1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/net/gianfar.h b/drivers/net/gianfar.h
index 1bdb50c7936e..1ebf7ac27a3d 100644
--- a/drivers/net/gianfar.h
+++ b/drivers/net/gianfar.h
@@ -196,6 +196,12 @@ extern const char gfar_driver_version[];
 #define DEFAULT_TXIC mk_ic_value(DEFAULT_TXCOUNT, DEFAULT_TXTIME)
 #define DEFAULT_RXIC mk_ic_value(DEFAULT_RXCOUNT, DEFAULT_RXTIME)
 
+#define skip_bd(bdp, stride, base, ring_size) ({ \
+        typeof(bdp) new_bd = (bdp) + (stride); \
+        (new_bd >= (base) + (ring_size)) ? (new_bd - (ring_size)) : new_bd; })
+
+#define next_bd(bdp, base, ring_size) skip_bd(bdp, 1, base, ring_size)
+
 #define RCTRL_PAL_MASK          0x001f0000
 #define RCTRL_VLEX              0x00002000
 #define RCTRL_FILREN            0x00001000