ibv_import_mr - Man Page


ibv_import_mr — import an MR from a given ibv_pd

ibv_unimport_mr — unimport an MR


#include <infiniband/verbs.h>

struct ibv_mr *ibv_import_mr(struct ibv_pd *pd, uint32_t mr_handle);
void ibv_unimport_mr(struct ibv_mr *mr)


ibv_import_mr() returns a Memory region (MR) that is associated with the given mr_handle in the RDMA context that assosicated with the given pd.

The input mr_handle value must be a valid kernel handle for an MR object in the assosicated RDMA context. It can be achieved from the original MR by getting its ibv_mr->handle member value.

ibv_unimport_mr() un import the MR. Once the MR usage has been ended ibv_dereg_mr() or ibv_unimport_mr() should be called. The first one will go to the kernel to destroy the object once the second one way cleanup what ever is needed/opposite of the import without calling the kernel.

This is the responsibility of the application to coordinate between all ibv_context(s) that use this MR. Once destroy is done no other process can touch the object except for unimport. All users of the context must collaborate to ensure this.

Return Value

ibv_import_mr() returns a pointer to the allocated MR, or NULL if the request fails.


The addr field in the imported MR is not applicable, NULL value is expected.

See Also

ibv_reg_mr(3), ibv_reg_dm_mr(3), ibv_reg_mr_iova(3), ibv_reg_mr_iova2(3), ibv_dereg_mr(3),


Yishai Hadas <yishaih@mellanox.com>

Referenced By

The man page ibv_unimport_mr(3) is an alias of ibv_import_mr(3).

2020-5-3 Libibverbs Programmer’s Manual