There is also a `section dedicated to this poll mode driver
<http://www.mellanox.com/page/products_dyn?product_family=209&mtag=pmd_for_dpdk>`__.
-.. note::
-
- Due to external dependencies, this driver is disabled in default configuration
- of the "make" build. It can be enabled with ``CONFIG_RTE_LIBRTE_MLX5_PMD=y``
- or by using "meson" build system which will detect dependencies.
Design
------
Compilation options
~~~~~~~~~~~~~~~~~~~
-These options can be modified in the ``.config`` file.
-
-- ``CONFIG_RTE_LIBRTE_MLX5_PMD`` (default **n**)
-
- Toggle compilation of librte_pmd_mlx5 itself.
-
-- ``CONFIG_RTE_IBVERBS_LINK_DLOPEN`` (default **n**)
+The ibverbs libraries can be linked with this PMD in a number of ways,
+configured by the ``ibverbs_link`` build option:
- Build PMD with additional code to make it loadable without hard
- dependencies on **libibverbs** nor **libmlx5**, which may not be installed
- on the target system.
+- ``shared`` (default): the PMD depends on some .so files.
- In this mode, their presence is still required for it to run properly,
- however their absence won't prevent a DPDK application from starting (with
- ``CONFIG_RTE_BUILD_SHARED_LIB`` disabled) and they won't show up as
- missing with ``ldd(1)``.
+- ``dlopen``: Split the dependencies glue in a separate library
+ loaded when needed by dlopen.
+ It make dependencies on libibverbs and libmlx4 optional,
+ and has no performance impact.
- It works by moving these dependencies to a purpose-built rdma-core "glue"
- plug-in which must either be installed in a directory whose name is based
- on ``CONFIG_RTE_EAL_PMD_PATH`` suffixed with ``-glue`` if set, or in a
- standard location for the dynamic linker (e.g. ``/lib``) if left to the
- default empty string (``""``).
-
- This option has no performance impact.
-
-- ``CONFIG_RTE_IBVERBS_LINK_STATIC`` (default **n**)
-
- Embed static flavor of the dependencies **libibverbs** and **libmlx5**
+- ``static``: Embed static flavor of the dependencies libibverbs and libmlx4
in the PMD shared library or the executable static binary.
-- ``CONFIG_RTE_LIBRTE_MLX5_DEBUG`` (default **n**)
-
- Toggle debugging code and stricter compilation flags. Enabling this option
- adds additional run-time checks and debugging messages at the cost of
- lower performance.
-
-.. note::
-
- For BlueField, target should be set to ``arm64-bluefield-linux-gcc``. This
- will enable ``CONFIG_RTE_LIBRTE_MLX5_PMD`` and set ``RTE_CACHE_LINE_SIZE`` to
- 64. Default armv8a configuration of make build and meson build set it to 128
- then brings performance degradation.
-
-This option is available in meson:
-
-- ``ibverbs_link`` can be ``static``, ``shared``, or ``dlopen``.
-
Environment variables
~~~~~~~~~~~~~~~~~~~~~
A list of directories in which to search for the rdma-core "glue" plug-in,
separated by colons or semi-colons.
- Only matters when compiled with ``CONFIG_RTE_IBVERBS_LINK_DLOPEN``
- enabled and most useful when ``CONFIG_RTE_EAL_PMD_PATH`` is also set,
- since ``LD_LIBRARY_PATH`` has no effect in this case.
-
- ``MLX5_SHUT_UP_BF``
Configures HW Tx doorbell register as IO-mapped.
.. _`Linux installation documentation`: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/plain/Documentation/admin-guide/README.rst
.. _`RDMA Core installation documentation`: https://raw.githubusercontent.com/linux-rdma/rdma-core/master/README.md
-If rdma-core libraries are built but not installed, DPDK makefile can link them,
-thanks to these environment variables:
-
- - ``EXTRA_CFLAGS=-I/path/to/rdma-core/build/include``
- - ``EXTRA_LDFLAGS=-L/path/to/rdma-core/build/lib``
- - ``PKG_CONFIG_PATH=/path/to/rdma-core/build/lib/pkgconfig``
Mellanox OFED/EN
^^^^^^^^^^^^^^^^
git.droids-corp.org / dpdk.git / blobdiff