Re: reg: MAC address could not change on pre-boot environment and failed to PXE boot.

["Rabeda, Maciej" <maciej.rabeda@intel.com>]

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Hi Nainar,


  1.  Snp->StationAddress() calls UNDI->StationAddress(). Is there a guarantee that the UNDI driver you are using will persist the configuration across driver reloads / platform reboots? If there is no such guarantee, you should not reconnect UNDI driver - else the setting is lost.
  2.  Ipconfig interfaces with Ip4Config2 protocol to obtain MAC address to display.

Check "HwAddress" field in "EFI_IP4_CONFIG2_INTERFACE_INFO" structure.

It is initialized in the Ip4Dxe driver, in Ip4Config2InitIfInfo(). If you follow Ip4Config2InitIfInfo() upwards the stack, you will see that it gets called in Ip4Dxe DriverBinding->Start() function.

What I would suggest is to only reconnect SNP driver.

Thanks,
Maciej

From: Sivaraman Nainar <sivaramann@ami.com>
Sent: Friday, March 24, 2023 5:22 AM
To: devel@edk2.groups.io; Maciej Rabeda <maciej.rabeda@linux.intel.com>; Rabeda, Maciej <maciej.rabeda@intel.com>; Santhosh Kumar V <santhoshkumarv@ami.com>; Raj V Akilan <rajva@ami.com>
Subject: reg: MAC address could not change on pre-boot environment and failed to PXE boot.

Hello :

We are writing a application to program the MAC from UEFI shell and with the updated MAC address trying to do the PXE Boot which failed.

The application uses the Simple Network Protocols StationAddress() to update the MAC. After update the Current Address in the Mode of SimpleNetwork Interface updated to new MAC address. If we performed IfConfigl -l command the updated MAC not showing. Also in this environment PXE boot also got failed.

To bind the updated MAC, tried giving "reconnect -r" from UEFI shell after running test application and performed PXE boot. With On board Network controller (Intel I219), the MAC address updated in Snp->Mode->CurrentAddress is reverted back to older MAC address.  If reconnect not performed, the MAC Address changing but PXE Failed to boot.

Can someone comment if the method to update the MAC is correct or we missing something.

Thanks
Siva
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