linux-kernel - Re: [PATCH net] net: prevent pulling SKB_GSO

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Date: Wed, 29 May 2024 11:35:18 +0000
From: Lena Wang (王娜) <Lena.Wang@...iatek.com>
To: "kuba@...nel.org" <kuba@...nel.org>, "willemdebruijn.kernel@...il.com"
	<willemdebruijn.kernel@...il.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Shiming Cheng (成诗明)
	<Shiming.Cheng@...iatek.com>, "matthias.bgg@...il.com"
	<matthias.bgg@...il.com>, "pabeni@...hat.com" <pabeni@...hat.com>,
	"edumazet@...gle.com" <edumazet@...gle.com>, "davem@...emloft.net"
	<davem@...emloft.net>
Subject: Re: [PATCH net] net: prevent pulling SKB_GSO_FRAGLIST skb

On Thu, 2024-05-23 at 10:59 -0400, Willem de Bruijn wrote:
>  	 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>  Willem de Bruijn wrote:
> > > The problem now is the ethtool in ubuntu can't support "rx-gro-
> list"
> > > and "rx-udp-gro-forwarding" although it is updated to version 6.7
> from 
> > > https://mirrors.edge.kernel.org/pub/software/network/ethtool. 
> > > 
> > > There is another verison in 
> > > 
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/net/ethtool
> .
> > >  We download the sourcecode but don't know how to compile for
> ubuntu as
> > > no ./configure there.
> > > 
> > > Is it the one we should use?  If yes, could you please show me
> how to
> > > compile and install this ethtool?
> > 
> > https://git.kernel.org/pub/scm/network/ethtool/ethtool.git is the
> > upstream ethtool repo.
> > 
> > Since you are testing a custom built kernel, there are other hacky
> > ways to configure a feature if you lack a userspace component:
> > 
> > - just hardcode on or off and reboot
> > - use YNL ethtool (but features is not implemented yet?)
> > - write your own netlink helper
> > - abuse some existing kernel API to toggle it, like a rarely uses
> systl
> 
> And as shared off-line, virtme-ng (vng) can be a good option for
> working on tools/testing/selftests too.
> 
> Ideally
> 
> ```
> vng -v -b -f tools/testing/selftests/net
> make headers
> make -C tools/testing/selftests/net
> 
> vng -v -r arch/x86/boot/bzImage --user root
> # inside the VM
> make -C tools/testing/selftests TARGETS=net run_tests
> ```
> 
> Though last time I tried I had to use a slightly more roundabout
> 
> ```
> make defconfig; make kvm_guest.config
> ./scripts/kconfig/merge_config.sh -m .config
> tools/testing/selftests/net/config
> make olddefconfig
> make -j $(nproc) bzImage
> make headers
> make -C tools/testing/selftests/net
> 
> vng -v -r arch/x86/boot/bzImage --user root
> ```
> 
> 
> 
https://lpc.events/event/17/contributions/1506/attachments/1143/2441/virtme-ng.pdf

Dear Willem,
In https://github.com/arighi/virtme-ng it needs kernel 6.5 to setup.
Current our enviroument doesn't support and we prepare to install a PC
with a new ubuntu22.04.

Do you know any request for ubuntu version to run vng, Which version is
more fit for?

Thanks
Lena