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Add reason for skb drops to __netif_receive_skb_core() when packet_type not found to handle the skb. For this purpose, the drop reason SKB_DROP_REASON_PTYPE_ABSENT is introduced. Take ether packets for example, this case mainly happens when L3 protocol is not supported. Signed-off-by: Menglong Dong <[email protected]> Signed-off-by: David S. Miller <[email protected]>