[Design] how to find BMC exposed NIC in BIOS?

[nicklela]

In our current implementation, we use MAC address to identify Redfish network interface. However, from OpenBMC implementation, the MAC on host side is different from the MAC on BMC side. BMC engineer suggest us to use VID and DID in order to identify the network interface on BMC.

SMBIOS type 42 provides this information as below

If this is the case, we need to update RedfishConfigHandler driver.

[nicklela]

We probably still use MAC address because network protocol can only provide MAC address of NIC. MAC address is defined in Host Interface specification so we can use this.

[nicklela]

action item: OpenBMC may not have implementation of "Serial Number" or "MAC Address"

[nicklela]

action: check and see if vendor id and product id can be retrieved from standard IPMI command or not.

[changab]

Locate all EFI Device Path Protocol
Check if both USB device path and MAC device path specified in the EFI Device Path
If yes, get the MAC address from EFI Device Path
Go through all IPMI channels,
Send IPMI NetFn: Net Parameter selector:5 Get MAC address)
Compare the MAC address specified in EFI Device Path ( Step 2) and the one retrieved via step 4.
If matched, this is the USB NIC exposed by BMC.