[PATCH net-next 6/8] mptcp: add tracepoint in ack_update_msk

[Mat Martineau]

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

This patch added a tracepoint in ack_update_msk() to track the
incoming data_ack and window/snd_una updates.

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 | 32 ++++++++++++++++++++++++++++++++
 net/mptcp/options.c          |  6 ++++++
 2 files changed, 38 insertions(+)

diff --git a/include/trace/events/mptcp.h b/include/trace/events/mptcp.h
index ec20350d82eb..b90bfe45d995 100644
--- a/include/trace/events/mptcp.h
+++ b/include/trace/events/mptcp.h
@@ -106,6 +106,38 @@ DEFINE_EVENT(mptcp_dump_mpext, get_mapping_status,
        TP_PROTO(struct mptcp_ext *mpext),
        TP_ARGS(mpext));
 
+TRACE_EVENT(ack_update_msk,
+
+       TP_PROTO(u64 data_ack, u64 old_snd_una,
+                u64 new_snd_una, u64 new_wnd_end,
+                u64 msk_wnd_end),
+
+       TP_ARGS(data_ack, old_snd_una,
+               new_snd_una, new_wnd_end,
+               msk_wnd_end),
+
+       TP_STRUCT__entry(
+               __field(u64, data_ack)
+               __field(u64, old_snd_una)
+               __field(u64, new_snd_una)
+               __field(u64, new_wnd_end)
+               __field(u64, msk_wnd_end)
+       ),
+
+       TP_fast_assign(
+               __entry->data_ack = data_ack;
+               __entry->old_snd_una = old_snd_una;
+               __entry->new_snd_una = new_snd_una;
+               __entry->new_wnd_end = new_wnd_end;
+               __entry->msk_wnd_end = msk_wnd_end;
+       ),
+
+       TP_printk("data_ack=%llu old_snd_una=%llu new_snd_una=%llu 
new_wnd_end=%llu msk_wnd_end=%llu",
+                 __entry->data_ack, __entry->old_snd_una,
+                 __entry->new_snd_una, __entry->new_wnd_end,
+                 __entry->msk_wnd_end)
+);
+
 #endif /* _TRACE_MPTCP_H */
 
 /* This part must be outside protection */
diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index d51c3ad54d9a..99fc21406168 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -13,6 +13,8 @@
 #include "protocol.h"
 #include "mib.h"
 
+#include <trace/events/mptcp.h>
+
 static bool mptcp_cap_flag_sha256(u8 flags)
 {
        return (flags & MPTCP_CAP_FLAG_MASK) == MPTCP_CAP_HMAC_SHA256;
@@ -943,6 +945,10 @@ static void ack_update_msk(struct mptcp_sock *msk,
                __mptcp_data_acked(sk);
        }
        mptcp_data_unlock(sk);
+
+       trace_ack_update_msk(mp_opt->data_ack,
+                            old_snd_una, new_snd_una,
+                            new_wnd_end, msk->wnd_end);
 }
 
 bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool 
use_64bit)
-- 
2.31.1