NAME

       rdma_dereg_mr - deregisters a registered memory region.

SYNOPSIS

       #include <rdma/rdma_verbs.h>

       struct ibv_mr * rdma_dereg_mr (struct ibv_mr *mr);

ARGUMENTS

       mr          A reference to a registered memory buffer.

DESCRIPTION

       Deregisters  a  memory  buffer that had been registered for RDMA or message operations.  A
       user should call rdma_dereg_mr for all registered memory  associated  with  an  rdma_cm_id
       before destroying the rdma_cm_id.

RETURN VALUE

       Returns  0  on success, or -1 on error.  If an error occurs, errno will be set to indicate
       the failure reason.

NOTES

       All memory registered  with  an  rdma_cm_id  is  associated  with  the  protection  domain
       associated with the id.  Users must deregister all registered memory before the protection
       domain can be destroyed.

SEE ALSO

       rdma_cm(7), rdma_create_id(3), rdma_create_ep(3), rdma_destroy_id(3),  rdma_destroy_ep(3),
       rdma_reg_msgs(3), rdma_reg_read(3), rdma_reg_write(3), ibv_reg_mr(3), ibv_dereg_mr(3)