ring: add a function to return the ring size

Applications and other libraries should not be reading inside the
rte_ring structure directly to get the ring size. Instead add a fn
to allow it to be queried.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Olivier Matz <olivier.matz@6wind.com>

diff --git a/lib/librte_ring/rte_ring.h b/lib/librte_ring/rte_ring.h
index e359aff..72ccca5 100644 (file)
--- a/lib/librte_ring/rte_ring.h
+++ b/lib/librte_ring/rte_ring.h
@@ -1107,6 +1107,20 @@ rte_ring_free_count(const struct rte_ring *r)
        return (cons_tail - prod_tail - 1) & r->prod.mask;
 }
 
+/**
+ * Return the size of the ring.
+ *
+ * @param r
+ *   A pointer to the ring structure.
+ * @return
+ *   The number of elements which can be stored in the ring.
+ */
+static inline unsigned int
+rte_ring_get_size(const struct rte_ring *r)
+{
+       return r->prod.size;
+}
+
 /**
  * Dump the status of all rings on the console
  *