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[RFC PATCH 0/5] mptcp support

From: Dr. David Alan Gilbert (git)
Subject: [RFC PATCH 0/5] mptcp support
Date: Thu, 8 Apr 2021 20:11:54 +0100

From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

  This RFC set adds support for multipath TCP (mptcp),
in particular on the migration path - but should be extensible
to other users.

  Multipath-tcp is a bit like bonding, but at L3; you can use
it to handle failure, but can also use it to split traffic across
multiple interfaces.

  Using a pair of 10Gb interfaces, I've managed to get 19Gbps
(with the only tuning being using huge pages and turning the MTU up).

  It needs a bleeding-edge Linux kernel (in some older ones you get
false accept messages for the subflows), and a C lib that has the
constants defined (as current glibc does).

  To use it you just need to append ,mptcp to an address;

  -incoming tcp:0:4444,mptcp
  migrate -d tcp:,mptcp

  I had a quick go at trying NBD as well, but I think it needs
some work with the parsing of NBD addresses.

  All comments welcome.


Dr. David Alan Gilbert (5):
  channel-socket: Only set CLOEXEC if we have space for fds
  io/net-listener: Call the notifier during finalize
  migration: Add cleanup hook for inwards migration
  migration/socket: Close the listener at the end
  sockets: Support multipath TCP

 io/channel-socket.c   |  8 ++++----
 io/dns-resolver.c     |  2 ++
 io/net-listener.c     |  3 +++
 migration/migration.c |  3 +++
 migration/migration.h |  4 ++++
 migration/multifd.c   |  5 +++++
 migration/socket.c    | 24 ++++++++++++++++++------
 qapi/sockets.json     |  5 ++++-
 util/qemu-sockets.c   | 34 ++++++++++++++++++++++++++++++++++
 9 files changed, 77 insertions(+), 11 deletions(-)


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