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path: root/drivers/net/e1000/e1000_hw.h
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Diffstat (limited to 'drivers/net/e1000/e1000_hw.h')
-rw-r--r--drivers/net/e1000/e1000_hw.h5
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
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