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

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Date: Thu, 23 May 2024 10:59:58 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Willem de Bruijn <willemdebruijn.kernel@...il.com>, 
 Lena Wang (王娜) <Lena.Wang@...iatek.com>, 
 "kuba@...nel.org" <kuba@...nel.org>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, 
 Shiming Cheng (成诗明) <Shiming.Cheng@...iatek.com>, 
 "pabeni@...hat.com" <pabeni@...hat.com>, 
 "edumazet@...gle.com" <edumazet@...gle.com>, 
 "willemdebruijn.kernel@...il.com" <willemdebruijn.kernel@...il.com>, 
 "netdev@...r.kernel.org" <netdev@...r.kernel.org>, 
 "matthias.bgg@...il.com" <matthias.bgg@...il.com>, 
 "davem@...emloft.net" <davem@...emloft.net>
Subject: Re: [PATCH net] net: prevent pulling SKB_GSO_FRAGLIST skb

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