[dpdk-dev] [PATCH RFC 0/2] TCP flow classification using 4-tuple and flags

[Sowmini Varadhan]

An interesting class of problems is  TCP flow tracking 
and classification based on TCP state, which  requires 
the ability to classify TCP flows on more packet properties 
than just the 4-tuple

This patch-set investigates the set of changes needed in the 
examples/flow_classify.c needed to achieve  one instance of
this class of problems by adding hooks to filter/classify 
on both the 4-tuple and tcp flags.

Patch 1 extends examples/flow_classify.c to allow constraints
on tcp flags. Patch 2 extends the ACL handling in  
librte_flow_classify to include keys on the properties in 
addition to the tcp 4-tuple.

Note that one particular part of this patch-set where feedback
is requested is in allocate_acl_ipv4_tcp_5tuple_rule():
we need to add a key for the 8 bit flags, but the multibit
trie lookup moves in steps of 4 bytes, so it took some hackery
to figure out what byte-ordering was expected, and there were
no documentation/examples to provide guidelines. Comments/suggestions
would be particularly helpful.

Sowmini Varadhan (2):
  Hooks to allow the setting of filters on tcp flags
  Allow the flow_classify example to add an ACL table for tcp.

 examples/flow_classify/flow_classify.c        | 113 ++++++++++++++++--
 examples/flow_classify/ipv4_rules_file.txt    |  22 ++--
 lib/librte_flow_classify/rte_flow_classify.c  |  84 +++++++++++++
 lib/librte_flow_classify/rte_flow_classify.h  |  19 +++
 .../rte_flow_classify_parse.c                 |   8 +-
 5 files changed, 221 insertions(+), 25 deletions(-)

-- 
2.20.1