[PATCH v3 00/16] Introduce unified flow table, first steps

[David Gibson <david@gibson.dropbear.id.au>]

Here's my latest revision of some of the basics of the flow table.  So
far it's basically just a renaming of the existing TCP connection
table, along with some associated helpers.  It's used for some new
logging infrastructure, but otherwise doesn't really function any
differently.

However, this subset of the flow table work no longer bloats
flow/connection entries over a single cache line.  That removes the
most prominent drawback of earlier revisions, meaning I think this
series is ready for merge now.  Doing so will mean the later series
making more substantive changes to the flow behaviour are simpler.

Tested on top of the patch updating shell prompt escape handling, but
should be independent of it.

Changes since v2:
 * Added a patch to only use C11 static_assert(), not C23
   static_assert() (needed for next change) [1/16]
 * Better handling of the bounds on valid values of enum flow_type
   [2/16]
 * No longer introduce an additional C23 style static_assert() [8/16]
 * Add fix for overly long guestfish commands (needed for next change)
   [13/16]
 * Added a patch supporting names for pifs [14/16]
 * Added patches with some further TCP reworks in preparation for the
   general flow table [15-16/16]
Changes since v1:
 * Removed a inaccurate stale comment
 * Added doc comment to FLOW() macro
 * Added new patches cleaning up signedness of 'side' variables
 * Added new patches introducing "sidx"s (flow+side indices)

David Gibson (16):
  treewide: Add messages to static_assert() calls
  flow, tcp: Generalise connection types
  flow, tcp: Move TCP connection table to unified flow table
  flow, tcp: Consolidate flow pointer<->index helpers
  util: MAX_FROM_BITS() should be unsigned
  flow: Make unified version of flow table compaction
  flow, tcp: Add logging helpers for connection related messages
  flow: Introduce 'sidx' type to represent one side of one flow
  tcp: Remove unneccessary bounds check in tcp_timer_handler()
  flow,tcp: Generalise TCP epoll_ref to generic flows
  tcp_splice: Use unsigned to represent side
  flow,tcp: Use epoll_ref type including flow and side
  test: Avoid hitting guestfish command length limits
  pif: Add helpers to get the name of a pif
  tcp: "TCP" hash secret doesn't need to be TCP specific
  tcp: Don't defer hash table removal

 Makefile                   |  15 +-
 flow.c                     |  86 +++++++++++
 flow.h                     |  74 ++++++++++
 flow_table.h               |  86 +++++++++++
 inany.h                    |   6 +-
 passt.c                    |  40 ++++++
 passt.h                    |  15 +-
 pif.c                      |  21 +++
 pif.h                      |  19 +++
 tcp.c                      | 288 ++++++++++++++++---------------------
 tcp.h                      |   7 -
 tcp_conn.h                 |  46 ++----
 tcp_splice.c               | 128 +++++++----------
 tcp_splice.h               |   2 +-
 test/prepare-distro-img.sh |   2 +-
 util.h                     |   2 +-
 16 files changed, 540 insertions(+), 297 deletions(-)
 create mode 100644 flow.c
 create mode 100644 flow.h
 create mode 100644 flow_table.h
 create mode 100644 pif.c

-- 
2.43.0