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NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | RETURN VALUE | NOTES | PORT SPACE | SEE ALSO | COLOPHON |
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RDMA_CREATE_ID(3) Librdmacm Programmer's Manual RDMA_CREATE_ID(3)
rdma_create_id - Allocate a communication identifier.
#include <rdma/rdma_cma.h>
int rdma_create_id (struct rdma_event_channel *channel, struct
rdma_cm_id **id, void *context, enum rdma_port_space ps);
channel The communication channel that events associated with
the allocated rdma_cm_id will be reported on. This
may be NULL.
id A reference where the allocated communication
identifier will be returned.
context User specified context associated with the rdma_cm_id.
ps RDMA port space.
Creates an identifier that is used to track communication
information.
Returns 0 on success, or -1 on error. If an error occurs, errno
will be set to indicate the failure reason.
Rdma_cm_id's are conceptually equivalent to a socket for RDMA
communication. The difference is that RDMA communication requires
explicitly binding to a specified RDMA device before communication
can occur, and most operations are asynchronous in nature.
Asynchronous communication events on an rdma_cm_id are reported
through the associated event channel. If the channel parameter is
NULL, the rdma_cm_id will be placed into synchronous operation.
While operating synchronously, calls that result in an event will
block until the operation completes. The event will be returned
to the user through the rdma_cm_id structure, and be available for
access until another rdma_cm call is made.
Users must release the rdma_cm_id by calling rdma_destroy_id.
Details of the services provided by the different port spaces are
outlined below.
RDMA_PS_TCP
Provides reliable, connection-oriented QP communication.
Unlike TCP, the RDMA port space provides message, not
stream, based communication.
RDMA_PS_UDP
Provides unreliable, connectionless QP communication.
Supports both datagram and multicast communication.
RDMA_PS_IB
Provides for any IB services (UD, UC, RC, XRC, etc.).
rdma_cm(7), rdma_create_event_channel(3), rdma_destroy_id(3),
rdma_get_devices(3), rdma_bind_addr(3), rdma_resolve_addr(3),
rdma_connect(3), rdma_listen(3), rdma_set_option(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_CREATE_ID(3)
Pages that refer to this page: rdma_bind_addr(3), rdma_connect(3), rdma_dereg_mr(3), rdma_destroy_id(3), rdma_getaddrinfo(3), rdma_migrate_id(3), rdma_post_recv(3), rdma_post_recvv(3), rdma_reg_msgs(3), rdma_reg_read(3), rdma_reg_write(3), rdma_resolve_addr(3), rdma_set_option(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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