tcp: add data bytes sent stats

Introduce a new TCP stat to record the number of bytes sent
(RFC4898 tcpEStatsPerfHCDataOctetsOut) and expose it in both tcp_info
(TCP_INFO) and opt_stats (SOF_TIMESTAMPING_OPT_STATS).

Signed-off-by: Wei Wang <weiwan@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 27bbe6a792b7..873cb9968ff5 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2594,6 +2594,7 @@ int tcp_disconnect(struct sock *sk, int flags)
         sk->sk_rx_dst = NULL;
         tcp_saved_syn_free(tp);
         tp->compressed_ack = 0;
+        tp->bytes_sent = 0;
 
         /* Clean up fastopen related fields */
         tcp_free_fastopen_req(tp);
@@ -3201,6 +3202,7 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info)
                 info->tcpi_delivery_rate = rate64;
         info->tcpi_delivered = tp->delivered;
         info->tcpi_delivered_ce = tp->delivered_ce;
+        info->tcpi_bytes_sent = tp->bytes_sent;
         unlock_sock_fast(sk, slow);
 }
 EXPORT_SYMBOL_GPL(tcp_get_info);
@@ -3225,6 +3227,7 @@ static size_t tcp_opt_stats_get_size(void)
                 nla_total_size(sizeof(u32)) + /* TCP_NLA_SND_SSTHRESH */
                 nla_total_size(sizeof(u32)) + /* TCP_NLA_DELIVERED */
                 nla_total_size(sizeof(u32)) + /* TCP_NLA_DELIVERED_CE */
+                nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_BYTES_SENT */
                 0;
 }
 
@@ -3272,6 +3275,9 @@ struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk)
         nla_put_u32(stats, TCP_NLA_SNDQ_SIZE, tp->write_seq - tp->snd_una);
         nla_put_u8(stats, TCP_NLA_CA_STATE, inet_csk(sk)->icsk_ca_state);
 
+        nla_put_u64_64bit(stats, TCP_NLA_BYTES_SENT, tp->bytes_sent,
+                          TCP_NLA_PAD);
+
         return stats;
 }