ibv_import_dm — import an DM from a given ibv_context
ibv_unimport_dm — unimport an DM
#include <infiniband/verbs.h> struct ibv_dm *ibv_import_dm(struct ibv_context *context, uint32_t dm_handle); void ibv_unimport_dm(struct ibv_dm *dm)
ibv_import_dm() returns a Device memory (DM) that is associated with the given dm_handle in the RDMA context.
The input dm_handle value must be a valid kernel handle for an DM object in the assosicated RDMA context. It can be achieved from the original DM by getting its ibv_dm->handle member value.
ibv_unimport_dm() un import the DM. Once the DM usage has been ended ibv_free_dm() or ibv_unimport_dm() 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 DM. Once destroy is done no other process can touch the object except for unimport. All users of the context must collaborate to ensure this.
ibv_import_dm() returns a pointer to the allocated DM, or NULL if the request fails and errno is set.
Maor Gottlieb <firstname.lastname@example.org>
The man page ibv_unimport_dm(3) is an alias of ibv_import_dm(3).