net: neigh: add skb drop reasons to arp_error_report()
When neighbour become invalid or destroyed, neigh_invalidate() will be called. neigh->ops->error_report() will be called if the neighbour's state is NUD_FAILED, and seems here is the only use of error_report(). So we can tell that the reason of skb drops in arp_error_report() is SKB_DROP_REASON_NEIGH_FAILED. Replace kfree_skb() used in arp_error_report() with kfree_skb_reason(). Reviewed-by: Mengen Sun <mengensun@tencent.com> Reviewed-by: Hao Peng <flyingpeng@tencent.com> Signed-off-by: Menglong Dong <imagedong@tencent.com> Reviewed-by: David Ahern <dsahern@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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