[PATCH net-next 13/15] rxrpc: Add a tracepoint to log injected Rx packet loss

[David Howells]

Add a tracepoint to log received packets that get discarded due to Rx
packet loss.

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

 include/trace/events/rxrpc.h |   21 +++++++++++++++++++++
 net/rxrpc/input.c            |   11 +++++------
 2 files changed, 26 insertions(+), 6 deletions(-)

diff --git a/include/trace/events/rxrpc.h b/include/trace/events/rxrpc.h
index 6001bf93dc79..9413b17ba04b 100644
--- a/include/trace/events/rxrpc.h
+++ b/include/trace/events/rxrpc.h
@@ -484,6 +484,27 @@ TRACE_EVENT(rxrpc_timer,
                      __entry->timer - __entry->now)
            );
 
+TRACE_EVENT(rxrpc_rx_lose,
+           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 %s *LOSE*",
+                     __entry->hdr.epoch, __entry->hdr.cid,
+                     __entry->hdr.callNumber, __entry->hdr.serviceId,
+                     __entry->hdr.serial, __entry->hdr.seq,
+                     __entry->hdr.type, __entry->hdr.flags,
+                     __entry->hdr.type <= 15 ? rxrpc_pkts[__entry->hdr.type] : 
"?UNK")
+           );
+
 #endif /* _TRACE_RXRPC_H */
 
 /* This part must be outside protection */
diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c
index fb3e2f6afa3b..19b1e189f5dc 100644
--- a/net/rxrpc/input.c
+++ b/net/rxrpc/input.c
@@ -837,20 +837,19 @@ void rxrpc_data_ready(struct sock *udp_sk)
        skb_orphan(skb);
        sp = rxrpc_skb(skb);
 
+       /* dig out the RxRPC connection details */
+       if (rxrpc_extract_header(sp, skb) < 0)
+               goto bad_message;
+
        if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) {
                static int lose;
                if ((lose++ & 7) == 7) {
+                       trace_rxrpc_rx_lose(sp);
                        rxrpc_lose_skb(skb, rxrpc_skb_rx_lost);
                        return;
                }
        }
 
-       _net("Rx UDP packet from %08x:%04hu",
-            ntohl(ip_hdr(skb)->saddr), ntohs(udp_hdr(skb)->source));
-
-       /* 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",