ENC_OPTS_BITS_MASK
(TUNNEL_ID_MASK & ~ENC_OPTS_BITS_MASK);
u32 enc_opts_id = flow->attr->tunnel_id & ENC_OPTS_BITS_MASK;
sz_enc_opts, ENC_OPTS_BITS_MASK - 2,
enc_opts_id = tunnel_id & ENC_OPTS_BITS_MASK;