[PATCH] e1000: Fix collision distance

Fixed the collision distance for 82543 controllers and newer.

Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: John Ronciak <john.ronciak@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/net/e1000/e1000_hw.h b/drivers/net/e1000/e1000_hw.h
index 1ddfd56fc5df..600570ff254b 100644
--- a/drivers/net/e1000/e1000_hw.h
+++ b/drivers/net/e1000/e1000_hw.h
@@ -2078,7 +2078,10 @@ struct e1000_host_command_info {
 /* Collision related configuration parameters */
 #define E1000_COLLISION_THRESHOLD       15
 #define E1000_CT_SHIFT                  4
-#define E1000_COLLISION_DISTANCE        64
+/* Collision distance is a 0-based value that applies to
+ * half-duplex-capable hardware only. */
+#define E1000_COLLISION_DISTANCE        63
+#define E1000_COLLISION_DISTANCE_82542  64
 #define E1000_FDX_COLLISION_DISTANCE    E1000_COLLISION_DISTANCE
 #define E1000_HDX_COLLISION_DISTANCE    E1000_COLLISION_DISTANCE
 #define E1000_COLD_SHIFT                12