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qdisc_tree_decrease_qlen() is called when some packets are dropped on a qdisc, and we want to notify parents of qlen changes. We also can increment parents qdisc qstats drop counters. This permits more accurate drop counters up to root qdisc. For example a graft operation typically resets a qdisc (drops all packets) and call qdisc_tree_decrease_qlen() Note that callers are responsible for their drop counters. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>