diff --git a/include/linux/mlx4/cmd.h b/include/linux/mlx4/cmd.h
index ae62630..9958ff2 100644
--- a/include/linux/mlx4/cmd.h
+++ b/include/linux/mlx4/cmd.h
@@ -225,4 +225,6 @@
 
 u32 mlx4_comm_get_version(void);
 
+#define MLX4_COMM_GET_IF_REV(cmd_chan_ver) (u8)((cmd_chan_ver) >> 8)
+
 #endif /* MLX4_CMD_H */