SKB_DROP_REASON_QUEUE_PURGE
skb_queue_purge_reason(&rq->skb_queue, SKB_DROP_REASON_QUEUE_PURGE);
__skb_queue_purge_reason(list, SKB_DROP_REASON_QUEUE_PURGE);
skb_queue_purge_reason(list, SKB_DROP_REASON_QUEUE_PURGE);
kfree_skb_reason(skb, SKB_DROP_REASON_QUEUE_PURGE);