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HTML rendering created 2026-09-09 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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NAME | DESCRIPTION | SEE ALSO | AUTHORS | COLOPHON |
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IONICDV(7) Ionic Programmer’s Manual IONICDV(7)
ionicdv - Direct verbs for ionic devices
This provides low level access to ionic devices to perform direct
operations, without general branching performed by libibverbs.
The libibverbs API is an abstract one. It is agnostic to any
underlying provider specific implementation. While this
abstraction has the advantage of user applications portability, it
has a performance penalty. For some applications optimizing
performance is more important than portability.
The ionic direct verbs API is intended for such applications. It
exposes ionic specific low level operations, allowing the
application to bypass the libibverbs API.
The direct include of ionic_dv.h together with linkage to the
ionic library will allow usage of this new interface.
UDMA Pipelines
Ionic devices expose multiple UDMA pipelines. Queues can be
assigned to specific pipelines by setting a UDMA mask on the
protection domain before creating queues. Use
ionic_dv_ctx_get_udma_count(3) and ionic_dv_ctx_get_udma_mask(3)
to query the available pipelines, and ionic_dv_pd_set_udma_mask(3)
to restrict queue placement.
Controller Memory Bar (CMB)
Send and receive queues can optionally be placed in the controller
memory bar for lower latency doorbell operations. Express
doorbell optimizations may also be enabled. Use
ionic_dv_pd_set_sqcmb(3) and ionic_dv_pd_set_rqcmb(3) to configure
CMB preferences on a protection domain before creating queues.
ionic_dv_ctx_get_udma_count(3), ionic_dv_ctx_get_udma_mask(3),
ionic_dv_pd_get_udma_mask(3), ionic_dv_pd_set_udma_mask(3),
ionic_dv_pd_set_sqcmb(3), ionic_dv_pd_set_rqcmb(3), verbs(7)
Advanced Micro Devices, Inc.
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 2026-08-04. (At
that time, the date of the most recent commit that was found in
the repository was 2026-07-22.) 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
ionic 2025-06-23 IONICDV(7)
Pages that refer to this page: ionic_dv_ctx_get_udma_count(3), ionic_dv_ctx_get_udma_mask(3), ionic_dv_pd_get_udma_mask(3), ionic_dv_pd_set_rqcmb(3), ionic_dv_pd_set_sqcmb(3), ionic_dv_pd_set_udma_mask(3)
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HTML rendering created 2026-09-09 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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