linux-kernel - Re: [PATCH net-next 00/11] mptcp: PM listener events + selftests cleanup

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Date:   Thu, 1 Dec 2022 20:09:53 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Matthieu Baerts <matthieu.baerts@...sares.net>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        Paolo Abeni <pabeni@...hat.com>, Shuah Khan <shuah@...nel.org>,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        mptcp@...ts.linux.dev, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 00/11] mptcp: PM listener events + selftests
 cleanup

On Wed, 30 Nov 2022 15:06:22 +0100 Matthieu Baerts wrote:
> Thanks to the patch 6/11, the MPTCP path manager now sends Netlink events when
> MPTCP listening sockets are created and closed. The reason why it is needed is
> explained in the linked ticket [1]:
> 
>   MPTCP for Linux, when not using the in-kernel PM, depends on the userspace PM
>   to create extra listening sockets before announcing addresses and ports. Let's
>   call these "PM listeners".
> 
>   With the existing MPTCP netlink events, a userspace PM can create PM listeners
>   at startup time, or in response to an incoming connection. Creating sockets in
>   response to connections is not optimal: ADD_ADDRs can't be sent until the
>   sockets are created and listen()ed, and if all connections are closed then it
>   may not be clear to the userspace PM daemon that PM listener sockets should be
>   cleaned up.
> 
>   Hence this feature request: to add MPTCP netlink events for listening socket
>   close & create, so PM listening sockets can be managed based on application
>   activity.
> 
>   [1] https://github.com/multipath-tcp/mptcp_net-next/issues/313
> 
> Selftests for these new Netlink events have been added in patches 9,11/11.
> 
> The remaining patches introduce different cleanups and small improvements in
> MPTCP selftests to ease the maintenance and the addition of new tests.

Also could you warp you cover letters at 72 characters?
I need to reflow them before I can read them :(