netdev - Re: [PATCH net-next v1 5/7] selftests/net: add bpf skb forwarding program

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Message-ID: <20251121173619.32584592@kernel.org>
Date: Fri, 21 Nov 2025 17:36:19 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: David Wei <dw@...idwei.uk>
Cc: netdev@...r.kernel.org, Andrew Lunn <andrew+netdev@...n.ch>, "David S.
 Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo
 Abeni <pabeni@...hat.com>, Daniel Borkmann <daniel@...earbox.net>
Subject: Re: [PATCH net-next v1 5/7] selftests/net: add bpf skb forwarding
 program

On Fri, 21 Nov 2025 09:40:56 -0800 David Wei wrote:
> On 2025-11-20 19:20, Jakub Kicinski wrote:
> > On Wed, 19 Nov 2025 19:30:14 -0800 David Wei wrote:  
> >> This is needed for netkit container datapath selftests. Add two things:
> >>
> >>    1. nk_forward.bpf.c, a bpf program that forwards skbs matching some
> >>       IPv6 prefix received on eth0 ifindex to a specified netkit ifindex.
> >>    2. nk_forward.c, a C loader program that accepts eth0/netkit ifindex
> >>       and IPv6 prefix.
> >>
> >> Selftests will load and unload this bpf program via the loader.  
> > 
> > Is the skel stuff necessary? For XDP we populate the map with bpftool.  
> 
> I have no idea what I'm doing with bpf and was copying from
> libbpf-bootstrap :D I'll use bpftool to attach the bpf prog to tc
> ingress + set the vars. If xdp is using bpftool then I presume it is
> already a dependency on the DUT?

Yes, FWIW tools/testing/selftests/drivers/net/xdp.py is what I meant by
XDP