arch-wrpc: add delay-rx fault

This tool can be used to force overflows of the input fifo. Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

arch-wrpc: add delay-rx fault
This tool can be used to force overflows of the input fifo. Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
3b780518 · Alessandro Rubini · Adam Wujek · e9af8b78 · 3b780518 · 3b780518
Commit 3b780518 authored Feb 20, 2017 by Alessandro Rubini Committed by Adam Wujek Feb 27, 2017
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faults.c arch-wrpc/faults.c +8 -0

wrpc-socket.c time-wrpc/wrpc-socket.c +4 -0

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--- a/arch-wrpc/faults.c
+++ b/arch-wrpc/faults.c
@@ -11,6 +11,7 @@
 #include "syscon.h"
 extern struct pp_instance ppi_static;
+extern int frame_rx_delay_us;
 static int cmd_fault(const char *args[])
 {
@@ -26,7 +27,14 @@ static int cmd_fault(const char *args[])
 			  ppg->rxdrop, ppg->txdrop);
 		return 0;
 	}
+	if (args[0] && !strcmp(args[0], "delay")) {
+		if (args[1])
+			fromdec(args[1], &frame_rx_delay_us);
+		pp_printf("delaying %i us on rx frame\n", frame_rx_delay_us);
+		return 0;
+	}
 	pp_printf("Use: \"fault drop [<rxdrop> <txdrop>]\" (0..999)\n");
+	pp_printf("     \"fault delay [<usecs>]\"\n");
 	return -EINVAL;
 }

--- a/time-wrpc/wrpc-socket.c
+++ b/time-wrpc/wrpc-socket.c
@@ -7,8 +7,11 @@
 #include <ppsi/ppsi.h>
 #include "ptpdump.h"
+#include <syscon.h> /* wrpc-sw */
 #include <ptpd_netif.h> /* wrpc-sw */
+int frame_rx_delay_us; /* set by faults.c */
 /*
 * we know we create one socket only in wrpc. The buffer size used to be
 * 512. Let's keep it unchanged, because we might enqueue a few frames.
@@ -79,6 +82,7 @@ static int wrpc_net_recv(struct pp_instance *ppi, void *pkt, int len,
 		pp_diag(ppi, frames, 1, "Drop received frame\n");
 		return -2;
 	}
+	usleep(frame_rx_delay_us);
 	return got;
 }