Commit bf3c032b authored by Fan Yu's avatar Fan Yu Committed by Jakub Kicinski
Browse files

net/sched: Add precise drop reason for pfifo_fast queue overflows 



Currently, packets dropped by pfifo_fast due to queue overflow are
marked with a generic SKB_DROP_REASON_QDISC_DROP in __dev_xmit_skb().

This patch adds explicit drop reason SKB_DROP_REASON_QDISC_OVERLIMIT
for queue-full cases, providing better distinction from other qdisc drops.

Signed-off-by: default avatarFan Yu <fan.yu9@zte.com.cn>
Reviewed-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
Link: https://patch.msgid.link/20250724212837119BP9HOs0ibXDRWgsXMMir7@zte.com.cn


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent fad4df29

net/sched/sch_generic.c

+2 −0
Original line number Diff line number Diff line
@@ -740,6 +740,8 @@ static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc *qdisc, 
	err = skb_array_produce(q, skb);



	if (unlikely(err)) {

		tcf_set_drop_reason(skb, SKB_DROP_REASON_QDISC_OVERLIMIT);



		if (qdisc_is_percpu_stats(qdisc))

			return qdisc_drop_cpu(skb, qdisc, to_free);

		else