I40E_GLLAN_TXPRE_QDIS
reg = I40E_GLLAN_TXPRE_QDIS(qid / 128);
val = ixl_rd(sc, I40E_GLLAN_TXPRE_QDIS(reg_block));
ixl_wr(sc, I40E_GLLAN_TXPRE_QDIS(reg_block), val);