+config MLXBF_GIGE
+	tristate "Mellanox Technologies BlueField Gigabit Ethernet support"
+	depends on (ARM64 || COMPILE_TEST) && ACPI && INET
+	select PHYLIB
+	help
+	  The second generation BlueField SoC from Mellanox Technologies
+	  supports an out-of-band Gigabit Ethernet management port to the
+	  Arm subsystem.

You might want to additionally select the PHY driver you are using.

    Andrew