Link to the BZ where this missing feature was reported as a bug: https://bugzilla.redhat.com/show_bug.cgi?id=1842887

When implemented this will need to be validated with RHCOS as well so that it can be leveraged for OpenShift installations.

Hi,

recent GRUB from git://git.savannah.gnu.org/grub.git contains patches to read and use VLAN tag automatically.
I was able to boot in a tagged VLAN using this recent version of grub.
If needed I will post all steps needed to boot anaconda installer.

Hi Guido,
yes, please do post all the steps here. That should accelerate (!) things.

First of all some configurations are hard coded to simplify and speed up things.
All was done on a Fedora 36 laptopo with gcc, make installed. Sorry I cannot
list all packages required to build grub, because everything was already installed.

This is what I did:

Clone from git://git.savannah.gnu.org/grub.git
Bootstrap grub: ./bootstrap
Configure grub: ./configure --prefix=/usr --sysconfdir=/etc --with-platform=efi --target=x86_64
Build: make -j2
Install in some temporary directory: export DESTDIR=/tmp/grub && make install

Now we should have a working grub installed in /tmp/grub

Build a grub image: this step has some configuration hard coded, sorry:
cd /tmp/grub
usr/bin/grub-mkimage --compress xz --disable-shim-lock -d /tmp/grub/usr/lib64/grub/x86_64-efi -o grubx64.efi -O x86_64-efi -p '(tftp)/grub' efinet serial tftp part_gpt configfile normal

This step hardcodes the prefix, that is the path grub uses to get grub.cfg

Now we have to copy things to our tftp server:
copy grubx64.efi to the root of tftp server
copy all grub modules from /tmp/grub/usr/lib64/grub/x86_64-efi to
<tftproot>/grub/x86_64-efi
I think only .mod files are really needed, but I copied all files.

Put grub.cfg in <tftproot>/grub

This was my grub.cfg:

insmod efi_gop
insmod efi_uga
insmod linux
insmod reboot

serial --speed=115200
terminal_input serial
terminal_output serial

set root=(tftp,172.22.129.141)

echo 'Loading kernel...'
linux rhel8.7/vmlinuz console=ttyS0,115200n8 vlan=vlan3457:eno1 ip=eno1:dhcp rd.luks=0 rd.md=0 rd.dm=0 rd.multipath=0 inst.repo=http://172.22.129.141/rhel8.7/ inst.ks=http://172.22.129.141/rhel8.7/ks.cfg inst.headless quiet
echo 'Loading ramdisk...'
initrd rhel8.7/initrd.img

I'm using a serial console here.

At the grub prompt run boot (this can be done from grub.cfg, but I want to launch manually)

That's all, I hope it works for you.

My machine was a dell R740xd

P.S. I did not sign the boorloader, so this does not work with secureboot, you have to disable it

There is a patchset Upstream:

https://lists.gnu.org/archive/html/grub-devel/2022-03/msg00193.html

Grub 2.12-rc1 has been released with VLAN support (commands, network and reading the VLAN from the UEFI path).

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