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When limit == 0, pfifo_tail_enqueue() must drop new packet and increase dropped packets count of the qdisc. All test results: 1..16 ok 1 a519 - Add bfifo qdisc with system default parameters on egress ok 2 585c - Add pfifo qdisc with system default parameters on egress ok 3 a86e - Add bfifo qdisc with system default parameters on egress with handle of maximum value ok 4 9ac8 - Add bfifo qdisc on egress with queue size of 3000 bytes ok 5 f4e6 - Add pfifo qdisc on egress with queue size of 3000 packets ok 6 b1b1 - Add bfifo qdisc with system default parameters on egress with invalid handle exceeding maximum value ok 7 8d5e - Add bfifo qdisc on egress with unsupported argument ok 8 7787 - Add pfifo qdisc on egress with unsupported argument ok 9 c4b6 - Replace bfifo qdisc on egress with new queue size ok 10 3df6 - Replace pfifo qdisc on egress with new queue size ok 11 7a67 - Add bfifo qdisc on egress with queue size in invalid format ok 12 1298 - Add duplicate bfifo qdisc on egress ok 13 45a0 - Delete nonexistent bfifo qdisc ok 14 972b - Add prio qdisc on egress with invalid format for handles ok 15 4d39 - Delete bfifo qdisc twice ok 16 d774 - Check pfifo_head_drop qdisc enqueue behaviour when limit == 0 Signed-off-by: Quang Le <quanglex97@gmail.com> Signed-off-by: Cong Wang <cong.wang@bytedance.com> Link: https://patch.msgid.link/20250204005841.223511-3-xiyou.wangcong@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>