netdev - Re: [PATCH bpf-next/net v2 0/7] bpf: Add mptcp_subflow bpf

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Message-ID: <6645ad6e-8874-44c5-8730-854c30673218@linux.dev>
Date: Thu, 16 Jan 2025 16:06:17 -0800
From: Martin KaFai Lau <martin.lau@...ux.dev>
To: Matthieu Baerts <matttbe@...nel.org>
Cc: Alexei Starovoitov <ast@...nel.org>,
 Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>,
 Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>,
 Yonghong Song <yonghong.song@...ux.dev>,
 John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>,
 Stanislav Fomichev <sdf@...ichev.me>, Hao Luo <haoluo@...gle.com>,
 Jiri Olsa <jolsa@...nel.org>, Mykola Lysenko <mykolal@...com>,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
 linux-kselftest@...r.kernel.org, Martin KaFai Lau <martin.lau@...nel.org>,
 mptcp@...ts.linux.dev, Mat Martineau <martineau@...nel.org>,
 Geliang Tang <geliang@...nel.org>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>,
 Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH bpf-next/net v2 0/7] bpf: Add mptcp_subflow bpf_iter
 support

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.