IB/mlx5: Manage indirection mkey upon DEVX flow for ODP

Manage indirection mkey upon DEVX flow to support ODP.

To support a page fault event on the indirection mkey it needs to be part
of the device mkey radix tree.

Both the creation and the deletion flows for a DEVX object which is
indirection mkey were adapted to handle that.

Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Reviewed-by: Artemy Kovalyov <artemyko@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/mlx5/mlx5_ib.h

@@ -602,6 +602,12 @@ struct mlx5_ib_mw {
 	int			ndescs;
 };
 
+struct mlx5_ib_devx_mr {
+	struct mlx5_core_mkey	mmkey;
+	int			ndescs;
+	struct rcu_head		rcu;
+};
+
 struct mlx5_ib_umr_context {
 	struct ib_cqe		cqe;
 	enum ib_wc_status	status;