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rxrpc: Trace resend 

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>
This commit is contained in:
David Howells 2018-03-27 23:02:47 +01:00
parent 5d22d47b9e
commit 827efed6a6
2 changed files with 25 additions and 0 deletions
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24
include/trace/events/rxrpc.h
View File

@ -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 */

1
net/rxrpc/call_event.c
View File

@ -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;