use C linkage where appropriate in headers

Assure that 'extern "C" { /../ }' do not cover files included from a
particular header file, and address minor issues resulting from this
change of order.

use C linkage where appropriate in headers

Assure that 'extern "C" { /../ }' do not cover files included from a
particular header file, and address minor issues resulting from this
change of order.

Dealing with C++ should delegate to the individual include file level,
rather than being imposed by the user of that file. For example,
forcing C linkage prevents __Generic macros being replaced with
overloaded static inline functions in C++ translation units.

Eliminate 'extern "C"' from files which do not declare any symbols
(e.g., only macros or struct types).

On the other hand, the headers check is too naive in assuming that all
headers must contain a 'extern "C"'. Such a check was added in commit
1ee492bdc4ff ("buildtools/chkincs: check missing C++ guards").
Since this current change results in many headers not containing such
a token, remove the check for 'extern "C"' until we have a better
implementation.

Signed-off-by: Mattias Rönnblom <mattias.ronnblom@ericsson.com>
Acked-by: Morten Brørup <mb@smartsharesystems.com>
Signed-off-by: David Marchand <david.marchand@redhat.com>

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table: add entry ID for learner tables

Add support for unique ID for each learner table entry. The entry ID
is retrieved as part of the learner table lookup operation and is
saved by the pipeline fo

table: add entry ID for learner tables

Add support for unique ID for each learner table entry. The entry ID
is retrieved as part of the learner table lookup operation and is
saved by the pipeline for later use.

Signed-off-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>

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table: configure hash function for learner tables

Make the hash function configurable. The internal hash function that
was not configurable, mask-based and limited to 64 bytes is removed.

Signed-of

table: configure hash function for learner tables

Make the hash function configurable. The internal hash function that
was not configurable, mask-based and limited to 64 bytes is removed.

Signed-off-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>
Signed-off-by: Kamalakannan R <kamalakannan.r@intel.com>

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table: improve learner table timers

Previously, on lookup hit, the hit key had its timer automatically
rearmed with the same timeout in order to prevent its expiration. Now,
a broader set of actions

table: improve learner table timers

Previously, on lookup hit, the hit key had its timer automatically
rearmed with the same timeout in order to prevent its expiration. Now,
a broader set of actions is available on lookup hit, which has to be
managed explicitly: the key can have its timer rearmed with the same
or with a different timeout, or the key timer can be left unmodified.
The latter option allows the key to expire naturally when the timer
eventually runs out, unless the key is hit again and its timer rearmed
at that point. Needed by the TCP connection tracking state machine.

Signed-off-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>

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lib: remove unneeded header includes

These header includes have been flagged by the iwyu_tool
and removed.

Signed-off-by: Sean Morrissey <sean.morrissey@intel.com>

table: support learner tables

A learner table is typically used for learning or connection tracking,
where it allows for the implementation of the "add on miss" scenario:
whenever the lookup key is

table: support learner tables

A learner table is typically used for learning or connection tracking,
where it allows for the implementation of the "add on miss" scenario:
whenever the lookup key is not found in the table (lookup miss), the
data plane can decide to add this key to the table with a given action
with no control plane intervention. Likewise, the table keys expire
based on a configurable timeout and are automatically deleted from the
table with no control plane intervention.

Signed-off-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com>

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