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NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | COLOPHON |
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RDMA_REG_READ(3) Librdmacm Programmer's Manual RDMA_REG_READ(3)
rdma_reg_read - register data buffer(s) for remote RDMA read
access.
#include <rdma/rdma_verbs.h>
struct ibv_mr * rdma_reg_read (struct rdma_cm_id *id, void *addr,
size_t length);
id A reference to a communication identifier where the
message buffer(s) will be used.
addr The address of the memory buffer(s) to register.
length The total length of the memory to register.
Registers a memory buffer that will be accessed by a remote RDMA
read operation. Memory buffers registered using rdma_reg_read may
be targeted in an RDMA read request, allowing the buffer to be
specified on the remote side of an RDMA connection as the
remote_addr of rdma_post_read, or similar call.
Returns a reference to the registered memory region on success, or
NULL on error. If an error occurs, errno will be set to indicate
the failure reason.
rdma_reg_read is used to register a data buffer that will be the
target of an RDMA read operation on a queue pair associated with
an rdma_cm_id. The memory buffer is registered with the
proteection domain associated with the idenfier. The start of the
data buffer is specified through the addr parameter, and the total
size of the buffer is given by length.
All data buffers should be registered before being posted as a
work request. Users must deregister all registered memory by
calling rdma_dereg_mr.
rdma_cm(7), rdma_create_id(3), rdma_create_ep(3),
rdma_reg_msgs(3), rdma_reg_write(3), ibv_reg_mr(3),
ibv_dereg_mr(3), rdma_post_read(3)
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
librdmacm 2010-07-19 RDMA_REG_READ(3)
Pages that refer to this page: rdma_dereg_mr(3), rdma_post_read(3), rdma_post_readv(3), rdma_post_recv(3), rdma_post_recvv(3), rdma_reg_msgs(3), rdma_reg_write(3), rdma_cm(7)
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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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