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Subject[PATCH net-next 1/3] rxrpc: Trace resend
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Date
Add a tracepoint to trace packet resend events and to dump the Tx
annotation buffer for added illumination.

Signed-off-by: David Howells <dhowells@rdhat.com>
---

include/trace/events/rxrpc.h | 24 ++++++++++++++++++++++++
net/rxrpc/call_event.c | 1 +
2 files changed, 25 insertions(+)

diff --git a/include/trace/events/rxrpc.h b/include/trace/events/rxrpc.h
index 36cb50c111a6..41979f907575 100644
--- a/include/trace/events/rxrpc.h
+++ b/include/trace/events/rxrpc.h
@@ -420,6 +420,7 @@ rxrpc_rtt_rx_traces;
rxrpc_timer_traces;
rxrpc_propose_ack_traces;
rxrpc_propose_ack_outcomes;
+rxrpc_congest_modes;
rxrpc_congest_changes;

/*
@@ -1229,6 +1230,29 @@ TRACE_EVENT(rxrpc_connect_call,
__entry->call_id)
);

+TRACE_EVENT(rxrpc_resend,
+ TP_PROTO(struct rxrpc_call *call, int ix),
+
+ TP_ARGS(call, ix),
+
+ TP_STRUCT__entry(
+ __field(struct rxrpc_call *, call )
+ __field(int, ix )
+ __array(u8, anno, 64 )
+ ),
+
+ TP_fast_assign(
+ __entry->call = call;
+ __entry->ix = ix;
+ memcpy(__entry->anno, call->rxtx_annotations, 64);
+ ),
+
+ TP_printk("c=%p ix=%u a=%64phN",
+ __entry->call,
+ __entry->ix,
+ __entry->anno)
+ );
+
#endif /* _TRACE_RXRPC_H */

/* This part must be outside protection */
diff --git a/net/rxrpc/call_event.c b/net/rxrpc/call_event.c
index ad2ab1103189..6a62e42e1d8d 100644
--- a/net/rxrpc/call_event.c
+++ b/net/rxrpc/call_event.c
@@ -195,6 +195,7 @@ static void rxrpc_resend(struct rxrpc_call *call, unsigned long now_j)
* the packets in the Tx buffer we're going to resend and what the new
* resend timeout will be.
*/
+ trace_rxrpc_resend(call, (cursor + 1) & RXRPC_RXTX_BUFF_MASK);
oldest = now;
for (seq = cursor + 1; before_eq(seq, top); seq++) {
ix = seq & RXRPC_RXTX_BUFF_MASK;
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