• Soheil Hassas Yeganeh's avatar
    sock: enable timestamping using control messages · c14ac945
    Soheil Hassas Yeganeh authored
    Currently, SOL_TIMESTAMPING can only be enabled using setsockopt.
    This is very costly when users want to sample writes to gather
    tx timestamps.
    
    Add support for enabling SO_TIMESTAMPING via control messages by
    using tsflags added in `struct sockcm_cookie` (added in the previous
    patches in this series) to set the tx_flags of the last skb created in
    a sendmsg. With this patch, the timestamp recording bits in tx_flags
    of the skbuff is overridden if SO_TIMESTAMPING is passed in a cmsg.
    
    Please note that this is only effective for overriding the recording
    timestamps flags. Users should enable timestamp reporting (e.g.,
    SOF_TIMESTAMPING_SOFTWARE | SOF_TIMESTAMPING_OPT_ID) using
    socket options and then should ask for SOF_TIMESTAMPING_TX_*
    using control messages per sendmsg to sample timestamps for each
    write.
    Signed-off-by: default avatarSoheil Hassas Yeganeh <soheil@google.com>
    Acked-by: default avatarWillem de Bruijn <willemb@google.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    c14ac945
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