NAME | DESCRIPTION | NOTES | SEE ALSO | AUTHORS | COLOPHON

MLX4DV(7)             Miscellaneous Information Manual             MLX4DV(7)

NAME         top

       mlx4dv - Direct verbs for mlx4 devices
       This  is low level access to mlx4 devices to perform data path opera‐
       tions, without general branching performed by ibv_post_send(3).

DESCRIPTION         top

       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 mlx4 direct verbs API is intended for such applications.  It
       exposes mlx4 specific low level data path (send/receive/completion)
       operations, allowing the application to bypass the libibverbs data
       path API.

       This interface consists from one hardware specific header file with
       relevant inline functions and conversion logic from ibverbs
       structures to mlx4 specific structures.

       The direct include of mlx4dv.h together with linkage to mlx4 library
       will allow usage of this new interface.

       Once an application uses the direct flow the locking scheme is fully
       managed by itself. There is an expectation that no mixed flows in the
       data path for both direct/non-direct access will be by same
       application.

NOTES         top


SEE ALSO         top

       ibv_post_send(3), verbs(7)

AUTHORS         top

       Maor Gottlieb <maorg@mellanox.com>

COLOPHON         top

       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 2019-07-28.  (At
       that time, the date of the most recent commit that was found in the
       repository was 2019-07-25.)  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

1.0.0                            2017-04-19                        MLX4DV(7)

Pages that refer to this page: mlx4dv_init_obj(3)mlx4dv_query_device(3)