AX_FC_RX
pause->rx_pause = !!(ax_local->flowctrl & AX_FC_RX);
fc |= pause->rx_pause ? AX_FC_RX : 0;
maccr |= (ax_local->flowctrl & AX_FC_RX) ? MACCR_RXFC_ENABLE : 0;
maccr |= (ax_local->flowctrl & AX_FC_RX) ? MACCR_RXFC_ENABLE : 0;
ax_local->phydev->advertising) ? AX_FC_RX : 0;