net: skb_drop_reason: add document for drop reasons
Add document for following existing drop reasons: SKB_DROP_REASON_NOT_SPECIFIED SKB_DROP_REASON_NO_SOCKET SKB_DROP_REASON_PKT_TOO_SMALL SKB_DROP_REASON_TCP_CSUM SKB_DROP_REASON_SOCKET_FILTER SKB_DROP_REASON_UDP_CSUM Signed-off-by: NMenglong Dong <imagedong@tencent.com> Reviewed-by: NDavid Ahern <dsahern@kernel.org> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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