netdev - [PATCH net-next] tcp: add bytes not sent to SCM_TIMESTAMPING_OPT

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Date:   Mon,  9 Mar 2020 13:16:40 -0700
From:   Yousuk Seung <ysseung@...gle.com>
To:     David Miller <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, Yousuk Seung <ysseung@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Soheil Hassas Yeganeh <soheil@...gle.com>,
        Yuchung Cheng <ycheng@...gle.com>,
        Neal Cardwell <ncardwell@...gle.com>
Subject: [PATCH net-next] tcp: add bytes not sent to SCM_TIMESTAMPING_OPT_STATS

Add TCP_NLA_BYTES_NOTSENT to SCM_TIMESTAMPING_OPT_STATS that reports
bytes in the write queue but not sent. This is the same metric as
what is exported with tcp_info.tcpi_notsent_bytes.

Signed-off-by: Yousuk Seung <ysseung@...gle.com>
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Acked-by: Soheil Hassas Yeganeh <soheil@...gle.com>
Acked-by: Yuchung Cheng <ycheng@...gle.com>
Acked-by: Neal Cardwell <ncardwell@...gle.com>
---
 include/uapi/linux/tcp.h | 1 +
 net/ipv4/tcp.c           | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h
index 1a7fc856e2371..f2acb25663334 100644
--- a/include/uapi/linux/tcp.h
+++ b/include/uapi/linux/tcp.h
@@ -312,6 +312,7 @@ enum {
 	TCP_NLA_REORD_SEEN,	/* reordering events seen */
 	TCP_NLA_SRTT,		/* smoothed RTT in usecs */
 	TCP_NLA_TIMEOUT_REHASH, /* Timeout-triggered rehash attempts */
+	TCP_NLA_BYTES_NOTSENT,	/* Bytes in write queue not yet sent */
 };
 
 /* for TCP_MD5SIG socket option */
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 48aa457a95161..b7134f76f8405 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -3344,6 +3344,7 @@ static size_t tcp_opt_stats_get_size(void)
 		nla_total_size(sizeof(u32)) + /* TCP_NLA_REORD_SEEN */
 		nla_total_size(sizeof(u32)) + /* TCP_NLA_SRTT */
 		nla_total_size(sizeof(u16)) + /* TCP_NLA_TIMEOUT_REHASH */
+		nla_total_size(sizeof(u32)) + /* TCP_NLA_BYTES_NOTSENT */
 		0;
 }
 
@@ -3399,6 +3400,8 @@ struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk)
 	nla_put_u32(stats, TCP_NLA_REORD_SEEN, tp->reord_seen);
 	nla_put_u32(stats, TCP_NLA_SRTT, tp->srtt_us >> 3);
 	nla_put_u16(stats, TCP_NLA_TIMEOUT_REHASH, tp->timeout_rehash);
+	nla_put_u32(stats, TCP_NLA_BYTES_NOTSENT,
+		    max_t(int, 0, tp->write_seq - tp->snd_nxt));
 
 	return stats;
 }
-- 
2.25.1.481.gfbce0eb801-goog