I40E_GLLAN_TXPRE_QDIS
reg_val = rd32(hw, I40E_GLLAN_TXPRE_QDIS(reg_block));
wr32(hw, I40E_GLLAN_TXPRE_QDIS(reg_block), reg_val);
val = rd32(hw, I40E_GLLAN_TXPRE_QDIS(reg_block));
wr32(hw, I40E_GLLAN_TXPRE_QDIS(reg_block), val);