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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | NOTES | STATIC LINKING | SEE ALSO | AUTHOR | COLOPHON |
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IBV_GET...ICE_LIST(3) Libibverbs Programmer’s ManualIBV_GET...ICE_LIST(3)
ibv_get_device_list, ibv_free_device_list - get and release list
of available RDMA devices
#include <infiniband/verbs.h>
struct ibv_device **ibv_get_device_list(int *num_devices);
void ibv_free_device_list(struct ibv_device **list);
ibv_get_device_list() returns a NULL-terminated array of RDMA
devices currently available. The argument num_devices is
optional; if not NULL, it is set to the number of devices returned
in the array.
ibv_free_device_list() frees the array of devices list returned by
ibv_get_device_list().
ibv_get_device_list() returns the array of available RDMA devices,
or sets errno and returns NULL if the request fails. If no
devices are found then num_devices is set to 0, and non-NULL is
returned.
ibv_free_device_list() returns no value.
EPERM Permission denied.
ENOSYS No kernel support for RDMA.
ENOMEM Insufficient memory to complete the operation.
Client code should open all the devices it intends to use with
ibv_open_device() before calling ibv_free_device_list(). Once it
frees the array with ibv_free_device_list(), it will be able to
use only the open devices; pointers to unopened devices will no
longer be valid.
Setting the environment variable IBV_SHOW_WARNINGS will cause
warnings to be emitted to stderr if a kernel verbs device is
discovered, but no corresponding userspace driver can be found for
it.
If libibverbs is statically linked to the application then all
provider drivers must also be statically linked. The library will
not load dynamic providers when static linking is used.
To link the providers set the RDMA_STATIC_PROVIDERS define to the
comma separated list of desired providers when compiling the
application. The special keyword `all' will statically link all
supported libibverbs providers.
This is intended to be used along with pkg-config(1) to setup the
proper flags for libibverbs linking.
If this is not done then ibv_get_device_list will always return an
empty list.
Using only dynamic linking for libibverbs applications is strongly
recommended.
ibv_fork_init(3), ibv_get_device_guid(3), ibv_get_device_name(3),
ibv_get_device_index(3), ibv_open_device(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_GET...ICE_LIST(3)
Pages that refer to this page: ibv_fork_init(3), ibv_get_device_guid(3), ibv_get_device_index(3), ibv_get_device_name(3), ibv_open_device(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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