FLOW_DIS_CFM_MDL_MASK
key->cfm.mdl_ver = FIELD_PREP(FLOW_DIS_CFM_MDL_MASK, level);
mask->cfm.mdl_ver = FLOW_DIS_CFM_MDL_MASK;
if (FIELD_GET(FLOW_DIS_CFM_MDL_MASK, mask->mdl_ver)) {
mdl = FIELD_GET(FLOW_DIS_CFM_MDL_MASK, key->mdl_ver);