mlx4dv(7) — Linux manual page


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
       operations, without general branching performed by

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 <>

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 ⟨⟩.  If you have a bug
       report for this manual page, send it to  This page was obtained from the
       project's upstream Git repository
       ⟨⟩ on 2021-06-20.  (At
       that time, the date of the most recent commit that was found in
       the repository was 2021-06-16.)  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

1.0.0                          2017-04-19                      MLX4DV(7)

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