aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/gianfar.h
diff options
context:
space:
mode:
authorAndy Fleming <afleming@freescale.com>2008-12-16 15:33:40 -0800
committerDavid S. Miller <davem@davemloft.net>2008-12-16 15:33:40 -0800
commit31de198b4d2732028f4c5bff04b0103b1d8c1d8c (patch)
tree63b971edc7f662d402769cfaf3c50465f3aab48d /drivers/net/gianfar.h
parenta22823e72a4821ce1d4a248fbd8f5a81795af339 (diff)
gianfar: Add macros for stepping through BDs
This code is based strongly on code from Dai Haruki <Dai.Haruki@freescale.com>. The gianfar Buffer Descriptors are arranged in a circular array, the end of which is denoted by setting the "WRAP" bit in the descriptor. However, the software knows the end of the ring because it knows how many descriptors are there. Rather than check each descriptor for whether the WRAP bit is set, use pointer math to determine where the next BD is. This is also useful for when we want to look at BDs other than the very next one (for Scatter-Gather). Signed-off-by: Andy Fleming <afleming@freescale.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/gianfar.h')
-rw-r--r--drivers/net/gianfar.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/net/gianfar.h b/drivers/net/gianfar.h
index 1bdb50c7936..1ebf7ac27a3 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