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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | AUTHORS | COLOPHON |
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IBV_ALLOC_MW(3) Libibverbs Programmer's Manual IBV_ALLOC_MW(3)
ibv_alloc_mw, ibv_dealloc_mw - allocate or deallocate a memory
window (MW)
#include <infiniband/verbs.h>
struct ibv_mw *ibv_alloc_mw(struct ibv_pd *pd,
enum ibv_mw_type type);
int ibv_dealloc_mw(struct ibv_mw *mw);
ibv_alloc_mw() allocates a memory window (MW) associated with the
protection domain pd. The MW's type (1 or 2A/2B) is type.
The MW is created not bound. For it to be useful, the MW must be
bound, through either ibv_bind_mw (type 1) or a special WR (type
2). Once bound, the memory window allows RDMA (remote) access to
a subset of the MR to which it was bound, until invalidated by:
ibv_bind_mw verb with zero length for type 1,
IBV_WR_LOCAL_INV/IBV_WR_SEND_WITH_INV WR opcode for type 2,
deallocation.
ibv_dealloc_mw() Unbinds in case was previously bound and
deallocates the MW mw.
ibv_alloc_mw() returns a pointer to the allocated MW, or NULL if
the request fails. The remote key (R_Key) field rkey is used by
remote processes to perform Atomic and RDMA operations. This key
will be changed during bind operations. The remote process places
this rkey as the rkey field of struct ibv_send_wr passed to the
ibv_post_send function.
ibv_dealloc_mw() returns 0 on success, or the value of errno on
failure (which indicates the failure reason).
ibv_dereg_mr() fails if any memory window is still bound to this
MR.
ibv_alloc_pd(3), ibv_post_send(3), ibv_bind_mw(3), ibv_reg_mr(3),
Majd Dibbiny <majd@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 2024-06-14. (At
that time, the date of the most recent commit that was found in
the repository was 2024-06-10.) 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 2016-02-02 IBV_ALLOC_MW(3)
Pages that refer to this page: ibv_bind_mw(3)
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HTML rendering created 2024-06-26 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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