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ibv_open_qp(3) — Linux manual page

IBV_OPEN_QP(3)        Libibverbs Programmer's ManualIBV_OPEN_QP(3)

NAME        top

       ibv_open_qp - open a shareable queue pair (QP)

SYNOPSIS        top

#include <infiniband/verbs.h>struct ibv_qp *ibv_open_qp(struct ibv_context*context,struct ibv_qp_open_attr*qp_open_attr);

DESCRIPTION        top

ibv_open_qp()opens an existing queue pair (QP) associated with       the extended protection domainxrcd.  The argumentqp_open_attr is       an ibv_qp_open_attr struct, as defined in <infiniband/verbs.h>.       struct ibv_qp_open_attr {               uint32_t          comp_mask;  /* Identifies valid fields */               uint32_t          qp_num;     /* QP number */               struct            *ibv_xrcd;  /* XRC domain */               void             *qp_context; /* User defined opaque value */               enum ibv_qp_type  qp_type;    /* QP transport service type */ibv_destroy_qp()closes the opened QP and destroys the underlying       QP if it has no other references.qp.

RETURN VALUE        top

ibv_open_qp()returns a pointer to the opened QP, or NULL if the       request fails.  Check the QP number (qp_num) in the returned QP.

NOTES        top

ibv_open_qp()will fail if a it is asked to open a QP that does       not exist within the xrcd with the specified qp_num and qp_type.

SEE ALSO        top

ibv_alloc_pd(3),ibv_create_qp(3),ibv_create_qp_ex(3),ibv_modify_qp(3),ibv_query_qp(3)

AUTHORS        top

       Sean Hefty <sean.hefty@intel.com>

COLOPHON        top

       This page is part of therdma-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 isnot part of the original manual page), send a mail to       man-pages@man7.orglibibverbs                      2011-08-12IBV_OPEN_QP(3)

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