dp_packet_l2(const struct dp_packet *b)
{
    return (b->l3_ofs != UINT16_MAX) ? dp_packet_data(b) : NULL;
}
dp_packet_l2(const struct dp_packet *b)
{
    return (b->l3_ofs != UINT16_MAX) ? dp_packet_data(b) : NULL;
}