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    tcp: Extend SOF_TIMESTAMPING_RX_SOFTWARE to TCP recvmsg · 98aaa913
    Mike Maloney 提交于
    When SOF_TIMESTAMPING_RX_SOFTWARE is enabled for tcp sockets, return the
    timestamp corresponding to the highest sequence number data returned.
    
    Previously the skb->tstamp is overwritten when a TCP packet is placed
    in the out of order queue.  While the packet is in the ooo queue, save the
    timestamp in the TCB_SKB_CB.  This space is shared with the gso_*
    options which are only used on the tx path, and a previously unused 4
    byte hole.
    
    When skbs are coalesced either in the sk_receive_queue or the
    out_of_order_queue always choose the timestamp of the appended skb to
    maintain the invariant of returning the timestamp of the last byte in
    the recvmsg buffer.
    Signed-off-by: NMike Maloney <maloney@google.com>
    Acked-by: NWillem de Bruijn <willemb@google.com>
    Signed-off-by: NDavid S. Miller <davem@davemloft.net>
    98aaa913
tcp.c 91.1 KB