_trans_rule_hw_ipv4
sizeof(struct mlx4_net_trans_rule_hw_ipv4),
struct mlx4_net_trans_rule_hw_ipv4 *ip_header;
(struct mlx4_net_trans_rule_hw_ipv4 *)(eth_header + 1);
struct mlx4_net_trans_rule_hw_ipv4 ipv4;