[PATCH net-next 7/8] mptcp: add tracepoint in subflow_check_data_avail

[Mat Martineau]

From: Geliang Tang <geliangt...@gmail.com>

This patch added a tracepoint in subflow_check_data_avail() to show the
mapping status.

Suggested-by: Paolo Abeni <pab...@redhat.com>
Acked-by: Paolo Abeni <pab...@redhat.com>
Signed-off-by: Geliang Tang <geliangt...@gmail.com>
Signed-off-by: Mat Martineau <mathew.j.martin...@linux.intel.com>
---
 include/trace/events/mptcp.h | 29 +++++++++++++++++++++++++++++
 net/mptcp/subflow.c          |  4 +---
 2 files changed, 30 insertions(+), 3 deletions(-)

diff --git a/include/trace/events/mptcp.h b/include/trace/events/mptcp.h
index b90bfe45d995..775a46d0b0f0 100644
--- a/include/trace/events/mptcp.h
+++ b/include/trace/events/mptcp.h
@@ -7,6 +7,14 @@
 
 #include <linux/tracepoint.h>
 
+#define show_mapping_status(status)                                    \
+       __print_symbolic(status,                                        \
+               { 0, "MAPPING_OK" },                                    \
+               { 1, "MAPPING_INVALID" },                               \
+               { 2, "MAPPING_EMPTY" },                                 \
+               { 3, "MAPPING_DATA_FIN" },                              \
+               { 4, "MAPPING_DUMMY" })
+
 TRACE_EVENT(mptcp_subflow_get_send,
 
        TP_PROTO(struct mptcp_subflow_context *subflow),
@@ -138,6 +146,27 @@ TRACE_EVENT(ack_update_msk,
                  __entry->msk_wnd_end)
 );
 
+TRACE_EVENT(subflow_check_data_avail,
+
+       TP_PROTO(__u8 status, struct sk_buff *skb),
+
+       TP_ARGS(status, skb),
+
+       TP_STRUCT__entry(
+               __field(u8, status)
+               __field(const void *, skb)
+       ),
+
+       TP_fast_assign(
+               __entry->status = status;
+               __entry->skb = skb;
+       ),
+
+       TP_printk("mapping_status=%s, skb=%p",
+                 show_mapping_status(__entry->status),
+                 __entry->skb)
+);
+
 #endif /* _TRACE_MPTCP_H */
 
 /* This part must be outside protection */
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index d8a2a55ae916..82e91b00ad39 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -1002,8 +1002,6 @@ static bool subflow_check_data_avail(struct sock *ssk)
        struct mptcp_sock *msk;
        struct sk_buff *skb;
 
-       pr_debug("msk=%p ssk=%p data_avail=%d skb=%p", subflow->conn, ssk,
-                subflow->data_avail, skb_peek(&ssk->sk_receive_queue));
        if (!skb_peek(&ssk->sk_receive_queue))
                subflow->data_avail = 0;
        if (subflow->data_avail)
@@ -1015,7 +1013,7 @@ static bool subflow_check_data_avail(struct sock *ssk)
                u64 old_ack;
 
                status = get_mapping_status(ssk, msk);
-               pr_debug("msk=%p ssk=%p status=%d", msk, ssk, status);
+               trace_subflow_check_data_avail(status, 
skb_peek(&ssk->sk_receive_queue));
                if (status == MAPPING_INVALID) {
                        ssk->sk_err = EBADMSG;
                        goto fatal;
-- 
2.31.1