[PATCH net-next 5/7] rxrpc: Add tracepoints to record received packets and end of data_ready

[David Howells]

Add two tracepoints:

 (1) Record the RxRPC protocol header of packets retrieved from the UDP
     socket by the data_ready handler.

 (2) Record the outcome of the data_ready handler.

Signed-off-by: David Howells <dhowe...@redhat.com>
---

 include/trace/events/rxrpc.h |   38 ++++++++++++++++++++++++++++++++++++++
 net/rxrpc/input.c            |    8 ++++++--
 2 files changed, 44 insertions(+), 2 deletions(-)

diff --git a/include/trace/events/rxrpc.h b/include/trace/events/rxrpc.h
index 6b06cf050bc0..ea3b10ed91a8 100644
--- a/include/trace/events/rxrpc.h
+++ b/include/trace/events/rxrpc.h
@@ -80,6 +80,44 @@ TRACE_EVENT(rxrpc_skb,
                      __entry->where)
            );
 
+TRACE_EVENT(rxrpc_rx_packet,
+           TP_PROTO(struct rxrpc_skb_priv *sp),
+
+           TP_ARGS(sp),
+
+           TP_STRUCT__entry(
+                   __field_struct(struct rxrpc_host_header,    hdr             
)
+                            ),
+
+           TP_fast_assign(
+                   memcpy(&__entry->hdr, &sp->hdr, sizeof(__entry->hdr));
+                          ),
+
+           TP_printk("%08x:%08x:%08x:%04x %08x %08x %02x %02x",
+                     __entry->hdr.epoch, __entry->hdr.cid,
+                     __entry->hdr.callNumber, __entry->hdr.serviceId,
+                     __entry->hdr.serial, __entry->hdr.seq,
+                     __entry->hdr.type, __entry->hdr.flags)
+           );
+
+TRACE_EVENT(rxrpc_rx_done,
+           TP_PROTO(int result, int abort_code),
+
+           TP_ARGS(result, abort_code),
+
+           TP_STRUCT__entry(
+                   __field(int,                        result          )
+                   __field(int,                        abort_code      )
+                            ),
+
+           TP_fast_assign(
+                   __entry->result = result;
+                   __entry->abort_code = abort_code;
+                          ),
+
+           TP_printk("r=%d a=%d", __entry->result, __entry->abort_code)
+           );
+
 TRACE_EVENT(rxrpc_abort,
            TP_PROTO(const char *why, u32 cid, u32 call_id, rxrpc_seq_t seq,
                     int abort_code, int error),
diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c
index 8e624109750a..6c4b7df05e95 100644
--- a/net/rxrpc/input.c
+++ b/net/rxrpc/input.c
@@ -683,6 +683,7 @@ void rxrpc_data_ready(struct sock *sk)
        /* dig out the RxRPC connection details */
        if (rxrpc_extract_header(sp, skb) < 0)
                goto bad_message;
+       trace_rxrpc_rx_packet(sp);
 
        _net("Rx RxRPC %s ep=%x call=%x:%x",
             sp->hdr.flags & RXRPC_CLIENT_INITIATED ? "ToServer" : "ToClient",
@@ -767,6 +768,7 @@ discard_unlock:
 out_unlock:
        rcu_read_unlock();
 out:
+       trace_rxrpc_rx_done(0, 0);
        return;
 
 cant_route_call:
@@ -780,7 +782,7 @@ cant_route_call:
                        skb_queue_tail(&local->accept_queue, skb);
                        rxrpc_queue_work(&local->processor);
                        _leave(" [incoming]");
-                       return;
+                       goto out;
                }
                skb->priority = RX_INVALID_OPERATION;
        } else {
@@ -789,7 +791,7 @@ cant_route_call:
 
        if (sp->hdr.type != RXRPC_PACKET_TYPE_ABORT) {
                _debug("reject type %d",sp->hdr.type);
-               rxrpc_reject_packet(local, skb);
+               goto reject_packet;
        } else {
                rxrpc_free_skb(skb);
        }
@@ -798,6 +800,8 @@ cant_route_call:
 
 bad_message:
        skb->priority = RX_PROTOCOL_ERROR;
+reject_packet:
+       trace_rxrpc_rx_done(skb->mark, skb->priority);
        rxrpc_reject_packet(local, skb);
        _leave(" [badmsg]");
 }