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Commit e8bd8fca authored Nov 15, 2018 by Yousuk Seung Committed by David S. Miller Nov 17, 2018

tcp: add SRTT to SCM_TIMESTAMPING_OPT_STATS



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>

parent 54e8cb78

include/uapi/linux/tcp.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -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 */

net/ipv4/tcp.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -3242,6 +3242,7 @@ static size_t tcp_opt_stats_get_size(void)
		nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_BYTES_RETRANS */
		nla_total_size(sizeof(u32)) + /* TCP_NLA_DSACK_DUPS */
		nla_total_size(sizeof(u32)) + /* TCP_NLA_REORD_SEEN */
		nla_total_size(sizeof(u32)) + /* TCP_NLA_SRTT */
		0;
		}

		@@ -3295,6 +3296,7 @@ struct sk_buff tcp_get_timestamping_opt_stats(const struct sock sk)
		TCP_NLA_PAD);
		nla_put_u32(stats, TCP_NLA_DSACK_DUPS, tp->dsack_dups);
		nla_put_u32(stats, TCP_NLA_REORD_SEEN, tp->reord_seen);
		nla_put_u32(stats, TCP_NLA_SRTT, tp->srtt_us >> 3);

		return stats;
		}