From fe47c3c2623d6914655f507a317a6b881bc7c6a4 Mon Sep 17 00:00:00 2001
From: Dwight Engen <dwight.engen@oracle.com>
Date: Thu, 11 Dec 2014 12:26:15 -0500
Subject: [PATCH] vio: create routines for inc,dec vio dring indexes

Both sunvdc and sunvnet implemented distinct functionality for incrementing
and decrementing dring indexes. Create common functions for use by both
from the sunvnet versions, which were chosen since they will still work
correctly in case a non power of two ring size is used.

Signed-off-by: Dwight Engen <dwight.engen@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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