There are a number of things that are more-or-less general to flows
which are still explicitly handled in tcp.c and tcp_splice.c including
allocation and freeing of flow entries, and dispatch of deferred and
timer functions.
Even without adding more fields to the common flow structure, we can
handle a number of these in a more flow-centric way.
Unlike v1 this version is based on the hash table rework series.
Changes since v3:
* Rebased on current tree, plus patches for some test failures
* Renamed "free blocks" to "free clusters" in flow allocation scheme
* Fixed bug where we wouldn't properly merge adjacent free clusters
together during deferred handling
* Improved theory of operation comments about flow allocation scheme
Changes since v2:
* Realised the prealloc/commit functions where confusing and worked
poorly for some future stuff. Replaced with alloc/alloc_cancel
* Fixed a bug where newly allocated flow entries might not be
0-filled, because of the free tracking information in there. This
could cause very subtle problems.
Changes since v1:
* Store the timestamp of last flow timers run in a global, rather
than a ctx field
* Rebased on the TCP hash table rework
* Add patches 9..13/13 with changes to allocation and freeing of flow
entries.
David Gibson (13):
flow: Make flow_table.h #include the protocol specific headers it
needs
treewide: Standardise on 'now' for current timestamp variables
tcp, tcp_splice: Remove redundant handling from tcp_timer()
tcp, tcp_splice: Move per-type cleanup logic into per-type helpers
flow, tcp: Add flow-centric dispatch for deferred flow handling
flow, tcp: Add handling for per-flow timers
epoll: Better handling of number of epoll types
tcp, tcp_splice: Avoid double layered dispatch for connected TCP
sockets
flow: Move flow_log_() to near top of flow.c
flow: Move flow_count from context structure to a global
flow: Abstract allocation of new flows with helper function
flow: Enforce that freeing of closed flows must happen in deferred
handlers
flow: Avoid moving flow entries to compact table
flow.c | 235 +++++++++++++++++++++++++++++++++++++++++++--------
flow.h | 5 +-
flow_table.h | 20 +++++
icmp.c | 12 +--
icmp.h | 2 +-
log.c | 34 ++++----
passt.c | 20 +++--
passt.h | 9 +-
tcp.c | 143 +++++++++----------------------
tcp.h | 2 +-
tcp_conn.h | 8 +-
tcp_splice.c | 49 +++++------
tcp_splice.h | 4 +-
udp.c | 16 ++--
udp.h | 2 +-
15 files changed, 339 insertions(+), 222 deletions(-)
--
2.43.0