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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | AUTHORS | COLOPHON |
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IBV_CREATE_QP(3) Libibverbs Programmer's Manual IBV_CREATE_QP(3)
ibv_create_qp, ibv_destroy_qp - create or destroy a queue pair
(QP)
#include <infiniband/verbs.h>
struct ibv_qp *ibv_create_qp(struct ibv_pd *pd,
struct ibv_qp_init_attr *qp_init_attr);
int ibv_destroy_qp(struct ibv_qp *qp);
ibv_create_qp() creates a queue pair (QP) associated with the
protection domain pd. The argument qp_init_attr is an
ibv_qp_init_attr struct, as defined in <infiniband/verbs.h>.
struct ibv_qp_init_attr {
void *qp_context; /* Associated context of the QP */
struct ibv_cq *send_cq; /* CQ to be associated with the Send Queue (SQ) */
struct ibv_cq *recv_cq; /* CQ to be associated with the Receive Queue (RQ) */
struct ibv_srq *srq; /* SRQ handle if QP is to be associated with an SRQ, otherwise NULL */
struct ibv_qp_cap cap; /* QP capabilities */
enum ibv_qp_type qp_type; /* QP Transport Service Type: IBV_QPT_RC, IBV_QPT_UC, IBV_QPT_UD, IBV_QPT_RAW_PACKET or IBV_QPT_DRIVER */
int sq_sig_all; /* If set, each Work Request (WR) submitted to the SQ generates a completion entry */
};
struct ibv_qp_cap {
uint32_t max_send_wr; /* Requested max number of outstanding WRs in the SQ */
uint32_t max_recv_wr; /* Requested max number of outstanding WRs in the RQ */
uint32_t max_send_sge; /* Requested max number of scatter/gather (s/g) elements in a WR in the SQ */
uint32_t max_recv_sge; /* Requested max number of s/g elements in a WR in the RQ */
uint32_t max_inline_data;/* Requested max number of data (bytes) that can be posted inline to the SQ, otherwise 0 */
};
The function ibv_create_qp() will update the qp_init_attr->cap
struct with the actual QP values of the QP that was created; the
values will be greater than or equal to the values requested.
ibv_destroy_qp() destroys the QP qp.
ibv_create_qp() returns a pointer to the created QP, or NULL if
the request fails. Check the QP number (qp_num) in the returned
QP.
ibv_destroy_qp() returns 0 on success, or the value of errno on
failure (which indicates the failure reason).
ibv_create_qp() will fail if a it is asked to create QP of a type
other than IBV_QPT_RC or IBV_QPT_UD associated with an SRQ.
The attributes max_recv_wr and max_recv_sge are ignored by
ibv_create_qp() if the QP is to be associated with an SRQ.
ibv_destroy_qp() fails if the QP is attached to a multicast group.
IBV_QPT_DRIVER does not represent a specific service and is used
for vendor specific QP logic.
ibv_alloc_pd(3), ibv_modify_qp(3), ibv_query_qp(3)
Dotan Barak <dotanba@gmail.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 2006-10-31 IBV_CREATE_QP(3)
Pages that refer to this page: ibv_alloc_pd(3), ibv_attach_mcast(3), ibv_create_cq(3), ibv_create_cq_ex(3), ibv_detach_mcast(3), ibv_modify_qp(3), ibv_modify_qp_rate_limit(3), ibv_open_qp(3), ibv_post_recv(3), ibv_post_send(3), ibv_post_srq_recv(3), ibv_query_port(3), ibv_query_qp(3), rdma_create_qp(3), rdma_destroy_qp(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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