[MPTCP][PATCH v2 mptcp-next 4/5] mptcp: add the mibs for MP_FAIL

[Geliang Tang <geliangtang@gmail.com>]

This patch added the mibs for MP_FAIL: MPTCP_MIB_MPFAILTX and
MPTCP_MIB_MPFAILRX.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
---
 net/mptcp/mib.c     | 2 ++
 net/mptcp/mib.h     | 2 ++
 net/mptcp/options.c | 1 +
 net/mptcp/pm.c      | 1 +
 net/mptcp/subflow.c | 1 +
 5 files changed, 7 insertions(+)

diff --git a/net/mptcp/mib.c b/net/mptcp/mib.c
index 52ea2517e856..3f0df09138b2 100644
--- a/net/mptcp/mib.c
+++ b/net/mptcp/mib.c
@@ -44,6 +44,8 @@ static const struct snmp_mib mptcp_snmp_list[] = {
 	SNMP_MIB_ITEM("RmSubflow", MPTCP_MIB_RMSUBFLOW),
 	SNMP_MIB_ITEM("MPPrioTx", MPTCP_MIB_MPPRIOTX),
 	SNMP_MIB_ITEM("MPPrioRx", MPTCP_MIB_MPPRIORX),
+	SNMP_MIB_ITEM("MPFailTx", MPTCP_MIB_MPFAILTX),
+	SNMP_MIB_ITEM("MPFailRx", MPTCP_MIB_MPFAILRX),
 	SNMP_MIB_SENTINEL
 };
 
diff --git a/net/mptcp/mib.h b/net/mptcp/mib.h
index 193466c9b549..2a6cb1d8704c 100644
--- a/net/mptcp/mib.h
+++ b/net/mptcp/mib.h
@@ -37,6 +37,8 @@ enum linux_mptcp_mib_field {
 	MPTCP_MIB_RMSUBFLOW,		/* Remove a subflow */
 	MPTCP_MIB_MPPRIOTX,		/* Transmit a MP_PRIO */
 	MPTCP_MIB_MPPRIORX,		/* Received a MP_PRIO */
+	MPTCP_MIB_MPFAILTX,		/* Transmit a MP_FAIL */
+	MPTCP_MIB_MPFAILRX,		/* Received a MP_FAIL */
 	__MPTCP_MIB_MAX
 };
 
diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index cd4d0521556d..5442ca39b3eb 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -1136,6 +1136,7 @@ void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb)
 
 	if (mp_opt.mp_fail) {
 		mptcp_pm_mp_fail_received(sk, mp_opt.fail_seq);
+		MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPFAILRX);
 		mp_opt.mp_fail = 0;
 	}
 
diff --git a/net/mptcp/pm.c b/net/mptcp/pm.c
index d7792f6e38ba..d74eb56043c3 100644
--- a/net/mptcp/pm.c
+++ b/net/mptcp/pm.c
@@ -9,6 +9,7 @@
 #include <net/tcp.h>
 #include <net/mptcp.h>
 #include "protocol.h"
+#include "mib.h"
 
 /* path manager command handlers */
 
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index 13e53a6bd3a1..1228ed275a9f 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -914,6 +914,7 @@ static enum mapping_status validate_data_csum(struct sock *ssk, struct sk_buff *
 	if (unlikely(csum_fold(csum))) {
 		MPTCP_INC_STATS(sock_net(ssk), MPTCP_MIB_DATACSUMERR);
 		subflow->send_mp_fail = 1;
+		MPTCP_INC_STATS(sock_net(ssk), MPTCP_MIB_MPFAILTX);
 		return subflow->mp_join ? MAPPING_INVALID : MAPPING_DUMMY;
 	}
 
-- 
2.31.1