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Commit 7e98102f authored by Yuchung Cheng's avatar Yuchung Cheng Committed by David S. Miller
Browse files

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: default avatarYuchung Cheng <ycheng@google.com>
Signed-off-by: default avatarSoheil Hassas Yeganeh <soheil@google.com>
Acked-by: default avatarNeal Cardwell <ncardwell@google.com>
Acked-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f33f4ac3

include/uapi/linux/tcp.h

+2 −0
Original line number Diff line number Diff line
@@ -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 */

net/ipv4/tcp.c

+5 −1
Original line number Diff line number Diff line
@@ -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;

}