mlx5: Setup mlx5 vfio context

Setup mlx5 vfio context by using the ioctl API over vfio to read the
device initialization segment and other required stuff.

As part of that the applicable IOVA ranges are set to be ready for DMA
usage and the command interface is initialized.

Signed-off-by: Yishai Hadas <[email protected]>

Author: yishaih

providers/mlx5/mlx5.h

@@ -72,6 +72,7 @@ enum {
 
 enum {
 	MLX5_ADAPTER_PAGE_SIZE		= 4096,
+	MLX5_ADAPTER_PAGE_SHIFT		= 12,
 };
 
 #define MLX5_CQ_PREFIX "MLX_CQ"