netdev - [PATCH net-next 2/7] mptcp: add active MPC mibs

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Message-Id: <20210401231947.162836-3-mathew.j.martineau@linux.intel.com>
Date:   Thu,  1 Apr 2021 16:19:42 -0700
From:   Mat Martineau <mathew.j.martineau@...ux.intel.com>
To:     netdev@...r.kernel.org
Cc:     Paolo Abeni <pabeni@...hat.com>, davem@...emloft.net,
        kuba@...nel.org, matthieu.baerts@...sares.net,
        mptcp@...ts.linux.dev,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>
Subject: [PATCH net-next 2/7] mptcp: add active MPC mibs

From: Paolo Abeni <pabeni@...hat.com>

We are not currently tracking the active MPTCP connection
attempts. Let's add the related counters.

Signed-off-by: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>
---
 net/mptcp/mib.c      | 2 ++
 net/mptcp/mib.h      | 2 ++
 net/mptcp/protocol.c | 2 ++
 net/mptcp/subflow.c  | 1 +
 4 files changed, 7 insertions(+)

diff --git a/net/mptcp/mib.c b/net/mptcp/mib.c
index b0429aca4f76..eb2dc6dbe212 100644
--- a/net/mptcp/mib.c
+++ b/net/mptcp/mib.c
@@ -10,6 +10,8 @@
 
 static const struct snmp_mib mptcp_snmp_list[] = {
 	SNMP_MIB_ITEM("MPCapableSYNRX", MPTCP_MIB_MPCAPABLEPASSIVE),
+	SNMP_MIB_ITEM("MPCapableSYNTX", MPTCP_MIB_MPCAPABLEACTIVE),
+	SNMP_MIB_ITEM("MPCapableSYNACKRX", MPTCP_MIB_MPCAPABLEACTIVEACK),
 	SNMP_MIB_ITEM("MPCapableACKRX", MPTCP_MIB_MPCAPABLEPASSIVEACK),
 	SNMP_MIB_ITEM("MPCapableFallbackACK", MPTCP_MIB_MPCAPABLEPASSIVEFALLBACK),
 	SNMP_MIB_ITEM("MPCapableFallbackSYNACK", MPTCP_MIB_MPCAPABLEACTIVEFALLBACK),
diff --git a/net/mptcp/mib.h b/net/mptcp/mib.h
index 50e1668c9a01..f0da4f060fe1 100644
--- a/net/mptcp/mib.h
+++ b/net/mptcp/mib.h
@@ -3,6 +3,8 @@
 enum linux_mptcp_mib_field {
 	MPTCP_MIB_NUM = 0,
 	MPTCP_MIB_MPCAPABLEPASSIVE,	/* Received SYN with MP_CAPABLE */
+	MPTCP_MIB_MPCAPABLEACTIVE,	/* Sent SYN with MP_CAPABLE */
+	MPTCP_MIB_MPCAPABLEACTIVEACK,	/* Received SYN/ACK with MP_CAPABLE */
 	MPTCP_MIB_MPCAPABLEPASSIVEACK,	/* Received third ACK with MP_CAPABLE */
 	MPTCP_MIB_MPCAPABLEPASSIVEFALLBACK,/* Server-side fallback during 3-way handshake */
 	MPTCP_MIB_MPCAPABLEACTIVEFALLBACK, /* Client-side fallback during 3-way handshake */
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 3b50e8cc0c5f..0c916d48cad8 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -3228,6 +3228,8 @@ static int mptcp_stream_connect(struct socket *sock, struct sockaddr *uaddr,
 		MPTCP_INC_STATS(sock_net(ssock->sk), MPTCP_MIB_TOKENFALLBACKINIT);
 		mptcp_subflow_early_fallback(msk, subflow);
 	}
+	if (likely(!__mptcp_check_fallback(msk)))
+		MPTCP_INC_STATS(sock_net(sock->sk), MPTCP_MIB_MPCAPABLEACTIVE);
 
 do_connect:
 	err = ssock->ops->connect(ssock, uaddr, addr_len, flags);
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index b96e8dc01f08..7a5f50d00d4b 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -395,6 +395,7 @@ static void subflow_finish_connect(struct sock *sk, const struct sk_buff *skb)
 		subflow->remote_key = mp_opt.sndr_key;
 		pr_debug("subflow=%p, remote_key=%llu", subflow,
 			 subflow->remote_key);
+		MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPCAPABLEACTIVEACK);
 		mptcp_finish_connect(sk);
 	} else if (subflow->request_join) {
 		u8 hmac[SHA256_DIGEST_SIZE];
-- 
2.31.1