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ibv_open_device(3) — Linux manual page

IBV_OPEN_DEVICE(3)    Libibverbs Programmer's ManualIBV_OPEN_DEVICE(3)

NAME        top

       ibv_open_device, ibv_close_device - open and close an RDMA device       context

SYNOPSIS        top

#include <infiniband/verbs.h>struct ibv_context *ibv_open_device(struct ibv_device*device);int ibv_close_device(struct ibv_context*context);

DESCRIPTION        top

ibv_open_device()opens the devicedevice and creates a context       for further use.ibv_close_device()closes the device contextcontext.

RETURN VALUE        top

ibv_open_device()returns a pointer to the allocated device       context, or NULL if the request fails.ibv_close_device()returns 0 on success, -1 on failure.

NOTES        top

ibv_close_device()does not release all the resources allocated       using contextcontext.  To avoid resource leaks, the user should       release all associated resources before closing a context.       Setting the environment variable **RDMAV_ALLOW_DISASSOC_DESTROY**       tells the library to relate an EIO from destroy commands as a       success as the kernel resources were already released. This comes       to prevent memory leakage in the user space area upon device       disassociation. Applications using this flag cannot call       ibv_get_cq_event or ibv_get_async_event concurrently with any call       to an object destruction function.

SEE ALSO        top

ibv_get_device_list(3),ibv_query_device(3),ibv_query_port(3),ibv_query_gid(3),ibv_query_pkey(3)

AUTHORS        top

       Dotan Barak <dotanba@gmail.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                      2006-10-31IBV_OPEN_DEVICE(3)

Pages that refer to this page:ibv_create_ah_from_wc(3), ibv_create_comp_channel(3), ibv_free_device_list(3), ibv_get_async_event(3), ibv_get_device_guid(3), ibv_get_device_index(3), ibv_get_device_list(3), ibv_get_device_name(3), ibv_get_pkey_index(3), ibv_import_device(3), ibv_query_device(3), ibv_query_device_ex(3), ibv_query_gid(3), ibv_query_gid_ex(3), ibv_query_gid_table(3), ibv_query_pkey(3), ibv_query_rt_values_ex(3)

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