[PATCH iproute2] ss: add support for bytes_sent, bytes_retrans, dsack_dups and reord_seen

[Eric Dumazet <edumazet@google.com>]

Wei Wang added these fields in linux-4.19

Tested:

ss -ti ...

	ts sack cubic wscale:8,8 rto:7 rtt:2.678/0.267 mss:1428 pmtu:1500
    rcvmss:536 advmss:1428 cwnd:91 ssthresh:65
(*) bytes_sent:17470606104 bytes_retrans:2856
    bytes_acked:17470483297
    segs_out:12234320 segs_in:622983
    data_segs_out:12234318 send 388.2Mbps lastrcv:986784 lastack:1
    pacing_rate 465.8Mbps delivery_rate 162.7Mbps
    delivered:12234235 delivered_ce:3669056
    busy:986784ms unacked:84 retrans:0/2
(*) dsack_dups:2
    rcv_space:14280 rcv_ssthresh:65535 notsent:2016336 minrtt:0.183

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Wei Wang <weiwan@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Cc: Soheil Hassas Yeganeh <soheil@google.com>
---
 misc/ss.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/misc/ss.c b/misc/ss.c
index 3aa94f235085512510dca9fd597e8e37aaaf0fd3..3589ebedc5a0ab0615ba56f3df10d49198bed0d9 100644
--- a/misc/ss.c
+++ b/misc/ss.c
@@ -819,6 +819,8 @@ struct tcpstat {
 	unsigned int	    not_sent;
 	unsigned int	    delivered;
 	unsigned int	    delivered_ce;
+	unsigned int	    dsack_dups;
+	unsigned int	    reord_seen;
 	double		    rcv_rtt;
 	double		    min_rtt;
 	int		    rcv_space;
@@ -826,6 +828,8 @@ struct tcpstat {
 	unsigned long long  busy_time;
 	unsigned long long  rwnd_limited;
 	unsigned long long  sndbuf_limited;
+	unsigned long long  bytes_sent;
+	unsigned long long  bytes_retrans;
 	bool		    has_ts_opt;
 	bool		    has_sack_opt;
 	bool		    has_ecn_opt;
@@ -2426,6 +2430,10 @@ static void tcp_stats_print(struct tcpstat *s)
 	if (s->ssthresh)
 		out(" ssthresh:%d", s->ssthresh);
 
+	if (s->bytes_sent)
+		out(" bytes_sent:%llu", s->bytes_sent);
+	if (s->bytes_retrans)
+		out(" bytes_retrans:%llu", s->bytes_retrans);
 	if (s->bytes_acked)
 		out(" bytes_acked:%llu", s->bytes_acked);
 	if (s->bytes_received)
@@ -2512,10 +2520,14 @@ static void tcp_stats_print(struct tcpstat *s)
 		out(" lost:%u", s->lost);
 	if (s->sacked && s->ss.state != SS_LISTEN)
 		out(" sacked:%u", s->sacked);
+	if (s->dsack_dups)
+		out(" dsack_dups:%u", s->dsack_dups);
 	if (s->fackets)
 		out(" fackets:%u", s->fackets);
 	if (s->reordering != 3)
 		out(" reordering:%d", s->reordering);
+	if (s->reord_seen)
+		out(" reord_seen:%d", s->reord_seen);
 	if (s->rcv_rtt)
 		out(" rcv_rtt:%g", s->rcv_rtt);
 	if (s->rcv_space)
@@ -2837,6 +2849,10 @@ static void tcp_show_info(const struct nlmsghdr *nlh, struct inet_diag_msg *r,
 		s.sndbuf_limited = info->tcpi_sndbuf_limited;
 		s.delivered = info->tcpi_delivered;
 		s.delivered_ce = info->tcpi_delivered_ce;
+		s.dsack_dups = info->tcpi_dsack_dups;
+		s.reord_seen = info->tcpi_reord_seen;
+		s.bytes_sent = info->tcpi_bytes_sent;
+		s.bytes_retrans = info->tcpi_bytes_retrans;
 		tcp_stats_print(&s);
 		free(s.dctcp);
 		free(s.bbr_info);
-- 
2.20.0.rc0.387.gc7a69e6b6c-goog