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Date: Thu, 26 Mar 2026 10:27:08 -0600
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Subject: Re: [PATCH 09/11 net-next v5] bpf: remove ipv6_bpf_stub completely
 and use direct function calls
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To: Fernando Fernandez Mancera <fmancera@suse.de>,
 Martin KaFai Lau <martin.lau@linux.dev>
Cc: =?UTF-8?Q?Ricardo_B=2E_Marli=C3=A8re?= <rbm@suse.com>,
 Daniel Borkmann <daniel@iogearbox.net>, "David S. Miller"
 <davem@davemloft.net>, Eric Dumazet <edumazet@google.com>,
 Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
 Simon Horman <horms@kernel.org>, Alexei Starovoitov <ast@kernel.org>,
 Andrii Nakryiko <andrii@kernel.org>, Eduard Zingerman <eddyz87@gmail.com>,
 Song Liu <song@kernel.org>, Yonghong Song <yonghong.song@linux.dev>,
 John Fastabend <john.fastabend@gmail.com>, KP Singh <kpsingh@kernel.org>,
 Stanislav Fomichev <sdf@fomichev.me>, Hao Luo <haoluo@google.com>,
 Jiri Olsa <jolsa@kernel.org>, Ido Schimmel <idosch@nvidia.com>,
 Guillaume Nault <gnault@redhat.com>, linux-kernel@vger.kernel.org,
 bpf@vger.kernel.org, netdev@vger.kernel.org
References: <20260325120928.15848-1-fmancera@suse.de>
 <20260325120928.15848-10-fmancera@suse.de>
 <1ff47530-44ee-4012-a013-0202182de208@linux.dev>
 <99c37135-a1cc-4eb9-a910-ca38e129b5b0@suse.de>
 <93822084-f558-4194-be2b-cb328b81e412@kernel.org>
 <77792d0f-925f-4600-913c-b9dcdf8e9ea9@suse.de>
From: David Ahern <dsahern@kernel.org>
In-Reply-To: <77792d0f-925f-4600-913c-b9dcdf8e9ea9@suse.de>
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On 3/25/26 5:41 PM, Fernando Fernandez Mancera wrote:
> Hi David, I did the following testing:
> 
> 1. ipv6.disabled=1 since booting - the IPv6 nexthop cannot be added to
> the IPv4 route at all.
> 
> 2. ipv6.disabled=1 after booting but before configuring the IPv4 route -
> same result as above.
> 
> 3. ipv6.disabled=1 after booting and after the IPv4 is configured - the
> neighbor lookup is fine as the nd_tbl is initialized. It didn't crash.
> 
> I did tracing to make sure that code path was hit. I tested the
> forwarding with 3 namespaces 1<-->2<-->3 loading the BPF program on the
> second one performing the bpf_fib_lookup() instruction.
> 
> I could do more testing regarding this if needed, let me know.
> 

that looks good. Thank you