[MPTCP][PATCH v3 mptcp-next 8/8] mptcp: add a mib for the infinite mapping sending

[Geliang Tang <geliangtang@gmail.com>]

This patch added a new mib named MPTCP_MIB_INFINITEMAPTX, increase it
when a infinite mapping has been sent out.

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

diff --git a/net/mptcp/mib.c b/net/mptcp/mib.c
index 3f0df09138b2..1ac11966bdcd 100644
--- a/net/mptcp/mib.c
+++ b/net/mptcp/mib.c
@@ -24,6 +24,7 @@ static const struct snmp_mib mptcp_snmp_list[] = {
 	SNMP_MIB_ITEM("MPJoinAckRx", MPTCP_MIB_JOINACKRX),
 	SNMP_MIB_ITEM("MPJoinAckHMacFailure", MPTCP_MIB_JOINACKMAC),
 	SNMP_MIB_ITEM("DSSNotMatching", MPTCP_MIB_DSSNOMATCH),
+	SNMP_MIB_ITEM("InfiniteMapTx", MPTCP_MIB_INFINITEMAPTX),
 	SNMP_MIB_ITEM("InfiniteMapRx", MPTCP_MIB_INFINITEMAPRX),
 	SNMP_MIB_ITEM("DSSNoMatchTCP", MPTCP_MIB_DSSTCPMISMATCH),
 	SNMP_MIB_ITEM("DataCsumErr", MPTCP_MIB_DATACSUMERR),
diff --git a/net/mptcp/mib.h b/net/mptcp/mib.h
index 2a6cb1d8704c..fe0d1b2e9455 100644
--- a/net/mptcp/mib.h
+++ b/net/mptcp/mib.h
@@ -17,6 +17,7 @@ enum linux_mptcp_mib_field {
 	MPTCP_MIB_JOINACKRX,		/* Received an ACK + MP_JOIN */
 	MPTCP_MIB_JOINACKMAC,		/* HMAC was wrong on ACK + MP_JOIN */
 	MPTCP_MIB_DSSNOMATCH,		/* Received a new mapping that did not match the previous one */
+	MPTCP_MIB_INFINITEMAPTX,	/* Sent an infinite mapping */
 	MPTCP_MIB_INFINITEMAPRX,	/* Received an infinite mapping */
 	MPTCP_MIB_DSSTCPMISMATCH,	/* DSS-mapping did not map with TCP's sequence numbers */
 	MPTCP_MIB_DATACSUMERR,		/* The data checksum fail */
diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index 1fce6fddb6ab..abd0d4660a67 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -575,12 +575,16 @@ static void mptcp_write_data_fin(struct mptcp_subflow_context *subflow,
 static void mptcp_write_infinite_mapping(struct mptcp_subflow_context *subflow,
 					 struct mptcp_ext *ext)
 {
+	struct mptcp_sock *msk = mptcp_sk(subflow->conn);
+	struct sock *sk = (struct sock *)msk;
+
 	pr_debug("fail_seq=%llu", subflow->fail_seq);
 
 	if (ext->use_map) {
 		ext->data_seq = subflow->fail_seq;
 		ext->data_len = 0;
 		WRITE_ONCE(msk->snd_infinite_mapping_enable, false);
+		MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_INFINITEMAPTX);
 	}
 }
 
-- 
2.31.1