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NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | COLOPHON |
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RDMA_CREATE_QP(3) Librdmacm Programmer's Manual RDMA_CREATE_QP(3)
rdma_create_qp - Allocate a QP.
#include <rdma/rdma_cma.h>
int rdma_create_qp (struct rdma_cm_id *id, struct ibv_pd *pd,
struct ibv_qp_init_attr *qp_init_attr);
id RDMA identifier.
pd Optional protection domain for the QP.
qp_init_attr
Initial QP attributes.
Allocate a QP associated with the specified rdma_cm_id and
transition it for sending and receiving.
Returns 0 on success, or -1 on error. If an error occurs, errno
will be set to indicate the failure reason.
The rdma_cm_id must be bound to a local RDMA device before calling
this function, and the protection domain must be for that same
device. QPs allocated to an rdma_cm_id are automatically
transitioned by the librdmacm through their states. After being
allocated, the QP will be ready to handle posting of receives. If
the QP is unconnected, it will be ready to post sends.
If a protection domain is not given - pd parameter is NULL - then
the rdma_cm_id will be created using a default protection domain.
One default protection domain is allocated per RDMA device.
The initial QP attributes are specified by the qp_init_attr
parameter. The send_cq and recv_cq fields in the ibv_qp_init_attr
are optional. If a send or receive completion queue is not
specified, then a CQ will be allocated by the rdma_cm for the QP,
along with corresponding completion channels. Completion channels
and CQ data created by the rdma_cm are exposed to the user through
the rdma_cm_id structure.
The actual capabilities and properties of the created QP will be
returned to the user through the qp_init_attr parameter. An
rdma_cm_id may only be associated with a single QP.
rdma_bind_addr(3), rdma_resolve_addr(3), rdma_destroy_qp(3),
ibv_create_qp(3), ibv_modify_qp(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 2007-05-15 RDMA_CREATE_QP(3)
Pages that refer to this page: rdma_bind_addr(3), rdma_destroy_qp(3), rdma_getaddrinfo(3), rdma_join_multicast(3), rdma_join_multicast_ex(3), rdma_post_recv(3), rdma_post_recvv(3), rdma_resolve_addr(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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