Merge branch 'mlxsw-Add-support-for-egress-and-policy-based-sampling'

Ido Schimmel says:

====================
mlxsw: Add support for egress and policy-based sampling

So far mlxsw only supported ingress sampling using matchall classifier.
This series adds support for egress sampling and policy-based sampling
using flower classifier on Spectrum-2 and newer ASICs. As such, it is
now possible to issue these commands:

 # tc filter add dev swp1 egress pref 1 proto all matchall action sample rate 100 group 1

 # tc filter add dev swp2 ingress pref 1 proto ip flower dst_ip 198.51.100.1 action sample rate 100 group 2

When performing egress sampling (using either matchall or flower) the
ASIC is able to report the end-to-end latency which is passed to the
psample module.

Series overview:

Patches #1-#3 are preparations without any functional changes

Patch #4 generalizes the idea of sampling triggers and creates a hash
table to track active sampling triggers in preparation for egress and
policy-based triggers. The motivation is explained in the changelog

Patch #5 flips mlxsw to start using this hash table instead of storing
ingress sampling triggers as an attribute of the sampled port

Patch #6 finally adds support for egress sampling using matchall
classifier

Patches #7-#8 add support for policy-based sampling using flower
classifier

Patches #9 extends the mlxsw sampling selftest to cover the new triggers

Patch #10 makes sure that egress sampling configuration only fails on
Spectrum-1
====================

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

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