|
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. |
|
|
NAME | DESCRIPTION | SEE ALSO | AUTHORS | COLOPHON |
|
|
|
MANADV(7) MANA Direct Verbs Manual MANADV(7)
manadv - Direct verbs for mana devices
This provides low level access to mana 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 mana direct verbs API is intended for such applications. It
exposes mana specific low level operations, allowing the
application to bypass the libibverbs API.
This version of the driver supports one QP type:
IBV_QPT_RAW_PACKET. To use this QP type, the application is
required to use manadv_set_context_attr() to set external buffer
allocators for allocating queues, and use manadv_init_obj() to
obtain all the queue information. The application implements its
own queue operations, bypassing libibverbs API for
sending/receiving traffic over the queues. At hardware layer,
IBV_QPT_RAW_PACKET QP shares the same hardware resource as the
Ethernet port used in the kernel. The software checks for
exclusive use of the hardware Ethernet port, and will fail the QP
creation if the port is already in use. To create a
IBV_QPT_RAW_PACKET on a specified port, the user needs to
configure the system in such a way that this port is not used by
any other software (including the Kernel). If the port is used,
ibv_create_qp() will fail with errno set to EBUSY.
The direct include of manadv.h together with linkage to mana
library will allow usage of this new interface.
verbs(7)
Long Li ⟨longli@microsoft.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
mana 2022-05-16 MANADV(7)
|
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. |
|