mlxsw: spectrum: qdiscs: Update backlog handling of a child qdiscs
When removing a child qdisc its backlog will be decreased from the parent backlog. The driver backlog count should do the same. When the parent changes its configuration, the child might need to clean its stats. However, the backlog can't be cleaned with the rest of the stats, because it reflects a momentary value that needs to be synced with the core, not the history of the qdisc. Signed-off-by: NNogah Frankel <nogahf@mellanox.com> Reviewed-by: NYuval Mintz <yuvalm@mellanox.com> Signed-off-by: NJiri Pirko <jiri@mellanox.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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