dp_packet_clear(struct dp_packet *b)
{
    dp_packet_set_data(b, dp_packet_base(b));
    dp_packet_set_size(b, 0);
}
dp_packet_clear(struct dp_packet *b)
{
    dp_packet_set_data(b, dp_packet_base(b));
    dp_packet_set_size(b, 0);
}