tcp: timestamp SYN+DATA messages
All skb in socket write queue should be properly timestamped. In case of FastOpen, we special case the SYN+DATA 'message' as we queue in socket wrote queue the two fallback skbs: 1) SYN message by itself. 2) DATA segment by itself. We should make sure these skbs have proper timestamps. Add a WARN_ON_ONCE() to eventually catch future violations. Fixes: 740b0f18 ("tcp: switch rtt estimations to usec resolution") Signed-off-by: NEric Dumazet <edumazet@google.com> Cc: Neal Cardwell <ncardwell@google.com> Cc: Yuchung Cheng <ycheng@google.com> Acked-by: NNeal Cardwell <ncardwell@google.com> Acked-by: NYuchung Cheng <ycheng@google.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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