mlx4_tunnel_mad
sizeof (struct mlx4_tunnel_mad) : sizeof (struct mlx4_mad_rcv_buf);
struct mlx4_tunnel_mad *tunnel = tun_qp->ring[wr_ix].addr;
sizeof (struct mlx4_tunnel_mad),
rx_buf_size = sizeof (struct mlx4_tunnel_mad);
rx_buf_size = sizeof (struct mlx4_tunnel_mad);