WX_MAC_RX_FLOW_CTRL
wr32m(wx, WX_MAC_RX_FLOW_CTRL,
mflcn_reg = rd32(wx, WX_MAC_RX_FLOW_CTRL);
wr32(wx, WX_MAC_RX_FLOW_CTRL, mflcn_reg);
fc = rd32(wx, WX_MAC_RX_FLOW_CTRL);
wr32(wx, WX_MAC_RX_FLOW_CTRL, fc);