прямые глаголы для устройств mlx5 (Direct verbs for mlx5 devices)
Имя (Name)
mlx5dv - Direct verbs for mlx5 devices
This is low level access to mlx5 devices to perform data path
operations, without general branching performed by
ibv_post_send(3).
Описание (Description)
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 mlx5 direct verbs API is intended for such applications. It
exposes mlx5 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 mlx5 specific structures.
The direct include of mlx5dv.h together with linkage to mlx5
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.
Примечание (Note)
All Mellanox NIC devices starting from Connect-IB (Connect-IB,
ConnectX-4, ConnectX-4Lx, ConnectX-5, ...) implement the mlx5
API, thus using the mlx5 direct verbs does not limit the
applications to a single NIC HW device thus keeping some level of
portability.
Смотри также (See also)
ibv_post_send(3), verbs(7), mlx5dv_is_supported(3)
