linux-kernel - Re: [PATCH bpf-next v4 0/6] XDP metadata support for tun driver

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Message-ID: <CAPpAL=wLk0Z3jfg9eY75c3ZFhH-3w7H--WqFuaGMcCJ+Bm5q+g@mail.gmail.com>
Date: Fri, 28 Feb 2025 13:43:29 +0800
From: Lei Yang <leiyang@...hat.com>
To: Marcus Wichelmann <marcus.wichelmann@...zner-cloud.de>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, bpf@...r.kernel.org, 
	linux-kselftest@...r.kernel.org, willemdebruijn.kernel@...il.com, 
	jasowang@...hat.com, andrew+netdev@...n.ch, davem@...emloft.net, 
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, ast@...nel.org, 
	daniel@...earbox.net, andrii@...nel.org, martin.lau@...ux.dev, 
	eddyz87@...il.com, song@...nel.org, yonghong.song@...ux.dev, 
	john.fastabend@...il.com, kpsingh@...nel.org, sdf@...ichev.me, 
	haoluo@...gle.com, jolsa@...nel.org, mykolal@...com, shuah@...nel.org, 
	hawk@...nel.org
Subject: Re: [PATCH bpf-next v4 0/6] XDP metadata support for tun driver

Hi Marcus

Since your patches are about the virtual network, I'd like to test it,
but it conflicts (Please review the attachment to review more details)
when I apply it to the master branch.
My test based on this commit:
commit 1e15510b71c99c6e49134d756df91069f7d18141 (origin/master, origin/HEAD)
Merge: f09d694cf799 54e1b4becf5e
Author: Linus Torvalds <torvalds@...ux-foundation.org>
Date:   Thu Feb 27 09:32:42 2025 -0800

    Merge tag 'net-6.14-rc5' of
git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

    Pull networking fixes from Jakub Kicinski:
     "Including fixes from bluetooth.

Thanks
Lei

On Thu, Feb 27, 2025 at 10:28 PM Marcus Wichelmann
<marcus.wichelmann@...zner-cloud.de> wrote:
>
> Hi all,
>
> this series contains some improvements for the selftest patches. The other
> patches remain unchanged. Please check the changelist below.
>
> I have reverted the addition of the NOARP flag from the previous version,
> as it was not effective and the CI was still failing occasionally because
> of the race condition caused by foreign packets interfering with the veth
> tests. This series contains an alternative solution by filtering all but
> the test packets using the attached XDP program.
>
> Successful pipeline:
> https://github.com/kernel-patches/bpf/actions/runs/13552017584
>
> ---
>
> v4:
> - strip unrelated changes from the selftest patches
> - extend commit message for "selftests/bpf: refactor xdp_context_functional
>   test and bpf program"
> - the NOARP flag was not effective to prevent other packets from
>   interfering with the tests, add a filter to the XDP program instead
> - run xdp_context_tuntap in a separate namespace to avoid conflicts with
>   other tests
>
> v3: https://lore.kernel.org/bpf/20250224152909.3911544-1-marcus.wichelmann@hetzner-cloud.de/
> - change the condition to handle xdp_buffs without metadata support, as
>   suggested by Willem de Bruijn <willemb@...gle.com>
> - add clarifying comment why that condition is needed
> - set NOARP flag in selftests to ensure that the kernel does not send
>   packets on the test interfaces that may interfere with the tests
>
> v2: https://lore.kernel.org/bpf/20250217172308.3291739-1-marcus.wichelmann@hetzner-cloud.de/
> - submit against bpf-next subtree
> - split commits and improved commit messages
> - remove redundant metasize check and add clarifying comment instead
> - use max() instead of ternary operator
> - add selftest for metadata support in the tun driver
>
> v1: https://lore.kernel.org/all/20250130171614.1657224-1-marcus.wichelmann@hetzner-cloud.de/
>
> Marcus Wichelmann (6):
>   net: tun: enable XDP metadata support
>   net: tun: enable transfer of XDP metadata to skb
>   selftests/bpf: move open_tuntap to network helpers
>   selftests/bpf: refactor xdp_context_functional test and bpf program
>   selftests/bpf: add test for XDP metadata support in tun driver
>   selftests/bpf: fix file descriptor assertion in open_tuntap helper
>
>  drivers/net/tun.c                             |  28 +++-
>  tools/testing/selftests/bpf/network_helpers.c |  28 ++++
>  tools/testing/selftests/bpf/network_helpers.h |   3 +
>  .../selftests/bpf/prog_tests/lwt_helpers.h    |  29 ----
>  .../bpf/prog_tests/xdp_context_test_run.c     | 138 +++++++++++++++++-
>  .../selftests/bpf/progs/test_xdp_meta.c       |  53 +++++--
>  6 files changed, 223 insertions(+), 56 deletions(-)
>
> --
> 2.43.0
>
>

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