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tcp: export packets delivery info

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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: Yuchung Cheng <ycheng@google.com>
Reviewed-by: Neal Cardwell <ncardwell@google.com>
Reviewed-by: Soheil Hassas Yeganeh <soheil@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yuchung Cheng
2018-04-17 23:18:49 -07:00
committed by David S. Miller
parent e21db6f69a
commit feb5f2ec64
5 changed files with 20 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
net/ipv4/tcp_input.c
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@@ -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;
}