net/dpaa2: add link status config support

[dpdk.git] / lib / librte_kni / rte_kni_fifo.h

diff --git a/lib/librte_kni/rte_kni_fifo.h b/lib/librte_kni/rte_kni_fifo.h
index d533af0..c7cd5c2 100644 (file)
--- a/lib/librte_kni/rte_kni_fifo.h
+++ b/lib/librte_kni/rte_kni_fifo.h
@@ -1,13 +1,13 @@
 /*-
  *   BSD LICENSE
- * 
+ *
  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
  *   All rights reserved.
- * 
+ *
  *   Redistribution and use in source and binary forms, with or without
  *   modification, are permitted provided that the following conditions
  *   are met:
- * 
+ *
  *     * Redistributions of source code must retain the above copyright
  *       notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above copyright
@@ -17,7 +17,7 @@
  *     * Neither the name of Intel Corporation nor the names of its
  *       contributors may be used to endorse or promote products derived
  *       from this software without specific prior written permission.
- * 
+ *
  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
@@ -91,3 +91,12 @@ kni_fifo_get(struct rte_kni_fifo *fifo, void **data, unsigned num)
        fifo->read = new_read;
        return i;
 }
+
+/**
+ * Get the num of elements in the fifo
+ */
+static inline uint32_t
+kni_fifo_count(struct rte_kni_fifo *fifo)
+{
+       return (fifo->len + fifo->write - fifo->read) & (fifo->len - 1);
+}