selftests: mlxsw: Add headroom handling test
Add a test for headroom configuration. This covers projection of ETS configuration to ingress, PFC, adjustments for MTU, the qdisc / TC mode and the effect of egress SPAN session on buffer configuration. Signed-off-by: Petr Machata <petrm@nvidia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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