rxrpc: Add a tracepoint to log ACK transmission

Add a tracepoint to log information about ACK transmission.

Signed-off-by: David Howels <dhowells@redhat.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c
index 0b21ed859de7..2c9daeadce87 100644
--- a/net/rxrpc/output.c
+++ b/net/rxrpc/output.c
@@ -38,12 +38,14 @@ struct rxrpc_pkt_buffer {
 static size_t rxrpc_fill_out_ack(struct rxrpc_call *call,
                                  struct rxrpc_pkt_buffer *pkt)
 {
+        rxrpc_serial_t serial;
         rxrpc_seq_t hard_ack, top, seq;
         int ix;
         u32 mtu, jmax;
         u8 *ackp = pkt->acks;
 
         /* Barrier against rxrpc_input_data(). */
+        serial = call->ackr_serial;
         hard_ack = READ_ONCE(call->rx_hard_ack);
         top = smp_load_acquire(&call->rx_top);
 
@@ -51,7 +53,7 @@ static size_t rxrpc_fill_out_ack(struct rxrpc_call *call,
         pkt->ack.maxSkew        = htons(call->ackr_skew);
         pkt->ack.firstPacket    = htonl(hard_ack + 1);
         pkt->ack.previousPacket = htonl(call->ackr_prev_seq);
-        pkt->ack.serial         = htonl(call->ackr_serial);
+        pkt->ack.serial         = htonl(serial);
         pkt->ack.reason         = call->ackr_reason;
         pkt->ack.nAcks          = top - hard_ack;
 
@@ -75,6 +77,9 @@ static size_t rxrpc_fill_out_ack(struct rxrpc_call *call,
         pkt->ackinfo.rwind      = htonl(call->rx_winsize);
         pkt->ackinfo.jumbo_max  = htonl(jmax);
 
+        trace_rxrpc_tx_ack(call, hard_ack + 1, serial, call->ackr_reason,
+                           top - hard_ack);
+
         *ackp++ = 0;
         *ackp++ = 0;
         *ackp++ = 0;