Commit feb5f2ec authored by Yuchung Cheng's avatar Yuchung Cheng Committed by David S. Miller
Browse files

tcp: export packets delivery info 



Export data delivered and delivered with CE marks to
1) SNMP TCPDelivered and TCPDeliveredCE
2) getsockopt(TCP_INFO)
3) Timestamping API SOF_TIMESTAMPING_OPT_STATS

Note that for SCM_TSTAMP_ACK, the delivery info in
SOF_TIMESTAMPING_OPT_STATS is reported before the info
was fully updated on the ACK.

These stats help application monitor TCP delivery and ECN status
on per host, per connection, even per message level.

Signed-off-by: default avatarYuchung Cheng <ycheng@google.com>
Reviewed-by: default avatarNeal Cardwell <ncardwell@google.com>
Reviewed-by: default avatarSoheil Hassas Yeganeh <soheil@google.com>
Reviewed-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e21db6f6

include/uapi/linux/snmp.h

+2 −0
Original line number Diff line number Diff line
@@ -276,6 +276,8 @@ enum 
	LINUX_MIB_TCPKEEPALIVE,			/* TCPKeepAlive */

	LINUX_MIB_TCPMTUPFAIL,			/* TCPMTUPFail */

	LINUX_MIB_TCPMTUPSUCCESS,		/* TCPMTUPSuccess */

	LINUX_MIB_TCPDELIVERED,			/* TCPDelivered */

	LINUX_MIB_TCPDELIVEREDCE,		/* TCPDeliveredCE */

	__LINUX_MIB_MAX

};

include/uapi/linux/tcp.h

+5 −0
Original line number Diff line number Diff line
@@ -224,6 +224,9 @@ struct tcp_info { 
	__u64	tcpi_busy_time;      /* Time (usec) busy sending data */

	__u64	tcpi_rwnd_limited;   /* Time (usec) limited by receive window */

	__u64	tcpi_sndbuf_limited; /* Time (usec) limited by send buffer */



	__u32	tcpi_delivered;

	__u32	tcpi_delivered_ce;

};



/* netlink attributes types for SCM_TIMESTAMPING_OPT_STATS */
@@ -244,6 +247,8 @@ enum { 
	TCP_NLA_SNDQ_SIZE,	/* Data (bytes) pending in send queue */

	TCP_NLA_CA_STATE,	/* ca_state of socket */

	TCP_NLA_SND_SSTHRESH,	/* Slow start size threshold */

	TCP_NLA_DELIVERED,	/* Data pkts delivered incl. out-of-order */

	TCP_NLA_DELIVERED_CE,	/* Like above but only ones w/ CE marks */



};

net/ipv4/proc.c

+2 −0
Original line number Diff line number Diff line
@@ -296,6 +296,8 @@ static const struct snmp_mib snmp4_net_list[] = { 
	SNMP_MIB_ITEM("TCPKeepAlive", LINUX_MIB_TCPKEEPALIVE),

	SNMP_MIB_ITEM("TCPMTUPFail", LINUX_MIB_TCPMTUPFAIL),

	SNMP_MIB_ITEM("TCPMTUPSuccess", LINUX_MIB_TCPMTUPSUCCESS),

	SNMP_MIB_ITEM("TCPDelivered", LINUX_MIB_TCPDELIVERED),

	SNMP_MIB_ITEM("TCPDeliveredCE", LINUX_MIB_TCPDELIVEREDCE),

	SNMP_MIB_SENTINEL

};

net/ipv4/tcp.c

+6 −1
Original line number Diff line number Diff line
@@ -3167,6 +3167,8 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info) 
	rate64 = tcp_compute_delivery_rate(tp);

	if (rate64)

		info->tcpi_delivery_rate = rate64;

	info->tcpi_delivered = tp->delivered;

	info->tcpi_delivered_ce = tp->delivered_ce;

	unlock_sock_fast(sk, slow);

}

EXPORT_SYMBOL_GPL(tcp_get_info);
@@ -3180,7 +3182,7 @@ struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk) 
	u32 rate;



	stats = alloc_skb(7 * nla_total_size_64bit(sizeof(u64)) +

			  5 * nla_total_size(sizeof(u32)) +

			  7 * nla_total_size(sizeof(u32)) +

			  3 * nla_total_size(sizeof(u8)), GFP_ATOMIC);

	if (!stats)

		return NULL;
@@ -3211,9 +3213,12 @@ struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk) 
	nla_put_u8(stats, TCP_NLA_RECUR_RETRANS, inet_csk(sk)->icsk_retransmits);

	nla_put_u8(stats, TCP_NLA_DELIVERY_RATE_APP_LMT, !!tp->rate_app_limited);

	nla_put_u32(stats, TCP_NLA_SND_SSTHRESH, tp->snd_ssthresh);

	nla_put_u32(stats, TCP_NLA_DELIVERED, tp->delivered);

	nla_put_u32(stats, TCP_NLA_DELIVERED_CE, tp->delivered_ce);



	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);



	return stats;

}

net/ipv4/tcp_input.c

+5 −1
Original line number Diff line number Diff line
@@ -3499,12 +3499,16 @@ static void tcp_xmit_recovery(struct sock *sk, int rexmit) 
/* Returns the number of packets newly acked or sacked by the current ACK */

static u32 tcp_newly_delivered(struct sock *sk, u32 prior_delivered, int flag)

{

	const struct net *net = sock_net(sk);

	struct tcp_sock *tp = tcp_sk(sk);

	u32 delivered;



	delivered = tp->delivered - prior_delivered;

	if (flag & FLAG_ECE)

	NET_ADD_STATS(net, LINUX_MIB_TCPDELIVERED, delivered);

	if (flag & FLAG_ECE) {

		tp->delivered_ce += delivered;

		NET_ADD_STATS(net, LINUX_MIB_TCPDELIVEREDCE, delivered);

	}

	return delivered;

}

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