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    tcp: add tcpi_bytes_received to tcp_info · bdd1f9ed
    Eric Dumazet 提交于
    This patch tracks total number of payload bytes received on a TCP socket.
    This is the sum of all changes done to tp->rcv_nxt
    
    RFC4898 named this : tcpEStatsAppHCThruOctetsReceived
    
    This is a 64bit field, and can be fetched both from TCP_INFO
    getsockopt() if one has a handle on a TCP socket, or from inet_diag
    netlink facility (iproute2/ss patch will follow)
    
    Note that tp->bytes_received was placed near tp->rcv_nxt for
    best data locality and minimal performance impact.
    Signed-off-by: NEric Dumazet <edumazet@google.com>
    Cc: Yuchung Cheng <ycheng@google.com>
    Cc: Matt Mathis <mattmathis@google.com>
    Cc: Eric Salo <salo@google.com>
    Cc: Martin Lau <kafai@fb.com>
    Cc: Chris Rapier <rapier@psc.edu>
    Acked-by: NYuchung Cheng <ycheng@google.com>
    Signed-off-by: NDavid S. Miller <davem@davemloft.net>
    bdd1f9ed
tcp.h 12.3 KB