[PATCH v12 0/6] Non-draft state migration

[Stefano Brivio <sbrivio@redhat.com>]

v12:
- clean up, add comments, complete error handling
- add iperf3 test with 6 concurrent flows and migration under flood

This looks reasonably stable and polished to me, probably
enough to be merged. The behaviour now looks solid under flood,
too.

Still to do, I guess:

 1. more iperf3 tests, with IPv6, in the other direction, and
    with mixed flows

 2. support for other types of flow (assuming that we care at
    all... things already work)

 3. find a way to close the window socket-side early on, and
    reopen it in the target, to entirely avoid retransmissions.

    I can set the socket in repair mode in the source, fetch
    TCP_REPAIR_WINDOW parameters, just change rcv_wnd to 0, set
    them back, then disable repair mode. Nothing bad happens and
    the window probe from TCP_REPAIR_OFF is visible, but the
    window isn't updated, because it's not actually recalculated
    using rcv_wnd meanwhile. Dummy send/recv() calls don't really
    change things, either. But there must be some other way.

    I haven't tried doing this guest-side but that part should
    be trivial.


David Gibson (1):
  migrate: Migrate guest observed addresses

Stefano Brivio (5):
  migrate: Skeleton of live migration logic
  Add interfaces and configuration bits for passt-repair
  vhost_user: Make source quit after reporting migration state
  migrate: Migrate TCP flows
  test: Add migration tests

 Makefile                   |  14 +-
 conf.c                     |  44 ++-
 epoll_type.h               |   6 +-
 flow.c                     | 202 +++++++++++++
 flow.h                     |   6 +
 migrate.c                  | 300 +++++++++++++++++++
 migrate.h                  |  54 ++++
 passt.1                    |  11 +
 passt.c                    |  15 +-
 passt.h                    |  15 +
 repair.c                   | 211 ++++++++++++++
 repair.h                   |  16 +
 tap.c                      |  65 +----
 tcp.c                      | 583 +++++++++++++++++++++++++++++++++++++
 tcp_conn.h                 |  87 ++++++
 test/lib/layout            |  55 +++-
 test/lib/setup             | 128 ++++++++
 test/lib/test              |  48 +++
 test/migrate/basic         |  54 ++++
 test/migrate/bidirectional |  59 ++++
 test/migrate/iperf3_out4   |  42 +++
 test/run                   |  10 +
 util.c                     |  62 ++++
 util.h                     |  30 ++
 vhost_user.c               |  68 ++---
 virtio.h                   |   4 -
 vu_common.c                |  49 +---
 vu_common.h                |   2 +-
 28 files changed, 2060 insertions(+), 180 deletions(-)
 create mode 100644 migrate.c
 create mode 100644 migrate.h
 create mode 100644 repair.c
 create mode 100644 repair.h
 create mode 100644 test/migrate/basic
 create mode 100644 test/migrate/bidirectional
 create mode 100644 test/migrate/iperf3_out4

-- 
2.43.0