[MPTCP][PATCH v2 mptcp-next 14/16] mptcp: add trace event for data checksum

[Geliang Tang <geliangtang@gmail.com>]

This patch added the trace event for the data checksum. Add the tracepoints
in mptcp_generate_data_checksum and mptcp_validate_data_checksum.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
---
 include/trace/events/mptcp.h | 38 ++++++++++++++++++++++++++++++++++++
 net/mptcp/protocol.c         |  4 ++++
 2 files changed, 42 insertions(+)

diff --git a/include/trace/events/mptcp.h b/include/trace/events/mptcp.h
index 5571c45c61f2..ebfcc1a6fe3d 100644
--- a/include/trace/events/mptcp.h
+++ b/include/trace/events/mptcp.h
@@ -145,6 +145,44 @@ TRACE_EVENT(subflow_check_data_avail,
 		  __entry->skb)
 );
 
+DECLARE_EVENT_CLASS(mptcp_event_data_checksum,
+
+	TP_PROTO(struct csum_pseudo_header *header, __sum16 csum),
+
+	TP_ARGS(header, csum),
+
+	TP_STRUCT__entry(
+		__field(u64, data_seq)
+		__field(u32, subflow_seq)
+		__field(u16, data_len)
+		__field(u16, data_csum)
+		__field(u16, csum)
+	),
+
+	TP_fast_assign(
+		__entry->data_seq = header->data_seq;
+		__entry->subflow_seq = header->subflow_seq;
+		__entry->data_len = header->data_len;
+		__entry->data_csum = (__force u16)header->csum;
+		__entry->csum = (__force u16)csum;
+	),
+
+	TP_printk("data_seq=%llu subflow_seq=%u data_len=%u csum=%u",
+		  __entry->data_seq, __entry->subflow_seq, __entry->data_len,
+		  __entry->csum)
+);
+
+DEFINE_EVENT(mptcp_event_data_checksum, mptcp_generate_data_checksum,
+	TP_PROTO(struct csum_pseudo_header *header, __sum16 csum),
+	TP_ARGS(header, csum));
+
+DEFINE_EVENT_PRINT(mptcp_event_data_checksum, mptcp_validate_data_checksum,
+	TP_PROTO(struct csum_pseudo_header *header, __sum16 csum),
+	TP_ARGS(header, csum),
+	TP_printk("data_seq=%llu subflow_seq=%u data_len=%u csum=%u, checksum %s!",
+		  __entry->data_seq, __entry->subflow_seq, __entry->data_len,
+		  __entry->data_csum, __entry->csum ? "error" : "done"));
+
 #endif /* _TRACE_MPTCP_H */
 
 /* This part must be outside protection */
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index e414ff940727..0fe9c29bcda8 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -552,6 +552,8 @@ static bool mptcp_validate_data_checksum(struct sock *ssk)
 
 	csum = csum_partial(&header, sizeof(header), subflow->data_csum);
 
+	trace_mptcp_validate_data_checksum(&header, csum_fold(csum));
+
 	if (csum_fold(csum)) {
 		MPTCP_INC_STATS(sock_net(ssk), MPTCP_MIB_DSSCSUMERR);
 		return false;
@@ -1307,6 +1309,8 @@ static __sum16 mptcp_generate_data_checksum(struct sk_buff *skb)
 	csum = skb_checksum(skb, 0, skb->len, 0);
 	csum = csum_partial(&header, sizeof(header), csum);
 
+	trace_mptcp_generate_data_checksum(&header, csum_fold(csum));
+
 	return csum_fold(csum);
 }
 
-- 
2.30.2