integrate librte_ipsec SAD into ipsec-secgw

This series integrates SA database (SAD) capabilities from ipsec library. The goal is to make ipsec-secgw RFC compliant regarding inbound SAD. Also patch series removes hardcoded limitation for maximum number of SA's and SP's.
According to our measurements, after this series of patches, ipsec-secgw performance drops by about 0-2%.

v6:
- add SA check for NULL pointer after rte_ipsec_sad_lookup()
- using mbuf ptype field to distinguish v4 and v6 packets
- add SAD cache size option into documentation

v5:
- introduce SAD cache to solve performance degradation
- ipsec_sad_add() returns an error if the key is present

v4:
- put tunnel SA's into SAD with SPI_ONLY type for performance reason

v3:
- parse SA and SP into sorted array instead of linked list

v2:
- get rid of maximum sp limitation

Vladimir Medvedkin (8):
ipsec: move ipsec sad name length into .h examples/ipsec-secgw: implement inbound SAD examples/ipsec-secgw: integrate inbound SAD examples/ipsec-secgw: get rid of maximum sa limitation examples/ipsec-secgw: get rid of maximum sp limitation examples/ipsec-secgw: add SAD cache examples/ipsec-secgw: set/use mbuf ptype
doc: update ipsec-secgw guide

 doc/guides/sample_app_ug/ipsec_secgw.rst |   6 +
 examples/ipsec-secgw/Makefile            |   1 +
 examples/ipsec-secgw/ipsec-secgw.c       |  36 ++++-
 examples/ipsec-secgw/ipsec.h             |  12 +-
 examples/ipsec-secgw/meson.build         |   2 +-
 examples/ipsec-secgw/parser.c            |   4 +
 examples/ipsec-secgw/parser.h            |   9 ++
 examples/ipsec-secgw/sa.c                | 238 ++++++++++++++++++-------------
 examples/ipsec-secgw/sad.c               | 149 +++++++++++++++++++
 examples/ipsec-secgw/sad.h               | 170 ++++++++++++++++++++++
 examples/ipsec-secgw/sp4.c               | 114 +++++++++++----
 examples/ipsec-secgw/sp6.c               | 112 +++++++++++----
 lib/librte_ipsec/ipsec_sad.c             |  20 +--
 lib/librte_ipsec/rte_ipsec_sad.h         |   2 +
 14 files changed, 696 insertions(+), 179 deletions(-)
 create mode 100644 examples/ipsec-secgw/sad.c
 create mode 100644 examples/ipsec-secgw/sad.h

2.7.4