Merge branch 'mlxsw-Prepare-SPAN-API-for-upcoming-changes'

Ido Schimmel says:

====================
mlxsw: Prepare SPAN API for upcoming changes

Switched port analyzer (SPAN) is used for packet mirroring. Over mlxsw
this is achieved by attaching tc-mirred action to either matchall or
flower classifier.

The current API used to configure SPAN consists of two functions:
mlxsw_sp_span_mirror_add() and mlxsw_sp_span_mirror_del().

These two functions pack a lot of different operations:

* SPAN agent configuration: Determining the egress port and optional
  headers that need to encapsulate the mirrored packet (when mirroring
  to a gretap, for example)

* Egress mirror buffer configuration: Allocating / freeing a buffer when
  port is analyzed (inspected) at egress

* SPAN agent binding: Binding the SPAN agent to a trigger, if any. The
  current triggers are incoming / outgoing packet and they are only used
  for matchall-based mirroring

This non-modular design makes it difficult to extend the API for future
changes, such as new mirror targets (CPU) and new global triggers (early
dropped packets, for example).

Therefore, this patch set gradually adds APIs for above mentioned
operations and then converts the two existing users to use it instead of
the old API. No functional changes intended. Tested with existing
mirroring selftests.

Patch set overview:

Patches #1-#5 gradually add the new API
Patches #6-#8 convert existing users to use the new API
Patch #9 removes the old API
====================

Signed-off-by: David S. Miller <davem@davemloft.net>