mlxcx_completionq_doorbell_t
mlxcx_completionq_doorbell_t *mlcq_doorbell;
ASSERT3U(c->dmac_size, >=, sizeof (mlxcx_completionq_doorbell_t));
sz = sizeof (mlxcx_completionq_doorbell_t);
(mlxcx_completionq_doorbell_t *)mlcq->mlcq_doorbell_dma.mxdb_va;