Hello Yann,
Thank you for posting your issue on the Mellanox Community.
Based on the information provided and the information from the f/w release notes, we had an internal sync. regarding the current capabilities of this Dell OEM Mellanox Connect-X 6 VPI adapter.
Based on the current f/w 20.26.4300, this adapter is currently only capable of InfiniBand. The Ethernet capability will be available in the upcoming Dell OEM f/w 20.27.xxxx. Currently Dell is certifying this f/w. For availability, please reach out to Dell Support.
The information provided in the current f/w header and RN is not correct, and will be corrected.
For further information regarding the capabilities specific for the Dell OEM Mellanox ConnectX-6 adapter, please reach out to Dell Support.
Thank you,
~Mellanox Technical Support