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Don't use IFQ_ENQUEUE/IFQ_DEQUEUE in the MP-ified interface without whole lock.
That causes reoder per flow, as there can be below situation
(1) CPU#A does IFQ_DEQUEUE
(2) CPU#A sleeps by some reason
(3) CPU#B does IFQ_DEQUEUE
That causes reoder per flow, as there can be below situation
(1) CPU#A does IFQ_DEQUEUE
(2) CPU#A sleeps by some reason
(3) CPU#B does IFQ_DEQUEUE