[PATCH net-next 1/2] tcp: record pkts sent and retransmistted

Add two stats in SCM_TIMESTAMPING_OPT_STATS:

TCP_NLA_DATA_SEGS_OUT: total data packets sent including retransmission
TCP_NLA_TOTAL_RETRANS: total data packets retransmitted

The names are picked to be consistent with corresponding fields in
TCP_INFO. This allows applications that are using the timestamping
API to measure latency stats to also retrive retransmission rate
of application write.

Signed-off-by: Yuchung Cheng <redacted>
Signed-off-by: Soheil Hassas Yeganeh <redacted>
Acked-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
---
 include/uapi/linux/tcp.h | 2 ++
 net/ipv4/tcp.c           | 6 +++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h
index 6ff35eb48d10..38a2b07afdff 100644
--- a/include/uapi/linux/tcp.h
+++ b/include/uapi/linux/tcp.h

@@ -227,6 +227,8 @@ enum {
 	TCP_NLA_BUSY,		/* Time (usec) busy sending data */
 	TCP_NLA_RWND_LIMITED,	/* Time (usec) limited by receive window */
 	TCP_NLA_SNDBUF_LIMITED,	/* Time (usec) limited by send buffer */
+	TCP_NLA_DATA_SEGS_OUT,	/* Data pkts sent including retransmission */
+	TCP_NLA_TOTAL_RETRANS,	/* Data pkts retransmitted */
 };
 
 /* for TCP_MD5SIG socket option */

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 2ed472ebf3b5..b751abc56935 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c

@@ -2870,7 +2870,7 @@ struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk)
 	struct sk_buff *stats;
 	struct tcp_info info;
 
-	stats = alloc_skb(3 * nla_total_size_64bit(sizeof(u64)), GFP_ATOMIC);
+	stats = alloc_skb(5 * nla_total_size_64bit(sizeof(u64)), GFP_ATOMIC);
 	if (!stats)
 		return NULL;
 

@@ -2881,6 +2881,10 @@ struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk)
 			  info.tcpi_rwnd_limited, TCP_NLA_PAD);
 	nla_put_u64_64bit(stats, TCP_NLA_SNDBUF_LIMITED,
 			  info.tcpi_sndbuf_limited, TCP_NLA_PAD);
+	nla_put_u64_64bit(stats, TCP_NLA_DATA_SEGS_OUT,
+			  tp->data_segs_out, TCP_NLA_PAD);
+	nla_put_u64_64bit(stats, TCP_NLA_TOTAL_RETRANS,
+			  tp->total_retrans, TCP_NLA_PAD);
 	return stats;
 }
 

-- 
2.11.0.483.g087da7b7c-goog

Currently the retransmission stats are not incremented if the
retransmit fails locally. But we always increment the other packet
counters that track total packet/bytes sent.  Awkwardly while we
don't count these failed retransmits in RETRANSSEGS, we do count
them in FAILEDRETRANS.

If the qdisc is dropping many packets this could under-estimate
TCP retransmission rate substantially from both SNMP or per-socket
TCP_INFO stats. This patch changes this by always incrementing
retransmission stats on retransmission attempts and failures.

Another motivation is to properly track retransmists in
SCM_TIMESTAMPING_OPT_STATS. Since SCM_TSTAMP_SCHED collection is
triggered in tcp_transmit_skb(), If tp->total_retrans is incremented
after the function, we'll always mis-count by the amount of the
latest retransmission.

Signed-off-by: Yuchung Cheng <redacted>
Signed-off-by: Soheil Hassas Yeganeh <redacted>
Acked-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
---
 net/ipv4/tcp_output.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 671c69535671..7b2d8762f15f 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c

@@ -2771,6 +2771,13 @@ int __tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb, int segs)
 	if ((TCP_SKB_CB(skb)->tcp_flags & TCPHDR_SYN_ECN) == TCPHDR_SYN_ECN)
 		tcp_ecn_clear_syn(sk, skb);
 
+	/* Update global and local TCP statistics. */
+	segs = tcp_skb_pcount(skb);
+	TCP_ADD_STATS(sock_net(sk), TCP_MIB_RETRANSSEGS, segs);
+	if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_SYN)
+		__NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPSYNRETRANS);
+	tp->total_retrans += segs;
+
 	/* make sure skb->data is aligned on arches that require it
 	 * and check if ack-trimming & collapsing extended the headroom
 	 * beyond what csum_start can cover.

@@ -2788,14 +2795,9 @@ int __tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb, int segs)
 	}
 
 	if (likely(!err)) {
-		segs = tcp_skb_pcount(skb);
-
 		TCP_SKB_CB(skb)->sacked |= TCPCB_EVER_RETRANS;
-		/* Update global TCP statistics. */
-		TCP_ADD_STATS(sock_net(sk), TCP_MIB_RETRANSSEGS, segs);
-		if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_SYN)
-			__NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPSYNRETRANS);
-		tp->total_retrans += segs;
+	} else if (err != -EBUSY) {
+		NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPRETRANSFAIL);
 	}
 	return err;
 }

@@ -2818,8 +2820,6 @@ int tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb, int segs)
 		if (!tp->retrans_stamp)
 			tp->retrans_stamp = tcp_skb_timestamp(skb);
 
-	} else if (err != -EBUSY) {
-		NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPRETRANSFAIL);
 	}
 
 	if (tp->undo_retrans < 0)

-- 
2.11.0.483.g087da7b7c-goog

From: Yuchung Cheng <redacted>
Date: Fri, 27 Jan 2017 16:24:38 -0800

Add two stats in SCM_TIMESTAMPING_OPT_STATS:

TCP_NLA_DATA_SEGS_OUT: total data packets sent including retransmission
TCP_NLA_TOTAL_RETRANS: total data packets retransmitted

The names are picked to be consistent with corresponding fields in
TCP_INFO. This allows applications that are using the timestamping
API to measure latency stats to also retrive retransmission rate
of application write.

Signed-off-by: Yuchung Cheng <redacted>
Signed-off-by: Soheil Hassas Yeganeh <redacted>
Acked-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>

Applied.

From: Yuchung Cheng <redacted>
Date: Fri, 27 Jan 2017 16:24:39 -0800

Currently the retransmission stats are not incremented if the
retransmit fails locally. But we always increment the other packet
counters that track total packet/bytes sent.  Awkwardly while we
don't count these failed retransmits in RETRANSSEGS, we do count
them in FAILEDRETRANS.

If the qdisc is dropping many packets this could under-estimate
TCP retransmission rate substantially from both SNMP or per-socket
TCP_INFO stats. This patch changes this by always incrementing
retransmission stats on retransmission attempts and failures.

Another motivation is to properly track retransmists in
SCM_TIMESTAMPING_OPT_STATS. Since SCM_TSTAMP_SCHED collection is
triggered in tcp_transmit_skb(), If tp->total_retrans is incremented
after the function, we'll always mis-count by the amount of the
latest retransmission.

Signed-off-by: Yuchung Cheng <redacted>
Signed-off-by: Soheil Hassas Yeganeh <redacted>
Acked-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>

Also applied, thank you.