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Date: Thu, 16 Jan 2025 16:06:17 -0800
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Subject: Re: [PATCH bpf-next/net v2 0/7] bpf: Add mptcp_subflow bpf_iter
 support
To: Matthieu Baerts <matttbe@kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>,
 Daniel Borkmann <daniel@iogearbox.net>, 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>, Mykola Lysenko <mykolal@fb.com>,
 netdev@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org,
 linux-kselftest@vger.kernel.org, Martin KaFai Lau <martin.lau@kernel.org>,
 mptcp@lists.linux.dev, Mat Martineau <martineau@kernel.org>,
 Geliang Tang <geliang@kernel.org>, "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>,
 Shuah Khan <shuah@kernel.org>
References: <20241219-bpf-next-net-mptcp-bpf_iter-subflows-v2-0-ae244d3cdbbc@kernel.org>
 <1ff05fca-28ff-491e-ab4e-b562d310359b@kernel.org>
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From: Martin KaFai Lau <martin.lau@linux.dev>
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On 1/15/25 1:39 AM, Matthieu Baerts wrote:
>> Here is a series from Geliang, adding mptcp_subflow bpf_iter support.
>>
>> We are working on extending MPTCP with BPF, e.g. to control the path
>> manager -- in charge of the creation, deletion, and announcements of
>> subflows (paths) -- and the packet scheduler -- in charge of selecting
>> which available path the next data will be sent to. These extensions
>> need to iterate over the list of subflows attached to an MPTCP
>> connection, and do some specific actions via some new kfunc that will be
>> added later on.
> 
> (...)
> 
>> Changes in v2:
>> - Patches 1-2: new ones.
>> - Patch 3: remove two kfunc, more restrictions. (Martin)
>> - Patch 4: add BUILD_BUG_ON(), more restrictions. (Martin)
>> - Patch 7: adaptations due to modifications in patches 1-4.
>> - Link to v1: https://lore.kernel.org/r/20241108-bpf-next-net-mptcp-bpf_iter-subflows-v1-0-cf16953035c1@kernel.org
> 
> The v2 of this series didn't get any reviews, probably because it has
> been sent the week before Xmas. Do you prefer if I resend it?

No need to resend. will get to it.