Firmware 2.9.1xxx is the latest/last available ConnectX-2 firmware.
Firmware 2.10.xxx is for ConnectX-3 adapters.
Proper SMB functionality/support requires ConnectX-3 adapters.
In general there was some conflicting documentation, and driver messages, in the past referencing SMB support for ConnectX-2, but you really need ConnectX-3 adapters for proper functionality.