From the source code of the mgbe controller driver in drivers/net/ethernet/nvidia/nvethernet/ether_linux.c, it is understood that in the USXGMII 10G PHY interface mode, the PHY line side only supports link rates of 10G/5G/2.5G. The PHY in XFI mode we are using only supports link rates of 2.5G/5G, whereas in the USXGMII mode can support link rates of 100M/1G/2.5G/5G. How should this PHY be configured to enable the XFI data line to support 100M and 1G link rates?
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