tcp: add tcp_rtt_tsopt_us()

Before adding usec TS support, add tcp_rtt_tsopt_us() helper
to factorize code.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2023-10-20 12:57:44 +00:00 • committed by David S. Miller
commit b04c332088