According to below comments:

class/subclass is the obseleted key word in VFR file. It is designed in framework HII. After convert to UEFI HII, it is not used any longer. Now remove them from VFR Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17493 6f19259b-4bc3-4df7-8a09-765794883524
It looks like the bug in edk2 network. Loop in HII expert(Bi Dandan) to confirm that. If yes, please report Bugzilla for that.

Thanks,
Jiaxin


From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Sivaraman Nainar
Sent: Tuesday, December 24, 2019 5:45 PM
To: Fu, Siyuan <siyuan.fu@intel.com>; devel@edk2.groups.io; Wu, Jiaxin <jiaxin.wu@intel.com>
Cc: Ramesh R. <rameshr@ami.com>
Subject: [edk2-devel] reg: Remove Framework HII "class\subclass" in all VFR

Hello Jiaxin:

Edk2 older branch removed the "class\subclass" in all VFR in the Network Stack modules. (IP4, IP6 and ISCSI) Refer below commit.

https://github.com/tianocore/edk2/commit/b965bd99c533b24bec56647a8c9b1fa2c2ed8bd8#diff-3d9f695b702160a70a74145d12121272

But when we upload the Initial IP4Dxe the changes are reverted. But IP6Config and ISCSI modules are not having those.

https://github.com/tianocore/edk2/commit/1f6729ffe98095107ce82e67a4a0209674601a90#diff-6788a5f6871902342bd0ea72eb123df4

Do we have any specific reason behind that.

-Siva