[PATCH 0/7] Draft, incomplete series introducing state migration

[Stefano Brivio <sbrivio@redhat.com>]

This is obviously incomplete. I have code on top of this,
not really working yet, with a loop on transferred flows,
and an implementation matching passt-repair, requesting to
enable/disable the TCP_REPAIR option as needed, as well as
setting/receiving sequences.

I'm sending this for early review/rework/rewrite/whatever.
What's here should all be tested and working.

Adding:

	{ &flow_first_free,		sizeof(flow_first_free) },
	{ flowtab,			sizeof(flowtab) },

to data version 1 in 6/7 will properly transfer those sections.

Declaring functions and assigning pointers such as:

	{ flow_migrate_source_pre,	NULL },

	{ flow_migrate_source_post,	NULL },

	{ flow_migrate_target_post_v1,	NULL },

also executes them. The passt-repair helper in 7/7 is (lightly)
tested against a stand-alone source/target implementation which
I'll share in a bit.


Stefano Brivio (7):
  icmp, udp: Pad time_t timestamp to 64-bit to ease state migration
  flow, flow_table: Pad flow table entries to 128 bytes, hash entries to
    32 bits
  tcp_conn: Avoid 7-bit hole in struct tcp_splice_conn
  flow_table: Use size in extern declaration for flowtab
  util: Add read_remainder() and read_all_buf()
  Introduce facilities for guest migration on top of vhost-user
    infrastructure
  Introduce passt-repair

 Makefile       |  22 +++--
 flow.h         |  18 ++--
 flow_table.h   |  15 ++-
 icmp_flow.h    |   6 +-
 migrate.c      | 259 +++++++++++++++++++++++++++++++++++++++++++++++++
 migrate.h      |  90 +++++++++++++++++
 passt-repair.c | 111 +++++++++++++++++++++
 passt.c        |   2 +-
 tcp_conn.h     |   2 +-
 udp_flow.h     |   6 +-
 util.c         |  70 +++++++++++++
 util.h         |   2 +
 vu_common.c    | 122 +++++++++++++++--------
 vu_common.h    |   2 +-
 14 files changed, 662 insertions(+), 65 deletions(-)
 create mode 100644 migrate.c
 create mode 100644 migrate.h
 create mode 100644 passt-repair.c

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2.43.0