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tcp: add SRTT to SCM_TIMESTAMPING_OPT_STATS

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Add TCP_NLA_SRTT to SCM_TIMESTAMPING_OPT_STATS that reports the smoothed
round trip time in microseconds (tcp_sock.srtt_us >> 3).

Signed-off-by: Yousuk Seung <ysseung@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yousuk Seung
2018-11-15 16:44:12 -08:00
committed by David S. Miller
parent 54e8cb7861
commit e8bd8fca67
2 changed files with 3 additions and 0 deletions
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include/uapi/linux/tcp.h
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@@ -266,6 +266,7 @@ enum {
TCP_NLA_BYTES_RETRANS, /* Data bytes retransmitted */
TCP_NLA_DSACK_DUPS, /* DSACK blocks received */
TCP_NLA_REORD_SEEN, /* reordering events seen */
TCP_NLA_SRTT, /* smoothed RTT in usecs */
};
/* for TCP_MD5SIG socket option */