tcp: add send queue size stat in SCM_TIMESTAMPING_OPT_STATS
This patch adds TCP_NLA_SENDQ_SIZE stat into SCM_TIMESTAMPING_OPT_STATS. It reports no. of bytes present in send queue, when timestamp is generated. Signed-off-by: NPriyaranjan Jha <priyarjha@google.com> Signed-off-by: NNeal Cardwell <ncardwell@google.com> Signed-off-by: NYuchung Cheng <ycheng@google.com> Signed-off-by: NSoheil Hassas Yeganeh <soheil@google.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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