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authorYuchung Cheng <ycheng@google.com>2017-01-28 03:24:38 +0300
committerDavid S. Miller <davem@davemloft.net>2017-01-30 03:17:23 +0300
commit7e98102f489775d8c000884fca8a0d995ea688a9 (patch)
tree40a40dc7f485407ab82f3851f8a50ba8337525c6
parentf33f4ac3d3a6e29f1c5a9d8cd1058d298f4685f4 (diff)
downloadlinux-7e98102f489775d8c000884fca8a0d995ea688a9.tar.xz
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 <ycheng@google.com> Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/uapi/linux/tcp.h2
-rw-r--r--net/ipv4/tcp.c6
2 files changed, 7 insertions, 1 deletions
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;
}