[PATCH net-next 34/37] rxrpc: Add a reason indicator to the tx_ack tracepoint

[David Howells <dhowells@redhat.com>]

Record the reason for the transmission of an ACK in the rxrpc_tx_ack
tracepoint, and not just in the rxrpc_propose_ack tracepoint.

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
---
 include/trace/events/rxrpc.h | 13 +++++++++----
 net/rxrpc/conn_event.c       |  3 ++-
 net/rxrpc/output.c           |  2 +-
 3 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/include/trace/events/rxrpc.h b/include/trace/events/rxrpc.h
index d79623fff746..0cfc8e1baf1f 100644
--- a/include/trace/events/rxrpc.h
+++ b/include/trace/events/rxrpc.h
@@ -375,6 +375,7 @@
 	EM(rxrpc_propose_ack_processing_op,	"ProcOp ") \
 	EM(rxrpc_propose_ack_respond_to_ack,	"Rsp2Ack") \
 	EM(rxrpc_propose_ack_respond_to_ping,	"Rsp2Png") \
+	EM(rxrpc_propose_ack_retransmit,	"Retrans") \
 	EM(rxrpc_propose_ack_retry_tx,		"RetryTx") \
 	EM(rxrpc_propose_ack_rotate_rx,		"RxAck  ") \
 	EM(rxrpc_propose_ack_rx_idle,		"RxIdle ") \
@@ -1267,9 +1268,10 @@ TRACE_EVENT(rxrpc_tx_data,
 TRACE_EVENT(rxrpc_tx_ack,
 	    TP_PROTO(unsigned int call, rxrpc_serial_t serial,
 		     rxrpc_seq_t ack_first, rxrpc_serial_t ack_serial,
-		     u8 reason, u8 n_acks, u16 rwind),
+		     u8 reason, u8 n_acks, u16 rwind,
+		     enum rxrpc_propose_ack_trace trace),
 
-	    TP_ARGS(call, serial, ack_first, ack_serial, reason, n_acks, rwind),
+	    TP_ARGS(call, serial, ack_first, ack_serial, reason, n_acks, rwind, trace),
 
 	    TP_STRUCT__entry(
 		    __field(unsigned int,	call)
@@ -1279,6 +1281,7 @@ TRACE_EVENT(rxrpc_tx_ack,
 		    __field(u8,			reason)
 		    __field(u8,			n_acks)
 		    __field(u16,		rwind)
+		    __field(enum rxrpc_propose_ack_trace, trace)
 			     ),
 
 	    TP_fast_assign(
@@ -1289,16 +1292,18 @@ TRACE_EVENT(rxrpc_tx_ack,
 		    __entry->reason = reason;
 		    __entry->n_acks = n_acks;
 		    __entry->rwind = rwind;
+		    __entry->trace = trace;
 			   ),
 
-	    TP_printk(" c=%08x ACK  %08x %s f=%08x r=%08x n=%u rw=%u",
+	    TP_printk(" c=%08x ACK  %08x %s f=%08x r=%08x n=%u rw=%u %s",
 		      __entry->call,
 		      __entry->serial,
 		      __print_symbolic(__entry->reason, rxrpc_ack_names),
 		      __entry->ack_first,
 		      __entry->ack_serial,
 		      __entry->n_acks,
-		      __entry->rwind)
+		      __entry->rwind,
+		      __print_symbolic(__entry->trace, rxrpc_propose_ack_traces))
 	    );
 
 TRACE_EVENT(rxrpc_receive,
diff --git a/net/rxrpc/conn_event.c b/net/rxrpc/conn_event.c
index b6f15d15ecac..d669f82281e4 100644
--- a/net/rxrpc/conn_event.c
+++ b/net/rxrpc/conn_event.c
@@ -175,7 +175,8 @@ void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
 		trace_rxrpc_tx_ack(chan->call_debug_id, serial,
 				   ntohl(pkt.ack.firstPacket),
 				   ntohl(pkt.ack.serial),
-				   pkt.ack.reason, 0, rxrpc_rx_window_size);
+				   pkt.ack.reason, 0, rxrpc_rx_window_size,
+				   rxrpc_propose_ack_retransmit);
 		break;
 
 	default:
diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c
index 47796f451895..36c2597768d6 100644
--- a/net/rxrpc/output.c
+++ b/net/rxrpc/output.c
@@ -266,7 +266,7 @@ static void rxrpc_send_ack_packet(struct rxrpc_call *call, int nr_kv, size_t len
 	trace_rxrpc_tx_ack(call->debug_id, serial,
 			   ntohl(ack->firstPacket),
 			   ntohl(ack->serial), ack->reason, ack->nAcks,
-			   ntohl(trailer->rwind));
+			   ntohl(trailer->rwind), why);
 
 	rxrpc_inc_stat(call->rxnet, stat_tx_ack_send);