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    [UDP]: Only increment counter on first peek/recv · a59322be
    Herbert Xu 提交于
    The previous move of the the UDP inDatagrams counter caused each
    peek of the same packet to be counted separately.  This may be
    undesirable.
    
    This patch fixes this by adding a bit to sk_buff to record whether
    this packet has already been seen through skb_recv_datagram.  We
    then only increment the counter when the packet is seen for the
    first time.
    
    The only dodgy part is the fact that skb_recv_datagram doesn't have
    a good way of returning this new bit of information.  So I've added
    a new function __skb_recv_datagram that does return this and made
    skb_recv_datagram a wrapper around it.
    
    The plan is to eventually replace all uses of skb_recv_datagram with
    this new function at which time it can be renamed its proper name.
    Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
    Signed-off-by: NDavid S. Miller <davem@davemloft.net>
    a59322be
skbuff.h 49.7 KB