NVME_GET_FEAT_REQ_FIELD_DPTR
req->gfr_need |= 1 << NVME_GET_FEAT_REQ_FIELD_DPTR;
req->gfr_allow |= 1 << NVME_GET_FEAT_REQ_FIELD_DPTR;
if ((req->gfr_allow & (1 << NVME_GET_FEAT_REQ_FIELD_DPTR)) == 0) {
nvme_get_feat_req_clear_need(req, NVME_GET_FEAT_REQ_FIELD_DPTR);
if ((req->gfr_allow & (1 << NVME_GET_FEAT_REQ_FIELD_DPTR)) == 0) {
nvme_get_feat_req_set_need(req, NVME_GET_FEAT_REQ_FIELD_DPTR);