Commit 89b475ab authored by David Howells's avatar David Howells
Browse files

rxrpc: Add a tracepoint to log injected Rx packet loss 



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

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
parent be832aec

include/trace/events/rxrpc.h

+21 −0
Original line number Diff line number Diff line
@@ -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 */

net/rxrpc/input.c

+5 −6
Original line number Diff line number Diff line
@@ -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",