[PATCH net-next] tcp: add SRTT to SCM_TIMESTAMPING_OPT_STATS
From: Yousuk Seung <hidden>
Date: 2018-11-16 10:54:31
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 <redacted> Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Soheil Hassas Yeganeh <redacted> Acked-by: Neal Cardwell <ncardwell@google.com> Acked-by: Yuchung Cheng <redacted> --- include/uapi/linux/tcp.h | 1 + net/ipv4/tcp.c | 2 ++ 2 files changed, 3 insertions(+)
diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h
index e02d31986ff91..8bb6cc5f32356 100644
--- a/include/uapi/linux/tcp.h
+++ b/include/uapi/linux/tcp.h@@ -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 */
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 9e6bc4d6daa75..0363a0ebee57d 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c@@ -3246,6 +3246,7 @@ 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; }
@@ -3299,6 +3300,7 @@ 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; }
--
2.19.1.1215.g8438c0b245-goog