[MPTCP][PATCH v7 mptcp-next 4/5] mptcp: add the mibs for MP_FAIL

[Geliang Tang <geliangtang@gmail.com>]

From: Geliang Tang <geliangtang@xiaomi.com>

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

Signed-off-by: Geliang Tang <geliangtang@xiaomi.com>
---
 net/mptcp/mib.c     | 2 ++
 net/mptcp/mib.h     | 2 ++
 net/mptcp/options.c | 1 +
 net/mptcp/subflow.c | 1 +
 4 files changed, 6 insertions(+)

diff --git a/net/mptcp/mib.c b/net/mptcp/mib.c
index 3a7c4e7b2d79..b21ff9be04c6 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_ITEM("RcvPruned", MPTCP_MIB_RCVPRUNED),
 	SNMP_MIB_ITEM("SubflowStale", MPTCP_MIB_SUBFLOWSTALE),
 	SNMP_MIB_ITEM("SubflowRecover", MPTCP_MIB_SUBFLOWRECOVER),
diff --git a/net/mptcp/mib.h b/net/mptcp/mib.h
index 8ec16c991aac..ecd3d8b117e0 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_RCVPRUNED,		/* Incoming packet dropped due to memory limit */
 	MPTCP_MIB_SUBFLOWSTALE,		/* Subflows entered 'stale' status */
 	MPTCP_MIB_SUBFLOWRECOVER,	/* Subflows returned to active status after being stale */
diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index ba7166daf6cb..eaee69df6635 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -1158,6 +1158,7 @@ bool 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/subflow.c b/net/mptcp/subflow.c
index d405385d2e7f..0f210d95133d 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -911,6 +911,7 @@ 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