netdev - Re: [PATCH bpf] selftests/bpf: fix xdp_redirect xdp-features for xdp

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Date:   Fri, 14 Apr 2023 23:59:57 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Lorenzo Bianconi <lorenzo@...nel.org>, bpf@...r.kernel.org
Cc:     netdev@...r.kernel.org, lorenzo.bianconi@...hat.com,
        ast@...nel.org, andrii@...nel.org, martin.lau@...ux.dev,
        joamaki@...il.com
Subject: Re: [PATCH bpf] selftests/bpf: fix xdp_redirect xdp-features for
 xdp_bonding selftest

On 4/14/23 11:21 PM, Lorenzo Bianconi wrote:
> NETDEV_XDP_ACT_NDO_XMIT is not enabled by default for veth driver but it
> depends on the device configuration. Fix XDP_REDIRECT xdp-features in
> xdp_bonding selftest loading a dummy XDP program on veth2_2 device.
> 
> Fixes: fccca038f300 ("veth: take into account device reconfiguration for xdp_features flag")

Hm, does that mean we're changing^breaking existing user behavior iff after
fccca038f300 you can only make it work by loading dummy prog?

> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> ---
>   tools/testing/selftests/bpf/prog_tests/xdp_bonding.c | 11 +++++++++++
>   1 file changed, 11 insertions(+)
> 
> diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_bonding.c b/tools/testing/selftests/bpf/prog_tests/xdp_bonding.c
> index 5e3a26b15ec6..dcbe30c81291 100644
> --- a/tools/testing/selftests/bpf/prog_tests/xdp_bonding.c
> +++ b/tools/testing/selftests/bpf/prog_tests/xdp_bonding.c
> @@ -168,6 +168,17 @@ static int bonding_setup(struct skeletons *skeletons, int mode, int xmit_policy,
>   
>   		if (xdp_attach(skeletons, skeletons->xdp_dummy->progs.xdp_dummy_prog, "veth1_2"))
>   			return -1;
> +
> +		if (!ASSERT_OK(setns_by_name("ns_dst"), "set netns to ns_dst"))
> +			return -1;
> +
> +		/* Load a dummy XDP program on veth2_2 in order to enable
> +		 * NETDEV_XDP_ACT_NDO_XMIT feature
> +		 */
> +		if (xdp_attach(skeletons, skeletons->xdp_dummy->progs.xdp_dummy_prog, "veth2_2"))
> +			return -1;
> +
> +		restore_root_netns();
>   	}
>   
>   	SYS("ip -netns ns_dst link set veth2_1 master bond2");
>