--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rvinterf/include/limits.h	Sat Jun 11 00:13:35 2016 +0000
@@ -0,0 +1,32 @@
+/*
+ * For sizing our buffers etc in the rvinterf suite, including the local
+ * UNIX domain socket protocol between rvinterf and fc-tmsh etc, we need
+ * to have some limits on the message sizes in both host->target and
+ * target->host directions.
+ *
+ * For the host->target direction, the choice of message size limit is
+ * easy: the packet Rx code in RVT on the target side also has a limit
+ * (quite naturally, as it needs to use a static buffer to reassemble
+ * incoming packets as they arrive at the UART in unpredictable interrupt-
+ * sized chunks), so we set our limit to match that in RVT.
+ */
+
+#define	MAX_PKT_TO_TARGET	255
+
+/*
+ * In the other direction (target->host), there is no fixed limit
+ * definition easily visible in the target fw code: any fw component
+ * can call rvt_send_trace_cpy() or rvt_mem_alloc() followed by
+ * rvt_send_trace_no_cpy(), or some higher-level API that reduces to
+ * these functions, with a message of any size, subject only to memory
+ * limits, which obviously aren't as strict as a #define'd maximum
+ * message size.  Hence in this direction we use our own arbitrary
+ * choice of size limit.
+ */
+
+#define	MAX_PKT_FROM_TARGET	512
+
+/*
+ * Both limit definitions above counts all bytes between the opening and
+ * closing STX flags, but not DLEs inserted for binary transparency.
+ */