rxrpc: Differentiate PING ACK transmission traces.

There are three points that transmit PING ACKs and all of them use the same
trace string.  Change two of them to use different strings.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: "David S. Miller" <davem@davemloft.net>
cc: Eric Dumazet <edumazet@google.com>
cc: Jakub Kicinski <kuba@kernel.org>
cc: Paolo Abeni <pabeni@redhat.com>
cc: linux-afs@lists.infradead.org
cc: netdev@vger.kernel.org
diff --git a/include/trace/events/rxrpc.h b/include/trace/events/rxrpc.h
index c730cd7..3b726a6 100644
--- a/include/trace/events/rxrpc.h
+++ b/include/trace/events/rxrpc.h
@@ -364,11 +364,13 @@
 
 #define rxrpc_propose_ack_traces \
 	EM(rxrpc_propose_ack_client_tx_end,	"ClTxEnd") \
+	EM(rxrpc_propose_ack_delayed_ack,	"DlydAck") \
 	EM(rxrpc_propose_ack_input_data,	"DataIn ") \
 	EM(rxrpc_propose_ack_input_data_hole,	"DataInH") \
 	EM(rxrpc_propose_ack_ping_for_keepalive, "KeepAlv") \
 	EM(rxrpc_propose_ack_ping_for_lost_ack,	"LostAck") \
 	EM(rxrpc_propose_ack_ping_for_lost_reply, "LostRpl") \
+	EM(rxrpc_propose_ack_ping_for_0_retrans, "0-Retrn") \
 	EM(rxrpc_propose_ack_ping_for_old_rtt,	"OldRtt ") \
 	EM(rxrpc_propose_ack_ping_for_params,	"Params ") \
 	EM(rxrpc_propose_ack_ping_for_rtt,	"Rtt    ") \
diff --git a/net/rxrpc/call_event.c b/net/rxrpc/call_event.c
index ef28ebf..bc1a5ab 100644
--- a/net/rxrpc/call_event.c
+++ b/net/rxrpc/call_event.c
@@ -197,7 +197,7 @@ void rxrpc_resend(struct rxrpc_call *call, struct sk_buff *ack_skb)
 		if (ktime_to_us(ack_ts) < (call->peer->srtt_us >> 3))
 			goto out;
 		rxrpc_send_ACK(call, RXRPC_ACK_PING, 0,
-			       rxrpc_propose_ack_ping_for_lost_ack);
+			       rxrpc_propose_ack_ping_for_0_retrans);
 		goto out;
 	}
 
@@ -387,7 +387,7 @@ bool rxrpc_input_call_event(struct rxrpc_call *call, struct sk_buff *skb)
 		trace_rxrpc_timer(call, rxrpc_timer_exp_ack, now);
 		call->delay_ack_at = now + MAX_JIFFY_OFFSET;
 		rxrpc_send_ACK(call, RXRPC_ACK_DELAY, 0,
-			       rxrpc_propose_ack_ping_for_lost_ack);
+			       rxrpc_propose_ack_delayed_ack);
 	}
 
 	t = call->ack_lost_at;