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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>
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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1
include/uapi/linux/tcp.h
View File

@ -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 */

2
net/ipv4/tcp.c
View File

@ -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;
}