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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | AUTHORS | COLOPHON |
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IBV_REREG_MR(3) Libibverbs Programmer’s Manual IBV_REREG_MR(3)
ibv_rereg_mr - re-register a memory region (MR)
#include <infiniband/verbs.h>
int ibv_rereg_mr(struct ibv_mr *mr,
int flags,
struct ibv_pd *pd,
void *addr,
size_t length,
int access);
ibv_rereg_mr() Modifies the attributes of an existing memory
region (MR) mr. Conceptually, this call performs the functions
deregister memory region followed by register memory region.
Where possible, resources are reused instead of deallocated and
reallocated.
flags is a bit-mask used to indicate which of the following
properties of the memory region are being modified. Flags should
be a combination (bit field) of:
IBV_REREG_MR_CHANGE_TRANSLATION
Change translation (location and length)
IBV_REREG_MR_CHANGE_PD
Change protection domain
IBV_REREG_MR_CHANGE_ACCESS
Change access flags
When IBV_REREG_MR_CHANGE_PD is used, pd represents the new PD this
MR should be registered to.
When IBV_REREG_MR_CHANGE_TRANSLATION is used, addr. represents
the virtual address (user-space pointer) of the new MR, while
length represents its length.
The access and other flags are represented in the field access.
This field describes the desired memory protection attributes; it
is either 0 or the bitwise OR of one or more of ibv_access_flags.
ibv_rereg_mr() returns 0 on success, otherwise an error has
occurred, enum ibv_rereg_mr_err_code represents the error as of
below.
IBV_REREG_MR_ERR_INPUT - Old MR is valid, an input error was
detected by libibverbs.
IBV_REREG_MR_ERR_DONT_FORK_NEW - Old MR is valid, failed via don’t
fork on new address range.
IBV_REREG_MR_ERR_DO_FORK_OLD - New MR is valid, failed via do fork
on old address range.
IBV_REREG_MR_ERR_CMD - MR shouldn’t be used, command error.
IBV_REREG_MR_ERR_CMD_AND_DO_FORK_NEW - MR shouldn’t be used,
command error, invalid fork state on new address range.
Even on a failure, the user still needs to call ibv_dereg_mr on
this MR.
ibv_dereg_mr(3), ibv_reg_mr(3)
Matan Barak ⟨matanb@mellanox.com⟩, Yishai Hadas
⟨yishaih@mellanox.com⟩
This page is part of the rdma-core (RDMA Core Userspace Libraries
and Daemons) project. Information about the project can be found
at ⟨https://github.com/linux-rdma/rdma-core⟩. If you have a bug
report for this manual page, send it to
linux-rdma@vger.kernel.org. This page was obtained from the
project's upstream Git repository
⟨https://github.com/linux-rdma/rdma-core.git⟩ on 2025-08-11. (At
that time, the date of the most recent commit that was found in
the repository was 2025-08-04.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
libibverbs 2016-03-13 IBV_REREG_MR(3)
Pages that refer to this page: ibv_advise_mr(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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