tcp: add bytes not sent to SCM_TIMESTAMPING_OPT_STATS
Add TCP_NLA_BYTES_NOTSENT to SCM_TIMESTAMPING_OPT_STATS that reports bytes in the write queue but not sent. This is the same metric as what is exported with tcp_info.tcpi_notsent_bytes. Signed-off-by: NYousuk Seung <ysseung@google.com> Signed-off-by: NEric Dumazet <edumazet@google.com> Acked-by: NSoheil Hassas Yeganeh <soheil@google.com> Acked-by: NYuchung Cheng <ycheng@google.com> Acked-by: NNeal Cardwell <ncardwell@google.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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